检索结果-南通市图书馆

Journal of Earth Science 2020年第3期31卷 425-446页

作者： Gelareh Rahimi Hans-Joachim Massonne fakultat chemie Universitat Stuttgart70569 StuttgartGermany School of Earth Sciences China University of GeosciencesWuhan 430074China

A chloritoid-garnet-bearing micaschist from the southern part of the Elstergebirge was studied to better understand the Variscan orogenic evolution in the Saxothuringian zone of the northwestern Bohemian *** on the textural relations and compositions of minerals,especially of zoned garnet and potassic white mica,a P-T path was reconstructed using contoured P-T *** U-Th-Pb dating of monazite in the micaschist was undertaken with the electron *** micaschist experienced P-T conditions along a clockwise path between 16 kbar at 510℃and 5 kbar at 555℃followed by isobaric heating to about 600℃.Monazite ages range between 315 and 480 Ma with the most prominent maxima and side maxima at 346.0±1.1(2σ),357.3±2.3,and 368.3±1.7 *** older than 380 Ma were related to detrital monazite pointing to a Devonian sedimentary *** ages around 325 Ma were assigned to the isobaric heating by nearby post-tectonic *** high-pressure event,being the result of the collision of Laurussia and Gondwana after closure of the Rheic Ocean,occurred in the Late *** exhumation to 15-20 km(5 kbar)ended probably in the Early *** high-pressure micaschists from the Fichtelgebirge to the Erzgebirge crystalline complexes are suggested to represent a single nappe within a metamorphic nappe *** nappe is composed of metasedimentary slices,which experienced different peak pressures rather than representing a coherent crustal section.

关键词： Saxothuringian micaschist chloritoid garnet monazite dating Variscan P-T path

Self-diffusion coefficients of organic solvents in linear and branched high density polyethylene particles measured by PFG NMR

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第1期19卷 110-114页

作者： Xiao Wei Yan Xiao Hong Ren Siegfried Stap Jing Dai Wang Yong Rong Yang Department of Chemical Engineering Zhejiang University Hangzhou 310027 China FG Technische Physik ll/Polymerphysik Fakultat fiir Mathematik und Naturwissenschaften Technische Universitiit Ilmenau Postfach 100565 D-98684 Ilmenau Germany Institut fiir Technische chemie und Makromolekulare chemie RWTH Aachen University Worringerweg 1 D-52056 Aachen Germany

Pulsed field gradient nuclear magnetic resonance （PFG NMR） has been performed to study the diffusion of organic solvents into semicrystalline polyethylene particles. Self-diffusion coefficients in different domains of the sample can be extracted through a bi- exponential fit to the echo intensity attenuation, which allows the precise determination of the tortuosity of the polyethylene particles. Further exploration comes from the measurements with branched polyethylene particles and it was found that the diffusion in polymer phase contributed significantly to the slow component of the exponential decay curve. 2007 Jing Dai Wang. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.

关键词： Self-diffusion coefficients Pulsed field gradient NMR Tortuosity Polyethylene particle

三正丁基膦稳定的铜(Ⅰ)β-二酮配合物的合成、表征以及作为前驱物用化学汽相沉积法生长铜膜(英文)

在线全文

学校读者我要写书评

暂无评论

无机化学学报 2004年第11期20卷 1257-1264页

作者：沈应中 Marion Leschke Stefan E. Schulz Ramona Ecke Thomas Gessner Heinrich Lang Technische Universitt Chemnitz Fakultat für Naturwissen-schaften Institut für Chemie Lehrstuhl Anorganische Chemie Straae der Nationen 62 09111 Chemnitz Germany Technische Universitat Chemnitz Fakultat fü Elektrotechnik und Informationstechnik Zentrum fü Mikrotechnologien Reichenhainer Straae 70 09126 Chemnitz Germany

合成了一系列三正丁基膦辅助配体稳定的铜髣β鄄二酮配合物,对合成的配合物用元素分析、红外、核磁共振以及热重和差热等手段进行了表征。筛选出性能优良的配合物为前驱物用化学汽相沉积(CVD)的方法生长出金属铜膜,用SEM和EDX等手段对... 详细信息

合成了一系列三正丁基膦辅助配体稳定的铜髣β鄄二酮配合物,对合成的配合物用元素分析、红外、核磁共振以及热重和差热等手段进行了表征。筛选出性能优良的配合物为前驱物用化学汽相沉积(CVD)的方法生长出金属铜膜,用SEM和EDX等手段对生长的铜膜进行了表征。

关键词：三正丁基膦铜配合物 β-二酮合成前驱物化学汽相沉积法铜膜热分析扫描电镜 ×-射线能量散射

Chapter model systems in heterogeneous catalysis at the atomic level: a personal view

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2020年第4期63卷 426-447页

作者： Hans-Joachim Freund Markus Heyde Helmut Kuhlenbeck Niklas Nilius Thomas Risse Thomas Schmidt Shamil Shaikhutdinov Martin Sterrer Fritz Haber Institute of the Max Planck Society Faradayweg 4-6Berlin D-14195Germany fakultat V-Mathematik und Naturwissenschaften Carl von Ossietzky Universitat OldenburgGermany Institut fur chemie und Biochemie Freie UniversitatBerlinGermany Institute of Physics University of GrazGrazAustria

The review presents an overview of studies in the surface science of oxide and related surfaces with an emphasis of the studies performed in the authors’ group. Novel instruments and technique developments, as well as their applications are reported, in an attempt to cover studies on model systems of increasing complexity, including some of the key ingredients of an industrially applied heterogeneous catalyst and its fabrication. The review is intended to demonstrate the power of model studies in understanding heterogeneous catalysis at the atomic level. The studies include those on supported nano-particles, both, prepared in vacuum and from solution, interaction of surfaces and the underlying bulk with molecules from the gas phase, strong metal support interaction, as well as the first attempt to include studies on reactions in confined spaces.

关键词： model catalysts oxide surfaces structure and spectroscopy supported nanoparticles reactions in the confined space