نتایج جستجو برای: during different historic periods
تعداد نتایج: 3229969 فیلتر نتایج به سال:
BACKGROUND Historic carbon emissions are an important foundation for proposed efforts to Reduce Emissions from Deforestation and forest Degradation and enhance forest carbon stocks through conservation and sustainable forest management (REDD+). The level of uncertainty in historic carbon emissions estimates is also critical for REDD+, since high uncertainties could limit climate benefits from c...
Pukthuanthong and Roll (2009) measure the degree of market integration by percentage a market’s returns explained global risk factors. However, during periods crisis characterised high volatility, their may be biased. This paper investigates determinants explanatory power in multi-factor model crises. We show that is influenced factor heteroscedasticity, changes loadings residual heteroscedasti...
this study was carried out to assess the effects of alfalfa hay level and replacing corn grain by other grains in starter on daily feed intake, average daily gain (adg) and feed efficiency (fe) of pre and post-weaning dairy calves during the pre and post-weaning periods. for this purpose, a database meta-analysis used in the present study. statistical analyses were performed using proc mixed in...
Two hundred Arian broiler chicks were used to investigate the effect of contents of dietary glucosinolates on performance of broiler chicks during starter (0-21 days of age) and grower periods (22-42 days of age) in a completely randomized design. The dietary glucosinolates contents in the starter period were 0 (S1), 7.5 (S2), 15 (S3), 22.5 (S4), 30 (S5) µmol/g and in the grower period they wer...
BACKGROUND Because of a continued trend toward postponed childbearing, the incidence of pregnancy-associated breast cancer (PABC) is likely to increase. This study investigated the mortality in women with PABC in relation to when the tumor was detected (during pregnancy, different postpartum periods) and by time since diagnosis, compared with women with non-PABC. METHODS A population-based co...
During brain development, serotonin (5HT) provides essential neurotrophic signals. In the present study, we evaluated whether the developmental neurotoxicity of chlorpyrifos (CPF) involves effects on 5HT signaling, as a potential mechanism underlying noncholinergic neuroteratogenic events. We evaluated four different treatment windows ranging from the neural tube stage [gestational days (GD) 9-...
Designing Appropriate Linkages Between Hydrologic Research and Water Planning Studies Potentially significant changes in regional climate over the time horizon for water resources planning may create new challenges for risk assessment and the development of appropriate adaptation strategies. An important first step in assessing vulnerabilities to an altered climate (and ultimately creating viab...
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