Determination of the embedded electronic states at nanoscale interface via surface-sensitive photoemission spectroscopy

The fabrication of small-scale electronics usually involves the integration of different functional materials. The electronic states at the nanoscale interface ...     

First-principles study of multiple-site substitutions of alloying elements in Ni-based single crystal superalloys

The development of Ni-based single crystal superalloys relies heavily on the composition design with the addition of critical alloying elements,e.g.,Re and Ru.Understanding the role of alloying effects require to know the configurations of the alloying element distribution betweenγ-Ni andγ′-Ni_3Al phases and among various non-equivalent sites.This work employed firstprinciples density functional theory calculations to study the preference of phase and site occupancy of 11 alloying elements including Al and transition metal elements:3d (Ti,Cr,Co,Ni),4d (Mo,Ru),and 5d (Hf,Ta,W,Re) in Ni and Ni_3Al.We calculated the substitution energies of 1298 triple-site doping configurations including 286 Ni Ni Ni site doping of Ni,726 Al Ni Ni site doping,and 286 Ni Ni Ni site doping of Ni_3Al with alloying elements Ni,Co,Ru,Cr,Re,Mo,W,Al,Ti,Ta,and Hf.In the dual-site and triple-site doping of Ni and Ni_3Al,all studied alloying elements preferred to occupy Ni phase rather than Ni_3Al phase.We found that the most stable defect complexes often contained the favorable substitutions of Al,Ti,Ta,and Hf for the Ni sites that stabilized the alloying elements doping at the other one or two nearest neighbor sites.The co-substitutions of various alloying elements at multiple sites are critical to understanding the strengthening mechanism of alloying elements in Ni-based single crystal superalloys.     

基于PLC的紧凑型回旋加速器联锁保护系统

介绍了CYCHU10紧凑型回旋加速器联锁保护系统的实现方法.系统选取以PLC为核心,现场总线为网络构架,S7Graph为主要编程语言的技术路线,采用分布式结构和结构化程序设计方法,从硬件和软件上保证了联锁保护系统的可靠性、可维护性及可扩充性.应用结果表明,该联锁系统较好地整合了加速器各子系统,为加速器的安全稳定运行提供了保障,取得了理想的控制效果.     

印刷专业教师研讨会在河内举行

德国印刷促进会在国外为专业教师举办的第二次研讨会,于3月23日至25日在越南河内印刷工业学院(Hanoi college of printing industry)成功举办。出席研讨会的约50名专业教师,来自印尼和越南的10所不同的大学和培训中心。     

WIPO Panels’ interpretation of the Uniform Dispute Resolution Policy (UDRP) three-prong test

The Uniform Dispute Resolution Policy (UDRP) is a unique process that resolves domain name disputes effectively and inexpensively. This paper, through an analysis of the UDRP three-prong test, revealed that even though the UDRP affords a great degree of discretion to the WIPO Panels deciding any given case, there is some consistency and predictability inherent in the UDRP process.     

Tooth flank modification theory of dual-torus double-enveloping hourglass worm drives

In this paper, the theory of tooth flank modification is enriched and developed for a double-enveloping toroidal worm drive. The goal and significance of the modification are expounded from the point of view of changing the tooth flank configuration for the worm gear pair. It is pointed out that the constant center distance modification, the constant transmission ratio modification, and the combination of the previous two are the convenient and reasonable modification strategies. All the corrected hourglass worm pairs, attained by employing the preceding modification methodology, can be divided into two fundamental types: the type I worm pair and the type II worm pair, from the perspective of the meshing behavior. The division criterion of the worm drive type is moreover provided on the basis of the value range of the modification parameters in this study. The meshing characteristics of the two types of the modified globoidal worm drive are summarized in detail. The results indicate that the type II worm gearing with slight modification should be the preferred style for the double-enveloping toroidal worm drive.     

Theoretical Analysis of Diffraction Efficiency of Photocarrier Grating

The diffraction efficiency of the photocarrier grating (PCG) has been theoretically analyzed. Firstly, the model of the PCG has been set up, and the distribution of the carrier concentration has been studied. Secondly, the change in refractive index produced by the photocarriers has been estimated. Finally, a rigorous coupled-wave analysis has been employed to investigate the diffraction efficiency of the PCG. The results show that when the angle between the two excitation lasers increases, the change of the refractive index decreases, leading to a weak grating. The optimal incident angle of the probe laser is dependent on the angle between the two excitation lasers, and the relation between these two angles for the higher diffraction efficiency of the +1st forward-diffracted wave has been found. In terms of diffraction efficiency, the optimal parameters have been estimated, and the feasibility of the PCG to be a forward-diffracted component has been confirmed.     

对资金时间价值的再认识

在对资金时间价值的内涵进行分析的基础上,文章提出了资金时间价值应用中需要注意的一些事项。这对更好地运用时间价值的观念去解决实际问题具有参考价值。     

一起电加热器引起的故障分析及处理

方大特钢10000N·m3/h制氧机组分子筛电加热器运行中突然短路,引起了为其供电的配电变压器高压侧主回路综保动作、跳闸,造成该制氧机组工艺氩泵、氮透油泵、空压机排烟机等失电停机故障。通过分析,采取了相应的改进措施,提高了供电的安全性、制氧机组运行的稳定性。     

新能源与电网规划建设

探讨了在低碳观念逐渐普及、新能源方兴未艾的新形势下,电网应该抓住前所未有的巨大机遇,调整电网规划思路,提高发电比重、预留新能源电源点及其接入通道,大幅扩大电力市场规模,做大做强电网,使电网成为全社会能源供应的主平台。