激光隐形切割技术在智能卡领域晶圆切割上的量产应用

随着智能卡产品的不断更新发展,行业普遍应用的金刚刀划片已经不能满足产品加工的需求,激光隐形切割技术已经开始逐步在智能卡领域使用。本文将结合智能卡类产品讲述激光隐形切割技术的量产应用。     

Mak16p is required for the maturation of 25S and 5.8S rRNAs in the yeast Saccharomyces cerevisiae

The nucleolar Mak16p protein of Saccharomyces cerevisiae has been implicated in 60S ribosome biogenesis. To learn more about the role of Mak16p in this process, ribosomal RNA processing was examined in a mak16-1 temperature-sensitive yeast strain. Steady-state levels of the 25S and 5.8S mature rRNA species dropped dramatically over a 4 h period in the mak16-1 yeast after a shift to the non-permissive temperature, while 18S and 5S rRNA levels decreased only moderately. Ribosomal RNA processing (rRNA) analyses showed that the most prominent defect at the non-permissive temperature was a dramatic decrease in 27SB precursor RNA levels, with no significant increase in the levels of any precursor. These data indicate an essential role for Mak16p in the stability of the 27SB precursor rRNA. Association of Mak16p with the 66S preribosomal complex does not appear to be sufficient for its function, because the mutant Mak16-1p protein was detected in sucrose density gradient fractions corresponding to the 66S pre-RNP complex.     

Exuberance,I Don't Know; Excess,I Like

Hernan Diaz Alonso redefines ‘excess’ and ‘exuberance’ on his own terms. Fully au fait and comfortable with the excessive, he describes how in relation to his own work he views excess as more of a tendency or a logic, which sums up his approach; whereas he perceives the exuberant as removed from the design process and more like an ‘adjective’, an ‘emerging quality’ observed by others. Copyright © 2010 John Wiley & Sons, Ltd.     

军用车辆的可见光隐身迷彩设计研究

对军用车辆进行了可见光隐身小斑点迷彩的研究与设计。首先明确军用车辆可见光侦察威胁的主要方式,并确定定性评价体系。在国内外现有军用迷彩标准体系的基础上,探讨可见光侦察检测方法和新型小斑点迷彩的设计方法。选取典型战场背景,利用计算机辅助设计小斑点迷彩的图样、颜色及车身配置等,形成了一种车型的隐身迷彩设计方案。利用计算机图像边缘检测方法,验证了设计方案,实现了缩小目标与背景的颜色差别,达到了降低目标显著性和改变目标外形视觉的目的。由此验证了小斑点迷彩设计方法在军用轻型轮式车辆反可见光侦察技术中的可行性和优越性。     

浅谈吸波涂料工程化应用中的常见问题

系统地论述了吸波涂料在工程化应用中附着力不稳定,涂层过厚,面密度大,隐身频带窄,吸收强度低,隐身涂层还不能承受恶劣的海洋环境和耐大气老化考验,现场施工与后期的维修较困难等一系列常见问题.凭借多年吸波涂料工程化应用的经验,深入分析了吸波涂层常见问题产生的原因,结合相关文献提出了一些解决途径,对下一代吸波涂料的研究和发展具有重要的指导意义.     

试论《诗经》国风的俗文学特性

本文根据郑振铎先生提出的关于“俗文学”的论述,从《诗经》国风的创作源头、创作素材及创作的艺术特色等方面论述《诗经》国风的俗文学特性。     

Analysis of ground target stealth based on Passive Millimeter-Wave detection

Passive Millimeter-Wave（MMW）detection has become a threat to ground targets.To enhance the survivability of the ground target in the future battlefield,passive MMW stealth technology is analyzed in this paper.Based on the passive MMW detection principle,computation and analysis are made for the MMW apparent temperature of tank in different actual combat conditions.The necessity of the passive MMW stealth is analyzed and the passive MMW stealth methods are also studied.     

非均匀等离子体包覆平板模型微波反射功率测量与分析

介绍了等离子体隐身技术的原理性试验。在大气环境中利用已有的微型固体火箭发动机作为等离子体发生器进行试验,控制发动机喷流流场中的电子密度分布,采用微波反射仪测量金属平板在有无以及不同电子密度喷流包覆情况下的微波反射功率。试验结果表明,峰值电子密度为1011 e/cm3的非均匀等离子体对9.5GHz的微波具有明显的吸收作用,并且试验结果和数值计算结果吻合较好。通过试验,验证了等离子体隐身的特性,为下一步开展等离子体隐身研究打下基础。     

Does agency matter?: Exploring the impact of controlled behaviors within a game-based environment

When students exhibit control and employ a strategic plan of action over a situation they are said to be demonstrating agency (Bandura, 2001). The current work is comprised of two studies designed to investigate how agency manifests within students' choice patterns and ultimately influences self-explanation quality within the game-based system iSTART-2. In Study 1, 75 college students interacted freely within iSTART-2 for 2 h. Random walk and Entropy analyses were used to quantify the amount of control demonstrated in students' choice patterns, as well as to determine the relation between variations in these patterns and self-explanation performance within iSTART-2. Overall, students who demonstrated more controlled choice patterns generated higher quality self-explanations compared to students who exhibited more disordered choice patterns. This link between performance and controlled choice patterns is hypothesized to be driven, in part, by students' experiences of agency. That is, engaging in controlled patterns should be advantageous only when doing so is a result of students' strategic planning. In Study 2, this hypothesis was tested by assigning 70 students to a choice pattern (i.e., controlled or disordered) that had been yoked to students from Study 1, thus removing students' ability to exert agency over the iSTART-2 system. Results revealed no differences in self-explanation quality between the groups assigned to controlled and disordered choice patterns. Collectively, findings from these studies support the notion that success within game-based systems is related to students' ability to exert agency over their learning paths.     

Flame and silane treatments for improving the adhesive bonding characteristics of aramid/epoxy composites

A fast and cost-effective surface treatment with flame and silane coupling agent treatments has been developed for the surface treatment of aramid/epoxy composite faces to improve the adhesive bonding characteristics of lightweight sandwich stealth radome structures. The flame treatment was performed with propane gas, and the silane treatment was performed with γ-methacryloxypropyltrimethoxy silane (γ-MPS) and γ-aminopropyltriethoxy silane (γ-APS) under different treatment conditions. The contact angles of the flame-treated aramid/epoxy composites and the single-lap shear strengths of the adhesive joint composed of the aramid/epoxy composite adherend and epoxy adhesive were measured and compared with those treated with argon plasma and mechanical abrasion. In addition, the surfaces were analyzed with atomic force microscopy (AFM), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) to characterize the mechanical and chemical interactions of the aramid/epoxy composite with the epoxy adhesive.