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Stability of phases in (Ba, Gd)MnO_3 solid solution system

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Journal of Rare Earths 2008年第2期26卷 233-236页

作者： Migaku Kobayashi Hidenori Tamura hiromi nakano Hirohisa Satoh Naoki Kamegashira Department of Chemistry and Biochemistry Numazu National College of Technology 3600 Ooka Numazu Electron Microscope Laboratory Ryukoku University Department of Materials Science Toyohashi University of Technology Tempaku-cho

The existing phases in BaxGd1-xMnO3 solid solution system （0≤x≤ 1） were studied by analyzing the detailed crystal structure of each composition from the results of the Rietveld method using powder X-ray diffraction data. For a small substitution of Ba for Gd （0≤x〈0. 1）, the orthorhombic phase with a perovskite type structure （Pnma space group） was stably formed and this fact was supported by the electron diffraction data. There existed an intermediate phase of Ba0.33Gd0.67MnO3, which was characterized as the tetragonal phase with perovskite structure. The composition range of this phase was narrow and almost line compound. Between the regions of these phases, there existed two-phase region. There was also a two-phase region between the intermediate tetragonal phase and BaMnO3. Measurement of electrical conductivities of these orthorhombic solid solutions and tetragonal phases showed semiconducting behaviors for both phases and the existence of the phase transition at high temperature for the orthorhombic phase, The transition temperature decreased as the Ba content increased.

关键词： rare earth manganite phase behavior X-ray diffractometry crystal structure electrical conductivity

Roles of rare earth oxide additives in millimeter-wave sintering of AlN

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Journal of Rare Earths 2008年第2期26卷 141-145页

作者： Yukio Makino Takashi Yoshioka hiromi nakano Toshiyuki Ueno Shoji Miyake Osaka University 11-1 Mihogaoka IbarakiOsaka 567-0047 Japan Shimane Institute for Industrial Technology 1 Hokuryo-cho Matsue Simane 690-0816 Japan Ryukoku University Seta Otsu Shiga 520-2194 Japan Kinki University 3-4-1 Kowakae Higashi-OsakaOsaka 577-8502 Japan

Roles of rare earth oxide （RE2O3） additives in millimeter-wave（MM） sintering of AIN were investigated from the standpoints of phase diagram, heating characteristics of rare earth oxides, and morphology of intergranular oxide phase. In the millimeter-wave sintering of AIN, densification temperature decreased with the decrease of the ionic radius of rare earth ion and was closely related with the eutectic temperature in the RE2Oa-Al2O3 binary system. The lowest densification temperature in the millimeter-wave sintering of AIN with Yb2O3 additive was attributed to the largest heating rate of Yb2O3-Al2O3 binary oxide under millimeter-wave radiation. Furthermore, the lowest densification temperature could be attained while selecting the Yb2O3 content so as to form the intergranular phase with the eutectic composition in the Yb2O3-Al2O3 binary system. The result showed good agreement with the above mentioned during the sintering of Si3N4 with Yb2O3-Al2O3 additive. From TEM observation, it was verified that film-like intergranular oxide phase formed under millimeter-wave radiation was favorable for attaining high thermal conductivity in the Yb2O3 added AINs.

关键词： millimeter-wave rare earth oxide AIN, Si3N4 rapid densification selective heating heating rate thermal conductivity morphology

Structural Analysis of a New Phase of BaNdMnO_4

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Journal of Rare Earths 2007年第S1期25卷 1-3页

作者： hiromi nakano Norikatsu Kawabata Hirohisa Satoh Naoki Kamegashira Ryukoku University SetaOtsu520-2194Japan Toyohasi University of Technology 441-8580Japan

Single crystal of BaNdMnO4 with I4/mmm was synthesized by a floating zone method. A new phase of BaNdMnO4 was obtained by annealing the single crystal in a reducing atmosphere at 573 K for 10 d. The structural change was analyzed by four-circle X-ray diffractometry and transmission electron microscopy. The new phase has an orthorhombic unit cell (Fmmm) of a=0.5486(2) nm, b=0.5484(2) nm, and c=1.3059(2) nm.

关键词： rare earth manganite structure transmission electron microscopy X-ray diffractometry

Phase Behavior and Crystal Structure of Perovskite-Type Rare Earth Complex Oxides

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Journal of Rare Earths 2006年第6期24卷 668-672页

作者： Migaku Kobayashi Ryoko Katsuraya Tsubasa Nara Yusuke Tomita hiromi nakano Naoki Kamegashira Department of Chemistry and Biochemistry Numazu College of Technology 3600 Ooka Numazu 410-8501 Japan Ryukoku University Seta Otsu 520-2194 Japan Department of Materials Science Toyohashi University of Technology Tempaku-cho Toyohashi 441-8580 Japan

Several compounds of rare earth complex oxides containing manganese and titanium were synthesized in Ar, and their crystal structures were analyzed by powder X-ray diffraction data and Rietveld method. Structures of A0.67Ln0.33 Mn0.33Ti0.6703（A = Ca or Sr and Ln = rare earth） were found to have orthorhombic symmetry with the space group Pnrna, and their interatomic distances and bond angles were obtained. This space group was also derived from electron microscopic study. Electrical conductivity of Cao.67Ln0.33Mn0.33Ti0.6703 for several rare earth elements showed a semiconducting property with the activation energy of 0.4 eV. Some of these compounds of the strontium system show the antiferromagnetic properties below 10 K.

关键词： perovskite crystal structure X-ray diffraction alkaline earth rare earth manganese titanium oxide

Headache at the onset of stroke: Frequencies, background characteristics and correlation with mortality

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Health 2013年第1期5卷 89-95页

作者： Kazuo Shigematsu hiromi nakano Yoshiyuki Watanabe Tatsuyuki Sekimoto Kouichiro Shimizu Akihiko Nishizawa Atsushi Okumura Masahiro Makino Touru Seki Kazuhiko Bando Yasushi Kitagawa Department of Epidemiology for Community Health and Medicine Kyoto Prefectural University of Medicine Graduate School of Medical Science Kyoto Japan Department of Internal Medicine The Bando Clinic Kyoto Japan Department of Internal Medicine The Kitagawa Clinic Kyoto Japan Department of Internal Medicine The Nishizawa Clinic Kyoto Japan Department of Internal Medicine The Seki Clinic Kyoto Japan Department of Neurology Japanese Red Cross Kyoto Daini Hospital Kyoto Japan Department of Neurology National Hospital Organization Minami Kyoto Hospital Kyoto Japan Department of Neurosurgery Jujyo Rehabilitation Hospital Kyoto Japan Department of Neurosurgery Kyoto Fushimi Shimizu Hospital Kyoto Japan Department of Neurosurgery Kyoto Kidugawa Hospital Kyoto Japan Department of Neurosurgery Kyoto Prefectural Yosanoumi Hospital Kyoto Japan

Background: Headache is a common symptom and sometimes makes patients worry about stroke. Some stroke patients actually have headache. However, the frequency of headache at the onset of stroke and the relationship between headache and outcomes are not fully clarified. Objective: The aim of the study is to clarify frequency of headache, and to compare patients with headache with patients without headache in their characteristics, risk factors and early mortalities. Methods: We confirmed the presence or absence of onset headache in 1671 patients in the Kyoto Stroke Registry. We studied frequencies of headache, age, sex, blood pressure, arrhythmia, diabetes mellitus, hyperlipemia, tobacco and alcohol use and mortality of stroke patients. Results: Headache was observed in 21.4% of stroke patients;12.0% in cerebral infarction (CI), 29.8% in cerebral hemorrhage (CH), and 93.9% in subarachnoid hemorrhage (SAH). Blood pressure at the first medical examination after stroke was higher in patients with headache. Factors associated with headache were age, diastolic blood pressure, hypertension and hyperlipemia histories, alcohol use, and paresis in CI, age, alcohol and tobacco use and paresis in CH and systolic blood pressure in SAH. The mortality rate 30 days after the stroke event was higher by 6.8% in CI and by 11.4% in CH in patients with headache than that in patients without headache. The hazard ratios for death between patients with headache and patients without headache were 4.94 (1.73 - 14.08, p = 0.003) in CI, and 3.20 (1.10 - 9.36, p = 0.033) in CH. Conclusions: Headache is common in stroke and predicts outcome. Headache is associated with younger age and alcohol use in CI and CH. Patients who could express presence of headache at the onset of CI or CH have higher mortality than patients who could express absence of headache. Headache is important both as an identifier of stroke and as a poor prognostic indicator in stroke.

关键词： Headache Stroke Outcomes Mortality Epidemiology

Education Programs for Invasive Procedures Involving Nurses: A Scoping Review

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Open Journal of Nursing 2024年第5期14卷 200-224页

作者： hiromi Shibuya Akiko Saito Masumi Mugiyama Noyuri Yamaji Chisato Eto Satoshi Shibuya Department of Nursing Faculty of Health Science Technology Bunkyo Gakuin University Tokyo Japan Department of Health Care Policy and Health Economics Institute of Medicine University of Tsukuba Ibaraki Japan Institute of Clinical Epidemiology Showa University Tokyo Japan Department of Family Nursing Division of Health Science and Nursing Graduate School of Medicine The University of Tokyo Tokyo Japan Department of Global Health Nursing Graduate School of Nursing St. Luke&#8217s International University Tokyo Japan School of Nursing Tokyo Women&#8217s Medical University Tokyo Japan Department of Integrative Physiology School of Medicine Kyorin University Tokyo Japan

Background: Implementing invasive procedures is an important part of patient management by clinical nurses;however, there are gaps between nurses’ actual knowledge and skills and expected professional care capacity. Purpose: This scoping review aimed to map the existing literature related to recent institution-provided educational programs for invasive procedures involving clinical nurses. This study seeks to understand the contents of educational programs and the methods for assessing educational effects. Methods: This scoping review was completed using the following four databases: PubMed (MEDLINE), Embase, Cochrane Library, and Emcare for the period 2000-2022. We included studies that used all forms of educational approaches (e.g., didactic lectures, hands-on training, or on-the-job training). This scoping review considered peer-reviewed publications published in English using quantitative, qualitative, or mixed approaches. A total of 83 studies underwent in the final analysis. Results and Conclusion: A combination of didactic lectures and hands-on training was provided as an educational program in most studies. Contrary to our prediction, educational interventions with advanced technologies such as VR are extremely rare, suggesting that the effectiveness of advanced technologies in learning invasive procedures should be examined to facilitate and retain educational effects more efficiently in future studies. Regarding the assessment of educational effects, nurses’ cognitive (i.e., theoretical knowledge about procedures), psychomotor (i.e., implementing procedures), and psychological aspects (e.g., confidence and self-efficacy in procedures) were evaluated using questionnaires and observational methods. While most studies used a one-group pretest-posttest design, the ratio of randomized controlled trials (RCT) was relatively low. Thus, an RCT design should be introduced in future studies to test the validity of the developed educational program more accurately.

关键词： Training Education Invasive Procedure Nurses Assessment

热压缩同时提高挤压镁-锰-锌合金的强度和热导率(英文)

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Transactions of Nonferrous Metals Society of China 2024年

作者：刘海峰杨续跃张宇修 hiromi Nagaumi 赵明纯石智勇 Andrej Atrens School of Mechanical & Mining Engineering University of Queensland Brisbane 中南大学材料科学与工程学院苏州大学钢铁学院

在这项研究中，对挤压镁-锰-锌合金进行了热压缩处理。合金在 150°C以 15:1 的挤压比挤压，然后沿着挤压方向以真应变为0.9进行热压缩。通过光学显微镜、扫描电子显微镜、电子背散射衍射和透射电子显微镜研究了挤压态和热压缩态Mg-Mn-Z... 详细信息

在这项研究中，对挤压镁-锰-锌合金进行了热压缩处理。合金在 150°C以 15:1 的挤压比挤压，然后沿着挤压方向以真应变为0.9进行热压缩。通过光学显微镜、扫描电子显微镜、电子背散射衍射和透射电子显微镜研究了挤压态和热压缩态Mg-Mn-Zn合金的微观结构、机械性能和热导率。旨在通过获得均匀、细小的显微结构、以及降低织构强度，同时提高强度和导热性。屈服强度（YS）、极限拉伸强度（UTS）和伸长率（EL）得到了显著的提高，分别提高了77%、53%和10%。热导率也得到了显著的提高，从111 W/(m·K)提高到了125 W/(m·K)。本研究阐明了热压缩改善性能的机理，为开发具有优良热性能和力学性能的镁合金提供了一条有前景的途径。

关键词：镁合金热压缩强度热导率

利用探针跳跃式扫描离子电导显微镜技术揭示结直肠癌单细胞层面对H2O2良性应激的动态响应（英文）

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Science Bulletin 2024年第12期 1909-1919页

作者：王东 Emily Woodcock 杨羲 hiromi Nishikawa Elena V.Sviderskaya Masanobu Oshima Christopher Edwards 张彦军 Yuri Korchev WPI Nano Life Science Institute (WPI-Nano LSI) Kanazawa University Department of Medicine Imperial College London Cell Biology Research Centre Molecular and Clinical Sciences Research Institute St George's University of London

Colorectal cancer（CRC）, a widespread malignancy, is closely associated with tumor microenvironmental hydrogen peroxide（H2O2） levels. Some clinical trials targeting H2O2for cancer treatment have revealed its paradoxical role as a promoter of cancer progression. Investigating the dynamics of cancer cell H2O2eustress at the single–cell level is crucial. In this study, non–contact hopping probe mode scanning ion conductance microscopy（HPICM） with high-sensitive Pt–functionalized nanoelectrodes was employed to measure dynamic extracellular to intracellular H2O2gradients in individual colorectal cancer Caco–2cells. We explored the relationship between cellular mechanical properties and H2O2gradients.Exposure to 0.1 or 1 mmol/L H2O2eustress increased the extracellular to intracellular H2O2gradient from 0.3 to 1.91 or 3.04, respectively. Notably, cellular F–actin–dependent stiffness increased at 0.1 mmol/L but decreased at 1 mmol/L H2O2eustress. This H2O2–induced stiffness modulated AKT activation positively and glutathione peroxidase 2（GPX2） expression negatively. Our findings unveil the failure of some H2O2-targeted therapies due to their ineffectiveness in generating H2O2, which instead acts eustress to promote cancer cell survival. This research also reveals the complex interplay between physical properties and biochemical signaling in cancer cells' antioxidant defense, illuminating the exploitation of H2O2eustress for survival at the single–cell level. Inhibiting GPX and/or catalase（CAT） enhances the cytotoxic activity of H2O2eustress against CRC cells, which holds significant promise for developing innovative therapies targeting cancer and other H2O2-related inflammatory diseases.

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Artificial oxygen carriers,from nanometer-to micrometer-sized particles,made of hemoglobin composites substituting for red blood cells

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Particuology 2022年第5期20卷 43-55页

作者： Takashi Matsuhira hiromi Sakai Department of Chemistry Nara Medical University840 Shijo-choKashihara 634-8521Japan

Blood transfusions are regarded as the most well-known and frequently performed cell transplantations.Although current transfusion systems are sophisticated,they cannot be freed from the inherent difficulties that include infection,short shelf life,and blood type mismatching.Artificial oxygen carriers produced using hemoglobin(Hb)are designated as Hb-based oxygen carriers(HBOCs),which are anticipated for use as biomaterials that have potential to resolve issues of transfusion by a radical paradigm shift.Various HBOCs,nanometer-sized to micrometer-sized bioparticles having an oxygen-carrying function,are developed for use as substitutes for red blood cells(RBCs).This paper presents an overview of the classification of HBOCs with reference to their histories,preparations,structures,functions,and in vitro and in vivo properties.Additionally,we give a more detailed introduction of our academic studies of liposome encapsulated Hb,designated as Hb-vesicles(HbV),which mimic the physiologically important corpuscular structure of RBCs.This review outlines perennial efforts and approaches to mimic RBC functions through chemical,genetic,and encapsulation techniques.It will provide important insights into the eventual realization of an alternative for RBC transfusion.

关键词： Blood substitutes Cross-linking Hemoglobin(Hb)-based oxygen carriers(HBOCs) Liposome Supramolecular assembly Transfusion alternatives