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Showing papers by "Nagoya Institute of Technology published in 1982"


Journal ArticleDOI
TL;DR: In this article, the linear velocity of electro-osmosis in a capillary tube 30 ×90 cm x 30 −200 μm I.D. was measured, and the physical and geometrical parameters of EOSMosis and its use were discussed.

306 citations


Journal ArticleDOI
TL;DR: In this paper, the doublets of Ni 3 Al alloys were found to be produced by a widening and a subsequent splitting of the cuboidal γ′ precipitate, which can be quantitatively rationalized by assuming that the increment in the surface energy caused by the splitting is compensated for by the elastic interaction energy between the paired π plates.

161 citations



Journal ArticleDOI
TL;DR: In this paper, electrical conductivity data were obtained for M O·P 2 O 5 glasses (M = Be, Mg, Ca, Sr, Ba) containing small amounts of water.
Abstract: D.c. electrical conductivity data were obtained for M O·P 2 O 5 glasses ( M = Be, Mg, Ca, Sr, Ba) containing small amounts of water. The results suggest that the mobility of protons in the glasses increases with decreasing OH bonding strength. The relation between the proton concentration and the conductivity or the apparent activation energy was studied for calcium metaphosphate glasses containing various amounts of water. The conductivity was found to be proportional to the square of the proton concentration; the apparent activation energy decreased linearly with increasing logarithm of proton concentration.

72 citations


Journal ArticleDOI
TL;DR: The phase constitution of alite in portland cement clinker highly depends not only in the chemical composition of a raw mix but also on the kinetics of crystallization from the interstitial melt as mentioned in this paper.

70 citations


Journal ArticleDOI
TL;DR: The results suggest that CLA7.65 may be used as a valid indicator of anaerobic work capacity in man and agreed well with the observed peak blood lactate concentration.
Abstract: Blood lactate was determined in 19 untrained subjects after maximal treadmill exercise lasting for about 1 min. It was found that blood lactate increases after exercise, reaching a maximum level 6–9 min after the cessation of exercise, and the average time for the appearance of the peak blood lactate concentration was 7.65 min. Peak blood lactate concentration at 7.65 min (CLA7.65), which was calculated by substituting t (7.65) into the equation for the lactate recovery curve for each subject, agreed well with the observed peak blood lactate concentration (r=0.98, p<0.001). In addition, correlations of r=−0.65, r=−0.78, r=−0.79 were found between CLA7.65 and the running times of 100 m, 200 m, and 400 m sprints, respectively. These results suggest that CLA7.65 may be used as a valid indicator of anaerobic work capacity in man.

59 citations


Journal ArticleDOI
TL;DR: In this paper, the phase identification of alite in portland cement clinker has been made by combined use of microscopy during heating, X-ray powder diffraction, and differential thermal analysis.

54 citations


Journal ArticleDOI
TL;DR: In this article, the steady-state solutions of the time-dependent equations of momentum and energy with the Poisson equation for pressure were obtained without the aid of a large Prandtl number assumption for combined forced and free laminar convection in the entrance region of a horizontal pipe.
Abstract: Numerical solutions are given without the aid of a large Prandtl number assumption for combined forced and free laminar convection in the entrance region of a horizontal pipe with uniform wall temperature. The steady-state solutions have been obtained from the asymptotic time solutions of the time-dependent equations of momentum and energy with the Poisson equation for pressure. Results are presented for the developing primary and secondary velocity profiles, developing temperature fields, local wall shear stress, and local and average Nusselt numbers, which reveal how the developing flow and heat transfer in the entrance region are affected by the secondary flow due to buoyancy forces.

43 citations


Journal ArticleDOI
TL;DR: In this article, the EPR spectra of three kinds of Cr 3+ centres in K 2 ZnF 4 and K 2 MgF 4 were reported, and the values of the parameters ( g // - g ⊥ ) and D in the spin Hamiltonian were discussed by considering the effective negative charge distribution surrounding the Cr 3 + ion.
Abstract: The EPR spectra of three kinds of Cr 3+ centres in K 2 ZnF 4 and K 2 MgF 4 are reported. The Cr 3+ ion in each centre replaces the divalent cation substitutionally. The centre I (tetragonal symmetry) is ascribed to a vacancy-free Cr 3+ ion. In centre II (nearly-trigonal) a vacancy is present at the nearest K + site and in centre III (nearly-tetragonal) at divalent cation site. For each centre the values of the parameters ( g // - g ⊥ ) and D in the spin Hamiltonian are discussed by considering the effective negative charge distribution surrounding the Cr 3+ ion. In the vacancy-associated centres the values of D are interpreted by superposition of two uniaxial spin-Hamiltonian terms. Results of 19 F-ENDOR of K 2 MgF 4 : Cr 3+ are also presented.

42 citations


Book ChapterDOI
01 Jan 1982
TL;DR: The authors measured mean velocity and temperature in a turbulent boundary layer on a heated convex surface of modest curvature (δ/R ∼ 0.01) and found that curvature effects on heat transfer were surprisingly large.
Abstract: Measurements of mean velocity and temperature, and of surface heat flux, have been made in a turbulent boundary layer on a heated convex surface of modest curvature (δ/R ∼0.01). The results show surprisingly large curvature effects on heat transfer: at the end of the curved plate the Stanton number fell by 18% of the predicted flat plate value; the corresponding fall in the skin friction coefficient was 10%.

32 citations


Journal ArticleDOI
TL;DR: In this article, the electronic structures of transition metal (Fe, Ni)-metalloid (B, Si, P) alloy glasses are investigated by soft X-ray spectroscopy.
Abstract: The electronic structures of transition metal (Fe, Ni)-metalloid (B, Si, P) alloy glasses are investigated by soft X-ray spectroscopy. In Fe-based alloy glasses a single peak is commonly observed at 4∼6 eV below the emission edges of the B K α , Si K β and P K β spectra, while a weak hump is seen at the bottom of the main peak of the Fe L α spectrum. Similar data are obtained for Ni-based alloy glasses. These results are consistent with recent band calculations on amorphous Fe–B and Fe–P alloys by Fujiwara, and can be explained in terms of bonding-antibonding splittings of the metalloid p bands hybridizing with the transition metal d bands. It is concluded that chemical bonding among the constituent atoms contributes to the stabilization of these metallic glasses.

Journal ArticleDOI
TL;DR: A series of depth profiles in Au 0.56 Cu 0.44 produced by bombarding at − 120°C with an argon ion beam of 2 keV energy and current densities of 4, 6, 12 and 24 μA/cm 2, respectively, are presented in this paper.

Journal ArticleDOI
TL;DR: In this article, some 2-(2-thiazolylazo)-4-methyl-5-(sulfomethylamino)benzoic acid derivatives are synthesized.

Journal ArticleDOI
TL;DR: In this paper, the fourth-order parameters in the spin Hamiltonian of both cubic and tetragonal centres are discussed in the series of perovskite fluorides and the superposition model for the fourthorder parameter is examined.
Abstract: EPR measurements for substituted Gd 3+ centres in CsCaF 3 , CsCdF 3 , RbCdF 3 and KCdF 3 have been made at several temperatures in a range 77-487 K. In all the crystals the spectrum with tetragonal symmetry for Gd 3+ centre associated with the nearest-neighbour cation vacancy has been observed together with that for cubic centre. The observed fourth-order parameters in the spin Hamiltonian of both cubic and tetragonal centres are discussed in the series of perovskite fluorides. The result suggests that the parameter b 4 for Gd 3+ in 6-fold cubic coordination changes its sign as the lattice constant decreases. The superposition model for the fourth-order parameter is examined.

Journal ArticleDOI
TL;DR: In this article, the first successful dual wavelength dual wavelength laser emitting at 12 μm and 13 μm wavelengths was described. The first successful single-antenna dual-wavelength dual-wave laser was operated up to 0°C.
Abstract: The first successful dual wavelength lasers emitting at 12 μm and 13 μm wavelengths are described The lasers operated up to 0°C

Journal ArticleDOI
TL;DR: In this paper, a CaO-P2P5 glass ceramics were prepared by crystallizing glass rods or plates unidirectionally in a temperature-gradient furnace.
Abstract: New CaO-P2P5 glass ceramics were prepared by crystallizing glass rods or plates unidirectionally in a temperature-gradient furnace. The unidirectionally crystallized glass showed extremely high bending strength (∼500 to 600 MN/m2) even when subjected to a severe abrasion treatment with Sic paper. Scanning electron microscopy of fracture surjaces revealed a typical fiber-reinforced-composite structure. Crystalline phases and crystallographic directions were checked by X-ray diflraction. The fracture mechanism is discussed in terms of microstructure.

Journal ArticleDOI
TL;DR: In this paper, the Raman spectra of bovine serum albumin-detergent complexes were measured and the secondary structural change of the protein caused by the detergent binding was confirmed by observations of the amide I, III and a skeletal vibrational region.

Journal ArticleDOI
TL;DR: In this article, three sulfonated 1-(2-pyridylazo)-2-naphthols and six sulfonsated 2-(pyrideylazos)-1naphthsols were synthesized, and their application to the spectrophotometric determination of metals was studied.

Journal ArticleDOI
TL;DR: In this paper, an experimental study on the flow field produced by a vortex ring approaching a plane wall perpendicular to its axis of symmetry, using smoke visualization technique, was carried out.
Abstract: Experimental studies were carried out on the flowfield produced by a vortex ring approaching a plane wall perpendicular to its axis of symmetry, using smoke visualization technique. The mechanism of rebound of a vortex ring from the wall is shown to be related to generation of a shear layer separated from the wall and its subsequent development. The effects of Reynolds numbers on the trajectory of the core center of a vortex ring were also examined. Growth of the separated shear layer and generation of the secondary vortex ring due to vorticity concentration in the separated shear layer were visualized in detail.

Journal ArticleDOI
TL;DR: In this paper, a high purity MA-PTHF macromer was obtained by a coupling method which involved the reaction of sodium methacrylate with living PTHF, indicating one vinyl group per molecule.
Abstract: Methacryloyloxyl polytetrahydrofuran (MA-PTHF) macromer was prepared by the coupling method which involved the reaction of sodium methacrylate with living PTHF. The MA-PTHF macromer obtained by this method was shown to be highly pure macromer by a UV spectrometric method, indicating one vinyl group per molecule. The radical polymerization of the macromer was performed to check the polymerizability of the macromer. At a relatively high concentration of the macromer, it was homopolymerized at a high conversion of ca. 90%. Furthermore, the macromer was quantitatively copolymerized with styrene to the copolymer. This quantitative conversion is consistent with the high purity of MA-PTHF macromer obtained.

Journal ArticleDOI
TL;DR: Packed microcapillary columns with internal diameters and particle size (silica gel) 30-40 μm and 10 μm, respectively, were prepared with the aim of reducing analysis time as mentioned in this paper.

Journal ArticleDOI
TL;DR: In this paper, the effects of surface roughness on the flow between two concentric cylinders, one of which rotates, were investigated and it was shown that the effect of the roughness of the inner cylinder is greater than that of the outer one for both cases.
Abstract: This paper describes an experimental study of the effects of surface roughness on the flow between two concentric cylinders, one of which rotates. The surface roughness has some effects on the coefficient of viscous frictional torque CM in the transient and in the fully developed turbulent region. In the fully developed rough turbulent flow, the value of CM depends on both the Reynolds number Rω and the relative roughness rm/k in the case where the outer cylinder rotates, but CM depends only on rm/k in the case where the inner cylinder rotates. The effect of the surface roughness of the inner cylinder is greater than that of the outer one for both cases.

Journal ArticleDOI
TL;DR: In this article, the temperature dependence of the spectra around three crystallographic axes of CoCl 4 tetrahedra around the c-axis was investigated and it was concluded that the incommensurable modulation wave rotated the CoCl4 tetrahedral around the C -axis in the inccomensurate phase.
Abstract: ESR spectra of Mn 2+ doped in {N(CH 3 ) 4 } 2 CoCl 4 crystal were observed in the phases I, II, III, IV and V. From the temperature dependence of the spectra around three crystallographic axes, it was concluded that the incommensurable modulation wave rotated the CoCl 4 tetrahedra around the c -axis in the incommensurate phase. The amplitude of the modulation wave has the temperature dependence of Δ ϕ∝( T I - T ) 0.35 from 11°C to 21°C. The rotation angles of CoCl 4 tetrahedra around the c -axis were determined in the commensurate phase.

Journal ArticleDOI
TL;DR: InGaAsP/InP dual wavelength TJS lasers emitting at 1.17 μm and 1.3 μm wavelengths at room temperature are described in this article, where the threshold currents for both diodes are the same.
Abstract: InGaAsP/InP dual wavelength TJS lasers emitting at 1.17 μm and 1.3 μm wavelengths at room temperature are described. The threshold currents for both diodes are the same. The fabrication procedure and characteristics of the lasers are presented.


Journal ArticleDOI
TL;DR: In this paper, a low energy shoulder was observed at the bottom of the spectrum of zirconium (Zr 4d5s band) which is attributed to the formation of bonding states involving Zr 4D5s and H 1s states.
Abstract: To elucidate the bonding nature in hydrogenated transition metal alloy glasses, measurements were made of X-ray L3 emissions of the transition metals using an XMA analyser. Most of the investigations were performed using amorphous Zr0.65Pd0.35 and Zr0.67Ni0.33 ribbons. Hydrogen or deuterium was added to the ribbons by gas absorption at high pressure. The ratio of hydrogen (deuterium) to metal was 1.0. Upon hydrogenation a low energy shoulder developed at the bottom of the L3 spectrum of zirconium (Zr 4d5s band) which is attributable to the formation of bonding states involving Zr 4d5s and H 1s states. No such spectral changes occur in the L3 spectra of palladium and nickel. These results suggest that hydrogen atoms prefer to occupy the interstitial sites adjacent to zirconium rather than to palladium and nickel atoms to form Zr-H bonding states in the amorphous structures. The modification of band structures due to alloying and hydrogenation is discussed.

Journal ArticleDOI
TL;DR: In this paper, it was shown that for every finite subgroup G of SL(2,ℂ), the invariant subring ℂ[X,Y]G is a hyper-surface.
Abstract: It is known that for every finite subgroup G of SL(2,ℂ), the invariant subring ℂ[X,Y]G is a hyper-surface. In this note we treat finite subgroups of SL(3,ℂ) and give complete classification of the finite subgroups of SL(3,ℂ) whose invariant subrings are complete intersections.

Journal ArticleDOI
TL;DR: In this article, thermally stimulated polarization and depolarization currents were measured for thin films of lithium-sodium disilicate glasses, and the low-temperature peak was attributed to conduction polarization of alkali ions, while the high temperature was attributed by localized motion of non-bridging oxygens in the alkali-depleted region near the anode rather than to space charge or interfacial polarization.
Abstract: Thermally stimulated polarization and depolarization currents were measured for thin films of lithium-sodium disilicate glasses. As reported previously two thermally stimulated depolarization current peaks were found. The low-temperature peak was attributed to conduction polarization of alkali ions, while the high-temperature was attributed to localized motion of non-bridging oxygens in the alkali-depleted region near the anode rather than to space charge or interfacial polarization, as proposed earlier. Although the high-temperature peak was dominant under medium polarizing conditions, it was swept away irreversibly by biasing at extremely high electric field.

Journal ArticleDOI
TL;DR: In this paper, a plasma-induced dissociation of Mo(CO)6 molecules is proposed for metallizing nonconductive objects, which is inexpensive with no sophisticated instrument needed, and allows us to deposit fine grained, adherent thin films of molybdenum on nonrefractory substrates.
Abstract: A simple technique is proposed for metallizing nonconductive objects. The technique, which is based on a plasma-induced dissociation of Mo(CO)6 molecules, is inexpensive with no sophisticated instrument needed, and allows us to deposit fine grained, adherent thin films of molybdenum on nonrefractory substrates. It is believed that the technique possesses a variety of potential applications in laboratory works.

Journal ArticleDOI
TL;DR: In this paper, the hardness of NbB2 and TaB2 single crystals was measured in the temperature range 20-1100°C on the (0001) plane in the 〈1010〉 and à 1120〉 indentation directions and on the {1010} plane in à 1210 à and [0001] directions.
Abstract: The high temperature Knoop hardness of NbB2 and TaB2 single crystals was measured in the temperature range 20–1100°C on the (0001) plane in the 〈1010〉 and 〈1120〉 indentation directions and on the {1010} plane in the 〈1210〉 and [0001] directions. In every case the hardness value H decreased monotonically with increasing temperature, but the H-T curves all showed a step at around 0.3T/Tm where Tm is the melting temperature, suggesting a change in the deformation mechanism at this temperature. At all temperatures the inequalities H 〈10 1 0〉(0001) > H 〈11 2 0〉(0001) and H 〈1 2 10〉{10 1 0} > H [0001]{10 1 0} were obtained for NbB2 and TaB2. This hardness anisotropy indicates that slip was mainly on the prismatic system and this was confirmed by slip line observations.