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日本东北福岛县西南部观测的剪切波分裂

世界地震译丛 1996年第2期27卷 68-76页

作者： T.Okada T.Matsuzawa S.Matsumoto K.Nida A.Ito a.hasegawa 杨导声浙江省地震局

我们研究了日本东北福岛县西南地区的剪切波偏振各向异性。研究的数据是从东北大学和字都宫大学的区域地震台网得到的。我们采用互相关方法,检测剪切波的分裂。对福岛县西南地区地下的浅源地震观测到的快剪切波振动方向(FSOD)呈NW-SE走... 详细信息

我们研究了日本东北福岛县西南地区的剪切波偏振各向异性。研究的数据是从东北大学和字都宫大学的区域地震台网得到的。我们采用互相关方法,检测剪切波的分裂。对福岛县西南地区地下的浅源地震观测到的快剪切波振动方向(FSOD)呈NW-SE走向。观测到的延迟时间小于0.1s,在地震活动水平高的地区,(延迟时间)值趋向增大。对中等深度地震,观测的快剪切波振动方向平行于消减板块倾斜的方向,大部分观测到的延迟时间小于1s。在这些观测的基础上,我们估计了各向异性的位置和成因。在福岛县西南地区地下的上地壳中,估计各向异性主要是由构造应力控制的破裂的优势取向产生的。

关键词：地震观测剪切波分裂地震活动性

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平板轧制模型实验中的滑移线场及应力分布

模具技术 1986年第5期 101-108页

作者： T.Nishitani a.hasegawa 吕争元王健飞

一、前言轧制理论的目的在于建立外加载荷与被轧制条料的机械性能之间的关系。在板料轧制中,有关完全刚塑性条料或理想加工硬化条料的滑移线场和应力分布,目前已有许多理论性的研究。然而,这些理论分析中所用假设的合理性到目前为止还... 详细信息

一、前言轧制理论的目的在于建立外加载荷与被轧制条料的机械性能之间的关系。在板料轧制中,有关完全刚塑性条料或理想加工硬化条料的滑移线场和应力分布,目前已有许多理论性的研究。然而,这些理论分析中所用假设的合理性到目前为止还只是部分得到了验证。为了求得轧制压力,虽然已进行了一些实验,但其结果和相应的实际应力状态之间的关系还没有得到充分研究。造成这种情况的主要原因似乎是目前还没有研究出一种合适的方法来测量这种

关键词：应力状态压应力受力状态滑移线场条料主应力差粘弹塑性变形单位轧制压力应力分布轧制模型单元体各向同性点塑性应变塑性变形

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日本地壳大地震的位置及成因的证据

世界地震译丛 2001年第5期32卷 28-42页

作者：赵大鹏 F.Ochi a.hasegawa A.Yamamoto 雷建设中国科技大学研究生院

1885～1999年的115年间日本地壳中的大地震(震级5.7～8.0,深度0～20 km)发生在由地震层析成像揭示出的低速区及其周围。低速区可能代表孕震地壳的薄弱部分。地壳弱化被认为与该区内太平洋板块和菲律宾海板块的俯冲密切相关。沿火山前沿... 详细信息

1885～1999年的115年间日本地壳中的大地震(震级5.7～8.0,深度0～20 km)发生在由地震层析成像揭示出的低速区及其周围。低速区可能代表孕震地壳的薄弱部分。地壳弱化被认为与该区内太平洋板块和菲律宾海板块的俯冲密切相关。沿火山前沿及弧后区的地壳弱化可能是由活火山及岩浆房造成的。在弧前区,在地震震源区探测到了流体,这种流体可能会促使地壳弱化和破裂成核。流体可能与俯冲的菲律宾海板块的脱水作用有关。这些结果表明,地壳中的大地震并非在什么地方都会发生,而仅发生在用地球物理方法可能会探测到的异常区内。

关键词：地壳成因地震层析成像日本俯冲带流体脱水作用

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伽师强震群区散射系数层析成像的研究

伽师强震群区散射系数层析成像的研究

Dendritic Learning-Incorporated Vision Transformer for Image Recognition

中国地球物理学会第22届年会

作者：王勤彩陈章立 Y.Asano a．hasegawa 中国地震局地震预测研究所中国地震局地震预测研究所国家地球科学与防灾研究所东北大学地震与火山喷发预测研究中心

＜正＞尾波是S波的散射波,对小尺度结构非常敏感。Nishigami（1991,1997,2000）和Asano（2004a, 2004b）用尾波包络线方法研究了强震区和火山地区的散射系数层析成像。他们发现充满水的裂隙和岩浆囊能有效的散射地震波,而研究人员也发...

＜正＞尾波是S波的散射波,对小尺度结构非常敏感。Nishigami（1991,1997,2000）和Asano（2004a, 2004b）用尾波包络线方法研究了强震区和火山地区的散射系数层析成像。他们发现充满水的裂隙和岩浆囊能有效的散射地震波,而研究人员也发现了充水裂隙和岩浆对地震孕育的影响,所以尾波散射系数层析成像在研究震源区的精细结构和孕震环境方面是一种非常有前途的方法;散射系数层析成像方法即使只有较少的观测资料,只要台站、地震较均匀分布就能得到很好的结果,所以此方法也是一种

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IEEE/CAA Journal of Automatica Sinica 2024年第2期11卷 539-541页

作者： Zhiming Zhang Zhenyu Lei Masaaki Omura Hideyuki hasegawa Shangce Gao Faculty of Engineering University of ToyamaToyama-shi 930-8555Japan IEEE

Dear Editor,This letter proposes to integrate dendritic learnable network architecture with Vision Transformer to improve the accuracy of image *** this study,based on the theory of dendritic neurons in neuroscience,we design a network that is more practical for engineering to classify visual *** on this,we propose a dendritic learning-incorporated vision Transformer(DVT),which out-performs other state-of-the-art methods on three image recognition benchmarks.

关键词： Image network image

Stevens–Johnson syndrome and toxic epidermal necrolysis: Updates in pathophysiology and management

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中华医学杂志(英文版) 2024年第19期137卷 2024 Sep 5页

作者： hasegawa Akito Abe Riichiro Division of Dermatology Niigata University Graduate School of Medical and Dental Sciences Niigata-8510 Japan

Stevens–Johnson syndrome (SJS) and toxic epidermal necrolysis (TEN) are life-threatening conditions characterized by extensive detachment of the epidermis and mucous membranes. These severe disorders carry a high mortality rate, and their pathogenesis remains largely unclear. Furthermore, optimal therapeutic strategies for SJS/TEN remain a subject of ongoing debate. Early diagnosis of SJS/TEN is challenging, and reliable biomarkers for diagnosis or severity prediction have not been firmly established. Certain drugs, such as carbamazepine and allopurinol, have shown a strong association with specific human leukocyte antigen (HLA) types. Recently, the potential benefits of HLA screening prior to administering these drugs to reduce the incidence of SJS/TEN have been explored. Epidermal cell death in SJS/TEN lesions is caused by extensive apoptosis, primarily through the Fas–Fas ligand (FasL) and perforin/granzyme pathways. Our findings suggest that necroptosis, a form of programmed necrosis, also contributes to epidermal cell death. Annexin A1, released from monocytes, interacts with the formyl peptide receptor 1 to induce necroptosis. Several biomarkers, such as CC chemokine ligand (CCL)-27, interleukin-15, galectin-7, receptor-interacting protein kinases 3 (RIP3), and lipocalin-2, have been identified for diagnostic and prognostic purposes in SJS/TEN. Supportive care is recommended for treating SJS/TEN, but the efficacy of various therapeutic options–including systemic corticosteroids, intravenous immunoglobulin, cyclosporine, and tumor necrosis factor-α antagonists–remains controversial. Recent studies have investigated the potential benefits of tumor necrosis factor-α antagonists. In this review, we discuss recent advances in the understanding and management of SJS/TEN.

关键词： Stevens-Johnson syndrome Toxic epidermal necrolysis Necroptosis Apoptosis

Update on the Diagnosis and Treatment of Combined Hepatocellular Cholangiocarcinoma

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Journal of Clinical and Translational Hepatology 2024年第2期12卷 210-217页

作者： Kai-Jian Chu Yoshikuni Kawaguchi Han Wang Xiao-Qing Jiang Kiyoshi hasegawa Biliary Surgical Department No.1 Eastern Hepatobiliary Surgical HospitalThe Naval Medical UniversityShanghaiChina Hepato-Biliary-Pancreatic Surgery Division Department of SurgeryGraduate School of MedicineThe University of TokyoTokyoJapan Department of Pathology Eastern Hepatobiliary Surgical HospitalThe Naval Medical UniversityShanghaiChina

Combined hepatocellular-cholangiocarcinoma(cHCC-CCA)is a unique type of liver tumor that contains both hepatocellular carcinoma and cholangiocarcinoma components within a single *** fifth edition of the World Health Organization classification provides a definition and diagnostic criteria for ***,the heterogeneous histomorphology and presentation resulting from variation of the proportion of each component poses challenges for clinical diagnosis and treatment.A diagnosis of cHCC-CCA may be suggested by the synchronous elevation of serum tumor markers for hepatocellular carcinoma and cholangiocarcinoma,a mixed enhancement pattern on imaging,and a discrepancy between the elevation of tumor marker and the imaging enhancement *** examination using hematoxylin and eosin staining is considered the gold standard for diagnosing cHCC-CCA,and comprehensive examination of resection or biopsy specimens is crucial for an accurate ***,there is no standard treatment for cHCC-CCA,and surgery is the *** hepatectomy with lymphadenectomy is among the recommended surgical *** role of liver transplantation in the management of cHCC-CCA is still *** chemoembolization may be effective for unresectable cHCC-CCA,particularly for hypervascular ***,the available evidence does not support systemic therapy for advanced *** prognosis of cHCC-CCA is generally poor,and there is no established staging *** research is needed to better understand the histogenesis and clinical management of *** review provides an overview of the current literature on cHCC-CCA with a focus on its clinical characteristics,pathological diagnosis,and management.

关键词： Combined hepatocellular-cholangiocarcinoma Clinical characteristics Imaging characteristics Pathological diagnosis Treatment

Dynamic ultrasonography for optimizing treatment position in superior mesenteric artery syndrome:Two case reports and review of literature

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World Journal of Gastroenterology 2024年第5期30卷 499-508页

作者： Nobuaki hasegawa Akihiko Oka Muyiwa Awoniyi Yuri Yoshida Hiroshi Tobita Norihisa Ishimura Shunji Ishihara Department of Internal Medicine II Shimane University Faculty of MedicineIzumo 693-8501ShimaneJapan Department of Gastroenterology Hepatology and NutritionDigestive Disease and Surgery InstituteHepatology SectionCleveland ClinicClevelandOH 44195United States Clinical Laboratory Division Shimane University HospitalIzumo 693-8501ShimaneJapan Division of Hepatology Shimane University HospitalIzumo 693-8501Japan

BACKGROUND Superior mesenteric artery(SMA)syndrome is a rare cause of duodenal obstruction by extrinsic compression between the SMA and the aorta(SMA-Ao).Although the left lateral recumbent position is considered effective in the treatment of SMA syndrome,individual variations in the optimal patient position have been *** this report,we present two elderly cases of SMA syndrome that exhibited rapid recovery due to ultrasonographic dynamic evaluation of the optimal position for each *** SUMMARY Case 1:A 90-year-old man with nausea and *** diagnosis of SMA syndrome by computed tomography(CT),ultrasonography(US)revealed the SMA-Ao distance in the supine position(4 mm),which slightly improved in the lateral position(5.7–7.0 mm)without the passage of duodenal ***,in the sitting position,the SMA-Ao distance was increased to 15 mm accompanied by improved content ***,US indicated enhanced passage upon abdominal massage on the right *** day 2,the patient could eat comfortably with the optimal position and *** 2:An 87-year-old woman with *** the diagnosis of SMA syndrome and aspiration pneumonia by CT,dynamic US confirmed the optimal position(SMA-Ao distance was improved to 7 mm in forward-bent position,whereas it remained at 5 mm in the supine position).By day 7 when her pneumonia recovered,she could eat with the optimal *** The optimal position for SMA syndrome varies among *** US appears to be a valuable tool in improving patient outcomes.

关键词： Superior mesenteric artery syndrome Wilkie’s syndrome Cast syndrome Aorto-mesenteric compass syndrome Ultrasonography Case report

High-temperature corrosion of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho)environmental barrier coating materials by volcanic ash

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1628-1638页

作者： Ayahisa Okawa Son Thanh Nguyen Tadachika Nakayama Thi-Mai-Dung Do Hisayuki Suematsu Shu Yin Takuya.hasegawa Tsuneo Suzuki Takashi Goto Koichi Niihara Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan Department of Creative Engineering National Institute of TechnologyKushiro 084-0916Japan Extreme Energy-Density Research Institute Nagaoka University of TechnologyNagaoka 940-2188Japan Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan

Rare-earth silicates are promising environmental barrier coatings(EBCs)that can protect SiC_(f)/Si C_(m)substrates in next-genera tion gas turbine ***,RE_(2)Si_(2)O_(7)(RE=Yb and Ho)shows potential as an EBC due to its coefficient of thermal expansion(CTE)compatible with substrates and high resistance to water vapor *** target operating temperature for next-generation tur bine blades is 1400°*** is inevitable during adhesion to molten volcanic ash,and thus,understanding the corrosion behavior o the material is crucial to its *** study investigates the high-temperature corrosion behavior of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho).Samples were prepared using a solid-state reaction and hot-press *** were then exposed to volcanic ash at 1400°C for 224,and 48 *** 48 h of exposure,volcanic ash did not react with Yb_(2)Si_(2)O_(7)but penetrated its interior,causing *** Ho_(2)Si_(2)O_(7)was partially dissolved in the molten volcanic ash,forming a reaction zone that prevented volcanic ash melts from penetrating the *** increasing heat treatment time,the reaction zone expanded,and the thickness of the acicular apatite grains increased The Ca:Si ratios in the residual volcanic ash were mostly unchanged for Yb_(2)Si_(2)O_(7)but decreased considerably over time for Ho_(2)Si_(2)O_(7).Th Ca in volcanic ash was consumed and formed apatite,indicating that RE^(3+)ions with large ionic radii(Ho>Yb)easily precipitated apatit from the volcanic ash.

关键词： environmental barrier coating volcanic ash rare-earth disilicate corrosion