铜-铬-钼-稀土/二氧化硅及铜-稀土/二氧化硅复合加氢催化剂的研究

在本研究中制备了一系列Ｃｕ－Ｃｒ－Ｍｏ－ＲＥ／ＳｉＯ２和Ｃｕ－ＲＥ／ＳｉＯ２催化剂。研究结果表明：在Ｃｕ／ＳｉＯ２催化剂中,引进Ｃｒ、Ｍｏ和稀土氧化物后能显著延长催化剂寿命。这一结果并用ＸＰＳ光谱对催化剂表面及用ＴＧ对催化剂抗结焦性能进行了分析研究结论为：Ｃｕ－Ｃｒ－Ｍｏ－ＲＥ／ＳｉＯ２和Ｃｕ－ＲＥ／ＳｉＯ２催化剂的负荷比Ｃｕ／ＳｉＯ２催化剂显著提高。     

2,3,4─三羟基─4'─磺基─偶氮苯的电还原及其在电分析中的应用

２，３，４─三羟基─４＇─磺基─偶氮苯的电还原及其在电分析中的应用该文作者为化学系徐茂田和河南师大化学系汪振辉、周漱萍，文章被收录于第２届国际分析化学学术会议论文集《ＴＨＳＥＣＯＮＤＣＨＡＮＧＣＨＵＮＩＮＴＥＲＮＡＴＩＯＮＡＩ．ＳＹＭＰＯＳＩＵＭＯＮ...     

A SIMPLE PROOF OF STABILITY AND CONVERGENCE IN L＿2 FOR SOME DIFFERENCE SCHEMES AND THEIR EXTRAPOLATION METHOD FOR PARABOLIC EQUATIONS

ＡＳＩＭＰＬＥＰＲＯＯＦＯＦＳＴＡＢＩＬＩＴＹＡＮＤＣＯＮＶＥＲＧＥＮＣＥＩＮＬ＿２ＦＯＲＳＯＭＥＤＩＦＦＥＲＥＮＣＥＳＣＨＥＭＥＳＡＮＤＴＨＥＩＲＥＸＴＲＡＰＯＬＡＴＩＯＮＭＥＴＨＯＤＦＯＲＰＡＲＡＢＯＬＩＣＥＱＵＡＴＩＯＮＳＳｕｎＺｈｉｚｈｏｎｇ...     

A MINI－CAPACITANCE PROBE FOR MEASURING THE LOCAL VOID FRACTION IN GAS－SOLID FLUIDIZED BEDS

ＡＭＩＮＩ－ＣＡＰＡＣＩＴＡＮＣＥＰＲＯＢＥＦＯＲＭＥＡＳＵＲＩＮＧＴＨＥＬＯＣＡＬＶＯＩＤＦＲＡＣＴＩＯＮＩＮＧＡＳ－ＳＯＬＩＤＦＬＵＩＤＩＺＥＤＢＥＤＳＧｕｉＫｅｔｉｎｇ（归柯庭）ＨａｎＪｉｔｉａｎ（韩吉田）ＳｈｉＭｉｎｇｈｅｎｇ（施明恒）（Ｄｅ...     

高校图书馆光盘数据库的整理与开发

一、光盘数据库检索的优点 光盘数据库在计算机检索中同传统的纸张手工检索工具相比，具有以下优点。 １．海量存贮信息 一张普通的ＣＤ─ＲＯＭ（Ｃｏｍｐａｃｔ ＤｉｓｃＲｅａｄ Ｏｎｌｙ Ｍｅｍｏｒｙ）光盘最大可存贮６８０ＭＢ（ＩＭＢ＝１０２４Ｂ）字节的信息，可储存近 ２亿个汉字。而 ＤＶＤ—ＲＯＭ更可存贮达４．７Ｇ（ＩＧ＝１０２４Ｍ）字节的信息，可容纳近４０００本图书或７００个高清晰度图片。象我国。最大的北京图书馆的所有图书只需要数张光盘即可容纳全部信息。 ２．检索速度快 随着计算机ＣＰＵ主频的提高及光盘驱动…     

ON THE CONVERGENCE OF GUMMELMAPPING FOR STEADY-STATESEMICONDUCTOR EQUATIONS

ＯＮＴＨＥＣＯＮＶＥＲＧＥＮＣＥＯＦＧＵＭＭＥＬＭＡＰＰＩＮＧＦＯＲＳＴＥＡＤＹ－ＳＴＡＴＥＳＥＭＩＣＯＮＤＵＣＴＯＲＥＱＵＡＴＩＯＮＳＧｕａｎＰｉｎｇ（管平）ＷａｎｇＹｕａｎｍｉｎｇ（王元明）（ＤｅｐａｒｔｍｅｎｔＯｆＭａｔｈｅｍａｔｉｃｓａｎｄＭ...     

TiO_2调变对MoO_3/γ-Al_2O_3和CoO-MoO_3/γ-Al_2O_3表面结构及还原性能的影响

采用气相流动吸附法制ＴｉＯ２／γ－Ａｌ２Ｏ３复合载体,浸渍法担载一定量ＭｏＯ３或ＣｏＯ－ＭｏＯ３．用ＸＲＤ,ＬＲＳ和ＴＰＲ等技术考察了Ｍｏ或Ｃｏ－Ｍｏ催化剂的表面结构和还原性能．结果表明,覆盖在γ－Ａｌ２Ｏ３上的ＴｉＯ２能减弱ＭｏＯ３与γ－Ａｌ２Ｏ３之间的相互作用,明显改善Ｍｏ催化剂的表面结构,促进ＭｏＯ３的还原,适量ＣｏＯ助剂的加入能促进ＭｏＯ３在载体表面的分散．     

山楂光合作用的研究

通过对敞口山楂叶片光合速率的研究表明：（１）Ｐｎ年周期变化为双峰曲线，峰值分别出现在６月中下旬和９月下旬。（２）不同类型枝叶片的Ｐｎ值有明显差异，但其ＰｎＲ ＹＯＷＸＭＡ ＸＧ ＦＱＵ Ｏ ＤＧ ＭＴＤＨＧＡＪＦ，ＵＡ ＥＧ ＸＦＪＳＳＦＣ Ｒ Ｉ ＷＧ     

STUDY OF THE DETECTION ERROR OF A MODIFIED FARADAY CUP IN SOFT VACUUM FOR MEASURING ELECTRON ENERGY SPECTRA

ＳＴＵＤＹＯＦＴＨＥＤＥＴＥＣＴＩＯＮＥＲＲＯＲＯＦＡＭＯＤＩＦＩＥＤＦＡＲＡＤＡＹＣＵＰＩＮＳＯＦＴＶＡＣＵＵＭＦＯＲＭＥＡＳＵＲＩＮＧＥＬＥＣＴＲＯＮＥＮＥＲＧＹＳＰＥＣＴＲＡＬｕｏＺｏｎｇｎａｎ（罗宗南）ＣｕｉＹｉｐｉｎｇ（崔一平）ＣｈｅｎＳｏ...     

Co~(2+)、MoO_4~(2-)在Fe(OH)_3上的吸附行为研究

本文研究了时间、ｐＨ值、温度、盐效应、浓度等因素对Ｃｏ２＋、ＭｏＯ４２－在Ｆｅ（ＯＨ）３上吸附行为的影响，得出了Ｃｏ２＋、ＭｏＯ４２－在Ｆｅ（ＯＨ）３上的吸附行为符合Ｆｒｅｎｄｌｉｃｈ方程，具体表达式为гＣｏ２＋＝１２６Ｃ０．５，ＴＭｏＯ４２－＝２２９Ｃ０．２５。     

Surface treatment of 0Cr19Ni9 stainless steel SMAW joint by plasma melting

Micro-plasma arc surface melting of 0Cr19Ni9 shielded metal arc welding joint with a micro-plasma arc welder produced a thin surface melted layer with a refined microstructure. The surface treatment changed the anodic polarization behavior in 0.5 mol/L H2SO4 solution. The polarization tests showed that for the as-welded joint both the heat-affected zone and the weld metal decreased in resistance to corrosion compared with the as-Received parent material while for the micro-plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.received parent material while for the micro-plasma arc surface melted joint the corrosion resistance increased significantly. This increase in corrosion resistance is attributed to the rapid solidification of the melted layer. Rapid solidification of the melted layer refines its microstructure, decreases its microsegregation, and inhibits the precipitation of chromium carbides at the grain boundaries.     

Testing results analysis of contact materials’electrical contact performance

Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages: smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.     

Testing results analysis of contact materials＇ electrical contact performance

Because of the different ways in which contact materials work, the basic requirements for silver metal oxide contact materials are different. They are anti-welded and anti-erosion when closed, anti-erosion when broken, and arc easily moved and have smaller contact resistance. In this paper, La2O3 is used as a stable oxide in contact material to replace CdO. A new type of Ag/SnO2-La2O3-Bi2O3 contact material is first obtained through using powder metallurgical method. Then electrical contact material parameter tester is used to test the electrical contact performance of the contact material. Through experiments, the arcing voltage and current curves, arcing energy curves, fusion power curves while broken and contact resistance while closed were obtained. Analysis of the results showed that the addition of La2O3 makes the contact material have the following advantages： smaller electrical wear, smaller arc energy, smaller contact resistance and arc is more easily extinguished.     

教学仪器设备的改造——气体保护焊机控制部分的改进与设计

介绍了教学设备NBC系列抽头式气体保护焊机中控制板的改进、设计与实现过程,在保持原焊机控制板功能的前提下,为焊机交流控制、出气机构、送丝装置提供更可靠、稳定的控制信号。同时,确保硬件更简化,实现了＂智能化＂控制,在软硬件方面都做了改进、设计,同时对其他部分进行设计、选型、优化。     

本钢冷轧闪光焊机的工艺原理及参数优化与控制

介绍了本钢冷轧厂闪光焊机的工作原理及基本焊接数据,详细的分析了针对不同规格产品焊机的工艺参数控制与调节,尤其针对冷轧厂超薄规格的BSP短流程的热轧来料,经过大量的焊接实验,从原料、设备、工艺等各个角度进行了全面系统的分析,给出了适合冷轧厂生产的完整焊接工艺参数,从而达到了优良焊接的目的。     

基于Client/Server模式的焊工管理数据库系统

介绍了一个基于Client／Server模式的焊工管理数据库系统，可以完成新焊工的注册、查询及统计等。同时，也设计了多层安全保护机制，实现了焊接工程的网络化，推进了焊接工程数据库的发展和应用。     

New method for capturing arc of moving on switching apparatus

The switching arc that occurs in contact gap when contact of low voltage apparatus closes or breaks in electric circuit is harmful to the contacts, insulation, and reliability of electrical gear because of its very high temperature. As arcing time is very short in switching gear, it is very difficult to observe arc phenomena directly for researchers. Therefore, visualization of switching arc is important for understanding arc phenomena, to analyze the arc features, and to improve the design and reliability of switching gear. Based on analyzing the visualization methods proposed by researchers, a new switching arc capturing approach is introduced in this paper. Arc image acquisition, and image processing techniques were studied. A switching arc image acquisition and visual simulation software based on high speed CCD camera hard ware system was designed and implemented to yield en- hanced arc image with good visual effect.     

On the application of calcium carbide slag as CO2 absorbent

Calcium carbide slag, generated in the hydrolysis process of calcium carbide, is an potential carbon capture reagent because its main ingredient is Ca(OH)2. Calcium carbide slag, a by-product of a resin factory was used as carbon capture reagent. The change of pH and electrical conductivity (EC) of the calcium carbide slag slurry with different solid-to-liquid ratios, as well as the capture efficiency and dynamics under different temperatures and flow rates of CO2 were studied. The properties of solid were characterized with XRD, TG-DTA, SEM and FT-IR before and after capturing carbon. The results show that the change of pH and EC were greater with low solid-to-liquid ratio than that with high solid-to-liquid ratio. The analysis of XRD and SEM show that the content of CaCO3 increased significantly, which improved that Ca(OH)2 and free CaO were reacted with CO2. The results of TG-DTA and FT-IR show that the physicochemical properties and microstructure of the slag changed after capturing CO2 because of the increase of CaCO3 content. All the results mentioned above improve the feasibility of utilizing calcium carbide slag to capture CO2 and offer a practical way for carbon emission reduction and disposal of wasted calcium carbide slag.     

Study on the failure mechanism of Ag-Ce contacts in DC level

Nominal contact resistance, minimum erosion and material transfer are required with low cost materials working in a wide currents range for DC relays. Ag-Ni contact materials have low contact resistance, but the erosion and material transfer are large at high current level. Ag-SnO2 contact materials have good anti-welding properties and resistance to arc erosion, but they have large contact resistance during working and are easily block SnO2 from flocking together on the surface at low current level. In this paper, the failure mechanisms of Ag-Ce contact material were studied. The surface morphologies of the contacts after electrical endurance test for Ag-Ce contact material were compared with that of Ag-Ni and Ag-SnO2 contact materials. The effect of Ce on the surface morphologies of the contacts after electrical endurance test was analyzed.     

Li2CO3-SiO2掺杂对双功能低压SrTiO3基压敏陶瓷性能与工艺的影响

以 L i2 CO3-Si O2 为液相掺杂剂 ,采用一次烧成工艺 ,制备出半导体的 Sr Ti O3基压敏与介电性的双功能陶瓷 .通过电性能与微观结构分析 ,研究了液相掺杂浓度、L i/Si比值及烧结温度对材料性能的影响 .结果表明 ,以 6× 10 - 3mol/L的 Li2 CO3 Si O2 为液相掺杂剂 ,L i/Si=3 /2 ,温度为 13 80℃时 ,在石墨和氮气形成的还原性气氛中烧成的 Sr Ti O3基材料可获得优异的压敏与介电双功能特性