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Ansa pancreatica as a predisposing factor for recurrent acute pancreatitis

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World Journal of Gastroenterology 2016年第40期22卷 8940-8948页

作者： Takana Yamakawa hayashi Wataru Gonoi Takeharu Yoshikawa Naoto hayashi Kuni Ohtomo Department of Radiology Graduate School of Medicine The University of Tokyo Department of Computational Diagnostic Radiology and Preventive Medicine The University of Tokyo

AIM To determine the non-biased prevalence and clinical significance of ansa pancreatica in patients with acute pancreatitis using magnetic resonance imaging(MRI).METHODS Our institutional review board approved this crosssectional study, which consisted of a community-based cohort of 587 consecutive participants in a whole-body health-check program, and 73 subjects with episode of acute pancreatitis(55 patients with a single episode of acute pancreatitis, and 18 patients with recurrent acute pancreatitis). All of the subjects underwent abdominal MRI including magnetic resonance cholangiopancreatography, medical examinations, and blood tests. Two board-certified, diagnostic, abdominal radiologists evaluated the images, and ansa pancreatica was diagnosed based on its characteristic anatomy on *** Compared with the community group [5/587(0.85%)], patients with recurrent acute pancreatitis had a significantly higher frequency of ansa pancreatica [2/18(11.1%)](P = 0.016; OR = 14.3; 95%CI: 1.27-96.1), but not compared with patients with single-episode acute pancreatitis [1/55(1.8%)](P = 0.42; OR = 2.1; 95%CI: 0.44-19.7). Multiple logistic regression analysis using age, alcohol intake, presence of ansa pancreatica, and presence of autoimmune disease as independent covariates, revealed a significant relationship between the presence of ansa pancreatica and recurrent acute pancreatitis. The presence of autoimmune disease was also significantly associated with the onset of recurrent acute pancreatitis. On the other hand, neither age nor alcohol intake were significantly related to the onset of recurrent acute *** The present study is the first to provide robust evidence that the presence of ansa pancreatica is significantly associated with recurrent acute pancreatitis.

关键词： Anatomy Cholangiopancreatography Pancreatitis Magnetic resonance imaging Pancreatic duct

Influence of texture feature size on spherical silicon solar cells

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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

RadonPy:automated physical property calculation using all-atom classical molecular dynamics simulations for polymer informatics

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npj Computational Materials 2022年第1期8卷 2155-2169页

作者： Yoshihiro hayashi Junichiro Shiomi Junko Morikawa Ryo Yoshida The Institute of Statistical Mathematics(ISM) Research Organization of Information and Systems10-3 Midori-choTachikawaTokyo190-8562Japan Department of Mechanical Engineering The University of Tokyo7-3-1 HongoBunkyoTokyo113-8656Japan Institute of Engineering Innovation The University of Tokyo2-11 YayoiBunkyo-kuTokyo113-0032Japan Department of Materials Science and Engineering School of Materials and Chemical TechnologyTokyo Institute of Technology2-12-1 OokayamaMeguro-kuTokyo152-8552Japan Research and Services Division of Materials Data and Integrated System(MaDIS) National Institute for Materials Science(NIMS)1-2-1 SengenTsukubaIbaraki305-0047Japan Department of Statistical Science School of Multidisciplinary ScienceThe Graduate University of Advanced Studies(SOKENDAI)10-3 Midori-choTachikawaTokyo190-8562Japan

The spread of data-driven materials research has increased the need for systematically designed materials property ***,the development of polymer databases has lagged far behind other material *** present RadonPy,an open-source library that can automate the complete process of all-atom classical molecular dynamics(MD)simulations applicable to a wide variety of polymeric ***,15 different properties were calculated for more than 1000 amorphous *** MD-calculated properties were systematically compared with experimental data to validate the calculation conditions;the bias and variance in the MD-calculated properties were successfully calibrated by a machine learning *** the high-throughput data production,we identified eight amorphous polymers with extremely high thermal conductivity(>0.4 W∙m^(–1)∙K^(–1))and their underlying *** to the advancement of materials informatics since the advent of computational property databases for inorganic crystals,database construction using RadonPy will promote the development of polymer informatics.

关键词： property calculation dynamics

Mechanism of Tonal Noise Generation from Circular Cylinder with Spiral Fin

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Journal of Thermal Science 2014年第6期23卷 552-557页

作者： Ryo Yamashita Hidechito hayashi Tetsuya Okumura Hiromitsu Hamakawa Department of Mechanical Engineering Nagasaki University1-14 Bunkyo machiNagasaki852-8521Japan Department of Mechanical Engineering Oita University700 Dannoharu Oita870-1192Japan

The pitch of the spiral finned tube influences seriously to the acoustic resonance in the heat *** this research,the flow characteristics in relating to the aeolian tone from the finned cylinder are studied by the numerical *** is observed that the tonal noise generated from the finned tube at two pitch *** ratio of the fin pitch to the cylinder diameter is changed at 0.11 and *** tone level increases and the frequency decreases with the pitch *** separation flow from the cylinder generates the span-wise vortices,Karman vortices,and the separation flow from the fin generates the stream-wise *** the fin pitch ratio is small,the stream-wise vortices line up to span-wise and become weak *** the Karman vortices are remained and integrate in *** the Karman vortex became *** causes the low frequency and the large aeolian tone.

关键词： Aerodynamic Noise Aeolian Tone Karman Vortex Spiral Finned Tube

Influence of the Karman Vortex Street on the Broadband Noise Generated from a Multiblade Fan

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Journal of Thermal Science 2005年第3期14卷 198-205页

作者： Souichi SASAKI Yoshio KODAMA Hidechito hayashi Makoto HATAKEYAMA Mechanical systems engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki City 852-8521 Japan Doctor of EngineeringMechanical systems engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki City 852-8521 JapanMechanical systems engineering Nagasaki University 1-14 Bunkyo-machi Nagasaki City 852-8521 JapanProducts R&D Laboratory TOTO Ltd. 2-8-1 Honson Chigasaki City 253-8577 Japan

In the prediction theory for the broadband noise generated from a multiblade fan, the vortices in the Karman vortex street was divided into n pieces. The frequency distribution of the noise was estimated so that the Strouhal number could become constant even if the wake is spread by the diffusion. From the results of the measurement of the internal flow of the fan, it was found that the noise was related to the wake characteristics of the specific location in the scroll casing where the relative flow velocity was high. The noise operating in the vicinity of the maximum efficiency point of the fan was distributed over the domain from 500 Hz to 1250 Hz. It was experimentally proved that the influence of the Karman vortex street on the noise in the domains of high and low frequencies did not exist when the distribution of the estimated sound pressure level corresponded to the measured broadband noise.

关键词： aerodynamic acoustic Karman vortex street turbo machinery blade internal flow

Influence of Diffuser on Aerodynamic Noise of a Forward Curved Fan

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Journal of Thermal Science 2013年第5期22卷 433-438页

作者： Soichi SASAKI Kota SUZUKI Yuta Onomichi Hidechito hayashi Division of System Science Graduate School of Engineering Nagasaki University1-14 Bunkyo-machi Nagasaki 852-8521 Japan Department of Advanced Engineering Graduate School of Engineering Nagasaki University1-14 Bunkyo-machi Nagasaki 852-8521 Japan

In order to clarify the influence of a diffuser on the charactersfics of a forward curved fan, the influence of the bare ratio and the outlet angle on the characteristics of the fan were measured through an experiment performed with an actual fan as well as through a numerical simulation, respectively. The mechanism of the discrete fre- quency noise generated by the separated flow of the diffuser was analyzed. The optimized bare ratio was ap- proximately 17%. The flow separated inside of the diffuser generated discrete frequency noise owing to the inter- action between the reversed flow from the diffuser and the impeller rotating at the blade passing frequency. The diffuser outlet angle influenced the pressure ratio more than that by the bare ratio. Furthermore, it was confirmed that restraining the separation in the diffuser effectively decreases the fan noise.

关键词： Pressure Drop Fan Aerodynamic Noise Internal Flow Separation

Expression of bcl-2 gene increases in apoptosis of vascular endothelial cells induced by rattlesnake venom

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Chinese Science Bulletin 2000年第13期45卷 1195-1198页

作者： Araki Satohiko hayashi Hiroshi Sugashima Marine Biological Laboratory School of ScienceNagoya UniversityTobaMie517JapanSugashima Marine Biological LaboratorySchool of ScienceNagoya UniversityTobaMie517Japan

Apoptosis of vascular endothelial cells (VEC) has been induced by deprivation of survival factors (aFGF and serum) and by rattlesnake venom. The expression of bcl-2 gene has been examined by Northern blotting in the two apoptosis inducing systems. Our results show that the expression of bcl-2 has not been detected in normal culture cells and in apoptotic cells induced by deprivation of survival factors. But in apoptotic cells induced by rattlesnake venom (10 μg/mL), the expression of bcl-2 increases, and its mRNA exhibits two bands. The data first suggest that increasing expression and splitting of bcl-2 mRNA may play an important role in apoptosis of VEC induced by rattlesnake venom, and this finding is helpful to understanding the role of bcl-2 in regulation of apoptosis.

关键词： bcl-2 gene rattlesnake venom apoptosis vascular endothelial cells.

Deep reinforcement learning-based critical element identification and demolition planning of frame structures

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Frontiers of Structural and Civil Engineering 2022年第11期16卷 1397-1414页

作者： Shaojun ZHU Makoto OHSAKI Kazuki hayashi Shaohan ZONG Xiaonong GUO College of Civil Engineering Tongji UniversityShanghai 200092China Department of Architecture and Architectural Engineering Kyoto UniversityKyoto 615-8540Japan Tongji Lvjian Co. Ltd.Shanghai 200092China

This paper proposes a framework for critical element identification and demolition planning of frame *** quantitative indices considering the severity of the ultimate collapse scenario are proposed using reinforcement learning and graph *** action is defined as removing an element,and the state is described by integrating the joint and element features into a comprehensive feature vector for each *** establishing the policy network,the agent outputs the Q value for each action after observing the *** numerical examples,it is confirmed that the trained agent can provide an accurate estimation of the Q values,and handle problems with different action spaces owing to utilization of graph ***,different behaviors can be learned by varying hyperparameters in the reward *** comparing the proposed method and the conventional sensitivity index-based methods,it is demonstrated that the computational cost is considerably reduced because the reinforcement learning model is trained ***,it is proved that the Q values produced by the reinforcement learning agent can make up for the deficiencies of existing indices,and can be directly used as the quantitative index for the decision-making for determining the most expected collapse scenario,i.e.,the sequence of element removals.

关键词： progressive collapse alternate load path demolition planning reinforcement learning graph embedding

A case of intrahepatic clear cell cholangiocarcinoma

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World Journal of Gastroenterology 2010年第20期16卷 2571-2576页

作者： Eo Toriyama Atsushi Nanashima Hideyuki hayashi Kuniko Abe Naoe Kinoshita Shunsuke Yuge Takeshi Nagayasu Masataka Uetani Tomayoshi hayashi Department of Pathology Nagasaki University HospitalNagasaki 852-8501Japan Division of Surgical 4Oncology Nagasaki University Graduate School of Biomedical SciencesNagasaki 852-8523Japan Department of Radiological Sciences Nagasaki University Graduate School of Bio-medical SciencesNagasaki 852-8523Japan

Intrahepatic clear cell cholangiocarcinoma is very rareonly 8 cases have been reported.A 56-year-old Japanese man with chronic hepatitis B infection was diagnosed with a 2.2 cm hepatocellular carcinoma on imaging,and hepatic segmentectomy was ***,the tumor cells had copious clear cytoplasm and formed glandular structures or solid *** pathological findings suggested the tumor was a clear cell variant of intrahepatic *** stains and radiological images suggested that the cause of the clear cell change had been glycogen,not mucin nor *** immunohistochemical staining,cytokeratin(CK)7 and CK19 were positive,whereas CK20 was *** was detected on the cell membranes,and CD56 was focally *** patient was given adjuvant chemotherapy and is currently free from the tumor 7 mo *** follow-up with adequate postoperative supplementary chemotherapy is necessary because the characteristics of this type of tumor are unknown.

关键词： Intrahepatic cholangiocarcinoma Clear cell carcinoma Glycogen Mucin Lipid Hepatectomy