快速流动式自动化学分析仪简介

本文介绍了流动式自动化学分析仪的现状、仪器的分类、原理、系统流程、化学歧管、检测系统,并将CFA和FIA及CEA与HPLC作了比较。介较了自动化学分析仪在许多领域中的应用。     

国内铝光度分析的进展(续)

<正> 4 流动注射分析流动注射分析(FIA)具有独道的提高工作效率、使分析工作实现自动化的优越性,这使近年来有关FIA用于测定铝的工作研究逐步增多。基于β—环糊精—丙酮能加速增敏铝—钙黄绿素的荧光反应性质研究了以Al(Ⅲ)—Calcein—β—CD—丙酮新体系流动注射荧光法测定中草药中微量铝的新方法。荧光最大激发波长和发射波长分别位于478.0nm和     

网络化制造系统联邦集成的关键技术

联邦集成架构(FIA)是异构网络化制造系统集成的新方法.本文按照FIA接口规范,实现了FIA中的联邦执行支撑环境(FEI).对系统的关键技术--分布自治结构的联邦管理技术、支持跨系统任务协作的访问控制与授信技术、跨系统的分布式共享资源调度技术、服务搜索与匹配技术等进行了研究,并给出了相应的解决方案.该联邦集成系统已在北京网络化制造系统集成中得到了实际应用.应用结果表明,联邦模式的集成方案是一种适用于构建大规模服务共享的集成模式,能够适应网络化制造服务异构及运营目标多样化的应用环境.     

流动注射分析仪检测水中氰化物的方法研究

为获得一种准确、快速、灵敏自动检测水中氰化物的方法,本文使用流动注射分析仪(FIA)分析水中的氰化物的含量,并与传统分光光度法的分析结果进行比对。实验证明本方法操作简便、线性好,灵敏度、精密度、准确度都能符合分析工作要求。     

流动注射法测定水体中总磷

采用QuikChem8000FIA流动注射法对水体中总磷进行测定,相关系数达到0.9997,检出限为1.847μg/L。对高低两个不同浓度标准样品分析,测得值均在其保证值范围内,回收率为105.9%和99.8%,相对标准偏差小于10%,适用于大批量样品测定。     

一种用于FIA系统的微型泵

介绍了一种FIA（Flow Injection Analysis－流动注入分析）系统中的部件－微型振膜泵。该微型泵体采用无阀式的扩散管／喷嘴结构,由电磁－机械方式驱动振膜的振动,用干电池作电源。实验数据表明,该泵可在0－1．5ml/min（液体）流量范围内工作稳定,并具有结构简单、流量易于控制以及利于批量生产成本低廉等优点,有很好的应用前景。     

基于图像亚像素分析的车Z对称性检测系统设计

针对人工检测圆弧车刀对称性中存在的效率低下、误判率高等问题,设计了基于图像亚像素分析的车刀对称性检测系统。系统硬件包括CCD摄像头、光源、图像采集卡和PC等模块,在软件上设计了基于亚像素分析的边缘检测程序,实现刀口边缘对称性的检测,并具有数据保存、图形化显示等功能。系统较好的满足了在线检测和自动化检测的要求,提高了生产效率。     

碳基导电材料在传感检测分析中的应用研究进展

碳基导电材料是指以碳原子为骨架的材料体系,具有结构多样、可调控性强和化学稳定性高等优异性能。将碳基导电材料引入传感检测分析可以改善传感器的信号强度,提高传感检测分析的稳定性。与传统材料制成的传感器相比,使用碳基导电材料制备的传感器检测分析物质具有更高的灵敏度、更低的检测限及更宽的线性范围。因此,基于碳基导电材料的检测分析技术已显现出巨大的潜力,在医学诊疗、环境监测和食品检测等领域均具有广阔的应用前景。本文介绍了以维度划分的碳基导电材料的类别及其所制备的传感器在传感检测分析中的应用,提出了碳基导电材料及其所制备的传感器在检测分析物质中存在的问题及挑战,并对未来研究的趋势进行了展望。     

电缆振荡波局放检测在供水企业中的应用

该文列举了10 kV交联聚乙烯电缆预防性检测的方法,并对各项检测方法进行了总结和分析,引出使用振荡波局放检测的必要性,详细介绍了电力电缆振荡波局放检测的工作原理、检测的方法和诊断的标准。该文根据10 kV交联聚乙烯电缆振荡波局放检测在供水企业的应用案例与实际效果,分析了使用振荡波局放检测技术对水厂供电线路电缆检测的必要性。     

超声波技术在食品生产检测和食品安全检测中的应用进展

超声波这项新技术被用于研究和诊断领域已经有很多年了。本文分别例举了超声波技术在乳品品质检测,肉制品品质检测,面粉品质检测,果蔬产品品质检测,添加剂分析,农药残留分析和金属元素分析上的应用。旨在对其目前在食品生产领域和食品安全检测领域中的应用及其进展进行介绍,为新检测技术研究者提供参考资料。     

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.     

From Industry 4.0 to Research 4.0. Development of High Performance Fibers in the Light of Digitization

We associate a variety of innovations with the term ＂Industry 4.0＂. The pioneer of many 4.0 modifications forms the basisfor the trend towards the integrated di...     

Roman iron and steel: A review

ABSTRACT

The production of ferrous metal increased during the Roman Late Republican period, Principate and Empire. The direct bloomery process was used to extract the metal from its ores using slag-tapping and slag-pit furnaces. The fuel was charcoal and an air blast was introduced by bellows-operated tuyères. Iron formed as a bloom, often as a spongy mass of metal, which contained impurities from the smelting process, including unreacted ore, fuel, slag and fragments from the furnace walls, while the metal was often inhomogeneous with varied carbon contents. Blooms were either smithed directly into bars or ingots or they were broken up, which also allowed the removal of gross impurities and a selection of pieces with similar properties to be made. These could then be forge-welded together and formed into characteristically shaped ingots. Making steel in the furnace seems to have been achieved: it depended on the ore and the furnace and conditions within it. Surface carburization was also carried out. Iron and steel were used extensively in construction and for tools and weapons. Fire welding was often used to add pieces of steel to make the edges of tools and weapons, which could be heat-treated by quenching to harden them.     

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.     

Synthesis of Alumina-Zirconia Nanocomposites by Solgel Process

Al₂O₃-ZrO₂ nanocomposites were developed starting with the solgel process. Composite alumina-zirconia nanopowders were synthesized from metallorganic precursors (Aluminium secondary butoxide and zirconium Iso propoxide) using the solgel process. The parameters affecting the synthesis—solvent, concentration of precursor, R/H ratio (i.e., dilution of water in solvent)—were varied as also the temperature and pH. BET and TEM were used to measure nanosize. Diffuse reflectance spectroscopy and also qualitative optical absorption led to identical particle size estimate. The variation of process parameters was used to study the effect and interdependence of process parameters. Artificial Neural Networks was used to rigorously analyze the process. Although this led to confirmation of interdependence of parameters, the presence of a single overwhelming solvent variable was also established. Then the optimal process was used to synthesize more nanopowder. To produce bulk nanocomposite the nanopowders were sintered by varying the temperature and time period. The sintered lithoids were probed with a vickers hardness tester to measure elastic modulus, hardness, and fracture toughness. The results showed high elastic modulus, modest hardness, and very high fracture toughness.     

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.……     

Friction Stir Processing Strategies for Uniform Distribution of Reinforcement in a Surface Composite

Friction stir processing (FSP) is an important technique for preparing surface composites. Fabricating defect-free surface composites with uniform particle distribution by FSP is a challenging task. In this study, silicon carbide particles reinforced AA5083 alloy surface composites was fabricated using different FSP strategies including variation in process parameters, dual-tool processing and tool offset overlapping. Material flow of the processed material with reinforcement particles demonstrated that the distribution of particles was influenced by the stirring action of the probe as well as the extrusion of the plasticized material due to the movement of the tool. Process parameters, particularly rotational speed, showed a dominant influence on the distribution of silicon carbide particles.