Applied Mechanics and Materials Vol. 737

Abstract: In current years, many researches have been worked to find new sources of alternative fuels. In this situation, the water hyacinth will be a new source for bioethanol. In this study, bioethanol extracted from water hyacinth is blended with diesel (5-BED, 5% bioethanol and 95% diesel v/v) and has been used to experimentally investigate the diesel engine performance and emission. The response surface methodology (RSM) technique with three engine operating variables like (i) Load, (ii) Compression ratio (CR) and (iii) Fuel Injection pressure (FIP) has been implemented to evaluate diesel engine performance using bioethanol diesel blend. The equations were obtained for Brake power (BP), Brake mean effective pressure (BMEP), Brake thermal efficiency (BTHE), and NO emission by using quadratic polynomial

Abstract: The utilization of fossil fuels makes great challenge in the environment and aggravates the global warming. As a result, it is rather significant to use renewable energy and develop advanced energy utilization technologies. It’s necessary to study the characteristic of biomass staged-gasification. The paper set up a staged-gasification system, which mainly contained biomass pyrolysis and two-staged entrained-flow bed. Influence factors were studied including gasification temperature and first gasification time, and measured the tar content by cold trap method (CT). The results showed that staged-gasification and increasing temperature could improve the hydrogen content. The optimum condition was the first gasification time at 0.6s and gasification temperature at 1100°C. The result was best in this conditions, hydrogen content could higher 8% than traditional gasification, and gasification efficiency up to 75%, carbon conversion up to 96.3%. Moreover, the tar content was decreased from 5.46g/m³ to 50mg/m³.

Abstract: Biodiesel's composition has a significant effect on biodiesel’s main physical and chemical properties. Through the test and analysis of the composition and the physical & chemical properties of 5 types of biodiesel, this paper uses linear regression model and least square method to conduct a research on the correlation between biodiesel's physical and chemical properties such as density, cold filter plugging point (CFPP), cetane number and kinematic viscosity, biodiesel's FAME content and the number of double bonds in its UFAME, and establishes correlation functions for relevant indexes, providing a theoretical basis for rapid test of biodiesel’s physico-chemical performance index.

Abstract: In the energy efficiency evaluation of renewable energy, in order to confirm the application of solar hot water system of building practical application effect, on-site testing is needed for solar water heating system. During the short term test, in order to improve the testing progress and to reduce the input, the relevant standard proposes the "solar radiation interception method". This paper mainly contrasts and analyzes the results deviation of "solar radiation interception method" in the actual test application. It also improveds the testing methods and testing precision.

Abstract: Wind power prediction is a key problem in optimizing power dispatching. This paper builds a wind power prediction model based on wavelet neural network which substitutes wavelet basis function for the transfer function of hidden layer. A missing data interpolation strategy is also given to improve the applicability of the model. With the wind farm data from southeast coast, the model works and the wind power in the next 30 hours is predicted. In the sense of the mean square errors this paper compared the prediction results of the model and BP neural network model, the results shows the models have a better accuracy.

Abstract: Pure lithium-ion batteries for electric vehicles in the course of the temperature rise, not only directly affect the performance and life of the battery, there is a potential safety hazard. In this paper, a pure electric vehicle with a lithium-ion battery pack with no heatsink, through testing and without thermal simulations with a model feasibility analysis.

Abstract: what the cheaper and easier to get is graphene to replace high cost, limited sources of material and high temperature difference between the ITO (indium tin oxide) electrode material as a quantum dot solar cells is the focus of this study. This study used a chemical vapor deposition (CVD) production of graphene electrode explore the relationship between the transmittance and the graphene sheet resistance graphene layers; then make a graphene material as an electrode of the solar cell devices of different size and detecting its performance, the conclusion that the material is graphene electrode PbSe / CdSe quantum dot battery, which can effectively improve the conversion rate of the quantum dot solar cells (up to 3.6%), and stability, but also can greatly reduce the cost;

Abstract: The hydrothermal (HT) upgrading of bitumen with glucose, a model compound of biomass, as hydrogen donor was verified. A parametric study of glucose-promoted upgrading of bitumen, under HT conditions was carried out. The results confirmed the positive influence of glucose in the bitumen upgrading via the catalytic hydrogenation reactions. The optimum conditions for bitumen upgrading were: temperature 400 °C, glucose concentration 5 wt%, reaction time 90 min and catalyst amount 0.08 g. A proposed mechanism for bitumen upgrading with glycerin was discussed.

Abstract: Redox electric couple species used in the catholyte of the hydrogen redox fuel cell was screened through the electrochemical testing methods, and the catholyte composition and concentration were optimized by studying the reaction mechanism and laws on different electrodes, then the inside battery structure was also designed. The results showed that when using the carbon felt as electrode, platinum as catalyst, ferric/ferrous ion solution as the most suitable catholyte optimal performance could be obtained. This method can reduce the cathode polarization and the amount of catalysts. It can also solve the problem of catalyst poisoning and membrane degradation, simplify water management, effectively reduce the costs and improve cell performance and reliability.

Abstract: Using multi reference configuration interaction (MRCI) method, with aug-cc-pV5Z, aug-cc-pv6z, aug-cc-pcv5z, aug-cc-pcv6z basis sets etc., the single point energy of the ground state and the first excited state and second excited state of C^-₂ are calculated. Then LEVEL program is used to fit out the spectroscopic constants of three states. Results obtained by MRCI/aug-cc-pcv5z-dk method are close to the experimental values.