检索结果-南通市图书馆

A Facile Stereospecific Synthesis of 1, 3-Enynylsulfides via Sonogashira Coupling of （E）-a-Iodovinyl Sulfides with 1-Alkynes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第6期17卷 757-760页

作者： jian Wen jiang Ming zhong CAI Department of Chemistry Jiangxi Normal University Nanchang 330027

（E）-α-Iodovinyl sulfides 1 underwent the Sonogashira coupling reactions with terminal alkynes 2 in piperidine at room temperature in the presence of 5 mol % of Pd（PPh3）4 and 10 mol % of CuI to afford the correspo... 详细信息

关键词： (E)-α-Iodovinyl sulfide 1 3-enynylsulfide Sonogashira coupling terminal alkyne.

A facile stereospecific synthesis of (Z)-2-sulfonyl-substituted 1,3-enynes via Sonogashira coupling of (E)-α-iodovinyl sulfones with 1-alkynes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第7期18卷 773-776页

作者： Wen Yan Hao jian Wen jiang Ming zhong Cai Department of Chemistry Jiangxi Normal University Nanchang 330022 China

（E）-α-Iodovinyl sulfones 1 underwent the Sonogashira coupling reactions with terminal alkynes 2 in piperidine at room temperature in the presence of 5 mol% of Pd（PPh3）4 and 10 mol% of CuI to stereospecifically af... 详细信息

关键词： (E)-α-Iodovinyl sulfone 1,3-Enynylsulfone Sonogashira coupling Terminal alkyne

A new sesquiterpene from hairy root culture of Artemisia annua

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2010年第5期21卷 590-592页

作者： Dan Dan Zhai[a], Hui Zi Jin[b] jian jiang zhong[a][c] [a] State Key Laboratory of Bioreactor Engineering School of Biotechnology East China University of Science Technology Shanghai 200237 China [b] School of Pharmacy Shanghai Jiaotong University Shanghai 200240 China [c] Key Laboratory of Microbial Metabolism Ministry of Education School of Life Sciences & Biotechnology Shanghai Jiaotong University Shanghai 200240 China

A new sesquiterpene（Z）-7-acetoxy-methyl-11-methyl-3-methylenedodeca-1,6,10-triene（AMDT） was isolnted and identified from the methanol extract of the hairy root culture of Artemisia *** structure of AMDT was determined based on the analysis of spectroscopic data,notably of the 2D NMR *** new compound showed cytotoxicity against human tumor cell lines 95-D and HeLa with IC50 values of 27.08 and 20.12μmol/L,respectively.

关键词： Artemisia annua Sesquiterpene Cytotoxicity

Direct Modeling of Induction Motors with Skewed Rotor Slots Using 2-D Multi-Slice Model and Time Stepping FEM

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2000年第2期4卷 133-139页

作者： FU Wei nong jiang jian zhong School of Electromechanical Engineering and Automation Shanghai UniversityShanghai 200072China

The geometrical feature of the skewed rotor slots in induction motors makes the 2 dimensional (2 D) finite element method (FEM) not directly applicable. Based on the multi slice model in this paper, a time stepping 2 D eddy current FEM is described to study the steady state operation and the starting process of induction machines with skewed rotor slots. The fields of the multi slices are solved in parallel, and thus the effects of skewed slots and eddy current can be taken into account directly. The basic formulas for the multi slice model are derived. Special technique to reduce computation time in solving the coupled system equations is also described. The results obtained by using the program developed have very good correlation with the test data.

关键词： induction motors finite element method

Unified Field Equation Generated by Longitudinal Electromagnetic (LEM) Waves

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2024年第5期13卷 181-191页

作者： jiang jian-zhong Zhang Xiang-qian Mechanical School of Engineering Jiangnan UniversityWuxi 214122China Independent Researcher No.111 Erlong New StreetTongda TownLujiang CountyAnhui 231533China

According to special relativity,the relationship of electromagnetic conversion in a linear moving vacuum and the relationship formula between the magnetic vector potential/scalar potential and the LEM(Longitudinal Electromagnetic)waves,it is inferred that the spherical vacuum space we are in undergoes outward helical motion at the speed of light following the right-hand screw rule,accompanied by a radial space expansion motion far less than the speed of *** on this space basis,we derive a unified field equation indicating that the gravitational field might be equivalent to the acceleration field of the radial expansion motion of our vacuum space,the strong nuclear force field presumably is generated by the light-rotation angular velocity of our space,the weak nuclear force field is most probably produced by its radial expansion motion and the electromagnetic field is undoubtedly produced by the radial linear motion of our space at the speed of *** have also demonstrated both theoretically and experimentally that the LEM waves can generate artificial gravitational fields,and the LEM waves are the material basis of the unified field ***,on Earth,time is the result of the relativistic length contraction effect caused by the radial space expansion speed,which leads to the rate of change of distance in the radial dimension on the unit radial space expansion ***,based on the length contraction effect in special relativity,the time and space generated by the outward helical motion of space at the speed of light can be expressed as *** indicates that such motion not only does not affect the seemingly perpetually stationary space that we can constantly perceive but also enables the gravitational field formula to remain unchanged in our *** constitute the spatio-temporal basis of the unified field *** on our unified field theory,we have also discussed some forward-looking perspectives,such as motion at the speed of

关键词： QED(quantum electrodynamics) LEM wave electromagnetic induction unified field equation artificial gravitation field.

新型反应型阻燃剂中间体DOPO的合成工艺改进

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

南京理工大学学报 2005年第6期29卷 716-719页

作者：蒋建中蔡春南京理工大学化工学院江苏南京210094

以三氯化磷和邻苯基苯酚在ZnCl2催化下合成新型阻燃剂中间体9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)。该文首先合成DOPO-2′-羟基联苯基-2-次磷酸(HPPA)混合物,然后在甲苯介质中将混合物脱水转化为高纯度DOPO。考察了催化剂种类、... 详细信息

以三氯化磷和邻苯基苯酚在ZnCl2催化下合成新型阻燃剂中间体9,10-二氢-9-氧杂-10-磷杂菲-10-氧化物(DOPO)。该文首先合成DOPO-2′-羟基联苯基-2-次磷酸(HPPA)混合物,然后在甲苯介质中将混合物脱水转化为高纯度DOPO。考察了催化剂种类、催化剂用量、物料配比、反应温度、反应时间等对收率的影响,并用正交实验进行了条件优化,优化条件为:物料配比n(OPP)n(PCl3)=1 1.7,反应温度220℃;反应时间3 h;ZnCl2的质量分数为0.1%。在该优化条件下DOPO收率96.2%。

关键词：阻燃剂合成脱水正交实验

Collaborative work model based on peer-to-peer network

在线全文

学校读者我要写书评

暂无评论

Journal of Chongqing University 2007年第2期6卷 130-134页

作者： jiang jian-zhong FU Li ZHANG Xuan-peng XU Chuan-yun College of Software Engineering Chonqing University Chongqing 400044 P.R.China

In this paper, we incorporated peer-to-peer (P2P) concept with agent technology and put forward a collaborative work model based on peer-to-peer network (P2PCWM) after investigating into business demands of modern enterprises and problems prevailing in mainstream collaborative work systems based on central server. Theoretically, the P2PCWM can effectively overcome the problems in a conventional system with a central server and meet the practical demands of modern businesses. It is distinguished from other systems by its features of equality, openness, promptness, fairness, expandability and convenience.

关键词： modern team collaboration agent peer-to-peer dynamic project network

在线全文

学校读者我要写书评

暂无评论

陈独秀拒赴莫斯科再评价

北方论丛 2010年第5期 84-87页

作者：姜建中哈尔滨师范大学社会与历史学院教授黑龙江哈尔滨150025

陈独秀政治生涯和莫斯科有着密切关系,中国近现代史和中共党史上提到他三次拒绝去莫斯科。通过对俄罗斯解密档案和其他资料的研究可知,中共五大前后,国际代表也多次提出让陈独秀去莫斯科,最早提出陈独秀赴莫斯科是远东局;以往研究者只... 详细信息

陈独秀政治生涯和莫斯科有着密切关系,中国近现代史和中共党史上提到他三次拒绝去莫斯科。通过对俄罗斯解密档案和其他资料的研究可知,中共五大前后,国际代表也多次提出让陈独秀去莫斯科,最早提出陈独秀赴莫斯科是远东局;以往研究者只注意到陈独秀几次拒绝赴莫斯科,却没有注意到共产国际和联共(布)拒绝他赴莫斯科;中共中央把陈独秀拒赴莫斯科作为开除其党籍的理由是不合适的,共产国际根本没有召开过审议陈独秀被开除党籍的会议。

关键词：陈独秀莫斯科远东局共产国际

在线全文

学校读者我要写书评

暂无评论

清代官箴中的“清廉”之道

杭州师范大学学报（社会科学版） 2021年第6期43卷 102-106页

作者：姜建忠杭州师范大学学校办公室浙江杭州311121

清代官箴是彼时为政官吏的宦海指南和行为规范,其中对为官者提出了颇多道德要求,而"清廉"一端是其再三申述的政治伦理。如何做到官员的清廉,清代官箴提出了许多切实可行的途径:力倡清廉思想,营造风清气正的官场氛围,如倡导节俭,抵制贪渎... 详细信息

清代官箴是彼时为政官吏的宦海指南和行为规范,其中对为官者提出了颇多道德要求,而"清廉"一端是其再三申述的政治伦理。如何做到官员的清廉,清代官箴提出了许多切实可行的途径:力倡清廉思想,营造风清气正的官场氛围,如倡导节俭,抵制贪渎,反对奢靡;极力培养与清廉相关的官德修养,如仁慈爱民、秉公去私、戒骄戒怠、慎独自律等;主张在处理政务和人际关系中要注意践行清廉智慧,无论是对待上级、同僚、下属,抑或家属,都能时刻保持清廉的观念与行为。清代官箴中的清廉之道对于当今反腐戒贪不无警示作用。

关键词：清代官箴清廉反腐戒贪