A Microscale Approach for the Seismic Response of MDOF Structures Including Soil-Foundation-Structure Interaction

In this article, a three-dimensional microscale computational framework utilizing the discrete element method is presented to analyze the seismic response of soil-foundation- MDOF structure systems. The proposed approach is used to explore the response of MDOF structures on a square embedded footing founded on a dry granular deposit. Computational simulations were conducted to investigate the response of the system to several base excitations. The impact of replacing a MDOF structure with its equivalent single degree of freedom (ESDOF) structure while accounting for soil-foundation-structure interaction (SFSI) is investigated. Detrimental or beneficial effect of SFSI on the response is also examined.     

中国旅游经济增长周期的测度与评价

旅游经济的稳定增长是影响区域旅游经济增长质量的关键因素,也是区域旅游经济发展质量和水平的重要标志。文章采用增长率法对中国旅游经济增长进行了测度,并对2014年至2016年中国的旅游经济的稳定性进行了预测。研究发现,中国旅游经济增长整体上呈现出典型的周期性,平均持续时间3-4年,属于典型的短周期,并且周期持续的时间趋短,说明中国旅游经济已经走过了大起大伏的阶段,旅游经济增长的稳定性日益增强,正在形成抵御外部风险和冲击的稳定机制。     

论党内民主主体素质的提高

党员是党内民主的主体,党员队伍的民主素质决定党内民主的实现和发展程度,党内民主制度的制定和实施也只有在党员民主素质全面提高的基础上才能收到预期的效果,这就决定了提高党员民主素质是进一步发展党内民主的基础工作。新时期,提高党员民主素质的重点是增强党员民主意识。只有进一步肃清封建残余思想的影响、改善党内民主生活氛围、加强党内民主制度建设,党员民主素质才能得到切实提高。     

古籍新证的典范——论于省吾先生的《周易》研究

本文对于省吾先生的《周易》研究进行了回顾与评价,总结出五个特点,这些特点对于今天的易学研究者很有借鉴意义,有助于推动易学研究的深入发展。     

Evaluation of 2D Seismic Site Response due to Hill-Cavity Interaction Using Boundary Element Technique

This paper deals with the evaluation of two-dimensional site-effects due to the seismic interaction between hills with various configurations and underground cavities. The time-domain boundary element method is used to evaluate the site-effects of hill-cavity interaction subjected to vertically propagating in-plane SV and P waves. The presence of an underground cavity and the hill topography are expected to induce significant effects on the surface ground motion. To further examine the contribution of the amplification ratio of the hill-cavity system, a fairly simple approach, which can compute the response spectra of the hill’s surface motion above a cavity based on the real input motions, is also used to input motions.     

Experimental Study on the Seismic Performance of Superimposed RC Shear Walls with Enhanced Horizontal Joints

The seismic performance of superimposed reinforced concrete (RC) shear walls is decreased by rocking behavior and damage concentration at the horizontal joint. An enhanced horizontal joint method is proposed to improve the corresponding seismic performance. To validate the reliability of the proposed method, three full-scale superimposed walls and a cast-in-place shear wall (for comparison) are designed and tested under the quasi-static load. The test results indicate that the rocking phenomenon can be prevented using the proposed method, and the seismic performance of superimposed RC shear walls with enhanced horizontal joints is comparable to that of the cast-in-place RC shear walls.     

Simulation for Ludian (August 3, 2014, MW 6.2) and Nepal (April 25, 2015, MW 7.8) Earthquakes with Improved Stochastic Point Source Method

The Ludian earthquake (M_W 6.2) and Nepal earthquake (M_W 7.8) are parameterized and then simulated using a new improved version of the stochastic point source method based on a proposed equivalent distance (R_EQL) measure. The improved method considers uniform slip distribution along the fault and is validated by comparing the simulated Fourier response spectrum. Simulated ShakeMaps of Ludian and Nepal earthquakes in terms of PGA also indicate that the results of the improved method are in good agreement with finite-fault method with high efficiency.     

Seismic Stability of Slope Considering Rayleigh Wave

In the present paper factor of safety of slope under seismic loading condition is evaluated assuming circular failure surface. Using Fellenius method the center of most critical circle is located. Adopting limit equilibrium method, under the influence of weight of potential sliding mass and seismic inertia forces, factor of safety is evaluated considering Rayleigh wave along with primary wave and shear wave. Results are presented and compared with the available results from literature. Detailed parametric studies are also carried out to observe the variation of safety factor at different soil strength and seismic forces.     

1995至2010年中外节事研究的比较和启示

本文以中国期刊网CNKI数据库和国际学术界具有较高权威性和较大影响力的节事、旅游研究期刊中检索到的1995年至2010年间的554篇节事研究学术文献为研究文本,运用内容分析法及简单的文献计量学方法,对文献的关键词、研究方法、研究地域范围及研究者情况等信息进行统计、分析和比较,探讨中外节事研究的异同、趋势及特点,在此基础上提出对中国节事研究进一步发展的启示和思考。     

The removal estimator: A ‘probable numbers’ statistic that requires no matching

The probable number of individuals (PNI) estimators all require that we be able to match left-right paired bones reliably. The problems of matching are outlined and ways of addressing them are reviewed. It is shown that archaeozoological studies in which reliable matching is difficult raise analytical problems similar to those faced by population biologists unable to use classical release-recapture methods. The removal estimator has been used to estimate the size of whale populations from incomplete census data. It can be generalized into archaeozoology to produce either a simple PNI statistic of the matching type, or a statistic that does not require reliable matching.