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Showing papers by "Nagoya Institute of Technology published in 1984"


Journal ArticleDOI
TL;DR: In this article, the class of limit distributions of Ornstein-Uhlenbeck processes on R d is characterized, and integro-differential equations for operator-self-decomposable distributions are established.

214 citations


Journal ArticleDOI
TL;DR: In this article, the elastic interaction between the ogdoad or double γ′ particles formed by the split reduces the total energy by overcoming the marked increase in surface energy due to the split.

163 citations


Journal ArticleDOI
TL;DR: In this paper, a GaAs with a mirror-like surface is grown by MOCVD on an Si substrate using an AlP, AlGaP, GaP/GaAs 0.5P0.5 super-lattice and GaAs0.6P0/GaA superlattices as intermediate layers, and the photoluminescence intensity is found to be about 56% of that of the GaAs substrate.
Abstract: GaAs with a mirror-like surface is grown by MOCVD on an Si substrate using an AlP, AlGaP, GaP/GaAs0.5P0.5 super-lattice and GaAs0.5P0.5/GaAs superlattice as intermediate layers. The photoluminescence intensity is found to be about 56% of that of a GaAs substrate grown under the same conditions and is one order of magnitude higher than that grown on a Ge-coated Si substrate, in spite of the early stage of the experiment.

100 citations


Journal ArticleDOI
TL;DR: In this article, the authors presented a method to extend an elastoplastic constitutive model valid only in the triaxial compression condition to one applicable in general stress conditions.

83 citations


Journal ArticleDOI
TL;DR: Performance in 400-m sprinting may depend mainly upon an energy supply from glycolysis in the long distance and untrained group, but in the sprinters is influenced not only by glycoleysis, but also by other factors such as content of ATP or force per unit muscle cross-sectional area.
Abstract: Lactate, glycerol, and catecholamine in the venous blood after 400-m and 3,000-m runs were determined in eight sprint runners, eight long distance runners, and seven untrained students. In 400-m sprinting, average values of velocity, peak blood lactate, and adrenaline were significantly higher in the sprint group than in the long distance and untrained groups. The mean velocity of 400-m sprinting was significantly correlated with peak blood lactate in the untrained (r=0.76,P<0.05) and long distance (r=0.71,P<0.05) groups, but not in the sprint group. In the 3,000-m run, on the other hand, average values of velocity and glycerol were significantly higher in the long distance group than in the sprint and untrained groups, but there are no significant differences in lactate levels between the three groups. These results suggest that 1) performance in 400-m sprinting may depend mainly upon an energy supply from glycolysis in the long distance and untrained group, but in the sprinters is influenced not only by glycolysis, but also by other factors such as content of ATP or force per unit muscle cross-sectional area; 2) peak blood lactate obtained after 400-m sprinting may be used as a useful indication of anaerobic work capacity in the long distance and untrained groups, but not in the sprinters. 3) high speed in the 3,000-m run could be maintained in the long distance runners by means of a greater energy supply from lipid metabolism as compared with sprinters or untrained subjects.

62 citations


Journal ArticleDOI
TL;DR: The dynamic behavior of a reservation system with a slotted ALOHA reservation channel is analyzed and the throughput and average message delay characteristics are obtained, and the system stability behavior is demonstrated.
Abstract: The dynamic behavior of a reservation system with a slotted ALOHA reservation channel is analyzed in this paper. It is assumed that each user handles one message at a time and that each message consists of a group of packets with a general probability distribution for group size. An approximate Markovian model of the system is developed on the assumption that the state transition can occur only at the beginning of each frame. The model is analyzed by an approximate analytical technique called equilibrium point analysis. The throughput and average message delay characteristics are obtained, and the system stability behavior is demonstrated. A procedure is also given to get the optimum set of system parameters under constraint that the system is stable.

56 citations


01 Aug 1984
TL;DR: In this paper, an approximate Markovian model of a reservation system with a slotted ALOHA reservation channel is developed on the assumption that the state transition can occur only at the beginning of each frame.
Abstract: The dynamic behavior of a reservation system with a slotted ALOHA reservation channel is analyzed in this paper. It is assumed that each user handles one message at a time and that each message consists of a group of packets with a general probability distribution for group size. An approximate Markovian model of the system is developed on the assumption that the state transition can occur only at the beginning of each frame. The model is analyzed by an approximate analytical technique called equilibrium point analysis. The throughput and average message delay characteristics are obtained, and the system stability behavior is demonstrated. A procedure is also given to get the optimum set of system parameters under constraint that the system is stable.

50 citations


Journal ArticleDOI
TL;DR: In this paper, detailed observations of selective MOCVD growth of Ga1−xAlxAlaxAs on substrates partly masked by a SiO2 film were carrie out in the complete range of AlAs fraction x.

48 citations


Journal ArticleDOI
01 Nov 1984
TL;DR: In this article, the authors compared the throughput versus average message delay tradeoff characteristics of six multiple access protocols: slotted ALOHA, reservation-ALOHA and fixed assigned TDMA, and SRUC (Split Reservation Upon Collision).
Abstract: This paper considers satellite packet communication networks with a large population of bursty users and presents an analytic comparison of the throughput versus average message delay trade-off characteristics of multiple-access protocols. The following six multiple-access protocols are examined: 1) slotted ALOHA, 2) reservation-ALOHA, 3) a reservation protocol with a slotted ALOHA reservation channel, 4) a reservation protocol with a TDMA reservation channel, 5) SRUC (Split Reservation Upon Collision), and 6) fixed assigned TDMA. All the protocols are required to ensure that all packets of a message are correctly received in the proper order at the destination. Then, a unified presentation of the delay-throughput performance of the protocols is given by means of an analytical technique called equilibrium point analysis. The throughput versus average message delay tradeoff characteristics are compared taking into account the system stability.

46 citations



Journal ArticleDOI
TL;DR: In this paper, a sintered apatite with enhanced strength was achieved by incorporating CaO-P2O5/metal oxide frit, and the average bending strength was 205.8 MP.
Abstract: A sintered apatite with enhanced strength was achieved by incorporating CaO-P2O5/metal oxide frit. When BaO or Al203 were partially substituted for CaO in the frit composition, the sintered product was stronger because grain growth was retarded. The average bending strength of the strongest sintered apatite was 205.8 MP.

Journal ArticleDOI
TL;DR: A calcium phosphate glass-ceramic crown for dentistry was developed that exhibits excellent mechanical strength and fine structure similar to that of the enamel of a natural tooth, and its hardness is near that of enamel
Abstract: A calcium phosphate glass-ceramic crown for dentistry was developed. The glass is cast into the shape of the crown by the lost-wax technique and subsequently heat-treated to convert it into the glass-ceramic, which exhibits excellent mechanical strength. The fine structure of the glass-ceramic is similar to that of the enamel of a natural tooth, and its hardness is near that of enamel.

Journal ArticleDOI
TL;DR: In this article, the problem of a kinked crack initiated from the tip of a rigid line inclusion is analyzed as a mixed boudary value problem and the stress distribution, stress intensity factors, singularity at the inclusion tip, and the resultant moment on the rigid line included in the inclusion are investigated.

Journal ArticleDOI
01 Nov 1984
TL;DR: Systematic approaches to designing feedback controllers and stability results for singularly perturbed discrete systems are given, and these results are used to investigate stabilizing problems for state feedback-controlled systems.
Abstract: Stabilizing problems for singularly perturbed discrete systems are considered. First, systematic approaches to designing feedback controllers are discussed. Second, stability results for singularly perturbed discrete systems are given, and these results are used to investigate stabilizing problems for state feedback-controlled systems.

Journal ArticleDOI
TL;DR: Water-in-oil emulsion was prepared from glycerol-alpha-monooleate, n-decane and water, and was used to analyze the behavior of bound water molecules in response to the addition of an inhalation anesthetic, enflurane, demonstrating that the anesthetic weakened the hydrogen bond between water and glycerols, and released bound interfacial water.

Journal ArticleDOI
TL;DR: In this paper, the fine structure parameter D in the spin Hamiltonian increases with lattice constant for the Cr 3+ -Li + center in KZnF 3, RbCdF 3 and CsCdFs 3 co-doped with Cr 3 + and Li + ions.
Abstract: Centres with tetragonal symmetry in KZnF 3 , KCdF 3 , RbCdF 3 and CsCdF 3 co-doped with Cr 3+ and Li + ions have been studied by EPR in the cubic phase of host crystals. Due to charge compensation some of Cr 3+ ions are associated with a cation vacancy (V M ) or a Li + ion at the nearest divalent-cation site. The magnitude of the fine structure parameter D in the spin Hamiltonian increases with lattice constant for the Cr 3+ -Li + centre. In KZnF 3 the magnitude of D for the Cr 3+ -Li + centre is smaller than that for the Cr 3+ -V M centre as expected from point charge model, whereas in KCdF 3 , RbCdF 3 and CsCdF 3 the former is larger than the latter against the expectation from the point charge model. The dependence of D on lattice constant is discussed.

Journal ArticleDOI
TL;DR: The results suggest that the magnitude of enzyme efflux from tissue into blood may be depressed by training, and that in well-trained sprinters plasma CK and LDH isozyme activities may be better indicators of physical training and/or physical performance than peak blood lactate or plasma LDH activities.
Abstract: Blood lactate concentration and the activities of plasma LDH and CK were determined in 13 well-trained middle distance runners after a 400-m sprint. It was found that there is a significant relationship between mean velocity in the 400-m sprint and plasma CK activity (r=−0.56,P<0.05), but the mean sprint velocity did not correlate with peak blood lactate concentration (r=−0.09) or plasma LDH activity (r=−0.40). There was a significant negative correlation between mean sprint velocity and H type LDH isozyme activity (r=−0.66,P<0.05), and a significant positive correlation with M type LDH isozyme activity (r=0.66,P<0.05). These results suggest that the magnitude of enzyme efflux from tissue into blood may be depressed by training, and that in well-trained sprinters plasma CK and LDH isozyme activities may be better indicators of physical training and/or physical performance than peak blood lactate or plasma LDH activities.

Journal ArticleDOI
TL;DR: In order to study the interface of calcium phosphate bioglass ceramics, cylinders of standard size were implanted in the tibiae of rabbits to show that bioceramics with hydroxyapatite surface give rise to a closer contact with new bone than calcium phosphate glass ceramic.

Journal ArticleDOI
TL;DR: In this article, the authors examined the strength of short columns with square or rectangular sections under loadings in directions corresponding to the principal axes of the section, as well as loads in diagonal directions.
Abstract: Short columns in reinforced concrete buildings have been shown to perform poorly under earthquake loads. This study examines the strength of short columns with square or rectangular sections under loadings in directions corresponding to the principal axes of the section, as well as loadings in diagonal directions. The results from 20 tests were considered. It was concluded that the shear capacity of short columns under loadings skewed with respect to the principal axes could be estimated simply and accurately using interaction curves.

Journal ArticleDOI
TL;DR: In this article, a line shape analysis of the ESR spectra employing a computer simulation technique has led to the following conclusions; (1) As5+ is reduced to As4+ in the solarization process.
Abstract: The solarization mechanism in a glass containing both Ce3+ and As5+, 16Na2O·11CaO·73SiO2:0.15AsOx·0.015CeOx (in mol.%), is newly proposed by elucidating the valence and coordination structure of arsenic after the photochemical reaction, the mechanism being traditionally expressed as 2 Ce 3+ + As 5+ → hv 2 Ce 4+ + As 3+ ESR hyperfine quartets due to an As4+ ranging from 0.1 to 0.5 T built up on UV-irradiation and their line shape varied with the duration of the irradiation. The line shape analysis of the ESR spectra employing a computer simulation technique has led to the following conclusions; (1) As5+ is reduced to As4+ in the solarization process. (2) The geometry around the As4+ in the solarized glass is tetrahedral during the early stage and trigonal-pyramidal during the latter stage of the reaction.

Journal ArticleDOI
TL;DR: In this paper, a thin plate bending problem subject to transverse bending and torsion was analyzed as a plane eleastic problem with bending in the plane and uniaxial tension, and the rational mapping function of a sum of fractional expressions and complex variable method were used.

Journal ArticleDOI
TL;DR: In this paper, a method of estimating single electrode heat balances during the electrolysis of molten NaCl-ZnCl2 in a cell using a β-alumina diaphragm was presented.
Abstract: This paper deals with a method of estimating single electrode heat balances during the electrolysis of molten NaCl-ZnCl2 in a cell using aβ-alumina diaphragm. By measuring the thermoelectric power of the thermogalvanic cells: (T) Na/β-alumina/NaCl-ZnCl2/β-alumina/Na(T+dT) and (T) C,Cl2/NaCl-ZnCl2/Cl2,C(T+dT) the single electrode Peltier heat for sodium deposition and for chlorine evolution at 370° C were estimated to be −0.026±0.001 JC−1 and+0.614±0.096 J C−1, respectively.

Journal ArticleDOI
TL;DR: The functional form of the thickness dependence of the pinning energy of kinks due to discreteness of substrate lattices is discussed by using the contour integral method in this article.
Abstract: The functional form of the thickness dependence of the pinning energy of kinks due to discreteness of substrate lattices is discussed by using the contour integral method. It is shown that the functional form can be guessed without knowing the energy distribution as a function of coordinate. The relative stability of the kinks of the odd and the even types may be sometimes reversed according to the parameter values describing the substrate potential. The result previously reported for a nonlinear deformable potential is interpreted. The contour integral method is applied to calculate the pinning energy of the double quadratic kinks.

Journal ArticleDOI
01 Jul 1984-Polymer
TL;DR: When polypropylene was fractured with tetracyanoethylene (TCNE) in the dark in vacuo at 77 K, the TCNE anion radical, TCNE, was detected using esr methods as mentioned in this paper.

Journal ArticleDOI
Fumio Hine1, Masaki Yasuda1, T. Iida1, Y. Ogata1, K. Hara1 
TL;DR: In this article, the degradation mechanism of β-PbO 2 on the RuO 2 loaded Ti substrate was studied, and the service life time depended on the Ti/Ru ratio of the interlayer and the operating current density.

Journal ArticleDOI
TL;DR: In this article, the structure, the formation and activation energies of a domain wall in crystals are discussed on the basis of analyses of a first order transition model in the close vicinity of the transition temperature, the domain wall is considerably extended.
Abstract: The structure, the formation and the activation energies of a domain wall in crystals are discussed on the basis of analyses of a first order transition model In the close vicinity of the transition temperature, the domain wall is considerably extended For the estimation of the activation energy of a thick domain wall the method of the contour integral was adopted It has turned out that the relative stability of an even and an odd walls varies with temperature

Journal ArticleDOI
TL;DR: In this article, the electronic states in Zr-Ni and ZrNi-D alloy glasses are studied over wide ranges of nickel and deuterium concentrations by measuring Zr L β 2,15 and Ni L α 1,2 emission bands.
Abstract: Electronic states in Zr-Ni and Zr-Ni-D alloy glasses are studied over wide ranges of nickel and deuterium concentrations by measuring Zr L β 2,15 and Ni L α 1,2 emission bands. Zirconium L β 2,15 is modified deep in the band while Ni L α 1,2 undergoes a minor change near the Fermi edge. These spectra suggest that chemical bonding among constituent atoms affects the band structures of the glasses significantly. A sign of preference for Zr-D bonding to Ni-D bonding is observed and its effect on the band structure is discussed.

Journal ArticleDOI
TL;DR: In this article, the propagation direction of a kinked crack initiating from a rigid line inclusion is investigated, and the criteria of maximum energy release rate, maximum Mode I stress intensity factor, and zero Mode II stress intensity factors are used as predictors for the kinking crack direction.

Journal ArticleDOI
TL;DR: In this article, the dependence of the growth rate of MOCVD-grown GaAs and AlAs on the growth temperature and the V/III ratio was investigated, and it was shown that the GaAs growth rate suddenly began to decrease above a critical temperature Tc, and the uniformity in the layer thickness deteriorated above Tc.
Abstract: The dependence of the growth rate of MOCVD-grown GaAs and AlAs on the growth temperature and the V/III ratio was investigated. It was found that (1) the growth rate suddenly began to decrease above a critical temperature Tc, (2) the uniformity in the layer thickness deteriorated above Tc, and (3) the growth rate of GaAs began to depend on the V/III ratio above Tc while that of AlAs did not. A new growth mechanism including Ga atoms and Ga-complexes as the active species contributing to the growth is proposed, and it is shown that the most plausible Ga-complex consists of [GaAs]n molecules.

Journal ArticleDOI
TL;DR: In this paper, seven o,o′-dihydroxyazo dyes were synthesized and examined as spectrophotometric reagents for magnesium and calcium, including 2-(2-hydroxy-3,6-disulfo-1-naphthylazo)-5-(N,N-diethylamino)phenol.