Effect of hysteretic smoothness on inelastic response spectra with constant‐ductility

This paper presents an efficient methodology for computing constant‐ductility inelastic response spectra. The computation of constant‐ductility spectra involves numerical root‐finding algorithms to find the strongest structure providing a desired ductility response. Smooth inelastic structural behavior is modeled using a first‐order nonlinear differential equation and the transient structural response is solved using an implicit algorithm requiring Newton iterations at each time step. For structural models with smooth hysteretic behavior (not piece‐wise linear), a simple root‐finding method involving a combination of hyperbolic fits, linear interpolation, and Newton's method converges upon the highest strength (conservative) solution with a small number of iterations. The effect of the hysteretic smoothness on the occurrence of multiple roots is examined for two near‐fault and two far‐fault earthquake records, and for two measures of ductility and for normalized hysteretic energy. The results indicate how the smoothness of the hysteretic behavior affects ductility demand and constant‐ductility response spectra. Copyright © 2010 John Wiley & Sons, Ltd.     

SORPTION AND DESORPTION CHARACTERISTICS OF CADMIUM BY FOUR DIFFERENT SOILS IN NORTHEAST CHINA

1IN TR O D U C TIO NA s a persistentand toxic pollutant, cadm ium (C d) canresultin m any adverse health effects in a variety oftis-suesand organssuch asthe lung,kidney,urinary,blad-der,pancreas,breast and prostate (SA TA R U G etal.,2003).C adm ium in so…     

对影响招远市黄金矿山地质环境评价的几点认识

招远市黄金资源蕴藏丰富,开采历史悠久,素有“金城天府”之称,建国以来,累计向国家交售黄金近200t,是全国第一产金大市（县）。其矿山地质环境问题不同于一般的县市,通过对其矿山地质环境特点的分析,认为招远市金矿区矿山地质环境影响评价的重点为采空塌陷,地裂缝,渣石流等地质灾害及水环境等。     

基于Global Mapper的地貌晕渲制图——以西安幅(Ⅰ-49)为例

地貌晕渲图自动制图是以计算机软、硬件为基础,对DEM数据实现的一种三维立体可视化表达。本文从地貌晕渲的基本理论出发,以我国1:100万标准分幅的西安幅(1-49)为例,采用Global Mapper软件实现了计算机地貌晕渲自动制作的全过程,主要内容包括:计算机地貌晕渲关键技术的实现,地貌晕渲效果与参数设置之间的关系,Global Mapper软件中各种参数设置的合理性分析,使用分层设色的办法对晕渲图进行色彩的设计,并利用PHOTOSHOP软件对结果进行整饰等。该方法可实现地貌晕渲图的自动制图。     

Assessing the impacts of ecological-living-productive land changes on eco-environmental quality in Xining City on Qinghai-Tibet Plateau,China

The Ecological-living-productive land(ELPL) classification system was proposed in an effort to steer China's land pattern to an ecological-centered path, with the development model shifting from a single function into more integrated multifunction land use. The focus is coordinating the man-land contradictions and developing an intensive, efficient and sustainable land use policy in an increasingly tense relationship between humans and nature. Driven by socioeconomic change and rapid population growth, many cities are undergoing urban sprawl, which involves the consumption of cropland and ecological land and threatens the ecological balance. This paper aims to quantitatively analyze the critical effects of ELPL changes on eco-environmental quality according to land use classification based on leading function of ecology, living and production from 1990 to 2015 with a case study of Xining City. Also, four future land use scenarios were simulated for2030 using the Future Land Use Simulation(FLUS) model that couples human and natural effects. Our results show a decrease in productive land(PL) and an increase in ecological land(EL) and living land(LL) in Xining City. Forestry ecological land(FEL) covered the top largest proportion; agriculture productive land(APL) showed the greatest reduction and urban and rural living land(U-RLL) presented a dramatic increase. The eco-environmental quality improved in 1990-2010, mainly affected by the conversion of APL to FEL and GEL. However, the encroachment of U-RLL into APL, other ecological land(OEL) and FEL was the main contributor to the decline in eco-environmental quality in 2010-2015 as well as the primary reason for the increase area of lower-quality. The Harmonious Development(HD)-Scenario, characterized by a rational allocation of LL and PL and a better eco-environment, would have implications for planning and monitoring future management of ELPL, and may represent a valuable reference for local policy-makers.     

近2000年古里雅冰芯净积累量与南疆盆地南沿的干湿变化

利用1951-1991年古里雅冰芯净积累量、1951-2000年南疆盆地南沿的降水资料和1958-2000年NCEP/NCAR再分析的大气环流资料,讨论了它们之间的相互关系,并对其机理进行了初步分析,在此基础上建立了南疆盆地南沿近2000年高分辨率的干湿变化序列。     

Chinese overseas industrial parks in Southeast Asia: An examination of policy mobility from the perspective of embeddedness

The development of overseas industrial parks is a key component of the Belt and Road Initiative and an expected experimental way of promoting inclusive globalization by inventing new forms of cooperation between China and local host countries. Policy mobility, a classic theory within international political geography addressing the connection between local and global policies, has implications for overseas industrial parks development. In this paper, we argue that policies are not easily moved directly from one place to another; instead, policies are embedded due to the role of local actors in policy mobility. This article first provides an overview of seven China-Southeast Asia economic and trade cooperation zones identified by the Ministry of Commerce, and analyzes their key participants. It then discusses policy mobility by looking into the roles of revenue, land, and talent in developing these industrial parks. The paper finds that these parks face challenges, such as the complicated geographical environments of host countries, huge pressure from enterprise investment capital, the lack of overseas service platforms, and underdeveloped agglomeration economies. In the light of the current situation, policy suggestions for the future sustainable development of overseas industrial parks are put forward.     

两郧断裂郧县盆地段地质与地球物理特征研究

通过野外地质调查,结合地球物理探测手段,研究两郧断裂郧县盆地段地质与地球物理特征;参照两郧断裂带多个位置采集断层物质的SEM、TL测试成果,并结合本次对断层上断点沉积物OSL测年数据,对两郧断裂该段第四纪活动性进行分析。研究结果表明,两郧断裂在郧县盆地段埋深相对较深;断裂特征主要为逆断层,部分分支断裂显示为正断性质;断裂带最新活动时代为中更新世晚期-晚更新世早期。     

测绘生产计划统计管理应用系统的建立

基于windows软件平台及foxpro工具软件开发的“测绘生产计划统计管理应用系统 (PPCMAS)”是一种较为科学的测绘生产管理模式 ,具有较先进的技术性和通用性 ,并以多媒体方式实现信息查询和综合统计图形显示、文字说明及统计报表 ,解决了规划和管理等问题 ,提供了数据录入、资源查询、统计生成、专家系统壳、显示输出、信息通讯等多方面的功能     

古村落社区旅游参与度及影响因素——西递、宏村、南屏比较研究

以社区家庭为视角,建立基于利益导向的社区旅游参与水平测度指标,以皖南古村落西递、宏村、南屏为实证研究对象,揭示了古村落社区旅游参与度异同及其影响机理。研究结果表明:① 古村落内部、古村落之间的旅游参与度均有不同程度的差异,归因为家庭微观因子与社区中观因子交互作用所致。② 通过家庭微观因子对家庭人均旅游收入影响的通径系数分析,得出三个景区相应的直接通径系数和间接通径系数,发现古村落家庭微观因子的影响方向趋同而影响程度分异,与问卷调查结果分析的一致性也显示了该方法的较强解释力和潜在应用价值。③ 提高古村落社区旅游参与整体水平、缓解参与度空间差异的根本途径在于"让利于民",增强社区分利能力,政府在其中扮演着重要的引导角色。