用TOA为流动载体的乳状液膜提取对氨基苯磺酸

研究了以三辛胺(TOA)为流动载体的乳状液膜法提取对氨基苯磺酸(PASA)的最优膜配方及工艺条件.结果表明:以3%聚胺型表面活性剂(质量分数),4%TOA(体积分数),10%NaOH(质量分数),油内比Roi为2∶1的乳状液膜体系,处理初始浓度为5 000 mg/LPASA废水,在pH值为3,乳水比Rew为1∶5的传质条件下,提取率可达90%以上.     

用正交设计研究PVDF印VC／PMMA共混中空纤维膜

制备了PVDF（聚偏氟乙烯）／PVC（聚氯乙烯）／PMMA（聚甲基丙烯酸甲酯）三元共混中空纤维膜，讨论了影响膜性能的主要因素．正交实验结果表明：在PVDF／PVC／PMMA体系中，聚合物总浓度是影响膜的水通量的主要因素；PVDF浓度对膜强度影响最大；PMMA对膜的亲水性有较大的贡献．得到优化的制膜条件为：铸膜液中PVDF：PVC：PMMA=7：1．2：1．8（质量比），聚合物溶质的总质量分数为17％；添加剂吐温-80的质量分数为6％．     

橘核中橙皮苷含量的高效液相色谱法测定研究

目的建立橘核中橙皮营含量的测定方法,为橘核的质量评价与控制提供科学依据。方法采用HPLC法进行测定。色谱柱：KromasilC18色谱柱（250mm×4．6mm,5μm）;流动相：甲醇-36％（体积分数）乙酸-水（体积比38：2：60）;流速：1．0mL·min-1;检测波长：285nmi柱温：25℃。结果橙皮苷在0．103～2．060μg范围内线性关系良好,r=0．9999,平均回收率为95．87呶n=6）,RSD=2．46％,3批橘核中橙皮苷含量介于0．1～0．2mg·g-1之间。结论该方法简便、准确,可作为橘核中橙皮苷的定量分析和质量控制方法。     

乳状液膜法分离提取Cu2+

研究了以Ｌｉｘ９８４为流动载体的乳状液膜法分离提取低吕位蓝铜矿浸出液中Ｃｕ＾２＋，考察了各种因素对Ｃｕ＾２＋分离提取率的影响。结果表明，由Ｌｉｘ９８４（体积分数６％）、ＥＣＡ４３６０Ｊ（体积分数５％）和磺化煤油组成的膜相，３ｍｏｌ·Ｌ＾－１ＨＣｌ为内水相，浸出液ｐＨ值为３￣６，油内比Ｒｏｉ－１：１，乳水比Ｒｅｗ－１：５，提取时间６ｍｉｎ后，Ｃｕｚ＾２＋提取率几近１００％，纯度可达９９％以上，富体浓     

研究RP-HPLC法测定藿香正气片中橙皮苷的含量

目的建立藿香正气片中橙皮营的含量测定方法。方法采用C18色谱柱（200mm×4．6mm,5μm）,流动相为甲醇-冰醋酸-水（体积比35：4：61）,流速：1．0mL／min,检测波长：283nm。结果橙皮苷在0．0895～0．716μg之间与峰面积积分值呈良好的线性关系,平均回收率为99．16％,RSD=1．85％（n=6）。结论建立的方法简便、准确,可用于藿香正气片的质量控制。     

固相萃取-高效液相色谱法测定水中邻苯二甲酸酯类的方法研究

建立了固相萃取-高效液相色谱法测定水中5种邻苯二甲酸酯类的方法。通过正交实验确定了固相萃取的最优化条件：洗脱剂组成（乙醚：甲醇）19：1,洗脱速率1．0mL／min,洗脱体积9mL,清洗剂组成（甲醇：水）1：19。液相色谱的最佳条件：检测波长224nm,流速1．0mL／min,采用梯度洗脱,开始时甲醇-水（75：26,V／V）,保持6min,第7min甲醇比例上升到100％。结果,5种物质峰面积对浓度进行线性回归的相关系数均大于0．9992,该方法的最低检出限在（0．01～0．07）pg／L之间,加标回收率82．1％～97．4％,相对标准偏差（RSD）1．1％～2．4％。     

乳状液膜法提取赖氨酸

研究了用乳状液膜法提取赖氨酸的液膜配方及一些重要操作参数 ,初步得出了既能相对减少溶胀 ,又能保持较高分离效率的膜组成及最佳工艺条件 .赖氨酸提取的液膜组成为 :载体二 - (2 -乙基己基 )磷酸脂 7% (质量分数 ) ,表面活性剂 (Span - 80 ) 5 % (质量分数 ) ,膜溶剂 5 0 % (体积分数 )液体石蜡和 5 0 %煤油 .内相选用 0 .5mol/L的HCl溶液 ,处理比为 3.75 ,提取率可达 72 .6 %     

研究小儿清热利肺口服液中总绿原酸含量的测定方法

目的建立反相高效液相色谱法测定小儿清热利肺口服液中总绿原酸的含量。方法采用DiamonsiLTMC18（250mm×4．6mm,5um）色谱柱,乙腈体积分数0．4％H3P04水溶液（体积比10：90）为流动相,流速为1mL·min-1,检测波长为327nm,柱温为30℃。结果绿原酸在质量浓度为16．28-81．4μg范围内线性关系良好（r=0．9996,n=5）,样品平均回收率为100．31％,RSD为1．45％。结论本法简便、快速、准确,适用于小儿清热利肺121服液的质量控制。     

液膜法去除废水中的氨氮污染

研究了用乳状液膜法去除废水中的氨氮污染．选择了液膜体系，考察了各种因素对氨氮去除率的影响．结果表明，由表面活性剂、民用煤油及膜增强剂组成的膜相，稀硫酸的质量分数１０％的内相组成的液膜体系，当乳水比ＲｅＷ＝１∶１０、接触时间为８分钟时，可使氨氮含量在１０００ｍｇ／Ｌ以上的废水，一级去除率达９７％以上，处理后的废水符合排放标准     

研究HPLC法测定红霉素明胶微球的含量

目的建立红霉素明胶微球中红霉素含量的测定方法。方法采用高效液相色谱法,色谱柱为DIKMA C18色谱柱（5μm,250mm×4．6mm）,流动相为0．1mol／L磷酸二氢铵（三乙胺调节至pH6．5）乙腈（体积比67：33）,流速lmL／min;检测波长210nm。结果红霉素质量浓度在0．0992～0．4960mg／mL范围内与峰面积呈良好线性关系,r=0．9999;平均回收率为100．1％,RSD=0．95％（n=9）。结论本文方法可用于红霉素明胶微球的含量检测。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.