The cycloaddition of N-acyliminium cations with some deactivated alkenes such as α,β-unsaturate ketones and esters has been investigated. In most cases, the N-acyliminium cations produced from 3-hydroxy-2-arylisoind...The cycloaddition of N-acyliminium cations with some deactivated alkenes such as α,β-unsaturate ketones and esters has been investigated. In most cases, the N-acyliminium cations produced from 3-hydroxy-2-arylisoindol-1-ones in the presence of BFa.OEt2 could be reacted with α,β-unsaturated ketones and esters to afford stereoselectively the cycloaddition products 6-acylisoindolo[2,1- a]quinolin-11-ones in moderate to high yields. C 2009 Wei Zhang. Published by Elsevier B.V, on behalf of Chinese Chemical Society. All rights reserved.展开更多
The stereoselective synthesis of 2-chloro-4-substituted-phenyl-5,5-dimethyl-1,3,2-dioxaphosphorinan-2-(thi)ones is described. Only single trans-isomers were obtained when 1-substituted-phenyl-2,2-dimethyl-1,3-propaned...The stereoselective synthesis of 2-chloro-4-substituted-phenyl-5,5-dimethyl-1,3,2-dioxaphosphorinan-2-(thi)ones is described. Only single trans-isomers were obtained when 1-substituted-phenyl-2,2-dimethyl-1,3-propanediols (1) reacted with POCl3. But the stereoselectivity of cyclization reaction between (1) and PSCl3 depended greatly upon the reaction condition. The configurational assignments and the ratio of cis-/trans- diastereoisomers of the products were performed on the basis of (HNMR)-H-1, (PNMR)-P-31 and IR spectra and confirmed by X-ray diffraction analyses.展开更多
Entry into WTO means that Chinese enterprises, which were deeply influenced by planned economy, will scramble for profits with those world famous transnational companies of strong strength. Facing such competitive sit...Entry into WTO means that Chinese enterprises, which were deeply influenced by planned economy, will scramble for profits with those world famous transnational companies of strong strength. Facing such competitive situation, how can China cultivate more famous and strong Chinese transnational companies on the international market? This is a question for many economists and enterprisers to make serious research.展开更多
Psychology is about people’s actions and their thoughts:the ones they know about as well as the ones they don’t know everything about,like when they’re dreaming.Psychologists-people who study psychology-try to unde...Psychology is about people’s actions and their thoughts:the ones they know about as well as the ones they don’t know everything about,like when they’re dreaming.Psychologists-people who study psychology-try to understand different people and groups to help them feel better.展开更多
Thirteen new 2 alkylaminoimidazolones (4) were rapidly synthesized by a new solution phase parallel synthetic method, which includes aza Wittig reaction of iminophosphorane (1) with aromatic isocyanate to give carb...Thirteen new 2 alkylaminoimidazolones (4) were rapidly synthesized by a new solution phase parallel synthetic method, which includes aza Wittig reaction of iminophosphorane (1) with aromatic isocyanate to give carbodi imide (2) and subsequent reaction of 2 with various aliphatic primary amine in a parallel fashion. The products were confirmed by 1H NMR, MS, IR and X ray crystallographic analysis. The unusual selectivity of the cyclization was probably due to the geometry of the guanidine intermediate.展开更多
Using the method of intracellular injection of horseradish peroxidase, the arborizations of several neurones with different functions in the segmental ganglia of the leech Whitmania pigra are investigated. Comparison ...Using the method of intracellular injection of horseradish peroxidase, the arborizations of several neurones with different functions in the segmental ganglia of the leech Whitmania pigra are investigated. Comparison is made in each kind of neurones in order to verify their typical pattern. Results show that the morphology of the axonal arbors of identified neurones has an accurate similarity within and among the individuals of the leech, and the axonal arborizations of the bilaterally identified neurones in the same ganglion have a stable symmetry. The possible reasons of the formation and its functional significance of the symmetrical nervous system are discussed.展开更多
one通常可用来替代上文中出现过的可数名词或以可数名词为中心词的整个名词词组,既可指人,也可指物。例如:The speed of the new machine ismuch greater than that of the oldone.There was an old man and ayoung one there.one的复...one通常可用来替代上文中出现过的可数名词或以可数名词为中心词的整个名词词组,既可指人,也可指物。例如:The speed of the new machine ismuch greater than that of the oldone.There was an old man and ayoung one there.one的复数形式是ones,只能替代复数可数名词,既可指人,也可指物。展开更多
In the early winter of 2017-18,Xie Yuan,vice-president of the Chinese People’s Association for Friendship with Foreign Countries,visited Belgium to award the title of Friendship Ambassador posthumously to Henri Leder...In the early winter of 2017-18,Xie Yuan,vice-president of the Chinese People’s Association for Friendship with Foreign Countries,visited Belgium to award the title of Friendship Ambassador posthumously to Henri Lederhandler,an old associate of the CPAFFC,and presented the Belgium-China Friendship Award to six other Belgians.展开更多
Everyone needs friends.Different people have different ideas about making friends.Some like to make friends with those who are honest and easy to communicate with,some like those who study hard and love sports,and sti...Everyone needs friends.Different people have different ideas about making friends.Some like to make friends with those who are honest and easy to communicate with,some like those who study hard and love sports,and still others like those who are lively,outgoing and ready to help others.展开更多
Origin of Fengshui Woods was studied, 3 representative standpoints (Fengshui doctrines, greening and worship of the god of land) about Fengshui woods were analyzed, and worship of the god of land was believed as a rea...Origin of Fengshui Woods was studied, 3 representative standpoints (Fengshui doctrines, greening and worship of the god of land) about Fengshui woods were analyzed, and worship of the god of land was believed as a reasonable origin view through considering natural and social factors of ancient China, as well as universal mental characteristics of people in the prescience age. To identify advantages and disadvantages of these 3 views, Carl G. Jung' theory of mythological prototype criticism and Sir James George Frazer's anthropological study were borrowed to prove that Fengshui Woods originated from ancient Chinese worship of the god of land, and such worship gradually evolved into practices of planting Fengshui Woods for their propitious signs. On this basis, enlightenment of Fengshui Woods to modern society was disclosed to protect present Fengshui Woods and forest resources.展开更多
The Beijing 2022 Olympic and Paralympic Winter Games, known as the Beijing 2022 Games, took place in Beijing and nearby Zhangjiakou city of Hebei province. The Beijing competition zone undertook all the ice events, th...The Beijing 2022 Olympic and Paralympic Winter Games, known as the Beijing 2022 Games, took place in Beijing and nearby Zhangjiakou city of Hebei province. The Beijing competition zone undertook all the ice events, the Yanqing competition zone was for luge, skeleton, bobsleigh and alpine skiing, and the Zhangjiakou competition zone undertook all the other snow events except the above-mentioned ones.展开更多
In our daily life,we can’t avoid associating with people in the world,so it is important for us to know how to get along with others.In my opinion,to get along with others,we must remember the following advices①.Fir...In our daily life,we can’t avoid associating with people in the world,so it is important for us to know how to get along with others.In my opinion,to get along with others,we must remember the following advices①.First,we need to be honest with others.Telling lies surely makes people stay far away from you.Just as an old saying goes,"Honesty is the best policy."Second,we should be modest enough.If we are proud in public,we can hardly win others②respect.Finally,we shouldn’t be selfish.We should learn to share.展开更多
In view of the vast mountainous areas and abundant mountainous settlement resources of Dali Bai Nationality Autonomous Prefecture, the authors proposed the significance and necessity of studying landscape features of ...In view of the vast mountainous areas and abundant mountainous settlement resources of Dali Bai Nationality Autonomous Prefecture, the authors proposed the significance and necessity of studying landscape features of traditional mountainous settlements of the Bai Nationality by considering policy requirements of "protection system planning of famous historic and cultural cities, towns, villages and blocks in Yunnan Province" and "construction of mountainous towns". On the basis of investigating traditional mountainous settlements of the Bai Nationality in Dali, 5 typical settlements were analyzed from the perspectives of landscape structure, village layout, landscape element, landscape materials and decorative art. And characteristics of traditional mountainous settlements of the Bai Nationality were summarized as "following the nature, adaptive to actual terrains, multidimensional, human-nature oneness".展开更多
Proceeding from the concept of Fengshui, the author focused on the influence of Fengshui on construction activities in ancient China, and proposed that Fengshui has impacted not only site selection and layout of ancie...Proceeding from the concept of Fengshui, the author focused on the influence of Fengshui on construction activities in ancient China, and proposed that Fengshui has impacted not only site selection and layout of ancient cities, towns, villages, palaces and residences, but also site selection and layout of classical Chinese gardens. On this basis, application of Fengshui in modern landscape architecture design was explored, and the harmony between garden planning and environment factors was stressed, and also psychological factors of human beings emphasized. In this way, the doctrine of "human-nature oneness" was demonstrated, spirit of place and actual conditions of the planning site respected, and propitious culture manifested.展开更多
基金the National Natural Science Foundation of China(No.20872056) for financial support.
文摘The cycloaddition of N-acyliminium cations with some deactivated alkenes such as α,β-unsaturate ketones and esters has been investigated. In most cases, the N-acyliminium cations produced from 3-hydroxy-2-arylisoindol-1-ones in the presence of BFa.OEt2 could be reacted with α,β-unsaturated ketones and esters to afford stereoselectively the cycloaddition products 6-acylisoindolo[2,1- a]quinolin-11-ones in moderate to high yields. C 2009 Wei Zhang. Published by Elsevier B.V, on behalf of Chinese Chemical Society. All rights reserved.
文摘The stereoselective synthesis of 2-chloro-4-substituted-phenyl-5,5-dimethyl-1,3,2-dioxaphosphorinan-2-(thi)ones is described. Only single trans-isomers were obtained when 1-substituted-phenyl-2,2-dimethyl-1,3-propanediols (1) reacted with POCl3. But the stereoselectivity of cyclization reaction between (1) and PSCl3 depended greatly upon the reaction condition. The configurational assignments and the ratio of cis-/trans- diastereoisomers of the products were performed on the basis of (HNMR)-H-1, (PNMR)-P-31 and IR spectra and confirmed by X-ray diffraction analyses.
文摘Entry into WTO means that Chinese enterprises, which were deeply influenced by planned economy, will scramble for profits with those world famous transnational companies of strong strength. Facing such competitive situation, how can China cultivate more famous and strong Chinese transnational companies on the international market? This is a question for many economists and enterprisers to make serious research.
文摘Psychology is about people’s actions and their thoughts:the ones they know about as well as the ones they don’t know everything about,like when they’re dreaming.Psychologists-people who study psychology-try to understand different people and groups to help them feel better.
基金ProjectsupportedbytheNationalNaturalScienceFoundationofChina (No .2 0 10 2 0 0 1)
文摘Thirteen new 2 alkylaminoimidazolones (4) were rapidly synthesized by a new solution phase parallel synthetic method, which includes aza Wittig reaction of iminophosphorane (1) with aromatic isocyanate to give carbodi imide (2) and subsequent reaction of 2 with various aliphatic primary amine in a parallel fashion. The products were confirmed by 1H NMR, MS, IR and X ray crystallographic analysis. The unusual selectivity of the cyclization was probably due to the geometry of the guanidine intermediate.
基金Project supported by the National Natural Science Foundation of China.
文摘Using the method of intracellular injection of horseradish peroxidase, the arborizations of several neurones with different functions in the segmental ganglia of the leech Whitmania pigra are investigated. Comparison is made in each kind of neurones in order to verify their typical pattern. Results show that the morphology of the axonal arbors of identified neurones has an accurate similarity within and among the individuals of the leech, and the axonal arborizations of the bilaterally identified neurones in the same ganglion have a stable symmetry. The possible reasons of the formation and its functional significance of the symmetrical nervous system are discussed.
文摘one通常可用来替代上文中出现过的可数名词或以可数名词为中心词的整个名词词组,既可指人,也可指物。例如:The speed of the new machine ismuch greater than that of the oldone.There was an old man and ayoung one there.one的复数形式是ones,只能替代复数可数名词,既可指人,也可指物。
文摘In the early winter of 2017-18,Xie Yuan,vice-president of the Chinese People’s Association for Friendship with Foreign Countries,visited Belgium to award the title of Friendship Ambassador posthumously to Henri Lederhandler,an old associate of the CPAFFC,and presented the Belgium-China Friendship Award to six other Belgians.
文摘Everyone needs friends.Different people have different ideas about making friends.Some like to make friends with those who are honest and easy to communicate with,some like those who study hard and love sports,and still others like those who are lively,outgoing and ready to help others.
基金Supported by the Program of Jingdezhen Municipal Joint Association of Social and Scientific Circle (103120401)Staged Fruits of National Natural Science Foundation(41061020)~~
文摘Origin of Fengshui Woods was studied, 3 representative standpoints (Fengshui doctrines, greening and worship of the god of land) about Fengshui woods were analyzed, and worship of the god of land was believed as a reasonable origin view through considering natural and social factors of ancient China, as well as universal mental characteristics of people in the prescience age. To identify advantages and disadvantages of these 3 views, Carl G. Jung' theory of mythological prototype criticism and Sir James George Frazer's anthropological study were borrowed to prove that Fengshui Woods originated from ancient Chinese worship of the god of land, and such worship gradually evolved into practices of planting Fengshui Woods for their propitious signs. On this basis, enlightenment of Fengshui Woods to modern society was disclosed to protect present Fengshui Woods and forest resources.
文摘The Beijing 2022 Olympic and Paralympic Winter Games, known as the Beijing 2022 Games, took place in Beijing and nearby Zhangjiakou city of Hebei province. The Beijing competition zone undertook all the ice events, the Yanqing competition zone was for luge, skeleton, bobsleigh and alpine skiing, and the Zhangjiakou competition zone undertook all the other snow events except the above-mentioned ones.
文摘In our daily life,we can’t avoid associating with people in the world,so it is important for us to know how to get along with others.In my opinion,to get along with others,we must remember the following advices①.First,we need to be honest with others.Telling lies surely makes people stay far away from you.Just as an old saying goes,"Honesty is the best policy."Second,we should be modest enough.If we are proud in public,we can hardly win others②respect.Finally,we shouldn’t be selfish.We should learn to share.
基金Supported by Scientific Research Foundation of Yunnan Provincial Department of Education "Study on Landscape Features of Traditional Mountainous Settlements of The Bai Nationality in Dali" (2012Y235)
文摘In view of the vast mountainous areas and abundant mountainous settlement resources of Dali Bai Nationality Autonomous Prefecture, the authors proposed the significance and necessity of studying landscape features of traditional mountainous settlements of the Bai Nationality by considering policy requirements of "protection system planning of famous historic and cultural cities, towns, villages and blocks in Yunnan Province" and "construction of mountainous towns". On the basis of investigating traditional mountainous settlements of the Bai Nationality in Dali, 5 typical settlements were analyzed from the perspectives of landscape structure, village layout, landscape element, landscape materials and decorative art. And characteristics of traditional mountainous settlements of the Bai Nationality were summarized as "following the nature, adaptive to actual terrains, multidimensional, human-nature oneness".
文摘Proceeding from the concept of Fengshui, the author focused on the influence of Fengshui on construction activities in ancient China, and proposed that Fengshui has impacted not only site selection and layout of ancient cities, towns, villages, palaces and residences, but also site selection and layout of classical Chinese gardens. On this basis, application of Fengshui in modern landscape architecture design was explored, and the harmony between garden planning and environment factors was stressed, and also psychological factors of human beings emphasized. In this way, the doctrine of "human-nature oneness" was demonstrated, spirit of place and actual conditions of the planning site respected, and propitious culture manifested.
