Reduction Factors for Seismic Design Spectra for Structures with Viscous Energy Dampers

A simple mathematical expression is proposed to estimate spectra reduction damping factors for seismic design of systems with viscous dampers. The expression is obtained from the ratios between ordinates of uniform hazard spectra associated with two different return intervals (50 and 125 years), corresponding to sites with different types of soil within the Valley of Mexico. The expression proposed depends on the dominant period of the soil, and on both the vibration period and damping ratio of the structural system. Values of the damping factors proposed here are comparable to those recommended by different authors and seismic design building codes.     

Pushover Analyses of Hand-Loaded Steel Storage Shelving Racks

Among the various types of industrial solutions used to store goods and products, the light duty hand loaded shelving rack (SR) typology represents a very popular solution for domestic applications, libraries and for superstores/markets open to the public. Despite the limited cost, an eventual collapse could result in significant damage of stored goods, injuries, and potentially the loss of human life, with the possible consequence of a long suspension of commercial activities. This reflects directly on the great importance of a correct design that, despite the large use of SRs, is nowadays developed with approaches characterized by inadequate levels of reliability.

A research program on SRs is currently in progress in Italy, with the aim of improving the rules for both static and seismic design and this article presents a combined experimental-numerical study. Both component and pushover tests have been carried out, that are shortly summarized. Overall frame response has been simulated by means of advanced finite element software able to capture key features of the nonlinear response of slender frames with mono-symmetric cross-section members.     

The Journey of Infertility from Private Sphere to Public Domain: From Cosmetic Surgery to Disability

This study explores the process by which the treatment of infertility, which has been in the hands of the private sector, has been taken over by the state as a matter of public health. It argues that this shift stems from the pro-natalist policies of the state to help increase the population. Infertility treatment, using assisted reproductive technologies and its legitimization by the Islamic jurists, is used as a lens through which to examine the state's body politic. The frequent reversals of policies, since the late nineteenth century to the present, are shown to be directly linked with the nation-building goals of the state, expecting the citizens to readjust their reproductive behavior to meet the state’s policies.     

乾隆时期中俄外交争议中的土尔扈特部问题

本对乾隆时期土尔扈特部东归的原因、清朝对土尔扈特部的政策以及清朝和俄罗斯因土尔扈特部东归而产生的交涉等进行了探讨。认为土尔扈特部族东归乃是基于现实状况的考虑,为了该族生存的空间而做出的决定。     

The Unity of Gen 2,4

ABSTRACT

This article seeks to argue that Gen 2,4 should not be divided into two halfverses as many theologians have asserted. At least four good reasons exist for saying that the verse is best to be understood as one coherent whole. The article basically draws its reasoning from its close exegesis of Gen 2,4. However, the first reason is founded in looking into both the three verses before Gen 2,4 and into other Mesopotamian texts. The second and third argument are built upon an exegesis of Gen 2,4, and the ultimate reason is based upon the Masoretes” work in the Middle Ages, and is therefore an argument resting upon how an earlier traditions looked at the discussed verses.     

Quantification of Linked Column Frame Seismic Performance Factors for Use in Seismic Design

Previous research has proposed the Linked Column Frame (LCF) as a lateral load-resisting system capable of providing rapid return to occupancy for buildings impacted by moderate earthquake events and collapse prevention in very large events. The LCF consists of flexible moment frames (MF) and linked columns (LC), which are closely spaced dual columns interconnected with bolted links. The linked columns (LC) are designed to limit seismic forces and provide energy dissipation through yielding of the links, while preventing damage to the moment frame under certain earthquake hazard levels. The proposed design procedure ensures the links of the linked column yield at a significantly lower story drift than the beams of the moment frame, enabling design of this system for two distinct performance states: rapid repair, where only link damage occurs and quick link replacement is possible; and collapse prevention, where both the linked column and moment frame may be damaged.

Here, the seismic performance factors for the LCF system, including the response modification factor, R, the system over-strength factor, Ω₀, and the deflection amplification factor, C_d, are established following the procedures described in FEMA P695 [2009]. These parameters are necessary for inclusion of the system in the building code. This work describes the development of archetype structures, numerical models of the LCF systems, incremental dynamic analyses, and interpretation of the results. From the results, it is recommended that R, Ω₀, and C_d values of 8, 3, and 5.5 be used for seismic design of the LCF system. A height limit of 35 m (115ft) is recommended at this time as taller LCFs are not considered in this study.     

土尔扈特蒙古西迁后的经济状况及其对东归的影响

土尔扈特蒙古西迁至伏尔加河流域后,其经济状况可以概括为:传统游牧经济由盛而衰;以互通有无为基础的对俄贸易往来不断;为俄国军事战役出兵助战获得战利品和报酬成为特殊的收入来源;突袭其他民族和控制贸易路线是增加财富的渠道之一;捕鱼成为相当一部分生活贫困的土尔扈特人赖以维持生计的重要方式。作者认为经济状况恶化是促使土尔扈特蒙古东归的原因之一。     

Humanitarianism as conflicted care: Managing migrant assistance in EU Assisted Voluntary Return policies

Assisted Voluntary Return (AVR) programs occupy a central role in Europe's “management” of migration today. These state-funded programs allow migrants to meet with humanitarian counselors about the decision to return voluntarily, offering reintegration assistance and one-way travel booking to migrants' country of origin. This paper draws on interviews with practitioners at humanitarian organizations, those who counsel undocumented migrants and appeals rights exhausted asylum seekers about their decision to leave Europe via AVR, to consider the limits and potentials of humanitarian assistance for migrants in the EU's security-focused context. We query the degree to which care, as much as it is incorporated into regimes of bordering, can potentially disrupt hegemonic politics of assistance-as-governance. AVR provides a lens onto the politics of care and humanitarian assistance in migration management today, as migrants and practitioners negotiate together the decision to stay (with a limited range of legal options) or return via this increasingly relied upon policy.     

Return migration in China: a case study of Zhumadian in Henan province

This paper examines the causes and process of return migration from the coastal region to the inland provinces in China since the early 2010s, based on the case study of Zhumadian city in Henan Province. Surveys administered to both rural migrants from Zhumadian to Shenzhen and recent returnees to Zhumadian are presented. Industrial relocation and the development of inland provinces trigger the current wave of return migration. Family obligations, better prospects of the hometown, and barriers to settle in Shenzhen because of the hukou system are the principal reasons to return. Most of the migrants return to work in a factory or start a business. Some migrants purchase apartments in Zhumadian as a prelude to returning and starting a business at a future date. Returnees prefer settling down in urban areas rather than in their rural origins. In light of the empirical findings, the authors argue that return migration will ease the mismatch of labor supply and demand between the inland and coastal provinces, such that the Lewis Turning Point has not been reached yet. The continuing process of rural migrants returning to and settling down in Zhumadian suggests a way to achieve some of the goals in China’s new-type urbanization plan, as local governments may address the two major challenges of the plan, namely, local job creation and financing for increased demand for public services.