result 13412 件
| JaLCDOI | 10.18926/fest/11622 |
|---|---|
| FullText URL | 001_121_133.pdf |
| Author | Maeno, Shiro| Yamamoto, Tetsuo| Nago, Hiroshi| |
| Abstract | In this paper the theoretical procedure to analyze the dynamic behavior of highly saturated sand bed around a cylindrical block under the cyclic loading of water pressure is developed. The fundamental equations were derived for the axially symmetric coordinates. Then, the finite element equations were developed to solve these fundamental equations numerically. Finally, the numerical method was verified by experiments. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 121 |
| End Page | 133 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313416 |
| JaLCDOI | 10.18926/fest/11619 |
|---|---|
| FullText URL | 001_115_119.pdf |
| Author | Takeshita, Yuji| Kono, Iichiro| |
| Abstract | The unsaturated soil hydraulic properties are essential data to predict the seepage behavior in the vadose zone. In this paper, a new experimental methodology of determining unsaturated soil hydraulic properties is proposed. The soil hydraulic properties are assumed to be represented by van Genuchten's closed-form expressions. Unknown parameters of this model are identified by using a optimization techniques. The optimization approach is nonlinear least-squares algorithm in corporating finite element analysis of one-dimensional nonsteady seepage flow. The advantages of the methods are in the possibility of identifying the optimal unsaturated soil hydraulic properties and diminishing experimental time. To evaluate availability of our proposed method, experimental results which are determined by proposed methods and conventional method are compared for decomposed granite soil. |
| Keywords | unsaturated hydraulic properties back analysis laboratory test groundwater |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 115 |
| End Page | 119 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313807 |
| JaLCDOI | 10.18926/fest/11615 |
|---|---|
| FullText URL | 001_077_089.pdf |
| Author | Okubo, Kenji| Morikawa, Hiroshi| Kimoto, Takashi| Tanaka, Yuji| |
| Abstract | Thermal 'staircase', a layer of constant temperature between the sheets of the steep gradients, was formed in the seasonal thermocline, which was 2.5 m above the bottom at a point of 18 m deep on the boundary slope in Lake Biwa. Following a sediment resuspension event when a moderate onshore wind blew, bed materials should be suspended up to the thermocline, then settled down forming a staircase above the turbid intrusion. Comparing the observed downward hear flux with the settling flux of sediment, it was found that double-diffusive convection would play an important role on the formation of the whole structure consisting of the staircase and turbid intrusion along with chemical anomalies and dense population of phytoplankters, which were fed by nutrients supplied from the bottom sediment under a typical condition of drought. Laboratory experiments were conducted to demonstrate the thermal and sediment processes in the stratified lake. Resuspension process due to surface and internal waves was examined using a tank with a sloping bottom, while the settling process was investigated by using a deep, diffusive tank. Formative process and scales of the staircase and intrusion were discussed relating with the intensity of resuspension and the buoyancy fluxes. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 77 |
| End Page | 89 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313571 |
| JaLCDOI | 10.18926/fest/11613 |
|---|---|
| FullText URL | 001_055_064.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We analyze some mathematical problems that arise in studies of phenomena observed in the cardiac action. We illustrate a method to characterize the response of a nonlinear oscillator to an external forcing, and introduce some numerical results. We also introduce some results of numerical computation in an example of a coupled system of an excitable system and a nonlinear oscillator. |
| Keywords | periodic forcing nonlinear oscillators excitable systems couples systems. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 55 |
| End Page | 64 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313699 |
| JaLCDOI | 10.18926/fest/11612 |
|---|---|
| FullText URL | 002_107_120.pdf |
| Author | Fujii, Hiroaki| Ofori Emmanuel| Shimada, Kiyoshi| Nishimura, Shin-ichi| |
| Abstract | This paper discusses a numerical model that can be used to optimize the installation in a zoned type and a homogeneous type fill dam. Before installation in a real dam to evaluate dam behavior, numerical model described in this paper is carried out on a prototype dam to check the optimum installation, using cross arm measurements. Three cross arm installations at the upstream, the core and downstream to measure displacements are considered. The installation options considered are three cross arm combinations for best installation to verify the safety of dams and to reduce cost. Finite element method is used for generating the displecement field in a linear elastic numerical model. The generated data is used as an input data in the back analysis to check the adequacy of each installation option. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 107 |
| End Page | 120 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313925 |
| JaLCDOI | 10.18926/fest/11611 |
|---|---|
| FullText URL | 001_065_076.pdf |
| Author | Kim, Hyun Bin| Tanaka, Yutaka| |
| Abstract | Partial least squares linear discriminant function (PLSD) as well as ordinary linear discriminant function (LDF) are used in pattern recognition analysis of writer identification based on are patterns extracted from the writings written with Hangul letters by 20 Koreans. Also a simulation study is performed using the Monte Carlo method to compare the performances of PLSD and LDF. PLSD showed remarkably better performance than LDF in the Monte Calro study and slightly better performance in the analysis of the real pattern recognition data. |
| Keywords | Writer identification Arc patterns Linear discriminant function Partial least squares |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 65 |
| End Page | 76 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002314147 |
| JaLCDOI | 10.18926/fest/11610 |
|---|---|
| FullText URL | 001_047_053.pdf |
| Author | Sasaki, Toru| Ishikawa, Hirofumi| Kajiwara, Tsuyoshi| Watanabe, Masaji| |
| Abstract | We treat the problem of water pollution by the method of a mathematical model. We illustrate the method of analysis with Kojima Lake. We analyze in-flow and out-flow of the lake, compute numerical solutions of the governing equations of the water flow and the pollutant. The simulation leads to the conclusion concerning the figure of Kojima Lake. |
| Keywords | Kojima lake Water analysis Finite element method |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 53 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313787 |
| JaLCDOI | 10.18926/fest/11608 |
|---|---|
| FullText URL | 001_043_046.pdf |
| Author | Kajiwara, Tsuyoshi| |
| Abstract | This paper contains some remarks supplementary to the previous paper [KW] concerning Hilbert C*-bimodules given from bundle constructions and a example given by this construction concerning the product type action on C*-algebras. |
| Keywords | Hilbert bimodule bundle tensor product |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 43 |
| End Page | 46 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313825 |
| JaLCDOI | 10.18926/fest/11607 |
|---|---|
| FullText URL | 002_089_098.pdf |
| Author | Hirose, Sohichi| |
| Abstract | A linear scattering inverse method based in the Kirchhoff approximation is formulated to determine the location and size of a crack in a solid. A characteristic function, which defines the size of a crack, can be reconstructed from the inverse Fourier transform of scattered amplitudes at far field. The inverse method is applied to ultrasonic data scattered by a crack in an aluminum specimen. Agreement between reconstructed characteristic functions and exact ones is not good enough, because experimental conditions do not coincide with theoretical ones. We can, however, evaluate the location and size of a crack from sharp minimum points reproduced at crack tips. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 89 |
| End Page | 98 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313621 |
| JaLCDOI | 10.18926/fest/11606 |
|---|---|
| FullText URL | 001_027_041.pdf |
| Author | Ishikawa, Hirofumi| |
| Abstract | The author has proved the dimension formula of the space of the Hilbert modular type cusp forms of weight two. We present further refinements of the dimension formula for a real quadratic number field Q(√D), and calculate it effectively. We tabulate the dimensions for square-free natural numbers D below 104 with the computer assistance. We also determine all the spaces of their dimension below 10. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 27 |
| End Page | 41 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313526 |
| JaLCDOI | 10.18926/fest/11605 |
|---|---|
| FullText URL | 002_079_088.pdf |
| Author | Taniguchi, Takeo| |
| Abstract | CAD system is useful to define and input any artificial 3-dimensional configuration into computer, but the input of arbitrary natural 3-dimensional configuration is still serious for computer users. This paper includes a method to input arbitrary 3-dimensional configuration into computer. The method is based on 3-dimensioanl Delaunay triangulation which is a geometrical subdivision of arbitrary 3-dimensional convex domain into tetrahedra, and the auther shows a method to find triangles which cover whole surface of 3-dimensional body using the result of Delaunay triangulation. |
| Keywords | Delaunay Triangulation 3D Configuration TIN CAD Computational Geometry |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 79 |
| End Page | 88 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313817 |
| JaLCDOI | 10.18926/fest/11604 |
|---|---|
| FullText URL | 001_021_026.pdf |
| Author | Hora, Akihito| |
| Abstract | Let G be a topological group acting on S transitively from the left with a compact stabilizer K. We show that every isotropic (i.e. spatially homogeneous w.r.t. the G-actions) Markov chain on S can be lifted to a right random walk on G and give a one-to-one correspondence between the isotropic Markov chains on S and the totality of sequences of probabilities (ν,μ1,μ2,･･･) where ν is a probability on G/K and each μn is that on K＼G/K. |
| Keywords | random walk Markov chain |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 21 |
| End Page | 26 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313549 |
| JaLCDOI | 10.18926/fest/11602 |
|---|---|
| FullText URL | 001_015_020.pdf |
| Author | Nakajima, Atsushi| |
| Abstract | Let A be a bialgebra and let S be a right A-comodule algebra which has an A-comodule subalgebra T with common identity. We show that if S is a separable extension of T, then for a left A-module algebra K, K♯S is a separable extension of K♯T. Similar result holds for left A-module algebras and right A-comodule algebras. |
| Keywords | Separable extension smash product module algebra and comodule algebra |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 15 |
| End Page | 20 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313954 |
| JaLCDOI | 10.18926/fest/11601 |
|---|---|
| FullText URL | 001_001_013.pdf |
| Author | Morimoto, Masaharu| Yanagihara, Mamoru| |
| Abstract | In transformation groups on manifolds, it has been an interesting problem to ask whether for a given finite group G, there exists a real G-module V such that dim VP >2dimV>P for all subgroups P of prime power order and such that VH=0 for certain large subgroups H of G. This paper provides GAP programs to show that S5 does not admit such a real S5-module V. |
| Keywords | GAP fixed point gap condition |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1996-03 |
| Volume | volume1 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 13 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313410 |
| JaLCDOI | 10.18926/fest/11599 |
|---|---|
| FullText URL | 002_051_058.pdf |
| Author | Kishida, Takumi| Watanabe, Keiichiro| Ohtaki, Eiji| |
| Abstract | The Measuring instrument of carbon dioxide concentration in seawater (pCO(2)) is developed. The instrument consists of an equilibrator, a non-dispersive infrared gas analyzer (NDIR), a carrier gas generator and a processing signal generator. The equilibrator has a cross section of 3 c㎡ and is 15 cm tall. The principle of pCO(2) measurement is based on the equilibration of a carrier gas phase with a seawater sample and subsequent determination of the carbon dioxide concentration in the carrier gas. The carrier gas circuit of the NDIR is opened to the atmosphere to maintain the carrier gas line at a barometric pressure. The present instrument can measure pCO(2) within the measuring error of about 2 ppm with sample water of about 180ml every 20 min. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 51 |
| End Page | 58 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313348 |
| JaLCDOI | 10.18926/fest/11598 |
|---|---|
| FullText URL | 002_025_032.pdf |
| Author | Nishigaki, Makoto| Schreck Martin| |
| Abstract | Engineers have long sought the possibility of measuring parameters such as temperature and pressure continuously in the underground with high precision, high spatial resolution and high band width of parameters. Distributed fibre optic measurement offers the use of a very fast, robust, precise, light and small gauges with an high spatial resolution. In this paper we would like to compile fibre-optic measure-methods which are available now for projects in geohydraulical engineering. This paper will propose new problems for future research work on parameter identification for such parameters as conductivity and anisotropy. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 25 |
| End Page | 32 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313718 |
| JaLCDOI | 10.18926/fest/11596 |
|---|---|
| FullText URL | 002_019_024.pdf |
| Author | Watanabe, Masaji| |
| Abstract | We study a system obtained by coupling a nonlinear oscillator and a stationary system. We analyze the dynamics in a singular limit and show that asymptotically orbitally stable periodic solutions can exist. We also show how a slow oscillation can arise in the coupled system. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 24 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313835 |
| JaLCDOI | 10.18926/fest/11595 |
|---|---|
| FullText URL | 002_009_017.pdf |
| Author | Ishikawa, Hirofumi| |
| Abstract | In this paper, we have calculated the elliptic singularities of the symmetric Hilbert modular group defined over a real quadratic number field. Applying those to the dimension formula, we tabulate the dimensions of the space of symmetric Hilbert modular forms of weight two satisfying certain cusp condition. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 9 |
| End Page | 17 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313960 |
| JaLCDOI | 10.18926/fest/11594 |
|---|---|
| FullText URL | 005_153_158.pdf |
| Author | Ye, Xuan| Hayashi, Nobuyuki| Tsuboi, Sadao| |
| Abstract | This paper describes a novel synthesis of trienes by treatment of trans-2-alkenyl triphenylphosphonium bromides with BuLi in THF solution. Compounds, 5,7,9-tetradecatriene, 1,6-diphenyl-1,3,5-hexatriene, and 2,6,11,16-tetramethyl-2,6,8,10,14-hexadecapentaene were prepared in the yields of 40%, 9%, and 46%, respectively. Cross-coupling of trans-2-heptenyltriphenylphosphonium bromide and trans-3-phenyl-2-propenyltriphenylphosphonium bromide gave a mixture of 5,7,9-tetradecatriene (10.6%), 1,6-diphenyl-1,3,5-hexatriene (0.5%), and 1-phenyl-1,3,5-decatriene (9.4%). |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 2000-02-29 |
| Volume | volume5 |
| Issue | issue1 |
| Start Page | 153 |
| End Page | 158 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313618 |
| JaLCDOI | 10.18926/fest/11593 |
|---|---|
| FullText URL | 002_001_008.pdf |
| Author | Hora, Akihito| |
| Abstract | An aspect of the cut-off phenomenon is reviewed. It is a sort of critical phenomenon observed in a wide variety of diffusion. We introduce a framework in which such a phenomenon can be understood and analyzed in a rigorous manner. We illustrate the mechanism with some concrete models. |
| Keywords | cut-off phenomenon critical time diffusion Markov chain on a graph symmetry |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1997-01-10 |
| Volume | volume2 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 8 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002313764 |
