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Modeling ocean wave propagation under sea ice covers

丛书名： Arth.itis and arth.oplasty series

2010年

作者： edited by Francis h. shen Ch.istoph.r I. Sh.ffrey.

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Acta Mech.nica Sinica 2015年第1期31卷 1-15页

作者： Xin Zh.o h.yley h. shen Sukun Ch.ng Department of Civil and Environmental Engineering Clarkson University

Operational ocean wave models need to work globally, yet current ocean wave models can only treat ice covered regions crudely. Th. purpose of th.s paper is to provide a brief overview of ice effects on wave propagation and different research.meth.dology used in studying th.se effects. Based on its proximity to land or sea, sea ice can be classified as： landfast ice zone, sh.ar zone, and th. marginal ice zone. All ice covers attenuate wave energy. Only long swells can penetrate deep into an ice cover. Being closest to open water, wave propagation in th. marginal ice zone is th. most complex to model. Th. ph.sical appearance of sea ice in th. marginal ice zone varies. Grease ice, pancake ice, brash.ice, floe aggregates, and continuous ice sh.et may be found in th.s zone at different times and locations. Th.se types of ice are formed under different th.rmalmech.nical forcing. Th.re are th.ee classic models th.t describe wave propagation th.ough.an idealized ice cover： mass loading, th.n elastic plate, and viscous layer models. From ph.si cal arguments we may conjecture th.t mass loading model is suitable for disjoint aggregates of ice floes much.smaller th.n th. wavelength. th.n elastic plate model is suitable for a con tinuous ice sh.et, and th. viscous layer model is suitable for grease ice. For different sea ice types we may need different wave ice interaction models. A recently proposed viscoelas tic model is able to synth.size all th.ee classic models into one. Under suitable limiting conditions it converges to th. th.ee previous models. Th. complete th.oretical framework for evaluating wave propagation th.ough.various ice covers need to be implemented in th. operational ocean wave models. In th.s review, we introduce th. sea ice types, previous wave ice interaction models, wave attenuation mech.nisms,th. meth.ds to calculate wave reflection and transmission between different ice covers, and th. effect of ice floe breaking on sh.ping th. sea ice morph.logy. Labora

关键词： Ocean waves Sea ice Cryosph.ric ch.nge

STUDY ON TEMPERATURE FIELD INDUCED IN h.Gh.FREQUENCY INDUCTION h.ATING

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Acta Metallurgica Sinica(English.Letters) 2006年第3期19卷 190-196页

作者： h. shen Z.Q. Yao Y.J. Sh. J. h. Sch.ol of Mech.nical Engineering Shanghai Jiaotong University Shanghai 200030 China

A math.matical model was establish.d for th. temperature field developed during h.gh.frequency induction h.ating （h.Ih. by Maxwell＇s equations. It required solving th. coupled equations of th. electromagnetic and temperature fields. Th. numerical simudation was performed using FEMLAB. Th. comparison of th. calculations using th. proposed model with.experimental results sh.wed a very good correlation. Th. effects of th. h.ating parameters in h.gh.frequency induction such.as th. distance between th. plate and th. coil, th. applied current, th. frequency, and th. turns of th. coil on th. temperature profiles developed in th. plate were also discussed using th. establish.d model.

关键词： h.gh.frequency induction temperature field numerical simudation

NUMERICAL INVESTIGATION OF STRAIGh.-LINE LASER FORMING UNDER Th. TEMPERATURE GRADIENT MECh.NISM

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Acta Metallurgica Sinica(English.Letters) 2006年第2期19卷 144-150页

作者： Y.J. Sh. h. shen Z.Q. Yao J. h. Sch.ol of Mech.nical and Power Engineering Shanghai Jiaotong University Shanghai 200030 China

Laser forraing is a new flexible and dieless forming tech.ique. To ach.eve th. h.gh.accuracy forming, th. temperature gradient mech.nism （TGM） is studied. In th. analysis of TGM, th. plate bends about x-axis and about y-axis as well. To understand th. deformation trend, th. numerical simulation of deformation of plate is conducted by ch.osing different laser powers, laser spot diameters, scanning speeds, length., width. and th.cknesses. From th. results of simulation, it can be seen th.t th. laser spot diameter, th. scanning speed, laser power and th.ckness of plate play dominant roles in th. laser forming process. h.wever, th. bending angles αx and αy sh.w different trends with.th. variation of parameters. In addition, in comparison with.above four parameters, th. effect of length.and width.of plate on th. beading angle may be neglected, but th.ir effects are significant for th. bending radius R.

关键词： laser forming temperature gradient mech.nism metal plate

STUDY ON Ni-Cr SYSTEM SOLAR SELECTIVE Th.N FILMS PREPARED BY MAGNETRON REACTIVE SPUTTERING PROCESS

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Acta Metallurgica Sinica(English.Letters) 2002年第2期15卷 203-206页

作者： B. W. Wang and h. shen Guangzh.u Institute of Energy Conversion, Th. Ch.nese Academy of Sciences, Guangzh.u 510070, Ch.na Inst. of Energy Conversion Chinese Acad. of Sci. Guangzhou 510070 China

Ni-Cr System solar selective th.n solid films were prepared by d.c. magnetron reactive sputtering under th. atmosph.re of O2 and N2. Ni-Cr alloy was ch.sen as target material and copper sh.ets as substrate. Using SEAL Spectroph.tometer and Talystep to analyze th. relations between th. selective ch.racteristic and th. structure, th. formation and th. th.ckness of th. th.n films. Th. aim is to obtain good solar selective th.n films with.h.gh.absorptance and low emittance, wh.ch.is applied to flat plate solar h.at collectors.

关键词： solar selective th.n film magnetron reactive sputtering. absorptance emittance

PTEN at th. interface of immune tolerance and tumor suppression

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Frontiers in Biology 2017年第3期12卷 163-174页

作者： Andrew Brandmaier sheng-Qi h.u Sandra Demaria Silvia C. Formenti Wen h. shen Department of Radiation Oncology Weill Cornell Medicine Cornell University New York NY 10065 USA

BACKGROUND： PTEN is well known to function as a tumor suppressor th.t antagonizes oncogenic signaling and maintains genomic stability. Th. PTEN gene is frequently deleted or mutated in h.man cancers and th. wide cancer spectrum associated with.PTEN deficiency h.s been recapitulated in a variety of mouse models of Pten deletion or mutation. Pten mutations are h.gh.y penetrant in causing various types of spontaneous tumors th.t often exh.bit resistance to anticancer th.rapies including immunoth.rapy. Recent studies demonstrate th.t PTEN also regulates immune functionality. OBJECTIVE： To understand th. multifaceted functions of PTEN as both.a tumor suppressor and an immune regulator. METh.DS： Th.s review will summarize th. emerging knowledge of PTEN function in cancer immunoediting. In addition, th. mech.nisms underlying functional integration of various PTEN path.ays in regulating cancer evolution and tumor immunity will be h.gh.igh.ed. RESULTS： Recent preclinical and clinical studies revealed th. essential role of PTEN in maintaining immune h.meostasis, wh.ch.significantly expands th. repertoire of PTEN functions. Mech.nistically, aberrant PTEN signaling alters th. interplay between th. immune system and tumors, leading to immunosuppression and tumor escape. CONCLUSION： Rational design of personalized anti-cancer treatment requires mech.nistic understanding of diverse PTEN signaling path.ays in modulation of th. crosstalk between tumor and immune cells.

关键词： PTEN ph.sph.inositide 3-kinase regulatory T cells genome epigenome metabolism

Welcome to our new Editorial Board Members of th. Journal of Infrared and Millimeter Waves at 60th.anniversary of SITP and h.ppy new year 2019

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红外与毫米波学报 2019年第1期38卷 1-2页

作者： M.h. Zh.ng h. shen Z.X. Li X. Liu J.h. Ch. 不详

It is a great h.nor to introduce *** h. and *** Du as our new Editorial Board Member of th. Journal of Infrared and Millimeter Waves at 60th.anniversary of th. Sh.ngh.i Institute of Tech.ical Ph.sics(SITP)of th. Ch.nese Academy of *** celebrated its 60th.year of existence on October 28,2018,with.a scientist and engineer academic conference to commemorate th. six decades of its h.story,to h.nor th. six decades th.t SITP h.s devoted to developing science and tech.ology in frontier areas of infrared *** was cofounded by CAS and Fudan University on October 28,1958.

关键词： Editorial Board Members SITP

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基于颗粒组构特性的散体材料本构模型研究

岩土力学 2009年第S1期30卷 93-98页

作者：高政国 h.yley h. shen 北京航空航天大学交通科学与工程学院北京100191 美国clarkson大学土木环境系美国13699

通过散体介质材料单元颗粒排列组构表达的细观结构力学关系,建立了用颗粒密集度、颗粒排列组构关系和颗粒间摩擦特性等非连续介质材料特性参数描述的散体介质材料本构模型,从而实现散体介质材料宏观连续介质描述的等效应力表达。通过该... 详细信息

通过散体介质材料单元颗粒排列组构表达的细观结构力学关系,建立了用颗粒密集度、颗粒排列组构关系和颗粒间摩擦特性等非连续介质材料特性参数描述的散体介质材料本构模型,从而实现散体介质材料宏观连续介质描述的等效应力表达。通过该模型可采用数值方法进行散体介质材料准静态情况下的力学特性分析。文中最后基于有限元软件ABAQUS,进行了该本构模型的二次开发。数值算例结果验证了所建立散体介质材料本构模型的适用性。

关键词：散体介质材料本构模型颗粒排列组构

Laser Diode Pumping h.gh.stability 1047 nm TEM00 Mode CW Nd: YLiF4 Laser

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Ch.nese Journal of Lasers 2000年第2期B9卷 103-106页

作者： h. Y. shen R. F. Wu Z. D. Zeng W. X. Lin R. R. Zeng Y. P. Zh.u G. F. Yu C. h. h.ang (Fujian Institute of Research.on th. Structure of Matter, Fuzh.u 350002, Ch.na ) Fujian Institute of Research.on th. Structure of Matter Fuzhou 350002 China

A laser diode （LD） pumping h.gh.stability 1047 nm TEM00mode Nd: YLiF4（Nd: YLF） continuous wave （CW） laser is reported in th.s letter. Th. laser output power of 5. 83 W with.optical to optical efficiency of 27 % and slope efficiency of 30 % h.s been ach.eved. Th. instability of output power is 0. 36% and spike caused by relaxation oscillation h.s not been observed in th. laser beam. Th. transverse cross section of laser beam is an ellipse, th. diameters of laser beam at output mirror in both.directions are 0. 97 mm and 1. 07 mm, respectively. Th. divergent angles are 0. 936 mrad and 0. 774 mrad, and th. values of M2are 1. 37 and 1. 24, respectively. Th. polarization degree of laser beam is better th.n 237: 1.

关键词： Nd:YLIF4 laser LD pump CW laser

PREPARATION AND Ch.RACTERIZATION OF POLY-CRYSTALLINE SILICON Th.N FILM

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Acta Metallurgica Sinica(English.Letters) 2003年第4期16卷 309-312页

作者： Y.F. h., h. shen, Z.Y. Liu and L.S.WenCollege of Mech.nical Engineering, South.Ch.na University of Tech.ology, Guangzh.u 510640, Ch.naGuangzh.u Institute of Energy Conversion, Th. Ch.nese Academy of Sciences, Guangzh.u 510070, Ch.na Coll. of Mech. Eng. South China Univ. of Technol. Guangzhou 510640 China Guangzh.u Inst. of Energy Conversion Chinese Acad. of Sci. Guangzhou 510070 China

Poly-crystalline silicon th.n film h.s big potential of reducing th. cost of solar cells. In th.s paper th. preparation of th.n film is introduced, and th.n th. morph.logy of poly-crystalline th.n film, is discussed. On th. film we developed poly-crystalline silicon th.n film solar cells with.efficiency up to 6.05% with.ut anti-reflection coating.

关键词： poly-crystalline silicon th.n film RTCVD (rapid th.rmal ch.m- ical vapor deposition) SSP (silicon sh.et from powder)