result 47530 件
| JaLCDOI | 10.18926/15761 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_79.pdf |
| Author | Morikawa, Yoshitaka| Hamada, Hiroshi| |
| Abstract | Two variational formulations for electromagnetic field and charged-particle stream configurations, in which both field and particles are described by the field-like variables suited for the problems of electrodynamics, are presented. One of them is directly obtained through slight modifications of Sturrock's original procedure but has a complicated form. The other is obtained through linearization of the preceding one and has a compact form. Both formulations lend themselves to straightforward derivation of the well-known energy-momentum tensor and/or its conservation law. Specifically the latter one is of academic interest because of its compact form. Moreover, as a proof of its practical usefulness the variational principle under the small-amplitude approximation is derived from it, which is known to provide a basis for the study of certain types of instability in plasmas. It is, however, hoped that it will find main applications in the electrodynamics problems concerned with large-amplitude behavior. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 79 |
| End Page | 100 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307937 |
| Author | 小山 かおる| 野久保 隆| 三島 愛架| Kishida, Yoshirou| 富山 雅光| Oikawa, Takuro| |
|---|---|
| Published Date | 2009-04-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume31 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/15759 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_61.pdf |
| Author | Furutani Yoichiro| Deutsch Claude| Gombert Marie M.| Oda Yoshinori| |
| Abstract | Within the framework of the hydrodynamic guidingcenter approximation, we have investigated such quantum effects as the diffraction correction and the symmetry effect on the classical version of the particle diffusion coefficient D(1) across a dc magnetic field through the temperature-dependent pseudo-potentials. Analytic results are explicitly given with recourse to the order-of-magnitude estimate of a set of parameters pertaining to a laser-driven plasma. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 78 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307432 |
| Author | Saitou, Kuniyuki| 多田 正人| 沼野 義和| 小林 恭子| Sen Trinh Thi| |
|---|---|
| Published Date | 2009-04-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume31 |
| Content Type | Departmental Bulletin Paper |
| Author | 松本 幸実| 野久保 隆| 稲井 文代| Kishida, Yoshirou| 富山 雅光| Oikawa, Takuro| |
|---|---|
| Published Date | 2008-04-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume30 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/15756 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_47.pdf |
| Author | Koga, Ryuji| Nagase, Satoru| Kosaka, Megumi| Sano, Hiroya| |
| Abstract | Basic prohlems are discussed about a local, realtime and very sensitive air-pollution monitoring using a laser diode. The method employs the second derivative spectrometry replacing the incoherent light source and mechanical choppers in a traditional method with the laser diode and a newly developed electronic system. Etalon fringes at this system becomes the dominant noise source and its statistic and dynamical features are to be understood. Numerical examination was done for the optimal width of optical frequency modulation. A very fast measurement of weak absorption spectra became possible by the development of lock-in-amplifiers with finite integration time instead of a low-pass filter. Spectra of methane in 7.6 μm region and a time-dependent spectrum of the etaIon fringe are shown. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 47 |
| End Page | 60 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307627 |
| Author | 松本 幸実| 野久保 隆| 稲井 文代| Kishida, Yoshirou| 富山 雅光| Oikawa, Takuro| |
|---|---|
| Published Date | 2007-12-01 |
| Publication Title | 岡山大学農学部センター報告 |
| Volume | volume29 |
| Content Type | Departmental Bulletin Paper |
| JaLCDOI | 10.18926/15754 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_29.pdf |
| Author | Okamoto Takuji| |
| Abstract | In this paper, a hardware design of digital systems with remote-diagnostic capability is presented. We consider a method for testing a system T(l) on a module basis with a remotely installed systems T(2). In the testing mode, we set up a system (T(l)-m,m') such that a module m of T(l) is replaced by an adapter A(1) connected to other adapter A(2) through a telephone line and the corresponding module m' of T(2) is connected to A(2). If the system (T(l)-m,m') can simulate T(1) in the absence of any faluts, then it can test m' under a self test program. The main subject of this paper is to study the conditions of the system to be testable in the above sense. At first, the remote diagnostic network based on the system in this paper, restrictions to the system configuration required to perform such a diagnosis and the operation of the diagnostic system are described. The second, the module structure to make above simulation possible is considered, representing the system configuration graphically. Finally, an example of the adapter is shown and the time consumed to diagnose is discussed. One of our results is that a sufficiently large class of synchronous digital systems with few minor conventions is testable. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 29 |
| End Page | 45 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307349 |
| JaLCDOI | 10.18926/15753 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_17.pdf |
| Author | Yamamoto Yoshitake| Yamamoto Tatsuma| |
| Abstract | In the case of non-invasive measurement of bioelectric potential from body surface, the influence of the skin impedance has been investigated by using strict equivalent circuits of skin impedances. The relationship between the characteristic of skin impedance and the wave distortion was made clear. Furthermore, in the case of electrocardiograph, the shift potential of indifferent electrode to standard potential was obtained by means of simulation, and the distortions caused by connective resistances of a central terminal and skin impedance were quantitatively explained. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 17 |
| End Page | 28 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307780 |
| JaLCDOI | 10.18926/15752 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_119.pdf |
| Author | Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Toshio| Takahashi Teruo| |
| Abstract | A new method based on the principle of flow injection analysis is presented for the semiautomated determination of chemical oxygen demand (COD) in environmental water samples. The method is rapid and continuous, and suitable for the monitoring of COD in wastewaters. The apparatus used was simply constructed by parts commercially available for high performance liquid chromatography. Teflon tubing heated with a boiling water was used as a reactor and simultaneously used for mixing coils and transmission lines. The operating conditions were examined to apply the determination of COD in wastewaters by using glucose as a standard COD substance. The procedures recommended are as follows: Both 4.9x10(-4) M potassium permanganate and 6.7 % sulfuric acid solutions are individually pumped, 20 μl of a sample solution is injected into the flow of the sulfuric acid solution, and then mixed with a mixing joint. The mixed solution is transported to a flow cell situated in a spectrophotometer fixed at a wavelength of 525 nm, and decrements of absorbance are recorded. The peaks were reproducibly obtained at a concentration range of 10 - 200 mg-COD 1(-1). Chloride up to 1000 mg 1(-1) was not interfered at all. Various wastewater samples were analyzed by the proposed method at a sampling rate of 30 samples per hour, and the apparent COD values obtained were compared with the manual COD ones obtained by JIS method. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 119 |
| End Page | 129 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307775 |
| JaLCDOI | 10.18926/15751 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_15_1_1.pdf |
| Author | Nakajima, Toshikatsu| Uno, Yoshiyuki| |
| Abstract | Grinding force has a close relation to grinding inputs such as grinding wheel, work material, interference condition, grinding speed, grinding fluid and machine condition, and therefore varies widely with grinding inputs. On the other hand, grinding force affects significantly grinding outputs which are efficiency and quality evaluated with surface roughness, accuracy, surface integrity and so on. It is important to make clear the relations between grinding inputs and grinding force in order to control grinding outputs. In this paper, from the above point of view, the relations between grinding inputs and grinding force are experimentally investigated. It is pointed out that the normal grinding force, the tangential grinding force and its ratio are determined by the product of speed ratio of work speed to wheel speed and setting depth of cut as for interference conditions, and by the product of square of dressing feed and cutting depth of. dresser as for dressing conditions. Furthermore as for characteristics of work materials, the normal grinding force has a close relation to the yield stress, and the force ratio is related to the elongation of work material. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-11-29 |
| Volume | volume15 |
| Issue | issue1 |
| Start Page | 1 |
| End Page | 16 |
| ISSN | 0475-0071 |
| language | Japanese |
| File Version | publisher |
| NAID | 120002307960 |
| JaLCDOI | 10.18926/15750 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_111.pdf |
| Author | Kanamaru Fumikazu| Oda Kiichi| Miyazaki Susumu| Yoshio Tetsuo| Takahashi Katsuaki| |
| Abstract | The amorphous Fe(100-x)B(x) alloys with 18 ≤ x ≤ 42 were prepared by applying a rf-sputtering technique. The chemical composition of the sputtered films was well controlled by varying the area ratio of B plate to Fe plate, which were used as a composite target. The crystallization temperature of the amorphous films linearly rises with increasing of B content up to x = 36, but falls in a composition range of 36 ≤ x ≤ 42. The amorphous Fe(100-x)B(x) films exhibited ferromagnetism in the whole compositions studied in the present work. The internal magnetic field of the amorphous films decreases with increasing of B content, since the charge transfer increases with B atom in the system Fe(100-x)B(x). |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 111 |
| End Page | 118 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307228 |
| JaLCDOI | 10.18926/15749 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_73.pdf |
| Author | Kono Iichiro| Nishigaki Makoto| |
| Abstract | This paper deals with the experimental study of hydraulic properties of unsaturated soil. In treating unsaturated zone, a great deal more data are required than are required for the saturated zone, but these properties of soils must be known to apply the finite element approach to actual groundwater flow problems. The purposes of this paper are to propose a rational basis of getting experimental relationships between prossure head() and hydraulic conductivity(K) and between pressure head() and volumetric moisture content(θ) with "the instantaneous profile method" in a laboratory. An apparatus was constructed and test procedures were developed to measure pressure head and volumetric moisture content by using pressure transducers and low-energy gamma ray attenuation. The technique of a low-energy gamma radiation apparatus does provide a means for accurate measurement of water content without disturbing the system into which water is moving. Furthermore rapid measurement of water content becomes possible at any position in a soil so that water content changes with time may easily be followed. The tensiometer~transducer system provides a most valuable means of measuring pressure head with rapid response and with provision of a complete record of the pressure head changes with time. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 73 |
| End Page | 110 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307379 |
| JaLCDOI | 10.18926/15748 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_53.pdf |
| Author | Nishigaki Makoto| Kono Iichiro| |
| Abstract | The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone, and to present the fundamentals of the theory of groundwater flow. This paper discusses the physics of the saturated-unsaturated groundwater motion. Evaluations confirm the early belief that Darcy's law is of the nature of statistical result giving the empirical equivalent of Navier-Stokes equations. The governing equation of saturated-unsaturated flow in porous media is derived from the law of mass conservation and from the Darcy's law and Richard's equation of motion and is compared with the Klute's diffusion equation which has been widely used in the analysis of unsaturated flow. As a result; it is concluded that the governing equation has the advantage that can be applied for the whole flow region. Typical boundary conditions are enumerated. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 53 |
| End Page | 72 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307170 |
| JaLCDOI | 10.18926/15747 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_139.pdf |
| Author | Kawara Osami| |
| Abstract | In this paper, ozonation of organic substances which are found in wastewater is discussed regarding following respects; (1)removal ratios of COD(Cr) and TOC, (2)removal properties, and (3)oxidation products. The main results are summarized as follows. (l)Ozonation quickly removes proteins and amino acids, but mildly polysaccharides and n-saturated carboxylic acids. (2)The initial removal of COD(Cr) or TOC is quite rapid, but, as the reaction continues, it slows down so drasti-cally that one may suspect that it has completed. (3)Starch and albumine are decomposed to the smaller molecular compounds. (4)The COD(Cr) /TOC ratio of each substance which is chosen in this study decreases. This means that ozonation results in the formation of oxygenated fragments of the original molecule-occurs by bond fission or partial oxidation. (5)Proteins are indispensable components in frothing because they are surface active. They are removed by not only oxidation but also foaming, however, the removal by foaming is not so large. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 139 |
| End Page | 150 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307712 |
| JaLCDOI | 10.18926/15746 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_127.pdf |
| Author | Nago Hiroshi| Furukawa Syuzo| |
| Abstract | In this paper the discharge coefficient of a sluice gate placed at the sudden expansion of an open channel is investigated theoretically and experimentally. Lateral and vertical expansions are treated in the study. The coefficients obtained for channels with sudden expansion are compared with those for the straight channel. For free efflux, experimental results show that the coeffcients for expanded channels are always larger than those for a straiaht one,and that the coefficient for a channel to be fully expanded to both lateral and vertical directions takes about 1.2 times larger value than that for a straight one. For submerged efflux, the coefficient is obtained theoretically by using the efflux model shown in this study. The theoretical results explain the experimental ones fairly well. The coefficient for lateral expansion is always smaller than that for a straight channel. The minimum downstream water depth required to submerged efflux for the expanded channels becomes smaller than that for a straight channel. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 127 |
| End Page | 138 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307258 |
| JaLCDOI | 10.18926/15745 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_33.pdf |
| Author | Kaneda Masahiro| |
| Abstract | Algorithms for system identification applying throughout Fast Fourier Transform (FFT) to the major calculating operations are introduced. It is shown that by using data of about as twice length as system settling time and by truncating the incorrect correlation functions resulting from them, errors owing to finiteness of data can be avoided. It is shown that so as to suppress the effects owing to statistical fluctuation of input data or output noise, superposition of data in frequency domain is effective, and also the damping terms of poles or zeros can be efficiently evaluated by utilizing the phase change of the spectra of the impulse response sequence. The proposed method can be efficiently applied to relatively higher order systems or relatively rapidly time-variant systems because of high accuracy and high speed processing of FFT. Moreover, it needs not to assume the order of the system a priori, and yields a reasonable lower order approximating system in itself. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 33 |
| End Page | 51 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307376 |
| JaLCDOI | 10.18926/15744 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_95.pdf |
| Author | Nishigaki Makoto| Kono Iichiro| |
| Abstract | In order to apply the numerical method to practical groundwater flow problem in the field, the hydraulic properties must be estimated. In this paper, new methods of analyzing drawdown tests were developed and illustrated with some examples to determine hydraulic properties of aquifer. Drawdown tests sometimes have to be performed near the boundary of the aquifer or in the much groundwater supplied aquifer. In such instances, the assumption that the aquifer is of infinite areal extent is no longer valid. Therefore the analytical solutions of unsteady flow due to drawdown test are derived in the conception of "Island Model" that the shape of groundwater level is fixed by the circular water supply which is equilibrium with the pumping rate. By using these solutions, new methods of analyzing drawdown tests which are performed in a confined aquifer and an unconfined aquifer were given respectively and the effect of influence region was evaluated. The example analysis to determine permeability and storage coefficient were shown. As the results,the propriety of the solutions is verified comparing the analytical results with the drawdown test data taken from a real aquifer project. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 95 |
| End Page | 126 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307822 |
| JaLCDOI | 10.18926/15743 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_2_23.pdf |
| Author | Tanada Yoshihiro| Sano Hiroya| |
| Abstract | This paper describes a method for measuring very small transmission loss of impulsive signals. The correlative fluctuations within input and output signals are eliminated effectively by the analog simultaneous differencer. The difference and normal signals are alternately sampled and accumulated by the digitizer and the microcomputer, that is, the microcomputer 2-channels box-car integrator is realized. The difference and normal accumulated data are transferred to the personal computer, which calculates the ratio of the difference to normal accumulated data, i.e. the estimated attenuation in nepers. By the experiments of electrical and optical impulse transmissions, the minimum measurable attenuations become respectively 2.7×10(-4)NP and 6.0×10(-4)Np. Even the latter value is the smallest so far as the authors know. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1980-03-01 |
| Volume | volume14 |
| Issue | issue2 |
| Start Page | 23 |
| End Page | 31 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307200 |
| JaLCDOI | 10.18926/15742 |
|---|---|
| FullText URL | Mem_Sch_Eng_OU_14_1_61.pdf |
| Author | Kono Iichiro| Nishigaki Makoto| |
| Abstract | The purposes of this paper are primarily to research on behavior of groundwater flow in saturated and unsaturated zone and to develop the most effective methods for solving groundwater flow problems related to civil engineering practice. The mathematical model provides a finite element solution to two- or threedimensional problems involving transient flow in the saturated and unsaturated domains of nonhomogeneous, anisotropic porous media. Before progressing into the various levels of applications the input data and boundary conditions are discussed and evaluated. To demonstrate the flexibility of the finite element approach and its capability in treating complex situations which are often encountered in the field, the groundwater flow through sand bank at flood water levels and the flow through aquifer due to an excavation were analyzed. As the results there were good qualitative agreements between the numerical results and the informations received. |
| Publication Title | Memoirs of the School of Engineering, Okayama University |
| Published Date | 1979-12-01 |
| Volume | volume14 |
| Issue | issue1 |
| Start Page | 61 |
| End Page | 94 |
| ISSN | 0475-0071 |
| language | English |
| File Version | publisher |
| NAID | 120002307580 |
