西藏大学工科实践教学改革研究

文章从西藏大学工科办学现状出发,分析了目前工科实践教学中存在的问题,并结合今后工科发展趋势及西藏社会对工科人才的实际需求,提出了工科实践教学改革措施和途径。     

Photonic crystals--a step towards integrated circuits for photonics.

The field of photonic crystals has, over the past few years, received dramatically increased attention. Photonic crystals are artificially engineered structures that exhibit a periodic variation in one, two, or three dimensions of the dielectric constant, with a period of the order of the pertinent light wavelength. Such structures in three dimensions should exhibit properties similar to solid-state electronic crystals, such as bandgaps, in other words wavelength regions where light cannot propagate in any direction. By introducing defects into the periodic arrangement, the photonic crystals exhibit properties analogous to those of solid-state crystals. The basic feature of a photonic bandgap was indeed experimentally demonstrated in the beginning of the 1990s, and sparked a large interest in, and in many ways revitalized, photonics research. There are several reasons for this attention. One is that photonic crystals, in their own right, offer a proliferation of challenging research tasks, involving a multitude of disciplines, such as electromagnetic theory, nanofabrication, semi-conductor technology, materials science, biotechnology, to name a few. Another reason is given by the somewhat more down-to-earth expectations that photonics crystals will create unique opportunities for novel devices and applications, and contribute to solving some of the issues that have plagued photonics such as large physical sizes, comparatively low functionality, and high costs. Herein, we will treat some basics of photonic crystal structures and discuss the state-of-the-art in fabrication as well give some examples of devices with unique properties, due to the use of photonic crystals. We will also point out some of the problems that still remain to be solved, and give a view on where photonic crystals currently stand.     

"知识工程"与少数民族地区新农村建设

论述了在少数民族地区新农村建设中开展“知识工程”的意义,介绍了“知识工程”的形式,并提出了几点建议。     

浅析GPS高程测量在水利工程中的应用

简要介绍了GPS高程测量的原理,结合其在水利工程中的应用实例,对GPS高程测量技术进行了探讨。     

临床医学工程技术在现代医疗机构的应用

文章通过查阅相关文献和实践,探讨临床医学工程技术在医疗仪器调试与临床应用中的价值及医疗仪器设备的技术管理与评价。     

如何加强公路工程材料管理

公路工程材料管理是工程成本管理的关键。从建立材料部、合理配置人员、制定材料管理办法等多个环节阐述了加强材料管理的方法和要求。     

浅谈桥梁桩基人工挖孔

在特定的条件下,桥梁桩基人工挖孔是一种既经济又快速的成孔方法。结合工程实践,详细阐述了人工挖孔的适用条件及其优缺点,总结出施工中合理的工具配备和人员安排的情况,并提出了挖孔作业中的若干注意事项。     

浅论钻探工艺与台班效益

通过对某公路勘察过程中两种不同钻探工艺的分析,浅论了钻探工艺与钻探台班效益的关系。     

锅柄的改良性设计

作为人机界面的锅柄,是锅具设计的重要环节.人操持锅柄的方式、姿势及舒适度,受制于锅柄的形态.通过对锅柄操作方式的解析,综合人机工程学、审美、技术与市场等多方面因素,辅以模型制作与实验等方法,获取了握柄类产品设计的成功经验.     

电工学中交变电流一些难点释疑

对电工学中有关交变电路学习的一些难点,如交流电的有效值,电感、电容对交变电流的作用,感应电动机的工作原理及输电等进行了阐述。