Xem 1-20 trên 46 kết quả Nitrogen cycle
  • Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Effects of a clear-cut on the in situ nitrogen mineralisation and the nitrogen cycle in a 67-year-old Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco) plantation...

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  • Sử dụng khí sinh học làm chất đốt nhằm giảm tiêu thụ gỗ củi phục vụ các mục đích khác nhau và cũng góp phần giảm các bệnh về mắt và phổi do khói bụi gây ra khi đun nấu. Khí methane (50-70%). Khí carbonic (CO2) (30-45%). Và một lượng nhỏ các khí khác như nitrogen (N2) (0-10%), Hydrogen (H2) (0-10%), hydrogen sulphide (H2S) (0-3%) và oxygen (O2) (0-2%). Sự cháy của KSH do hàm lượng khí mêtan trong KSH quyết định.

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  • A plant nutrient is a chemical element that is essential for plant growth and reproduction. Essential element is a term often used to identify a plant nutrient. The term nutrient implies essentiality, so it is redundant to call these elements essential nutrients. Commonly, for an element to be a nutrient, it must fit certain criteria. The principal criterion is that the element must be required for a plant to complete its life cycle. The second criterion is that no other element substitutes fully for the element being considered as a nutrient.

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  • The synthesis includes empirical data from on-going studies of the dehesa and grazing behavior and performance of Iberian pigs finished on acorns. The authors conclude that farmers conserve, prune and reforest oaks to maintain fruit production to feed and fatten Iberian pigs during the montanera or pannage, which result in conservation of biodiversity and associated ecosystem services.

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  • As discussed in Section I, no prior study examines the relation between corporate governance mechanisms and the likelihood of an earnings restatement. A few studies examine the consequences of earnings restatements. William Kinney and Linda McDaniel analyze the stock price reaction for a sample of 73 firms that restated earnings between 1976 and 1985.18 They find that, on average, stock returns are negative between issuance of erroneous quarterly statements and its corrections.

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  • Next, a few words about our strategy. It is well recognized now that one has to go beyond the Einstein-Hilbert action for gravity, both from the experimental viewpoint (eg.,because of Dark Energy) and from the theoretical viewpoint (eg., because of the UV incompleteness of quantized Einstein gravity, and the need of its unification with the Standard Model of Elementary Particles). In our approach, the origin of inflation is purely geometrical, ie. is closely related to space-time and gravity.

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  • The Board of Directors will recall that the Government, with the support of the International Community, had requested the African Development Bank to play a lead role in assisting and supporting Zimbabwe’s economic recovery. The Bank has supported Zimbabwe over the past two years in line with the recommendations made in the Country Brief that was approved by the Board of Directors in 2010 (ADB/BD/WP/2010/Approval).

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  • References Aber, J.D. (1992) Nitrogen cycling and nitrogen saturation in temperate forest ecosystems. Trends in Ecology and Evolution. Aber, J.D. & Federer, C.A. (1992) A generalised, lumped-parameter model of photosynthesis, evapotranspiration and net primary production in temperate and boreal forest ecosystems.

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  • The IDB’s measures of the impact of the funds and the outstanding is- sues and conclusions from the IDB study are summarized here. Despite the large amount of resources that the IDB and the World Bank have been lending to the funds, their scope is small. Only one fund in the region, Nicaragua, spends as much as 1 percent of the gross domes- tic product (GDP) in its fund; only three countries—Chile, Panama, and Uruguay—spend more than US$15 per year per poor person. And the poor countries on average spend less than US$10 a year.

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  • Improvement in the economic and financial outlook since the spring of 2009 reflects a broad and aggressive policy response that has included the initiatives and programs under HERA and TARP as discussed above, other financial stability policies implemented by the FDIC and the Board of Governors of the Federal Reserve, accommodative monetary policy, and the American Recovery and Reinvestment Act of 2009 (ARRA or the Recovery Act).

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  • The presence of nontraded goods in our model increases the relative volatility of nominal and real exchange rates relative to the volatility in the model without nontraded goods. An important aspect of the behavior of exchange rates in our model with nontraded goods hinges on the agent's inability to optimally share the risk associated with country-speci¯c shocks to productivity in the nontraded goods sector. In response to a (persistent) positive shock to productivity in this sector, agents wish to consume and invest more.

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  • The Central Bank today publishes statistics for Q1 2012 on investment funds (IFs) resident in Ireland. Irish resident IFs expanded strongly in Q1 2012, driven by performing global equity markets and apparent expanding investor confidence evident in new subscriptions. When reclassifications are excluded, IFs, measured by total shares/units in issue, increased in value to €819.8 billion at end Q1 2012, up from €768.7 billion at end Q4 2011. This increase is accounted for by revaluations of €34.9 billion and positive net transactions of €16.2 billion. ...

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  • The risk-free yield curve also has fundamental implications for financial stability. It defines the terms of maturity transformation in an economy. Partly because of regulation, the “safe” assets that banks and institutional investors hold on their balance sheets are largely government bonds. The yield on government bonds will influence other risk exposures taken by the financial industry. And it is long-term rates – not short-term rates – that help determine the prices of long-term assets.

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  • Written premium is commonly used in the property/casualty insurance industry as a measure of business growth. Therefore, an understanding of the components of written premium is necessary to evaluate growth correctly. Absent this understanding, a user of written premium information may misinterpret the true growth rate of an insurer, especially during periods of rapid change (such as a change in processing systems or transition to a different type of business.) In the simplest case, the policy premium is known and fixed in advance once the policy is sold.

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  • In describing her art, Louise Nevelson has written: “I do not belong to any movement. As my work is related to the present time, it is bound to be related to that of others, consciously or not....” Her art may be more closely related to her collections of African art, American farm tools, architectural elements, and diverse other fragments of the past and her attraction to the art and architecture of pre-Columbian Mexico and Central America.

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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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  • The rapid pace of change in the regulation of building energy performance has already created tremendous problems for the construction industry and the proposed acceleration of regulatory change towards zero carbon new buildings by 2020 will only widen the gulf between ambitious Government policy and the ability of the industry to deliver. The need for a radical overhaul in education and practice in the construction industry is urgent and undeniable.

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  • Although the global economic downturn and recent outbreak of swine flu have slowed Mexico’s economic recovery from its deep fall in the mid-1990s, and in many parts of the country the government continues to grapple with eradicating violence precipitated by the presence of drug cartels, Mexico continues to be an important market for real estate development and investment. Average annual foreign direct investment to Mexico tripled from $3 billion in the 1980s to $12 billion during the 1990s.

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  • This connection can be shown empirically, e.g. for commodities. Gorton and Rouwenhorst show that the yields on commodities futures have a negative correlation with the yields on long-dated bonds and – for long holding periods – with equities. Commodities futures could therefore be employed effectively in order to diversify equity and bond portfolios. 4 On the other hand, according to Yee’s analysis, high correlation coefficients are evident in a comparison of the yields on financial assets with those of metal or energy producers or with REITs.

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  • The HIV/AIDS pandemic constitutes a major threat to development in affected countries. The virus is spreading through different populations at varying rates, and prevalence rates among adults range from a fraction of a percent to well over 30 percent. In sub-Saharan Africa and parts of the Carib- bean, the epidemic is clearly established in the general population and is largely spread through heterosexual contact. Whatever the main means of transmis- sion, however, it is almost always the poor and the marginalized that are at greatest risk of exposure.

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