The core issue of nutrient control was focused and the dynamic studies on phosphorus pollution of the whole watershed were conduced: 1 to highlight the non-point source pollution control, which is the difficulties research subject of water resource protection; 2 to perfect the calculation method for phosphate input and output, providing important basis on decision making for nutrient control; 3 to establish database and water quality model, to predict the water quality response after different phosphorus control schemes realized; 4 to determine admissible phosphorus loading and control standard according to the quantitative relationship between the external force function (mainly the exotic nutrient salt concentration or loading) and internal nutrient state response, and to work out the effective and practical techniques for eutrophication control.

圍繞營養(yǎng)鹽控制的核心問題爱情岛亚洲成年永久网站，進行全流域范圍磷污染的動態(tài)研究：1）突出了目前我國水資源保護研究難點—非點源污染控制；2）完善了流域水庫磷鹽收支計算方法，為流域營養(yǎng)鹽控制決策提供了重要依據；3）建立數據庫和水質模型黄色视频久久久久，預測了在實施不同磷削減控制方案后流域供水水質的響應情況；4）根據湖泊外力函數（主要是外來營養(yǎng)鹽濃度或負荷）與湖庫內營養(yǎng)狀態(tài)響應間的定量關系亚洲色婷婷开心综合，確定了磷允許負荷量及控制標準射一射人人操一操，提出了有效的富營養(yǎng)化控制實用技術。

The research progress on synthetic allopolyploid including type, inducement method and utilization status in crop genetic improvement were summarized, and the feasibility and importance for using it to improve crop varieties were discussed. Finally, the existing problems in relevant researches were analyzed, and the future studies were prospected.

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The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

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These studies could provide the basic data and research achievement on analysis the difference of plant transpiration and water consumption between different tree species. It contribute to instructional significance to regulate and control the moisture relations between every factor, and solve contradiction between moisture providence and demanding. At the same time, It will be provided the theoretical evidence for plants choosing and arranging ,and properly using water resources in arboriculture and maintenance.

這些研究為分析造成不同樹種之間蒸騰耗水的差異提供了基礎資料，對于調控各因素之間的水分關系绿帽人妻91社区，解決水分供需關系矛盾有重要的指導意義国产拍在线视频，同時也為植物選擇與配植，栽培與養(yǎng)護中合理地利用水資源提供了理論依據看片免费w。

Based on the previous studies and combined with the national important scientific special item—the projection of water environment improvement and comprehensive demonstration in Suzhou city. The influence to water quality melioration under different conditions of packing types, stuffing rate, air supply and hydraulic loading using water of Miaojia river as experiment water sample; the water contaminate removal ability by the absorption and interception of charcoal filling and the research of the denitrification rate of charcoal filling were discussed in the paper. Furthermore, the activity of the biofilm on savageness and artificialness filling surface in the projection demonstration riverway were also analyses.

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There are ten deemed universities in the capital namely the Indian Agricultural Research Institute , Indian Institute of Foreign Trade , Indian Law Institute , National Museum Institute of History of Art, Conversation and Museology, National School of Drama , Rashtriya Sanskrit Sansthana, School of Planning and Architecture, Shri Lal Bahadur Shastri Rashtriya Sanskrit Vidyapeeth , TERI School of Advanced Studies and National University of Educational Planning and Administration .

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Its research areas Include: Climatology and biometeorology; Rainfall and its biological effects; Erosion and the deposition of sediments: dust storms; Dunes, their structure and formation; Microclimatology; Dew and hygroscopic moisture; Soil flora and fauna in arid lands; Seed germination and its improvement; Vegetational studies in desert regions worldwide; The physiology and ecology of plants and animals; Foraging patterns of mammals; Parasites and predators; Diurnal rhythmicity and phenology; The impact of grazing; Wildlife conservation; Anthropology and sociology of desert peoples; Oasis settlement; Human ecology and traditional land use; Land classification and improvement; Water control; Remote sensing; Desertification, its causes and control.

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The journal dedicates to the studies in all aspects of the botany, mycology and phycology of the South Pacific, Australia, South America, southern Africa and Antarctica. Research areas include biosystematics and biogeography, ecology, physiology and biochemistry, genetics and reproductive biology, structure and development, ethnobotany, palaeobotany, bryology, lichenology and plant pathology etc.

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Based on intensive investigation of original sources and research literatures on the subject in consideration,and under the paradigm why mathematics was done in the history of mathematics,the dissertation studies systematically the origin and invention of the calculus of variations by means of source analysis and comparative argumentation.

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