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JaLCDOI 10.18926/15771
フルテキストURL Mem_Sch_Eng_OU_18_1_75.pdf
著者 Ohzuku Tsutomu| Hirai Taketsugu|
抄録 A basic kinetic equation of potential-step chronoamperometric current-time curve controlled by the rates of diffusion and electron transfer for a simple one-electron charge transfer reaction was given and various features of current-time curves were deduced from a theoretical treatment. The current-time equations for reversible and irreversible electron transfer processes appear as special cases with limited conditions of the equation reported in the present paper. And a potential-step chronoamperometric method to determine kinetic parameters from a current-time curve was proposed therefrom. The extension of a basic kinetic equation to more general multistep charge-transfer process was also considered.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1984-03-30
18巻
1号
開始ページ 75
終了ページ 89
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307131
JaLCDOI 10.18926/15768
フルテキストURL Mem_Sch_Eng_OU_18_1_57.pdf
著者 Ohzuku Tsutomu| Sawai Keijiro| Hirai Taketsugu|
抄録 Basic kinetic equations of chronopotentiometric potential-time curves, in which the equations for reversible, quasi-reversible and irreversible electron transfer process appeared in special cases, were given and a chronopotentiometric method for determining kinetic parameters was proposed therefrom. The method was demonstrated for Fe(3+)/Fe(2+) redox reaction in acidic aqueous media. The limitations of the method and the double-layer charging effects on the potential-time curve were discussed. The extension of the method to more general electrode processes was also considered.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1984-03-30
18巻
1号
開始ページ 57
終了ページ 73
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307985
JaLCDOI 10.18926/15765
フルテキストURL Mem_Sch_Eng_OU_15_1_111.pdf
著者 Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Tosio| Takahashi Teruo|
抄録 On the flow injection analysis (FIA) of chemical oxygen demand (COD), silver salt was added as an oxidation catalyst for COD substances and a masking agent for halide to improve operating conditions of the FIA apparatus. Both of a proper concentration of potassium permanganate solution and 6.0 % sulfuric acid solution containing 0.1 % silver nitrate are individually pumped up with respective flow rates of 0.51 ml min(-l) and merged into a carrier stream. A 20 μ1 of sample solution is injected into the flow of sulfuric acid solution at just before the merging place. The sample mixed with the carrier solutions in a reaction manifol(polytetrafluoroethylene tubing: 0.5 mm i.d. x 30 m), is passed through a thermostated bath at 100 °c and led to a flow cell for the absorbance measurements at 525 nm. The absorbances are continuously recorded with time. The peaks in the recordings showed good reproducibility and the calibration obtained at a linear concentration range of 0 - 170 mg 1(-1) COD with glucose as standard. The detection limit and precision confirmed with this method were 5 mg 1(-1) and 0.8 %, respectively. Chloride ion up to 200 mg 1(-1) did not interfere without elimination of a silver chloride precipitate. By the present FIA method, several industrial waste water samples were analyzed at a sampling rate of about 40 samples per hour, and their apparent COD values were compared with those found by the manual JIS method. Both of the methods gave the similar results within an error range from -35 to +5 %.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-11-29
15巻
1号
開始ページ 111
終了ページ 121
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307490
JaLCDOI 10.18926/15759
フルテキストURL Mem_Sch_Eng_OU_15_1_61.pdf
著者 Furutani Yoichiro| Deutsch Claude| Gombert Marie M.| Oda Yoshinori|
抄録 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.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-11-29
15巻
1号
開始ページ 61
終了ページ 78
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307432
JaLCDOI 10.18926/15756
フルテキストURL Mem_Sch_Eng_OU_15_1_47.pdf
著者 Koga, Ryuji| Nagase, Satoru| Kosaka, Megumi| Sano, Hiroya|
抄録 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.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-11-29
15巻
1号
開始ページ 47
終了ページ 60
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307627
JaLCDOI 10.18926/15752
フルテキストURL Mem_Sch_Eng_OU_14_2_119.pdf
著者 Korenaga Takashi| Ikatsu Hisayoshi| Moriwake Toshio| Takahashi Teruo|
抄録 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.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-03-01
14巻
2号
開始ページ 119
終了ページ 129
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307775
JaLCDOI 10.18926/15749
フルテキストURL Mem_Sch_Eng_OU_14_2_73.pdf
著者 Kono Iichiro| Nishigaki Makoto|
抄録 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.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-03-01
14巻
2号
開始ページ 73
終了ページ 110
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307379
JaLCDOI 10.18926/15743
フルテキストURL Mem_Sch_Eng_OU_14_2_23.pdf
著者 Tanada Yoshihiro| Sano Hiroya|
抄録 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.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-03-01
14巻
2号
開始ページ 23
終了ページ 31
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307200
JaLCDOI 10.18926/15741
フルテキストURL Mem_Sch_Eng_OU_14_2_13.pdf
著者 古賀 隆治| Ebara, Masami| Kosaka, Megumi| Sano, Hiroya|
抄録 A switch element has been developed so that a kilovolt step voltage should be supplied to a 50Ω transmission line with a subnanosecond rise time. The element is of silicon substrate with high purity and a pair of electrodes is attached by the evaporation process. The switch action is performed by the photoconductivity produced by the laser light pulse. This paper deals with a preliminary analysis, manufacturing processes and experimental results of the optoelectronic switch. A performance of 320V output with less than 4 ns risetime was obtained with sufficient persistence for more than 2×10(5) pulse shots. This switch was successfully applied to an optical waveform monitor for laser light pulses giving a resolution less than 2 ns.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1980-03-01
14巻
2号
開始ページ 13
終了ページ 22
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307887
JaLCDOI 10.18926/15740
フルテキストURL Mem_Sch_Eng_OU_14_1_55.pdf
著者 古賀 隆治| Hirao, Keiji| Kosaka, Megumi| Sano, Hiroya|
抄録 An absorption spectrum of γ-0 band of nitric monoxide of very dilute density was taken. An experimental electronic device showed a distinguishing power of 0.01 ppm through 10 m optical pathlength. By the aid of a data processing based on a principle developed by the authors, this sensitivity does not suffer from coexisting sulfur dioxide, which shares the absorption band with the nitric monoxide.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1979-12-01
14巻
1号
開始ページ 55
終了ページ 60
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307855
JaLCDOI 10.18926/15734
フルテキストURL Mem_Sch_Eng_OU_14_1_1.pdf
著者 Yamashita Yuhiko| Monobe Kazuo|
抄録 The molecular mechanism of chain tilt in poly(ethylene terephthalate) (PET) fibers was proposed. The mechanism was considered basing on the ordering process from the cold drawn state of glassy PET. It was confirmed that the direction of maximum contraction on ordering agrees with the azimuth of chain tilt which varies with annealing temperature. In the stacking structure of irregular folded chain blocks of cold drawn PET, the expansion to the chain direction and the contraction to the lateral direction yield the compressive stress and tensile stress r respectively. The stress revealed as the result of the ordering from the glassy structure to crystalline structure can be relaxed by the rotation of the resulting crystallites. Therefore, we can suggest that the chain tilt is caused by the relaxation process of the stress.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1979-12-01
14巻
1号
開始ページ 1
終了ページ 7
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307641
JaLCDOI 10.18926/15723
フルテキストURL Mem_Sch_Eng_OU_13_195.pdf
著者 Sano, Hiroya| 古賀 隆治| Tanada Yoshihiro| Kosaka, Megumi|
抄録 The maximally attainable accuracy of an airpollution monitoring system is investigated. The system is composed of a tunable pulsed dye laser as the light source, photodiodes as the opto-electric converter and a low noise electronic signal processor specifically designed by the authors. The extreme value of the accuracy is given in terms of the standard deviation of the attenuation. The value is 3.4×10(-4)[Nep√(pulse number)] for an averaged value for multiple laser shots. Also the wavelength reproduceability of a dye laser was examined, which resulted in that a computer should take a part in the wavelength control in order that this method should be feasible.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1979-03-05
13巻
開始ページ 195
終了ページ 207
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307857
JaLCDOI 10.18926/15722
フルテキストURL Mem_Sch_Eng_OU_13_181.pdf
著者 Sano, Hiroya| 古賀 隆治| Tanada, Yoshihiro| Kosaka, Megumi|
抄録 This report deals with a notion of adjoint spectrum which is applicable to air-pollution monitoring by using pulsed lasers. Both Raman and absorption spectra of multiple gas complex are linear combinations of the spectra, each of which is specific to a gas species and its magnitude is proportional to the density. An extended formulation of the method of least squares is made in terms of a new notion, adjoint spectra, which visualizes the structure of the numerical filter. Applications of the derived numerical filters to the two methods are shown and features are described about the synthesized filters.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1979-03-05
13巻
開始ページ 181
終了ページ 193
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307476
JaLCDOI 10.18926/15697
フルテキストURL Mem_Sch_Eng_OU_5_61.pdf
著者 Misaki Takayoshi| Okamoto Takuji| Yamamoto Hideki|
抄録 An asynchronous delay line for PAM signal having controlled delay capability is proposed. The delay line in a cascaded chain of identical memory cells. Each sample of the sequence of the input PAM signals passes or is shifted in particular cell depending on whether the succeeding cell is empty or not. A cell is composed of two memory capacitors with the peripheral control circuits. In this paper, especially, an example of the circuit for cell is shown and its several characteristics are discussed. At the end, some experimental results are given.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1970-09-01
5巻
1号
開始ページ 61
終了ページ 66
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307866
JaLCDOI 10.18926/15693
フルテキストURL Mem_Sch_Eng_OU_10_2_81.pdf
著者 榊原 精|
抄録 To acquire information on the interaction between oxygen molecules in solid phase, studies have been carried out on the magnetic properties of solid oxygen, oxygen-argon and oxygen-fluorine. Review of the studies on the interaction between oxygen molecules is cited. Magnetic susceptibility was measured by the Faraday method as a function of temperature from 12 K to the melting point of them. Pure oxygen both in α and β phase indicates paramagnetism corresponding to long-range antiferromagnetic order. Oxygen -argon mixtures of 92~66 mol% oxygen content indicate large susceptibility corresponding to δ phase, which can be interpreted in terms of the cluster of oxygen molecules in trimer. Small paramagnetism was found for the oxygenfluorine mixture even as dilute as 10 mol% oxygen content, which may be due to the strong antiferromagnetic interaction. This can be interpreted in terms of super-exchange interaction between oxygen molecules via fluorine molecule.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1976-01-27
10巻
2号
開始ページ 81
終了ページ 111
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307359
JaLCDOI 10.18926/15691
フルテキストURL Mem_Sch_Eng_OU_5_47.pdf
著者 Takahashi Katsuaki| Miura Yoshinari|
抄録 Diffusion phenomena of silver ion in the molten sodium diborate of low silver ion content were investigated at the temperature range from 880℃ to 625℃ by means of chronopotentiometry. From the results, it was shown that the silver ion was reduced reversibly to metallic state at the silver electrode used and silver ion was transported only by diffusion in case that transition time in a potential-time relation was within several seconds. Diffusion coefficients measured at various temperatures satisfied Arrhenius equation. The activation energy of diffusion and diffusion coefficient were respectively 32Kcal/mol and 6.5×10(-7) cm(2)/sec at the liquidous temperature. By comparing these values with those obtained in some molten salts, the difference of structure between the molten glass and molten salts was discussed. Moreover, the consideration for the size of borate anion existing in the molten glass was also tried from the viewpoint of rate process and from Stokes-Einstein's equation.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1970-09-01
5巻
1号
開始ページ 47
終了ページ 53
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307810
JaLCDOI 10.18926/15640
フルテキストURL Mem_Sch_Eng_OU_6_53.pdf
著者 Yamashita Yuhiko| Monobe Kazuo|
抄録 Lamellar crystals of amylose V complexes with the 6(1), 7(1) and 8(1) helical configurations can be prepared from aqueous solutions of amylose by using various complexing agents. It is noted that the crystal shape can be explained by the symmetry of the unit cell in the basal plane and the chain packing in the unit cell is cOncerned with the symmetry of helical chains. The existence of 6(1), 7(1) and 8(1) heliccs which occurs stepwisc with the number of glucopyranose an intger is discussed.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1971-09-01
6巻
1号
開始ページ 53
終了ページ 56
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307483
JaLCDOI 10.18926/15636
フルテキストURL Mem_Sch_Eng_OU_6_27.pdf
著者 Ohta Mutsuo| Hashimoto Fumio| Maeda Hironobu|
抄録 Fiber textures of drawn wires of Al-Zn alloys containing precipitates were studied mainly by X-ray methods. In supersaturated solid solution the wire texture was a double fiber texture with [100]and [111]. It was considered that a phase precipitates were rotated with matrix, while they were deformed. And then the matrix containing stable precipitates (Zn) had [100] and [111] textures. The intense spots, corresponding to [111] fiber texture of matrix, in the Debye rings of (002)p and (101)p planes of precipitates were clearly observed. But, on the other hand, spots, corresponding to [100] fiber texture of matrix, shown the prefered orientation of precipitates in (002)p Debye ring were very weak and brodening.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1971-09-01
6巻
1号
開始ページ 27
終了ページ 31
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307980
JaLCDOI 10.18926/15615
フルテキストURL Mem_Sch_Eng_OU_3_107.pdf
著者 Takeda Akira| Torii Sigeru| Oka Hirotosi|
抄録 The electrochemical oxidation of trans-cinnamic acid in a mixed aqueous solution of acetic acid and methanol containing potassium hydroxide was studied. The separation of ketones and aldehydes from the neutral materials using Girard reagent P gave benzaldehyde, tolualdehydes, acetophenone, methylacetophenones, propiophenone, phenacyl acetate, and phenacyl alcohol. The mechanism of the anodic reaction of trans-cinnamic acid has been discussed.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1968-09-01
3巻
1号
開始ページ 107
終了ページ 112
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307863
JaLCDOI 10.18926/15614
フルテキストURL Mem_Sch_Eng_OU_3_101.pdf
著者 Hirai Taketsugu| Takahashi Katsuaki|
抄録 Potential sweep voltammetries of Na(2)O·SiO(2) and Na(2)O·2SiO(2) at 730-1200°C were performed with the stationary platinum wire electrode and with the sweep rates of 40 and 120mV/sec. Although current-potential relation of Na(2)O . SiO(2) at 1200°C gave stationary S-shape pattern, those of the rest were transient modes with hysteresis. From the voltammetric considerations, a reversible oxygen electrode process where diffuion of free oxygen anion or silicate anion may be a rate-determining stage was tentatively proposed. Approximate estimations of decomposition voltage supported that a sole reaction process such as the decomposition of Na(2)O or indirect decomposition of SiO(2) in the melt was most probable.
出版物タイトル Memoirs of the School of Engineering, Okayama University
発行日 1968-09-01
3巻
1号
開始ページ 101
終了ページ 105
ISSN 0475-0071
言語 英語
論文のバージョン publisher
NAID 120002307459