汽包水位温压补偿控制系统研究和应用

对汽包双室平衡容器水位温压补偿控制系统进行了探讨和研究,根据温压补偿模型,分析了P L C系统难以独立实现的原因以及查表法的缺陷,提出了P L C系统与上位机系统相结合的水位温压实时连续补偿的综合控制策略,提出并分析比较了三种体系结构及其实现原理和技术,工程应用结果表明该控制系统提高了水位控制的实时性、稳定性、准确性和安全性。     

一种16QAM调制实现技术的研究

讨论了16QAM调制时应用不同类型和参数的滤波器对系统性能的影响．针对16QAM的特点，采用了存储波形累加求和法来代替一般的滤波成形，提高了调制速度．并利用其相位对称的特点将波形存储表压缩为原容量的1／4，有效地节约了存储空间．     

Residual strength prediction of multiple cracked stiffened panels

Prediction of the coalescence of adjacent cracks is critical for residual strength estimation of structures under multiple site damage conditions. A methodology successfully developed for the case of crack link‐up prediction of un‐stiffened plates, is extended for the case of typical cracked stiffened aircraft panels. The proposed link‐up criterion is based on the change in the magnitudes of elastic and plastic strain energies of the stiffened panel, before and after the cracks coalesce. The strain energy magnitudes of interest are calculated using non‐linear elastic–plastic finite‐element analysis. For the application and verification of the method, experimental results from the open literature are used. Residual strength values calculated by the proposed methodology are in good agreement with the experimental results. The present criterion provides superior results when compared to the existing and commonly applied link‐up criteria.     

户用PV系统设计

由于能源短缺和环境污染的问题日益严重,改善能源结构,保护环境,已成为我国在新世纪经济发展高速期所面临的重要课题。尤其是在居住建筑中,采用清洁、储量巨大、无地域限制和能源质量高等诸多优点的太阳能,成为近些年国内研究的热点,引起了各界的关注和重视,科研院所、相关企业等部门都在积极的探索和实践。本文介绍一种户用太阳能光伏发电系统(又称PV系统)的计算流程,仅供参考。     

实验室服务器规划及其安全策略探讨

阐述了实验室教学管理服务器的规划方法,并总结了服务器系统在安装设置和管理中的一些主要安全策略。     

铝电解槽热平衡测试计算中的几点问题

由于缺乏正规的标准，铝电解槽能量平衡测试中存在着一些概念混淆、计算方法和公式错误的情况，应引起测试工作者的注意，在测试计算前应认真制订方案，多查一些参考资料，核实所用公式、数据，避免发生失误。同时对于类似计算，由于计算机的应用，应尽可能采取精确算法。没必要采取一些非常粗糙的近似算法和经验值。     

新风动态负荷与空调节能

介绍利用空调软件对整栋大楼进行动态负荷计算分析,并以此选择空调设备,不但节省投资,而且达到节能效果.     

武钢钢帘线用盘条的发展现状及营销分析

随着中国汽车工业的迅猛发展,子午线轮胎用材钢帘线盘条的需求量日趋扩大,同时市场竞争也更加激烈。利用五力模型(5种竞争力模型)理论对其进行了分析,提出了武钢发展对策。     

企业电子商务盈利策略探析

在比较企业传统营销模式与电子商务模式的基础上,阐明了电子商务的特点,提出了企业运用电子商务进行盈利的策略。为每一个有眼光的企业家,利用电子商务来提高企业在市场中的竞争力和产品的市场占有率,提供相关帮助。     

UV-vis and photoluminescent spectra of TiO<Subscript>2</Subscript> films

TiO₂ fims have been deposited on glass substrates using DC reactive magnetron sputtering at different oxygen partial pressures from 0. 10 Pa.to 0.65 Pa. The transmittance (UV-vis) and photoluminescence (PL) spectra of the films were recorded. The results of the UV-vis spectra show that the deposition rate of the films decreased at oxygen partial pressure P(O₂)≥0.15 Pa, the band gap increased from 3.48 eV to 3.68eV for direct transition and from 3.27 eV to 3.34 eV for indirect transition with increasing the oxygen partial pressure. The PL spectra show convincingly that the transition for films was indirect, and there were some oxygen defect energy levels at the band gap of the films. With increasing the O₂ partial pressure, the defect energy levels decreased. For the films sputtered at 0.35 and 0.65 Pa there were two defect energy levels at 2.63 eV and 2.41 eV, corresponding to 0.72 eV and 0.94 eV below the conduction band for a band gap of 3.35 eV, respectively. For the films sputtered at 0.10 Pa and 0.15 Pa, there was an energy band formed between 3.12 eV and 2.06 eV, corresponding to 0.23 eV and 1.29 eV below the conduction band. ZHAO Qing-nan : Born in 1963 Funded by Natural Science Foundation of Hubei Province, China.