芦山7.0级地震强震动记录及其震害相关性

以包含残余永久位移和(或)速度脉冲的强震动记录为重点分析对象,针对强震动滤波以及基线校正方式等不同处理方式对结构弹塑性响应的影响展开对比研究。考虑了多项式基线校正,Butterworth因果滤波,以及基于残余位移趋势线基线校正等几种常用的强震动记录处理流程和方法。首先以2018年台湾花莲地震,2014年云南鲁甸地震,日本311地震等代表性的强震动记录为输入,通过单(多)自由度体系以及典型平面RC框架的数值模拟结果,从结构弹塑性反应谱,层延性需求,以及最大层间位移角等方面对比研究了不同记录处理方式的影响。对比结果表明速度脉冲形状与相位是否完整保留对于结构的弹塑性响应有很大影响,对于包含速度脉冲或(及)永久位移的强震动记录,Butterworth因果滤波在滤除噪声的同时不仅消除了地表残余永久位移,同时使速度脉冲形状产生了畸变,并会传递到最后的弹塑性时程分析结果中,且对短,中,长周期结构均可能产生影响,该文推荐采用基于基线趋势线校正的处理方法对该类近断层记录进行逐条处理。最后,对于不含速度脉冲也不含永久位移的强震动记录,该文中弹塑性时程分析结果表明记录处理方式的影响并不显著。为了尽量消除因果滤波对记录时程相位谱的影响,我们给出了基于非因果滤波的批量化强震动记录处理流程供参考。     

A framework for understanding institutional factors affecting the success and failure of offshoring models in India

The objective of this paper is to identify and analyse the factors that influence offshore location decisions from an institutional theory perspective. In the years, emerging economies have shown great growth potential and have attracted significant foreign direct investment, especially from companies willing to set up operations. Despite such a seemingly favourable trade environment, not all companies that entered an emerging economy have been successful. Thus, there is a need to understand the factors that influence the success of any offshore location decision. It is also important to understand the relative importance of these factors, in order to develop novel insights useful to practitioners. There is a lack of literature addressing this issue, which this study aims to fill. We conducted a multi-case analysis with examples of European companies entering India. The findings indicate that successful companies employed locally focused business strategies that enabled them to acquire important relationships and knowledge, and also to adapt to formal institutions, including governmental and regulatory procedures. It was found that, irrespective of size, disregarding collaborative strategies was the main reason for exiting India. These findings are highly relevant for managers and policy makers.     

Microcracking and porosity in calcium phosphates and the implications for bone tissue engineering

Calcium phosphates including hydroxyapatite (HA) have been widely studied as bone scaffold materials. However their mechanical properties are highly variable and may be a function of thermal expansion anisotropy (TEA) induced stresses and microcracking. There is confusion concerning the mechanisms and microscopic identification of microcracks in HA. This study presents clear evidence of microcracking from micrographs of as-sintered HA surfaces which avoids the complications of identifying TEA-induced microcracks on fracture surfaces. Additionally, the existing literature of TEA-induced microcracking is briefly reviewed and pertinent papers involving likely microcracking in HA are analyzed. The recent realization in the biomedical literature notes that microcracks are of critical importance in remodeling and repair of damaged bone tissue. Hence, the similarities between microcracking in HA used for scaffolds in bone tissue engineering and that in the normal bone repair process is of importance in designing HA scaffolds with improved mechanical properties and biocompatibility.     

新语境下面向青年群体的敦煌文创设计策略研究

目的 针对敦煌文创产品在新语境下的艺术价值再现问题,探讨使产品更好地融入青年群体生活的设计策略,激发敦煌艺术在文创中的潜能。方法 对敦煌文创产品和青年群体调研,结合对青年“二次元文化”和“飞天”形象的研究,运用双钻石模型理论,分析设计问题的阐释语境和未来产品交互模式的方案语境,探寻敦煌艺术形象文创设计策略。结果 在问题语境中,观察青年群体的行为方式和对艺术形象的认知,定义核心的文创概念;在方案语境中,通过思考艺术形象的文化价值和精神意涵,对产品原型进行赋能,提出富有生活激情的、体现新型交互模式的文创设计策略。结论 提出面向青年群体,充盈时代精神意涵的文创设计策略,即敦煌艺术精神体现在创新的产品交互体验中,设计策略聚焦在具有中国特征的青年文化及其行为模式上,为传播敦煌文化而量身打造敦煌文创。     

Metallic ions as therapeutic agents in tissue engineering scaffolds: an overview of their biological applications and strategies for new developments

This article provides an overview on the application of metallic ions in the fields of regenerative medicine and tissue engineering, focusing on their therapeutic applications and the need to design strategies for controlling the release of loaded ions from biomaterial scaffolds. A detailed summary of relevant metallic ions with potential use in tissue engineering approaches is presented. Remaining challenges in the field and directions for future research efforts with focus on the key variables needed to be taken into account when considering the controlled release of metallic ions in tissue engineering therapeutics are also highlighted.