检索结果-南通市图书馆

A Local Macroscopic Conservative(LoMaC)Low Rank Tensor Method with the Discontinuous Galerkin Method for the Vlasov Dynamics

引用

Communications on Applied Mathematics and Computation 2024年第1期6卷 550-575页

作者： Wei Guo Jannatul Ferdous ema Jing-Mei Qiu Department of Mathematics and Statistics Texas Tech UniversityLubbockTX70409USA Department of Mathematical Sciences University of DelawareNewarkDE19716USA

In this paper,we propose a novel Local Macroscopic Conservative(LoMaC)low rank tensor method with discontinuous Galerkin(DG)discretization for the physical and phase spaces for simulating the Vlasov-Poisson(VP)*** LoMaC property refers to the exact local conservation of macroscopic mass,momentum,and energy at the discrete *** recently developed LoMaC low rank tensor algorithm(arXiv:2207.00518)simultaneously evolves the macroscopic conservation laws of mass,momentum,and energy using the kinetic flux vector splitting;then the LoMaC property is realized by projecting the low rank kinetic solution onto a subspace that shares the same macroscopic *** paper is a generalization of our previous work,but with DG discretization to take advantage of its compactness and flexibility in handling boundary conditions and its superior accuracy in the long *** algorithm is developed in a similar fashion as that for a finite difference scheme,by observing that the DG method can be viewed equivalently in a nodal *** the nodal DG method,assuming a tensorized computational grid,one will be able to(i)derive differentiation matrices for different nodal points based on a DG upwind discretization of transport terms,and(ii)define a weighted inner product space based on the nodal DG grid *** algorithm can be extended to the high dimensional problems by hierarchical Tucker(HT)decomposition of solution tensors and a corresponding conservative projection *** a similar spirit,the algorithm can be extended to DG methods on nodal points of an unstructured mesh,or to other types of discretization,e.g.,the spectral method in velocity *** numerical results are performed to showcase the efficacy of the method.

关键词： Hierarchical Tucker(HT)decomposition Conservative SVD Energy conservation Discontinuous Galerkin(DG)method

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Protein glycation:a wolf in sweet sheep’s clothing behind neurodegeneration

引用

Neural Regeneration Research 2024年第5期19卷 975-976页

作者： Ana B.Uceda Francisco leal-Pérez Miquel Adrover Institut Universitari d’Investigacióen Ciències de la Salut(IUNICS) Institut d’InvestigacióSanitària Illes Balears(IdISBa) Departament de Química Universitat de les Illes BalearsCtraPalma de MallorcaSpain

At the beginning of the 16th century,Paracelsus coined the maxim:“the dose makes the poison”.This principle can be applied to all living organisms,including organs and *** brain and its glial and neuronal cells are ... 详细信息

关键词： organs sheep sweet

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Extracellular vesicles-coupled miRNAs from oviduct and uterus modulate signaling pathways related to lipid metabolism and bovine early embryo development

引用

Journal of Animal Science and Biotechnology 2024年第4期15卷 1528-1549页

作者： Rosane Mazzarella Karina Canon‑Beltran Yulia N.Cajas Meriem Hamdi Encina M.Gonzalez Juliano C.da Silveira Claudia L.V.leal D.Rizos Department of Animal Reproduction INIA-CSICMadridSpain Department of Biochemistry and Molecular Biology Veterinary FacultyComplutense University of Madrid(UCM)MadridSpain Department Agrarian Production Technical University of MadridUPMMadridSpain Departamento de Ciencias Biologicas Universidad Tecnica Particular de LojaUTPLLojaEcuador Department of Anatomy and Embryology FV-UCMMadridSpain Department of Veterinary Medicine FZEA-USPPirassunungaBrazil

Background Extracellular vesicles(EVs) present in oviductal(OF) and uterine fluid(UF) have been shown to enhance bovine embryo quality during in vitro culture by reducing lipid contents and modulating lipid metabolism-related genes(LMGs), while also influencing cell proliferation, suggesting their involvement on the regulation of different biological pathways. The regulation of signaling pathways related to cell differentiation, proliferation, and metabo-lism is crucial for early embryo development and can determine the success or failure of the pregnancy. Bioactive molecules within EVs in maternal reproductive fluids, such as micro RNAs(miRNAs), may contribute to this regulatory process as they modulate gene expression through post-transcriptional *** This study evaluated miRNA cargo in OF-EVs from the early luteal phase and UF-EVs from the mid-luteal phase, coinciding with embryo transit within oviduct and uterus in vivo, and its possible influence on LMGs and sign-aling pathways crucial for early embryo development. A total of 333 miRNAs were detected, with 11 exclusive to OF, 59 to UF, and 263 were common between both groups. From the 20 differentially expressed miRNAs, 19 up-regulated in UF-EVs(bta-miR-134, bta-miR-151-3p, bta-miR-155, bta-miR-188, bta-miR-181b, bta-miR-181d, bta-miR-224, bta-miR-23b-3p, bta-miR-24-3p, bta-miR-27a-3p, bta-miR-29a, bta-miR-324, bta-miR-326, bta-miR-345-3p, bta-miR-410, bta-miR-652, bta-miR-677, bta-miR-873 and bta-miR-708) and one(bta-miR-148b) in OF-EVs. These miRNAs were predicted to modulate several pathways such as Wnt, Hippo, MAPK, and lipid metabolism and degradation. Differ-ences in miRNAs found in OF-EVs from the early luteal phase and UF-EVs from mid-luteal phase may reflect differ-ent environments to meet the changing needs of the embryo. Additionally, miRNAs may be involved, particularly in the uterus, in the regulation of embryo lipid metabolism, immune system, and *** Our study su

关键词： Embryo-maternal interaction Epigenetic Exosomes Mammalian Preimplantation Reproductive fluids

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Sound waves and solutions:Point-of-care ultrasonography for acute kidney injury in cirrhosis

引用

World Journal of Critical Care Medicine 2024年第2期13卷 83-92页

作者： David Aguirre-Villarreal Mario Andrés de Jesús leal-Villarreal Ignacio García-Juárez Eduardo R Argaiz Abhilash Koratala Departamento de Gastroenterología Instituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMexico City 14080Mexico Cardiología Instituto Nacional de Cardiología Ignacio ChávezMexico City 14080Mexico Unidad de Hepatología y Trasplante Departamento de GastroenterologíaInstituto Nacional de Ciencias Medicas y Nutricion Salvador ZubiranMexico City 14080Mexico Departamento de Nefrología y Metabolismo Mineral Instituto Nacional de Ciencias Médicas y Nutrición Salvador ZubiránMexico City 14080Mexico Tecnológico de Monterrey Escuela de Medicina y Ciencias de la SaludMexico City 64710Mexico Department of Nephrology Medical College of WisconsinMilwaukeeWI 53226United States

This article delves into the intricate challenges of acute kidney injury(AKI)in cirrhosis,a condition fraught with high morbidity and *** complexities arise from distinguishing between various causes of AKI,particularly hemodynamic AKI,in cirrhotic patients,who experience hemodynamic changes due to portal *** term"hepatocardiorenal syndrome"is introduced to encapsulate the intricate interplay among the liver,heart,and *** narrative emphasizes the often-overlooked aspect of cardiac function in AKI assessments in cirrhosis,unveiling the prevalence of cirrhotic cardiomyopathy marked by impaired diastolic *** conventional empiric approach involving volume expansion and vasopressors for hepatorenal syndrome is critically analyzed,highlighting potential risks and variable patient *** advocate for a nuanced algorithm for AKI evaluation in cirrhosis,prominently featuring point-of-care ultrasonography(POCUS).POCUS applications encompass assessing fluid tolerance,detecting venous congestion,and evaluating cardiac function.

关键词： Point-of-care ultrasonography Bedside ultrasound Cirrhosis Congestion Acute kidney injury Congestive nephropathy

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Why microglia kill neurons after neural disorders? The friendly fire hypothesis

引用

Neural Regeneration Research 2019年第9期14卷 1499-1502页

作者： Walace Gomes-leal Laboratory of Experimental Neuroprotection and Neuroregeneration Institute of Biological Sciences Federal University of Para-Brazil

Neuroinflammation plays a fundamental role on the pathophysiology of acute and chronic neural *** activation is a major event following central nervous system inflammation displaying different phenotypes with beneficial and detrimental actions(a Janus face).The reason for this apparent duality is *** have previously shown that following experimental middle cerebral artery occlusion in the rat brain,microglia seem to support and impair adult neurogenesis in the same ischemic *** on these results,we raised the hypothesis that in the same pathologic environment,gradients of different ligands distributed over different anatomical niches might contribute to both detrimental and beneficial microglial *** ligands(“danger signals”)are released by dying cells and bind to microglial receptors in their *** of different microglial receptors induces downstream biochemical pathways culminating in a spectrum of microglial phenotypes like M1 and M2 and *** this paper,we first review the immune functions of microglia and the role of toll-like receptors on the fight against *** then briefly revise the dual role of microglia after neural *** then propose a novel hypothesis to explain the Janus face of microglia during the pathophysiology of central nervous system diseases:the“friendly fire hypothesis”.According to this idea“danger signals”or danger associated molecular patterns released by stressed,damaged and/or dying cells during stroke,trauma and other diseases might activate microglial pattern-recognition receptors(i.e.,toll like receptors)or other unidentified receptors normally activated by *** could activate the same genetic and biochemical machinery used by microglia to fight against pathogens even in the absence of *** to this notion,microglia may cause bystander neuronal damage with a kind of blind“friendly fire”,fighting against a non-existing infection during

关键词： stroke trauma Alzheimer’s disease neuroinflammation glial cells phenotypes degeneration neuroprotection

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Probing the fate of transplanted hematopoietic stem cells: is the combinational approach “FIT” for purpose?

引用

Science China(Life Sciences) 2020年第11期63卷 1755-1758页

作者： Fang Dong Hui Cheng Hideo ema Tao Cheng State Key Laboratory of Experimental Hematology National Clinical Research Center for Blood DiseasesInstitute of Hematology&Blood Diseases HospitalChinese Academy of Medical Sciences&Peking Union Medical CollegeTianjin 300020China Center for Stem Cell Medicine Chinese Academy of Medical SciencesTianjin 300020China Department of Stem Cell&Regenerative Medicine Peking Union Medical CollegeTianjin 300020China

Hematopoietic stem cells (HSCs)—with their self-renewal and multi-lineage differentiation potential—are top of the hematopoietic cell hierarchy. Stress conditions activate the quiescent HSCs, which in turn enter cel... 详细信息

关键词： hematopoietic al. stem

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Nonlinear Dynamics in a Nonextensive Complex Plasma with Viscous Electron Fluids

引用

Chinese Physics Letters 2016年第6期33卷 67-70页

作者： M.R. Hossen S.A. ema A.A. Mamun Department of Natural Sciences Daffodil International University Department of EEE Sonargaon University Department of Physics Jahangirnagar University

Cylindrical and spherical dust-electron-acoustic （DEA） shock waves and double layers in an unmagnetized, col- lisionless, complex or dusty plasma system are carried out. The plasma system is assumed to be composed of inertial and viscous cold electron fluids, nonextensive distributed hot electrons, Maxwellian ions, and negatively charged stationary dust grains. The standard reductive perturbation technique is used to derive the nonlinear dynamical equations, that is, the nonplanar Burgers equation and the nonplanar further Burgers equation. They are also numerically analyzed to investigate the basic features of shock waves and double layers （DLs）. It is observed that the roles of the viscous cold electron fluids, nonextensivity of hot electrons, and other plasma parameters in this investigation have significantly modified the basic features （such as, polarity, amplitude and width） of the nonplanar DEA shock waves and DLs. It is also observed that the strength of the shock is maximal for the spherical geometry, intermediate for cylindrical geometry, while it is minimal for the planar geometry. The findings of our results obtained from this theoretical investigation may be useful in understanding the nonlinear phenomena associated with the nonplanar DEA waves in both space and laboratory plasmas.

关键词： in on is as it of Nonlinear Dynamics in a Nonextensive Complex Plasma with Viscous Electron Fluids with

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A novel paradigm for feedback control in LPBF:layer-wise correction for overhang structures

引用

Advances in Manufacturing 2022年第2期10卷 326-344页

作者： ema Vasileska Ali Gokhan Demir Bianca Maria Colosimo Barbara Previtali Department of Mechanical Engineering Polytechnic University of MilanVia La Masa 120156 MilanItaly

In laser powder bed fusion(LPBF),it is common practice to select process parameters to achieve high density parts starting from simple geometries such as cubes or ***,additive manufacturing is usually adopted to producevery complex geometries,where parameters should be tuned locally,depending on the local features to be *** fact,geometrical features,such as overhangs,acute corners,and thin walls may lead to over-or under-heating conditions,which may result in geometrical inaccuracy,high roughness,volumetric errors(i.e.,porosity)oreven job failure due to *** work proposes a layer-wise control strategy to improve the geometrical precision of overhanging regions using a coaxial melt pool monitoring *** meltpool images acquired at each layer are used in a controlloop toadapt theprocess parameters locally at the next layer in order to minimize surface *** particular,the laser duty cycle is used as a controllable parameterto correct the energy *** work presents the main architecture of the proposed approach,the control strategy and the experimental procedure that need to be applied to design the control *** layer-wise control strategy was tested on AISI 316L stainless steel using an open LPFB *** results showed that the proposed layer-wise control solution results in a constant melt pool observed via the laser heated area size starting from the second layer onward,leading to a significant improvement in the geometrical accuracy of 5 mm-long bridge geometries.

关键词： Closed-loop control Melt pool monitoring:Defect correction Pulsed-wave emission

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

欧盟警示奈玛特韦片/利托那韦片组合包装与治疗窗窄的免疫抑制剂合用时严重和潜在致死性不良反应的风险

引用

中国药物警戒 2024年第4期21卷 434-434页

作者： ema网站国家药品不良反应监测中心

2024年2月9日,欧洲药品管理局(ema)的药物警戒风险评估委员会(PRAC)发布信息提示医务人员,奈玛特韦片/利托那韦片组合包装(商品名:Paxlovid)与某些安全剂量范围较窄(剂量的微小变化可能导致严重不良反应)的免疫抑制剂合并使用时,有发生... 详细信息

2024年2月9日,欧洲药品管理局(ema)的药物警戒风险评估委员会(PRAC)发布信息提示医务人员,奈玛特韦片/利托那韦片组合包装(商品名:Paxlovid)与某些安全剂量范围较窄(剂量的微小变化可能导致严重不良反应)的免疫抑制剂合并使用时,有发生严重和潜在致死性不良反应的风险,因为药物相互作用导致人体消除这些药物的能力降低。Paxlovid用于治疗伴有进展为重症高风险因素且不需要吸氧的新冠病毒感染的成人患者。相关的免疫抑制剂包括钙调神经磷酸酶抑制剂(他克莫司、环孢素)和mTOR抑制剂(依维莫司、西罗莫司),上述药物可降低免疫系统活性,常用于治疗某些自身免疫性疾病或防止移植器官排斥。

关键词：药物警戒利托那韦成人患者免疫抑制剂自身免疫性疾病药物相互作用组合包装西罗莫司

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欧盟药品安全委员会建议暂停己酸羟孕酮上市许可

引用

中国药物警戒 2024年第7期21卷 758-758页

作者： ema网站国家药品不良反应监测中心

欧洲药品管理局(ema)5月17日发布信息,称其药品安全委员会(PRAC)建议暂停己酸羟基孕酮(17-OHPC)在欧盟的上市许可。PRAC的一项评估发现,子宫暴露于己酸羟基孕酮的人群可能存在癌症风险,该风险尚未被完全证实。此外,评估认为己酸羟基孕... 详细信息

欧洲药品管理局(ema)5月17日发布信息,称其药品安全委员会(PRAC)建议暂停己酸羟基孕酮(17-OHPC)在欧盟的上市许可。PRAC的一项评估发现,子宫暴露于己酸羟基孕酮的人群可能存在癌症风险,该风险尚未被完全证实。此外,评估认为己酸羟基孕酮在预防早产方面无效,在其他适应症用途中有效性数据有限。在一些欧盟国家,己酸羟孕酮被批准作为注射剂用于预防孕妇流产或早产,以及治疗各种妇科疾病和生育障碍,包括缺乏黄体酮激素引起的疾病。PRAC回顾了一项基于人群的大型研究,该研究关注从出生起约50年内,子宫暴露于己酸羟孕酮的人群中罹患癌症的风险。这项研究的数据表明,与未接触该药物的人群相比,子宫暴露于己酸羟孕酮人群罹患癌症的风险可能增加。然而,PRAC指出,该研究中癌症病例数量较少,存在一些局限性,例如关于癌症危险因素的信息有限。因此,委员会得出结论认为,子宫暴露于己酸羟孕酮人群罹患癌症的风险是可能存在的,但由于不确定性,尚不能证实。

关键词：孕妇流产上市许可己酸羟孕酮病例数量药品安全妇科疾病危险因素黄体酮

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：