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A discussion on the anomalous threshold enhancement of J/ψ–ψ(3770)couplings and X(6900)peak

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Chinese Physics C 2024年第4期48卷 1-5页

作者：陆业陈畅秦广友郑汉青 Institute of Particle Physics and Key Laboratory of Quark and Lepton Physics(MOE) Central China Normal UniversityWuhan 430079China Department of Physics Peking UniversityBeijing 100871China College of Physics Sichuan UniversityChengdu 610065China

The attractive interaction between J/ψandψ(3770)has to be strong enough if X(6900)is of the molecule *** argue that sinceψ(3770)decays predominantly into a DD^(¯)pair,the interactions between J/ψandψ(3770)may be significantly enhanced owing to the three point DD^(¯)loop *** enhancement originates from the anomalous threshold located at t=−1.288 GeV^(2),whose effect propagates into the s-channel partial wave amplitude in the vicinity of √s≃6.94 *** effect may be helpful in the formation of the X(6900)peak.

关键词： exotic hadrons hadron molecule X(6900)

Recent Progress on Thermal Energy Storage for Coal-Fired Power Plant

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Journal of Thermal Science 2024年第6期33卷 2138-2150页

作者： WANG Wei ZHANG Jianyuan GU Yi LUO qing ZHOU Guiqing LI Ang LU Guozhong MA Tingshan ZHAO Yuanzhu chang Yiming XUE Zhaonan Xi'an thermal power research institute CO. LTD. State grid Liaoning electric power supply CO. LTD. GD power Dalian Zhuanghe power generation CO. LTD.

With countries proposing the goal of carbon neutrality,the clean transformation of energy structure has become a hot and trendy issue *** energy generation will account for the main proportion,but it also leads to the problem of unstable electricity *** present,large-scale energy storage technology is not yet *** the flexibility of coal-fired power plants to suppress the instability of renewable energy generation is a feasible *** energy storage is a feasible technology to improve the flexibility of coal-fired power *** article provides a review of the research on the flexibility transformation of coal-fired power plants based on heat storage technology,mainly including medium to low-temperature heat storage based on hot water tanks and high-temperature heat storage based on molten *** current technical difficulties are summarized,and future development prospects are *** combination of the thermal energy storage system and coal-fired power generation system is the foundation,and the control of the inclined temperature layer and the selection and development of molten salt are key *** authors hope that the research in this article can provide a reference for the flexibility transformation research of coal-fired power plants,and promote the application of heat storage foundation in specific coal-fired power plant transformation projects.

关键词： coal-fired power station flexible regulation molten salt heat storage thermal energy storage water tank heat storage

Some remarks on compositeness of T_(cc)^(+)

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Chinese Physics C 2024年第4期48卷 51-58页

作者：陈畅孟策肖志广郑汉青 Department of Physics Peking UniversityBeijing 100871China College of Physics Sichuan UniversityChengdu 610065China

Recently,the LHCb experimental group found an exotic state T_(cc)^(+) from the pp→D^(0)D^(0)π^(+)+X process.A key question is whether it is just a molecule or may have a confined tetraquark *** investigate this,different methods were used,including a two-channel(D^(∗)+D^(0) and D^(∗)0D^(+))K-matrix unitarization and a single-channel Flatté-like parametrization method analyzed utilizing the pole counting rule and spectral density function sum *** analyses demonstrated that T_(cc)^(+) is a molecular state,although the possibility that there may exist an elementary ingredient cannot be excluded,according to an approximate analysis of its production rate.

关键词： exotic mesons strong interaction hadron-hadron interactions scattering matrix bound state

The effects of various factors on spontaneous imbibition in tight oil reservoirs

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Petroleum Science 2024年第1期21卷 315-326页

作者： Cheng Liu Tian-Ru Wang qing You Yue-Chun Du Guang Zhao Cai-Li Dai School of Energy Resources China University of GeosciencesBeijing100083PR China School of Petroleum Engineering China University of PetroleumQingdao266580ShandongPR China

Slickwater fracturing fluids have gained widespread application in the development of tight oil reservoirs. After the fracturing process, the active components present in slickwater can directly induce spontaneous imbibition within the reservoir. Several variables influence the eventual recovery rate within this procedure, including slickwater composition, formation temperature, degree of reservoir fracture development, and the reservoir characteristics. Nonetheless, the underlying mechanisms governing these influences remain relatively understudied. In this investigation, using the chang-7 block of the changqing Oilfield as the study site, we employ EM-30 slickwater fracturing fluid to explore the effects of the drag-reducing agent concentration, imbibition temperature, core permeability, and core fracture development on spontaneous imbibition. An elevated drag-reducing agent concentration is observed to diminish the degree of medium and small pore utilization. Furthermore, higher temperatures and an augmented permeability enhance the fluid flow properties, thereby contributing to an increased utilization rate across all pore sizes. Reduced fracture development results in a lower fluid utilization across diverse pore types. This study deepens our understanding of the pivotal factors affecting spontaneous imbibition in tight reservoirs following fracturing. The findings act as theoretical, technical, and scientific foundations for optimizing fracturing strategies in tight oil reservoir transformations.

关键词： Tight oil reservoir Spontaneous imbibition Nuclear magnetic resonance Slickwater fracturing fluid Fluid utilization degree

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命令式动态规划类算法程序推导及机械化验证

软件学报 2024年第9期35卷 4218-4241页

作者：左正康孙欢王昌晶游珍黄箐王唱唱江西师范大学数字产业学院江西上饶334006 江西师范大学计算机信息工程学院江西南昌330022 网络化支撑软件国家国际科技合作基地(江西师范大学) 江西南昌330022

动态规划是一种递归求解问题最优解的方法,主要通过求解子问题的解并组合这些解来求解原问题.由于其子问题之间存在大量依赖关系和约束条件,所以验证过程繁琐,尤其对命令式动态规划类算法程序正确性验证是一个难点.基于动态规划类算法Is... 详细信息

动态规划是一种递归求解问题最优解的方法,主要通过求解子问题的解并组合这些解来求解原问题.由于其子问题之间存在大量依赖关系和约束条件,所以验证过程繁琐,尤其对命令式动态规划类算法程序正确性验证是一个难点.基于动态规划类算法Isabelle/HOL函数式建模与验证,通过证明命令式动态规划类算法程序与其的等价性,避免证明正确性时处理复杂的依赖关系和约束条件,提出命令式动态规划类算法程序设计框架及其机械化验证.首先,根据动态规划类算法的优化方法(备忘录方法)和性质(最优子结构性质和子问题重叠性质)描述问题规约、归纳递推关系式和形式化构造出循环不变式,并且基于递推关系式生成IMP(minimalistic imperative programming language)代码;其次,将问题规约、循环不变式和生成的IMP代码输入VCG(verification condition generator),自动生成正确性的验证条件;然后,在Isabelle/HOL定理证明器中对验证条件进行机械化验证.算法首先设计为命令式动态规划类算法的一般形式,并进一步实例化得到具体算法.最后,例证所提框架的有效性,为动态规划类算法的自动化推导和验证提供参考价值.

关键词： Isabelle/HOL 机械化验证动态规划命令式 VCG

Statement on Establishment of Public Health Protection Guideline for Cold Spells—China

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China CDC weekly 2024年第5期6卷 92-94页

作者： Tiantian Li qinghua Sun Chen Chen qing Wang Jie Ban Runmei Ma Yi Zhang Lijun Pan Yuanyuan Liu Qiutong Li Leyao chang Hanshuo Zhang Yirong Liu Miaoyou Niu Xiangxiang Wei Lin Wang China CDC Key Laboratory of Environment and Population Health National Institute of Environmental HealthChinese Center for Disease Control and PreventionBeijingChina

Cold spells are extreme weather events characterized by the invasion of cold air from high latitudes into the middle and low latitudes,resulting in significant *** spells have various adverse health effects,including epidermal damage,respiratory tract spasms,respiratory immune abnormalities,acute cardiopulmonary diseases,and exacerbation of urinary and endocrine *** response to the frequent cold spells in recent years.

关键词： respiratory invasion acute

《金融稳定法》中危机银行处置信息披露机制的法律完善

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东南大学学报（哲学社会科学版） 2024年第4期26卷 77-86,151,F0002页

作者：常健王清粤海南大学法学院海南海口570228

《金融稳定法(草案)》首次将金融风险处置中的信息披露问题上升至法律层面。信息披露一直是金融监管领域的热门议题,已渗透到金融监管的各个环节,在危机银行处置中也不乏信息披露的身影。基于商业银行经营方式的特殊性及其在国民经济中... 详细信息

《金融稳定法(草案)》首次将金融风险处置中的信息披露问题上升至法律层面。信息披露一直是金融监管领域的热门议题,已渗透到金融监管的各个环节,在危机银行处置中也不乏信息披露的身影。基于商业银行经营方式的特殊性及其在国民经济中的核心地位,商业银行的信息披露较其他行业而言具有更高的透明度要求。尤其在危机银行处置过程中,信息披露关乎金融安全与金融稳定,对防范和化解系统性金融风险具有重要意义。在我国以包商银行案为代表的危机银行处置中,信息披露仍面临着缺乏系统完备的信息披露法律规则设计、缺乏透明度导向、规范化程度有待提高、缺乏风险预警功效等问题。亟需完善以提高透明度为导向的信息披露相关规则,应从主体、方式、内容层面提高信息披露的规范性,健全危机银行信息披露的风险预警机制,并注重危机处置后信息披露效应的持续性评估,以期对我国《金融稳定法》中有关危机银行处置中信息披露机制的完善有所裨益。

关键词：金融风险银行危机处置信息披露《金融稳定法》

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人格塑造和思维开发是学校教育的首要任务

教学与管理 2024年第25期 1-6页

作者：刘庆昌山西大学教育科学学院太原030006

学校教育需要立德树人,促进学生全面发展,为达此目的而进行的课程与教学革新总体上指向学生的理想人格和理性思维。在此背景下,学校教育工作者也应当顺应客观的要求和教育发展的趋势,形成如下的共识:一是学校教育不能将思维等闲视之;二... 详细信息

学校教育需要立德树人,促进学生全面发展,为达此目的而进行的课程与教学革新总体上指向学生的理想人格和理性思维。在此背景下,学校教育工作者也应当顺应客观的要求和教育发展的趋势,形成如下的共识:一是学校教育不能将思维等闲视之;二是人格不能徘徊在教育目标之外;三是学校教育应以塑造人格、开发思维为其要务;四是人格塑造与思维开发密不可分。

关键词：思维开发人格塑造学校教育

The siphonic energy transfer between hot solar wind and cold martian ionosphere through open magnetic flux rope

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Fundamental Research 2024年第4期4卷 882-889页

作者： Xiaojun Xu Lou-Chuang Lee Qi Xu qing chang jing Wang Ming Wang Shaosui Xu Christian Mosti Charles J.Farrugia Xing Wang Yudong Ye Zilu Zhou Lei Luo Peishan He Shaoguan Cheng State Key Laboratory of Lunar and Planetary Sciences Macao University of Science and TechnologyMacao 999078China CNSA Macao Center for Space Exploration and Science Macao 999078China Institute of Earth Science Academia SinicaTaipei 115029China Institute of Space Science and Applied Technology Harbin Institute of TechnologyShenzhen 518000China Planetary Environmental and Astrobiological Research Laboratory(PEARL) School of Atmospheric SciencesSun Yat-sen UniversityZhuhai 519000China Nanjing University of Information Science and Technology Nanjing 210000China Space ScienceLaboratory Universityof CaliforniaBerkeleyCA94320USA Space Research Institute Austrian Academy of SciencesGraz 8010Austria University of New Hampshire NH 03824USA

A mechanism for energy transfer from the solar wind to the Martian ionosphere through open magnetic flux rope is proposed based on the observations by Mars Atmosphere and Volatile EvolutioN(MAVEN).The satellite was located in the dayside magnetosheath at an altitude of about 70o km above the northern *** between the hot solar wind protons and the cold heavy ions/neutrals in the subsolar region can cool the protons and heat the heavy *** a result,the magnetosheath protons are siphoned into the ionosphere due to the thermal pressure gradient of protons and the heated heavy ions escape along the open magnetic field *** direct collisions in the lower-altitude region were not detected,this physical process is demonstrated by MAVEN measurements of enhanced proton density,decreased proton temperature and oppositely directed motions of hot and cool protons within the flux rope,which are very different from the observational features of the flux transfer events near the Earth's *** mechanism could universally exist in many contexts where a collisionless plasma region is connected to a collisional plasma *** reconstructing the magnetic geometry and the cross-section of the flux rope using the Grad-Shafranov technique,the ion loss rates are quantitatively estimated to be on the order of 1023 s-l,which is much higher than previously estimated.

关键词： Mars Flux rope Solarwind Ionosphere Ion loss