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Magnetic Order and Its Interplay with Structure Phase Transition in van der Waals Ferromagnet VI_(3)

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Chinese Physics Letters 2021年第9期38卷 69-73页

作者： Yiqing Hao Yiqing gu yimeng gu Erxi Feng Huibo Cao Songxue Chi Hua Wu Jun Zhao State Key Laboratory of Surface Physics and Department of PhysicsFudan UniversityShanghai 200433China Shanghai Qi Zhi Institute Shanghai 200232China Neutron Scattering Division Oak Ridge National LaboratoryOak RidgeTennessee 37831USA Laboratory for Computational Physical Sciences(MOE) Fudan UniversityShanghai 200433China Institute of Nanoelectronics and Quantum Computing Fudan UniversityShanghai 200433China Shanghai Research Center for Quantum Sciences Shanghai 201315China

Van der Waals magnet VI_(3) demonstrates intriguing magnetic properties that render it great for use in various ***,its microscopic magnetic structure has not been determined ***,we report neutron diffraction and susceptibility measurements in VI_(3) that revealed a ferromagnetic order with the moment direction tilted from the c-axis by ~36° at 4 K.A spin reorientation accompanied by a structure distortion within the honeycomb plane is observed,before the magnetic order completely disappears at TC=50 *** refined magnetic moment of ~1.3μB at 4 K is much lower than the fully ordered spin moment of 2μB/V^(3+),suggesting the presence of a considerable orbital moment antiparallel to the spin moment and strong spin-orbit coupling in VI_(3).This results in strong magnetoelastic interactions that make the magnetic properties of VI_(3) easily tunable via strain and pressure.

关键词： Transition refined render

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午休和夜间睡眠与心血管代谢性共病的关系

中西医结合心脑血管病杂志 2024年第15期22卷 2689-2695页

作者：吴艳艳王如梦白艳君汤紫薇谷依檬韩森福薛梅北京中医药大学研究生院北京100029 国家中医心血管病临床医学研究中心、中国中医科学院西苑医院北京100091

目的:探讨我国60岁及以上人群睡眠情况与心血管代谢性共病风险的关系。方法:基于中国健康与养老追踪调查(CHARLS)2011年和2015年的数据,选取基线期无心血管代谢性共病且参与2015年随访的人群(年龄≥60岁)作为研究对象。采用多因素Logis... 详细信息

目的:探讨我国60岁及以上人群睡眠情况与心血管代谢性共病风险的关系。方法:基于中国健康与养老追踪调查(CHARLS)2011年和2015年的数据,选取基线期无心血管代谢性共病且参与2015年随访的人群(年龄≥60岁)作为研究对象。采用多因素Logistic回归模型探讨睡眠情况(午休时间、午休长短、夜间睡眠时间、夜间睡眠长短、睡眠质量)与心血管代谢性共病风险的关联。根据高血压、血脂异常、糖尿病、抑郁、心脏病进行亚组分析,探讨午休长短与心血管代谢性共病发病的关系。结果:共纳入6829例研究对象。多因素Logistic回归分析结果显示,与不午休(0 min)相比,长午休(≥30 min)的心血管代谢性共病风险升高[OR=1.40,95%CI(1.08,1.82),P9 h)的心血管代谢性共病风险降低[OR=0.36,95%CI(0.14,0.90),P0.05)。结论:在我国60岁及以上的人群中,长午休(≥30 min)会增加心血管代谢性共病的发病风险,夜间长睡眠(>9 h)可能会降低心血管代谢性共病的发病风险。

关键词：心血管代谢性共病午休时间夜间睡眠时间 Logistic模型

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A toolbox for genetic manipulation in intestinal Clostridium symbiosum

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Synthetic and Systems Biotechnology 2024年第1期9卷 43-54页

作者： Pengjie Yang Jinzhong Tian Lu Zhang Hui Zhang Gaohua Yang yimeng Ren Jingyuan Fang Yang gu Weihong Jiang CAS-Key Laboratory of Synthetic Biology CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai200032China University of Chinese Academy of Sciences Beijing100049China Xianghu Laboratory Hangzhou311231China NHC Key Laboratory of Digestive Diseases Division of Gastroenterology and HepatologyShanghai Institute of Digestive DiseaseRenji HospitalSchool of MedicineShanghai Jiao Tong University145 Middle Shandong RoadShanghai200001China Shenzhen Branch Guangdong Laboratory for Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of AgricultureAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhen518120China The Wallenberg Laboratory Department of Molecular and Clinical MedicineSahlgrenska AcademyUniversity of GothenburgBruna Straket 16Gothenburg41345Sweden

gut microbes are closely related with human health,but remain much to *** symbiosum is a conditionally pathogenic human gut bacterium and regarded as a potential biomarker for early diagnosis of intestinal ***,the absence of an efficient toolbox that allows diverse genetic manipulations of this bacterium limits its in-depth ***,we obtained the complete genome sequence of *** ATCC 14940,a representative strain of *** this basis,we further developed a series of genetic manipulation methods for this ***,following the identification of a functional replicon pBP1 in *** ATCC 14940,a highly efficient conjugative DNA transfer method was established,enabling the rapid introduction of exogenous plasmids into ***,we constructed a dual-plasmid CRISPR/Cas12a system for genome editing in this bacterium,reaching over 60% repression for most of the chosen genes as well as efficient deletion(>90%)of three target ***,this toolbox was used for the identification of crucial functional genes,involving growth,synthesis of important metabolites,and virulence of *** ATCC *** work has effectively established and optimized genome editing methods in intestinal ***,thereby providing strong support for further basic and application research in this bacterium.

关键词： gut Clostridium symbiosum Toolbox Gene overexpression Gene deletion Gene regulation

The Inherent Law of the Unpredictability of Financial Asset Price Fluctuations: Multistability and Chaos

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Journal of Systems Science & Complexity 2024年第2期37卷 776-804页

作者： gu Enguo Huanghe University of Science and Technology Zhengzhou 450006China

This paper aims at understanding the price dynamics generated by the interaction of traders relying on heterogeneous expectations in an asset pricing *** the present work the authors analyze a financial market populated by five types of boundedly rational speculators-two types of fundamentalists,two types of chartists and trend followers which submit buying/selling orders according to different trading *** authors formulate a stock market model represented as a 2 dimensional piecewise linear discontinuous *** proposed contribution to the existing financial literature is two ***,the authors perform study of the model involving a 2 dimensional piecewise linear discontinuous map through a combination of qualitative and quantitative *** authors focus on the existence conditions of chaos and the multi-stability regions in parameter *** border collision bifurcation curves and basins of multi-attractors are also *** authors find that chaos or quasi-period exists only in the case of fixed point being a saddle(regular or flip)and that the coexistence of multiple attractors may exist when the fixed point is an attractor,but it is common for spiral and flip fixed points.

关键词： BCB curve chaos financial market heterogeneous agents multiple attractors piecewise linear discontinuous map

基于免疫炎症学说中医药防治动脉粥样硬化研究

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中国中医基础医学杂志 2022年第7期28卷 1192-1198页

作者：汤紫薇谷依檬薛梅中国中医科学院西苑医院北京100091

动脉粥样硬化引起的斑块破裂、血栓形成是导致心血管病发病的病理基础,防治动脉粥样硬化是降低心血管病发病率、死亡率的关键。中医药通过调节免疫炎症反应防治动脉粥样硬化是目前研究的热点之一,以活血化瘀、化痰祛浊解毒等治法为主的... 详细信息

动脉粥样硬化引起的斑块破裂、血栓形成是导致心血管病发病的病理基础,防治动脉粥样硬化是降低心血管病发病率、死亡率的关键。中医药通过调节免疫炎症反应防治动脉粥样硬化是目前研究的热点之一,以活血化瘀、化痰祛浊解毒等治法为主的复方、单体中药被证实可通过相关免疫炎症通路调控动脉粥样硬化的形成与发展,涉及的通路包括包括核因子κB通路、丝裂原活化蛋白激酶通路、Toll样受体通路、炎症小体通路等。炎症通路的复杂、交叉重合及中药药物成分的复杂性导致抗动脉粥样硬化的免疫炎症机制研究尚不明确,仍缺乏疗效评估的高级别循证医学证据。上述通路的研究仍然是目前的热点内容,尤其炎症小体通路值得未来深入探索,也为中药基于免疫抗炎治疗AS提供了新靶点和研究方向。

关键词：动脉粥样硬化中医药免疫炎症

Volume of fluid simulation of single argon bubble dynamics in liquid steel under RH vacuum conditions

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Journal of Iron and Steel Research International 2024年第4期31卷 828-837页

作者： gu-jun Chen Sheng-ping He College of Materials Science and Engineering Yangtze Normal UniversityChongqing 400044China College of Materials Science and Engineering Chongqing UniversityChongqing 400044China

Single argon bubble dynamics in liquid steel under Ruhrstahl-Heraeus(RH)vacuum conditions were simulated using the volume of fluid method,and the ideal gas law was used to consider bubble growth due to heat transfer and pressure *** simulation with a constant bubble density was also performed to validate the numerical method,and the predicted terminal bubble shape and velocity were found to agree with those presented in the Grace diagram and calculated by drag correlation,*** simulation results under RH conditions indicate that the terminal bubble shape and velocity cannot be *** primary bubble growth occurs within a rising distance of 0.3 m owing to heating by the high-temperature liquid steel;subsequently,the bubble continues to grow under equilibrium with the hydrostatic *** the initial diameter is 8-32 mm,the bubble diameter and rising velocity near the liquid surface are 80-200 mm and 0.5-0.8 m/s,*** bubble rises rectilinearly with an axisymmetric shape,and the shape evolution history includes an initial sphere,(dimpled)ellipsoid,and spherical cap with satellite bubbles.

关键词： Bubble dynamics Liquid steel Volume of fluid Bubble growth Bubble shape Rising velocity

Ultra-simplified diffraction-based computational spectrometer

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Light(Science & Applications) 2024年第6期13卷 1022-1031页

作者： Chuangchuang Chen Honggang gu Shiyuan Liu State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and TechnologyWuhanHubei430074China Optics Valley Laboratory WuhanHubei430074China

Miniaturizing spectrometers for compact and cost-effective mobile platforms is a major challenge in current spectroscopy research,where conventional spectrometers are impractical due to their bulky *** miniaturized designs primarily rely on precalibrated response functions of nanophotonic structures to encode spectral information captured in a snapshot by detector *** spectrum reconstruction is achieved through computational techniques,but this requires precise component design,high-precision fabrication,and *** propose an ultra-simplified computational spectrometer that employs a one-to-broadband diffraction decomposition strategy facilitated by a numerical regularized transform that depends only on the spectrum of the diffracted *** key feature of our design is the use of a simple,arbitrarily shaped pinhole as the partial disperser,eliminating the need for complex encoding designs and full spectrum *** spectrometer achieves a reconstructed spectral peak location accuracy of better than 1 nm over a 200 nm bandwidth and excellent resolution for peaks separated by 3 nm in a bimodal spectrum,all within a compact footprint of under half an ***,our approach also reveals a breakthrough in broadband coherent diffractive imaging without requiring any prior knowledge of the broadband illumination spectrum,assumptions of non-dispersive specimens,or correction for detector quantum efficiency.

关键词： simplified spectrum illumination

An internal ballistic model of electromagnetic railgun based on PFN coupled with multi-physical field and experimental validation

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Defence Technology（防务技术） 2024年第2期32卷 254-261页

作者： Benfeng gu Haiyuan Li Baoming Li National Key Laboratory of Transient Physics Nanjing University of Science and TechnologyNanjing 210094China

To accelerate the practicality of electromagnetic railguns,it is necessary to use a combination of threedimensional numerical simulation and experiments to study the mechanism of bore *** this paper,a three-dimensional numerical model of the augmented railgun with four parallel unconventional rails is introduced to simulate the internal ballistic process and realize the multi-physics field coupling calculation of the rail gun,and a test experiment of a medium-caliber electromagnetic launcher powered by pulse formation network(PFN)is carried *** test methods such as spectrometer,fiber grating and high-speed camera are used to test several parameters such as muzzle initial velocity,transient magnetic field strength and stress-strain of *** the simulation results and experimental data,the damage condition of the contact surface is analyzed.

关键词： Internal ballistic modeling Electromagnetic rail gun Multi-physics field coupling Experimental validation PFN

Prediction of liquid circulation flow rate in RH degasser:improvement of decarburization at low atmospheric pressure

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Journal of Iron and Steel Research International 2024年第7期31卷 1661-1667页

The two-fluid model coupled with population balance model was used for simulating the gas-liquid flow in the Ruhrstahl-Heraeus(RH)*** predicted circulation flow rate was compared with that measured from a water model experiment to validate the mathematical ***,influence of snorkel immersion depth on liquid circulation flow rate was numerically investigated under an atmospheric pressure of 101 and 84 kPa,*** result indicates that the circulation flow rate of the RH degasser in the high-altitude area was severely reduced because of the decrease in atmospheric ***,increasing the snorkel immersion depth from 0.5 to 0.7 m can compensate for the decrease in atmospheric *** test result indicates that decarburization rate is significantly enhanced by increasing the snorkel immersion *** optimization,the percentage of heats with a final carbon content less than 0.002 wt.%is significantly increased from 22.0%to 96.4%.

关键词： RH degasser Two-fluid model Population balance model-Circulation flow rate Decarburization Snorkel immersion depth