start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=119
end-page=129
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Semiautomated Determination of COD in Environmental Water Samples
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KorenagaTakashi
kn-aut-sei=Korenaga
kn-aut-mei=Takashi
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=IkatsuHisayoshi
kn-aut-sei=Ikatsu
kn-aut-mei=Hisayoshi
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=MoriwakeToshio
kn-aut-sei=Moriwake
kn-aut-mei=Toshio
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=TakahashiTeruo
kn-aut-sei=Takahashi
kn-aut-mei=Teruo
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=Center for Environmental Conservation Technology, Okayama University.

affil-num=2
en-affil=
kn-affil=Center for Environmental Conservation Technology, Okayama University.

affil-num=3
en-affil=
kn-affil=Department of Synthetics Chemistry.

affil-num=4
en-affil=
kn-affil=Department of Industrial Chemistry.
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=111
end-page=118
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Properties of the Amorphous Fe(100-x)B(x) Alloy Prepared by rf-Sputtering Technique
en-subtitle=
kn-subtitle=
en-abstract=
kn-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).
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KanamaruFumikazu
kn-aut-sei=Kanamaru
kn-aut-mei=Fumikazu
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=OdaKiichi
kn-aut-sei=Oda
kn-aut-mei=Kiichi
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=MiyazakiSusumu
kn-aut-sei=Miyazaki
kn-aut-mei=Susumu
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=YoshioTetsuo
kn-aut-sei=Yoshio
kn-aut-mei=Tetsuo
aut-affil-num=4
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=TakahashiKatsuaki
kn-aut-sei=Takahashi
kn-aut-mei=Katsuaki
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=Research Institute for Non-Crystalline Materials

affil-num=2
en-affil=
kn-affil=Research Institute for Non-Crystalline Materials

affil-num=3
en-affil=
kn-affil=Research Institute for Non-Crystalline Materials

affil-num=4
en-affil=
kn-affil=Research Institute for Non-Crystalline Materials

affil-num=5
en-affil=
kn-affil=Department of Industrial Chemistry
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=73
end-page=110
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Experimental Study on Determining Unsaturated Property of Soil
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering.

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering.
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=53
end-page=72
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A Consideration on Physics of Saturated-UnsaturatedGroundwater Motion
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=NishigakiMakoto
kn-aut-sei=Nishigaki
kn-aut-mei=Makoto
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KonoIichiro
kn-aut-sei=Kono
kn-aut-mei=Iichiro
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Civil Engineering

affil-num=2
en-affil=
kn-affil=Department of Civil Engineering
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=33
end-page=51
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=System Identification Using Fast Fourier Transform
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KanedaMasahiro
kn-aut-sei=Kaneda
kn-aut-mei=Masahiro
aut-affil-num=1
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Electronics
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=23
end-page=31
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Microcomputer Filtering System to Measure Very Small Transmission Loss of Impulsive Signals
en-subtitle=
kn-subtitle=
en-abstract=
kn-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.
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=TanadaYoshihiro
kn-aut-sei=Tanada
kn-aut-mei=Yoshihiro
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=SanoHiroya
kn-aut-sei=Sano
kn-aut-mei=Hiroya
aut-affil-num=2
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Electronics

affil-num=2
en-affil=
kn-affil=Department of Electronics
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=13
end-page=22
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A High-powered Optoelectronic Switch with Picosecond Risetime
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=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.
en-copyright=
kn-copyright=

en-aut-name=KogaRyuji
en-aut-sei=Koga
en-aut-mei=Ryuji
kn-aut-name=古賀隆治
kn-aut-sei=古賀
kn-aut-mei=隆治
aut-affil-num=1
ORCID=

en-aut-name=EbaraMasami
en-aut-sei=Ebara
en-aut-mei=Masami
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=

en-aut-name=KosakaMegumi
en-aut-sei=Kosaka
en-aut-mei=Megumi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=

en-aut-name=SanoHiroya
en-aut-sei=Sano
en-aut-mei=Hiroya
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Electronics.

affil-num=2
en-affil=
kn-affil=Department of Electronics.

affil-num=3
en-affil=
kn-affil=Department of Electronics.

affil-num=4
en-affil=
kn-affil=Department of Electronics.
END

start-ver=1.4
cd-journal=joma
no-vol=14
cd-vols=
no-issue=2
article-no=
start-page=1
end-page=12
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=1980
dt-pub=19800301
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=The Analysis of Vocational Aptitude Changing with Age
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The assumption that vocational aptitude changed with age and with the kind of occupation was examined from the tendency of the fitted curve for the score of the aptitude test. 9 vocational aptitudes were measured by the general vocational aptitude test by Japan Labor Ministry. Subjects were 382 male workers (design engineers, turners, welders, can manufacturing workers, and crane operators) of from 20 to 59 years old, and 348 male and female students (junior high school, vocational school, and university) of from 15 to 19 years old. The design engineers' aptitudes advanced along the quadratic curve until 31 years old, but almost all the aptitudes of the other workers fell along the linear curve with age. The design engineers preserved various aptitudes until 52 years old, the turners 44, and the welders, the can manufacturing workers, and the crane
operators 37. The students' aptitudes were equal to those of the workers of from 15 to 25 years old. The workers preserved Spatial aptitude and Numerical aptitude until 45 years old. This could be said in all the occupations here.
Further it was made clear from the micromotion study that the influence of age was caused by therbligs
en-copyright=
kn-copyright=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=WadaMasayuki
kn-aut-sei=Wada
kn-aut-mei=Masayuki
aut-affil-num=1
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=OgawaKazuo
kn-aut-sei=Ogawa
kn-aut-mei=Kazuo
aut-affil-num=2
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=AkagiFumio
kn-aut-sei=Akagi
kn-aut-mei=Fumio
aut-affil-num=3
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=OsakiHirokazu
kn-aut-sei=Osaki
kn-aut-mei=Hirokazu
aut-affil-num=4
ORCID=

en-aut-name=
en-aut-sei=
en-aut-mei=
kn-aut-name=KikuchiSusumu
kn-aut-sei=Kikuchi
kn-aut-mei=Susumu
aut-affil-num=5
ORCID=

affil-num=1
en-affil=
kn-affil=Department of Industrial Science, School of Engineering Okayama University.

affil-num=2
en-affil=
kn-affil=Department of Industrial Science, School of Engineering Okayama University.

affil-num=3
en-affil=
kn-affil=Department of Industrial Science, School of Engineering Okayama University.

affil-num=4
en-affil=
kn-affil=Department of Industrial Science, School of Engineering Okayama University.

affil-num=5
en-affil=
kn-affil=Department of Industrial Science, School of Engineering Okayama University.
END