H型梁与矩形钢管柱单板简支连接性能

对H型梁和矩形管柱的单板简支连接的受力性能进行分析,着重研究节点连接对矩形管柱壁的影响.通过建立理论计算模型,提出了该连接节点的设计原则,并通过试验和有限元分析来验证理论模型的正确性,探讨该种连接形式的优点和缺点,得到了适合工程设计人员使用的该连接节点的设计公式.
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中图分类号： 文献标志码： A     

Evaluation of Novel 3D Architectures Based on Knitting Technologies for Engineering Biological Tissues

Textile-based technologies are considered as potential routes for the production of 3D porous architectures for tissue engineering( TE) applications. We describe the use of two polymers,namely polybutylene succinate( PBS) and silk fibroin(SF) to produce fiber-based finely tuned porous architectures by weft and warp knittings. The obtained knitted constructs are described in terms of their morphology, mechanical properties,swelling ability,degradation behaviour,and cytotoxicity. Each type of polymer fibers allows for the processing of a very reproducible intra-architectural scaffold geometry,with distinct characteristics in terms of the surface physicochemistry,mechanical performance,and degradation capability,which has an impact on the resulting cell behaviour at the surface of the respective biotextiles. Preliminary cytotoxicity screening shows that both materials can support cell adhesion and proliferation. Furthermore, different surface modifications were performed( acid /alkaline treatment, UV radiation,and plasma) for modulating cell behavior. An increase of cell-material interactions were observed,indicating the important role of materials surface in the first hours of culturing. Human adipose-derived stem cells( hASCs) became an emerging possibility for regenerative medicine and tissue replacement therapies. The potential of the recently developed silk-based biotextile structures to promote hASCs adhesion,proliferation,and differentiation is also evaluated. The obtained results validate the developed constructs as viable matrices for TE applications. Given the processing efficacy and versatility of the knitting technology, and the interesting structural and surface properties of the proposed polymer fibers,it is foreseen that our developed systems can be attractive for the functional engineering of tissues such as bone,skin,ligaments or cartilage and also for develop more complex systems for further industrialization of TE products.     

钢筋混凝土T形柱节点受力性能数值分析

采用ABAQUS分析软件,针对某钢筋混凝土异形柱框架结构中的T形截面柱进行数值分析,探讨用ABAQUS进行模拟时的关键性技术问题,获得该类异形柱从加载到破坏的受力全过程,获得了节点核芯区的破坏机理类别、节点的失效破坏方式和变形方式,对该类型的异形柱破坏性能和截面设计提供一定的理论基础.     

共混胶高温堵剂实验室研究

钠粘土与AM单体共混,在130℃下与引发剂和交联剂反应生成了共混胶。该共混胶体系中含钠土6%,单体AM 6%～7%,引发剂Y 100～200mg/L,交联剂J 1%～1.5%。钠土的加入,延缓了成胶时间,提高了热稳定性。该共混胶强度高,封堵能力强,高温堵水应用前景良好。     

应用型本科高校计算机类专业学生创新实践能力的培养——基于“恩智浦”杯智能车竞赛

针对应用型本科高校计算机类专业学生创新实践能力的培养，提出了一种以全国大学生“恩智浦”杯智能车竞赛为载体，分4个阶段逐步培养学生创新能力的培养体系。经过9 a多的努力，形成了良好的培养流程，学生获得优秀竞赛成绩、对口就业率提高。     

战时西安广播电台的创建与科技传播

通过文献调研和实地踏勘,对创建于1935年的西安广播电台及其自制天线、地线、发射传播装备技术和科学广播节目作了考察。认为该台的创建标志着中国西北地区无线电广播事业的开端,并认为张学良在其开播典礼上的讲话是为中国政要关于无线电广播科技知识的最早一篇广播稿范本,而且作了很贴切的口语化处理,以苏俄建设伯力无线电台中心网为例,强调无线电在启迪民智、传达消息、统制舆论方面的重要功能,从而丰富了早期科技广播稿体裁的内涵与外延。     

荧光法测定叶绿素a的影响因素及其数据校正

研究了浊度、温度对叶绿素a现场荧光仪测定叶绿素a的影响。分别用可见光分光光度计和叶绿素a现场荧光仪测定了不同温度、浊度梯度下小球藻水样的叶绿素a浓度值,探究影响规律和修正方法。结果表明,温度在7~30℃范围内,对叶绿素现场荧光仪测定叶绿素a浓度无显著影响;浊度在0~1 000度范围内,需用叶绿素a浓度实测值减去0.0174倍的浊度值(度)对测定值进行修正。     

基于丝网印刷技术的电化学酶联免疫吸附

为研究基于丝网印刷技术的电化学酶联免疫吸附(ELISA)的效果,在塑料基板上印刷96孔电极单元,形成标准96孔ELISA检测板,建立电化学检测与ELISA实验的关联,检测板每孔底部为独立电化学单元,由碳电极、对电极和银参比电极组成,形成双面印刷基板,基板通过96×3针式镀金特定连接器连接至恒电位仪。结果表明,96孔三电极电化学丝网印刷电化学阵列作为ELISA检测是可行的,多通道恒电位仪可同时测量8个孔数据。     

存在执行器故障的多智能体系统的容错一致性

考虑了同时存在执行器故障以及外部扰动下领航-跟随多智能体系统的容错一致性问题,其中,执行器故障由执行器增益变化来刻画;针对可能的执行器故障,设计具有自适应增益的补偿控制律,并与标称控制律共同作用来实现容错一致性,在进行增益系数以及控制律设计中,均采用相对输出信息而非相对状态信息;通过分析闭环跟踪误差系统的渐近稳定性,给出原来多智能体系统实现容错一致性所需满足的条件.结果表明,在未知扰动以及领航者输入范数满足一定条件下,通过适当选择参数可以实现容错一致性的目标.最后,采用数值仿真验证了所得结果的有效性.     

Preface

正All-optical implementations of signal processing have attracted a great deal of attention due to the unique potential of this approach to overcome the bandwidth and speed bottleneck of electronic devices.Many all-optical signal processing techniques,offering processing bandwidths up to several THz,have been proposed and successfully employed in a wide range of areas,such as