检索结果-南通市图书馆

Interactive Restoration of Three-Dimensional Implicit Surface with Irregular Parts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2023年第9期136卷 2111-2125页

作者： Jiayu Ren Yoshihisa Fujita susumu nakata Graduate School of Information Science and Engineering Ritsumeikan UniversityShiga525-8577Japan College of Information Science and Engineering Ritsumeikan UniversityShiga525-8577Japan

Implicit surface generation based on the interpolation of surface points is one of the well-known modeling methods in the area of computer *** methods for the implicit surface reconstruction from surface points have been proposed on the basis of radial basis functions,a weighted sum of local functions,splines,wavelets,and combinations of ***,if the surface points contain errors or are sparsely distributed,irregular components,such as curvature-shaped redundant bulges and unexpectedly generated high-frequency components,are commonly *** paper presents a framework for restoring irregular components generated on and around *** are assumed to specify local masks that cover irregular components and parameters that determine the degree of *** algorithm in this paper removes the defects based on the user-specific masks and *** have shown that the proposed methods can effectively remove redundant protrusions and jaggy noise.

关键词： Shape modeling implicit surfaces interactive restoration

A Simplified Approach of Open Boundary Conditions for the Smoothed Particle Hydrodynamics Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2021年第11期129卷 425-442页

作者： Thanh Tien Bui Yoshihisa Fujita susumu nakata Graduate School of Information Science and Engineering Ritsumeikan UniversityShiga525-8577Japan College of Information Science and Engineering Ritsumeikan UniversityShiga525-8577Japan

In this paper,we propose a simplified approach of open boundary conditions for particle-based fluid simulations using the weakly compressible smoothed-particle hydrodynamics(SPH)*** this scheme,the values of the inflow/outflow particles are calculated as fluid particles or imposed desired values to ensure the appropriate evolution of the flow field instead of using a renormalization process involving the fluid *** concentrate on handling the generation of new inflow particles using several simple approaches that contribute to the flow field *** advantages of theδ^(+).-SPH scheme,specifically the particle shifting technique,were successfully applied to correct the position,velocity,and pressure terms of the ***,unexpected errors were removed and tensile instabilities of the particles were *** proposed technique is validated for several benchmark test cases,and the tests show that the results match the reference solutions well.A viscous open-channel flow is used to demonstrate the stability of the flow field during the computational *** on this stability,we compress the computational domain to a lower resolution in a second test case while preserving the accuracy of the *** over a backward-facing step is used to highlight the challenges of inflow boundary conditions with prescribed or non-prescribed *** developed technique is well suited to the wall boundaries and the evolution of the flow *** results demonstrate the robustness and versatility of the proposed technique for a variety of simulations.

关键词： Fluid simulation smoothed particle hydrodynamics open boundaries

Performance Evaluation of Electromagnetic Shield Constructed from Open-Cell Metal Foam Based on Sphere Functions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2022年第7期132卷 43-53页

作者： Yuya Hanaoka Taku Itoh Kohei Tateyama susumu nakata Keiko Watanabe Graduate School of Industrial Technology Nihon UniversityNarashinoChiba 275-8575Japan College of Industrial Technology Nihon UniversityNarashinoChiba 275-8575Japan College of Science and Engineering Ritsumeican UniversityKusatsuShiga 525-8577Japan College of Information Science and Engineering Ritsumeican UniversityKusatsuShiga 525-8577Japan

This study evaluates the performance of a model of open-cell metal foams generated by sphere *** this end,an electromagnetic shield constructed from the model was inserted between two horn antennas in an electromagnetic wave propagation *** foam-hole diameter in the electromagnetic shield model was varied as d=2.5 and 5.0 mm,and the frequency of the electromagnetic waves was varied from 3 to 13 *** the numerical experiments of shield effectiveness,the shields with foam holes of both diameters attenuated the electromagnetic waves across the studied frequency *** shield effectiveness was enhanced at low frequencies and in the shield with smaller hole diameter.

关键词： Electromagnetic propagation electromagnetic shielding materials metal foams numerical simulation

PARTICLE-BASED TRANSPARENT FUSED VISUALIZATION APPLIED TO MEDICAL VOLUME DATA

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Modeling, Simulation, and Scientific Computing 2013年第S1期4卷 104-114页

作者： KYOKO HASEGAWA SAORI OJIMA YOSHIYUKI SHIMOKUBO susumu nakata KOZABURO HACHIMURA SATOSHI TANAKA College of Information Science and Engineering Ritsumeikan University Noji Higashi 1-1-1 KusatsuShiga525-8577Japan Graduate School of Science and Engineering Ritsumeikan University Noji Higashi 1-1-1 KusatsuShiga525-8577Japan

This paper proposes a method to create 3D fusion images,such as volume–volume,volume–surface,and surface–surface *** method is based on the particle-based rendering,which uses tiny particles as rendering *** method can create natural and comprehensible 3D fusion images simply by merging particles prepared for each element to be ***,the method does not require particle sorting along the line of sight to realize right depth *** apply our method to realize comprehensible visualization of medical volume data.

关键词： Particle-based rendering fused visualization stochastic particle generation.

Computationally Efficient Large-Eddy Simulation of Periodic Unsteady Flow using Harmonic Balance Method

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 Thermal Science 2022年第1期31卷 62-71页

作者： YUMA Iwamoto susumu Teramoto KOJI Okamoto Department of Aeronautics and Astronautics University of TokyoTokyo 113-8656Japan Department of Advanced Energy University of TokyoTokyo 113-8656Japan

To improve the efficiency and fidelity of the numerical analysis for cascade flutter, we propose an efficient scale-resolving simulation method dedicated to time-periodic flows by incorporating the harmonic balance approach into the large-eddy simulation. This method combined convergence calculations of the steady-state problem based on the harmonic balance method for periodic components, and the nonlinear time-marching method for turbulent fluctuations. Using the proposed method, deterministic periodic components and stochastic turbulent fluctuations were calculated simultaneously, and the effect of turbulent fluctuations on deterministic periodic components was directly calculated without using turbulence models. In this paper, we explain the algorithm and feature of this simulation technique and present the results of the computation for channel flow excited in the streamwise direction as an analysis example using the proposed method. In order to validate the proposed method, an analysis of sinusoidally pulsating channel flow at the central friction-velocity Reynolds numbers Rer = 180 was conducted, confirming that the amplitude and phase of the mean velocity oscillation computed by the proposed method were in good agreement with those of the conventional LES. The present calculation achieved an order of magnitude improvement in computational efficiency compared to conventional LES.

关键词： harmonic balance LES turbulent channel flow

Long-term submergence of non-methanogenic oxic upland field soils helps to develop the methanogenic archaeal community as revealed by pot and field experiments

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2020年第1期30卷 62-72页

作者： Takeshi WATANABE susumu ASAKAWA Koichi HAYANO Graduate School of Bioagricultural Sciences Nagoya UniversityNagoya 464-8601(Japan) Kyushu National Agricultural Experiment Station NishigoshiKumamoto 861-1192(Japan)

The community structure of methanogenic archaea is relatively stable,i.e.,it is sustained at a high abundance with minimal changes in composition,in paddy field soils irrespective of submergence and *** contrast,the abundance in non-methanogenic oxic soils is much lower than that in paddy field *** study aimed to describe methanogenic archaeal community development following the long-term submergence of non-methanogenic oxic upland field soils in pot and field *** the pot experiment,a soil sample obtained from an upland field was incubated under submerged conditions for 275 *** samples periodically collected were subjected to culture-dependent most probable number(MPN)enumeration,polymerase chain reaction-denaturing gradient gel electrophoresis(PCR-DGGE)analysis of archaeal 16 S r RNA gene,and quantitative PCR analysis of the methyl-coenzyme M reductase alpha subunit gene(mcr A)of methanogenic *** abundance of methanogenic archaea increased from 102 to 103 cells g-1 dry soil and 104 to 107 copies of mcr A gene g-1 dry soil after *** no methanogenic archaeon was detected prior to incubation by the DGGE analysis,members from Methanocellales,Methanosarcinaceae,and Methanosaetaceae proliferated in the soils,and the community structure was relatively stable once *** the field experiment,the number of viable methanogenic archaea in a rice paddy field converted from meadow(reclaimed paddy field)was monitored by MPN enumeration over five annual cycles of field *** was also determined simultaneously in a paddy field where the plow layer soil from a farmer’s paddy field was dressed onto the meadow(dressed paddy field)and an upland crop field converted from the meadow(reclaimed upland field).The number of viable methanogenic archaea in the reclaimed paddy field was below the detection limit before the first cultivation of rice and in the reclaimed upland ***,the number gradually increased

关键词： denaturing gradient gel electrophoresis mcrA gene methanogenic archaea microbial community structure microbial habit most probable number method paddy field soil qPCR

Xanthogranulomatous cholangitis causing obstructive jaundice:A case report

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2006年第27期12卷 4428-4430页

作者： susumu Kawate susumu Ohwada Hayato Ikota Kunihiro Hamada Kenji Kashiwabara Yasuo Morishita Department of Surgery Gunma University Graduate School of MedicineGunma 371-8511Japan Clinical Department of Pathology Gunma University HospitalMaebashiGunma 371-8511Japan

This article reports the case of a 34-year-old woman with xanthogranulomatous cholangitis who developed obstructive jaundice. Microscopically, the bile duct was surrounded and narrowed by a xanthogranulomatous lesion, but no xanthogranulomatous cholecystitis was seen. Although percutaneous cholangiograms done via the transhepatic biliary drainage showed smooth narrowing of the upper to middle bile duct, the cytology of bile was diagnosed as class V adenocarcinoma. Therefore, right extended hepatectomy and extrahepatic bile duct resection were performed. The differentiation of benign and malignant strictures at the hepatic hilum is often difficult. Xanthogranulomatous cholangitis is one possible diagnosis of a bile duct stricture. Precise review of all the preoperative information is required to make a correct diagnosis.

关键词： Xanthogranulomatous cholangitis Obstructive jaundice Bile cytology Bile duct stricture

susumu Tamai MD, PhD——Autobiography

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华显微外科杂志 2020年第2期43卷 I0007-I0008页

作者： susumu Tamai 河南省平顶山市湛河骨伤科医院手显微外科河南平顶山467000

I follow a long line of ancestors in my family *** first physician in my family dates back to 1650 and this occupation continues for 370 years up to the present time.I was born March 13,1935,in Kashihara city,in Nara,Japan.I graduated with my medical degree from Nara Medical University in 1959,continuing the line of 21 generations of physicians in my family.

关键词： occupation continue Auto

Plasma preparation method and tribological properties of diamond-like carbon coating on magnesium alloy AZ31 substrate

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2019年第11期62卷 1939-1947页

作者： HAN BeiBei JU DongYing SATO susumu ZHAO HuiJun Department of Electronic Engineering Graduate School of EngineeringSaitama Institute of TechnologyFukaya 369-0293Japan Advanced Science Institute Saitama Institute of TechnologyFukaya 369-0293Japan Ningbo Institute of Materials Industry Innovation Ningbo 315033China School of Mechanical Engineering Hangzhou Dianzi UniversityHangzhou 310018China Department of Information System Saitama Institute of TechnologyFukaya 369-0293Japan

Magnesium alloys are light weight and exhibit good recyclability but suffer from low hardness and wear *** this study,the hardness and wear resistance of AZ31 magnesium alloy were improved by depositing diamond-like carbon(DLC)films as hard protective coatings using ion-beam-enhanced deposition with various CH4/H2 ratio,gas flow rates and accelerating *** supporting effect of the magnesium alloy was enhanced by the production of a graded interfacial layer which is composed of film atoms and substrate *** composition and mechanical properties of the DLC coatings were characterized using scanning electron microscopy(SEM),Raman spectroscopy,Rockwell test and *** tribological properties of the coating were also investigated using a frictional surface microscope with an in situ observation system and friction force *** DLC films were characterized by a lower intensity ratio of the D-peak to G-peak(ID/IG),higher hardness,and improved tribological properties when deposited at a lower accelerating voltage(6 kV).At the CH4/H2 ratio of 1:99 and 6 sccm/6 kV,minimum ID/IG values of 0.62,relatively low friction force value of 0.12 N,and a maximum hardness of 4056HV were attained *** addition,the DLC film exhibited improved wear resistance and a shallower wear track at this condition.

关键词： DLC film magnesium alloy plasma preparation hardness wear resistance