result 989 件
| JaLCDOI | 10.18926/19954 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_7.pdf |
| Author | Maetani Noriaki| Kurose Tomoyuki| Tsuruta, Kenji| |
| Abstract | The lens effect of acoustic waves in a two-dimensional (2D) phononic crystal is studied by numerical simulation based on the finite-difference time-domain (FDTD) method. We calculate the phonon band structure of 2D phononic crystals, consisting of metal cylinders placed periodically in water. Lens effect is observed by the negative refraction of acoustic waves, which results in refocusing of the waves at the point outside the crystal. To increase the focal intensity, we introduce a 2D phononic crystal shield with a different composition of material, which returns the incident waves back to the lens via the perfect reflection. Also, the dependence on filling fraction of metal in the crystal is studied. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 7 |
| End Page | 12 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309019 |
| JaLCDOI | 10.18926/19953 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_44_1.pdf |
| Author | Nagai Shinji| Umeda Ryosuke| Tsuruta, Kenji| |
| Abstract | In this paper, we investigate a light-confinement phenomenon in the structure which has triangular latice composed of Double NeGative Metamaterial (DNGM). In geometrical optics consideration, this structure is expected to confine lights completely by sequential refractions in the structure. We demonstrate it by using the two dimensional finite-difference time-domain simulations. We introduce Drude-Lorentz model for dielectric and magnetic dispersion of the material at optical frequencies. We analyze quantitatively the effects of energy loss in the DNGM on the light-confinement efficiency. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 2010-01 |
| Volume | volume44 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 1349-6115 |
| language | English |
| File Version | publisher |
| NAID | 120002309117 |
| JaLCDOI | 10.18926/fest/19746 |
|---|---|
| FullText URL | 004_175_181.pdf |
| Author | Chamel Jean-Luc| |
| Abstract | What is the meanig of the first sentence, and then the meaning of the full stop? This essay tries to give an answer from a literaly, soial and metaphysical point of view. |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 175 |
| End Page | 181 |
| ISSN | 1341-9099 |
| language | French |
| File Version | publisher |
| NAID | 120002309127 |
| JaLCDOI | 10.18926/fest/19744 |
|---|---|
| Title Alternative | Manufacture Industry in the Tokugawa Period |
| FullText URL | 004_159_174.pdf |
| Author | Tonomura, Naohiko| |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 159 |
| End Page | 174 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002309107 |
| JaLCDOI | 10.18926/fest/19742 |
|---|---|
| FullText URL | 004_147_158.pdf |
| Author | Chen, Danping| Watanabe, Tomohiro| Miura, Yoshinari| Nanba, Tokuro| |
| Abstract | Photo-induced phenomena such as photoconductive and photovoltaic effects were investigated for the glasses in CdO-Bi(2)O(3)-Al(2)O(3) system. Photoconductive effect was characterized by a slow decay of photocurrent (persitent photoconductivity). The decay rate decreased with increasing CdO content and decreasing Bi(2)O(3) content. Photovoltage was very small at room temperature but increased to an obvious value on heating. The photoconductivity and photovoltage were increased with CdO content and enhanced by heat treatment in air. The valence band spectra of X-ray photoelectron spectroscopy showed that the hybridization of Cd 4d and O 2p orbitals increases with decreasing Bi(2)O(3) content and increasing CdO content in the glasses. As the results maximum tends to flat. This type of band structure inhibits the rapid recombination of electrons and holes. The persistent photoconductivity of the glasses may be attributed to deep energy level of DX centers. Deep energy levels of the glasses are able to prevent the recombination because they have a repulsive barrier for both electron emission and capture. |
| Keywords | Photoconductivity Photovoltage Persistent photoconductivity CdO-Bi(2)O(3)-Al(2)O(3) glasses Electronic state |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 147 |
| End Page | 158 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309190 |
| JaLCDOI | 10.18926/fest/19737 |
|---|---|
| FullText URL | 004_131_145.pdf |
| Author | Kamboh Maqsood Ahmed| Oki, Yoko| Adachi, Tadashi| Narioka, Hajime| |
| Abstract | A pot experiment was conducted to study the relative performance of IR 6,KS 282 and IR 10198-66-2 rice varieties cultivated under salt-affected conditions at EC of 6.0,9.0 12.0 dS m(-1) in a sandy clay loam soil havig ECe of 1.6 dS m(-1) treated as control. Six seedlings of 39-day old transplaned to each pot having 12 kg soil. The fertilizer as nitrophos and potassium sulphate at the rate of 57.0, 25.0 and 50.0 mg N,P and K kg(-1) soil respectively was applied at the time of transplanting while zinc sulphate at the rate of 5 mg Zn kg(-1) soil and 43.0 mg N kg(-1) of soil as additional dose were applied 19 and 30 days after transplanting respectively. Normal plant protection measures like number of tillers, panicles, paddy grains, filled and unifilled grains, yield per plant and sterility were recorded and shoot and straw samples were analysed for sodium, potassium, calcium and chloride contents. It was observed that growth and yield of all the varieties were reduced significantly with increasing soil salinity. Na/K and Na/Ca rations in shoot and straw increased significantly with increasing soil salinity. It was also observed that higher values of Na/K and Na/Ca rations in shoots affected growth parameters while higher values of these rations in straw affected yield components and grain yield. However, IR 6 having relatively lower values of Na/K and Na/Ca rations proved to be the most salt-tolerant rice among the three varieties studied. |
| Keywords | soil salinity growth and yield mineral compasition rice varieties |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 131 |
| End Page | 145 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309142 |
| JaLCDOI | 10.18926/fest/19734 |
|---|---|
| FullText URL | 004_119_130.pdf |
| Author | Moustafa Mahmoud Mohamed| Yomota, Atsushi| |
| Abstract | Theoretical drainage equations are intensively tested in many parts of humid and arid regions and are commonly used in drainage design. However, this is still a great concern in Japan as the drainage design is exclusively based on local experiences and empirical basis. There is a need therefore to evaluate the theoretical drainage equations under Japanese field conditions to recommend equations for design of subsurface drainage systems. This was the main motivation for this study. While drainage requirements of different crops are difficult to define quantiatively, adequate drainage can probably be provided by designing for a given water table recession rate. The method used was to measure the rate of water table recession and drain outflow after cessation of a considerable amount of rainfall. Based on these measurements, soil parameters were determined and nine drainage equations were tested in simulating water table recession against actual field data of two drained experimental sites, located in Soja city west of Okayama prefecture, Japan, having drain spacing of 10 and 8.5 m for a period of two years. An experimental drainage equation was also derived and theoretical equations were recommended for design of subsurface drainage systems. |
| Keywords | Simulation Soil parameters Subsurface drainage Water table |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 119 |
| End Page | 130 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002308991 |
| JaLCDOI | 10.18926/fest/19732 |
|---|---|
| Title Alternative | Environmental Symbiosis in Urban ane Regional Infrastructure Improvement -Some Examples in Okayama Region |
| FullText URL | 004_101_118.pdf |
| Author | Inouye, Hiroshi| |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 101 |
| End Page | 118 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002309200 |
| JaLCDOI | 10.18926/fest/19729 |
|---|---|
| FullText URL | 004_093_100..pdf |
| Author | Nago, Hiroshi| Mia Faruque| |
| Abstract | Major failure of structures usually occurs during flood flows due to scourin, sinking and sliding. These types of failure are considered to be in close relation to the dynamic behavior of bed material around the structures. Failure of bridges due to the phenomenon of scouring around piers is a common, natural problem of river hydraulics. Experiments were carried out to investigate the characteristics of pore water pressure and effective stresses in the bed material around a circular bridge pier under abrupt change of water pressure. A laboratory model was used to clarify the effect of the variation of water pressure to determine the mechanism of the collapse of circular bridge pier during flood or storm waves. The experimental results showed that the bed material under suddeen change in drop of water pressure near the pier was weakenend by an increase in excess pore pressure, followed by a considerable quick removal of bed material. |
| Keywords | Pore pressure Effective stress Abrupt water pressure change Scour Bridge pier |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 93 |
| End Page | 100 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309116 |
| JaLCDOI | 10.18926/fest/19726 |
|---|---|
| FullText URL | 004_081_092.pdf |
| Author | Kohno, Ichiro| Takeshita, Yuji| Mohammad Jafar Ali| |
| Abstract | For reducing or bridging gap between small scale laboratory investigations and large scale field investigations, a simple and portable model which is based on real situation and has a compatibility to laboratory core sampling, the pressure infiltrometer technique is introduced for determination of field-saturated hydraulic conductivity. The field -saturated hydraulic conductivity, K(FS), is obtained from measurements of steady flow rates applying constant head as well as falling head principle. The device is also used for field core sampling on which laboratory constant head as well as falling head tests is carried out. The field device is validated through comparison to laboratory core sample experiment and other existing methods. This paper describes first time a versatile field device representing good performance for in situ determination of hydraulic parameters in a short time. |
| Keywords | In-situ test Field-saturated Hydraulic conductivity Matric flux potential Wetting front 3D-flow |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 81 |
| End Page | 92 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309012 |
| JaLCDOI | 10.18926/fest/19724 |
|---|---|
| FullText URL | 004_077_080.pdf |
| Author | Kajiwara, Tsuyoshi| |
| Abstract | In this paper, we contruct Hilbert C* -bimodules for continuous graphs whose vertexes are countable 1-dimensiona tori, and show some uniquness property of the C* -representatiion of these bimodules. |
| Keywords | Hilbert bimodule C* -algebras continous graph |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 77 |
| End Page | 80 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309008 |
| JaLCDOI | 10.18926/fest/19719 |
|---|---|
| FullText URL | 004_057_075.pdf |
| Author | Otake, Masanori| Tanaka, Yutaka| Tomita, Makoto| |
| Abstract | An analytic approach that provides explicit estimates of risk on cataract and epilation data is evaluated by reasonableness of conceivable relative risk models regarding a simple, odds, logistic or Gompertz regression method, assuming a binomial distribution. In these analyses, we apply relative risk models with two thresholds between epilators and nonepilators from a highly characteristic lesion of which radiation cataract does not occur around 2 gray for a single acute exposure. The risk models are fitted to the data assuming 10 as a constant relative biological effectiveness of neutron. The likelihood of observing the entire data set in these models fitted is evaluated by an individual binary-response array. Estimation of a threshold with or without severe epilation and the 100(1-α )% confidence limits are derived from the maximum likelihood approach. The relative risk model with two thresholds can be expressed as a formula with structure of Backgroun × RR, where RR includes threshold models with or without epilation. The radiosensitivity of ionizing radiation to cataracts has been examined for the relationship between epilators and nonepilators. |
| Keywords | radiation cataract threshold model profile approach risk model radiosensitivity |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 57 |
| End Page | 75 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309188 |
| JaLCDOI | 10.18926/fest/19714 |
|---|---|
| FullText URL | 004_037_055.pdf |
| Author | Choi, Seung Bae| Tanaka, Yutaka| |
| Abstract | One of major problems in spatial analysis is to estimate the value z(s(0)) at an unknown location s(0) using the information about observations z(s(α)), α = 1,…,n. In this article, we will perform a numerical study about some methods for this problem. That is, we examine both the tranditional statistical method which does not take into account spatial correlation and the spatial statistical method which takes into account spatial correlation by applying them to a set of non-stationary spatial data. We compare the predictive powers of these methods. More precisely, we choose Universal Kriging(UK) and Median-Polish Kriging(MPK) as spatial statistical methods, and locally weighted regression or LOESS as a traditional method. As the major criterion for comparison, we use the so-called PRESS statistic, and also draw the prediction surface plot and the prediction standard error surface plot as minor criteria. A real numerical example of non-stantionary spatial data is analyzed for the comparison among the above three methods. |
| Keywords | Stationary Variogram UK MPK LOESS |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 37 |
| End Page | 55 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309080 |
| JaLCDOI | 10.18926/fest/19712 |
|---|---|
| Title Alternative | Assessment of Local Influence in Statistical Modelling with Equality Constraints |
| FullText URL | 004_019_035.pdf |
| Author | Zhang, Fanghong| Mori, Yuichi| Tanaka, Yutaka| |
| Keywords | Cook's local influence equality constraints principal component analysis subsets of parameters |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 19 |
| End Page | 35 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002309028 |
| JaLCDOI | 10.18926/fest/19708 |
|---|---|
| Title Alternative | Swap-Rate of Entrance Examination and Its Software -SRAS- |
| FullText URL | 004_007_018.pdf |
| Author | Tarumi, Tomoyuki| Yamamoto, Yoshiro| |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 7 |
| End Page | 18 |
| ISSN | 1341-9099 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002309160 |
| JaLCDOI | 10.18926/fest/19695 |
|---|---|
| FullText URL | 004_001_006.pdf |
| Author | Watanabe, Masaji| |
| Abstract | According ot previous studies, we may expect that slow oscillations can occur in dynamics of a parameterized family of systems in which a biochemical oscillator is coupled to a stationary systems. We introduce some numerical results that confirm our expectation. The results suggest that it is possible for slow oscillations to occur in dynamics of a system in which an active oscillatory unit is coupled to a passive medium, and that it is possible for circadian oscillations to arise from fast glycolytic oscillations in such a coupled system. |
| Keywords | circadian rhythm glycolytic oscillation nonlinear oscillator |
| Publication Title | 岡山大学環境理工学部研究報告 |
| Published Date | 1999-02-26 |
| Volume | volume4 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 6 |
| ISSN | 1341-9099 |
| language | English |
| File Version | publisher |
| NAID | 120002309099 |
| JaLCDOI | 10.18926/19692 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_33_2_111.pdf |
| Author | Fujihara Yutaka| Munesawa, Yoshiomi| Osaki, Hirokazu| |
| Abstract | Our country faces a serious problem of the environmental pollution by the production and the large quantity consumption of the industry product. The thoroughness of resources recycling has become necessary to solve these problems. As for the product design and the production control, how productivity should be improved has been discussed with extreme emphasis. But from now, as for the product design, both assemblability and disassemblability must be taken into consideration at the same time. And also in production management, it must be investigated how the products can be recycled in the low cost. Therfore, the facility layout method with two phases in recycling plant, which is composed of both the procedure for the layout of facility group and the procedure for the layout of intermal facility group by the optimal solution method and the suboptimal solution method by neural network is proposed in this paper. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1999-04-27 |
| Volume | volume33 |
| Issue | issue2 |
| Start Page | 111 |
| End Page | 119 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002309035 |
| JaLCDOI | 10.18926/19689 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_33_2_105.pdf |
| Author | Tokunaga Shuichi| Osaki, Hirokazu| |
| Abstract | This paper deals with analytical method of human motion by image processing to make a model of the scooping process, Firstly, the scooping tool is the spoon, and while the scooping process is performing, the movement of the mouth center position and the spoon top position are measured by two cameras. As the amount of substance is over the uppermost area of the cup, the spoon is stuck obliquely into substance. Then the spoon is rotated and lifted up to the mouth. Secondly, we recognize the mouth center from the characteristic of the face image data and calculate the spoon top position to extract two points on the spoon handle from the time series images by two cameras. Finally, we describe the method of recognizing the coordinate of the mouth center and estimating the coordinate of the spoon top to analyse the scooping process. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1999-04-27 |
| Volume | volume33 |
| Issue | issue2 |
| Start Page | 105 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002309175 |
| JaLCDOI | 10.18926/19684 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_21_2_47.pdf |
| Author | Taniguchi, Takeo| Tsurumi Yasuo| |
| Abstract | The aim of this paper is to propose new automatic mesh generator for the finite element analysis of threedimensional structures consisted of plates and beams. The strategy of the proposed one is as followings; Firstly, subdivide the structure into two-dimensional and one-dimensional structural components. Secondly, generate mesh pattern for each of them, and finally combine them so that they reconstruct the original configuration. By using the proposed method the modeling of, for example, steel bridge structures for Finite Element Analysis is easily and also fastly completed. Some examples of the application of the proposed method are presented, and from the examination of the results further important informations for the design of better method are also given in this paper. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1987-03-05 |
| Volume | volume21 |
| Issue | issue2 |
| Start Page | 47 |
| End Page | 63 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002309157 |
| JaLCDOI | 10.18926/19682 |
|---|---|
| FullText URL | Mem_Fac_Eng_OU_33_2_91.pdf |
| Author | Munesawa, Yoshiomi| Osaki, Hirokazu| Kajihara, Yasuhiro| |
| Abstract | In this paper, we propose the method to determine the position of the 2 cameras for the multiviewpoints as the robot is the work place. The optical axit's direction of the 1st camera is determined in the base ot work contents in teleoperation. The multiviewpoints system uses the 2 camera units that aren't installed side by side, so that the direction of the 2nd camera is decided in the base of the angle between the optical axes' direction of 2 cameras. Next, the distance from the camera to the work place is determined according to the distance resolution of image on the monitor, and the camera type of which the point-blank range is not this distance is selected. And the efficacy ot this system is examined with an experiment. |
| Publication Title | Memoirs of the Faculty of Engineering, Okayama University |
| Published Date | 1999-04-27 |
| Volume | volume33 |
| Issue | issue2 |
| Start Page | 91 |
| End Page | 96 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002309052 |
