常微分系统中持续摄动下部分变元的有界性和稳定性

关于部分变元运动稳定性的研究自１９５７年РумянцевВ．В．的文章发表以来，引起了世界上许多人的兴趣．持续摄动下整体变元的有界性和部分变元的稳定性自本世纪６０年代和８０年代分别由Ｙｏｓｈｉｚａｗａ，Ｔ．和Озиранер，А．С．引入并研究以来，得到了数学界和工程界的广泛重视．但是，持续摄动下关于部分变元的渐近稳定性和有界性还从未有人研究过，本文对这一问题提出了新的概念并对摄动函数作了一定要求后得到了相应的结果，而Ｙｏｓｈｉｚａｗａ，Ｔ．和Озиранер，А．С．的结果就成了本文结果的特殊情形     

等舒适性转轮除湿空调系统性能

分析了太阳能作为再生热源时等舒适性室内状态点下，两种类型的转轮除湿、蒸气压缩和蒸发冷却相结合的转轮除湿空调系统，建立了系统的物理模型并对系统进行数学描述，通过与相同条件下常规蒸气压缩空调系统的计算比较分析，得出转轮除湿空调系统的空气质量流量减少了9．74％，制冷剂质量流量分别减少59．7l％和71．43％；压缩系统性能系数分别提高了11．78％和16．38％；压缩机能耗分别节省了64．17％和76.35％；总负荷能耗分别节省了34．23％和42．32％．在室外工况不同时，发现在干热的气候条件下（如河南三门峡），系统节能明显，分别达到了69．94％和78．01％；而在湿热的气候条件下（如安徽蚌埠），系统节能不明显，但仍达到16．13％和23．82％．     

~（90）Zr（n，2n）~（89）Zr反应截面测量

用活化法以９３Ｎｂ（ｎ，２ｎ）９２ｍＮｂ反应截面为中子注量标准，对９０Ｚｒ（ｎ，２ｎ）８９Ｚｒ反应截面进行了测量．测得的１３．６４，１３．８０，１４．０１，１４．３５，１４．６２和１４．８０ＭｅＶ中子引起的９０Ｚｒ（ｎ，２ｎ）８９Ｚｒ反应截面值分别为４８３．０±１０．６，５３９．７±１１．９，６０６．３±１３．３，７１０．６±１５．６，７７５．４±１７．１和８２５．５±１８．２ｍｂ．单能中子由Ｔ（ｄ，ｎ）４Ｈｅ反应获得，中子能量由硅控测器法测定．并把本工作的数据和其他一些作者的数据进行了比较     

图像数据库基于内容检索的索引方法研究

为了提高图像数据库的检索效率，必须提高高维索引的效率．通过对SR-tree和x-tree的结构和性能分析，引入X-tree中超级节点的思想，改进了分裂算法，设计了一种新的高维索引结构ESR-tree（Extended SR-tree）．ESR-tree采用超矩形和超球形相结合的包络方法，在节点结构中引入超级节点．通过改进插入和分裂算法，有效降低了重叠率，避免了不必要的分裂，更好地维持树的平衡．同时有效降低了CPU时间和I／O次数，提高了检索效率．实验表明，随着数据量和维数的增多，ESR-tree的性能明显优于SR-tree和X-tree．     

CH_2FCF_3－CH_3CHF_2和CH_2FCF_3－丙酮两二元系的气相

在自制的气相ｐＶＴｘ关系测定装置中，通过测定加料总量（ｎ＿Ｔ）、加料组成（ｘ）以及处于平衡时的温度（ｔ）和压力（ｐ），测得了１，１，１，２．四氟乙烷－１，１－二氟乙烷在２５．００，３０．００，４０．００，５０．００，６０．００和７０．００℃以及１，１，１，２－四氟乙烷－丙酮在２５．００，４０．００，５５．００和７０．００℃时的气相ｐＶＴｘ数据。使用改进的ＰＲ状态方程，成功地关联了实验数据。     

二胺型螯合树脂的合成与性能研究

采用直接缩聚反应合成了一种新型二胺交联螯合树脂，测试了树脂的溶胀性能和对金属离子的静态吸附容量．实验结果表明，树脂在20℃的水和甲酸中溶胀系数分别达到3．07和7．75；25℃时，对Hg^2 ，Cu^2 ，Ni^2 的吸附容量分别达1．16，0．93和1．68mmol／g．     

低公害混合氯氟烃（R22－R142b）汽液平衡的研究

自行设计、安装、调试了一套测定汽液平衡的装置，并建立一种取样分析方法，可用于测量低压至高压的压力范围．用此装置和分析方法于２８３．１Ｋ，２７８．０Ｋ，２７３．３Ｋ，２６８．１Ｋ，２６３．０Ｋ，２５８．２Ｋ，２５３．１Ｋ和２４８．０Ｋ共８个温度下，测定了Ｒ２２－Ｒ１４２ｂ二元系统汽液平衡（ＶＬＥ），压力范围由６５．８６ｋＰａ至６２１．１２ｋＰａ．实验数据通过了热力学一致性校验。并用状态方程法进行了关联，取得比较满意的结果．     

高精度自动化椭圆偏振光谱仪

报导了４８６／８０计算机控制的自动化的转动检偏计式的光度法椭圆偏振光谱仪的设计和制造．仪器主要由光学系统、机械转动控制系统和数据采集系统组成．其频谱范围２００～９００ｎｍ，入射角可在５～８５°连续改变，灵敏度达０．１μＷ光强，有很高的精密度，折射率ｎ达０．００２量级，消光系数ｋ达０．００３量级，准确度ｎ达０．００１量级，ｋ达０．００２量级．实验检验了仪器的精密度和准确度．并讨论了其应用     

从脉搏信号中准确提取呼吸和心率信息的新方法

采用功率谱估计的方法，从脉搏信号中准确提出了人体呼吸频率和心率值．结果表明，正常人的静息心率有很大差异，一般为0．625～1．615Hz(均值为1．025Hz)，且呼吸频率的变化范围宽(男性为8．5～21．2次／min，女性为12．4～26．5次／min)．对人体四种脉象信号功率谱能量及其分布进行了计算和比较，为揭示呼吸对脉象影响的机理和估计心率的稳定性提供了依据．     

（0,1）——矩阵类U（R,S）的势函数

讨论了（０，１）－－矩阵类Ｕ（Ｒ，Ｓ）中所含指定的行和向量Ｒ＝（ｒ１，ｒ２，．．．，ｒｍ），列和向量Ｓ＝（ｓ１，ｓ２，．．．，ｓｎ）的（０，１）－矩阵的势ｆｍ，ｎ（Ｒ，Ｓ），给出了求ｆｍ，ｎ（Ｒ，Ｓ）的递归公式。     

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