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Event vertex and time reconstruction in large-volume liquid scintillator detectors

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Nuclear Science and Techniques 2021年第5期32卷 51-62页

作者： zi-Yuan Li Yu-Mei Zhang Guo-Fu Cao zi-Yan Deng Gui-Hong Huang Wei-Dong Li Tao Lin Liang-Jian Wen Miao Yu Jia-Heng Zou wu-Ming Luo Zheng-Yun you School of Physics Sun Yat-Sen UniversityGuangzhou 510275China Sino-French Institute of Nuclear Engineering and Technology Sun Yat-Sen UniversityZhuhai 519082China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physics and Technology Wuhan UniversityWuhan 430072China

Large-volume liquid scintillator detectors with ultra-low background levels have been widely used to study neutrino physics and search for dark *** vertex and event time are not only useful for event selection but also essential for the reconstruction of event *** this study,four event vertex and event time reconstruction algorithms using charge and time information collected by photomultiplier tubes were analyzed *** effects of photomultiplier tube properties were also *** results indicate that the transit time spread is the main effect degrading the vertex reconstruction,while the effect of dark noise is *** addition,when the event is close to the detector boundary,the charge information provides better performance for vertex reconstruction than the time information.

关键词： JUNO Liquid scintillator detector Neutrino experiment Vertex reconstruction Time reconstruction

Wave Mechanics or Wave Statistical Mechanics

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Communications in Theoretical Physics 2007年第2X期48卷 243-244页

作者： QIAN Shang-wu XU Lai-zi Physics Department Peking University Beijing 100871 China Institute of Technical Application of Rare Earth Baotou 014000 China

By comparison between equations of motion of geometrical optics and that of classical statistical mechanics, this paper finds that there should be an analogy between geometrical optics and classical statistical mechanics instead of geometrical mechanics and classical mechanics. Furthermore, by comparison between the classical limit of quantum mechanics and classical statistical mechanics, it finds that classical limit of quantum mechanics is classical statistical mechanics not classical mechanics, hence it demonstrates that quantum mechanics is a natural generalization of classical statistical mechanics instead of classical mechanics. Thence quantum mechanics in its true appearance is a wave statistical mechanics instead of a wave mechanics.

关键词： geometrical optics classical statistical mechanics quantum mechanics classical limit

Rare earth elemental and Sr isotopic evidence for seawater intrusion event of the Songliao Basin 91 million years ago

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Petroleum Science 2023年第3期20卷 1347-1362页

作者： Yu-Ke Liu Hua-jian Wang Jin-you Zhang Zhen-wu Liu Fa-zi Chen Xiao-Mei Wang Shui-Chang Zhang He Liu Research Institute of Petroleum Exploration and Development Beijing100083China Key Laboratory of Petroleum Geochemistry China National Petroleum CorporationBeijing100083China Daqing Oil Field Company China National Petroleum CorporationDaqingHeilongjiang163000China School of Ocean Sciences China University of GeosciencesBejing100083China

Petrogenesis of lacustrine dolostone is closely related with paleo-lake water *** we report the high spatial-resolution petrographic and geochemical results of a lacustrine dolomite nodule from the Qingshankou Formation,the Songliao *** and elemental signatures confirm the protogenetic origin of this nodule and its effectiveness in recording geochemical characteristics of paleo-lake water during *** low Y/Ho ratios,middle rare earth element(MREE)enrichment and subtle positive Eu anomalies within the nodule indicate a fresh water ***,the Sr isotope values in the core of the nodule(0.7076-0.7080)are close to contemporaneous seawater(0.7074),yet different from the modern river(0.7120)and the host black shale(0.7100).On the premise of excluding the influence of hydrothermal fluids,the significantly low strontium isotope values of the lacustrine dolomite might be caused by seawater interference during *** findings demonstrate that lacustrine dolomite within black shales is not only a faithful tracer of diagenetic water environment,but also a novel and easily identified mineralogical evidence for episodic seawater intrusion event(91 Ma)in the Songliao Basin,which supplements other paleontological and geochemical evidence.

关键词： Songliao Basin Lacustrine dolostone Seawater intrusion Rare earth elements Strontium isotope

The dynamic change of pore structure for low-rank coal under refined upgrading pretreatment temperatures

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Petroleum Science 2021年第2期18卷 430-443页

作者： Teng Li Cai-Fang wu zi-Wei Wang College of Petroleum Engineering Xi’an Shiyou UniversityXi’an710065ShaanxiChina Shandong Key Laboratory of Depositional Mineralization and Sedimentary Mineral Shandong University of Science and TechnologyQingdao266590ShandongChina Shaanxi Key Laboratory of Advanced Stimulation Technology for Oil and Gas Reservoirs Xi’an Shiyou UniversityXi’an710065ShaanxiChina School of Resources and Geosciences China University of Mining and TechnologyXuzhou221008JiangsuChina

Pore structure characteristics are significant factor in the evaluation of the physical characteristics of low-rank *** this study,three low-rank coal samples were collected from the Xishanyao Formation,Santanghu Basin,and low-temperature liquid-nitrogen adsorption(LP-N2A)measurements were taken under various pretreatment *** to the continuous loss of water and volatile matter in low-rank coal,the total pore volume assumes a three-step profile with knee temperatures of 150°C and 240°***,the ash in the coal can protect the coal *** collapse mainly occurs for mesopores with aperture smaller than 20 *** with apertures smaller than 5 nm exhibit a continuous decrease in pore volume,whereas the pore volume of mesopores with apertures ranging from 5 to 10 nm increases at lower pretreatment temperatures(<150°C)followed by a faint *** for mesopores with apertures larger than 10 nm,the pore volume increases significantly when the pretreatment temperature reaches 300°*** pore structure of low-rank coal features a significant heating effect,the pretreatment temperature should not exceed 150°C when the LP-N2A is used to evaluate the pore structure of low-rank coal to effectively evaluate the reservoir characteristics of low-rank coal.

关键词： Low-rank coal Low-temperature liquid-nitrogen adsorption Pore structure Refined upgrading temperatures Heating effect

天山中段城市化水平与生态环境质量时空耦合研究

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生态与农村环境学报 2025年第2期41卷 172-182页

作者：马小淞闫庆武移明昊李珂颀李桂娥吴子豪江苏国土资源智库中国矿业大学研究基地江苏徐州221116 中国矿业大学环境与测绘学院江苏徐州221116 中国矿业大学公共管理学院江苏徐州221116

为深入探究天山中段城市化水平与生态环境质量的时空耦合关系,从人口城市化、经济城市化、空间城市化以及交通城市化4个维度构建综合指标代表城市化水平,从绿度(NDVI)、湿度(WET)、热度(LST)、干度(NDBSI)和盐度(SI-T)5个方面构建遥感... 详细信息

为深入探究天山中段城市化水平与生态环境质量的时空耦合关系,从人口城市化、经济城市化、空间城市化以及交通城市化4个维度构建综合指标代表城市化水平,从绿度(NDVI)、湿度(WET)、热度(LST)、干度(NDBSI)和盐度(SI-T)5个方面构建遥感生态指数代表生态环境质量,借助耦合协调度模型探究两者的时空耦合关系,并分析2014—2022年城市化水平与生态环境质量耦合协调系统和2个子系统间不同模式的变化。结果表明:(1)天山中段整体综合城市化水平较低,发展速度较快,高城市化区域主要位于天山北坡城市群。(2)生态环境质量整体相对较差,历年质量等级在“中”及以上地区仅约占30%,研究区中部地区及西北地区生态环境较好,绝大部分地区呈现出稳定或者缓慢提升的趋势。(3)天山中段耦合协调度整体较低,呈缓慢上升趋势,平均水平均处于严重失调状态;研究期间有7.96%的区域耦合协调等级提升,其中城市化发展牺牲了生态环境的区域占比为43.33%,城市发展受到生态环境制约的区域占比为1.75%;0.86%的区域耦合协调等级降低,其中严重的制约关系致使系统整体发展失调的区域占比为43.34%,城市化水平与生态环境质量均有较大幅度降低的区域占比为56.58%。

关键词：城市化生态环境质量耦合协调度时空变化天山中段

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明清潮州“南洋”地名考

韩山师范学院学报 2025年第1期46卷 61-70页

作者：林资龙吴宏岐暨南大学历史地理研究中心广东广州510632

明清潮州“南洋”地名可以追溯至两宋时期,不过,在当时称作“南阳”。潮州南洋地名指“南部的大片平坦水田”,于明初出现,至明中期已得到广泛应用。与此同时,“南阳”地名仍为时人所用。“南阳”与“南洋”二称并存。明中后期至清初,“... 详细信息

明清潮州“南洋”地名可以追溯至两宋时期,不过,在当时称作“南阳”。潮州南洋地名指“南部的大片平坦水田”,于明初出现,至明中期已得到广泛应用。与此同时,“南阳”地名仍为时人所用。“南阳”与“南洋”二称并存。明中后期至清初,“南洋”地名逐渐取代“南阳”地名。从“南阳”到“南洋”的转变,反映了当地百姓对土地的重视程度不断提高。民国时期,随着政区调整,潮州南洋地名消失。这一变迁导致文学史研究出现将明末清初人卢若腾诗作中的“南洋贼”归于西方殖民者的错误说法。厘清上述问题,或对潮州地方史、华侨史乃至文学史相关问题的研究有一定的助益。

关键词：明清潮州南洋地名变迁

Characteristics of shell thickness in a slab continuous casting mold

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International Journal of Minerals,Metallurgy and Materials 2009年第1期16卷 25-31页

作者： Di-feng wu Shu-sen Cheng zi-jian Cheng School of Metallurgical and Ecological Engineering University of Science and Technology Beijing Beijing 100083 China Steelmaking Plant Jiuquan Iron and Steel Co. Ltd. Jiayuguan 735100 China

The key to reduce shell breakout in the continuous casting process is to control shell thickness in the mold. A numerical simulation on the turbulent flow and heat transfer coupled with solidification in the slab mold using the volume of fluid （VOF） model and the enthalpy-porosity scheme was conducted and the emphasis was put upon the flow effect on the shell thickness profiles in longitudinal and transverse directions. The results show that the jet acts a stronger impingement on the shell of narrow face, which causes a zero-increase of shell thickness in a certain range near the impingement point. The thinnest shell on the slab cross-section locates primarily in the center of the narrow face, and secondly near the comer of the wide face. Nozzle optimization can obviously increase the shell thickness and make it more uniform.

关键词： continuous casting slab mold shell thickness nozzle optimization

Expression and role of specificity protein 1 in the sclera remodeling of experimental myopia in guinea pigs

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International Journal of Ophthalmology(English edition) 2017年第4期10卷 550-554页

作者： Bo Jiang Zhang-you wu zi-Cheng Zhu Gen-Jie Ke Yue-Chun Wen Si-Qin Sun Department of Ophthalmology Anhui Provincial HospitalAnhui Medical University

AIM：To study the expression of collagen I and transcription factor specificity protein 1（Sp1）,a transforming growth factor-β1（TGF-β1） downstream target,and reveal the impact of the TGF-β1-Sp1 signaling pathway on collagen remodeling in myopic ***：Seventy-five 1-week-old guinea pigs were randomly divided into normal control,form deprivation myopia（FDM）,and self-control *** was induced for different times using coverage with translucent latex balloons and FDM recovery was performed for 1wk after 4wk treatment;then,changes in refractive power and axial length were *** and reverse transcription-polymerase chain reaction were used to evaluate dynamic changes in collagen I and Sp1 expression in the sclera of guinea pigs with emmetropia and experimental myopia,and the relationship between collagen I and Sp1 levels was ***：In the FDM group,the refractive power was gradually changed（from 2.09±0.30 D at week 0 to-1.23±0.69 D,-4.17±0.59 D,-7.07±0.56 D,and-4.30±0.58 D at weeks 2,4,6,and 1wk after 4wk,respectively;P〈0.05）,indicating deepening of *** axial length was increased（from 5.92±0.39 mm at week 0 to 6.62±0.36 mm,7.30±0.34 mm,7.99±0.32 mm,and 7.41±0.36 mm at weeks 2,4,6,and 1wk after 4wk;P〈0.05）.The m RNA and protein expression of Sp1 and collagen I in the sclera of the FDM group was lower than that of the control groups（P〈0.05）,and the reduction was eye-coverage ***,correlation between Sp1 and collagen I down-regulation in the myopic sclera was ***：Our data indicate that transcription factor Sp1 may be involved in the regulation of type I collagensynthesis/degradation during myopic sclera remodeling,suggesting that TGF-β1 signaling plays a role in the development and progression of myopia.

关键词： form-deprivation myopia sclera remodeling transforming growth factor-β1 specificity protein 1 collagen I

A rare case of primary well-differentiated angiosarcoma of the right atrium

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Journal of Geriatric Cardiology 2019年第2期16卷 164-167页

作者： Wei-zi SUN Qiu-Ji wu you WANG Min CHEN Jun ZHANG Gong ZHANG Yun-Feng ZHOU Department of Radiation and Medical Oncology Zhongnan Hospital of Wuhan UniversityWuhanChina Hubei Key Laboratory of Tumor Biological Behaviors Zhongnan Hospital of Wuhan UniversityWuhanChina Hubei Cancer Clinical Study Center Zhongnan Hospital of Wuhan UniversityWuhanChina

Primary cardiac angiosarcoma is rare in ***,it is the most common malignant tumor in the heart,accounting for 15%-35%of all cardiac *** is a very aggressive disease characterized by high rates of local recurrence and systemic metastases,and it is a poor ***,computed tomography(CT)and magnetic resonance imaging(MRI)are important tools for diagnosing cardiac angiosarcoma and are valuable in guiding surgical resection and in monitoring treatment efficacy.

关键词： Angiosarcoma Cardiac tumor Chemoradiotherapy Literature review Tumor resection