检索结果-南通市图书馆

Second-order phase correction of NMR spectra acquired using linear frequency-sweeps

在线全文

学校读者我要写书评

暂无评论

Magnetic Resonance Letters 2022年第1期2卷 1-8,I0002页

作者： Zhehong Gan ivan Hung National High Magnetic Field Laboratory 1800 East Paul Dirac DriveTallahasseeFL32310USA

NMR spectra acquired with experiments using frequency-sweeps such as the wide-band uniform-rate smooth truncation(WURST)spin-echo and Carr-Purcell-Meiboom-Gill(CPMG)sequences cannot be absorptively phased by using only conventional zerothand first-order phase *** of phase correction up to the secondorder is described for obtaining absorptive spectra,which have more desirable line shapes and noise properties than magnitude *** relationship of the second-order phase to the parameters of frequency sweeps is *** second-order phasing in the frequency-domain is equivalent to a point spread in the time-domain *** application of second-order phase correction is demonstrated with a wideline 35Cl CPMG spikelet spectrum.

关键词： Second-order phase Noise Line shape Absorptive Dispersive Frequency sweep CHIRP WURST Adiabatic Broadband CPMG Spin-echo Wideline ^(35)Cl

Resveratrol as an Anti-inflammatory Agent in Coronary Artery Disease:A Systematic Review,Meta-Analysis and Meta-Regression

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2024年第10期30卷 927-937页

作者： Vito A.Damay Ignatius ivan Department of Cardiovascular Medicine Universitas Pelita HarapanTangerangBanten15811Indonesia Jakarta Varices Clinic Jakarta12210Indonesia

Background:Resveratrol is a non-flavonoid polyphenol that shows promise in reducing proinflammatory factors and maintaining endothelial function,which hints at its potential role in slowing atherosclerosis and preventing acute coronary ***:To study the cardioprotective effects of resveratrol on inflammatory mediators and endothelial function in patients with coronary artery disease(CAD).Methods:A thorough search was conducted in databases(Cochrane Library,Pro Quest,Pub Med,LILACS,Science Direct,Springer,Taylor&Francis,CNKI,Wanfang,and Weipu)until September 24,*** vasopro-inflammatory mediators,endothelial function and outcomes related to cardiovascular events were *** and abstracts were assessed,and bias was evaluated with Cochrane Ro B *** of results was explored by metaregression,certainty of evidence was assessed by the GRADE system,and conclusive evidence was enhanced by trial sequence ***:Ten randomized controlled trials and 3 animal studies investigated resveratrol's impact on inflammatory mediators and endothelial *** primary prevention studies,meta-analysis showed a significant reduction(95%CI:–0.73 to–0.20;P=0.0005)in tumor necrosis factor-α(TNF-α)expression with resveratrol,demonstrating a dose-dependent *** significant difference was observed in interleukin-6(IL-6)expression with P=0.58 for primary prevention and P=0.57 for secondary *** endothelial nitric oxide synthase(e NOS)expression was significantly increased after resveratrol pre-treatment following CAD *** prevention studies yielded no significant results;however,meta-regression identified associations between age,hypertension,and lower doses with the extent of TNF-α*** certainty of evidence supported TNF-αreduction,while evidence for IL-6 reduction and e NOS elevation was deemed ***:Resveratrol reduces TNF-αin individuals at risk for CAD,specifically 15 mg per ***

关键词： anti-inflammation coronary artery disease nitric oxide resveratrol systematic review

Degenerations of Jordan Algebras and“Marginal”Algebras

在线全文

学校读者我要写书评

暂无评论

Algebra Colloquium 2021年第2期28卷 281-294页

作者： Ilya Gorshkov ivan Kaygorodov Yury Popov Sobolev Institute of Mathematics NovosibirskRussia Universidade Federal do ABC CMCCSanto AndreBrazil Universidade Estadual de Campinas CampinasBrazil

We describe all degenerations of the variety ■3 of Jordan algebras of dimension three over *** particular,we describe all irreducible components in ■*** every n we define an n-dimensional rigid“marginal”Jordan algebra of level ***,we discuss marginal algebras in associative,alternative,left alternative,non-commutative Jordan,Leibniz and anticommutative cases.

关键词： Jordan algebra degeneration rigid algebra irreducible component marginal algebra

Analysis of recent Antarctic plate kinematics based on GNSS data

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geodesy and Geodynamics 2023年第2期14卷 99-110页

作者： Ihor Savchyn ivan Brusak Korneliy Tretyak Lviv Polytechnic National University Institute of GeodesyUkraine

The research aims to study recent Antarctic plate kinematics based on Global Navigation Satellite System(GNSS)*** research covers 60 continuous GNSS stations located on the Antarctic plate during *** determine the components of horizontal displacement vectors of these GNSS stations and construct the schematic map of their *** results indicate that the direction of velocity vectors of horizontal displacements has a rotational nature in clockwise *** analysis of deformation processes shows that a gradual decrease in the horizontal strain rates,maximum shear strain and area strain is taking place from west to east,in the direction of West Antarctica-the Transantarctic Mountains-East *** absolute rotation pole of the Antarctic plate in the ITRF2014/IGS14 reference frame has been determined,and the obtained values are in good agreement with recent plate models.

关键词： Continuous GNSS station Horizontal velocity Strain rates Rotation pole The Antarctic plate

Cytokinin levels and signaling respond to wounding and the perception of herbivore elicitors in Nicotiana attenuata

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Plant Biology 2015年第2期57卷 198-212页

作者： martin Sch?fer ivan D. Meza-Canales Aura Navarro-Quezada Christoph Brütting Radomira Vanková Ian T. Baldwin Stefan Meldau Department of Molecular Ecology Max Planck Institute for Chemical Ecology Laboratory of Hormonal Regulations in Plants Institute of Experimental Botany AS CR German Centre for integrative Biodiversity Research (i Div)

Nearly half a century ago insect herbivores were found to induce the formation of green islands by manipulating cytokinin （CK） levels. However, the response of the CK pathway to attack by chewing insect herbivores remains unclear. Here, we characterize the CK pathway of Nicotiana attenuata （Torr. ex S. Wats.） and its response to wounding and perception of herbivoreassociated molecular patterns （HAMPs）. We identified 44 genes involved in CK biosynthesis, inactivation, degradation, and signaling. Leaf wounding rapidly induced transcriptional changes in multiple genes throughout the pathway, as well as in the levels of CKs, including isopentenyladenosine and cis-zeatin riboside; perception of HAMPs present in the oral secretions （OS） of the specialist herbivore Manduca sexta amplified these responses. The jasmonate pathway, which triggers many herbivore-induced processes, was not required for these HAMP-triggered changes, but rather suppressed the CK responses. Interestingly CK pathway changes were observed also in systemic leaves in response to wounding and OS application indicating a role of CKs in mediating long distance systemic processes in response to herbivory. Since wounding and grasshopper OS elicited similar accumulations of CKs in Arabidopsis thaliana L., we propose that CKs are integral components of wounding and HAMP-triggered responses in many plant species.

关键词： Arabidopsis thaliana cytokinin herbivore-associated molecular patterns herbivory insect jasmonic acid Manduca sexta Nicotiana attenuata wounding

On the Modeling of Non-Classical Problems Involving Liquid Jets and Films and Related Heat Transfer Processes

在线全文

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2019年第5期15卷 491-507页

作者： ivan V.Kazachkov Division of Information Technology and Data Analysis Nizhyn Gogol State UniversityNizhyn16600Ukraine Division of Heat and Power Royal Institute of TechnologyBrinellvägen 6810044StockholmSweden

Non-classical subjects relating to the dynamics of jet and film flow and related heat transfer processes are *** problems,which are relevant to several technological applications,cannot completely be addressed in the frame of the canonical Navier-Stokes *** first example deals with the formation of a film flow as a result of the hydraulic shock of a vertical jet impinging on a horizontal *** effective thickness of the film resulting from the hydraulic shock is much less than the value obtained using the conventional approach(relying on the assumption of smooth flow),while the corresponding speed is much *** next case is a jet penetrating into a pool of another liquid,which under certain conditions can form a jet head of a fungoid *** the jet penetrates the pool,it expands sharply,and this situation is another example of circumstances where classical models are ***,by virtue of the intense radiating heat transfer taking place at the front of the jet,a high-temperature jet can penetrate a pool of evaporating coolant,like a“jet in a bag of steam”.These exotic problems are modeled and explained in the present article along with experimental data used for model *** new hydrodynamic phenomena discovered over recent years are presented together with their practical applications,in particular,the modes of soliton-like and shock-wave decay of jets during vibration and electromagnetic resonant decomposition of the jet into droplets of a given *** phenomena are relevant to the areas of granulation of metal melts,cooling of molten corium during postulated severe accidents in nuclear power plants and in other industrial and technological devices and processes.

关键词： Jet film thickness flow hydraulic shock penetration pool vapor mushroom

Thermoelectric and electrical characteristics of SmS ceramic samples after exposure to a pulsed magnetic field

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 Rare Earths 2022年第11期40卷 1778-1784,I0004页

作者： ivan Volchkov Evgeniy Baskakov Vladimir Strelov Vladimir Kanevskii FSRC"Crystallography and Photonics"RAS Leninskiy Prospekt 59119333MoscowRussia

Samarium monosulfide(SmS)is a promising material for creating thermoelectric generators(TEG),gas sensors and strain *** the high values of the generated thermo electromotive force(TEMF)(α≈170-350μV/K),methods for increasing the efficiency of TEGs based on SmS are of considerable *** of these methods can be short-term effects of magnetic fields,including pulsed ones,on these *** action of a pulsed magnetic field(PMF)leading to an increase in TEMF(U)of SmS ceramic samples is *** that are not subjected to high frequency currents(HFC)annealing show an increase in UT of 44.54%-62.18%(from 11.9 to 17.2-19.3 mV).The conductivity(σ)of the samples is~22 Q/cm and is insensitive to short-term exposure to a *** that undergo HFC annealing show an increase in Uof 23.47%-41.31%(from 21.3 to 26.3-30.1 mV)after exposure to a *** conductivity of the samples is~15Ω^(-1)/cm and after a short exposure to the PMF is changing nonmo notonically,with an increase in the overall *** difference in the values of Uand a can be explained by presence of an ordered grain structure and a significant amount of the Sm_(2)O_(2)S phase in the samples subjected to HFC *** mechanisms of the observed changes are discussed.

关键词： Rare earths Thermoelectric Electric properties Magnetically induced changes Samarium monosulfide

Phase preservation of orbital angular momentum of light in multiple scattering environment

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2024年第10期13卷 2263-2275页

作者： Igor Meglinski ivan Lopushenko Anton Sdobnov Alexander Bykov College of Engineering and Physical Sciences Aston UniversityBirmingham B47ETUK Optoelectronics and Measurement Techniques University of OuluOulu FI-90014Finland

Recent advancements in wavefront shaping techniques have facilitated the study of complex structured light’s propagation with orbital angular momentum(OAM)within various *** introduction of spiral phase modulation to the Laguerre–Gaussian(LG)beam during its paraxial propagation is facilitated by the negative gradient of the medium’s refractive index change over time,leading to a notable increase in the rate of phase twist,effectively observed as phase retardation of the *** approach attains remarkable sensitivity to even the slightest variations in the medium’s refractive index(∼10−6).The phase memory of OAM is revealed as the ability of twisted light to preserve the initial helical phase even propagating through the turbid tissue-like multiple scattering *** results confirm fascinating opportunities for exploiting OAM light in biomedical applications,*** as non-invasive trans-cutaneous glucose diagnosis and optical communication through biological tissues and other optically dense media.

关键词： scattering momentum light

Applying the Shearlet-Based Complexity Measure for Analyzing Mass Transfer in Continuous-Flow Microchannels

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第8期20卷 1743-1758页

作者： Elena Mosheva ivan Krasnyakov Institute of Continuous Media Mechanics UB RAS Perm614013Russia Department of Applied Physics Perm National Research Polytechnic UniversityPerm614990Russia

Continuous-flow microchannels are widely employed for synthesizing various materials,including nanoparticles,polymers,and metal-organic frameworks(MOFs),to name a *** technology allows precise control over reaction parameters,resulting in purer,more uniform,and structurally stable products due to more effective mass transfer ***,continuous-flow synthesis processes may be accompanied by the emergence of spatial convective structures initiating convective *** the one hand,convection can accelerate reactions by intensifying mass *** the other hand,it may lead to non-uniformity in the final product or defects,especially in MOF microcrystal *** ability to distinguish regions of convective and diffusive mass transfer may be the key to performing higher-quality reactions and obtaining purer *** this study,we investigate,for the first time,the possibility of using the information complexity measure as a criterion for assessing the intensity of mass transfer in microchannels,considering both spatial and temporal non-uniformities of liquid’s distributions resulting from convection *** calculate the complexity using shearlet transform based on a local *** contrast to existing methods for calculating complexity,the shearlet transform based approach provides a more detailed representation of local *** analysis involves experimental images illustrating the mixing process of two non-reactive liquids in a Y-type continuous-flow microchannel under conditions of double-diffusive convection *** obtained complexity fields characterize the mixing process and structure formation,revealing variations in mass transfer intensity along the *** compare the results with cases of liquid mixing via a pure diffusive *** analysis,it was revealed that the complexity measure exhibits sensitivity to variations in the type of mass transfer,establishing its feasibility as an ind

关键词： Shearlet analysis complexity measure entropy measure convection microchannels double-diffusive instability