丁坝与挡土墙配合防护沿河公路路基机理分析

山区沿河公路常由于弯道水流冲刷而发生水毁.为进一步认识丁坝和挡土墙配合这一沿河路基水毁防治方案的防护机理,采用现代三维运动界面追踪技术VOF(volume of fluid)方法和标准k-ε模型耦合求解,对圆心角为90°弯道中设置丁坝的三维流场进行了分析研究,指出丁坝和挡土墙配合防护沿河路基是通过改变弯道水流的流场结构,使水流偏离被防护的路基或将冲刷区变为淤积区,从而达到冲刷防护目的的.     

挡土墙的设计与养护技术

公路是国家现代化建设的重要基础设施。而公路挡土墙在公路工程中被广泛的采用。本文通过对各种公路路基条件下挡土墙形式的介绍,详细阐述了公路挡土墙的设计方法,以及公路挡土墙在使用过程中的养护和加固技术。对加快我国高等级公路的建设和改善路网结构,保障公路畅通方面有一定的借鉴意义。     

浅析高速公路边坡防护治理

本文通过分析公路路基边坡的破坏形式及原因,分析了路基边坡防护设计原则,详细介绍了公路边坡的防护方法,以保证路基的稳定和防治各种路基病害,确保公路的正常使用品质及投资效益。     

山区公路挡土墙设计浅析

公路挡土墙是用来支承路基填土或山坡土体,防止填土或土体变形失稳的一种构造物。在路基工程中,挡土墙广泛用于支撑路堤和路堑边坡,减少土石方工程量和占地面积,防止水流冲刷路基,并经常用于整治坍方、滑坡等路基病害。     

公路路基边坡防护措施的探讨

分析路基边坡现存病因及公路路基边坡防护措施,为公路车辆安全行驶提供了重要保障,不仅稳定了路基又美化路容,提高了公路使用品质.并对公路边坡常见防护形式做了简单介绍.     

浅谈结构物的回填

对于公路建设来说不仅路基、路面是重要的组成部分，构造物也是保障公路运营安全的必不可少的部分。如何保障结构物与路基路面很好的衍接，结构物如何可以回填好是不容忽视。     

公路挡土墙的设计

公路挡土墙是用来支承路基填土或山坡土体，防止填土或土体变形失稳的一种构造物。在路基工程中，挡土墙可用以稳定路堤和路堑边坡，减少土石方工程量和占地面积，防止水流冲刷路基，并经常用于整治坍方、滑坡等路基病害。     

浅谈挡土墙设计的几点体会

本文以安康境内干线公路改建工程路基为实例,分析了各种挡墙在不同路段的合理使用,针对不同类型挡土墙分析其设计要点,总结设计体会.     

浅谈公路路基坡面加固与防护设计

公路路基坡面的加固和防护设计作为路基病害防治、环境景观改善、生态平衡保护、确保路基稳定最为重要的一项工程技术措施。在进行路基设计之时,要根据当地条件和道路性质的不同,并与路基排水和基身情况相结合,通过一定的防护加固举措对路基坡面加以保护。就公路路基的坡面加固和防护设计作了大致的论述,以期为我国公路设计提供可供参考与借鉴的资料。     

公路路基边坡防护施工技术研究

路基设计和公路养护都必须采用适当的防护设施。以达到路基稳定性、强度和刚度的各项标准,确保公路全天候正常使用。笔者就路基防护常用的浆砌片石防护和水泥混凝土预制板块防护方法进行了详细的阐述,以供读者参考。     

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