杉木炭疽病预测预报研究

杉木炭疽病流行的时间动态类型介于单年流行病害与积年流行病害之间或者更接近于积年流行病害类型 ,遵循逻辑斯蒂模型。依据 1991- 1993年在福建省三明市的调查资料 ,采用逻辑斯蒂模型建立该病的中期预测预报方程 :ln[x2 / (1- x2 ) ]=- 1.990 91 0 .0 2 72 2 4 T 0 .0 0 794 4 U- 0 .0 0 0 913R 0 .5 912 0 2 ln[x1/ (1- x1) ],模外数据检验表明该预测模型具有较高的可靠性 ,可供生产上使用。     

石拱桥病害分析与加固措施探讨

本文主要结合北流市农村公路小桥的现状,对该地区建于上世纪60年代,孔径5～10米的约10座的石拱桥的病害做了分析,主要病害归纳为基础冲空、拱圈出现裂缝、桥面及栏杆破损等。本文对病害的产生做了分析,并对加固处理措施作了探讨。     

沥青混凝土路面早期病害的分析与对策

本文对沥青混凝土路面的几种较常见的病害类型、病害的成因、预防病害的措施和维修方法做了简要的叙述。     

浅谈沥青混凝土路面病害及其防治

本文对沥青混凝土路面的几种较常见的病害类型、病害的成因、预防病害的措施和治理方法做了简要的叙述。     

SolidWorks软件的特点、应用与展望

介绍了SolidWorks软件主要发展历程 ,并以SolidWorks2 0 0 3为例阐述了该系列软件的特点 ,接着对SolidWorks软件的应用做了概述以及对发展前景作了展望 ,然后介绍了SolidWorks2 0 0 4的一些新增特性     

浅谈小麦锈病、白粉病的成因以及防治措施

小麦锈病、白粉病、雪腐病是新疆南北各地常见的病害,研究病害的成因、寻求解决的措施对农业的稳产、农民创收有着非常重要的作用。本文新疆各地常见病害做一些粗略的探讨,寻求预防病害的有效措施为主要目的。     

公路沥青路面日常养护中病害的识别及形成原因

公路沥青路面在日常养护中通常会发现很多路面病害，但公路路面病害种类繁多，形成原因多元化，最新的公路技术状况标准将沥青路面病害分为11类21项。现结合公路日常养护中所常见的病害对沥青路面病害的识别方法及形成原因做简单介绍。     

对甘肃地区沥青公路路面病害及结构优化设计研究

本论述介绍了我国甘肃地区沥青公路路面病害现状,主要以甘肃省河西地区的沥青公路为例,并且分析了其病害原因,提出了一些防止沥青面层产生损坏的措施,然后针对损害做了一些结构上的优化设计,争取为减少沥青公路路面病害作出贡献。     

公路桥过渡墩U型破裂面原因分析

近年来交通流量的急剧增大和车辆的载重量增加,使一些早期建成的桥梁出现了各种严重病害成为危桥.本文针对南海竹莆桥的过渡墩身出现的U型破裂面,通过采用建立仿真的实体有限元模型进行了分析计算,对产生这种病害的原因做了深入分析.     

浅析青藏铁路P50再用轨病害成因及整治

1　概况　西宁铁路分局柯柯工务段地处青藏铁路线中部 ,管辖 3 12ｋｍ铁路正线 ,截止 2 0 0 0年底 ,技术设备Ｐ5 0钢轨为95ｋｍ、Ｐ43钢轨为 2 17ｋｍ。近年来 ,由于列车通过总重的增加和运行速度的提高 ,我段与 2 0 0 1年 3月承担了青藏线Ｋ3 5 6—Ｋ44 0区段的 84ｋｍＰ43型钢轨更换Ｐ5 0型再用轨的工程。该工程于 2 0 0 1年 10月全部完成 ,但交付养路工区运营后 ,每个工区除了原有人员配备不动外 ,又新增民工10人之多 ,随时对这个区段的线路进行维修和保养 ,然而这里仍然病害增多 ,普遍存在的晃车问题仍然严重存在。为此 ,我段与 2 0 0 1…     

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