Advanced Materials Research Vols. 347-353

Abstract: The protonation process, the adsorption equilibrium process, the adsorption isotherms and the adsorption kinetics of adsorbing Ca(II) and Mg(II) onto Lewatit MonoPlus TP 207 and TP 208 chelating resins were studied using the pH titration method and batch experimental method. By omitting the ionic charges, first protonation constants, second protonation constants and equilibrium constants were determined. The adsorption behaviors were found to be dependent on contact time, pH, temperature and initial concentrations. The experimental adsorption isotherms were fitted using both the Freundlich and Langmuir models. The adsorption kinetics was described by means of the pseudo-first-order and pseudo-second-order kinetic models. The adsorption mechanism was found to involve intra-particle diffusion and film diffusion, where both were found to be the rate control steps.

Abstract: This paper took hybrid electric bus and battery electric bus as research subjects, built lifecycle cost model based on purchase cost and using cost, calculated well-to-wheel carbon dioxide emission based on GREET model, analyzed current situation and foreground of new energy buses compared with conventional diesel bus. The results shows hybrid electric bus has advantages on cost and emission in the coming decade. While lifecycle cost of battery electric bus is too high today, and the cost in the future depends on battery technology development.

Abstract: This paper presents a fuzzy-logic-controlled boost DC/DC converter for photovoltaic (PV) system . The tracking algorithm changes the duty ratio of the converter such that the PV model voltage equals the voltage corresponding to the MP point at that solar insolation. The main difference between the method used in the proposed MPPT system and other techniques used in the past is that the MPPT method is fuzzy based and is used to directly control the dc/dc converter, thus reducing the complexity of the system. The proposed fuzzy tracking effectiveness is demonstrated through the simulation results, and are compared with the conventional controller based system.

Abstract: The sodium alginate fossilization Sphingomonas strains have double features: the biological absorption and biological degradation. And through using them to remove COD in the seawater we can see the pH value has highly significant impact on the removal rate, in addition, when the temperature is 37°C, pH value is 7.0, the pellet concentration is 1.0 g/L, the rotating speed is 120 r / min and oscillate for 90 min, the removal effect is the best. Pure strains, embedding micro-organisms have better removal efficiency of COD, indicating that microbes play a major role on the removal of COD, and microbial removal efficiency is the best after cultivated for 24 h, for microorganism is in the strongest logarithm phase at that time. However, the adsorption of COD mainly comes from functional groups on the surface of sodium alginate adsorption. The removal rate of COD in seawater treated by immobilized thallus can reach 86%, and can reach Class Ⅱseawater quality standards after purified. The study has the features of maintaining the multi-enzyme system of microbial cells, having less effect on microbial activity and also having obvious treatment effect; furthermore, its operation is simple, it requires less equipment and with lower prices.

Abstract: This study use purely bacteria on suitable condition, eliminate other bacteria come in life-form bacteria. Through the orthogonal experiment obtains the optimum condition of sodium alginate fossilization Sphingomonas strain pellet to nickel bioremediation, and discusses the influence of single factor to the sodium alginate fossilization Sphingomonas strain pellet to nickel adsorption, including the time, the temperature, pH, the initial adsorbent density, the speed of the shaker, the absorbent which the different periods of growth bacterium does, coexistent ion, desorption. From the research, we know the maximum adsorption rate to nickel is about 85%. Dynamics research indicated that in the several methods of the sodium alginate of nickel, the methods of embedded micro-organisms embodies much advantages ,as operating easily, effecting clearly, less pollution, costing low, etc.

Abstract: In the fully mechanized working face, with working face forward, gob area become bigger and bigger, when the top area reach a certain span ,roof in gob suddenly cave, outspreading a large quantity of mine gas, easy to cause the gas overrun and gas accidents. In addition, shock pressure which is caused when large area roof cave, easily causing casualties and damage of equipment. This paper introduces Pan three Coal mine 17171(1) ore advance of fully mechanized working face presplit blasting, rotating stoping and comprehensive extraction technologies, which successfully solve the roof management and the gas problems during initial release, achieving good security benefits.

Abstract: ZrO2 nano-particles were successfully prepared by supercritical hydrolysis in two steps (hydrolysis and dehydration) and were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and laser particle-size analyzer. The influences of operation parameters, including operation pressure and temperature, CO2 total flow and ratio of CO2 branch flow, on the particles were investigated experimentally. The results show that average particle size increases with the increase of the operation temperature, while it decreases with the increase of the operation pressure and the CO2 total flow. The smallest particles with average diameter of 793nm can be prepared under the condition: operation temperature and pressure of 50°C and 8MPa, CO2 total flow of 30 standard cubic centimeter per Minute and ratio of CO2 branch flow of 3.

Abstract: Thermal management technique is one of the key techniques for the vehicle application of lithium-ion power batteries. Based on the analysis of thermal characteristics of the lithium-ion power batteries, the establishment of thermal model and numerical simulation for the lithium-ion power batteries were discussed. Finally, a procedure for designing battery thermal management system (BTMS) was proposed, and the key techniques during designing a BTMS were studied, including selection of heat transfer medium, design of cooling/heating structure and so on. This research provides a technique support for designing a good and effective BTMS, as well as improving the working performance and security of the lithium-ion power batteries and the electric vehicles.

Abstract: All kinds of factors affecting the efficiency of three phase asynchronous motor are studied, the methods of energy-saving and efficiency improvement of flame proof three phase asynchronous motor for fan are analyzed form the aspect of calculation of electromagnetism, selection of material, design of wind path, machining process etc, the practical optimizing methods are put forward and are verified through the product. The experiment show that the efficiency of the motor designed according to this method has improved greatly. So these methods provide some reference for the design of flame proof three phase asynchronous motor for fan. Other methods that could be used to saving energy are also analyzed in theory in the paper, which offer some reference for the enterprise using mining flame proof fan to seek the method of energy-saving and efficiency improvement.

Abstract: A type of zirconium-organic cross-linking agent with excellent temperature resistance and delaying performance was prepared for acid fracturing fluid system. The factors influencing on the synthetic process of the zirconium-organic cross-linking agent were investigated and the optimum condition was obtained: 5% zirconium oxychloride, 20% ligands, reaction temperature 50~55°C, reaction time 4.0~5.0h. Then the best technology for zirconium-organic cross-linking agent and the laboratory evaluation for the acid fracturing fluid system were studied. The results showed that using the cross-linking agent can obviously improve the temperature resistance, delaying performance and the shearing resistance of the acid fracturing fluid system. Meanwhile, the zirconium-organic cross-linking agent had excellent gelout performance and sand-carrying performance, which can satisfy the fracturing operation requirement for the reservoirs below 100°C.