Xem 1-20 trên 45 kết quả Global surface
  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Solar activity, global surface air temperature anomaly and pacific decadal oscillation recorded in urban tree rings...

    pdf14p toshiba5 15-09-2011 17 2   Download

  • Global warming is the rising average temperature of Earth's atmosphere and oceans since the late 19th century and its projected continuation. Since the early 20th century, Earth's average surface temperature has increased by about 0.8 °C, with about two thirds of the increase occurring since 1980. Warming of the climate system is unequivocal, and scientists are more than 90% certain that most of it is caused by increasing concentrations of greenhouse gases produced by human activities such as deforestation and the burning of fossil fuels.

    pdf103p quynhp 21-11-2009 267 110   Download

  • Until about a century ago, the deep-ocean floor was completely inaccessible, hidden beneath waters averaging over 3,600 meters deep. Totally without light and subjected to intense pressures hundreds of times greater than at the Earth's surface, the deep-ocean bottom is a hostile environment to humans, in some ways as forbidding and remote as the void of outer space.

    pdf244p doan137 07-05-2010 117 27   Download

  • Knowledge of the Earth’s structure and dynamics calls for a multi-disciplinary study that makes use of the most advanced methods of Physics, Chemistry, Geology, Mathematics and Information Technology, in the framework, or in close collaboration with, the different branches of Earth Sciences such as Geology, Geophysics and Geodesy.

    pdf249p banhkem0908 24-11-2012 32 9   Download

  • After four centuries a quote from Galileo Galilei is still the most effective way to introduce a Metrology book: “Measure what is measurable, and make measurable what is not so”. Every human activity needs an objective measurement and every global process should be supported by a common standard. There are several handbooks, tutorials and journals that focus on the basic concepts of metrology, the uncertainty theory and the international reference standards. Moreover, the engineering literature is awash with measurement methods for each specific field.

    pdf470p wqwqwqwqwq 09-07-2012 40 8   Download

  • Nine years has passed since the 1992 second edition of the encyclopedia was published. This completely revised third edition, which is a university and professional level compendium of chemistry, molecular biology, mathematics, and engineering, is refreshed with numerous articles about current research in these fields. For example, the new edition has an increased emphasis on information processing and biotechnology, reflecting the rapid growth of these areas.

    pdf367p camchuong_1 04-12-2012 26 7   Download

  • Over the past few decades numerous studies have shown an alarming increase in the concentration of atmospheric particular matter called aerosols resulting from a variety of human activities, ranging from agricultural to combustion of fossil fuels. Besides having serious impacts on the health of all living creatures, these particles can affect planetary radiation budget. Consequences of this change include global temperature shifts and the altering of atmospheric and oceanic circulation patterns.

    pdf0p greengrass304 18-09-2012 23 6   Download

  • Sorption is a process by which chemicals or organisms become attached to soils and/or the geologic rock material (aquifer solids) and removed from the water. Often the sorption process is reversible and solutes desorb and hence dissolved-solute plumes are retarded, rather than solutes being permanently retained by the solids. Cation exchange is the interchange between cations in solution and cations on the surfaces of clay particles or organic colloids. Filtration is a process that affects particulate contaminants (e.g.

    pdf93p cao_can 29-12-2012 16 6   Download

  • This paper is the fourth in a series where we describe the space of all embedded minimal surfaces of fixed genus in a fixed (but arbitrary) closed 3manifold. The key is to understand the structure of an embedded minimal disk in a ball in R3 . This was undertaken in [CM3], [CM4] and the global version of it will be completed here; see the discussion around Figure 12 for the local case and [CM15] for some more details. Our main results are Theorem 0.1 (the lamination theorem) and Theorem 0.2 (the one-sided curvature estimate). ...

    pdf44p tuanloccuoi 04-01-2013 23 6   Download

  • In this paper we study some properties of reducible surfaces, in particular of unions of planes. When the surface is the central fibre of an embedded flat degeneration of surfaces in a projective space, we deduce some properties of the smooth surface which is the general fibre of the degeneration from some combinatorial properties of the central fibre. In particular, we show that there are strong constraints on the invariants of a smooth surface which degenerates to configurations of planes with global normal crossings or other mild singularities. ...

    pdf62p noel_noel 17-01-2013 17 5   Download

  • In this paper, we prove global second derivative estimates for solutions of the Dirichlet problem for the Monge-Amp`re equation when the inhomogee neous term is only assumed to be H¨lder continuous. As a consequence of our o approach, we also establish the existence and uniqueness of globally smooth solutions to the second boundary value problem for the affine maximal surface equation and affine mean curvature equation.

    pdf38p dontetvui 17-01-2013 22 5   Download

  • Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí sinh học đề tài :Global existence for the regularized surface Quasi-geostrophic equation and its inviscid limits

    pdf11p dauphong11 06-02-2012 11 4   Download

  • During the last decades, remarkable progress in heat flow studies has been made and a rough picture of the global surface heat flow density distribution can now be drawn. Simultaneously, the question of over which time period the surface heat flow is constant arose.

    pdf224p banhkem0908 24-11-2012 28 3   Download

  • This guide stresses the need for an effective security testing program within federal agencies. Testing serves several purposes. One, no matter how well a given system may have been developed, the nature of today’s complex systems with large volumes of code, complex internal interactions, interoperability with uncertain external components, unknown interdependencies coupled with vendor cost and schedule pressures, means that exploitable flaws will always be present or surface over time.

    pdf75p cao_can 02-01-2013 18 3   Download

  • The potential benefits are large and greatly exceed the expected costs of improved fuel economy. Cutting global average automotive fuel consumption (L/100 km) by 50% (i.e. doubling MPG) would reduce emis- sions of CO2 by over 1 gigatonne (Gt) a year by 2025 and over 2 gigatonnes (Gt) by 2050, and result in savings in annual oil import bills alone worth over USD 300 billion in 2025 and 600 billion in 2050 (based on an oil price of USD 100/bbl). The Initiative proposes several steps and actions to work towards the 50:50 overall goal and each step will achieve some of...

    pdf13p nhacnenzingme 23-03-2013 17 3   Download

  • Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: High potential for increase in CO2 flux from forest soil surface due to global warming in cooler areas of Japan...

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  • Council adopted the report of the Open-ended Intergovernmental Group of Ministers or Their Representatives on International Environmental Governance, which had been established pursuant to Governing Council decision 21/21. In that report it was suggested that “strengthening international environmental governance should be evolutionary in nature” and that “preference” be given to “making better use of existing structures”.

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  • Health is at the heart of human progress. It determines whether parents can work to support their families, children can attend school, women can survive childbirth, and infants can grow and thrive. Where health services are strong and accessible, families and communities flourish. Where health services are inaccessible, weak, or nonexistent, families suffer, adults die prematurely, and communities unravel. The Obama Administration has embraced global health as a core feature of its national security, diplomacy, and development work around the world.

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  • This paper attempts to examine the changes in surface water environment and community based coastal resources management activities in the Tam Giang Lagoon, Central Vietnam. The results show that the lagoon’s surface water has been polluted. BOD5, COD and nutrient concentration have increased in the lagoon’s surface water environment. It proved that there was a present of organic substances. Due to the globalization of seafood products and changes in lagoon’s water quality by aquaculture development; the local government has...

    pdf11p dem_thanh 22-12-2012 13 2   Download

  • If the soil becomes saturated, oxygen may become scarce and in anoxic conditions, denitrifying bacteria may convert the nitrate to nitrogen gases (NO, N2O, and N2). Nitrogen converted to these gases becomes unavailable for plant uptake or for surface water contamination. Additionally, saturated soil during the growing season is harmful to many crops like maize that cannot tolerate low oxygen concentrations in the root zone for more than a few days.

    pdf0p tainhacmienphi 19-02-2013 11 2   Download

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