吡唑类化合物的研究Ⅲ.1-苯基-3-羟基-4-苯甲酰基-5-吡唑酮的合成及其性质

合成的标题化合物为新螫合剂。质谱、红外、紫外及元素分析确定了化合物的结构.还测定了酸式电离平衡常数。     

太阳能吸附制冷用复合吸附剂制备及其吸附机理探讨

以乙醇为吸附质，选取13X分子筛、凹凸楱土和氯化锶等为主要吸附材料．通过混合法制备了一系列有着优良吸附能的复合吸附剂。测定了乙醇在主要吸附材料和自制复合吸附剂上的吸附量，用TG-DTA法对主要吸附材料的热稳定性和自制吸附剂DTA脱附乙醇峰端温度进仃了分析.对吸附剂原料复合比例和扩孔剂种类等制备条件进行了实验研究。结果表明：自制复合吸附剂比单一吸附材料对乙醇确着更大的吸附能力；DTA分析的脱乙醇峰端温度明显低于单一吸附材料；加入扩孔剂E1或E2，可增加自制复合吸附剂孔容和孔径，改善其吸附性能；自制复合吸附剂对乙醇的吸附量显著高于活性炭。其中，M4-0003和M1-0001复合吸附剂对乙醇的平衡吸附量约为活性炭的2．5～4倍；M1-0001—乙醇工质对的吸附制冷量是活性炭—乙醇的2～6倍。对吸附剂复合的机理初步探讨表明：增加复合吸附剂弱吸附中心数，可降低其脱附温度。     

PECVD淀积氮化硅薄膜性质研究

使用等离子体增强化学气相沉积(Plasma Enhanced Chemical Vapor Deposition，PECVD)在P型硅片上沉积了氮化硅(SiNx)薄膜，使用薄膜测试仪观察了薄膜的厚度、折射率和反射光谱，利用扫描电子显微镜(SEM)，原子力显微镜(AFM)观察了截面和表面形貌，使用傅立叶变换红外光谱仪(FTIR)和能谱仪(EDX)分析了薄膜的化学结构和成分。最后，考察了薄膜在经过快速热处理过程后的热稳定性，并利用霍尔参数测试仪(Hall)比较了薄膜沉积前后载流子迁移率的变化。     

超临界直流锅炉控制

介绍了超临界直流锅炉的启动系统结构特点,主要功能、,贮水箱水位控制原理和控制模块,阐述了超临界直流锅炉给水控制的概念和控制原理,以及控制回路的相互影响,为超临界机组的运行和调试提供了理论基础.     

城市生活垃圾焚烧发电CDM项目案例分析

本文分析评价了我国城市生活垃圾的产生量、资源量、国内外垃圾焚烧技术应用状况、制约我国城市生活垃圾焚烧技术应用的主要因素以及垃圾焚烧发电技术应用潜力。本研究以城市生活垃圾焚烧发电技术为案例,基于三个基准线,应用增量成本分析方法,计算了垃圾焚烧发电作为CDM(清洁发展机制)项目的单位碳减排成本并对其进行了敏感性分析,提出城市生活垃圾焚烧发电技术应作为我国与发达国家进行CDM项目合作的优先技术领域。     

动态测试中的数据采集在线分析

在工程应用中 ,常常需要对设备进行状态监测 ,这要求对采集的信号进行在线分析 ,动态显示。数据采集和动态测试系统是设备监测的重要环节和故障诊断的基础。本文介绍了一种实用有效的数据采集及实时分析系统 ,它解决了基于WINDOWS操作系统实时信号采集分析的问题。该系统具有多种分析方法 ,功能强大 ,可以在线进行信号分析处理 ,能够同时记录信号的多种特征信息。通过实际使用证明 ,本采集系统具有良好的精度和抗干扰性 ,可应用于内燃机、压缩机等设备的在线监测     

国外空间太阳能热动力发电系统发展及建议

空间太阳能热动力发电系统作为一种新型的空间供电方式，在费用上和性能上已经显示出了很大的优势，有可能成为未来的空间供电方式。国外对于它的研究已经超过40年。通过介绍空间太阳能热动力发电系统的工作原理和技术发展，并且与其它电源系统、主要是光伏系统进行技术比较，显示出这种供电方式的的较大优势。重点介绍了NASA 2kW空间太阳能热动力发电系统地面样机的部件、结构和试验。根据国外研究经验，提出了空间太阳能热动力发电系统研究的建议。     

Fabrication of ZnO/SrTiO3 nanoarrays and its photoelectrochemical performances

The ZnO/SrTiO₃ nanomaterials were fabricated by a chemical conversion hydrothermal method in order to utilize the high electron transfer rate of one-dimensional ZnO nanorods and photocatalytic activity of SrTiO₃. The technological parameters, such as TiO₂ sol concentration, TiO₂ sol dipping cycle, Sr(NO₃)₂ concentration and reaction temperature, were investigated in the synthetic process and the reaction mechanism of the ZnO/SrTiO₃ nanomaterials was proposed. A photocurrent density of 7.53 mA/cm² was obtained for the as-prepared ZnO/SrTiO₃ photocatalyst, attributed to its improved absorption spectrum and appropriate nanostructure, which indicates a potential application in photoelectrochemical water splitting.     

Research on performance of centrifugal pump with different-type open impeller

To investigate the influence of impeller type on the performance and inner flow of centrifugal pump, the numeri- cal simulation and experimental research were carried out on the same centrifugal pump with straight-blade and curved-blade open impeller. Based on SIMPLEC algorithm, time-averaged N-S equation and the standard k-e turbulence model, the numerical results are obtained. The pressure distribution in the different type impellers is uniform, while the low pressure area in straight-blade inlet is larger. The vortexes in the passage of impeller exist in both cases. Relative to curved-blade impeller, there are larger vortexes in most of the flow passages except the passage near the tongue in straight-blade impeller. Also some small backflow regions are found at the blade inlet of two impellers. The characteristic curves achieved by numerical simulation basieaUy agree with those by experiment, and straight-blade open impeller centrifugal pump has a better hydraulic performance.     

TiO2/CdS composite hollow spheres with controlled synthesis of platinum on the internal wall for the efficient hydrogen evolution

Solar driven semiconductor photocatalytic water splitting to produce hydrogen is an extremely charming process by storing photon energy in chemical bonds. In the present study, composite semiconductor TiO₂/CdS was structured into uniform and porous double-shelled hollow sphere with cocatalyst platinum selectively loaded onto the internal wall. The SEM, TEM, STEM, XRD, BET and EDS elemental distribution etc. were employed to evidence the formation of the targeted photocatalyst. It was demonstrated that the material has a high efficiency of visible-light-driven hydrogen evolution (296 μmol·h⁻¹/10 mg) with an apparent quantum efficiency (QE) of 14.5% at wavelength of 420 nm. Comparative experiment analysis and time-resolved infrared absorption study suggested that the high photocatalytic activity of the catalyst is attributed to the vectorial electron transfer (CdS → TiO₂ → Pt) and the spatial separation of reduction and oxidation active surfaces achieved by the special morphology.