检索结果-南通市图书馆

Influence of texture feature size on spherical silicon solar cells

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 115-120页

作者： HAYASHI Shota MINEMOTO Takashi TAKAKURA hideyuki HAMAKAWA Yoshihiro College of Science and Engineering Ritsumeikan University 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan

The effects of surface texturing on spherical silicon solar cells were investigated. Surface texturing for spherical Si solar cells was prepared by immersing p-type spherical Si crystals in KOH solution with stirring. Two kinds of texture feature sizes (1 and 5 μm pyramids) were prepared by changing stirring speed. After fabrication through our baseline processes, these cells were evaluated by solar cell performance and external quantum efficiency. The cell with 1 and 5 μm pyramids shows the short circuit current density (Jsc) value of 31.9 and 33.2 mA·cm-2, which is 9% and 13% relative increase compared to the cell without texturing. Furthermore, the cell with 5 μm pyramids has a higher open-circuit voltage (0.589 V) than the cell with 1 μm pyramids (0.577 V). As a result, the conversion efficiency was improved from 11.4% for the cell without texturing to 12.1% for the cell with 5 μm pyramids.

关键词： solar cell spherical silicon texturing alkali etching

The prospects of regenerative medicine combined with rehabilitative approaches for chronic spinal cord injury animal models

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2017年第1期12卷 43-46页

作者： Syoichi Tashiro Masaya Nakamura hideyuki Okano Department of Rehabilitation Medicine Keio University School of MedicineTokyoJapan Department of Orthopaedic Surgery Keio University School of MedicineTokyoJapan Department of Physiology Keio University School of MedicineTokyoJapan

Regenerative medicine has opened a window for functional recovery in acute-to-subacute phase spinal cord injury（SCI）.By contrast,there are still only a few studies have focused on the treatment of the chronically injured spinal cord,in which cell-based regenerative medicine seems less *** the majority of SCI patients are in the chronic phase,representing a major challenge for the clinical application of cellbased regenerative *** combined therapies for the treatment of chronic SCI have attracted attention of researchers and its potential importance is also widely recognized,there had been very few studies involving rehabilitative treatments to *** a recent study,we have demonstrated for the first time that treadmill training combined with cell transplantation significantly promotes functional recovery even in chronic SCI,not only in additive but also in synergistic *** though we have succeeded to outline the profiles of recovery secondary to the combination therapy,the mechanism underlying the effects remain *** this review article,we summarize the present progress and consider the prospect of the cell-based regenerative medicine particularly combined with rehabilitative approaches for chronic SCI animal models.

关键词： transplantation spinal cord injury regenerative medicine chronic phase rehabilitation treadmill training

Role of microRNAs in gastric cancer

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第19期20卷 5694-5699页

作者： hideyuki Ishiguro Masahiro Kimura Hiromitsu Takeyama Department of Gastroenterological Surgery Nagoya City University Graduate School of Medical SciencesNagoya 467-8601Japan

Although gastric cancer(GC)is one of the leading causes of cancer-related death,major therapeutic advances have not been made,and patients with GC still face poor *** prognosis of GC also remains poor because the molecular mechanisms of GC progression are incompletely ***(miRNAs)are noncoding RNAs that are associated with gastric *** investigating the regulation of gene expression by miRNAs have made considerable progress in recent years,and abnormalities in miRNA expression have been shown to be associated with the occurrence and progression of *** contribute to gastric carcinogenesis by altering the expression of oncogenes and tumor suppressors,affecting cell proliferation,apoptosis,motility,and ***,a number of miRNAs have been shown to be associated with tumor type,tumor stage,and patient survival and therefore may be developed as novel diagnostic or prognostic *** this review,we discuss the involvement of miRNAs in GC and the mechanisms through which they regulate gene expression and biological ***,we review recent research on the involvement of miRNAs in GC prognosis,their potential use in chemotherapy,and their effects on Helicobacter pylori infections in GC.A greater understanding of the roles of miRNAs in gastric carcinogenesis could provide insights into the mechanisms of tumor development and could help to identify novel therapeutic targets.

关键词： MicroRNA Gastric cancer Reverse transcription-polymerase chain reaction Chemosensitivity Helicobacter pylori Circulating MicroRNA

Spherical silicon solar cell with reflector cup fabricated by decompression dropping method

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 121-126页

作者： MINEMOTO Takashi OKAMOTO Chikao MUROZONO Mikio TAKAKURA hideyuki HAMAKAWA Yoshihiro College of Science and Engineering Ritsumeikan University 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan Clean Venture 21 Co. Ltd. 35 Kamitoba Daimotsu-chou Minami-ku Kyoto 601-8121 Japan

A spherical Si solar cell with a reflector cup was successfully fabricated by a dropping method at decompression state. In the dropping method, melted Si droplets were instilled at decompression state (0.5×105 Pa) to reduce crystal growth rate, dominating crystal quality such as dislocation density in crystal grains. Spherical Si solar cells were fabricated using the spherical Si crystals with a diameter of 1 mm and then mounted on a reflector cup. The current-voltage measurement of the solar cell shows an energy conversion efficiency of 11.1% (short-circuit current density (Jsc): 24.7 mA·cm-2, open-circuit voltage: 601 mV, fill factor: 74.6%). Minority carrier diffusion length determined by surface photovoltage method was 98 μm. This value can be enhanced by the improvement of crystal quality of spherical Si crystals. These results demonstrate that spherical Si crystals fabricated by the dropping method has a great potential for substrate material of high-efficiency and low-cost solar cells.

关键词： spherical Si solar cell dropping method decompression state

Impact of thermal history of spherical silicon crystal on its crystal quality

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2006年第z1期25卷 127-132页

作者： TSUJIYA Kaoru MINEMOTO Takashi MUROZONO Mikio TAKAKURA hideyuki HAMAKAWA Yoshihiro College of Science and Engineering Ritsumeikan University 1-1-1 Nojihigashi Kusatsu Shiga 525-8577 Japan Clean Venture 21 Co. Ltd. 35 Kamitoba Daimotsu-chou Minami-ku Kyoto 601-8121 Japan

Spherical Si solar cells were fabricated based on multicrystalline Si spheres produced by a dropping method. The thermal history of Si spheres were calculated by numerical simulation. The simulation result reveals that heat transfered by convection is greater than heat transfered by radiation. Considering the calculation results, Si spheres were dropped in the free-fall tower at low pressure state (0.2×105-0.5×105 Pa) to slow heat transfer by convection. After dash etching for 60 min, low pressure Si spheres have less etch pits, i.e., 80% for etch pit density and 8% for etch pit-area ratio compared to normal one. Furthermore, the conversion efficiency was improved from 6.57% (normal pressure spherical Si solar cell) to 9.56% (low one), which is 45% relative increase. The improvement is due to decrease of undercooling and increase of crystal growth duration. These results demonstrate that the dropping method at low pressure state is useful for fabricating high performance spherical Si solar cells.

关键词： solar cell sphere silicon undercooling low pressure thermal history etch pit

Conjugate Heat Transfer Analysis of Film Cooling Flows

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2006年第1期15卷 85-91页

作者： Xiaochen LU Peixue JIANG Hideaki SUGISHITA hideyuki UECHI Kiyoshi SUENAGA Department of Thermal Engineering Tsinghua University Beijing 100084 China Takasago Research and Development Center Mitsubishi Heavy Industries Ltd. Takasago 676-8686 Japan

The objective of this study is to evaluate the potential of various grids to satisfactorily simulate the development of a cooling film, using a coupled computation that takes into account the full geometry. Detailed computations of a single row of 30 degrees round holes on a flat plate are presented for blowing ratios of 0.764, 1.01 and 1.54. The simulation results are compared well with experimental data. The two-layer model gave more accurate results but consumed much more computational time than the standard wall functions. The k-ε turbulence model with wall functions with appropriate values of y^＋ is suitable for practical use. The results show the importance of the conjugate calculation for accurately describing the influence of the heat transfer within the cooling film.

关键词： film cooling conjugate heat transfer blowing ratio.

Molecular pathogenesis of sporadiccolorectal cancers

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Cancer 2016年第1期35卷 12-19页

作者： Hidetsugu Yamagishi Hajime Kuroda Yasuo Imai hideyuki Hiraishi Department of Diagnostic Pathology Dokkyo Medical University880 Kita‑KobayashiMibuShimotsugaTochigi 321‑0293Japan Department of Pathology International University of Health and Welfare Hospital537‑3 IguchiNasushiobaraTochigi 329‑2763Japan Department of Diagnostic Pathology Ota Memorial HospitalFuji Heavy Industries Health Insurance Society455‑1 OshimaOtaGunma 373‑8585Japan Department of Gastroenterology Dokkyo Medical University880 Kita‑KobayashiMibuShimotsugaTochigi 321‑0293Japan.

Colorectal cancer(CRC)results from the progressive accumulation of genetic and epigenetic alterations that lead to the transformation of normal colonic mucosa to *** 75%of CRCs are sporadic and occur in people without genetic predisposition or family history of *** the past two decades,sporadic CRCs were classified into three major groups according to frequently altered/mutated *** genes have been identified by linkage analyses of cancer-prone families and by individual mutation analyses of candidate genes selected on the basis of functional *** the first half of this review,we describe the genetic pathways of sporadic CRCs and their clinicopathologic ***,large-scale genome analyses have detected many infrequently mutated genes as well as a small number of frequently mutated *** infrequently mutated genes are likely described in a limited number of ***-oriented models of CRC progression are being replaced by pathway-oriented *** the second half of this review,we summarize the present knowledge of this research field and discuss its prospects.

关键词： Sporadic colorectal cancer, Pathogenesis, Morphology, Large-scale genome analysis, Genetic pathway

Mechanophore activation enhanced by hydrogen bonding of diarylurea motifs:An efficient supramolecular force-transducing system

在线全文

学校读者我要写书评

暂无评论

Aggregate

Aggregate 2021年第3期2卷 9-13页

作者： Jumpei Kida Daisuke Aoki hideyuki Otsuka Department of Chemical Science and Engineering Tokyo Institute of TechnologyMeguro-kuTokyoJapan

Macromolecules are efficient as mechanical transducers for mechanically induced chemical bond cleavage *** various classes of polymers have been studied as effective mechanical-force transducers for mechanophores,alternatives to polymer chains,that is,small molecules,have rarely been *** this paper,the role of hydrogen bonding as small-molecule mechanical-force transducers for the activation of mechano-responsive molecular units(mechanophores)in the bulk is *** introduction of diarylurea linkage motifs,which are known as strong hydrogen bonding groups,enhances the mechanochemical activation of the fluorescent mechanophore tetraarylsuccinonitrile(TASN)as effectively as the attachment of a typical macromolecular *** paramagnetic resonance measurements of mechanically activated TASN with diphenyl urea motifs demonstrate its higher carbon–carbon bond dissociation ratio compared to that of TASN without diphenyl urea *** efficient supramolecular-forcetransducing system represents a new concept in the field of mechanochemistry,namely,the enhancement of mechanochemical bond scission by simply changing the substituents of a mechanophore,even in small molecules.

关键词： hydrogen bonding mechanophore radical

Photodimerization and photooxygenation of 9-vinylcarbazole catalyzed by titanium dioxide and magnesium perchlorate

维普期刊数据库评论

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 Chemical Letters 2010年第3期21卷 365-368页

作者： Hajime Maeda Mio Yamamoto hideyuki Nakagawa Kazuhiko Mizuno Division of Material Sciences Graduate School of Natural Science and TechnologyKanazawa University Department of Applied Chemistry Graduate School of EngineeringOsaka Prefecture University

Photoreaction of 9-vinylcarbazole in acetonitrile in the presence of titanium dioxide and a catalytic amount of magnesium perchlorate gave 3,6-di(9-carbazolyl)-1,2-dioxane as a photooxygenated product via photodimerization of *** photoreaction proceeds via an electron transfer mechanism,where magnesium perchlorate accelerated formation of the photo-oxygenated product.

关键词： Titanium dioxide Magnesium perchlorate 9-Vinylcarbazole Photooxygenation Photodimerization