检索结果-南通市图书馆

Around the world in eighty days /

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Geochemistry and Petrogenesis of Basic and Ultrabasic Rocks Elogo Complex in Ivindo Archean Block (Congo Craton): Geodynamic Implications

丛书名： Oxford English picture readers

1978年

作者： verne Jules

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

Open Journal of Geology 2023年第2期13卷 107-135页

作者： Nelson Lekeba Makamba Vicky Tendresse Télange Bouenitela Ulrich verne Matiaba-Bazika Florent Boudzoumou Geodynamics Laboratory Faculty of Science and Technology Marien Ngouabi University Brazzaville Republic of the Congo Department of Geosciences National Institute for Research in Exact and Natural Sciences Brazzaville Republic of the Congo

The Elogo complex is a greenstone belt portion located on the Eastern edge of the Archean Congo craton at the junction with the Paleoproterozoic to Neoproterozoic sembe Ouesso basin. This study was carried out on this complex to determine the context of the placement of basaltic rocks. Metaluminous tholeiitic basalts (basic and ultrabasic), calc-alkaline basalts, andesitic basalts, and peraluminous calc-alkaline dacites represent greenstones. Tholeiitic and calc-alkaline basalts come from deep enriched and depleted mantle sources, including garnet in fusion residues [Alsub>2sub>Osub>3sub>/TiOsub>2sub> > 16 (16.5 to 35.12) and in some samples between 12.45 to 14.48;CaO/Alsub>2sub>Osub>3sub> 1 (1.04 to 1.35) in ten samples and (Gb/Yb)sub>PMsub> > 1]. The calc-alkaline dacites come from a shallow depleted mantle source [Alsub>2sub>Osub>3sub>/TiOsub>2sub> > 16;CaO/Alsub>2sub>Osub>3sub> 1]. Tholeiitic and calc-alkaline basalts have a negative Rb, Ba, Ce, and Nb anomaly without negative Ti anomaly, positive Ta, Pb anomalies, and a lack of significant REE [(La/Yb)n = 0.36 to 0.97 and 1 to 2.15;(Ce/Yb)n = 0.27 to 0.96 and 1.04 to 1.72, respectively] fractionation. High Nb/Th (2 to 10) and Nb/U (1.82 to 26) ratios and low La/Ta (5 to 27) ratios are characteristic of divergent margin magmatic sources. Tholeiitic and calc-alkaline basalts correspond to an extensive back-arc basin-type tectonic setting. Calc-alkaline andesitic basalts and dacites show positive Ba, U, Th, K, La, Ce, Pb, and Li anomalies and negative Nb, Ta, and Ti anomalies reflecting crustal contamination and hydrothermal alteration in a compressive tectonic context as a volcanic arc in a subduction regime marking the interruption of the meso-neoarchean Elogo’s opening. Elogo’s opening and closing are probably associated with the emplacement of the greenstone of the meso-neoarchean Gabon Belinga group and the relics of the Mesoarchean greenstones of the Cameroun Ntem complex.

关键词： Elogo Greenstone Archean Tholeiitic Andesitic Basalts Dacites Magma source

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

从地球到月球

丛书名：青少年百部成长经典

2006年

作者：（法）凡尔纳（verne J.）冯铁译

本书是科学探险小说。故事发生在一个多世纪前的美国，讲的是1865年美国南北战争之后人们针对月球开展的一系列探险活动。

ISBN: (纸本)7802032733

本书是科学探险小说。故事发生在一个多世纪前的美国，讲的是1865年美国南北战争之后人们针对月球开展的一系列探险活动。

关键词：科学幻想小说法国近代

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

普莱斯微型流速仪标准检定进展

水利信息化 1991年第2期 56-62+52页

作者： verne R.schneider George F.smoot 陈显荣重庆水文仪器厂

取50台新普莱斯微型流速仪,50台旧转子的旧普莱斯微型流速仪,50台新转子的旧普莱斯微型流速仪,26台直接触丝(不带珠头)的旧普莱斯微型流速仪,在检定槽上分别进行检定。新仪器的一组确立一个标准检定公式:V=0.961n+0.039,ft/s(V=0.293n+0... 详细信息

取50台新普莱斯微型流速仪,50台旧转子的旧普莱斯微型流速仪,50台新转子的旧普莱斯微型流速仪,26台直接触丝(不带珠头)的旧普莱斯微型流速仪,在检定槽上分别进行检定。新仪器的一组确立一个标准检定公式:V=0.961n+0.039,ft/s(V=0.293n+0.012,m/s)。

关键词：单台普莱斯流速仪流速计水文仪器标准误差

EXPONENTIAL MEsH APPROXIMATIONs FOR A 3D EXTERIOR PROBLEM IN MAGNETIC INDUCTION

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 Computational Mathematics 2005年第2期23卷 131-152页

作者： séraphinM.Mefire LaboratoireAmiénoisdeMathématiqueFondamentaleetAppliquée CNRSUMR6140UniversitddePicardieJules-Verne33r.Saint-Leu80039AmiensCedex1France

A numerical method combining the approaches of C.I. Goldstein and L.-A. Ying is used for the simulation in three-dimensional magnetostatics related to an exterior problem in magnetic induction. Recently introduced, this method is based on the use of a graded mesh obtained by gluing homothetic layers in the exterior domain and has been performed in the case of edge element discretizations. In this work, the theoretical and practical aspects of the method are inspected in the case of face element and volume element discretizations,for computing a magnetic induction. Error estimates, implementations, and numerical results are provided.

关键词： Exterior problems Magnetostatics Mixed formulations Graded meshes Faceelements Volume elements Boundary elements Truncations Error estimates

南Dakota黑丘区与一个早元古宙变质地体热演化有关的P—T—t轨迹

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

世界地质 1992年第1期11卷 176-180页

作者： Michael P.Terry La verne M.Friberg 李维海

由南Dakota的黑丘区前寒武纪陆核西部一个穹窿中变泥质岩内的带状石榴石和伴生矿物所确定的P—T—t轨迹表明是两条顺时针曲线,它们将先前所提出的1.850Ga和1.715Ga问影响早元古宙岩石的热构造事件联系起来。曲线的形态表明在此时问段内... 详细信息

由南Dakota的黑丘区前寒武纪陆核西部一个穹窿中变泥质岩内的带状石榴石和伴生矿物所确定的P—T—t轨迹表明是两条顺时针曲线,它们将先前所提出的1.850Ga和1.715Ga问影响早元古宙岩石的热构造事件联系起来。曲线的形态表明在此时问段内出现过两种截然不同的构造作用。第一条曲线是由石榴石核确定的,它对应着逆冲推覆作用引起的地壳加厚及随后一个阶段的剥蚀抬升。由石榴石边缘部分确定的第二条曲线是由NNW向同斜褶皱所表现出的地壳均匀加厚作用引起的。这一事件的峰期条件解释为与Harney峰s型花岗岩的深熔作用、穹起作用及侵位有关。

关键词：地体热演化 P-T-t轨迹早元古宙

维普期刊数据库

Wide-Range Control of Output Voltage in Z-source Inverter by Neural Network

在线全文

学校读者我要写书评

暂无评论

Wide-Range Control of Output Voltage in Z-source Inverter by...

Occurrence of Cassava Mosaic Begomovirus New species and Ageratum Leaf Curl Cameroon Virus on Pepper(Capsicum annuum L.)in Togo

第11届国际电机与系统学术会议

作者： M.J.Rastegar Fatemi s.Mirzakuchaki s.M.J.Rastegar Fatemi Islamic Azad University of saveh Branch/Department of Electrical Engineering Saveh39187-366Iran Iran University of science and Technology/Department of Electrical Engineering Tehran16846Iran University of Picardie“Jules verne”/Department of Electrical Engineering Amiens80000France

＜正＞Z-source inverters have recently been proposed as new power conversion concept as they have both voltage buck and boost features.A unique impedance network between the power source and converter circuit provides both voltage buck and boost properties,which cannot be achieved with conventional voltagesource and current-source *** paper presents a neural network control system that control Z-source inverter output in the form of *** peak ac output voltage is able to be control from 93～*** controller provides Kp and Ki parameters for PI controller in this inverter in order to wide-range *** harmonic of output voltage can be reduced and the precise of output voltage can be increased by using neural controller and the new method of modulation.

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Agricultural sciences 2019年第5期10卷 671-682页

作者： Kodjovi Atassé Dansou-Kodjo Assion sétu Mivedor Kossikouma Djodji Adjata Jérome Duclercq Yawovi Mawuena Dieudonné Gumedzoe Laboratory of Plant Virology and Biotechnology(LVBV) Ecole Supérieure d’Agronomie(ESA)University of LomeLoméTogo Laboratory of Agroecology Ecophysiology and Integrative Biology(AEB)Unit EDYSAN FRE 3498 CNRS/University of Picardie Jules VerneAmiensFrance

Cassava mosaic disease caused by the whitefly-transmitted begomoviruses (family Geminiviridae) is a major threat to cassava (Manihot esculenta Crantz) production, which can be intercropped with other plants such as pepper (Capsicum annuum L.). The aim of this study is to identify cassava begomoviruses on other crops in cassava intercropping systems. Thus, foliar samples showing typical symptoms of virus diseases in cassava intercropping systems were collected from pepper and submitted to PCR analysis and direct sequencing. Three begomovirus species ACMV, EACMV and ALCCMV were identified and characterized in samples. Isolates of these species shared respectively 90% - 93%, 74% and 80% nucleotide identities with begomoviruses. These findings show that cassava begomoviruses can infect other crops and will help in understanding the epidemiology related to whitefly-transmitted begomoviruses in cassava intercropping systems.

关键词： ACMV ALCCMV Begomovirus EACMV Pepper sequencing

Growth,structural and Optical Characterization of se_(75)Te_(17)Ge_8 Thin Films

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

Journal of the Chinese Ceramic society 2015年第2期2卷 98-102页

作者： sALIM s M LAHMAR A ZAYIED H sALEM A M sAKR G B BARROY P TELEB N EL MARssI M Electron Microscope and Thin Films Department National Research Center Laboratoire de Physique de La Matiére Condensée Université de Picardie Jules Verne Physics Department College of Girls for ArtsScience and EducationUniversity of Ain Shams Physics Department-University College-Umm Al-Qura University-saudi Arabia Kingdom Physics Department Faculty of EducationUniversity of Ain Shams

se75Te17Ge8 thin film was processed on glass substrates by a pulsed laser deposition technique. The ceramic target used for the deposition was prepared by a solid state sintering method in a vacuum sealed silica tube. The structural characterization was investigated by X-ray diffraction coupled with energy-dispersive X-ray spectrometry. The optical parameters were determined from the transmittance and reflectance spectra of the prepared film. The Wemple and Di Domenico models both were appropriate to describe the experimental results. The optical absorption coefficient was analyzed to identify the type of the optical transition and determine the corresponding energy values.

关键词： pulse laser deposition thin films amorphous semiconductors optical spectroscopy

维普期刊数据库