Abstract: Ni/MoS2 composite coatings with different content of MoS2 were produced on the surface of 1045 steel by laser cladding technology. SEM and EPMA were used to analyze the microstructures and micro area compositions of the coatings. Dry friction and wear properties of the coatings were tested by friction and wear tester. The results indicate that the microstructures of Ni/MoS2 composite coating are large quantities of different-form white silicides and black sulfides distributing on the substrate. The sulfides mainly consist of CrxSy, MoS2 and FeS. When the content of MoS2 is 9%, Ni/MoS2 composite coating exhibits best tribological properties.
Abstract: Well-aligned TiO2 nanotube arrays were fabricated from anodization by a subsequent heat treatment. Rate performance and electrochemical properties of TiO2 nanotube arrays were studied intensively. The electrode exhibits excellent rate capabilities at various rates with an average coulombic efficiency reaching 95.6%. It is obvious that TiO2 nanotube array possesses high rate capability and excellent cycling stability.
Abstract: Solar energy directly converses light energy into DC power without fuel, no moving parts, no pollution, and no noise with long life-span more than about twenty years. Its application is extensive and the set up of solar generation can be scattered and in a small amount on demand which is the most available of all renewable energy, and is the most practical and effective energy. There are many kinds of solar cell, such first generation as Mono-crystalline Silicon, Multi-crystalline Silicon, and Amorphous Silicon, the second generation as Film Photovoltaic and the third generation as Dye-Sensitized (DSSCs) etc. The utilization of solar energy is greatly influenced by environmental change with the main reason of solar radiation. This research collects the data from the test of Mono-crystalline Silicon, Multi-crystalline Silicon, and Film Photovaltaic solar cells in different solar radiation, and then conducts the analysis and research thereby. Using the program written by Labview, collect the data of voltage, current, and the power, solar radiation, and temperature emitted by solar cells under test for analysis. And then discuss the results of the collected data by Matlab for data analysis.
Abstract: In feasible research of wind farm construction, wind resources assessment is an important process. The grade of wind resources is the crucial qualification in the construction. It determines whether this wind farm is profitable or not. his paper introduces the theory of wind energy resource assessment firstly, including: wind power density, wind speed correction and Weibull distribution. Then take Yishui wind farm as example to calculate the wind energy resource assessment.
Abstract: Facing the new century design, we should take full consideration to green design in design, and should have the systematic concept when we design, to save resources, protect the ecology, prevent the pollution, and protect the environment as the guidance. Based on the green design concept, this article analyzes the process of design, discusses the connotation and meaning of green design, expound the process of the green design and combine the multiple conception and meaning of green design to confirm the various requirements and consideration of design process. This article also perfects the green design evaluation methods and provides certain guidance and reference for the green design evaluation.
Abstract: The performance of the hybrid wall powered by solar energy was numerically simulated. The factor of H/W was discussed The performance parameters include the induced air mass of the outlet, the induced air velocity of the outlet and the temperature difference between the inlet and the outlet. The results show that ratio of H/W has an important effect on the performance of the hybrid wall powered by solar energy. The induced air mass of the outlet is decreased linearly with the ratio of H/W in a logarithmic coordinate. The temperature difference between the inlet and the outlet increases with the increasing of the ratio of H/W. But for the induced air velocity, it increases with the increasing of the ratio of H/W, and when the ratio is higher than 10, it decreases with the increasing of the ratio of H/W.
Abstract: s: The obvious characteristics of transcritical CO2 cycle are that the heat rejection process takes place in the supercritical region (about 8-12Mpa). The heat transfer features of CO2 under supercritical pressure are different from those of the conventional refrigerants. And the heat transfer performances comparison study for supercritical CO2 fluid and the conventional refrigerants are carried out by means of thermo-physical properties analog analysis and experimental results quantitative comparison. The special properties variation of supercritical CO2 fluid makes its heat transfer performance different from the conventional fluids. From the view of properties analysis and quantitative comparison, the heat transfer performance of supercritical CO2 is equivalent to the condensation heat transfer of conventional refrigerants. Although the condensation coefficient is very large since there is phase change and latent heat variation in the condensation process, there is liquid film thermal resistance. While in the supercritical CO2 cooling process, there is no liquid film in existence and the thickness of the boundary layer is very thin. The heat transfer temperature difference is very large, so the heat transfer performance in the supercritical CO2 cooling process is equivalent to that of the condensation heat transfer.
Abstract: The corrosion behavior during friction of refined bio-oil by distillation process was evaluated by high frequency reciprocating test rig. Both scanning electron microscopy (SEM) and energy dispersive spectrometer (EDS) were used to investigate the morphology and active elements contents on the rubbed surface on steel disk. The chemical structures of the oils and the topography and surface roughness of the wear scar were also studied by FTIR and surface roughness tester as well, respectively. The experimental results showed that corrosion behavior of bio-oil was improved after refining since the wear depth was 3.75µm and the worn surface roughness was 0.172µm, while they were 12.5µm and 0.217µm before refining. It was concluded that corrosion degree of worn surface was decreased after the bio-oil was refined, which was ascribed to the decrease of the acidic component content after the refining process.
Abstract: Nowadays, due to the huge energy consumption, the energy-saving problems of the product have been emphasized with many designers. In this paper, informed by the modular design method, the total energy performance in modular product can be analyzed and separated into the energy performances of basic modules. And with the physical analysis of basic modules, the energy equations are established with the band graphs theory. Then, the physical parameters, which could influence the energy consumption, are identified as “energy factor”. Thus, the energy consumption of the modules could be optimized with adjusting design factors, and the energy-saving design scheme for the whole product is obtained in the optimized model. Finally, the model and the method in this paper are demonstrated by an instance of the crank block pump.
Abstract: Cryostat is an important equipment of International Thermonuclear Experimental Reactor (ITER).It is the outer part of ITER Tokamak. There are three issues to solve the parametric design of cryostat: First, the parametric description of cryostat model; Second, program design; Third, the establishment of Database. In this paper, take a simplified model of the cryostat as an example, after the parametric description of cryostat finished, the parametric design of cryostat has realized through ACCESS Database and the automation technology of the secondary development of CATIA under VB (Visual Basic).