نتایج جستجو برای and Impacts

تعداد نتایج: 7683758  

This edited volume is devoted to the examination of the implications of the inevitable changes wrought by global change on the welfare and livelihoods of tens of millions of people who live in dryland regions. Global change is more than just climate change and the ramifications of changing trade patterns (geopolitical and economic aspects), the shift to the market economy, demographic factors (...

2004

Climate variability and trends impact on Australia’s economy, environment and society. Australian research organisations are conducting many research projects to understand the magnitude of climate change (including natural variability and human induced climate change) and the physical drivers that underpin our ability to forecast and manage its impacts. Australia’s average temperature varies b...

2006
Van C. Bowersox, Christopher M.B. Lehmann,

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه فردوسی مشهد - دانشکده ادبیات و علوم انسانی دکتر علی شریعتی 1387

this study was designed to investigate the impacts of teachers self-disclosure on students foreign language classroom anxiety, attitude to english language learning and their achievement scores at the end of the term. there were 48 female learners of intermediate level. they were not randomly selected. there were one experimental group with 21 students and one control group with 27 students.the...

2002
Donald J. Wuebbles, Katharine Hayhoe,

The concentration of methane (CH4), the most abundant organic trace gas in the atmosphere, has increased dramatically over the last few centuries, more than doubling its concentration. The increasing concentrations of methane are of special concern because of its effects on climate and atmospheric chemistry. On a per molecule basis, additional methane is much more effective as a greenhouse gas ...

2007
PETER H. SCHULTZ,

Impact by clusters of projectiles rather than a single projectile can result from several processes' atmospheric breakup, tidal breakup, and ejecta from a large primary impact. Experiments have been performed in order to establish the characteristics of such events over a wide range of impact velocities (15 m/s to 6 km/s). At very low impact velocities (15-200 m/s), clustered impacts were produ...

2000
Peter Edwards,

Aquaculture is often viewed narrowly as intensive culture of salmon and shrimp to provide high value products for luxury markets and is often associated with environmental degradation. The promotion of aquaculture for rural development has had a poor record in many developing countries, especially in Africa. This paper shows that aquaculture does contribute to the livelihoods of the poor, parti...

Journal: :Science 1984
M R Rampino, R B Stothers,

Time-series analysis reveals two dominant, stable long-term periodicities approximately equal to 33 +/- 3 and 260 +/- 25 million years in the known series of geological and biological upheavals during the Phanerozoic Eon. Because the cycles of these episodes agree in period and phase with the cycles of impact cratering on Earth, these results suggest that periodic comet impacts strongly influen...

Journal: :Science 1997
H Tiedemann,

(ii) hepatocyte growth factor/nerve growth factor/transforming growth factor–␤(TGF␤)/glial cell line–derived neurotrophic factor: 36 Ϯ 13 min –1 (n ϭ 12), (iii) TGF ␣/glial growth factor: 8 Ϯ 5 min –1 (n ϭ 8), and (iv) neurotrophin-3/plate-derived growth factor– AA: 16 Ϯ 6 min –1 (n ϭ 12). Each of these factors promoted cell survival, proliferation, or differentiation in other assays performed ...

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