The water, in its circuit, passing through various types of uses (industrial processes, domestic uses), is loaded with various materials and substances, turning into what can name by a general term "wastewater". Taking into consideration the problems Romania deals with regarding wastewater treatment, the present paper proposes to investigate the possibilities through which, municipal wastewater can be treated in small plant. In this sense, the infrastructure necessary for wastewater treatment systems must be made in the context of sustainable development by identifying the defining characteristics for each area, local and even individual households.

This paper provides some mathematical models associated with bioremediation processes. Bioremediation is a process in which contaminants in polluted soils are eliminated by bacteria. The initial model is the one given by Keller and Segel. The Keller- Segel model takes into account the movement of bacteria by diffusion and chemotaxis. Starting from this generalized model, we present different forms of diffusion and chemotactic coefficients. All particular cases presented were confirmed experimentally or numerically.

The article describes a few theoretical aspects concerning soil depollution processes. Techniques for the treatment of polluted soils have as an objective the destruction, elimination or immobilization of pollutants. The choice of the soil depollution technique or of the treatment method/type depends on the intrinsic characteristics of those techniques (on performance, installation), and on constraints specific to the site.

The people is the driving force of this century and effective personnel management is the main factor of the relation development with customers if they are based on the quality management principles. All organizations need high levels of customer loyalty.

The aim of this article is to presents the main aspects regarding the influence of the uncertainty and of irreversibility on the investments. This subject is important because in the nowadays, every investment decision must take account of this influence. Also, the article tries to presents some modalities in which is possible to evaluate the degree of the investment uncertainty and of the investment irreversibility.

The server part of an automated ingredients traceability system in a packing-house has been examined. The developed generalized scheme and operation algorithm of the application server have been presented as part of a three-tiered client-server system. A relational database scheme has been synthesized, for storing information about the ingredients, recipes, supplies, expenses and other events, related to the production process. A specialized software application has been developed, which implements graphical user interface for authorized personnel to create/edit recipes, ingredients, add supplies, generate and print reports, etc. The program also plays the role of a middleman between the client interface and the database server, by implementing the developed operation algorithm.

The paper, taking into discussing the loading of the plates due to the presence of some bending moments uniformly distributed on the simply leaned outlines, compare two types of analysis. The appropriate expressions of the vertical displacement and the rotating of the plate, respectively of the radial and annular stresses are shown, for each study case.

Small and medium enterprises are faced with serious challenges. Expansion of global economy, deadly struggle for the markets, drastically shortening of product’s life, rapid technological changes, structural transformations and etc. In order to respond to these challenges, the enterprises need to increase their productivity constantly, to improve the quality of products and services, develop new products and meet the requirements and desires of the consumers. In short, the enterprises have to be innovative all the time, because the imperative of modern business is improving all the components of the structure and business of an enterprise. Capacity of small and medium enterprises to bring more quality, functional and cheaper products on the market indicates the development of innovative processes in those enterprises. Most frequently, new products, which represent the guarantee for their successful work, represent the innovations in small and medium enterprises. Small and medium enterprises are more flexible and easier for adaptation in comparison with the environment and thus, they are far more easily adapted to new circumstances in comparison with the need for innovation of products and services. The role and influence of entrepreneurial innovation in the development of small and medium enterprises is special. It is the key factor of economic development in Serbia, because, according to the relevant data, there are over a hundred thousand companies and over two hundred thousand entrepreneurs that employ 60% of total employees and that participate in social gross product with 50%. The aim of this research paper is to indicate the need for raising the level of innovation of small and medium enterprises through the structure of production and service activity in which new product has a primary role.

Depth control system is important in bulb crop harvester. The higher the depth causes the greater amount of soil entering to harvesting system. A proper depth control leads to optimize energy consumption. A four-bar mechanism was used in order to move the blade of the machine and to control the operation depth while a DC electrical motor provided the movement of the blade. The four-bar mechanism consisted of a power screw, linkage bars, moveable pin and a blade. A control system was used to follow the uneven ground surface and control the displacement of the blade by sending commands to the DC electrical motor. The tests were carried out in laboratory on artificial uneven ground in sinuous curves as well as square and triangle shapes. The displacement of the blade was recorded by a digital camera and converted to image and analyzed using Matlab software. All the tests were replicated three times. The photo sensor responded better than the capacitive sensor for all obstacle shapes.

Investigations of archaeological pottery artifacts using Scanning Electron Microscope (SEM) provide information on pore structure of fired samples of shred belonging to Cris 1 culture. From long ago, the ancient art has been faked. We present a scientific analysis of the pore structure of ancient ceramic samples in order to establish a method that allows us to differentiate between the true and false ancient ceramic sample. The use of the technique is illustrated on both lot of authentic and fakes specimens. Measurement of pore sizes and established the statistical pore distribution in wall thickness of ceramics are highlighted as research area useful in the administration and tracking down the traffic with objects of patrimony.

Assessment is absolutely necessary for an efficient development and it sets precise objectives. After the analysis of the subjects their progress is indicated by the kinesitherapy evaluation. The results were obtained through measurements and were then statistically introduced in an Excel data base, the following step being comparing them with the final measurements. We were thus able to tell whether there was any improvement registered as a result of the entire programme at which the subjects participated, or if on the contrary, they continue to present the same deviations from the average values that are typical of their age.

The sources of noise pollution have increased due to fast development of the industry. Impetuous development of industry in decades has increased the number and power of noise and vibration, and resulting noise pollution in the many jobs and in the some large areas. Scientific investigations have revealed that noise and vibration, which exceed certain limits, adversely affecting the functional and safety features on the aggregates facilities located in polluted areas, with negative effects on safety in operation and product quality.

The implementation of the curriculum reform in Romania has both the expected and side effects. One of these side effects is the teachers exodus to other professions, which prompted us to study their professional satifaction correlated with job performance. The participants were 54 teachers from Brașov. The research method was an investigation based on a questionnaire, to discover teachers' attitudes on satisfaction in their work. To obtain the performance data of the teachers, we used the method of documents study. The results show a low level of overall satisfaction, which is an indicator of the phenomena that correlate.

In this paper a CAD study for generating of complex 3D shapes with superellipsoids, supertoroids and convex polyhedrons based on computational geometry is presented. The 3D representation was performed using Madsie Freestyle 1.5.3 application. Results from this study also can be adapted and applied in geometric constructions and computer aided design used in engineering and sculpture design.

The main process of water’s treatment can be mechanical, chemical and biological. From all mechanical treatment procedures, filtration is the most irreplaceable one in the scheme of a treatment plant. Filtration is the advanced clearing procedure, consisting of water’s passing through a porous material, that has a certain granulometry, named filter layer, used for the retention of the natural suspended particles or previous coagulated particles. Filtering is influenced by a series of parameters.

The Earth receives more energy from the sun in one hour than human population uses in one year. Total solar energy absorbed in Earth’s atmosphere, oceans and land is about 3.850.000 EJ per year. The amount of solar energy that reaches the surface is enormous, such that, in one year, it is two times greater than all Earth’s non-renewable sources of energy.

In this paper there are outlined the investigation results of a technical accident that took place recently on a natural gas transmission pipeline, due to the damage of one of the pipes, caused by a third party interference. In order to determine the failure conditions of the pipeline that experienced this technical accident, the authors used more assessment procedures for defects like dent – gouge combinations, generated by third party damages upon this pipeline. The results of the research performed led to the selection and assigning of the measures that have to be taken in order to keep at an allowable level the risk for such events to occur on natural gas transmission pipelines.