重庆西部速生桉树可持续发展战略探讨

针对重庆林业发展战略和桉树引种生产现状,提出了重庆西部发展速生桉树人工林的有利自然资源、引种培育与规划设计、分类经营与定向培育等可持续性战略措施.     

新世纪重庆桉树研究进展与发展策略

总结重庆桉树引种栽培历史、发展情况及在科学试验研究中取得的成绩,分析重庆桉树人工林的产业前景,并对今后重庆桉树发展提出建议.     

国外优良彩叶槭树引种可行性研究

本文通过比较济南与原栽培地美国波特兰的气候环境条件,并进行引种理论和拟引种槭树的生物学特性分析,结果说明从美国引种优良彩叶槭树是可行的,但需要采取一些技术措施。     

关于重庆区域性大农村经济发展的战略思考

当前，重庆经济发展走的是一条大城市带动大农村战略发展之路。但城市带动农村，用什么城市来带动，怎样来带动，是当前重庆经济发展尤其是大城市带动大农村经济发展战略下的农村经济发展的两大关节点。而以三峡库区为代表的重庆农村经济发展缺乏相应的中心城市来发展带动，因此必须制订新的、与重庆农村生产力相适应的经济发展带动战略，并做出相应的发展对策。     

临空临港经济与重庆的发展

探讨了依托重庆空港、重庆寸滩港发展临空临港经济,充分认识现代临空临港区域发展的内在规律与趋势,利用空港—河港—城市互动发展的动力机制,把握机遇、积极引导,推动重庆市城市和经济的健康快速发展,既是重庆城市发展面临的时代命题,更是一个重要的战略选择。     

重庆市高等教育与两江新区协作体系研究

重庆两江新区是国家西部大开发战略下辐射西部区域经济发展的重大战略举措,新区的发展需要重庆高等教育从人力资源和科学技术等方面提供更高层次的支撑,也为重庆高等教育的改革提供了动力和契机。在分析两江新区产业规划和重庆高等教育现状基础上,通过构建重庆高等教育与两江新区产学研协作体系,研究如何进一步发挥重庆高等教育在两江新区开发开放中的重要的人才支持和科研引领作用。     

重庆市旅行社业产业集群策略研究

从产业和战略的层面,以重庆旅行社业的产业集群为对象,研究重庆旅行社产业集群存在的障碍;从主业价值链的角度,分析重庆旅行社产业集群发展路径、集群化次序和格局,基于价值链的产业集群的建立,既有分工,各有侧重,又有联系。指出只有纵观全局的相互协调的发展战略模式,才能促进旅游的持续、快速、健康发展。     

重庆区域经济梯度差异及成因分析

以重庆40个区(市)县为单元,运用定量方法分析了重庆区域经济差异.分析表明,重庆区域经济发展存在显著的梯度差异,并可以划分为4种梯度区,梯度性差异的成因主要在于自然环境与区位,社会文化与科教水平,历史经济基础及政策方面,可为制定重庆区域经济协调发展战略提供依据.     

论西南地区高校学报发展战略

通过对西南地区高校学报现状的分析,提出了西南地区高校学报发展战略的构思。倡导以重庆直辖市高校学报为龙头,以四川省会成都高校学报为主力,成立西南地区高校学报联合体(学报编辑学会),带动川、黔、滇、藏4省区高校学报的发展;以省高校学报学会为主体,按专业分类,学报实行跨高校重组;并探讨了西南地区高校学报与国际接轨,入选国际检索期刊的可行性。     

借鉴欧洲经验,促进重庆农业产业化发展

针对重庆农业产业化发展的现状及存在的问题,借鉴欧洲国家农业产业化的经验,提出了进一步促进重庆农业产业化发展的战略措施。     

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