European Journal of Technology and Design

56-67

Authors: Vyacheslav V. Limarenko, Inna P. Havina

The formulation and solution of the problem of optimization of the parameters of metal processing during the turning operation are shown. The task is solved taking into account the level of accumulated wear on the back surface of the tool, the level of machine efficiency that depends on the operating modes and the period of economically effective tool life. The problem was solved in a multicriterial formulation with three objective functions taken into account, the solution was obtained as a Pareto optimal solution. During the solution, an artificial neural network perceptron and the genetic algorithm FFGA were applied. This approach allows solving the problems of optimization of real production.

77-82

Authors: Do Nhu Y

Vietnam has many advantages of wind power resources. Time by time there are more and more capacity as well as number of wind power project in Vietnam. Corresponding to the increase of wind power emitted into national grid, It is necessary to research and analyze in order to ensure the safety and reliability of win power connection.In national distribution grid, voltage sag occurs regularly, it can strongly influence on the operation of wind power. The most serious consequence is the disconnection. The paper presents the analysis of distribution grid’s transient process when voltage is sagged. Base on the analysis, the solutions will be recommended to improve the reliability and effective operation of wind power resources.

14-19

Authors: Bard Bajçinovci, Uliks Bajçinovci, Bujar Bajçinovci

The Metabolism architectural concept, with its fundamental architectural and urban ideas has attracted the attention of wide architectural communities to Japan art development in the 1960-1970s. Nowadays, in 2010 more than half population live in modern cities, and by 2050, 7 out of every 10 people will live in urban areas. The study presented in this paper, has conceptually researched: architecture metabolism design models of future cities with its proportions and design concepts, mainly focussing on urban form and functional structures. This research, applied an empirical method through the arranged and combined structural models, furthermore, strengthened with handmade models in architectural studio as a research comparable volumes. The models were investigated thru comparative method, and researched mainly through literature review, especially studying structural interrelations of the: forms, position, proportions, and volume transformations thru time intervals. Global and wide actions are irreplaceable and crucially necessary to maintain the public health conditions in appropriate scale of modern cities. The current state of cities, requires specific municipal’s responsibilities in situations when we are facing potentially hazards of public health. According to the conceptual conclusions of this study, we much prefer spatial patterns where the urban zones are more concentrated with high-rise structures, although preserving the land use for vegetation. Hence, we further argue that in ‘verticality’ the high-rise structures can be considered and environmentally treated as vertical farm ‘green’ mega cities. Urban planning issues, regarding to the: air pollution, climate changes, and public health hazards, fundamentally requires a holistic integrated environmental action. Global measures, as an environmental healing strategies!

26-36

Authors: Junjie Chen

Aiming at developing general design guidelines of integrated multifunctional microreactors, ammonia decomposition thermally coupled with methane catalytic combustion in catalytic microreactors for hydrogen production was studied numerically. The effect of flow configuration on the operation characteristics was studied, using a two-dimensional computational fluid dynamics model. Different performance measures were evaluated to assess the operability of the reactor. It was shown that complete conversion of ammonia can be obtained in both flow configurations. A proper balance of the flow rates of the decomposition and combustion streams is crucial in achieving this. For a given flow rate of combustible mixture, material stability determines the lower power limit, whereas the maximum power generated is determined by extinction at large decomposition stream flow rates. The two flow configurations were contrasted based on multiple performance criteria. They were found to be practically equivalent for highly conductive materials. Using properly balanced flow rates, the co-current flow configuration expands the operating regime to low and moderate thermal conductivity materials as compared to the counter-current flow configuration that exhibits a slightly superior performance but in a rather narrow operating regime of highly conductive materials and high ammonia flow rates.