检索结果-南通市图书馆

Effect of samarium doping on structural, optical and magnetic properties of vertically aligned ZnO nanorod arrays

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 2017年第10期35卷 1002-1007页

作者： D.ranjith kumar K.S.ranjith L.R.Nivedita R.t.Rajendra kumar Department of Nanoscience and technology Bharathiar University Coimbatore India Advanced Materials and Devices Laboratory (AMDL) Department of Physics Bharathiar University Coimbatore India

Samarium doped vertically aligned one dimensional ZnO nanorod（NR） arrays were grown by vapor phase transport（VPt） method through vapor solid（VS） growth process. Influence of different concentrations（0% to 8%） of Sm（all Sm contents in the paper are in mass fraction） on the ZnO NR arrays were investigated by X-ray diffraction（XRD）, field emission scanning electron microscopy（FESEM）, photoluminescence（PL）, Raman spectroscopy and vibrating sample magnetometry（VSM） techniques, respectively. X-ray diffraction studies revealed that the ZnO NR arrays were perfectly oriented along（002） crystallographic orientation with wurtzite crystal structure. Photoluminescence results showed an increase in oxygen vacancies due to increase in Sm doping. M-H curves revealed enhanced ferromagnetic behavior, and the magnetic moment values were 0.45, 0.363, 1.694, 3.613 and 2.197 emu/cm^3 for（0–8%） Sm doped ZnO NR arrays respectively. the curve revealed that paramagnetic behavior was observed for undoped ZnO NR arrays and on increasing the Sm dopant to 4%, paramagnetic switched to ferromagnetic behavior.

关键词： Sm doped ZnO room temperature ferromagnetism(RtFM) defects rare earths

Water solubility enhancements of pyrene by single and mixed surfactant solutions

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2001年第4期13卷 491-496页

作者： Zhu, L.-z. chiou, c.t. Department of Environmental Science Zhejiang University Hangzhou 310028 China

Water solubility enhancements of pyrene by both single-surfactant and mixed-surfactant solutions were compared and evaluated. the solubility of pyrene in water was greatly enhanced by each of triton X-100 (tX100), triton X-405 (tX405), Brij 35 and SDS, in which the water solubility enhancements increased with increasing surfactant concentrations. the extent of solubility enhancements at surfactant concentrations below. the cMc is the order of tX100 > Brij 35 > tX405 > SDS; the sequence at surfactant concentrations above the cMc is tX100 > Brij 35 > SDS > tX405. Pyrene was solubilized synergistically by anionic-nonionic mixed surfactant solutions, especially at low surfactant concentrations. the synergistic power of the mixed surfactants is SDS-tX405 > SDS-Brij 35 > SDS-tX100. the synergism as noted is attributed to increasing Kmc and/or decreasing the cMc of the mixed surfactant solution. For SDS-tX405 and SDS-Brij 35 mixed surfactant solutions, an increase in Kmc is coupled with a decrease in the cMc; for SDS-tX100, only a decreased in the cMc value is noted. Mixed-surfactant solutions may improve the performance of the surfactant-enhanced remediation (SER) of soils by increasing the bioavailability and biodegradation of non-aqueous-phase organic pollutants and reducing the level of surfactant pollution and remediation expenses.

关键词： Biodegradation concentration (process) Solubility Water

transloc.t.r protein and neurodegeneration: insights from Alzheimer’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4期20卷 1090-1091页

作者： Arpit kumar Pradhan Rainer Rupprec.t.Gerhard Rammes Klinik für Anaesthesiologie und Intensivmedizin der technischen Universität München Klinikum rechts der IsarMunichGermany Graduate School of Systemic Neurosciences Ludwig-Maximilians-Universität MünchenMartinsriedGermany Department of Psychiatry and Psychotherapy University RegensburgRegensburgGermany

the 18 kDa transloc.t.r protein(tSPO)loc.t.d on the outer mitochondrial membrane regulates several key cellular processes including mitochondrial homeostasis,cholesterol transport,apoptosis,cell proliferation,and maintenance of mitochondrial health(Rupprec.t.et al.,2022,2023).tSPO is expressed in both peripheral organs and the central nervous system,with a more pronounced expression in tissues that produce *** main reason why tSPO has garnered so much attention is because it plays a key role in neurosteroidogenesis by transferring cholesterol from the outer to the inner mitochondrial membrane,which is the rate-limiting step in neurosteroid synthesis.A cholesterol-recognizing amino acid consensus domain has been identified in the c.t.solic c.t.rminus of the tSPO protein by both in vitro and site-directed mutagenesis experiments(Li et al.,2001).However,the role of tSPO in the process of neurosteroid synthesis has been challenged by several studies,particularly tSPO knockout models,which suggest that tSPO removal does not affect the phenotype or the system’s viability(tu et al.,2014).However,ligands targeting tSPO have been shown to enhance levels of neurosteroids which suggests that neurosteroidogenesis is one of the major functional roles mediated by the tSPO protein.

关键词： cholesterol organs

Photoc.t.lytic degradation of endocrine disruptor Bisphenol-A in the presence of prepared ce_xZn_(1-x)O nanocomposites under irradiation of sunlight

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2014年第11期26卷 2362-2368页

作者： Kamaraj M. ranjith K.S. Rajeshwari Sivaraj Rajendra kumar R.t. Hasna Abdul Salam Department of Biotechnology Dr.N.G.P. Arts and Science College Coimbatore 641048 Tamil Nadu India Advanced Materials and Devices Laboratory Department of Physics Bharathiar University Coimbatore 641046 Tamil Nadu India Department of Biotechnology School of Life Sciences Karpagam University Coimbatore 641021 Tamil Nadu India

Photoc.t.lytic degradation of Bisphenol A （BPA）, a representative endocrine disruptor chemical, was carried out under irradiation of sunlight in the presence of cexZn1-xO nanophotoc.t.lyst. cerium （ce） ions were successfully incorporated into the bulk lattice of ZnO by simple co-precipitation process. the cexZn1-xO composite nanostructures exhibited higher photoc.t.lytic efficiency than pure ZnO in the degradation of BPA under sunlight irradiation and nearly complete mineralization of BPA was achieved. the degradation rate was strongly dependent on factors such as the size and structure of c.t.lyst, doping material concentration, BPA concentration, c.t.lyst load, irradiation time and pH levels. this work suggested that the cexZn1-xO assisted photoc.t.lytic degradation is a versatile, economic, environmentally benign and efficient method for BPA removal in the aqueous environment.

关键词： Bisphenol A (BPA) ZnO cexZn1-xO Sunlight co-precipitation cerium

Supercritical fluid-assisted fabric.t.on of c-doped co_(3)O_(4) nanoparticles based on polymer-coated metal salt nanoreactors for efficient enzyme-mimicking and glucose sensor properties

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第5期16卷 7431-7442页

作者： Ze-Wen Kang Jun-Yu Zhang Ze-Zhen Li ranjith kumar Kankala Shi-Bin Wang Ai-Zheng chen Institute of Biomaterials and tissue Engineering Huaqiao UniversityXiamen 361021China Fujian Provincial Key Laboratory of Biochemical technology(Huaqiao University) Xiamen 361021China Instrumental Analysis center Laboratory and Equipment Management DepartmentHuaqiao UniversityXiamen 361021China

Nanomaterials doped with non-metallic c have attracted tremendous attention as potential nano-artificial enzymes due to their ability to change the energy band structure to improve their intrinsic ***,we report a green,facile,efficient,fast strategy to access high-performance nanozymes via supercritical cO_(2)fluid technology-fabric.t.d polymer nanoreactor of poly-(methyl vinyl ether-co-maleic anhydride)(PVM/MA)coated co(NO_(3))_(2)into c-doped co_(3)O_(4)(c-co_(3)O_(4))nanozyme by a onestep calcination *** PVM/MA to c doping into co_(3)O_(4)shortens the entire lattice constant of the crystal structure,and the overall valence band energy level below the Fermi level shifts toward the lower energy *** as-prepared cco_(3)O_(4)demonstrated significant peroxidase-like c.t.lytic activity,significantly greater than the undoped co_(3)O_(4)nanoparticle *** following density functional theory(DFt)calculations revealed that the doped nano-enzyme c.t.lytic site displayed a unique electronic structure,altering the material surface with more electrons to fill the anti-bond of the two molecular orbitals,significantly improving the peroxidase-like enzyme c.t.lytic and glucose sensor *** resultant enzymatic glucose sensing in a linear range of 0.1–0.6 mM with a detection limit of 3.86μM is in line with standard Michaelis–Menten ***,this work demonstrates that converting polymers into nanozymes of c-doped form by supercritical cO_(2)fluid technology in a step is an effective strategy for constructing high-performance glucose sensor *** cost-effective,reliable,precise system offers the potential for rapid analyte detection,facilitating its applic.t.on in a variety of fields.

关键词： supercritical fluid poly-(methyl vinyl ether-co-maleic anhydride)(PVM/MA) c-doped co_(3)O_(4) nanozymes density functional theory(DFt)calculation

3D bioprinting of conductive hydrogel for enhanced myogenic differentiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Regenerative Biomaterials 2021年第5期8卷 14-24页

作者： Ying Wang Qingshuai Wang Shengchang Luo Zhoujiang chen Xiang Zheng ranjith kumar Kankala Aizheng chen Shibin Wang Institute of Biomaterials and tissue Engineering Huaqiao UniversityXiamen 361021P.R.China School of Pharmaceutical Engineering and Life Science Changzhou UniversityChangzhou 213164P.R.China Fujian Provincial Key Laboratory of Biochemical technology(Huaqiao University) Xiamen 361021P.R.China

Recently,hydrogels have gained enormous interest in three-dimensional(3D)bioprinting toward developing functional substitutes for tissue ***,it is highly challenging to transmit electrical signals to cells due to the limited electrical conductivity of the bioprinted ***,we demonstrate the 3D bioprinting-assisted fabric.t.on of a conductive hydrogel scaffold based on poly-3,4-ethylene dioxythiophene(PEDOt)nanoparticles(NPs)deposited in gelatin methacryloyl(GelMA)for enhanced myogenic differentiation of mouse myoblasts(c2c12 cells).Initially,PEDOt NPs are dispersed in the hydrogel uniformly to enhance the conductive property of the hydrogel ***,the incorporated PEDOt NPs showed minimal influence on the printing ability of ***,c2c12 cells are successfully encapsulated within GelMA/PEDOt conductive hydrogels using 3D extrusion ***,the proliferation,migration and differentiation efficacies of c2c12 cells in the highly conductive GelMA/PEDOt composite scaffolds are demonstrated using various in vitro investigations of live/dead staining,F-actin staining,desmin and myogenin immunofluorescence ***,the effects of electrical signals on the stimulation of the scaffolds are investigated toward the myogenic differentiation of c2c12 cells and the formation of myotubes in ***,our findings demonstrate that the fabric.t.on of the conductive hydrogels provides a feasible approach for the encapsulation of cells and the regeneration of the muscle tissue.

关键词： 3D bioprinting conductive hydrogel electrical stimulation myoblasts myogenic differentiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

微型全分析系统

分析化学 2000年第10期28卷 1295-1299页

作者：徐溢,Jan c.t. Eijkel,A.Manz 重庆大学环境与化学化工学院!重庆400044 Analytical Science center! Depe of chemistry Imperial　college England SW77 2AY Analytical Science center!Depe of 　chemistry Imperial college England SW77 2AY

系统阐述了分析化学新兴研究领域微型全化学分析系统（μ－ＴＡＳ）的概念和原理，并对其应用现状及发展趋势进行了综述

关键词：微型全化学分析系统微芯片评述

Feature selection for face recognition:a memetic algorithmic approach

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第8期10卷 1140-1152页

作者： Dinesh kumar Shakti kumar c.S.RAI Department of computer Science & Engineering Guru Jambheshwar University of Science & Technology Institute of Science and technology University School of Information technology GGS Indraprastha University

the eigenface method that uses principal component analysis(PcA) has been the standard and popular method used in face *** paper presents a PcA-memetic algorithm(PcA-MA) approach for feature *** has been extended by MAs where the former was used for feature extraction/dimensionality reduction and the latter exploited for feature *** were performed over ORL and YaleB face databases using Euclidean norm as the *** was found that as far as the recognition rate is concerned,PcA-MA completely outperforms the eigenface *** compared the performance of PcA extended with genetic algorithm(PcA-GA) with our proposed PcA-MA *** results also clearly established the supremacy of the PcA-MA method over the PcA-GA *** further extended linear discriminant analysis(LDA) and kernel principal component analysis(KPcA) approaches with the MA and observed significant improvement in recognition rate with fewer *** paper also compares the performance of PcA-MA,LDA-MA and KPcA-MA approaches.

关键词： Face recognition Memetic algorithm (MA) Principal component analysis (PcA) Linear discriminant analysis (LDA) Kernel principal component analysis (KPcA) Feature selection

在线全文

学校读者我要写书评

暂无评论

QUARK MASSES

chinese Physics c 2016年第10期40卷 653-660页

作者： A.V. Manohar c.t. Sachrajda R.M. Barnett University of california San Diego University of Southampton LBNL

A. Introduction this note discusses some of the theoretical issues relevant for the determination of quark masses, which are fundamental parameters of the Standard Model of particle physics. Unlike the leptons, quarks are confined inside hadrons and are not observed as physical particles. Quark masses therefore cannot be measured directly, but must be determined indirectly through their influence on hadronic properties. Although one often speaks loosely of quark masses as one would of the mass of the electron or muon, any quantitative statement about the value of a quark mass must make careful reference to the particular theoretical framework that is used to define it. It is important to keep this scheme dependence in mind when using the quark mass values tabulated in the data listings.

关键词：