永发水库复建的必要性

就水库的消险和充分利用水资源发展农业生产服务等方面,论述复建永发水库工程的必要性.     

谈三江平原洪涝治理

分析了三江平原地区造成洪水的影响因素及洪水危险程度;提出了防洪减灾措施.     

Photo-Chemically-Deposited and Industrial Cu/ZnO/Al2O3 Catalyst Material Surface Structures During CO2 Hydrogenation to Methanol: EXAFS,XANES and XPS Analyses of Phases After Oxidation,Reduction, and Reaction

Catalysis Letters - Industrial Cu/ZnO/Al2O3 or novel rate catalysts, prepared with a photochemical deposition method, were studied under functional CH3OH synthesis conditions at the set temperature...     

Curcumin and Its New Derivatives: Correlation between Cytotoxicity against Breast Cancer Cell Lines,Degradation of PTP1B Phosphatase and ROS Generation

Breast cancer is the most common cancer of women—it affects more than 2 million women worldwide. PTP1B phosphatase can be one of the possible targets for new drugs in breast cancer therapy. In this paper, we present new curcumin derivatives featuring a 4-piperidone ring as PTP1B inhibitors and ROS inducers. We performed cytotoxicity analysis for twelve curcumin derivatives against breast cancer MCF-7 and MDA-MB-231 cell lines and the human keratinocyte HaCaT cell line. Furthermore, because curcumin is a known antioxidant, we assessed antioxidant effects in its derivatives. For the most potent cytotoxic compounds, we determined intracellular ROS and PTP1B phosphatase levels. Moreover, for curcumin and its derivatives, we performed real-time microscopy to observe the photosensitizing effect. Finally, computational analysis was performed for the curcumin derivatives with an inhibitory effect against PTP1B phosphatase to assess the potential binding mode of new inhibitors within the allosteric site of the enzyme. We observed that two tested compounds are better anticancer agents than curcumin. Moreover, we suggest that blocking the -OH group in phenolic compounds causes an increase in the cytotoxicity effect, even at a low concentration. Furthermore, due to this modification, a higher level of ROS is induced, which correlates with a lower level of PTP1B.     

福建沿海地区偷渡现象探析

福建沿海地区的偷渡现象集中于长乐、福清、平潭、连江等地，各地偷渡客尽管在去向上“各成一路”，但在偷渡的成因、方式、造成的社会问题等方面，其共性显现无遗，共同促成了福建沿海地区独特的偷渡文化。偷渡现象客观上为沿海各地缓解就业压力，增加经济收入提供了一条途径，亦导致当地经济社会畸形发展，引发诸多社会问题，渐成恶性循环之势。从治本计，针对福建沿海地区偷渡问题，一方面应继续保持高压，加强打击，内外联系，构建高效协作机制，另一方面，更应立足疏导，努力优化当地发展环境，缓解就业压力，拓展创业空间。     

可控特征点对以及RANSAC的监视系统外参估算方法

为了提高基于机器视觉的监控系统的精度,立体视觉信息作为一种鲁棒性很高的参数被引入监控算法中.立体视觉信息的引入使得外参求解成为影响监控结果的一个重要环节.现存的应用于监视系统的外参自动估算方法均采用立体视觉中外参求解的方法.这些方法普遍存在特征点的数目完全由场景决定特点.为了解决在大部分监视系统应用的场景中,因为背景较为空旷、基线较长同时相机对之间的旋转量较大,由场景提供的特征点数量非常有限,导致计算结果并不理想这一问题,提出了一种基于视频序列的RANSAC外参求解方法.该方法不仅利用RANSAC算法有效的剔除外点,而且根据可控特征点对的动态性,利用时间上的积累获得了充足的位置可控、数量可控的可控特征点对,并据此得到精度较高的外参结果.根据实验,该方法可以将三维重建误差降低近50%.     

信息技术在多校区大学校园管理中的应用

通过分析在多校区大学校园管理工作中应用信息技术的必要性 ,探讨了基于GIS的校园设施管理系统的可行性 ,介绍了系统的基本内容、系统功能和系统数据结构设计等     

Prediction-based guidance algorithm for high-lift reentry vehicles

In this work, we propose a pseudo four-degrees-of-freedom (DOF) prediction based guidance algo- rithm specifically for high-lift reentry vehicles. The algorithm is composed mainly of three parts. First, at the beginning of each guidance cycle, the 4-DOF predictor is called upon to predict the final downrange, crossrange, and heading errors. Then, the magnitude of the bank angle is determined from the downrange error, using the proportional-integral (PI) control method. Finally, two bank angle reversal time ...     

对高校教材建设的几点看法——由《网页设计与制作教程》一书热销引发的思考

本文通过分析目前高校教材建设存在的一些问题以及笔者编著的《网页设计与制作教程》一书热销的原因,给出了笔者对高校教材建设的一些个人看法,供大家借鉴和思考。     

粉末——粘结剂两相流模型的碰撞分析与计算机模拟

分析了粉末注射成形中粉末—粘结剂两相流动中粒子(颗粒与分子)碰撞的情况。假设粉末颗粒完全由粘结剂包裹,在成形阶段将粉末颗粒视为非完全弹性体,给出了粉末—粘结剂两相流动模型中碰撞项的碰撞模式,简化了粉末—粘结剂固液两相流动模型的一般方程。为进一步对粉末—粘结剂两相流动进行计算机数值模拟和分析粉末—粘结剂两相分离现象奠定了理论基础。