检索结果-南通市图书馆

Effects of silicon addition on optical properties of mould flux with iron oxide and estimation of apparent thermal conductivity of flux

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第4期26卷 365-373页

作者： Rie Endo Yo Kan takashi Watanabe Miyuki Hayashi Masahiro Susa Department of Materials Science and Engineering Tokyo Institute of TechnologyTokyo 152-8552Japan Department of Metallurgy and Ceramics Science Tokyo Institute of TechnologyTokyo 152-8552Japan

Mould flux with high absorptivity had been obtained in the reduction process of mould flux by *** further utilisation of the mould flux with high absorptivity,the effect of silicon addition on the optical property has been *** synthesised mould flux powder with iron oxide was melted with the addition of silicon powder at 1703 K followed by quenching,thus forming a glassy *** 5-30-min reduction,the samples exhibited black opaque ***,the samples that were reduced for 45-60 min had a bluish grey *** iron-based particles dispersed in the samples were micrometre order in *** determine the effect of iron particles on the optical properties of the sample,extinction,scattering and absorption efficiencies were calculated according to Mie *** showed that both scattering on the iron particle and absorption by iron effectively increase the extinction efficiency in the mould ***,the silicon particle in the flux has large scattering *** black opaque colour is contributed by the existence of silicon and iron *** apparent thermal conductivity was calculated for the solid *** also indicated that the entire glassy mould flux would effectively work for mild cooling in a continuous casting process owing to high absorptivity and small thermal conductivity.

关键词： Mould flux Reduction Iron oxide Thermal conductivity Optical property

Geomorphological evidence inconvenient for the antecedent rivers of the Arun and Tista across the Himalayan range

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 Mountain Science 2024年第9期21卷 3001-3017页

作者： NAKATA takashi KUMAHARA Yasuhiro NAIK Sambit Prasanajit SAKAI Harutaka Graduate School of Humanities and Social Sciences Hiroshima UniversityHigashi-Hiroshima 739-8522Japan Active Fault and Earthquake Hazard Mitigation Research Center Pukyong National UniversityBusan 48513South Korea Department of Petroleum Engineering and Earth Sciences University of Petroleum and Energy StudiesDehradun 248007India Graduate School of Science Kyoto UniversityKyoto 606-8502Japan

The Arun and Tista Rivers,which flow across the Himalayas,are commonly known as antecedent valleys that overcame the rapid uplift of the Higher Himalayan *** clarify whether the idea of antecedent rivers is acceptable,we investigated the geomorphology of the Himalayas between eastern Nepal and Bhutan *** southern part of Tibetan Plateau,extending across the Himalayas as tectonically un-deformed glaciated terrain named as'Tibetan Corridor,'does not suggest the regional uplift of the Higher *** 8,000-m class mountains of Everest,Makalu,and Kanchenjunga are isolated residual peaks on the glaciated terrain composed of mountain peaks of 4,000–6,000 m *** Tibetan glaciers commonly beheaded by Himalayan glaciers along the great watershed of the Himalayas suggest the expansion of Himalayan river drainage by *** the narrow upstream regions of the Arun and Tista Rivers with less precipitation behind the range,it is hard to collect enough water for the power of down-cutting their channels against the uplifting *** fission track ages of the Higher Himalayan Crystalline Nappe suggest that the Himalayas attained their present altitude by 11–10 Ma,and the Arun and Tista Rivers formed deep gorges across the Himalayas by headward erosion.

关键词： Himalaya Antecedent river Geomorphology AW3D30 DSM Glacier piracy

Optoelectronic properties of bottom gate-defined in-plane monolayer WSe_2 p–n junction

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第8期27卷 476-481页

作者： Di Liu Xiao-Zhuo Qi takashi Taniguchi Xi-Feng Ren Guo-Ping Guo Key Laboratory of Quantum Information University of Science and Technology of ChinaChinese Academy of SciencesHefei 230026China Synergetic Innovation Center of Quantum Information&Quantum Physics University of Science and Technology of ChinaHefei 230026China National Institute for Materials Science Namiki 1-1Ibaraki 305-0044Japan

Monolayer transition-metal dichalcogenides （TMDs） are considered to be fantastic building blocks for a wide variety of optical and optoelectronic devices such as sensors, photodetectors, and quantum emitters, owing to their direct band gap, transparency, and mechanical flexibility. The core element of many conventional electronic and optoelectronic devices is the p-n junction, in which the p- and n-types of the semiconductor are formed by chemical doping in different regions. Here, we report a series of optoelectronic studies on a monolayer WSe2 in-plane p-n photodetector, demonstrating a low- power dissipation by showing an ambipolar behavior with a reduced threshold voltage by a factor of two compared with the previous results on a lateral electrostatically doped WSe2 p-n junction. The fabrication of the device is based on a polycarbonates （PC） transfer technique and hence no electron-beam exposure induced damage to the monolayer WSe2 is expected. Upon optical excitation, the photodetector demonstrates a photoresponsivity of 0.12 mA.W-1 and a maximum external quantum efficiency of 0.03%. Our study provides an alternative platform for a flexible and transparent two- dimensional photodetector, from which we expect to further promote the development of next-generation optoelectronic devices.

关键词： WSe2, photodetector transfer technique p-n junction

Enhanced electrical property of graphite/Al_(2)O_(3) composite fabricated by reductive sintering of gel-casted body using cross-linked epoxy polymer

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2022年第4期11卷 523-531页

作者： Yoshiaki FUNAHASHI Yunzi XIN Kunihiko KATO Huu Hien NGUYEN takashi SHIRAI Department of Life Science and Applied Chemistry Graduate School of EngineeringNagoya Institute of TechnologyGokiso-choShowa-kuNagoyaAichi 466-8555Japan Advanced Ceramics Research Center Nagoya Institute of TechnologyGokiso-choShowa-kuNagoyaAichi 466-8555Japan

In the present study,graphite/alumina composites are fabricated via reductive sintering of gel-casted green bodies with structurally controlled cross-linked epoxy polymers for the first *** cross-linking degrees of polymers are tuned by the amount ratio of epoxy monomer/polyvinyl alcohol cross-linker utilized in gel-casting *** electrical properties with respect to 5-fold enhanced electrical conductivity and 2-fold higher carrier mobility are successfully achieved in graphite/alumina composite fabricated from cross-linked epoxy polymer,whose phenomenon is attributed to the excellent conductive path in ceramic matrix established by highly uniform network with improved graphitization degree.

关键词： ceramic composite gel-casting reductive sintering cross-linking electrical property graphitization

Correlation between choroidal thickness and intraocular pressure after 23-gauge vitrectomy for idiopathic epiretinal membrane

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2018年第11期11卷 1774-1778页

作者： Masahiro Ishida takashi Wakakuri Yutaka Imamura Department of Ophthalmology Teikyo University School of Medicine University Hospital Mizonokuchi

AIM： To determine the relationship between the subfoveal choroidal thickness（CT） and intraocular pressure（IOP） following idiopathic epiretinal membrane（ERM） ***： Retrospective observational case series of patients who had undergone 23-gauge vitrectomy for an ERM. The measurements of CT and IOP were done at the baseline and 1 d, 1 wk, 1, 3, 6, and 12 mo after the ***： Forty-four eyes of 43 patients with a mean age of 69.8±9.5 y were studied. The CT was 200.8±86.3 μm at the baseline, 210.1±83.5 μm at 1 d, 213.2±85.4 μm at 1 wk, 203.1±84.0 μm at 1 mo, 197.5±85.5 μm at 3 mo, 197.7±84.0 μm at 6 mo, and 191.2±86.8 μm at 12 mo after surgery. The CT on day 1 and week 1 after the surgery was significantly thicker than that at the baseline CT（P=0.0023 and P〈0.0001）. The CT at 12 mo after surgery was significantly thinner than the baseline（P=0.0062）. The IOP on day 1 and week 1 were significantly lower than the baseline（P〈0.0001 and P=0.0042）. The IOP at 1, 3, 6, and 12 mo after surgery were significantly higher than the baseline IOP（P=0.0087, P=0.0023, P〈0.00051, and P〈0.0001）. The rates of changes in the CT between baseline and day 1 and week 1 were significantly and negatively correlated with the rates of change in the IOP（P〈0.0001 and P=0.046）. In the group with the IOP change rate of-30% or less at 1 d postoperatively, the change rate of CT was-21.1% to 31.2%（9.8%±12.4%） and in the group of-29% or more, it was-8.9% to 28.0%（2.6%±8.9%）. The change rate of CT in the group with the IOP change rate of-30% or less was significantly higher than the group of-29% or more（P=0.016）.CONCLUSION： CT increases soon after the ERM surgery which is probably due to the transient hypotony, showing that IOP may be a significant confounding factor for CT.

关键词： choroidal thickness vitrectomy intraocular pressure epiretinal membrane

Certification Criteria in Type I Ecolabelling Related to Metals for Sustainable Materials Management

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 Shanghai Jiaotong university(Science) 2012年第3期17卷 377-379页

作者： ICHIRO Daigo KENICHI Nakajima takashi Fujisaki Graduate School of Engineering The University of TokyoTokyo 113-8656Japan National Institute for Environmental Studies Tsukuba 305-8506Japan Japan Environment Association Tokyo 103-0002Japan

A sustainable materials management for metals should be achieved to conserve resources of metal *** the sustainable materials management,material flows through the whole life cycle of materials have been recognized by material flow analysis(MFA) *** MFA studies pointed out that cyclic use of metals could be enhanced not only by increasing quantity of recovered scrap but also by upgrading quality of the *** general,the quality is degraded by contaminants which commingle at disassembling *** mixture of contaminants depends on usage of materials in ***,Type I ecolabelling has a potential to convey messages for avoiding mixture of contaminants to the producers of finished *** this study,on the basis of a survey on existing certification criteria related to metals in the world,a general concept of certification criteria on sustainable materials management for metals in Type I ecolabelling system is ***,we propose six criteria in the form of certification criteria in Type I ecolabelling system.

关键词： ecolabelling metal recycling certification criteria life cycle thinking design for environment

Numerical Method for Boltzmann Equation with Soroban-Grid CIP Method

在线全文

学校读者我要写书评

暂无评论

Communications in Computational Physics 2007年第4期2卷 760-782页

作者： Youichi Ogata Hyo-Nam Im takashi Yabe Department of Mechanical Sciences and Engineering Tokyo Institute of Technology2-12-1 Meguro-kuOokayama 152-8552Japan.

A new numerical scheme to solve the Boltzmann equation in phase space for rarefied gas is described on the basis of the Cubic Interpolated Propagation(CIP)*** CIP procedure is extended to adaptive unstructured grid system by the Soroban *** grid points in velocity space can move dynamically following the spread of velocity space in a spatially localized *** adaptively moving points in velocity space are similar to the particle codes but can provide higher-orderaccurate *** solutions obtained by the Soroban-grid CIP are examined and the validity is discussed.

关键词： CIP Boltzmann equation Soroban grid.

Gas Absorption by Wavy Falling Liquid Film Formed on Inner Surface of Vertical lubes

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 Thermal Science 2003年第1期12卷 57-61页

作者： Akio Miyara Tomoki Yamamoto Toru Iemura takashi Shimada Department of Mechanical Engineering Saga UniversityGraduate School of Science and Engineering Saga UniversityGraduate School of Science and Engineering Saga UniversityGraduate School of Science and Engineering Saga University 1 Honjomachi Saga-shi 840-8502 Japan 1 Honjomachi Saga-shi 840-8502 Japan1 Honjomachi Saga-shi 840-8502 Japan1 Honjomachi Saga-shi 840-8502 Japan

An experimental study on gas absorption into falling liquid film formed on inner surface of vertical tubes has been carried out in order to clarify fundamental characteristics of the gas absorption and enhancement by surface waves. The water supplied into the test tubes is periodically disturbed by fluctuating a silicon tube before the test section with a speaker and the wavy films absorb the oxygen filled in the tubes. Imposing the periodic disturbance enhances the gas absorption and the enhancement has a maximum at around 20-30 Hz, where the gas absorption is 20-30% higher. Mass transfer coefficients obtained with five tubes agree well with those obtained with single tube. Two-dimensional numerical simulations have also been conducted for gas absorption by wavy film and the enhancement mechanism of the gas absorption is discussed.

关键词： falling liquid film gas absorption surface wave vertical tube mass transfer enhancement.

CT-maximum intensity projection is a clinically useful modality for the detection of gastric varices

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2005年第47期11卷 7515-7519页

作者： Toru Ishikawa takashi Ushiki Ken-ichi mizuno Tadayuki Togashi Kouji Watanabe Kei-ichi Seki Hironobu Ohta Toshiaki Yoshida Keiko Takeda Tomoteru Kamimura Department of Gastroenterology Saiseikai Niigata Second HospitalNiigataJapan Department of Radiology Saiseikai Niigata Second HospitalNiigataJapan

AIM： To evaluate the efficacy of CT-maximum intensity projection （CT-MIP） in the detection of gastric varices and their infiowing and outflowing vessels in patients with gastric varices scheduled to undergo balloonoccluded retrograde transvenous obliteration （B-RTO）. METHODS： Sixteen patients with endoscopically confirmed gastric varices were included in this study. All patients were evaluated with CT-MIP using threedimensional reconstructions, before and after B-RTO. RESULTS： CT-MIP clearly depicted gastric varices in 16 patients （100%）, the left gastric vein in 6 （32.5%）, the posterior gastric vein in 12 （75.0%）, the short gastric veins in 13 （81.3%）, gastrorenal shunts in 16 （100%）, the hemiazygos vein （HAZV） in 4 （25.0%）, the pericardiophrenic vein （PCPV） in 9 （56.3%）, and the left inferior phrenic vein in 9 patients （56.3%）. Although flow direction itself cannot be determined from CT-MIP, this modality provided clear images of the inflowing and the outflowing vessels. Moreover, in one patient, short gastric veins were not seen on conventional angiographic portography images of the spleen, but were clearly revealed on CT-MIP. CONCLUSION： We suggest that CT-MIP should be considered as a routine method for detecting and diagnosing collateral veins in patients with gastric varices scheduled for B-RTO. Furthermore, CT-MIP is more useful than endoscopy in verifying the early therapeutic effects of B-RTO.

关键词： Gastric varices CT-MIP, Portal hypertension