钛合金双辉无氢渗碳中等离子体输运过程分析

针对钛合金耐磨性差、易吸氢而产生氢脆的特点,采用双辉无氢渗碳的方法对钛合金进行表面渗碳处理,在钛合金表面形成了含有高硬度TiC相的表面合金层.影响渗碳效果的诸多因素中,碳离子的产生、输运及在钛合金表面的吸附对渗碳效果起着决定性作用.粒子间存在着频繁的碰撞,在负偏压的作用下集体向阴极漂移,并有绕射现象.     

3G环境下传输网管应用研究

随着3G网络的建设,各运营商逐步搭建PTN和GPON等分组化城域传送网。文章首先分析传统的传输网管存在和急需解决的问题,然后通过分析现有的传输模型、数通模型和3G分组化城域传送网模型的特点和三个模型的关系,推出3G环境下传输网络和业务的性能管理方法,通过该方法建立一套业务性能管理指标体系。最后,阐述性能指标体系在具体场景的应用。     

电信级以太网PBT技术研究

主要针对业界普遍认可的电信级以太网PBT技术进行研究,重点阐述其技术提出的背景、发展和核心构架,并与提倡用于城域网的热门技术进行对比,分析各种技术的优势和不足,然后提出PBT技术与其他热门技术的共性和差异,最后对该技术进行了展望和预测。     

Effects of disorder on charge transport in semico++ nducting polymers

Polaron transport process in semiconducting polymers with disordered structure and morphology is simulated using a nonadiabatic evolution method. The simulations are performed within the framework of an extended version of the Su–Schrieffer–Heeger model modified to include diagonal disorder, off-diagonal disorder and an external electric field. It is found that the polaron transport mechanism is determined by the competition between the disorder and the electric field. For the case of pure diagonal disorder, the polaron transport undergoes a crossover from adiabatic drift to nonadiabatic hopping under a large scope of electric field (E < 2.0 mV/Å), whereas the field-assisted tunneling dominates charge transport for a higher electric field. For the combined disorder, it is demonstrated that the competition effects and the synergetic effects between the diagonal and off-diagonal disorder are equally important. The effects of diagonal disorder are negative in most cases, and the energetically easier pathways for charge transport are mainly opened by the off-diagonal disorder.     

Availability Analysis and Enhanced Availability Design in <Emphasis Type="Italic">p</Emphasis>-Cycle-Based Networks

p-Cycle protection is a fairly new survivability scheme that has the interesting properties of offering restoration speeds essentially the same as those offered by ring protection while requiring almost as little redundant capacity as adaptive mesh restoration [D. Stamatelakis, W.D. Grover, IEEE Transactions on Communications, vol. 48, no. 8, (August 2000), pp. 1262–1265]. This paper presents the first analytical consideration of the availability of paths in a network protected by p-cycles. Results confirm the importance that cycle sizes play in terms of availability and suggests principles or strategies for achieving high availability of paths in a network protected by p-cycles. Based on these insights, two new formulations for joint service path provisioning and capacity planning are proposed. The first one offers a way to improve the availability of selected service paths by using a different routing strategy for them than for regular service paths. The second formulation enables a new class of service paths that are offered two protection options instead of just one. That class of service paths is expected to see its availability improved in a quantum step way relative to the availability of paths having only one protection option.     

SHW46—1．6／150／90—AⅡ（65吨）型热水锅炉研制

介绍了大型往复炉排（65t）锅炉的研制过程及一些设计经验,为今后设计制造更大自然循环热水锅炉提供了一种借鉴。     

Sodium transport in polyimide-SiO2 systems

The use of polyimide (PI) in integrated circuits either as a passivant or as an interlevel dielectric requires an understanding of the potential for transfer of contaminant ions, always present to some degree in device-grade PI, from the PI to other device constituents. Sodium, in particular, if transferred from PI to SiO₂ where it is relatively mobile at typical device operating temperatures, could affect device thresholds and create a reliability problem. In this paper, the quasistatic Q-V technique of Brown using metal-PI-SiO₂-Si structures has been applied to the quantitative study of the transfer of Na between PI and SiO₂. Removal of the PI after cure or after application of bias-temperature stress has been used to demonstrate that (1) quantitative, reversible ion transfer between PI and SiO₂ does occur at temperatures above 200°C in the presence of an applied bias, but (2) in the absence of an applied bias, Na ions are not transferred from PI to SiO₂ during PI cure at 350°C. It is also shown that the kinetics of Na transfer from PI to SiO₂ in the presence of a bias are dominated by an activated diffusion process, with an activation energy on the order of 2.0eV and a prefactor on the order of 2x10⁹ cm²/s.     

Intelligent speed adaptation—Effects and acceptance by young inexperienced drivers

This study assessed the relative effects of two intelligent speed adaptation (ISA) systems (informative and actively supporting) on simulated driving performance and acceptability in a sample of inexperienced and experienced drivers. Participants drove a series of simulated drives under three conditions: no ISA (control), ISA informative and ISA actively supporting. The informative system significantly reduced speed and was particularly effective in reducing top-end speeds. Comparable reductions were not found for the actively supporting system. Differences in the effectiveness and acceptability of ISA systems were noted across experienced and inexperienced drivers. The ISA systems appeared more effective at reducing speeds for experienced drivers on some road types. Experienced drivers’ subjective satisfaction ratings of the systems also remained constant over the trial, whereas the inexperienced drivers’ ratings changed after experience. There was little evidence that drivers engaged in negative behavioral adaptation and no evidence that subjective workload levels increased with ISA use. Future directions for examining the safety benefits of ISA, particularly for inexperienced drivers, are discussed.