印刷质量控制的基本方法(一)综述

无论哪一种印刷品的生产都要经过若干个工艺过程，才能将原稿上的图文信息转移到承印物上。由于印刷技术的飞跃发展，标准化和质量控制成为一个很重要的问题。标准化和质量控制在很大程度上是依靠仪器和控制装置来实现的。科学技术的极大发展，大大地推动了印刷技术的发展，印刷所使用的原材料和工艺得到了很大的改进，逐步实现了标准化，提高并稳定了生产高质量产品的能力。目前我们评价印刷品质量的优劣大致有三种方法：主观评价法、客观评价法和综合评价法。主观评价法，是以原稿为基础对照样张来评价。这里有人为的因素，根据评价人的知…     

国产延迟树脂在腈纶溶剂NaSCN除杂装置的应用

叙述了国产的延迟树脂与进口DOWEX-11-A8树脂在腈纶厂NaSCN回收模拟装置上的比较试验,由试验数据可得出;国产的延迟树脂NVI脱除率性能略优于美国DOWEX-11-A8树脂,并可替代DOWEX-11-A8树脂应用于腈纶厂延迟装置中。     

用注凝成型技术制备莫来石陶瓷坯体

用注凝成型技术，通过控制合成莫来石粉料的细度，调节好pH值在单体和交联剂的比例，制备出稳定性好的料浆和强度高的生坯。     

试论电信企业激励机制的改革与创新

本文分析了电信企业面临的社会经济新形势，揭示了在计划经济条件下电信企业内部激励机制存在的弊端，论述了电信企业进行激励机制改革与创新的必要性和必然性，提出了电信企业在生存和发展中改革与创新激励机制的指导思想及原则，提出了如何建立一套科学、合理的激励机制，以便更有效地发挥员工的积极性、主动性和创造性，最大程度地提高激励的效用。     

Preparation and photochromism of nanocomposite thin film based on polyoxometalate and polyethyleneglycol

A photochromic nanocomposite based on Keggin structure phosphomolybdic acid (PMoA) well dispersed in polyethyleneglycol (PEG) was fabricated. TEM image showed that PMoA nanoparticles with narrow size distribution were finely dispersed in polymer matrix. FT-IR results showed that the Keggin geometry of polyoxometalates was still preserved inside the composites and strong coulombic interaction was built between PMoA and polymer matrix. Under UV irradiation, the film was reduced photochemically to yield a blue species, which was in accordance with a charge-transfer mechanism.     

爆震室内混合物填充特性研究

爆震室内混合物的填充过程是PDE工作循环中的重要一环.为了研究爆震室内的燃料和氧化剂的填充特性,采用大型计算流体力学仿真软件对爆震室内燃料和空气的填充过程进行了数值模拟.计算结果表明,在设定的计算条件下,填充距离随填充时间的增加近似线形增大,填充完毕所需的填充时间约0.125s,且从距封闭端250mm开始,填充后的乙炔质量分数稳定在0.11.     

Controlled Synthesis of Ag2S,Ag2Se,and Ag Nanofibers by Using a General Sacrificial Template and Their Application in Electronic Device Fabrication

Nanofiber bundles of Ag₂S, Ag₂Se, and Ag have been successfully synthesized by making use of Ag₂C₂O₄ template nanofiber bundles, utilizing both anion‐exchange and redox reactions. The obtained bundles were polycrystalline nanofibers composed of nanoparticles in which the precursor morphology was well‐preserved, indicating that Ag₂C₂O₄ nanofiber bundles acted as a general sacrificial template for the synthesis of silver‐based semiconductor and metal nanofibers. Dispersing media and transforming reactants were found to be key factors influencing the chemical transformation in the system. In particular, separate single‐crystalline Ag nanofibers were obtained via a nontemplate route when ascorbic acid was used as a relatively weak reductant. An electrical transfer and switching device was built with the obtained Ag₂S and Ag nanofiber bundles, utilizing the unique ion‐conductor nature of Ag₂S and revealing their potential applications in electronics.     

新的启迪

说点心里的话，建筑设计对青年人来讲是一条漫长的道路。建筑是一个载体，有精神一面，也有物质一面。有些建筑师拿着模型或未建成的设计来炒作，为了求名，生怕别人不知道。这对个人是小事，但若贻误了青年学子，那就是不可取的。     

Structured optimal and robust control with multiple criteria: a convex solution

In this paper, the design of controllers that incorporate structural and multiobjective performance requirements is considered. The control structures under study cover nested, chained, hierarchical, delayed interaction and communications, and symmetric systems. Such structures are strongly related to several modern-day and future applications including integrated flight propulsion systems, platoons of vehicles, micro-electro-mechanical systems, networked control, control of networks, production lines and chemical processes. It is shown that the system classes presented have the common feature that all stabilizing controllers can be characterized by convex constraints on the Youla-Kucera parameter. Using this feature, a solution to a general optimal performance problem that incorporates time domain and frequency domain constraints is obtained. A synthesis procedure is provided which at every step yields a feasible controller together with a measure of its performance with respect to the optimal. Convergence to the optimal performance is established. An example of a multinode network congestion control problem is provided that illustrates the effectiveness of the developed methodology.     

High-Tc dc-SQUID magnetometer and its application in eddy current non-destructive evaluation

We have fabricated and tested a high-T_c dc-SQUID magnetometer patterned on a YBCO thin film deposited on a SrTiO₃ bicrystal substrate. The measurement of noise spectrum at 77 K showed that the magnetometer has a white noise of 333 fT/Hz^1/2 without superconducting shield, corresponding to a flux sensitivity of 14.5 μΦ₀/Hz^1/2. We constructed a test system for eddy current non-destructive evaluation of conducting aluminum plates by using the magnetometer. Flaws over 10 mm below the surface can be clearly identified. By mapping the magnetic field distribution, we can locate the flaw position. The signals caused by flaw were expanded due to the use of double-D type driving coil with a wider central slit. The experimental results confirmed that this test system could operate in a magnetic unshielded environment.