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High‑accuracy measurement of Compton scattering in germanium for dark matter searches

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Nuclear Science and Techniques 2022年第12期33卷 75-87页

作者： Hai‑Tao Jia Shin‑Ted Lin Shu‑Kui Liu Hsin‑chang Chi Muhammed Deniz chang‑Hao Fang Peng Gu Xi jiang Yi‑Ke Shu Qian‑Yun Li Yu Liu Ren‑Ming‑Jie Li Chen‑Kai Qiao chang‑jian tang Henry Tsz‑King Wong Hao‑Yang Xing Li‑Tao Yang Qian Yue Yu‑Lu Yan Kang‑Kang Zhao Jing‑Jun Zhu College of Physics Sichuan University610065 ChengduChina Department of Physics National Dong Hwa University97401 ShoufengHualienChina Department of Physics Dokuz Eylül University35160 BucaİzmirTurkey Institute of Physics Academia Sinica11529 TaipeiChina Key Laboratory of Particle and Radiation Imaging(Ministry of Education)and Department of Engineering Physics Tsinghua University100084 BeijingChina Institute of Nuclear Science and Technology Sichuan University610065 ChengduChina

Compton scattering with bound electrons contributes to a significant atomic effect in low-momentum transfer,yielding background structures in direct light dark matter searches as well as low-energy rare event *** report the measurement of Compton scattering in low-momentum transfer by implementing a 10-g germanium detector bombarded by a^(137)Cs source with a radioactivity of 8.7 mCi and a scatter photon captured by a cylindrical NaI(Tl)detector.A fully relativistic impulse approximation combined with multi-configuration Dirac–Fock wavefunctions was evaluated,and the scattering function of Geant4 software was replaced by our calculation *** measurements show that the Livermore model with the modified scattering function in Geant4 is in good agreement with the experimental *** is also revealed that atomic many-body effects significantly influence Compton scattering for low-momentum transfer(sub-keV energy transfer).

关键词： Compton scattering experiment Germanium detector Atomic many-body effects Geant4 Dark matter

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含DG的配电网系统谐波分布特性研究

电力系统保护与控制 2017年第14期45卷 38-44页

作者：江友华常建唐忠上海电力学院电子与信息工程学院上海200090 国网浙江省电力公司绍兴供电公司浙江绍兴312000

为分析含DG的配电网谐波分布特性,首先基于DG与配电网耦合系统拓扑结构推导出谐波耦合导纳矩阵,其表明阻抗网络参数变化会影响谐波分布。然后给出含有DG的配电网数学模型,从理论上分析出配电网中谐波电压畸变率的变化规律的影响因素。... 详细信息

为分析含DG的配电网谐波分布特性,首先基于DG与配电网耦合系统拓扑结构推导出谐波耦合导纳矩阵,其表明阻抗网络参数变化会影响谐波分布。然后给出含有DG的配电网数学模型,从理论上分析出配电网中谐波电压畸变率的变化规律的影响因素。最后基于PSCAD搭建了分布式电源与配电网联合仿真系统,针对分布式电源(风力发电,太阳能发电)不同出力、不同位置,仿真分析分布式电源对配电网谐波分布的影响。仿真研究结果表明:DG的分布位置,不同出力直接影响配电网谐波分布。该研究结果对分布式电源的选址和定容有重要的参考价值。

关键词：谐波分布 PSCAD 配电网分布式电源

Unlocking the future:Mitochondrial genes and neural networks in predicting ovarian cancer prognosis and immunotherapy response

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World Journal of Clinical Oncology 2025年第1期16卷 43-52页

作者： Zhi-jian tang Yuan-Ming Pan Wei Li Rui-Qiong Ma jian-Liu Wang Department of Obstetrics and Gynecology Peking University People’s HospitalBeijing 100044China Cancer Research Center Beijing Chest HospitalBeijing 101149China Department of Thoracic Surgery Sichuan Provincial People's HospitalChengdu 610072Sichuan ProvinceChina

BACKGROUND Mitochondrial genes are involved in tumor metabolism in ovarian cancer(OC)and affect immune cell infiltration and treatment *** To predict prognosis and immunotherapy response in patients diagnosed with OC using mitochondrial genes and neural *** Prognosis,immunotherapy efficacy,and next-generation sequencing data of patients with OC were downloaded from The Cancer Genome Atlas and Gene Expression *** genes were sourced from the MitoCarta3.0 *** discovery cohort for model construction was created from 70% of the patients,whereas the remaining 30% constituted the validation *** the expression of mitochondrial genes as the predictor variable and based on neural network algorithm,the overall survival time and immunotherapy efficacy(complete or partial response)of patients were *** In total,375 patients with OC were included to construct the prognostic model,and 26 patients were included to construct the immune efficacy *** average area under the receiver operating characteristic curve of the prognostic model was 0.7268[95% confidence interval(CI):0.7258-0.7278]in the discovery cohort and 0.6475(95%CI:0.6466-0.6484)in the validation *** average area under the receiver operating characteristic curve of the immunotherapy efficacy model was 0.9444(95%CI:0.8333-1.0000)in the discovery cohort and 0.9167(95%CI:0.6667-1.0000)in the validation *** The application of mitochondrial genes and neural networks has the potential to predict prognosis and immunotherapy response in patients with OC,providing valuable insights into personalized treatment strategies.

关键词： Ovarian cancer Mitochondria Prognosis Immunotherapy Neural network

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:<3.2–7.5 eV.

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

Unscented Kalman-filter-based sliding mode control for an underwater gliding snake-like robot

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Science China(Information Sciences) 2020年第1期63卷 213-225页

作者： Jingge tang Bin LI jian chang Aiqun ZHANG State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences

With its strong endurance and high maneuverability, an underwater gliding snake-like robot(UGSR) is a strong potential candidate for aquatic exploration and monitoring. The major feature of the UGSR, which distinguishes it from other snake-like robots, is long range and long operation duration by gliding. This study establishes a gliding motion control system for the UGSR based on a sliding mode controller(SMC). The control system stabilizes the system and suppresses the uncertainties and unknown disturbances. In this strategy, chattering is reduced based on the reaching law method. To circumvent the difficulty of velocity measurements, a nonlinear observer based on an unscented Kalman filter(UKF) is employed for state estimation and random noise handling. The effectiveness of the proposed controller and observer is verified by simulating the UKF-based SMC closed-loop system.

关键词： underwater gliding snake-like robot sliding mode control reaching law nonlinear observer unscented Kalman filter robustness

数字经济驱动扬州先进制造业与现代服务业融合的路径研究

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江苏商论 2025年第1期 66-69页

作者：唐建扬州职业大学管理学院江苏扬州225100

在先进制造业与现代服务业融合的过程中,数字经济贯穿其中。文章阐述了数字经济对“两业”融合的作用,并在目前扬州“两业”融合基础之上,总结了扬州“两业”融合中的问题,提出了数字经济促进扬州“两业”融合的路径。

关键词：数字经济先进制造业现代服务业产业融合

Diffusion Dynamics of Cux Cluster on Cu（111） Surface

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Chinese Journal of Chemical Physics 2008年第1期21卷 27-31页

作者： jian-feng tang Mai-chang Xu Xue-song Li Wo-yun Long Department of Applied Physics Hunan Agricultural University Changsha 410128 China Department of Maths and Physics Hunan Institute of Engineering Xiangtan 411104 China

The diffusion dynamics of small two-dimensional atomic clusters Cux （1≤x≤8） on Cu（lll） surface were studied using the molecular dynamics simulations and a modified analytic embedded-atom method in the temperature range from 200 K to 800 K. The cluster size and temperature dependence of the diffusion coefficients and migration energies are presented. Our simulations show that the diffusion migration energy of the CuT cluster is the highest and the prefactor for the CuT cluster is almost three orders of magnitude larger than that for single atom diffusion. This conclusion is consistent with the experimental results for similar metals. In addition, the dependence of cluster diffusion on film growth is also discussed.

关键词： Cluster Molecular dynamics Surface diffusion

Spectrofluorimetric Determination of Trace Amounts of Gallium with Salicylaldehyde Benzoylhydrazone

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Chemical Research in Chinese Universities 1998年第3期14卷 37-41页

作者： tang Bo WU chang ju WANG Hong jian YEN jian chong Department of Chemistry Shandong Normal UniversityJinan250014

The fluorescent reagent salicylaldehyde benzoylhydrazone(SABH) was synthesized and its ionization constants were estimated spectrophotometrically. The fluorescent reaction of this reagent with gallium was studied. Based on this chelation reaction, a spectrofluorimetric method was developed for the determination of gallium in a water medium at pH 3.2. Under these conditions, the Ga SABH complex has excitation and emission maxima at 372 and 455 nm, respectively. The linear range of the method was 0～150 μg/L and the detection limit was 0.36 μg/L of gallium when a standard addition method was used in the assay. The molar ratio of gallium to the reagent was 1∶3. The interference of other ions was studied. The extraction with n butyl acetate from a 6 mol/L hydrochloric acid medium was used to separate Ga from the interfering elements in semiconductor silicon and geological samples, and themethod has been successfully applied to the determination of gallium in these samples.

关键词： Salicylaldehyde benzoylhydrazone Gallium determination Spectrofluorimetry

A Linear Approach for Depth and Colour Camera Calibration Using Hybrid Parameters

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Journal of Computer Science & Technology 2016年第3期31卷 479-488页

作者： Ke-Li Cheng Xuan Ju Ruo-Feng Tong Min tang jian chang jian-Jun Zhang College of Computer Science and Technology Zhejiang University Hangzhou 310027 China National Centre for Computer Animation Bournemouth University Poole BH12 5BB U.K.

Many recent applications of computer graphics and human computer interaction have adopted both colour cameras and depth cameras as input devices. Therefore, an effective calibration of both types of hardware taking different colour and depth inputs is required. Our approach removes the numerical difficulties of using non-linear optimization in previous methods which explicitly resolve camera intrinsics as well as the transformation between depth and colour cameras. A matrix of hybrid parameters is introduced to linearize our optimization. The hybrid parameters offer a transformation from a depth parametric space （depth camera image） to a colour parametric space （colour camera image） by combining the intrinsic parameters of depth camera and a rotation transformation from depth camera to colour camera. Both the rotation transformation and intrinsic parameters can be explicitly calculated from our hybrid parameters with the help of a standard QR factorisation. We test our algorithm with both synthesized data and real-world data where ground-truth depth information is captured by Microsoft Kinect. The experiments show that our approach can provide comparable accuracy of calibration with the state-of-the-art algorithms while taking much less computation time （1/50 of Herrera＇s method and 1/10 of Raposo＇s method） due to the advantage of using hybrid parameters.

关键词： camera calibration depth camera linear optimization camera pair Kinect