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Hadro- and photo-production of η′ in quasi-free proton and neutron processes

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Chinese Physics C 2009年第12期33卷 1291-1295页

作者：黄飞 K. nakayama Department of Physics and Astronomy University of Georgia Athens GA 30602 USA Institut fr Kernphysik and Jlich Center for Hadron Physics Forschungszentrum Jlich D-52425 Jlich Germany

The η′ photoproduction process on quasi-free proton and neutron and the reaction NN→ η′NN are investigated within a relativistic effective Lagrangian approach to hadronic interactions. Resonances with spins 1/2 and 3/2 are considered together with the nucleonic and t-channel meson-exchange current contributions. In photoproduction processes, the S11 resonance is found to be responsible for the sharp rise of the cross sections near threshold. In pp → η′pp, it is found that the S11 resonance dominates the total cross section over the entire energy region considered. The spin observables, in particular the beam and target asymmetries, are shown to be very sensitive to the reaction mechanism and will help impose more stringent constraints on the model parameters.

关键词： η′ production free and quasi-free photoproduction meson production in NN collisions

Heat Transfer with Flow and Phase Change in an Evaporator of Miniature Flat Plate Capillary Pumped Loop

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Journal of Thermal Science 2007年第3期16卷 254-263页

作者： Zhongmin WAN Wei LIU Zhaoqing ZHENG A. nakayama College of Energy and Power Engineering Huazhong University of Science and Technology Wuhan 430074 China Department of Mechanical Engineering Shizuoka University3-5-1 Johoku Hamamatsu 432-8561 Japan

An overall two-dimensional numerical model of the miniature flat plate capillary pumped loop （CPL） evaporator is developed to describe the liquid and vapor flow, heat transfer and phase change in the porous wick structure, liquid flow and heat transfer in the compensation cavity and heat transfer in the vapor grooves and metallic wall. The entire evaporator is solved with SIMPLE algorithm as a conjugate problem. The effect of heat conduction of metallic side wall on the performance of miniature flat plate CPL evaporator is analyzed, and side wall effect heat transfer limit is introduced to estimate the performance of evaporator. The shape and location of vapor-liquid interface inside the wick are calculated and the influences of applied heat flux, liquid subcooling, wick material and metallic wall material on the evaporator performance are investigated in detail. The numerical results obtained are useful for the miniature flat plate evaporator performance optimization and design of CPL.

关键词： capillary pumped loop flat plate evaporator side wall effect heat transfer limit wick structure

Effect of dissolved oxygen on methane production from bottom sediment in a eutrophic stratified lake

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Journal of Environmental Sciences 2023年第3期125卷 61-72页

作者： Yasuyuki Maruya Keisuke nakayama Masafumi Sasaki Katsuaki Komai Graduate School of Engineering Kyushu University744 MotookaNishi-KuFukuoka 819-0395Japan Graduate School of Engineering Kobe UniversityRokkodai-Cho 1-1Nada-KuKobe 657-8501Japan Department of Engineering Kitami Institute of TechnologyKohen-Cho 165Kitami 090-8507Japan

Clarifying the role of sulfate and dissolved oxygen (DO) in methane production may allow for precise and accurate modeling of methane emissions in eutrophic *** conducted field observations of sulfate,methane,and DO concentrations in Lake Abashiri,a typical brackish and eutrophic lake in a cold region,to develop a DO-based method for quantitively estimating methane production in a eutrophic lake and analyzed the *** found that sulfate concentrations decreased rapidly from 900.0 mg/L in water overlying the sediments to nearly 0.0 mg/L in the bottom *** production was almost uniform across sediment depths of 0.05 to 0.25 m,ranging from 1400 to 1800μmol/m^(2)/***,methane production was found to be a function of DO concentrations in water overlying the bottom and could be modeled by a logistic function:constant production at 1,400μmol/m^(2)/day for DO concentrations of 0.0 to 3.0 mg/L,rapidly decreasing to 0μmol/m^(2)/day for DO concentrations of 3.0 to 6.0 mg/*** methane model was verified using a simple one-dimensional numerical model that showed good agreement with field *** results thus suggest that the proposed methane model reduces uncertainty in estimating methane production in a eutrophic lake.

关键词： Dissolved oxygen(DO) Stratification Methane Anoxia Numerical simulation

SUBSTITUENT EFFECTS OF tert-BUTYL GROUPS ON FLUORENYL LIGAND OF [t-BuNSiMe2Flu] ZrMe2

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Chinese Journal of Polymer Science 2008年第5期26卷 575-578页

作者： Yuushou nakayama Takeshi Shiono Department of Applied Chemistry Graduate School of EngineeringHiroshima UniversityHigashi-Hiroshima 739-8527Japan

[t-BuNSiMe_2(2,7-t-Bu_2Flu)]ZrMe_2 and[t-BuNSiMe_2(3,6-t-Bu_2Flu)]ZrMe_2 were synthesized,and the solid structure of complex[t-BuNSiMe_2(2,7-t-Bu_2Flu)]ZrMe_2 was elucidated by single crystal X-ray *** complexes were applied for propylene polymerization using dried modified methylaluminoxane as a cocatalyst at 0℃and 20℃in *** systems did not show activity at 0℃,but they conducted the polymerization at 20℃.The introduction of t-butyl substituents to the fluorenyl ligand improved the activ...

关键词： Single-site catalyst Zirconium complex Propylene Polymerization Syndiospecificity.

Development of perianal ulcer as a result of acute fulminant amoebic colitis

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World Journal of Gastroenterology 2012年第34期18卷 4794-4797页

作者： Takayuki Torigoe Yoshifumi nakayama Koji Yamaguchi Department of Surgery 1 School of MedicineUniversity of Occupational and Environmental HealthKitakyushu 807-8555Japan

We report a case of acute fulminant amoebic colitis that resulted in the development of a perianal ulcer in a 29-year-old Japanese homosexual man with acquired immunodeficiency syndrome (AIDS). The patient was admitted to our hospital with a persistent perianal abscess that was refractory to antibiotic therapy adminis-tered at another hospital. On admission, we observed a giant ulcer in the perianal region. At first, cytomega-lovirus colitis was suspected by blood investigations. Ganciclovir therapy was initiated; however, the patient developed necrosis of the skin around the anus during therapy. We only performed end-sigmoidostomy and necrotomy to avoid excessive surgical invasion. Histopathological examination of the surgical specimen revealed the presence of trophozoite amoebae, indicating a final diagnosis of acute fulminant amoebic colitis. The patient's postoperative course was favorable, and proctectomy of the residual rectum was performed 11 mo later. Amoebic colitis is one of the most severe complications affecting patients with AIDS. Particularly, acute fulminant amoebic colitis may result in a poor prognosis; therefore, staged surgical therapy as a lessinvasive procedure should be considered as one of the treatment options for these patients.

关键词： Acute fulminant amoebic colitis Perianal ul-cer Acquired immunodeficiency syndrome Cytomega-Iovirus colitis Staged surgery

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Asian gut microbiome

Science Bulletin 2017年第12期62卷 816-817页

作者： Jiro nakayama Heping Zhang Yuan-Kun Lee Department of Bioscience and Biotechnology Faculty of AgricultureKyushu University Key Laboratory of Dairy Biotechnology and Engineering Education Ministry of P.R.ChinaDepartment of Food Science and EngineeringInner Mongolia Agricultural University Department of Microbiology & Immunology National University of Singapore

Several hundred microbial species inhabit the human gastrointestinal(GI)tract and constitute a complex ecological community that influences the host’s physiology and immunity through their metabolism and interactions with the host[1,2].The composition of the GI microbiota varies among *** intrinsic and extrinsic factors,including host genetics and physiology,drug and disease,and diets and some other living environments。

关键词：胃肠道微生物亚洲胃肠道菌群饮食习惯生物物种生态群落相互作用新陈代谢

Excision of a large abdominal wall lipoma improved bowel passage in a Proteus syndrome patient

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World Journal of Gastroenterology 2009年第26期15卷 3312-3314页

作者： Yoshifumi nakayama Shinichi Kusuda Naoki Nagata Koji Yamaguchi Department of Surgery 1 School of MedicineUniversity of Occupational and Environmental Health Department of Surgery Moji Medical Center Department of Surgery Kitakyushu General Hospital

Proteus syndrome is an extremely rare congenital disorder that produces multifocal overgrowth of tissue. This report presents a surgical case of a large lipoma in the abdominal wall of a patient with Proteus syndrome. She was diagnosed with Proteus syndrome based on certain diagnostic criteria. The neoplasm increased in size gradually, producing hemihypertrophy of her left lower extremity and trunk, and spread to her retroperitoneum and her left abdominal wall. She experienced gradually progressive constipation, nausea, vomiting, and abdominal pain. Computed tomography （CT） of the abdomen demonstrated a large mass in the subcutaneous adipose tissue of the left lower abdominal wall which measured 12 cm×8 cm×6 cm in diameter and encased the left colon. This mass in the abdominal wall was excised. The weight of the excised mass was 1550 g. The histopathological diagnosis of this mass was lipoma. After surgery, the encasement of the left colon was improved, and the patient was able to move her bowels twice per day. The excision of the large lipoma in the abdominal wall contributed to the improved bowel passage in this patient with Proteus syndrome.

关键词： Proteus syndrome Lipoma Bowel obstruction Abdominal wall Bowel passage

Role of surgical resection for hepatocellular carcinoma based on Japanese clinical guidelines for hepatocellular carcinoma

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World Journal of Hepatology 2015年第2期7卷 261-269页

作者： Hisashi nakayama Tadatoshi Takayama Department of Digestive Surgery Nihon University School of Medicine

In the Algorithm for Diagnosis and Treatment in the Japanese Evidence-Based Clinical Practice Guidelines for Hepatocellular Carcinoma, the treatment strategy is determined by three major factors: liver function and the number and size of tumors. The algorithm is quite simple, consisting of fewer components than the Barcelona-Clinic Liver Cancer staging system. In this article, we describe the roles of the treatment algorithmin hepatectomy and perioperative management of hepatocellular carcinoma.

关键词： Hepatocellular carcinoma Guideline Liverresection Treatment algorithm

Management before hepatectomy for hepatocellular carcinoma with cirrhosis

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World Journal of Hepatology 2015年第20期7卷 2292-2302页

作者： Hisashi nakayama Tadatoshi Takayama Department of Digestive Surgery Nihon University School of Medicine

The global distribution of hepatocellular carcinoma(HCC) varies markedly among regions, and patients in East Asia and Central Africa account for about 80% of all cases. The risk factors are hepatitis B, hepatitis C, alcohol, and etc. The risk of carcinogenesis further increases with progression to hepatic cirrhosis in all liver disorders. Radical treatment of HCC by liver resection without causing liver failure has been established as a safe approach through selection of an appropriate range of resection of the damaged liver. This background indicates that both evaluation of hepatic functional reserve and measures against concomitant diseases such as thrombocytopenia accompanying portal hypertension, prevention of rupture of esophageal varices, reliable control of ascites, and improvement of hypoalbuminemia are important issues in liver resection in patients with hepatic cirrhosis. We review the latest information on perioperative management of liver resection in HCC patients with hepatic cirrhosis.

关键词： Hepatocellular carcinoma Liver resection Liver cir