首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 335 毫秒
1.
2.
郑浩 《科技信息》2008,(22):155-157
The Chinese conception of "oneness with man and heaven"and the Western tradition of man’s separation from nature accompanied by a subject- object dichotomy are the cores of each culture, which largely decides the discrepancy in various aspects of the Chinese and Western ways. To have an embedded and penetrating idea about the differences between the two cultures, it is necessary to gain sufficient knowledge of man- nature relation in dominant Chinese and Western conceptions. This paper aims to explore this issue from the perspective of Taoism and Confucianism in Chinese context, and ancient Greek and Hebraic heritage and modern mechanical view in Western tradition.  相似文献   

3.
The latest progress in the multiuser detection and independent component analysis (ICA) is reviewed systematically. Then two novel classes of multiuser detection methods based on ICA algorithms and feedforward neural networks are proposed. Theoretical analysis and computer simulation show that ICA algorithms are effective to detect multiuser signals in code-division multiple-access (CDMA) system. The performances of these methods are not identical entirely in various channels, but all of them are robust, efficient, fast and suitable for real-time implementations.  相似文献   

4.
Cyclic carbonates e.g. ethylene- and propylene carbonate undergo ring-opening polymerization (ROP) at elevated temperatures ( 〉 100 ℃ ) in the presence of initiators such as Lewis acids, bases, or transesterification catalysts to yield poly(ether carbonates) as outlined below. See Fig. 1.  相似文献   

5.
ERP dissociations between implicit and explicit memory have been confirmed by a large amount of evidence in theories of human memory. However, similarities between the two forms of memory have scarcely been studied. A possibility is that while implicit memory and explicit memory have independ- ent components, they might additionally have shared components. To explore this question, an ERP experiment was conducted with a study-to-test paradigm, in which participants performed a "shallow" (color) study task or a "deep" (pleasant) study task, followed by either a lexical decision (implicit) test (Section 1) or a recognition (explicit) test (Section 2). An interference task was performed concurrently with either the encoding or the retrieval phase of the memory task for encoding interference condition or retrieval interference condition. We compared ERP signatures of implicit and explicit memory as a function of depth of processing or interference. Under the action of the same variables, 300―500 ms old/new ERP effects of implicit and explicit memory showed the same trend. These effects maybe all link with a perceptual representational system. 500―700 ms old/new ERP effects of the two memories were dissociated. They may probably reflect voluntary and involuntary recollection respectively. These results suggested that implicit and explicit memories are not completely independent of each other, but have both independent and shared components.  相似文献   

6.
Telechelic polymers have attained great consideration as building blocks in the synthesis of block copolymers and networks. Telechelic polymers with various endgroups are also widely used materials for the preparation of polymeric prodrugs. Several methods have been reported to obtain functionalized polymers from the corresponding polyisobutylene (PIB) and polyether derivatives. In this presentation, we will demonstrate very versatile and powerful synthetic methods to obtain telechelic polymers.  相似文献   

7.
刘辉 《科技信息》2007,(9):135-135
Instead of being a boring subject, grammar is in fact one of the most exciting, creative, relevant subjects. It is sometimes described as the skeleton of a language, but it is much more than bones. It is the language's heartbeat, for without grammar; there can be no meaningful or effective communication. And grammar has different definitions and categories according to different contexts. By first reviewing the past linguists, especially those grammarians and their research, the paper makes some comparisons between some categories of grammar and puts forward that there is no 'good' or 'bad' grammar but knowing grammar or knowing about grammar really has a close relationship with effective communication.  相似文献   

8.
Ourlanguageisinextricablyboundupwithourhu manity.Tobehumanistouselanguageandtotalkistobeaperson.Languageuse,andthewordswhicharein troducedintoalanguage,reflecttheviewsandvaluesofsociety.Alanguageorwordsofalanguagecannotbeeithergoodorbadbutcanonlyviewe…  相似文献   

9.
Aims and Scope     
Wuhan University Journal of Natural Sciences aims to promote rapid communication and exchange be-  相似文献   

10.
This paper briefly accounts the background of American values and beliefs. It analyses the essence of the American ideals and points out that the American values are exaggerated and glamorized by the American upper class. They are in a sense, a dose of anaesthetic and a kind of hypocrisy.  相似文献   

11.
Organosilicon compounds have been widely researched and have the maximum species besides hydrocarbons. In the progress of the research work, many scientists pay attention to the organic silicon compounds that have vari-ety reactive functional groups[1,2]. The difunctional disi-lanes are very active; they could react with not only the compounds containing reactive hydrogen atoms, but also the reactive polymers. Therefore, the disilanes with di-functional groups could be used as disilane substit…  相似文献   

12.
1 Introduction As a natural and renewable resource product ,rosin andits derivatives have been usedin paint ,vanishes ,printingink,paper and wood products for their fil mforming properties . But rosin is liable to oxidation be-cause of its double bonds . Rosin can be modified by two different methods which are based on the reactionwith carboxyl groups and unsaturated part of the rosin molecular .That is ether esterificationreaction or addi-tionreaction.In this paper ,two modified methods were…  相似文献   

13.
RapidPrototypingandManufacturingTechnologyandItsIntegrationwithCIMS¥WangJianguo,YanYongnian,DuZhaohui王建国,颜永年,杜昭辉(Departmentof...  相似文献   

14.
15.
In Toni Morrison's works ,there seems to be an eternal theme——the cruelty of black American peoples' fate and the conflict between black culture and white culture. Black culture is in an inferior position for a long time. In Morrison's opinion,the blacks can only survive in the white -dominated world on condition that they hold their own cultural root. And on the other hand,there is another way people should seek,which is to realize tolerance and compatibility of the two cultures. In this speech,Morrison again expounded the relation between the two cultures and expressed her wish that black culture could be admitted and respected by the white people.  相似文献   

16.
1 Introduction Cyclic carbonates e.g. ethylene- and propylene carbonate undergo ring-opening polymerization (ROP) at elevated temperatures (> 100 ℃) in the presence of initiators such as Lewis acids, bases, or transesterification catalysts to yield poly(ether carbonates) as outlined below.See Fig.1.1IntroductionCyclic carbonates e .g.ethylene-and propylene carbonate undergo ring-opening polymerization (ROP) atelevatedtemperatures ( >100 ℃) in the presence of initiators such as Lewis acid…  相似文献   

17.
1 Introduction It is well known that nucleobases are very important biological molecules. Sensitive and selective probes for nucleotides and nucleobases are highly desirable. A number of modified nucleobases and nucleotides as well as artificial hosts wit…  相似文献   

18.
The reconfigurable chip, which integrates the advantages of high performance, high flexibility,high parallelism, low power consumption, and low cost, has achieved rapid development and wide application. Generally, the control part and the computing part of algorithm is accelerated based on different reconfigurable architectures, but it is difficult to obtain overall performance improvement.For improving efficiency of reconfigurable structure both for the control part and the computing part,a hyb...  相似文献   

19.
WA Chalifoux  SK Reznik  JL Leighton 《Nature》2012,487(7405):86-89
The enantioselective allylation of ketones is a problem of fundamental importance in asymmetric reaction design, especially given that only a very small number of methods can generate tertiary carbinols. Despite the vast amount of attention that synthetic chemists have given to this problem, success has generally been limited to just a few simple ketone types. A method for the selective allylation of functionally complex ketones would greatly increase the utility of ketone allylation methods in the chemical synthesis of important targets. Here we describe the operationally simple, direct, regioselective and enantioselective allylation of β-diketones. The strong tendency of β-diketones to act as nucleophilic species was overcome by using their enol form to provide the necessary Br?nsted-acid activation. This reaction significantly expands the pool of enantiomerically enriched and functionally complex tertiary carbinols that may be easily accessed. It also overturns more than a century of received wisdom regarding the reactivity of β-diketones.  相似文献   

20.
Mitogen-activated protein kinase (MAP kinase) cascade and maturation-promoting factor (MPF) play very important roles during meiotic maturation and fertilization of oocyte. Interaction between MAP kinase and MPF influences meiotic maturation and fertilization of oocyte throughout the animal kingdom, including stimulation of germinal vesicle breakdown (GVBD), suppression of DNA replication, control of meiotic chromosome segregation, maintenance of metaphase II arrest, and resumption and completion of second meiosis. This review focuses on the function and interaction of MAP kinase and MPF during meiotic maturation and fertilization of oocyte.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号