Advanced Materials Research Vols. 455-456

Abstract: A solution of intelligent test system for mechanical property of geotextile material which based on high speed data acquisition card PCI-1714 is introduced in this paper. Microprocessor and drive card PCI-1240 are also used to control and drive the test equipment. The article discussed in detail the system’s overall design, the hardware structure, software design, and process of data acquisition. Software is designed by Visual Basic 6.0. This paper research and implement on accurate measurement of mechanics performance of geotextile material.

Abstract: This study developed by double rollers castor capsule their shell machine key components out the design and mechanics analysis. Builds force and deformation of the mathematical model: when castor capsule in force, and rollers deformation enables delta R, two of the gap between rollers and rolling Angle, castor capsule diameter and rubber roller diameter relevant, using mathematical software MATLAB) calculations. The positive pressure P size with rolling Angle, castor capsule diameter and rubber roller diameter, clearance changes. As the rollers speed increase, castor capsule stripping net rate present first increases, and fell trend; And present first decline and damage rate rise. With two rollers gap increase, castor capsule stripping net rate and the damage rate decreases, conversely, as the two rollers clearance decreased, castor capsule stripping net rate and the damage rate increase.

Abstract: Droplet drift is always an accompaniment of pesticide spraying and can cause serious consequences. In this paper, we used a computational fluid dynamics software package (FLUENT) to analyze flow fields of spraying with air jet under different conditions in the tunnel model, and compared the effect of air jet on spray deposition and drift. Results of this study indicate that air jet can act directly on the spray droplets and affect their distribution and movement. Larger jet velocity has better performance on the drift reduction and droplet deposition. Droplets in the flow fields with larger jet velocity can get more kinetic energy and arrive at the root of crops easilier. When droplets are released straight down, larger velocity of droplets can be given and better performance can be achieved either in terms of drift reduction or droplet deposition.

Abstract: .The research which aimed at low integration and inefficiency of the management in the existing tool management of the machinery manufacturing enterprise (group) in our country, based on the tool whole life cycle theory to develop a tool whole life cycle management system. Tool whole life cycle management not only achieves tool operation management but also achieves tool cost management. The system could use network database to store the data and output the data by the form of sheet. And it achieved tool information inquiry, distribution and integrated management.

Abstract: The (H)CFC-phase out and the fear for future problems for other synthetic working fluids, because of their known and unknown impact on the environment, have introduced a rising interest in environmentally safe natural working fluids. CO₂ is one of the few non-toxic and non-flammable working fluids that do not contribute to ozone depletion or global warming, if leaked to the atmosphere. Because the critical temperature of CO₂ is only 31.1°C, the transcritical cycle can be used to improve the coefficient of performance of the system. The experimental investigation and theoretical analysis on transcritical carbon dioxide heat pump system are carried out in this paper. It points out that there is an optimum operational pressure on transcritical carbon dioxide heat pump cycle, when the outlet temperature of gas cooler is constant, the coefficient of performance increases with increasing evaporating temperature at the same conditions, and the operational efficiency increased with decrease of gas cooler exit temperature. So in order to obtain the optimum performance, the influence of evaporating temperature, gas cooler exit temperature, and the operational pressure should be considered during the designing and operating transcritical carbon dioxide heat pump system.

Abstract: The real time power prediction of power battery pack used in electric vehicles is a difficulty of the battery management system. The internal resistance characteristic of the battery can be used to achieve the prediction of battery power based on the close relationship between the value of real time power and internal resistance. In this paper, the internal resistance characteristic of the power type lithium-ion battery are tested with HPPC(hybrid pulse power characterization) method, the relationship curves between the capacity or internal resistance of the battery and temperature are given, the temperature properties of the capacity and the ohmic resistance of the battery are obtained, and the basis of online resistance identification and peak power computation for the battery pack is provided.

Abstract: Because the refrigerant can cause serious damage to the ozone layer and form the greenhouse effect, developing green environmental protection refrigeration technology has become a consensus. Based on the view, this paper puts forward a new device called the solar energy driven VM cycle heat pump which used the natural working materials—nitrogen as the refrigerant and the clean energy—solar as the driven energy. According to build the thermodynamic model, the influence of heat source temperature on the ideal cycle has been analysed. And COP of the solar driven the VM cycle heat pump will be received. With the city of Beijing, for example, the device refrigeration COP can reach at least 1.4.

Abstract: A new type of electrolytes for low temperature operation of Li-ion batteries was formulated in this work. Instead of LiPF₆, LiBF₄ and LiODFB were used to form this new type of electrolytes, although LiPF₆ is the mostly chosen solute in the state-of-the-art Li-ion electrolytes. It was found although a LiBF₄-based electrolyte had a lower ionic conductivity than that of a LiODFB-based electrolyte, a LiODFB-based electrolyte demonstrated improved low temperature performance. In particular, at-30°C, a Li-ion cell with 1M LiODFB dissolved in a 1:2:5 (wt.) propylene carbonate (PC)/ethylene carbonate (EC)/ethyl methyl carbonate (EMC) mixed solvent delivered 86% of the capacity obtained at 20°C. Furthermore, the cells with a LiODFB-based electrolyte showed lower polarization at-30°C. The above results suggest that beside the ionic conductivity of an electrolyte as a limitation to the low temperature operation of Li-ion batteries, there was interface impedance having effect on it. Analysis of cell impedance revealed that reduced charge-transfer resistance by using LiODFB resulted in improved low temperature performance of Li-ion batteries.

Abstract: ZnO/vermiculite as the novel photocatalysts were prepared by two approachs: one is mixtures of ZnO and different acid treated vermiculite, and another is sol-gel method. The acid activated vermiculite as a new promising catalyst support and adsorbent has a large capacity of absorption, high surface area and thermal stability. The activity of catalyst has been interrelated to support and ZnO. Based on the important effect of support on ZnO/vermiculite photocatalysts, treatment of vermiculite by nitric acid of different concentration was studied by evaluated in the photocatalytic decomposition of MB with resulting photocatalysts. BET surface area measurement and X-ray diffraction (XRD) analysis were used to characteristic of ZnO particle in acid treated vermiculite structure and the phase structure and crystallization index of ZnO in the modified vermiculite mineral. Results showed the ZnO-vermiculite combination possessing higher photocatalytic activity due to the synergistic effect when compared to the commercial ZnO.

Abstract: Contamination accumulation characteristic of the insulators depends on the kinetic characteristic of the particles moving around the insulators to a great degree. There are many forces acting on the particles due to the combined influence of the electric field, the air fluid field and the gravitational field. The main four forces, which are the polarization force, the electric field force, the steady-state drag force and the gravitational force, were analyzed. Their effects on the moving particles’ trajectories were studied by both experiments and numerical calculation. The results indicate that the polarization force acts where the strength of the electric field changes strongly. Once the particles are charged, the electric field force acts and can drive the particles moving along the electric field lines. When there is a strong wind, the steady-state drag force is dominant and the particles move with the wind. These results can better explain the contamination accumulation characteristic of different insulators under different operating conditions.