紫外照相技术显现可擦签字笔形成的消退字迹

目的:研究紫外照相技术显现可擦签字笔消退字迹的效果。方法:以可擦签字笔在纸张上形成消退字迹为实验样本,运用紫外照相技术进行检验。结果:紫外照相技术显现可擦签字笔消退字迹效果良好。结论:紫外照相技术为可擦签字笔消退字迹的检验鉴别提供了一种新方法。     

高效毛细管电泳法分析单核苷酸

本文采用高效毛细管电泳(HPCE)探索了单核苷酸的分离最佳条件:柠檬酸——柠檬酸钠缓冲液(PH3.3)为电解液,工作电压-30kv,电流20μA,毛细管长40cm,检测波长260nm,十六烷基三甲基溴化铵(CTMABr)表面活性剂为电解液添加剂。在选定条件下,分析了两个实际样品中的单核苷酸。检测限为1ng/mL。本方法具有速度快、进样量少的特点。     

毛细管电泳法分析盐酸头孢吡肟中N-甲基吡咯烷含量

建立了一种毛细管电泳间接紫外检测注射用盐酸头孢吡肟中的N-甲基吡咯烷(NMP)含量的方法,讨论了检测波长、电压、进样时间、缓冲溶液的pH值等因素对盐酸头孢吡肟中NMP的影响,获得了优化的分离条件.结果表明,以含0.01 mol/L咪唑和1 mol/L的醋酸(pH=4.7)溶液为背景电解质.在电压为3.00kV,检测波长...     

成像检测在DNA毛细管电泳中的应用

本文研究了成像检测方式以及阵列检测器在DNA毛细管电泳的荧光检测中的应用,目的在于减小检测过程引起的样品区带增宽,提高DNA毛细管电泳的分辨率和分离速度。依据分离度理论以及模拟计算结果,归纳了检测宽度的影响规律,指出减小检测宽度对于高效分离,特别是高速微流控系统电泳分离的重要性。实验测量并比较了成像检测与传统光强检测的结果。提出阵列检测器的信号增强方法,并进行了模拟验证。研究表明,成像检测可显著减小毛细管电泳的检测宽度,提高分离效率和分离速度。     

双色互变电子墨水微胶囊的制备以及性能研究

十八胺改性的酞菁绿G和经过改性的TiO2作为显示颗粒配制电泳液,使用明胶-阿拉伯树胶复合凝聚法制备了双色互变的电子墨水微胶囊。通过电镜照片证明,改性以后的酞菁绿G颗粒粒径变小,而且它们在四氯乙烯中的分散性能良好。对电泳液进行微胶囊化处理,电泳颗粒在微胶囊中均匀分散,调节搅拌速度以及SDS等条件,获得了表面光滑,大小均一且无粘连的电子墨水微胶囊。在E=20V/μm电场作用下,电子墨水微胶囊实现了双色互变,微胶囊中的电泳颗粒具有良好的电场响应特性。     

高效毛细管凝胶电泳（HPCGE）中超载进样对蛋白质分离的影响

报导了高效毛细管凝胶电泳在超载情况下样品负荷量与其电泳行为的关系，研究了牛血清白蛋白、伴清蛋白及溶菌酶三种蛋白质的进样量与它们电泳峰形（包括对称性、相对迁移时间和分离度）变化的关系，证实了在样品用量不同时，它们的电泳行为有很大的不同。     

高效毛细管电泳法分析芳族黄酸盐

本文采用高效毛细管电泳(HPCE)法,对几种芳族磺酸化合物进行了分离检测,并比较了正、负电场的分离分析效果。正电场体系的工作电压+25kV,电流23μA,电解液为(NH_4)_2HPO_4—NH_4H_2PO_4;负电场体系的工作电压—20kV,电流50μA,电解液为(NH_4)_2HPO_4—NH_4H_2PO_4—CTMAB表面活性剂。毛细管内径为75μm,有效长度35cm,检测波长210nm。实验结果表明,正电场体系下试样有较为匀称的电泳谱峰,而负电场体系具有快速的优势。     

毛细管区带电泳分离甲酚异构体的研究

本文系统地研究了邻、间、对甲酚三种异构体在毛细管区带电泳中的迁移行为。通过实验研究讨论了缓冲溶液类型、缓冲溶液的pH值、缓冲溶液的浓度和添加剂等因素对三种异构体分离的影响,获得了优化的分离条件。结果表明,在使用未涂层石英毛细管柱(50μm×50cm,有效长度为45 cm),检测波长225 nm,磷酸盐-环糊精-硼砂缓冲溶液浓度30 mmol/L,缓冲液pH值为11.60,分离电压为15 kV的条件下,甲酚三种异构体得到基线分离。     

小肽BCEOC衍生物的非水毛细管电泳分离研究

以1,2-苯并-3,4二氢咔唑-9-乙基氯甲酸酯(BCEOC)作为柱前衍生试剂,采用非水毛细管电泳对衍生小肽进行分离。在甲醇乙腈混合液为溶剂,乙酸-乙酸铵为缓冲体系,20℃,28kV,235nm二极管阵列检测(DAD)条件下,采用非水毛细管电泳模式,考察并优化小肽衍生物的分离条件,实现四种小肽衍生物的基线分离。     

毛细管电泳在生物大分子分离中的应用

本文回顾了近年来毛细管电泳在蛋白质和DNA分析中的应用及一些新的技术的进展情况,并介绍蛋白质-药物结合物的发现和分离,医学检验中对复杂样品的检测,在核酸分析中的荧光染色剂、筛分剂以及芯片毛细管电泳等方面的内容．     

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.     

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.……     

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.     

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.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.