检索结果-南通市图书馆

STUDY OF REFLECTION FROM gradual TRANSITION SOUND ABSORBERS

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

Chinese Science Bulletin 1966年第3期24卷 113-115页

作者：尚尔昌朱维庆侯秉珍王九奎 Institute of Acoustics Academia Sinica

Ⅰ. THEORY The problem of reflection from a gradual transition sound absorber has been investigated, in general, by finding the solution of a differential equation of the Riccati type, and also by experiment. We have dealt with this problem as a boundary value problem of the wave equation. The expression for the reflection factor of a gradual transition lining - (Fig. 1) is given

关键词： absorber Riccati lining finding gradual satis dimensions acoustics realized wedge

Compactness in fuzzy logic

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1998年第14期43卷 1166-1171页

作者： YING Mingsheng Department of Computer Science and Technology, Tsinghua University, Beijing 100084, China Department of Computer Science and Technology Tsinghua University Beijing China

Compactness in Pavelka’s fuzzy logic for some compact lattices of truth values is shown, and the concept of gradual compactness is introduced to establish some corresponding results in a more general setting.

关键词： fuzzy logic compactness gradual compactness.

AN INTRODUCTION TO KEEPING-FIT MASSAGE(1)

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 1993年第3期13卷 120-123页

作者：臧福科 Department of Massage Dongzhimen HospitalBeijing College of TCMBeijing100700

Massage,called Anmo (pressing andrubbing) in ancient times,is a non-drugtherapy,characterized by its simplicity,con-venience,cheapness and effectiveness,whichhas been used as one of the effectivekeeping-fit measures since thausands ofyears *** gradual improvement of people’sliving standard,the problem of health carehas been put on the agenda,receiving a wideattention from the medical *** has a long history of civilization,scholars of successive ages have left to ournation ample valuable knowledge of *** many theories I am much infavour of the keeping fit idea,the“

关键词： simplicity successive circle valuable keeping gradual pressing ancient agenda instead

Middle Yangtze sea-basin over Paleozoic-Mesozoic transition——Sedimental continuity and environmental catastrophe

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2002年第8期45卷 730-740页

作者：黄定华姚凌青王君慧郭浩张恒段怡春李斌张凡殷鸿福 Faculty of Earth Science China University of GeosciencesWuhan 430074China Faculty of the Earth Science and Resources China University of GeosciencesBeijing 100082China Department of Geology Peking UniversityBeijing 100871China

On the centimeter scale of lithologic change, we conduct poly-statistic analysis on the sedimentary behavior and dynamic features of the stratigraphic sequence from upper Dalong formation to lower Daye formation, which across the Permian-Triassic boundary in East Hubei. From the perspective of stochastically dynamic system, the depositional process of upper Dalong formation can be regarded as a stable Markovian process with weakly stratigraphic correlation and randomly lithologic alteration. Compared to it, the depositional process of lower Daye formation was unstable Markovian process with much closer stratigraphic correlation and ordered lithologic change. As for the replacement style of the sedimental cycle, the former was chaotic, while the latter was periodical. Otherwise, although the overall depositional process of the two formations was continuous, their dynamic characteristics were obviously different. So this P-T sedimental boundary can also be regarded as a dynamic limit. It was a kind of depositional reaction in response to a catastrophic alteration when the geological environment was in continuous change but came over a certain threshold state.

关键词： middle Yangtze sea-basin transition of Paleozoic-Mesozoic randomly dynamic system sedimentary environment depositional cycle chaos gradual change catastrophe.

ON INTEGRATIVE GEOTECTONICS

在线全文

学校读者我要写书评

暂无评论

Geotectonica et Metallogenia 1996年第Z1期20卷 1-7页

作者： Chen Guoda(Changsha Institute of Geotectonics, Academia Sinica, 410003,Hunan, China)Xiang Jixi (The Chinese Academy of Geological Sciences, Beijing, China)

Based on historistic-causationist geotectonics proposed by Chen Guoda in1992, the authors attempt to further extend its contents and ranges, establish integrative geo-tectonics with wide ranges and higher synthesis. Integrative geotectonics is defined as a disci-pline to study very synthetically the whole history and causationistic relations of formation and evolution of the global tectonics (including the crustal and deep teetospheric structures) with the comprehensive analysis method. It is also called as "crustobody geotectonics" for its main geotectonic element is crustobody. Its characteristics are: (1) regarding the internal and exter-nal dynamics forming the earth’s structure as multi-origined, polygenetic compound resultant force system; (2) studying motions of the global tectospheres and among them as a multiple and interrelative dynamic system; (3) studying integratively and the unitedly on the internaland extenal (e. g. meteorite impact) factors of evolution and motion of crustobodies constituting the earth’s hard shell (lithosphere); (4) besides the contents above reviewing main relative controversies in history of geology, e. g. between gradual change and mutation (or between uniformitarinanisnl and catastrophism), f ixism and mobilism, vertical and horizon-tal movements.

关键词： integrative geotectonics crustobody geotectonics multi-origined and polygenetic compound resultantforce system tectosphere gradual change mutation catastrophism

On China's Economic Situation

在线全文

学校读者我要写书评

暂无评论

China's Foreign Trade 1999年第3期 20-24页

THE MOTION OF THE FLARE LOOP PROMINENCE ON APRIL 27,1981

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 1982年第5期27卷 519-523页

作者：顾啸马李苏川李志李伯殊 Yunnan Observatory Academia Sinica

On the 27th of April of 1981, a larger flare loop prominence appeared above the sunspot group (N 14°;L 149°, which was assigned by the Yunnan Observatory Serial No. 200 or the Boulder SESC Serial No. 3049), on the ... 详细信息

关键词： APRIL assigned appeared burst lament storm handed deviation gradual brightness

Vascular Plants of the Maritime Antarctic: Origin and Adaptation

在线全文

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2011年第3期2卷 381-395页

作者： Ivan Parnikoza Iryna Kozeretska Viktor Kunakh 不详

The question of why only two species of vascular plant have colonized Antarctica has not been fully answered. This review is based on a series of parallel analyses of distribution, ecology, and adaptation on the morphological, cellular, and molecular genetic levels, and addresses the causes of the exclusive adaptation of Deschampsia antarctica Desv. (Poaceae) and Colobanthus quitensis (Kunth) Bartl. The authors conclude that the unique distribution of these species, including the Antarctic Peninsula, is not related to the presence of any specific mechanisms of adaptation to the ex-treme environment, but rather is a result of a gradual adaptation of these taxa to the extreme conditions during the de-velopment of glacial events and wide distribution and a substantial seed bank which could ensure mosaic survival in some ice-free areas, as well as survival through several years of snow and ice cover. Glaciological, molecular, popula-tion and reproduction biology studies are still necessary to deepen our understanding of the timing of the colonization of the region by vascular plants. However, keeping in mind that molecular methods alone are unlikely to give exhaus-tive evidence, application of other adequate methods in the context of the history of Pleistocenic glaciation in the region is also necessary to answer the question.

关键词： Deschampsia antarctica Colobanthus quitensis Unique Adaptation Time of Colonization gradual Adaptation

Cerebrovascular disease

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

外科研究与新技术 1993年第3期 185-186页

930595 Chronic subdural hematoma and itspathogenesis--Clinical analysis of 150 *** Shuyuan(岳树元),et *** Neuroc-surg,Tianjin Med Coll Hosp,*** J 1993;21(4):212-215.A report of 150 cases of chronic subduralhematoma(CSDH),74％ with a history of headinjury,was *** was found that the ex-ternal membrane of hematoma had rich *** was suggested that overactivation infibrinolytic system was the fundamental cause forthe gradual increase of the size of the *** commonly occurred in the elderly over 60years,with 86.67％ of the hematomas in

关键词： hematoma CSDH subdural Tianjin elderly gradual rCBF personality drainage edema