检索结果-南通市图书馆

Digital image analysis of palaeoenvironmental records and applications

在线全文

学校读者我要写书评

暂无评论

chinese Science Bulletin 2002年第23期47卷 1957-1963,2025-2026页

作者： SUN Donghuai1,2. LIU Yu2.& TAN Ming31. south china Sea {2. of Oceanology, chinese academy of sciences. guangzhou 510301, china 2. State Key Laboratory of Loess and Quaternary Geology, Earth Environmental {2., chinese academy of sciences, Xi’an 710075, china 3. {2. of Geology and Geophysics, chinese academy of sciences, Beijing 10002., china south china Sea {2. of Oceanology Chinese Academy of Sciences Guangzhou China State Key Laboratory of Loess and Quaternary Geology Earth Environmental Institute Chinese Academy of Sciences Xi’an China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

Environmental change signals in geological or biological records are commonly reflected on their reflecting or transmitting images. These environmental signals can be extracted through digital image analysis. The analysis principle involves section line selection, color value reading and calculating environmental proxy index along the section lines, layer identification, auto-chronology and investigation of structure evolution of growth bands. On detailed illustrations of the image technique, this note provides image analyzing procedures of coral, tree-ring and stalagmite records. The environmental implications of the proxy index from image analysis are accordingly given through application demonstration of the image technique.

关键词： digital image environmental records.

Experimental study of ore gabbro liquid immiscibility

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2005年第4期48卷 496-505页

作者： SANG Zunan1,2. XIA Bin1, ZHOU Yongsheng3 & JIN Zhenmin4 1. guangzhou institute of Geo{2., chinese academy of sciences, guangzhou 510640, china 2. wuhan university, wuhan 430072. china 3. institute of Geology, china Seismological Bureau, Beijing 10002., china 4. Faculty of Earth sciences, china university of Geosciences, wuhan 430074, china guangzhou institute of Geo{2. Chinese Academy of Sciences Guangzhou China wuhan university Wuhan China institute of Geology China Seismological Bureau Beijing China Faculty of Earth sciences China University of Geosciences Wuhan China

In this paper, the authors present the results of a preliminary experimental study on partial melting of fine-grained gabbro, Panzhihua, Sichuan Province, china. Experiments were conducted under (confining) pressure ranging from 450 to 500 MPa and temperature of 900— 12.0℃. The results show that the initial melt is distributed along grain boundaries and triple junctions. Liquid immiscibility phenomena are noted in the melt with two compositional different melt phases, i.e. matrix and sphere phases. The matrix phase is relatively rich in Si, Al and K, and is depleted in Mg, Fe, Ca, Na and Ti, whereas the sphere phase shows opposite trends. The calculation of the melt free energy indicates that the liquid immiscibility is governed by the rule of thermodynamics, as the liquid immiscibility would result in the decrease in free energy of the melt system. The field relationships suggest that the liquid immiscibility may have played an important role in the generation of ore magma of Panzhihua V-Ti magnetite ore deposit. This study thus provides experimental constraints on the mechanism of the formation of V-Ti magnetite deposite.

关键词： partial melting, experimental study, gabbro, liquid immiscibility, ore formation mechanism.

SHRIMP zircon U-Pb geochronology of early Mesozoic felsic igneous rocks from the southern Lancangjiang and its tectonic implications

在线全文

学校读者我要写书评

暂无评论

Science china Earth sciences 2006年第10期49卷 1032-1042页

作者： PENG Touping1,2. WANG Yuejun1, FAN Weiming1, LIU Dunyi3, SHI Yuruo3 & MIAO Laicheng4 1. Key Laboratory of Isotope Geochronology and Geochemistry, guangzhou {2. of Geochemistry, chinese academy of sciences, guangzhou 510640, china 2. Graduate university of chinese academy of sciences, Beijing 100039, china 3. SHRIMP isotope Laboratory, chinese academy of Geological {12., Beijing 100037, china 4. {2. of Geology and Geophysics, chinese academy of sciences, Beijing 10002., china Key Laboratory of Isotope Geochronology and Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou China Graduate university of chinese academy of sciences Beijing China SHRIMP isotope Laboratory Chinese Academy of Geological Sciences Beijing China institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

The SHRIMP zircon U-Pb geochronology of three typical samples, including two monzo nitic granites from the Lincang batholith and a rhyolite from the Manghuai Formation are presented in the southern Lancangjiang, western Yunnan Province. The analyses of zircons for the biotite monzonitic granites from the northern (02.X-137) and southern (2.JH-10) Lincang batholith show the single and tight clusters on the concordia, and yield the weighted mean 2.6Pb/2.8U ages of 2.9.4 ± 3.0 Ma and 2.0.4 ± 3.6 Ma, respectively, representing the crystallized ages of these granites. The zircons for the rhyolitic sample (02.X-95) from the Manghuai Formation give a weighted mean 2.6Pb/2.8U age of 2.1.0 ± 5.0 Ma. These data suggest that the igneous rocks from the Lincang granitic batholith and Manghuai Formation have a similar crystallized age. In combination with other data, it is inferred that both were generated at a narrow age span (~2.0 Ma) and were originated from the postcollisional tectonic regime. An early Proterozoic 2.6Pb/2.8U apparent age of 1977±44 Ma is additionally obtained from one zircon from the biotite monzonitic granite (southern Lincang batholith), indicative of devel- opment of the early Proterozoic Yangtze basement in the region. These precisely geochronological data provide important constraints on better understanding the Paleozoic tectonic evolution of the Tethys, western Yunnan Province.

关键词： SHRIMP zircon U-Pb dating, Middle Triassic, Lincang granitic batholith, Manghuai Formation rhyolite, southern Lancangjiang.

Study on fish community structure in the Zhujiang Estuaryand its adjacent waters

在线全文

学校读者我要写书评

暂无评论

Acta Oceanologica Sinica 1999年第4期18卷 581-589页

作者： Zhan Haigang( south china As Fisheries {2., chinese academy of Fishery sciences, guangzhou 510300, china) south china Sea Fisheries {2. Chinese Academy of Fishery Sciences Guangzhou 510300 China

Based on data of demersal trawl Samples from 1987 to 1988 in the Zhujiang Estuary and its adjacent waters, relationships between fish community and environmental factors are studied by using clssification , MDS ordina-tion and several community parameters. The results shaw that the distribution of fish shoes is zoned by salinty anddivided into three types. The freshwater community which is restricted in the lianhua Hill - Humen waterway is sim-ple and stable, the coastal community which lives in the shallow waters is complex, and the estuary community whichis idenhfied in the Lingdingyang area and affected by Physical and ecological pinemore greatly greatly has obvious seasonalvariations.

关键词： Zhujiang Estuary fish community structure ordination

Some properties on multivariate filter banks with a matrix factorization

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2005年第2期15卷 20-30页

作者： lian Qiaofang1, XIAO Hongying2. and CHEN Qiuhui3(1. Department of Mathematics, Beijing Jiaotong university, Beijing 100044, {2. 2. institute of Mathematics, academy of Mathematics and System sciences, chinese academy of sciences, Beijing 100080, {2. 3. Department of Scientific Computing and Computer Applications, Zhongshan university, guangzhou 5102.5, {2.) Dept. of Mathematics Beijing Jiaotong Univ. Beijing 100044 China Inst. of Mathematics Acad. of Math. and System Sci. Chinese Acad. of Sciences Beijing 100080 China Dept. of Scientific Computing Zhongshan Univ. Guangzhou 510275 China

A class of multivariate filter banks with a matrix factorization has been developed by Chen et al. The main purpose of this paper is to discuss some further properties of this kind of filter bank, such as the completeness, accuracy of the corresponding scaling functions and the relationships with Daubechies' wavelets and the multi-wavelets provided by Chui and lian. Moreover, some examples are given to show that this kind of filter bank has a higher accuracy for the scaling functions.

关键词： filter banks completeness accuracy matrix factorization

Normality and shared values concerning differential polynomials

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science china Mathematics 2010年第3期53卷 749-754页

作者： LEI ChunLin 1 & FANG Mingliang 2. 1 Department of Applied Mathematics, south {2. Agricultural university, guangzhou 510642. {2. 2.institute of Applied Mathematics, south {2. Agricultural university, guangzhou 510642. {2. Department of Applied Mathematics South China Agricultural University Guangzhou China institute of Applied Mathematics South China Agricultural University Guangzhou China

Let F be a family of functions meromorphic in a domain D, let P be a polynomial with either deg P≥3 or deg P = 2.and P having only one distinct zero, and let b be a finite nonzero complex number. If, each pair of fun... 详细信息

关键词： meromorphic function normality shared value

Size Effects of Nano-crystalline Cellulose

在线全文

学校读者我要写书评

暂无评论

chinese Chemical Letters 2003年第9期14卷 977-978页

作者： Guo Kang LI, Xiao Fang LI, Yong JIANG, Mei Zhen ZENG, En Yong DINGKey Laboratory of Cellulose and Lignocellulosics chemistry guangzhou {2. of chemistry, chinese academy of sciences, guangzhou 510650 Key Lab. Cellulose/L. Guangzhou Institute of Chemistry Chinese Academy of Sciences Guangzhou 510650 China

Natural cellulose with the crystal form of cellulose Ⅰ, when treated with condensed lye (e.g. 18%NaOH), can change into new crystal form of cellulose Ⅱ. But the nano-crystalline cellulose (NCC) can do it when only treated with dilute lye (e.g. 1%NaOH) at room temperature and even can dissolve into slightly concentrated lye (e.g. 4%NaOH).

关键词： Cellulose Ⅰ cellulose Ⅱ nano-crystalline cellulose.

From dissection of disease pathogenesis to elucidation of mechanisms of targeted therapies:leukemia research in the genomic era

在线全文

学校读者我要写书评

暂无评论

Acta Pharmacologica Sinica 2007年第9期28卷 1434-1449页

作者： Guang-blao ZHOU~(1,2.,Guo LI~1,Sai-juan CHEN~1,Zhu CHEN~(1,3)~1 State Key Laboratory of Medical Genomics and Shanghai institute of Hematology,Rui Jin Hospital Affiliated to Shanghai Jiao Tonguniversity School of Medicine,Shanghai 2.002., {2. ~2.guangzhou institute of Biomedicine and Health,chinese academy of sciences,guangzhou 510663,{2. State Key Laboratory of Medical Genomics and Shanghai institute of Hematology Rui Jin Hospital Affiliated to Shanghai Jiao Tong University School of Medicine Shanghai China guangzhou institute of Biomedicine and Health Chinese Academy of Sciences Guangzhou China

Leukemia is a group of heterozygous diseases of hematopoietic stem/progenitorcells that involves dynamic change in the *** of genetic abnor-malities critical to leukemia initiation provides insights into the elusiveleukemogenesis,identifies distinct subsets of leukemia and predicts prognosisindividually,and can also provide rational therapeutic targets for *** past three decades have seen tremendous advances in theanalysis of genotype-phenotype connection of leukemia,and in the identifica-tion of molecular biomarkers for leukemia ***,differentiationtherapy,targeted therapy and chemotherapy have turned several subtypes ofleukemia from highly fatal to highly *** use of all-trans retinoic acid andarsenic trioxide,which trigger degradation of PML-RARα,the causative fusionprotein generated by t (15;17) translocation in acute promyelocytic leukemia (APL),has led to a dramatic improvement of APL clinical outcome,lmatinib mesylate/Gleevec/STI571,which inhibits the tyrosine kinase activity of BCR-ABLoncoprotein,has now become the new gold standard for the treatmtent of chronicmyeloid *** use of chemotherapeutic agents together with a strin-gent application of prognostic factors for risk-directed therapy in clinical trialshas resulted in a steady improvement in the treatment outcome of acute lympho-blastic ***,the pace of progress extrapolates to a prediction ofleukemia control in the twenty-first century.

关键词： leukemia genomics cancer therapy

Superlarge ore deposits and development of china's mineral resources

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

chinese Science Bulletin 1999年第15期44卷 1436-1440页

作者： ZHAO Zhenhuaguangzhou institute of Geo{2. , chinese academy of sciences , guangzhou 510640, china Guangzhau institute of Geochemistry Chinese Academy of Sciences Guangzhou China

The ever increasing demand of mineral resources in china was assessed and it is suggested that the development of superlarge ore deposits was the best way to meet such demand. Research and exploitation of superlarge ore deposits can bring great economic and social benefits to the society. It is also the best way to a better integration of resource industry development and environmental protection and therefore provides a basis of sustainable development of china. china has made important advancements in the research of superlarge ore deposits and especially in classification, selectivity and confinement of deposit types and temporal and spatial distributions. It is suggested that the metallodynamics and the interaction between the crust and the mantle and the core should be studied. At the same time, a new concept of resources should be established in order to build a new integrated system for research, and resource development and environmental proiection.

关键词： superlarge ore deposit metallodynamics resource-environmental integration.