巢湖合肥区底泥污染物分布评价与相关特征研究

测定了巢湖合肥区底泥有机质、总氮、总磷、铅、镉、铬、汞和砷的含量,并研究了垂直分布特征。用潜在危害指数法对底泥污染作了评价。对有机质与其他污染物之间的关系作了相关分析。其中有机质与总氮之间的线性相关方程为：y=0.0676x+0.0952,相关系数0.986,线性高度显著。     

兰州市区太阳辐射资源及冬季大气污染对太阳辐射的影响

本文利用兰州市实测水平面太阳辐射值，计算出了南立面、东、西、北立面可利用的太阳辐射投射量，可供太阳能工程设计者参考。并对兰州市区冬季大气污染对太阳辐射影响进行了定量的对比计算。     

基质金属蛋白酶在肿瘤细胞侵袭和 迁移中的作用

基质金属蛋白酶是一类锌离子依赖的、能够降解细胞外基质的内肽酶,它通过降解细胞外基质促进肿瘤细胞的侵袭和转移;现就基质金属蛋白酶在肿瘤细胞侵袭和转移过程中的作用以及基质金属蛋白酶与临床恶性肿瘤的相关性进行简单综述。     

数字图书馆在电子教学中的应用研究

讨论了数字化环境下图书馆应该为学习者提供的服务内容,研究了数字图书馆建设中的实用性,分析了电子教学与科研所带来的机遇与挑战,并指出了在协同环境中人为因素的重要性.     

Microwave oscillations of a nanomagnet driven by a spin-polarized current

The recent discovery that a spin-polarized electrical current can apply a large torque to a ferromagnet, through direct transfer of spin angular momentum, offers the possibility of manipulating magnetic-device elements without applying cumbersome magnetic fields. However, a central question remains unresolved: what type of magnetic motions can be generated by this torque? Theory predicts that spin transfer may be able to drive a nanomagnet into types of oscillatory magnetic modes not attainable with magnetic fields alone, but existing measurement techniques have provided only indirect evidence for dynamical states. The nature of the possible motions has not been determined. Here we demonstrate a technique that allows direct electrical measurements of microwave-frequency dynamics in individual nanomagnets, propelled by a d.c. spin-polarized current. We show that spin transfer can produce several different types of magnetic excitation. Although there is no mechanical motion, a simple magnetic-multilayer structure acts like a nanoscale motor; it converts energy from a d.c. electrical current into high-frequency magnetic rotations that might be applied in new devices including microwave sources and resonators.     

近岸海漂垃圾自驱动收集装备的研制及应用

长期、有效地治理近岸海域海漂垃圾，解决人工收集近岸海漂垃圾效率低的问题，研制出以波浪能/太阳能为动力，由V字型浮围栏和垃圾收集系统两部分组成的近岸海漂垃圾自驱动收集装备。现场试验结果显示，布放此装置后，海滩海洋垃圾的单位面积数量由原来的每平方米053 个降为017 个，单位面积质量由37 g·m-2降为12 g·m-2，海滩环境质量由较差/差上升为中等。表明该装备可实现近岸海漂垃圾的自动、长期、有效治理。