نتایج جستجو برای: perfluorocarbons
تعداد نتایج: 192 فیلتر نتایج به سال:
HE KYOTO PROTOCOL, THE SUBJECT OF intense political and scientific debate throughout the world since its introduction in 1997, is now poised to enter into force. The Protocol establishes a “double trigger,” requiring both ratification by 55 governments (which was met in 2002) and that the ratifying governments represent at least 55% of the developed nations’ 1990 carbon dioxide emissions. Altho...
The crystalloid – colloid debate regarding the most effective intravenous fluid for resuscitation from haemorrhagic shock has been raging over the past 60 years, and still continues without a satisfactory resolution (1). Crystalloid solutions are essentially isotonic salt solutions (270-310 mOsm/L) and have been in use since the 1800s but their use became widespread during World War I. Normal s...
Atmospheric measurements show that emissions of hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons are now the primary drivers of the positive growth in synthetic greenhouse gas (SGHG) radiative forcing. We infer recent SGHG emissions and examine the impact of future emissions scenarios, with a particular focus on proposals to reduce HFC use under the Montreal Protocol. If these proposals a...
The international legal foundation of the Clean Development Mechanism and the key requirements for successfully embarking on such projects are introduced. Potential opportunities for South African mining companies are highlighted. An explanation of national legal authorisation requirements will follow with reference to a hypothetical coal bed methane capture project as a case study. Issues such...
The crystalloid – colloid debate regarding the most effective intravenous fluid for resuscitation from haemorrhagic shock has been raging over the past 60 years, and still continues without a satisfactory resolution (1). Crystalloid solutions are essentially isotonic salt solutions (270-310 mOsm/L) and have been in use since the 1800s but their use became widespread during World War I. Normal s...
The primary aluminium production process has been identified as the largest anthropogenic source of emissions of two perfluorocarbons (PFCs): tetrafluoromethane (CF4) and hexafluoroethane (C2F6). Primary aluminium is produced using the Hall-Héroult electrolytic process, where the smelting pot itself acts as the electrolysis cell during the reduction process. When the alumina ore content of the ...
The Framework Convention on Climate Change (1992) and the Kyoto Protocol (1997) set the foundations for the global control of greenhouse gas emissions, and hence the control of global warming. While developing countries do not yet have emission reduction targets under the Protocol, they stand to gain by its provisions. First,global warming damage is unequally distributed and is likely to affect...
heterogeneous polymerization of vinylidene fluoride (VDF) has been investigated in scCO2 in the presence of different perfuoropolyether surfactants using DECP as free radical initiator. When carboxylate perfluoropolyether was used higher monomer conversions were obtained with respect to precipitation processes. PVDF was collected at the end of the process under the form of a white powder and SE...
نمودار تعداد نتایج جستجو در هر سال
با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید