The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on20...The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 July 27.In this paper,we introduce the design and on-ground test results of the LEIA instrument.Using stateof-the-art Micro-Pore Optics(MPO),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is realized.An optical assembly composed of 36 MPO chips is used to focus incident X-ray photons,and four large-format complementary metal-oxide semiconductor(CMOS)sensors,each of size 6 cm×6 cm,are used as the focal plane detectors.The instrument has an angular resolution of 4’-8’(in terms of FWHM)for the central focal spot of the point-spread function,and an effective area of 2-3 cm2at 1 keV in essentially all the directions within the field of view.The detection passband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10-11erg s-1cm-2(about 1 milliCrab)with a 1000 s observation.The total weight of LEIA is 56 kg and the power is 85 W.The satellite,with a design lifetime of 2 yr,operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 minutes.LEIA is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation,and by optimizing the working setups of the instrumental parameters.In addition,LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available.展开更多
The strain rate()dependence of ultra-low temperature strength and ductility was investigated systematically on a cryogenic near alpha titanium alloy Ti-3Al-3Mo-3Zr-0.2Y additively manufactured by electron beam selecti...The strain rate()dependence of ultra-low temperature strength and ductility was investigated systematically on a cryogenic near alpha titanium alloy Ti-3Al-3Mo-3Zr-0.2Y additively manufactured by electron beam selective melting(EBSM).As increases under quasi-static tension at 77 and 20 K,ductility monotonically decreases when yield strength(YS)keeps ascending.As increases from 5.6×10-4 s-1 once by one order of magnitude,elongation-to-fracture declines from 20.0%to 16.5%and 15.7%at 20 K.However,unlike the regular monotone increase at 298 and 77 K,ultimate tensile strength(UTS)at 20 K rises to 1460 MPa first then drops to 1320 MPa.This study further examined how strain rate affects slipping,twinning and strain hardening behavior.The monotone increase in YS is primarily attributed to the increased CRSS for slips and the enhanced tendency of pyramidal〈a〉and〈c+a〉slipping and34°twinning at 20 K.On the other hand,the monotone decrease of ductility is essentially ascribed to the intensified deformation localization characterized by micro shear bands,multiple necking and single necking.More importantly,the mechanisms of abnormal UTS variation and disappearance of serration flow at 20 K are discussed in terms of strain hardening levels,degree of shear deformation localization and the interaction of slips and twins.This study provides deep insights into strain rate effect on cryogenic mechanical behavior of EBSM-built titanium alloy.展开更多
An extra-low interstitial near alpha alloy Ti-3Al-2Zr-2Mo(wt%) was fabricated by hydrogenation and thermomechanical consolidation(TMC) of the coarse and spherical pre-alloyed powder with particle sizes of 60 to 270 μ...An extra-low interstitial near alpha alloy Ti-3Al-2Zr-2Mo(wt%) was fabricated by hydrogenation and thermomechanical consolidation(TMC) of the coarse and spherical pre-alloyed powder with particle sizes of 60 to 270 μm. The coarse powder is a byproduct of pre-alloyed powder produced for selective laser and electron beam additive manufacturing. The TMC process involves powder compaction, fast sintering,in-situ dehydrogenation and an immediate hot extrusion to form a fully dense and fine-grained martensitic microstructure. Further dehydrogenation in vaccum at 700 °C converted the martensitic microstructure into an interwoven α/β microstructure which exhibited an improved yield strength, apparent necking and premature cracking at grain boundary α(αGB) ribbons. A further annealing of 880 ℃/1 h/AC led to the formation of a fine-grained α/βtcomposite structure, which achieved an enhance ultimate tensile strength of 835 MPa and excellent tensile ductility of 16.0%. Analysis of the deformation behavior of the alloy in different states revealed that the α/βtcomposite structures brought about an enhanced strain hardening capability by heterogeneous deformation effect of hard βtand soft α-laths, which inhibited the formation of microcracks and consequently improved the coordinated deformation.展开更多
Cultures throughout the world are associating with the rivers.People depend upon the rivers and their tributaries for food,water,transport,and many other aspects of their daily lives.Unfortunately,human beings have no...Cultures throughout the world are associating with the rivers.People depend upon the rivers and their tributaries for food,water,transport,and many other aspects of their daily lives.Unfortunately,human beings have not calculated the accurate lengths for the great rivers even today.The lengths of the rivers are very different in popular textbooks,magazines,atlases and encyclopedias,etc.To accurately determine the lengths of the principal rivers of the world,the combination of satellite image analysis and field investigations to the source regions is proposed in this paper.The lengths of the Nile,Amazon,Yangtze,Mississippi,Yellow,Ob,Yenisey,Amur,Congo and Mekong,with lengths over or close to 5000 km,were calculated using the proposed method.The results may represent the most reliable and accurate lengths of the principal rivers of the world that are currently achievable.展开更多
Introduction Operation target beam power of China Spallation Neutron Source(CSNS),as the China's first 100 kW beam power pulsed neutron source,is now larger than 80 kW.During the beam power upgrading process of CS...Introduction Operation target beam power of China Spallation Neutron Source(CSNS),as the China's first 100 kW beam power pulsed neutron source,is now larger than 80 kW.During the beam power upgrading process of CSNS to 50 kW from 2018 to 2019,many improvements have been made for the front end of CSNS.Results The improvements mainly focus on solving the problems of ion source instability and the radio frequency quadrupole(RFQ)sparking caused by the pre-chopped beam into RFQ.展开更多
Silica(SiO2)coating is finding increasing use as a means of improving the properties of ZnO nanomaterials.However,the current literature contains seemingly contradictory reports of the effect of such coatings on th...Silica(SiO2)coating is finding increasing use as a means of improving the properties of ZnO nanomaterials.However,the current literature contains seemingly contradictory reports of the effect of such coatings on their photoluminescence(PL)properties.Two types of ZnO nanorod(henceforth termed Types A and B)were synthesized using the same hydrothermal method(differing only in the chosen precursor concentrations),then subjected to the exact same SiO2-coating procedure.SiO2coating is seen to have a strikingly different effect on the Type A and B nanorod morphologies and their PL.In the case of Type A nanorods,(i.e.nanorods grown using high precursor concentrations),SiO2coating has no discernible morphological effect but causes an obvious increase in the intensity of the visible component within the PL emission.Type B nanorods(grown from 20-times less concentrated reactive solution),in contrast,show a very different response to SiO2coating:morphologically,they appear as many ZnO nanodots in the silica shell that surrounds the etched ZnO core,and their ultraviolet PL is boosted.Systematic investigation of the effects of various other post-treatments on the PL from Type A and B nanorods leads to the conclusion that the different responses to SiO2coating can be traced to the different nanorod growth chemistries–i.e.by precipitation from Zn(OH)2intermediates(Type A nanorods)or by direct reaction of Zn2+and OH−ions(Type B material).The present study advances our understanding both of the controlled synthesis and of routes to optimising the properties of bare and silica-coated ZnO nanomaterials for nanodevice applications.展开更多
To investigate the nature of theΨ(3770)resonance and to measure the cross section for e^+e^-→DD,a cross-section scan data sample,distributed among 41 center-of-mass energy points from 3.73 to 3.89 GeV,was taken with...To investigate the nature of theΨ(3770)resonance and to measure the cross section for e^+e^-→DD,a cross-section scan data sample,distributed among 41 center-of-mass energy points from 3.73 to 3.89 GeV,was taken with the BESIII detector operated at the BEPCII collider in the year 2010.By analyzing the large angle Bhabha scattering events,we measure the integrated luminosity of the data sample at each center-of-mass energy point.The total integrated luminosity of the data sample is 76.16±0.04±0.61 pb^-1,where the first uncertainty is statistical and the second systematic.展开更多
First evidence of a structure in the J/ψΛinvariant mass distribution is obtained from an amplitude analysis of■b-J/ψΛK-decays.The observed structure is consistent with being due to a charmonium pentaquark w...First evidence of a structure in the J/ψΛinvariant mass distribution is obtained from an amplitude analysis of■b-J/ψΛK-decays.The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect.Its mass and width are determined to be 4458:8±2:9t4:7-1:1 MeV and 17:3±6:5t8:0-5:7 MeV,respectively,where the quoted uncertainties are statistical and systematic.The structure is also consistent with being due to two resonances.In addition,the narrow excited■-states,N■(1690)and■(1820),are seen for the first time in a■b-decay,and their masses and widths are measured with improved precision.The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb-1,collected with the LHCb experiment at centre-of-mass energies of 7,8 and 13 TeV.展开更多
A first search for theΞbc+J/ψΞc+decay is performed by the LHCb experiment with a data sample of proton-proton collisions,corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass en...A first search for theΞbc+J/ψΞc+decay is performed by the LHCb experiment with a data sample of proton-proton collisions,corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7,8,and 13 TeV.Two peaking structures are seen with a local(global)significance of 4.3(2.8)and 4.1(2.4)standard deviations at masses of 6571 and 6694 MeV/c2,respectively.Upper limits are set on theΞ+bc baryon production cross-section times the branching fraction relative to that of the B+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 TeV,in theΞ+bc and in the B+c rapidity and transverse-momentum ranges from 2.0 to 4.5 and 0 to 20GeV/c,respectively.Upper limits are presented as a function of theΞ+bc mass and lifetime.展开更多
A search for the rare decays W+→Ds+γand Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity ...A search for the rare decays W+→Ds+γand Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W+→Ds+γand Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10−4and 2.1×10−3at 95%confidence level for the W+→Ds+γand Z→D0γdecay modes,respectively.This is the first reported search for the Z→D0γdecay,while the upper limit on the W+→D+sγbranching fraction improves upon the previous best limit.展开更多
A search for the rare decay B0→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresponding to an integrated luminosity of9 fb.No signific...A search for the rare decay B0→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresponding to an integrated luminosity of9 fb.No significant signal of the decay is observed and an upper limitof 1.1x 10-7at 90%confidence level is set on the branching fraction.展开更多
The first search for the doubly heavyΩ0bcbaryon and a search for the E0bcbaryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 T...The first search for the doubly heavyΩ0bcbaryon and a search for the E0bcbaryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb-1.The baryons are reconstructed via their decays toΛ+cπ-and E+cπ-.No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c2,in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/c.Upper limits are set on the ratio of theΩ0bcand E0bcproduction cross-section times the branching fraction toΛ+cπ-(E+cπ-)relative to that of theΛ0b(E0b)baryon,for different lifetime hypotheses,at 95%confidence level.The upper limits range from 0.5 x 10-4to 2.5 x 10-4for theΩ0bc→Λ+cπ-(E0bc→Λ+cπ-)decay,and from 1.4x 10-3to 6.9 x 10-3for theΩ0bc→E+cπ-(E0bc→E+cπ-)decay,depending on the considered mass and lifetime of theΩ0bc(E0bc)baryon.展开更多
Electrical capacitance tomography(ECT)was applied in measuring solids distribution in square circulating fluidized beds.The fluidization conditions varied from bubbling fluidized bed to circulating fluidized bed.In th...Electrical capacitance tomography(ECT)was applied in measuring solids distribution in square circulating fluidized beds.The fluidization conditions varied from bubbling fluidized bed to circulating fluidized bed.In the whole range of fluidization conditions,ECT was able to instantaneously provide the solids concentration and voids distributions in the fluidized beds.According to the acquired data from ECT and reconstructed image,different fluidization regimes can also be identified.展开更多
基金supported by the Einstein Probe project,a mission in the Strategic Priority Program on Space Science of CAS(grant Nos.XDA15310000,XDA15052100)in part been supported by the European Union’s Horizon 2020 Program under the AHEAD2020 project(grant No.871158).
摘要The Lobster Eye Imager for Astronomy(LEIA),a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe mission,was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on2022 July 27.In this paper,we introduce the design and on-ground test results of the LEIA instrument.Using stateof-the-art Micro-Pore Optics(MPO),a wide field of view of 346 square degrees(18.6°×18.6°)of the X-ray imager is realized.An optical assembly composed of 36 MPO chips is used to focus incident X-ray photons,and four large-format complementary metal-oxide semiconductor(CMOS)sensors,each of size 6 cm×6 cm,are used as the focal plane detectors.The instrument has an angular resolution of 4’-8’(in terms of FWHM)for the central focal spot of the point-spread function,and an effective area of 2-3 cm2at 1 keV in essentially all the directions within the field of view.The detection passband is 0.5-4 keV in soft X-rays and the sensitivity is2-3×10-11erg s-1cm-2(about 1 milliCrab)with a 1000 s observation.The total weight of LEIA is 56 kg and the power is 85 W.The satellite,with a design lifetime of 2 yr,operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 minutes.LEIA is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation,and by optimizing the working setups of the instrumental parameters.In addition,LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band,albeit with limited useful observing time available.
基金supported by the National Natural Science Foundation of China(No.52271026)the Applied Basic Re-search Program of Liaoning province(No.2023JH2/101300158)the Fundamental Research Fund for the Central Universities(No.N2202010).
摘要The strain rate()dependence of ultra-low temperature strength and ductility was investigated systematically on a cryogenic near alpha titanium alloy Ti-3Al-3Mo-3Zr-0.2Y additively manufactured by electron beam selective melting(EBSM).As increases under quasi-static tension at 77 and 20 K,ductility monotonically decreases when yield strength(YS)keeps ascending.As increases from 5.6×10-4 s-1 once by one order of magnitude,elongation-to-fracture declines from 20.0%to 16.5%and 15.7%at 20 K.However,unlike the regular monotone increase at 298 and 77 K,ultimate tensile strength(UTS)at 20 K rises to 1460 MPa first then drops to 1320 MPa.This study further examined how strain rate affects slipping,twinning and strain hardening behavior.The monotone increase in YS is primarily attributed to the increased CRSS for slips and the enhanced tendency of pyramidal〈a〉and〈c+a〉slipping and34°twinning at 20 K.On the other hand,the monotone decrease of ductility is essentially ascribed to the intensified deformation localization characterized by micro shear bands,multiple necking and single necking.More importantly,the mechanisms of abnormal UTS variation and disappearance of serration flow at 20 K are discussed in terms of strain hardening levels,degree of shear deformation localization and the interaction of slips and twins.This study provides deep insights into strain rate effect on cryogenic mechanical behavior of EBSM-built titanium alloy.
基金financially supported by the“Xing Liao Talent Plan”of Liaoning Province,China(No.XLYC1802080)the Fundamental Research Fund for the Central Universities(No.02080022117003)。
摘要An extra-low interstitial near alpha alloy Ti-3Al-2Zr-2Mo(wt%) was fabricated by hydrogenation and thermomechanical consolidation(TMC) of the coarse and spherical pre-alloyed powder with particle sizes of 60 to 270 μm. The coarse powder is a byproduct of pre-alloyed powder produced for selective laser and electron beam additive manufacturing. The TMC process involves powder compaction, fast sintering,in-situ dehydrogenation and an immediate hot extrusion to form a fully dense and fine-grained martensitic microstructure. Further dehydrogenation in vaccum at 700 °C converted the martensitic microstructure into an interwoven α/β microstructure which exhibited an improved yield strength, apparent necking and premature cracking at grain boundary α(αGB) ribbons. A further annealing of 880 ℃/1 h/AC led to the formation of a fine-grained α/βtcomposite structure, which achieved an enhance ultimate tensile strength of 835 MPa and excellent tensile ductility of 16.0%. Analysis of the deformation behavior of the alloy in different states revealed that the α/βtcomposite structures brought about an enhanced strain hardening capability by heterogeneous deformation effect of hard βtand soft α-laths, which inhibited the formation of microcracks and consequently improved the coordinated deformation.
基金supported by China High-Tech Research and Development Project(863 Project)the Innovation Project of Chinese Academy of Sciences,the Special Funds of Director General of Institute of Remote Sensing Applications,Chinese Academy of Sciences,the Funds of the State Key Laboratory of Remote Sensing Sciences of Chinathe Funds of the State Key Laboratory of Information Engineering in Surveying,Mapping and Remote Sensing of China and Earth&Space Awards of the Earth and Space Foundation.
摘要Cultures throughout the world are associating with the rivers.People depend upon the rivers and their tributaries for food,water,transport,and many other aspects of their daily lives.Unfortunately,human beings have not calculated the accurate lengths for the great rivers even today.The lengths of the rivers are very different in popular textbooks,magazines,atlases and encyclopedias,etc.To accurately determine the lengths of the principal rivers of the world,the combination of satellite image analysis and field investigations to the source regions is proposed in this paper.The lengths of the Nile,Amazon,Yangtze,Mississippi,Yellow,Ob,Yenisey,Amur,Congo and Mekong,with lengths over or close to 5000 km,were calculated using the proposed method.The results may represent the most reliable and accurate lengths of the principal rivers of the world that are currently achievable.
摘要Introduction Operation target beam power of China Spallation Neutron Source(CSNS),as the China's first 100 kW beam power pulsed neutron source,is now larger than 80 kW.During the beam power upgrading process of CSNS to 50 kW from 2018 to 2019,many improvements have been made for the front end of CSNS.Results The improvements mainly focus on solving the problems of ion source instability and the radio frequency quadrupole(RFQ)sparking caused by the pre-chopped beam into RFQ.
基金Financial support for this work was provided by the National Natural Science Foundation of China(grant no.11104046)the National Basic Research Program of China(973 Program)(grant no.2013CB632900)the Fundamental Research Funds for the Central University(grant no.HIT.BRETIII.201216,HIT.BRETIII.201225 and HIT.BRETIV.201313)。
摘要Silica(SiO2)coating is finding increasing use as a means of improving the properties of ZnO nanomaterials.However,the current literature contains seemingly contradictory reports of the effect of such coatings on their photoluminescence(PL)properties.Two types of ZnO nanorod(henceforth termed Types A and B)were synthesized using the same hydrothermal method(differing only in the chosen precursor concentrations),then subjected to the exact same SiO2-coating procedure.SiO2coating is seen to have a strikingly different effect on the Type A and B nanorod morphologies and their PL.In the case of Type A nanorods,(i.e.nanorods grown using high precursor concentrations),SiO2coating has no discernible morphological effect but causes an obvious increase in the intensity of the visible component within the PL emission.Type B nanorods(grown from 20-times less concentrated reactive solution),in contrast,show a very different response to SiO2coating:morphologically,they appear as many ZnO nanodots in the silica shell that surrounds the etched ZnO core,and their ultraviolet PL is boosted.Systematic investigation of the effects of various other post-treatments on the PL from Type A and B nanorods leads to the conclusion that the different responses to SiO2coating can be traced to the different nanorod growth chemistries–i.e.by precipitation from Zn(OH)2intermediates(Type A nanorods)or by direct reaction of Zn2+and OH−ions(Type B material).The present study advances our understanding both of the controlled synthesis and of routes to optimising the properties of bare and silica-coated ZnO nanomaterials for nanodevice applications.
基金Supported by National Key Basic Research Program of China(2015CB856700)National Natural Science Foundation of China(NSFC)(11235011,11335008,11425524,11625523,11635010)+13 种基金the Chinese Academy of Sciences(CAS)Large-Scale Scientific Facility Programthe CAS Center for Excellence in Particle Physics(CCEPP)Joint Large-Scale Scientific Facility Funds of the NSFCCAS(U1332201,U1532257,U1532258)CAS Key Research Program of Frontier Sciences(QYZDJ-SSW-SLH003,QYZDJ-SSW-SLH040)100 Talents Program of CASNational 1000 Talents Program of China,INPACShanghai Key Laboratory for Particle Physics and Cosmology,German Research Foundation DFG under Contracts Nos.Collaborative Research Center CRC 1044,FOR 2359Istituto Nazionale di Fisica Nucleare,Italy,Koninklijke Nederlandse Akademie van Wetenschappen(KNAW)(530-4CDP03)Ministry of Development of Turkey(DPT2006K-120470)National Science and Technology fundThe Swedish Research Council,U.S.Department of Energy(DEFG02-05ER41374,DE-SC-0010118,DE-SC-0010504,DE-SC-0012069)University of Groningen(RuG)and the Helmholtzzentrum fuer Schwerionenforschung GmbH(GSI)Darmstadt,WCU Program of National Research Foundation of Korea(R32-2008-000-10155-0)
摘要To investigate the nature of theΨ(3770)resonance and to measure the cross section for e^+e^-→DD,a cross-section scan data sample,distributed among 41 center-of-mass energy points from 3.73 to 3.89 GeV,was taken with the BESIII detector operated at the BEPCII collider in the year 2010.By analyzing the large angle Bhabha scattering events,we measure the integrated luminosity of the data sample at each center-of-mass energy point.The total integrated luminosity of the data sample is 76.16±0.04±0.61 pb^-1,where the first uncertainty is statistical and the second systematic.
摘要First evidence of a structure in the J/ψΛinvariant mass distribution is obtained from an amplitude analysis of■b-J/ψΛK-decays.The observed structure is consistent with being due to a charmonium pentaquark with strangeness with a significance of 3.1r including systematic uncertainties and lookelsewhere effect.Its mass and width are determined to be 4458:8±2:9t4:7-1:1 MeV and 17:3±6:5t8:0-5:7 MeV,respectively,where the quoted uncertainties are statistical and systematic.The structure is also consistent with being due to two resonances.In addition,the narrow excited■-states,N■(1690)and■(1820),are seen for the first time in a■b-decay,and their masses and widths are measured with improved precision.The analysis is performed using pp collision data corresponding to a total integrated luminosity of 9 fb-1,collected with the LHCb experiment at centre-of-mass energies of 7,8 and 13 TeV.
基金The project support from CERN and from the national agencies:CAPES,CNPq,FAPERJ and FINEP(Brazil)MOST and NSFC(China)+18 种基金CNRS/IN2P3(France)BMBF,DFG and MPG(Germany)INFN(Italy)NWO(Netherlands)MNiSW and NCN(Poland)MEN/IFA(Romania)MICINN(Spain)SNSF and SER(Switzerland)NASU(Ukraine)STFC(United Kingdom)DOE NP and NSF(USA).We acknowledge the computing resources that are provided by CERN,IN2P3(France),KIT and DESY(Germany),INFN(Italy),SURF(Netherlands),PIC(Spain),GridPP(United Kingdom),CSCS(Switzerland),IFIN-HH(Romania),CBPF(Brazil),Polish WLCG(Poland)and NERSC(USA).Individual groups or members have received support from ARC and ARDC(Australia)Minciencias(Colombia)AvH Foundation(Germany)EPLANET,Marie Sklodowska-Curie Actions and ERC(European Union)A*MIDEX,ANR,IPhU and Labex P2IO,and Région Auvergne-RhôneAlpes(France)Key Research Program of Frontier Sciences of CAS,CAS PIFI,CAS CCEPP,Fundamental Research Funds for the Central Universities,and Sci.&Tech.Program of Guangzhou(China)GVA,XuntaGal,GENCAT and Prog.Atracción Talento,CM(Spain)SRC(Sweden)the Leverhulme Trust,the Royal Society and UKRI(United Kingdom).
摘要A first search for theΞbc+J/ψΞc+decay is performed by the LHCb experiment with a data sample of proton-proton collisions,corresponding to an integrated luminosity of 9 fb−1 recorded at centre-of-mass energies of 7,8,and 13 TeV.Two peaking structures are seen with a local(global)significance of 4.3(2.8)and 4.1(2.4)standard deviations at masses of 6571 and 6694 MeV/c2,respectively.Upper limits are set on theΞ+bc baryon production cross-section times the branching fraction relative to that of the B+c→J/ψD+s decay at centre-of-mass energies of 8 and 13 TeV,in theΞ+bc and in the B+c rapidity and transverse-momentum ranges from 2.0 to 4.5 and 0 to 20GeV/c,respectively.Upper limits are presented as a function of theΞ+bc mass and lifetime.
摘要A search for the rare decays W+→Ds+γand Z→D0γis performed using proton-proton collision data collected by the LHCb experiment at a centre-of-mass energy of 13TeV,corresponding to an integrated luminosity of 2.0fb−1.No significant signal is observed for either decay mode and upper limits on their branching fractions are set using W+→Ds+γand Z→μ+μ−decays as normalization channels.The upper limits are 6.5×10−4and 2.1×10−3at 95%confidence level for the W+→Ds+γand Z→D0γdecay modes,respectively.This is the first reported search for the Z→D0γdecay,while the upper limit on the W+→D+sγbranching fraction improves upon the previous best limit.
基金support from AvH Foundation(Germany)EPLANET,Marie Sk lodowska-Curie Actions and ERC(European Union)+11 种基金A*MIDEXANRLabex P2IOOCEVURégion Auvergne-Rh?ne-Alpes(France)Key Research Program of Frontier Sciences of CASCAS PIFIThousand Talents ProgramSci.&Tech.Program of Guangzhou(China)RFBR,RSF and Yandex LLC(Russia)GVA,Xunta Gal and GENCAT(Spain)the Royal Society and the Leverhulme Trust(United Kingdom)。
摘要A search for the rare decay B0→J/ψФis performed using Pp collision data collected with the LHCb dete-ctor at centre-of-mass energies of 7,8 and 13 TeV,corresponding to an integrated luminosity of9 fb.No significant signal of the decay is observed and an upper limitof 1.1x 10-7at 90%confidence level is set on the branching fraction.
基金CAPES,CNPq,FAPERJ and FINEP(Brazil)MOST and NSFC(China)+18 种基金CNRS/IN2P3(France)BMBF,DFG,MPG(Germany)INFN(Italy)NWO(Netherlands)MNiSW,NCN(Poland)MEN/IFA(Romania)MSHE(Russia)MICINN(Spain)SNSF,SER(Switzerland)NASU(Ukraine)STFC(United Kingdom)DOE NP,NSF(USA).We acknowledge the computing resources that are provided by CERN,IN2P3(France),KIT and DESY(Germany),INFN(Italy),SURF(Netherlands),PIC(Spain),GridPP(United Kingdom),RRCKI and Yandex LLC(Russia),CSCS(Switzerland),IFIN-HH(Romania),CBPF(Brazil),PL-GRID(Poland)and NERSC(USA)AvH Foundation(Germany)EPLANET,Marie Sklodowska-Curie Actions and ERC(European Union)A*MIDEX,ANR,Labex P2IO and OCEVU,Region Auvergne-Rhdne-Alpes(France)Key Research Program of Frontier Sciences of CAS,CAS PIFI,CAS CCEPP,Fundamental Research Funds for the Central Universities,and Sci.Tech.Program of Guangzhou(China)RFBR,RSF and Yandex LLC(Russia)GVA,XuntaGal,GENCAT(Spain)the Leverhulme Trust,the Royal Society and UKRI(United Kingdom)。
摘要The first search for the doubly heavyΩ0bcbaryon and a search for the E0bcbaryon are performed using pp collision data collected via the LHCb experiment from 2016 to 2018 at a centre-of-mass energy of 13 TeV,corresponding to an integrated luminosity of 5.2 fb-1.The baryons are reconstructed via their decays toΛ+cπ-and E+cπ-.No significant excess is fbund for invariant masses between 6700 and 7300 MeV/c2,in a rapidity range from 2.0 to 4.5 and a transverse momentum range from 2 to 20 MeV/c.Upper limits are set on the ratio of theΩ0bcand E0bcproduction cross-section times the branching fraction toΛ+cπ-(E+cπ-)relative to that of theΛ0b(E0b)baryon,for different lifetime hypotheses,at 95%confidence level.The upper limits range from 0.5 x 10-4to 2.5 x 10-4for theΩ0bc→Λ+cπ-(E0bc→Λ+cπ-)decay,and from 1.4x 10-3to 6.9 x 10-3for theΩ0bc→E+cπ-(E0bc→E+cπ-)decay,depending on the considered mass and lifetime of theΩ0bc(E0bc)baryon.
摘要Electrical capacitance tomography(ECT)was applied in measuring solids distribution in square circulating fluidized beds.The fluidization conditions varied from bubbling fluidized bed to circulating fluidized bed.In the whole range of fluidization conditions,ECT was able to instantaneously provide the solids concentration and voids distributions in the fluidized beds.According to the acquired data from ECT and reconstructed image,different fluidization regimes can also be identified.