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Ion Heating from Nonlinear Landau Damping of High Mode Number toroidal Alfvén Eigenmodes

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Plasma science and technology 2015年第7期17卷 534-538页

作者： t.s.HAHM Department of Nuclear Engineering Seoul National University

Bulk ion heating rate from nonlinear Landau damping of high mode number toroidal Alfven Eigenmodes （tAEs） is calculated in the frame work of weak turbulence theory. the heating rate is lower than the nonlinear spect... 详细信息

关键词： Alfven wave nonlinear Landau damping toroidal Alfven eigenmode

INtERNAL FRICtION OF 51CrV4 sHAFt INFLUENCED BY tHERMO-MECHANICAL COUPLINg

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Acta Metallurgica sinica(English Letters) 2008年第2期21卷 79-84页

作者： J.gken M.Maikranz-Valentin K.steinhoff t.s.Pavlova t.V.Ivleva I.s.golovin Chair of Metal Forming technology University of Kassel KasselGermany Physics of Metals and Materials science Department tula state University TulaRussia

the simultaneous influence of thermal and mechanical treatment was applied to produce a geometrically complex shaft from 51CrV4 steel leading to the formation of mierostruetures which were significantly different from each other. these mierostrue- rural differences were accompanied by a local change of mechanical properties in terms of hardness, electrical resistivity and especially internal friction. the snoek-Ksster peak was recognized and analyzed in the structure of this steel.

关键词： 51CRV4 steel Functionally graded material (FgM) Internalfriction snoek- Ksster peak

Vagus nerve stimulation in intracerebral hemorrhage:the need for further research

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Neural Regeneration Research 2025年第11期20卷 3213-3214页

作者： sheharyar s.Baig Ali N.Ali Arshad Majid sheffield Institute for translational Neuroscience Division of NeuroscienceThe University of SheffieldSheffieldUK

Vagus nerve stimulation(VNs)and stroke:stroke is the second leading cause of death and the third leading cause of disability worldwide(Baig et al.,2023).there have been significant paradigm shifts in the management of acute ischemic stroke through mechanical *** chronic ischemic stroke,invasive VNs paired with rehabilitation is associated with a significant increase in upper limb motor recovery and is FDA-approved(Baig et al.,2023).there are no treatments of similar efficacy in acute intracerebral hemorrhage(ICH)where several promising trials,e.g.,tICH-2,stOP-AUst,and tRAIgE did not show improvements in functional outcomes(Puy et al.,2023).

关键词： stimulation acute

Uniform and L-convergence of Logarithmic Means of Walsh-Fourier series

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Acta Mathematica sinica,English series 2006年第2期22卷 497-506页

作者： g.gát U.gOgINAVA Institute of Mathematics and Computer science College of Nyiregyhaza Department of Mechanics and Mathematics Tbilisi State University

the （Nsrlund） logarithmic means of the Fourier series of the integrable function f is：1/lnn-1∑k=1sk（f）/n-k, where ln：=n-1∑k=11/k.In this paper we discuss some convergence and divergence properties of this logarithmic means of the Walsh-Fourier series of functions in the uniform, and in the L^1 Lebesgue norm. Among others, as an application of our divergence results we give a negative answer to a question of Móricz concerning the convergence of logarithmic means in norm.

关键词： Walsh system Norlund logarithmic means Convergence divergence properties

Matrix Crack Detection by an Embedded Polarimetric sensor

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Journal of Materials science & technology 2006年第2期22卷 220-224页

作者： H. Wang s.L. Ogin A.M. thorne g. t.Reed school-of Engineering University of Surrey Guildford Surrey GU2 5XH UK school of Electronic Engineering Information and Mathematics University of Surrey Guildford Surrey GU2 5XH UK

Polarimetric optical fibre sensors have been embedded within the 0° ply and close to the 0/90 interface of transparent cross-ply gFRP coupons. the laminate ply cracks may initiate and propagate across the coupon when the coupons were subjected to an increasing quasi-static load in a servo-hydraulic testing machine. Crack accumulation have been monitored using a long gauge-length extensometer. the response of the strain signal, the optical signal and the load signal to cracks at different positions in the coupon in relation to the extensometer and optical sensor positions have been acquired and compared by means of video images of the crack growth. the relationship between crack growth and sensor response was demonstrated. the displacement induced by a new transverse crack has been predicted and compared with experimental data.

关键词： Matrix cracking Polarimetric sensor Fourier analysis

geochemical assessment of a siliceous limestone sample for cement making

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Chinese Journal Of geochemistry 2011年第1期30卷 33-39页

作者： Rao D.s. Vijayakumar t.V. Prabhakar s. Bhaskar Raju g. National Metallurgical Laboratory-Madras Centre CsIR Madras Complex Taramani Chennai-600 113 India

A low grade siliceous limestone sample from the Jayantipuram mine of Andhra Pradesh, India, has been investigated for its suitability for cement making. Petrological as well as X-ray diffraction pattern studies indicated that the limestone sample was crystalline and dominantly composed of calcite and quartz. they are simple in mineralogy, and yet they have variable silica and lime contents. geochemical analysis results of twenty five hand picked samples indicated that the limestone from the Jayantipuram mine shows a wide range of variations in LOI (29.94% to 40.64%), siO2 (6.14% to 27.18%), CaO (37.93% to 50.78%), Al2O3 (0.49% to 2.27%) and Fe2O3 (0.28% to 2.4%). MgO, K2O, Na2O, tiO2 and MnO2 are present in traces. CaO with LOI shows a strong positive correlation where as CaO with siO2 shows a strong negative correlation because of mineralogical factors. the chemical composition of the limestone reflects its mineralogical composition. the distribution of various elements in the acid-soluble fraction has been studied by the factor analysis method in order to interpret in terms of their mineralogy, sedimentary environment and diagenesis. Mineralogy, recrystallization and other diagenetic changes are the main factors affecting the distribution of the elements and their mutual relationships in the limestone. the aim of this paper is also to analyze how significantly the two parameters, silica modulus and lime saturation factor, influence this low grade siliceous limestone sample from the Jayantipuram mine of Andhra Pradesh, India, for the cement making process from the geochemical data.

关键词：灰岩样品水泥生产地球化学硅质石灰石矿评估因子分析方法化学数据处理

Chemical-structural Changes of Organic Matter in a semi-Arid soil After Organic Amendment

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Pedosphere 2012年第3期22卷 283-293页

作者： C.NICOLs g.MAsCIANDARO t.HERNNDEZ C.gARCIA Centro de Edafología y Biología Aplicada del segura (CEBAs-CsIC) Department of Soil and Water Conservation and Organic Wastes ManagementCampus Universitario de EspinardoP.O.160Murcia 3010 (Spain) Consiglio Nazionale delle Ricerche (CNR) Istituto per lo Studio degli Ecosistemi (ISE)-Sezione di Chimica del SuoloArea della RicercaVia Moruzzi 1Pisa 56124 (Italy)

A 9-month incubation experiment using composted and non-composted amendments derived from vine pruning waste and sewage sludge was carried out to study the effects of the nature and stability of organic amendments on the structural composition of organic matter (OM) in a semi-arid *** changes of soil OM,both in the whole soil and in the extractable carbon with pyrophosphate,were evaluated by pyrolysis-gas chromatography and chemical *** the end of the experiment,the soils amended with pruning waste exhibited less organic carbon loss than those receiving sewage *** non-composted residues increased the aliphatic-pyrolytic products of the OM,both in the whole soil and also in the pyrophosphate extract,with the products derived from peptides and proteins being significantly *** 9 months,in the soils amended with pruning waste the relative abundance of phenolic-pyrolytic products derived from phenolic compounds,lignin and proteins in the whole soil tended to increase more than those in the soils amended with sewage ***,the extractable OM with pyrophosphate in the soils amended with composted residues tended to have higher contents of these phenolic-pyrolytic products than that in non-composted ***,despite the stability of pruning waste,the composting of this material promoted the incorporation of phenolic compounds to the soil *** pyrolytic indices (furfural/pyrrole and aliphatic/aromatic ratios) showed the diminution of aliphatic compounds and the increase of aromatic compounds,indicating the stabilization of the OM in the amended soils after 9 *** conclusion,the changes of soil OM depend on the nature and stability of the organic amendments,with composted vine pruning waste favouring humification.

关键词： degraded soil pyrolysis-gas chromatography pyrophosphate extract sewage sludge vine pruning waste

Optical and electrical properties and phonon drag effect in low temperature tEP measurements of Agsbse_2 thin films

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Journal of semiconductors 2014年第5期35卷 1-6页

作者： t Namitha Asokan K s Urmila Rajani Jacob Rachel Reena Philip g s Okram V ganesan B Pradeep solid state Physics Laboratory Department of Physics Cochin University of Science and Technology thin Film Research Lab Department of Physics Union Christian College UgC-DAE Consortium for scientific Research

Polycrystalline thin films of silver antimony selenide have been deposited using a reactive evaporation technique onto an ultrasonically cleaned glass substrate at a vacuum of 10-5 torr. the preparative parameters, like substrate temperature and incident fluxes, have been properly controlled in order to get stoichiometric, good quality and reproducible thin film samples. the samples are characterized by XRD, sEM, AFM and a UV-vis-NIR spectrophotometer. the prepared sample is found to be polycrystalline in nature. From the XRD pattern, the average particle size and lattice constant are calculated. the dislocation density, strain and number of crystallites per unit area are evaluated using the average particle size. the dependence of the electrical conductivity on the temperature has also been studied and the prepared Agsbse2 samples are semiconducting in nature. the Agsbse2 thin films exhibited an indirect allowed optical transition with a band gap of 0.64 eV. the compound exhibits promising thermoelectric properties, a large seebeck coefficient of 30 mV/K at 48 K due to strong phonon electron interaction. It shows a strong temperature dependence on thermoelectric properties, including the inversion of a dominant carrier type from p to n over a low temperature range 9-300 K, which is explained on the basis of a phonon drag effect.

关键词： silver antimony selenide reactive evaporation thermoelectric power phonon drag effect

VCsEL wavelength reuse for intrinsically bidirectional data traffics in next generation gPONs

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Optoelectronics Letters 2019年第5期15卷 360-362页

作者： g.M.Isoe s.Wassin t.B.gibbon Centre for Broadband Communication Nelson Mandela University

An all-optical wavelength reuse technique employing cost effective power efficient vertical surface emitting laser(VCsEL) is proposed to address uplink data streaming from end-users by exploiting the same wavelength assigned to them. A saturated optical erbium-doped optical fiber amplifier(EDFA) is adopted to erase a directly modulated 10 gbit/s data from an incoming downstream wavelength. We show that with EDFA saturation, the extinction ration of the incoming wavelength is reduced to less than 1 d Bm, therefore allowing for wavelength re-modulation. A receiver sensitivity of -19.65 d Bm and -17.86 d Bm is attained for downstream and upstream data signals respectively. A total of 24.7 km single mode fibre transmission is attained experimentally. this technique opens new perspectives towards development of efficient spectrum utilization for application in wavelength flexible optical networks with non-static flex-spectrum grids.

关键词： VCsEL erbium-doped optical fiber amplifier(EDFA) intrinsically bidirectional