荧光分光光度计的功能扩展

在不改变荧光分光光度计的结构和影响仪器原有功能的条件下,对荧光仪的光路进行简单的设置,利用白纸导光,即可使原有的荧光分光光度计同时具有与紫外-可见分光光度计相同的功能.利用该简便方法,在荧光分光光度计上分别对滤光片和叶片进行透射光谱和反射光谱的测绘,并与紫外-可见分光光度计上的测绘结果进行比较,两者基本一致,证明该法是可行的.     

日立F-7000荧光分光光度计的使用

荧光分光光度法广泛应用于医药、农业、环境科学、生命科学、材料科学及食品科学等领域。简要介绍F-7000荧光分光光度计的基本构造和工作原理,同时以荧光增白剂33#为测试对象,对它的操作及维护进行详细介绍。     

一种双操作模式的荧光分光光度计

介绍一种可工作于MC和CRT双操作模式的荧光分光光度计，给出了其工作原理和MC模式下的软硬件实现方案。该仪器可方便的在两种操作模式之间切换。     

CaryZclipse荧光分光光度计

50多年来 ,Ｃａｒｙ品牌在分光光度计产品中一直代表着性能优异、质量上乘。最新推出的ＣａｒｙＥｃｌｉｐｓｅ荧光分光光度计继承了这一Ｃａｒｙ传统。Ｅｃｌｉｐｓｅ的闪烁式氙灯技术、插入即可自动识别的各种附件、出色的技术指标及直观、功能明确的操作软件充分体现了Ｃａｒｙ品牌的高品质。1　出色的仪器设计ＣａｒｙＥｃｌｉｐｓｅ荧光分光光度计的设计是基于最新的光学与电子学的技术发展 ,将光谱校正功能 ,发射与激发滤光片 ,以及扩展量程的光电倍增管检测器等都做为仪器标准配置 ,从而可保证同一台仪器满足多种应用。另外 ,Ｅｃｌ…     

天津市光学仪器厂

天津市光学仪器厂是国家定点生产制造物理光学仪器的重点企业。工厂以市场为导向，以服务用户为宗旨，多年来不断开发新品，创新技术，已成熟并在市场上占有一定份额的产品主要有：红外分光光度计、紫外分光光度计、荧光分光光度计、组合式光栅光谱仪和单色仪等系列产品，偏振光计算机演示实验系统，光学试验平台、光学调整架、激光发射光谱、看谱镜和药典标准仪器等系列产品。其中多个产品荣获国家、     

FIA—F4010流动注射荧光分光光度计及其应用研究

介绍了流动注射分析(Flow Injection Analysis,以下简称FIA)的基本原理、国内外FIA的发展概况和由F4010型荧光分光光度计(以下简称F4010)与FIA联机组装成的FIA-F4010流动注射荧光分光光度计(以下简称FIA-F4010)的基本组成和常用的工作流路。给出了FIA—F4010对本身具有天然荧光的L-色氨酸(L-Trp)、L-苯丙氨酸(L-Phe)和本身没有天然荧光的L-亮氨酸(L-Ieu)三种氨基酸分析的应用实例。同时对FIA-F4010的实用性,应用前景、功能/价格比等有关的问题进行了讨论。     

用AAS研究胡椒基荧光与铭（Ⅵ）的显色反应

应用原子吸收分光光度计对胡椒基荧光桐与铬（Ⅵ）的显色反应进行了研究,并对水样吕铬（Ⅵ）进行了测定,获得满意结果。     

国产绝对荧光量子产率测量系统的研制

为实现物质荧光量子产率的绝对法测量,研制了一套绝对荧光量子产率测量系统。系统主机采用国产荧光分光光度计,激发和发射波长范围均为200～900 nm。光路设计采用积分球技术,保证了样品的散射和发射光线被充分收集,具备进行绝对法荧光量子产率计算的基础。光谱校正采用罗丹明B量子计数器和标准钨灯相结合的方式,确保测量结果的准确性。研制的荧光量子产率分析软件具备自动光谱校正和自动计算量子产率功能。测试结果表明,系统的测量准确性较高,可满足大部分荧光物质的测试要求。     

高纯碳酸锂中痕量氯的荧光分光光度法测定

在硝酸介质中，痕量氯离子与银离子作用而沉淀，但在乳化剂OP存在下，能形成OP／水—氯化银乳浊体系，且较稳定。在荧光分光光度计上，该体系产生光散射光谱，可用于测定痕量氯离子。     

荧光分光光度计的结构与应用

荧光法因其具有灵敏度高,取样量少等特点,现已广泛应用于生化、化学、药物分析、食品检验、地理、冶金、医学、环境科学和生命科学研究等各个领域.荧光分析法的发展与仪器应用的发展是密不可分的.本文介绍了荧光分光光度计的结构、分类、应用.     

流动催化法制备碳纳米纤维工艺的研究进展

流动催化法是最有潜力实现碳纳米纤维工业化的生产方法。重点综述了在制备过程中温度、催化剂、载气及促进剂等因素对碳纳米纤维生长影响的研究进展,提出了综合优化各个反应参数的新思路以及该方法的未来发展方向。     

铜合金表面激光熔覆研究现状

为了提高铜合金的表面耐磨性能,激光熔覆技术已被用于铜合金的表面处理;总结了铜合金表面激光熔覆的特点,评述了铜合金表面熔覆材料体系的研究现状和激光熔覆技术工艺,分析了熔覆层的表面性能,阐明了铜合金表面激光熔覆存在的主要问题和相应改进途径,并提出了今后的研究方向。     

摩擦纳米发电机与等离子体技术的交叉融合

简要介绍了等离子体和摩擦纳米发电机(TENG)的相关概念、发展历程及分类,从绿色节能的角度出发阐述了两者相辅相成的发展现状。在此基础上,分别从等离子体对TENG摩擦材料的表面改性和TENG激励的等离子体两个方面展开综述。基于当前的研究进展和存在的关键问题,梳理了通过等离子体表面改性提升TENG输出性能的各类方法,并进一步阐述了等离子体刻蚀和离子注入辐照的应用现状,对TENG所能激励的不同等离子体电极结构进行了综述,并对其在输出性能的优化、场发射和质谱分析、物质合成与环境应用等领域的应用进展进行了分析。最后,对等离子体和TENG的融合做出总结,阐述了两者现阶段协同发展存在的问题和未来的发展方向,对今后融合发展的、以应用为导向的研究工作提供一定的参考。     

叶轮机械内部流动研究进展

以叶轮机械内部流动研究方法为线索,分别从理论分析、试验测试和数值计算三个方面对国内外叶轮机械内部流动的研究进展和现状进行综述.首先概述叶轮机械内部流动损失的分类、定义和研究现状.然后分别从分离流动理论、涡动力学和叶轮机械流型三个层次介绍叶轮机械内部流动理论的发展;从平面叶栅、环形叶栅、动态试验和试验技术等方面回顾叶轮机械试验研究进展;从控制方程、数值方法、网格生成等方面综述叶轮机械数值计算研究方法、研究内容及成果等,并概括改善叶轮机械气动性能的方法和现状.最后对叶轮机械内部流动研究进行展望.结果表明,叶轮机械内部流动研究取得了巨大进展,有些研究成果已经应用到了设计工作中,但仍需对叶轮机械内部流动进行更深入的研究.     

激光干涉仪的信号处理系统——激光干涉仪技术综述之三

介绍了激光干涉仪的信号处理方法,分析了单频激光干涉仪中消除直流漂移的方法,双频激光干涉仪中的减法器、频率解调、相位解调技术的特点。     

Electromagnetic interference modeling and suppression techniques in variable-frequency drive systems

Electromagnetic interference (EMI) causes electromechanical damage to the motors and degrades the reliability of variable-frequency drive (VFD) systems. Unlike fundamental frequency components in motor drive systems, high-frequency EMI noise, coupled with the parasitic parameters of the trough system, are difficult to analyze and reduce. In this article, EMI modeling techniques for different function units in a VFD system, including induction motors, motor bearings, and rectifier-inverters, are reviewed and evaluated in terms of applied frequency range, model parameterization, and model accuracy. The EMI models for the motors are categorized based on modeling techniques and model topologies. Motor bearing and shaft models are also reviewed, and techniques that are used to eliminate bearing current are evaluated. Modeling techniques for conventional rectifier-inverter systems are also summarized. EMI noise suppression techniques, including passive filter, Wheatstone bridge balance, active filter, and optimized modulation, are reviewed and compared based on the VFD system models.     

Strategies for the applications of flow control downstream of a bluff body

Flow over a bluff body is a common and significant case for engineering sciences. The well-known problem is the highly unsteady and vortical flow structure developing downstream of the body. The wake of the body has a complex flow dynamics. The chaotic flow structure in the wake causes serious structural deformation on the body; hence the flow is intended to be suppressed downstream of the body. There are numerous research papers for this purpose starting from 1960's. The literature survey points out that the investigations may be mainly classified as theoretical or experimental. Furthermore, the control of flow around bodies arranged as side-by-side or tandem was also studied in the past; however the flow control around a single bluff-body is reviewed in this paper. The investigations are currently continuing due to physical importance of the problem and there are increasing number of papers on flow control downstream of a bluff body which is mostly a circular cylinder. In this study, the recent development on the topic is considered such that the main results presented in papers for the last 15 years are reviewed and recalled in detail. The potential future investigation subjects are also discussed by referring to the major contributing solutions in previous related studies reviewed herein.     

Linear quadrupoles in mass spectrometry

The use of linear quadrupoles in mass spectrometry as mass filters and ion guides is reviewed. Following a tutorial review of the principles of mass filter operation, methods of mass analysis are reviewed. Discussed are extensions of quadrupole mass filters to higher masses, scanning with frequency sweeps of the quadrupole waveform, operation in higher stability regions, and operation with rectangular or other periodic waveforms. Two relatively new methods of mass analysis the use of “islands of stability” and “mass selective axial ejection” are then reviewed. The optimal electrode geometry for a quadrupole mass filter constructed with round rods is discussed. The use of collisional cooling in quadrupole ion guides is discussed along with ion guides that have axial fields. Finally, mass analysis with quadrupoles that have large distortions to the geometry and fields is discussed. An Appendix gives a brief tutorial review of definitions of electrical potentials and fields, as well as the units used in this article. © 2009 Wiley Periodicals, Inc., Mass Spec Rev 28:937–960, 2009     

农产品中农药残留的检测趋势

对农产品中农药残留检测的方法进行了综述，并讨论了其检测的趋势。     

Development of Methods of Ultrasonic Nondestructive Testing of Welded Joints

The methods of ultrasonic nondestructive testing of welded joints used in Russia are reviewed. The ways of testing the reliability of the testing results are discussed.