具有非线性接触率的SIRS传染病模型

本文研究了具有非线性接触率βＩ＾ｐＳ／１＋αＩ＾ｑ的ＳＩＲＳ传染病模型的正不变集，平衡位置以及平衡位置的稳定性。     

种群动力学非线性接触率的SI传染病模型的影响

本文研究了具有非线性接触βＩ＾ｐＳ／１＋αＩ＾ｐ－１的易感类中具有Ｌｏｇｉｓｔｉｃ增长的ＳＩ传染病模型的正不变集，平衡位置以及平衡位置的稳定性，对某些参数值，该模型能出现四个传染平衡位置。     

具有非线性接触率和种群动力学流行病模型

本文研究了具有非线性接触率和易感类中具有种群动力学的ＳＩＳ传染病模型的正不变集、平衡位置以及平衡位置的稳定性。     

种群动力学对非线性接触率的SI传染病模型的影响

本文研究了具有非线性接触率βＩｐＳ１＋αＩｐ－１和易感类中具有Ｌｏｇｉｓｔｉｃ增长的ＳＩ传染病模型的正不变集、平衡位置以及平衡位置的稳定性。对某些参数值，该模型能出现四个传染平衡位置     

催化动力学荧光法同时测定SCN^—和I^—

利用Ｉ＾－，ＳＣＮ＾－都对Ｃｅ（Ⅳ）与Ａｓ（Ⅲ）的氧化还原反应具有催化作用的特点，动力学荧光法测定Ｉ＾－１，ＳＣＮ＾－含量，又利用ＳＣＮ＾－对上述氧化还反应的催化活性在一定条件下会失去的特点。选择性测定Ｉ＾－，进尔计算出ＳＣＮ＾－的含量。     

Noether环的Grothendieck群

研究了Ｎｏｅｔｈｅｒ环的Ｋ０群，得到屯如下结果：设Ｓ为右Ｎｏｅｔｈｅｒ环，ＩＳ为投射右Ｓ－模，且Ｉ＾ｍ＝Ｉ＾ｍ＋１（ｍ〉０），ψ：Ｓ→Ｓ／Ｉ为自然同态，则Ｋ０ψ：Ｋ０Ｓ→Ｋ０（Ｓ／Ｉ）为满的群同态，并进而给出了在一些常见环上的应用。     

I2／2I^—非对称体系的光谱电化学研究

用ＦＯＳＥＣＳ测定了不同温度下Ｉ２／２Ｉ＾－电对的Ｅ＾０及ｎ值，由此求得了这一体系的热力学函数和条件平衡常数。     

应用离子选择性电极进行溶液热力学研究（X）^＊—RbCl在（ …

应用Ｃｏｒｎｉｎｇ一价阳离子选择电极（Ｍ＾＋￣ＩＳＥ）和Ｏｒｉｏｎ氯离子选择性电极（Ｃｌ＾－￣ＩＳＥ）组成可逆电池,即Ｃｌ＾－￣ＩＳＥ／ＲｂＣｌ（ｍ）,Ｈ２Ｏ（１－ｘ）,ＤＭＦ（ｘ）／Ｍ＾＋￣ＩＳＥ 通过测定上述测量电池的标准电动势（Ｅｍ＾０／ｍＶ）,根据溶液热力学原理,运用扩展的Ｄｅｂｙｅ－Ｈｕｅｃｋｅｌ公式,计算求得了ＲｂＣｌ由Ｈ２Ｏ至（Ｈ２Ｏ￣ＤＭＦ）混合溶剂的标准迁移自由能（ΔＧｔ＾０／ｋ     

Si^＋／As^＋双离子注入SI—GaAs对注入层电激活均匀性改？…

研究了单（Ｓｉ＾＋）双（Ｓｉ＾＋／Ａｓ＾＋）离子注入半绝缘砷化镓电激活的均匀性,结果表明,ＬＥＣＳｉ－ＧａＡｓ衬底中深电子陷阱能级均匀性分布好坏,对注入层电激活性有一定影响,当ＳＩ－ＧａＡｓ中碳含量小于５＊１０＾１５ｃｍ＾－３时,对注入层电激活影响不大,采用多重能量Ｓｉ＾＋注入,可改善栽流子纵向分布的均匀性,采用Ｓｉ＾＋／Ａｓ＾＋双离子注入可改善ＬＥＣ ＳＩ－ＧａＡｓ衬底中ＥＬ２横向不均匀分布对电     

壳聚糖交联膜对Sc^3＋的电渗析作用

研制了两种离子交换膜－壳聚糖交联膜Ｉ和壳聚糖交联膜ＩＩ，研究了这两种离子交联膜对Ｓｃ＾３＋的电渗析作用，考查了槽电压，溶液酸度和溶液浓度对电渗析的影响，同时对两种壳聚糖交联膜对Ｓｃ＾３＋的电渗析作用进行了比较，得出壳聚糖交联膜ＩＩ对Ｓｃ＾３＋的电渗析效果优于壳聚糖交联膜Ｉ的结论。     

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