TiO2/α-Fe2O3复合光催化剂的制备及表征

用溶胶-凝胶法在α-FeOOH上负载TiO2,经过煅烧制备了TiO2/α-Fe2O3光催化剂.用Brunauer-Emmett-Teller(BET)法测试氮吸附比表面积.用X射线衍射、透射电镜、扫描电镜、Fourier转换红外光谱等研究了不同煅烧温度制备的光催化剂物相组成和形貌特征.研究了不同煅烧温度制备的光催化剂对活性艳蓝X-BR染料的吸附和光催化性能.结果表明:与未负载TiO2的α-FeOOH相比,经过复合、350℃煅烧制备的TiO2/α-Fe2O3复合材料的比表面积有了显著增加,从35.4m2/g增加到167.7m2/g,但是,当温度高于450℃时,其比表面积又有所下降.随着煅烧温度的增加,其负载的TiO2晶型由锐钛矿转变为金红石型,粒径也逐渐增大.在煅烧温度为350℃时,TiO2/α-Fe2O3催化剂吸附和光催化性能最好,脱色率可达到85.19%.     

加氢工艺技术生产25#变压器油

以江苏常二线油为原料,通过加氢微型试验装置,筛选出加氢精制催化剂3996、FV-1,将上述2种催化剂按照1：1（体积比）进行组合装填,进行一段加氢法生产25^#变压器油试验取得成功,并经过了工业生产试运行。结果表明,在适宜的操作条件下,可以利用原白油加氢装置生产出合格的25^#变压器油产品,优化了装置产品结构,提高了装置创效能力。     

稀土与L-酪氨酸甘氨酸三元固态配合物的合成与表征

在乙醇溶液中合成了四种稀土与 L-酪氨酸、甘氨酸的三元固态配合物 RE( Tyr) 1.5 ( Gly) 4 ( Cl O4) 3( RE=La3+、Ce3+、Gd3+、Y3+) ,并通过摩尔电导、热分析、红外光谱等进行了表征。     

Wind turbines equipped with fractional‐order controllers: Stress on the mechanical drive train due to a converter control malfunction

This paper is on variable‐speed wind turbines with permanent magnet synchronous generator (PMSG). Three different drive train mass models and three different topologies for the power‐electronic converters are considered. The three different topologies considered are respectively a matrix, a two‐level and a multilevel converter. A novel control strategy, based on fractional‐order controllers, is proposed for the wind turbines. Simulation results are presented to illustrate the behaviour of the wind turbines during a converter control malfunction, considering the fractional‐order controllers. Finally, conclusions are duly drawn. Copyright © 2010 John Wiley & Sons, Ltd.     

大系统分解协调在库群防洪优化调度中的应用

文章介绍了大系统分解协调理论,建立了串联、并联库群水库防洪优化调度模型.以澧水流域并联系统为例进行了优化调度计算,并以常规调度方案成果进行了分析比较论证.     

水资源优化配置调度系统信息传输通道建设

监测站分中心省中心图1信息传递流程示意图2传输通道建设本系统设分中心站2个(鞍山水文分局、辽阳水文分局),端站16个。超短波电台采用进口专用数传电台,工作频率段为国家无委专为水利系统批准的230MHz数传频点。辽宁中部地区的水系主要包括辽河干流、浑河、太子河、大辽河、绕     

Effect of <Emphasis Type=Italic>d</Emphasis>-metal hydroxides on water dissociation in bipolar membranes

Methods of electrochemical impedance, voltammetry, and ion transport numbers are used to study bipolar membranes that contain hydroxides of transition metals on the bipolar boundary. It is shown that the introduction of hydroxides significantly increases the rate of water dissociation in bipolar membranes, and the catalytic activity of transition metal compounds depends on the nature of the metal. It was found that the pseudounimolecular rate constants of the rate-limiting steps of dissociation calculated from the thermodynamic and kinetic data are two orders of magnitude higher than the effective constants derived from experiment. This suggests that only a small fraction of the surface of metal hydroxide particles is in the space-charge region (bipolar region), in which the dissociation of water molecules occurs in high-intensity electric fields.