检索结果-南通市图书馆

Yanshanian Magma-Tectonic-Metallogenic Belt in East china of Circum-Pacific Domain(Ⅰ):Igneous Rocks and Orogenic Processes

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 Earth Science 1999年第1期18卷 25-28页

作者： Deng Jinfu Mo Xuanxue Zhao Hailing Luo Zhaohua Zhao Guochun department of Geology and Mineral Resources, china {2. of Geosciences, beijing 100083 department of Geology and Mineral Resources China University of GeosciencesBeijing 100083

Yanshanian igneous rocks in the East china, on an orogenic belt scale, are characterized by the continental marginal arc in petrology and geochemistry as Andes and West USA, except for the Hercyn type biotite two mica muscovite granite belt in the Nanling region. Three segments of the Yanshanian igneous rocks along the belt are recognized. In terms of magma tectonic event sequence, the north, middle and south segments have counter clockwise (ccw), clockwise (cw) and ccw+cw pTt paths of the orogenic process, respectively. A genetic model of the lithospheric delamination (loss of the lithospheric root in about 12. km) in combination with the oceanic subduction for the Yanshanian Andes like orogenic belt and both the crust and lithosphere thickening for the Yanshanian Hercyn type Nanling orogenic belt in the East china is suggested.

关键词： Yanshanian igneous rocks orogenic processes ccw/cw pTt path East china.

Inclusion Complexation of β-CD with Phenothiazine and N-Alkylphenothiazine Derivatives

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1998年第11期9卷 0-0,0-0页

作者： Wen Guang LI Xiu Qin RUAN Qing Xiang GUO You Cheng LIU (Institute of Chemical Metallurgy, Chinese Academy of Sciences, beijing 100080)(National Laboratory of Applied Organic chemistry, Lanzhou {2., Lanzhou 730000)(department of chemistry, Univer Institute of Chemical Metallurgy Chinese Academy of Sciences Beijing 100080 China Natl. Lab. of Appl. Organ. chemistry Lanzhou University Lanzhou 730000 China department of chemistry Univ. of Sci./Technology of China Hefei 230026 China

Inclusion of Acyclodextrin (ACD) with phenothiazine 1 and Nalkylpheno-thiazine derivatives (alkyl = ethyl 2. isobutyl 3 and isopentyl 4) in aqueous solution was studied by means of UV-vis spectroscopy. The association constant Ka values for the inclusion of β-CD with 1, 2. 3 and 4 were determined to be 188, 2.4, 12. and 80 L/mol, respectively. It indicates that the stability of the inclusion complexes is dependent on the structure and the volume of the substituents in the guest compounds.

关键词： β-cyclodextrin inclusion complex phenothiazine derivatives stability

THE (ｕ＋κ)-ORBIT OF ESSENTIALLY normal OPERATORS AND COMPACT PERTURBATIONS OF STRONGLY IRREDUCIBLE OPERATORS

在线全文

学校读者我要写书评

暂无评论

Chinese Annals of Mathematics,Series B 2000年第2期21卷 237-248页

作者： JIYOUQING JIANGCHUNLAN WANGZONGYAO departmentofMathematics JilinUniversityChangchun130023China. departmentofMathematics JilinUniversityChangchun130023China. departmentofMathematics EastChinaUniversityofScienceandTechnologyShanghai200237＂China.

Let н be a complex, separable, infinite dimensional Hilbert space, T　ε（Ｈ）. （ｕ＋Ｋ）（T） denotes the （ｕ＋ｋ）-orbit of T, i.e., （ｕ＋ｋ）（T） = {R-1TR: R is invertible and of the form unitary plus compact}. Let be an analytic and simply connected Cauchy domain in C and n ε N. A（, n） denotes the class of operators, each of which satisfies （i） T is essentially normal; （ii） σ（T） =,　ρF（T）　∩ σ（T） = ; （iii） ind （λ-T） = -n, nul （λ-T） = 0 （λ∈Ω ）. It is proved that given T1, T2.ε A（, n） and ε > 0, there exists a compact operator K with K 2.. This result generalizes a result of P. S. Guinand and L. Marcoux [6,15]. Furthermore, the authors give a character of the norm closure of （ｕ＋Ｋ）（T）, and prove that for each T ε A（, n）, there exists a compact （SI） perturbation of T whose norm can be arbitrarily small.

关键词： Essentially normal (u+k)-orbit Compact perturbation Spectrum Strongly irreducible operator

Study on Hypertext Based on Concept Net

在线全文

学校读者我要写书评

暂无评论

西南师范大学学报(自然科学版) 1999年第5期 531-535页

作者： Zhou Zhurong, Zhang Xiaozhen department of Computer Science, Southwest china {2. university, Chongqing 400715

Based on hypertexts definition, this paper researches the psychology theory of hypertext and disorientation in it, and studies the problems existing in the situation when hypertext is used in Computer Assisted Instruction (CAI). This paper presents an idea of using concept net as hypertexts psychology theory and hierarchy structure as main trunk to construct hypertext, which combined with navigator can reduce disorientation and is adaptive for CAI.

关键词： hypertext Computer Assisted Instruction concept net disorientation

DRIVING FORCE OF BAINITE TRANSFORMATION FOR Fe-C-Mn ALLOYS

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1990年第1期3卷 29-34页

作者： YANG Liu FANG Hongsheng CHEN Nanping Tsinghua university,beijing,{2. [Originally published in ACTA METALL SIN (CHINESE EDN) 2. (4) 1989 pp A2.4--A2.9 Correspondent:FANG Hongsheng department of Materials Science and Engineering,Tsinghua university,beijing,{2.

The regular solution model developed by Hillert and Stanffanson is applied to calculate the driving force for transformations with three possible mechanisms in the intermediate tempera- ture range between proeutectoid and martensite *** is made on the thermodynamical discussions for both diffusional and shear mechanisms for bainitic transfor- mations in different temperature ranges.

关键词： bainite isothermal transformation thermodynamics

THERMAL DEMAGNETIZATION AND RANDOMNESS OF DOMAIN NUCLEATION OF SINGLE PHASE Nd_2.Fe_(14) B

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1989年第7期2卷 27-32页

作者： LUO Yang JI Qigen ZHANG Ning SU Xiujin Central Iron and Steel Research Institute,Ministry of Metallurgical Industry,beijing,chinaSUN Daliang Shandong {2.,Jinan,china senior engineer,department of Precious Alloys,Central Iron and Steel Research Institute,beijing,china

Based on the observation of temperature variation of both domain structure and magnetic con- *** thermal demagnetization and randomness of domain nucleation was discussed.

关键词： domain structure Nd_2.e_(14)B thermal demagnetization domain nucleation

TEUPERNIN D: A CHLORINE-CONTAINING NEO-CLERODANE DITERPENE FROM TEUCRIUM PERNYI

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 1991年第11期2卷 845-846页

作者： Ning XIE~1. Zhi Da MIN~1, Shou Xun ZHAO~1. Yang LU~2.Qi Tai ZHENG~2.and Chun Shu WANG~2.1. department of Phytochemistry,{2. Pharmaceutical university, Nanjing, 2.0009 2. Institute of Materia Medica, Chinese Academy of Medicinal Sciences, beijing. 100050

A new chlorine-containing neo-clerodane diterpene, teupernin D, was isolated from the aerial parts of Teucrium pernyi. The structure for teupernin D was established as (12.) -15, 16-epoxy-8β-hydroxy-17-chloro-19-nor10α-neo-cleroda-4, 13(16), 14-triene-18,6β;2.,12.diolide on the basis of spectral evidence. The absolute configuration was established by CD spectrum and confirmed by X-ray crystallographic analysis.

关键词： NEO TEUPERNIN D A CHLORINE-CONTAINING NEO-CLERODANE DITERPENE FROM TEUCRIUM PERNYI

Highly Active Rutile TiO2.for Photocatalysis

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2006年第S3期 396-399页

作者： Junping Yan~(1,2. Zilong Tang~1 Zhongtai Zhang~1 Zhigang Zhou~1 (1.State Key Laboratory of New Ceramics and Fine Processing,department of Materials Science and Engineering,Tsinghua university,{2. 100084,china) (2.College of Materials Science and Engineering,Taiyuan university of Technology,Taiyuan 03002.,china)

Nanocrystalline titania was prepared by the homogeneous-precipitation method at temperature lower than 12.℃. The properties of powders were identified by XRD,TEM and diffuse reflection *** results showed that rutile titania formed at 70℃without calcination in *** rutile TiO2.ad good crystalline and small particle *** formation mechanism of rutile was also *** photocatalytic activity of the prepared particles was tested for the degradation of methyl *** photocatalytic activity of rutile TiO2.as higher than those obtained from Degussa P-2. *** reasons for high photocatalytic activity of futile were discussed.

关键词： rutile titania photocatalyst needle shape

The basic theories of traffic economic belt (TEB)and its life-circle pattern

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 Geographical Sciences 1999年第4期9卷 415-420页

作者： YANG Yin-kai HAN Zeng-lin ZHANG HOng-li(Institute of Geography, Chinese Academy of Sciences, beijing 100101)(department ofGeography, Liaoning {2. university, Dalian 11602.)

With the development of productive forces. the space evolution of regional economicSystem keeps closer links with the traffic transport line. A kind of linear space regional scathetic bodyforms constantly and develops rapidly. Relying on the traffic trunk lines, it aggregates and *** the same time, it mixes population, industry, town, interflow of commodities, interflowof energy and interflow of information *** unique space regional synthetic body is calledtraffic economic belt (TEB). In the paper, the basic concepts, types and qualities of TEB wereelaborated and the life-circle theory was put forward creatively.

关键词： traffic economic belt (us), time and space evoluhon liferoircle