检索结果-南通市图书馆

Parallel Implicit-Explicit General Linear Methods

在线全文

学校读者我要写书评

暂无评论

Communications on Applied Mathematics and Computation 2021年第4期3卷 649-669页

作者： Steven Roberts Arash Sarshar Adrian sandu Computational Science Laboratory Virginia Polytechnic Institute and State UniversityBlacksburgVA 24060USA

High-order discretizations of partial differential equations(PDEs)necessitate high-order time integration schemes capable of handling both stiff and nonstiff operators in an efficient ***-explicit(IMEX)integration based on general linear methods(GLMs)offers an attractive solution due to their high stage and method order,as well as excellent stability *** IMEX characteristic allows stiff terms to be treated implicitly and nonstiff terms to be efficiently integrated *** work develops two systematic approaches for the development of IMEX GLMs of arbitrary order with stages that can be solved in *** first approach is based on diagonally implicit multi-stage integration methods(DIMSIMs)of types 3 and *** second is a parallel generalization of IMEX Euler and has the interesting feature that the linear stability is independent of the order of *** experiments confirm the theoretical rates of convergence and reveal that the new schemes are more efficient than serial IMEX GLMs and IMEX Runge-Kutta methods.

关键词： Parallel Time integration IMEX methods General linear

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

数据可视化,用设计“读懂”数据

艺术与设计 2024年第3期 16-35页

作者：谭智恒九月(译) 三度(图) 不详

我们生活在一个日益复杂的世界中。我们的日常生活涉及到与数以万计的信息的交互,主要通过视觉(如果视力正常的话)以及许多不同的物理和数字渠道。其中许多信息可能对我们而言并无意义或毫不相关,但却同样要求我们关注。信息图表成为我... 详细信息

我们生活在一个日益复杂的世界中。我们的日常生活涉及到与数以万计的信息的交互,主要通过视觉(如果视力正常的话)以及许多不同的物理和数字渠道。其中许多信息可能对我们而言并无意义或毫不相关,但却同样要求我们关注。信息图表成为我们更高效地理解世界的一种捷径。信息不再仅仅是单向传播以供我们消费。

关键词：单向传播数据可视化信息图表更高效读懂日常生活

Magnetic properties of glass-ceramics obtained by crystallization of iron-rich borosilicate glasses

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2017年第3期6卷 251-261页

作者： V. sandu E. CIMPOIASU A. KUNCSER M. S. NICOLESCU National Institute of Materials Physics Bucharest Magurele 077125 Romania Department of Physics US Naval Academy Annapolis MD USA National Institute of Materials Physics Bucharest Magurele 077125 RomaniaFaculty of Physics Bucharest University Bucharest-Magurele 077125 Romania

The specific dynamic magnetic response and magnetic relaxation phenomena in magnetite-based glass-ceramics by controlled crystallization of Fe-rich borosilicate glasses with 25 wt% Fe2O3, in the presence of two types of nucleating agents, Cr2O3 and P2O5, were investigated. The magnetic response is complex and shows contributions arising from two subsystems: a system with collective characteristics, superspin-glass like, and another one with single particle characteristics (superparamagnetic) with dipolar interaction. The nucleating agents have strong influence on the characteristic temperatures and anisotropy energy.

关键词： magnetite glass-ceramics AC susceptibility magnetic relaxation nucleating agent

Renewable energy in Australia:a wider policy discourse

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Population,Resources and Environment 2019年第3期17卷 241-253页

作者： Muyi Yang Suwin sandu Wenbo Li Muhammad Talal Khalid Centre for Energy Policy University of Technology SydneySydneyAustralia Business School Jiangsu Normal UniversityXuzhou JiangsuChina

This paper assesses the evolution of generation technology-mix in Australia,with specific emphasis on understanding how such evolution has been shaped by wider political and socioeconomic *** assessment is predicated on the argument that the contemporary,quintessentially techno-economic,policy discourse on renewable energy is deficient,as it ignores climacteric political and socio-economic influences on generation *** methodological framework employed in this paper is informed by the core tenets of technological change *** assessment suggests that generation technology-mix in Australia has historically been overwhelmingly influenced by the underlying technological paradigm of the electricity industry;and that this technological paradigm essentially draws its imprimatur from the wider political and socio-economic *** implication,it suggests that a rapid uptake of renewables will have widespread ramifications,extending into political,socio-economic and cultural realms of a ***,existing policy discourse-that tends to focus on technical potentials,cost competitiveness,externalities and risks of various renewable technologies-is deficient.A much broader discourse is *** paper also made an attempt to develop a basis for such a discourse by reviewing broader aspects of the Australian society that would be affected by a rapid uptake of renewables.

关键词： Electricity decarbonisation renewable energy policy discourse Australia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

复合藻协同吸附降解水中双酚A的研究

当代化工研究 2024年第12期 1-4页

作者：蔡聪育张小丹张小清谢三都闽南科技学院福建362332

模拟水中环境将小球藻、四尾栅藻、斜生栅藻三种藻类两两混合组成三种复合藻,研究其协同吸附降解双酚A的能力。研究结果表明:当双酚A浓度大于3 mg/L时,对藻的数量、形态、结构及分裂产生一定的影响,并且随双酚A浓度增大而愈加明显。在... 详细信息

模拟水中环境将小球藻、四尾栅藻、斜生栅藻三种藻类两两混合组成三种复合藻,研究其协同吸附降解双酚A的能力。研究结果表明:当双酚A浓度大于3 mg/L时,对藻的数量、形态、结构及分裂产生一定的影响,并且随双酚A浓度增大而愈加明显。在光照的条件下、双酚A初始浓度为3 mg/L、pH值为7、复合藻扩培比为20:150,小球藻-四尾栅藻复合藻吸附降解效果最佳,吸附降解达64.5%。

关键词：双酚A 复合藻吸附降解

Studying Formability Limits By Combining Conventional and Incremental Sheet Forming Process

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2021年第4期34卷 78-89页

作者： Fabio andre.Lora Daniel Fritzen Ricardo Alves de Sousa Lirio Schaffer Department of Materials Engineering Federal University of Recôncavo da BahiaCampus CETENSFeira de SantanaBahia 44085-132Brazil SATC Uni-versity CriciumaBrazil Center of Mechanical Technology and Automation Department of Mechanical EngineeringUniversity of Aveiro3810-193 AveiroPortugal Federal University of Rio Grande do Sul Porto AlegreBrazil

In this work it is assessed the potential of combining conventional and incremental sheet forming processes in a same sheet of *** so-called hybrid forming approach is performed through the manufacture of a pre-forming by conventional forming,followed by incremental sheet *** main objective is analyzing strain *** pre-forming induced in the conventional forming stage will determine the strain paths,directly influencing the strains produced by the incremental *** conduct the study,in the conventional processes,strains were imposed in three different ways with distinct true *** the incremental stage,the pyramid strategy was adopted with different wall *** the experiments,the true strains and the final geometries were *** simulation was also employed for the sake of comparison and correlation with the measured *** could be observed that single-stretch pre-strain was directly proportional to the maximum incremental strains achieved,whereas samples subjected to biaxial pre-strain influenced the formability according to the degree of pre-strain ***-strain driven by the prior deep-drawing operation did not result,in this particular geometry,in increased formability.

关键词： Hybrid forming process Incremental sheet forming Strain paths Numerical simulation

Towards high degree of c-axis orientation in MgB_(2) bulks

在线全文

学校读者我要写书评

暂无评论

Journal of Magnesium and Alloys 2022年第8期10卷 2173-2184页

作者： M.A.Grigoroscuta G.V.Aldica M.Burdusel V.sandu A.Kuncser I.Pasuk A.M.Ionescu T.S.Suzuki O.Vasylkiv P.Badica National Institute of Materials Physics 405A Street AtomistilorMagurele 077125Romania National Institute for Materials Science 1-2-1 SengenIbarakiTsukuba 305-0047Japan

The paper presents fabrication and characterization of spark plasma sintered textured(001) MgB_(2)with a record degree of orientation of about 40% and 16% by high-energy ultra-sonication and slip casting in high magnetic field(12 T) and 0 T magnetic field, *** characterization was performed by X-ray diffraction, and electron microscopy. The analysis revealed unexpected preferred orientation also in the MgO secondary phase due to the epitaxial growth of(111) MgO on(001) MgB_(2). The influence of oriented microstructure on the superconducting characteristics expressed by critical current density(J_(c)), irreversibility field(H_(irr)), and on the pinning properties were assessed. High anisotropy versus sample orientation in applied magnetic field, H, was observed for J_(c), Hirr, pinning activation energy(U^(*))extracted from relaxation measurements. The zero-field critical current, J_(c0)and F_(p),maxare weakly or not dependent on the direction of H,while the other indicated parameters are significantly influenced. Results enable control of superconducting parameters by further optimization of microstructure through MgB_(2) texturing as a novel and viable strategy for development of bulk MgB2with enhanced properties when taking advantage of its anisotropy.

关键词： Textured MgB_(2)bulk Slip casting Spark plasma sintering Critical current density Pinning force Pinning activation energy

Neuroinflammation and comorbidities are frequently ignored factors in CNS pathology

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2015年第9期10卷 1349-1355页

作者： Raluca Elena sandu Ana Maria Buga Adriana Uzoni Eugen Bogdan Petcu Aurel Popa-Wagner Center of Clinical and Experimental Research University of Medicine and Pharmacy Craiova Department of Psychiatry University of Medicine Rostock Biochemistry Department University of Medicine and Pharmacy "Victor Babes" Timisoara Griffith University School of Medicine Regenerative Medicine Centre

Virtually all drug interventions that have been successful pre-clinically in experimental stroke have failed to prove their efficacy in a dinical setting. This could be partly explained by the complexity and heterogeneity of human diseases as well as the associated co-morbidities which may render neuroprotective drugs less efficacious in dinical practice. One aspect of crucial importance in the physiopathology of stroke which is not completely understood is neuroinflammation. At the pres- ent time, it is becoming evident that subtle, but continuous neuroinflammation can provide the ground for disorders such as cerebral small vessel disease. Moreover, advanced aging and a number of highly prevalent risk factors such as obesity, hypertension, diabetes and atherosclerosis could act as ＂silent contributors＂ promoting a chronic proinflammatory state. This could aggravate the out- come of various pathological entities and can contribute to a number of subsequent post-stroke complications such as dementia, depression and neurodegeneration creating a pathological vicious cycle. Moreover, recent data suggests that the inflammatory process might be dosely linked with multiple neurodegenerative pathways related to depression. In addition, pro-inflammatory cyto- kines could play a central role in the pathophysiology of both depression and dementia.

关键词： aging stroke neuroinflammation comorbidities depression dementia

Could there be an interplay between periodontal changes and pancreatic malignancies?

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2023年第3期11卷 545-555页

作者： Bogdan Silviu Ungureanu Dorin Nicolae Gheorghe Flavia Mirela Nicolae sandu Ramboiu Petru Adrian Radu Valeriu MarinȘurlin Victor Dan Eugen Strambu Dan Ionut Gheonea Alexandra Roman PetraȘurlin Department of Gastroenterology University of Medicine and Pharmacy of CraiovaCraiova 200349Romania Department of Periodontology Research Center of Periodontal-Systemic ImplicationsUniversity of Medicine and Pharmacy of CraiovaCraiova 200349Romania Department 1st of Surgery University of Medicine and Pharmacy of CraiovaCraiova 200349Romania Department of General Surgery “Carol Davila”University of Medicine and PharmacyBucharest 020021Romania Department of Periodontology "Iuliu Hațieganu"University of Medicine and PharmacyCluj-Napoca 400012Romania

The term"periodontal disease"refers to a group of chronic inflammatory illnesses caused by specific microorganisms from subgingival biofilm,that affect the toothsupporting *** research has also shown that periodontal infection plays a role in aggravating systemic disease states at distal sites,reinforcing the significance of the oral cavity for general ***,it has been suggested that gastroenterological malignancies may be promoted by hematogenous,enteral or lymphatic translocation of *** the past 25 years,the global burden of pancreatic cancer(PC)has more than doubled,making it one of the major causes of cancer-related *** has been linked to at least 50%increased risk of PC and it could be considered a risk factor for this malignancy.A recent study performed on 59000 African American women with a follow up of 21 years showed that participants who had poor dental health had higher chances of *** findings,according to researchers,might be related to the inflammation that some oral bacteria *** the mortality of PC,periodontitis considerably raises the chance of dying from *** alterations in the gut,oral cavity and pancreatic tissues of PC patients occur when compared to healthy flora,demonstrating a link between PC and *** may also contribute to PC development,although the underlying pathway is not yet *** function of the microbiome in PC risk has drawn more focus over the last *** risk of PC has been linked to the oral microbiome,specifically increased levels of Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans and decreased relative abundance of Leptotrichia and Fusobacteria,suggesting that it may have an impact on the inflammatory condition by expanding,altering,and regulating the commensal *** who received periodontal treatment had significantly decreased incidence rate ratios for *** analyzing patterns in

关键词： Periodontal disease Pancreatic cancer Microbiome Periodontitis Periopathogens Periodontal medicine