基于GIS的土地利用动态监测：以民勤试验区为例

以甘肃省民勤县城关镇毗邻的４个乡镇为典型试验区,利用遥感与ＧＩＳ相结合的技术方法,重点监测了近１０年来该地区土地利用的具体变化状况。并在地物光谱研究的基础上,提出了适合试验区实际情况的遥感波段组合（ＴＭ Ｒ１Ｂ４Ｇ６）和分类方法（贝叶斯方法）。对该实验区而言,这种波段组合效果最佳,贝叶斯分类的总精度也达到８８．５１％。对经制图综合而获得的土地利用专题信息,通过数据转换、软件接口与不同时期的土地利用     

MPEG视频业务特性的模拟研究

可变比特主经（ＶＢＲ）ＭＰＥＧ视频是一种ＶＢＲ视频类业务，有着广阔的应用前景，然而这种业务的特性还没有得到透彻地研究，本文根据对真实的视频数据的计算机模拟分析，介绍了ＶＢＲＭＰＥＧ视频的基本统计特征、自相关函数特征和分布密度函数特征、根据ＭＰＥＧ视频的特点对ＭＰＥＧ视频业务的统计复用方式分类进行了研究，并对各类复方式的性能作了详细分析比较。     

一种基于色差分析的彩色图像压缩编码新方法

提出一种应用色差分析和小波变换对彩色图像进行压缩编码的新方法,该法是对彩色图像的三个色彩分量之一,如ＲＧＢ图像的Ｇ进行波变换编码,而对Ｇ与另外两个色彩分量的差值（ＲＧ和ＢＧ）进行色差分析编码,解码则是通过反量化和小波逆变换得到Ｇ,通过色差分析的逆变换得到两个重构的色差ＲＧ－和ＢＧ,再由Ｇ分别与ＲＧ,ＢＧ之和得到Ｒ,Ｂ,最后Ｒ,Ｇ,Ｂ重构图像,实验结果表明该方法编（解）码速度快,并有较好的信噪比,压     

有限特殊射影酉群U3（q）的一个新刻划

设Ｇ为有限群，如对每一个质数ｒ都有│ＮＧ（Ｒ１）│＝│ＮＵ３（ｑ）（Ｒ２）│，那么Ｇ≌Ｕ３（ｑ），此处Ｒ１∈ＳｙｌｒＧ，Ｒ２∈Ｓｙｌｒ（Ｕ３（ｑ）），ｑ≥３。     

IFR型寿命分布的随机比较

研究了ＩＦＲ分布在修理更策略中的随机比较,得到了对不同部件相同策略的两个比较结果,即假设－／Ｆｄ（ｔ）≥－／Ｇｄ（ｔ）,且Ｆ或Ｇ是ＩＦＲ,得到Ｎｍ,Ｆ随机地小于等于Ｎｍ,Ｇ;Ｎｍ,Ｆ（Ｚ）随机地小于等于Ｎｍ,Ｇ（Ｚ）。     

R（G）=—1的图的伴随唯一性

用Ｒ（Ｇ）表示Ｇ的特征标，本文证明了若干类Ｒ（Ｇ）＝－１且Ｐ（Ｇ）≥ｑ（Ｇ）的伴随唯一性。     

群分次环上双积对偶定理

用环论的方法证明了群分次环上的双积对偶定理，主要结果是当Ｇ为有限群时，Ｒ＃ｋＧ＃。ｋＧ≌ＭＧ（Ｒ），当Ｇ为无限群时，Ｒ＃ｋＧ＃ｋＧ≌ＭＧ（Ｒ）＾ｆｉｎ。     

海南岛五指山的森林植被Ⅰ．五指山的森林植被类型

本部分仅对五指山森林植被类型进行科学的划分和描述。五指山森林植被自下而上可划分为热带低地雨林（海拔７００～１０００ｍ）、热带山地雨林（海拔１０００～１４００ｍ）、热带亚高山矮林（海拔１４００～１７００ｍ）、热带山顶灌丛（海拔１７００～１８６７ｍ）等４个原生植被类型，共１０个群系。     

Ramsey极图的性质

本文在引进Ｒａｍｓｅｙ数Ｒ（ｍ，ｎ）的饱和极图Ｇ（ｍ，ｎ）的概念后，证明了Ｇ（３，ｎ）中每个顶点必至少是一个五边形的顶点以及Ｇ（３，ｎ）中至少含有个互不相交的五边形等定理；最后还证明了一个新的下界定理，从而改进了一批Ｒａｍｓｅｙ数的下界，例Ｒ（４，１５）≥１２２，Ｒ（５，９）≥９９等．     

无菌大鼠的开发与应用研究

实验大鼠是用途广，用量多的实验动物之一。长期以来，我国一直缺乏标准大鼠的生产供应。为加速我国实验动物的标准化进程，我们历经四年，人工培育了无菌大鼠（ＧＦＲ），建立了相应的已知菌大鼠（ＧＮＰＲ）、无特定病原体大鼠（ＳＰＦＲ）以及清洁级大鼠（ＣＬＲ）种群。对ＧＦＲ的生物学特性进行了较系统的测定。以ＧＦＲ、ＧＮＰＲ和ＳＰＦＲ为模型的肠道细菌易位途径、糖尿病等方面的研究，以及ＣＬＲ的推广生产都取得了可喜的成绩，产生了较好的社会经济效益。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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