費料分佈 的英文怎麼說
中文拼音 [bìliàofēnbù]
費料分佈
英文
fermi distribution-
Taking xinzhou city as the case, the paper analyzes the city ' s actual situation of water supply, available water sources and their amount, distribution and development. it also calculates the mid and long term needed water amount and insufficient water amount in the city. taking the natural, commercial and life material properties and environmental function of water sources into full consideration, taking the satisfaction of the needed amount of the city and the balance and the largest capacity of every water source as the prerequisite, the paper aims at the mid and long term water supply sources ( north water sources region, douluo water sources region, shuiquanwan water sources region ) and the lest spending on the investment and operation of the self - equipped wells ; through the determination of decision variables, a model of economic management for the city ' s water supply is established, witch carries out the mid and long te rm optimal operation of water supply for the city
本文以忻州市為例，分析了忻州市供水現狀，可供水水源、水資源量、分佈及開發利用情況，預測了中長期需水量和缺水量，充分考慮水資源的自然屬性、生活資料屬性、商品屬性和環境因素功能，通過決策變量設置，在保證城市需水量、水資源平衡和各供水水源最大供水能力的前提下，以開采忻州市中長期供水水源（北水源地、豆羅水源地、水泉灣水源地）和自備井開採的投資和運行費用最低為目標，建立了城市供水水源優化調度經濟管理模型，運用線性規劃方法進行了城市中長期供水水源優化調配。The main work can be summed up as follows : firstly, we studied the thermal - field properties of vcsels, and analyzed the influences of current spreading, material parameters and operating conditions on the temperature distributions. secondly, we began with the electrode voltage and calculated the equipotential s distributions, compared the distributions of voltages and current densities in different depths of vcsels, and then studied the influences of the oxide - confining region with different position or thickness, and the different sizes of the gain - guided aperture and emitting window on the distributions of the injected current density, carrier concentration and temperature in the active region. thirdly, we realized the coupling of electricity, optical and thermal - fields, worked out the threshold voltage, calculated the distributions of the injected current density, carrier concentration and temperature under different offset voltages, and analyzed the impacts of temperature profile and carrier density on the refractive index, fermi levels and optical - field
具體工作可以概括如下：首先，研究了vcsel的熱場特性，分析了電流擴展，材料參數和工作條件對于溫度分佈的影響；其次，從電極電壓入手，計算出激光器中的等勢線分佈，並對不同深度處的電壓和電流分佈進行比較，研究了高阻區的不同位置和不同厚度、限制層和出射窗口半徑的大小對電流密度、載流子濃度和溫度分佈的影響；再次，實現了電、光、熱耦合，求出了閾值電壓，計算了不同偏置電壓下的電流密度分佈、載流子濃度分佈和熱場分佈，分析了溫度和載流子濃度變化對折射率、費米能級和光場的影響；最後，給出了考慮n - dbr和雙氧化限制層時激光器中的等勢線分佈，分析了n - dbr和雙氧化限制層對vcsel電流密度、載流子濃度、溫度和光場分佈的影響。By an analysis of the statistical data of 2003 from the national agricultural technology center and the data of peasant household survey in 2000, the conditions are depicted of the spatial distribution and product mix of the consumption of nitrogenous fertilizers in china and the crop demand
通過對全國農技中心2003年統計數據和2000年農戶調查數據的分析，闡明了我國氮肥消費的空間分佈、品種結構和農作物需求狀況；並指出了農作物氮肥施用中存在傳統施肥習慣影響氮肥消費結構，氮肥施用面積不足、適量和超量各佔三分之一，施肥方式影響肥料利用率，氮肥價格的上漲也影響氮肥消費結構等問題。Moreover, much of information reflecting space - time distributing regularity of these fields ca n ' t be displayed timely, frankly, visually and completely. so the researchers may not communicate enough with the leaders of decision - making departments, which affects the measure making of environmental harness. today, the rapidly improved remote sensing ( rs ) and geologic information system ( gis ) provide quite good methods for tackling these problems
長期積累的環境觀測資料往往得不到充分利用而造成信息浪費，正在迅速變化的環境信息又得不到及時補充，此外，由於反映礦區環境地質條件時空分佈規律的大量信息難以及時、直觀、形象全方位地展現出來，使研究者及其研究成果不能很好地與領導和決策部門溝通，影響到環境治理措施的制定。分享友人