基于3S技术的棉花估产研究

适时地预测棉花的产量对于科学指导棉花生产具有重要意义.文章论述了遥感技术在新疆棉花遥感估产中具体应用.以现代RS、GIS技术为基础的空间调查,同时结合详细的地面调查资料对新疆棉花遥感监测、棉花种植面积计算、棉花估产,系统地介绍了在棉花种植面积遥感估产过程,以及基于背景数据的不同土地类型上的棉花产量遥感解译.     

基于CBERS-2卫星图像的石河子地区棉花产量遥感监测研究

<正>引言随着现代计算机技术的发展,卫星遥感分辨率的提高,应用卫星遥感信息监测农作物面积、估算其产量已从理论研究走向应用阶段。通过遥感技术的发展和应用,为作物的种植面积调查、长势监测和产量估算提供了一个新的科学手段。新疆是我国重要的产棉区。新疆的棉花生产不仅对新疆的经济,对全     

长江流域棉花种植面积变化遥感监测--以安庆市和池州市为例

决定棉花产量的关键因素之一是棉花的种植面积,适时准确地掌握棉花的种植面积对于科学指导棉花生产具有十分重要的意义.文章以安庆市、池州市为例,系统地介绍了在棉花种植面积遥感监测过程中,通过土地利用背景数据库建设,以及基于背景数据的棉花种植面积遥感解译,准确地监测了棉花种植面积及其变化率.结果显示长江流域棉花主要集中分布于沿江的洲圩区,其次分布于沿江的岗地和丘陵;在2001～2002年度,棉花种植面积变化主要是减少,在2002～2003年度,棉花种植面积变化主要是增加.究其变化的原因,主要受棉花市场价格和气候条件的影响.     

遥感监测在公安系统的应用研究

高分辨率遥感数据具有高质量、高清晰度、多层次、高重访周期等特点,利用高分辨率遥感影像,可以提升公安日常业务和应急处突过程中准确判断和快速反应的能力。公安对于高分辨率遥感数据的应用尚处于起步阶段,亟需对利用高分遥感数据进行公安各警种的应用开展研究和实践。在分析公安各警种对高分遥感监测的业务需求的基础上,阐述高分公安重要地区遥感监测系统和数据平台的建设思路,并分析公安遥感监测应用需要研究的关键技术,为公安开展高分遥感应用提供厂方法和思路。     

新疆棉花植保文献检索系统的开发

结合新疆实际，对棉花的主要病、虫、草害以及防治技术等相关信息进行系统、科学的整理和有序化存储，开发出图文并茂的新疆棉花植保文献检索系统。全库采用国际流行的全息检索技术，具有多种运算方式，检索速度快捷、用户界面友好，是一种能识别棉花病虫草害和查找相关防治技术信息的工具。     

天津市生态环境监测与评价

采用遥感监测为主、地面监测为辅的立体监测技术手段，建立生态环境监测指标和评价方法，并对天津全域进行了生态环境监测与评价。     

素烧窑生产过程计算机监测系统设计

针对陶瓷生产的需要，研制了一种应用于素烧窑生产过程监测的工业计算机控制系统，介绍了系统的设计思想和主要功能，软硬件结构和实现方法，该系统具有功能齐全、操作方便、性能价格比高等优点。     

都市区城乡建设遥感监测系统研究与试验

介绍了运用遥感技术手段,建立重庆市都市区城乡建设遥感监测系统的研究与试验工作。研究了面向城乡建设规划管理需要的遥感影像预处理、信息提取、综合分析以及解译分类标准：提出了一种典型的都市区城乡建设监测系统的设计方案并介绍了该系统的实施和运行情况。     

高光谱分辨率遥感在植被监测应用中的关键技术及应用

高光谱遥感数据已成为地表植被地学过程中对地观测的强有力的工具．综述了利用高光谱遥感数据进行植被监测的研究进展，主要包括以下二个部分：（1）高光谱遥感用于植被监测中的关键技术（2）高光谱遥感数据在植被生长监测中的应用．     

中国海透明度卫星遥感监测

传统的海水透明度监测方法是利用船舶等进行实测。由于船测本身固有的缺点，满足不了当前对海洋要素大范围、快速、实时监测的需求，必须结合卫星、航空遥感等手段，进行立体监测。文章以海水透明度为突破口，开展中国海透明度的卫星遥感监测。结果表明，利用卫星遥感技术反演海水透明度精度可以达到相对平均误差22.6%，在中高透明度海区，具有更高的反演精度。利用建立的海水透明度遥感反演算法和SeaWiFS卫星遥感数据，制作了两年的中国海透明度遥感产品数据集，并利用该产品，对中国海透明度的时空变化规律进行了遥感分析。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the