恩施州劳务输出效应分析

结合实际情况和数据资料,分析了恩施州人口与劳动力现状、农村劳动力输出的情况,研究结果显示:农村剩余劳动力转移与区域经济增长明显正相关,对农民人均收入和GDP增长发挥着重要作用.     

2.5 G ATM IP宽带测试接口的研制

实现了国内首例全面实现2．5G ATM／POS、GE、FE的宽带网络测试接口的研制．测试接口采用一种产生分析模块，支持多种接口模块，之间使用标准接口连接，主要发送和分析逻辑采用FPCA(Field Programmable Gate Array)实现，对外通讯接口是以太网口．采用实时操作系统，进行系统的初始化配置等以及与终端的通讯．系统集成度高，控制灵活，易于软件和逻辑升级．     

Research and Application of All-Position Automatic Welding Machine

The all-position automatic welding machine system is the special welding system for pipeline girth automatic welding on site, which has been widely used in the long distance pipeline construction projects due to the advantages of automatic control for welding parameters at all position, moving speed of bugs and operating. This automatic pipeline welding system has been successfully used in several main pipeline projects in China, and has been approved by the constructors with the benefits of higher quality passing rate, higher welding efficiency and lower labor intensity.     

Non-Monomial Permutations with Differential Uniformity Six

In this paper, a family of non-monomial permutations over the finite field \({F_{{2^n}}}\) with differential uniformity at most 6 is proposed, where n is a positive integer. The algebraic degree of these functions is also determined.     

Fabrication of homogeneously dispersed graphene/Al composites by solution mixing and powder metallurgy

Graphene-reinforced aluminum (Al) matrix composites were successfully prepared via solution mixing and powder metallurgy in this study. The mechanical properties of the composites were studied using microhardness and tensile tests. Compared to the pure Al alloy, the graphene/Al composites showed increased strength and hardness. A tensile strength of 255 MPa was achieved for the graphene/Al composite with only 0.3wt% graphene, which has a 25% increase over the tensile strength of the pure Al matrix. Raman spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and transmission electron microscopy were used to investigate the morphologies, chemical compositions, and microstructures of the graphene and the graphene/Al composites. On the basis of fractographic evidence, a relevant fracture mechanism is proposed.     

TTAC-HPMo/SiO_2催化剂的表征及其氧化脱硫性能分析

以十四烷基三甲基氯化铵(TTAC)为模板剂,正硅酸乙酯(TEOS)为硅源,采用溶胶-凝胶法制备TTAC-HPMo/SiO_2催化剂,利用FTIR、XRD、SEM和N_2吸附-脱附等技术对其进行表征,并分析催化剂制备条件和反应条件对模型油氧化脱硫性能的影响。结果表明,在m(HPMo)/m(SiO_2)=15%、焙烧温度为400℃条件下所制TTAC-HPMo/SiO_2催化剂,其孔隙结构发达、氧化脱硫性能最佳;对于10mL以二苯并噻吩(DBT)为目标含硫化合物的模型油(硫含量为400μg/g),当m(TTAC-HPMo/SiO_2)/m(模型油)=0.43%、V(H_2O_2)/V(模型油)=0.2%、反应温度为60℃、反应时间为14min时,所制TTAC-HPMo/SiO_2催化剂对模型油中DBT的脱除率达到100%。     

高速水润滑止推轴承的滑移润滑性能研究

建立了多种具有不同滑移区域分布特征的推力瓦数学模型,在考虑流体边界滑移效应、扩展了经典Reynolds方程并设定合理边界条件的基础上,借助MATLAB软件对模型进行数值仿真求解,研究了滑移区域分布方式、面积占比及滑移长度对轴承动压润滑性能的影响。结果表明,在靠近流场入口处沿周向分布滑移区域能显著提升不同转速条件下的推力瓦面承载力;当滑移区域面积占瓦面面积比介于0.3~0.4且滑移长度为1000nm时,轴承推力瓦面具有最优动压润滑性能。     

Alkaline digestion behavior and alumina extraction from sodium aluminosilicate generated in pyrometallurgical process

In pyrometallurgical process, Al-and Si-bearing minerals in iron and aluminum ores are easily transformed into sodium aluminosilicates in the presence of Na₂O constituents, which alters the leaching behaviors of Al₂O₃ and SiO₂. It was confirmed that sodium aluminosilicates with different phase compositions synthesized at various roasting conditions were effectively digested in the alkaline digestion process. Under the optimum conditions at temperature of 100-120℃, liquid-to-solid ratio (L/S) of 10:2 mL/g, caustic ratio of 4, and Na₂O concentration of 240 g/L, the actual and relative digestion ratio of Al₂O₃ from the synthesized sodium aluminosilicates reached maximums of about 65% and 95%, respectively, while SiO₂ was barely leached out. To validate the superior digestion property of sodium aluminosilicate generated via an actual process, the Bayer digestion of an Al₂O₃-rich material derived from reductive roasting of bauxite and comprising Na_1.75Al_1.75Si_0.25O₄ was conducted; the relative digestion ratio of Al₂O₃ attained 90% at 200℃.     

Deep cleaning of a metallurgical zinc leaching residue and recovery of valuable metals

Huge quantities of zinc leaching residues (ZLRs) generated from zinc production are dumped continuously around the world and pose a potential environmental threat because of their considerable amounts of entrained heavy metals (mainly lead). Most ZLRs have not been properly treated and the valuable metals in them have not yet been effectively recovered. Herein, the deep cleaning of a ZLR and recovery of valuable metals via a hydrometallurgical route were investigated. The cleaning process consists of two essential stages:acid leaching followed by calcium chloride leaching. The optimum conditions for extracting zinc, copper, and indium by acid leaching were a sulfuric acid concentration of 200 g·L-1, a liquid/solid ratio of 4:1 (mL/g), a leaching time of 2 h, and a temperature of 90℃. For lead and silver extractions, the optimum conditions were a calcium chloride concentration of 400 g·L-1, a pH value of 1.0, a leaching time of 1 h, and a temperature of 30℃. After calcium chloride leaching, silver and lead were extracted out and the lead was finally recovered as electrolytic lead by electrowinning. The anglesite phase, which poses the greatest potential environmental hazard, was removed from the ZLR after deep cleaning, thus reducing the cost of environmental management of ZLRs. The treatment of chlorine and spent electrolyte generated in the process was discussed.     

基于全社会成本评估的输煤输电经济比较

分析了输煤和输电全社会成本的构成,将系统投资成本、燃料成本、环境损失成本、可靠性成本之和定义为全社会成本,并提出输煤和输电全社会成本的评估框架,根据单位供电量的全社会成本进行输煤输电经济比较.已有的系统运行模拟方法计及了机组组合优化模型和安全约束经济调度模型,可以详细评估输煤和输电每一时段的燃料成本、环境损失成本和可靠性成本.评估了输煤与特高压直流输电的具体算例,详细分析了输电线路年利用小时数、环境损失成本和可靠性成本对输煤和输电经济比较的影响.结果表明在输煤输电的比较中,考虑可靠性和环境因素是非常必要的.