检索结果-南通市图书馆

维普期刊数据库博看期刊

Security of quantum key distribution with virtual mutually unbiased bases

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第7期67卷 13-21页

作者： Hong-Wei Li Chen-Peng Hao zhi-Jiang Chen Li Gong Yi-Fei Lu Yang Wang Jia-Ji Li Chun-Mei Zhang Rong Wang Zhen-qiang Yin Qing-Yu Cai henan Key Laboratory of Quantum Information and Cryptography SSF IEUZhengzhou 450000China Institute of Quantum Information and Technology Nanjing University of Posts and TelecommunicationsNanjing 210003China Department of Physics University of Hong KongHong Kong 999077China Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China School of Information and Communication Engineering Hainan UniversityHaikou 570228China

In a perfect quantum key distribution(QKD)protocol,quantum states should be prepared and measured with mutually unbiased bases(MUBs).However,in a practical QKD system,quantum states are generally prepared and measured with imperfect MUBs using imperfect devices,possibly reducing the secret key rate and transmission *** analyze the security of a QKD system with imperfect MUBs,we propose virtual MUBs to characterize the quantum channel against collective attack,and analyze the corresponding secret key rate under imperfect state preparation and measurement *** generally,we apply the advantage distillation method for analyzing the security of QKD with imperfect MUBs,where the error tolerance and transmission distance can be sharply *** analysis method can be applied to benchmark and standardize a practical QKD system,elucidating the security analysis of different QKD protocols with imperfect devices.

关键词： quantum key distribution mutually unbiased bases advantage distillation

Direct measurement of the break-out ^(19)F(p,γ)^(20)Ne reaction in the China Jinping underground laboratory(CJPL)

在线全文

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2024年第8期35卷 142-152页

作者： Yin‑Ji Chen Hao Zhang Li‑Yong Zhang Jian‑Jun he Richard James deBoer Michael Wiescher Alexander heger David Kahl Jun Su Daniel Odell Xin‑Yue Li Jian‑Guo Wang Long Zhang Fu‑qiang Cao zhi‑Cheng Zhang Xin‑zhi Jiang Luo‑Huan Wang Zi‑Ming Li Lu‑Yang Song Liang‑Ting Sun Qi Wu Jia‑Qing Li Bao‑Qun Cui Li‑Hua Chen Rui‑Gang Ma Er‑Tao Li Gang Lian Yao‑De Sheng zhi‑Hong Li Bing Guo Wei‑Ping Liu Key Laboratory of Beam Technology of the Ministry of Education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing 100875China Department of Physics and Astronomy The Joint Institute for Nuclear AstrophysicsUniversity of Notre DameNotre DameIN 46556USA School of Physics and Astronomy Monash UniversityClaytonVIC 3800Australia Facility for Rare Isotope Beams Michigan State UniversityEast LansingMI 48824USA Institute of Nuclear and Particle Physics and Department of Physics and Astronomy Ohio UniversityAthensOH 45701USA Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China China Institute of Atomic Energy Beijing 102413China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China College of Science Southern University of Science and TechnologyShenzhen 518055China Institute of Radiation Technology Beijing Academy of Science and TechnologyBeijing 100875China Key Laboratory of Nuclear Physics and Ion‑Beam Application(MOE) Institute of Modern PhysicsFudan UniversityShanghai 200433China School of Mathematics and Physics Handan UniversityHandan 056005China

Calcium production and the stellar evolution of first-generation stars remain fascinating mysteries in *** one possible nucleosynthesis scenario,break-out from the hot carbon–nitrogen–oxygen(HCNO)cycle was thought to be the source of the calcium observed in these oldest ***,according to the stellar modeling,a nearly tenfold increase in the thermonuclear rate ratio of the break-out ^(19)F(p,γ)^(20) Ne reaction with respect to the competing ^(19)F(p,α)^(16) O back-processing reaction is required to reproduce the observed calcium *** performed a direct measurement of this break-out reaction at the China Jinping underground *** measurement was performed down to the low-energy limit of E_(c.m.)=186 keV in the center-of-mass *** key resonance was observed at 225.2 keV for the first *** a temperature of approximately 0.1 GK,this new resonance enhanced the thermonuclear ^(19)F(p,γ)^(20) Ne rate by up to a factor of≈7.4,compared with the previously recommended NACRE *** is of particular interest to the study of the evolution of the first stars and implies a stronger breakdown in their“warm”CNO cycle through the ^(19)F(p,γ)^(20) Ne reaction than previously *** break-out resulted in the production of the calcium observed in the oldest stars,enhancing our understanding of the evolution of the first stars.

关键词： Nuclear astrophysics First stars Abundance of calcium Reaction cross section Reaction rate China Jinping underground laboratory(CJPL) JUNA

Influence of oxygen-rich hot air composite gas medium on sintering performance and function mechanism

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2024年第5期31卷 1071-1081页

作者： Min Gan Hao-xiang Zheng Xiao-hui Fan zhi-yun Ji qiang Li Ming Wu Yi-fan Wang Xiao-long Wang Yu-feng Wu Xu-ling Chen Zeng-qing Sun Xiao-xian Huang School of Minerals Processing and Bioengineering Central South UniversityChangsha410083HunanChina Shanxi Taigang Stainless Steel Co. Ltd.Taiyuan030003ShanxiChina

Hot air sintering technology is used to improve the quality and production efficiency of sintered ***,the current thick layer condition highlights the disadvantage of the low oxygen potential of the hot air sintering ***,it is considered to use oxygen enrichment sintering to improve the environment of hot air *** sintering,hot air sintering,and oxygen-rich hot air sintering were compared through sintering cup experiments,and the influence of hot air and oxygen-rich hot air on sintering indexes was *** air reduced the vertical sintering velocity,while improved the yield and tumbler ***-rich hot air sintering contributed to improving the vertical sintering velocity while ensuring the quality of sintered ore,thus comprehensively improving production *** the action of hot air,the highest temperature of the sintering layer increased and the high-temperature holding time was *** oxygen enrichment,the combustion efficiency of fuels in the upper layer of materials was promoted,which optimized heat distribution in the middle and lower layers of materials and increased the content of calcium ferrite in the sintered ore,thus strengthening the sintering process.

关键词： Iron ore sintering Hot air sintering Oxygen enrichment Function mechanism

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

分级车辆火灾下吊索系统的抗火性能计算方法

中国公路学报 2024年第9期37卷 1-16页

作者：刘志李国强同济大学土木工程学院上海200092 同济大学土木工程防灾减灾全国重点实验室上海200092

为计算车辆火灾下悬索桥吊索系统的抗火性能,将桥梁车辆火灾分为五级:第一、二级为乘用车火灾,第三、四级为货车火灾,第五级为油罐车火灾,采用不同的最大热释放速率和最大燃烧时长对其进行表征。根据已有的车辆火灾试验,验证该分级方法... 详细信息

为计算车辆火灾下悬索桥吊索系统的抗火性能,将桥梁车辆火灾分为五级:第一、二级为乘用车火灾,第三、四级为货车火灾,第五级为油罐车火灾,采用不同的最大热释放速率和最大燃烧时长对其进行表征。根据已有的车辆火灾试验,验证该分级方法的合理性,并结合车辆火灾事故,建立第三、四、五级车辆火灾火源的几何特征。采用圆柱火焰辐射体模型,计算乘用车火灾的空间辐射热流密度,并得到3例足尺汽车火灾试验的验证;采用棱柱火焰辐射体模型,计算货车火灾的空间辐射热流密度;采用经液化天然气池火试验验证的计算流体动力学方法,计算有横风时油罐车火灾下吊索表面的空间热流密度包络;推导了吊索截面在辐射热流密度边界条件下的增量法升温计算公式,并得到了有限元模型的验证。根据已有的高强钢丝高温力学性能试验,基于吊索在火灾下的承载能力极限状态,提出了吊索临界温度与吊索设计安全系数的函数关系。最后,整合上述研究结果,提出了分级车辆火灾下吊索系统抗火性能的五步计算方法,可为悬索桥吊索系统的抗火安全评定与设计提供参考。

关键词：桥梁工程车辆火灾理论分析吊索系统抗火性能悬索桥

Chromosome-level genome assembly of the glass catfish(Kryptopterus vitreolus)reveals molecular clues to its transparent phenotype

在线全文

学校读者我要写书评

暂无评论

Zoological Research 2024年第5期45卷 1027-1036页

作者： Chao Bian Rui-Han Li zhi-qiang Ruan Wei-Ting Chen Yu Huang Li-Yue Liu Hong-Ling Zhou Cheong-Meng Chong Xi-Dong Mu Qiong Shi Laboratory of Aquatic Genomics College of Life Sciences and OceanographyShenzhen UniversityShenzhenGuangdong 518057China Key Laboratory of Prevention and Control for Aquatic Invasive Alien Species Ministry of Agriculture and Rural AffairsGuangdong Modern.Recreational Fisheries Engineering Technology CenterPearl River Fisheries Research InstituteChinese Academy of Fishery SciencesGuangzhouGuangdong 510380China Shenzhen Key Lab of Marine Genomics Guangdong Provincial Key Lab of Molecular Breeding in Marine Economic AnimalsBGI Academy of Marine SciencesBGI MarineShenzhenGuangdong 518081China CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization&Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province Chengdu Institute of BiologyChinese Academy of SciencesChengduSichuan 610041China School of Life Sciences Jiaying UniversityMeizhouGuangdong 514015China China Zebrafish Resource Center National Aquatic Biological Resource CenterState Key Laboratory of Freshwater Ecology and BiotechnologyInstitute of HydrobiologyChinese Academy of ScienceWuhanHubei 430072China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhenGuangdong 518116China State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacaoMacao 999078China Center for Aquatic Genomics College of Life SciencesNeijiang Normal UniversityNeijiangSichuan 641100China

Glass catfish(Kryptopterus vitreolus)are notable in the aquarium trade for their highly transparent body *** transparency is due to the loss of most reflective iridophores and light-absorbing melanophores in the main body,although certain black and silver pigments remain in the face and *** date,however,the molecular mechanisms underlying this transparent phenotype remain largely *** explore the genetic basis of this transparency,we constructed a chromosome-level haplotypic genome assembly for the glass catfish,encompassing 32 chromosomes and 23344 protein-coding genes,using PacBio and Hi-C sequencing technologies and standard assembly and annotation *** revealed a premature stop codon in the putative albinism-related tyrp1b gene,encoding tyrosinase-related protein 1,rendering it a nonfunctional ***,a synteny comparison with over 30 other fish species identified the loss of the endothelin-3(edn3b)gene in the glass catfish *** investigate the role of edn3b,we generated edn3b^(−/−)mutant zebrafish,which exhibited a remarkable reduction in black pigments in body surface stripes compared to wild-type *** findings indicate that edn3b loss contributes to the transparent phenotype of the glass *** high-quality chromosome-scale genome assembly and identification of key genes provide important molecular insights into the transparent phenotype of glass *** findings not only enhance our understanding of the molecular mechanisms underlying transparency in glass catfish,but also offer a valuable genetic resource for further research on pigmentation in various animal species.

关键词： Glass catfish Whole-genome sequencing edn3b−/−mutant Transparent phenotype

Magnetostratigraphy and paleoenvironmental record of late Cenozoic sediments in the Taiyuan Basin,North China

在线全文

学校读者我要写书评

暂无评论

Journal of Palaeogeography 2024年第4期13卷 971-992页

作者： zhi-qiang Feng Qian LI Wei Han Kun-Yuan Ma Yong-Jiang Liu Rong-Zhu Wei Yan-Wei Du Yong Lei Guang-Hui Li College of Geoscience and Geomatics Engineering Taiyuan University of Technology Shanxi Institute of Geological Survey Frontiers Science Center for Deep Ocean Multispheres and Earth System Key Lab of Submarine Geoscience and Prospecting TechniquesCollege of Manine GeosciencesOcean University of China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and Technology College of Resources and Environment Shanxi Agricultural University Department of Information Engineering Shanxi University

The Taiyuan Basin is of importance for intraplate tectonic deformation in North China and contains Cenozoic strata with a maximum thickness of 3800 m.A～853.5-m-deep borehole (ZK01) with an overall core recovery rate of 85.09%was drilled at Yuci (37°35'37?N,112°39'47?E) in the central Taiyuan Basin,to obtain high-resolution records of paleomagnetism,paleoclimatic and paleoenvironmental conditions,and depositional environment of the *** obtained magnetic polarity sequence consists of 13 normal and 12 reverse zones,which correspond to C1n-C4An.2n of the geomagnetic polarity time *** data show that the evolution of ZK01 core covers the interval from 8.1 Ma to the present,and the bottoms of Pliocene,Quaternary,and Middle Pleistocene were identified in Taiyuan Basin,with a sedimentary accumulation rate ranging from 62.5 m/Ma to 175.9 m/*** data reveal that the source rocks in the study area underwent intense weathering and the sediments mainly formed in a semi-arid and oxygen-rich *** addition,paleoclimatic changes occurred at～7 Ma,3.8 Ma,and 1.7 Ma,which can be closely related to the tectonic uplift of the Loess Plateau and Tibetan Plateau,as well as the variations in the Asian monsoon and associated regional and global climatic change.

关键词： Taiyuan Basin Core sediment Magnetostratigraphy Climate change Paleoenvironment Quaternary

Stratigraphic framework and sedimentary evolution during the Cryogenian-Ediacaran transition in northeastern Sichuan Basin,South China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Petroleum Science 2024年第2期21卷 823-835页

作者： Yi Zhang Hong-Wei Kuang Yong-Qing Liu qiang Shi Dong-Ge Wang Ke-Ning Qi Yu-Chong Wang Da-Wei Qiao Xiao-Shuai Chen Li-zhi Wu Meng Tian Long Chen Yi Wei Liao-Yuan Song Jian Li Zi-Gang Wu Yun-Qian Liu Xuan-Chun Liu An-Qing Chen zhi-Wei Liao Institute of Geology Chinese Academy of Geological SciencesBeijing100037China State Key Laboratory of Coal Mine Disaster Dynamics and Control School of Resources and Safety EngineeringChongqing UniversityChongqing400044China No.205 Geological Team Chongqing Bureau of Geology and Minerals ExplorationChongqing401121China Chongqing Institute of Geological Survey Chongqing401122China Key Laboratory of Deep-time Geography and Environment Reconstruction and Applications of Ministry of Natural Resources Chengdu University of TechnologyChengdu610059SichuanChina

The northeastern Sichuan area in the northern Yangtze margin has unique Ediacaran geological records,especially the Doushantuo Formation(DST),and become a hot research area in recent ***,the Cryogenian-Ediacaran(C-E)boundary has not been precisely identified,which restricts the in-depth study of geological information during this crucial transitional period and is unfavorable for a systematic and complete understanding of the Yangtze Block and even the global paleogeographic *** study conducted stratigraphy,sedimentology,and chronostratigraphy to establish the stratigraphic framework and sedimentary evolution of the C-E transition strata in northeastern *** results showed that the Ediacaran sediments,without the cap dolomite,unconformably overlaid the Cryogenian sediments in the studied *** Member II of the DST,characterized by 50-160 m of red-green sandstone(approximately equivalent to the original Chengkou“Guanyinya Formation”),directly overlaid the Cryogenian sediments and displayed a 623±2.3 Ma maximum depositional age from the detrital zircon U-Pb *** stratigraphic correlations indicate that the C-E transition strata in northeastern Sichuan had a consistent lithological association and sedimentary sequence characteristics but differed from the Three ***,the upper Nantuo massive glacial diamictites transition to the icebergs rafted lonestone-bearing mudstones at the top,then change upward to DST barrier coast *** proposed DST of the northeastern Sichuan Basin was divided into three lithostratigraphic members without the regional Member I cap dolomite:(i)Member II purple-red,gray-green sandstone strata,(ii)MemberⅢblack mudstone strata,and(iii)Member IV P-Mn bearing *** the C-E transition,the study area experienced(i)the global deglaciation stage in the terminal Marinoan glaciation and(ii)the filling-leveling up stage with clastic rocks in the early ***,the early Ediacaran

关键词： Marinoan glaciation Doushantuo formation Cap dolomite Deglacial and coastal deposits Detrital zircon U-Pb dating

An improved ASM-heMT model for kink effect on GaN devices

在线全文

学校读者我要写书评

暂无评论

红外与毫米波学报 2024年第4期43卷 520-525页

作者： WANG Shuai CheNG Ai-qiang GE Chen CheN Dun-Jun LIU Jun DING Da-zhi Department of Electronic Science and Engineering Nanjing UniversityNanjing 210033China Nanjing Electronic Devices Institute Nanjing 210016China Department of Electronic Information Hangzhou Dianzi UniversityHangzhou 310018China Department of microelectronics Nanjing University of Science and TechnologyNanjing 210094China

With the analysis of experiment and theory on GaN heMT devices under DC sweep,an improved model for kink effect based on advanced SPICE model for high electron mobility transistors(ASM-heMT)is pro⁃posed,considering the relationship between the drain/gate-source voltage and kink *** improved model can not only accurately describe the trend of the drain-source current with the current collapse and kink effect,but also precisely fit different values of drain-source voltages at which the kink effect occurs under different gatesource ***,it well characterizes the DC characteristics of GaN devices in the full operating range,with the fitting error less than 3%.To further verify the accuracy and convergence of the improved model,a load-pull system is built in *** simulated result shows that although both the original ASM-heMT and the improved model predict the output power for the maximum power matching of GaN devices well,the im⁃proved model predicts the power-added efficiency for the maximum efficiency matching more accurately,with 4%improved.

关键词： ASM-heMT DC current collapse kink effect

Shear mechanical properties and frictional sliding responses of rough joint surfaces under dynamic normal displacement conditions

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2024年第7期31卷 2393-2410页

作者： ZHU qiang YIN Qian TAO zhi-gang he Man-chao ZheNG Bo-wen JING Hong-wen REN Shu-lin ZHANG qiang MENG Bo BAI Dong-feng WU Sai-sai WU Jiang-yu State Key Laboratory of Intelligent Construction and healthy Operation and Maintenance of Deep Underground Engineering Xuzhou 221116China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China CCCC First Highway Survey and Design Research Institute Co. Ltd.Xi’an 710075China

A comprehensive understanding of the dynamic frictional characteristics in rock joints under high normal load and strong confinement is essential for ensuring the safety of deep engineering construction and mitigating geological *** study conducted shear experiments on rough rock joints under displacement-controlled dynamic normal loads,investigating the shear behaviors of joints across varying initial normal loads,normal loading frequencies,and normal loading *** results showed that the peak/valley shear force values increased with initial normal loads and normal loading frequencies but showed an initial increase followed by a decrease with normal loading *** normal loading can either increase or decrease shear strength,while this study demonstrates that higher frequencies lead to enhanced *** initial normal loading and normal loading frequency result in a gradual decrease in joint roughness coefficient(JRC)values of joint surfaces after *** correlations existed between frictional energy dissipation and peak shear forces,while post-shear joint surface roughness exhibited a negative correlation with peak shear forces through linear regression *** study contributes to a better understanding of the sliding responses and shear mechanical characteristics of rock joints under dynamic disturbances.

关键词： dynamic normal displacement shear strength variations phase lag phenomenon stick-slip