نتایج جستجو برای: wood saving through substitution by other fuels
تعداد نتایج: 8185773 فیلتر نتایج به سال:
this ethnographic case study research was carried out in a private school setting in the context of iran. the research tried to explore the analysis and identity construction of a group of learners and teachers along with the content analysis of books on the basis of four types of commodified, political, national and narrative identities. how english language learners and teachers in an informa...
PURPOSE To examine the association between household use of biomass fuels for cooking and birth weight. METHODS Analysis is based on 3559 childbirths in the 5 years preceding the 1999 Zimbabwe Demographic and Health Survey. Birth weights, recorded by trained professionals at local health clinics, were derived from health cards at home or from mother's recall. Multiple regression method was us...
this study investigated how group formation method, namely student-selected vs. teacher-assigned, influences the results of the community model of teaching creative writing; i.e., group dynamics and group outcome (the quality of performance). the study adopted an experimental comparison group and microgenetic research design to observe the change process over a relatively short period of time. ...
NERGY MARKETS do not function efficiently in many developing countries, particularly in rural areas, where nearly 2 billion people do not have electricity or access to modern fuels such as oil and gas. The problem is likely to worsen in coming decades. The population of the developing world is expected to increase by 3 billion over the next forty years, and energy demand per capita will grow ra...
abstract this study evaluates the iranian pre-university english textbook in terms of needs, objectives, content, and methodology. the study was designed on the qualitative- quantitative survey basis using interviews and questionnaires, a researcher-made textbook evaluation checklist and a needs analysis questionnaire. the textbook evaluation questionnaire was used in this study to elicit the ...
The alternative energy sources are more and more used for production of heat. Several new combustion devices allow co-firing of different fuels, like dendromass and phytomass. The article analyses combustion of wood and straw pellets in the same boiler. Measurements were realized in two automatic heat sources – one is adapted to burn pellets made from wood or straw and another allows only burni...
specific surface area increment of alumina nanoparticles using mineral fuels in combustion synthesis
ammonium carbonate and ammonium sulfate have been proposed and used as two new fuels for synthesizing gamma alumina nanoparticles. the prepared samples have been characterized by x-ray diffraction (xrd), 2 n adsorption (bet) and transmission electron microscopy (tem). a comparison has been made between the properties of the nanoparticles synthesized by these two fuels and other conventional fu...
■ Carbon storage in forests. In one study, taking “no action” rather than harvesting stored more carbon. ■ Carbon storage considering forests, wood products, and concrete substitution. Collectively a 45-year harvest cycle, wood products and substitution for non-wood products stored more carbon than the “no action” managed forest scenario. ■ Carbon storage in houses. Wood-framed houses store mor...
BACKGROUND The focus of REDD+ is sensu stricto on maintaining forest carbon stocks. We extend the scope of sustainable management of forest from forests to timber utilization, and study carbon offsets resulting from the utilization of harvested timber for bio energy or harvested wood products (HWPs). The emission budget of harvesting operations depends on the loss of standing biomass by timber ...
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