Adapting to Global Change: Ageing,Urbanisation and Resilience

With climate change, natural disasters such as hurricanes, earthquakes and tsunamis are occurring worldwide with greater frequency. This is at a time when an expanding older population is living in cities, where it is proving one of the most vulnerable groups when a crisis hits, from evacuation to recovery. Here, Francesca Birks and Katherine Prater of ArupForesight + Research + Innovation consider design solutions that enable the liveability of cities for ageing residents in periods of disaster, as well as stability.     

墙趾可更换组合剪力墙抗震性能试验研究

为研究墙趾可更换组合剪力墙的抗震性能,设计并制作了2片带有可更换墙趾构件的波形钢板–混凝土组合剪力墙试件.采用拟静力试验和ABAQUS有限元软件模拟的方法,分析了内置波形钢板波纹方向对墙趾可更换组合剪力墙抗震性能的影响.试验结果表明:各试件墙趾构件先于主体构件破坏,且在达到极限位移角前其破坏主要集中于可更换墙趾构件;墙...     

考虑加卸载时长的路基土动态回弹模量测试方法及试验研究

路基土动态回弹模量是沥青路面结构设计中的重要参数,准确获取路基土动态回弹模量一直是道路工程领域的重要研究课题之一。在调研路基土动态回弹模量测试方法相关成果的基础上,通过有限元数值计算、试探性试验,建立考虑行车荷载加卸载时长影响的路基土动态回弹模量测试方法;选取两种典型的路基土,开展考虑行车荷载加卸载时长的动态回弹模量试验。试验结果表明：两种土质动态回弹模量随围压增大而增大,随循环偏应力、加载时长的增大而减小;随着加载时长的增加,路基土动态回弹模量减小可达34.6%,加载时长的影响不容忽视;不同加载时长下,路基土动态回弹模量随围压、循环偏应力的影响规律基本一致。     

标准模型下基于身份的强密钥隔离签名

如何应对基于身份的签名系统中密钥泄漏的问题,是一项非常有意义的工作.为了处理这一问题,利用Dodis等人的密钥隔离机制,提出了一种基于身份的密钥隔离签名.所提出出的签名方案具有两个显著的特点:(i)满足强密钥隔离安全性;(ii)其安全性证明无须借助随机预言机模型.     

一种构造高阶弹性函数的非线性方法

文章基于非线性级联的方法给出了两个具体的构造高阶弹性函数的方法。构造所得弹性函数整体上具有较好的密码学性质。     

柔性德育:大学生生命关怀不再缺位

高校思想政治工作必须围绕生命关怀展开,而柔性德育贴近生活,唤醒德育主体的公共意识、尊重意识、感恩意识和责任意识,与生命关怀有不可分割的"血缘"关系。柔性德育以刚性德育的存在为基础的,并不排斥刚性德育,其实质是在保持适度刚性的同时,更关注个体需求生活享用,尽可能地展现德育的柔情,接近人性的真善美。柔性德育为高校思想政治工作与生命关怀提供了一个绝佳结合点,让德育焕发新的生命力。     

Composite adaptive anti‐disturbance resilient control for Markovian jump systems with partly known transition rate and multiple disturbances

In this paper, the problem of composite adaptive anti‐disturbance resilient control is investigated for Markovian jump systems with partly known transition rate and multiple disturbances. The considered multiple disturbances include two types: one is external disturbance, while the other is an unexpected nonlinear signal which is described as a nonlinear function. Composite adaptive disturbance observers are constructed to estimate these disturbances, and the estimations are applied to feedforward compensation. Then a composite adaptive anti‐disturbance resilient controller is obtained. Furthermore, some sufficient conditions are presented in terms of linear matrix inequalities such that the closed‐loop system is stochastically stable with performance. Finally, a numerical example and an application example are given to illustrate the effectiveness of the proposed approach. Copyright © 2016 John Wiley & Sons, Ltd.     

弹性函数的计数

通过构造性的方法讨论弹性函数的计数,给出了弹性性最佳时的精确计数。     

以逐步积分法计算舰船柴油机隔振装置冲击响应

建立了描述舰船柴油机以隔振装置冲击响应的数理模型，并首次提出采用逐步积分法计算其响应，该算法具有程序简单、计算精度较高的特点，文末给出了算例。