Advanced Materials Research Vols. 347-353

Abstract: Ag nanoparticles have been fabricated on the surface of CMK-3 mesoporous carbon through an immersion-electrodeposition (IE) technique. Transmission electron microscopy analysis indicated that it was a facile approach to electrochemically prepare nano-sized Ag clusters. Electrochemical experiments showed that Ag nanoproducts were efficient electrocatalysts for anodic oxidation of formaldehyde in alkaline solutions, and as the reduced of the potential value, the electrocatalytic peak current density for the formaldehyde electro-oxidation reaction was increased gradually. Also, the electrocatalytic activity of Ag/CMK-3 nanocatalysts for formaldehyde electro-oxidation is higher than that of Ag/XC-72 nanocatalysts. These findings represented a significant step toward the implementation of individual Ag/CMK-3 nanocatalysts as anodic materials in fuel cells and sensors.

Abstract: The amount of low temperature heat resources is very huge, efficient utilization that energy is very important issue for improving energy efficiency, saving energy and protecting environment. Due to the small available energy of low temperature heat source, how to improve thermodynamic efficiency is the key problem. In this paper, the thermodynamic model of low temperature thermal power conversion system based on organic Rankine cycle was described firstly. Turbine, single screw and piston expanders were briefly described. R123, R245fa and R134a were chose as working fluid because of quite different critical temperature. Based on this model, the influence of thermodynamic property of organic working fluid on the efficiency of low temperature thermal power conversion system was discussed. The calculating result showed that R123 is the best choice if no considering the impact of expander types and that R245fa is the best choice if considering the impact of expander. This conclusion indicated that it is very important to investigate the match relationship between working fluid and expander. Moreover, single screw expander was proved to be more suitable than turbine and piston expanders for low temperature heat power conversion system.

Abstract: Alkali agents such as magnesium acetate and calcium hydroxide were used for deacidification of aged acidic papers by supercritical carbon dioxide and immersion treatment. In supercritical fluids, the alkali agent can be better combined with the cellulose fibers, and causing similar pH values as immersion; but the mechanical properties of paper will be a biggish increase. According to artificial aging tests, we find the CO2SCF treatment shows better than the immersion one, which would be related to the high level of alkali reserves.

Abstract: The relationship among highway transportation, regional economic and social development is a mutual adaptation and coordinated development, that is, the development of highway transportation system adapts to the needs of regional economy, society to freeway transportation, in order to promote the sustainable development of society. This article makes a deep analysis of the role of highway traffic transportation to economic and social development, points out requirements of economic, and social development to the highway transportation in the different development stages of a country, and puts forward strategic advice for sustainable development of China highway transportation.

Abstract: The nuclear facilities accelerated continuously with the rapid development of the nuclear industry for the increasing demand for energy in China. The nuclear facilities were widely distributed in coastal areas or remote mountainous areas. With the rapid development of the nuclear industry, nuclear fuel cycle system, such as uranium mining and milling, component manufacturing, transportation and disposal of spent fuel, radioactive waste disposal, also would be large-scale distributed, so it is no doubt that the environmental impact would become increasingly prominent and severe. Radionuclides contaminate the environment through the gas, liquid and solid around nuclear facilities, and in case of radioactive leakage, the contamination would affect the soil and public health through food chain. This article aims to establish a nationwide network of early warning detection of radioactivity, the formation of nuclear facilities, radioactive soil around the monitoring and early warning mechanisms, and regularly publish relevant monitoring information, and to study bioremediation of radioactive contaminated soil, to eliminate the public about nuclear discoloration fears and concerns, promote economic and social development , and to keep the nuclear facilities and nature in harmony through environmental protection.

Abstract: Based on the load and heat radiation area are directly influenced by the ratio of piston stroke to cylinder diameter (S/D).An optimized mathematical model is established, with the minimal heat radiation area as the object function and the S/D value as the variable. The optimum results are calculated by using the an Improved differential evolution algorithm method based on 1Stopt.The result shows that this method is of better convergence, high calculation efficiency and consistent with MTU890.

Abstract: This paper describes the 300MW pumped storage governor system which is applied in Xiangshuijian power station and is featured with State-owned independent intellectual property rights from three aspects. Firstly, this paper describes the principle and configuration of the pumped storage governor system; secondly, it describes some features for the application of the system in Xiangshuijian power station and advanced control strategies thereof; and thirdly, it describes the implementation of some special features of application of the system in Xiangshuijian power station. Through this article, we hope for further exploration of the system in the industry and hope the application of the system can be further popularized in the design and implementation of localization governor system of large pumped storage power station in the future.

Abstract: With use of electron-assisted chemical vapor deposition technology, nanocrystalline diamond films were deposited on SiC ceramics substrates at various gas pressure ( 0.5 ~ 2 kPa ). Effect of the gas pressure on optical properties of the nanocrystalline diamond films was studied. Raman scattering spectra were measured. Photoluminescence spectra were investigated in the range of 420 ~ 680 nm. Spectroscopic ellipsometry were analyzed from the near IR to the UV region ( 1.5 ~ 5.0 eV ). Results show that, when the gas pressure increased from 0.5 to 2 kPa, Raman scattering intensity of diamond increase and D/G ratio decrease; when the gas pressure was 0.5kPa and 2kPa, there is not any PL peak, however, there is a stronger PL peak at 485 nm when the gas pressure was 1kPa; extinctive coefficient k for the nanocrystalline diamond films deposited at 1kPa increase obviously with increase of photo energy.

Abstract: The corrosion inhibition of brass in simulated cooling water by complex of triethanolamine (TEA) and Na2WO4 had been investigated by means of electrochemical (AC impedance and dc polarization) techniques. The results indicated that both TEA and Na2WO4 were able to inhibit the corrosion of brass in simulated cooling water. TEA showed the best inhibition effect for brass corrosion at the TEA concentration of 30 mg/L, and the inhibition efficiency was 45.35%. At the total inhibitor concentration of 20 mg/L, the complex of TEA and Na2WO4 had a good synergistic effect, and the optimum ratio of TEA to Na2WO4 is 1:9, corrosion inhibition efficiency was 89.08%.

Abstract: Sn, Al and Cu not only possess electromagnetic interference shield efficiency, but also have the acceptable costs. In this study, sputtered Sn-Al thin films and Sn-Cu thin film were used to investigate the effect of the crystallization mechanism and film thickness on the electromagnetic interference (EMI) characteristics. In addition, the annealed microstructure, electrical conductivity and EMI of the Sn-xAl films and the Sn-xCu films were compared. The results show that Sn-Al film increased the electromagnetic interference (EMI) shielding after annealed. Sn-Cu films with higher Cu atomic concentration, the low frequency EMI shielding could not be improved. After annealing, the Sn-Cu thin film with lower Cu content possessed excellent EMI shielding at lower frequencies, but had an inverse tendency at higher frequencies.