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Noise Reduction and Surge Margin Improvement Using Tapered Diffuser Vane in a Centrifugal Compressor

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Journal of Thermal Science 2010年第1期19卷 21-25页

作者： Takashi Goto eri Ohmoto Yutaka Ohta Eisuke Outa Department of Applied Mechanics and Aerospace Engineering Waseda University Graduate Student Graduate School of Applied Mechanical EngineeringWaseda University

Improvement of surge margin and reduction of interaction tone noise radiated from a centrifugal compressor with a vaned diffuser is discussed from experiments and CFD *** types of one-side tapered diffuser vanes,which are shroud-and hub-side tapered vanes,were used in the *** height of the leading edge of the tapered vanes varied from 100% to 10%.Both types of tapered vanes are effective for the reduction of the interaction tone noise radiated from the compressor,because of the smaller interaction area between impeller-discharge flow and diffuser vane ***,the hub-side tapered diffuser vane suppresses the evolution of the leading-edge vortex,which causes reverse-flow in the diffuser ***,the hub-side tapered diffuser vane,which has an optimized diffuser leading edge shape,can improve the compressor pressure-rise characteristics at low-flow operation and can enlarge the surge margin.

关键词： Centrifugal compressor tapered diffuser vane interaction tone noise CFD

Acute development of collateral circulation and therapeutic prospects in ischemic stroke

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Neural Regeneration Research 2016年第3期11卷 368-371页

作者： eri Iwasawa Masahiko Ichijo Satoru Ishibashi Takanori Yokota Department of Neurology and Neurological Science Tokyo Medical and Dental University

In acute ischemic stroke,collateral circulation plays an important role in maintaining blood flow to the tissue that is at risk of progressing into ischemia,and in increasing the successful recanalization rate without hemorrhagic *** have reported that well-developed collateral circulation is associated with smaller infarct volume and better long-term neurological outcome,and it disappears promptly once the effective recanalization is *** to the belief that collateral vessels develop over time in chronic stenotic condition,there exists a phenomenon that collateral circulation develops immediately in acute stenosis or occlusion of the arteries and it seems to be triggered by fluid shear stress,which occurs between the territories of stenotic/occluded arteries and those fed by surrounding intact *** believe that this acute development of collateral circulation is a target of novel therapeutics in ischemic stroke and refer our recent attempt in enhancing collateral circulation by modulating sphingosine-1-phosphate receptor 1,which is a known shear-stress mechanosensing protein.

关键词： ischemic stroke collateral S1PR1 shear stress leptomeningeal arteries PCA laterality hyperintensive vessels

Understanding the multifaceted etiopathogenesis of foot complications in individuals with diabetes

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World Journal of Clinical Cases 2023年第8期11卷 1669-1683页

作者： Tatjana Matijević Jasminka Talapko Tomislav Meštrović Marijan Matijević Suzana erić Ivan erić IvanaŠkrlec Department of Dermatology and Venereology University Hospital Center OsijekOsijek 31000Croatia Faculty of Dental Medicine and Health Josip Juraj Strossmayer University of OsijekOsijek 31000Croatia University Centre Varaždin University NorthVaraždin 42000Croatia Institute for Health Metrics and Evaluation and the Department for Health Metrics Sciences University of Washington School of MedicineSeattleWA 98195United States Department of Surgery National Memorial Hospital VukovarVukovar 32000Croatia Faculty of Medicine Josip Juraj Strossmayer University of OsijekOsijek 31000Croatia Department of Radiotherapy and Oncology Clinical Hospital Center OsijekOsijek 31000Croatia Department of Surgery Osijek University Hospital CentreOsijek 31000Croatia

Diabetes mellitus,a chronic disease of metabolism,is characterized by a disordered production or cellular utilization of *** foot disease,which comprises the spectrum of infection,ulceration,and gangrene,is one of the most severe complications of diabetes and is the most common cause of hospitalization in diabetic *** aim of this study is to provide an evidence-based overview of diabetic foot *** to neuropathy,diabetic foot infections can occur in the form of ulcers and minor skin *** patients with diabetic foot ulcers,ischemia and infection are the main causes of non-healing ulcers and *** compromises the immune system of individuals with diabetes,leading to persistent inflammation and delayed wound *** addition,the treatment of diabetic foot infections is challenging due to difficulty in accurate identification of pathogenic microorganisms and the widespread issue of antimicrobial *** a further complicating factor,the warning signs and symptoms of diabetic foot problems can easily be *** associated with diabetic foot complications include peripheral arterial disease and osteomyelitis;accordingly,the risk of these complications in people with diabetes should be assessed *** antimicrobial agents represent the mainstay of treatment for diabetic foot infections,if peripheral arterial disease is present,revascularization should be considered to prevent limb amputation.A multidisciplinary approach to the prevention,diagnosis,and treatment of diabetic patients,including those with foot ulcers,is of the utmost importance to reduce the cost of treatment and avoid major adverse consequences such as amputation.

关键词： Diabetic foot Diabetes mellitus Foot ulcer Infection Peripheral arterial disease

Clothing skirt designed on conical truss model

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Advances in Manufacturing 2013年第2期1卷 130-135页

作者： eri Nakayama Sachiko Ishida Yu-Jing Liao Ichiro Hagiwara Organization for the Strategic Coordination of Research and Intellectual Property Meiji University8114-21-1NakanoNakano-kuTokyo 164-8525Japan

Several applications of Origami have been tested in industrial area. However, Origami based design is found only in lamp shade and wrapping in design area, and has not been practically applied especially in clothing. In this paper, the conical truss model is applied in the clothing skirt, and the simulation software from 2D to 3D is developed by parametric Origami module （POM）. Finally, the pattern is copied on felt clothing, and the scaled model of skirt on the basis of conical reverse truss model design is made.

关键词： Origami Conical truss model ParametricOrigami module (POM)

A novel polymer critical re-melting treatment for improving corrosion resistance of magnesium alloy stent

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Journal of Materials Science & Technology 2019年第1期35卷 19-22页

作者： Shanshan Chen Peng Wan Bingchun Zhang Deniz Eren eri?en Hui Yang Ke Yang Institute of Metal Research Chinese Academy of Sciences School of Mechanical Engineering Dongguan University of Technology University of Science and Technology of China

Polymer coating was widely used as a protective coating on Mg alloy stent due to its excellent deformability. However, the polymer coating with lots of macro-and micro-holes after solvent evaporation during forming process would make corrosion medium permeate easier and decrease the corrosion resistance of Mg alloy stent. In this study, a novel critical re-melting method was adopted to improve the polymer coating densification, which was evaluated by the surface morphology of coating. The corrosion resistance of Mg alloy stent after critical re-melting treatment was examined by the electrochemical and immersion tests. The results indicated that the corrosion resistance of Mg alloy stent with polymer coating was improved significantly by polymer critical re-melting treatment.

关键词： Mg alloy stent Polymer coating Critical re-melting treatment Corrosion resistance

Low-grade myofibroblastic sarcoma of the palate

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International Journal of Oral Science 2012年第3期4卷 170-173页

作者： Tomohiro Yamada Tomohide Yoshimura Naoya Kitamura eri Sasabe Seiji Ohno Tetsuya Yamamoto Department of Oral and Maxillofacial Surgery Kochi Medical SchoolKochi University

Low-grade myofibroblastic sarcoma （LGMS） is a rare, malignant tumor with myofibroblastic differentiation. Despite it being classified as a distinct entity by the World Health Organization, a few cases were reported in the oral and maxillofacial region. Here, a LGMS developed on the palate of a 73-year-old man who presented with a 1-cm tumor on the posterior border of the palate. Based on the histological and immunohistochemical features, a diagnosis of LGMS was established. The tumor was resected, and no recurrence was observed over 2 years. Although the tongue is the most preferred site for LGMS, it may occur in any region of the oral cavity.

关键词： low-grade myofibroblastic sarcoma oral palate

Mechanisms of Cup-Shaped Vesicle Formation Using Amphiphilic Diblock Copolymer

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Open Journal of Polymer Chemistry 2022年第2期12卷 43-54页

作者： eri Yoshida Department of Applied Chemistry and Life Science Toyohashi University of Technology Toyohashi Japan

A cup shape is a dynamic morphology of cells and organelles. With the aim of elucidating the formation of the biotic cup-shaped morphology, this study investigated cup-shaped vesicles consisting of an amphiphilic diblock copolymer from the aspect of synthetic polymer chemistry. Cup-shaped vesicles were obtained by the polymerization-induced self-assembly of poly(methacrylic acid)-block-poly(n-butyl methacrylate-random-methacrylic acid), PMAA-b-P(BMA-r-MAA), in an aqueous methanol solution using the photo nitroxide-mediated controlled/living radical polymerization technique. Field emission scanning electron microscopic observations demonstrated that the cup-shaped vesicles were suddenly formed during the late stage of the polymerization due to the extension of the hydrophobic P(BMA-r-MAA) block chain. During the early stage, the polymerization produced spherical vesicles rather than a cup shape. As the hydrophobic block chain was extended by the polymerization progress, the spherical vesicles reduced the size and were accompanied by the generation of small particles that were attached to the vesicles. The vesicles continued to reduce the size due to further extension of the hydrophobic chain;however, they suddenly grew into cup-shaped vesicles. This growth was accounted for by a change in the critical packing shape of the copolymer due to the hydrophobic chain extension. These findings are helpful for a better understanding of the biotic cup-shaped vesicle formation.

关键词： Cup-Shaped Vesicles Polymerization-Induced Self-Assembly Poly(methacrylic acid)-block-poly(n-butyl methacrylate-random-methacrylic acid) Critical Packing Shape

A Novel Method for Automated Lung Region Segmentation in Chest X-Ray Images

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Journal of Biomedical Science and Engineering 2021年第6期14卷 288-299页

作者： eri Matsuyama Faculty of Informatics The University of Fukuchiyama Kyoto Japan

Detecting and segmenting the lung regions in chest X-ray images is an important part in artificial intelligence-based computer-aided diagnosis/detection (AI-CAD) systems for chest radiography. However, if the chest X-ray images themselves are used as training data for the AI-CAD system, the system might learn the irrelevant image-based information resulting in the decrease of system’s performance. In this study, we propose a lung region segmentation method that can automatically remove the shoulder and scapula regions, mediastinum, and diaphragm regions in advance from various chest X-ray images to be used as learning data. The proposed method consists of three main steps. First, employ the simple linear iterative clustering algorithm, the lazy snapping technique and local entropy filter to generate an entropy map. Second, apply morphological operations to the entropy map to obtain a lung mask. Third, perform automated segmentation of the lung field using the obtained mask. A total of 30 images were used for the experiments. In order to verify the effectiveness of the proposed method, two other texture maps, namely, the maps created from the standard deviation filtering and the range filtering, were used for comparison. As a result, the proposed method using the entropy map was able to appropriately remove the unnecessary regions. In addition, this method was able to remove the markers present in the image, but the other two methods could not. The experimental results have revealed that our proposed method is a highly generalizable and useful algorithm. We believe that this method might act an important role to enhance the performance of AI-CAD systems for chest X-ray images.

关键词： Chest X-Ray Image Segmentation Thresholding Simple Linear Iterative Clustering Lazy Snapping Entropy Filtering Masking AI-CAD

Characterization of Organic Aerosol at a Rural Site in the North China Plain Region:Sources,Volatility and Organonitrates

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Advances in Atmospheric Sciences 2021年第7期38卷 1115-1127页

作者： Qiao ZHU Li-Ming CAO Meng-Xue TANG Xiao-Feng HUANG eri SAIKAWA Ling-Yan HE Key Laboratory for Urban Habitat Environmental Science and Technology Peking University Shenzhen Graduate SchoolShenzhen 518055China Department of Environmental Sciences Emory UniversityAtlantaGA 30322USA Rollins School of Public Health Emory UniversityAtlantaGA 30322USA

The North China Plain(NCP)is a region that experiences serious aerosol pollution.A number of studies have focused on aerosol pollution in urban areas in the NCP region;however,research on characterizing aerosols in rural NCP areas is comparatively *** this study,we deployed a TD-HR-AMS(thermodenuder high-resolution aerosol mass spectrometer)system at a rural site in the NCP region in summer 2013 to characterize the chemical compositions and volatility of submicron aerosols(PM_(1)).The average PM_(1)mass concentration was 51.2±48.0μg m^(−3) and organic aerosol(OA)contributed most(35.4%)to PM_(1).Positive matrix factorization(PMF)analysis of OA measurements identified four OA factors,including hydrocarbon-like OA(HOA,accounting for 18.4%),biomass burning OA(BBOA,29.4%),lessoxidized oxygenated OA(LO-OOA,30.8%)and more-oxidized oxygenated OA(MO-OOA,21.4%).The volatility sequence of the OA factors was HOA>BBOA>LO-OOA>MO-OOA,consistent with their oxygen-to-carbon(O:C)***,the mean concentration of organonitrates(ON)was 1.48−3.39μg m−3,contributing 8.1%-19%of OA based on cross validation of two estimation methods with the high-resolution time-of-flight aerosol mass spectrometer(HRToF-AMS)*** analysis shows that ON were more correlated with BBOA and black carbon emitted from biomass burning but poorly correlated with ***,volatility analysis for ON further confirmed that particulate ON formation might be closely associated with primary emissions in rural NCP areas.

关键词： organic aerosols volatility organonitrates biomass burning North China Plain