Advanced Materials Research Vols. 317-319

Abstract: Based on the structure and characteristic of automotive refrigeration system and engine circulation cooling water system and exhausted waste heat system, combing the working principle of lithium bromide absorption refrigeration system, the authors used the automotive exhaust pipe and cooling water tank improved as the generator of the lithium bromide absorption refrigeration system, which might realize the objective using the lithium bromide absorption hot-cold water unit to replace the automobile air conditioning refrigeration and heating system and the automobile engine cooling system. The methods of the thermodynamics, the heat transfer, the hydrodynamics are used to do the computation of the thermodynamic and the heat transfer area of the lithium bromide absorption refrigeration system. The result shows that it makes good use of exhausted heat of engine circulation cooling water and exhausted waste and reduces the consumption of oil. And structure is simple and compact for small heat transfer area of the automotive exhaust pipe and cooling water tank improved.

Abstract: Based on the structural entropy, this paper establishes a model for analyzing the degree of order of different structure of small or medium sized make-to-order stationery enterprise by using system limitation entropy and quality entropy. This quantificational method to evaluate the process optimization of production system is well validated.

Abstract: The synthesis, characterization, and its coordination with metal ions of a novel thiourea N,N'-diethoxycarbonyl-N'',N' ''-(1,2-propylidene) dithiourea was reported. The structure of the prepared compound was determined by elemental analysis, infrared spectrum, mass spectrometry, 1H NMR and 13C NMR spectroscopy. Its coordination with metal ions such as Cu²⁺, Ni²⁺, Fe³⁺ was investigated by uv-vis spectrophotometer. The results show that this dithiourea with new structure can react with Cu²⁺ and Ni²⁺ separately, and has a best selectivity to Fe³⁺ ion. Bench-scale flotation tests were also carried out, verifying it has higher copper flotation recovery compared with universal collectors and better selectivity to sulphur.

Abstract: Fangzi, a century town, born because of Jiaoji Railway , still retains the old style, showing unique town layout and the historical and cultural landscape as a modern industrial town along the Jiaoji Railway, preserved basic integrity of the modern German-style architecture. In recent years, as urban development, adjustment planning of urban industrial layout, Fangzi, as the representative of industrial and mining town is facing a crucial decision. This paper through the understanding of the process of formation and development of Fangzi, urban pattern and architectural style, from the angle of science, history, art, culture to made the value research, and finally to identify strategies to protect and re-use, in the meantime, provide reference for the same type towns.

Abstract: Hybrid Excitation Doubly Salient Generator (HEDSG) with parallel magnetic circuits is performed in this paper, and the main flux in the machine is determined by the permanent magnet and the field coils. The structure and working principle of the generator are described in detail. In order to build the voltage regulation system of HEDSG, a bidirectional excitation voltage regulator is proposed, which could keep the output voltage of the generator stable by adjusting the field current. The two control loops including excitation current feed-forward and output voltage feedback loops are applied in the voltage regulator. Subsequently, the mathematical model of the voltage regulation system is constructed after the transfer function of the generator is obtained by using system identification method. Moreover, in order to realize the field current bidirectional flow, bipolar pulse width modulation is also applied in the regulator, and the control parameters influencing on the output voltage are analyzed. Lastly, the prototype of bidirectional excitation voltage regulator is designed and theoretical analysis and simulation results are verified by the stable and dynamic experiments.

Abstract: As an accident analysis tool, the simulation system of vehicle collision are developed. On the basis of momentum conservation, speed analysis model for vehicle rear-end collision was established. Then the analysis algorithm was designed. Based on the function structure design, the simulation system for vehicle speed analysis of rear-end collision was finished with Visual C. An actual example was also applied in the system. The simulation result is very closely to actual condition. It indicates that the simulation system is adaptive for analysis of vehicle collision.

Abstract: In order to research the relationship between the life of hull with different structure and the reliability while using, a life estimation method for hull based on test was proposed. By assuming that the hull life span satisfied the Weibull distribution, with zero-failure data, confidence limit γ and reliability R, the confidence lower limit of reliable life were given according to test data of the hull life span. If the lower limit of the shape parameters of the Weibull distribution were known, this method can accumulate all of zero-failure data to increase the analysis presion of reliability greatly. At last, using this method, under the hull reliability R and the confidence γ, the confidence lower limit of reliable life with the hull structures as steel, titanium alloy and aluminum alloy were computed. The results indicate that the method is easy to compute and very convenient for engineering application.

Abstract: The electrical machinery power factor and the rotational speed are unable the real-time measurement which is restricted by the condition on site, so the motor output power also can't calculate accurately, which leads to difficulty to calculate the pump efficiency. This paper considers pump's differential pressure, pump flow, the liquid viscosity and other parameters, which influence on the calculation results. Then we present a new calculation method of efficiency for twin-screw pump. We program the simulation computer to calculate and analysis the pump efficiency with the calculation method. The results show that this method is simple and the error is less than 3%. This calculation method can meet the needs of engineering calculation.

Abstract: The purpose of this paper is to show the development of Petersen coil and compensated network in the high voltage power distribution networks of China. There were two correlative questions when the Petersen coil is used, one is to restrict the series resonance under normal conditions, and the other is to choose the grounded line correctly. The KD-XH Coil, which uses the servo-control adjustment, has high response speed (less than 5 milliseconds), continuously adjustable current output (from zero to rated value) and linear V-A characteristic, and shows high accuracy in applications as soon as the grounding fault occurs.

Abstract: With the development of E-business, supply chain management of manufacturing enterprises becomes more efficient,making business transactions more simplified, and meanwhile, organizational structure is transformed into open flat network structure from a pyramid hierarchical structure. Therefore, it is essential that manufacturing enterprises view as a whole function processes various businesses inside the enterprises and between the nodes at the supply chain, comprehensively improve the level of human capital through the form of virtual enterprises and establish management teams with the innovation consciousness.