基于神经网络的氢氧化铝焙烧优化控制系统

采用OPC(OLE for Process Control)技术架构了三层模式的过程优化控制系统,实现了优化控制系统与现有PLC系统的数据通讯、信息共享.优化控制系统由FLUENT仿真分析、过程智能建模、流程理论分析和优化控制四大模块组成.主要模块采用神经网络架构,实现复杂炉况的系统辩识以及工艺参数的优化计算.生产应用表明:该系统具有很好的指导性,能稳定生产、优化操作,为节能和降废的整体优化提供了新手段和途径.     

Electrolysis expansion performance of semigraphitic cathode in [K3AlF6/Na3AlF6]-AlF3-Al2O3 bath system

The electrolysis expansion of semigraphitic cathode in [K₃AlF₆/Na₃AlF₆]-AlF₃-Al₂O₃ bath system was tested by self-made modified Rapoport apparatus. A mathematical model was introduced to discuss the effects of α _CR (cryolite ratio) and β _KR (elpasolite content divided by the total amount of elpasolite and sodium cryolite) on performance of cathode electrolysis expansion. The results show that K and Na (potassium and sodium) penetrate into the cathode together and have an obvious influence on the performance of cathode electrolysis expansion. The electrolysis expansion and K/Na penetration rate increase with the increase of α _CR. When α _CR=1.9 and β _KR=0.5, the electrolysis expansion is the highest, which is 3.95%; and when α _CR=1.4 and β _KR=0.1, the electrolysis expansion is the lowest, which is 1.28%. But the effect of β _KR is correlative with α _CR. When α _CR=1.6 and 1.9, with the increase of β _KR, the electrolysis expansion and K/Na penetration rate increase. However, when α _CR=1.4, the electrolysis expansion and K/Na penetration rate firstly increase and then decrease with the increase of β _KR. Foundation item: Project (2005CB623703) supported by the Major State Basic Research and Development Program of China; Project (2008AA030502) supported by the National High-Tech Research and Development Program of China     

Effects of carbon sources on electrochemical performance of Li4Ti5O12/C composite anode materials

Li₄Ti₅O₁₂/C composite materials were synthesized by two-step solid state reaction method with glucose, sucrose, and starch as carbon sources, respectively. The effects of carbon sources on the structure, morphology, and electrochemical performance of Li₄Ti₅O₁₂/C composite materials were investigated by SEM, XRD and electrochemical tests. The results indicate that carbon sources have almost no effect on the structure of Li₄Ti₅O₁₂/C composite materials. The initial discharge capacities of the Li₄Ti₅O₁₂/C composite materials are slightly lower than those of as-synthesized Li₄Ti₅O₁₂. However, Li₄Ti₅O₁₂/C composite materials show better electrochemical rate performance than the as-synthesized Li₄Ti₅O₁₂. The capacity retention (79%) of the Li₄Ti₅O₁₂/C composite materials with starch as carbon source, is higher than that of Li₄Ti₅O₁₂/C composite materials with glucose and sucrose as carbon source at current rate of 2.0C.     

烧结气氛对5Ni/(10Ni-NiFe_2O_4)金属陶瓷物相组成及力学性能的影响(英文)

在不同烧结气氛下采用冷压烧结法制备5Ni/(10NiO-NiFe2O4)金属陶瓷,通过XRD研究其物相组成,SEM研究其显微结构,并用三点抗弯测试和抗热震实验检测其力学性能。结果表明:在真空气氛及氧含量分别为2×10-5、2×10-4和2×10-3的气氛中均可获得Ni/(10NiO-NiFe2O4)金属陶瓷,但气氛中氧含量对物相含量影响较大。在真空气氛中NiO含量相对较高。材料中NiFe2O4和Ni的含量分别随着气氛中氧含量的上升而增加和减小;在真空烧结气氛中,可获得晶粒尺寸为3.90μm的5Ni/(10NiO-NiFe2O4)金属陶瓷,其抗弯强度可达138.59MPa,且在960°C实验条件下平均抗热震循环次数可达6.67次,具有相对较好的力学性能。     

新型Bi_(2)O_(3)/ZnFe_(2)O_(4)光阳极的制备及其光电催化降解有机物性能EI北大核心CSCD

采用化学水浴法制备Bi2O3薄膜,并通过电沉积结合后退火工艺在其表面负载ZnFe2O4进行改性,通过XRD、SEM、Raman、XPS、UV-vis等对Bi2O3样品及Bi2O3/ZnFe2O4复合薄膜进行表征。以制备的薄膜作为光电极,研究其光电化学性能,并首次报道其在光电催化降解有机污染物中的应用。结果表明:ZnFe2O4的复合拓宽Bi2O3的吸光范围,提高光吸收系数,抑制光电化学反应过程中光生载流子的复合,从而使Bi2O3/ZnFe2O4复合薄膜在Na2SO4溶液中的光响应电流密度是纯相材料的4倍左右,AM1.5光照下的光电降解亚甲基蓝性能相比于Bi2O3有明显提高。     

无线城市异构网络下的多模终端发展现状及趋势

无线城市建设热潮和3G时代的到来,为多模智能终端创造了前所未有的发展前景。文章对现有移动终端市场形势和移动终端的发展状况做了详细分析和介绍,并针对3G时代移动通信用户的需求和现有终端存在的主要问题,提出了移动终端发展的变化趋势,指出在3G乃至后3G时代,异构网络融合是通信网络发展的大趋势,而多模终端正是解决异构网络通信的关键。     

Densification of Ni-NiFe204 cermets for aluminum electrolysis

The density of cermet inert anodes in aluminum electrolysis is of great importance. Ni-NiFe2O4 cermets were studied with respect to their densification affected by ball milling time, particle size of raw powders, contents of metallic phase, sintering atmosphere and temperature. The results show that, prolonging ball milling time will increase the density with the optimum value of 150 min; cermets containing 0 - 15 % Ni(mass fraction) have high relative density ranging from 94 % to 96%, but with Ni content increasing, the density slightly decreases; weak reductive atmosphere is favorable to densification; the relative density increases from 80.38% to 96.85% with the sintering temperature increasing from 1 100℃ to 1 300℃ while it decreases at 1 400℃, which may be due to crystal grain coarsening. So the sintering temperature of Ni-NiFe2O4 cerrnets in current work should be controlled at 1 300℃, where the relative density is 96.85 %.     

电力设备绝缘检测技术的研究

在电力系统中,为了保证电力系统的安全、可靠运行,必须保证各种电气设备的绝缘具有一定的电气强度,使其在运行过程中始终保持良好状态。传统的预防性试验和新发展起来的电力设备绝缘在线检测技术就能很好地测量设备的绝缘情况。通过测量,掌握电气设备的绝缘情况,可及时发现并查找设备存在的缺陷及隐患,及时进行相应的维护和检修,以保证电气设备的安全稳定运行。     

基于Domino技术的企业数据交换策略研究

随着网络技术的发展 ,企业加大了在信息基础设施方面的投入。由于历史的原因 ,企业数据一般由文件、关系型数据库、文档型数据库等构成。这些数据的共享与重用性差 ,数据之间的交换困难 ,不利于员工的使用和管理层的决策。提出了一种基于Domino技术的数据交换策略的体系结构 ,用来解决这类问题。这种结构的核心是数据接口和中间件 ,即中间件技术的应用。详细地描述了中间件技术结构设计的四个主要组成部分 :请求管理模块、连接管理模块、操作管理及评价模块、结果缓冲集 ,并提出了在实际应用中系统设计的一种可行的开发工具。     

Preparation of spherical cobalt carbonate powder with high tap density

1 INTRODUCTION Cobalt carbonate is an important intermediate products for preparing battery-grade Co3O4 by liquid chemical precipitation-thermal decomposition method[1?5]. The crystallization and density of cobalt carbonate have an immediate effect on electrochemistry performance of Co3O4. So, it is very important to prepare cobalt carbonate with high density and good crystallization. In the process of preparing cobalt carbonate by liquid chemical precipitation method, it is very easy to…