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Study on analysis of crystal structure in CeO_2 doped with Er_2O_3 or Gd_2O_3

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Journal of Rare Earths 2010年第S1期28卷 164-167页

作者： yuki Tahara Kazufumi Yasunaga Toshiyuki Matsui Fuminobu Hori Akihiro Iwase Department of Materials Science Osaka Prefecture University1-1Gakuen-choNaka-kuSakaiOsaka599-8531Japan Department of Applied Quantum Physics and Nuclear Engineering Kyushu University744MotookaNishikuFukuoka 819-0395Japan

To simulate the effects of burnable poison doping in nuclear fuel UO2,Er2O3(or Gd2O3)-doped CeO2 pellets were prepared. Changes in lattice constant and atomic disordering for CeO2 due to the Er2O3 and Gd2O3 doping were measured by means of XRD and XAFS. By the Er2O3 doping,the lattice constant decreased,and a disordering of lattice structure was induced in the samples. The doping with Er2O3 also induced the disordering of atomic arrangement around Er atoms,which was observed through the change in XAFS spectra. In contrast,the effect of Gd2O3 doping was smaller than that of Er2O3 doping. The result was discussed in terms of ionic size of dopants in CeO2 crystal.

关键词： CeO2 ceramic pellets Er2O3 and Gd2O3 doping Change in lattice structure XRD XAFS rare earths

Mechanism of mechanical quenching and mechanoluminescence in phosphorescent CaZnOS:Cu

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Light(Science & Applications) 2015年第1期4卷 65-71页

作者： Dong Tu Chao-Nan Xu yuki Fujio Akihito Yoshida National Institute of Advanced Industrial Science and Technology(AIST) Saga 841-0052Japan Interdisciplinary Graduate School of Engineering Sciences Kyushu UniversityFukuoka 816-8580Japan International Institute for Carbon-Neutral Energy Research(WPI-I2 CNER) Kyushu UniversityFukuoka 819-0395Japan

This article reports a new phosphorescent material,CaZnOS:Cu,that exhibits two types of mechano-optical conversion:mechanical quenching and *** intense mechanical quenching of phosphorescence corresponding to mechanical stimuli can be achieved in CaZnOS:Cu within a short decay time *** time,it gradually changes to mechanoluminescence when a mechanical load is *** propose that the mechanical quenching and mechanoluminescence arise from the different roles of shallow and deep traps in CaZnOS:***:Cu has promising applications in monitoring mechanical stress in industrial plants,structures,and living bodies.

关键词： mechanical quenching mechanoluminescence phosphorescence traps

Effects of dry and mist saunas on circulatory and thermoregulatory functions in humans

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Health 2013年第2期5卷 267-273页

作者： Satoshi Iwase Yuko Kawahara Naoki Nishimura Hiroki Takada Mayumi nagata yuki Niimi Chihiro Miwa Aichi Medical College for Physical Therapy and Occupational Therapy Kiyosu Japan Department of Human & Artificial Intelligent Systems Graduate School of Engineering University of Fukui Fukui Japan Department of Neurology Tsushima Municipal Hospital Tsushima Japan Department of Physiology Aichi Medical University Nagakute Japan Group of Home Systems & Appliance R&D Department of Home Systems & Appliance Sales Toho Gas Co. Ltd. Nagoya Japan Plumbing Fixtures Technology Research Institute Kitchen & Plumbing Fixtures Company LIXIL Corporation Tokoname Japan

To test the hypothesis that mist sauna is a safer way of bathing than dry sauna, we compared changes in circulatory and thermoregulatory functions during 10 min sauna bathing in mist sauna at 40℃ with relative humidity of 100%, and in dry sauna by infrared ray at 70℃ with relative humidity of 15%. Subjects were seven healthy young men aged 29 ± 6 yrs (mean ± SD). We measured blood pressure, heart rate, skin temperatures at chest, forearm, thigh, and leg, tympanic temperature (Tty) by thermistors, skin blood flow at forearm by laser Doppler flowmetry, and sweat rate by ventilated capsule method at 1 min intervals throughout the experiment. Total sweating and change of hematocrit were also measured for dehydration analysis. Blood pressure was elevated more and changes in heart rate and total sweating were larger in dry sauna than mist. A significant hematocrit increase was observed in dry sauna bathing only. Mean skin temperature and Tty in dry sauna were elevated higher than those in mist. Heat stress of the dry sauna may be stronger than that of the mist, leading to dehydration and hypovolemia by sweating. Percent plasma volume loss was significantly larger in the dry than mist sauna. Changes in skin blood flow and sweat rate/Tty during mist sauna were significantly larger than those during dry sauna bathing despite heat stress of the mist sauna. The mist sauna bathing may thus be safer physiologically, and provide more effective vascular dilatation and sweating than the dry sauna bathing.

关键词： Sauna Bathing Mist Sauna Dry Sauna Heat Stress Hemodynamic Change Thermoregulatory Function

Current clinical management of gastrointestinal stromal tumor

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World Journal of Gastroenterology 2018年第26期24卷 2806-2817页

作者： Kazuya Akahoshi Masafumi Oya Tadashi Koga yuki Shiratsuchi Department of Gastroenterology Aso Iizuka Hospital Department of Pathology Aso Iizuka Hospital Department of Surgery Aso Iizuka Hospital

Gastrointestinal stromal tumors(GISTs) are the most common malignant subepithelial lesions(SELs) of the gastrointestinal tract. They originate from the interstitial cells of Cajal located within the muscle layer and are characterized by over-expression of the tyrosine kinase receptor KIT. Pathologically, diagnosis of a GIST relies on morphology and immunohistochemistry [KIT and/or discovered on gastrointestinal stromal tumor 1(DOG1) is generally positive]. The prognosis of this disease is associated with the tumor size and mitotic index. The standard treatment of a GIST without metastasis is surgical resection. A GIST with metastasis is usually only treated by tyrosine kinase inhibitors without radical cure; thus, early diagnosis is the only way to improve its prognosis. However, a GIST is usually detected as a SEL during endoscopy, and many benign and malignant conditions may manifest as SELs. Conventional endoscopic biopsy is difficult for tumors without ulceration. Most SELs have therefore been managed without a histological diagnosis. However, a favorable prognosis of a GIST is associated with early histological diagnosis and R0 resection. Endoscopic ultrasonography(EUS) and EUS-guided fine needle aspiration(EUSFNA) are critical for an accurate diagnosis of SELs. EUSFNA is safe and effective in enabling an early histological diagnosis and adequate treatment. This review outlines the current evidence for the diagnosis and management of GISTs, with an emphasis on early management of small SELs.

关键词： Gastrointestinal stromal tumor Endoscopic ultrasonography-guided fine needle aspiration Endoscopic ultrasonography Diagnosis Therapy

Cu_2O-based solar cells using oxide semiconductors

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Journal of Semiconductors 2016年第1期37卷 38-46页

作者： Tadatsugu Minami yuki Nishi Toshihiro Miyata Optoelectronic Device System R&D Center Kanazawa Institute of Technology

We describe significant improvements of the photovoltaic properties that were achieved in Al-doped ZnO（AZO）/n-type oxide semiconductor/p-type Cu_2O heterojunction solar cells fabricated using p-type Cu_2O sheets prepared by thermally oxidizing Cu sheets. The multicomponent oxide thin film used as the n-type semiconductor layer was prepared with various chemical compositions on non-intentionally heated Cu_2O sheets under various deposition conditions using a pulsed laser deposition method. In Cu_2O-based heterojunction solar cells fabricated using various ternary compounds as the n-type oxide thin-film layer, the best photovoltaic performance was obtained with an n-ZnGa_2O_4 thin-film layer. In most of the Cu_2O-based heterojunction solar cells using multicomponent oxides composed of combinations of various binary compounds, the obtained photovoltaic properties changed gradually as the chemical composition was varied. However, with the ZnO–MgO and Ga_2O_3–Al_2O_3systems, higher conversion efficiencies（á/ as well as a high open circuit voltage（Voc/ were obtained by using a relatively small amount of MgO or Al_2O_3, e.g.,（ZnO）0：91–（MgO）0：09 and（Ga_2O_3/0：975–（Al_2O_3/0：025, respectively. When Cu_2O-based heterojunction solar cells were fabricated using Al_2O_3–Ga_2O_3–MgO–ZnO（AGMZO）multicomponent oxide thin films deposited with metal atomic ratios of 10, 60, 10 and 20 at.% for the Al, Ga, Mg and Zn, respectively, a high Vocof 0.98 V and an á of 4.82% were obtained. In addition, an enhanced á and an improved fill factor could be achieved in AZO/n-type multicomponent oxide/p-type Cu_2O heterojunction solar cells fabricated using Na-doped Cu_2O（Cu_2O：Na） sheets that featured a resistivity controlled by optimizing the post-annealing temperature and duration. Consequently, an á of 6.25% and a Vocof 0.84 V were obtained in a Mg F2/AZO/n-（Ga_2O_3–Al_2O_3//p-Cu_2O：Na heterojunction solar cell fabricated using a Cu_2O：Na sheet with a resistivity of approximately 10 cm and a（Ga_

关键词： Cu2O n-type oxide semiconductor heterojunction solar cells high efficiency

An international expert consensus of management of recurrent hepatocellular carcinoma: a viewpoint

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Hepatobiliary Surgery and Nutrition 2020年第3期9卷 394-396页

作者： Kuniya Tanaka yuki Takahashi Tetsuji Wakabayashi Department of Gastroenterological and General Surgery Showa University Fujigaoka HospitalYokohamaJapan

We read with great interest the article titled "Multidisciplinary management of recurrent and metastatic hepatocellular carcinoma after resection: an international expert consensus" (1) published in Hepato Biliary Sur... 详细信息

关键词： Surgery hepatocellular carcinoma

Foreword to the Special Issue on Micro- and Nano-Metrology in Japan(I)

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Nanomanufacturing and Metrology 2021年第2期4卷 1-2页

作者： yuki Shimizu Yasuhiro Mizutani Masaki Michihata Department of Finemechanics Tohoku UniversitySendai 9808579Japan Department of Mechanical Engineering Osaka UniversitySuita 5650871Japan Department of Precision Engineering The University of TokyoBunkyo 1138654Japan

Micro-and nano-metrology occupies an important position in modern production engineering where higher-precision machining is required.A visualization of the process is indispensable for the creation of new technologies in stateof-the-art manufacturing that deals with the geometrical quantity in micrometers/*** micro-and nano-metrology is thus becoming more and more important as the platform of various manufacturing technologies,as well as strategic tools for responding to rapidly changing fabrication techniques in many scientific and industrial fields.

关键词： metrology becoming Japan

Influence of Additive Gas on Electrical and Optical Characteristics of Non-equilibrium Atmospheric Pressure Argon Plasma Jet

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Plasma Science and Technology 2011年第5期13卷 575-582页

作者：费小猛 Shin-ichi KURODA yuki KONDO Tamio MORI Katsuhiko HOSOI Department of Advanced Production Science and Technology Graduate School of EngineeringGunma University Cresur Corporation

Electrical and optical properties of an argon plasma jet were characterized. In particular, effects of an additive gas, namely nitrogen or oxygen, on these properties were studied in detail. The plasma jet was found to be of a glow-like discharge, which scarcely changed upon the injection of an additive gas, either directly or through a glass capillary. Optical emission spectroscopy characterization revealed that excited argon atoms were the predominant active species in this plasma jet. Metastable argon atoms were highly quenched, and N2（C3yIu） became the main energy carrier following nitrogen injection. When oxygen was added to the afterglow zone through a glass capillary, no significant quenching effect was observed and the number of oxygen atoms decreased with the increase in oxygen concentration. Finally, to demonstrate an application of this plasma jet, a high-density polyethylene surface was treated with argon, argon/nitrogen, and argon/oxygen plasmas.

关键词： atmospheric pressure Ar plasma jet additive gas discharge optical emission spectroscopy

Crucial anatomy and technical cues for laparoscopic transabdominal preperitoneal repair: Advanced manipulation for groin hernias in adults

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World Journal of Gastrointestinal Surgery 2020年第7期12卷 307-325页

作者： Daiki Yasukawa yuki Aisu Tomohide Hori Department of Surgery Shiga University of Medical ScienceOtsu 520-2192Japan Department of Surgery Kyoto University Graduate School of MedicineKyoto 606-8507Japan

Groin hernias include indirect inguinal, direct inguinal, and femoral hernias. Obturator and supravesical hernias appear very close to the groin. High-quality repairs are required for groin hernias. The concept of "tension-free repair" is generally accepted, and surgical repairs with mesh are categorized as "hernioplasties". Surgeons should have good knowledge of the relevant anatomy. Physicians generally focus on the preperitoneal space, myopectineal orifice, topographic nerves, and regional vessels. Currently, laparoscopic surgery has therapeutic potential in the surgical setting for hernioplasty, with laparoscopic transabdominal preperitoneal(TAPP) repair appearing to be a powerful tool for use in adult hernia patients. TAPP offers the advantages of accurate diagnoses, repair of bilateral and recurrent hernias, less postoperative pain, early recovery allowing work and activities, tension-free repair of the preperitoneal(posterior) space, ability to cover obturator hernias, and avoidance of potential injury to the spermatic cord. The disadvantages of TAPP are the need for general anesthesia, adhering to a learning curve, higher cost, unexpected complications related to abdominal organs, adhesion to the mesh, unexpected injuries to vessels, prolonged operative time, and as-yet-unknown long-term outcomes. Both technical skill and anatomical familiarity are important for safe, reliable surgery. With increasing awareness of the importance of anatomy during TAPP repair, we address the skills and pitfalls during laparoscopic TAPP repair in adult patients using illustrations and schemas. We also address debatable points on this subject.

关键词： Inguinal hernia Femoral hernia Obturator hernia Laparoscopic surgery Laparoscope Anatomy