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痕量物质     
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  trace substance
     Optical sensors are of considerable current interst in the trace substance analysis, and the sensitive material and analytical techniques are the key factors in improving the sensitivity and selectivity.
     应用光化学传感技术进行痕量物质的检测是目前研究的热点之一,而敏感试剂和测量的方法的探索是提高痕量物质分析选择性和灵敏度的关键因素。
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     The development of new analytical techniques for the determination of trace substance with high sensitivity and selectivity has always received much attention.
     发展对痕量物质具有高选择性、高灵敏的分析方法一直是分析工作者们追求的目标。
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     Immunoreaction processed on the surface of the sensor with good specific performance and high sensitivity. The immunosensor can analyze trace substance in a very short time, which is widely applied in the fields of clinical analysis, food analysis and environment analysis ect.
     免疫化学反应发生在传感器表面,特异性好,灵敏度高,能在较短时间内进行痕量物质检测,广泛应用于医疗卫生、食品分析、环境检测等领域。
短句来源
  trace materials
     With high sensitivity and specificity, the method of air pressure ionic mass spectrum (API MS) is suitable for measurements of trace materials in high purity gases.
     大气压离子质谱(API-MS)法以其高灵敏度及特效性,特别适合于分析高纯气体中的痕量物质
短句来源
  measuring trace material
     The photometric sensor based on rectangular prism with optical fiber is suitable to measuring trace material.
     基于直角棱镜的光纤光度传感器特别适合痕量物质的光度测量。
短句来源
  trace material
     The photometric sensor based on rectangular prism with optical fiber is suitable to measuring trace material.
     基于直角棱镜的光纤光度传感器特别适合痕量物质的光度测量。
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      trace substance
    Magnesium (and trace substance) deficiencies in the pathogenesis of cancer
          
    Body weight, metabolic rate, and trace substance turnover in animals
          
    The condition is that the trace substance is turned over in proportion to the standard metabolic rate; the derived equations can accordingly be used to test whether a given substance is feasible as a tracer of energy flow in ecologic systems.
          
    For a ground-level continuous release of a trace substance like 222Rn, for which the vertical profile of concentrations is exponential, a quantity, 'equivalent mixing height' h, is defined in this paper in the following way.
          
    Blood-retina barrier permeability is independent of trace substance lipid solubility in retinitis pigmentosa and in the healthy
          
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      trace materials
    Reactions are often very sensitive to trace materials and in particular it has been necessary to devise a technique for removing oxygen from carrier-gas streams down to very low levels.
          
    Various physico-chemical characteristics of mine waters as analysed include pH, alkalinity/acidity, specific conductivity, hardness, total solids, sulphate, chloride iron and trace materials.
          
    Within this flow regime the potential exists to contaminate surface drinking water supplies with a variety of trace materials.
          
    Effect of nonmetallic materials composition on spectral line intensity of trace materials of a function of main component positi
          
    By changing the input chemicals, we can also reduce any possible human exposures to toxic elements or trace materials.
          
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      trace material
    It is concluded that the use of carbon tabs for examination with SEM/EDS offers a practicable method for collecting trace material following stun gun deployment.
          
    After the initial alkaline rinse, each drum should be rinsed at least twice with fresh water to remove any trace material.
          


    This review article introduces the Inelastic Electron Tunneling Spectroscopy and its applications to identification of biochemical molecules, detection of trace matters, Light Emission of Inelastic Tunneling (LEIT), etc.

    本文介绍了非弹性电子隧道谱以及它在生物大分子的辨认,痕量物质检测和非弹性电子隧道发光(LElT)等方面的应用.

    Trace chemistry is intruduced in this paper as a newly developing branch of chemistry dealing with the properties and states of substances in trace amounts or trace con- centrations and the laws governing their physico-chemical behaviour.The main emphases here are placed on the peculiarities of trace substances exhibiting in their reaction rates,the dissociation of weak electrolytes,the precipitation of sparingly soluble substances etc.Be- sides,some specific concepts of trace chemistry are presented such as...

    Trace chemistry is intruduced in this paper as a newly developing branch of chemistry dealing with the properties and states of substances in trace amounts or trace con- centrations and the laws governing their physico-chemical behaviour.The main emphases here are placed on the peculiarities of trace substances exhibiting in their reaction rates,the dissociation of weak electrolytes,the precipitation of sparingly soluble substances etc.Be- sides,some specific concepts of trace chemistry are presented such as multicomponent-het- erogeneous systems and the minopresence of trace elements.

    痕量化学是研究痕量物质特殊规律的一门新的化学学科。为推动其发展本文着重论述在极稀浓度时,强电解质在活度和浓度关系上,弱电解质在离解度上表现的特殊性以及难溶物质的沉淀条件、沉淀形式和痕量物质的反应速率变化规律等。另外,从痕量化学观点引进痕量物质体系总为多相、多组分体系和痕量元素普遍存在的概念。

    Nonlinear Raman spectrum of various of liquids is detected by using pulsed photoacoustic method. The cause of limiting the detect sensitivity of PARS techenique, mainly due to linear absorption, is discussed. Furthermore, an improvement method, differential method, is used to elimnate the disturbance from linear absorption. The detect sensitivity of PARS techenique is increased, so that the Raman spectrum of low concentration matter and the weakline of Raman spectrum can be detected. The probability of using...

    Nonlinear Raman spectrum of various of liquids is detected by using pulsed photoacoustic method. The cause of limiting the detect sensitivity of PARS techenique, mainly due to linear absorption, is discussed. Furthermore, an improvement method, differential method, is used to elimnate the disturbance from linear absorption. The detect sensitivity of PARS techenique is increased, so that the Raman spectrum of low concentration matter and the weakline of Raman spectrum can be detected. The probability of using differential PARS techenique to detect contaminant is discussed.

    采用脉冲光声方法测量了各种有机和无机液体的受激喇曼光谱,探讨了影响这种光谱技术灵敏度的主要原因,即来自线性吸收信号的干扰,并进一步采用一种改进的方法——差分方法,消除了线性光声信号的影响,可以测量到比较弱的喇曼谱线以及浓度比较低的物质的喇曼光谱,并探讨了这种技术在痕量物质测量以及探测环境污染物质等领域中的应用前景.

     
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