Applied Mechanics and Materials Vol. 700

Abstract: The different preparation conditions of TiO₂ and NV co-doped TiO₂ prepared by the sol-gel method were evaluated through the SO₂ photocatalysis removal efficiency and continuous utilization time under the visible light. Results showed that the SO₂ removal reactions included adsorption and photocatalytic oxidation which was obvious for the NV co-doped TiO₂ ; its continuous utilization time and removal efficiency reached 420min and 98.76% which was higher than that of TiO_{2 ,}N- TiO₂ and V- TiO₂ when the co-doping of N and V, the calcining temperature was 500 °C by 3h and pH was 3.5 with the microwave by 23min.The XPS and XRD analysis indicated that coexisting V⁴⁺and V⁵⁺ ,microwave drying, calcination temperature and mixture of anatase and rutile strongly affected the desulfurization photocatalytic activity of NV co-doped TiO₂.

Abstract: A novel O-P-O bridged [Mn (3-MeOsalen)·H₂O] (3-MeOsalen = N,N'-ethylenebis (3-methoxysalicylideneiminato) dianion) chain compound, namely [Mn₂(3-MeOsalen)₂(O₂PPh₂)(H₂O)₂] [Mn (3-MeOsalen)(H₂O)₂]·(ClO₄)₂·(H₂O)₄ (1) is successfully synthesized and structurally characterized. Compound 1 crystallized in monoclinic, space group P2₁/c. This compound consists of two fragments, the dinuclear cationic unit [Mn₂(3-MeOsalen)₂(O₂PPh₂)(H₂O)₂]⁺, which is resulted from O-P-O bridged cationic unit [Mn (3-MeOsalen)·H₂O]⁺, and mononuclear unit [Mn (3-MeOsalen)(H₂O)₂]⁺, forming an one-dimensional chain by intermolecular hydrogen bonding and strong π-π stacking.

Abstract: CIGS thin film solar cells on polyimide substrate was a significant developmental direction of solar cells and fabricating high quality CIGS thin film in low temperature was its pivotal technology. The development of manufacturing the CIGS thin film solar cells on polyimide substrate in low temperature was described. The specific principle, manufacturing technique and application prospect were also involved. The problem should be solved in the future progress of CIGS thin film on polyimide substrate was illustrated.

Abstract: Poor energy output and high cost are the key factors to inhibit the development and application of microbial fuel cells (MFCs). Different types of modification techniques for anode material are suggested to improve power performance in MFCs. nanoFe₂O₃ is characteristics of no toxicity, biocompatibility and low cost. In this work, stainless steel mesh (SSM), ultracapacitor activated carbon with SSM (AcM), Fe₂O₃ added AcM (AMF) anodes are investigated to improve MFCs performance. The highest maximum power density (806 ± 26 mW·m^-2) is obtained in AMF anode, which is 11 % higher than that of AcM (730 ± 27 mW·m^-2), and 57 folds higher than that of SSM anode (12 ± 0.7 mW·m^-2). The semi-conducting properties of passive film on the anode surface play a rather important role in anodic reaction by Mott-Schottky analysis. Tafel test demonstrates that the exchange current density (8.36×10^-4 A·m^-2) is improved by 20 % for AMF compared with AcM control (6.93×10^-4 A·m^-2). These results show AcM is suitable as MFCs anode, and further addition of Fe₂O₃ can increase the extracellular electron transfer in that way increase power production in MFCs.

Abstract: Using the finite-time thermodynamics, an irreversible cycle model of the Stirling refrigeration-cycle, using a ferroelectric material as the working substance, is established. Several irreversibilities due to thermal resistances between the working substance and the heat reservoirs, regenerative losses in two regenerative processes are taken into account. The influence of these irreversible losses on the performance of the ferroelectric Stirling refrigeration-cycleis analyzed. The thermoeconomic optimization for ferroelectric Stirling refrigeration-cycle is reported. The cooling load for the refrigerator per unit total cost is proposed as objective functions for the optimization. The optimum performance parameters which maximize the objective functions are investigated. Since the optimization technique consists of both investment and energy consumption costs, the obtained results are more general and realistic.

Abstract: As one of promising "last mile" scheme for broadband access network, Fiber-Wireless (FiWi) access network has the advantages of high capacity, long distance, low cost etc because it is the integration of optical back-end and wireless front-end. At the same time, energy consumption of FiWi access network is an important factor that limits the development of networks. A number of ONU sleep states such as ONU power shedding state, ONU doze state, ONU deep sleep state and ONU fast sleep state have been proposed to obtain low-power ONU state, which indirectly reduce energy consumption of networks. However, these low-power states of ONU are born to coordinate to green Passive Optical Network (PON), of which the function of ONU is different from FiWi. In this paper, two low power ONU sleep mechanisms called Static ONU Sleep (SOS) mechanism and Dynamic ONU Sleep (DOS) mechanism, respectively, are proposed and embedded into FiWi access network. By simulation and analysis based on OPNET 14.5, this paper shows that the DOS mechanism has a better performance than SOS, and both of them can save energy of FiWi access network.

Abstract: The paper uses the microbubble flotation device made by ourselves to clean the water in the Dianchi Lake, the microbubble is produced by electrolysis, the testing and results analysis showed that shortening the distance of electrodes and adding a little amount of electrolyte can effectively reduce energy consumption. Excessive pursuit of the treatment effect is not conducive for reducing energy consumption. An optimization of the current density and processing time is important. It provides good valuable reference for microbubble flotation water treatment.

Abstract: Air source heat pump hot water system is a kind of high efficient energy saving technology model, and it has no pollution to the environment. In this paper, a bathroom of one college in Panzhihua area is researched as a project example, and the working principle of air source heat pump hot water system is introduced, furthermore, the system benefit is analyzed. The result proves the air source heat pump hot water system has good economic benefits, energy saving and environmental protection benefits, and it has a broad development space and application prospect in building energy saving.

Abstract: Under the energy structure dominated by coal in China at present, the development of electric vehicles is the best way to deal with the problems of energy, environment, climate change and sustainable development and the best choice to make the auto industry change from big country to powerful country. So far, driving mileage is still the bottleneck to restrict the pure electric vehicle commercialization. Making full use of the realization of finite energy source and improving the efficiency of the driving system and the regenerative braking are the urgent problems to be solved. Regarding to the dual-requirements for high-energy density and high-power density, the dual-energy storage system is designed to be a composition of battery and ultra-capacitor plus bi-direction DC/DC converter in parallel. The main-loop circuit of the dual-energy storage system is constructed, and the working states are analyzed.

Abstract: This paper used data envelopment analysis (DEA)-Malmquist index method to analyze the total factors energy productivity (TFEP) and efficiency of 16 cities in the Yangtze Delta region from the year 2008 to 2012. According to the computational results, the average TFEP of 16 cities during 1998-2012 is 0.978, and the average total factor energy efficiency (TFEE) is 1.011, while the average total factor energy technological change (TFTC) is 0.969. So the rapid drop of TFEP is mainly ascribable to the rapid drop of TFTC in the Yangtze Delta region. Specific to different cities and different period, there exists significant inequality catch-up effect and innovation effect in the Yangtze Delta region. In which, the catch-up effect of Nanjing, Suzhou, Yangzhou, Changzhou, Zhenjiang, Nantong, Taizhou1 and Jiaxing is evident, while the innovation effect of Shanghai, Nanjing, Suzhou, Wuxi and Zhoushan is more significant.