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无绝缘REBCO饼型线圈变形引起的特性电阻变化

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Acta Mechanica Sinica 2024年第4期40卷 21-26页

作者： So Noguchi Hokkaido University Kita 14 Nishi 9Kita-kuSapporo060-0814Japan

近年来稀土钡铜氧化物(REBCO)饼型线圈在高磁场产生中的变形引起了人们的关注.一些考虑线圈变形的电流模拟显示了线圈变形可能影响屏蔽电流分布的可能性.屏蔽电流会产生强大的电磁力,对REBCO饼型线圈造成机械损伤.然而,线圈变形也可能... 详细信息

近年来稀土钡铜氧化物(REBCO)饼型线圈在高磁场产生中的变形引起了人们的关注.一些考虑线圈变形的电流模拟显示了线圈变形可能影响屏蔽电流分布的可能性.屏蔽电流会产生强大的电磁力,对REBCO饼型线圈造成机械损伤.然而,线圈变形也可能影响无绝缘(NI)REBCO饼型线圈的接触电阻,通常称为“特性电阻”.NI特性电阻是NI REBCO饼型线圈稳定性的一个重要因素.因此,有必要研究随着线圈形状变形的NI接触电阻.本文展示了外部场充电和NI线圈充电期间NI特性电阻的变化.

关键词：屏蔽电流接触电阻线圈变形铜氧化物 REBCO 电阻变化机械损伤电磁力

The influence of inter-band rock on rib spalling in longwall panel with large mining height

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International Journal of Mining Science and Technology 2024年第4期34卷 427-442页

作者： Jiachen Wang Meng Li Zhaohui Wang Zheng Li Han Zhang Shixiong Song School of Energy and Mining Engineering China University of Mining and Technology-BeijingBeijing 100083China Coal Industry Engineering Research Center of Top-coal Caving Mining Beijing 100083China Faculty of Engineering Hokkaido UniversitySapporo 060-8628Japan

In order to improve rib stability,failure criteria and instability mode of a thick coal seam with inter-band rock layer are analysed in this study.A three-dimensional mechanical model is established for the rib by considering the rock layer.A safety factor is defined foy the rib,and it is observed that the safety factor exhibits a positive correlation with the thickness and strength of the inter-band rock.A calculation method for determining critical parameters of the rock layer is presented to ensure the rib *** is revealed that incomplete propagation of the fracture at the hard rock constitutes a fundamental prerequisite for ensuring the rib *** influence of the position of the inter-band rock in the coal seam on failure mechanism of the rib was thoroughly investigated by developing a series of physical models for the rib at the face *** best position for the inter-band rock in the coal seam is at a height of 1.5 m away from the roof line,which tends to provide a good stability state for the *** different inter-band rock positions,two ways of controlling rib by increasing supports stiffness and flexible grouting reinforcement are proposed.

关键词： Rib spalling Inter-band rock Large mining height Limit analysis Physical model experiment Numerical simulation

γ-Butyrolactone Synthesis from Allylic Alcohols Using the CO_(2)Radical Anion

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Precision Chemistry 2024年第3期2卷 88-95页

作者： Saeesh R.Mangaonkar Hiroki Hayashi Wataru Kanna Suvankar Debbarma Yu Harabuchi Satoshi Maeda Tsuyoshi Mita Institute for Chemical Reaction Design and Discovery(WPI-ICReDD) Hokkaido UniversitySapporoHokkaido 001-0021Japan JST ERATO Maeda Artificial Intelligence in Chemical Reaction Design and Discovery ProjectSapporoHokkaido 060-0810Japan Department of Chemistry Faculty of ScienceHokkaido UniversitySapporoHokkaido 060-0810Japan Research and Services Division of Materials Data and Integrated System(MaDIS) National Institute for Materials Science(NIMS)TsukubaIbaraki 305-0044Japan

γ-Butyrolactone structures are commonly found in various natural products and serve as crucial building blocks in organic ***,the development of methods for synthesizingγ-butyrolactones has garnered significant interest within the organic synthesis *** this study,we present a direct and highly efficient approach for the synthesis ofγ-butyrolactones from allylic ***,this study represents the first instance ofγ-butyrolactone synthesis initiated by radical hydrocarboxylation using CO_(2)^(•–),generated from metal formates,followed by *** two-step process is achieved through the synergistic interaction of photoredox and hydrogen atom transfer(HAT)catalysis,resulting in the production ofγ-butyrolactones with exceptional ***,when employingα,α-diaryl allylic alcohol derivatives as substrates,the reaction involves 1,2-aryl migration,which occurs concomitantly with CO_(2)^(•–)addition,leading to the formation of 4,5-substituted lactones in a good *** artificial force induced reaction(AFIR)method identified the preferred 1,2-aryl migration pathway along with potential byproduct pathways,in which the targeted 1,2-migration was found to be the most plausible pathway.

关键词： CO_(2) lactone radical photoredox visible light carboxylation calculation DFT

Editorial:Transcriptome analysis in tumor microenvironment and tumor heterogeneity

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Oncology Research 2024年第1期32卷 99-100页

作者： JINHUI LIU JIAHENG XIE PEIXIN DONG Department of Gynecology The First Affiliated Hospital of Nanjing Medical UniversityNanjing210029China Department of Plastic and Cosmetic Surgery Xiangya HospitalCentral South UniversityChangsha410008China Department of Obstetrics and Gynecology Hokkaido University School of MedicineHokkaido UniversitySapporo060-8638Japan

Cancer,a disease as intricate as it is devastating,continues to challenge the medical and scientific community[1].Its complex nature is epitomized by the tumor microenvironment and tumor *** we delve deeper into the realms of cancer research,the advent of transcriptome analysis has emerged as a powerful torchbearer,illuminating our understanding of these enigmatic facets of cancer biology[2].

关键词： heterogeneity. tumor Cancer

Metal-N_(4)model single‐atom catalyst with electroneutral quadri‐pyridine macrocyclic ligand for CO_(2)electroreduction

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Carbon Energy 2024年第8期6卷 122-133页

作者： Jian‐Zhao Peng Yin‐Long Li Yao‐Ti Cheng Fu‐Zhi Li Bo Cao Qing Wang Xian Yue Guo‐Tao Lai Yang‐Gang Wang Jun Gu Department of Chemistry Southern University of Science and TechnologyShenzhenGuangdongChina Institute for Catalysis Hokkaido UniversitySapporoJapan

Metal–N–C single‐atom catalysts,mostly prepared from pyrolysis of metalorganic precursors,are widely used in heterogeneous *** metal sites with diverse local structures coexist in this type of material and it is challenging to characterize the local structure,a reliable structure–property relationship is difficult to *** macrocyclic complexes adsorbed on carbon support are well‐defined models to mimic the singleatom ***–N_(4)site with four electroneutral pyridine‐type ligands embedded in a graphene layer is the most commonly proposed structure of the active site of single‐atom catalysts,but its molecular counterpart has not been *** this work,we synthesized the conjugated macrocyclic complexes with a metal center(Co,Fe,or Ni)coordinated with four electroneutral pyridinic ligands as model catalysts for CO_(2)*** comparison,the complexes with anionic quadri‐pyridine macrocyclic ligand were also *** Co complex with the electroneutral ligand expressed a turnover frequency of CO formation more than an order of magnitude higher than that of the Co complex with the anionic *** ab initio molecular dynamics simulations based on the well‐defined structures of the model catalysts indicate that the Co complex with the electroneutral ligand possesses a stronger ability to mediate electron transfer from carbon to CO_(2).

关键词： ab initio molecular dynamics CO_(2)reduction electrocatalysis model catalyst single‐atom catalyst

Hybrid structure of iron single atoms and metallic titanium for photothermal ethanol steam reforming

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Science China Chemistry 2024年第3期67卷 848-854页

作者： Dachao Yuan Guanda Han Zhixuan Wang Jianguo Zhao Kailuan Li Pengfei Wang Jianjun Hao Yaguang Li Jinhua Ye College of Mechanical and Electrical Engineering Technology Innovation Center of Intelligent Agricultural EquipmentHebei Agricultural UniversityBaoding 071001China Research Center for Solar Driven Carbon Neutrality The College of Physics Science and TechnologyInstitute of Life Science and Green DevelopmentHebei UniversityBaoding 071002China International Center for Materials Nanoarchitectonics(WPI-MANA) National Institute for Materials Science(NIMS)1-1 NamikiTsukubaIbaraki 305-0044Japan Graduate School of Chemical Science and Engineering Hokkaido UniversitySapporo 060-0814Japan

Photothermal ethanol steam reforming(ESR) is currently limited by low intrinsic activity and strong solar energy ***,we synthesized Fe single atoms supported on CeO_(2)(SA Fe-CeO_(2)) to exhibit excellent low-temperature ESR activity with a hydrogen production rate of 512 mmol g^(-1)h^(-1) at 350℃,becuase of the high oxidation state of Fe single atoms to weaken the reaction barrier of ethanol ***,a heterostructure of SA Fe-CeO_(2) and Ti foil could eliminate 66% of infrared radiation via the size effect,thus achieving a 3.5 sun-driven temperature of 347℃.Consequently,the heterostructure of SA Fe-CeO_(2) and Ti foil shows a hydrogen generation rate of 984 mmol g^(-1)h^(-1) of ESR and 11.31% of solar-to-hydrogen energy conversion efficiency,which outperforms other photothermal ethanol-hydrogen production *** study provides a new path for designing active catalytic sites and trapping light energy of photothermal catalysts.

关键词： photothermal catalysis single atoms heterostructure ethanol steam reforming iron

Correction:Current overview on the genetic basis of key genes involved in soybean domestication

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aBIOTECH 2024年第2期5卷 279-279页

作者： Sijia Lu Chao Fang Jun Abe Fanjiang Kong Baohui Liu Innovative Center of Molecular Genetics and Evolution School of Life SciencesGuangzhou UniversityGuangzhou 510006China Guangzhou Key Laboratory of Crop Gene Editing Guangzhou UniversityGuangzhou 510006China Research Faculty of Agriculture Hokkaido UniversitySapporoHokkaido 060-0808Japan

Correction:aBIOTECH(2022)3:126–139 https://***/10.1007/s42994-022-00074-5 The article‘‘Current overview on the genetic basis of key genes involved in soybean domestication’’,written by Sijia Lu,Chao Fang,Jun Abe,Fanjiang Kong and Baohui Liu,was originally published Online First without Open *** publication in volume 3,issue 2,pages 126–139 the authors decided to opt for Open Choice and to make the article an Open Access ***,the copyright of the article has been changed to The Authors 2024 and the article is forthwith distributed under the terms of the Creative Commons Attribution 4.0 International License,which permits use,sharing,adaptation,distribution and reproduction in any medium or format,as long as you give appropriate credit to the original author(s)and the source,provide a link to the Creative Commons licence,and indicate if changes were made.

关键词： soybean Open Access

Genetic and epigenetic characteristics of gastric cancers with JC virus T-antigen

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World Journal of Gastroenterology 2009年第44期15卷 5579-5585页

作者： Satoshi Yamaoka Hiroyuki Yamamoto Katsuhiko Nosho Hiroaki Taniguchi Yasushi Adachi Shigeru Sasaki Yoshiaki Arimura Kohzoh Imai Yasuhisa Shinomura First Department of Internal Medicine Sapporo Medical UniversitySapporo 060-8543 Japan sapporo Medical University Sapporo 060-8556 Japan

AIM： To clarify the significance of JC virus （JCV） T-antigen （T-Ag） expression in human gastric cancer. METHODS： We investigated the relationship between TAg detected by immunohistochemistry and Epstein- Barr virus （EBV） infection, microsatellite instability （MSI）, and genetic and epigenetic alterations in gastric cancers. Mutations in the p53,β-catenin, K/MS, BRAF, PIK3CA genes were analyzed by PCR- single strand conformation polymorphism and DNA sequencing. Allelic losses were determined by PCR at 7 microsatellite loci. Aberrant DNA methylation was analyzed by MethyLight assay. RESULTS： JCV T-Ag protein expression was found in 49% of 90 gastric cancer tissues. TAg positivity was not correlated with clinicopathological characteristics. TAg expression was detected in a similar percentage of EBV positive cancers （4 of 9, 44%） and EBV negative cancers （35 of 73, 48%）. TAg expression was detected in a significantly lower percentage of MSI-H cancers （14%） than in non MSI-H cancers （55%, P = 0.005）. TAg expression was detected in a significantly higher percentage of cancers with nuclear/cytoplasmic localization of β-catenin （15 of 21, 71%） than in cancers without （42%, P = 0.018）. p53 mutations were detected in a significantly lower percentage of T-Ag positive cancers （32%） than in TAg negative cancers （57%, P = 0.018）. TAg positive gastric cancers showed a significant increase in the allelic losses and aberrant methylation compared with T-Ag negative gastric cancers （P = 0.008 and P = 0.003）. CONCLUSION： The results suggest that JCV T-Ag is involved in gastric carcinogenesis through multiple mechanisms of genetic and epigenetic alterations.

关键词： JC virus T-antigen Epstein-Barr virus Microsatellite instability Gastric cancer

Overexpression of the receptor tyrosine kinase EphA4 in human gastric cancers

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World Journal of Gastroenterology 2008年第37期14卷 5650-5656页

作者： Mariko Oki Hiroyuki Yamamoto Hiroaki Taniguchi Yasushi Adachi Kohzoh Imai Yasuhisa Shinomura First Department of Internal Medicine Sapporo Medical University School of MedicineSapporo 060-8543 Japan sapporo Medical University Sapporo 060-8556 Japan

AIM: To clarify the expression and role of Ephrin receptor A4 (EphA4) in gastric cancer in relation to clinicopathological characteristics and the expression of fibroblast growth factor receptor 1 (FGFR1) and ephrin ligands. METHODS: Eleven gastric carcinoma cell lines, 24 paired surgical fresh specimens of gastric adenocarcinoma and adjacent nontumor tissue, 74 conventional formalin-fixed, paraffin-embedded tumor specimens, and 55 specimens spotted on tissue microarray (TMA) were analyzed. Reverse transcription-PCR (RT-PCR), real-time RT-PCR, immunohistochemistry, and cell growth assays were performed. RESULTS: Overexpression of EphA4 mRNA expres-sion was observed in 8 (73%) of 11 gastric cancer cell lines and 10 (42%) of 24 gastric cancer tissues. Over-expression of EphA4, analyzed by immunohistochemistry, was observed in 62 (48%) of 129 gastric cancer tissues. EphA4 overexpression, at the protein level, was significantly associated with depth of invasion and recurrence. EphA4 overexpression was also correlated with FGFR1 overexpression. Patients with EphA4-positive cancer had significantly shorter overall survival periods than did those with EphA4-negative cancer (P = 0.0008). The mRNAs for ephrin ligands were coexpressed in various combinations in gastric cancer cell lines and cancer tissues. Downregulation of EphA4 expression by siRNA in EphA4-overexpressing gastric cancer cell lines resulted in a significant decrease in cell growth. CONCLUSION: Our results suggest that overexpres-sion of EphA4 plays a role in gastric cancer.

关键词： Ephrin receptor A4 Gastric cancer Ephrin Fibroblast growth factor receptor 1 Prognosis