检索结果-南通市图书馆

UV Photolysis of N2O Isotopomers： Isotopic Fractionations and Product Rotational Quantum State Distributions

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 Journal of Chemical Physics 2011年第6期24卷 679-685,I0003页

作者： Mohammad noh Daud 吉隆坡马来亚大学化学系吉隆坡50603

The time-dependent quantum wave packet method is used to study the dynamics of the pho- todissociation processes for the isotopomers 14N14N16O, 14N15N16O, 15N14N16O, 15N15N16O, 14N14N17O, and 14N14N18O. In general, the computed isotopic fractionation factors derived from the absorption cross sections of five heavy isotopomers are in good agreement with the experimental results. Relative to the 14NI4N16O isotopomer, the N2 rotational state distributions for the isotopically nitrogen substituted N2O are found to be entirely shifted to higher rotational states. Similar to its isotopic fractionation factors, the N2 rotational state distributions for the asymmetric isotopomers 14N15N16O and 15N14N16O are found to be observably different.

关键词： Time-dependent wavepacket Isotopic fractionation Product rotational distribution

Acute liver injury induces expression of FGF23 in hepatocytes via orphan nuclear receptor ERRγ signaling

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Genes & Diseases 2023年第3期10卷 679-682页

作者： Yoon Seok jung Yong-Hoon Kim Kamalakannan Radhakrishnan jung-Ran noh jung Hyeon Choi Hyo-Jin Kim Jae-Ho Jeong Steven Dooley Chul-Ho Lee Hueng-Sik Choi School of Biological Sciences and Technology Chonnam National UniversityGwangju 61186Republic of Korea Laboratory Animal Resource Center Korea Research Institute of Bioscience and Biotechnology125 Gwahak-roYuseong-guDaejeon 34141Republic of Korea Department of Functional Genomics KRIBB School of BioscienceKorea University of Science and Technology(UST)Daejeon 34113Republic of Korea Combinatorial Tumor Immunotherapy MRC Chonnam National University Medical SchoolHwasun-gunJeonnam 58128Republic of Korea Department of Microbiology Chonnam National University Medical SchoolGwangju 61186Republic of Korea Molecular Hepatology Section Medical Faculty MannheimHeidelberg University69117 HeidelbergGermany

Fibroblast growth factor 23(FGF23)is an osteocyte-and osteoblast-derived hormone that primarily regulates phosphate and vitamin D *** FGF23 levels are abnormally increased in pathological conditions like acute or chronic kidney injury,resulting in disease progression as well as increased rates of morbidity and mortality.^(1) However,FGF23 production in acute liver injury is not fully *** this study.

关键词： FGF23 acute vitamin

Analysis of Aluminum Dust Cloud Combustion Using Flame Emission Spectroscopy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

光谱学与光谱分析 2015年第9期35卷 2431-2438页

作者： Sanghyup Lee Kwanyoung noh Woongsup Yoon Advanced Energy and Propulsion Laboratory Department of Mechanical EngineeringYonsei University

In this study,aluminum flame analysis was researched in order to develop a measurement method for high-energy-density metal aluminum dust cloud combustion,and the flame temperature and UV-VIS-IR emission spectra were precisely measured using a *** the micron-sized aluminum flame temperature was higher than 2 400 K,Flame temperature was measured by a non-contact optical technique,namely,a modified two-color method using 520 and 640nm light,as well as by apolychromatic fitting *** methods were applied experimentally after accurate *** flame temperature was identified to be higher than 2 400 Kusing both *** analyzing the emission spectra,we could identify AlO radicals,which occur dominantly in aluminum *** study paves the way for realization of a measurement technique for aluminum dust cloud combustion flames,and it will be applied in the aluminum combustors that are in development for military purposes.

关键词： Aluminum combustion Flame characteristics High-temperature measurement Emission spectroscopy Diagnostics

Rare earth double activated phosphors for different applications

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2010年第S1期28卷 1-11页

作者： Mihail Nazarov Do Young noh Department of Materials Science and Engineering Gwangju Institute of Science and Technology1 Oryong-dongBuk-guGwangju 500-712Republic of Korea

For the purpose of development of highly energy-efficient light sources,one needs to design highly efficient green,red and yellow phosphors,which are able to absorb excitation energy and generate *** this contribution,we present our results on producing some efficient phosphors with improved luminescence *** double activation,energy could be transferred from one luminescent activator to the other one,resulting in more efficient or brighter device ***-activators could be added to a host material to change the color of the emitted *** incorporation of Eu3+ or Tb3+ ions into the CaWO4 crystal lattice modified the luminescence spectrum due to the formation of the emission centers that generated the specific red and green *** efficient new red phosphors based on YNbO4 and doped by Eu3+,Ga3+,Al3+ allowed recommending these materials as good candidates for different applications including LED and X-ray intensifying *** double activated TAG with Ce3+ and Eu3+ and for different mole ratios of Ce/Eu,the color temperature changed from 5500 K(0.331,0.322) up to 4200 K(0.370,0.381) and the light became 'warmer'.Application of TAG:Ce,Eu in the light emitting device showed better chromaticity coordinates of luminescence and color rendering index of LEDs.

关键词： optical materials phosphors luminescence rare earths

Structural and Dielectric Properties of Dy-doped(Ba,Sr,Ca) TiO_3 Thick Films

在线全文

学校读者我要写书评

暂无评论

材料科学与工程学报 2007年第6期25卷 928-931页

作者： hyun-Ji noh Sung-Gap Lee Sang-Man Park Sang-Eun Yun Dept.of ceramic Engineering Eng.Res.Insti.Gyeongsang National University 900 GajwaJinju-siGyeongnam 660-701Korea

Preparation and electrocatalytic activities of Pt-TiO_2 nanotubes(Ba_ 0.57Sr_ 0.33Ca_ 0.10)TiO_3 powders,prepared by the sol-gel method,were doped MnCO_3 as acceptor and Dy_2O_3 as *** powder was mixed with an organic vehicle and BSCT thick films were fabricated by the screen-printing techniques on alumina *** structural and dielectric properties of BSCT thick films were investigated with variation of Dy_2O_3 *** a result of the differential thermal analysis(DTA),exothermic peak was observed at around 670℃ due to the formation of the polycrystalline perovskite *** the BSCT thick films showed the XRD patterns of a typical polycrystalline perovskite *** average grain size of BSCT thick films decreased with increasing amount of Dy_2O_*** relative dielectric constant and dielectric loss of the BSCT thick film doped Dy_2O_3 0.1mol% were 4637.4 and 1.6% at 1kHz,respectively.

关键词：介电性能结构性能镝厚膜丝网印刷术

Implementation of remote monitoring system for prediction of tool wear and failure using ART2

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2011年第1期18卷 177-183页

作者： noh Min-Seok HONG Dae Sun School of Mechatronics Changwon National University

Remote monitoring of tools for prediction of tool wear in cutting processes was considered, and a method of implementation of a remote-monitoring system previously developed was proposed. Sensor signals were received and tool wear was predicted in the local system using an ART2 algorithm, while the monitoring result was transferred to the remote system via intemet. The monitoring system was installed at an on-site machine tool for monitoring three kinds of tools cutting titanium alloys, and the tool wear was evaluated on the basis of vigilances, similarities between vibration signals received and the normal patterns previously trained. A number of experiments were carried out to evaluate the performance of the proposed system, and the results show that the wears of finishing-cut tools are successfully detected when the moving average vigilance becomes lower than the critical vigilance, thus the appropriate tool replacement time is notified before the breakage.

关键词： tool wear remote monitoring system ART2 neural network machine tool tool replacement time

Inhibitory effects of rapamycin on the different stages of hepatic fibrosis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第23期20卷 7452-7460页

作者： Yun Jeung Kim Eaum Seok Lee Seok hyun Kim Heon Young Lee Seung Moo noh Dae Young Kang Byung Seok Lee Department of Internal Medicine Chungnam National University School of MedicineDaejeon 301-721South Korea Department of Surgery Chungnam National University School of MedicineDaejeon 301-721South Korea Department of Pathology Chungnam National University School of MedicineDaejeon 301-721South Korea

AIM: To investigate and compare the inhibitory effects of rapamycin in the different stages of liver fibrosis.

关键词： Liver cirrhosis Sirolimus Transforming growth factor beta Platelet-derived growth factor Ribosomal protein S6 kinases

Thermo-physical Characteristics of Nickel-coated Aluminum Powder as a Function of Particle Size and Oxidant

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 Journal of Mechanical Engineering 2016年第6期29卷 1244-1255页

作者： LEE Sanghyup noh Kwanyoung LIM Jihwan YOON Woongsup Advanced Energy and Propulsion Laboratory Department of Mechanical Engineering Yonsei University Missile System Integration / propulsion Center Hanwha Corp.

Aluminum particles 15-25 μm in size are widely used in fuel propellants and underwater propulsion systems in national defense research. However, these particles are covered with an aluminum oxide film, which has a high melting point, so ignition is difficult. To improve the ignitability of high-energy aluminum powder and to understand the reaction phenomenon as a function of particle size（15-25 μm, 74-105 μm, and 2.38 mm） and oxidizer（air, CO2, and argon）, the natural oxide films are chemically removed. The particles are then coated with nickel using an electro-less method. The degree of nickel deposition is confirmed qualitatively and quantitatively through surface analysis using scanning electron microscopy/energy dispersive spectroscopy. To characterize the nickel coatings, elemental analysis is also conducted by using X-ray diffraction. Thermogravimetric analysis/differential scanning calorimetry （TGA/DSC） enable comparisons between the uncoated and coated aluminum, and the reaction process are investigated through fine structural analysis of the particle surfaces and cross sections. There are little difference in reactivity as a function of oxidant type. However, a strong exothermic reaction in the smaller nickel-coated aluminum particles near the melting point of aluminum accelerates the reaction of the smaller particles. Explanation of the reactivity of the nickel-coated aluminum depending on the particle sizes is attempted.

关键词： nickel-coated aluminum TGA/DSC aluminum ignition combustion intermetallic reaction

A Steam-Plasma Igniter for Aluminum Powder Combustion

在线全文

学校读者我要写书评

暂无评论

Plasma Science and Technology 2015年第5期17卷 392-401页

作者： Sanghyup LEE Kwanyoung noh Jihwan LIM Woongsup YOON Mechanical Engineering Department of Yonsei University

High-temperature ignition is essential for the ignition and combustion of energetic metal fuels, including aluminum and magnesium particles which are protected by their high- melting-temperature oxides. A plasma torch characterized by an ultrahigh-temperature plasma plume fulfills such high-temperature ignition conditions. A new steam plasma igniter is designed and successfully validated by aluminum power ignition and combustion tests. The steam plasma rapidly stabilizes in both plasma and steam jet modes. Parametric investigation of the steam plasma jet is conducted in terms of arc strength. A high-speed camera and an oscilloscope method visualize the discharge characteristics, and optical emission spectroscopy measures the thermochemical properties of the plasma jet. The diatomic molecule OH fitting method, the Boltzmann plot method, and short exposure capturing with an intensified charge coupled device record the axial distributions of the rotational gas temperature, excitation temperature, and OH radical distribution, respectively. The excitation temperature at the nozzle tip is near 5500 K, and the gas temperature is 5400 K.

关键词： steam plasma igniter aluminum emission spectroscopy energetic metal fuels powder ignition and combustion optical