检索结果-南通市图书馆

Influence of the Position of the Fermi Level on an Infrared Active Defect in Irradiated Silicon

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1995年第5期12卷 289-292页

作者： SHI Yi WU Fengmei ZHENG Youdou SUEZAWA Masashi SUMINO koji Department of Physics Nanjing UniversityNanjing 210093 Institute for Materials Research Tohoku UniversitySendai 980Japan

Influence of the position of the Fermi level on the infrared active defect,so-called higher order bands(HOB),has been investigated in neutron irradiated silicon by using infrared absorption and Hall-effect measurements at low *** optical excitation and the introduction of thermal donors(TD)effectively alter the position of the Fermi *** optically active behaviors between the HOB and TD^(+) have been *** is suggested strongly that the mechanism of the Fermi level influencing on the HOB is the same as that of the TD^(+).

关键词： Fermi Infrared excitation

High-strain-rate superplasticity in oxide ceramics:a trial of microstructural design based on creep-cavitation mechanisms

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3期24卷 195-204页

作者： Keijiro HIRAGA Byung-Nam KIM koji MORITA Hidehiro YOSHIDA Yoshio SAKKA Masaaki TABUCHI National Institute for Materials Science

From existing knowledge about high-temperature cavitation mechanisms, necessary conditions were discussed for the suppression of cavitation failure during superplastic deformation in ceramic materials. The discussion, where special attention was placed on the relaxation of stress concentrations during grain-boundary sliding and cavity nucleation and growth, leaded to a conclusion that cavitation failure could be retarded by the simultaneous controlling of the initial grain size, the number of residual defects, diffusivity, dynamic grain growth and the homogeneity of microstructure. On the basis of this conclusion, high-strain-rate superplasticity （defined as superplasticity at a strain rate higher than 0.01 s^-1） could be intentionally attained in some oxide ceramic materials. This was shown in tetragonal zirconia and composites consisting of zirconia, a-alumina and a spinel phase.

关键词： Grain-boundary sliding Accommodation Stress concentration Diffusional relaxation Cavity nucleation Cavity growth Dynamic grain growth

Dermatomyositis associated with hepatocellular carcinoma in an elderly female patient with hepatitis C virus-related liver cirrhosis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第10期12卷 1641-1644页

作者： Nobuyuki Toshikuni Rikako Torigoe Mikio Mitsunaga Akiyoshi Omoto koji Nakashima Department of Internal Medicine Ako Central Hospital AkoJapanDepartment of Internal MedicineHimeji Red Cross HospitalHimejiJapan Department of Dermatology Ako Central Hospital AkoJapan Department of Internal Medicine Ako Central Hospital AkoJapan

A 79-year-old female patient with hepatitis C virusrelated liver cirrhosis was diagnosed as having hepatocellular carcinoma （HCC） with a diameter of 2.0 cm. She refused therapy for HCC. Nine months after the diagnosis, she developed dermatomyositis when the HCC enlarged to a diameter of 6.0 cm. She underwent therapy for dermatomyositis, and then transcatheter arterial chemoembolization for HCC. Although the manifestations of dermatomyositis improved and entire tumor necrosis was achieved, she died of pneumonia 2 mo after the treatment of HCC. HCC and/or chronic hepatitis C virus infection might be involved in the pathogenesis of dermatomyositis.

关键词： Dermatomyositis Hepatocellular carcinoma Hepatitis C virus

Non-Fourier heat conduction study for steady states in metallic nanofilms

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 2012年第24期57卷 3239-3243页

作者： WANG HaiDong LIU JinHui GUO ZengYuan TAKAHASHI koji Key Laboratory for Thermal Science and Power Engineering of Ministry of Education School of AerospaceTsinghua UniversityBeijing 100084China Graduate School of Engineering Kyushu UniversityFukuoka 819-0395Japan

As a fundamental theory of heat transfer, Fourier's law is valid for most traditional conditions. Research interest in non-Fourier heat conditions is mainly focused on heat wave phenomena in non-steady states. Recently, the thermomass theory posited that, for steady states, non-Fourier heat conduction behavior could also be observed under ultra-high heat flux conditions at low ambient temperatures. Significantly, this is due to thermomass inertia. We report on heat conduction in metallic nanofilms from large currents at low temperatures; heat fluxes of more than 1×1010 W m 2 were used. The measured average temperature of the nanofilm is larger than that based on Fourier's law, with temperature differences increasing as heat flux increased and ambient temperature decreased. Experimental results for different film samples at different ambient temperatures reveal that non-Fourier behavior exists in metallic nanofilms in agreement with predictions from thermomass theory.

关键词：非傅立叶热传导非稳定状态纳米薄膜金属低环境温度 Fourier 傅立叶定律高热通量

Long-term survival of a case with multiple liver metastases from duodenal gastrointestinal stromal tumor drastically reduced by the treatment with imatinib and hepatectomy

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第17期12卷 2793-2797页

作者： Chouhei Sakakura Akeo Hagiwara koji Soga koji Miyagawa Susumu Nakashima Tetsuji Yoshikawa Shuichi Kin Yuenn Nakase Nobuki Yamaoka Yoshihiko Sagara Hisakazu Yamagishi Department of Digestive Surgery Kyoto Prefectural University of Medicine Kawaramachi-doriKamigyokuKyoto 602-0841Japan

Constitutive activation of KIT receptor tyrosine kinase is a critical factor in the pathogenesis of gastrointestinal stromal tumors （GISTs）. But there is little information on whether combination of imatinib mesylate （IM） and surgical treatment can prolong survival in the cases with unresectable multiple liver metastases. We report a case of postoperative recurrence of GIST treated by the tyrosine kinase inhibitor IN and surgical treatment. The initial complete response （CR） to treatment continued for 18 mo, but single liver metastasis showed regrowth in the left hepatic lobe during IN treatment. After partial resection of the recurrent tumor, postoperative course was uneventful and the patient has survived without recurrence for 24 too. Currently, imatinib is the first- line therapy for non-resectable GISTs, but a single agent therapy often leads to tumor resistance. Even if tolerance to imatinib occurs, a combination of imatinib and surgical treatment can prolong survival in some cases as reported here. However, further studies on a large number of cases of recurrent GIST are necessary to evaluate the effectiveness of IN treatment combined with surgery.

关键词： GIST Imatinib mesylate Liver metastases

Strip-loaded waveguide-based optical phase shifter for high-efficiency silicon optical modulators

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2016年第6期4卷 222-226页

作者： Yuriko Maegami Guangwei Cong Morifumi Ohno Makoto Okano koji Yamada National Institute of Advanced Industrial Science and Technology (AIST)

We propose a novel silicon optical phase shifter structure based on heterogeneous strip-loaded waveguides on a photonic silicon on insulator(SOI) platform. The features of an etchless SOI layer and loaded strip would enhance the performance and uniformity of silicon optical modulators on a large-scale wafer. We implemented the phase shifter by loading an amorphous silicon strip onto an SOI layer with a vertical PN diode structure. Compared to the conventional lateral PN phase shifter based on half-etched rib waveguides, this phase shifter shows a >1.5 times enhancement of modulation efficiency and provides >20 GHz high-speed operation.

关键词： SOI Strip-loaded waveguide-based optical phase shifter for high-efficiency silicon optical modulators high PN

Activation of urchin-like Ni-doped W_(18)O_(49)/NF by electrochemical tuning for efficient water splitting

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第12期30卷 642-650,I0015页

作者： Guojuan Hai Jianfeng Huang Liyun Cao koji Kajiyoshi Long Wang Liangliang Feng Jun Chen School of Material Science and Engineering International S&T Cooperation Foundation of Shaanxi ProvinceXi’an Key Laboratory of Green Manufacture of Ceramic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Intelligent Polymer Research Institute ARC Centre of Excellence for Electromaterials ScienceAustralian Institute for Innovative MaterialsInnovation CampusUniversity of WollongongNSW 2500Australia Kochi University Research Laboratory of Hydrothermal ChemistryKochi 780-8520Japan Faculty of Engineering and Information Sciences University of WollongongNorthfields AvenueWollongongNSW 2522Australia

The electrochemical conversion is closely correlated with the electrocatalytic activities of the ***,the urchin-like Ni-doped W_(18)O_(49)/NF with enriched active sites was prepared by solvothermal method followed by a low-temperature pyrolysis treatment was *** demonstrate that the incorporation of Ni-doping triggers the lattice distortion of W_(18)O_(49) for the increasement of oxygen ***,high-valent W^(6+)are partially reduced to low-valent W^(4+),wherein the electrons originate from the oxidation process of Ni^(2+)to Ni^(3+).The Ni^(3+)ions show an enhanced orbital overlap with the OER reaction *** generated W^(4+)ions contribute to release oxygen vacancies,eventually reorganizing Ni-doped W_(18)O_(49)/NF to unique electrochemical active species with a special amorphous-crystalline interface(AM/NiWO_x/NiOOH/NF).Simultaneously,the reconstruction results in an optimized valence band and conduction ***,the resultant AM/NiWO_x/NiOOH/NF with abundant active sites and improved oxidation/reduction capability exhibits more superior catalytic performance compared with the Ni-doped W_(18)O_(49)/NF *** study gives more insights in the electrochemical evolution of the tungsten-based oxide and provides effective strategies for optimizing the catalytic activity of materials with inherent hydrogen evolution reaction limitations.

关键词： Ni-doped W_(18)O_(49)/NF Electrocatalyst Electrochemical activation Water splitting

Structural effect of fluorophore on phenylboronic acid fluorophore/cyclodextrin complex for selective glucose recognition

在线全文

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2020年第1期14卷 53-60页

作者： Takeshi Hashimoto Mio Kumai Mariko Maeda koji Miyoshi Yuji Tsuchido Shoji Fujiwara Takashi Hayashita Department of Materials and Life Sciences Faculty of Science and TechnologySophia UniversityTokyo102-8554Japan Department of Life Science and Medical Bioscience Graduate School of Advanced Science and EngineeringWaseda University(TWIns)Tokyo162-8480Japan Department of Current Legal Studies Faculty of LawMeiji Gakuin UniversityKanagawa244-8539Japan

Based on the design of the fluorescent site of a fluorescent probe,we have created a unique system that changes its twisting response to *** probes were synthesized,in which phenylboronic acid and two kinds of aromatic fluorescent site(pyrene or anthracene)were conjugated by an amide *** the fluorescence measurement of pyrene-type probe 1,dimer fluorescence was observed at high *** induced circular dichroism(ICD)experiments,a response was observed only in the presence of glucose and γ-cyclodextrin,and no response was seen with *** the other hand,in the fluorescence measurement of anthracene-type probe 2,dimer fluorescence was observed in the presence of both glucose and galactose,and the fluorescence was different from the case of *** the ICD spectra of these inclusion complexes were measured,an inversion of the Cotton effect,which indicates a change in the twisted structure,was observed in galactose and *** differences in response to monosaccharides may originate in the interaction between the fluorescent site and the cyclodextrin cavity.

关键词： sugar recognition phenylboronic acid cyclodextrin fluorescence response induced circular dichroism

Liquid vortexes and flows induced by femtosecond laser ablation in liquid governing formation of circular and crisscross LIPSS

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Opto-Electronic Advances 2022年第2期5卷 1-12页

作者： Dongshi Zhang Xinzhuo Li Yao Fu Qinghe Yao Zhuguo Li koji Sugioka Shanghai Key Laboratory of Materials Laser Processing and Modification School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China RIKEN Center for Advanced Photonics 2-1 HirosawaWakoSaitama 351-0198Japan School of Aeronautics and Astronautics Sun Yat-sen UniversityGuangzhou 510275China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Orientations of laser induced periodic surface structures(LIPSS)are usually considered to be governed by the laser polarization *** this work,we unveil that fluid dynamics induced by femtosecond(fs)laser ablation in liquid(fs-LAL)can easily break this polarization restriction to produce irregular circular-LIPSS(CLIPPS)and crisscross-LIPSS(CCLIPSS).Fs laser ablation of silicon in water shows formation of diverse LIPSS depending on ablation *** a high power of 700 mW(repetition rate of 100 kHz,pulse duration of 457 fs and wavelength of 1045 nm),single/twin CLIPSS are produced at the bottom of macropores of several microns in diameter due to the formation of strong liquid vortexes and occurrence of the vortex shedding *** simulations validate our speculation about the formation of liquid vortex with an ultrahigh static pressure,which can induce the microstructure trenches and cracks at the sidewalls for fs-LAL of Si and tungsten(W)in water,*** a low power of 50 mW,weak liquid vortexes are produced,which only give birth to curved LIPSS in the valleys of ***,it is deduced that liquid vortex plays a crucial role in the formation of ***-like microstructures induce complex fluid dynamics which can cause the formation of CCLIPSS on *** is believed that liquid vortexes and fluid dynamics presented in this work open up new possibilities to diversify the morphologies of LIPSS formed by fs-LAL.

关键词： circular LIPSS crisscross LIPSS laser ablation in liquid femtosecond laser ablation in water liquid vortex vortex shedding