检索结果-南通市图书馆

Mutual Authentication protocols for RFID Systems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2008年第4期5卷 348-365页

作者： Ashrar A.Omer Johnson p.thomas Department of Computer Science Oklahoma State University

With the availability of low-cost radio frequency identification (RFID) tags,security becomes an increasing concern. However,such tags do not permit complex cryptographic functions due to their computational,communications,and storage limitations. In this paper,we investigate the security issues and requirements of RFID systems,and propose ultra-light weight and light weight protocols for low-cost RFID *** proposed protocols has been applied to a supply chain management system.

关键词： Security mutual authentication supply chain management RFID Systems.

Tuning beneficial calcineurin phosphatase activation to counterα-synuclein toxicity in a yeast model of parkinson’s disease

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第1期20卷 199-200页

作者： Srishti Chawla Mikael Molin thomas Nystrom Institute for Biomedicine Sahlgrenska AcademyCentre for Ageing and Health-AgeCapUniversity of GothenburgGothenburgSweden Department of Life Sciences Chalmers University of TechnologyGothenburgSweden

Calcineurin(CN)is a calcium-and calmodulindependent serine/threonine that has been studied in many model organisms including yeast,filamentous fungi,plants,and *** biological functions range from ion homeostasis and virulence in lower eukaryotes to T-cell activation in humans by human nuclear factors of activated *** is a heterodimeric protein consisting of a catalytic subunit,calcineurin A(Cna1p),which contains an active site with a dinuclear metal center,and a regulatory Ca^(2+) binding subunit called calcineurin B(Cnb1p)required to activate *** calcineurin B subunit has been highly conserved through evolution:For example,the mammalian calcineurin B shows 54%identity with calcineurin B from Saccharomyces cerevisiae.

关键词： activation dinuclear conserved

Effect of Sr_(2) TiMnO_(6) fillers on mechanical, dielectric and thermal behaviour of pMMA polymer

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2015年第3期5卷 1-11页

作者： p.thomas B.S.Dakshayini H.S.Kushwaha Rahul Vaish Dielectric Materials Division Central Power Research Institute BangaloreKarnataka 560080India Aerospace Engineering Indian Institute of Science BangaloreKarnataka 560012India School of Engineering Indian Institute of Technology Mandi Himachal Pradesh 175001India

Composites of poly(methyl methacrylate)(pMMA)and Sr_(2) TiMnO_(6)(STMO)were fabricated via melt mixing followed by hot pressing *** were characterized using X-ray diffraction(XRD),thermo gravimetric analysis(TGA),differential scanning calorimetry(DSC),thermo mechanical analysis(TMA)and impedance analyser for their structural,thermal and dielectric *** coefficient of thermal expansion(CTE)was measured between 40℃ and 100℃ for pure pMMA is 115.2ppm/℃,which was decreased to 78.58ppm/℃ when the STMO content was increased to 50 wt.%in *** was no difference in the glass transition(T g)temperature of the pMMA polymer and their ***,the FTIR analysis indicated possible interaction between the pMMA and *** density and the hardness were increased as the STMO content increased in the pMMA *** was found to be as high as 30.9 at 100Hz for the pMMAþSTMO-50 wt.%composites,indicating the possibility of using these materials for capacitor *** thermal stability of polymer was enhanced by incorporation of STMO fillers.

关键词： polymer composite dielectric properties mechanical properties thermal properties

RADIATION BOUNDARY CONDITIONS FOR MAXWELL'S EQUATIONS:A REVIEW OF ACCURATE TIME-DOMAIN FORMULATIONS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computational Mathematics 2007年第3期25卷 305-336页

作者： thomas Hagstrom stephen Lau Department of Mathematics and Statistics University of New MexicoAlbuquerqueNM 87131USA Division of Applied Mathematics Brown University182 George StreetProvidenceRI 02912USA

We review time-domain formulations of radiation boundary conditions for Maxwell＇s equations, focusing on methods which can deliver arbitrary accuracy at acceptable compu-tational cost. Examples include fast evaluations of nonlocal conditions on symmetric and general boundaries, methods based on identifying and evaluating equivalent sources, and local approximations such as the perfectly matched layer and sequences of local boundary conditions. Complexity estimates are derived to assess work and storage requirements as a function of wavelength and simulation time.

关键词： Maxwell's equations Radiation boundary conditions Fast algorithms Kirchoffformulas perfectly matched layers.

pulmonary vein activation in atrial fibrillation and sinus rhythm

在线全文

学校读者我要写书评

暂无评论

Pulmonary vein activation in atrial fibrillation and sinus r...

Effect of TeO_(2) addition on the dielectric properties of CaCu_(3)Ti_(4)O_(12) ceramics derived from the oxalate precursor route

2006年浙江省心血管病学学术年会

作者： Stuart p.thomas Department of Cardiology and University of Sydney Westmead HospitalSydneyN.S.W2145Australia M.D. Ph.D.

AIMS The purpose of this study was to determine the relationship between pulmonary vein (pV) electrical activation during atrial fibrillation (AF) and after cardioversion into sinus rhythm. Methods and Results Electrograms were recorded using a circular mapping catheter during AF and after cardioversion in 53 pVs from 41 patients. Two activation patterns were observed in atrial fibrillation. Group 1 had fixed consistent uniform activation sequences most (>70%) of the recording time. Group 2 had no fixed activation sequence. In Group 1 a constant single activation sequence pattern was seen in 22 pVs (Group

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2013年第4期3卷 26-33页

作者： p.thomas K.B.R.Varma Dielectric Materials Division Central Power Research Institute Bangalore 560080India Materials Research Centre Indian Institute of Science Bangalore 560012India

CaCu_(3)Ti_(4)O_(12)(CCTO)ceramics which has perovskite structure gained considerable attention due to its giant *** it has high tan(0.1 at 1 kHz)at room temperature,which needs to be minimized to the level of practical ***,TeO_(2) which is a good glass former has been deliberately added to CCTO nanoceramic(derived from the oxalate precursor route)to explore the possibility of reducing the dielectric loss while maintaining the high *** structural,morphological and dielectric properties of the pure CCTO and TeO_(2) added ceramics were studied using X-ray diffraction,Scanning Electron Microscope along with Energy Dispersive X-ray Analysis(EDX),spectroscopy and Impedance *** the 2.0 wt.%TeO_(2) added ceramics,there is a remarkable difference in the microstructural features as compared to that of pure CCTO *** sample exhibited permittivity values as high as 7387 at 10 KHz and low dielectric loss value of 0.037 at 10 kHz,which can be exploited for the high frequency capacitors application.

关键词： Dielectric TeO_(2) CaCu_(3)Ti_(4)O_(12) ceramic

Microglia:a promising therapeutic target in spinal cord injury

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第2期20卷 454-463页

作者： Xiaowei Zha Guoli Zheng thomas Skutella Karl Kiening Andreas Unterberg Alexander Younsi Department of Neurosurgery Heidelberg University HospitalHeidelbergGermany Department of Neuroanatomy Institute for Anatomy and Cell BiologyHeidelberg UniversityHeidelbergGermany

Microglia are present throughout the central nervous system and are vital in neural repair,nutrition,phagocytosis,immunological regulation,and maintaining neuronal *** a healthy spinal cord,microglia are accountable for immune surveillance,however,when a spinal cord injury occurs,the microenvironment drastically changes,leading to glial scars and failed axonal *** this context,microglia vary their gene and protein expression during activation,and proliferation in reaction to the injury,influencing injury responses both favorably and unfavorably.A dynamic and multifaceted injury response is mediated by microglia,which interact directly with neurons,astrocytes,oligodendrocytes,and neural stem/progenitor *** a clear understanding of their essential nature and origin,the mechanisms of action and new functions of microglia in spinal cord injury require extensive *** review summarizes current studies on microglial genesis,physiological function,and pathological state,highlights their crucial roles in spinal cord injury,and proposes microglia as a therapeutic target.

关键词： astrocytes cytokines functional recovery immune regulation M1/M2 activation macrophages microglia neuroinflammation spinal cord injury therapy

STRUCTURAL AND DIELECTRIC pROpERTIES OF GLASSES IN THE SYSTEM TeO_(2)-CaCu_(3)Ti_(4)O_(12)

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2012年第4期2卷 47-54页

作者： p.thomas K.B.R.VARMA Dielectric Materials Division Central power Research Institute Bangalore 560080India Materials Research Centre Indian Institute of Science Bangalore 560012India

The glasses in the system(100-x)TeO_(2)-xCaCu_(3)Ti_(4)O_(12),(x=0.25 mol.%to 3 mol.%)were *** color varied from olive green to brown as the CaCu_(3)Ti_(4)O_(12)(CCTO)content increased in TeO_(2) *** X-ray powder diffraction and differential scanning calorimetric analyses that were carried out on the as-quenched samples confirmed their amorphous and glassy nature *** dielectric constant and loss in the 100Hz1MHz frequency range were monitored as a function of temperature(50-400℃).The dielectric constant(ε′_(τ))and the loss(D)increased as the CCTO content increased in TeO_(2) at all the frequencies and temperatures under ***,the ε′_(τ) and D were found to be frequency-independent in the 50-200℃ temperature *** value obtained for the loss at 1MHz was 0.0019 which was typical of low loss materials,and exhibited near constant loss(NCL)in the 100Hz-1MHz frequency *** electrical relaxation was rationalized using the electric modulus *** glasses may be of considerable interest as substrates for high frequency circuit elements in conventional semiconductor industries owing to their high thermal stability.

关键词： Dielectric TeO_(2) CaCu_(3)Ti_(4)O_(12) glass

Sleep as a window to understand and regulate Alzheimer's disease:emerging roles of thalamic reticular nucleus

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第6期20卷 1711-1712页

作者： Haoqi Sun Shiqian Shen Robert J.thomas M.Brandon Westover Can Zhang Department of Neurology Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Center for Translational pain Research Department of AnesthesiaCritical Care and Pain MedicineMassachusetis General HospitalHarvard Medical SchoolBostonMAUSA Division of pulmonary Critical Care and Sleep MedicineDepartment of MedicineBeth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA Genetics and Aging Research Unit McCance Center for Brain HealthMass General Institute for Neurodegenerative DiseaseDepartment of NeurologyMassachusetts General HospitalHarvard Medical SchoolBostonMAUSA

Introduction:Alzheimer 's disease(AD) is a common neurodegenerative disorder and the primary cause of dementia. Considerable evidence supports the “amyloid hypothesis,” stating that the pathogenesis of AD is primarily caused by the deposition of amyloid-β(Aβ), which drives tau phosphorylation, neuroinflammation, and neurodegeneration in the brain. The amyloid hypothesis is strengthened by the significant and moderate benefit of lecanemab, a humanized antibody through an anti-amyloid mechanism,showing slowed clinical decline(van Dyck et al.,2023). The recent positive results of anti-amyloid trials have brought back focus on the amyloid hypothesis through biochemical, genetic, and pharmacological approaches(Zhang, 2023).

关键词： Alzheimer inflammation hypothesis