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二叶主动脉瓣伴动脉夹层破裂1例

法医学杂志 2024年第1期40卷 77-79页

作者：徐碧宇吴晨阳姬艳琦李莹莹宋旭东华北理工大学附属医院病理科河北唐山063000

1案例1.1简要案情及病史摘要某男,35岁,因“持续性胸闷18 h”入院。入院后1 h行急性冠状动脉造影检查示:左冠状动脉开口及起源正常,左主干、前降支及回旋支正常,可见前降支至右冠状动脉侧支形成,血流分级(thrombolysis in myocardial in... 详细信息

1案例1.1简要案情及病史摘要某男,35岁,因“持续性胸闷18 h”入院。入院后1 h行急性冠状动脉造影检查示:左冠状动脉开口及起源正常,左主干、前降支及回旋支正常,可见前降支至右冠状动脉侧支形成,血流分级(thrombolysis in myocardial infarction,TImI)1级;右冠状动脉开口朝上变异,近段次全闭塞,前向血流TImI1级;结论为右冠状动脉单支病变,右冠状动脉开口朝上变异,冠状动脉分布呈右优势型。遂于右冠状动脉近段植入HELICOS(4.0 mm×22.0 mm)支架1枚。

关键词：法医病理学二叶主动脉瓣主动脉夹层动脉夹层破裂

magnetohydrodynamic flows tuning in a conduit with multiple channels under a magnetic field applied perpendicular to the plane of flow

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Journal of Hydrodynamics 2017年第2期29卷 332-343页

作者： y.Luo C.N.Kim m.q.Zhu Department of mechanical Engineering Graduate SchoolKyung Hee UniversityYong-inKorea Department of mechanical Engineering College of EngineeringKyung Hee UniversityYong-inKorea

In this study, three-dimensional liquid-metal magnetohydrodynamic flows in a conduit with multiple channels under a uniform magnetic field are numerically investigated. The geometry of the conduit is of a four-parallel-channels system including one inflow channel and three outflow channels. The liquid-metal flows into the inflow channel, then turns through 180° in the transi- tion segment, finally flows into three different outflow channels. This kind of channel system can induce counter flow and co-flow, which is rarely investigated before though the conceptual designs of duct flow in the blanket have suggested this type of flow. A structured grid system is chosen after a series of mesh independence tests in the present study. The axial velocity in the side layer near the first partitioning wall, located between the inflow channel and the first outflow channel, is the highest with the lowest electric potential formed therein. The pressure almost linearly decreases in the main flow direction, except in the transition segment. moreover, the pressure gradient in the first outflow channel is the largest among the three outflow channels. The interdependency of the current, fluid velocity, pressure, electric potential is examined in order to describe the electromagnetic characteristics of the liquid-metal flows.

关键词： Liquid-metal magnetohydrodynamics multiple channels

Impact of different intravenous bolus rates on fluid and electrolyte balance and mortality in critically ill patients

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World Journal of Critical Care medicine 2024年第3期13卷 17-24页

作者： mutaz I Othman Emad m mustafa moayad Alfayoumi mohamad y Khatib Abdulqadir J Nashwan Department of Nursing Hamad Medical CorporationDoha 3050Qatar Department of Pharmacy Hamad Medical CorporationDoha 3050Qatar Department of Critical Care Hamad Medical CorporationDoha 3050Qatar

The effect of intravenous bolus rates on patient outcomes is a complex and crucial aspect of critical *** challenges are commonly used in critically ill patients to manage their hemodynamic status,but there is limited information available on the specifics of when,how much,and at what rate fluids should be administered during these *** aim of this review is to thoroughly examine the relationship between intravenous bolus rates,fluid-electrolyte balance,and mortality and to analyze key research findings and methodologies to understand these complex dynamics *** challenges are commonly employed in managing hemodynamic status in this population,yet there is limited information on the optimal timing,volume,and rate of fluid *** a narrative review approach,the analysis identified nine relevant studies that investigate these *** findings underscore the importance of a precise and individualized approach in clinical settings,highlighting the need to tailor intravenous bolus rates to each patient's specific needs to maximize *** review provides valuable insights that can inform and optimize clinical practices in critical care,emphasizing the necessity of meticulous and exact strategies in fluid administration.

关键词： Fluid balance Fluid resuscitation Intensive care unit Precision medicine mortality

Harmonic balance-based approach for optimal time delay to control unstable periodic orbits of chaotic systems

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Acta mechanica Sinica 2020年第4期36卷 918-925页

作者： y.m.Chen q.X.Liu J.K.Liu Department of mechanics Sun Yat-sen UniversityGuangzhou 510275China

As a classical technique for chaos suppression,the time-delayed feedback controlling strategy has been widely developed by stabilizing unstable periodic orbits(UPOs)embedded in chaotic systems.A critical issue for achieving high controlling precision is to search for an appropriate time *** paper proposes a simple yet effective approach,based on incremental harmonic balance method,to determine the optimal time delay in the delayed feedback *** time delay is adjusted within the iterative scheme provided by the proposed method,and finally converges to the period of the target *** long as the optimal time delay is fixed,moreover,the attained solution makes it quite convenient to analyze its stability according to the Floquet theory,which further provides the effective interval of the feedback gain.

关键词： Chaos control Unstable periodic orbit Delayed feedback Optimal time delay Incremental harmonic balance method

基于平扫和不同期相增强CT预测胃肠道间质瘤高Ki-67增殖指数

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国际医学放射学杂志 2024年第3期 376-377页

作者： Z.Xie S.Suo W.Zhang q.Zhang y.Dai y.Song 余翔玲

摘要目的评估和分析基于平扫和对比增强不同期相CT的影像组学模型，以预测经病理证实的胃肠道间质瘤（GIST）病人的Ki-67增殖指数（PI）。方法将383例经病理

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magnetism,optical,and thermoelectric response of CdFe_2O_4by using DFT scheme

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Chinese Physics B 2018年第3期27卷 376-383页

作者： q mahmood m yaseen K C Bhamu Asif mahmood y Javed Shahid m Ramay materials Growth and Simulation Laboratory Department of PhysicsUniversity of the Punjab Department of Physics University of AgricultureFaisalabad Department of Physics Goa University Chemical Engineering Department College of Engineering King Saud University Physics and Astronomy Department College of Science King Saud University

Comparative analysis of electronic, magnetic, optical, and thermoelectric properties of CdFe2O4, calculated by em- ploying PBEsol ＋ mBJ has been done. The PBEsol reveals metallic nature, while TB-mBJ illustrates ferromagnetic semiconducting behavior. The reasons behind the origin of ferromagnetism are explored by observing the exchange, crystal field, and John-Teller energies. The optical nature is investigated by analyzing dielectric constants, refraction, absorption coefficient, reflectivity, and optical conductivity. Finally, thermoelectric properties are elaborated by describing the electri- cal and thermal conductivities, Seebeck coefficient, and power factor. The strong absorption for the visible energy and high power factor suggest CdFe2O4 as the potential candidate for renewable energy applications.

关键词： frustrated magnetism density functional theory John-Teller distortion Hund's rule

公元241~1912年中国河西走廊地区年际干湿变化与游牧战争的关系

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中国科学：地球科学 2024年第6期54卷 1950-1959页

作者：唐飞史志林田沁花杜小刚张永中国科学院地理科学与资源研究所陆地表层格局与模拟院重点实验室北京100101 兰州大学敦煌学研究所兰州730020 中国气象局国家气候中心北京100081 甘肃祁连山国家级自然保护区管护中心隆畅河自然保护站张掖734400 中国科学院大学北京100049

长期以来,气候与战争之间的关系一直是一个备受关注的科学和社会问题.在本研究中,探讨了公元241年以来中国河西走廊地区气候与战争爆发的可能关联.基于河西走廊地区树轮资料以及历史时期游牧战争数据,利用时序叠加分析方法,我们发现河... 详细信息

长期以来,气候与战争之间的关系一直是一个备受关注的科学和社会问题.在本研究中,探讨了公元241年以来中国河西走廊地区气候与战争爆发的可能关联.基于河西走廊地区树轮资料以及历史时期游牧战争数据,利用时序叠加分析方法,我们发现河西走廊地区年际干湿变化与游牧民族发动的战争之间存在明显的相关性,但是这种关系是动态的,并与该地区的政权格局有关.在河西走廊存在多个地方政权统治的时期,战争往往随着干旱的气候条件而发生,这可能是由于这些时期的异常干旱加剧了对资源和土地的争夺.相反,在统一王朝管理时期,气候湿润时更容易发生战争,因为牧场的扩大和资源的积累有助于游牧民族的对外征服.这些发现凸显了战争与气候变化之间关系的复杂性.为了更加全面地分析二者之间的关系,需要在更多地区建立覆盖范围更广、分布更均匀且连续的高分辨率历史温湿数据集.此外,对于具有独特特征的区域,需要收集更多的历史战争数据,进行分类讨论研究.

关键词：干旱年际干湿变化战争河西走廊树轮游牧民族

Role of extrusion rate on the microstructure and tensile properties evolution of ultrahigh-strength low-alloy mg-1.0Al-1.0Ca-0.4mn(wt.%)alloy

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Journal of magnesium and Alloys 2023年第2期11卷 553-561页

作者： X.q.Liu X.G.qiao R.S.Pei y.q.Chi L.yuan m.y.Zheng School of material Science and Engineering Harbin Institute of TechnologyHarbin 150001China Institut fur metallkunde und meterialphysik RWTH Aachen UniversityAachen D-52056Germany

mg-1.0Al-1.0Ca-0.4mn(AXm1104, wt.%) low alloy was extruded at 200 ℃ with an extrusion ratio of 25 and different ram speeds from 1.0 to 7.0 mm/s. The influence of extrusion rate on microstructure and mechanical properties of the AXm1104 alloy was systematically studied. With the increasing of extrusion rate, the mean dynamically recrystallized(DRXed) grain size of the low alloy and average particles diameter of precipitate second phases were increased, while the degree of grain boundary segregation and the intensity of the basal fiber texture were decreased. With the rising of extrusion rate from 1.0 to 7.0 mm/s, the tensile yield strength(TyS) of the as-extruded AXm1104 alloy was decreased from 445 mPa to 249 mPa, while the elongation to failure(EL) was increased from 5.0% to 17.6%. The TyS, ultimate tensile strength(UTS) and EL of the AXm1104 alloy extruded at the ram speed of 1.5 mm/s was 412 mPa, 419 mPa and 12.0%, respectively,exhibiting comprehensive tensile mechanical properties with ultra-high strength and excellent plasticity. The ultra-high TyS of 412 mPa was mainly due to the strengthening from ultra-fine DRXed grains with segregation of solute atoms at grain boundaries. The strain hardening rate is increase slightly with increasing extrusion speed, which may be ascribed to the increasing mean DRXed grain size with rising extrusion speed. The higher strain hardening rate contributes to the higher EL of these AXm1104 samples extruded at higher ram speed.

关键词： mg-Al-Ca-mn alloy Ultrafine grain Extrusion rate Grain boundary segregation microstructure Ultrahigh strength

Numerical Simulation of Electroosmotic Flow near Earthworm Surface

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Journal of Bionic Engineering 2006年第4期3卷 179-186页

作者： y.q. Zu y.y. yan School of the Built Environment The University of Nottingham Nottingham NG7 2RD UK

The electroosmotic flow near an earthworm surface is simulated numerically to further understand the anti soil adhesion mechanism of earthworm. A lattice Poisson method is employed to solve electric potential and charge .distributiorts in the electric double layer along the earthworm surface. The external electric field is obtained by solving a Laplace equation. The electroosmotic flow controlled by the Navier-Stokes equations with external body force is simulated by the lattice Boltzmann method. A benchmark test shows that accurate electric potential distributions can be obtained by the LPm. The simulation shows that the moving vortices, which probably contribute to anti soil adhesion, are formed near earthworm body surface by the nonuniform and variational electrical force.

关键词： electroosmotic flow earthworm anti-adhesion LBm EDL