液体硝酸铵灌装装置运行总结

随着科学技术的发展进步,采用液体硝酸铵代替固体硝酸铵制备工业炸药,是行业跨越生产技术重点发展的方向之一。本文分析了液体硝酸铵灌装装置的工艺流程、运行效益、存在的问题,并提出相应的整改措施,使装置的稳定性有了很大提高。     

中心对称本原矩阵本原指数的缺数段

对中心对称本原矩阵的本原指数的缺数段进行了完整的刻画．得到的主要结论是：n阶最小奇圈长为d的中心对称本原矩阵，其本原指数的缺数段为{n-（d-3）／2，n-2}．     

C*-代数上部分矩阵的酉补

利用分块矩阵的方法,讨论C*-代数上部分矩阵的酉补问题.     

矩阵的字典式积的特征根与特征向量

讨论了方阵A与B的字典式积的行列式、特征根和特征向量与方阵A、B的行列式、特征根和特向量之间的关系；证明了A与B的字典式积可逆的充要条件是A与B均可逆。并给出了求其逆矩阵的一种算法．     

基于纹理特征的一种图像检索方法的实现

提出了一种基于纹理特征的“区域－图像”的检索方法，该方法包括两种基本的技术：一是利用共生矩阵提取六种不同的纹理特征；二是利用归一化相关的方法进行纹理特征向量的相似性度量。通过实验，证明了该方法可以产生比较满意的检索结果。     

CSSCI来源期刊微信公众平台运营现状及优化策略

【目的】了解CSSCI来源期刊微信公众平台现状,为科技期刊运营微信公众平台提供参考。【方法】以533种CSSCI（2014—2015）来源期刊为样本,采用普查法获取其微信公众平台的开通及运营状况,调研截止到2016年1月15日。【结果】164种期刊开通了微信公众平台,开通率仅有30.77%;出现一些亮点,如多种媒介联通互动,提供多种增值服务,分层、分类推送消息等;整体运营现状不佳,存在数字化思维淡泊、运营思维缺乏、用户服务意识匮乏等问题。【结论】学术期刊要加快与新媒体的融合,对此,全面树立用户观念,加快平台与多种新媒体融合,以期刊为基础、聚焦内容、凸显办刊特征,加大硬件与软件的双重技术投入。     

African American Educators’ Perspectives on the Advanced Placement Opportunity Gap

This study examines perspectives of educators on the advanced placement opportunity gap for African American students. Using interviews with 11 educators from 10 high schools, we explored their perceptions regarding the impact of a local academic achievement program on the enrollment of African American students in honors and advanced placement courses. Results of the analysis suggest that there is a perceived and real gap in the participation of African American students in AP courses. Findings also revealed that educators were concerned about the lack of access for African American students to AP courses. Further, issues of belonging and operational citizenship within the school environment were raised. Recommendations for pedagogical techniques are presented as well as suggestions for future research. Jocelyn D. Taliaferro is an Assistant Professor in the Department of Social Work at North Carolina State University. Dr. Taliaferro earned her BA degree in Psychology with minors in African American Studies and English from University of Delaware and her MSW from Howard University in Washington, D.C. She returned to University of Delaware to earn her PhD in Urban Affairs and Public Policy. Dr. Taliaferro’s teaching and research interests include African American student achievement, social policy, community development, and family support. Jessica T. DeCuir-Gunby is an Assistant Professor of Educational Psychology in the Department of Curriculum & Instruction at North Carolina State University, CB#7801, Raleigh, NC, 27695, USA. Dr. DeCuir-Gunby earned her BS degree with a double major in Psychology and Spanish from Louisiana State University. She earned both her MA and PhD degrees in Educational Psychology at the University of Georgia. Dr. DeCuir-Gunby’s research and theoretical interests include race and racial identity development in education, Critical Race Theory, mixed methods research, and emotions.     

Hankel矩阵求逆与相乘的一种快速算法

不通过特征值的计算,直接给出了n阶Hankel矩阵求逆与相乘的一种快速算法,推广了现有的结果。若用FFT计算,其计算复杂性为O(log2n)。     

我国住房公积金管理运作模式评析及其发展方向探索

在我国现行住房公积金制度的基础上,本文从治理结构和运作模式两个方面探讨了住房公积金管理运作模式的现状和发展方向,提出通过重新定位公积金管理中心和招标选择委托银行以优化住房公积金治理结构,从逐渐转换归集模式、有效拓展使用途径、合理优化增值收益分配方式三个方面促进住房公积金制度良性运作,并给予了相关的政策建议.     

可换环上严格上三角矩阵李代数的拟导子

设R是含幺可换环,Nn（R）表示R上的所有n×n严格上三角矩阵组成的李代数,对Nn（R）上的一个线性变换φ,若存在Nn（R）上的一个线性变换φ,对任意的x,y∈Nn（R）都有[φ（x）,y]＋[x,φ（y）]=φ（[x,y]）,则称φ为Nn（R）上的拟导子.本文定出了Nn（R）上的任一拟导子的具体形式,并对导子的概念进行了推广.