检索结果-南通市图书馆

Advantageous mechanochemical synthesis of copper(Ⅰ)selenide semiconductor,characterization,and properties

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2022年第3期16卷 433-442页

作者： Katarína Gáborová marcela Achimovičová michal Hegedüs Vladimír Girman mária Kaňuchová Erika Dutková Institute of Geotechnics Slovak Academy of SciencesKošice04001Slovakia Institute of metallurgy Faculty of MaterialsMetallurgy and RecyclingTechnical UniversityKošice04201Slovakia Synthon s.r.o.Blansko67801Czech Republic Faculty of Science Pavol JozefŠafárik UniversityKošice04154Slovakia Institute of Earth resources Faculty of MiningEcologyProcess Control and GeotechnologiesTechnical UniversityKošice04200Slovakia

Copper(I)selenide-nanocrystalline semiconductor was synthesized via one-step mechanochemical synthesis after 5 min milling in a planetary ball *** kinetics of synthesis was followed by X-ray powder diffraction analysis and specific surface area measurements of milled 2Cu/Se *** X-ray diffraction confirmed the orthorhombic crystal structure of Cu_(2)Se with the crystallite size∼25 *** surface chemical structure was studied by X-ray photoelectron spectroscopy,whereby the binding energy of the Cu 2p and Se 3d signals corresponded to Cu^(+)and Se^(2−)oxidation *** electron microscopy revealed agglomerated nanocrystals and confirmed their orthorhombic structure,as *** optical properties were studied utilizing ultraviolet-visible spectroscopy and photoluminescence *** direct bandgap energy 3.7 eV indicated a blue-shift phenomenon due to the quantum size *** type of Cu_(2)Se synthesis can be easily adapted to production dimensions using an industrial vibratory *** advantages of mechanochemical synthesis represent the potential for inexpensive,environmentally-friendly,and waste-free manufacturing of Cu_(2)Se.

关键词： Cu_(2)Se berzelianite nanocrystalline semiconductor mechanochemical synthesis planetary ball mill

Classical Electromagnetic Field Theory in the Presence of magnetic Sources

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2003年第3期20卷 321-324页

作者： Li Kang Chen Wen-Jun Carlos m. naón Department of Physics Hangzhou Teacher's College Hangzhou 310036 Department of Physics Zhejiang University Hangzhou 310027 Instituto de Física La Plata Departamento de Física Facultad de Ciencias Exactas Universidad Nacional de La Plata CC 67 1900 La Plata Argentina

Using two new well-defined four-dimensional potential vectors, we formulate the classical maxwell field theory in a form which has manifest Lorentz covariance and SO(2) duality symmetry in the presence of magnetic sources. We set up a consistent Lagrangian for the theory. Then from the action principle we obtain both maxwell's equation and the equation of motion of a dyon moving in the electromagnetic field.

关键词： maxwell equations

Iron-doped nickel disulfide nanoarray： A highly efficient and stable electrocatalyst for water splitting

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

nano research 2016年第11期9卷 3346-3354页

作者： na Yang Chun Tang Kunyang Wang Gu Du Abdullah m. Asiri Xuping Sun College of Chemistry Sichuan University Chengdu 610064 China Chengdu Institute of Geology and mineral resources Chengdu 610081 China Chemistry Department Faculty of Science King Abdulaziz University Jeddah 21589 Saudi Arabia

Developing efficient water-splitting electrocatalysts, particularly for the anodic oxygen evolution reaction （OEr）, is an important challenge in energy conversion technologies. In this study, we report the development of iron-doped nickel disulfide nanoarray on Ti mesh （Fe0.1-NiS2 na/Ti） via the sulfidation of its nickel-iron-layered double hydroxide precursor （NiFe-LDH naFFi）. As a three-dimensional OEr anode, Fe0.1NiS2 na/Ti exhibits remarkable activity and stability in 1.0 m KOH, with the requirement of a low overpotential of 231 mV to achieve 100 mA·cm^-2. In addition, it exhibits excellent activity and durability in 30 wt.% KOH. Notably, this electrode is also efficient for the cathodic hydrogen evolution reaction under alkaline conditions.

关键词： nickel disulfide (NiS2) iron doping nanosheet array water splitting oxygen evolution reaction

Nucleus-acoustic solitary waves in self-gravitating degenerate quantum plasmas

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

Chinese Physics B 2018年第4期27卷 191-197页

作者： D m S Zaman m Am.na P r Dip A A mamun Department of Physics Jahangirnagar University Department of EEE Bangladesh University of Business and Technology(BUBT)

Nucleus-acoustic（na） solitary waves（SWs） propagating in a self-gravitating degenerate quantum plasma（SDQP）system（containing non-relativistically degenerate heavy and light nuclei,and non-/ultra-relativistically degenerate electrons） have been theoretically *** modified Korteweg–de Vries（m K-d V） equation has been derived for both planar and non-planar geometry by employing the reductive perturbation *** is shown that the na SWs exist with positive（negative） electrostatic（self-gravitational） *** is also observed that the effects of non-/ultra-relativistically degenerate electron pressure,dynamics of non-relativistically light nuclei,spherical geometry,*** modify the basic features（e.g.,amplitude,width,speed,etc.） of the na *** applications of our results,which are relevant to astrophysical compact objects,like white dwarfs and neutron stars,are briefly discussed.

关键词： self-gravitational potential solitary waves

Enhanced photocatalytic activity of Ce-doped ZnO nanopowders synthesized by combustion method

在线全文

学校读者我要写书评

暂无评论

Journal of rare Earths 2015年第3期33卷 255-262页

作者： m.Ahmad E.Ahmed Fezza Zafar N.r.Khalid N.A.Niaz Abdul Hafeez m.Ikram m.Ajmal Khan 洪樟连 Department of Physics Bahauddin Zakariya University State Key Laboratory of Silicon materials Department of Materials Science & Engineering Zhejiang University Science and Technology Division University of Education

Facile and fast combustion method was used to synthesize Zn O and Ce-doped Zn O（CZO） nanocrystalline powders photocatalysts with different cerium concentrations（0.5 wt.%–10.0 wt.%） followed by calcination at 700 oC for 3 h. The prepared samples were characterized by a variety of characterization techniques such as X-ray diffraction（XrD）, scanning electron microscopy（SEm） combined with energy dispersive X-ray diffraction（EDX）, transmission electron microscopy（TEm）, UV-visible spectroscopy, BET surface area analyser and photoluminescence spectroscopy（PL）, to study the crystal structure, surface morphology, chemical composition and optical properties. It was observed from XrD results that synthesized powders had hexagonal wurtzite structure with the smallest crystallite size about 13 nm. Absorption spectra showed that cerium doping enhanced the light absorption properties towards the visible light region. Photoluminescence spectra for Ce-doped Zn O samples exhibited relatively weak near band edge（NBE） emission peaks as compared to that of pristine Zn O. The photocatalytic activities of the prepared samples were evaluated by photocatalytic degradation of rhodamine B（rh B） under UV light and visible light（λ≥420 nm） irradiation. The textile mill effluent containing organic matters was also treated under sunlight using photocatalysis and the reduction in the chemical oxygen demand（COD） of the treated effluent revealed a complete destruction of the organic molecules along with colour removal. The results showed that the CZO photocatalyst doped with 3.0 wt.% cerium exhibited four times enhanced photocatalytic activity compared to pure Zn O. The enhanced photocatalytic activity could be attributed to extended visible light absorption and inhibition of the electron-hole pair＇s recombination.

关键词： ZnO cerium combustion photocatalyst rhodamine B rare earths

circT P63-N suppresses the proliferation and metastasis of nasopharyngeal carcinoma via engaging with HSP90AB1 to modulate the YAP1/Hippo signaling pathway

在线全文

学校读者我要写书评

暂无评论

Science China Life Sciences 2025年

作者： Dan Wang Sicheng Zuo Junshang Ge Hongke Qu Jie Wu na Yi Lei Shi Yumin Wang Yongzhen mo Chunmei Fan Yi He Pan Chen ming Zhou Bo Xiang Wei Xiong Wenjia Guo Zhaoyang Zeng Can Guo NHC Key Laboratory of Carcinogenesis and Hunan Key Laboratory of Cancer metabolism Hunan Cancer Hospital and the Affiliated Cancer Hospital of Xiangya School of Medicine Central South University Key Laboratory of Carcinogenesis and Cancer Invasion of the Chinese ministry of Education Cancer Research Institute and School of Basic Medicine Sciences Central South University Furong Laboratory Cancer research Institute Affiliated Cancer Hospital of Xinjiang Medical University Xinjiang Key Laboratory of Translational Biomedical Engineering

Circular rnas(circrnas) play pivotal roles in the development and progression of various diseases, including malignant tumors. However,the biological functions and the underlying mechanisms of many circrnas remain elusive. In this study, we identified a novel circrna,circTP63-N, generated through the splicing of exons 2–4 of the TP63 gene in nasopharyngeal carcinoma(NPC). circTP63-N was found to be downregulated in clinical samples of NPC. Both in vitro and in vivo experiments unequivocally demonstrated that circTP63-N inhibits the proliferation and metastasis of NPC cells. Further investigations revealed that circTP63-N interacted with the HSP90AB1 protein, leading to the recruitment of LATS/YAP1 proteins. This, in turn, induced phosphorylation and ubiquitination-dependent degradation of YAP1, resulting in reduced nuclear translocation of YAP1 and inhibition of the transcriptional activation of downstream oncogenic genes, including INHBA, mmP3, and CCNE2. Our findings highlight the identification of circTP63-N, a novel circrna encoded by an important tumor-relevant gene TP63 and elucidate its molecular mechanism as a tumor suppressor in NPC. These insights offer novel potential molecular markers and therapeutic targets for the clinical diagnosis and treatment of NPC.

关键词：

Influence of na_(2)SiO_(3)/naOH ratio on Calcined magnesium Silicate Based Geopolymer——Experimental and Predictive Study

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 Wuhan University of Technology(materials Science) 2023年第5期38卷 1077-1085页

作者： Premkumar r ramesh Babu Chokkalingam meyyappan PL Shanmugasundaram m Kalasalingam Academy of research and Education Krishnan KoilTamil Nadu626126 India Vellore Institute of Technology-Chennai Tamilnadu600127 India

This study aims to investigate the behavior of alkali activated mortar,which is made of naturally available magnesium silicate as source *** magnesium silicate,ultrafine natural steatite powder(UFNSP)is used as the primary source of binder,and the activation is initiated through the alkali liquid which is proportioned in various combinations of silicate to hydroxide ratio(na_(2)SiO_(3)/na OH)ratio,and this ratio in this study varies from 1 to *** UFNSP is calcined at two difierent temperatures,700 and 1000℃.The mortar mix is proportioned as 1:3 between powder and the fine aggregate,and the mortar is prepared with hydroxide molarity(m)of 10 *** mortar is cured for 48 hours at 60℃and the compressive strength was *** the mix were studied for its microstructural behavior along with compressive *** mix proportion of the mortar,and the results obtained through microstructural characterization were combinedly formed as input for artificial neural network(ANN)predictive *** model is designed to predict the compressive strength,which is trained through Bayesian regularization algorithm with varying hidden neurons of 7 to *** experimental and predictive study shows that the strength is influenced by both na_(2)SiO_(3)/na OH ratio and calcination *** the ANN is influenced by mainly calcination temperature and uncorrelation occurs in selected samples of 1000℃calcined UFNSP mix.

关键词： magnesium silicate silicate alkali activation geopolymer UFNSP prediction

Effect of Sulfur Precursor on Dimensions of One-dimensional CdS nanocrystals

在线全文

学校读者我要写书评

暂无评论

Journal of materials Science & Technology 2009年第4期25卷 462-464页

作者： m.maleki Sh.mirdamadi r.Ghasemzadeh m.Sasani Ghamsari Department of metallurgy and material Engineering Iran University of Science & Technology Solid State Lasers research Group Laser & Optics Research School

One-dimensional CdS nanocrystals have been prepared by solvothermal method using cadmium acetate as a cadmium precursor, elemental sulfur and na2S, as a sulfur precursor, and ethylenediamine as a solvent at 150℃ for 5 h. The nanocrystals were characterized by X-ray diffraction （XrD）, scanning electron microscopy （SEm）, transmission electron microscopy （TEm） and UV-Vis absorption spectroscopy. XrD patterns indicate that both na2S and elemental sulfur as the sulfur precursor result in CdS nanorods with wutzite phase （hexagonal structure）. SEm and TEm images show that diameter of CdS nanorods can be decreased using na2S instead of elemental sulfur. For the growth of CdS nanorods, a mechanism has been proposed. Uv-Vis absorption of CdS nanorods （sulfur precursor： na2S） was shown blue shift to 485 nm due to the quantum size effect.

关键词： nanomaterials Semiconductors CdS nanorods na2S Solvothermal method

Amino acids 89-96 of Salmonella typhimunum Tlagell=n represent the major domain responsible for TLr5-independent adjuvanticity in the humoral immune response

在线全文

学校读者我要写书评

暂无评论

Cellular & molecular Immunology 2015年第5期12卷 625-632页

作者： Lei Zhang Zhiming Pan Xilong Kang Yun Yang Heekap Kang na Zhang James m rosati Xinan Jiao Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis Yangzhou China Jiangsu Key Laboratory of Zoonosis Yangzhou University Yangzhou China ministry of Education Key Lab for Avian Preventive medicine Yangzhou University Yangzhou China Division of Nephrology and Hypertension Department of Medicine Northwestern University Feinberg School of Medicine Chicago IL USA

Toll-like receptor 5 （TLr5） signaling in response to flagellin is dispensable for inducing humoral immunity, but alterations of aa 89-96, the TLr5 binding site, significantly reduced the adjuvanticity of flagellin. These observations indicate that the underlying mechanism remains incompletely understood. Here, we found that the native form of Salmonella typhimurium aa 89-96-mutant flagellin extracted from flagella retains some TLr5 recognition activity, indicating that aa 89-96 is the primary, but not the only site that imparts TLr5 activity. Additionally, this mutation impaired the production of IL-lp and IL-18. Using TLr5KO mice, we found that aa 89-96 is critical for the humoral adjuvant effect, but this effect was independent of TLr5 activation triggered by this region of flageUin. In summary, our findings suggest that aa 89-96 of flagellin is not only the crucial site responsible for TLr5 recognition, but is also important for humoral immune adjuvanticity through a TLr5-independent pathway.

关键词： adjuvanticity amino acids 89-96 Salmonella typhimurium flagellin TLr5 activity