基于B/S模式的无纸化考试系统研究

随着计算机软件技术的逐步成熟,无纸化考试系统已经越来越频繁地走进人们的视野,并以其自动化、智能化、科学化等优点逐步取代了传统的卷面笔试的考试方式,是未来发展尤其是计算机类课程改革的必然趋势。文中以安徽农业大学开展的无纸化考试为背景,研究B/S模式下的无纸化考试系统及其实验室的相关准备工作。     

科学级冷却型CCD—荧光图像系统定量性能的鉴定

以荧光探针Ｈｏｅｃｈｓｔ３３３４２（Ｈｏ３３３４２）特异性标记大白鼠精子和肝细胞ＤＮＡ，用科学冷却型ＣＣＤ显微荧光图像系统获取单个细胞的荧光图像，再以图像处理软件“Ｉｍａｇｅ－Ｐｒｏ ＰＬｕｓ”，分析测量各细胞的ＤＮＡ相对含量和细胞核的相对面积。实验数据表明：鼠肝细胞的ＤＮＡ相对含量分别为精子的ＤＮＡ相对含量的２，４，８倍，符合生物学的规律，说明这套系统的定量结果是可靠的。     

Study and Application of Cooperative Work Environment

１ＳｏｍｅＲｅｌａｔｉｖｅＣｏｎｃｅｐｔｓｏｆＣＷＥＩｎｏｒｄｅｒｔｏｄｅｆｉｎｅＣｏｏｐｅｒａｔｉｖｅＷｏｒｋＥｎｖｉｒｏｎｍｅｎｔ（ＣＷＥ），ｗｅｓｈｏｕｌｄｄｅｆｉｎｅＣｏｏｐｅｒａｔｉｖｅＷｏｒｋＳｙｓｔｅｍ（ＣＷＳ）ｆｉｒｓｔ．ＡＣＷＳｉｓ...     

喹啉端基硫醚化合物的合成及其与Cu(Ⅱ)的作用

在润滑油的多效添加剂系列中，有机含硫化合物以其特有的性能得到广泛应用［１］．随着对此类添加剂研究的进一步开发，对含Ｎ杂环的苯酚硫醚化合物发生兴趣［２］，以期改善添加剂的抗氧化和抗腐蚀等性能．本文合成了４个带喹啉配位端基的硫醚化合物（Ｌ１，Ｌ２，Ｌ３，...     

丰满大坝溢流坝段增设排水系统设计研究

以渗流分析和有限元理论为基础，对丰满大坝充坝段为降低下 游面冻融点位置所提出的增设排水系统的若干设计方案进行了可行性研究，结果表明，新增排水廊道，加密排水幕及优化排水孔的合理位置的设计方案均对降低出水点有不同程度的效果，但都不能达到使其淹入下游面以下的目的，其主要原因是由最初的设计方案造成的，该结论对工程实施有显著的指导意义。     

BotGuard: Lightweight real-time botnet detection in software defined networks

The distributed detection of botnets may induce heavy computation and communication costs to network devices. Each device in related scheme only has a regional view of Internet, so it is hard to detect botnet comprehensively. In this paper, we propose a lightweight real-time botnet detection framework called Bot-Guard, which uses the global landscape and flexible configurability of software defined network (SDN) to identify botnets promptly. SDN, as a new network framework, can make centralized control in botnet detection, but there are still some challenges in such detections. We give a convex lens imaging graph (CLI-graph) to depict the topology characteristics of botnet, which allows SDN controller to locate attacks separately and mitigate the burden of network devices. The theoretical and experimental results prove that our scheme is capable of timely botnet detecting in SDNs with the accuracy higher than 90% and the delay less than 56 ms.     

Lagrange方程在振动系统中的应用

介绍了从系统能量的观点出发去分析一个系统,运用Lagrange方程建立结构动力学基本方程,并特别地推导了考虑轴向力的欧拉粱振动模态与系统质量矩阵、刚度矩阵的关系.最后进行了算例分析.     

Degradation of 2,4-dichlorophenol catalyzed by the immobilized laccase with the carrier of FeaO4@MSS-NH2

With the Fe304@MSS （magnetic mesoporous silica spheres）-NH2 as the carrier and the glutaraldehyde as crosslinking agent, the immobilized laccase has been pre- pared and characterized by XRD, IR, SEM and BET etc. Under the optimal conditions, the removal efficiency of 2,4-DCP reached 88 % and the removal efficiency still remained 61.5 % after five cycles of operations. In virtue of GC-MS analysis, 2,5-dimethoxyl-l,4-quinone, 2-chlo- rine-l,4-dimethoxyl benzene, 3,3＇-dichlorine-4,4＇-dimeth- oxyl biphenyl, maleic acid phenol ester, and three kinds of maleic acid, alcohol ester, and para-hydroxyl phenol ester compounds have been identified as intermediate and final degradation products of 2,4-DCP, respectively. Besides, the degradation products of 2,4-DCP have been confirmed by performing the 1H-NMR and 13C-NMR experiments, further demonstrating the degradation mechanism of 2,4- DCP by the immobilized laccase.     

Degradation of 2,4-dichlorophenol catalyzed by the immobilized laccase with the carrier of Fe3O4@MSS–NH2

With the Fe₃O₄@MSS (magnetic mesoporous silica spheres)–NH₂ as the carrier and the glutaraldehyde as crosslinking agent, the immobilized laccase has been prepared and characterized by XRD, IR, SEM and BET etc. Under the optimal conditions, the removal efficiency of 2,4-DCP reached 88 % and the removal efficiency still remained 61.5 % after five cycles of operations. In virtue of GC–MS analysis, 2,5-dimethoxyl-1,4-quinone, 2-chlorine-1,4-dimethoxyl benzene, 3,3′-dichlorine-4,4′-dimethoxyl biphenyl, maleic acid phenol ester, and three kinds of maleic acid, alcohol ester, and para-hydroxyl phenol ester compounds have been identified as intermediate and final degradation products of 2,4-DCP, respectively. Besides, the degradation products of 2,4-DCP have been confirmed by performing the ¹H-NMR and ¹³C-NMR experiments, further demonstrating the degradation mechanism of 2,4-DCP by the immobilized laccase.     

面向21世纪《数学分析》教学改革的实践与认识

分析了高师《数学分析》教学改革的必要性,提出了改革的思路、内容、目标与特色,并对教材、教法改革进行了初步实践与尝试,在此基础上提出了继续改革的设想与打算。