Controlled Rocking CLT Walls for Buildings in Regions of Moderate Seismicity: Design Procedure and Numerical Collapse Assessment

Controlled rocking heavy timber walls are designed to rock on their foundations in response to earthquakes. For regions of moderate seismicity, it is proposed that this rocking behaviour can be adequately controlled using only post-tensioning, even with a large force-reduction factor and no supplemental energy dissipation. This article presents a force-based design procedure for controlled rocking cross-laminated timber walls without supplemental energy dissipation, including a method for estimating higher mode effects. Fragility analyses of three prototype walls demonstrate that the procedure can limit the probability of collapse to <10% during a maximum considered earthquake in a region of moderate seismicity.     

Ayatollah Khomeini: From Islamic Government to Sovereign State

This paper argues that the mature form of the political doctrine of the Ayatollah Khomeini (1902–89), Iranian Shiite religious authority and architect of the Islamic Republic of Iran, grew out of an encounter with the modern understanding of the state and the concept of sovereignty. Khomeini’s political doctrine, called the Absolute Guardianship of the Islamic Jurist, although based on a religious foundation, should be studied as a break with the traditional understanding of political power in Shiism. It will be argued that such a political doctrine can play the same role as the Christian rhetoric of the early modern political thinkers played, pave the way for modernization of Shiite political thought, and prepare the ground for a modern temporal conception of politics.     

"天高皇帝近":一个重要的中国思想史命题——雷戈《秦汉之际的政治思想与皇权主义》评介

雷戈所著《秦汉之际的政治思想与皇权主义》一书,认为从秦朝到汉初的思想史发展阶段是中国思想史上皇权主义意识形态的生成和确立时期,并将其概括为"后战国时代";采用独特的"历史-思想"研究法,从政治制度、官场规则和官吏的政治生活中,挖掘特定时期的政治思想共识,为政治思想史研究开辟了新的路径,并扩大了思想史的资料范围;认为秦汉时期生成的皇权主义秩序,把"天高皇帝远"的制度现实变为"天高皇帝近"的观念实存,实现了对人们思想的可控性,从此,思想成为皇权可以控制和规范的领域,达到了有效的思想专制。这是秦汉以降中国思想史发展的基本特征。该书在研究方法的创新和思想深度的开掘上,都做出了独到的贡献。     

Teaching terrorism,saving the state? Education and geopolitical imaginations of terrorism in 12 violently challenged states

The role of education in political socialisation and the importance of terrorism discourses in promoting (or silencing) certain interests have long been acknowledged. This study combines both themes by asking: How do school textbooks, sanctioned by states that are violently challenged by internal opposition, discuss the issue of terrorism? I draw on, and contribute to, four distinct, yet related streams of research: critical geopolitics, critical terrorism studies, geographies of education, and young people's geographies. Simultaneously, while most work on the topic focuses on individual cases (typically of Western countries), I conduct the first comparative analysis of twelve countries from different world regions: China, Egypt, India, Kenya, Nigeria, Papua New Guinea, Peru, Philippines, Russia, Spain, Sri Lanka and Turkey. Contrary to recent claims, considerable heterogeneity persists regarding geopolitical imaginations of terrorism, while US-coined discourses are only infrequently adapted. However, there is still recognisable functionalist convergence as the states under analysis utilise their control of the education system in their internal struggles, mainly by portraying their opponents as evil, by ascribing a positive identity to themselves, and by calling for support by their citizens (including restrictions of human rights and democracy).     

Resources,regulation and the state: Struggles over gas extraction and passive revolution in Evo Morales's Bolivia

The indigenous-influenced policies of Evo Morales's Bolivia represent arguably the most important attempt to improve the socioenvironmental implications of resource extraction in recent years, reasserting the role of the state and social movements against ‘corporate-led governance’. In this paper, through combining the regulation approach with neo-Gramscian state theory, I carry out a conceptually informed analysis of struggles over hydrocarbon governance in Bolivia, in order to shed light on the reasons why such an ambitious political project has largely failed to realise its transformative potential. I make two interrelated arguments. First, initial, important advances in the governance of resources in Bolivia were later partially reversed, due to shifting power relations between social movements, the hydrocarbon industry, and the state. This points to the need of understanding resource governance and its changes as reflecting or ‘condensing’ shifting power relationships among social forces. Second, the coming to power of Evo Morales resulted in a ‘passive-revolutionary’ process whereby an initial radical break with the neoliberal order was followed by a gradual adaptation to pre-existing political economic relations and arrangements. Most notably, plans to reduce the country's dependency on gas exports as well as to challenge the transnational domination of the hydrocarbon sector were abandoned, generating an increasingly explicit incompatibility with indigenous demands. I conclude that neo-Gramscian theory offers important insights that enable us to advance our conceptualisation of the state in resource governance research and in political ecology more generally.     

Fording differences? Conditions mitigating water insecurity in the Niger River Basin

River basins are an extremely important source of freshwater for Africa and the impact of climate change on these communities constitutes an important question worth studying. Among these basins, the Niger River Basin is an ideal candidate for meso-level theory testing of climate change-induced political violence because of its importance as one of the largest sources of freshwater in Africa, its high vulnerability to climate change, and its location in a politically unstable region. This paper utilizes the benefits of GIS to test whether effects of water insecurity on the various incidences of political violence are conditional on economic, geographic, and social means of connectivity. Our analysis uses the density of secondary road networks, the geographic distance to the Niger River, and a shared co-ethnicity with one's head-of-state to evaluate the impact of hydrological stress and its subsequent risk for political violence across nine West African countries from 1997 to 2012. Using climatological data and an econometric de-trending method, we measure the separate, substantive impact that individualized changes in precipitation trend and precipitation variability have for the incidence of ACLED's political violence events, conditional on local economic, geographic, and social factors. Our results reveal a complicated web of circumstances under which certain forms of political violence are more/less likely to be observed. The implications of this analysis serve as a call for a closer inspection of the micro-channels by which climate stress impacts heterogeneous communities in the developing world.     

Lithic Production and Consumption Patterns from the Great Platform at Late Postclassic (A.D. 1350–1525) Tzintzuntzan,Mexico

Late Postclassic period (a.d. 1350–1525) Tarascan economic activities often included higher degrees of political involvement and territorial control compared with other ancient Mesoamerican societies. Here I examine Tarascan obsidian economies through an analysis of lithic production and consumption patterns from structures excavated on and near the Great Platform at the imperial capital of Tzintzuntzan. Four spatially distinct patterns are evident. Great Platform residents used high-quality obsidian blades as ceremonial items or burial offerings and scrapers for craft production. Lower elite residents of Structure F, outside the Great Platform, produced their own blade tools and consumed a higher percentage of green obsidian than residents of the Great Platform. Excavations at Yacata 3 recovered bifacial arrowheads and obsidian bloodletters associated with disturbed offerings. The spatial distributions of lapidary preforms and highly polished fragments combined with accounts from the Relación de Michoacán (a.d. 1541) suggest that lower elites produced obsidian jewelry near the Great Platform.     

Capacity Design of Coupled RC Walls

Capacity design aims to ensure controlled ductile response of structures when subjected to earthquakes. This article investigates the performance of existing capacity design equations for reinforced concrete coupled walls and then proposes a new simplified capacity design method based on state-of-the-art knowledge. The new method is verified through a case study in which a set of 15 coupled walls are subject to nonlinear time-history analyses. The article includes examination of the maximum shear force in individual walls in relation to the total maximum shear force in the coupled wall system, and subsequently provides recommendations for design.     

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.     

GIS技术在萨拉乌苏考古遗址公园规划设计中的应用

传统规划设计工作的技术平台多以计算机辅助设计(CAD)为主,本工作以内蒙古自治区鄂尔多斯萨拉乌苏考古遗址公园规划为例,将Arc GIS Desktop作为技术平台应用到公园的规划设计工作中。首先,通过对规划区的实地踏勘,采集相关数据和资料,进行规划区数据库建设;其次,在数据库建设的基础上,通过GIS技术构建与现实环境对应的虚拟地理信息空间,实现规划区景观的三维可视化;最后,利用三维景观模型对现实地理环境进行模拟、分析及虚拟场景飞行。不同于传统CAD的二维工作平台,本工作借助GIS对空间数据和属性数据的强大处理功能及其三维景观可视化模块,为实现内蒙古鄂尔多斯萨拉乌苏考古遗址公园的科学规划提供辅助。