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Integrated Solution to the Problem of Resource-Saving Fixing of Moving Sands 流沙资源节约型固定问题的综合解决方案
Pub Date : 2019-03-28 DOI: 10.19080/cerj.2019.07.555723
M. Mirakhmedov
Introduction Deserts and semi-deserts occupy 31.4 million km2 on the surface of the Earth, including the Sahara (covers 11 countries of North and West Africa), and Namib (South Africa, Namibia) in Africa, Rub al-Khali (Arabian Peninsula), DashtiNaumid (Iran), Karakum and Kyzylkum (Turkmenistan, Uzbekistan, Kazakhstan, Tar (Pakistan, India), Gobi and Takla-Makan (China) in Asia, Mojave with its Death Valley in North America, the Great and Small Sandy Deserts, the Simpson Desert in Australia [1]. Building engineering communications in these conditions over the past two centuries have tended to expand. Eniyu [25] Construction sandy deserts associated with the negative impact of exogenous process deflation and its activation brittle fracture bioravnovesiya-destruction of vegetation, which is formed very slowly [6-11]. In the Republic of Uzbekistan, mobile sands occupying more than 30% of the territory are sources of blowing and drifting irrigation networks, roads and railways, gas pipelines and, as a result, the reason for reducing the safety of their operation [12]. Therefore, in the construction and operation of engineering structures in sandy deserts, the problem of protecting them from blowing and from drifts is given significant importance [13-15].
地球表面的沙漠和半沙漠面积为3140万平方公里,包括撒哈拉沙漠(覆盖北非和西非的11个国家)、非洲的纳米布(南非、纳米比亚)、鲁卜哈利(阿拉伯半岛)、DashtiNaumid(伊朗)、卡拉库姆和Kyzylkum(土库曼斯坦、乌兹别克斯坦、哈萨克斯坦)、塔尔(巴基斯坦、印度)、亚洲的戈壁和塔克拉玛干(中国)、北美的莫哈韦及其死亡谷、大沙漠和小沙漠、澳大利亚的Simpson沙漠[1]。在过去的两个世纪里,在这些条件下的建筑工程通信有扩大的趋势。Eniyu[25]建设沙质沙漠与外源过程收缩及其激活的负面影响有关,其形成非常缓慢[6-11]。在乌兹别克斯坦共和国,占国土面积30%以上的流沙是吹漂灌溉网、公路铁路、天然气管道的来源,也是降低其运行安全性的原因[12]。因此,在沙漠工程结构的建设和运行中,防风、防漂问题显得尤为重要[13-15]。
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引用次数: 2
Law Education for Civil engineers 土木工程师的法律教育
Pub Date : 2019-03-26 DOI: 10.19080/cerj.2019.07.555722
K. Holschemacher
As demanding the job of a civil engineer is, as challenging are the today’s legal requirements on construction projects. Nevertheless, there is widespread opinion that civil engineering is a profession where legal knowledge and skills are not necessary at all. But construction projects normally touch many different legal aspects, such as of civil and public construction law, neighbor law, environmental law, professional rules of engineers and sometimes criminal law as well. Of course, architects and construction managers are more involved in law related construction issues than a civil engineer is. However, also the civil engineers every day work live is influenced by diverse rules and regulations. A fundamental understanding of the home countries legal system, of legal relationships in construction projects as well as relevant law sources are necessary to avoid legal pitfalls that possibly can result in a financial or personal disadvantage.
正如土木工程师的工作要求一样,今天对建筑项目的法律要求也同样具有挑战性。然而,人们普遍认为土木工程是一个完全不需要法律知识和技能的职业。但建设项目通常涉及许多不同的法律方面,如民事和公共建筑法、邻接法、环境法、工程师的专业规则,有时也涉及刑法。当然,建筑师和施工经理比土木工程师更多地涉及与法律相关的建筑问题。然而,土木工程师的日常工作生活也受到各种规章制度的影响。对母国的法律制度、建设项目中的法律关系以及相关法律来源有一个基本的了解是必要的,以避免可能导致财务或个人不利的法律陷阱。
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引用次数: 0
Structural Fire Design-Statement on the Design of Cross-Laminated Timber (CLT) 结构防火设计-交叉层压木材(CLT)设计说明
Pub Date : 2019-03-22 DOI: 10.19080/CERJ.2019.07.555721
J. Schmid, N. Werther, Michael Klippel, A. Frangi
Recently, some comments about Cross-Laminated Timber (CLT) appeared in journals, online press and lobby documents that highlighted “inconsistencies” of the product when it comes to its fire safe use. The actual document summarizes relevant fire characteristics of CLT, which were brought up, and addresses them accordingly with respect to common understanding, established experience, European standardization and available design guidance. This document shows that currently fire design is not fully covered by codes, but safe design is possible using additional sources as guideline and state of the art documents. The authors of this document share the opinion with CEN/TC 250/SC5/WG4 that fire safe design of CLT is achieved when actual state of the art guidance is
最近,一些关于交叉层压木材(CLT)的评论出现在期刊、在线媒体和游说文件上,强调了该产品在防火安全使用方面的“不一致”。实际文件总结了所提出的CLT的相关防火特性,并根据共识、已建立的经验、欧洲标准化和现有设计指南对其进行了相应的处理。本文件表明,目前的消防设计并没有完全被规范所涵盖,但安全设计是可能的,使用额外的来源作为指导方针和最新的文件。本文作者与CEN/TC 250/SC5/WG4的观点一致,认为只有在实际的技术水平指导下,CLT的消防安全设计才能实现
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引用次数: 3
Industrial Development Conflicts in Modern Developmental State: Taiwan taken as an Example
Pub Date : 2019-03-15 DOI: 10.19080/CERJ.2019.07.555716
A. Cheng
The rapid growth of Taiwan’s economy was contributed to manufacturing and a specific economic development model, developmental state strategy, in the later 20th century. As a developmental state, the government has high state autonomy; its decision-making organizations are composed by professional technocrats; the policy decision put a priority on economic development to facilitate rapid industrialization with positive interventions. In addition, government will subsidize strategic industries and provide the preferential loans for enterprises to promote the development of the emerging industries [1]. Shi-jie [2] also generalized three main features of developmental state. First, government highly intervenes markets and establishes the dedicated agencies (such as Ministry of International Trade and Industry in Japan, National Development Council in Taiwan, Economic Development Board in Singapore, etc.) to formulate developing strategies to lead the economic development [3]. Second, government adopts flexible industrial policies to support the strategic industries with various subsidies and safeguards. Third, government implements land reform with clear social policies, maintains social and economic equality to prevent serious political conflicts. The features mentioned above could be found in Taiwan’s government as well, it was centralized and dominated industrial development to accumulate great wealth for Taiwan in a short time. In 1949, the Republic of China government withdrew to Taiwan, first invested in light industry to supply domestic demand market, and then turned to export after 1960. Since 1972, the gross production of heavy industry was finally equal to light industry; Taiwan transformed into an industrialized society afterward Shu-Yuan [4]. However, under the impacts of international political situation and economic environment in the early 1970s, Taiwan’s government implemented “Ten Major Construction Projects” to strengthen infrastructures in terms of transportation, heavy industry and energy development to improve economy.
20世纪后期,台湾经济的快速增长得益于制造业和一种特定的经济发展模式——发展型国家战略。作为一个发展型国家,政府具有高度的国家自治权;其决策机构由专业的技术官僚组成;该政策决定将经济发展放在首位,通过积极干预促进快速工业化。此外,政府将对战略性产业进行补贴,为企业提供优惠贷款,促进新兴产业的发展。石杰还概括了发育状态的三个主要特征。首先,政府高度干预市场,成立专门机构(如日本的国际贸易和工业部,台湾的国家发展委员会,新加坡的经济发展局等)制定发展战略,引领经济发展bb0。二是政府采取灵活的产业政策,通过各种补贴和保障措施支持战略性产业。第三,政府以明确的社会政策实施土地改革,维护社会经济平等,防止严重的政治冲突。上述特点在台湾政府中也有体现,中央集权,主导工业发展,为台湾在短时间内积累了巨大的财富。1949年,民国政府撤至台湾,先投资轻工业供应内需市场,1960年后转向出口。1972年以后,重工业总产值终于与轻工业持平;民国元年以后,台湾转型为工业化社会。然而,在70年代初国际政治形势和经济环境的影响下,台湾政府实施了“十大建设工程”,加强交通、重工业和能源开发等基础设施建设,以改善经济。
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引用次数: 0
Substantiation of the Way of Modernization of Shunting Diesel Locomotives 调车内燃机车现代化道路的论证
Pub Date : 2019-03-13 DOI: 10.19080/CERJ.2019.07.555714
O. Pasko
The analysis of the reconstruction process of traction means on the world railways shows that the railway polygon operated by diesel locomotive traction and the transport volume carried out by diesel locomotives on the railways occupy the leading place. Despite the fact that in the countries of Western Europe and the USA the process of introducing advanced types of traction has been completed or is almost completed, demand for diesel locomotives will remain stable worldwide. Moreover, these countries will require the replacement and modernization of outdated diesel locomotives. All this is driving the leading global diesel locomotive companies such as Brush Traction, Alstom, Toshiba, General Electric to work intensively on the creation of new diesel locomotive constructions. The global trend towards energy efficiency makes it necessary to move to more environmentally friendly and reliable shunting diesel locomotives. Given the fact that shunting diesel locomotives are often used as suburban railway locomotives in short, inactive sections, the issue of reducing fuel and energy consumption is currently an acute and priority task. They are also one of the most important elements of railway stations ensuring their uninterrupted operation, therefore the creation of hybrid units for shunting traction with advanced control systems is one of the actual scientific and technical tasks of the railway transport. The article addresses the problems of inefficient use of fuel and energy resources by shunting locomotives. The proposed functional scheme of the hybrid diesel locomotive makes it possible to introduce traction engine control systems to improve their properties..
对世界铁路牵引方式改造过程的分析表明,内燃机车牵引运行的铁路多边形和内燃机车在铁路上的运输量占主导地位。尽管在西欧和美国,引进先进牵引形式的过程已经完成或即将完成,但全世界对柴油机车的需求将保持稳定。此外,这些国家将需要更换和现代化过时的柴油机车。这一切都促使全球领先的柴油机车公司,如刷牵引,阿尔斯通,东芝,通用电气加紧工作,创造新的柴油机车结构。能源效率的全球趋势使得有必要转向更环保、更可靠的调车柴油机车。由于调车内燃机车经常作为城郊铁路机车在短而不活跃的路段使用,降低燃料和能源消耗的问题是当前一个紧迫和优先的任务。它们也是火车站确保其不间断运行的最重要因素之一,因此,创建具有先进控制系统的混合单元用于调车牵引是铁路运输的实际科学和技术任务之一。本文论述了调车机车燃料和能源利用效率低的问题。提出的混合动力内燃机车的功能方案为引入牵引发动机控制系统改善其性能提供了可能。
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引用次数: 2
The current state of nuclear electrical power in the United States 美国目前的核电状况
Pub Date : 2019-02-27 DOI: 10.31031/acet.2019.03.000553
G. Sandquist
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引用次数: 0
Empirical Study of Optimal Capital Structure and the Debt Capacity of BOT Projects BOT项目最优资本结构与债务能力实证研究
Pub Date : 2019-02-20 DOI: 10.19080/CERJ.2019.07.555713
Borliang Chen
It is world widely trend for governmental agencies to promote private sectors to participate in the development of infrastructures, such as BOT projects. However, BOT projects are inherently risky due to too many uncertainties during the project period. Overoptimistic in revenue and lack of risk analysis in BOT projects might usually lead the concessionaire to misestimate the project feasibility. This may result in high probability of defaults (PD) of BOT projects and cause financial disaster toward concessionaire. In the worst situation, it could make the projects become unbackable. However, it is rarely to discuss the probability of defaults and bankruptcy cost in the conventional BOT financial model. In general, capital structure of BOT projects is assumed 30% of equity and 70% of debt, and debt repayment is arranged in repaying equivalent uniform annul cost debt in repayment periods. This kind of repayment arrangement does not consider the erratic nature of revenue. It is risky to repay the debt obligation with inflexible repayment term. And, it may lead to high PD of the projects. The objective of this study was to alleviate the risk of project defaults due to the volatility of revenue. A student dormitory project of the national United University in Taiwan is used as an empirical study to demonstrate the analysis. The repayment arrangement proposed in this paper could make the 35% PD of the project reduce to less than 1% PD.
政府机构推动私营部门参与诸如BOT项目等基础设施的开发是世界的普遍趋势。然而,由于项目期间存在太多的不确定性,BOT项目本身就存在风险。在BOT项目中,对收益过于乐观和缺乏风险分析往往会导致特许权人对项目可行性的错误估计。这可能导致BOT项目的高违约概率,给特许经营者带来财务灾难。在最坏的情况下,它可能会使项目变得无法支持。然而,在传统的BOT融资模型中,很少讨论违约概率和破产成本。一般情况下,BOT项目的资本结构假设为股权占30%,债务占70%,债务偿还安排为在还款期偿还等值的统一年度成本债务。这种还款安排没有考虑到收入的不稳定性。偿还期限不灵活的债务是有风险的。并且,它可能导致项目的高PD。本研究的目的是为了减轻由于收入波动而导致的项目违约风险。以台湾国立联合大学学生宿舍项目为实证研究,对上述分析进行了验证。本文提出的还款安排可以使项目的35% PD降低到1%以下PD。
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引用次数: 0
Discussion on Seismic Performance of Non-seismically Designed Structures 非抗震设计结构抗震性能探讨
Pub Date : 2019-02-20 DOI: 10.19080/CERJ.2019.07.555712
H. Wong
This article briefly reviews the critical construction practices which were widely adopted for existing building structures in low to moderate seismic regions. The corresponding effect to seismic performance is discussed and it is concluded that further study is required to retrofit existing buildings which are without seismic considerations.
本文简要回顾了在低、中震区现有建筑结构中广泛采用的关键施工方法。讨论了相应的对抗震性能的影响,并得出结论,需要进一步研究对现有建筑进行改造,没有抗震考虑。
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引用次数: 0
Following Status and Percent Followers on Two-Lane Highways: Empirical Investigation 双车道高速公路跟随者状况与百分比:实证调查
Pub Date : 2019-02-15 DOI: 10.19080/CERJ.2019.07.555711
A. Al-Kaisy
This paper presents an empirical investigation into car following interactions. Detector data from 15 study sites in Idaho, Montana and Oregon representing all three highway classes were used in this investigation. Investigation of speeds and headways suggests that the headway at which vehicles start the car-following interaction (referred to in this study as the critical headway) varied in a range that is site-specific, with the lower limit generally varying between 1 and 2 seconds, and the upper limit varying between 6 and 7 seconds. The study also found that vehicles traveling at a perceived minimum safe headway increase in number as headways get smaller and more vehicles enter the car following state. Further, the study introduced a new approach for estimating percent followers in the traffic stream and used field data in deriving headway cut-off values. Headway cut-off value for percent followers at class I sites varied between 1.8 and 2.8 seconds, while those for class II and class III sites are slightly above 3 seconds. This paper presents an empirical investigation into the car-following interaction and the estimation of percent followers on rural two-lane highways. Field data from 15 study sites in Idaho, Montana and Oregon were used in this investigation. The most important findings of this study are summarized as follows:
本文对汽车跟随互动进行了实证研究。探测器数据来自爱达荷州,蒙大拿州和俄勒冈州的15个研究地点,代表了这三种公路类型。对车速和车头距的调查表明,车辆开始车跟互动时的车头时距(本研究中称为临界车头时距)在特定地点的范围内变化,下限通常在1到2秒之间变化,上限在6到7秒之间变化。研究还发现,随着车头距变小,越来越多的车辆进入尾随状态,以最小安全车头距行驶的车辆数量也在增加。此外,该研究引入了一种新的方法来估计交通流中的追随者百分比,并使用现场数据来获得车头时距截止值。第一类站点的百分比追随者的进展截止值在1.8到2.8秒之间,而第二类和第三类站点的进展截止值略高于3秒。本文对农村双车道高速公路上的车辆跟随互动及随从百分比估算进行了实证研究。本次调查使用了爱达荷州、蒙大拿州和俄勒冈州15个研究地点的现场数据。本研究最重要的发现总结如下:
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引用次数: 1
Preference Index of the Acoustic Quality Assessment of Sacral Sound Field 骶骨声场音质评价的偏好指数
Pub Date : 2019-02-12 DOI: 10.19080/cerj.2019.07.555710
Chiung-Yao Chen
The characteristics of sacral sound perception were surveyed by using two different measurements in four churches of the Ando [1] suggested that sound quality has four decisive parameters: A. initial Listening levels and inter-aural correlation The classical music Motif A, B and a chorus of poem were employed to evaluate the sound perception in the liturgy hall of churches by using Ando’s model. Furthermore, the questionnaire was implemented by using a five-point Likert scale of a thirteen audible perception dialogue. The results of the global index of these two measures are quite agreement. But the variation occurred at high reverberation of the lower frequency band with respective to the sense of hearing in such band which is a crucial element in sacral sound perception.
在安藤的四个教堂中,通过两种不同的测量方法调查了骶骨的声音感知特征[1],表明声音质量有四个决定性参数:A.初始聆听水平和耳间相关性。古典音乐Motif A, B和诗歌合唱采用Ando的模型来评估教堂礼拜大厅的声音感知。此外,问卷是通过使用李克特五分量表的13听觉感知对话来实施的。这两种措施的全球指数的结果是相当一致的。但在低频高混响时,这种变化发生在该频段的听觉上,而听觉是骶骨声音感知的关键因素。
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引用次数: 0
期刊
Constructii Journal of Civil Engineering Research
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