网络与政治:二元互动发展

网络与政治处于一种系统联系之中,二者的相互作用构成了它们之间的互动发展。一方面,在技术政治化和政治技术化的过程中网络推动政治的发展;另一方面,政治通过干预和控制网络技术促进网络的发展。     

创新职教机制 培养一流技工

根据市场需求，我们必须科学合理地设置专业和学制，适时地调整课程结构，优化教学内容、教学过程、教学方法和手段。利用有利条件，培养名优教师，创办有特色的专业，培养优秀学生和一流技工。要进行创业教育，培养“小老板”，为学生就业开辟一条新路，以职教质量在市场中取胜。     

Low-threshold vertical-cavity surface-emitting lasers based onoxide-confinement and high contrast distributed Bragg reflectors

The interest in low-threshold vertical-cavity surface-emitting lasers (VCSEL's) is increased by the demonstration of the small size, low loss optical mode due to oxide-confinement in the Fabry-Perot microcavity laser. Intense recent work in this area has resulted in numerous record breaking demonstrations of low-threshold current, high wall-plug efficiency, and high speed. In this paper, we discuss the impact of the dielectric cavity design to enhance control of the optical mode. We argue that high contrast dielectric mirrors can become an important design approach, especially for small apertures limited by diffraction loss. Experimental results are compared for different types of mirror and aperture designs     

Ag(Ⅰ)-5-Br-PADAP-SDS 体系的褪色分光光度法测定硫化物的研究

在ｐＨ５．３～６．６的ＨＡｃ－ＮａＡｃ缓冲介质中，有十二烷基硫酸钠存在，硫化物使Ａｇ（Ⅰ）－５－Ｂｒ－ＰＡＤＡＰ络合物的颜色减退。Ｓ２－在０～５μｇ／２５ｍＬ范围，吸光度减弱与Ｓ２－浓度成正比。其表现摩尔吸光系数为１．２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。方法用于污水中硫化物的测定，结果满意。     

再生核空间 H_0~1[a,b]中样条插值算子

讨论了再生核空间Ｈ１０［ａ，ｂ］中，样条插值算子、分段再生核插值算子及最佳插值逼近算子的一致性．这一结果，不仅深化了对再生核空间中插值逼近问题的研究，而且应用这３种算子可相互取长补短，灵活运用，为数值计算提供了方便．     

最少量化在实验研究产生的放射性废物管理中的实施

通过源项的引入控制、实践正当化、安全与防护最优化、废物产生的课题化管理、分类收集分别处理等措施的实施，落实废物最少量化在核科研中的实施，减少对环境的危害，降低废物处理处置费用，促进核技术的发展应用。     

Comparison of corrosion behavior of zirconium bombarded with self-ion and molybdenum ion

In order to study the effects of zirconium and molybdenum ion bombardment on the aqueous corrosion behavior of zirconium, one group of specimens was implanted with zirconium ions with ions surface densities ranging from 1 × 10¹⁵ to 2 × 10¹⁷ ions/cm² at about 170 °C, using a metal vapor vacuum arc (MEVVA) source operated at an extraction voltage of 50 kV. The other group of specimens was bombarded with molybdenum ion with ions surface densities ranging from 1 × 10¹⁶ to 5 × 10¹⁷ ions/cm² at about 160 °C, using a MEVVA source operated at an extraction voltage of 40 kV. The valence states and depth distribution of elements in the surface of the samples were analyzed by X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), respectively. Polarization curves measurement was employed to evaluate the aqueous corrosion resistance of the zirconium samples in a 1N H₂SO₄ solution. It was found that the aqueous corrosion resistance of zirconium implanted with 5 × 10¹⁶ Zr ions/cm² is the best in first group samples. For molybdenum ion implantation, the aqueous corrosion resistance of samples declined with raising ions surface densities. The natural corrosion potentials of zirconium samples bombarded with self-ions are more negative than that of the as-received zirconium. While, as for molybdenum ion implantation, the results are opposite. Finally, the mechanisms of the corrosion behavior of the zirconium samples implanted with zirconium and molybdenum ions are discussed.     

浅析防火墙技术

随着计算机网络系统的迅速发展和广泛应用,网络及信息安全的问题越来越受到人们的高度重视.探讨了防火墙系统的结构以及防火墙系统功能、拓扑结构的选择.     

湿法冶炼浸出过程H∞优化控制研究与设计

应用H∞优化控制方法对锌湿法冶炼浸出过程进行H∞优化控制器设计,同时,讨论了如何把浸出过程控制问题转化为H∞优化控制问题、浸出过程的输入输出量和H∞标准控制问题各量之间的关系及其物理意义.通过仿真实验,给出了几种情况下的仿真曲线,并进行了分析,从而得出结论.