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Excess and Radiogenic Argon in High-Pressure Mylonites of the Tan-Lu Fault Zone, Eastern China

Acta Geologica Sinica(English Edition) 2008年第1期82卷 84-98页

作者： XIE Chenglong zhu Guang wang Yongshen HU Zhaoqi School of Resource and Environment Engineering Hefei University of Technology Hefei Anhui 230009

Bulk separates of porphyroclastic phengite, neoformed phengite and their mixtures from the Tan-Lu HP mylonites overprinted on the Sulu UHP rocks were analyzed with the 40Ar/39Ar step heating method. Two samples of the neoformed phengite from ultramylonite give 40Ar/39Ar plateau ages of 209.9±1.8 Ma and 214.3±1.8 Ma, which are interpreted as representing cooling times of the TanLu sinistral faulting, and provide geochronological evidence for the syn-orogenic faulting of the Tan-Lu fault zone. The results show that the phengite formed during the retrograde eclogite-facies mylonitization was not contaminated with excess argon and can be used for dating the deformation. Argon closure in previous K-bearing minerals with excess argon under a retrograde HP dry condition is considered to be the reason for lack of excess argon incorporation in the neoformed phengite. Five porphyroclastic phengite samples yield 40Ar/39Ar plateau ages ranging from 666±12 Ma to 307.1±3.3 Ma, which are interpreted as being contaminated with excess argon. Two mixture samples with plateau ages of 239.4±2.1 Ma and 239.3±2.0 Ma show upward-convex age spectra caused by the mixture of older porphyroclastic phengite with excess argon incorporation and younger neoformed phengite without excess argon incorporation. It is demonstrated that excess argon introduced from the previous UHP metamorphism is still preserved in the pre-existing phengite after the Tan-Lu eclogite-facies mylonitization. The intense deformation under HT and HP conditions cannot erase excess argon in the previous phengite totally due to restricted fluid activities. These porphyroclastic phengite previously contaminated with excess argon cannot be used for dating the later HP deformation. This indicates that deformation under a HP dry condition does not play an important role in removing previous 40Are in phengite.

关键词： excess argon phengite mylonite Tan-Lu fault zone 40Ar/39Ar dating

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A Second-Order Implicit-Explicit Scheme for the Baroclinic-Barotropic Split System of Primitive Equations

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Communications in Computational Physics 2023年第10期34卷 1306-1331页

作者： Rihui Lan Lili Ju zhu wang Max Gunzburger School of Mathematical Sciences Ocean University of ChinaQingdaoShandong 266100China Department of Mathematics University of South CarolinaColumbiaSC 29208USA Oden Institute for Computational Engineering and Sciences University of Texas at AustinAustinTexas 78712USA

The baroclinic-barotropic mode splitting technique is commonly employed in numerical solutions of the primitive equations for ocean modeling to deal with the multiple time scales of ocean *** this paper,a second-order implicit-explicit(IMEX)scheme is proposed to advance the baroclinic-barotropic split ***,the baroclinic mode and the layer thickness of fluid are evolved explicitly via the second-order strong stability preserving Runge-Kutta scheme,while the barotropic mode is advanced implicitly using the linearized Crank-Nicolson *** each time step,the baroclinic velocity is first computed using an intermediate barotropic *** barotropic velocity is then corrected by re-advancing the barotropic mode with an improved barotropic ***,the layer thickness is updated by coupling the baroclinic and barotropic velocities *** addition,numerical inconsistencies on the discretized sea surface height caused by the mode splitting are alleviated via a reconciliation process with carefully calculated flux *** truncation error is also analyzed to validate the second-order accuracy of the ***,two benchmark tests from the MPAS-Ocean platform are conducted to numerically demonstrate the performance of the proposed IMEX scheme.

关键词： Primitive equations baroclinic-barotropic splitting implicit-explicit strong stability preserving RK SSH reconciliation

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A selective area growth double stack active layer electroabsorption modulator integrated with a distributed feedback laser

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Chinese Science Bulletin 2009年第20期54卷 3627-3632页

作者： zhu HongLiang LIANG Song ZHAO Ling Juan KONG DuanHua zhu NingHua wang Wei Key Laboratory of Semiconductor Materials Institute of Semiconductor Chinese Academy of Sciences Beijing 100083 China

A new method for fabricating electroabsorption modulator integrated with a distributed feedback laser(EML) was *** the method we fabricated a selective area growth double stack active layer EML(SAG-DSAL-EML).Through comparing with other fabrication methods of EMLs,the characters and the merits of the new method presented in this paper were discussed.

关键词：分布反馈激光器电吸收调制器选择区域生长有源层集成堆积 EML 制备方法

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Optomechanically induced transparency in a spinning resonator

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Photonics Research 2017年第4期5卷 367-371页

作者： HAO Lü YAJING JIANG YU-zhu wang HUI JING Key Laboratory for Quantum Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences University of Chinese Academy of Sciences Department of Physics Henan Normal University Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University

We study optomechanically induced transparency in a spinning microresonator. We find that in the presence of rotation-induced Sagnac frequency shift, both the transmission rate and the group delay of the signal are strongly affected, leading to a Fano-like spectrum of transparency. In particular, tuning the rotary speed leads to the emergence of nonreciprocal optical sidebands. This indicates a promising new way to control hybrid light–sound devices with spinning resonators.

关键词： rate

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Magnetic Properties of Ferromagnetic Double Layers with Ferrimagnetic Interlayer Coupling at Zero Temperature

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Communications in Theoretical Physics 2009年第2期51卷 349-352页

作者： JIANG Wei zhu Cheng-Bo wang Wei ZHANG Fan College of Sciences Shenyang University of Technology Shenyang 110023 China

Spin-wave theory is used to study magnetic properties of ferromagnetic double layers with a ferrimagnetic interlayer coupling at zero temperature. The spin-wave spectra and four sublattices magnetizations and internal energy are calculated by employing retarded Green function technique. The sublattice magnetizations at ground state are smaller than their classical values, owing to the zero-point quantum fluctuations of the spins.

关键词： spin-wave theory ferromagnetic double layers zero-point quantum fluctuation ferrimagnetic interlay coupling

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VUV luminescence properties of Y_(0.95)Eu_(0.05)PO_4 phosphor derived by a modified solid-state route

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Rare Metals 2008年第4期27卷 354-357页

作者： ZHENG Cuihong zhu Weichang wang Lu School of Materials Science and Engineering and Anhui Key Laboratory of Metal Materials and Processing Anhui University of Technology Ma ＇anshan 243002 China

A modified solid-state route was attempted to prepare Y0.95 Eu0.05PO4 PDP phosphor, involving milling a powdered mixture of YCl3, EuCl3, and （NH4）2HPO4 and calcining the milling-derived precursor. The thermal decomposition behavior of the milling-derived precursor was investigated by thermogravimetric analysis （TGA）. Phase compositions, morphologies, and luminescence properties of the prepared phosphor powder were characterized by X-ray diffraction （XRD）, scanning electron microscope （SEM）, and vacuum ultraviolet （VUV） emission spectra, respectively. The results indicated that the Y0.95Eu0.05PO4 phosphor powder obtained at a calcination temperature of 900℃ was xenotime-structured. The phosphor powder particles were uniform and spherical-shaped with a primary particle size of-200 um. In comparison with that derived by the conventional solid-state route, the phosphor powder prepared by the modified solid-state route exhibited a higher color purity, presenting a predominant emission peak at 619 nm under 147 um VUV excitation.

关键词： phosphor luminescence properties vacuum ultraviolet solid-state reaction

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Exposure Assessment of Sb2O3 in PET Food Contact Materials

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Biomedical and Environmental Sciences 2016年第4期29卷 305-313页

作者： zhu Lei wang zhu Tian XU Hai Bin SUN Ru Bao ZHANG Hong ZHANG Jian Bo China National Centre for Food Safety Risk Assessment Beijing 100022 China Institute of Disease Control and Prevention Academy of Military Medical Science Beijing 100071 China

This study was conducted to do exposure assessment of the possible migration of antimony trioxide （Sb203） from Polyethylene terephthalate （PET） food contact materials （FCM）. Consumption Factor （CF） and Food-type Distribution Factor （fT） were calculated from survey data with reference to the US FDA method. The most conservative migration conditions were obtained by testing Sb migration from PET FCM based on the Chinese national standard of GB/T 5009.101-2003[1].

关键词： PET Exposure Assessment of Sb2O3 in PET Food Contact Materials FCM Sb

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Variation characteristics of heavy metals and nutrients in the core sediments of Taihu Lake and their pollution history

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Science China Earth Sciences 2006年第Z1期49卷 82-91页

作者： LIU Enfeng SHEN Ji LIU Xingqi zhu Yuxin wang Sumin Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China Nanjing Institute of Geography & Limnology Chinese Academy of Sciences Nanjing 210008 China

The sedimentary environment change, trophic evolution and heavy metals pollution history of the northern Taihu Lake in the last 100 years are studied according to the sedimentary geochemical proxies of the core sediments, such as grain size, nutrients, heavy metals, diatom, etc. The nutrients in the sediments depended mainly on the lake internal circulation and the heavy metals were from natural geogenic sources before the 1920s, which were not influenced by human activities generally, and grain size was one of the key factors influencing heavy metals content in the *** alternation of manner and strength of human activities in Taihu Lake catchment before and after the 1920s made the lake sediments coarser, and hence heavy metals and TP content decreased contrasted with that before the 1920s. TP content in sediments and water increased from the 1950s to late 1970s due to anthropogenic pollutants discharge, and the lake belonging to mesotrophic *** and TOC content and C/N ratio increased due to the increasing external pollutants into Taihu Lake by human activities, TP content also increased obviously in water and sediments, and the diatom association was dominated by eutrophic species since the late 1970s, indicating the eutrophication state of Taihu Lake in this period. Meanwhile the increasing in heavy metals content, such as Cu, Mn,Ni, Pb and Zn, and their proportion of valid fractions in the sediments indicates that they all result from human pollutants since the late 1970s. The heavy metals in the surface sediments have certain potential biological toxicity due to the higher SEM/AVS ratio.

关键词： sediments, heavy metals, nutrients, human activities, pollution history, Taihu Lake.

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A highly selective electrochemical impedimetric sensor for imidacloprid determination based on WO_(3)/MoS_(2)nanosheets/molecularly imprinted polymer composite

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Rare Metals 2024年第3期43卷 1309-1315页

作者： Long-Hua Ding Ya-Wen wang Qiu-Wen Li Li-Li Zhang Ai-zhu wang Institute for Advanced Interdisciplinary Research School of Chemistry and Chemical EngineeringUniversity of JinanJinan250022China HCA Florida Healthcare Westside/Northwest Hospital Internal Medicine PlantationFL33324USA

In this study,an electrochemical impedimetric sensor was established for imidacloprid(IMI)detection based on WO_(3)/MoS_(2)and molecular imprinted polymer(MIP)*** layer was prepared on electrode surface by electropolymerization of o-phenylenediamine(o-PD)in the presence of IMI template,which ensured the specific rec-ognization toward IMI.

关键词： electrochemical polymer polymerization

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Study of the Transient Reactive Pd(Ⅳ) Intermediate in the Pd(OAc)2-Catalyzed Oxidative Coupling Reaction System by Electrospray Ionization Tandem Mass Spectrometry

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Chinese Journal of Chemistry 2013年第3期31卷 371-376页

作者： Wei zhu Haoyang wang Haihui Peng Guosheng Liu Yinlong Guo Shanghai Mass Spectrometry Center Shanghai Institute of Organic Chemistry Chinese Academy of Sciences Shanghai 200032 China

Pd-catalyzed oxidative coupling reaction was of great importance in the aromatic C--H activation and the for-mation of new C-O and C--C bonds. Sanford has pioneered practical, directed C-H activation reactions em-ploying Pd（OAc）2 as catalyst since 2004. However, until now, the speculated reactive Pd（Ⅳ） transient intermedi-ates in these reactions have not been isolated or directly detected from reaction solution. Electrospray ionization tandem mass spectrometry （ESI-MS/MS） was used to intercept and characterize the reactive Pd（Ⅳ） transient inter-mediates in the solutions of Pd（OAc）2-catalyzed oxidative coupling reactions. In this study, the Pd（IV） transient in-termediates were detected from the solution of Pd（OAc）2-catalyzed oxidative coupling reactions by ESI-MS and the MS/MS of the intercepted Pd（IV） transient intermediate in reaction system was the same with the synthesized au-thentic Pd（Ⅳ） complex. Our ESI-MS（/MS） studies confirmed the presence of Pd（Ⅳ） reaction transient intermedi-ates. Most interestingly, the MS/MS of Pd（Ⅳ） transient intermediates showed the reductive elimination reactivity to Pd（Ⅱ） complexes with new C-O bond formation into product in gas phase, which was consistent with the proposed reactivity of the Pd（Ⅳ） transient intermediates in solution.

关键词： electrospray ionization tandem mass spectrometry (ESI-MS/MS) Pd(IV) transient intermediate oxi^dative coupling reaction

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