油页岩渣超轻陶粒的研制

以桦甸市示范电厂油页岩渣为主要原料,用新的烧胀试验方法开展了超轻陶粒的研制,采用自制的新试验装置,烧制出的陶粒接近实际回转窑水平,并可专门烧制小颗粒陶砂,可比现在烧胀试验方法工作效率提高约50倍;并以国产陶粒设备,提出拟建年产20万m3陶粒工厂工艺方案设计,对窑炉两端的余热利用提出了可行方案.油页岩渣SiO2,Al2O3,R2O含量适中,特别是含碳非常小,可以人为地调整发泡剂的用量而控制陶粒的密度,使在1030～1100℃范围内烧制出300～500级陶粒或陶砂.     

球磨时间对钛酸钡介电性能的影响

通过改变混料的秩序以及采用沉降、水煮损耗、温度特性、电导率和化学分析等测试手段，研究了制备钛酸钡的球磨工艺中球磨时间对钛酸钡粉体均匀性及钛酸钡介电性能的影响。研究结果表明：采用不同的球磨时间制得的钛酸钡性能差别较大，球磨时间达12小时时，能减少球磨引起的团聚，极大地改善了固相合成BaTiO3粉体均匀性，并最终提高了钛酸钡的介电性能。     

“2016·7”清江流域洪水调度方案分析

2016年7月,清江流域发生了特大洪水,湖北省防汛抗旱指挥部认真研究、贯彻、落实防洪决策部署,把保障人民群众生命财产安全放在首位,反应迅速、调度灵活。经过对汛情进行研究分析,制定出了相应的措施,即采取预泄腾库迎洪、汛中错峰拦洪、汛末适时收水等,取得了清江特大洪水防御的阶段性胜利。对"2016·7"清江洪水调度方案及措施的制定、落实情况进行了总结分析,可为今后清江流域防洪调度工作提供借鉴与参考。     

氮三甲撑膦酸中氯离子含量测定方法的研究

在酸性条件下,用Ag~ 沉淀氮三甲撑膦酸溶液中的Cl~-,然后以淀粉和KIO_3为指示剂,用标准I~-溶液滴定过量的Ag~ 。测定准确,方法灵敏,可靠和方便。克服了莫尔法和佛尔哈德法不适用于该测定体系的困难。     

动态网络中行业因素与股市波动性研究

股票市场的波动性一直是金融领域的一个研究重点,行业因素对股市波动性的影响也是投资者关注的一个焦点.从复杂网络视角出发,以行业内股票相关性强弱(RIL)为指标实证研究了行业因素与股票波动性之间的联系.研究发现不同行业的RIL指标有不同的参考标准,于是对原有的RIL指标进行了改进得到新指标RIL*.在以沪深300样本股为例的实证研究中发现采矿业、金融业和房地产业内的股票受行业因素影响最强.研究还发现股票网络结构变化和股市波动性之间存在联系,当行业因素影响急剧降低时,行业内的股票走势会猛烈上升或下降.     

Removal behavior and mechanism of silver from low concentration wastewater using cellulose aerogel modified by thiosemicarbazide

Due to the low concentration of silver in water, most of the cellulose adsorbents exhibited low removal efficiency, which greatly limited their practical applications. Herein, a cellulose aerogel modified by thiosemicarbamide (CAT) was fabricated for reducing and adsorbing silver ions from low concentration wastewater. The characterization results concluded that CAT owned a three-dimensional spongy structure with many circular microspheres and a better specific surface area (19.37 m² g⁻¹), as well as the functional groups of ─C═N⁺─H and ─(C═S)─N. The static batch adsorption experiments demonstrated that CAT could reached the maximum removal percentage of 94.94% and adsorption capacity of 42.12 mg g⁻¹ under the initial concentration of Ag(I) was 15 mg L⁻¹ and the pH value was 7. Meanwhile, the adsorption of Ag(I) on CAT was second-order reaction, and the Langmuir model could better fit the adsorption process. In addition, CAT exhibited wide pH values (1–9) adaptability and excellent adsorption performance for silver through electrostatic interaction, chelation, and reduction. This study probably provides a new method as well as important experimental data and theoretical reference for the removal of silver ions and other metals.     

模铸中碳钢偏析的改善

简要介绍和分析了宝钢集团五钢公司改善模铸中碳钢头部碳偏析程度的技术措施。     

基于藏语字性标注的词性预测研究

该文选取了藏语文中小学教材的部分语料,构建了带有藏语字性标记、词边界标记和词性标记的语料库,通过比较不同的分词、标注方法,证明分词、词性标注一体化效果比分步进行的效果好,准确率、召回率和F值分别提高了0.067、0.073和0.07。但词级标注模型难以解决词边界划分的一致性和未登录词的问题。基于此,作者提出可以利用字性和字构词的规律预测合成词的词性,既可以融入语言学知识又可以减少由未登录词导致的标注错误,实验结果证明,作为词性标注的后处理模块,基于字性标注的词性预测准确率提高到了0.916,这个结果已经比分词标注一体化结果好,说明字性标注对纠正词性错误标注有明显的效果。
     

A yield-enhanced global optimization methodology for analog circuit based on extreme value theory

The challenge in variation-aware circuit optimization with consideration of yield is the trade-off between optimized performance, yield and optimization runtime. This paper presents a practical variationaware circuit global optimization framework named GOYE, which shows the advantages on performance, yield and runtime. It uses an approach called constraint violation elimination (CVE) in global search phase to prune initial starting points and uses the gradient-based method in local search to locate optimum. The worst-case analysis (WCA), which is necessary for variation-aware circuit optimization, is nested in the local optimization process. The efficiency is significantly improved by a novel method based on extreme value theory (EVT). Our EVT-based method is also the first one that allows users to control the target yield such that under-design or over-design can be avoided. A design example in TSMC 65 nm technology is illustrated in the paper where all performance achieves three-sigma yield with consideration of environmental and inter-die/intra-die process variations.     

智能化网络考试监控系统开发

近年来随着高等教育事业的快速发展,为了节约教育成本、提高教学质量和教育的信息化程度,网络化、无纸化考试在高校得到了快速推广。但由于计算机网络是一个开放的系统,考试中电子文档资料可以十分隐秘地被复制和在学生间传递,造成很多严重的作弊行为。如何防范当前网络考试中考生的作弊行为及保障考试结果的公平性成为了急需解决的重要问题。本论文所开发的智能化网络考试监控系统克服了现有考试监控系统的不足,将各种网络考试实时监控信息机地结合在一起,实现了作弊行为检测、作弊行为发现及作弊行为报警三位一体的立体化管理。同时,所开发的网络考试监控系统独立于现有各网络考试系统,在不影响现有考试系统正常工作的情况下,实现了考试作弊行为的有效监控,使其具有良好的可推广性及可维护性。