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The Shapes of Large Urban Areas in the U.S., 1950-2010: Patterns, Causes, and Consequences 1950-2010年美国大城市区域的形态:模式、原因和后果
Pub Date : 2021-03-01 DOI: 10.2139/ssrn.3799728
J. Ottensmann
The compactness of the shapes of 59 large urban areas in the United States from 1950 to 2010 is measured using an index of proximity based on the mean distance from the Central Business District to all areas within the urban area. Average changes in the proximity index over time are small, but individual urban areas have experienced much larger changes in shape, becoming both more and less compact. Larger urban areas tend to be somewhat less compact. Barriers to the expansion of urban areas including water, wetlands, mountains, and protected lands are associated with lower levels of proximity and compactness. Lower proximity is associated with higher urban area densities and smaller declines in densities with distance from the Central Business District.
从1950年到2010年,美国59个大型城市区域的形状紧凑度是用一个接近指数来衡量的,该指数基于从中央商务区到城市区域内所有区域的平均距离。随着时间的推移,邻近指数的平均变化很小,但个别城市地区在形状上经历了更大的变化,变得更紧凑或更不紧凑。较大的城市地区往往不那么紧凑。城市区域扩张的障碍包括水域、湿地、山脉和保护区,这些障碍与较低水平的接近性和紧凑性有关。距离越近,市区密度越高,距离中央商务区越远,密度下降越小。
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引用次数: 0
Application of Shape Memory Alloy 形状记忆合金的应用
Pub Date : 2020-05-30 DOI: 10.2139/ssrn.3614161
Eva Clithy
Shape memory alloy (SMA) is a special metal material with unique properties, that is, this material can restore to its original shape through pressure or temperature changes after deformation. The successful development of Ti-Ni SMA in the 1960s, with the continuous deepening of SMA theory and application research, SMAs gradually entered the practical stage. At present, SMAs have been widely used in aerospace, biomedicine, mechanical electronics and other fields. This article briefly reviews the application of SMAs and makes perspective comments on the current problems of SMA research.
形状记忆合金(SMA)是一种特殊的金属材料,具有独特的性能,即这种材料在变形后可以通过压力或温度的变化恢复到原来的形状。20世纪60年代Ti-Ni SMA研制成功,随着SMA理论和应用研究的不断深入,SMA逐渐进入实用阶段。目前,sma已广泛应用于航空航天、生物医药、机械电子等领域。本文简要回顾了SMA的应用,并对SMA研究中存在的问题进行了展望。
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引用次数: 2
Renewable Power Trades and Network Congestion Externalities 可再生能源交易与网络拥塞外部性
Pub Date : 2020-05-28 DOI: 10.2139/ssrn.3613293
Nayara Aguiar, Indraneel Chakraborty, V. Gupta
As power generation by renewable sources increases, power transmission patterns over the electric grid change. We show that due to physical laws, these new transmission patterns lead to non-intuitive grid congestion externalities. We derive the conditions under which network externalities due to power trades occur. Calibration shows that each additional unit of power traded between northern and western Europe reduces transmission capacity for the southern and eastern regions by 27% per unit traded. Given such externalities, new investments in the electric grid infrastructure cannot be made piecemeal. Power transit fares can help finance investment in regions facing network congestion externalities.
随着可再生能源发电量的增加,电网上的输电模式发生了变化。我们表明,由于物理定律,这些新的传输模式导致非直观的电网拥堵外部性。我们推导了电力交易引起的网络外部性发生的条件。校准表明,北欧和西欧之间每增加一单位电力交易,南欧和东欧地区的输电能力就会减少27%。考虑到这些外部性,对电网基础设施的新投资不能零敲碎打。电力运输费用可以帮助面临网络拥堵外部性的地区融资投资。
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引用次数: 0
Review on Sustainability Management Using Zero Waste Concept for Building Construction “零废物”概念在建筑施工中的可持续管理研究综述
Pub Date : 2020-05-01 DOI: 10.21276/ijircst.2020.8.3.30
Sakshi Gupta, Rishabh N. Mahure, Ankita Batra
All over the world, construction and demolition (C&D) waste is generated in enormous amount which leads to various environmental problems. The waste is dumped illegally or into the landfills which degrades the soil and causes pollution. To eliminate the problem of C&D waste management, the concept of zero waste for building construction has been studied in this work. This study aims at finding out the possible research gaps in the management of construction and demolition waste and extant literature survey was done on the sustainability management using zero waste concept.
在世界范围内,建筑和拆除(C&D)产生了大量的垃圾,导致了各种环境问题。废物被非法倾倒或填埋,这使土壤退化并造成污染。为了消除建筑垃圾管理的问题,本工作研究了建筑施工零废物的概念。本研究旨在找出建筑和拆除废物管理方面可能存在的研究空白,并对现有文献进行了零废物概念的可持续管理调查。
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引用次数: 0
Milling Parameter Selection to Lower Specific Cutting Energy During Machining of Alloy Steels 选择铣削参数以降低合金钢加工过程中的切削比能量
Pub Date : 2020-03-04 DOI: 10.2139/ssrn.3548412
Sudeep Kumar Singh, Adarsha Arijit Sahoo, Biswojit Pattnayak, Biswo Bhushan Tarai, A.M. Mohanty
Sustainability has become a buzz word worldwide due to increasing concern towards environmental pollution. Milling is a widely adopted energy-intensive process in industry. Reduction in energy consumption in machining can greatly relieve load on the environment. This paper presents a methodology for enhancing energy efficiency by reducing specific cutting energy and maintaining surface finish, a major quality parameter. The current study focuses on the selection of optimum milling parameters set in Vertical Milling Machine for machining Stainless Steel and Bright Steel, considering Surface Finish and Specific Cutting Energy as output parameters during the process. The conducted experiments have been designed using TAGUCHI orthogonal array using Minitab 18 software. The cutting speed, feed, depth of cut, cutter diameter and work material are considered as potential input parameters affecting the output parameters of the milling process. Power consumption has been measured using a power analyzer. The regression model has been implemented using Artificial Neural Network on Matlab R2017b. The input and output variables have been correlated using ANN to select the best possible combination of milling input parameters.
由于人们越来越关注环境污染问题,可持续发展已成为全球的热门词汇。铣削加工是工业中广泛采用的能源密集型工艺。减少加工过程中的能耗可以大大减轻对环境的负荷。本文介绍了一种通过降低特定切削能量来提高能效的方法,同时还能保持表面光洁度这一主要质量参数。当前研究的重点是选择立式铣床的最佳铣削参数集,以加工不锈钢和光亮钢,同时考虑表面光洁度和特定切削能量作为加工过程中的输出参数。实验采用 TAGUCHI 正交阵列设计,使用 Minitab 18 软件。切削速度、进给量、切削深度、刀具直径和工件材料被视为影响铣削过程输出参数的潜在输入参数。功率消耗使用功率分析仪进行测量。回归模型使用 Matlab R2017b 上的人工神经网络实现。输入和输出变量通过人工神经网络进行关联,以选择最佳的铣削输入参数组合。
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引用次数: 0
Compressibility Behaviour of Compacted Soils – Hyperbolic Modelling 压实土的压缩特性。双曲模型
Pub Date : 2020-02-07 DOI: 10.31224/osf.io/a5fty
U. Ratnam, Nagendra Prasad K
Compacted soils constitute most engineering projects such as earth dams,embankments, pavements, and engineered slopes because of their high shear strengthand low compressibility. The compressibility behavior of compacted soils is a key soilparameter in the design of earth structures but it is not determined correctly owing topartly saturated state. The compressibility of compacted soils can be better evaluatedunder the framework of hyperbolic behavior. One dimensional Consolidation tests oncompacted specimens were conducted using conventional oedometer apparatus underconstant water content condition. Tests were conducted by compact the soil specimensat respective optimum moisture contents for eight different soil samples, of varyinggrain size characteristics and consistency limits, collected from Tirupati Region. Themain objective of this study is to examine the compressibility behavior of compactedsoils to propose a phenomenological model. It is observed that the compressibilitybehavior can be captured by hyperbolic modeling with model parameters involved inthe behavior being initial void ratio, e0, representing the initial state of soil and otherhyperbolic constants linked to this state. The data of 6 samples were used fordeveloping the model and the data of remaining two samples were used for predictingthe observed response from the model proposed. The data of published literature hasalso been used to predict the experimental behavior to bring out the merits of themodel proposed.
由于其高抗剪强度和低压缩性,压实土构成了大多数工程项目,如土坝、堤防、路面和工程边坡。压实土的压缩特性是土工结构设计中的一个关键参数,但由于部分饱和状态,压实土的压缩特性不能准确确定。在双曲特性的框架下,可以更好地评价压实土的压缩性。在恒定含水量条件下,用常规测湿仪对压实试样进行一维固结试验。对采自蒂鲁帕蒂地区的8种不同粒度特征和稠度极限的土样进行了各自最佳含水率的土样压实试验。本研究的主要目的是研究压实土的压缩性行为,并提出一个现象学模型。可以观察到,可压缩性行为可以通过双曲模型来捕获,其中涉及的模型参数是初始空隙比e0,代表土壤的初始状态,以及与此状态相关的其他双曲常数。6个样本的数据用于开发模型,其余2个样本的数据用于预测模型的观测响应。并利用已发表的文献数据对实验行为进行了预测,以证明所提出模型的优点。
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引用次数: 0
Addressing Forest Governance and Sustainable Forest Management in Preferential Trade Agreements 在优惠贸易协定中解决森林治理和可持续森林管理问题
Pub Date : 2020-01-15 DOI: 10.2139/ssrn.3525334
Y. Pacheco
The inclusion of environmental clauses in Preferential Trade Agreements (PTAs) enables to incorporate specific rules on forest governance and Sustainable Forest Management (SFM) and to promote the implementation of forests-related Multilateral Environmental Agreements (MEAs). This tendency might be interpreted as a potential way to improve the protection of forests since it would contribute to strengthening the international forest regime, particularly through the definition of new commitments linked to bilateral cooperation, and the possibility of applying trade sanctions for non-compliance. Some recent requests to the Peruvian Government in the frame of the US – Peru PTA indicate that further developments might be expected in terms of sustainable development and environmental protection. Since the European Union and the United States are the parties with the highest number of these types of rules in PTAs, this paper analyses how they have addressed Sustainable Forest Management and forest governance issues in their PTAs.
在优惠贸易协定中列入环境条款能够纳入关于森林治理和可持续森林管理的具体规则,并促进与森林有关的多边环境协定的执行。这种趋势可能被解释为改善森林保护的一种潜在方式,因为它将有助于加强国际森林制度,特别是通过确定与双边合作有关的新承诺,以及对不遵守的行为实施贸易制裁的可能性。最近在美国-秘鲁优惠贸易区框架内向秘鲁政府提出的一些要求表明,在可持续发展和环境保护方面可能会有进一步的发展。由于欧盟和美国是pta中此类规则数量最多的缔约方,本文分析了它们如何在其pta中解决可持续森林管理和森林治理问题。
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引用次数: 0
Deciphering Smart City Citizenship: The Techno-Politics of Data and Urban Co-Operative Platforms 解读智慧城市公民身份:数据和城市合作平台的技术政治
Pub Date : 2019-12-23 DOI: 10.31235/osf.io/ucbja
Igor Calzada
The hegemonic ‘smart city’ approach in the European H2020 institutional framework is slowly evolving into a new citizen-centric paradigm called the ‘experimental city’. While this evolution incorporates social innovations—including urban co-operative platforms that are flourishing as (smart) citizens are increasingly considered decision-makers rather than data providers—certain underlying ethical and democratic issues concerning the techno-politics of data remain unresolved. To cite this article: Calzada, I. (2018), Deciphering Smart City Citizenship: The Techno-Politics of Data and Urban Co-operative Platforms. RIEV, Revista Internacional de Estudios Vascos/International Journal on Basque Studies 63(1-2):42-81. DOI: 10.13140/RG.2.2.24498.35524/6.
欧洲H2020制度框架中的霸权“智慧城市”方法正在慢慢演变为一种新的以公民为中心的范式,称为“实验城市”。虽然这种演变融合了社会创新——包括城市合作平台的蓬勃发展,因为(聪明的)公民越来越被视为决策者,而不是数据提供者——但有关数据技术政治的某些潜在伦理和民主问题仍未得到解决。引用本文:Calzada, I.(2018),解读智慧城市公民身份:数据和城市合作平台的技术政治。RIEV, revsta International de Estudios Vascos/国际巴斯克研究杂志63(1-2):42-81。DOI: 10.13140 / RG.2.2.24498.35524/6。
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引用次数: 13
Evolution of High-Speed Rail and its Development Effects: Stylized Facts and Review of Relationships 高速铁路的演变及其发展效应:程式化的事实与关系回顾
Pub Date : 2019-11-14 DOI: 10.2139/ssrn.3554834
Shreyas Bharule, T. Kidokoro, F. Seta
The potential effects of high-speed rail (HSR) reach into many overlapping fields of interest. This paper summarizes the evolution of HSR and elaborates on the development effects of the HSR transport infrastructure. HSR can simultaneously become a core component of desired urban developments, while also having undesirable outcomes. Positive impacts will be achieved only if interactions with other factors and contexts are maintained. This paper stratifies and expands the understanding of the development effects of HSR at three levels-regional, urban, and station area-based on the economic and temporal nature of all infrastructure projects. There is ample evidence that at the regional level, the implementation of an HSR service disrupts the existing network of cities along the proposed corridor. The HSR network changes the accessibility of a locality. Better accessibility will change the mobility patterns and will eventually affect the development in the impacted region, reshaping the entire urban-regional system. The HSR is expected to play a catalyzing role in driving the spatial and urban transformation process. This paper emphasizes the importance of establishing a synergy between HSR and urban development. A synergy between HSR and other elements, like urban transit facilities, paratransit, station area development, node, and sub-center development, can usher in spatial and economic development, but an institutional arrangement across all the elements is of paramount importance. Such a synergy would enhance livability and provide improved quality of life opportunities in cities and regions served by HSR. Last, an HSR corridor is beneficial both to the settlements along the corridor and to the railway operator. An HSR corridor is also beneficial to the cities along the railways, and the station areas provide an important opportunity to harness revenue through non-railway businesses. However, achieving the full development effects of an HSR project may take decades. Careful pre-planning of the project and coordination amongst the stakeholders are necessary to accomplish a set of phased goals to realize the envisioned development of an HSR corridor.
高速铁路(HSR)的潜在影响涉及许多相互重叠的领域。本文总结了高铁的发展历程,阐述了高铁交通基础设施的发展效应。高铁可以同时成为理想城市发展的核心组成部分,同时也会产生不良后果。只有保持与其他因素和环境的相互作用,才能产生积极的影响。本文基于所有基础设施项目的经济和时间性质,从区域、城市和站区三个层面对高铁的发展效应进行了分层和扩展。有充分的证据表明,在区域层面上,高铁服务的实施会破坏拟议走廊沿线现有的城市网络。高铁网络改变了一个地方的可达性。可达性的改善将改变交通模式,最终影响受影响区域的发展,重塑整个城市-区域系统。高铁有望在推动空间和城市转型过程中发挥催化作用。本文强调在高铁与城市发展之间建立协同效应的重要性。高铁与城市交通设施、副交通、站区发展、节点和副中心发展等要素之间的协同作用,可以带来空间和经济的发展,但最重要的是所有要素之间的制度安排。这种协同作用将提高高铁服务的城市和地区的宜居性,并改善生活质量。最后,高铁走廊对走廊沿线的居民和铁路运营商都有利。高铁走廊也有利于铁路沿线的城市,车站地区提供了一个重要的机会,可以通过非铁路业务来利用收入。然而,实现高铁项目的全部发展效果可能需要几十年的时间。为了实现高铁走廊的预期发展,需要对项目进行仔细的预先规划,并在利益相关者之间进行协调。
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引用次数: 4
Land Entitlement and People's Movement in Odisha- A Case Study of Balarampur Village 奥里萨邦的土地权利与人口流动——以Balarampur村为例
Pub Date : 2019-10-14 DOI: 10.2139/ssrn.3600669
Jyotsnamayee Nanda
During the post- independence era the mineral rich State Odisha has focused on its economic development through providing water for irrigation, harnessing mineral resources, establishment of different industries etc. But for the purpose land acquisition is a primary requisite which is resulted in large-scale dispossession of land, homesteads, forests and also alleged that the developmental flow is pooled with denial of livelihood and human rights. Thus protests against the land acquisition started for different projects from different corners of Odisha which underlies with the people’s perception and emotional attachment to those lands. The protests were not only for their land but also for their livelihood and traditional way of living which they fear to be under threat. The major concern of the poor people in land acquisition process is that the land which they enjoyed for generations as a hereditary asset will go permanently out of their hands. In this context Odisha has a long history of people’s movements but movement of inhabitants of Balarampur village under Dhenkanal District is unique and acknowledged as an accomplishment of people’s struggle. Thus current paper throws light on the resistance and repression in Balarampur village against Industrial Project for the unrecorded title of people over the long years of nurture of forest. This enlightens how the land acquisition is to be looked by both Government and project proponent from People’s perspective to bring a support from people than oppose the Growth. In addition, it should also be made to understand how the economic benefit out of the Industrial growth should encourage people to realize the benefit to them will be more than from their traditional livelihood.
在独立后的时代,矿产丰富的奥里萨邦通过提供灌溉用水、利用矿产资源、建立不同的工业等方式专注于其经济发展。但是,为了达到这一目的,征地是首要条件,这导致大规模剥夺土地、宅基地和森林,而且还指称发展的过程与剥夺生计和人权的情况混在一起。因此,反对征地的抗议活动开始于奥里萨邦不同角落的不同项目,这与人们对这些土地的感知和情感依恋有关。抗议不仅是为了他们的土地,也是为了他们的生计和他们担心受到威胁的传统生活方式。穷人在征地过程中最关心的问题是,他们世代享有的作为世袭财产的土地将永远离开他们的手中。在这种背景下,奥里萨邦有着悠久的人民运动历史,但Dhenkanal区Balarampur村居民的运动是独一无二的,被认为是人民斗争的成就。因此,当前的论文揭示了Balarampur村对工业项目的抵制和镇压,因为人们在长期培育森林的过程中没有记录到他们的头衔。这启发了政府和项目倡议者如何从人民的角度看待征地,以获得人民的支持而不是反对增长。此外,还应该了解工业增长的经济效益如何鼓励人们认识到,工业增长给他们带来的好处将超过他们传统的生活方式。
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引用次数: 0
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Built Environment eJournal
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