检索结果-南通市图书馆

Optimum sintering conditions for optical properties of translucent aluminum nitride ceramics

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 Science Bulletin 2009年第5期54卷 842-845页

作者： KANECHIKA Yukihiro AZUMA Masanobu fukushima Hiroshi Tokuyama Corp. Graduate School of Engineering Hiroshima University

High translucency is one of the excellent properties of AlN ceramics because of its wide optical band gap energy of 6.2 eV. We have achieved success in producing AlN ceramic tube of 98% total visible light transmittance at 0.6 mm thick tube wall by applying an improved sintering technique. This AlN ceramic was produced by sintering at 1880℃ using Ca3Al2O6 as a sintering additive and in reduction atmosphere to remove the sintering additive from the final sintered material. After the sintering, the annealing with Al2O3 was carried out to improve the transmittance of AlN ceramics. The amount of metal impurities and carbon were 27ppm and 100ppm, respectively. It is noteworthy that the amount of oxygen in AlN ceramics after the annealing was 0.36wt% which was higher than the 0.07wt% of the as-sintered AlN ceramics. Therefore, total transmittance was improved by the oxygen doping. On the other hand, thermal conductivity of AlN after the annealing was lowered by 35% compared with that of as-sintered AlN. Positron Annihilation Lifetime (PAL) measurement was applied to investigation of a relationship between the total transmittance and lattice defects. The present PAL results confirms the presence of negatively charged atomic-size vacancies that is aluminum site vacancies and also sug-gests the increase in the concentration of the vacancies after the annealing compared with that of the as-sintered material. However, it can be concluded that there is no relation between aluminum site va-cancies and the light transmittance of AlN ceramics.

关键词：陶器阳电子湮没铝氮化物半透明性光学性能

Relationships among alcoholic liver disease,antioxidants,and antioxidant enzymes

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2016年第1期22卷 37-49页

作者： Kyu-Ho Han Naoto Hashimoto Michihiro fukushima Department of Food Science Obihiro University of Agriculture and Veterinary MedicineInadaObihiroHokkaido 080-8555Japan Upland Farming Resource Research Division NARO Hokkaido Agricultural Research CenterKasaiHokkaido 082-0071Japan

Excessive consumption of alcoholic beverages is a serious cause of liver disease *** metabolism of ethanol generates reactive oxygen species,which play a significant role in the deterio-ration of alcoholic liver disease(ALD).Antioxidant phytochemicals,such as polyphenols,regulate the expression of ALD-associated proteins and peptides,namely,catalase,superoxide dismutase,glutathione,glutathione peroxidase,and glutathione *** plant antioxidants have electrophilic activity and may induce antioxidant enzymes via the Kelch-like ECH-associated protein 1--NF--E2--related factor--2 pathway and antioxidant responsive ***,these antioxidants are reported to alleviate cell injury caused by oxidants or inflammatory *** phenomena are likely induced via the regulation of mitogen--activating protein kinase(MAPK)pathways by plant antioxidants,similar to preconditioning in ischemia-reperfusion *** the relationship between plant antioxidants and ALD has not been adequately investigated,plant antioxidants may be preventive for ALD because of their electrophilic and regulatory activities in the MAPK pathway.

关键词： Electrophile Mitogen-activating proteinkinase Plant antioxidants reactive oxygen species Preconditioning

Physical and mechanical properties of municipal solid waste incineration residues with cement and coal fly ash using X-ray Computed Tomography scanners

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Structural and Civil Engineering 2019年第3期13卷 640-652页

作者： Toshifumi MUKUNOKI Ta Thi HOAI Daisuke fukushima Teppei KOMIYA Takayuki SHIMAOKA Faculty of Advanced Science and Technology Graduate School of Kumamoto UniversityKumamoto city 860-8555Japan Graduate school of Science and Technology Kumamoto UniversityKumamoto city 860-8555Japan Faculty of Geology VNU University of ScienceVietnam National University Hanoi334 Nguyen TraiHanoiVietnam Water and Material Cycles System Faculty of EngineeringKyushu UniversityFukuoka city 819-0395Japan

A significant volume of Municipal Solid Waste incineration bottom ash and fly ash (i.e.,incineration residues) are commonly disposed as ***,reclamation of landfill sites to create a new land space after their closure becomes an important goal in the current fewer and fewer land availability scenario in many narrow *** objective of this study is to reclaim incineration residue materials in the landfill site by using cement and coal fly ash as stabilizers aiming at performing quality check as new developed materials before future ***,physical and mechanical properties of these new materials should be initially examined at the micro scale,which is the primary fundamental for construction at larger *** research examines quantitative influences of using the combination of cement and coal fly ash at different ratio on the internal structure and ability of strength enhancement of incineration residues when suffering from *** of industrial and micro-focus X-ray computed tomography (CT) scanners combined with an image analysis technique were utilized to characterize and visualize the behavior and internal structure of the incineration residues-cement-coal fly ash mixture under the series of unconfined compression test and curing period *** types of cement solidified incineration residues in term of different curing period (i.e.,7,14,28 days) and coal fly ash addition content (i.e.,0%,9%,18%) were scanned before and after unconfined compression *** was shown that incineration residues solidified by cement and coal fly ash showed an increase in compression strength and deformation modulus with curing time and coal fly ash ***-dimension computed tomography images observation and analysis confirmed that solidified incineration residues including incineration bottom and fly ash as well as cement and coal fly ash have the deliquescent ***,it was studied that stabilized parts play a more im

关键词： mechanical property municipal solid waste incineration residues coal fly ash unconfined compression test image analysis X-Ray Computed Tomography scanners

Revealing the diversity of neutrophil functions and subsets

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2021年第4期18卷 781-783页

作者： Kiyoharu fukushima Hiroshi Nabeshima Hiroshi Kida Department of Respiratory Medicine National Hospital Organization Osaka Toneyama Medical CenterOsakaJapan Department of Respiratory Medicine and Clinical immunology Osaka University Graduate School of MedicineOsakaJapan Laboratory of Host Defense World Premier Institute Im m unology Frontier Research Center(WPIIFReC)Osaka UniversityOsakaJapan Fujii Memorial Research Institute Otsuka Pharmaceutical CompanyLtdShigaJapan

Several recent studies have shown that diverse neutrophil subsets exhibit distinct phenotypic and functional properties in terms of disease onset and progression.1,2 In a study published in Nature Immunology,Sas et al.3 discovered a new neutrophil subset that promotes neuronal survival and axonal regeneration in the central nervous system(CNS).

关键词： neutrophil Immunology

Efects of amine, amine salt and amide on the behaviour of carbon dioxide absorption into calcium hydroxide suspension to precipitate calcium carbonate

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 Environmental Sciences 2013年第12期25卷 2507-2515页

作者： Wittaya Chuajiw Mitsuru Nakano Kazumasa Takatori Toshiya Kojima Yoshiki Wakimoto Yoshiaki fukushima Toyota Technological Institute 2-12-1 HisakataTempaku-kuTenpaku Moon Chome Toyota Central R&D Labs. Inc. Yokomichi Aisin Seiki Co. Ltd.2-1Asahi-machi

The amount of carbon dioxide （CO2） absorption and calcium ion （Ca^2＋） concentration besides the pH of aqueous solution were observed during the COz absorption to precipitate calcium carbonate （CaCO3） from calcium hydroxide （Ca（OH）2）. A reaction rate-limiting effect of an amount of CO2 absorption without any organic additives in the early stage of the precipitation was observed, which was attributed to an interruption effect of bicarbonate ion （HCO3） on the precipitation of CaCO3. The improvement for the reaction rate was achieved not only by amine additives but also by neutral additives such as ε-caprolactam or amine salt. When the hexamethylene diamine was dissolved in the solution, successive change of crystal forms of CaCO3 aragonite to calcite in aqueous suspensions, confirmed by Ca^2＋ concentration change and X-ray diffraction, was concluded that a local environment around the amine group in aqueous solution and an interaction of the diamine with precipitated CaCO3 particles were important factors for these reactions.

关键词： carbon dioxide absorption calcium carbonate precipitation local functional group interaction

Investigation on Temperature Separation and Flow Behaviour in Vortex Chamber

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2015年第2期24卷 149-154页

作者： Yuhi Matsuno Yusuke fukushima Shigeru Matsuo Tokitada Hashimoto Toshiaki Setoguchi Heuy Dong Kim Graduate School of Science and Engineering Saga University Department of Advanced Technology Fusion Saga University Institute of Ocean Energy Saga University School of Mechanical Engineering Andong National University

In the previous researches, it is known that the swirl flow in circular pipe causes the temperature separation. Recently, it is shown that the temperature separation occurs in a vortex chamber when compressed air are pumped into this device from the periphery. Especially, in a cavity installed in the periphery of the chamber, the highest temperature was observed. Therefore, it is expected that this device can be used as a heat source in the engineering field. In recent researches, the mechanism of temperature separation in vortex chamber has been investigated by some researchers. However, there are few researches for the effect of diameter and volume of vortex chamber, height of central rod and position of cavity on the temperature separation. Further, no detailed physical explanation has been made for the temperature separation phenomena in the vortex chamber. In the present study, the effects of chamber configuration and position of the cavity on temperature separation in the vortex chamber were investigated experimentally.

关键词： Compressible flow Vortex chamber Cavity flow Temperature separation

Invariant natural killer T cells and iron metabolism orchestrate skin development and homeostasis

在线全文

学校读者我要写书评

暂无评论

Cellular & Molecular Immunology 2023年第10期20卷 1095-1097页

作者： Hiroshi Nabeshima Takayuki Niitsu Kiyoharu fukushima Hiroshi Kida Laboratory of Host Defense World Premier Institute Immunology Frontier Research Center(WPI-IFReC)Osaka University3-1 YamadaokaSuitaOsakaJapan Department of Respiratory Medicine and Clinical Immunology Osaka University Graduate School of Medicine2-2 YamadaokaSuitaOsakaJapan Department of Host Defense Research Institute for Microbial Diseases(RIMD)Osaka University3-1 YamadaokaSuitaOsakaJapan Department of Respiratory Medicine National Hospital Organization Osaka Toneyama Medical Center5-1-1 ToneyamaOsakaJapan Global Center for Medical Engineering and Informatics 2-2 YamadaokaSuitaOsakaJapan

In recent years,innate-like T-cell populations,such as invariant natural killer T(iNKT)cells and mucosal-associated invariant T(MAIT)cells,have been identified[1].These cells are different from conventional T cells in that they reside in tissues such as the liver,lung,and skin,rather than the lymph node and spleen[2].Although iNKT and MAIT cells are abundant in the skin immediately after birth,the detailed functions or the mechanisms regulating their localization have not been clarified[3].In a study published in Nature Immunology,Wang et *** that the early homing of iNKT cells to the skin was dependent on CCR10 expression during the stage of thymic development and was critical for proper commensal bacterial colonization and skin development[4].

关键词： killer metabolism homeostasis

Effect of equal-channel angular pressing on pitting corrosion resistance of anodized aluminum-copper alloy

在线全文

维普期刊数据库

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 2009年第4期19卷 904-908页

作者： In-Joon SON Hiroaki NAKANO Satoshi OUE Shigeo KOBayaSHI Hisaaki fukushima Zenji HORITA Department of Materials Process Engineering Graduate School of EngineeringKyushu University Department of Materials Science and Engineering Faculty of EngineeringKyushu University Department of Applied Chemistry and Biochemistry Faculty of EngineeringKyushu Sangyo University

The effect of equal-channel angular pressing(ECAP) on the pitting corrosion resistance of anodized Al-Cu alloy was investigated by electrochemical techniques in a solution containing 0.2 mol/L AlCl3 and also by surface *** was conducted for 20 min at 200 and 400 A/m2 in a solution containing 1.53 mol/L H2SO4 and 0.018 5 mol/L Al2(SO4)3·16H2O at 20 ℃.Anodized Al-Cu alloy was immediately dipped in boiling water for 20 min to seal the micro pores present in anodic oxide *** time required before initiating pitting corrosion of anodized Al-Cu alloy is longer with ECAP than without,indicating that ECAP process improves the pitting corrosion resistance of anodized Al-Cu *** phase precipitates such as Si,Al-Cu-Mg and Al-Cu-Si-Fe-Mn intermetallic compounds are present in Al-Cu alloy and the size of these precipitates is greatly decreased by application of ***-Cu-Mg intermetallic compounds are dissolved during anodization,whereas the precipitates composed of Si and Al-Cu-Si-Fe-Mn remain in anodic oxide films due to their more noble corrosion potential than ***-SEM and EPMA observation reveal that the pitting corrosion of anodized Al-Cu alloy occurs preferentially around Al-Cu-Si-Fe-Mn intermetallic compounds,since the anodic oxide films are absent at the boundary between the normal oxide films and these impurity *** improvement of pitting corrosion resistance of anodized Al-Cu alloy processed by ECAP appears to be attributed to a decrease in the size of precipitates,which act as origins of pitting corrosion.

关键词：铝铜合金抗点蚀挤压转角通道

Vitreous hemorrhage and fibrovascular proliferation after laser-induced chorioretinal venous anastomosis

在线全文

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2011年第2期4卷 216-217页

作者： Tomoyasu Shiraya Satoshi Kato Takashi Shigeeda Harumi fukushima Department of Ophthalmology University of Tokyo Graduate School of Medicine

·AIM:To describe a case in which vitrectomy was required for vitreous hemorrhage and fibrovascular proliferation after laser-induced chorioretinal venous anastomosis (LCVA) for non-ischemic central retinal vein occlusion (CRVO).·METHODS:Observational case report.·RESULTS:A 72-year-old man complained of central scotoma in the left eye,and was diagnosed as suffering from non-ischemic *** was performed in another *** favorable visual function was briefly maintained postoperatively,severe vitreous hemorrhage developed in his left eye,necessitating vitrectomy.·CONCLUSION:Considering that LCVA carries a risk of serious complications,we must apply this treatment with caution,especially in ethnic groups,such as the Japanese,in whom pigmentation reacts to photocoagulation excessively.·

关键词： vitreous hemorrhage fibrovascular proliferation laser-induced chorioretinal venous anastomosis non-ischemic central retinal vein occlusion