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Coupled simulation of BES-CFD and performance assessment of energy recovery ventilation system for office model

Journal of Central South University 2012年第3期19卷 633-638页

作者： Yunqing FAN T.Hayashi k.ito Interdisciplinary Graduate School of Engineering Science(IGSES) Kyushu University

Thermal comfort and indoor air quality as well as the energy efficiency have been recognized as essential parts of sustainable building assessment. This work aims to analyze the energy conservation of the heat recovery ventilator and to investigate the effect of the air supply arrangement. Three types of mixing ventilation are chosen for the analysis of coupling ANSYS/FLUENT （a computational fluid dynamics （CFD） program） with TRNSYS （a building energy simulation （BES） software）. The adoption of mutual complementary boundary conditions for CFD and BES provides more accurate and complete information of indoor air distribution and thermal performance in buildings. A typical office-space situated in a middle storey is chosen for the analysis. The office-space is equipped with air-conditioners on the ceiling. A heat recovery ventilation system directly supplies flesh air to the office space. Its thermal performance and indoor air distribution predicted by the coupled method are compared under three types of ventilation system. When the supply and return openings for ventilation are arranged on the ceiling, there is no critical difference between the predictions of the coupled method and BES on the energy consumption of HVAC because PID control is adopted for the supply air temperature of the occupied zone. On the other hand, approximately 21% discrepancy for the heat recovery estimation in the maximum between the simulated results of coupled method and BES-only can be obviously found in the floor air supply ventilation case. The discrepancy emphasizes the necessity of coupling CFD with BES when vertical air temperature gradient exists. Our future target is to estimate the optimum design of heat recovery ventilation system to control CO2 concentration by adjusting flow rate of flesh air.

关键词： building energy simulation computational fluid dynamics (CFD) FLUENT TRNSYS energy saving

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Dynamic Evasion-Interrogation Games with Uncertainty in the Context of Electromagetics

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Numerical Mathematics(Theory,Methods and Applications) 2011年第3期4卷 359-378页

作者： H.T.Banks Shuhua Hu k.ito Sarah Grove Muccio Center for Research in Scientific Computation North Carolina State UniversityRaleighNC 27695-8212USA.

We consider two player electromagnetic evasion-pursuit games where each player must incorporate significant uncertainty into their design strategies to disguise their intension and confuse their *** this paper,the evader is allowed to make dynamic changes to his strategies in response to the dynamic input with uncertainty from the *** problem is formulated in two different ways;one is based on the evolution of the probability density function of the intensity of reflected signal and leads to a controlled forward kolmogorov or Fokker-Planck *** other formulation is based on the evolution of expected value of the intensity of reflected signal and leads to controlled backward kolmogorov *** addition,a number of numerical results are presented to illustrate the usefulness of the proposed approach in exploring problems of control in a general dynamic game setting.

关键词： Electromagnetic evasion-pursuit uncertainty feedback control computational methods kolmogorov and Fokker-Planck equations.

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Determination of Interrogating Frequencies to Maximize Electromagnetic Backscatter from Objects with Material Coatings

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Communications in Computational Physics 2006年第2期1卷 362-382页

作者： H.T.Banks k.ito J.Toivanen Center for Research in Scientific Computation Box 8205North Carolina State UniversityRaleighNC 27695-8205USA

The electromagnetic backscattering of a crosscut of a cruise missile coated by a thin homogeneous layer made of radar absorbent material is modeled using a finite element *** on the radar cross section and a reflection coefficient,optimization problems are formulated for evaders and interrogators leading to optimal material parameters for the coating and optimal monostatic radar operating frequencies,*** coating materials are constructed for several radar *** only dielectric permittivity gives a narrow frequency range of high absorption while also tuning magnetic permeability widens it *** the coating layers considered do not provide substantial reduction of backscattering in the entire frequency range from 0.2 to 1.6 *** experiments also demonstrate that the reflection coefficient based on a simple planar geometry can predict well the strength of radar cross section in the sector of interest with a substantially reduced computational burden.

关键词： Radar cross section radar absorbent material optimization finite element model

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地震现象的新观点

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世界地震译丛 1995年第3期26卷 28-36页

作者： k.ito 郑文衡王静瑶国家地震局地震研究所

本文综述断裂和碎形理论的最新进展。以分形的观点解释地震学经验公式,提出了地震作为自组织临界现象(SOC)的观点。地震的发生是地壳中的能量耗散过程,而地壳构造能量连续地得到补给。地壳的自组织行为达到临界状态,时间上和空间上的分... 详细信息

本文综述断裂和碎形理论的最新进展。以分形的观点解释地震学经验公式,提出了地震作为自组织临界现象(SOC)的观点。地震的发生是地壳中的能量耗散过程,而地壳构造能量连续地得到补给。地壳的自组织行为达到临界状态,时间上和空间上的分形结构就自然地呈现出来。众所周知,在地震学中幂次律关系即是地壳临界状态的表述。本文还提出了一个地震的SOC模型,用以解释古登堡-里克特公式、大森的余震公式以及震源的分形分布。地震现象的新观点与其它用一个完整的理论来研究复杂的现象的学科一样,有着共同的立足点。

关键词：地震断裂碎形理论临界现象

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Thermoluminescence Colour Image Analyses of Lake Sediments

Thermoluminescence Colour Image Analyses of Lake Sediments

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作者： N.Hasebe k.ito A.Inagaki H.Yamada Institute of Nature and Environmental Technology Kanazawa University Graduate School of Natural Science and Technology Kanazawa University

INTRODUCTION:Luminescence dating observes the natural accumulated radiation damage caused by radioisotopes such as U and Th as the form of glow after stimulation by heating or *** luminescence is observed at various wavelength bands and their characteristics have been studied mainly on quartz and feldspar. The emission color of luminescence can be recorded easily by using thermoluminescence color image(TLCI) analysis for samples artificially irradiated with gamma -*** TLCI is applied to polymineral from

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Catalysis on Interface of Nano-oxide and Nano-zeolite

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复旦学报（自然科学版） 2007年第5期46卷 867-页

作者： k.ito F.Jan S.Asaoka Faculty of Environmental Engineering the University of Kitakyushu

1 Results The catalysts which can efficiently hydro-reform higher n-paraffin to lower isoparaffins for environmentally-friendly gasoline were studied. The catalysts were examined by the conversion of n-hexadecane, n-C16H34 to i-C6H14—*** tri-modally nano-porous catalysts composed of (Ni-Mo)/[γ-Al2O3], nano-oxide, and nano-crystalline zeolite had some active and selective performance because of the interface between nano-oxide and nano-zeolite. The catalyst composed of nano-crystalline MFI or BE...

关键词： nano-pore nano-oxide nano-zeolite nano-interface

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DEVELOPMENT OF THE NOISE GUIDANCE SYSTEM

DEVELOPMENT OF THE NOISE GUIDANCE SYSTEM

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1992 International Symposium on Electromagnetic Compatibility(EMC’92/Beijing)

作者： T.Takahashi E.Gotoh k.Naemura N.Schibuya k.ito Takushoku University Tatemachi 815-1 HachiojiTokyo 193Japan Matsushita Electric Industrial Co.Ltd.kadoma 1006 Osaka 571Japan

＜正＞*** Electromagnetic interference（EMI） of electronic equipments is regulated by government *** manufacturer, the hardware engineer and circuit designer are required to have ability of analyzing noise mechanism and of suppressing *** novice engineers may tackle a noise problems without enough experiment for understanding them. Noise reduction technique is very difficult to learn,because it consists of theoretical and experimental

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Free Volume and Permeabilities of O2 and H2 in Nafion Membranes

Free Volume and Permeabilities of O2 and H2 in Nafion Membra...

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The 9th International Workshop on Positron and Positronium Chemistry

作者： Y.kobayashi H.F.M.Mohamed k.ito N.Takimoto Y.Takeoka A.Ohira NMIJ National Institute of Advanced Industrial Science and TechnologyTsukubalbaraki 305-8565Japan FC-Cubic National Institute of Advanced Industrial Science and Technology Tokyo 135-0064Japan Physics DepartmentFaculty of ScienceMinia University B.O.61519 MiniaEgypt NMIJ National Institute of Advanced Industrial Science and TechnologyTsukubaIbaraki 305-8565Japan FC-Cubic National Institute of Advanced Industrial Science and Technology Tokyo 135-0064Japan Deparment of ChemistrySofia UniversityTokyo 102-8554Japan

Gas permeation in Nation membranes for polymer electrolyte fuel cells(PEFC)has been investigated based on free volume evaluated from ortho-positronium *** linear correlations between the logarithm of the O and H permeabilities in the dry state at different temperatures and reciprocal free volume indicate that gas permeation in dry Nation is

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Challenging situation of coronary artery anomaly associated with ischemia and/or risk of sudden death

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World Journal of Cardiology 2024年第4期16卷 173-176页

作者： Shigenori ito Division of Cardiology Sankuro HospitalToyota 471-0035Japan

Coronary artery anomaly is known as one of the causes of angina pectoris and sudden death and is an important clinical entity that cannot be *** incidence of coronary artery anomalies is as low as 1%-2%of the general population,even when the various types are *** anomalies are practically challenging when the left and right coronary ostium are not found around their normal positions during coronary angiography with a *** there is atherosclerotic stenosis of the coronary artery with an anomaly and percutaneous coronary intervention(PCI)is required,the suitability of the guiding catheter at the entrance and the adequate back up force of the guiding catheter are *** level of PCI risk itself should also be considered on a caseby-case *** this case,emission computed tomography in the R-1 subtype single coronary artery proved that ischemia occurred in an area where the coronary artery was not visible to the naked *** follow-up would be crucial,because sudden death may occur in single coronary *** prevent atherosclerosis with full efforts is also important,as the authors indicated admirably.

关键词： Coronary artery anomaly Single coronary artery Ischemia Sudden death Percutaneous coronary intervention Coronary vessel anomalies Myocardial ischemia Sudden cardiac death

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Bicuspidization Using the Open-Sleeve Technique for Congenital Aortic Stenosis during Infancy

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Congenital Heart Disease 2024年第2期19卷 177-183页

作者： Toshi Maeda Hiroki ito keiichi Hirose kisaburo Sakamoto Departments of Cardiovascular Surgery Mt.Fuji Shizuoka Children’s HospitalShizuoka420-8660Japan

Congenital aortic stenosis(cAS)frequently requires intervention during the neonatal or infantile ***,surgical repair is challenging because of the narrow surgical *** performed bicuspidization using the open-sleeve technique for cAS with a unicuspid aortic valve in two ***,the patients were doing well without reintervention for the aortic valve for 8 and 6 years,*** aortic annular diameter increased along with somatic *** for neonates or infancy can be performed safely using the open-sleeve technique as its midterm results have been satisfactory.

关键词： Aortic valve repair infant bicuspidization open-sleeve technique

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