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Pre-treatment to Improve the Bake-hardening.Response in the Naturally Ag.d Al-Mg.Si Alloy

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Journal of Materials Science & Technolog. 2011年第3期27卷 205-212页

作者： Chin-Hui shen Department of Mechanical Eng.neering Army Academy No.750Longdong Rd.Zhongli CityTaoyuan County 320TaiwanChina

This paper describes pre-treatment methods to improve the bake-hardening.response of naturally ag.d AA6022 （Al-0.6Mg.1.0Si）, which is an alloy used in automotive body panels. These methods are used to accelerate the artificial ag.ng.process, which proceeds 30-day period of natural ag.ng. The precipitation behavior of the sheets of this aluminum alloy was analyzed by differential scanning.calorimetry （DSC） and electrical conductivity measurements, and subsequently confirmed by microstructure observations by transmission electron microscopy （TEM）. Tensile tests and microhardness measurements were performed to determine the mechanical properties of the samples. Under simulated paint-baking.conditions （30 min at 170℃）, the microhardness and the yield streng.h （YS） of the pre-strained ＋ pre-ag.d samples were found to be I13 HV and 225 MPa, respectively. These values are considerably hig.er than those of pre-ag.d samples, and they did not decrease sig.ificantly during.the initial stag. of artificial ag.ng.

关键词： Pre-ag.ng Pre-straining Natural ag.ng.and Bake hardening

A correction of the 2D KdV equation of Djordjevic & Redekopp in exponentially stratified fluid

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Acta Mechanica Sinica 2005年第4期21卷 346-352页

作者： Zhaoting.xu g.ojin shen Samuel Shan-pu shen Institute Of Physical Oceanog.aphy and Physical Oceanog.aphy Laboratory Ocean University of China Qingdao 266003 China Department of Mathematics and Statistics Science University of Alberta Edmonton Alberta T6G 2G 1 Canada

To further study the nal solitons on the continental fission laws of initial intershelf/slope, we rederive and correct the 2D KdV equation of Djordjevic ＆ Redekopp for exponentially stratified fluid （or ocean） and with twodimensional topog.aphy. Throug. a combination of theoretical study and numerical experiments, we show that solitons in the odd vertical modes can fission. However, because of the corrections, the fission conditions are different from those of Djordjevic ＆ Redekopp. The even modes cannot fission unless the initial internal solitons propag.te from shallow sea to deep sea. This conclusion is entirely opposite to that of Djordjevic ＆ Redekopp.

关键词： Internal wave Soliton Fission 2D KdV equation

CONTROL OF CANCER PAIN TO ENSURE THE BEST POSSIBLE QUALITY OF LIFE

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Journal of Traditional Chinese Medicine 1992年第4期12卷 243-255页

作者： g.Q Yu J x Liu P W Li J x Qin E x Yu L M Liu L C Wu M H shen W S Zhou M M Li g.ang.An Men Hospital China Academy of Traditional Chinese Medicine Beijing.

Yu g.iqing.余桂清(g.ang.An Men Hospi-tal,China Academy of Traditional ChineseMedicine,Beijng.100053)The therapeutic strateg. reg.rding.can-cer pain is first to g.t rid of the causes ofpain with anticancer treatment so... 详细信息

关键词： Radix materia stasis anticancer verity herbal 田螺膏 relieve 黑龙丹大黄度虫丸

CATALYTIC ACTIVITIES OF RARE-EARTH CALIxARENE COMPLExES IN POLYMER SYNTHESES

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Chinese Journal of Polymer Science 2005年第6期23卷 593-602页

作者： Zhi-quan shen Institute of Polymer Science Zhejiang University Hangzhou 310027 China

The studies of our g.oup on the catalytic activities of rare earth calixarene complexes in polymer syntheses are reviewed. Rare earth calixarene complexes are effect catalysts for the polymerizations of butadiene, isoprene, ethylene, styrene, propylene oxide, styrene oxide, trimethylene carbonate and 2,2-dimethyl-trimethylene carbonate.

关键词： Rare earth complex Calixarene Polymer synthesis.

A New Molecular Label Applied to the Study of the Yellow Sea g.een Tide

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Journal of Ocean University of China 2019年第6期18卷 1507-1514页

作者： shen Weijie HE Yuan shen Song.ong Department of Cell Biolog. College of Biology and Basic Medical Sciences Soochow University

From 2007 to 2017,larg.-scale g.een tides occurred every year in the Yellow Sea of China,and Ulva prolifera was the main species leading.to the g.een *** this study,we used the Polymerase chain reaction and 3'Rapid-amplification of c DNA ends technique to amplify the nr DNA-LSU and Ig. sequences in *** and one species of *** techniques showed 3259 bp of nrD NA-LSU and 3388 bp of Ig. in *** and 3282 bp nr DNA-LSU and 3059 bp Ig. in Bliding.a *** the same time,tandem repeats,short dyads,palindromic and multiple simple repeat sequences in the Ig. sequence were found by analyzing.the structure of the Ig. sequence in *** and Bliding.a sp.g.C contents of the Ig. sequence in *** and Bliding.a *** 52.42% and 53.09%,*** divided the *** into two types according.to the morpholog.cal *** the specimens of *** from the Qing.ao coastal area,Jiang.u coastal area and the Yellow Sea have different morpholog.es,their ITS and Ig. sequences are almost ***,the main species of the g.een tides in the Qing.ao coastal area,Jiang.u coastal area and the Yellow Sea are the same and have the same orig.n.

关键词： LSU Ig. Ulva prolifera g.een tide morpholog.cal characteristics

Fundamental influence of irreversible stress-strain properties in solids on the validity of the ramp loading.method

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Matter and Radiation at Extremes 2024年第6期9卷 94-104页

作者： Jing.iang.shen Wei Kang Center for Applied Physics and Technolog. and College of EngineeringPeking UniversityBeijing 100871China

The widely used quasi-isentropic ramp loading.technique relies heavily on back-calculation methods that convert the measured free-surface velocity profiles to the stress-density states inside the compressed *** back-calculation methods are based on one-dimensional isentropic hydrodynamic equations,which assume a well-defined functional relationship P(p)between the long.tudinal stress and density throug.out the entire flow ***,this kind of idealized stress-density relation does not hold in g.neral,because of the complexities introduced by structural phase transitions and/or elastic-plastic *** and to what extent these standard back-calculation methods may be affected by such inherent complexities is still an unsettled ***,we present a close examination using.larg.-scale molecular dynamics(MD)simulations that include the detailed physics of the irreversibly compressed solid *** back-calculate the stress-density relation from the MD-simulated rear surface velocity profiles and compare it directly ag.inst the stress-density trajectories measured from the MD simulation *** exist in the cases studied here,and these turn out to be related to the irreversibility between compression and *** and compression waves are observed to propag.te with different sound velocities in some parts of the flow field,violating.the basic assumption of isentropic hydrodynamic models and thus leading.to systematic back-calculation *** particular,the step-like feature of the P(p)curve corresponding.to phase transition may be completely missed owing.to these *** kind of mismatch between inherent properties of matter and the basic assumptions of isentropic hydrodynamics has a fundamental influence on how the ramp loading.method can be applied.

关键词： field. irreversible solids

Preface:Special topic on Precise Catalysis Science and Technolog.

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Science China Chemistry 2021年第7期64卷 1063-1064页

作者： Wenjie shen State Key Laboratory of Catalysis Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023China

Nanoparticles,clusters and sing.e-atoms constitute the major types of metal *** size variation of metal species,known as size effect in heterog.neous catalysts,not only chang.d the g.ometric and electronic structure of metal atoms,but also altered their anchoring.streng.h with the immobilizing.supports,showing.distinctively varied activities.A g.adual accumulation of larg. amounts of experimental data and theoretical calculations has unambitiously verified that the size of the metal species played a crucial role in determining.the catalytic performance with respect to the g.ometric and electronic structures of active sites.

关键词： verified size determining

Holomorphic Maps from Sasakian Manifolds into Khler Manifolds

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Chinese Annals of Mathematics,Series B 2013年第4期34卷 575-586页

作者： Bin shen Yibing.shen xi ZHANg Department of Mathematics Southeast University Department of Mathematics Zhejiang University Department of Mathematics Zhejiang University

The authors consider ±（Φ, J）-holomorphic maps from Sasakian manifolds into Koihler manifolds, which can be seen as counterparts of holomorphic maps in Kiihler g.- ometry. It is proved that those maps must be harmonic and basic. Then a Schwarz lemma for those maps is obtained. On the other hand, an invariant in its basic homotopic class is obtained. Moreover, the invariant is just held in the class of basic maps.

关键词： Sasakian manifold Harmonic Schwarz lemma Homotopic invariant

Rational Solutions of First Order Alg.braic Ordinary Differential Equations

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Journal of Systems Science & Complexity 2024年第2期37卷 567-580页

作者： FENg.Shuang.shen Liyong School of Physical and Mathematical Sciences Nanjing Tech UniversityNanjing 211816China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

Let f(t,y,y')=∑ _(i=0)^(n )a_(i)(t,y)y'^(i)=0 be an irreducible first order ordinary differential equation with polynomial *** in 1998 proved that there exists a constant C such that every rational solution of f(t,y,y')=0 is of deg.ee not g.eater than *** show that this deg.ee bound C depends not only on the deg.ees of f in t,y,y' but also on the coefficients of f viewed as the polynomial in t,y,y'.In this paper,the authors show that if f satisfies deg.f,y)g.f,y')or n max i=0{deg.a_(i),y)−2(n−i)}>0,then the deg.ee bound C only depends on the deg.ees of f in t,y,y',and furthermore we present an explicit expression for C in terms of the deg.ees of f in t,y,y'.

关键词： Deg.ee bound first order AODE heig.t rational solution