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Measurements of dihadron correlations relative to the event plane in Au+Au collisions at√^(S)NN=200 GeV 被引量:351
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作者 H.Agakishiev M.M.Aggarwal +140 位作者 Z.Ahammed A.V.Alakhverdyants I.Alekseev J.Alford b.D.Anderson C.D.Anson D.Arkhipkin G.S.Averichev J.balewski D.R.beavis N.K.behera R.bellwied M.J.betancourt R.R.betts A.bhasin A.K.bhat H.bichsel J.bieleik J.bielcikova b.biritz L.C.bland W.borowski J.bouchet E.braidot A.V.brandin A.bridgeman S.G.brovko E.bruna S.bueltmann I.bunzarov T.P.burton X.Z.Cai H.Caines M.Calderon de la barca Sanchez D.Cebra R.Cendejas M.C.Cervantes Z.Chajecki P.Chaloupka S.Chattopadhyay H.F.Chen J.H.Chen J.Y.Chen L.Chen J.Cheng M.Cherney A.Chikanian K.E.Choi W.Christie P.Chung M.J.M.Codrington R.Corliss J.G.Cramer H.J.Crawford S.Dash A.Davila Leyva L.C.De Silvat R.R.Debbe T.G.Dedovich A.A.Derevschikov R.Derradi de Souza L.Didenko P.Djawotho S.M.Dogra X.Dong J.L.Drachenberg J.E.Draper J.C.Dunlop L.G Efimov M.Elnim J.Engelage G Eppley M.Estienne L.Eun O.Evdokimov R.Fatemi J.Fedorisin A.Feng R.G.Fersch P.Filip E.Finch V.Fine Y.Fisyak C.A.Gagliardi D.R.Gangadharan A.Geromitsos F.Geurts P.Ghosh Y.N.Gorbunov A.Gordon O.Grebenyuk D.Grosnick S.M.Guertin A.Gupta W.Guryn b.Haag O.Hajkova A.Hamed L-X.Han J.W.Harris J.P.Hays-Wehle M.Heinz S.Heppelmann A.Hirsch E.Hjort G.W.Hoffmann D.J.Hofiman b.huang H.Z.huang T.J.Humanic L.Huo G.Igo P.Jacobs W.W.Jacobs C.Jena F.Jin J.Joseph E.G.Judd S.Kabana K.Kang J.Kapitan K.Kauder H.Ke D.Keane A.Kechechyan D.Kettler D.P.Kikola J.Kiryluk A.Kisiel V.Kizka A.G.Knospe D.D.Koetke T.Kollegger J.Konzer I.Koralt L.Koroleva W.Korsch L.Kotchenda V.Kouchpil P.Kravtsov K.Krueger 《Chinese Physics C》 SCIE CAS CSCD 2021年第4期198-241,共44页
Dihadron azimuthal correlations containing a high transverse momentum(pr)trigger particle are sensit-ive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the tr... Dihadron azimuthal correlations containing a high transverse momentum(pr)trigger particle are sensit-ive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium,ie.jet-quenching.Previous measurements revealed a strong modification to di-hadron azimuthal correlations in Au+Au collisions with respect to ptp and d+Au collisions.The modification in-creases with the collision centrality,suggesting a path-length or energy density dependence to the je-quenching ef-fect.This paper reports STAR measurements of dihadron azimuthal correlations in mid-central(20%-60%)Au+Au collisions at√^(S)NN=200 GeV as a function of the trigger particle's azimuthal angle relative to the event plane,Ф_(s)=|Ф_(t)-ψ_(Ep)|.The azimuthal correlation is studied as a function of both the trigger and associated particle pr.The subtractions of the combinatorial background and anisotropic flow,assuming Zero Yield At Minimum(ZYAM),are described.The correlation results are first discussed with subtraction of the even harmonic(elliptic and quadrangu-lar)flow backgrounds.The away-side correlation is strongly modifed,and the modification varies withФ_(s),with a double-peak structure for out-of-plane trigger particles.The near-side ridge(long range pseudo-rapidity△_(η)correla-tion)appears to drop with increasingФ_(s)while the jet-like component remains approximately constant.The correla-tion functions are further studied with the subtraction of odd harmonic triangular flow background arising from fluc-tuations.It is found that the triangular flow,while responsible for the majority of the amplitudes,is not sufficient to explain theφs-dependence of the ridge or the away-side double-peak structure.The dropping ridge withФ_(s)could be attributed to aФ_(s)-dependent lliptie anisotropy;however,the physics mechanism of the ridge remains an open ques-tion.Even with aФ_(s)-dependent elliptic flow,the away-side correlation structure is robust.These results,with exte 展开更多
关键词 relativistic heavy ion collisions dihadron correlations jet-medium interactions anisotropic flow background event plane
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Unusually thick shear-softening surface of micrometer-size metallic glasses 被引量:1
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作者 J.Dong Y.Huan +5 位作者 b.huang J.Yi Y.H.Liu b.A.Sun W.H.Wang H.Y.bai 《The Innovation》 2021年第2期174-182,共9页
The surface of glass is crucial for understanding many fundamental processes in glassy solids.A common notion is that a glass surface is a thin layer with liquid-like atomic dynamics and a thickness of a few tens of n... The surface of glass is crucial for understanding many fundamental processes in glassy solids.A common notion is that a glass surface is a thin layer with liquid-like atomic dynamics and a thickness of a few tens of nanometers.Here,we measured the shear modulus at the surface of both millimeter-size and micrometer-size metallic glasses(MGs)through high-sensitivity torsion techniques.We found a pronounced shear-modulus softening at the surface of MGs.Compared with the bulk,the maximum decrease in the surface shear modulus(G)for the micro-scale MGs reaches~27%,which is close to the decrease in the G upon glass transition,yet it still behaves solid-like.Strikingly,the surface thickness estimated from the shear-modulus softening is at least 400 nm,which is approximately one order of magnitude larger than that revealed from the glass dynamics.The unusually thick surface is also confirmed by measurements using X-ray nano-computed tomography,and this may account for the brittle-to-ductile transition of the MGs with size reductions.The unique and unusual properties at the surface of the micrometer-size MGs are physically related to the negative pressure effect during the thermoplastic formation process,which can dramatically reduce the density of the proximate surface region in the supercooled liquid state. 展开更多
关键词 glass surface shear modulus TORSION metallic glasses
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REDUCTION BEHAVIOR OF IRON ORE PELLETS CONTAININGCARBON UNDER NON-ISOTHERMAL CONDITION
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作者 X.M.Yang Y.S.Xie +3 位作者 D.G.Wang D.b.huang T.J.Yang L.T.Kong 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2000年第5期1059-1067,共9页
The reduction behavior of iron ore pellets containing carbon under non-isothermal condition in the temperature range from 573 to 1373 K was investigated in a laboratory scale setup. The test results show that carbon c... The reduction behavior of iron ore pellets containing carbon under non-isothermal condition in the temperature range from 573 to 1373 K was investigated in a laboratory scale setup. The test results show that carbon content has no obvious effect on reduction degree of composite pellets (C/O mole ratio=1.0) by CO in the temperature range from 573 to 1373 K under linear temperature-rising program; reduction degree of iron ore pellets containing carbon is large in 90%CO-10%CO2 mixture than that of in 100%CO atmosphere or in 80%CO-20%CO2 mixture; the s type temperature-rising program has a better effect than that of linear one in increasing the reduction degree; and reduction degree of slower linear temperature-rising program is greater than that of faster one, but the final reduction degrees, i.e., those at the highest temperature are about the same for various CO partial pressures or temperature-rising programs. The kinetic analysis also shows that the reduction of iron ore-carbon composite pellets by CO or CO-CO2 mixture under non-isothermal condition should be controlled by surface reaction, and the apparent reduction activation energy changes with the reduction progress under various test conditions. 展开更多
关键词 iron ore pellet containing carbon reduction behavior KINETICS activation energy NON-ISOTHERMAL
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STCF conceptual design report (Volume 1): Physics & detector 被引量:1
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作者 M.Achasov X.C.Ai +163 位作者 L.P.An R.Aliberti Q.An X.Z.bai Y.bai O.bakina A.barnyakov V.blinov V.bobrovnikov D.bodrov A.bogomyagkov A.bondar I.boyko Z.H.bu F.M.Cai H.Cai J.J.Cao Q.H.Cao X.Cao Z.Cao Q.Chang K.T.Chao D.Y.Chen H.Chen H.X.Chen J.F.Chen K.Chen L.L.Chen P.Chen S.L.Chen S.M.Chen S.Chen S.P.Chen W.Chen X.Chen X.F.Chen X.R.Chen Y.Chen Y.Q.Chen H.Y.Cheng J.Cheng S.Cheng T.G.Cheng J.P.Dai L.Y.Dai X.C.Dai D.Dedovich A.Denig I.Denisenko J.M.Dias D.Z.Ding L.Y.Dong W.H.Dong V.Druzhinin D.S.Du Y.J.Du Z.G.Du L.M.Duan D.Epifanov Y.L.Fan S.S.Fang Z.J.Fang G.Fedotovich C.Q.Feng X.Feng Y.T.Feng J.L.Fu J.Gao Y.N.Gao P.S.Ge C.Q.Geng L.S.Geng A.Gilman L.Gong T.Gong b.Gou W.Gradl J.L.Gu A.Guevara L.C.Gui A.Q.Guo F.K.Guo J.C.Guo J.Guo Y.P.Guo Z.H.Guo A.Guskov K.L.Han L.Han M.Han X.Q.Hao J.b.He S.Q.He X.G.He Y.L.He Z.b.He Z.X.Heng b.L.Hou T.J.Hou Y.R.Hou C.Y.Hu H.M.Hu K.Hu R.J.Hu W.H.Hu X.H.Hu Y.C.Hu J.Hua G.S.huang J.S.huang M.huang Q.Y.huang W.Q.huang X.T.huang X.J.huang Y.b.huang Y.S.huang N.Hüsken V.Ivanov Q.P.Ji J.J.Jia S.Jia Z.K.Jia H.b.Jiang J.Jiang S.Z.Jiang J.b.Jiao Z.Jiao H.J.Jing X.L.Kang X.S.Kang b.C.Ke M.Kenzie A.Khoukaz I.Koop E.Kravchenko A.Kuzmin Y.Lei E.Levichev C.H.Li C.Li D.Y.Li F.Li G.Li G.Li H.b.Li H.Li H.N.Li H.J.Li H.L.Li J.M.Li J.Li L.Li L.Li L.Y.Li N.Li P.R.Li R.H.Li S.Li T.Li W.J.Li X.Li X.H.Li X 《Frontiers of physics》 SCIE CSCD 2024年第1期1-154,共154页
The superτ-charm facility(STCF)is an electron–positron collider proposed by the Chinese particle physics community.It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of... The superτ-charm facility(STCF)is an electron–positron collider proposed by the Chinese particle physics community.It is designed to operate in a center-of-mass energy range from 2 to 7 GeV with a peak luminosity of 0.5×10^(35) cm^(–2)·s^(–1) or higher.The STCF will produce a data sample about a factor of 100 larger than that of the presentτ-charm factory—the BEPCII,providing a unique platform for exploring the asymmetry of matter-antimatter(charge-parity violation),in-depth studies of the internal structure of hadrons and the nature of non-perturbative strong interactions,as well as searching for exotic hadrons and physics beyond the Standard Model.The STCF project in China is under development with an extensive R&D program.This document presents the physics opportunities at the STCF,describes conceptual designs of the STCF detector system,and discusses future plans for detector R&D and physics case studies. 展开更多
关键词 electron–positron collider tau-charm region high luminosity STCF detector conceptual design
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Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at Daya Bay 被引量:1
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作者 F.P.An A.b.balantekin +164 位作者 H.R.band M.bishai S.blyth G.F.Cao J.Cao J.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.Chu J.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu J.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger Y.K.Heng A.Higuera Y.K.Hor Y.b.Hsiung b.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.huang X.T.huang Y.b.huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettell S.Kohn M.Kramer T.J.Langford J.Lee J.H.C.Lee R.T.Lei R.Leitner J.K.C.Leung F.Li J.J.Li Q.J.Li S.Li S.C.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.b.Li H.Liang C.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link L.Littenberg b.R.Littlejohn J.C.Liu J.L.Liu C.Lu H.Q.Lu J.S.Lu K.b.Luk X.b.Ma X.Y.Ma Y.Q.Ma C.Marshall D.A.Martinez Caicedo K.T.MeDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.Naumova J.P.Ochoa-Ricoux A.OIshevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren C.Morales Reveco R.Rosero b.Roskovec X.C.Ruan H.Steiner J.L.Sun T.Tmej K.Treskov W.-H.Tse C.E.Tull b.Viren V.Vorobel C.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.J.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing J.L.Xu T.Xu T.Xue C.G.Yang L.Yang Y.Z.Yang H.F.Yao M.Ye M.Yeh b.L.Young H.Z.Yu Z.Y.Yu b 《Chinese Physics C》 SCIE CAS CSCD 2021年第5期190-201,共12页
The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars merge.In t... The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars merge.In the Daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW 170817.We used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino candidates.The detected electron-antineutrino candidates were consistent with the expected background rates for all the three time windows.Assuming monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w indows.Under the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows. 展开更多
关键词 grav itational waves electron-antineutrinos FLUENCE upper limit
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Antineutrino energy spectrum unfolding based on the Daya Bay measurement and its applications
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作者 F.P.An A.b.balantekin +163 位作者 M.bishai S.blyth G.F.Cao J.Cao J.F.Chang Y.Chang H.S.Chen S.M.Chen Y.Chen Y.X.Chen J.Cheng Z.K.Cheng J.J.Cherwinka M.C.Chu J.P.Cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal D.Dolzhikov J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong M.Grassi W.Q.Gu J.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans a M.He K.M.Heeger Y.K.Heng Y.K.Hor Y.b.Hsiung b.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.huang J.H.huang X.T.huang Y.b.huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettel S.Kohn M.Kramer T.J.Langford J.Lee J.H.C.Lee R.T.Lei R.Leitner J.K.C.Leung F.Li H.L.Li J.J.Li Q.J.Li R.H.Li S.Li S.C.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.b.Li H.Liang C.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link26 L.Littenberg b.R.Littlejohn J.C.Liu J.L.Liu J.X.Liu C.Lu H.Q.Lu K.b.Luk b.Z.Ma X.b.Ma X.Y.Ma Y.Q.Ma R.C.Mandujano C.Marshall K.T.McDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.Naumova T.M.T.Nguyen J.P.Ochoa-Ricoux A.Olshevskiy H.-R.Pan J.Park S.Patton J.C.Peng C.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren C.Morales Reveco R.Rosero b.Roskovec X.C.Ruan H.Steiner J.L.Sun T.Tmej1 K.Treskov W.-H.Tse C.E.Tull b.Viren V.Vorobel C.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.J.Wen K.Whisnant C.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing H.K.Xu J.L.Xu T.Xu T.Xue C.G.Yang L.Yang Y.Z.Yang 《Chinese Physics C》 SCIE CAS CSCD 2021年第7期1-19,共19页
The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era.The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by ... The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era.The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment,in combination with the fission rates of fissile isotopes in the reactor,is used to extract the positron energy spectra resulting from the fission of specific isotopes.This information can be used to produce a precise,data-based prediction of the antineutrino energy spectrum in other reactor antineutrino experiments with different fission fractions than Daya Bay.The positron energy spectra are unfolded to obtain the antineutrino energy spectra by removing the contribution from detector response with the Wiener-SVD unfolding method.Consistent results are obtained with other unfolding methods.A technique to construct a data-based prediction of the reactor antineutrino energy spectrum is proposed and investigated.Given the reactor fission fractions,the technique can predict the energy spectrum to a 2%precision.In addition,we illustrate how to perform a rigorous comparison between the unfolded antineutrino spectrum and a theoretical model prediction that avoids the input model bias of the unfolding method. 展开更多
关键词 reactor antineutrino energy spectrum Daya Bay application
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Time-Opening Suprapubic Catheter versus Intermittent Catheter for Male Patients with Spinal Cord Injury (Spinal Level above Level C5)
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作者 Hui Chen P. Tang +8 位作者 R. b. Ou J. W. Zeng M. P. huang Q. L. Liu Q. Q. Li J. b. huang T. H. huang Chonghe Jiang Keji Xie 《Open Journal of Urology》 2016年第9期154-157,共4页
Objective: To compare the short-time complications associated with time-opening suprapubic catheter (SPT) versus intermittent catheter (IC) in male patients with spinal cord injury (above level C5). Methods: A prospec... Objective: To compare the short-time complications associated with time-opening suprapubic catheter (SPT) versus intermittent catheter (IC) in male patients with spinal cord injury (above level C5). Methods: A prospective review of records was carried out to identify SCI patients managed with SPT or IC between 2011 and 2016. The complications included renal function (Serum creatinine), urinary tract infection (UTI), bladder stones, urethral complications, scrotal, and gross hematuria. Patients were followed at week 4, 3 and 6 months;the urodynamic assessment was repeated at 6 months. Results: A total of 30 patients (11 SPT, 19 IC) were recruited in this trial. There is no significant difference between the two catheter groups for the entire out-come. Scrotal abscesses and urethral stricture were only seen in patients with IC. Conclusions: SPT has similar urological complication with IC for SCI patients (above level C5) except the incidence of scrotal abscesses and urethral stricture. 展开更多
关键词 Suprapubic Catheter Intermittent Catheter Spinal Cord Injury
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SECOND-ORDER INTERACTION OF IRREGULAR WAVES WITH A TRUNCATED COLUMN 被引量:2
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作者 J.b.huang R.EatockTaylor 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 1997年第2期130-142,共13页
A complete semi-analytical solution is obtained for second-order diffraction of plane bichromatic waves by a fixed truncated circular column.The fluid domain is divided into interior and exterior regions.In the exteri... A complete semi-analytical solution is obtained for second-order diffraction of plane bichromatic waves by a fixed truncated circular column.The fluid domain is divided into interior and exterior regions.In the exterior region,the second-order velocity potential is expressed in terms of‘locked-wave’and‘free-wave’ components,both are solved using Fourier and eigenfunction expansions.The re- sulting‘locked wave’potential is expressed by one-dimensional Green's integrals with oscillating integrands.In order to increase computational efficiency,the far-field part of the integrals are carried out analytically.Solutions in both regions are matched on the interface by the potential and its normal derivative continuity conditions.Based on the present approach,the sum-and difference-frequency potentials are efficiently evaluated and are used to generate the quadratic transfer functions which correlates the incident wave spectrum with second-order forcing spectrum on the column.The sum-frequency QTFs for a TLP column are present,which are compared for some frequency pairs with those from a fully numerical procedure.Satisfactory agreement has been obtained.QTF spectra for a case study TLP column,generated using the semi-analytical solution are presented.Also given are the results for nonlinear wave field around the column. 展开更多
关键词 marine hydrodynamics nonlinear wave force wave-structure interaction second-order wave diffraction
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NONLINEAR DIFFRACTION OF BICHROMATIC WAVES BY A VERTICAL CYLINDER
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作者 J.b.huang, R. Eatock TaylorDepartment of Engineering Science, University of Oxford, Parks Road, Oxford, OX13PJ, UK. 《Journal of Hydrodynamics》 SCIE EI CSCD 1997年第4期97-110,共14页
We present in this paper a semi-analytical solution for second-order wave diffraction by a vertical circular cylinder in bichromatic waves. On the base of the usual assumption of an irrotational flow, the wave-diffrac... We present in this paper a semi-analytical solution for second-order wave diffraction by a vertical circular cylinder in bichromatic waves. On the base of the usual assumption of an irrotational flow, the wave-diffraction problems at second-order sum-frequency and difference-frequency are considered. The corresponding second-order diffraction potentials are decomposed into three parts, these are associated with the second-order incident wave, the quadratic forcing terras on the free-surface due to the first-order potential, and the linearised free-wave component resulting from the boundary condition on the body surface. A particular solution which exactly satisfies the inhomogeneous free-surface condition has been derived. Numerical results for the quadratic transfer functions of the second-order force components are given, and are compared with those obtained using numerical solutions (Kim & Yue, 1990,Moubayed & Williams 1995). These quadratic functions are useful in calculating the exciting forces on a circular cylinder of large dimension, fixed in irregular wave fields. 展开更多
关键词 bichromatic waves nonlinear diffraction cylinder
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Study on the radon removal for the water system of Jiangmen Underground Neutrino Observatory
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作者 C.Guo J.C.Liu +7 位作者 Y.P.Zhang P.Zhang C.G.Yang Y.b.huang W.X.Xiong H.Q.Zhang Y.T.Wei Y.Y.Gan 《Radiation Detection Technology and Methods》 2018年第2期128-132,共5页
Background The Jiangmen Underground Neutrino Observatory(JUNO),a 20-kton multipurpose underground liquid scintillator detector,was proposed with the determination of the neutrino mass hierarchy as a primary physics go... Background The Jiangmen Underground Neutrino Observatory(JUNO),a 20-kton multipurpose underground liquid scintillator detector,was proposed with the determination of the neutrino mass hierarchy as a primary physics goal.To veto the cosmogenic background and shield the central detector from the environmental radioactivity,a multi-veto system,which consists of a water Cherenkov detector and a top tracker detector,is required.In order to keep the water quality good and remove the radon from water,an ultrapure water system,a radon removal system and radon concentration measurement system have been designed.Method The JUNO ultrapure water system was designed on the basis of the water system of the Daya Bay experiment.By installing the degassing membrane devices on the water system of JUNO prototype and Daya Bay experiment which can remove radon from water,the radon removal efficiency has been measured at the conditions of different gas–liquid phase pressures and different gas concentrations in water using the radon measurement system.Result Loading carbon dioxide into the water and increasing the inlet water pressure could help to improve the radon removal efficiency of the degassing membrane devices,and the radon concentration in water can be reduced to∼0.1 Bq/m^(3).Conclusion A reliable ultrapure water production and circulation system has been designed to keep the water quality good and to reduce the radon concentration in water for JUNO water Cherenkov detector.The radon concentration in water can satisfy the requirement of JUNO by using the Liqui-Cel degassing membrane devices. 展开更多
关键词 Ultra-pure water RADON Degassing membranes
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The development of ^(222)Rn detectors for JUNO prototype
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作者 Y.P.Zhang J.C.Liu +5 位作者 C.Guo Y.b.huang C.Xu M.Y.Guan C.G.Yang P.Zhang 《Radiation Detection Technology and Methods》 2018年第1期32-37,共6页
Background JUNO(The Jiangmen Underground Neutrino Observatory)is a multipurpose neutrino experiment,and it has very strict requirements for the detector.According to the MC simulation for JUNO experiment requirements,... Background JUNO(The Jiangmen Underground Neutrino Observatory)is a multipurpose neutrino experiment,and it has very strict requirements for the detector.According to the MC simulation for JUNO experiment requirements,the Rn concentration in the water of the veto detector should be less than 0.2Bq/m^(3).In order to measure such low Rn concentration,two kinds of high-sensitivity Rn measurement systems have been developed.Method Based on the water system of JUNO prototype,two kinds of high-sensitivity Rn detectors have been developed,namely the Si-PIN Rn detector and the LS Rn detector.The Si-PIN Rn detector uses a Si-PIN photodiode to detect theαfrom ^(214)Po decay and the LS Rn detector detects the coincident signals ofβfrom ^(214)Bi decay andβfrom ^(214)Po decay.Result The background measurement of Si-PIN Rn detector and LS Rn detector is performed to estimate the sensitivity.The sensitivity of Si-PIN Rn detector is around 9.0mBq/m^(3) and the sensitivity of LS Rn detector is around 64.0Bq/m^(3).Conclusion Both of the Si-PIN Rn detector and the LS Rn detector are working well with the JUNO prototype at present,and both of them can be developed as an online Rn concentration monitoring device for JUNO veto detector. 展开更多
关键词 RADON Si-PIN Liquid scintillator
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卫星数据压缩
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作者 b.huang 胡光华 《国外科技新书评介》 2012年第9期7-7,共1页
这是一本有关卫星数据压缩的专著,书中各章出自来自世界各国专家之手。本书编辑Bormin Huang是美国威斯康辛一麦迪逊大学空间科学与工程中心的教授和首席研究员。
关键词 数据压缩 卫星 工程中心 空间科学 研究员
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数字化课程40年发展评析 被引量:20
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作者 周序 黄路遥 《课程.教材.教法》 CSSCI 北大核心 2018年第10期51-58,共8页
40年来,数字化课程从一种课程资源"升级"成为了课程本身。在迅速发展的背后,支撑数字化课程发展的各种教育信息化技术愈发清晰;但数字化课程究竟蕴含或体现了哪些教育理念,却显得越来越模糊。在微课、慕课出现之前,人们对数... 40年来,数字化课程从一种课程资源"升级"成为了课程本身。在迅速发展的背后,支撑数字化课程发展的各种教育信息化技术愈发清晰;但数字化课程究竟蕴含或体现了哪些教育理念,却显得越来越模糊。在微课、慕课出现之前,人们对数字化课程持一种谨慎好评的态度;而在此之后,人们对数字化课程的看法在好、坏两个方向上都更加极端,评价显得模糊。上述问题皆源于我们关注技术胜过关注"人",导致宏观研究未能结合实践,微观研究也未形成体系。未来关于数字化课程的研究,应在加大对"人"的关注的前提下,从宏观走向微观,从零散走向系统。 展开更多
关键词 数字化课程 课程资源 技术 理念 评价
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一种基于有限状态机的中文地址标准化方法 被引量:14
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作者 罗明 黄海量 《计算机应用研究》 CSCD 北大核心 2016年第12期3691-3695,共5页
由于中文的内涵多义性和形式多样性的特点,使中文地址长期以来存在着难以标准化的问题,对进一步开展地址定位、区域网格分析和社情、舆情定位等工作都造成了较大的障碍。针对这个问题提出了基于地址分级模型和有限状态机驱动的新方法,... 由于中文的内涵多义性和形式多样性的特点,使中文地址长期以来存在着难以标准化的问题,对进一步开展地址定位、区域网格分析和社情、舆情定位等工作都造成了较大的障碍。针对这个问题提出了基于地址分级模型和有限状态机驱动的新方法,并通过软件开发对这种方法的地址识别率和匹配准确率进行了验证,实验结果显示该方法对中文地址能够达到96%左右的识别率,匹配准确率也达到了85%左右,并且还能实现标准地址库的自动化更新。因此,采取该方法能够有效地解决中文地址标准化困难的问题,具有显著的实用性和研究参考价值。 展开更多
关键词 中文地址 地址编码 地址标准化 地址分级模型 地址匹配 有限状态机
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体外扩增人脐带血来源的NK细胞对食管癌细胞的促凋亡作用 被引量:7
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作者 连晶瑶 李红 +4 位作者 黄岚 李玉 邹亮燕 王纯耀 张毅 《中国肿瘤生物治疗杂志》 CAS CSCD 北大核心 2017年第2期117-121,共5页
目的:建立体外扩增人脐带血来源的NK细胞的方法,并研究其对多株人食管癌细胞系和食管癌患者原代肿瘤细胞的杀伤作用。方法:分离人脐带血单个核细胞,加入放射线灭活的人白血病K562细胞及IL-2、IL-15、IL-18细胞因子体外扩增培养2周,诱导N... 目的:建立体外扩增人脐带血来源的NK细胞的方法,并研究其对多株人食管癌细胞系和食管癌患者原代肿瘤细胞的杀伤作用。方法:分离人脐带血单个核细胞,加入放射线灭活的人白血病K562细胞及IL-2、IL-15、IL-18细胞因子体外扩增培养2周,诱导NK细胞。采用流式细胞术检测NK细胞的扩增效果及其产生的IFN-γ等细胞因子杀伤靶细胞K562的能力,并检测体外扩增的人脐带血来源NK细胞对多种食管癌细胞系和食管癌患者原代肿瘤细胞凋亡的影响。结果:利用放射线灭活的K562细胞联合多种细胞因子,可以有效的扩增人脐带血来源的NK细胞。体外培养2周后NK细胞比率可达80%左右,并对靶细胞K562有明显促凋亡作用。此外,体外扩增的人脐带血来源NK细胞能够促进6株人食管癌细胞系和食管癌患者原代肿瘤细胞的凋亡。结论:本研究建立了体外扩增人脐带血NK细胞的方法,并证实这些NK细胞对食管癌细胞的促凋亡作用,可能为食管癌的免疫治疗提供新的手段。 展开更多
关键词 食管癌 人脐带血 NK细胞 肿瘤细胞
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PREPARATION AND XRD STUDY OF LITHIUM DEFICIENT LiB COMPOUND 被引量:4
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作者 Z.J.Liu b.Y.huang Z.Y.Li 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第5期667-671,共5页
The LiB compounds in lithium deficient state were prepared by three methods and its crystal structure was investigated by using XRD. It is found that the lattice constant c of the compound will increase step by step w... The LiB compounds in lithium deficient state were prepared by three methods and its crystal structure was investigated by using XRD. It is found that the lattice constant c of the compound will increase step by step with decreasing Li content from 0.2796nm of the normal LiB to 0.2886, 0.2981 and 0.3118nm of the lithium deficient LiB. The change of the lattice constant is reversible. 展开更多
关键词 LiB compound crystal structure electrode materials X-ray diffraction
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EFFECTS OF ALLOYING ELEMENTS ON CREEP OF TiAl ALLOYS WITH FINELAMELLAR STRUCTURES 被引量:2
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作者 J.N.Wang, b.Y.huang and T.G.Nieh  National Key Laboratory for Powder Metallurgy, Central South University of Technology, Changsha 410083, China  Lawrence Livermore National Laboratory, P.O.box 808, Livermore, CA 94550, U.S.A. 《中国有色金属学会会刊:英文版》 CSCD 1999年第S1期263-273,共11页
Creep experiments have been conducted on five powder metallurgy TiAl alloys with fine grains (65~80 μm), fine lamellar spacings (0.1~0.16 μm), and different compositions [Ti 47Al(+Cr, Nb, Ta, W, Si)] at temperatur... Creep experiments have been conducted on five powder metallurgy TiAl alloys with fine grains (65~80 μm), fine lamellar spacings (0.1~0.16 μm), and different compositions [Ti 47Al(+Cr, Nb, Ta, W, Si)] at temperatures of 760 ℃ and 815 ℃ and stresses from 35 to 723 MPa. Results show that at a given lamellar spacing 1% Nb(mole fraction) with 1% Ta and replacing 0.2% Ta with 0.2% W induced little effect, but addition of 0.3% Si decreased the creep resistance by a factor of 3~4 under otherwise identical conditions. These different effects of different alloying elements are interpreted in terms of the interaction of alloy segregants with misfit and/or misorientaion dislocations at the lamellar interface. That is, the interaction retards or facilitates the climb of interfacial dislocations, which is rate controlling during creep, depending on the size of the segregants relative to the host atoms. 展开更多
关键词 TIAL alloys FINE LAMELLAR structures CREEP ALLOYING elements
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MED和WPT技术在轴承故障检测中的应用 被引量:1
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作者 张丹 隋文涛 黄雪梅 《组合机床与自动化加工技术》 北大核心 2016年第9期51-53,共3页
针对滚动轴承早期故障信息难以提取的问题,提出了一种基于最小熵卷积(MED)、小波包分解(WPT)和包络分析轴承故障检测技术,首先把采集的振动信号进行最小熵卷积处理,并根据包络谱稀疏度选择MED的滤波器长度。然后再将卷积后信号进行小波... 针对滚动轴承早期故障信息难以提取的问题,提出了一种基于最小熵卷积(MED)、小波包分解(WPT)和包络分析轴承故障检测技术,首先把采集的振动信号进行最小熵卷积处理,并根据包络谱稀疏度选择MED的滤波器长度。然后再将卷积后信号进行小波包分解,从所有的小波包节点中选择出包含故障敏感信息的节点。最后通过功率谱凸显轴承故障特征频率信息。通过实际信号对该方法进行了验证,结果表明该方法能够准确判明轴承运行状态。 展开更多
关键词 最小熵卷积 小波包分解 包络分析 轴承故障
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Experimental evidence for the formation mechanism of metallic catalyst-free carbon nanotubes 被引量:1
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作者 Y.H.Tang X.C.Li +3 位作者 J.L.Li L.W.Lin H.F.Xu b.Y.huang 《Nano-Micro Letters》 SCIE EI CAS 2010年第1期18-21,共4页
Our work reported that the so-called pure carbon nanotubes(CNTs)can be synthesized without metallic catalyst by chemical vapor deposition(CVD).The as-prepared CNTs have average diameter of 50 nm and length over severa... Our work reported that the so-called pure carbon nanotubes(CNTs)can be synthesized without metallic catalyst by chemical vapor deposition(CVD).The as-prepared CNTs have average diameter of 50 nm and length over several microns.Analysis of intermediate objects in the products indicates that their formation mechanism follows the wire-to-tube model.Besides,according to thermodynamic analysis of the driving force combing with experimental results,we find that the thermal gradient can effectively favor the formation of CNTs in our metallic catalyst-free CVD. 展开更多
关键词 Carbon nanotubes CATALYST-FREE CVD Formation mechanism
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Enhanced thermoelectric properties of SnSe thin films grown by pulsed laser glancing-angle deposition 被引量:1
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作者 Chun Hung Suen Dongliang Shi +9 位作者 Y.Su Zhi Zhang Cheuk Ho Chan Xiaodan Tang Y.Li Kwok Ho Lam Xinxin Chen b.L.huang X.Y.Zhou Ji-Yan Dai 《Journal of Materiomics》 SCIE EI 2017年第4期293-298,共6页
SnSe single crystals have been demonstrated to possess excellent thermoelectric properties.In this work,we demonstrate a grain size control method in growing nanocrystalline SnSe thin films through a glancing angle pu... SnSe single crystals have been demonstrated to possess excellent thermoelectric properties.In this work,we demonstrate a grain size control method in growing nanocrystalline SnSe thin films through a glancing angle pulsed-laser deposition approach.Structural characterization reveals that the SnSe film deposited at a normal angle has a preferred orientation along a axis,while by contrast,the SnSe film deposited at an 80glancing angle develops a nanopillar structure with the growth direction towards the incident atomic flux.The glancing angle deposition greatly reduces the grain size of the thin film due to a shadowing effect to the adatoms,resulting in significantly increased power factor for more than 100%.The maximum Seebeck coefficient and power factor are 498.5 mV=K and 18.5 mWcm^(-1)K^(-2),respectively.The enhancement of thermoelectric property can be attributed to the potential barrier scattering at grain boundaries owing to the reduced grain size and increased grain boundaries in the film.Given this enhanced power factor,and considering the fact that the nanopillar structure should have much lower thermal conductivity than a plain film,the zT value of such made SnSe film could be significantly larger than the corresponding single crystal film,making it a good candidate for thin film-based thermoelectric device. 展开更多
关键词 THERMOELECTRIC SnSe Glancing angle Potential barrier scattering
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