The paper presents the results of the first two phases of the interdisciplinary research project “Research on an ecosystem approach of sustainable development at territorial- administrative level”, a project financed by C.N.C.S.I.S. and coordinated by ASE Bucharest. The project was carried out in Bacau County between 2004 and 2006. The paper highlights the reasons that lead to losses for farmers, year after year, a model for making agriculture more efficient, the outcomes of the model, management of nitrogen in the CAP’s vision.

To produce a good quality material, after the drying process, with minim power specific consumption, it has to know the material isotherm of sorption. For an analytical determination of material isotherm of sorption it has to make a drying mathematical model. This allowed us to know in every moment the local temperature and the moisture content of the material.

An algorithm of an electronic monitoring system performance for evaluating the overall heat transfer coefficient has been developed. It uses a model which describes the energy exchange in an animal farm building. The finite difference method has been applied in the modeling process. The input signals of the model are measured in real time values of the building parameters. Based on the algorithm, a software product has been developed to predict the temperature and the air relative humidity variations inside the building. A structural scheme of an electronic monitoring system for evaluating the overall heat transfer coefficient has been created.

Fixed bed is the most frequently used operation for ion exchange and adsorption and although highly useful and utilized, its engineering analysis is quite complex. A predictive model for fixed bed systems requires extensive experimental information, complex mathematical tools and in many cases, for complicated wastewater, the full modeling of the process maybe extremely difficult. The situation is even more difficult considering the maldistribution, as well as the scale up procedures. It is true that the overall effectiveness of a fixed bed operation depended mainly on its hydraulic performance. Even if the physicochemical phenomena are well understood and their application in practice is simple, the operation will probably fail if the hydraulic behavior of the reactor is inadequate. These effects could be critical not only in full scale but also in pilot or even in lab scale reactors. In the present study – composed by two parts – short cut methods is proposed as a first design tool. The methods essentially propose the use of a minimum number of experimental data along with some scale-up and hydraulic-performance considerations, extracted from the related literature. In part I of the study the theoretical models and hydraulics of fixed bed operations are presented. In part II the issues of scaleup and approximate design methods are presented.

In part I of the study the theoretical models and hydraulics of fixed bed operations are presented. In part II the issues of scale-up and approximate design methods are presented. Part II could be considered as a presentation of the path from the laboratory scale to full scale units. Finally, the methods for derivation of the experimental data needed are discussed.

Search problems are fundamental in artificial intelligence. When domain knowledge is limited or not available, search is the only way to solve a problem. Although search algorithms have been widely implemented using structured or object-oriented programming, the design of a multiagent system for solving search problems raises a different type of challenges. In this paper, the design of such a system is presented, along with some implementation details. The performance of the system is analysed for several problems using different algorithms and parameters.

The paper presents the manufacturing technology for a water oxygenation device called further fine bubbles generator. The fine bubbles generator has a rectangular shape and it can create a screen of fine air bubbles. The manufacturing technology of the drilled board (the board with holes) and the manufacturing technology of the fine bubbles generator’s body are subsequently exposed. A non-conventional technology, namely electro-erosion processing, was used in order to manufacture the board with holes. Fine air bubbles are obtained by this method, increasing the oxygen transfer to the water mass.

This paper analyse through the finite elements method (FEM) the hydraulic motor casing from horizontal Hydraulic Press – 2 MN. The analysis of hydraulic motor casing of horizontal Hydraulic Press – 2 MN was made for determination of displacements, deformations and the factors of safety distribution. A three-dimensional model of the hydraulic motor casing with a complex geometry was generated based on the designed data. Finite elements analysis was performed using COSMOSWorks software. Results predicted by the finite element method show that the presented method is efficient and accurate and in good agreement with the theoretical and experimental values.

This paper describes optimal design of the sealing segments of the linear hydraulic motor plunger from horizontal Hydraulic Press – 2 MN. The analysis of the sealing segments was made for determination of stresses, displacements, deformations and the factors of safety distribution. A three-dimensional model of the sealing segments was generated based on the designed data. Finite elements analysis was performed using COSMOSWorks software. This software tool allows to quickly determine optimal design parameters using computational simulation. The simulation results were evaluated and compared to the experimental data. Results show that the established FEM model provides useful information for the sealing segments optimal design.

This paper presents the influence of synthesis parameters (concentration of acid solution and the solid: liquid ratio) on textural characteristics of bentonite activated clays: nitrogen adsorption/desorption isotherms, surface and pore size distribution. Acid activated clays present higher specific surface area than the natural bentonite used as feed stock and a better adsorption capacity.

This paper presents results of research on the process of forming gums in gasoline resulted from the pyrolysis of the ethane composition: propane, in a proportion of 1 : 3 in weight, at a temperature of 8200C. In addition, it has been researched the thermal stability of these inhibitors by the thermo-gravimetric analysis (TGA). From the TGA thermo-grams, there were appreciated the temperatures of the losses in weight during the heating process. It was found that the presence of inhibitors does not prevent from the formation of the peroxide radicals, but it prevents from their initiation of the reaction chains. The phenols efficiency is improved by alkylation in the positions 2, 4 and 6. The good results are obtained for the substitutes in all the three positions with a methyl group in para and at least a group of t-butyl in position orto comparing with the hydroxyl