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Space–time finite element method with domain reduction techniques for dynamic soil–structure interaction problems

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International Journal of Mechanical System Dynamics 2024年第2期4卷 117-130页

作者： Vikas Sharma Shion Shimizu kazunori Fujisawa Division of Environmental Science and Technology Graduate School of AgricultureKyoto UniversityKyotoJapan

Design of earth structures,such as dams,tunnels,and embankments,against the vibrational loading caused by high-speed trains,road traffic,underground explosions,and,more importantly,earthquake motion,demands solutions of the dynamic soil–structure Interaction(SSI)*** paper presents a velocity-based space–time finite element procedure,v-ST/finite element method(FEM),to solve dynamic SSI *** main goal of this study is to present the computation details of implementing viscous boundary conditions of Lysmer–Kuhlemeyer to truncate the unbounded soil ***,additional time-dependent boundary conditions,in terms of the free-field response,are included to facilitate energy flow from the far field to the computation domain at the vertical truncated *** the FEM,seismic input motion is applied to an effective nodal force vector,which can be obtained explicitly in the numerical ***,the response of a concrete gravity dam resting on an elastic half-space to the horizontal component of earthquake motion is computed and successfully compared with the results of semidiscrete FEM using the Newmark-βmethod.

关键词： absorbing boundary domain reduction FEM soil-structure interactions space-time

Natural Convection Melting in a Rectangular Heat Storage Tank of Carbon Nanotube Dispersed Latent Heat Storage Material

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Journal of Thermal Science 2024年第3期33卷 847-855页

作者： Shin-ichi MORITA Tomoya SAITO kazunori TAKAI Yasutaka HAYAMIZU Naoto HARUKI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer

Optimal interval for delayed retrieval surgery with reciprocating morcellators after enucleation of giant prostatic hyperplasia in holmium laser enucleation of the prostate

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Asian Journal of Urology 2024年第3期11卷 423-428页

作者： Fumiyasu Endo Masaki Shimbo Kenji Komatsu Kazuhiro Ohwaki kazunori Hattori Department of Urology St.Luke’s International Hospital9-1 Akashi-choChuo-kuTokyoJapan Department of Hygiene and Public Health Teikyo University School of Medicine Graduate School of Medicine2-11-1 KagaItabashi-kuTokyoJapan

Objective:The aim of this research was to evaluate the efficiency of reciprocating morcellation for removing giant benign prostatic hyperplasia during holmium laser enucleation of the prostate,investigate whether performing morcellation as a two-stage procedure improves tissue retrieval efficiency,and seek to determine the optimal interval between the two ***:This study included nine cases of holmium laser enucleation of the prostate with an enucleated prostate weight exceeding 200 g,indicative of substantial prostate *** was performed on Day 0(n=4),Day 4(n=1),Day 6(n=1),and Day 7(n=3).The intervals were compared regarding the morcellation efficiency,beach ball presence,and ***:The mean estimated prostate volume was 383(range 330e528)mL;the median enucleation weight was 252(interquartile range[IQR]222,342)g;and the median enucleation time was 83(IQR 62,100)*** mean morcellation efficiency was 1.44(SD 0.55)g/min on Day 0 and 13.69(SD 2.46)g/min on day *** morcellation efficiency was 4.15 g/min and 10.50 g/min on Day 4 and Day 6,respectively,with significantly higher in the two-stage group compared to one-stage group(11.0 g/min vs.1.5 g/min;p=0.014).Efficiency was strongly correlated with intervals(p and two-stage surgery groups,***:The efficiency of two-stage morcellation with reciprocating morcellators was highly related to the postoperative interval,with the maximum efficiency reached on Day 7.

关键词： Holmiumlaser enucleationofthe prostate Reciprocating morcellator Giant adenoma Two-stage surgery

External defects and severity level evaluation of potato using single and multispectral imaging in near infrared region author links open overlay panel

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Information Processing in agriculture 2024年第1期11卷 80-90页

作者： Dimas Firmanda al Riza Slamet Widodo Kazuya Yamamoto kazunori Ninomiya Tetsuhito Suzuki Yuichi Ogawa Naoshi Kondo Laboratory of Biosensing Engineering Graduate School of AgricultureKyoto UniversityKitashirakawaKyoto 6068267Japan Department of Biosystems Engineering Faculty of Agricultural TechnologyUniversitas BrawijayaJl.VeteranMalang 65145Indonesia Department of Mechanical and Biosystem Engineering Bogor Agricultural UniversityJl.Raya Darmaga Kampus IPB DarmagaBogor 16680Indonesia Technology Development Department Shibuya Seiki Co.Ltd.66Takaoka-choMatsuyamaEhime 7918036Japan

Non-invasive potato defects detection has been demanded for sorting and grading *** on the classification of the defects has been available,however,investigation on the severity level calculation is *** the detection of the common scab,it has been found that imaging in the infrared region provide an interesting characteristic that could distinguish defected area to normal ***,investigations on this wavelength range is interesting to add more knowledge and for *** this research,the multispectral image has been obtained and investigated especially at three wavelengths(950,1150,1600 nm).Image pre-processing and pseudo-color conversion techniques were explored to enhance the contrast between defects,normal background skin area and soil *** show that external defects,such as common scab and some mechanical damage types,appear brighter in the near infrared region,especially at 1600 nm against the normal skin *** has been found that pseudo-color images conversion provides more information regarding type if surface characteristics compared to grayscale single *** segmentation using pseudo-color images after multiplication operation pre-processing could be used for common scab and mechanical damage detection excluding soil deposits with a Dice Sorensen coefficient of *** addition,image segmentation using single image at 1600 nm shown relatively better results with Dice Sorensen coefficient of 0.72 with note that thick soil deposits will also be *** severity level evaluation had an R2 correlation of 0.84 against standard measurements of severity.

关键词： Multispectral imaging Pseudo-color Common scab External defects Near infrared

Addition Formulas of Leaf Functions and Hyperbolic Leaf Functions

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Computer Modeling in Engineering & Sciences 2020年第5期123卷 441-473页

作者： kazunori Shinohara Department of Mechanical Systems Engineering Daido UniversityNagoya457-8530Japan

Addition formulas exist in trigonometric ***-angle and half-angle formulas can be derived from these ***,the relation equation between the trigonometric function and the hyperbolic function can be derived using an imaginary *** inverse hyperbolic function arsinher(r)■ro 1/√1+t^(2)dt p1tt2 dt is similar to the inverse trigonometric function arcsiner(r)■ro 1/√1+t^(2)dt p1t2 dt,such as the second degree of a polynomial and the constant term 1,except for the sign−and+.Such an analogy holds not only when the degree of the polynomial is 2,but also for higher *** such,a function exists with respect to the leaf function through the imaginary number i,such that the hyperbolic function exists with respect to the trigonometric function through this imaginary *** this study,we refer to this function as the hyperbolic leaf *** making such a definition,the relation equation between the leaf function and the hyperbolic leaf function makes it possible to easily derive various formulas,such as addition formulas of hyperbolic leaf functions based on the addition formulas of leaf *** the addition formulas,we can also derive the double-angle and half-angle *** then verify the consistency of these formulas by constructing graphs and numerical data.

关键词： Leaf functions hyperbolic leaf functions lemniscate functions Jacobi elliptic functions ordinary differential equations nonlinear equations

Lemniscate of Leaf Function

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Computer Modeling in Engineering & Sciences 2021年第1期126卷 275-292页

作者： kazunori Shinohara Department of Mechanical Systems Engineering Daido University10-3 Takiharu-choMinami-kuNagoya457-8530Japan

A lemniscate is a curve defined by two foci,F_(1) and F_(2).If the distance between the focal points of F_(1)−F_(2) is 2a(a:constant),then any point P on the lemniscate curve satisfy the equation PF_(1)·PF_(2)=a^(2).Jacob Bernoulli first described the lemniscate in *** Fagnano discovered the double angle formula of the lemniscate(1718).The Euler extended the Fagnano’s formula to a more general addition theorem(1751).The lemniscate function was subsequently proposed by Gauss around the year *** insights were summarized by Jacobi as the theory of elliptic functions.A leaf function is an extended lemniscate *** formulas of leaf functions have been presented in previous papers;these included the addition theorem of this function and its application to nonlinear *** this paper,the geometrical properties of leaf functions at n=2 and the geometric relation between the angle θ and lemniscate arc length l are presented using the lemniscate *** relationship between the leaf functions sleaf_(2)(l)and cleaf_(2)(l)is derived using the geometrical properties of the lemniscate,similarity of triangles,and the Pythagorean *** the literature,the relation equation for sleaf_(2)(l)and cleaf_(2)(l)(or the lemniscate functions,sl(l)and cl(l))has been derived analytically;however,it is not derived geometrically.

关键词： Geometry lemniscate of Bernoulli leaf functions lemniscate functions Pythagorean theorem triangle similarity

Weakly Closed Graphs and F-Purity of Binomial Edge Ideals

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Algebra Colloquium 2018年第4期25卷 567-578页

作者： kazunori Matsuda Kitami Institute of Technology Kitami

Herzog,Hibi,Hreinddttir et *** the class of closed graphs,and they proved that the binomial edge ideal JG of a graph G has quadratic GrSbner bases if G is *** this paper,we introduce the class of weakly closed graphs as a generalization of the closed graph,and we prove that the quotient ring S/JG of the polynomial ring S=K[x1,...,xn,y1,...,yn]with K a field and n=|V(G)|is F-pure if G is weakly *** fact is a generalization of Ohtani's theorem.

关键词： binomial edge ideal closed graph weakly closed graph F-pure

Exact Solutions of the Cubic Duffing Equation by Leaf Functions under Free Vibration

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Computer Modeling in Engineering & Sciences 2018年第5期115卷 149-215页

作者： kazunori Shinohara Daido University 10-3 Takiharu-choMinami-kuNagoya 457-8530Japan

Exact solutions of the cubic Duffing equation with the initial conditions are *** exact solutions are expressed in terms of leaf functions and trigonometric *** leaf function r=sleafn(t)or r=cleafn(t)satisfies the ordinary differential equation dx2/dt2=-*** second-order differential of the leaf function is equal to-n times the function raised to the(2n-1)power of the leaf *** using the leaf functions,the exact solutions of the cubic Duffing equation can be derived under several *** solutions are constructed using the integral functions of leaf functions sleaf2(t)and cleaf2(t)for the phase of a trigonometric *** the leaf function and the trigonometric function are used in combination,a highly accurate solution of the Duffing equation can be easily obtained based on the data of leaf *** this study,seven types of the exact solutions are derived from leaf functions;the derivation of the seven exact solutions is detailed in the ***,waves obtained by the exact solutions are graphically visualized with the numerical results.

关键词： Duffing equation nonlinear equations ordinary differential equation leaf functions

Damped and Divergence Exact Solutions for the Duffing Equation Using Leaf Functions and Hyperbolic Leaf Functions

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Computer Modeling in Engineering & Sciences 2019年第3期118卷 599-647页

作者： kazunori Shinohara Daido University 10-3 Takiharu-choMinami-kuNagoya 457-8530Japan

According to the wave power rule,the second derivative of a functionχ(t)with respect to the variable t is equal to negative n times the functionχ(t)raised to the power of 2n?*** the ordinary differential equations numerically results in waves appearing in the *** ordinary differential equation is very simple;however,waves,including the regular amplitude and period,are drawn in the *** this study,the function for obtaining the wave is called the leaf *** on the leaf function,the exact solutions for the undamped and unforced Duffing equations are *** the ordinary differential equation,in the positive region of the variableχ(t),the second derivative d^2χ(t)/dt^2 becomes ***,in the case that the curves vary with the time under the conditionχ(t)>0,the gradient dχ(t)/d constantly decreases as time *** is,the tangential vector on the curve of the graph(with the abscissa and the ordinate χ(t)changes from the upper right direction to the lower right direction as time *** the other hand,in the negative region of the variableχ(t),the second derivative d^2χ(t)/dt^2 becomes *** gradient d χ(t)/d constantly increases as time *** is,the tangent vector on the curve changes from the lower right direction to the upper right direction as time *** the behavior occurring in the positive region of the variable χ(t)and the behavior occurring in the negative region of the variableχ(t)alternately occur in regular intervals,waves appear by these *** this paper,I present seven types of damped and divergence exact solutions by combining trigonometric functions,hyperbolic functions,hyperbolic leaf functions,leaf functions,and exponential *** each type,I show the derivation method and numerical examples,as well as describe the features of the waveform.

关键词： Leaf functions hyperbolic leaf functions lemniscate functions jacobi elliptic functions ordinary differential equations duffing equation nonlinear equations