Xem 1-20 trên 28 kết quả Climatic cycles
  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí sinh học Journal of Biology đề tài: Islands in the sky: the impact of Pleistocene climate cycles on biodiversity...

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  • Our planet’s atmosphere is thought to have changed gradually and over a very wide range of CO2 concentrations throughout history. From ancient atmospheric gases trapped in ice bubbles, we have strong evidence indicating that atmospheric CO2 values reached minimum concentrations of approximately 180 parts per million during the Last Glacial Maximum, which was only 15,000 years ago. At the other extreme, calculations suggest that some 500 million years ago the atmospheric CO2 concentrations may have been about 4000 to 5000 parts per million....

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  • Impoverishing the local resource base can impoverish wider areas: deforestation by highland farmers causes flooding on lowland farms; factory pollution robs local fishermen of their catch. Such grim local cycles now operate nationally and regionally. Dryland degradation sends environmental refugees in their millions across national borders. Deforestation in Latin America and Asia is causing more floods, and more destructive floods, in downhill, downstream nations. Acid precipitation and nuclear fallout have spread across the borders of Europe.

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  • The purpose of this paper is to evaluate if financial asset prices and, in par- ticular, sectoral stock prices can help to predict real economic growth. Earlier studies that have examined the predictive content of stock prices have employed broad-based indices. However, there are reasons to believe that some sectors making up the stock indices are more closely linked to the business cycle than others.

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  • The oceans cover over 70% of our planet's surface. Their physical, chemical and biological properties form the basis of the essential controls that facilitate life on Earth. Current concerns such as global climate change, pollution of the world's oceans, declining fish stocks, and the recovery of inorganic and organic chemicals and pharmaceuticals from the oceans call for greater knowledge of this complex medium. This volume brings together a number of experts in marine science and technology to provide a wide-ranging examination of some issues of major environmental impact....

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  • A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. Butterflies comprise the true butterflies (superfamily Papilionoidea), the skippers (superfamily Hesperioidea) and the moth-butterflies (superfamily Hedyloidea). All the many other families within the Lepidoptera are referred to as moths.

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  • A butterfly is a mainly day-flying insect of the order Lepidoptera, which includes the butterflies and moths. Like other holometabolous insects, the butterfly's life cycle consists of four parts: egg, larva, pupa and adult. Most species are diurnal. Butterflies have large, often brightly coloured wings, and conspicuous, fluttering flight. Butterflies comprise the true butterflies (superfamily Papilionoidea), the skippers (superfamily Hesperioidea) and the moth-butterflies (superfamily Hedyloidea). All the many other families within the Lepidoptera are referred to as moths.

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  • These limitations arise because the P2P world is lacking in the areas of semantics, data transformation, and data relationships, yet these are some of the core strengths of the data management community. Queries, views, and integrity constraints can be used to express relationships between existing objects and to define new objects in terms of old ones. Complex queries can be posed across multiple sources, and the results of one query can be materialized and used to answer other queries.

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  • Soil communities are important aspects of biodiversity and they are involved in many important ecosystem processes, particularly nutrient cycling. Soil chemistry is neither an aspect of biodiversity nor one of the primary causes of change addressed by this project. Nevertheless, understanding mechanisms of change and correctly attributing effects to causes are central to the project, making it necessary to understand the soil chemistry at sites.

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  • Two features stand out. First, leverage is procyclical. Leverage increases when balance sheets expand. Conversely, leverage falls when balance sheets contract. Thus, leverage tracks the waxing and waning of balance sheets in a way that amplifi es the fi nancial cycle. Although “procyclical leverage” is not a term that the banks themselves would use in describing how they behave, this is in fact what they are doing. Second, there is a striking contrast between the distress in 1998Q4 associated with the LTCM crisis and the credit crisis of the summer of 2007.

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  • In response to climate change, many countries are likely to invest in even more infrastructure for coastal defenses and flood control to reduce the vulnerability of human settlements to climate change. Increased water shortages will increase demand for new irrigation facilities and new reservoirs. Similarly, natural ecosystems can reduce vulnerability to natural hazards and extreme climatic events and complement, or substitute for, more expensive infrastructure investments to protect coastal and riverine settlements.

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  • This book explores a relatively small, but interesting and anomalous, region of Alberta between the North Saskatchewan and the Battle Rivers. The Beaver Hills arose where mountain glaciers from the west met continental ice-sheets from the east. An overview of the hills’ physiography helps us to grasp the complexity and diversity of landscapes, soil types, and vegetation communities. Ecological themes, such as climatic cycles, ground water availability, vegetation succession and the response of wildlife, and the impact of fires, shape the possibilities and provide challenges to those who...

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  • Many recent papers have documented variations in aerosol loading, surface cooling and their possible relationships with rainfall in the monsoon regions of India and East Asia (Krishnan and Ramanathan, 2002; Devara et al., 2003; Cheng et al., 2005, Prasad et al., 2006; Nakajima et al., 2007; George et al., 2008; and many others).

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  • In addition to global climate change, these include: the health risks posed by stratospheric ozone depletion; loss of biodiversity; stresses on terrestrial and ocean food-producing systems; changes in hydrological systems and the sup- plies of freshwater; and the global dissemination of persistent organic pollutants. Climate change and stratospheric ozone depletion are the best known of these various global environmental changes.

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  • From 1992 to 2000, the pace of merger activity rose to unprecedented levels. An environment of sustained economic growth and rising stock prices facilitated transactions. Toward the end of 2000, the economic climate shifted and merger activity in the fourth quarter declined. The economy showed only small growth during the first quarter of 2001. Excess capacity in a number of industries had developed, and sales and profit disappointments began to widen. The business cycle had returned. Valuations in Internet companies and other high-tech industries have been sharply revised downward.

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  • The world faces serious difficulties in obtaining the energy that will be needed in coming decades for a growing population, especially given the problem of climate change caused by fossil fuel use. This book presents a view of nuclear energy as an important carbon-free energy option. It discusses the nuclear fuel cycle, the types of reactors used today and proposed for the future, nuclear waste disposal, reactor accidents and reactor safety, nuclear weapon proliferation, and the cost of electric power.

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  • These research teams study for example the impact and mechanisms of greenhouse gas emissions and atmospheric pollutant on climate, ozone depletion and carbon sinks (oceans and inland waters, forests and soil). They do research to understand the mechanisms and assess the impact of global change on the water cycle, water quality and availability, as well as soil functions and quality to provide the bases for management tools for sustainable water systems. Biodiversity and ecosystems are analysed to understand and minimise the negative impacts of human activities.

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  • According to the Intergovernmental Panel on Climate Change, the impacts of climate chang on the water cycle are already evident and projected to increase substantially in the futur Climate change impacts the quantity and qua of freshwater resources and the frequency of extreme events, such as floods and droughts While climate change is only one of many drivers increasing pressure on water resource its impact is projected to be significant and to accelerate over time. Climate change reinforc and adds urgency to the case for good water resources management more generally.

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  • The rain forest takes an immense breath and then exhales, once every four or five years, as a major global weather pattern plays out, usually heralded by El Nin˜o–Southern Oscillation. While this powerful natural cycle has occurred for many millennia, it is during the past decade that both the climate of Earth and the people living on it have had an increasing influence on the weather pattern itself, with many biological consequences. In Southeast Asia, as also in most of the Neotropics, El Nin˜o accompanies one of the most exuberant outpourings of nature’s diversity.

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  • Automotive engine The component of the motor vehicle that converts the chemical energy in fuel into mechanical energy for power. The automotive engine also drives the generator and various accessories, such as the air-conditioning compressor and power-steering pump. See also: Automotive climate control; Automotive electrical system; Automotive steering Early motor vehicles were powered by a variety of engines, including steam and gasoline, as well as by electric motors.

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