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A Strong Stability-Preserving Predictor-Corrector Method for the Simulation of Elastic Wave Propagation in Anisotropic Media

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Communications in Computational Physics 2012年第9期12卷 1006-1032页

作者： D.H.Yang n.wang E.Liu Department of Mathematical Sciences Tsinghua UniversityBeijing 100084P.R.China Department of Geophysics China University of Mining and TechnologyXuzhouJiangsu ProvinceP.R.China

In this paper,we propose a strong stability-preserving predictor-corrector(SSPC)method based on an implicit Runge-Kutta method to solve the acoustic-and elastic-wave *** first transform the wave equations into a system of ordinary differential equations(ODEs)and apply the local extrapolation method to discretize the spatial high-order derivatives,resulting in a system of semi-discrete *** we use the SSPC method based on an implicit Runge-Kutta method to solve the semi-discrete ODEs and introduce a weighting parameter into the SSPC *** top of such a structure,we develop a robust numerical algorithm to effectively suppress the numerical dispersion,which is usually caused by the discretization of wave equations when coarse grids are used or geological models have large velocity contrasts between adjacent ***,we investigate the performance of the SSPC method including numerical errors and convergence rate,numerical dispersion,and stability criteria with different choices of the weighting parameter to solve 1-D and 2-D acoustic-and elastic-wave *** the SSPC is applied to seismic simulations,the computational efficiency is also investigated by comparing the SSPC,the fourth-order Lax-Wendroff correction(LWC)method,and the staggered-grid(SG)finite *** of synthetic waveforms computed by the SSPC and analytic solutions for acoustic and elastic models are given to illustrate the accuracy and the validity of the ***,several numerical experiments are conducted for the geological models including a 2-D homogeneous transversely isotropic(TI)medium,a two-layer elastic model,and the 2-D SEG/EAGE salt *** results show that the SSPC can be used as a practical tool for large-scale seismic simulation because of its effectiveness in suppressing numerical dispersion even in the situations such as coarse grids,strong interfaces,or high frequencies.

关键词： SSPC method seismic wavefield modeling anisotropy numerical dispersion shearwave splitting

Introduction to the special topic on nanomanufacturing

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Microsystems & nanoengineering 2017年第1期3卷 114-115页

作者： Eric M.Yeatman Hannah M.Gramling Evelyn n.wang Fellow of the Royal Academy of Engineering and Professor Electrical and Electronic EngineeringImperial College LondonSouth Kensington CampusLondon SW72AZUK Mechanical Engineering University of California BerkeleyBerkeleyCA 94720USA Professor Mechanical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA 02139USA

The semiconductor industry introduced sub-100-nanometer technology to consumers more than a decade ago,in the early *** field of‘nanotechnology’has since expanded rapidly,drawing on methods and materials from integrated electronics while adding many others,such as quantum dots,nanowires and self-assembly,and targeting applications in optoelectronics,biomedical devices,sensors,fluidics and many other *** isolation of monolayer graphene in 2004,in particular,initiated a massive worldwide research effort in 2D *** the volume of papers published in the realm of nanotechnology continues to balloon year-on-year,surprisingly few of the technologies—which are frequently deemed to hold particular promise—have found their way to commercialization.

关键词： nanowires expanded initiated

nanoporous membrane device for ultra high heat flux thermal management

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Microsystems & nanoengineering 2018年第1期4卷 474-483页

作者： Daniel F.Hanks Zhengmao Lu Jay Sircar Todd R.Salamon Dion S.Antao Kevin R.Bagnall Banafsheh Barabadi Evelyn n.wang Massachusetts Institute of Technology 77 Massachusetts AvenueCambridgeMA 02139USA nokia Bell Labs 600 Mountain AvenueNew ProvidenceNJ 07974USA

High power density electronics are severely limited by current thermal management solutions which are unable to dissipate the necessary heat flux while maintaining safe junction temperatures for reliable *** designed,fabricated,and experimentally characterized a microfluidic device for ultra-high heat flux dissipation using evaporation from a nanoporous silicon ***~100 nm diameter pores,the membrane can generate high capillary pressure even with low surface tension fluids such as pentane and *** suspended ultra-thin membrane structure facilitates efficient liquid transport with minimal viscous pressure *** fabricated the membrane in silicon using interference lithography and reactive ion etching and then bonded it to a high permeability silicon microchannel array to create a biporous wick which achieves high capillary pressure with enhanced *** back side consisted of a thin film platinum heater and resistive temperature sensors to emulate the heat dissipation in transistors and measure the temperature,*** experimentally characterized the devices in pure vaporambient conditions in an environmental ***,we demonstrated heat fluxes of 665±74 W/cm^(2) using pentane over an area of 0.172mm×10mm with a temperature rise of 28.5±1.8 K from the heated substrate to ambient *** heat flux,which is normalized by the evaporation area,is the highest reported to date in the pure evaporation regime,that is,without nucleate *** experimental results are in good agreement with a high fidelity model which captures heat conduction in the suspended membrane structure as well as non-equilibrium and sub-continuum effects at the liquid–vapor *** work suggests that evaporative membrane-based approaches can be promising towards realizing an efficient,high flux thermal management strategy over large areas for high-performance electronics.

关键词： high thermal ambient

Development of a 750-mm-long stripline kicker for HEPS

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Radiation Detection Technology and Methods 2018年第2期2卷 121-127页

作者： H.Shi J.H.Chen L.wang n.wang L.H.Huo G.W.wang P.Liu X.L.Shi Key Laboratory of Particle Acceleration Physics and Technology Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China University of Chinese Academy of Sciences Beijing 100049China

Purpose The superfast kickers are required for the HEPS storage ring on-axis injection system due to its very small dynamic aperture.A 750-mm-long stripline pair type of kicker prototype was researched and developed to demonstrate achieved performance of bandwidth,impedance,kicker strength,field uniformity and beam power *** The cross sections of the kicker main body and the end of taper part are optimized for a good impedance matching and field uniformity.3D simulation further optimizes the taper part to minimize the beam power loss and maintain a lower *** high-voltage feedthrough is also designed and optimized by 3D *** and high-voltage measurements are taken to verify the design of kicker *** The testing transmission odd-mode impedance is 50±0.5Ω,the even-mode impedance is 60±0.5Ω,and return loss is less than−13 *** peak voltage and the rise time of pulse width inserting kicker assembly just decrease 3%of 20 kV and slow down 80 ps,*** RF testing results agree well with the simulation ones,which meet the design *** kicker assembly works well at±20 kV pulse.

关键词： Stripline kicker Feedthrough On-axis swap-out injection Odd-mode(even-mode)impedance Storage ring

Research developments and energy-saving influencing factors of insulating glass and structural-function integration

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Research developments and energy-saving influencing factors ...

TEIM2015第六届无机材料结构、性能及测试表征技术研讨会

作者： J.Zhou n.wang D.C.Xie 中国建材检验认证集团股份有限公司

Insulating glass is the main functional material of the building curtain wall and building windows and doors,which plays a significant role in the energy-saving function and can save more than 50%of the whole building energy *** recent years,the thermal insulating property and sound insulating property of insulating glass have been improved greatly with the combination of vacuum *** the combination of PV(photovoltaic)glass,insulating glass has structural-function integration *** paper summarized some latest research developments of insulating glass and structural-function *** analyzing the energy-saving test data of insulating glass and structural-function integration,the energy-saving test influencing factors were given.

关键词： Research developments and energy-saving influencing factors of insulating glass and structural-function integration

Rapid mapping and cloning the chlorina mutant gene(cn-A1) in wheat by bulked segregant analysis and 660K SnP Chip

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Rapid mapping and cloning the chlorina mutant gene(cn-A1) in...

第十届全国小麦基因组学及分子育种大会

作者： H.B.Jiang n.wang C.J.wang C.S.wang Y.Z.Xie State Key Laboratory of Crop Stress Biology for Arid Areas College of AgronomyNorthwest A&F University

Wheat is one of the most widely grown crops in the *** mutations have been used to generate mutants for genetic improvement and functional genomics in ***,huge advances in wheat genome sequencing have contributed to the use of single-nucleotide polymorphism(SnP) in fine mapping and map-based cloning of mutant genes.A chlorina mutant in Triticum aestivum was obtained by treatment with the chemical mutagen sodium *** analysis confirmed that the mutant phenotype was controlled by a recessive gene,which was designated as *** applying bulked segregant analysis and Wheat 660 K SnP chip,the cn-Al gene was mapped to chromosome 7 AL,and 11 polymorphic markers were *** mapping showed that cn-Al is located in a 1.1-cM genetic region flanked by KASP markers 660 K-7 A12 and 660 K-7 A20,which corresponds to a physical interval of 3.48 Mb in the Chinese Spring chromosome 7 AL containing 47 predicted *** analysis showed that a point mutation occurred in the AAA+conserved region of Magnesium chelatase Ⅰ subunit(CHLI) generated an amino acid substitution,which led to chlorine phenotype of the *** approach using in this study provides a paradigm for the rapid mapping and cloning of the mutant genes underlying the genetic traits in wheat

关键词： Triticum aestivum Bulked segregant analysis Chlorina SnP array KASP markers

Excellent cyclic performance of Fe2O3/C/SnO2 anode material for lithium-ion batteries

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Excellent cyclic performance of Fe2O3/C/SnO2 anode material ...

中国化学会第三届中国能源材料化学研讨会

作者： X.M.wang Q.Zhang X.F.Shi Y.n.Yu Y.J.Chai n.wang College of Chemistry and Materials Science Hebei Normal University Analysis and Testing Centre Hebei Normal University

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Rapid Growth and Magnetic Properties of Fe7Co3 Intermetallic Compound

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Rapid Growth and Magnetic Properties of Fe7Co3 Intermetallic...

2012 International Conference on Mechanical Engineering and Materials(ICMEM 2012)

作者： Y.Y.Zhang W.J.Yao W.Sun J.Y.wang X.J.Han n.wang Department of Applied Physics Northwestern Polytechnical University School of Materials Science Shanghai Jiaotong University

By drop tube and melt spinning techniques,rapid growth of Fe7Co3 intermetallic compound has been *** microstructures and nucleation characteristics under different cooling rates are *** the increase of cooling rate,Fe7Co3 intermetallic compound grains are refined in both rapid growth *** observation and theoretical analysis indicate that the nucleation rate in single-roller quenching is much greater than that in free-fall method when the cooling rate is under a same *** comparison of magnetic property between the alloy ribbons and other dimensional magnetic material were *** superior soft magnetic properties of Fe-Co alloy ribbons changes sensitively with the cooling rate,which is mainly decided by the wheel velocity.

关键词： Intermetallic Rapid solidification Microstructure Magnetic

Bone Morphogenetic Protein (BMP) signaling in development and human diseases

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Genes & Diseases 2014年第1期1卷 87-105页

作者： Richard n.wang Jordan Green Zhongliang wang Youlin Deng Min Qiao Michael Peabody Qian Zhang Jixing Ye Zhengjian Yan Sahitya Denduluri Olumuyiwa Idowu Melissa Li Christine Shen Alan Hu Rex C.Haydon Richard Kang James Mok Michael J.Lee Hue L.Luu Lewis L.Shi The University of Chicago Pritzker School of Medicine ChicagoIL 60637USA Molecular Oncology Laboratory Department of Orthopaedic Surgery and Rehabilitation MedicineThe University of Chicago Medical CenterChicagoIL 60637USA Departments of Orthopaedic Surgery Medicineand Gynecologythe Affiliated Hospitals of Chongqing Medical UniversityChongqing 400016China School of Bioengineering Chongqing UniversityChongqingChina

Bone Morphogenetic Proteins(BMPs)are a group of signaling molecules that belongs to the Transforming Growth Factor-b(TGF-b)superfamily of *** discovered for their ability to induce bone formation,BMPs are now known to play crucial roles in all organ *** are important in embryogenesis and development,and also in maintenance of adult tissue *** knockout models of various components of the BMP signaling pathway result in embryonic lethality or marked defects,highlighting the essential functions of *** this review,we first outline the basic aspects of BMP signaling and then focus on genetically manipulated mouse knockout models that have helped elucidate the role of BMPs in development.A significant portion of this review is devoted to the prominent human pathologies associated with dysregulated BMP signaling.

关键词： BMP signaling Development Genetics Mouse knockout Pathogenesis Signal transduction