检索结果-南通市图书馆

High temperature dielectric properties of(B_(x)n_(y)O_(z))thin films deposited using ion source assisted physical vapor deposition

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Dielectrics 2015年第4期5卷 16-20页

作者： n.Badi Center for Advanced Materials University of Houston HoustonTexas 77204-5004USA Physics Department University of TabukP.O.Box 741 Tabuk 71491Saudi Arabia

The dielectric integrity has been one of the major obstacle in bringing out capacitor devices with suitable performance char-acteristics at high *** this paper,B_(x)n_(y)O_(z) dielectric films for high temperature capacitors solutions are *** films were grown on silicon substrate by using ion source assisted physical vapor deposition *** as-grown films were characterized by SEM,XRD,and *** capacitor structures were fabricated using B_(x)n_(y)O_(z) as a dielectric and titanium as metal *** elaborated devices were subjected to electrical and thermal *** exhibited low electrical loss and very good stability when subjected to high temperature for a prolonged period of time.

关键词： Boron oxynitride dielectric high temperature capacitor

Pitting and stress corrosion cracking studies on AISI type 316n stainless steel weldments

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

Defence Technology（防务技术） 2018年第3期14卷 226-237页

作者： Anita Toppo M.G.Pujar n.Sreevidya John Philip Corrosion Science and Technology Division Indira Gandhi Centre for Atomic Research Materials Development and Technology Division Indira Gandhi Centre for Atomic Research

Pitting and stress corrosion cracking(SCC) studies on the 316 n stainless steel(SS) weldments in aswelded(AW) and thermally aged(solution annealing(SA), 550C/4 h and 750C/1 h) conditions were carried out in acidic and acidic chloride media. Pitting corrosion and SCC resistance was the highest for SA weldment, which was attributed to homogenization of microstructural and microchemical heterogeneities during solution annealing. SA specimen showed the most stable passive film as compared to AW weldment because of higher amount of delta-ferrite in AW weld metal, which resulted in an increased heterogeneity and inferior SCC resistance in AW. Stability of passive film was found to be adversely affected due to heat treatments(at 550C/4 h and 750C/1 h) because of the precipitation of carbide and sigma phases.

关键词：压力腐蚀不锈钢 AISI 焊接金属 SCC 稳定性氯化物微结构

Z-scheme mechanism for methylene blue degradation over Fe_(2)O_(3)/g-C_(3)n_(4) nanocomposite prepared via one-pot exfoliation and magnetization of g-C_(3)n_(4)

在线全文

学校读者我要写书评

暂无评论

Frontiers of Materials Science 2022年第3期16卷 203-218页

作者： Shemeena MULLAKKATTUTHODI Vijayasree HARIDAS Sankaran SUGUnAn Binitha n.nARAYAnAn Department of Chemistry Sree Neelakanta Government Sanskrit College(Affiliated to University of Calicut)PattambiPalakkad 679306KeralaIndia Department of Applied Chemistry Cochin University of Science and TechnologyCochin 22KeralaIndia Department of Chemistry University of CalicutMalappuramKerala 673635India

The low surface area,high recombination rate of photogenerated charge carriers,narrow visible range activity,and difficulty in the separation from cleaned solutions limit the wide application of g-C_(3)n_(4) as a ***,we have succeeded in developing a one-pot strategy to overcome the above-mentioned difficulties of g-C_(3)n_(4).The broadening of the visible-light response range and inducing magnetic nature to g-C_(3)n_(4) was succeeded by preparing a nanocomposite with Fe_(2)O_(3) via a facile solvothermal *** preparation method additionally imparted layer exfoliation of g-C_(3)n_(4) as evident from the XRD patterns and TEM *** strong interaction between the components is revealed from the XPS *** broadened visible-light absorbance of Fe_(2)O_(3)/g-C_(3)n_(4) with a Z-scheme photocatalytic degradation mechanism is well evident from the UV-Vis DRS analysis and PL measurement of the composite with terephthalic *** active species of photocatalysis were further investigated using scavenging studies in methylene blue degradation that revealed hydroxyl radicals and holes as the major contributors to the activity of Fe_(2)O_(3)/g-C_(3)n_(4).

关键词： Fe_(2)O_(3)/g-C_(3)n_(4)nanocomposite Z-scheme photocatalysis magnetic separation dyedegradation

The Janus face of n-terminal lysines in α-synuclein

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2020年第10期15卷 1840-1841页

作者： Ana Belén Uceda Laura Mari?o Miquel Adrover Institut Universitari d’Investigació en Ciències de la Salut (IUnICS) Institut d’Investigació Sanitària Illes Balears (Id ISBa) Departament de Química Universitat de les Illes Balears

Parkinson’s disease(PD)is the second most prevalent progressive neurodegenerative disorder after Alzheimer’s *** usually starts with a tremor in the extremities(usually in the hands)and gradually evolves with other symptoms such as bradykinesia,muscle stiffness,impaired posture,loss of automatic movements or speech *** symptoms worsen as the condition progresses and eventually lead to death.

关键词： impaired Alzheimer eventually

Lower order three-dimensional Burgers equation having non-Maxwellian ions in dusty plasmas

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2017年第2期26卷 327-333页

作者： Apul n Dev Center for Applied Mathematics Siksha ‘O＇ Anusandhan University Khandagiri Bhubaneswar-751030 Odisha India

The dust acoustic（DA） shock wave with dust charge fluctuations, non-Maxwellian ions, and non-isothermal electrons is studied theoretically. The perturbation technique is employed to derive the lower order three-dimensional（3D） Burgers equation, and shock wave solution is explored by the tan-hyperbolic method. The effects of flat trapped and trapped electron distributions in the presence of Maxwellian and non-Maxwellian ions on characteristics shock waves are observed. The temperature ratio of non-Maxwellian ion temperature and non-isothermal electron temperature is found to play an important role in forming the shock-like structure.

关键词： dust acoustics shock wave dust charge fluctutations non-isothermal electrons tan-hyperbolic method

Differential response of injured and healthy retinas to syngeneic and allogeneic transplantation of a clonal cell line of immortalized olfactory ensheathing glia:a double-edged sword

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第8期20卷 2395-2407页

作者： María norte-Muñoz María Portela-Lomba Paloma Sobrado-Calvo Diana Simón Johnny Di Pierdomenico Alejandro Gallego-Ortega Mar Pérez JoséMCabrera-Maqueda Javier Sierra Manuel Vidal-Sanz María Teresa Moreno-Flores Marta Agudo-Barriuso Grupo de Investigación Oftalmología Experimental Departamento de OftalmologíaOptometríaOtorrinolaringología y Anatomía PatológicaFacultad de MedicinaUniversidad de MurciaInstituto Murciano de Investigación Biosanitaria(IMIB)Campus de Ciencias de la SaludMurciaSpain Experimental Sciences Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain Anatomy Histology and Neuroscience DepartmentMedicine FacultyUniversidad Autónoma de MadridMadridSpain Center of neuroimmunology Service of NeurologyLaboratory of Advanced Imaging in Neuroimmunological DiseasesHospital Clínic of BarcelonaInstitut d’Investigacions Biomèdiques August Pi i Sunyer(IDIBAPS)and Universitat de BarcelonaBarcelonaSpain Medicine Faculty Universidad Francisco de VitoriaPozuelo de AlarcónMadridSpain

Olfactory ensheathing glia promote axonal regeneration in the mammalian central nervous system,including retinal ganglion cell axonal growth through the injured optic ***,it is unknown whether olfactory ensheathing glia also have neuroprotective *** ensheathing glia express brain-derived neurotrophic factor,one of the best neuroprotectants for axotomized retinal ganglion ***,we aimed to investigate the neuroprotective capacity of olfactory ensheating glia after optic nerve *** ensheathing glia cells from an established rat immortalized clonal cell line,TEG3,were intravitreally injected in intact and axotomized retinas in syngeneic and allogeneic mode with or without microglial inhibition or immunosuppressive *** and gene expression analyses were *** bulb-derived primary olfactory ensheathing glia and TEG3 express major histocompatibility complex classⅡ*** and syngenically transplanted TEG3 cells survived in the vitreous for up to 21 days,forming an *** axotomized retinas,only the allogeneic TEG3 transplant rescued retinal ganglion cells at 7 days but not at 21 *** these retinas,microglial anatomical activation was higher than after optic nerve crush *** intact retinas,both transplants activated microglial cells and caused retinal ganglion cell death at 21 days,a loss that was higher after allotransplantation,triggered by pyroptosis and partially rescued by microglial inhibition or ***,neuroprotection of axotomized retinal ganglion cells did not improve with these *** different neuroprotective properties,different toxic effects,and different responses to microglial inhibitory treatments of olfactory ensheathing glia in the retina depending on the type of transplant highlight the importance of thorough preclinical studies to explore these variables.

关键词： cell therapy immune recognition major histocompatibility complex class II(MHCII) neuroprotection olfactory ensheathing glia retinal ganglion cells

The sexually dimorphic expression of glutamate transporters and their implication in pain after spinal cord injury

在线全文

学校读者我要写书评

暂无评论

neural Regeneration Research 2025年第11期20卷 3317-3329页

作者： Jennifer M.Colón-Mercado Aranza I.Torrado-Tapias Iris K.Salgado Jose M.Santiago Samuel E.Ocasio Rivera Dina P.Bracho-Rincon Luis H.Pagan Rivera Jorge D.Miranda Department of Physiology University of Puerto RicoMedical Sciences CampusSan JuanPRUSA national Institutes of Health National Human Genome Research InstituteBethesdaMDUSA Universidad Central del Caribe School of MedicineBayamónPRUSA University of Puerto Rico Carolina CampusCarolinaPRUSA Institute of neurobiology San JuanPRUSA

In addition to the loss of motor function,~60% of patients develop pain after spinal cord *** cellular-molecular mechanisms are not well understood,but the data suggests that plasticity within the rostral,epicenter,and caudal penumbra of the injury site initiates a cellularmolecular interplay that acts as a rewiring mechanism leading to central neuropathic *** can lead to the formation of new connections triggering abnormal sensory *** excitatory glutamate transporters are responsible for the reuptake of extracellular glutamate which makes them a critical target to prevent neuronal hyperexcitability and *** previous studies showed a sexually dimorphic therapeutic window for spinal cord injury after treatment with the selective estrogen receptor modulator *** this study,we investigated the anti-allodynic effects of tamoxifen in male and female rats with spinal cord *** hypothesized that tamoxifen exerts anti-allodynic effects by increasing the expression of glutamate transporters,leading to reduced hyperexcitability of the secondary neuron or by decreasing aberrant *** and female rats received a moderate contusion to the thoracic spinal cord followed by subcutaneous slow-release treatment of tamoxifen or matrix pellets as a control(placebo).We used von Frey monofilaments and the“up-down method”to evaluate mechanical *** treatment decreased allodynia only in female rats with spinal cord injury revealing a sexdependent *** expression profile of glutamatergic transporters(excitatory amino acid transporter 1/glutamate aspartate transporter and excitatory amino acid transporter 2/glutamate transporter-1)revealed a sexual dimorphism in the rostral,epicenter,and caudal areas of the spinal cord with a pattern of expression primarily on *** rodents showed a significantly higher level of excitatory amino acid transporter-1 expression while male rodents showed increased

关键词： allodynia central neuropathic pain EAAT-1/GLAST EAAT-2/GLT-1 glutamate transporters selective estrogen receptor modulator sexual dimorphism spinal cord injury trauma

Investigating the UV-excess in Star Clusters with n-body Simulations:Predictions for Future CSST Observations

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2022年第9期22卷 176-201页

作者： Xiaoying Pang Qi Shu Long Wang M.B.n.Kouwenhoven Department of Physics Xi’an Jiaotong-Liverpool UniversitySuzhou 215123China Shanghai Key Laboratory for Astrophysics Shanghai Normal UniversityShanghai 200234China School of Physics and Astronomy Sun Yat-sen UniversityZhuhai 519082China Department of Astronomy School of ScienceThe University of TokyoTokyo 113-0033Japan RIKEn Center for Computational Science KobeHyogo 650-0047Japan

We study the origin of the UV-excess in star clusters by performing n-body simulations of six clusters with n = 10 k and n = 100 k(single stars & binary systems) and metallicities of Z = 0.01, 0.001 and 0.0001, using PETAR. All models initially have a 50% primordial binary fraction. Using Galev nB we convert the simulated data into synthetic spectra and photometry for the China Space Station Telescope(CSST) and Hubble Space Telescope(HST). From the spectral energy distributions we identify three stellar populations that contribute to the UVexcess:(1) second asymptotic giant branch stars, which contribute to the UV flux at early times;(2) naked helium stars and(3) white dwarfs, which are long-term contributors to the FUV spectra. Binary stars consisting of a white dwarf and a main sequence star are cataclysmic variable(CV) candidates. The magnitude distribution of CV candidates is bimodal up to 2 Gyr. The bright CV population is particularly bright in FUV-nUV. The FUV-nUV color of our model clusters is 1–2 mag redder than the UV-excess globular clusters in M87 and in the Milky Way. This discrepancy may be induced by helium enrichment in observed clusters. Our simulations are based on simple stellar evolution;we do not include the effects of variations in helium and light elements or multiple stellar populations. A positive radial color gradient is present in CSST nUV-y for main sequence stars in all models with a color difference of 0.2–0.5 mag, up to 4 half-mass radii. The CSST nUV-g color correlates strongly with HST FUV-nUV for nUV-g > 1 mag, with the linear relation FUV-nUV =(1.09 ± 0.12) ×(nUV-g) +(-1.01 ± 0.22). This allows for conversion of future CSST nUV-g colors into HST FUV-nUV colors, which are sensitive to UV-excess features. We find that CSST will be able to detect UVexcess in Galactic/extragalactic star clusters with ages >200 Myr.

关键词： methods:numerical (stars:)binaries:general stars:kinematics and dynamics

nature of light scalars through photon-photon collisions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2010年第6期34卷 807-815页

作者： n.n.Achasov G.n.Shestakov Laboratory of Theoretical Physics Sobolev Institute for Mathematics

The surprising thing is that arising almost 50 years ago from the linear sigma model （LSM） with spontaneously broken chiral symmetry, the light scalar meson problem has become central in the nonperturbative quantum chromodynamics （QCD） for it has been made clear that LSM could be the low energy realization of QCD. First we review briefly signs of four-quark nature of light scalars. Then we show that the light scalars are produced in the two photon collisions via four-quark transitions in contrast to the classic P wave tensor qq mesons that are produced via two-quark transitions γγ→qq. Thus we get new evidence of the four-quark nature of these states.

关键词： linear sigma model light scalar mesons four-quark states two photon production mechanisms