钢管混凝土柱压弯剪试验与有限环层分析

文中概要记述21件钢管混凝土柱的试验资料,通过它与钢筋混凝土柱受力性能的比较,证实钢管混凝土柱的强度高、延性好。试验得知短柱的应变分布与剪跨比有关,钢管混凝土柱的受力为空间应力状态。在试验研究同时,应用电子计算机计算了钢管混凝土柱的应变与应力分布,采用的是有限环层法,实例计算结果与试验所得规律基本符合。     

无压渗透法制备颗粒增强铝基复合材料的工艺及渗透机理初探

提出一种制备颗粒增强铝基复合材料的新方法一无压渗透法。采用该法，可在空气气氛下，于８００￣１０００℃温度范围内，无需借助外加压力或真这代，也不需对增强颗粒进行预处理，可使铝或铝合金液自动地渗入颗粒填料内部，从而形成具有良好结合的复合材料。对其渗透机理进行了探讨。     

基于环形缓存技术的数据采集实现

讨论了无限长度数据采集系统中，实现数据实时连续采集和处理的方法与途径。通过分析双缓存采集技术的不足，提出了环形缓存技术实现无限长度数据连续采集。着重讨论了环形缓存技术的工作机理和实现方法，并通过在一心电信号采集系统运用，取得了较好的效果。     

基于Matlab的电力系统中发电机稳定性控制的研究

互联电网的传输能力和安全运行与电力系统稳定性密切相关,提高电力系统的稳定性一直是电网发展的重点.论文基于Matlab构建电网的仿真模型,模拟调速系统和励磁系统对发电机的控制作用.仿真结果表明,调速系统和励磁系统能对电力系统中的发电机进行有效的稳定控制,为实现抑制低频振荡,进一步提高电力系统的稳定性奠定了基础.     

Reconstruction of sand wave bathymetry using both satellite imagery and multi-beam bathymetric data: a case study of the Taiwan Banks

Sand waves are a widespread bed-form in the tidal environment. Their formation, migration, and other properties have great significance in the fields of geology and oceanography. Currently, research on sand waves is mainly based on multi-beam bathymetric (MB) data. For large sand wave regions, however, the acquisition ability of MB data becomes limited; instead, interval-line measurement is adopted but with the inherent problem that it cannot achieve the full spatial coverage required. Reconstructed sand wave bathymetry (SWB) using interpolation algorithms cannot reflect the real SWB either. In this article, we propose a new approach in using both satellite imagery and MB data to reconstruct SWB, which takes advantage of characteristic information (ripple and crest) of SWB rendered in satellite imagery and MB data. The new approach is exemplified by a case study of the Taiwan Banks. We use the imagery obtained by the Charge-Coupled Device from the Small Satellite Constellation for Environment and Disaster Monitoring and Forecasting, and the MB data from R2Sonic to reconstruct the digital elevation model. The results show that the root mean square error of the reconstructed water depth is 1.47 m (compared to the MB data not using this approach), suggesting that the new approach is effective in reconstructing SWB. This approach allows a reduction in MB data track density, which may lead to an improvement in efficiency.     

大中型商场空调系统的节能设计

本文分析了商场夏季提高室内设计温度的节能问题；介绍了回收排风能量的换热器与空调机组合的形式、设计特点、经济效益；提出了一种利用商场排风充当风冷热泵机部分进风而节能的新方式。     

Diversity and distribution of free-living and particle-associated bacterioplankton in Sandusky Bay and adjacent waters of Lake Erie Western Basin

Studies on the bacterial communities in Lake Erie have been largely focused on cyanobacteria. To characterize the community structure of the other bacteria, we examined the 16S rRNA gene content of free-living (FL) and particle-associated (PA) bacterioplankton populations in Sandusky Bay (SD) and adjacent waters in the Western Basin (WB) of Lake Erie. A comprehensive survey of nutrients and other limnological variables was also performed in parallel. A total of 18,569 of 16S rRNA V6 pyrotag sequences were recovered, which were affiliated with 64 unique bacterial orders within 14 phyla. FL bacteria were composed differently from PA ones and contained significantly more Actinomycetales. In addition, FL bacteria were taxonomically more diverse. Despite the distinct environmental conditions, compositional variation was insignificant between bacteria in the SD and WB samples.     

阴极型阻锈剂在氯盐混凝土中阻锈效果的研究

以探究含氯盐混凝土内阴极型阻锈剂的阻锈性能为目标,借助半电池电位法、钢筋失重法、线性极化法、交流阻抗谱法、X-射线光电子能谱(XPS)等方法,研究了不同阴极型阻锈剂的阻锈性能和掺量之间的关系。结果表明：在掺入阴极型阻锈剂（苯并三氮唑BTA,N,N-二甲基乙醇胺DMEA）的含氯盐混凝土中,钢筋的锈蚀情况较未掺入阴极型阻锈剂时有较大的改善;相同阻锈剂掺量下,BTA阻锈剂的阻锈效果优于DMEA阻锈剂;根据试验结果预测BTA阻锈剂阻锈效果在掺量比为m(Cl^-)∶m(BTA)=1∶4会更好,DMEA阻锈剂阻锈效果在掺量比例为1∶2~1∶4之间最佳。     

分子动力学模拟中基于GPU的范德华非键作用计算

GPU最初是专为图形渲染而设计的.近年来已经演化为高并行度、多线程、具有强大计算能力和极高存储器带宽的通用多核处理器,目前主流GPLJ的峰值计算能力通常可达CPU的数10倍.这提供了1种解决大计算量难题的新的可能.分子动力学模拟需要极强的计算能力.故使用GPU来进行分子动力学模拟的尝试是很自然的选择.本文基于NVIDIA的GeForceGTX295 GPU和CUDA2.3开发环境实现了范德华力计算、范德华势能计算和基于网格的邻居搜索.在邻居搜索算法实现中,对于不同计算能力的GPU给出了不同的实现策略.对36万粒子规模的高分子聚乙烯体系算例的测试表明:1个时间步的计算结果与计算性能突出的分子动力学软件GROMACS相应的计算结果一致(运行在工作站Intel Xeon E 5405上),相对于CPU单核计算性能有大幅提高,其中邻居搜索加速了17倍,范德华力计算加速了47倍;并且解决了邻居搜索时的边界问题.虽然本文是针对范德华力的计算,但是策略是通用的,其他方向的研究人员也可以参考.测试结果表明,使用 GPU来加速较大规模计算量的计算是可取的.     

醇解法合成锥形氧化锌纳米粉体

采用非水解法予150℃在乙二醇溶漳中合成了氧化锌粉体,用X射线衍射、透射电子显微镜和Fourier红外光谱对其进行了表征.结果表明:在乙二醇溶液中,可在较低的温度(150℃)制备出锥形纳米氧化锌粉体.所合成的纳米氧化锌以取向黏附的方式沿(002)方向进行择向生长,并呈现出强烈的紫外发射现象.