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Searching for^(76)Ge neutrinoless double beta decay with the CDEX-1B experiment

Chinese Physics C 2024年第10期48卷 11-22页

作者： Bing-Tao Zhang jun-Zheng Wang Li-Tao Yang Qian yue Ke-jun Kang yuan-Jing Li hai-Peng An C.Greeshma Jian-Ping Chang yun-Huan Chen Jian-Ping Cheng Wen-Han Dai Zhi Deng Chang-Hao Fang Xin-Ping Geng Hui Gong Qiu-Ju Guo Xu-yuan Guo Li He Sheng-Ming He Jin-Wei Hu Han-Xiong Huang Tu-Chen Huang hai-Tao Jia Xi Jiang S.Karmakar Hao-Bin Li Jian-Min Li Jin Li Qian-yun Li Ren-Ming-Jie Li Xue-Qian Li yu-Lan Li Yi-Fan Liang Bin Liao Fong-Kay Lin Shin-Ted Lin Jia-Xuan Liu Shu-Kui Liu Yan-Dong Liu yu Liu yuan-yuan Liu Zhong-Zhi Liu Hao Ma yu-Cai Mao Qi-yuan Nie Jin-Hua Ning Hui Pan Ning-Chun Qi Jie Ren Xi-Chao Ruan Ze She Manoj Kumar Singh Tian-Xi Sun Chang-Jian Tang Wei-You Tang Yang Tian Guang-Fu Wang Li Wang Qing Wang yu-Feng Wang yun-Xiang Wang Henry-Tsz-King Wong Shi-Yong Wu yu-Cheng Wu Hao-Yang Xing Rui Xu Yin Xu Tao Xue yu-Lu Yan Nan Yi Chun-Xu yu hai-jun yu Jian-Feng yue Ming Zeng Zhi Zeng Feng-Shou Zhang Lei Zhang Zhen-Hua Zhang Zhen-yu Zhang Kang-Kang Zhao Ming-Gang Zhao Ji-Fang Zhou Zu-Ying Zhou Jing-jun Zhou Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering Physics Tsinghua UniversityBeijing 100084 Department of Physics Tsinghua UniversityBeijing 100084 Institute of Physics Academia SinicaTaipei 11529 NUCTECH Company Beijing 100084 YaLong River Hydropower Development Company Chengdu 610051 College of Nuclear Science and Technology Beijing Normal UniversityBeijing 100875 College of Physics Sichuan UniversityChengdu 610065 School of Physics Peking UniversityBeijing 100871 Department of Nuclear Physics China Institute of Atomic EnergyBeijing 102413 Sino-French Institute of Nuclear and Technology Sun Yat-sen UniversityZhuhai 519082 School of Physics Nankai UniversityTianjin 300071 Department of Physics Banaras Hindu UniversityVaranasi 221005 Department of Physics Beijing Normal UniversityBeijing 100875

We operated a p-type point contact high purity germanium(PPCGe)detector(CDEX-1B,1.008 kg)in the China Jinping Underground Laboratory(CJPL)for 500.3 days to search for neutrinoless double beta(0νββ)decay of^(76)Ge.A total of 504.3 kg⋅day effective exposure data was *** anti-coincidence and the multi/single-site event(MSE/SSE)discrimination methods were used to suppress the background in the energy region of interest(ROI,1989–2089 keV for this work)with a factor of 23.A background level of 0.33 counts/(keV⋅kg⋅yr)was *** lower limit on the half life of^(76)Ge 0νββdecay was constrained as T_(1/2)^(0ν)>1.0×10^(23)yr(90%C.L.),corresponding to the upper limits on the effective Majorana neutrino mass:<3.2–7.5 eV.

关键词： neutrinoless double beta decay CDEX point-contact germanium detector ^(76)Ge

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Graphite-polypyrrole coated 316L stainless steel as bipolar plates for proton exchange membrane fuel cells

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International Journal of Minerals,Metallurgy and Materials 2011年第1期18卷 53-58页

作者： Li-jun Yang hai-jun yu Li-jun Jiang Lei Zhu Xu-yu Jian Zhong Wang Energy Materials and Technology Research Institute Beijing General Research Institute for Nonferrous Metals Beijing 100088 China

316L stainless steel（SS 316L） is quite attractive as bipolar plates in proton exchange membrane fuel cells（PEMFC）.In this study,graphite-polypyrrole was coated on SS 316L by the method of cyclic *** surface morphology and chemical composition of the graphite-polypyrrole composite coating were investigated by scanning electron microscopy（SEM） and X-ray photoelectron spectroscopy（XPS）.A simulated working environment of PEMFC was applied for testing the corrosion properties of graphite-polypyrrole coated SS *** current densities in the simulated PEMFC anode and cathode conditions are around 3×10-9 and 9×10-5 A·cm-2,*** addition,the interfacial contact resistance（ICR） was also *** ICR value of graphite-polypyrrole coated SS 316L is much lower than that of bare SS ***,graphite-polypyrrole coated SS 316L indicates a great potential for the application in PEMFC.

关键词： proton exchange membrane fuel cells polypyrrole graphite corrosion contact resistance stainless steel

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Editorial for rare metals,special issue on solid state batteries

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Rare Metals 2018年第6期37卷 447-448页

作者： hai-jun yu Yan yu Shu-Bin Yang College of Materials Science and Engineering Beijing University of Technology Department of Materials Science and Engineering University of Science and Technology of China School of Materials Science and Engineering Beihang University

Energy storage devices based on organic liquid electrolyte are still suffered from safety issues. Therefore, developing the solid state batteries based on solid electrolytes is an inevitable choice because of the high safety. However, the practical applications of solid state batteries have been still suffered fiom some drawbacks, including the low ionic conductivity at room temperature, narrow electrochemical window, and weak chemical/electrochemical stability of solid-state electrolytes, the dendrite on metal anodes, and poor interfacial compatibility between electrodes and electrolytes.

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Time evolution law of a two-mode squeezed light field passing through twin diffusion channels

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Chinese Physics B 2022年第2期31卷 196-200页

作者： hai-jun yu Hong-Yi Fan School of Materials and Engineering University of Science and Technology of ChinaHefei 230026China School of Electronic Engineering Huainan Normal UniversityHuainan 232038China

We explore the time evolution law of a two-mode squeezed light field(pure state)passing through twin diffusion channels,and we find that the final state is a squeezed chaotic light field(mixed state)with entanglement,which shows that even though the two channels are independent of each other,since the two modes of the initial state are entangled with each other,the final state remains ***,although the squeezing(entanglement)between the two modes is weakened after the diffusion,it is not completely *** also highlight the law of photon number *** the calculation process used in this paper,we make full use of the summation method within the ordered product of operators and the generating function formula for two-variable Hermite polynomials.

关键词： two-mode squeezed light field twin diffusion channels time evolution law entanglement

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Polymer electrolyte with composite cathode for solid-state Li–CO_2 battery

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Rare Metals 2018年第6期37卷 520-526页

作者： Muhammad Mushtaq Xian-Wei Guo Jie-Peng Bi Zhao-Xiang Wang hai-jun yu College of Materials Sciences and Engineering Beijing University of Technology Key Laboratory for Renewable Energy Chinese Academy of Sciences Beijing Key Laboratory for New Energy Materials and Devices Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences School of Physical Sciences University of Chinese Academy of Sciences

The rechargeable Li-CO2 battery has attracted much attention for energy storage because of the high energy density and efficient utilization of greenhouse gas. However, it＇s still suffered by low safety issue of liquid electrolyte. Herein, a composite cathode consisting of CNTs and polymer electrolytes was fabricated by the insitu polymerization process for the polymer electrolyte-based solid-state Li-CO2 batteries. With the good dispersion of CNTs and polymer electrolyte, the composite cathode is covered by film-like discharge products ***, the Li-CO2 battery shows high reversible capacity （- 11,000 mAh·g^-1）, excellent cycle stability （1000 mAb·g^-1 for 100 cycles） under low charge potential （〈 4.5 V）, and outstanding rate performances at room temperature, which are much better than those of liquid electrolyte-based battery. Therefore, the polymer electrolyte-based Li-CO2 battery prepared by this strategy can be a promising candidate to meet the demands of high safety and high-performance energy storage devices.

关键词： Carbon dioxide Li-CO2 batteries Polymerelectrolyte Li2CO3 Battery performances

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Theoretical research into low-voltage Na_(2)TiSiO_(5)anode for lithium-ion battery

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Rare Metals 2022年第10期41卷 3412-3420页

作者： Shu Zhao Tian-Hao Wu Di He Zi-He Zhang Bo-Ya Wang Li-Hang Wang hai-jun yu Institute of Advanced Battery Materials and Devices Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing100124China Key Laboratory of Advanced Functional Materials Beijing University of TechnologyMinistry of EducationBeijing100124China

Na_(2)TiSiO_(5)(NTSO)is a low-cost Li-ion battery anode with great application potential,such as the tetragonal NTSO(T-NTSO)with a high capacity and a low *** addition to the tetragonal structure,NTSO has two other ***,the basic understanding of the structure,ion insertion and transport mechanisms of these new materials is still ***,we present a combined experimental and computational investigation of the tetragonal and orthorhombic NTSO to reveal the intrinsic mechanism leading to the superior electrochemical performance of *** determined that the insertion site with a flexible Ti^(4+)/Ti^(3+)redox pair is critical for Li+insertion *** large number of such flexible sites in the T-NTSO results in a higher capacity and higher ionic conductivity than those of orthorhombic *** understanding of intrinsic properties will accelerate the development and utilization of titanosilicates as the next generation low-voltage anode of Li-ion battery.

关键词： Lithium-ion batteries Anode materials Titanosilicates First-principles calculations Flexible redox pair

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A novel mechanism fusion data control method for slab camber in hot rolling

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Journal of Iron and Steel Research International 2023年第5期30卷 960-970页

作者： Le-bao Song Dong Xu Peng-fei Liu Jin-hang Zhou Hui-qing Yan Jing-dong Li hai-nan He hai-jun yu Xiao-chen Wang Quan Yang National Engineering Technology Research Center of Flat Rolling Equipment University of Science and Technology BeijingBeijing 100083China Xinjiang Joinworld Co. Ltd.Urumqi 830000XinjiangChina 2250 Hot Strip Mill Hunan Lianyuan Iron and Steel Co.Ltd.Loudi 417000HunanChina

For asymmetric plate shape,control over the hot rolling process mainly depends on the subjective judgement and personal experience of the operator as there are great deviations and much instability in hot ***,the intrinsic mechanisms and sensitivity affecting characteristic parameters and variables in the asymmetric rolling process remain ***,a novel mechanism fusion data control method for slab camber in hot rolling using dimensional analysis and data-driven technique was *** approach of dimensional analysis was used to establish a mathematical model and analyse the main parameters affecting the slab camber of the rough ***,the established mathematical model combined with the data-driven techniques was employed to accurately predict the slab bending ***,the superiority and effectiveness of the proposed model were demonstrated by a comparison with three regression ***,the proposed control strategy was successfully applied in a 1580 mm hot rolling industrial *** automatic control results show that the hit rate of slab cambers in different sizes from 10 to 30 mm is improved,and the quality stability of intermediate slab is significantly improved.

关键词： Mechanism model Dimensional analysis Data-driven technique Camber control Hot rolling

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Supermassive black holes triggered by QCD axion bubbles

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Communications in Theoretical Physics 2024年第5期76卷 134-139页

作者： hai-jun Li Ying-Quan Peng Wei Chao yu-Feng Zhou Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China Center for Advanced Quantum Studies Department of PhysicsBeijing Normal UniversityBeijing 100875China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China International Centre for Theoretical Physics Asia-Pacific Beijing/HangzhouChina

Supermassive black holes(SMBHs)are ubiquitous in the center of galaxies,although the origin of their massive seeds is still *** this paper,we investigate the formation of SMBHs from the quantum chromodynamics(QCD)axion *** this case,primordial black holes(PBHs)are considered as the seeds of SMBHs,which are generated from the QCD axion bubbles due to an explicit Peccei–Quinn(PQ)symmetry breaking after *** QCD axion bubbles are formed when the QCD axion starts to oscillate during the QCD phase *** consider a general case in which the axion bubbles are formed with the bubble effective angle θ_(eff)∈(0,π],leading to the minimum PBH mass∼■(10^(4)−10^(7))M⊙for the axion decay constant f_(a)∼■(10^(16))*** PBHs at this mass region may account for the seeds of SMBHs.

关键词： supermassive black holes primordial black holes quantum chromodynamics axion

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Experimental Study on the Sinking and Leveling of A Large-Capacity Offshore Wind Turbine Five-Bucket Foundation in Sand

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China Ocean Engineering 2024年第4期38卷 586-601页

作者： LIAN Ji-jian ZHU Hang GUO Yao-hua WANG hai-jun yu Tong-shun State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Tianjin University of Technology Tianjin 300384China College of Engineering Ocean University of ChinaQingdao 266100China

As offshore wind farms expand into deeper and farther ocean regions and the unit capacity of offshore wind turbines(OWTs)increases,there is a pressing need for a new foundation structure that can accommodate deep-sea conditions and support large capacities while maintaining economical and *** meet this goal of integrated transportation and one-step installation,a novel five-bucket jacket foundation(FBJF),with its suction installation and leveling methods in sand,has been proposed,analyzed and experimentally ***,seepage failure experiments of the FBJF at various depths were conducted,and a formula for calculating the critical suction of seepage failure suitable for the FBJF in sand was chosen and recommended for use with a range of values for the permeability coefficient ***,through leveling experiments of the FBJF at different depths,the maximum adjustable leveling angle during the sinking process was defined using seepage failure and the adjustable leveling angle of the foundation as control *** leveling control strategies were proposed and ***,an automatic sinking and leveling control system for the FBJF was developed and experimentally verified for feasibility.

关键词： offshore wind turbine(OWT) bucket foundation seepage failure suction installation

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Geology and mineralization of the Pulang supergiant porphyry copper deposit(5.11 Mt)in Shangri-la,yunnan Province,China:A review

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China Geology 2022年第4期5卷 662-695页

作者： Wen-chang Li Xiang-fei Zhang hai-jun yu Dong Tao Xue-long Liu College of Land and Resources Engineering Kunming University of Science and TechnologyKunming 650093China Chengdu Center China Geological SurveyMinistry of Natural ResourcesChengdu 610081China yunnan Geological Survey China Geological SurveyMinistry of Natural ResourcesKunming 650051China

The porphyry copper belt in the Geza island arc in southwestern China is the only Indosinian porphyry copper metallogenic belt that has been discovered and evaluated so *** Pulang porphyry copper deposit(also referred to as the Pulang deposit)in this area has proven copper reserves of 5.11×106 *** deposit has been exploited on a large scale using advanced mining methods,exhibiting substantial economic *** on many research results of previous researchers and the authors’team,this study proposed the following key insights.(1)The Geza island arc was once regarded as an immature island arc with only andesites and quartz diorite porphyrites *** understanding was overturned in this *** endmember components such as quartz monzonite porphyries and quartz monzonite porphyries have been identified in the Geza island arc,and the mineralization is mainly related to the magmatism of quartz monzonite porphyries.(2)Complete porphyry orebodies and large vein orebodies have developed in the Pulang *** orebody KT1 occurs in the transition area between the potassium silicate alteration zone of quartz monzonite porphyries and the sericite-quartz alteration *** of them have developed in the potassium silicate alteration *** main orebody occurs as large lenses at the top of the hanging wall of rock bodies,with an engineering-controlled length of 1920 m and thickness of 32.5‒630.29 m(average:187.07 m).It has a copper grade of 0.21%-1.56%(average:0.42%)and proven copper resources of 5.11×10^(6) t,which are associated with 113 t of gold,1459 t of silver,and 170×10^(3) t of molybdenum.(3)Many studies on diagenetic and metallogenic chronology,isotopes,and fluid inclusions have been carried out for the Pulang deposit,including K-Ar/Ar-Ar dating of monominerals(e.g.,potassium feldspars,biotites,and amphiboles),zircon U-Pb dating,and molybdenite Re-Os *** results show that the porphyries in the Pulang deposit are composite plutons a

关键词： Quartz monzonite porphyry Porphyry orebody Porphyry copper deposit Gold ore Compound mineralization Crust-mantle mixing source Indosinian Mineral exploration engineering Geza island arc Pulang yunnan Province China

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