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Accelerating Oxygen Electrocatalysis Kinetics on Metal-Organic Frameworks via Bond Length Optimization

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Nano-Micro Letters 2024年第9期16卷 279-290页

作者： fan He Yingnan liu Xiaoxuan Yang Yaqi Chen Cheng‑Chieh Yang Chung‑li Dong Qinggang He bin Yang Zhongjian li Yongbo Kuang Lecheng Lei liming dai Yang Hou Key Laboratory of Biomass Chemical engineering of Ministry of Education College of Chemical and Biological EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China Institute of Zhejiang university-Quzhou Quzhou 324000People’s Republic of China Ningbo Institute of Materials technology and engineering Chinese Academy of SciencesNingbo 315201People’s Republic of China school of Biological and Chemical engineering NingboTech UniversityNingbo 315100People’s Republic of China Department of Physics Tamkang UniversityNew Taipei 25137TaiwanPeople’s Republic of China Australian Carbon Materials Centre(A‑CMC) School of Chemical EngineeringUniversity of New South WalesSydneyNSW 2051Australia

Metal-organic frameworks(MOFs)have been developed as an ideal platform for exploration of the relationship between intrinsic structure and catalytic activity,but the limited catalytic activity and stability has hampered their practical use in water ***,we develop a bond length adjustment strategy for optimizing naphthalene-based MOFs that synthesized by acid etching Co-naphthalenedicarboxylic acid-based MOFs(donated as AE-CoNDA)to serve as efficient catalyst for water ***-CoNDA exhibits a low overpotential of 260 mV to reach 10 mA cm^(−2)and a small Tafel slope of 62 mV dec^(−1)with excellent stability over 100 *** integrated AE-CoNDA onto BiVO_(4),photocurrent density of 4.3 mA cm^(−2)is achieved at 1.23 *** investigations demonstrate that the stretched Co-O bond length was found to optimize the orbitals hybridization of Co 3d and O 2p,which accounts for the fast kinetics and high *** calculations reveal that the stretched Co-O bond length strengthens the adsorption of oxygen-contained intermediates at the Co active sites for highly efficient water splitting.

关键词： Metal-organic frameworks Bond length adjustment Spin state transition Orbitals hybridization Water splitting

Short-term effects of cupping and scraping therapy for chronic nonspecific low-back pain:A prospective,multicenter randomized trial

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Journal of Integrative Medicine 2024年第1期22卷 39-45页

作者： Jun-yan He Xiao-yu Tu Zi-fei Yin Hui Mu Ming-jun Luo Xing-yu Chen Wei-bin Cai Xue zhao Can Peng fan-fu fang Can Lü Bai li school of Traditional Chinese Medicine Naval Medical UniversityShanghai 200433China Department of Rehabilitation Medicine and Physiotherapy the First Affiliated Hospital of Naval Medical UniversityShanghai 200433China Department of Rehabilitation Medicine and Training PLA 458 HospitalGuangzhou 510602Guangdong ProvinceChina No.3 Ward of Acupuncture Rehabilitation Department Guangdong Second Traditional Chinese Medicine HospitalGuangzhou 510095Guangdong ProvinceChina

Background As one of the most common musculoskeletal ailments,chronic nonspecific low-back pain(CNLBP)causes persistent disability and substantial medical *** evidence shows that the incidence rate of CNLBP in young and middle-aged people who are demanded rapidly recovery and social contribution is *** guidelines indicate a reduced role for medicines in the management of *** The present study investigates the short-term effects of cupping and scraping therapy using a medicated balm,compared to nonsteroidal anti-inflammatory drug(NSAID)with a capsaicin plaster,in the treatment of ***,setting,participants and interventions We designed a prospective multicenter randomized clinical trial enrolling patients from January 1,2022 to December 31,2022.A total of 156 patients with CNLBP were randomized into two parallel *** sodium-sustained release tablets were administered orally to participants in the control group for one week while a capsaicin plaster was applied *** in the test group were treated with cupping and scraping using a medical device and medicated *** outcome measures Primary outcome was pain recorded using the visual analogue scale(VAS).Two secondary outcomes were recorded using the Japanese Orthopedic Association low-back pain scale(JOA)and the traditional Chinese medicine(TCM)syndrome integral scale(TCMS)as assessment *** Between baseline and postintervention,all changes in outcome metric scales were statistically significant(P1).Compared to the control group,patients in the test group had a significantly greater treatment effect in all outcome variables,as indicated by lower VAS and TCMS scores and higher JOA scores,after the one-week intervention period(P1).Further,according to the findings of multivariate linear regression analysis,the participants’pain(VAS score)was related to their marital status,age,smoking habits and body mass *** adverse r

关键词： Chronic nonspecific low-back pain Traditional Chinese medicine Cupping and scraping therapy

The luminescence properties of Sr_3Gd(BO_3)_3:Tb^(3+) phosphors under vacuum ultraviolet excitation

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Chinese science Bulletin 2012年第34期57卷 4513-4516页

作者： zhao wenyu GAO SongWei AN shengli fan bin li songbo school of Chemistry and Chemical engineering Inner Mongolia University of Science and TechnologyBaotou 014010China school of metallurgical and ecological engineering University of Science and Technology Beijing Beijing 100083China school of Material and metallurgical engineering lnner Mongolia University of Science and TechnologyBaotou 014010China

Tb3+-activated Sr3Gd(BO3)3 green phosphors were prepared by conventional solid-state reaction. The vacuum ultraviolet (VUV) excitation, photoluminescence (PL) and decay properties of the phosphors in the visible range were investigated. The excitation spectrum showed a strong broad band from 160 to 200 nm with a maximum at 183 nm which was adjacent to the VUV excitation light source of 172 nm. Under excitation at 172 nm, the optimum co-doping concentration of Tb3+ was 10 mol%, and the emission intensity of Sr3Gd0.9(BO3)3:0.1Tb3+ was comparable to that of commercial Zn2SiO4:Mn2+. The strongest emission peak of Sr3Gd0.9(BO3)3:0.1Tb3+ was at 543 nm with chromaticity coordinates of (0.2626, 0.4922) and a lifetime of 2.32 ms. The optical properties of the green phosphor Sr3Gd(BO3)3:Tb3+ make it suitable for use in Hg-free fluorescent lamps and plasma display panels.

关键词：真空紫外线绿色荧光粉激发光源发光性能绿色荧光体发射强度无汞荧光灯固相反应

Experiment of X-ray Generations Using Laser-Compton Scattering at liNAC of SINAP

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原子核物理评论 2009年第S1期26卷 109-114页

作者： PAN Qiang-yan1,XU Wang1,LUO Wen1,3,fan Gong-tao1,3,Yang li-feng1,3,fan Guang-wei1,3,li Yong-jiang1,3,XU Ben-ji1,SHI Xiang-chun2,liN Guo-qiang1, YAN Zhe1,XU Yi1,3,CHEN Jing-gen1,GUO Wei1,WANG Hong-wei1,WANG Cheng-bin1, XU Jia-qiang1,Ma Yu-gang1,CAI Xiang-zhou1, zhao Ming-hua1,SHEN Wen-qing1(1 Shanghai Institute of Applied Physics,Chinese Academy of sciences,Shanghai 201800,china 2 Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of sciences,Shanghai 201800,china 3 Graduate school of Chinese Academy of sciences,beijing 100049,china) Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Shanghai Institute of Applied Physics Chinese Academy of SciencesShanghai 201800China Graduate school of Chinese Academy of sciences Beijing 100049China

Laser Compton scattering(LCS) can generate X-rays or γ-rays with high brightness and easy controlled polarization by applying high-peak-power laser pulses to relativistic electron bunches. One of the most promising approaches to short pulsed X-ray sources is the laser synchrotron source. It is based on LCS between picoseconds relativistic electron bunches and picoseconds laser pulses. A project of Shanghai laser electron gamma source with LCS method has been proposed on Shanghai synchrotron radiation facility. Before that,a prototype has been developed in the beamline of the linear accelerator at the Shanghai Institute of Applied Physics,Chinese Academy of sciences. The LCS experiment was carried out by using the 107 MeV,5 Hz,1 ns,0.1 nC electron bunches from the linear accelerator and the 18 ns,10 MW peak power,Nd∶YAG laser pulses. In this communication,we describe the details and report the first results of this experiment.

关键词： Compton scattering Nd∶YAG laser γ-ray source polarization

In situ forming injectable MSC-loaded GelMA hydrogels combined with PD for vascularized sweat gland regeneration

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Military Medical Research 2024年第1期11卷 152-155页

作者： Enhe Jirigala bin Yao zhao li Yi-Jie Zhang Chao Zhang li-Ting liang fan-liang Zhang Xing-Yu Yuan Xian-Lan Duan Wei Song Meng-De Zhang Yi Kong Xiao-bing Fu Sha Huang Research Center for Tissue Repair and Regeneration Medical Innovation Research DepartmentChinese PLA General Hospital and PLA Medical CollegeBeijing 100048China Institute of Basic Medical Research Inner Mongolia Medical UniversityHohhot 010110China Academy of Medical engineering and Translational Medicine Tianjin UniversityTianjin 300072China school of Medicine Nankai UniversityTianjin 300071China

Dear Editor,Three dimensional(3D)bioprinted extracellular matrix(ECM)can be used to provide both biochemical and biophysical cues to direct mesenchymal stem cells(MSCs)differentiation,and then differentiated cells were isolated for implantation in vivo using surgical ***,the reduced cell activity after cell isolation from 3D constructs and low cell retention in injured sites limit its application[1].Methacrylated gelatin(GelMA)hydrogel has the advantage of fast crosslinking,which could resemble complex architectures of tissue construct in vivo[2].Here,we adopted a noninvasive bioprinting procedure to imitate the regenerative microenvironment that could simultaneously direct the sweat gland(SG)and vascular differentiation from MSCs and ultimately promote the replacement of glandular tissue in situ(Fig.1a).

关键词： Sweat gland GelMA In situ niche Cell differentiation Tissue incorporation Vascularization

RAPN与LPN治疗孤立肾肾肿瘤的效果比较

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中华泌尿外科杂志 2024年第1期45卷 6-11页

作者：江彬卢崯赵旭鹏程强艾青高帆李宏召解放军总医院第三医学中心泌尿外科医学部北京100853 南开大学医学院天津300071

目的比较机器人辅助腹腔镜肾部分切除术(RAPN)与腹腔镜肾部分切除术(LPN)治疗孤立肾肾肿瘤的效果,并分析患者术后肾功能和远期生存的影响因素。方法回顾性分析2010年11月至2022年1月在解放军总医院行手术治疗的67例孤立肾肾肿瘤患者的... 详细信息

目的比较机器人辅助腹腔镜肾部分切除术(RAPN)与腹腔镜肾部分切除术(LPN)治疗孤立肾肾肿瘤的效果,并分析患者术后肾功能和远期生存的影响因素。方法回顾性分析2010年11月至2022年1月在解放军总医院行手术治疗的67例孤立肾肾肿瘤患者的临床资料。男48例,女19例;年龄(58.6±10.1)岁。按照手术方式不同分为RAPN组(43例)和LPN组(24例)。RAPN组较LPN组的R.E.N.A.L.评分更高[(8.7±1.5)分与(7.9±1.7)分,P=0.042],两组年龄[(57.4±10.2)岁与(60.9±9.8)岁,P=0.185]、体质量指数(BMI)[(25.7±3.5)kg/m^(2)与(25.1±3.6)kg/m^(2),P=0.518]及术前血肌酐[(102.9±31.6)μmol/L与(102.3±22.4)μmol/L,P=0.930]差异均无统计学意义。12例术中采用低温处理,其中RAPN组9例(20.9%),LPN组3例(12.5%,P=0.596)。比较两组手术时间、术中热缺血时间、术中失血量、术后禁食时间、围手术期并发症发生率、术后血肌酐等指标。用多因素线性回归分析术后血肌酐的影响因素。用Kaplan-Meier曲线分析患者预后生存情况,并采用log-rank检验比较组间差异;采用多因素Cox回归分析患者预后的影响因素。结果所有手术均顺利完成,病理切缘均为阴性,RAPN组与LPN组手术时间[(136.6±47.6)min与(125.3±34.4)min,P=0.311]、术中热缺血时间[23.0(16.0,30.0)min与19.0(13.5,27.5)min,P=0.260]、术中失血量[50.0(50.0,100.0)ml与50.0(22.5,100.0)ml,P=0.247]、术后住院时间[(6.6±3.5)d与(7.7±4.2)d,P=0.244]、术后引流管拔除时间[4(3,5)d与5(3,6)d,P=0.175]、术后禁食时间[(2.1±0.7)d与(2.2±1.0)d,P=0.729]、围手术期并发症发生率[18.6%(8/43)与16.7%(4/24),P=1.000]、术后血肌酐[145.2(128.3,191.3)μmol/L与157.8(136.2,196.3)μmol/L,P=0.229]及病理分期[T_(1a)/T_(1b)/T_(2a)/T_(3a)/T_(4)期32/7/1/3/0例与17/5/0/1/1例,P=0.804]差异均无统计学意义。Kaplan-Meier生存曲线显示RAPN组术后1、3、5年的总生存率分别为94.7%、84.9%、84.9%,LPN组分别为100.0%、95.5%、95.5%,log-rank检验结果显示两组总生存率差异无统计学意义(P=0.116)。除去术前已发生肿瘤转移的10例患者(RAPN组7例,LPN组3例),RAPN组术后1、3、5年的无进展生存率分别为84.8%、81.1%、81.1%,LPN组分别为100.0%、95.0%、90.0%,log-rank检验结果示两组无进展生存率差异无统计学意义(P=0.142)。多因素线性回归分析结果显示,术中采用低温处理能够显著降低术后血肌酐(B=-72.191,P=0.048)。多因素Cox回归分析结果显示,BMI(HR=0.743,P=0.044)、病理T分期(HR=4.235,P=0.018)、术前存在转移(HR=18.829,P=0.035)是患者总生存时间的独立影响因素,BMI越小、病理分期越高、术前存在转移患者预后越差。结论尽管RAPN组肿瘤R.E.N.A.L.评分更高,手术难度更大,但可达到与LPN组相似的围手术期结果和预后,RAPN治疗孤立肾肾肿瘤更有优势。适当的术中低温处理可更好地保护术后肾功能。BMI、病理T分期、术前转移是总生存时间的独立影响因素,BMI越小、病理分期越高及术前存在转移患者预后越差。

关键词：肾肿瘤孤立肾肾部分切除术机器人手术腹腔镜手术疗效影响因素

Status of aquatic organisms resources and their environments in Yangtze River system(2017-2021)⋆

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Aquaculture and Fisheries 2024年第5期9卷 833-850页

作者： Haile Yang li Shen Yongfeng He Huiwu Tian Lei Gao Jinming Wu Zhigang Mei Nian Wei lin Wang Tingbing Zhu Feifei Hu Jinling Gong Hongchun Du Xinbin Duan Huatang Deng Daoqun Wang Fengyue Zhu Yunfeng li fan Wu Huijun Ru Yan Zhang Junyi li Junlin Yang Yuntao Zhou Dongdong fang Yinping Wang Danqing lin Yanping Yang Peijie li Silei liu Jian Yang Ping Zhuang Sikai Wang Tao Zhang Gang Yang Wenbo Yang lilai Yuan Kun Cao Shuo Xu Huiyuan liu Zhiqiang liang Chongrui Wang Hong li Xiping Yuan Xin Yang Yilong Fu Yanping Zhang Haixin Zhang Zhiying Tao Sheng Wang Xiaoping Gao binsong Jin Kemao li Guojie Wang Shenglong Jian Yingqin li Chenjiang Xue Chunyun Lei Shaowei Xue Yi Sun bin Zhu Ke Shao Xingkun Hu Meihua Xiong Jun Du bin He Tao Yan Yingying Huang Yuanchao Zou Biwen Xie Yongming Wang bin li Fei liu Yaoyao Zhang Fei fan Zhijian Wang Jing Huang Haoran Gu Hailong Ge Yan Dan Yan li Shuqiao Wang Chuang Zhang Lu Zhou Xue Wang Sheng Zeng Yan Xiang Xugang He Jianhui Qin Chengxing Xia Jie Hou Yifu Shi lifang Gao Zhiqiang Zhu Hongbao Shen Yun Du Xuejun Duan Jiawu Xiong Deguo Yang Shaoping liu zhaohui Ni Hui Zhang Kai liu Feng zhao Yingren li Jianwei Wang Qiwei Wei Yangtze River Fisheries Research Institute Chinese Academy of Fishery SciencesWuhan430223China Institute of Hydrobiology Chinese Academy of SciencesWuhan430072China Fishery Resource and Environment Research Center Chinese Academy of Fishery SciencesBeijing100141China Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization Ministry of Agriculture and Rural AffairsFreshwater Fisheries Research CenterChinese Academy of Fishery SciencesWuxi214081China East china Sea Fisheries Research Institute Chinese Academy of Fishery SciencesShanghai200090China Institute of Fisheries engineering Chinese Academy of Fishery SciencesBeijing100141China Hunan Fisheries science Institute Changsha410153China Jiangxi Fisheries Research Institute Nanchang330039China Jiujiang Academy of Fishery sciences Jiujiang332000China school of life sciences Nanchang UniversityNanchang330031China Qinghai Provincial Fishery technology Extension Center Xining810012China Yunnan Academy of Fishery sciences Kunming650111China Institute of Hydroecology Ministry of Water Resources and Chinese Academy of SciencesWuhan430079China Fisheries Institute Sichuan Academy of Agricultural SciencesChengdu611731China school of life sciences Neijiang Normal UniversityNeijiang641100China school of life sciences Southwest UniversityChongqing400715China Chongqing Fishery sciences Research Institute Chongqing401120China Guizhou Fisheries Research Institute Guiyang550025China College of Fisheries Huazhong Agricultural UniversityWuhan430072China Hubei Fisheries science Research Institute Wuhan430070China Shaanxi Fisheries Research Institute Xi’an710086China Innovation Academy for Precision Measurement science and technology Chinese Academy of SciencesWuhan430077China Nanjing Institute of Geography and limnology Chinese Academy of SciencesNanjing210008China Central South Inventory and Planning Institute of State Forestry and Grassland Administration Changsha410014China

The Yangtze River is the mother river of *** promote the aquatic ecosystem protection of the great river,the Project of Yangtze Fisheries Resources and Environment Investigation(2017-2021)supported by the Ministry of Agriculture and Rural Affairs,*** carried out by 24 institutes and universities that located in the Yangtze River basin surveys the status of(1)fish species composition and spatial distribution,(2)current fish abundance,(3)endangered fishes,(4)Yangtze finless porpoise,(5)aquatic eco-environments,(6)water-level fluctuation areas,(7)capture fisheries and recreational fisheries of the Yangtze River mainstream and 10 of its main tributaries,including Yalong River,Heng River,Min River(including Dadu River),Chishui River,Tuo River,Jialing River,Wu River,Han River,Dongting Lake and Poyang *** results showed that there were 443 fish species(belonging to 163 genus,37 families,and 18 orders)before 2017,but only 323 fish species(including 15 new recorded exotic species)were recorded in the project of *** them,Cyprinus carpio,Carassius auratus,Hypophthalmichthys molitrix,Pelteobagrus fulvidraco,Coilia brachygnathus,Silurus asotus,Saurogobio dabryi,Ctenopharyngodon idellus,Pelteobagrus nitidus,Hemiculter leucisculus,Siniperca chuatsi,Coreius heterodon,Culter alburnus,Parabramis pekinensis,and Aristichthys nobilis were the dominant species across the whole Yangtze River *** is estimated that there were 886 million individuals weighing 124.8 million kg,merely equivalent to 27.3%of the resources in 1950s,30.9%of the resources in 1960s,or 58.7%of the resources in *** the new list of protected fishes that recorded in the Yangtze River system,only 15 of 29 were collected in this project of *** gladius has been affirmed to be Extinct by International Union for Conservation of Nature(IUCN).The wild individuals of Tenualosa reevesii and Luciobrama macrocephalus have disappeared for many years and maybe have been extinct

关键词： Fishes Yangtze finless porpoise Resources Aquatic ecosystem Fisheries Background investigation Yangtze river system

西昆仑奇台达坂北中新世石英二长岩侵入岩年代学、地球化学及其构造意义

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西北地质 2024年第4期57卷 191-205页

作者：代新宇周斌李新林杜彪范鹏赵江林杨文博武忠山陕西省地质调查院陕西西安710054 陕西省地质调查规划研究中心陕西西安710068

奇台达坂位于新疆西昆仑新藏公路540 km处,在其北侧分布有小规模的中酸性侵入岩,呈NE向展布,岩性主要为石英二长岩。笔者以西昆仑地区东段奇台达坂北石英二长岩侵入体为研究对象,进行岩石地球化学、锆石LA-ICP-MS U-Pb年代学分析。结果... 详细信息

奇台达坂位于新疆西昆仑新藏公路540 km处,在其北侧分布有小规模的中酸性侵入岩,呈NE向展布,岩性主要为石英二长岩。笔者以西昆仑地区东段奇台达坂北石英二长岩侵入体为研究对象,进行岩石地球化学、锆石LA-ICP-MS U-Pb年代学分析。结果表明,石英二长岩锆石U-Pb年龄加权平均值为(10.4±0.2)Ma,形成时代为中新世;岩石具有高SiO_(2)(63.16%~68.20%)、贫Al2O3(13.39%~15.47%)、高K_(2)O(4.23%~5.24%)、低MgO(1.06%~1.49%)、低TiO_(2)(0.60%~0.83%)、准铝质(A/CNK=0.83~0.90)的地球化学性质,具有A型花岗岩特征;富集K、Rb、Th、U而亏损Ba、Sr等大离子亲石元素,相对亏损Nb、Ta、Ti等高场强元素,δEu具明显的负异常特征。岩石的地球化学特征和构造环境判别图解均指示,石英二长岩可能形成于深部岩石圈强烈伸展的环境下,地壳深部形成高温低压环境,促使下地壳发生低程度部分熔融并沿深大断裂快速上升侵位,代表了板内伸展背景作用下的岩浆响应。

关键词：奇台达坂北锆石U-Pb年代学地球化学板内伸展

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

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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:2–7.5 eV.

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