18世纪晚期市民阶级在德国文化中的自我塑造:《奢侈与时尚期刊》研究

本文通过研究<奢侈与时尚期刊>来分析18世纪德国市民阶级的自我塑造.它宣扬奢侈品消费加速了经济与社会的发展,也为文化进步和国家民族富裕提供了动力.它主要关注私生活里的文化与社会自身的构建,并帮助市民阶级进行自我塑造且与其他阶级进行区分.它还阐述了时尚与奢侈品消费的重要性与必要性,并驳斥了神学与道学将时尚视为虚荣及道德缺陷的偏见.它认为作为文化差异的一部分,服装特色的区分成为一种衡量人民与国家成熟与否的标尺.时尚发挥了视觉艺术的功能,甚至于也是一种行为艺术.此外,时尚还与身体复杂地联系在一起,两者缺一不可.     

二维条形码在机关公文管理中的应用

办公自动化系统的发展和应用,对于政府转变职能,提高办公效率起到了举足轻重的作用,但是在实际应用过程中也碰到了很多问题,其中之一就是对公文的管理。传统办公自动化系统的目标是实现办公全过程的＂无纸化＂,即把纸质文件转化为电子文件进行流转。但在目前国情下,要一步实现无纸化办公,还面临很多困难,因此政府机关不得不将纸质文件流和电子文件流并行运行,从而导致需要分发交换的纸质文件和文件的电子信息脱节。通过将条码技术引入到公文管理中,生成含有文件信息的二维条码,从而实现纸质文件和文件的电子信息完全同步。     

电容器引线焊接机冲压切边凸轮的三维精确造型

根据电容器引线焊接机冲压切边模具中的凸轮设计要求,利用Pro/ENGINEER软件找出凸轮随动件滚子中心的轨迹,通过可变截面扫描间接得到凸轮的三维精确模型。为类似零件的建模提供一种行之有效的方法,并为后续的仿真分析和制造加工提供一种依据。     

Robust sparse principal component analysis

The model for improving the robustness of sparse principal component analysis（PCA） is proposed in this paper. Instead of the l2-norm variance utilized in the conventional sparse PCA model,the proposed model maximizes the l1-norm variance,which is less sensitive to noise and outlier. To ensure sparsity,lp-norm（0 p 1） constraint,which is more general and effective than l1-norm,is considered. A simple yet efficient algorithm is developed against the proposed model. The complexity of the algorithm approximately linearly increases with both of the size and the dimensionality of the given data,which is comparable to or better than the current sparse PCA methods. The proposed algorithm is also proved to converge to a reasonable local optimum of the model. The efficiency and robustness of the algorithm is verified by a series of experiments on both synthetic and digit number image data.     

换热管直径对换热器(火用)效率影响的探讨

本文通过换热管直径对换热器(火用)效率影响的分析,提出了换热器设计及改造时,减小(火用)损失的一条途径.     

窄带滤光片光学极值法直接监控的光学设计

窄带滤光片是应用于光谱学、激光、天文物理学、通信等各个领域的光学组件,精确控制每一层膜厚是制备滤光片的困难所在.采用光学极值法直接监控工件,可以同时制备多件滤光片.设计了监控光路和信号获得电路,通过探测到的测试信号,监控薄膜膜厚,实现了直接监控.     

Weathering modification of acrylic emulsion by introducing UV absorbing groups

A new kind of UV-absorbing silicon-fluorinated acrylic emulsion was prepared by emulsion polymerization with 4-allyloxy-2-hydroxybenzophenone, 3-methacryloxypropyltrimethoxysilane (MPS) and hexafluorobutyl methacrylate (HFMA) as functional monomers. The emulsion and its coating were characterized by transmission electron microscope, Fourier transform infrared spectrum (FTIR), X-ray photoelectron spectroscopy, ultraviolet absorption spectrum,thermo-gravimetric analysis, water contact angle (CA), and artificial accelerated aging test. The results indicated that the emulsion with core-shell structure was synthesized and showed prominent absorption peaks at 320 and 350 nm. The water CA of the coating was increased from 70.2° to 86.7° because of the incorporated HFMAs and MPSs. Both of the initial and final decomposition temperatures of the coating were increased by more than 20°C compared with those of the unmodified coating. After 10 days of accelerated aging, the color difference (ΔE) and rate of loss of gloss (ΔG) were only 2.78% and 5.22%, while those of the unmodified coating were as high as 22.94% and 78.57%, respectively. Because of the UV absorbers were incorporated by chemical reaction, the new coating had a more durable and effective anti-ultraviolet performance compared with the coatings the UV absorbers were introduced by physical blending.     

基于嵌入式的电网自动调度信息分级采集系统设计

传统系统在电网调度信息采集的过程中,未对其进行分级,导致系统采集数据误差较大,准确度较低.为了提高电网自动调度信息分级采集能力,提出基于嵌入式的电网自动调度信息分级采集系统.构建电网自动调度信息的大数据挖掘模型,结合嵌入式调度方法,实现电网自动调度信息分级采集和优化检索.仿真结果表明,电网自动调度信息分集采集的准确度较高,自适应性较好,具有一定可行性,数据准确性满足系统设计需要,达到实用效果.     

TiCp/Al预制块在Mg中熔化过程研究

将TiCp／Al预制块以不同的工艺加入到Mg液中进行熔化试验。结果表明，未搅拌时TiCp／Al预制块在800℃的Mg液中保温60min后仍不熔化，采用合适的搅拌工艺可使TiCp／Al预制块熔化，并且使TiC粒子在熔体中均匀分布。TiCp／Al预制块在Mg液中的熔化过程机理为：基体Al通过熔化和对淹扩散进入到Mg液中，TiC粒子间的结合力需通过搅拌产生的剪切力才能破坏，并随Mg液流动进入到Mg液中，机械搅拌可使TiC粒子Mg液中均匀分布。     

蠕墨铸铁的优势和技术关键

介绍了蠕墨铸铁的优势和生产中的几个技术关键问题。