نتایج جستجو برای: chlorofluorocarbons
تعداد نتایج: 647 فیلتر نتایج به سال:
On October 14, 2008, practices and policies in every dialysis unit in the United States and its territories will be significantly changed with the implementation of the 2008 Conditions for Coverage (CfCs) for End-Stage Renal Disease Facilities (Office of the Federal Register, 2008). These CfCs mark the first wholesale change in the regulations for dialysis units in more than 30 years, and the C...
Background The scenario of a changing environment, widely termed as global change is mainly caused by human activities. Oil and carbon combustion, the use of chlorofluorocarbons, and deforestation are one of the main factors responsible for increasing CO2 concentration and for an increase of air temperature. In addition global changes will affect precipitation patterns, nitrogen concentration i...
Ten years of earth observation by the MIPAS instrument aboard the European environmental satellite Envisat [1] led to a considerable amount of measurement and processed data, which has to be managed and visualized by powerful and flexible software tools. This paper gives an overview about new concepts, tools and methods for the 3D visualisation of continuous, multidimensional, meteorological Sa...
Based on observations of the chlorofluorocarbons CFC-13 (chlorotrifluoromethane), 6CFC-114 (combined measurement of both isomers of dichlorotetrafluoroethane), and CFC-115 (chloropentafluoroethane) in atmospheric and firn samples, we reconstruct records of their tropospheric histories spanning nearly 8 decades. These compounds were measured in polar firn air samples, in ambient air archived in ...
Ample physical evidence shows that carbon dioxide (CO(2)) is the single most important climate-relevant greenhouse gas in Earth's atmosphere. This is because CO(2), like ozone, N(2)O, CH(4), and chlorofluorocarbons, does not condense and precipitate from the atmosphere at current climate temperatures, whereas water vapor can and does. Noncondensing greenhouse gases, which account for 25% of the...
Details of a heat pump assisted solar water heating system, is briefly described. Refrigerants compromising of Fluorocarbons and Chlorofluorocarbons have been generally used as the working fluid. But due to its ozone depletion effect and high Global warming potential, they have been replaced by synthetic refrigerants such as R22, R134 etc. The heat pump utilizing such refrigerants has shown to ...
After the elimination of Chlorofluorocarbons as auxiliary blowing agents, the reduction of the amount of Volatile Organic Compound (VOC’s) emissions from car interior components is one of most recent requirements of the Automotive Industry. Polyurethane foams, and more specifically the tertiary amines used for their production, have been under scrutiny. One of the recent research programs of Th...
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