检索结果-南通市图书馆

2,2,5,5-四甲基-4-醛基氢化呋喃酮-3与芳香邻二胺的反应——合成二氮七元杂环化合物Ⅰ

在线全文

学校读者我要写书评

暂无评论

化学学报 1963年第4期 295-300页

作者：朱瑞鴻尹承烈北京师范大学化学系有机化学教研室北京师范大学化学系研究生

1,3-二羰基化合物与芳香族邻二胺作用,生成一类含二氮原子的七元杂环,即1,5-苯骈二氮环庚三烯[1,5-benzodiazepine)类化合物。第一个这类化合物,在一九○七年即由Thiele等用1,3-酮、邻苯二胺与酸作用而制得。晚近的研究表明,这类化合物... 详细信息

1,3-二羰基化合物与芳香族邻二胺作用,生成一类含二氮原子的七元杂环,即1,5-苯骈二氮环庚三烯[1,5-benzodiazepine)类化合物。第一个这类化合物,在一九○七年即由Thiele等用1,3-酮、邻苯二胺与酸作用而制得。晚近的研究表明,这类化合物也可由芳香邻二胺与与α,β-不饱和醛或酮;α,β-不饱和酸或β-卤代酸;酮酸酯以及硝基丙二醛等反应而制得。

关键词：四甲基所得醛基羰基氢化七元杂环化合物熔点熔解温度缩合产物二氮酒精乙醇邻苯二胺反应邻二

On Locating Malicious Code in Piggybacked Android Apps

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer Science & Technology 2017年第6期32卷 1108-1124页

作者： Li Li Daoyuan Li Tegawende f. Bissyande Jacques Klein Haipeng Cai David Lo Yves Le Traon Interdisciplinary Centre for Security Reliability and Trust University of Luxembourg Luxembourg 2721 Luxembourg School of Electrical Engineering and Computer Science Washington State University Washington WA 99163 U.S.A. School of Information Systems Singapore Management University Singapore 178902 Singapore

To devise efficient approaches and tools for detecting malicious packages in the Android ecosystem, researchers are increasingly required to have a deep understanding of malware. There is thus a need to provide a framework for dissecting malware and locating malicious program fragments within app code in order to build a comprehensive dataset of malicious samples. Towards addressing this need, we propose in this work a tool-based approach called HookRanker, which provides ranked lists of potentially malicious packages based on the way malware behaviour code is triggered. With experiments on a ground truth of piggybacked apps, we are able to automatically locate the malicious packages from piggybacked Android apps with an accuracy@5 of 83.6% for such packages that are triggered through method invocations and an accuracy@5 of 82.2% for such packages that are triggered independently.

关键词： Android piggybacked app malicious code HookRanker

Comparative study of different theories on active earth pressure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Central South university 2012年第10期19卷 2933-2939页

作者： S.P.Yap f.A.Salman S.M.Shirazi Department of Civil Engineering Faculty of EngineeringUniversity of MalayaKuala Lumpur 50603Malaysia

Determination of distribution and magnitude of active earth pressure is crucial in retaining wall designs.A number of analytical theories on active earth pressure were ***,there are limited studies on comparison between the *** this work,comparison between the theories with finite element analysis is done using the PLAXIS *** comparative results show that in terms of distribution and magnitude of active earth pressure,RANKINE's theory possesses the highest match to the PLAXIS *** studies were also done to study the responses of active earth pressure distribution to varying *** soil friction angle and wall friction causes decrease in active earth *** contrast,active earth pressure increases with increasing soil unit weight and height of ***'s theory has the highest compatibility to finite element analysis among all theories,and utilization of this theory leads to proficient retaining wall design.

关键词：主动土压力挡土墙设计有限元分析内摩擦角土压力分布分析理论朗肯理论 RANK

在线全文

学校读者我要写书评

暂无评论

少年维某的新烦恼

少年维某的新烦恼

作者： u.·普伦兹多夫(u. Plendorf)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

半圆形凸起与凹陷地形对SH波的散射

哈尔滨工程大学学报 2007年第4期28卷 392-397页

作者：刘殿魁吕晓棠哈尔滨工程大学建筑工程学院黑龙江哈尔滨150001

研究了弹性半空间中半圆形凸起与凹陷相连地形对SH波的散射问题.采用“契合”的方法,在2个区域中分别构造满足边界条件的位移解,通过移动坐标,在“公共边界”上实施“契合”,并同时满足半圆形凹陷表面上应力自由的边界条件,从而建立起... 详细信息

研究了弹性半空间中半圆形凸起与凹陷相连地形对SH波的散射问题.采用“契合”的方法,在2个区域中分别构造满足边界条件的位移解,通过移动坐标,在“公共边界”上实施“契合”,并同时满足半圆形凹陷表面上应力自由的边界条件,从而建立起求解该问题的无穷代数方程组.计算的数值结果表明凹陷的存在对半圆形凸起地表位移有明显的影响.

关键词： SH波散射半圆形凸起半圆形凹陷契合移动坐标

Delayed Ionization and Delayed Detachment in Molecules and Clusters

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2009年第2期22卷 162-170页

作者： f. Lépine B. Baguenard B. Concina M. A. Lebeault C. Bordas université de Lyon F-69522 Lyon France université Lyon 1 Villeurbanne CNRS UMR 5579 LASIM

在它的电离阀值上面激动的一个分子的系统的进化取决于包括激动的状态和他们的政变石楠的性质到各种各样的 continua 的很多个参数。管理这进化的过程的一般性质实质上也取决于分子的复杂性，更精确在它的尺寸，状态的密度，和在自由的... 详细信息

在它的电离阀值上面激动的一个分子的系统的进化取决于包括激动的状态和他们的政变石楠的性质到各种各样的 continua 的很多个参数。管理这进化的过程的一般性质实质上也取决于分子的复杂性，更精确在它的尺寸，状态的密度，和在自由的各种各样的内部度之中的政变石楠的力量上。在这篇论文，我们探讨在在发生在更大的分子或簇的小分子，和推迟的电离占优势的自电离之间的转变的问题。这转变被 Na uB>2uB> Rydberg 状态的自电离一方面说明，在 fullerene C uB>60uB>, 推迟了电离并且在另一方面推迟了在小簇阴离子的分开。所有过程在毫微秒激光刺激的情况中被学习，相应于内部精力的相当慢的免职。

关键词：自电离自解离热电子发射分子

Evaluation of dynamic development of grain structure during friction stir welding of pure copper using a quasi in situ method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2019年第7期35卷 1412-1421页

作者： X.C.Liu Y.f.Sun T.Nagira K.ushioda H.fujii Joining and Welding Research Institute Osaka University11-1 MihogaokaIbarakiOsaka567-0047Japan School of Materials Science and Engineering Northwestern Polytechnical UniversityXi'an710072China School of Materials Science and Engineering Zhengzhou UniversityZhengzhou450001China

By employing a quasi in situ method, we investigated the dynamic evolution of the grain structure con-sidering the material flow, strain, and strain rate in the friction stir welding of pure copper. The tool' stop action' and rapid cooling were employed and a brass foil was used as a marker to show the material flow path. The grain structure along the material flow path was characterised using electron backscatter diffraction. Static recrystallization occurs for the work-hardened base material in the preheating stage in front of the tool In the acceleration flow stage, grains are significantly refined by plastic deforma-tion, discontinuous dynamic recrystallization, annealing twinning during the strain-induced boundary migration and slight continuous dynamic recrystallization. In the deceleration flow stage, due to a strain reversal, the grain first coarsens, and is thereafter refined again. finally, the hot-deformed material in the shoulder-affected zone is ‘frozen’ directly whereas that in the probe-affected zone undergoes signif-icant annealing;thus, the recrystallized microstructure and 45°-rotated cube texture are obtained in the probe-affected zone.

关键词： friction stir welding Grain structure Material flow Pure copper EBSD

在线全文

学校读者我要写书评

暂无评论

基于凹陷域分析的电压暂降监测点优化配置

电力自动化设备 2012年第6期32卷 45-50页

作者：吕伟田立军山东大学电气工程学院山东济南250061

提出一种基于凹陷域分析的电压暂降监测点优化配置的新方法,以监测点数目最小为目标函数,以全网敏感性负荷节点电压暂降可观测性为约束条件,利用整数线性规划方法,通过MATLAB编程求取符合要求的最少数目监测点。在构造电压暂降幅值矩阵... 详细信息

提出一种基于凹陷域分析的电压暂降监测点优化配置的新方法,以监测点数目最小为目标函数,以全网敏感性负荷节点电压暂降可观测性为约束条件,利用整数线性规划方法,通过MATLAB编程求取符合要求的最少数目监测点。在构造电压暂降幅值矩阵的计算中,考虑到了每一个节点故障可能引发系统其余节点电压暂降的情况。在IEEE 39节点系统上进行仿真计算,成功求得了保证全网敏感性负荷节点电压暂降可观测的最少数目的监测点。

关键词：电压暂降优化配置整数线性规划冗余度监测

Regulating expressions of cyclin D1,pRb,and anti-cancer effects of deguelin on human Burkitt's lymphoma Daudi cells in vitro

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2005年第7期26卷 873-880页

作者： Hong-li L1u Yan CHEN~2 Guo-hui CuI Qiu-ling Wu Jing HE Department of Hematology,union Hospital,Tongji Medical College,Huazhong university of Science arid Technology,Wuhan 430022,China Department of Hematology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan China

Aim:To investigate anticancer effects and molecular mechanism of deguelin onhuman Burkitt’s lymphoma Daudi cells in vitro and compare the cytotoxicities ofdeguelin on Daudi cells and human peripheral blood monocular cells(PBMC).Methods:The effects of deguelin on the growth of Daudi cells were studied by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2H-tetrazolium(MTT)*** dectected through Hoechst 33258 staining and Annexin V/PI *** effect of deguelin on the cell cycle of Daudi cells were studied bya propidium iodide *** expressions of cyclin D 1 and pRb were checkedby Western ***:The proliferation of Daudi cells were decreased indeguelin-treated group with a 24-h IC50value of 51.55 nmol/*** inducedDaudi cells apoptosis was in a time-and dose-dependent manner.G0/G1phaseincreased and S phase decreased in Daudi cells treated with *** deguelin0,5,10,20,and 40 nmol/L treatment for 24 h,G0/G1phase increased from 37.34% to56.56%,whereas S phase decreased from 37.72% to 21.36%.PBMC was lesssensitive to the cytotoxic effect of deguelin than Daudi *** expression ofcyclin D 1 and pRb protein were decreased sharply in Daudi cells treated ***:Deguelin is able to inhibit the proliferation of Daudi cellsby regulating the cell cycle that arrested cells at G0/G1phase and inducing the ***,deguelin selectively induced apoptosis of Daudi cells withlow toxicity in *** antitumor effects of deguelin were related to down-regulating the expression of cyclin D1 and pRb protein.

关键词： deguelin Daudi cells cyclin D1 pRb apoptosis