نتایج جستجو برای: during different historic periods

تعداد نتایج: 3229969  

Journal: :Journal of Cave and Karst Studies 2012

2011
Douglas C Morton Marcio H Sales Carlos M Souza Bronson Griscom

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...

Journal: :Terrestrial, Atmospheric and Oceanic Sciences 1994

Journal: :Journal of International Financial Markets, Institutions and Money 2022

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...

Journal: :تولیدات دامی 0
مهدی میرزایی استادیار گروه علوم دامی، دانشکده کشاورزی و منابع طبیعی، دانشگاه اراک علی صادقی سفیدمزگی استادیار گروه علوم دامی، دانشکده کشاورزی، دانشگاه صنعتی اصفهان محمد خوروش دانشیار گروه علوم دامی دانشگاه صنعتی اصفهان غلامرضا قربانی استاد گروه علوم دامی دانشگاه صنعتی اصفهان پیروز شاکری استادیار پژوهشی بخش تحقیقات علوم دامی، مرکز تحقیقات و آموزش کشاورزی استان کرمان

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...

سیدمحمدعلی جلالی حاجی آبادی, , سیدعبدالحسین ابوالقاسمی, , علیرضا جعفری, , محمد روستائی علیمهر, , محمود حقیقیان رودسری, ,

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...

Journal: :Cancer epidemiology, biomarkers & prevention : a publication of the American Association for Cancer Research, cosponsored by the American Society of Preventive Oncology 2011
Anna L V Johansson Therese M-L Andersson Chung-Cheng Hsieh Sven Cnattingius Mats Lambe

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...

Journal: :Environmental Health Perspectives 2003
Justin E Aldridge Frederic J Seidler Armando Meyer Indira Thillai Theodore A Slotkin

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-...

2002
Amy Snover Dennis P. Lettenmaier

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...

نمودار تعداد نتایج جستجو در هر سال

با کلیک روی نمودار نتایج را به سال انتشار فیلتر کنید