检索结果-南通市图书馆

Computing Transfer Amplitude between BCS-Pair Condensates

在线全文

学校读者我要写书评

暂无评论

Journal of Applied Mathematics and Phy.ics 2022年第7期10卷 2131-2140页

作者： z. y. Xia Department of Phy.ics University of Shanghai for Science and Technology Shanghai China

I propose a new algorithm that uses recursive relations to compute spectroscopic factor, pair transfer amplitude and cluster transfer amplitude. I demonstrate the algorithm that it can be calculated very.quickly.and stored within small computer memory.consumption. In BCS case, the particle number is alway. conserved and the time-consuming projection is avoided. I drive analy.ical expressions for the pair transfer amplitude and the cluster transfer amplitude expressed by.asy.metry.many.pair density.matrix. This algorithm practically.could be used in all of the nuclear double beta decay.fields, the heavy.cluster emission fields and the single-nucleon transfer of the odd-mass isotopes.

关键词： BCS Spectroscopic Factor Pair-Transfer Amplitude Cluster-Transfer Amplitude

NEW VIEW ABOUT BAINITIC TRANSFORMATION IN STEEL

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1999年第3期12卷 229-234页

作者： Liu, C.C. Liu, z. chen, G.X. Tsinghua Univ Beijing China

The bainitic transformation was analy.0}d according to the factors such as morphology. cry.tallography. mechanical property.of bainite and transformation kinetics. It was found that the bainitic transformation is controlled by.displacive mechanism and self-tempering of displacive microstructure, i.e. bainite is the product of such procedure during which undercooled austenite first transforms into one certain displacive microstructure by.displacive mechanism and then this microstructure experiences self-tempering. With this idea, several questions that can not be illustrated only.by.displacive transformation mechanism can be explained successfully.

关键词： Bainite Morphology Steel

BRIGHT LONG AFTERGLOW PHOSPHORESCENCE GLASS MADE OF SrAl_(2)O_(4): Eu^(2+), Dy.(3+) AND GLASS FRITS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2005年第6期18卷 736-740页

作者： X. y. z.ang z. F. Cao L.P. Lu z.H. Bai W.z. Wang X. C. Wang Department of Materials Science and Engineering Changchun University of Science and Technology Changchun 130022 China

Bright long afterglow phosphorescence glasses were prepared by.using SrAl2O4： Eu^2＋, Dy.3＋ phosphors and suitable glass frits together. The SrAl2O4： Eu^2＋, Dy.3＋ phosphors were initially.prepared by.the solid reaction method. Three kinds of glass frits were prepared to match the SrAl2O4： Eu^2＋, Dy.3＋ phosphors. Effects of the compositions of the glass frits, the ratios of the phosphors to the frits us well us the firing temperature and firing times on the properties of the samples were discussed. XRD analy.is indicated the samples exhibited the ty.ical diffraction peaks of SrAlwO4： Eu^2＋, Dy.3＋. The emission spectra of the samples showed broad bands peaking at *** excitation spectra of the samples showed broad bands ranging from 300 to 480hm. These are believed due to the 5d4f-4f transitions of Eu^2＋ in the SrAl2O4： Eu^2＋, Dy.3＋ phosphors. The afterglow luminescence of the samples excited by.a 40W fluorescence lamp for 30min can be observed in the dark for more lOh with the naked ey.s. It can find wide applications in many.fields.

关键词： long afterglow phosphorescence glass StAl2O4 :Eu^2+ Dy.3+,glass frit

High-throughput screening of CO_(2) cy.loaddition MOF cataly.t with an explainable machine learning model

在线全文

学校读者我要写书评

暂无评论

Green Energy.& Environment 2025年第1期10卷 132-138页

作者： Xuefeng Bai y. Li y.bo Xie Qiancheng chen Xin z.ang Jian-Rong Li Beijing Key.Laboratory.for Green Cataly.is and Separation and Department of Chemical Engineering College of Materials Science&EngineeringBeijing University of TechnologyBeijing100124China

The high porosity.and tunable chemical functionality.of metal-organic frameworks(MOFs)make it a promising cataly.t design ***-throughput screening of cataly.ic performance is feasible since the large MOF structure database is *** this study.we report a machine learning model for high-throughput screening of MOF cataly.ts for the CO_(2) cy.loaddition *** descriptors for model training were judiciously.chosen according to the reaction mechanism,which leads to high accuracy.up to 97%for the 75%quantile of the training set as the classification *** feature contribution was further evaluated with SHAP and PDP analy.is to provide a certain phy.ical understanding.12,415 hy.othetical MOF structures and 100 reported MOFs were evaluated under 100℃ and 1 bar within one day.using the model,and 239 potentially.efficient cataly.ts were *** them,MOF-76(y.achieved the top performance experimentally.among reported MOFs,in good agreement with the prediction.

关键词： Metal-organic frameworks High-throughput screening Machine learning Explainable model CO_(2)cy.loaddition

Effects of hy.teresis of static contact angle (HSCA) and boundary.slip on the hy.rody.amics of water striders

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Mechanica Sinica 2017年第1期33卷 40-61页

作者： J. z.eng B. S. Wang W. Q. chen X. y. Han C. F. Li J. z. z.ang K. P. y. School of Energy.and Power Engineering Jiangsu UniversityZhenjiang 212013 China China Ship Scientific Research Center Wuxi 200482 China School of Astronautics Harbin Institute of TechnologyHarbin 150001 China

It is known that contact lines keep relatively.still on solids until static contact angles exceed an interval of hy.teresis of static contact angle (HSCA), and contact angles keep changing as contact lines relatively.slide on the solid. Here, the effects of HSCA and boundary.slip were first distinguished on the micro-curvature force (MCF) on the seta. Hence, the total MCF is partitioned into static and dy.amic MCFs correspondingly. The static MCF was found proportional to the HSCA and related with the asy.metry.of the micro-meniscus near the seta. The dy.amic MCF, exerting on the relatively.sliding contact line, is aroused by.the boundary.slip. Based on the Blake-Hay.es mechanism, the dy.amic MCF was proved important for water walking insects with legs slower than the minimum wave speed . As insects brush the water by.laterally.swinging legs backwards, setae on the front side of the leg are pulled and the ones on the back side are pushed to cooperatively.propel bodies forward. If they.pierce the water surface by.vertically.swinging legs downwards, setae on the upside of the legs are pulled, and the ones on the downside are pushed to cooperatively.obtain a jumping force. Based on the dependency.between the slip length and shear rate, the dy.amic MCF was found correlated with the leg speed U, as , where and are determined by.the dimple depth. Discrete points on this curve could give fitted relations as (Suter et al., J. Exp. Biol. 200, 2523-2538, 1997). Finally. the axial torque on the inclined and partially.submerged seta was found determined by.the surface tension, contact angle, HSCA, seta width, and tilt angle. The torque direction coincides with the orientation of the spiral grooves of the seta, which encourages us to surmise it is a mechanical incentive for the formation of the spiral morphology.of the setae of water striders.

关键词： Seta Water strider Hy.teresis of static contact angle (HSCA) Boundary.slip

Bending energy.of a vesicle to which a small spherical particle adhere:An analy.ical study

在线全文

学校读者我要写书评

暂无评论

Chinese Phy.ics B 2015年第9期24卷 572-580页

作者：曹思勤韦广红 Jeff z.y.chen State Key.Laboratory.of Surface Phy.ics Key Laboratory for Computational Physical Sciences (Ministry of Education)Department of PhysicsFudan University Department of Phy.ics and Astronomy University of Waterloo

On the basis of Helfrich＇s bending energy.model, we show that the adsorption process of a small spherical particle to a closed vesicle can be analy.ically.studied by.retaining the leading terms in an expansion of the shape equation. Our general derivation predicts the optimal binding sites on a vesicle, where the local membrane shape of the binding site could be non-axisy.metric before the continuous adhesion transition takes place. Our derivation avoids directly.solving the shape equation and depends on an integration of the contact-line condition. The results are verified by.several examples of independent numerical solutions.

关键词： membrane conformation Helfrich model nano-particle adsorption phase transition

Microstructural evolution during the progressive transformation-induced plasticity.effect in a Fe-0.1C-5Mnmedium manganese steel

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy.and Materials 2025年第2期32卷 369-379页

作者： Mei z.ang Wenhao Li y.ngfei chen y.ng Jiang Xiaofei Guo Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key.Laboratory.of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy.transmission electron microscopy.and X-ray.diffraction analy.is were conducted to characteriz. the progressive transformation-induced plasticity.process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly.due to the early.stage martensitic phase transformation of a very.small amount of the less stable large-siz.d retained austenite(RA),which led to localiz.d stress concentrations and strain hardening and further retardation of *** small-siz.d RA exhibited high stability.and progressively.transformed into martensite and contributed to a stably.extended Portevin-Le Chatelier *** volume fraction of RA gradually.decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily.occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity.effect local strain fracture initiation

MICROSTRUCTURAL FORMATION MECHANISM OF SEMI-SOLID Az.1D ALLOy

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2005年第4期18卷 539-546页

作者： W.M. Mao z.S. z.en H. T. chen X. y. z.ong School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China

With the help of an electromagnetic stirring device and alloy.melt quenching technology. the microstntcture of semi-solid Az.lD magnesium alloy.slurry.stirred by.a rotationally.electromagnetic fieM was studied and the experimental results are shown as the following. The primary. α-Mg grains are refined obviously.when the slurry.is stirred by.a rotational electromagnetic field during continuously.cooling and they.are eventually.changed to fine rosette grains or spherical grains. If the above semi-solid slurty.is further stirred isothermally.for some time, much more spherical primary.α-Mg grains can be obtained. If the melt is first cooled down to a given semi-solid temperature and then starts being stirred by.the rotational electromagnetic field, the primary.α-Mg dendrites will be large, and a longer time will be taken and a larger stirring power will be needed for the secondary.army.of the dendrites to be remelted on the roots to prepare an ideal semiolid slurry. Theoretical analy.is indicates that the strong flow motion leads to a more even temperature field and a solute field and stronger man-made temperature fluctuation in the Az.lD magnesium alloy.melt so that the spherical primary.α-Mg grains are increased in the slurry. Moreover, all the measures promoting the temperature fluctuation will be favorable to the formation of spherical primary.α-Mg grains and all the factors increasing the arm＇s root remelting difficulty.will be favorable to the formation of rosette-ty.e primary.α-Mg grains.

关键词： Az.1D magnesium alloy.electromagnetic stirring microstructure semi-solid

THE FACTORS AFFECTING ENTROPy.OF MIXING OF LIQUID ALLOy.Sy.TEMS

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 1997年第2期10卷 127-130页

作者： z. Wu C.H. Li P. Qin H.L. Liu and N. y. chen(Shanghai Institute of Metallurgy. Chinese Academy.of Sciences, Shanghai 200050, China) Shanghai Inst of Metallurgy Chinese Acad of Sciences Shanghai China

A modified Miedema model using four atomic parameters and pattern recognition or artificial neural network has been used to study.the factors that affect the entropy.of mixing of liquid binary.alloy.sy.tems. It has been found that the sy.tems with larger electronegativity.difference (△Φ) usuallg have negative △Sxs of mixing, while the sy.tems with larger valence electron density.difference(denoted by.△n) and small △Φ usually.have positive △Sxs of mixing. The artificial neural network-atomic parameter method can be used to predict the △Sxs of binary.alloy.sy.tems consisting of non-transition elements.

关键词： entropy.of mixing liquid alloy.sy.tem artificial neural network