检索结果-南通市图书馆

Measurement of inner surface roughness of capillary by an x-ray reflectivity method

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第4期20卷 217-221页

作者：李玉德林晓燕谭植元孙天希刘志国 The key laboratory of beam technology and material modification of ministry of education College of Nuclear Science and TechnologyBeijing Normal UniversityBeijing Radiation Center

The inner surface roughness of a capillary is investigated by the reflectivity of x-rays penetrating through the capillary. The results are consistent with the data from atomic force microscope （AFM）. The roughness ... 详细信息

关键词： inner surface roughness reflectivity method capillary

Microstructure and mechanical properties of TiN/AlN multilayers deposited by filtered vacuum arc deposition

在线全文

学校读者我要写书评

暂无评论

中国有色金属学会会刊：英文版 2004年第z1期14卷 234-237页

作者： ZHANG Xu ZHANG Hui-xing ZHANG Tong-he WU Xian-ying key laboratory of beam technology and material modification of ministry of education Institute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China Key Laboratory of Beam Technology and Material Modification of Ministry of EducationInstitute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China Key Laboratory of Beam Technology and Material Modification of Ministry of EducationInstitute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China Key Laboratory of Beam Technology and Material Modification of Ministry of EducationInstitute of Low Energy Nuclear Physics Beijing Normal UniversityBeijing Radiation Center Beijing 100875 China

Nanometer TiN/AlN multilayers were prepared on silicon substrate by filtered vacuum arc *** structures of the nanometer TiN/AlN multilayer were studied by using X-ray diffraction. The 12 nm TiN/AlN multiplayer is composed of cubic TiN structure and hexagonal wurzite AlN structure, but the 2 nm period multilayer is composed of face centered cubic structure TiN and AlN with strong (200) texture. The surface roughness, hardness and elastic modulus of multilayer are dependent on the period of multilayer. The hardness of the TiN/AlN multilayers is higher than that suggested by a simple rule of mixture. The peaking hardness of nanometer TiN/AlN multilayers at period of 2 nm is about 42 GPa, much higher than that of 12 nm. The wear resistance of the nanometer TiN/AlN multilayers was also studied.

关键词： multilayer filtered arc nanometer wear

Theoretic and Experimental Studies on Titania Nanotube Doped with Ag Metal Ions

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 Journal of Structural Chemistry 2011年第9期30卷 1332-1340页

作者：吴先映廖斌梁宏张旭刘安东 key laboratory for radiation beam technology and material modification of ministry of education Institute of Low Energy Nuclear Physics Beijing Radiation Center Beijing Normal University

The electronic state density and energy bands of Ag-doped anatase TiO2 are studied by WIEN2k software package based on DFT. The calculation results show that the band-gap of anatase titania became bigger after doping with Ag metal ions. The band-gap transfers from 2.04 to 2.5 eV, but a new energy band appears among the forbidden band after the Ag atom substitution. The interband width of Ag-TiO2 is 0.17 eV, which is located at –0.07 eV; more excitation and jump routes are opened for the electrons. The lowest excitation energy can achieve 1.2 eV, which may allow the photons with lower energy （at longer wavelength, such as visible light） to be absorbed. Ag ions are implanted into the titania nanotube sample by MEVVA （Metal Vapor Vacuum Arc） implanter. The photo-electrochemical response and photo-degradation experiment of titania nanotube samples implanted with Ag ions are tested under UV and visible light; the results indicated that the performance of implanted titania naotubes is enhanced both under UV and visible light; it is worth mentioning that the photocurrent density can reach 0.145 mA/cm2 under visible light, which is 181 times higher than those of pure TiNT, and the k value of degradation methyl orange can obtain 0.30 h-1, which is 71 times higher than that of pure TiNT. All the experimental results are consistent well with the theoretic ones.

关键词： WIEN2k density functional theory TiO2 nanotube Ag ions doped

Photocatalytic and Photoelectronic Properties of Anatase TiO_2 Modified by Cu Ions Plasma and Its Theoretic Study by the First Principle Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2013年第2期32卷 215-224页

作者：廖斌吴先映梁宏张旭刘安东 key laboratory for radiation beam technology and material modification of ministry of education Institute of Low Energy Nuclear Physics Beijing Radiation Center Beijing Normal University

Highly oxidation. SEM analysis ordered anatase titania nanotube method was used to characterize arrays （TINT） were fabricated by anodic the morphology of the prepared samples. TiNT samples doped with Cu ions were prepared by home-made Metal Vapor Vacuum Arc ions sources （MEVVA, BNU, China） implanter. Photo-electric response and methyl orange decomposition ability of implanted samples under UV and visible light were tested, and the results indicated that the performance of Cu/TiNT enhanced significantly under visible light; it was noteworthy that the photocurrent density of A-Cu/TiNT was 0.102 mA/cm^2, which was 115 times that of pure TINT, and degradation ability of TiNT also strongly enhanced under visible light. In a word, the absorption spectrum of implanted anatase titania shifted to a longer wavelength region. Theoretic study on Cu-doped anatase based on density functional theory was carried out in this paper to validate the experiment results. The calculation results are depicted as follows： Intermittent energy band appeared around the Fermi energy after doping with Cu metal, the width of which was 0.35 eV and the location of valence and conduction bands shifted to the lower energy level by 0.22 eV; more excitation and jump routes were opened for the electrons. The narrowed band gaps allowed the photons with lower energy （at longer wavelength, such as visible light） to be absorbed, which accorded well with the experimental results.

关键词： anatase titania nanotube arrays titania nanofilms Cu ions implanting WIEN2k

Preparation and Photocurrent Performance of Highly Ordered Titania Nanotube Implanted with Ag/Cu Metal Ions

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2010年第7期27卷 221-224页

Ag/Cu-doped titania nanotubes （Ag/TiNT, Cu/TiNT） are prepared by a metal vapor vacuum arc implanter. A scanning electronic microscope is employed for microstruetural characterization. The photo-current performance of doped titania nanotubes under UV and visible light is tested by an electrochemical workstation CS300UA, the results show that the absorption edge of both Ag/TiNT and Cu/TiNT samples shifts to the visible light region and the band gap becomes narrower. Ag/TiNT possesses better photo-current ability than Cu/TiNT under UV and visible light. Titania doped with Ag and Cu metal ions is also studied based on the linearized augmented planewave method implemented by WIEN2k package, the result becomes better with the experimental performance.

关键词： NANOTUBES TITANIUM dioxide METAL ions COPPER ions METAL vapors ION implantation VACUUM

Cellular Response to Irradiation

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

Communications in Theoretical Physics 2011年第5期55卷 921-924页

作者：刘波晏世伟 The key laboratory of beam technology and material modification of ministry of education College of Nuclear Science and TechnologyBeijing Normal University

To explore the nonlinear activities of the cellular signaling system composed of one transcriptional arm and one protein-interaction arm, we use an irradiation-response module to study the dynamics of stochastic interactions. It is shown that the oscillatory behavior could be described in a unified way when the radiation-derived signal and noise are incorporated.

关键词： irradiation soft condensed matter cellular response

Photoluminescence Analysis of Injection-Enhanced Annealing of Electron Irradiation-Induced Defects in GaAs Middle Cells for Triple-Junction Solar Cells

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2016年第5期33卷 67-70页

作者：郑勇易天成肖鹏飞唐娟王荣 key laboratory of beam technology and materials modification of ministry of education College of Nuclear Science and TechnologyBeijing Normal University Beijing radiation Center

Photolumineseenee measurements are carried out to investigate the injection-enhanced annealing behavior of electron radiation-induced defects in a GaAs middle cell for GaInP/GaAs/Ge triple-junction solar cells which are irradiated by 1.8 MeV with a fluence of i ~ 1015 cm-2. Minority-carrier injection under forward bias is observed to enhance the defect annealing in the GaAs middle cell, and the removal rate of the defect is determined with photoluminescenee radiative efficiency recovery. Furthermore, the injection-enhanced defect removal rates obey a simple Arrhenius law. Therefore, the annealing activation energy is acquired and is equal to 0.58eV. Finally, in comparison of the annealing activation energies, the E5 defect is identified as a primary non-radiative recombination center.

关键词： GaAs on cell of Photoluminescence Analysis of Injection-Enhanced Annealing of Electron Irradiation-Induced Defects in GaAs Middle Cells for Triple-Junction Solar Cells in for is

Measurment of the energy spectrum of an electron beam extracted from an accelerator

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2014年第9期23卷 549-555页

作者：胡涛王乃彦 College of Nuclear Science and technology Beijing Normal University China Institute of Atomic Energy key laboratory of beam technology and material modification of ministry of education Beijing Normal University Beijing radiation Center

The electron energy spectrum is one of the most important characteristics of an electron beam that is extracted from a linear accelerator. The most direct way to determine an electron spectrum would be to use a magnetic spectrometer and this method could also give results with high precision and effectiveness. In this article we describe our design of a new multi-layer absorption method, which is based on the depth-dose curves method that can be used in most irradiation accelerators, and adds the Monte Carlo simulation and iterative algorithm in order to reconstruct the electron energy spectrum. In this article the energy spectrum was measured using these two methods, and good results were acquired. These results could be crosschecked, which made the results more reliable.

关键词： electron accelerator electron spectrum magnetic spectrometer multi-layer absorption

Analysis of Accumulating Ability of Heavy Metals in Lotus (Nelumbo nucifera) Improved by Ion Implantation

在线全文

学校读者我要写书评

暂无评论

Plasma Science and technology 2012年第5期14卷 424-426页

作者：张建华王乃彦张丰收 1The key laboratory of beam technology and material modification of ministry ofeducation College of Nuclear Science and TechnologyBeijing Normal University Beijing radiation Center

Heavy metals have seriously contaminated soil and water, and done harm to public health. Academician WANG Naiyan proposed that ion-implantation technique should be exploited for environmental bioremediation by mutating and breeding plants or microbes. By implanting N^＋ into Taikonglian No.l, we have selected and bred two lotus cultivars, Jingguang No.1 and Jingguang No.2. The present study aims at analyzing the feasibility that irradiation can be used for remediation of soil and water from heavy metals. Compared with parent Taikonglian No.l, the uptaking and accumulating ability of heavy metals in two mutated cultivars was obviously improved. So ion implantation technique can indeed be used in bioremediation of heavy metals in soil and water, but it is hard to select and breed a cultivar which can remedy the soil and water from all the heavy metals.

关键词： ion implantation lotus (Nelumbo nucifera) heavy metal improvement