检索结果-南通市图书馆

Inelastic constitutive equation of plasma-sprayed ceramic thermal barrier coatings

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 161-168页

作者： masayuki ARAI Materials Science Research Laboratory Central Research Institute of Electric Power Industry

Ceramic thermal barrier coatings （TBCs） are a very important technology for protecting the hot parts of gas turbines （GTs） from a high-temperature environment. The coating stress generated in the operation of GTs brings cracking and peeling damage to the TBCs. Thus, it is necessary to evaluate precisely such coating stress in a TBC system. We have obtained a stress-strain curve for a freestanding ceramic coat specimen peeled from a TBC coated substrate by conducting the bending test. The test results have revealed that the ceramic coating deforms nonlinearly with the applied loading. In this study, an inelastic constitutive equation for the ceramic thermal barrier coatings deposited by APS is developed. The obtained results are as follows：（1） the micromechanics-based constitutive equation was formulated with micro crack density formed at splat boundary, and （2） it was shown that the numerical results for a nonlinearly deformed beam simulated by the developed constitutive equation agreed with the experimental results obtained by cantilever bending tests.

关键词： Inelastic constitutive equation Thermal barrier coating Gas turbine Micromechanics

Fluidization science,its development and future

在线全文

学校读者我要写书评

暂无评论

Particuology 2010年第6期8卷 514-524页

作者： masayuki Horio Department of Politics Ryukoku University RISTEX Japan Science and Technology AgencyKojimachi Square 5F3 Niban-choChiyoda-kuTokyo 102-0084Japan

By revisiting the three stage theory for the progress of science proposed by Taketani in 1942, the footmarks of fluidization research are examined. The bubbling and fast fluidization issues were emphasized so that the future offluidization research can be discussed among scientists and engineers in a wider perspective. The first cycle of fluidization research was started in the early 1940s by an initial stage of phenomenology. The second stage of structural studies was kicked off in the early 1950s with the introduction of the two phase theory. The third stage of essential studies occurred in the early 1960s in the form of bubble hydrodynamics. The second cycle, which confirmed the aforementioned three stages closed at the turn of the century, established a general understanding of suspension structures including agglomerating fluidization, bubbling, turbulent and fast fluidizations and pneumatic transport; also established powerful measurement and numerical simulation *** a general remark on science, technology and society issues the interactions between fluidization technology and science are revisited. Our future directions are discussed including the tasks in the third cycle, particularly in its phenomenology stage where strong motivation and intention are always necessary, in relation also to the green reforming of the present technology. A generalized definition of ＇fluidization＇ is proposed to extend fluidization principle into much wider scientific fields, which would be effective also for wider collaborations.

关键词： Historical development of fluidization Science and society Taketani's three step law Paradigm shift Fluid catalytic cracking Phase transition Bubbling bed Fast fluidization Cluster Future direction

Recent standardization of treatment strategy for pancreatic neuroendocrine tumors

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2010年第36期16卷 4519-4525页

作者： masayuki Imamura Department of Surgey Kansai Denryoku Hospital2-1-7FukushimaFukushima-KuOsaka 553-0003Japan

Recent advances in localization techniques,such as the selective arterial secretagogue injection test(SASI test) and somatostatin receptor scintigraphy have promoted curative resection surgery for patients with pancreatic neuroendocrine tumors(PNET).For patients with sporadic functioning PNET,curative resection surgery has been established by localization with the SASI test using secretin or *** curative resection of functioning PNET associated with multiple endocrine neoplasia type 1(MEN 1) which are usually multiple and sometimes numerous,resection surgery of the pancreas and/or the duodenum has to be performed based on localization by the SASI *** resection surgery of PNET has increased,several important pathological features of PNET have been *** example,in patients with Zollinger-Ellison syndrome(ZES),duodenal gastrinoma has been detected more frequently than pancreatic gastrinoma,and in patients with MEN 1 and ZES,gastrinomas have been located mostly in the duodenum,and pancreatic gastrinoma has been found to co-exist in 13% of *** PNET in patients with MEN 1 becomes metastatic to the liver when it is more than 1 cm in diameter and should be resected after careful *** most important prognos-tic factor in patients with PNET is the development of hepatic *** treatment strategy for hepatic metastases of PNET has not been established and aggressive resection with chemotherapy and trans-arterial chemoembolization have been performed with significant *** usefulness of octreotide treatment and other molecular targeting agents are currently being assessed.

关键词： Gastrinoma Glucagonoma Insulinoma Multiple endocrine neoplasia type 1 Octreotide Pancreas preserving total duodenectomy Pancreatic neuroendocrine tumors Selective arterial secretagogue injection test Somatostatin receptor scintigraphy

Increasing spatial coverage in rough terrain and vegetated areas using InSAR optimized pixel selection:application to Tohoku,Japan

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2022年第2期25卷 295-311页

作者： Tamer ElGharbawi masayuki Tamura Civil and Earth Resources Engineering Department Kyoto UniversityKyotoJapan

One of the major limitations of using Interferometric Synthetic Aperture Radar(InSAR)in time series analysis is the low-phase coherence associated with rough terrain and vegetated areas,which results in limited spatial coverage in such *** scatterers technique was introduced to overcome this limitation using time-series ***,identifying major scatterers within a pixel requires the single-looked pixels oversampling which can be a demanding process especially with large interferometric stacks and vast study ***,using multilooked temporal coherent pixels was proposed to increase processing efficiency and coverage by utilizing distributed targets,but this technique may exclude pixels with reliable phase returns because of their temporal varying neighboring *** this paper,we propose a technique to identify multilooked temporal stable pixels with reliable phase returns independent of their neighboring *** conduct a simulation analysis to relate the spatial coherence of a pixel with its expected temporal correlation in the time series analysis *** found that a liberal temporal correlation threshold of 0.53 in multilooked pixels stack is equivalent to a spatial coherence threshold of 0.2 when using number of looks of 9,which is considered acceptable in temporal coherent pixels,in terms of phase standard *** these findings to study the 2011 Tohoku earthquake in the northeastern part of Japan resulted in increasing the number of usable pixels and spatial coverage index by nearly 50.4%and 36.8%,respectively,compared to the temporal coherent ***,we propose an approach to integrate GPS observations with InSAR time series analysis,which resulted in deformation maps of the megathrust 2011 Tohoku earthquake with mean RMSE of 11.4 mm and a correlation of 98%in comparison to GPS observations.

关键词： 2011 Tohoku earthquake temporal stable pixels coherence phase noise GPS coverage index

High-Efficiency Synthesis and Properties of Latent Pigment Red 272DPP-BOC by Microwave Irradiation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Materials Sciences and Applications 2020年第3期11卷 195-203页

作者： Tomoji ohishi Yu Kimura Kiyohiko Nakajima masayuki Watanabe Noboru Aoyagi Department of Applied Chemistry Faculty of Engineering Shibaura Institute of Technology Tokyo Japan Department of Chemistry Aichi University of Education Kariya Japan Nuclear Science and Engineering Center Sector of Nuclear Science Research Japan Atomic Energy Agency Naka-gun Ibaraki Japan

A high-efficiency synthesis method for a latent pigment of red pigment diketo-pyrrolo-pyrrole (Pig. Red 272:272DPP), which is important as a functional organic pigment, was investigated, and the investigation results revealed that irradiation of microwaves (MWs) for several seconds to 272 DPP in NMP (N-methyl-2-pyrrolidone) solvent yielded DPP latent pigment (272DPP-BOC) at a high yield of 86.2%. Two kinds of latent-pigment crystals, namely, red and yellow, were obtained by recrystallization, and it was found that the fluorescence-emission properties of the two kinds differ significantly. Single-crystal X-ray structural analysis showed that the difference in the fluorescence-emission properties of the two types is derived from the difference in their crystal structures.

关键词： Latent Pigment Diketopyrrolopyrrol Pigment Red 272 High Efficiency Synthesis Microwave Irradiation Single-Crystal X-Ray Analysis

Effect of Boundary Layer Trip on Reduction of Jet Noise in Over-Expanded Nozzle Flow

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 2017年第5期26卷 448-452页

作者： masayuki ANYOJI Issei TABARU Interdisciplinary Graduate School of Engineering Sciences Kyushu University 6-1 Kasuga-koen Kasuga-city Fukuoka Japan Department of Energy and Environmental Engineering Kyushu University 6-1 Kasuga-koen Kasuga-city FukuokaJapan

A flow resonance accompanied by the emission of acoustic tones occurs in an over-expanded convergent-divergent(C-D) nozzle when operated at comparatively low pressure ratios. This phenomenon is distinguished from conventional screech tones and is referred to as "transonic tones". In contrast to screech tones, the peak resonant frequency for transonic tones increases with pressure ratio; the peak sound pressure level exceeds 110 d B. In this study, we investigated the basic characteristics of transonic resonance and tones using a circular C-D nozzle in an anechoic room. The effects of the boundary layer trip were also evaluated using a tripping wire for the suppressing transonic resonance and tones. The results of acoustic measurements show that several predominant peaks correspond to transonic tones. However, the boundary layer trip inside the nozzle effectively eliminated these tones and suppressed the unsteadiness of the flow inside the nozzle.

关键词： Transonic tones convergent-divergent nozzle noise reduction boundary layer trip

Recent Development of Steelmaking Process in Sumitomo Metals

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2011年第S2期18卷 28-35页

作者： masayuki Kawamoto Sumitomo Metal Industries Ltd.1-8-11 Harumi Chuo-ku Tokyo 104-6111Japan

Sumitomo Metal *** the third place steelmaking company for productivity in ***,we have some first Japanese innovations results in steelmaking *** this report,SRP process and some topics for continuous casting have bee... 详细信息

关键词： SRP SSC PCCS AI nozzle continuous casting steelmaking

Characteristics of gas-liquid pulsed discharge plasma reactor and dye decoloration efficiency

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2012年第5期24卷 840-845页

作者： Nyein Nyein Aye masayuki Sato Environmental Science and Engineering College Dalian Maritime University

The pulsed high-voltage discharge is a new advanced oxidation technology for water treatment. Methyl Orange （MO） dye wastewater was chosen as the target object. Some investigations were conducted on MO decoloration including the discharge characteristics of the multi-needle reactor, parameter optimization, and the degradation mechanism. The following results were obtained. The color group of the azo dye MO was effectively decomposed by water surface plasma. The decoloration rate was promoted with the increase of treatment time, peak voltage, and pulse frequency. When the initial conductivity was 1700 μS/cm, the decoloration rate was the highest. The optimum distance between the needle electrodes and the water surface was 1 mm, the distance between the grounding electrode and the water surface was 28 mm, and the number of needle electrodes and spacing between needles were 24 and 7.5 mm, respectively. The decoloration rate of MO was affected by the gas in the reactor and varied in the order oxygen 〉 air〉 argon 〉 nitrogen, and the energy yield obtained in this investigation was 0.45 g/kWh.

关键词： multi-needle plasma reactor water surface plasma decoloration efficiency Methyl Orange decoloration

Molecular phylogenetic relationships of Eastern Asian Cyprinidae(Pisces:Cypriniformes)inferred from cytochrome b sequences

在线全文

学校读者我要写书评

暂无评论

Science China(Life Sciences) 2004年第2期47卷 130-138页

作者： masayuki Kuwahara Tsuneo Nakajima Lake Biwa Museum 1091 Oroshimo Kusatsu Shiga 525 JapanLake Biwa Museum 1091 Oroshimo Kusatsu Shiga 525 Japan

Complete mitochondrial cytochrome b sequences of 54 species, including 18 newly sequenced, were analyzed to infer the phylogenetic relationships within the family Cyprinidae in East Asia. Phylogenetic trees were generated using various tree-building methods, including Neighbor-joining (NJ), Maximum Parsimony (MP) and Maximum Likelihood (ML) methods, with Myxocyprinus asiaticus (family Catostomidae) as the designated outgroup. The results from NJ and ML methods were mostly similar, supporting some existing subfamilies within Cyprinidae as monophyletic, such as Cultrinae, Xenocyprinae and Gobioninae (including Gobiobotinae). How-ever, genera within the subfamily 揇anioninae?did not form a monophyletic group. The subfamily Leuciscinae was divided into two unrelated groups: the Leuciscinae in East Asia forming as a monophyletic group together with Cultrinae and Xenocyprinae, while the Leuciscinae in Europe, Siberia, and North America as another monophyletic group. The monophyly of subfamily Cy-prininae sensu Howes was supported by NJ and ML trees and is basal in the tree. The position of Acheilognathinae, a widely accepted monophyletic group represented by Rhodeus sericeus, was not resolved.

关键词： Cyprinidae, cytochrome b, molecular phylogeny, Pisces.