检索结果-南通市图书馆

Flow fields control for bubble refinement induced by electromagnetic fields

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2022年第4期29卷 575-587页

作者： Lian-yu Wang Ze-yi Liu Ming He Xiao-ming Liu masamichi Sano Li-jia Zhao Qiang Wang Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern UniversityShenyang 110819LiaoningChina School of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina

Large bubbles seriously reduce the efficiencies of the interactions between the bubbles and the molten steel,such as energy transfer,momentum transfer,mass transfer and chemical *** reduce the size of the bubbles and increase the gas–liquid interface area,a novel non-intrusive method of bubble refinement was proposed,which only depends on the molten steel flow field controlled by the rotating electromagnetic *** flow fields of the molten steel for bubble refinement were analyzed,and the corresponding bubble refinement was *** was found that the molten steel formed obvious rotating turbulent flow for bubble refinement under the unidirectional rotating electromagnetic ***,the large vortex in the center of the molten pool caused by the rotating flow made the bubbles aggregate and coalesce again,resulting in formation of larger bubbles and gas *** suppress the central vortex formation and enhance the bubble refinement,the forward-reverse rotating electromagnetic field for bubble refinement was *** irregular and chaotic flow occurred repeatedly because of alternating forward and reverse rotating in a short period,so that the turbulent kinetic energy and turbulent dissipation of the flow field always remained at a high level which favors bubble *** a result,the bubble diameter can decrease by more than 50%compared to that without electromagnetic ***,it is important that this non-intrusive kind of bubble refinement method completely avoids the introduction of non-metallic inclusions caused by intrusive configuration.

关键词： Bubble refinement Electromagnetic field Flow field Forward-reverse rotating Bubble Sauter

Cold Model Study on Mg Desulfurization of Hot Metal Under Mechanical Stirring

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2013年第12期20卷 1-6页

作者： LIU Yan ZHANG Zi-mu LIU Jian-nan ZHANG Jun-hua masamichi Sano ZHANG Jun Key Laboratory of Ecological Utilization of Multi-metal Intergrown Ores of Ministry of Education School of Materials and MetallurgyNortheastern University Beijing Institute of Technology Dalian University of Technology Nagoya University

The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble＇s dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers.

关键词： gas injection refining eccentric mechanical stirring bubble disintegration bubble dispersion volumetric mass transfer coefficient Mg desulfurization hot metal

Right hepatectomy for giant cavernous hemangioma with diffuse hemangiomatosis around Glisson's capsule

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第25期20卷 8312-8316页

作者： Yu Ohkura Masaji Hashimoto Seigi Lee Kazunari Sasaki masamichi Matsuda Goro Watanabe Department of Digestive Surgery Hepato Pancreato Billiary Surgery UnitToranomon HospitalTokyo 105-8470Japan

Diffuse liver hemangiomatosis with giant cavernous hemangioma in adult is extremely rare. A 35 year-old woman presented to hospital with main complaint of epigastric pain and abdominal fullness. An enhanced computed tomography scan revealed a massive liver tumor in right lobe about 150 mm in size. There was contrast enhancement at the periphery of the mass consistent with a cavernous hemangioma. She underwent right hepatectomy. Histologically, it was diagnosed as a cavernous hemangioma. And also, hemangiomatous lesions were scattered around the Glisson’s capsule on the back ground liver. These hemangiomatous lesions were not recognized preoperatively. Even if we couldn’t diagnose hemangiomatosis around the main giant hemangioma preoperatively, we need to take enough surgical margins because the giant hemangioma has the potential to have small hemangiomatous lesions around the tumor. We reported right hepatectomy for giant cavernous hemangioma with diffuse hepatic hemangiomatosis without an extrahepatic lesion in an adult.

关键词： Giant cavernous hemangioma Hemangiomatosis Right hepatectomy Around Glisson’ s capsule Surgery

Retroperitoneal cavernous hemangioma resected by a pylorus preserving pancreaticoduodenectomy

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第28期19卷 4624-4629页

作者： Marie Hanaoka Masaji Hashimoto Kazunari Sasaki masamichi Matsuda Takeshi Fujii Kenichi Ohashi Goro Watanabe Department of Digestive Surgery Toranomon Hospital Tokyo 105-8470 Japan Department of Pathology Toranomon Hospital Tokyo 105-8470 Japan Department of Pathology Yokohama City University Graduate School of Medicine Kanagawa 236-0004 Japan

A retroperitoneal hemangioma is a rare disease. We report on the diagnosis and treatment of a retroperitoneal hemangioma which had uncommonly invaded into both the pancreas and duodenum, thus requiring a pylorus preserving pancreaticoduodenectomy (PpPD). A 36-year-old man presented to our hospital with abdominal pain. An enhanced computed tomography scan without contrast enhancement revealed a 12 cm × 9 cm mass between the pancreas head and right kidney. Given the high rate of malignancy associated with retroperitoneal tumors, surgical resection was performed. Intraoperatively, the tumor was inseparable from both the duodenum and pancreas and PpPD was performed due to the invasive behavior. Although malignancy was suspected, pathological diagnosis identified the tumor as a retroperitoneal cavernous hemangioma for which surgical resection was the proper diagnostic and therapeutic procedure. Reteoperitoneal cavernous hemangioma is unique in that it is typically separated from the surrounding organs. However, clinicians need to be aware of the possibility of a case, such as this, which has invaded into the surrounding organs despite its benign etiology. From this case, we recommend that combined resection of inseparable organs should be performed if the mass has invaded into other tissues due to the hazardous nature of local recurrence. In summary, this report is the first to describe a case of retroperitoneal hemangioma that had uniquely invaded into surrounding organs and was treated with PpPD.

关键词： Retroperitoneal tumor Retroperitoneal cavernous hemangioma Cavernous hemangioma Pancreaticoduodenectomy Pylorus preserving pancreaticoduodenectomy

Practical Study of the Sports Garbage Pickup Tournament in Japan-Sports Events to Solve Social Problems

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sports Science 2019年第2期7卷 56-64页

作者： masamichi Aihara Faculty of Human Sciences Osaka University of Economics2-2-8 OsumiHigashiyodogawa-kuOsaka 533-8533Japan

The Sports Garbage Pickup Tournament is a sports event that incorporates elements of competition into cleaning activities,as opposed to traditional cleaning *** of the end of December 2016,a total of 552 Sports Garbage Pickup Tournaments have been held,mobilizing a cumulative total number of 62,989 *** each tournament brings a revenue of over 300,000 yen,the total sales so far would be more than 165,000,000 *** game was recently reported on the International Olympic Committee *** garbage issue,a social problem for local communities,should be solved by residents,visitors,and workers themselves through sports,cooperating with local *** is an eco-friendly sport aimed at“solving local social problems through sports.”Sports Garbage Pickup Tournaments can be held anywhere,inside the city or in a natural *** addition,the competition allows participants to visually understand the environmental capacity of garbage produced in the community,as the points are weighted according to the types of *** Sports Garbage Pickup Tournament is an educational program for sustainable development with emphasis on experience,pursuit,and practice,and also an action-based program aimed at promoting spontaneous *** is an optimal competition for participants to acquire skills through mutual *** children,adults,and people with disabilities can play together,the competition will promote communication across the generations.

关键词： Sports garbage pickup tournament sports event sports innovation environment social problem

Prospective validation to prevent symptomatic portal vein thrombosis after liver resection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2022年第5期14卷 1016-1024页

作者： Nao Yoshida Shintaro Yamazaki Moriguchi masamichi Yukiyasu Okamura Tadatoshi Takayama Department of Digestive Surgery Nihon University School of MedicineTokyo 1738610Japan

BACKGROUND Portal vein thrombosis(PVT)after liver resection is rare but can lead to lifethreatening liver *** prospective study evaluated patients using contrastenhanced computed tomography(E-CT)on the first day after liver resection for early PVT detection and *** To evaluate patients by E-CT on the first day after liver resection for early PVT detection and immediate *** Patients who underwent liver resection for primary liver cancer from January 2015 were enrolled.E-CT was performed on the first day after surgery in patients undergoing anatomical resection,multiple resections,or with postoperative bile leakage in the high-risk group for *** PVT was detected,anticoagulant therapy including heparin,warfarin,and edoxaban was administered.E-CT was performed monthly until PVT *** The overall incidence of PVT was 1.57%(8/508).E-CT was performed on the first day after surgery in 235 consecutive high-risk patients(165 anatomical resections,74 multiple resections,and 28 bile leakages),with a PVT incidence of 3.4%(8/235).Symptomatic PVT was not observed in the excluded *** analyses revealed that sectionectomy was the only independent predictor of PVT[odds ratio(OR)=12.20;95%confidence interval(CI):2.22-115.97;P=0.003].PVT was found in the umbilical portion of 75.0%(6/8)of patients,and sectionectomy on the left side showed the highest risk of PVT(OR=14.10;95%CI:3.17-62.71;P<0.0001).CONCLUSION Sectionectomy on the left side should be chosen with caution as it showed the highest risk of PVT.E-CT followed by anticoagulant therapy was effective in managing early-phase PVT for 2 mo without adverse events.

关键词： Portal vein thrombosis Liver resection Anatomical resection Anticoagulant therapy Hepatocellular carcinoma Umbilical potion

A Study of Sports Hospitality at the Rugby World Cup 2019 for a Tourism Experience Product: A Consideration from the Viewpoint of Eliminating Overtourism in Spectator Sports

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Sports Science 2020年第2期8卷 33-40页

作者： masamichi Aihara Faculty of Human Sciences Osaka University of Economics2-2-8 OsumiHigashiyodogawa-kuOsaka 533-8533Japan

In this research project,we focus on sports hospitality at the Rugby World Cup 2019 as a practical example of the qualitative pursuit of sports tourism in the Japanese tourism *** Japan K.K.,Japan’s first company specializing in sports hospitality,hosted the first mega sports event held in Japan.A similar spectator service will next be implemented at the Tokyo Olympics and *** hospitality is a new way to enjoy watching sports by adding a meal and entertainment before and after the match to the event *** and using sports hospitality as a tourism experience product,we can use qualitatively designed creative and effective methods that professional human resources could provide to *** research project provides an overview of tourism experience products,looks at their economic effects at the Rugby World Cup 2019,and the sales results of the sports hospitality at the event.I conducted an observation survey at the Rugby World Cup 2019 Scotland *** match held at Misaki Park Stadium(Kobe,Hyogo)on September 30,2019 focusing only on tourism products in that framework.I also conducted a qualitative survey on March 18,2020 in a semi-structured interview format with STH Japan *** *** research results revealed the possibility of eliminating overtourism in spectator sports and the lack of sports hospitality spaces in ***,when watching a sports match where many spectators gather,the uniform start and end times cause crowding and *** conventional challenge has been to create tourism products that reduce congestion and provide an enjoyable tourism *** hospitality is effective for relieving the stress caused by overtourism in spectator *** order to solve the shortage of sports hospitality spaces,one issue to consider is the deregulation by the government.

关键词： Sports tourism sports hospitality overtourism Rugby World Cup 2019 tourism product

Measurements of Laser Induced Bubble Behavior in Elastic Tube and Temperature around Bubble in TUL Treatment

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Flow Control, Measurement & Visualization 2020年第3期8卷 134-145页

作者： Yasuhiro Sugimoto masamichi Hamamoto Department of Mechanical Engineering Kanazawa Institute of Technology Ishikawa Japan

Transurethral ureteral lithotripsy (TUL) is a treatment that breaks stones by irradiating a pulsed laser through an optical fiber. Heat and impulsive force of the laser may affect nearby tissues during treatment. A bubble induced by the pulsed laser plays an important role in laser lithotripsy. It is important to understand effects of the bubble on the surroundings by simulating treatment in a narrow space such as in a ureter. In this study, we observe behaviors of the bubble in the narrow space inside a soft material simulating under in vivo condition. The bubble formed under various laser irradiation conditions exhibits characteristic behavior, and the surrounding elastic wall is compressed and bulged when the bubble grows and collapses. In the case of bubble formed near the elastic wall, the bubble contacts with the elastic wall during growth, and severe large deformation of the elastic wall is observed at bubble collapse. According to the temperature measurement, a temperature rise of 25℃ - 30℃ occurs in the area where the bubbles are in contact. From the above, by presenting the deformation of the elastic wall and temperature increase, we can show useful information to improve the safety for treatment at narrow space.

关键词： Ho:YAG Laser Laser Induced Bubble Lithotripsy Bubble Behavior in Elastic Tube Temperature around Bubble

Eosinophilic enteritis requiring differentiation from chronic enteropathy associated with SLCO2A1 gene:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2023年第11期29卷 1757-1764页

作者： Kantaro Kimura Keisuke Jimbo Nobuyasu Arai masamichi Sato Mitsuyoshi Suzuki Takahiro Kudo Tomonori Yano Toshiaki Shimizu Department of Pediatrics Juntendo University Faculty of MedicineTokyo 113-8421Japan Department of Medicine Jichi Medical UniversityTochigi 329-0498Japan

BACKGROUND Eosinophilic gastrointestinal disease(EGID)is a disorder characterized by infiltration of eosinophils causing mucosal damage and dysfunction of the gastrointestinal *** endoscopic findings of eosinophilic enteritis(EoN),an EGID variant,are nonspecific and occasionally difficult to *** contrast,chronic enteropathy associated with SLCO2A1(CEAS)is a chronic persistent small intestinal disorder characterized by endoscopic findings such as multiple oblique and circular *** SUMMARY We report the case of a 10-year-old boy who had suffered abdominal pain and fatigue for the preceding 6 *** was referred to our institute for investigation of suspected gastrointestinal bleeding because of severe anemia with hypoproteinemia and positive fecal human *** upper and lower gastrointestinal endoscopic findings were normal;however,double-balloon small bowel endoscopy showed multiple oblique and circular ulcers with discrete margins and mild constriction of the intestinal lumen in the *** findings were highly consistent with CEAS,but urine prostaglandin metabolites were within normal limits,and no previously reported mutations in the SLCO2A1 gene were *** evaluation demonstrated moderate to severe eosinophilic infiltration localized to the small intestine suggesting a diagnosis of *** remission was maintained with montelukast and a partial elemental diet,but emergent surgery for bowel obstruction due to small intestinal stenosis was performed two years after the initial *** EoN should be considered in the differential diagnosis of CEAS-like small intestinal ulcerative lesions and normal urinary prostaglandin metabolite levels.

关键词： Anemia Chronic enteropathy associated with SLCO2A1 Double-balloon endoscopy Eosinophilic gastrointestinal disease Hypoproteinemia Case report