长洲水利枢纽库区防护工程南安防护片施工导流设计

长洲水利枢纽库区防护工程南安防护片施工场地狭小,地形地质情况复杂,设计者根据当地的实际情况.提出了相应的导流方案,取得了良好的效果.     

某公路工程路基防护方案的选择

本文结合工程实践经验和本工程的实际情况,对本工程的路基防护方案进行选择。注意路基防护方案在满足了路基防护基本要求的同时,又能够注意保护环境、防护方案经济合理。     

浅谈铁路路基边坡绿色防护技术

本文分析了铁路路基边坡绿色防护技术的意义和优点,对植物防护的设计原则和植物选取做了介绍,最后重点阐述了国内几种主要的路基边坡绿色防护技术的特点、适用条件和应用情况。     

市政道路路基防护施工措施

市政道路是城市重要的基础设施建设,市政道路建设质量如何直接影响到城市交通的情况如何,也能够反映出城市道路建设水平如何,因此应该注重市政道路建设,其中影响市政道路建设质量的一个因素就是路基,如果做好道路路基防护施工,那么市政道路建设质量也能够有效的保证。本文主要通过对市政道路防护施工的基本原则的介绍,进而探讨了市政道路路基防护施工的措施,仅此提供借鉴。     

略谈临边防护的安全管理措施

临边防护工作是工作的头等大事,对安全防护工作不予重视等于犯罪。临边防护工作是个技术性和专业性较强的工作,做好安全防护工作,是施工现场杜绝安全隐患的可靠保证,应引起全体施工人员重视。目前存在少数施工管理人员对临边防护工作认识模糊,概念不清,意见不统一情况,影响安全防护工作的正常开展。     

跨线桥施工安全防护技术研究

文章结合宋家湾跨线桥施工情况,详细介绍了复杂环境下的安全施工防护技术,可供类似桥梁施工参考。     

煤矸石边坡生态防护施工技术研究

以娄底市龙琅高速煤矸石边坡防护工程为案例,提出了利用生态技术对煤矸石边坡进行防护,并对娄底的地质进行了调查,针对娄底边坡情况提出了对应的施工方案,并调查了所改造的效果。结果表明:生态系统能够自我维护,边坡稳定性有明显地加强。高速公路边坡防护工程的目的是在提高边坡稳定性及安全性,并结合防护措施及当地自然环境采用植被防护恢复新生界面,提高安全性的同时,符合绿色发展的工程建设宗旨,而且提高道路使用者的视觉感官享受。     

渭河流域堤防防护新技术的探究

本文着眼于现阶段水利工程建设中的研究热点,堤防防护,结合渭河流域实际情况,首先简要从水温、气候以及地貌这三个方面入手,分析了渭河流域的基本特征,在此基础之上,研究了适用于渭河流域的堤防防护新技术,旨在于引起各方工作人员的特别关注与重视,更好的保障堤防工程运行有效与可靠。     

浅谈公路填方路基的边坡防护设计

公路边坡防护质量对于公路交通运行的安全性有着直接的影响,公路填方路基在运行过程中会受到风沙侵蚀、暴晒以及风吹雨打等因素的影响,因此,路基边坡也很容易出现变形的情况,情况严重时甚至会影响路基结构的稳定性,开展公路防护工作的主要目的就是要提升边坡的防护效果,防止由于各类因素造成的塌方与陷落问题,本文主要分析公路填方路基的边坡防护设计方式与注意事项。     

浅谈公路填方路基的边坡防护设计

公路边坡防护质量对于公路交通运行的安全性有着直接的影响,公路填方路基在运行过程中会受到风沙侵蚀、暴晒以及风吹雨打等因素的影响,因此,路基边坡也很容易出现变形的情况,情况严重时甚至会影响路基结构的稳定性,开展公路防护工作的主要目的就是要提升边坡的防护效果,防止由于各类因素造成的塌方与陷落问题,本文主要分析公路填方路基的边坡防护设计方式与注意事项。     

会计确认、计量重心转移：理论分析、准则解释及应对策略

本文对资产负债观和收入费用观进行了比较研究，分析了二者的内涵和特征，探究了会计确认、计量重心转移的历史演变过程，阐释了会计确认、计量重心转移在我国新会计准则中的表现，并分别从会计信息供给者、管制者和使用者的视角对提高会计信息的决策有用性提出了建议。     

南水北调工程统计体系的建立与运行

南水北调工程统计体系在我国南水北调工程中发挥着重要作用,本文就简要的分析了南水北调工程统计体系的建立与运行情况,供广大同行参考。     

Trade Creation and Trade Diversion

SUMMARY

In this paper we raise questions regarding the appropriateness of the traditional gravity model for evaluating the existence of trade creation and trade diversion in the context of regional trade arrangements. We demonstrate that existing methods fail to separate multilateral and allocation effects, and are therefore unable to say anything useful about either. Further, we point out that omitted variables-perennially unobservables-further contribute to the contamination of the results. Bearing these criticisms in mind, we provide a new methodology for assessing the effect of preferential trading arrangements on the trade volumes, and hence, the welfare of member and non-member countries. We offer a test that separates these effects, and employ it in an assessment of the EC. We find that the allocation effects of the EC caused 5 of its 11 members to divert trade toward bloc members, and 2 of its members to divert trade away from the EC. We also find that the EC increased multilateral trade for both members and non-members.     

南水北调工程与河南内河航运联系的分析

本文简要阐述了河南省内河航运的发展过程,主要分析了南水北调工程和河南内河航运的内在联系,着重提出永久水源问题的解决方法。     

云南盈江遮坎多金属矿床成矿条件分析

通过分析云南省盈江遮坎多金属矿区区域及矿床地质特征,确定了该矿床为燕山期花岗岩体沿断裂构造、层间滑动构造贯入形成,从岩浆岩条件、构造条件、围岩条件综合分析了该矿床的成矿条件,从而指出了在该区进行下一步找矿的找矿标志。     

考虑实时交通情况的配送优化模型

通过分析现代物流配送的新特点、城市交通的新情况以及道路交通情况对配送计划的影响,在考虑时间窗、交通情况、车辆限制、拥挤成本等因素的基础上建立了考虑实时交通情况的配送优化模型,并介绍了模型的软件实现,分析了模型所得的结果。     

Poverty Orderings

This paper reviews the literature of partial poverty orderings. Partial poverty orderings require unanimous poverty rankings for a class of poverty measures or a set of poverty lines. The need to consider multiple poverty measures and multiple poverty lines arises inevitably from the arbitrariness inherent in poverty comparisons. In the paper, we first survey the ordering conditions of various individual poverty measures for a range of poverty lines; for some measures necessary and sufficient conditions are identified while for others only some easily verifiable sufficient conditions are established. These ordering conditions are shown to have a close link with the stochastic dominance relations which are based on the comparisons of cumulative distribution functions. We then survey the ordering conditions for various classes of poverty measures with a single or a set of poverty lines; in all cases necessary and sufficient conditions are established. These conditions again rely on the stochastic dominance relations or their transformations. We also extend the relationship between poverty orderings and stochastic dominance to higher orders and explore the possibility and the conditions of increasing the power of poverty orderings beyond the second degree dominance condition.     

Nonparametric Efficiency Analysis under Price Uncertainty: A First-Order Stochastic Dominance Approach

This paper extends the nonparametric approach to efficiency analysis to deal with uncertainty of input-output prices. We generalize the notion of economic efficiency to derive necessary and sufficient first-order stochastic dominance (FSD) efficiency conditions. Interestingly, the FSD conditions include as limiting cases the traditional conditions for economic efficiency and technical efficiency. Furthermore, we propose empirical tests for these FSD conditions, which require minimal assumptions concerning the preferences of the decision-maker and the statistical distribution of the prices. From operational point of view, the FSD conditions can be tested empirically using standard mathematical programming techniques. An empirical application to the Dutch electricity distribution sector illustrates the approach.     

Estimating dynamic models from repeated cross-sections

An important feature of panel data is that it allows the estimation of parameters characterizing dynamics from individual level data. Several authors argue that such parameters can also be identified from repeated cross-section data and present estimators to do so. This paper reviews the identification conditions underlying these estimators. As grouping data to obtain a pseudo-panel is an application of instrumental variables (IV), identification requires that standard IV conditions are met. This paper explicitly discusses the implications of these conditions for empirical analyses. We also propose a computationally attractive IV estimator that is consistent under essentially the same conditions as existing estimators. While a Monte Carlo study indicates that this estimator may work well under relatively weak conditions, these conditions are not trivially satisfied in applied work. Accordingly, a key conclusion of the paper is that these estimators cannot be implemented under general conditions.     

强化条件意识 提高化学素养

各种化学概念或原理的都有一定的适用条件,化学反应在一定的条件下才能朝着预期的方向进行,化学实验的成功离不开多种条件的调控,化工生产流程问题中条件分析。这些条件的学习,有利于提高学生的化学素养。