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Search Results: 1 - 10 of 129777 matches for " China Correspondence should be addressed to Li Baojian "
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A novel method of DNA shuffling without PCR process
WANG Qiang,LIU Qiuyun,LI Gang & LI Baojian Key Laboratory of Gene Engineering of Ministry of Education,School of Life Sciences,Zhongshan University,Guangzhou,China Correspondence should be addressed to Li Baojian,

科学通报(英文版) , 2004,
Abstract: Most DNA shuffling methods currently used require PCR process. A novel method of DNA shuffling without PCR process is described, taking advantage of the feature of some restriction enzymes whose recognition sites differ from their cleavage sites, thus giving rise to different cohesive ends.These cohesive ends can be rejoined at their native sites from different parental sequences, generating new sequences with various combinations of mutations.
On Grain Size Dependence of Minimum Creep Rate
LI Pei''en Institute of Materials Science,Engineering,Shanghai Jiaotong University,Shanghai,China To whom correspondence should be addressed,

材料科学技术学报 , 1992,
Abstract: The available experimental results have been summarized concerning the effect of grain size on minimum creep rate.There are two types of creep rate-grain size relations.One is that there is a criti- cal grain size above which creep rate is independent of grain size,below which creep rate increases with the decrease of grain size.The other is that there is an intermediate grain size at which creep resistance is optimum.The first relation usually occurs at higher temperatures(>0.5 T_m),and intermediate stress ranges,while the second relation at interme- diate temperature ranges(0.4-0.5 T_m)and higher stresses.For the two types of creep rate-grain size relations,the increase of the creep rates with the de- crease of grain size for small grain sizes is all due to grain boundary sliding.For large grain sizes,a dis- location climb mechanism is dominant in creep deformation for the first relation,while a Hall-Perch grain boundary strengthening effect is believed to play an important role by dislocation glide mechanism for the second relation.
Influence of Carbon Content and Solidification Condition on Incipient Melting of DS Superalloy MAR-M200+2Hf
ZHENG Yunrong,WANG Luobao,LI Chenggong Institute of Aeronautical Naterials,Beijing,China To whom correspondence should be addressed,

材料科学技术学报 , 1989,
Abstract: Hf lowers the incipient melting temperatureof superalloy. As carbon content in Hf-bearingalloy decreases, the incipient melting temperaturedrops furthey. PD ingots have stronger tendencyto incipient melting than HRS ones. Even thoughin PD ingot, the sensitivities at both endsof the ingot are quite different. The meltingof Ni_5Hf phase may be considered as one of themain factors affecting incipient melting. Themore Ni_5Hf the alloy contains, the more seriousthe incipient melting becomes. The results ofdifferential thermal analysis (DTA) have provedthat the peak of 1135-1160℃ corresponds tothe melting range or Ni_5Hf. By means of apretreatment at 1150℃, 8h, Ni_5Hf phase can beeliminated in two ways: the reactionNi_5Hf+γ(C)→MC_(2)+γ and solid solution, andtherefore the final solid solution treatmentcan be carried out at 1260℃. This brings abouta high homogenized structure and further increasesthe stress rupture properties of the alloy at1040℃, 140 MPa.
Molecular Dynamics Simulation of Liquid Noble Metals Au and Ag
LI Qingchun CHEN Kuiying Deptof Metals,Technology,Harbin Institute of Technology,Harbin,China To whom correspondence should be addressed,

材料科学技术学报 , 1992,
Solute Redistribution Model for Multicomponent AHoys during Rapid Solidification
CHEN Kuiying LI Qingchun Deptof Metals,Technology,Harbin Institute of Technology,Harbin,China To whom correspondence should be addressed,

材料科学技术学报 , 1992,
Abstract: 1.IntroductionThe solute redistribution models for binary alloys during the rapid solidification havebeen extensively studied in recent years1-10],but up to now the solute redistribution modelfor multicomponent alloys has not been reported.In this paper the solute redistribution mod-el for the multicomponent alloys based on the Aziz model is established theoretically.
Terrestrial mollusk evidence for the origin and sedimentary environment of the Late Tertiary Red Clay Formation in the Loess Plateau, China
PEI Yunpeng,WU Naiqin,LI Fengjiang Institute of Geology,Geophysics,Chinese Academy of Sciences,Beijing,China Correspondence should be addressed to Wu Naiqin,

科学通报(英文版) , 2004,
Abstract: The origin and sedimentary environment of the Late Tertiary (Neogene) Red Clay Formation in northern China had long been controversial. A new mollusk record from the Xifeng red clay (red-earth) sequence in the central Loess Plateau provides the biological evidence for addressing questions of its origin and environmental implication. The study of composition and preservation condition of seventy mollusk fossil assemblages reveals the initial ecological con- dition of the red clay formation, avoiding the effect of post-deposited alteration. The result shows that all of identi- fiable mollusk species are composed of terrestrial taxa, most of them are the common species found in the overlying Qua- ternary loess-paleosol sequence. Most of fossil individuals preserved in the red clay strata are in living conditions based on the investigation of fieldwork, indicating the original population. Thus, the mollusk fossil assemblages can be used as an indicator of primary environment of the red clay for- mation. The mollusk record from the Xifeng red clay se- quence supports the view that the red clay is an aeolian ori- gin, similar to the overlying Quaternary loess deposits. Our data also reveal the history of environmental changes at Xifeng from 6.2--2.4 Ma, which is coupled in phase with the formation and development of the Arctic ice sheets and the process of the Tibetan Plateau uplift. Both may be the major cause and forcing mechanisms of the late Tertiary environmental changes in the Loess Plateau.
Reaction of CH radical with O_2 by time-resolved FTIR spectroscopy
REN Li,KONG Fanao,
,& KONG Fanao . State Key Laboratory of Molecular Reaction Dynamics,Institute of Chemistry,Chinese Academy of Sciences,Beijing,China,. Graduate School of the Chinese Academy of Sciences,Beijing,China Correspondence should be addressed to Kong Fanao

科学通报(英文版) , 2003,
Abstract: The reaction of CH radical with O2 has been experimentally investigated by time-resolved Fourier transform IR emission spectroscopy. CH radicals were generated by multi-photon UV laser photolysis of bromoform (CHBr3) in gaseous phase. Highly vibrationally excited product CO (v =1-12) with a near Boltzmann distribution was observed after the reaction. The vibrational temperature of CO is estimated as high as 14400(1400 K and the averaged vibrational energy is about 25.8 kcal(mol-1. The emission intensity of CO is not sensitive to the quenching gas, which indicates that there is no early barrier in the reaction of CH+O2. However, the theoretically predicted product CO2 has not been found in the experiment.
Stochastic analysis of particle-fluid two-phase flows
SUN GuogangLI JinghaiGONG FuzhouLUO Shunlong MA Zhiming,
SUN Guogang
,LI Jinghai (Institute of Chemical Metallurgy,Chinese Academy of Sciences,Beijing,China GONG Fuzhou,MA Zhiming (Institute of Applied Mathematics,Chinese Academy of Sciences,Beijing,China LUO Shunlong (Correspondence should be addressed to Sun Guogang

科学通报(英文版) , 2000,
Abstract: This paper is devoted to exploring approaches to understanding the stochastic characteristics of particle-fluid two-phase flow. By quantifying the forces dominating the particle motion and modelling the less important and/or unclear forces as random forces, a stochastic differential equation is proposed to describe the complex behavior of a particle motion. An exploratory simulation has shown satisfactory agreement with phase doppler particle analyzer (PDPA) measurements, which indicates that stochastic analysis is a potential approach for revealing the details of particle-fluid flow phenomena.
Hydrogen Decrepitation of a Sm_2Fe_(17)Alloy
ZHAO Xu LI Donghua FAN Cungan LI Dongfa WANG Anchuan LI Yiyi Institute of Metal Research,Academia Sinica,Shenyang,China To whom correspondence should be addressed,

材料科学技术学报 , 1992,
Abstract: 1.IntroductionThe rhombohedral compoundSm_2Fe_(17)N_x(x=1~3)is currently attractinginterest due to its promise as a new perma-nent magnet material.Its magnetic proper-ties have been investigated in details.TheSm-Fe-N materials with quite good mag-
Residual Stresses and Deformation Behaviour in a SiC_p/Al Composite
SUN Zhengming LI Jiabao WANG Zhongguang LI Weijie ZHOU Yanchun State Key Labfor Fatigue,Fracture of Materials,Institute of Metal Research,Academia Sinica,Shenyang,China To whom correspondence should be addressed,

材料科学技术学报 , 1992,
Abstract: Experiments were conducted to determine theresidual stresses with X-ray diffraction in the ma-trix of a SiC/Al composite after different thermaltreatments,and to investigate the stress-straincharacteristics and fracture behaviour of the com-posite.It was found that there existed a tensileresidual stress in the matrix and both thermal cy-cling between room temperature and 350℃ and lowtemperature treatment in liquid nitrogen reducedthe residual stress.The results of the strengthdifferential effect and Bauschinger effect were con-sistent with the results of residual stressmeasurements.The tensile residual stresses in the Almatrix enhanced the strength differential effect.Themagnitude of Bauschinger effect is greater for a testinitially started in compression than that in tension.
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