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Extension and Comparative Study of AUSM-Family Schemes for Compressible Multiphase Flow Simulations

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Communications in Computational Physics 2014年第8期16卷 632-674页

作者： Keiichi kitamura Meng-Sing Liou Chih-Hao Chang NASA Glenn Research Center ClevelandOH 44135USA. Research Fellow of Japan Society for the Promotion of Science(JSPS) JAXA’s Engineering Digital Innovation(JEDI)Center3-1-1 YoshinodaiChuoSagamiharaJapan Previously at Nagoya University Furo-choChikusa-kuNagoyaAichi 464-8603 Japan Currently at Yokohama National University 79-5 TokiwadaiHodogaya-kuYokohama 240-8501Japan. Theofanous&Co Inc.Santa Barbara CA 93109USA

Several recently developed AUSM-family numerical flux functions(SLAU,SLAU2,AUSM+-up2,and AUSMPW+)have been successfully extended to compute compressible multiphase flows,based on the stratified flow model concept,by following two previous works:one by M.-***,C.-***,***,and ***[AIAA J.46:2345-2356,2008],in which AUSM+-up was used entirely,and the other by C.-***,and M.-***[***.225:840-873,2007],in which the exact Riemann solver was combined into AUSM+-up at the phase *** an extensive survey by comparing flux functions,the following are found:(1)AUSM+-up with dissipation parameters of Kp and Ku equal to 0.5 or greater,AUSMPW+,SLAU2,AUSM+-up2,and SLAU can be used to solve benchmark problems,including a shock/water-droplet interaction;(2)SLAU shows oscillatory behaviors[though not as catastrophic as those of AUSM+(a special case of AUSM+-up with Kp=Ku=0)]due to insufficient dissipation arising from its ideal-gas-based dissipation term;and(3)when combined with the exact Riemann solver,AUSM+-up(Kp=Ku=1),SLAU2,and AUSMPW+are applicable to more challenging problems with high pressure ratios.

关键词： Multiphase flow two-fluid model AUSM-family stratified flow model

Prevaccination Antibody Confers Additional Immune Responses to Repeated Yearly Influenza Vaccination in an Elderly Population

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World Journal of Vaccines 2022年第2期12卷 11-19页

作者： Satoko kitamura Naoki Komatsu Masahide Matsushita Hiromi Seo Seisho Takeuchi Department of General Medicine Kochi Medical School Hospital Nankoku Japan Kochi General Rehabilitation Hospital Kochi Japan

Annual vaccination is necessary to maintain humoral immunity in the elderly population. However, the factors influencing the response to influenza vaccination have not been completely identified. The aim of this study was to explore the factors that influenced antibody responses to repeated vaccination using measures that were both objective and quantitative. A total of 111 volunteers aged > 61 years were vaccinated subcutaneously with one dose of influenza vaccine from the 2005-2006 season through the 2009-2010 season. The factors that influenced antibody responses after vaccination were evaluated. The seroprotection rates (PRs) were significantly higher in responders (subjects with a higher antibody titer in the 2005-2006 season) than in nonresponders only in the 2006-2007 and 2007-2008 seasons. PRs after vaccination were significantly higher in seropositive individuals (subjects with a higher prevaccination antibody titer in the 2006-2007 season) than in seronegative individuals for all three virus strains in almost all of the 5 years. Age, gender, and vaccination in the 2004-2005 season did not influence the response. These results suggest that an immune response at a certain time point would predict immune responses only in the near future. However, prevaccination antibody titer in the following season is the ideal predictor for future responses that last over several influenza seasons.

关键词： Influenza Vaccine Elderly Persons Repeated Vaccination Seroprotection Rate

Endotracheal Tube Displacement during Cardiac Surgery in Infants: A Retrospective Cohort Study of Its Incidence and Predictors

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Open Journal of Anesthesiology 2022年第7期12卷 219-228页

作者： Atsuhiro Sekiguchi Akira kitamura Miki Tsujita Yuki Shiko Hideyuki Nakagawa Department of Anesthesiology Saitama International Medical Center Saitama Medical University Saitama Japan Research Administration Center Saitama Medical University Biostatics Section Clinical Research Center Chiba University Hospital Chiba Japan

Introduction: With the traction on the trachea and intrathoracic manipulation during cardiac surgery, the position of the endotracheal tube (ETT) might be changed as compared to before surgery. Migration of the ETT during pediatric cardiac surgery is particularly problematic in infants. Methods: In this retrospective cohort study, chest X-rays were taken in the operating room just before and after surgery. The position of the ETT among all infants under 1 year of age who underwent cardiac surgery between December 2017 to December 2019 was evaluated. The displacement of the ETT position was examined by measuring the position of the tube tip from the tracheal bifurcation on a chest X-ray, and the relationship between surgery-related factors (age, height, weight, sex, surgery time, cardiopulmonary bypass, tube size, use of tube cuff) was analyzed. Results: Eighty-eight of the 141 patients were enrolled. There was a significant proximal displacement of the ETT tip during cardiac surgery. The distance from the carina to the tube tip after surgery was long, on average 2.5 mm, compared to that before surgery (P = 0.013). Cephalad displacement of the ETT either ≥5 mm or ≥2.5 mm was found in 28 and in 38 out of 88 infants after surgery, respectively. After performing multivariate analysis, the use of un-cuffed ETT was the sole exploratory variable predictive of tube tip displacement (OR 0.34, 95% CI 0.10 - 0.93 if ≥5 mm;and OR 0.24, 95% CI 0.08 - 0.75 if ≥2.5 mm displacement;P = 0.04 and 0.01, respectively). Conclusion: Proximal displacement of the ETT during cardiac surgery occurs more frequently in infants with un-cuffed ETT.

关键词： Endotracheal Tube Disposition Pediatric Cardiac Surgery Neonates Infants Risk Factor

Factor Structure and Measurement Invariance of the Japanese Version of the Mother-to-Infant Bonding Scale

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Advances in Reproductive Sciences 2023年第4期11卷 159-170页

作者： Mami Yamamoto Fumie Takauma Katsuhiko Tada Kaori Baba Toshinori kitamura Graduate School of Nursing Science St. Luke’s International University Tokyo Japan Toubi Branch Bizen Public Health Center Okayama Japan Department of Obstetrics and Gynaecology National Hospital Organization Okayama Medical Centre Okayama Japan Unit for Mental Health Promotion Research Center for Social Science & Medicine Tokyo Metropolitan Institute of Medical Science Tokyo Japan kitamura Institute of Mental Health Tokyo Tokyo Japan kitamura KOKORO Clinic Mental Health Tokyo Japan T. and F. kitamura Foundation for Studies and Skill Advancement in Mental Health Tokyo Japan Department of Psychiatry Graduate School of Medicine Nagoya University Nagoya Japan

Background: Bonding disorders affect the growth and development of infants. In Japan, the Japanese version of the Mother-to-Infant Bonding Scale (MIBS-J) is widely used for early detection of bonding disorders. Repeated use of a questionnaire has problems of reduced validity. In order to correctly detect bonding disorders at multiple time points, it is necessary to confirm the measurement invariance of the scale. Baba et al. reported that invariance of the MIBS-J factor structure could only be obtained by abridging the scale into three items. Purpose: The aim of this study was to 1) confirm the factor structure and measurement invariance of the MIBS-J between two measurement times and 2) to examine factors that can be used without being affected by measurement time in order to identify item that contribute to measure met invariance. Methods: We analysed the data of 1049 and 878 mothers with a neonate collected in two waves: 5 days (Wave 1) and 1 month postpartum (Wave 2). Exploratory and confirmatory factor analyses were conducted on the data randomly divided into two groups in each wave. Results: The three-item model (MIBS-J items 1, 6, and 8) was most accepted. Measurement invariance and structural invariance were confirmed in the model. This was consistent with Baba et al.’s model. Conclusion: The three MIBS-J items showed measurement invariance and structural invariance in Japanese mothers during 1 month postpartum.

关键词： Bonding Disorders Mother-to-Infant Bonding Scale Factor Analysis Measurement Invariance

Effects of soil profile and characteristic of exciting force on propagation of ground vibrations

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Journal of Modern Transportation 2012年第3期20卷 129-137页

作者： Sunao KUNIMATSU Yoshihiro HIRAO Yasutoshi kitamura Institute for Geo-Resources and Environment National Institute of Advanced Industrial Science and Technology1-1-1 Higashi Tsukuba Ibaraki 305-8567 Japan Kobayashi Institute of Physical Research 3-20-41 Higashi-Motomachi Kokubunji Tokyo 185-0020 Japan Construction Engineering Research Institute Foundation 1-3-10 Turukabuto Nada-ku Kobe Hyogo 657-0011 Japan

Ground-borne vibrations caused by vibration sources such as road traffic and construction exhibit complicated properties during propagation from the vibration source to the inside of a building. In the present paper, a numerical analysis technique for the system of vibration source and propagation path of ground vibration is developed in order to systematically determine the propagation properties of the vibration as part of developing a predictive technique for exposure evaluations by vibrations in three directions at receiving points of vibration in the human body. First, the exciting forces in three directions for input into the numerical computation are inversely-estimated by using the measured acceleration rec- ords of the measurement points, which are near the vibration source. The thin-layered element method is used for numerical computation of the ground vibration. Then, the calculation results for the ground vibration obtained by using the estimated exciting force are compared with the measured results, and the influence of the stratified structure of the ground on the exciting force and the propagation properties of the ground vibration are studied. From these results, in a prediction of the ground vibration in three directions, it is emphasized that it is necessary to consider the influence of horizontal exciting force, although attention has been paid to only the vertical exciting force for simulating ground vibration.

关键词： ground-borne vibration vibration source exciting force stratified structure soil profile

Self-shaping of bioinspired chiral composites

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Acta Mechanica Sinica 2014年第4期30卷 533-539页

作者： Qing-Qing Rong Yu-Hong Cui Takahiro Shimada Jian-Shan Wang Takayuki kitamura Tianjin Key Laboratory of Modern Engineering Mechanics Department of MechanicsTianjin University Department of Mechanical Engineering and Science Kyoto University

Self-shaping materials such as shape memory polymers have recently drawn considerable attention owing to their high shape-changing ability in response to changes in ambient conditions, and thereby have promising applications in the biomedical, biosensing, soft robotics and aerospace fields. Their design is a crucial issue of both theoretical and technological interest. Motivated by the shape-changing ability of Towel Gourd tendril helices during swelling/deswelling, we present a strategy for realizing self-shaping function through the deformation of micro/nanohelices. To guide the design and fabrication of selfshaping materials, the shape equations of bent configurations, twisted belts, and helices of slender chiral composite are developed using the variation method. Furthermore, it is numerically shown that the shape changes of a chiral composite can be tuned by the deformation of micro/nanohelices and the fabricated fiber directions. This work paves a new way to create self-shaping composites.

关键词： Self-shaping · Bioinspired chiral composites ·Micro/nanohelices · Tendrils

Construction of Design Guidelines for Optimal Automotive Frame Shape Based on Statistical Approach and Mechanical Analysis

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Computer Modeling in Engineering & Sciences 2021年第8期128卷 731-742页

作者： Masanori Honda Chikara Kawamura Isamu Kizaki Yoichi Miyajima Akihiro Takezawa Mitsuru kitamura Mazda Motor Corporation 3-1 ShinchiFuchu-choAki-gunHiroshima730-8670Japan Department of Applied Mechanics and Aerospace Engineering School of Fundamental Science and EngineeringWaseda University3-4-1 OkuboShinjuku-kuTokyo169-8555Japan Division of Advanced Science and Engineering Graduate School of Advanced Science and EngineeringHiroshima University1-4-1 KagamiyamaHigashihiroshimaHiroshima739-8527Japan

A body frame composed of thin sheet metal is a crucial structure that determines the safety performance of a *** a correct weight and high-performance automotive body is an emerging engineering *** improve the performance of the automotive frame,we attempt to reconstruct its design criteria based on statistical and mechanical *** first,a fundamental study on the frame strength is conducted and a cross-sectional shape optimization problem is developed for designing the cross-sectional shape of an automobile frame having a very high mass efficiency for *** optimization is carried out using the nonlinear finite element method and a meta-modeling-based genetic *** analysis of the obtained set of optimal results is performed to identify the dominant design variables by employing the smoothing spline analysis of variance,the principal component analysis,and the self-organizing map *** relationship between the cross-sectional shape and the objective function is also analyzed by hierarchical clustering.A design guideline is obtained from these statistical approach results.A comparison between the statistically obtained design guideline and the conventional one based on the designers’experience is performed based on mechanical interpretation of the optimal cross-sectional ***,a mechanically reasonable new general-purpose design guideline is proposed for the cross-sectional shape of the automotive frame.

关键词： Automotive structure shape optimization data mining statistical approach crash-performance

Food processing wastewater purification by microalgae cultivation associated with high value-added compounds production——A review

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Chinese Journal of Chemical Engineering 2019年第12期27卷 2845-2856页

作者： Shuhong Li Shuang Zhao Siliang Yan Yiting Qiu Chunfeng Song Yang Li Yutaka kitamura State Key Laboratory of Food Nutrition and Safety Key Laboratory of Food Nutrition and SafetyMinistry of EducationCollege of Food Engineering and BiotechnologyTianjinUniversity of Science&TechnologyTianjin 300457China Tianjin Key Laboratory of Indoor Air Environmental Quality Control School of Environmental Science and EngineeringTianjin University135 Yaguan RoadHaihe Education ParkTianjin 300350China Tianjin Institute of Industrial Biotechnology Chinese Academy of SciencesTianjin 300308China Graduate School of Life and Environmental Sciences University of Tsukuba1-1-1TennodaiTsukubaIbaraki 305-8572Japan

Microalgae have been considered as an efficient microorganism for wastewater treatment with simultaneously bioenergy and high value-added compounds ***,the high energy cost associated with complicated biorefinery(*** cultivation,harvesting,drying,extraction,conversion,and purification)is a critical challenge that inhibits its large-scale *** different nutrition(***,nitrogen and phosphorous)sources,food processing wastewater is a relative safe and suitable one for microalgae cultivation due to its high organic content and low *** this review,the characteristic of different food wastewater is summarized and *** potential routes of value-added products(***,pigment,polysaccharide,and amino acid)production along with wastewater purification are *** existing challenges(*** cost,efficiency and mechanism)of microalgal-based wastewater treatment are also *** prospective of microalgae-based food processing wastewater treatment strategies(such as microalgae-bacteria consortium,poly-generation of bioenergy and value-added products)is *** can be observed that food wastewater treatment by microalgae could be a promising strategy to commercially realize waste source reduce,conversion and reutilization.

关键词： Food wastewater Microalgae Value-added produce Biofuel Polysaccharide Protein

Performance of Low-Dissipation Euler Fluxes and Preconditioned LU-SGS at Low Speeds

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Communications in Computational Physics 2011年第6期10卷 90-119页

作者： Keiichi kitamura Eiji Shima Keiichiro Fujimoto Z.J.Wang JAXA’s Engineering Digital Innovation(JEDI)Center Japan Aerospace Exploration Agency3-1-1 YoshinodaiChuuouSagamiharaKanagawa252-5210Japan JAXA’s Engineering Digital Innovation(JEDI)Center Japan Aerospace Exploration Agency2-1-1 SengenTsukubaIbaraki305-8505Japan Department of Aerospace Engineering Iowa State University2271 Howe HallAmesIA 50011USA.

In low speed flow computations,compressible finite-volume solvers are known to a)fail to converge in acceptable time and b)reach unphysical *** problems are known to be cured by A)preconditioning on the time-derivative term,and B)control of numerical dissipation,*** have been several methods of A)and B)proposed ***,it is unclear which combination is the most accurate,robust,and efficient for low speed *** carried out a comparative study of several well-known or recently-developed low-dissipation Euler fluxes coupled with a preconditioned LU-SGS(Lower-Upper Symmetric Gauss-Seidel)implicit time integration scheme to compute steady *** a series of numerical experiments,accurate,efficient,and robust methods are suggested for low speed flow computations.

关键词： All-speed scheme low-dissipation preconditioning LU-SGS