检索结果-内蒙古大学图书馆

Simple Vacuum Evaporation Route to BaSi 2 Thin Films for Solar Cell Applications

Procedia Engineering 2016年 141卷 27-31页

作者： Kosuke O. Hara Yoshihiko Nakagawa Takashi Suemasu Noritaka Usami Center for Crystal Science and Technology University of Yamanashi 7-32 Miyamae Kofu Yamanashi 400-8511 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Agency Gobancho Chiyoda Tokyo 102-0075 Japan Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Institute of Applied Physics University of Tsukuba 1-1-1 Tennohdai Tsukuba Ibaraki 305-8573 Japan

The BaSi 2 semiconductor has excellent optoelectronic properties for solar cell applications and consists of earth-abundant elements. In this study, we have investigated the thin film growth of BaSi 2 by a simple vacuum evaporation technique. It is shown by X-ray diffraction that single-phase BaSi 2 films can be formed at high substrate temperatures of 500 and 600 ˚C on either Si(111) or EAGLE XG glass substrate. The film growth mechanism is discussed on the basis of the transmission electron microscopy observation and energy-dispersive X-ray spectra of the film and the residue of evaporation source. It is concluded that high substrate temperatures are needed to remove excess Ba atoms and to eliminate a composition gradient. In addition, suitable optical properties for solar cell applications are revealed by analyzing the transmittance and reflectance spectra.

关键词： Silicide semiconductor vacuum evaporation crystal growth optical properties

来源：评论

学校读者我要写书评

暂无评论

Development of high-efficient proton conductor nanochannels array based on ferroelectric material 19

Development of high-efficient proton conductor nanochannels ...

引用

19th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2015

作者： Seo, H. Pihosh, Y. Kazoe, Y. Mawatari, K. Kitamura, K. Tabata, O. Tsuchiya, T. Kitamori, T. University of Tokyo Department of Applied Chemistry School of Engineering Japan Japan Science and Technology Agency Core Research for Evolutional Science and Technology Japan National Institute for Materials Science Optoelectronic Materials Group Japan Kyoto University Department of Micro Engineering Japan

ISBN: (纸本)9780979806483

In this work, we report on the possibility of controlling the surface potential of extended-nano channels (ENCs) made in a system of SiO2/LiNbO3 (LN), which can promote improvement of the proton diffusion rate. We detected the optimal thickness of a SiO2 film which is ∼ 5 nm, where the deposited material would not affect spontaneous polarization of the LN material, which results in enhanced protontransport in ENCs. Here, we describe the device concept, the effect of SiO2 thickness on the LN surface potential, demonstrate the device working principle and show its enhancement of 2.5 times in proton diffusion in comparison to the balk value. © 15CBMS-0001.

关键词： Surface potential

来源：评论

学校读者我要写书评

暂无评论

Cartan symmetries and global dynamical systems analysis in a higher-order modified teleparallel theory

arXiv

引用

arXiv 2017年

作者： Karpathopoulos, L. Basilakos, S. Leon, G. Paliathanasis, A. Tsamparlis, M. Faculty of Physics Department of Astronomy-Astrophysics-Mechanics University of Athens Panepistemiopolis Athens157 83 Greece Academy of Athens Research Center for Astronomy and Applied Mathematics Soranou Efesiou 4 Athens11527 Greece Departamento de Matemáticas Universidad Católica del Norte Avda. Angamos 0610 Casilla Antofagasta1280 Chile Instituto de Ciencias Físicas y Matemáticas Universidad Austral de Chile Valdivia Chile Department of Mathematics and Natural Sciences Core Curriculum Program Prince Mohammad Bin Fahd University Al Khobar31952 Saudi Arabia Institute of Systems Science Durban University of Technology PO Box 1334 Durban4000 South Africa

In a higher-order modified teleparallel theory cosmological we present analytical cosmological solutions. In particular we determine forms of the unknown potential which drives the scalar field such that the field equations form a Liouville integrable system. For the determination of the conservation laws we apply the Cartan symmetries. Furthermore, inspired from our solutions, a toy model is studied and it is shown that it can describe the Supernova data, while at the same time introduces dark matter components in the Hubble function. When the extra matter source is a stiff fluid then we show how analytical solutions for Bianchi I universes can be constructed from our analysis. Finally, we perform a global dynamical analysis of the field equations by using variables different from that of the Hubble-normalization. Copyright © 2017, The Authors. All rights reserved.

关键词： Cosmology

来源：评论

学校读者我要写书评

暂无评论

Ultrahigh exciton diffusion in intrinsic diamond

引用

Physical Review B 2015年第20期92卷 201202(R)-201202(R)页

作者： Hikaru Morimoto Yuji Hazama Koichiro Tanaka Nobuko Naka Department of Physics Kyoto University Kitashirakawa-Oiwake-cho Sakyo-ku Kyoto 606-8502 Japan Institute for Integrated Cell-Material Sciences (WPI-iCeMS) Kyoto University Kyoto 606-8501 Japan Core Research for Evolutional Science and Technology (CREST) JST Kyoto 606-8502 Japan

We observe exceptionally high diffusion of excitons in diamond using time-resolved photoluminescence imaging. The diffusivity is found to increase with decreasing temperature more rapidly than well-established predictions. The highest diffusion constant, 9.2×103cm2/s, measured for thermalized excitons is 150 times that recorded previously in diamond. We elucidate the momentum relaxation mechanisms determining transport: intraband and interband scattering by acoustic phonons in the exciton fine-structure levels. The enhanced diffusivity above 100 K is explained by a free-carrier contribution.

关键词： DIAMONDS DIFFUSION NATIVE element minerals SEPARATION (technology) EXCITON theory

来源：评论

学校读者我要写书评

暂无评论

Interconversion between formate and hydrogen carbonate by tungsten-containing formate dehydrogenase-catalyzed mediated bioelectrocatalysis

引用

Sensing and Bio-Sensing research 2015年 5卷 90-96页

作者： Sakai, Kento Hsieh, Bo-Chuan Maruyama, Akihiro Kitazumi, Yuki Shirai, Osamu Kano, Kenji Division of Applied Life Sciences Graduate School of Agriculture Kyoto University Sakyo Kyoto 606-8502 Japan Department of Bio-Industrial Mechatronics Engineering College of Bio-Resources and Agriculture National Taiwan University Taipei 10617 Taiwan Core Research for Evolutional Science and Technology (Crest) Japan Science and Technology Agency (JST) Chiyoda Tokyo 102-00076 Japan

We have focused on the catalytic properties of tungsten-containing formate dehydrogenase (FoDH1) from Methylobacterium extorquens AM1 to construct a bioelectrochemical interconversion system between formate (HCOO^-) and hydrogen carbonate (HCO₃^-). FoDH1 catalyzes both of the HCOO oxidation and the HCO₃^- reduction with several artificial dyes. The bi-molecular reaction rate constants between FoDH1 and the artificial electron acceptors and NAD⁺ (as the natural electron acceptor) show the property called a linear free energy relationship (LFER), indicating that FoDH1 would have no specificity to NAD⁺. Similar LFER is also observed for the catalytic reduction of HCO₃^-. The reversible reaction between HCOO^- and HCO₃^- through FoDH1 has been realized on cyclic voltammetry by using methyl viologen (MV) as a mediator and by adjusting pH from the thermodynamic viewpoint. Potentiometric measurements have revealed that the three redox couples, MV²⁺/MV⁺, HCOO^-/HCO₃^-, FoDH1 (ox/red), reach an equilibrium in the bulk solution when the two-way bioelectrocatalysis proceeds in the presence of FoDH1 and MV. The steady-state voltammograms with two-way bioelectrocatalytic properties are interpreted on a simple model by considering the solution equilibrium. © 2015 The Authors.

关键词： Bioelectrocatalytic potentiometry CO2 reduction Formate oxidation Reversible bioelectrocatalysis Tungsten-containing formate dehydrogenase

来源：评论

学校读者我要写书评

暂无评论

Experimental search for the electron electric dipole moment with laser cooled francium atoms

引用

Hyperfine Interactions 2015年第1-3期231卷 157-162页

作者： Inoue, T. Ando, S. Aoki, T. Arikawa, H. Ezure, S. Harada, K. Hayamizu, T. Ishikawa, T. Itoh, M. Kato, K. Kawamura, H. Uchiyama, A. Aoki, T. Asahi, K. Furukawa, T. Hatakeyama, A. Hatanaka, K. Imai, K. Murakami, T. Nataraj, H.S. Sato, T. Shimizu, Y. Wakasa, T. Yoshida, H.P. Yoshimi, A. Sakemi, Y. Frontier Research Institute of Interdisciplinary Sciences Tohoku University 6-3 Aoba Aramaki Aoba-ku Sendai Miyagi980-8578 Japan Cyclotron and Radioisotope Center Tohoku University Miyagi Japan Graduate School of Arts and Sciences University of Tokyo Tokyo Japan Department of Physics Tokyo Institute of Technology Tokyo Japan Department of Physics Tokyo Metropolitan University Tokyo Japan Department of Applied Physics Tokyo University of Agriculture and Technology Tokyo Japan Research Center for Nuclear Physics Osaka University Osaka Japan Advanced Science Research Center Japan Atomic Energy Agency Ibaraki Japan Department of Physics Kyoto University Kyoto Japan Indian Institute of Technology Roorkee Uttarakhand India Department of Physics Tohoku University Miyagi Japan Department of Physics Kyushu University Fukuoka Japan Research Core for Extreme Quantum World Okayama University Okayama Japan

A laser cooled heavy atom is one of the candidates to search for the permanent electric dipole moment (EDM) of the electron due to the enhancement mechanism and its long coherence time. The laser cooled francium (Fr) factory has been constructed to perform the electron EDM search at the Cyclotron and Radioisotope Center, Tohoku University. The present status of Fr production and the EDM measurement system is presented. © 2014, The Author(s).

关键词： Laser cooling

来源：评论

学校读者我要写书评

暂无评论

Control of mesoscopic transport by modifying transmission channels in opaque media

引用

Physical Review B 2015年第21期92卷 214206-214206页

作者： Raktim Sarma Alexey Yamilov Seng Fatt Liew Mikhael Guy Hui Cao Department of Applied Physics Yale University New Haven Connecticut 06520 USA Department of Physics Missouri University of Science and Technology Rolla Missouri 65409 USA Science Research Software Core Yale University New Haven Connecticut 06520 USA

While controlling particle diffusion in a confined geometry is a popular approach taken by both natural and artificial systems, it has not been widely adopted for controlling light transport in random media, where wave interference effects play a critical role. The transmission eigenchannels determine not only light propagation through the disordered system but also the energy concentrated inside. Here, we propose and demonstrate an effective approach to modify these channels, whose structures are considered to be universal in conventional diffusive waveguides. By adjusting the waveguide geometry, we are able to alter the spatial profiles of the transmission eigenchannels significantly and deterministically from the universal ones. In addition, evanescent channels may be converted to propagating channels by gradually increasing the waveguide cross-section. Our approach allows to control not only the transmitted and reflected light, but also the depth profile of energy density inside the scattering system. In particular geometries, perfect reflection channels are created, and their large penetration depth into the turbid medium as well as the complete return of probe light to the input end would greatly benefit sensing and imaging applications. Absorption along with geometry can be further employed for tuning the decay length of energy flux inside the random system, which cannot be achieved in a common waveguide with uniform cross-section. Our approach relies solely on confined geometry and does not require any modification of intrinsic disorder, thus it is applicable to a variety of systems and also to other types of waves.

关键词： Transport phenomena Nanostructures Random & disordered media

来源：评论

学校读者我要写书评

暂无评论

Integrated heat pipe device using enhanced capillary condensation and high laplace pressure in extended nanospace 18

Integrated heat pipe device using enhanced capillary condens...

引用

18th International Conference on Miniaturized Systems for Chemistry and Life sciences, MicroTAS 2014

作者： Wang, Chenxi Kazoe, Yutaka Morikawa, Kyojiro Shimizu, Hisashi Kasai, Kentaro Mawatari, Kazuma Kitamori, Takehiko Department of Applied Chemistry University of Tokyo Japan Japan Science and Technology Agency Core Research for Evolutional Science and Technology Japan

ISBN: (纸本)9780979806476

An integrated heat pipe device based on enhanced condensation speed and high driving Laplace pressure in extended-nano space (101-103 nm scale) is developed for a non-electric cooling. To verify the working principle, streaming potential measurements between the evaporator and condenser are carried out. This method provides a promising tool for the investigation of vapor-liquid phase transition in the extended-nano space. Liquid circulation between the evaporator and condenser are evaluated quantitatively demonstrating the extended-nano heat pipe working properly for the first time. It has great potentials for realization of high-performance cooling devices. © 14CBMS.

关键词： Heat pipes

来源：评论

学校读者我要写书评

暂无评论

Publisher's Note: "Evaluation of a flat-field grazing incidence spectrometer for highly charged ion plasma emission in soft x-ray spectral region from 1 to 10 nm" [Rev. Sci. Instrum. 87, 123106 (2016)]

引用

The Review of scientific instruments 2017年第2期88卷 029902页

作者： Thanh Hung Dinh Yoshiki Kondo Toshiki Tamura Yuichi Ono Hiroyuki Hara Hiroki Oikawa Yoichi Yamamoto Masahiko Ishino Masaharu Nishikino Tetsuya Makimura Padraig Dunne Gerry O'Sullivan Shigeru Ohta Ken Kitano Takeo Ejima Tadashi Hatano Takeshi Higashiguchi Department of Electrical and Electronic Engineering Faculty of Engineering and Center for Optical Research and Education (CORE) Utsunomiya University 7-1-2 Yoto Utsunomiya Tochigi 321-8585 Japan. Kansai Photon Science Institute National Institutes for Quantum and Radiological Science and Technology (QST) 8-1-7 Umemidai Kizugawa Kyoto 619-0215 Japan. Institute of Applied Physics University of Tsukuba Tsukuba Ibaraki 305-8573 Japan. School of Physics University College Dublin Belfield Dublin 4 Ireland. Vacuum and Optical Instruments 2-18-18 Shimomaruko Ohta-ku Tokyo 146-0092 Japan. Institute of Multidisciplinary Research for Advanced Materials Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan.

This article was originally published online on 20 December 2016 with the 16th author’s name appearing as “Hatano Tadashi”. It should have been “Tadashi Hatano”

关键词：

来源：评论

学校读者我要写书评

暂无评论

From Cyano-aromatic Molecules to Nitrogen-doped Carbons by Solution Plasma for the Oxygen Reduction Reaction in Alkaline Medium

引用

Materials Today: Proceedings 2015年第8期2卷 4302-4308页

作者： Gasidit Panomsuwan Nagahiro Saito Takahiro Ishizaki Department of Materials Science and Engineering Faculty of Engineering Shibaura Institute of Technology 3-7-5 Toyosu Koto-ku Tokyo 135-8548 Japan Department of Materials Physics and Energy Enginneering Grauate School of Engineering Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Green Mobility Collaborative Research Center Nagoya University Furo-cho Chikusa-ku Nagoya 464-8603 Japan Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan

Nitrogen-doped carbon nanoparticles (NCNPs) were synthesized by a solution plasma process followed by a thermal annealing at 900 °C. Cyano-aromatic molecules, including cyanobenzene (C 7 H 5 N), 2-cyanopyridine (C 6 H 4 N 2 ), and cyanopyrazine (C 5 H 3 N 3 ), were used as single source precursors for the synthesis. The morphological features of NCNPs were governed by the aggregates and agglomerates of uniform nanosized particles (20−40 nm). The structural analyses confirmed that NCNPs mainly exhibited a disordered amorphous carbon structure. The nitrogen doping contents determined from an X-ray photoelectron spectroscopy were found to be 0.58, 1.36, and 1.29 at% for NCNPs synthesized from cyanobenzene, 2-cyanopyridine, and cyanopyrazine, respectively. The improvements of oxygen reduction reaction activity and selectivity toward a four-electron pathway in an alkaline solution of NCNPs were correlated with the nitrogen doping content and nitrogen bonding state. The NCNPs also possessed excellent long-term durability and strong methanol tolerance in an alkaline solution compared to those of a commercial Pt/carbon catalyst.

关键词： Nitrogen-doped carbons Oxygen reduction reaction Electrocatalysts Solution plasma process

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：