Non-parametric regression models (e.g. kernel smoothing techniques, support vector regression model) have been widely used in statistics and recently in econometrics and engineering as well. Regression functions can be effective tools in the solution of engineering optimization problems. In the investigation of complex technical systems the class of the function describing the connection between the input and output data is generally unknown, moreover the “classical” least square fitting method is not flexible enough to provide an effective regression function in the case of higher dimensional optimization problems. In this paper regression functions obtained in different models are compared graphically in one dimensional case. Calculations were made using Maple, R, and MS Excel software.

The applicability area of the SPA and SPZ V- belt transmissions is referring on the transmissions which are loaded with small and medium loads and on the transmissions where the accuracy is not an important parameter. Due to design calculus, there are many variants in order to choose the design parameters; the aim is to obtain small distances between the V-belts wheels axes and a small number of belts. An important problem is represented by the cases when the designer, according to the design data, may choose both variants of the V-belts: SPA or SPZ. The paper presents the influence of the V-belts type on the axis distance and belts number values. A finite element analysis is made in order to find out which variants of belts – SPA or SPZ – are reliable to be chosen, according to the equivalent stresses.

The chain drives are used in agricultural machines, one person transport vehicles and the distributions mechanisms of the cars. Due to the wear, tensions systems are used; in the case of fast transmissions are used skate tensioning systems. The paper presents the analysis of the mechanical phenomena in the contact area between the chain and the skate; first is presented the contact calculus and then, is presented the FEM analysis by using ANSYS in order to identify all the mechanical variables. There are presented the main design parameters and their influence on the stresses in the contact area.

Generally product lifecycle management (PLM) is characterized as an integrated management process of product information and related processes across the product lifecycle. PLM affects development time of product and optimize the cooperation of all components of the development process of products. Therefore attention has to be paid to this fact in production and research. Currently, still only a few small and medium-sized enterprises (SMEs) uses real benefits that PLM offers. It is caused by several factors that may have information, technical and financial character. Purpose of this article is aimed to refer to the problems mentioned above and highlight the benefits that PLM brings. It also describes the major barriers to the implementation of PLM in SME and propose possible solutions.

The paper introduces the analytically planar compliance model of circular-axis symmetric notch flexure hinges that can be used as flexible connectors in compliant mechanisms. The circular-axis flexure design adds an extra parameter, the median circle radius, to the regular straight-axis flexure design domain. Six general compliances are derived with respect to an end reference frame in terms of only three compliances of half the flexure hinge. Two new circular-axis configurations are studied, namely: the right circular flexure and the right circularly corner-filleted flexure hinge. The analytically compliance model predictions of the two designs are confirmed by finite element simulation and experimental tests.

The present paper aims to present some aspects of efficient production systems organization and management, especially in the Romanian automotive industry, which came as a response to the reported demand volatility influences, being emphasized some aspects related to an increased short-term flexibility of the production units. The presented case study highlights the possibility of human resources reallocation within the organization, changing from 3 shifts to 4, and analyzing the influences generated by these changes. Identified comparative differences were evaluated in terms of operator efficiency and used machine effectiveness, resulting quite similar values, also proposing a human resources allocation scheme on a variable number of machines. Proposed schemes limitations are given by the need of additional qualified workforce and the establishment of homogeneous working groups. Future research may demonstrate the appropriateness of preparing such an approach in terms of involved costs and further industrial units development possibilities.

The aims of the Cost-optimum work group in the DEnzero project at University of Debrecen Faculty of Engineering is to make an economic analysis of energy efficient investments, to examine the macroeconomic effects of renewable energy investments and to develop software for evaluation of the energy efficient measures (building construction, renovation of existing building). The first step in the research is to overview the current European and national laws, regulations and guidelines. In this paper we summarize the most important aspects of legal framework established by the European Commission on energy efficient investments such as determination of global cost and the concept and the role of reference buildings.

The paper presents the dynamical analysis in the case when sudden kinematics parameters are applied upon one element of gimbals. Two cases are considered: first, when the rotor of the gimbals is dynamically balanced and the second one, when this condition is not satisfied. The dynamic simulation was made using specialized software based on multi-body dynamics method. An accurate characterization of impact force versus time using specialized software requires refined meshing of the sampling interval and numerical modelling of a shock phenomenon arises as a intricate project. To avoid this aspect, the shocks were applied to the system by step variation of kinetically driving parameters. The step function was modeled using a third degree polynomial. The balanced rotor has a smoother dynamical behavior than the unbalanced one.

The paper aims to present the major tool monitoring techniques used in manufacturing industry. Tool monitoring in the actual competitive market is of significant importance in maintaining a cost effective production and obtaining the required quality of the finished product. The paper will also analyze the integration of tool monitoring techniques from the perspective of implementing the ATR (Automated Tool Readjustment) for the TMA 55 Al flexible manufacturing cell at the University of Oradea, Mechatronics Department.

This paper presents the main characteristics of a harmonic oscillator and the phenomenon of propagation of oscillations in an elastic medium, as a wave, then establishes connection between the oscillation emitted by the emitter and the oscillation received by the receiver under the conditions of a relative emitter – elastic medium – receiver movement.

Developing an innovative business idea and implementing it, along with risk taking, generally defines the concept of entrepreneurship. Entrepreneurship has a constantly expanding classification, which includes, among others, young entrepreneurship, social entrepreneurship, green entrepreneurship (ecopreneurship) and technological entrepreneurship. Within this context, the paper aims to present a conceptual model based on the relationships between four classes of influence factors, namely characteristics of the (potential) entrepreneur, the environment, the technology and the involved resources needed for the implementation of the business idea. The business idea comes from an extended domain, namely technological ecopreneurship. The proposed research methodology is based on a quantitative approach, namely a questionnaire based survey using a non-probabilistic sampling method due to current research limitations. It will be analyzed to what extent, as perceived by the respondents, the success of a business idea depends on each factor.

This paper is intended to be an applied research concerning the workload in the automotive industry companies in Romania. The managing staff from these organizations believes of utmost importance aspects regarding both the efficient allocation of existing human resources, and those related to the productivity of operators. To highlight these issues, the work process from a workstation within a production line was analyzed, and the results of three different operators were compared. In the first stage of the research, the timing of the operations was performed and the causes and issues that cause downtime were identified. At the same time, an analysis was carried out based on the model BasicMOST; based on this analysis, work procedures were highlighted, which lead to the possibility of obtaining high productivity.

The paper presents some aspects concerning the function of the acceleration sensors from impacting systems. On an existing device, a new acceleration sensor was mounted instead of a shock sensor, from economy reasons, and then tests were performed. Using a ballistic pendulum, composed from a prismatic body with two steel balls attached to the ends, a planar motion was obtained by the suspending method. The prismatic body has attached the acceleration sensor, the sensor signal generated by the sensor and the characteristic signal for time period during which the active part of the pendulum collides different bodies are compared using a memory oscilloscope. From the experimental tests it was concluded and validated by literature that the acceleration values from impact phenomena are considerable greater than the working range of the acceleration sensor. Thus, the use of acceleration sensor in the study of impact phenomena is inappropriate because can lead to erroneous values and conclusions.

This paper presents a comparative study on braze-welding of aluminum with galvanized carbon steel using CMT (cold metal transfer) and CMTP (cold metal transfer pulse) methods. The aim is to determine the influence of linear energy on diffused zinc layer thickness in aluminum. This paper presents a two-level factorial experiment (given by transfer types) having the welding current and welding speed as parameters. Finally we determined the influence of linear energy on the thickness of the diffusion of zinc.

The present paper aims to emphasize the issues that are related to Lean Manufacturing system, a method of production organization, and specific for a flexible production system, in this fast response to client demands era. This represents the guarantee for a performance enterprise. The main concepts are presented, the application of these principles, which can be adapted in specific ways and in different contexts, both in industry and in services, as well. It aims to generate a change at the workstation level, to eliminate defects, and to increase the efficiency and ergonomics. By this approach, were presented aspect related to the organization of the production process, and how the production line can be improved by reconsidering the production flow and recalculation the number of operators required to achieve customer order.

The productivity of an injection molding machine is the quantity of parts made in unity of time on a particular model of mold. The quantity of injected parts in unit time is directly proportional with the injection cycle time. The cycle time is composed of filling time, opening-ejection- closing time, cooling time inside the mold. Of these three time, the first two are constant values. Filling time depends by the rheological properties of thermoplastics, and the opening- ejection-closing time depends by mechanical characteristics of the injection molding machine. Cooling time is variable and is determined by the shrinkage of injected molded piece, or deviation from nominal dimension. Low value of shrinkage cause a higher quality of injection parts, but lower values for productivity.

The objective of this paper is to present the methodology to be followed for more accurate simulation of a kinematics system using Shark program. By introducing kinematics parameters we can improve the comportment of the vehicle and the way he respond to the combined stress taken from the road. In the second part, these kinematics conditions will be combined to generate a complex kinematics system. In our case we use kinematics conditions to simulate complex systems of vehicle chassis assemblies.

This paper presents the research regarding knives used for tooting spiral bevel gears. The mathematical model employed in the research uses the space meshing method as its study method, having customized it for the technological gear formed at the rectification of the seating surfaces. The deviations of the cutting edge from a straight line that passes through its extreme points are determined using computer simulation. These deviations are assessed in different sections of the cutting tool’s resharpening field. The proposed solution for the side and peak surface coincidental grinding is based on a key property of cylindrical helicoids of constant pace which states that the common screw axis is affine-invariant to the rototranslation of either helicoid. The exploitation of this property for achieving active helical edges ensures the conservation of the shape of the cutting tool’s edges, and consequently of its profile. The results obtained with these cutting tools in the processing of the gear are being presented.

The paper elaborates a mathematical model with a view to carrying out a study into the dynamics of wheeled tractors during braking. The braking dynamics is analyzed by considering two versions for the braking system: 1) braking applied on the rear axle and 2) braking applied on all four wheels. The mathematical model enables us to graphically illustrate the evolution of the following parameters: braking deceleration, braking speed and the distance traveled by the tractor during braking. The mathematical model elaborated is applied on a 4x4 tractor with engine power of 58 kW.

In this paper we analyze laminate composite materials by numerical methods. Stiffness and strength is the basic concept for underlying the mechanics of fiber-reinforced advanced composite materials. We write a Matlab program that assists the user to find out the stiffness matrix of a laminate composite. The main objective of the paper is to show the advantages and ease use of Matlab software in composite materials analysis. To demonstrate the capability of the program an numerical example was presented.

– The current paper intends to present a study on the influence of the testing temperature and the strain rate on the behaviour of Polyamide 6.6 fibres used for the manufacturing of woven fabrics for airbags, during uniaxial tension tests. For this study, Polyamide fibres were tested at three different strain rates: 10 (mm/min), 100 (mm/min) and 200 (mm/min) and at three different temperatures: -40 (0C), 20 (0C) and 100 (0C).

Industrial Ecology is a new field of research, which covers the physical, chemical and biological interactions and interrelations both within the industrial systems and between the ecological and industrial systems. The implementation of an IE framework embeds the strategy of clean production and pollution prevention in industrial activities, at corporate level. Such policies must emphasize the activities of waste minimization, recycling, pollution control, reusing, at operational level. The exchange of 'wastes' between independent firms in some sectors has been taking place for over a century, simply because it makes good business sense. The establishment of 'industrial ecosystems’, however, is a relatively new phenomenon. The paper presents the theoretical background of industrial symbiosis and practical examples of this new paradigm.

In these days, due to challenges resulted from global competition, customer churn represents one of the significant concerns for companies in different industries. With a churn rate of 30%, the telecommunication sector takes the first place on the list. In order to solve this problem, predictive models need to be implemented to identify customers who are at risk of churning. In this paper, an advanced methodology for predicting customers churn in mobile telecommunications industry is presented. The data-set used, contains call details records and has 21 attributes for each of its 3333 records. We use a Support Vector Machines algorithm with four kernel functions to implement the predictive models. The performance of the models is evaluated and compared using gain measure.

The present paper completes a previous paper in which were determined the positions, velocities and accelerations of a jointed quadrilateral mechanism with the aid of some certain AutoLisp functions. The completion consists in the realization of two AutoLisp functions which determine the reactions in the RRR dyad, at the active element and the animation of the vector polygonals or the animation of a wished reaction. The AutoLisp functions are easy to write, the relation that stay at the base of the thinking are vector relations used in the graph-analytical analysis. In the end are shown, as diagrams, the obtained numerical results.

The problem of machining and measuring conical surfaces with great accuracy is a challenging current subject in engineering. Cutting edge methods which measure the conicity and form errors of manufactured conical parts are accurate but involve high-costs equipments. New, accurate, practical and economical measuring instruments should be developed and to this end, the paper proposes some simple yet precise measuring devices. The paper presents the geometrical elements concerning a conical fitting that may be useful in designing and manufacturing diverse external taper measurements devices. The basic principles to be considered are determined and the minimum essential notions in designing the devices are presented. The calibrated rings method is considered and mechanical or digital calipers will be used in developing the devices.

In the paper we present the analysis of the continuing education forms to the employees in the budgetary system, in Romania. The objectives of the analysis are: - the evaluation of the general current situation of the need for learning (cause-effect problem tree); - the determination of the continuing education forms role in Romania; - suggestions and recommendations for the employees in the budgetary system to access the continuing education forms. the individualized development plan. After we investigated the continuing education forms to the employees from the budgetary system we found the following trends: - the continuing education is very necessary in any form of education; - decreases the number of the employees in the budgetary system because of the staff reorganization; - all the education forms have an important role in the continuing education for the employees in the budgetary system participate especially to the courses financed from European funds.

This is the second paper in a series intended to highlight the present possibilities offered by the evolutionary computing techniques for structural optimization. In this second part, the two most prominent methods, the genetic algorithm and the particle swarm optimization, are discussed in detail. We will present their classical formulation, main aspects, implementation details, newly proposed enhancements, advantages and drawbacks. The final section also lists available implementations of these algorithms which can be used to develop original computer programs to test improvements of these methods.

In this work, starting from Microsoft Excel documents we developed a crawler module and we designed a relational database that supports time analysis of defects cars. By highlighting common patterns present in car service and parts production failure, and through their intelligent analysis may result important information regarding to cars' reliability and maintainability. Experimental research was to study the behavior in operating a well-determined period of time of Opel cars and data collection from invoice services documents. With the help of this software application it can gather huge history information from any car service indexing files system and, through further investigations, the manager obtains an extremely agile understanding of the common malfunctions that a car system can suffer and even point out to parts producer, patterns that appear in their design.

The paper presents the study of tribological contacts between the guide and the links for the main types of chains used in timing mechanism of the combustion engines. In this regard it identifies the geometry defining the contact between guide and the common types of chains. In order to determine the pressure distribution in the contact area guide/links, the methodology of solving the Reynolds equation is proposed for general contacts of this type. The mathematical modeling and numerical solution of Reynolds equation are presented for a specific optimization problem.

A binary blend Acrylonitrile Butadiene Styrene – High Impact Polystyrene (ABS-HIPS 50% wt) was prepared on a twin-screw extruder at 190-210 ºC. The different properties were then analyzed using melt flow index (MFI), thermogravimetric analysis (TGA), and Fourier Transform Infrared spectroscopy (FTIR). FTIR analysis indicated heterogeneous distribution of the blend in injected pieces and SEM micrographs show heterogeneous distribution of both phase (ABS and HIPS). On the other hand, we have prepared ternary blends of ABS-HIPS-Styrene Ethylene Butylene Styrene (SEBS), varying the percentage of SEBS from 10 to 30 %wt using a twin screw extruder at 190-210ºC. The addition of SEBS to the binary system (ABS-HIPS) allowed us to increase the ductile properties as well as reducing the viscosity.

Incremental sheet metal forming is a relatively new forming process that can provide a cheap way to manufacture sheet metal parts without the need of expensive dies. The goal of this research is to determine if an asymmetric incremental sheet metal forming process can be executed by means of a KUKA industrial robot. The most important aspects that have been taken into account regarding the incremental forming process done by means of an industrial robot were the forces variation, thickness reduction and the major principle strain variation. The first step in order to determine these factors was to obtain the stress-strain curve for the steel sheet used for the experimental parts. Once the stress-strain curve is obtained, a numerical simulation of the incremental sheet metal process can be performed by means of LS-Dyna software.

The 4R spherical quadrilateral mechanism, where by R is notated the rotation cinematic couple, from which is obtained the cardan mechanism, is of third family , as consequence, triple static undetermined and for calculating the reactions from the cinematic couples it is applied the elastic linear calculation using the relative displacements method noted in plukerian coordinates. By using this method and numerical calculation, allows one to determine the reactions from the cinematic couples, as the method can be applied to different types of spatial or plane mechanisms. The calculation algorithm established in this paper and the program that was made, allows the user to determine the influence of mechanical and geometrical characteristics each element of the spherical 4R mechanism over the reactions from its cinematic couples. The results of the numerical solving of this problem will be presented under the form of a diagram and will be commented.

— A binary blend Acrylonitrile Butadiene Styrene – High Impact Polystyrene (ABS-HIPS 50% wt) was prepared on a twin-screw extruder at 190-210 ºC. The different mechanical properties were then analyzed using tensile strength and impact tests. The analysis of mechanical properties showed a decrease in elongation at break and impact strength. On the other hand, we have prepared ternary blends of ABS-HIPS- Styrene Ethylene Butylene Styrene (SEBS), varying the percentage of SEBS from 10 to 30 %wt using a twin screw extruder at 190-210ºC. The addition of SEBS to the binary system (ABS-HIPS) allowed us to increase the ductile properties (elongation at break and impact strength).

In the long term management of the maintenance of the equipments an indicator called “Life Cycle Cost” is used. It has a few features depending on the application field. This paper presents a few management methods of the equipments maintenance on the basis of the optimization of some cost categories.

Road safety represents an important objective of the national policies in the European Union (EU) state members. A basic, but very important step in achieving this objective is the accuracy, rapidity and efficiency of the crash data collection systems. This paper proposes a modern system for collecting data from crash sites and presents the steps taken to achieve this system. The advantages of the presented system are notable: rapidity and precision in collecting data significant to elucidate the circumstances and probable causes of the accident, fast and accurate transfer of data from site to a centralized database, facilitated statistical analyses and data comparisons.

The paper presents a methodology for determining the dynamic characteristics fiberglass reinforced epoxy resin rods recovered from used composite electrical insulators. These are important for studying the dynamic stability and mechanical resistance under the action of external disturbing factors. There is presented the required measuring equipment and the rod mounting system for measurement. Experimental modal analysis (EMA) is used; the modal shapes are geometric representations of the dominant structure movements at proper frequencies. Identifying the proper oscillations is important for the given structure, resonance displacements indicating material wear and fissures in the framework. Research has identified the frequency response functions (FRF) and from their analysis it was determined the resonance frequency based on which can be determined the modal parameters of the analyzed rod.

In this article, theoretical aspects of motivation and performance concepts and processes are covered. The paper aims to provide a research framework regarding the influence of motivation on human resources performance. In this regard, we applied Herzberg’s two factor theory, selecting the motivational factors which influence the activity of employees from industrial firms. Considering the aim of the research, the paper proceeds to analyze the influence of prevalent motivational factors on employees’ work performance. Within this view, there were selected representative performance criteria in order to develop an integrated research framework regarding the factors which motivate employees working in industrial companies to improve their work activities and the overall company performance. The result will represent the basis for further quantitative research analyzing the relationship between employees’ motivation and improvement of performance of their work activities.

This paper highlights the experimental research of the author regarding the implementation of spiral bevel gears with curved teeth, teeth which have a decreasing depth of the tooth. The subject of this paper is the process of toothing a gear with the use of cutting tools designed and made by the author. The knives have the side and peak edges generated according to an involute spiral. The proposed solution for the side and peak surface coincidental grinding is based on a key property of cylindrical helicoids of constant pace which states that the common screw axis is affine-invariant to the rototranslation of either helicoid. The exploitation of this property for achieving active helical edges ensures the conservation of the shape of the cutting tool’s edges, and consequently of its profile. The results obtained with these cutting tools in the processing of the gear are being presented.

—The wire rope insulators (WRI) represent efficient solutions for vibration and shock attenuation which can appear in equipment and installations exploitation. Choosing the WRI model which corresponds a certain application is the main objective for the researchers. The aim of this paper is to present the influences of the wire rope length in vibration isolation. Measurements performed with 3 different WRI models offer information on their vibration behavior depending on their length. The obtained results are useful in choosing WRI insulators for vibration attenuation applications.

Structural optimization requires a large number of structures to be evaluated. In simultaneous size and shape optimization, where only meta-heuristics techniques can be used, the number of evaluations can easily ran into thousands. Renowned and widespread commercial software like ANSYS or MSC Nastran are multipurpose FEM (Finite Element Method) programs have high initialization times which are even higher than the computing ones. This has a vital influence on the algorithm performance, especially in population based meta-heuristic techniques. In order to avoid this issue, lighter FEM software or even embedded FEM code should be used. Among the Openware FEM code, the software FEM3DD can be highlighted. From its features, it is worthy to stand out: fast initialization, multi-OS open source code (GNU license), command line operation, CSV and Matlab files reading, and well documented.

In the paper are presented six AutoLisp functions by the aid of which one realizes the kinematic analysis of a jointed quadrilateral. The kinematic analysis bases on graph- analytically methods, the showed AutoLisp functions determining the velocities and accelerations of mechanism’s points and elements, with no geometrical construction. This thing performs a great connection between the intuitive graphic methods and the vector work procedures of the CAD soft. As an application, is used a Chebyshev mechanism. By the aid of the described functions we obtain the 360 layers which have the name of crank angle: positions, velocities and accelerations of the elements. In a separate layer we get the curve described by a point of mechanism’s shaft. The animations of the mechanism and also of the velocities and accelerations polygonals give thus a qualitative appreciation of the mechanism and its functionality too.

In this paper is presented a new method that uses a polar coordinate system to determine the vehicles deformation magnitude. The laser profilometer method is distinguished by the small size of the equipment used, the simplicity of the measuring methodology, data acquisition and processing and high accuracy of the results.

This paper presents a comparative study done at an interval of one year, on the carbon monoxide emissions from motor vehicles in circulation on the main roads which were reconfigured, in Sibiu

Nowadays it becomes more and more difficult to prevent malicious attacks as pieces of information are confidential and therefore stakeholders cannot be informed properly in order to react in real time. The present study presents the threat analysis framework as a suitable model to use in this situation as it allows you to quantify threats and develop means that makes possible transformation from classified into non-classified information and their communication. The authors took into consideration three different types of critical infrastructures to verify if the threat analysis framework represents a suitable model or not.

Gear transmissions are frequently used in PV tracking system because of the possibility to realize very large angular movements. The paper presents a new straight bevel gear system for large dimension photo voltaic (PV) platforms. The PV tracking movement’s errors depending by straight bevel gearing errors and also by the tracking elements deflections. The design accuracy of straight bevel gear is influencing the load transmission, the size and gear weight and also the system performances. The paper analyses the influence of the geometry of straight bevel gears on the combined geometry factor for the pinion and also the wheel of a straight bevel gear from a tracking system transmission, for static load.

Mechanically speaking (statically), the 4R spherical quadrilateral mechanism is statically undetermined, and for calculating the reactions from the cinematic couples and those influence over the efforts from the mechanism elements ,it is applied the elastic linear calculation using the relative displacements method noted in plukerian coordinates. In the present paper there will be established the calculation relations that can determine the elasticity influence of every section over efforts from this mechanism.

Product and process optimization is a special field of interest in modern engineering. A particularly interesting subject, with great implications on the time and cost of the design and manufacturing of products is the structural design optimization. Traditionally employed by mathematical optimization procedures, modern approaches propose daring and original techniques based on natural processes and phenomena. The current paper presents the types of optimization usually employed in structural problems and an overview of the evolutionary computing paradigm, with its two main branches: evolutionary algorithms and swarm intelligence.

Nowadays it becomes more and more difficult to prevent malicious attacks as pieces of information are confidential and therefore stakeholders cannot be informed properly in order to react in real time. The present study presents the threat analysis framework as a suitable model to use in this situation as it allows you to quantify threats and develop means that makes possible transformation from classified into non-classified information and their communication. The authors took into consideration three different types of critical infrastructures to verify if the threat analysis framework represents a suitable model or not.

The cause of vibration, their harmful effects and remedies have also been mentioned for practical utility to control vibrations. A system which has mass and elasticity can start vibrating if it is disturbed. The natural frequencies of a system depend on the degrees of freedom of a system. For a multi-degree of freedom system, there will be several natural frequencies. Mechanical vibration in machines and equipment can occur due to many factors, such as unbalanced inertia; bearing failures in rotating systems.

The human tissue is a regular interconnected pore structure. Mechanical material properties and hydro gel lubrication characteristic can bring implant structures closer to the form that we can find in natural cartilage. Laser is used in a wide variety of materials to fabricate complicate 3D structures and that is way they have chosen it for closer analysis. In our days there are more and more bio-materials discovered and in use for the long term implant to substitute damaged tissues. In this paper some of the widely used synthetic implant materials and laser based fabrication methods are featured; why they would be ideal for this cartilage implant and for this laser based manufacturing method.

The physical phenomena taking place in the arc column during various processes of MAG and MIG welding depend on both the welding conditions and the electrical parameters of the power source – arc system. This paper presents some results of the experimental studies on the stability of power source – arc system under controlled, artificially simulated disturbances of a welding process, similar to such, that might have occurred under real welding conditions. An advanced method of registration of such data as the pictures of the metal transfer modes across the arc column with the use of high-speed camera synchronized with the current and voltage wave forms in the welding circuit has been applied during the course of experiments. Basic technical details of the advanced method of data acquisition as well as the analysis of obtained results are also presented.

This article attempts to define the engineering, purchasing process, and release engineering process affect the quality of service. The article discusses the need for purchasing engineering and check your expectations and creates the technologies used to build the level of quality. Proposed selection criteria as factors engineering, and shows the duality in terms of external and internal influence on the perception of the level of quality. Gear ratio engineering processes for purchasing process engineering makes it possible to search for appropriate technical means to shape the quality of services and also makes the possibility to find a quantifiable method of assessing the effectiveness of the criteria used in.

Small and medium-sized enterprises (SMEs) play an essential role in the European economy. They represent a source of entrepreneurial skills, innovation, and new jobs creation. Even if they recognize the importance of human factor in obtaining performances as the organizational level (especially during crises) relatively few managers from large organization, and even less from SMEs which do not have a specialized department in human resource problems are willing to give the necessary attention to the implementation of a performance management system. The paper presents the results of a study regarding the level the Romanian SMEs use the performance management tools and techniques in there activity.

—In the 90s of the twentieth century or even the beginning of the twenty-first century competition between candidates for employees in the logistics industry in Poland was very sensible and logistics beginning his career were much easier to enter the labor market. Now the situation is different. First, in the minds of young people's awareness of the complexity of the logistics process and the challenges they bring for them is much higher. Logistics is an interdisciplinary profession. Second, the course of study, which is the logistics, it is now one of the most popular fields of study in Poland. This is evidenced by the fact that almost every university with backgrounds in economics and management, specializing in logistics is on offer. Another issue is the quality of education. It is not difficult to receive permission from the ministry to launch a direction far more difficult to have a qualified team of logistics. It's not about the manager, which as a result of the reclassification of "learned" logistics in a year or two years, participating in some courses or reading literature. It is about the manager, which in addition to a broad theoretical knowledge, it also has a practical orientation, as in the case of logistics, it is very important. It guarantees that future logistics will be well prepared, and the labor market in the logistics industry today places great demands. The purpose of this article is to identify which competencies should have logistics managers, looking at the needs of today's labor market, and to confront it with the powers that were identified during the research staff of the logistics industry.

The paper presents a study of machining errors via empirical statistical method. A batch of 243 cylinder bearing roller parts was used, with the diameter as measured feature. There are revised the main theoretical aspects concerning technical measurements and the study of machining errors using the empirical statistical method. Three measuring methods and equipment are used: orthotest, analogical system and digital micrometer connected to a specialized statistic printer. A few conclusions arise and a series of issues to be further achieved are revealed.

The paper presents the evolution of some indicators regarding the evolution of some indicators in high – tech companies also in Romania as well as in the European Union. The indicators take into consideration refers to total expenses of the companies that activates in this field as well as the evolution of the personnel which works in high – tech technology companies. It is presented also the high-tech technology exports also in Romania and in the European Union. The paper also wants to present a prediction of those indicators for the next three years. In the same time the paper contain a correlation between the whole expenses of the high – tech technology companies and the number of employees also in Romania as well as in the European Union.

The city of Brasov is in constant transformation since 2007. Several intersections have been structurally modified. Also in 2009 the city beltway was put into use and the traffic composition was changed. This paper aims to analyze the level of noise pollution according to the geometrical parameters of intersections. This study is a comparison between the values of the road traffic noise registered for one intersection, in three different periods. Analyzing the registered values can be said that the main contributor to noise pollution was not the geometrical parameters (transforming the traffic lights intersection into a roundabout). However, the main contributor to noise pollution is the traffic composition. Transforming the traffic lights intersections in roundabouts has little effect over the noise pollution in urban areas.

The modular design imposes finding the optimal solutions from constructive and functional point of view. The constructive design must be correlated with the technological one. Thus, it is possible to obtain mechanical components with reduce building limit and weight, with high durability and small price.This paper presents a new type of clutch named “Elastic and Safety Clutch” that can accomplish the functions of the elastic and those of the safety clutches, but it is not a combined clutch. The proposed clutch is an elastic and safety clutch with metallic intermediate elements. The paper presents the analytic modeling of the torsion moment in case of the elastic and safety clutches with degenerated followers into lamelar bows that are equal-angular disposed.

This paper aims to present an overview of the business ecosystem and it will describe the evolution of this concept. Also there are highlighted the most representative existing conceptual models for different ecosystems and the most important business ecosystem’s features. This literature analysis led to creation of conceptual model of the complex business ecosystem. Based on a case study, this paper is illustrating the implementation of this model in organisations.

This work paper refers to a specific type of machines functioning known as granular materials separator, which are using vibratory motion for their working elements (sieves). An efficient vibratory motion for this type of machines produces a process of self-sorting for granules of different masses and sizes in the nearby surface of the sieve. Therefore mechanical systems of separating machines are using an adequate supporting system and a specified generative force system in order to produce a certain trajectory for the center of mass of the working element (Lissajous elliptic type curves). For this not only stiffness constants (influenced by material characteristics and shape) of supporting elements but also damping constants is a very important factor that influence motion.

Paper presents some aspects regarding the problem of Intellectual Property (IP) in universities, or Research and Development (R&D) Institutes in the way to promote and to protect the innovative results or products. It is very known that China, but not as single example, realized immediately all new products and they are staying to find products without international protection. In this way paper presents a methodology to stimulate the innovative process and the law protection of Intellectual Propriety Rights (IPR). This opportunity was drafted after the discussions held during the roving workshops “Disseminating IP Knowledge at Universities”, in Bucharest (2007), Den Hague (2008), Iaşi (2009) or Brussels (2011), and after discussions and the methodology established in Technical Committee (CT) 383 “Management of Innovation”, Romanian Association for Standardization, (ASRO), Romania in 2012.

The CAD / CAM integrated systems experienced a significant development in recent years, creating a close connection between the two adjacent areas: constructive design side - CAD (Computer Aided Design) and technological design side - CAM (Computer Aided Manufacturing). To make a virtual prototype, the CAD module generates models of the processed objects and generates processing and manufacturing related information required for the CAM unit.

The paper is based on the previous author research with the aim of research and implementation in services fields of washing-cleaning of operational robots systems, used at exterior frontage of buildings that are realized from modular glass panels. The climbing constructive variant of robot is more used in cleaning-washing services or periodical inspection of frontage buildings with glass walls can be realized and applied with success in these operations to smart buildings. The system is composed from mechanical system with light structure, power system formed by pneumatic-vacuum system, and command-moving in conformity with predictable software. The flexible processing system proposed and presented by the authors, a system composed from a work device and a transfer device.

In this paper it is presented the structural scheme and analytical background of a hydrothermal micro-carrier of heat and mass, horizontal, opened, by thermo-aeration. This system transfers heat and mass with fluid flow rate conserving and can be implemented on the cooling system of internal combustion engines. The fluid has natural circulation, but in case when that solution is short of satisfactory, it can be insert a forced cooling with a pump or with an air blower. As an application it is analyzed the cooling system of an engine with natural circulation by thermo-aeration.

The groundwork of intellectual capital (IC) management, evaluation IC, attracts much attention from academics and practitioners. Today the intellectual capital is a key factor in company’s profitability and has become the preeminent resource for creating economic wealth. In this environment, the intellectual capital and intangible assets is fundamental to success. In the new economic competition, intellectual capital provides a sustainable competitive advantage. The evaluation is fundamental to support management decision in allocation investment and investor’s decision regarding the value versus price. The purpose of this paper is to presents an analysis for the generic model to explain the genesis of the multidimensional concept of intellectual capital and an empirical study in a company. Given the recent proliferation of IC evaluation models, it is necessary to classify it according to criteria that are linked with their practical exploitation and use.

Effective cost reduction of manufacture structures can be achieved by applying mathematical methods of optimal design. This article presents the determination of optimal geometrical sizes of three-layer sandwich beams with profile. It reviews the formulation and design constraints of the objective function. The objective function includes the manufacturing costs, while the design constrains refer to the maximal normal and shear stresses, the maximal deflection, damping of vibration and geometrical sizes. It examines the changes of the optimal geometrical sizes and that of the minimum objective function as a function of loading.

The resistance structure of the modern car is designed so that it could absorb the impact energy through controlled deformation. This goal is necessary in order to reduce not only the shock effects on occupants but also the injuries suffered by them in accidents. The deformation manners of the structure, axial compression, bending or combined, determine the amount of energy that can be dissipated by the structural elements. The efforts of car makers consist in obtaining axial compression deformation behavior, which is the maximum mode to absorb the impact energy.

The paper presents the solution for the feed mechanisms of the rotary-tilting table with a 250 mm diameter that is used in the 5-axis machining centers. Rotary-tilting table are equipped with synchronous worm gears duplex, timing belts get moving through the actuator drive. Gear ratios of duplex worm gears are 1:40, and timing belts transmission gear ratios is 1:1. For tension timing belts are use the eccentric tensions. Tilting movement servomotor is located on the motherboard of the rotary-tilting table and feed rotary servomotor is located in the tilting axis. The result is a table with small footprint, low cost, without diminishing performance.

The issue of sustainable development is increasingly present among the concerns of the international academic community. The role that universities have in modeling the future generations towards sustainable societies is no longer questionable. This paper presents the importance of knowledge sharing between universities and academic staff and highlights the role of education for shaping a more sustainable society. The paper also introduces an info platform, based on Web 2.0 technologies, designed to help academics to collaborate and share best practices related to sustainability education. The proposed platform provides not only a framework for academic collaboration but also a support for lecturers who wish to engage in the process of transition towards a more sustainable society.

Article describes the method of objective evaluation industrial robot quality, where is necessary to quantify chosen parameters, mathematically describes dependencies between physical values and express their value in non dimensional form. Presented theory of functional similarity was applied for comparison of three industrial robots construction. New method proposes more objective criterion of quality in comparison of physical similarity and is more general, because it does not demand geometrical similarity.

Grinding process is increasingly used in surface finishing of materials that are hard to process using other methods, such as hard alloys of nickel, titanium, hardened steels, ceramics, carbides. The performance of grinding process is conditioned by a number of factors related to the characteristics of the work-piece, grinding wheel and its properties, cutting mode, cutting forces, heat output, etc. This paper aims to make a model of the grinding process of carbide drills for deep holes of small diameter. Carbides raise a number of problems in grinding. This has been the subject of many research studies. In addition, the carbide drill for deep holes of small diameter requires increased dimensional accuracy, a surface with low roughness, and no physical or chemical altered surfaces during processing. The model developed contains the necessary elements of an efficient grinding process for this type of drills.

This paper presents a finite-difference computational method, which describes the plane state of stress of the orthotropic materials. By using a function of the displacement potential, the determination of boundary condition as load for the vertical side on the left is exemplified. The convex corner case is treated separately, when the corner displacement is free and when it is prevented or prescribed. When displacement is imposed in both directions, we analyze the situation in which only one side is leaning, and when both sides are embedded. Depending on the number of points inside, on the sides and the number of convex and concave corners, the number of points on the imaginary boundary and inside the domain under analysis can be established.

In the context of striving demands for sustainability actions, education came to play an important role. This role has been recognized and emphasized by the United Nations, when it proclaimed the Decade of Education for Sustainable Development (DESD), 2005-2014. Since the beginning of this decade, universities have done a frenetic work to encompass sustainability principles in their core culture. To face this challenge it was important to understand what makes the difference between a traditional university and a sustainable one. Starting from the literature review, this paper offers a conceptual framework for the future development of sustainability in universities. The sustainable development concept will be presented, emphasizing the role of sustainability and outlining those core activities which should be relevant to any university, especially to the engineering one, in its way to respond to pressure of change rising from sustainability demands.

Nowadays, the energy efficiency solutions, renewable energy usage are very important topics because of the rapid decrease of the energy sources. Department of Electrical Engineering and Mechatronics established a Building Mechatronics Research Centre where the researches have the chance to search the methods and technologies to reduce the energy consumption and to increase the amount of on-demand controlled, on-site produced renewable energy. In the laboratories of the Research Centre, engineering students are also involved to get acquainted with modern, industrial technologies, and to take part in researches and projects.

In this study, we will present the importance of the CAD modeling in bioengineering. The objectives of this study are to create 3D models of the lower leg bones, create a reference system and the component assembly. Using the principles of reverse engineering, we will start from the real bone, taken from human cadavers. After scanning it we will obtain three-dimensional images of the bone in various positions. The model that resulted from scanning was “processed” in the program design CatiaV5R20, SurfaceDesign module. After modeling, we will define proper axes and planes corresponding to the assembly (according to the information obtained from the research literature). Regarding the reference system that we used, we proceeded to the election of a primary reference system to which all 3D bones will be reported. Also, for a better management of the assembly and for highlighting the various pathological situations, we will insert Euler Triedre in the assembly area, between the tibia and foot dome, in the center of the knee joint. Giving to the Euler angles different values, we will obtain different bones positions in the assembly. Creating the CAD system, this will be used in studying various diseases of the bones system and joints of the foot, treatment strategies and surgery.

Saturation diving is based on the principle that the tissues and blood of a diver’s body absorb inert gases and reach saturation point where the pressure of the dissolved gas in the blood and tissues is the same as that of the gas in the lungs. Saturation diving allows divers to remain at working depths without concern for decompression and it makes deep diving operations more efficient. Thermal comfort during the helium –oxygen breathing mixture saturation diving, was verified by experimental determinations and calculation of thermal flux density lost. The results were compared with those obtained from the air unit diving, of the subjects with similar physical, in similar conditions of temperature and deep.

HPNS (High Pressure Nervous Syndrome) is medical disorder connected with the diving activity. This syndrome occurs when a diver descent very fast below 150 m depth, in a breathing environment represented by a helium – oxygen mixture. The disorder consist in psycho-motor and neurology type effects which represents in fact, the deep diving upper limit above which the human body decreases in performance. When a diver is selected to perform a deep diving course, he has to pass an evaluation stage in order to prove his ability to tolerate the compression speed accompanied by the helium - oxygen breathing mixture without encountering the HPNS effects. The deep diving test consists in postural tremor and the EEG (electroencephalography) registration, in both conditions: at the atmospheric pressure and at 180 m deep too. Then the results obtained at the surface percentage limits are fixed for the maximum deflection agreed between the values registration made under pressure and the atmospheric pressure (surface) values.

— In this study, we will present the importance and the advantages of using simulation and modeling methods in computer-aided design to orthopedic surgical techniques. The 3D model of the bones was obtained using reverse engineering principles. The existence of the 3D model provides an opportunity to assess conceptually bone size, shape, specificity, structure, and the existing pathological situation. On the model we can consider references, elements such as points, lines and planes useful in surgery. It also can be made virtually the mechanical performed during actual operation such as drilling, bone cuts and the bone can be assembled with the implant used, achieving practically a virtual operation. The method will be exemplified in two common operations performed in the knee joint. Virtual operations will be carried out using the program CatiaV5R20. Great advantage is that obtaining better results allows a proper optimization of the virtual operation.

The work presents in essence an optimization of injection important parameters for a complex piece on a machine injected with a suitable injection mold. It also outlines the important factors that influence the flow of plastic material to fill the matrix. For a case study we took a piece of polypropylene material type “filter”, an injection machine type BA 500 CD. In order to choose the optimal parameters of the injection, it has been used CAE and MPI/FLOW simulation programs. By adjusting the optimum parameters for the injection machine was obtained a quality injected piece and a lower cost price.

One of today's most important research directions in the building sector is reducing energy consumption. In Hungary the residential sector is the biggest energy consumer with 40 % from the total energy consumption of the country. A possible way to decrease energy consumption is using renewable energy sources. In this work I show a short description of Photovoltaic cells and some measurements.

—This paper presents scientific studies on the development and use of analytically models of the processes occurring during operation of a single cylinder compression ignition engine powered by bio-fuels. Combustion parameters as cylinder pressure, rate of increased pressure and rate of heat released have been obtained experimentally, and they were studied by simulation. The use of bio-fuels has been boosted by the severity of current rules on emissions standards and requirements for keeping satisfactory performance in compliance with these rules. The present rules promote the use of bio-fuels for replacing classic fuels, to help promote use of renewable energy.

The paper presents the research and analyze of traffic flow and its characteristics in a busy traffic zone which make the connection between the downtown Sibiu and the exit to Brasov. Six intersections are analyzed along the main artery raising this problem. The main objectives of this paper are to reduce delays, optimization of the traffic lights timing and intersection geometry changes. By synchronizing traffic signals ensure a better flow of traffic minimizes fuel consumption and reduce pollutant emissions. The simulations performed with the software Synchro shows that decisions to optimize traffic lights intersections can be applied very well in a larger area.

The economic development of a country cannot be conceived without a market for petroleum products that can efficiently sustain activities from economic sectors as well as resolve social necessities. In these conditions we can consider that petroleum products are part of energy products and they will remain for a long time a measure of quality of life and economic development, but also their commercialization as interest for profit. The contemporary society knows, for the marketing of petroleum products, an increasing globalization process as well as diverse marketing methods. Restructuring various petrol companies is not a goal in itself, but the main way to achieve the satisfaction of petroleum products consumers in safety conditions, at prices that ensure the expected profits and with the assurance of the ambient environment. As is know the situation in the field of petroleum products is very mobile, constantly changing. Therefore our analysis must be viewed in the context of its making.

Building Mechatronics Research Centre in the University of Debrecen, as intelligent building provides research infrastructure for building mechatronics simulations. The energy consumption habits of education and living activity are investigated. Our major research topics are energy efficiency, optimization, the development of energy measurement technologies and intelligent building automation. This article presents the history of the Research Centre and the building automation technology with the embedded device from National Instruments: sbRio reconfigurable FPGA platform, apable of massive parallel working and adjustable to the building ervices challenges. The real-time development environment to develop, test and evaluate different building automation scenarios including building structure, HVAC systems, control algorithms and inhabitants generated demands could be utilized by SMEs, providing building services as the enhancement of the competitiveness of the building services. The simulation environment could be more precise and capable of planning a renewable energy system more proper to meet costumer’s ideas and requirements.

Our paper is focused in characterizing multi-layer acoustic panels made from recycled tyre rubbers (GTR’s) in order to determine the sound absorption properties of these new materials for different applications such as sound barriers. This waste is currently used as modifier of asphalt, sport surfaces, molded and calendered products. Two types of products can be obtained from the waste of the tyres: fibers and rubbers. Multilayer panels of thickness 10 mm and 20 mm have been made for a three layer disposition: rubber-fiber-rubber. Then, the standing wave tube method has been used to determine the sound absorption in these materials. Rubbers are used in two different granulometries: 0,7 mm and 2,2-4 mm. The results show that multilayer panels made of 2,2-4 mm granulometry present a higher acoustic absorption in the studied frequency range (400-3500 Hz).

The plastic materials are widely used in all cutting-edge of industries or domestic sectors with multiple applications. During of plastics’ fabrication process can be occurred some failures that can have a negative influence about the final form of parts and the quality product of assemble. The main failures can be divided in types as crack, wear, deformation, degradation and aesthetic alteration. This paper has the aim to present a few aspects of the evaluation of plastic failures and the analytically approach used to assess these failures to enhance the quality and lifetime prediction of plastic component parts.

Our application is based on a 3-tier database architecture composed by Presentation, Logic and Database layers. Though the Crawler module we extract relevant data from archive of orders with maintenance operations and spare parts. In this paper, we focus on Presentation layer, the topmost level of application by which users have directly access such as a web page or application GUI (graphical user interface). Through this layer the user ask for information, it communicates with other architectural layers in order to output, the text or graphical results. Showing users a bulk table of data is not always a good approach. Instead, this GUI shows especially graphic drawings of the data and diagrams. Using this representation of data in an open friendly interface the user is empowered with great understanding of the patterns that might occur on part assembly or dependencies between changing some parts and damaging others.

The impact with friction between a free falling ball and a rotating disk around a vertical axis was studied in a series of previous papers under the assumption that the ball-disk dynamic system is a plane one, but the contradictory results obtained lead to leaving this hypothesis. Considering the impact between the same ball and the tilted immovable disk, the dynamical and kinematic parameters of the system result with appreciable errors. The elastic characteristic and the micro topography of the contact regions can be found only statistically and therefore finding the kinematic and dynamical parameters of the system should by obtained via statistical methods.

For both academics and practitioners concerned with Business Intelligence (BI) systems, one of important issues is to identify the factors which are vital for successful implementation of BI projects. Hence, this paper offers a broad summary of the most common and impact factors which can be influenced in implementing BI projects. We believe it is valuable to determine these factors, particularly for managers of those companies are involved in implementing BI projects and they face to evaluate readiness of their organizations before launching the project in pre-implementation stage. The objective of this paper is to provide a better understanding of the important and critical success factors and it is to conduct a survey and comprehensive study of the critical factors in evaluation phase of the readiness by classifying the factors into two main categories; organizational and technical. It is obvious that each category has its own characteristics and a brief description of each factor is discussed.

This paper proposes road decongestion of Sibiu city traffic considering two options for improving an intersection. The first one consist in improving the traffic light timing for reducing the idle times and optimization of red and green times and also reducing the acoustic emission so improving the needs of an actual modern traffic. The second option consist in elimination of the traffic lights and building a new road as an alternative vehicle traffic in the eastern and south-eastern side of the city.

The paper presents the situation nowadays regarding the door to door public transportation. It highlights the key factors that influence the door to door public transportation system along with the advantages and disadvantages produced in the transportation field. The main areas this paper is focused on are: prioritization of public transportation, transport hubs, ticketing system, trip planners, all of them used to increase the passengers’ mobility. A parallel between three countries in E.U. region: Holland, Portugal and Romania presenting the reached level until now along with the future plans in door to door public transportation mobility was made. Solutions to increase the public transportation mobility are: prioritizing the public transportation vehicles, informing the car drivers, creating intelligent infrastructure, more accessible and high-tech transport hubs. Solutions to attract more passengers: easy access to information creating: websites, trip planners, data for smart and regular phones, info panels in stations, info desks; easy ways to collect the fare from users: paying by scanning your mobile phone, recharging the contact less card online or at any automated teller machine (ATM) with credit and other benefits for users such as: free internet in the vehicle, television (TV) with news in vehicles, the possibility to use the transportation contact less card for other purposes: access in parking lots, stadiums, cinemas, library, work office, rent a car or a bicycle and the facility to take the bicycle with them on the bus, tram, metro or train.

Frictional noise from the contact between tires and pavement contributes significantly to overall traffic noise. The level depends on the type and condition of tires and pavement. Frictional noise is generally greatest at high speed and during quick braking. In this paper was analyzed the influence of roar characteristics and tire types over the noise produced by the vehicles. There ware made noise measurements with a specific vehicle, in different conditions (on asphalt and concrete roads and with summer and winter tires). The measurements ware made considering Noise Romanian Standard.

Nature and amount of taxes and other charges, the structure of the tax system may significantly affect the competitiveness of national economies. Countries with higher tax rates may get into in a less favorable competitive situation compared to countries with lower tax rates. However, the maintaining the budgetary discipline and avoiding an excessive government deficit may restrictively affect the endeavor to decrease tax burden. The nature and extent of taxes on labor income and para-fiscal contributions have changed in Hungary over the examined period (between 2002 and 2011). The progressive taxation on labor income was replaced by the flat income tax rate (16%) in 2011. The study examines the impact of changed personal income tax system on the tax burden of labor income.

In this paper it is presented one model of distance measuring to some objects using an ultrasonic sensor. The objects have different shapes and are displayed on some presets distances over the sensor. For the measurements it was use a Parallax ultrasonic sensor. The operational principle of an ultrasonic sensor is based on the generation of acoustic waves and their detection when reflected by an object. The measurements results are used to improve the mobile robots navigation.

3D Modeling of mechanical structures as multi-body systems, with a minimum number of bodies, in the aim of real time simulation of the product dynamic behavior, using computer performing software, is a necessity. For a company, it saves time in product developing, reduces the number of physical prototypes and experiments, reduces the prices of product and also, increases the quality of product. The paper presents aspects regarding the modeling of a mobile coupling as multi-body system, using ADAMS. First there is presented the coupling parts geometry 3D modeling. Then are defined the geometrical and kinetically restrictions between the parts. Finally, there are presented some aspects about the simulation and the results of this. In the final part of the paper, there are presented the conclusion.

The paper is based on the previous author research with the aim of research and implementation in services fields of washing-cleaning or periodical inspection of operational robots systems, used at exterior frontage of buildings that are realized from modular glass panels. The climbing constructive variant of robot is designated at service fields of robots, which are more used in cleaning-washing services of frontage buildings with glass walls. The system is composed from mechanical system with light structure, power system formed by pneumatic-vacuum system, and command-moving in conformity with predictable software.

In this paper we discuss the forced vibrations of a single degree of freedom system with nonlinear arbitrary integer order damping and with linear stiffness. The method used for our theoretical study is the multiple scales one and the complete calculation is performed for the case of the third order damped system. For this mechanical system the authors obtained the analytically characterization of the motion around and a simply stable equilibrium position for the unexcited system. A special discussion is reserved for the steady-state motion. Finally, a numerical analysis is performed using the Runge–Kutta fourth order method and the theoretical results are compared with those obtained by numerical simulation, a good agreement between them being found. The condition found for the simply stable equilibrium position is in this case identical to that for the stable motion of the system.

The speed multiplier is the main component of the transmission of wind turbines. The problem of choosing the optimal scheme of speed multiplier is one of the first to be solved in the process of designing such a transmission. The co-axial speed multipliers can use one of the two specific solutions: with two spur or helical gears or with planetary gears. In choosing between these solutions, few criteria like load capacity, volume and costs must be considered. The paper is giving recommendations for choosing the optimal solution of speed multipliers.

The dynamic loads that appear in these conditions can be considerable, in comparison with the static forces, and their being token into consideration at the gearing planning is compulsory. The interior sources are represented by the deviations from the tooth-processing precision, especially the error of the measured step on the basis circle

The analysis of the maintenance activity is not complete if the strategy aspects are not highlighted as well. Considering the specific situations a company might find itself in at a certain moment, the paper presents a few possible strategies for approaching the maintenance activity, highlighting the fact that its organization can be made considering four strategic alternatives.

Thermal analysis (DSC: Differential Scanning Calorimetry and TGA: Thermo-gravimeter Analysis) of SEBS blends have been studied in this paper. SEBS blends were made using two transparent SEBS commercial grades with extreme hardness values. The first thermal property determined in SEBS blends was the evaluation of the thermal degradation at high temperatures (DSC). Another thermal property of the SEBS blends consists in knowing the degradation process of the blend (TGA). It should be emphasized the good resistance to degradation for both, the two commercial grades of virgin SEBS with extreme hardness, and blends obtained with these materials.