检索结果-南通市图书馆

IN sITU mETALLOGrAPHIC OBsErVAION OF THErmALCYCLING EFFECTs ON PHAsE TrANsFOrmATION IN Cu-zn-Al sHAPE mEmOrY ALLOY

Acta metallurgica sinica(English Letters) 1997年第3期10卷 157-165页

作者： m liu X.m.z.ang m.z. liuand r.s. liu(metal material Department, sichuan Union University, Chengdu 610065, China) (Institute of metal r.s.arch, Chinese Academy of sciences, shenyang 110015, China)

In this paper, an in situ metallographic video system was used to study the morphology in Cu-zn-Al shape memory alloy (smA) during thermal cycling phase tmnsforma-tion. There are seven different types of martensite morphology in Cu-zn-Al smA,i.e. plate, spean bamboo, noose, round-spot, line and dot-like martensites. During transformation and inverse-transformation, the thermoelastic martensites were r.s.ng and falling, growing and shrinking, splitting and merping. The growth patter.s.of thermoelastic martensite were divided into three types: fast growing, very slow ex-pansion and uniform automatic growth. Automatic growth appeared when ageing at a temperature below ms. The r.s.lt, for the first time, coofirmed Olson and Cohen,s suggestion that thermoelastic martensite may be automatically grown when ageing be-low ms. With increasing numbers of thermal cycling, both the memory recovery ratio (% )and memory recoverp degradation (%) degraded logarithmically. The degrada-tion was steep in the initial stage and then became more and more gradual in the middle and the final stages caused by the stabilisation of martensite. In the initial stage, vacancies assumed the controlling role, while dislocations took the major role in other.s.ages. The martensite transformation caused the intedeces to become bent and blurmd, but with increasing cycling numbers, the movements of interface had the same degradation effects as the memory recovery ratio curves. Under these conditions, we also found the martensites on one side of the intedece became reorientated and par-allel to the intedece. It was therefore concluded that the movement degradation of the interface and the appearance of bamboo like martensite induced the degradation of two way shape memory effect (TWmP).

关键词： in situ metallographic video study thermal cycling phase trans-formation the degradation of TWmE

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

reactive destabilization and bidirectional catalyzation for reversible hydrogen storage of LiBH_(4) by novel waxberry-like nano-additive assembled from ultrafine Fe_(3)O_(4) particles

引用

Journal of materials science & Technology 2024年第6期173卷 63-71页

作者： s.Wang m.H.Wu Y.Y.zhu z.L.Li Y.X.Yang Y.z.Li H.F.liu m.X.Gao Department of material science Shenzhen MSU-BIT UniversityShenzhen 518172China state Key Laboratory of silicon and Advanced semiconductor materials&school of materials science and Engineering Zhejiang UniversityHangzhou 310027China Institute of r.s.urces Utilization and rare Earth Development State Key Laboratory of Rare Metals Separation and Comprehensive UtilizationGuangdong Provincial Key Laboratory of Rare Earth Development and ApplicationGuangdong Academy of SciencesGuangzhou 510650China Institute of science and Technology for New Energy Xi’an Technological UniversityXi’an 710021China National supercomputing Center in shenzhen Shenzhen 518055China

LiBH_(4) containing 18.5 wt.%H_(2) is an attractive high-capacity hydrogen storage material,however,it suffers from high operation temperature and poor ***,a novel and low-cost bifunctional additive,waxberry-like Fe_(3)O_(4) secondary nanospher.s.assembled from ultrafine primary Fe_(3)O_(4) nanoparticles,is synthesized,which exhibits significant destabilization and bidirectional catalyzation towar.s.de)hydrogenation of LiBH_(4).With an optim.z.d addition of 30 wt.% waxberry-like Fe_(3)O_(4),the system initiated dehydrogenation below 100℃ and released a total of 8.1 wt.%H_(2) to 400℃.After 10 cycles,a capacity retention of 70% was achieved,greatly superior to previously reported oxides-modified *** destabilizing and catalyzing mechanisms of waxberry-like Fe_(3)O_(4) on LiBH_(4) were systematically analyzed by phase and micr.s.ructural evolutions during dehydrogenation and hydrogenation cycling as well as density functional theory(DFT)*** pr.s.nt work provides new insights in developing advanced nano-additives with unique structural and multifunctional designs towar.s.LiBH4 hydrogen storage.

关键词： LiBH_(4) Hydrogen storage Waxberry-like Fe_(3)O_(4) Destabilization Catalysis

来源：

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

Compr.s.ive property and energy absorption character.s.ic of interconnected porous mg-zn-Y alloys with adjusting Y addition

引用

Journal of magnesium and Alloys 2024年第1期12卷 171-185页

作者： J.A.liu s.J.liu B.Wang W.B.sun X.J.liu z.W.Han College of materials science and Engineering Key Laboratory of Automobile Materials(Ministry of Education)Jilin UniversityChangchun 130022PR China Key Laboratory of Bionic Engineering(ministry of Education) College of Biological and Agricultural EngineeringJilin UniversityChangchun130022PR China Weihai Institute for Bionics-Jilin University Weihai 264205PR China

In this study,interconnected porous mg-2zn-xY alloys with different phase compositions were prepared by various Y additions(x=0.4,3,and 6 wt.%)to adjust the compr.s.ive properties and energy absorption *** characterization methods were then applied to identify the micr.s.ructure of the porous mg-zn-Y and describe the details of the second *** tests were performed at room temperature(rT),200℃,and 300℃to study the impact of the Y addition and testing temperature on the compr.s.ive properties of the porous *** experimental r.s.lts showed that a high Y content promotes a micr.s.ructure refinement and increases the volume fraction of the second *** the Y content increases,different mg-zn-Y ternary phases appear:I-phase(mg_(3)zn_(6)Y),W-phase(mg_(3)zn_(3)Y_(2)),and LPsO phase(mg_(12)znY).When the Y content ranges between 0.4%and 6%,the compr.s.ive strength increases from 6.30mPa to 9.23 mPa,and the energy absorption capacity increases from 7.33 mJ/m^(3)to 10.97 mJ/m^(3)at rT,which is mainly attributed to the phase composition and volume fraction of the second ***,the average energy absorption efficiency is independent of the Y *** addition,the compr.s.ive deformation behaviors of the porous mg-zn-Y are altered by the testing *** compr.s.ive strength and energy absorption capacity of the porous mg-zn-Y decrease due to the softening effect of the high temperature on the *** deformation behaviors at different temperatur.s.are finally observed to reflect the failure mechanisms of the struts.

关键词： Porous magnesium rare earth elements micr.s.ructure Compr.s.ive behavior Energy absorption character.s.ic

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

micr.s.ructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with different pr.s.rain levels

引用

Journal of materials science & Technology 2024年第4期171卷 80-93页

作者： Y.H.zhang H.Li z.W.Yang X.liu Q.F.Gu state Key Laboratory of solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China shaanxi Key Laboratory of High-Performance Precision Forming Technology and Equipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(smA)is a promising material in the aer.s.ace field due to its wide transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subsequent heating to ***-temperature deformation pr.s.rain plays a pivotal role in shape memory properties tailoring of smA ***,micr.s.ructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)smA subjected to vari-ous pr.s.rain levels are still *** this end,micr.s.ructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with pr.s.rain levels of 8%-16%at-28℃(m_(s)+30℃)were *** r.s.lts demonstrate that the str.s.-strain curve of the specimen exhibits four distinct stages at a maximal pr.s.rain of 16%.Whereas stageⅡand stageⅢend at pr.s.rains of∼8%and∼12%,*** stageⅡ,the str.s.-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further growth of str.s.-induced martensite variants(sImVs),(001)compound twins are introduced as a r.s.lt of the(001)deformation twinning in str.s.-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Corr.s.ondingly,after.s.bsequent unloading and heating,a higher density ofraustenite twins form in the specimen with a larger pr.s.rain of 16%.With increasing pr.s.rain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%pr.s.rain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new sImVs,the further growth of existing sImVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated with the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy Wide transformation hyster.s.s Thermomechanical loading micr.s.ructure evolution shape memory behaviors str.s.-induced martensitic transformation Deformation twinning

来源：

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

sTCF conceptual design report (Volume 1): Physics & detector

引用

Frontiers of physics 2024年第1期19卷 1-154页

作者： m.Achasov X.C.Ai 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.Q.Li X.H.Li Y.Li Y.Y.Li z.J.Li H.Liang J.H.Liang Y.T.Liang G.r.Liao L.z.Liao Y.Liao C.X.Lin D.X.Lin X.s.Lin B.J.liu C.W.liu D.liu F.liu G.m.liu H.B.liu J.liu J.J.liu J.B.liu K.liu K.Y.liu K.liu L.liu Q.liu s.B.liu T.liu X.liu Y.W.liu Y.liu Y.L.liu z.Q.liu z.Y.liu z.W.liu I.Logashenko Y.Long C.G.Lu J.X.Lu N.Lu Q.F.Lü Y.Lu Y.Lu z.Lu P.Lukin F.J.Luo T.Luo X.F.Luo Y.H.Luo H.J.Lyu X.r.Lyu J.P.ma P.ma Y.ma Y.m.ma F.maas s.malde D.matvienko z.X.meng r.mitchell A.Nefediev Y.Nefedov s.L.Olsen Q.Ouyang P.Pakhlov G.Pakhlova X.Pan Y.Pan E.Passemar Y.P.Pei H.P.Peng L.Peng X.Y.Peng X.J.Peng K.Peters s.Pivovarov E.Pyata B.B.Qi Y.Q.Qi W.B.Qian Y.Qian C.F.Qiao J.J.Qin J.J.Qin L.Q.Qin X.s.Qin T.L.Qiu J.rademacker C.F.redmer H.Y.sang Anhui University Hefei 230039China Beihang University Beijing 100191China Budker Institute of Nuclear Physics Novosibirsk 630090Russia CAs Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Cavendish Laboratory University of CambridgeJJ Thomson AveCambridge CB30HEUnited Kingdom Central China Normal University Wuhan 430079China Central south University Changsha 410083China China University of Geosciences Wuhan 430074China China University of mining and Technology Xuzhou 221116China École Polytechnique Fédérale de Lausanne(EPFL) LausanneSwitzerland Fudan University Shanghai 200433China Goethe University Frankfurt D-60325 Frankfurt am MainGermany Guangxi Normal University Guilin 541004China Guangxi Uninversity Nanning 530004China Hangzhou Institute for Advanced study UCASHangzhou 310024China Hebei Normal University Shijiazhuang 050024China Hebei University Baoding 071002China Hefei University of Technology Hefei 230601China Helmholtz Institute mainz Staudinger Weg 18D-55099 MainzGermany Henan Normal University Xinxiang 453007China Henan University Kaifeng 475004China High Energy Physics Center Chung-Ang UniversitySeoul 06974Korea Higher.s.hool of Economy 11 Pokrovsky Bulvar Moscow 109028Russia Huangshan University Huangshan 245000China Hubei University of Automotive Technology Shiyan 442002China Hunan Normal University Changsha 410081China Hunan University of science and Technology Xiangtan 411201China Hunan University Changsha 410082China Indiana University BloomingtonIndiana 47405USA Inner mongolia University Hohhot 010021China Institute of Advanced science Facilities Shenzhen 518107China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Institute of modern Physics Chinese Academy of SciencesLanzhou 730000China Institute of Physics Academia SinicaTaipeiTaiwan 11529China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China Jilin University Changch

The superτ-charm facility(sTCF)is an electron–positron collider proposed by the Chinese particle physics *** 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 *** sTCF will produce a data sample about a factor of 100 larger than that of the pr.s.ntτ-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 *** sTCF project in China is under development with an extensive r&D *** document pr.s.nts the physics opportunities at the sTCF,describes conceptual designs of the sTCF detector.s.stem,and discusses future plans for detector r&D and physics case studies.

关键词： electron–positron collider tau-charm region high luminosity sTCF detector conceptual design

来源：

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

real-World Evidence of multiple Air Pollutants and mortality:A Pr.s.ective Cohort study in an Oldest-Old Population

引用

Environment & Health 2024年第1期2卷 23-33页

作者： Linxin liu Yi zeng John s.Ji Vanke school of Public Health and school of medicine Tsinghua UniversityBeijingChina 100084 Center for the study of Aging and Human Development School of MedicineDuke UniversityDurhamNorth Carolina 27710United States Center for Healthy Aging and Development studies National School of DevelopmentPeking UniversityBeijingChina 100091 Vanke school of Public Health Tsinghua UniversityBeijingChina 100084

We aimed to report real-world longitudinal ambient air pollutants levels compared to WHO Air Quality Guidelines(AQG)and analyze multiple air pollutants’joint effect on longevity,and the modification and confounding from the climate and urbanization with a focus on the *** study included 13,207 old participants with 73.3%aged 80 and beyond,followed up from 2008 to 2018 in 23 Chinese *** used the Cox-proportional hazar.s.model and quantile-based g-computation model to measure separate and joint effects of the multiple *** adjusted for climate and area economic factors based on a directed acyclic *** 2018,no participants met the WHO AQG for Pm_(2.5) and O_(3),and about one-third met the AQG for NO_(2).The hazard ratio(Hr)for mortality was 1.07(95%confidence interval-CI:1.05,1.09)per decile increase in all three pollutants,with Pm_(2.5) being the dominant contributor according to the quantile-based g-computation *** the three-pollutant model,the Hrs(95%CI)for Pm_(2.5) and NO_(2) were 1.27(1.25,1.3)and 1.08(1.05,1.12)per 10μg/m3 increase,*** oldest-old experienced a much lower mortality r.s. from air pollution compared to the *** mortality r.s. of Pm_(2.5) was higher in areas with higher annual average *** adjustment of road density considerably intensified the association between NO_(2) and *** ambient Pm_(2.5) and O_(3) levels in China exceeded the WHO AQG target *** pollutants coexposure,confounding,and modification of the district economic and climate factors should not be ignored in the association between air pollution and mortality.

关键词： air quality multiple exposures climate district economic health equity

来源：

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

A compact bimorph rotary piezoelectric actuator with custom.z.d small power.s.pply

引用

science China(Technological sciences) 2024年第4期67卷 1185-1195页

作者： DENG Jie liu DaQing WANG WeiYi liu YingXiang school of mechatronics and Engineering Harbin Institute of TechnologyHarbin 150001China

Inertial piezoelectric actuators are widely applied in precision devices with simple structure and accurate ***,existing inertial piezoelectric actuators still face the challenges of rollback motion and bulky power *** this work,an alternate excitation strategy and a custom.z.d small power.s.pply for a bimorph rotary piezoelectric actuator(BrPA)are proposed to solve the *** BrPA prototype is designed with a bipedal symmetrical structure,measuring 35 mm in height and 32 mm in diameter,which has a maximum rotation velocity of 0.247 rad/s and a r.s.lution of 0.66μ*** to the bipedal symmetrical structure,the friction directions between the driving feet and the rotor can be coordinated to suppr.s. the *** rollback ratio is almost zero when the phase difference of the exciting signal is set as 180°.The custom.z.d power.s.pply is designed and manufactured,whose size is 58 mm×56 mm×46 *** can output signals for the single step mode and the continuous mode,and they are adopted to excite BrPA to achieve a small stroke with one single step and a large stroke with continuous step,***,an experimental system for optical fiber alignment is developed based on the BrPA and the custom.z.d small power.s.pply,the experiment has verified the practicability of this work in the precision fields,especially in the miniaturized precision systems.

关键词： inertial piezoelectric actuator custom.z.d small power.s.pply single step mode continuous mode rollback suppr.s.ion miniaturized precision system

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Identification of the optimal doping position of hetero-atoms in chalcogen-doped Fe-N-C catalysts for oxygen reduction reaction

引用

Particuology 2024年第6期89卷 99-108页

作者： Weihao liu Huanhuan He Qingtao liu Xin Wan Jianglan shui school of materials science and Engineering Beihang UniversityBeijing100191China school of space and Environment Beihang UniversityBeijing102206China Tianmushan Laboratory Hangzhou310023China

The excellent oxygen reduction reaction(Orr)activity of Fe–N–C catalysts in acidic media makes them potential for low-cost proton exchange membrane fuel *** recent years,it has been shown that heteroatoms(B,O,s,P,Cl,F,etc.)can be used as electron-withdrawing groups to modulate the planar.s.ructure and electron distribution of the Fe–Nx active sites to achieve simultaneous improvement of catalytic activity and ***,the optimal location of the heteroatoms remains ***,taking chalcogen heteroatoms(s and se)as an example,we control the doping positions and investigate their effect on the Orr performance of the Fe–N–C *** first coordination shell of the iron single atom is identified as the optimal doping *** optim.z.d catalysts Fe–N_(3)se_(1)/NC and Fe–N_(3)se_(1)/NC demonstrate improved activity and stability in both half cells and fuel *** work provides insights into the enhancement mechanism of heteroatom doping in single-atom catalysts.

关键词： Oxygen reduction reaction Fe-N-C catalysts Hetero-atom doping Doping position Enhancement mechanism

来源：

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

An integrated microfluidic platform for nucleic acid testing

引用

micr.s.stems & Nanoengineering 2024年第3期10卷 181-194页

作者： Antao sun Petra Vopařilová Xiaocheng liu Bingqian Kou TomášŘezníček TomášLednický sheng Ni JiříKudr Ondřej zítka zdenka Fohlerová Petr Pajer Haoqing zhang Pavel Neužil ministry of Education Key Laboratory of micro and Nano systems for Aer.s.ace School of Mechanical EngineeringNorthwestern Polytechnical University127 West Youyi RoadXi’anShaanxi 710072P.R.China Department of Chemistry and Biochemistry Mendel University in BrnoZemědělská161300 BrnoCzech Republic ITD Tech s.r.o Osvoboditelů100573581 BohumínCzech Republic Central European Institute of Technology Brno University of TechnologyPurkyňova 123Brno 61200Czech Republic Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong Kong SARChina Department of microelectronics Faculty of Electrical Engineering and CommunicationBrno University of TechnologyTechnická3058/10Brno 61600Czech Republic military Health Institute U Vojenskénemocnice 120016200 Praha 6Czech Republic The Key Laboratory of Biomedical Information Engineering of ministry of Education School of Life Science and TechnologyXi’an Jiaotong UniversityXi’anShaanxi 710049P.R.China Bioinspired Engineering and Biomechanics Center(BEBC) Xi’an Jiaotong UniversityXi’an 710049P.R.China

This study pr.s.nts a rapid and versatile low-cost sample-to-answer.s.stem for.s.rs-CoV-2 *** system integrates the extraction and purification of nucleic acids,followed by amplification via either reverse transcriptionquantitative polymer.s. chain reaction(rT–qPCr)or reverse transcription loop-mediated isothermal amplification(rT–LAmP).By meeting diverse diagnostic and reagent needs,the platform yields testing r.s.lts that closely align with those of commercial rT-LAmP and rT‒qPCr *** advantages of our.s.stem include its speed and *** assay is completed within 28 min,including sample loading(5 min),ribonucleic acid(rNA)extraction(3 min),and rT-LAmP(20 min).The cost of each assay is≈$9.5,and this pricing is competitive against that of Food and Drug Administration(FDA)-approved commercial *** some rNA loss during on-chip extraction is observed,the platform maintains a potential limit of detection lower than 297 *** makes the system particularly useful in environments where centralized laboratories are either unavailable or inconveniently *** key feature is the platform’s versatility,allowing users to choose between rT‒qPCr or rT‒LAmP tests based on specific requirements.

关键词： testing maintain versatile

来源：

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

Quasi-2D weak lensing cosmological constraints using the PDF-sYm method

引用

science China(Physics,mechanics & Astronomy) 2024年第7期67卷 44-58页

作者： zhenjie liu Jun zhang Hekun Li zhi shen Cong liu Department of Astronomy Shanghai Jiao Tong UniversityShanghai 200240China shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240China shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China

Cosmic shear.s.atistics,such as the two-point correlation function(2PCF),can be evaluated with the PDF-sYm method instead of the traditional weighted-sum *** makes use of the full PDF information of the shear estimators,and does not require weightings on the shear estimators,which can in principle introduce additional systematic *** work pr.s.nts our constraints on s8and?mfrom the shear.s.ear correlations using the PDF-sYm *** data we use is from the z-band images of the Dark Energy Camera Legacy survey(DECa Ls),which covers about 10000 deg2with more than 100 million *** shear catalog is produced by the Fourier Quad method,and well tested on the real data itself with the field-distortion *** main approach is called quasi-2D as we do use the photo-z information of each individual galaxy,but without dividing the galaxies into redshift *** mainly use galaxy pairs within the redshift interval between 0.2 and 1.3,and the angular range from 4.7 to 180 *** analysis yields s8=0.762±0.026 and?m=0.234±0.075,with the baryon effects and the intrinsic alignments *** r.s.lts are robust against redshift *** check the consistency of our r.s.lts by deriving the cosmological constraints from auto-correlations ofγ1andγ2separately,and find that they are consistent with each other,but the constraints from theγ1component are much weaker than that fromγ*** implies a much worse data quality ofγ1,which is likely due to additional shear uncertainties caused by CCD electronics(according to the survey strategy of DECa Ls).We also perform a pure 2D analysis,which gives s8=0.81_(-0.04)^(+0.03)and?m=0.25_(-0.05)^(+0.06).Our findings demonstrate the potential of the PDF-sYm method for precision cosmology.

关键词： weak lensing shear.s.ear correlations cosmological parameters observations analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：