Reference Substance Module

Modern software for the sample storage of all substances used in different analytical fields of QA of a corporation is of great interest for many customers and helps to solve logistics problems. A reference substance module stores information on substances for analytical testing (i.e., standard, reference, and impurities). This module includes support for ordering of the substances from the supplier and of the dispatch of analytical reports. 

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B) Phase-shift methods. The phase shift method for determining fluorescence lifetimes is based on the principle that if fluorescence is excited by suitably modulated light source, emitted radiation will also be similarly modulated. With reference to a scattering substance, emission from a fluorescent substance will introduce a time lag due to finite time between absorption and emission. This, by definition is the lifetime of the excited state. The time lag will cause a phase-shift relative to the exciting light. Phase fluorimetry requires a modulated light source and a phase sensitive detector. 

REGULATORY INFORMATION AT, CAL (Note with reference to section 8(d) of TSCA, EPA promulgated a model Health and Safety Data Reporting Rule. The section 8(d) module rule requires manufacturers, importers, and processors of listed chemical substances and... 

USSR National Standard Reference Data Service (NSRDS). The system was developed in 1976-1980 in the All-Union Research Center of NSRDS (now Russian Research Center on standardization, information and certification of raw materials, materials and substances) in Moscow. It provides specialists with attested databases, formed on the basis of standard and recommended reference data. The data of the lUPAC Commission on Thermodynamics, the International Association for the Properties of Steam, the U.S. National Bureau of Standards and other authenticated foreign data are used in the system as well. The informadon blocks of the system are sets of program modules, being the mathemadcal models of substances, and the blocks of numerical data for each substance. The basis for the model of a substance is a unified equadon of state for gas and liquid in the form of a double power expansion of the compressibility with respect to density and temperature. The principles of the molecular-kinetic theory and the dependence of the excess viscosity and thermal conductivity on density and temperature are used for the calculation of the transport properties. 

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