21 results on '"Yokota, Hiroko"'
Search Results
2. Three-dimensional imaging of ferroaxial domains using circularly polarized second harmonic generation microscopy
- Author
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Yokota, Hiroko, Hayashida, Takeshi, Kitahara, Dan, and Kimura, Tsuyoshi
- Published
- 2022
- Full Text
- View/download PDF
3. Second harmonic generation and X-ray diffraction studies of pretransitional region in relaxor K(1-x) LixTaO3
- Author
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Yokota, Hiroko, Uesu, Yoshiaki, Malibert, Charlotte, and Kiat, Jean-Michel
- Subjects
Condensed Matter - Materials Science - Abstract
Optical second-harmonic-generation(SHG) observations and precise X-ray diffraction experiments have been performed on quantum paraelectrics KTaO3 (KTO) and relaxor K(1-x)LixTaO3 with x=3% (KLT-3) and 7% (KLT-7). It is found in KLT-3 and KLT-7 that a pretransitional region exists between two characteristic temperatures Td and Tp (
- Published
- 2006
- Full Text
- View/download PDF
4. SHG microscopic observations of polar state in Li-doped KTaO3 under electric field
- Author
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Yokota, Hiroko, Ohyama, Taeko, and Uesu, Yoshiaki
- Subjects
Condensed Matter - Materials Science - Abstract
Incipient ferroelectric KTaO3 with off-center Li impurity of the critical concentration of 2.8 mol% was investigated in order to clarify the dipole glass state under electric field. Using optical second-harmonic generation (SHG) microscope, we observed a marked history dependence of SHG intensity through zero-field cooling (ZFC), zero-field heating (ZFH), field heating after ZFC (FH/ZFC) and FH after field cooling (FH/FC). These show different paths with respect to temperature: In the ZFC/ZFH process, weak SHG was observed at low temperature, while in the FH/ZFC process, relatively high SHG appears in a limited temperature range below TF depending on the field strength, and in the FC and FH/FC processes, the SHG exhibits ferroelectric-like temperature dependence: it appears at the freezing temperature of 50K, increases with decreasing temperature and has a tendency of saturation. These experimental results strongly suggest that dipole glass state or polar nano-clusters which gradually freezes with decreasing temperature is transformed into semi-macroscopic polar state under the electric field. However at sufficiently low temperature, the freezing is so strong that the electric field cannot enlarge the polar clusters. These experimental results show that the polar nano-cluster model similar to relaxors would be more relevant in KTaO3 doped with the critical concentration of Li. Further experiments on the anisotropy of SHG determine that the average symmetry of the field-induced polar phase is tetragonal 4mm or 4, which is also confirmed by the X-ray diffraction measurement., Comment: 26 pages, 8 figures, 1 table
- Published
- 2005
- Full Text
- View/download PDF
5. Element-specific magnetic hysteresis loops observed in hexagonal ErFeO3 thin films
- Author
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Yokota, Hiroko, primary, Kobori, Yu, additional, Jitsukawa, Shunsuke, additional, Sakai, Seiji, additional, Takeda, Yukiharu, additional, Mitsui, Takaya, additional, Kobayashi, Yasuhiro, additional, and Kitao, Shinji, additional
- Published
- 2021
- Full Text
- View/download PDF
6. Lesson Program for Spatial Composition of 'House' with Different Structural Methods by Third Graders of Primary School
- Author
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Okinishi, Keiko, Yokota, Hiroko, Hattori, Futoshi, Sendai, Shouichirou, and Hikita, Atsushi
- Abstract
本年度は,3年生児童によるワークショップを実施し,「結ぶ」,「組む」という異なる二つの製作手法を用いた,「安全な家」の模型づくりの授業を構成した。製作模型では,児童によって多少の個人差はあるが,床や屋根の構造のつくり方と制作のプロセスの変化に一定の類型があることが明らかになった。また、製作前後で行ったアンケートの分析では、「結ぶ」手法から「組む」手法へと変わった際に、空間に対して求めるものが変化することが分かった。模型製作手法という外的要因が児童の安全に対する意識に影響を与えたことを明らかにしたことが最大の成果である。児童の生活環境との相関,床面の構成の分析などが,今後の空間構成に関する研究の上での課題として残された。, In this year, we had the workshop by third grade students and make the lesson program for the making of a model as “secure house” with structural methods of “tying” and “wooden jointing”. In the making of models, though there are some individual differences, we found the definite types to make models: the floor or the roof structure, and the making process itself. In analysis of questionnaire before and after the workshop, what children desired for living space changed, when the method was changed from “tying” to “wooden jointing”. It is the important result that children’s conscious for secure was affected by external factor; the model making method. Theme relation of children’s living environment and analysis of structure of floor require further study.
- Published
- 2017
7. A Examination about Course-specific Ability on the Subjects in the Course of Arts and Crafts and Arts.: Through the Visualization of Idea Processes
- Author
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Amano, Shinichi, Shimatani, Ayumi, Yamamoto, Fusami, Matsumoto, Hiroko, Matsuzaki, Shinichi, Yokota, Hiroko, Mine, Kazunami, and Yata, Chikahiko
- Abstract
図画工作科・美術科固有の能力を形成する「発想」がどのようにして生まれ,促され,構想へと高まっていくのか,実際の授業場面でそのプロセスを可視化することは容易ではない。そしてこれが,美術教育に関する専門性や経験の十分でない多くの指導者にとって,この教科の指導を困難なものとする一因にもなっている。そこで,小・中学校の様々な発達段階の児童・生徒を対象とする具体的な授業実践を通して,絵画及び立体表現における発想プロセスの可視化を図るとともに,これを手がかりに「発想や構想の能力」を高める上で効果的な授業構想や手立ての在り方について探ることを目的に本研究に取り組んだ。学習過程を横軸,発想喚起要素(題材の特性にかかわる要素と技能的要素)を縦軸としたマトリクス表に基づく題材分析,発想を促すことに焦点化した手立ての吟味,ポートフォリオを活用した経過観察,そして個別に実施した自己評価アンケートの分析を通して,発達段階による発想の広がり方の違いや,発想に影響を与える様々な要素(鑑賞,材料,用具,協働的な学び等)についてある程度の知見を得ることができた。, We practiced lessons on elementary school children and junior high school students, and tried this visualization of ideas process on painting and stereoscopic expression. We did this research so that we could explore effective lesson plans and methods to raise "ability to create ideas and concepts." We got some findings about the differences in how the ideas spread in the developmental stage and various factors that influence ideas (appreciation, materials, tools, collaborative learning etc.). This analysis based on the matrix table with the horizontal axis of the learning process and the vertical axis of the elements that inspire ideas (elements related to the characteristics of the material and skill elements), and the examination of the methods focused on encouraging the ideas, and the follow-up observation using portfolios, and the analysis of self-evaluation questionnaires conducted individually.
- Published
- 2017
8. Element-specific magnetic hysteresis loops observed in hexagonal ErFeO3 thin films.
- Author
-
Yokota, Hiroko, Kobori, Yu, Jitsukawa, Shunsuke, Sakai, Seiji, Takeda, Yukiharu, Mitsui, Takaya, Kobayashi, Yasuhiro, and Kitao, Shinji
- Published
- 2021
- Full Text
- View/download PDF
9. Local-scale structures across the morphotropic phase boundary in PbZr1−x Ti x O3
- Author
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Zhang, Nan, primary, Yokota, Hiroko, additional, Glazer, A. M., additional, Keen, D. A., additional, Gorfman, Semën, additional, Thomas, P. A., additional, Ren, Wei, additional, and Ye, Zuo-Guang, additional
- Published
- 2018
- Full Text
- View/download PDF
10. 図画工作科・美術科における教科固有の能力に関する検討 : 発想プロセスの可視化を手がかりに
- Author
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Amano, Shinichi, Shimatani, Ayumi, Yamamoto, Fusami, Matsumoto, Hiroko, Matsuzaki, Shinichi, Yokota, Hiroko, Mine, Kazunami, Yata, Chikahiko, Amano, Shinichi, Shimatani, Ayumi, Yamamoto, Fusami, Matsumoto, Hiroko, Matsuzaki, Shinichi, Yokota, Hiroko, Mine, Kazunami, and Yata, Chikahiko
- Abstract
図画工作科・美術科固有の能力を形成する「発想」がどのようにして生まれ,促され,構想へと高まっていくのか,実際の授業場面でそのプロセスを可視化することは容易ではない。そしてこれが,美術教育に関する専門性や経験の十分でない多くの指導者にとって,この教科の指導を困難なものとする一因にもなっている。そこで,小・中学校の様々な発達段階の児童・生徒を対象とする具体的な授業実践を通して,絵画及び立体表現における発想プロセスの可視化を図るとともに,これを手がかりに「発想や構想の能力」を高める上で効果的な授業構想や手立ての在り方について探ることを目的に本研究に取り組んだ。学習過程を横軸,発想喚起要素(題材の特性にかかわる要素と技能的要素)を縦軸としたマトリクス表に基づく題材分析,発想を促すことに焦点化した手立ての吟味,ポートフォリオを活用した経過観察,そして個別に実施した自己評価アンケートの分析を通して,発達段階による発想の広がり方の違いや,発想に影響を与える様々な要素(鑑賞,材料,用具,協働的な学び等)についてある程度の知見を得ることができた。, We practiced lessons on elementary school children and junior high school students, and tried this visualization of ideas process on painting and stereoscopic expression. We did this research so that we could explore effective lesson plans and methods to raise "ability to create ideas and concepts." We got some findings about the differences in how the ideas spread in the developmental stage and various factors that influence ideas (appreciation, materials, tools, collaborative learning etc.). This analysis based on the matrix table with the horizontal axis of the learning process and the vertical axis of the elements that inspire ideas (elements related to the characteristics of the material and skill elements), and the examination of the methods focused on encouraging the ideas, and the follow-up observation using portfolios, and the analysis of self-evaluation questionnaires conducted individually.
- Published
- 2017
11. 模型製作手法の違いによる小学生3年生の「家」の空間構成に関する授業構成
- Author
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Okinishi, Keiko, Yokota, Hiroko, Hattori, Futoshi, Sendai, Shouichirou, Hikita, Atsushi, Okinishi, Keiko, Yokota, Hiroko, Hattori, Futoshi, Sendai, Shouichirou, and Hikita, Atsushi
- Abstract
本年度は,3年生児童によるワークショップを実施し,「結ぶ」,「組む」という異なる二つの製作手法を用いた,「安全な家」の模型づくりの授業を構成した。製作模型では,児童によって多少の個人差はあるが,床や屋根の構造のつくり方と制作のプロセスの変化に一定の類型があることが明らかになった。また、製作前後で行ったアンケートの分析では、「結ぶ」手法から「組む」手法へと変わった際に、空間に対して求めるものが変化することが分かった。模型製作手法という外的要因が児童の安全に対する意識に影響を与えたことを明らかにしたことが最大の成果である。児童の生活環境との相関,床面の構成の分析などが,今後の空間構成に関する研究の上での課題として残された。, In this year, we had the workshop by third grade students and make the lesson program for the making of a model as “secure house” with structural methods of “tying” and “wooden jointing”. In the making of models, though there are some individual differences, we found the definite types to make models: the floor or the roof structure, and the making process itself. In analysis of questionnaire before and after the workshop, what children desired for living space changed, when the method was changed from “tying” to “wooden jointing”. It is the important result that children’s conscious for secure was affected by external factor; the model making method. Theme relation of children’s living environment and analysis of structure of floor require further study.
- Published
- 2017
12. Physical Therapy Intervention in a Child with Motor Incoordination and Learning Disorder
- Author
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Yokota, Hiroko and Shimada, Tomoaki
- Subjects
Motor incoordination ,Learning disorder ,Physical therapy - Published
- 1997
13. Optical Second Harmonic Generation Microscopy as a Tool of Material Diagnosis
- Author
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Yokota, Hiroko, Kaneshiro, Junichi, and Uesu, Yoshiaki
- Subjects
Article Subject - Abstract
The second harmonic generation microscope (SHGM) constructs images of intensity distributions of SH waves produced by the interaction of fundamental waves with a polar material. We have developed this nonlinear optical microscope in order to make possible nondestructive, three-dimensional (3D) observations of various kinds of inorganic and organic materials. The SHGM can disclose also inverted domain structures of antiparallel spontaneous polarizations using the interference with the reference SH waves. The observation principle and several applications to structural characterizations of LiNbO3 and LiTaO3 quasi-phase matching devices, domain structure analyses of a relaxor/ferroelectric solid solution Pb(Zn1/3Nb2/3)O3-9%PbTiO3 at the morphotropic phase boundary, development of order parameter in a quantum paraelectric relaxor Li-doped KTaO3, and antiphase polar domain structures of muscle fibers and myofibrils are surveyed by stressing the high effectiveness of the SHGM as a tool of material diagnosis.
- Published
- 2012
- Full Text
- View/download PDF
14. Recent Progress on the SHG Interference Microscope and Its Applications
- Author
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Uesu, Yoshiaki, primary, Yokota, Hiroko, additional, Kawado, Satoshi, additional, and Kato, Noritaka, additional
- Published
- 2007
- Full Text
- View/download PDF
15. Non-Ergodic Behavior of Polarization Growth in the Quantum Relaxor K1-xLixTaO3
- Author
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Yokota, Hiroko, primary and Uesu, Yoshiaki, additional
- Published
- 2007
- Full Text
- View/download PDF
16. Effect of hemodynamic factors in renal glomerulus II. Cytochemistry of glomerular basement membrane and mesangium in the experimental congestive kidney.
- Author
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YOKOTA, HIROKO, primary and OGAWA, KAZUO, additional
- Published
- 1982
- Full Text
- View/download PDF
17. Effect of hemodynamic factors in renal glomerulus. I. Alterations of glomerular basement membrane in the experimental congestive kidney.
- Author
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YOKOTA, HIROKO, primary and OGAWA, KAZUO, additional
- Published
- 1981
- Full Text
- View/download PDF
18. ULTRASTRUCTURAL STUDIES ON THE ALTERATIONS IN THE GLOMERULAR CELLULAR COMPONENTS AND MESANGIAL MATRIX IN THE EXPERIMENTAL CONGESTIVE KIDNEY OF RABBITS
- Author
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YOKOTA, HIROKO, primary and OGAWA, KAZUO, additional
- Published
- 1982
- Full Text
- View/download PDF
19. Local-scale structures across the morphotropic phase boundary in PbZr 1- x Ti x O 3 .
- Author
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Zhang N, Yokota H, Glazer AM, Keen DA, Gorfman S, Thomas PA, Ren W, and Ye ZG
- Abstract
Lead zirconate titanate (PZT) is one of the most widely studied piezoelectric materials, mainly because of its 'mysterious' relationship between the so-called morphotropic phase boundary (MPB) and its strong piezoelectric coupling factor. Using results from a pair distribution function analysis, this paper examines how the complex local structure in PZT affects the long-range average structure across the MPB. A monoclinic M
C type structure is discovered in PZT. A first-order transformation between the monoclinic MA and MC components in both the average and local structures explains the sudden change in piezoelectric effect around these compositions. The role of polarization rotation in the enhancement of the piezoelectric properties is discussed with respect to the composition of PZT. The structure-property relationship that is revealed by this study explains the unique properties of PZT, and may be applicable in the design of new MPB-type functional materials.- Published
- 2018
- Full Text
- View/download PDF
20. The not so simple cubic structure of PbZr(1-x)Ti(x)O3 (PZT): complex local structural effects in perovskites.
- Author
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Zhang N, Yokota H, Glazer AM, and Thomas PA
- Abstract
High-resolution neutron diffraction on the important piezoelectric lead zirconate titanate (PZT) has found that oxygen disorder exists well into the cubic phase. This unexpected result shows that within this phase there persists a remnant of the tilted oxygen octahedra present within the room-temperature ferroelectric phase. The result is that the cubic phase, far from having a simple crystal structure, exhibits a more complex local structure than had hitherto been thought., (© 2011 International Union of Crystallography. Printed in Singapore – all rights reserved.)
- Published
- 2011
- Full Text
- View/download PDF
21. Identification of the human IAI.3B promoter element and its use in the construction of a replication-selective adenovirus for ovarian cancer therapy.
- Author
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Hamada K, Kohno S, Iwamoto M, Yokota H, Okada M, Tagawa M, Hirose S, Yamasaki K, Shirakata Y, Hashimoto K, and Ito M
- Subjects
- Adenoviridae physiology, Carcinoma, Squamous Cell genetics, Carcinoma, Squamous Cell metabolism, Carcinoma, Squamous Cell pathology, Carcinoma, Squamous Cell therapy, Cell Division genetics, Female, Genetic Vectors genetics, Humans, Ovarian Neoplasms metabolism, Ovarian Neoplasms pathology, Promoter Regions, Genetic, RNA, Messenger biosynthesis, RNA, Messenger genetics, Transfection, Virus Replication, Adenoviridae genetics, Genetic Therapy methods, Ovarian Neoplasms genetics, Ovarian Neoplasms therapy
- Abstract
Little is known concerning promoters or gene therapy specific for ovarian cancer. To explore the potential use of IAI.3B isolated from ovarian cancer cells in gene therapy for ovarian cancer, we identified the promoter region of the IAI.3B gene and created a replication-selective adenovirus, AdE3-IAI.3B, driven by the promoter. Transient transfection experiments showed that the DNA segment located between -1816 and -1 bp resulted in preferential expression in ovarian cancer cells with negligible expression in squamous cell carcinoma and normal cells. The promoter activity of IAI.3B was almost the same as that of cytomegalovirus and an order of magnitude higher than those of midkine and cyclooxygenase-2 in ovarian cancer cells. AdE3-IAI.3B replicated as efficiently as the wild-type adenovirus and caused extensive cell killing in a panel of ovarian cancer cells in vitro. In contrast, squamous cell carcinoma and normal cells were not able to support AdE3-IAI.3B replication. In animal studies, AdE3-IAI.3B administered to flank and i.p. xenografts of ovarian cancer cells led to a significant therapeutic effect. These results demonstrate the usefulness of the IAI.3B promoter for generation of ovarian cancer-specific adenoviral vectors and provide a potential for the development of ovarian cancer-specific oncolytic viral therapies.
- Published
- 2003
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