Showing papers by "Nagoya Institute of Technology published in 1985"
TL;DR: In this article, the formation of calcium silicate hydrate (C-S-H) and its carbonation were investigated under two different atmospheric conditions, and the Ca/Si mole ratios of formed C-S -H have the approximately constant value of 1.2 and its mean solubility product is 5.5×10−49 at room temperature.
146 citations
TL;DR: In this article, the Matsuoka-Nakai (SMP) criterion is introduced as a failure criterion for granular materials (J1, J2 and J3): the first, second and third effective stress invariants).
88 citations
TL;DR: In this article, the effects of the nozzle diameter and volume ratio on the structure of the torch jet, ignition process, and subsequent burning process in the main chamber were minutely examined, in both uniform and stratified charges, by measurements of ion current, light emission, OH-emission (306.4 nm), initial torch jet velocity, and main chamber pressure histories and by schlieren photography.
81 citations
TL;DR: In this article, the morphological change of ogdoads in Ni-Al, Ni-Si and Nimonic 115 alloys was investigated by means of transmission electron microscopy.
80 citations
TL;DR: In this article, a method to describe the frictional behavior between soil and wall is firstly proposed using an elastoplastic joint element, and its validities are confirmed by analyzing the slip behavior between two solid elements.
73 citations
TL;DR: In this paper, an experimental investigation was performed on propane-air flames stabilized by cylindrical rod bluff-bodies when the number and diameter of rods were changed under a constant blockage ratio of 0.4.
70 citations
TL;DR: In this paper, the synthesis of thermal-shock-resistant material from zirconyl phosphate, 2ZrO2P2O5, was investigated; only the a phase appears to be thermodynamically stable.
Abstract: The synthesis of thermal-shock-resistant material from zirconyl phosphate, 2ZrO2P2O5, was investigated. Modifications of the compound were examined; only the a phase appears to be thermodynamically stable. Sintering of a-phase powder to a dense ceramic was promoted by adding a metal oxide. Crystalline zirconyl phosphate has a low average thermal expansion coefficient. The relation of microcracking to grain size and strength was studied using specimens sintered under varied conditions. A strong low-thermal-expansion polycrystalline ceramic was obtained by controlling grain growth.
50 citations
TL;DR: A method for the on-column preparation of chemically bonded stationary phase with monofunctional reagents was studied in conventional stainless-steel columns and in glass capillary columns for packed microcapillary chromatography as mentioned in this paper.
50 citations
TL;DR: A new advanced system of daylight prediction has been developed and presented by the authors for the highest utilization of natural daylight and appropriate saving of the electrical power consumed by the artificial lighting in daytime.
Abstract: A new advanced system of daylight prediction has been developed and presented by the authors for the highest utilization of natural daylight and appropriate saving of the electrical power consumed by the artificial lighting in daytime. Though the research works for this system and for the Mean Sky upon which it is based have already been published4)∼11), one of the most essential parts of the research work, that is, the framing of the Intermediate Sky and its detailed contents have been only presented in a brief paper in Japanese.8) The Intermediate Sky was framed mainly from the current materials which had already been gathered by the authors before starting of the research work, as the measurement to be required for the establishment of the Intermediate Sky should be carried out for a very long time. The procedure of framing the Intermediate Sky and its results are stated in this paper.
48 citations
TL;DR: Differences of emission spectra between compounds and glasses of similar compositions are rather small, but some enhancement of the contribution of antibonding states to the PDOS near ${E}_{F}$ is suggested for certain glasses over that of the corresponding compounds.
Abstract: Valence electronic structures of crystalline compounds and glassy alloys of Ni silicides, Pd silicides, and Ni borides are studied by soft-x-ray spectroscopy over wide ranges of Si and B concentrations. The samples prepared include bulk compounds, glassy ribbons, and amorphous sputtered films. Silicon K\ensuremath{\beta} emissions of Ni and Pd silicides generally consist of a prominent peak fixed at \ensuremath{\approxeq}4.5 and \ensuremath{\approxeq}5.8 eV below the Fermi level ${E}_{F}$, respectively, with a shoulder near ${E}_{F}$ which grows and shifts toward lower energy with increasing Si concentration. The former is identified as due to Si p\char21{}like states forming Si 3p\char21{}Ni 3d or Si 3p\char21{}Pd 4d bonding states while the latter as due to the corresponding antibonding states. Ni ${L}_{3}$ and Pd ${L}_{3}$ emissions of these silicides indicate that Ni 3d and Pd 4d states lie between the above two states. These local electronic configurations are consistent with partial-density-of-states (PDOS) calculations performed by Bisi and Calandra. Similar electronic configurations are suggested for Ni borides from B K\ensuremath{\alpha} and Ni ${L}_{3}$ emissions. Differences of emission spectra between compounds and glasses of similar compositions are rather small, but some enhancement of the contribution of antibonding states to the PDOS near ${E}_{F}$ is suggested for certain glasses over that of the corresponding compounds. These features are discussed in connection with the compound stability and glass formability.
47 citations
TL;DR: The existence of Hadamard matrices of order 268 is established and the existence of Baumert-Hall arrays of order 335, and 603 is established as well.
Abstract: The existence of Hadamard matrices of order 268 is established. More generally, suppose that there exist Williamson matrices of orderr. It is shown that this implies the existence of a Hadamard matrix of order 268r. The existence of Baumert-Hall arrays of order 335, and 603 is established as well.
TL;DR: Amorphous red phosphorus formed in reduced phosphate glasses was found to show a photodarkening effect by illuminating the glasses with light approximately equivalent to its absorption edge; the optical transmission edge shifts toward longer wavelengths on illumination, and then a distinct deepening of the reddish color is observable visually as mentioned in this paper.
Abstract: Amorphous red phosphorus formed in reduced phosphate glasses was found to show a photodarkening effect by illuminating the glasses with light approximately equivalent to its absorption edge; the optical transmission edge shifts toward longer wavelengths on illumination, and then a distinct deepening of the reddish color is observable visually. The photo-darkened specimen recovers its original transmission when it is heated at 300° to 350°C. This darkening-restoring process is confirmed to be reversible by repeated illumination and heating. Transmission measurements over a range of elevated temperatures suggest that this optical characteristic of red phosphorus is unique to its amorphous state.
TL;DR: In this article, Lanthanum/alizarin complexone (1:1) in 70% acetone was used in conjunction with a 500-cm reaction coil at 60°C to determine 0.03 −1.2 mg l−1 fluoride at 24 samples per h.
TL;DR: In this article, macromers obtained were polytetrahydrofuran-, polystyrene-, polyisoprene-, and poly(2-vinylpyridine)-macromers.
Abstract: Monodisperse and pure macromers were synthesized by means of living polymers of cationic and anionic polymerizations The macromers obtained were polytetrahydrofuran-, polystyrene-, polyisoprene-, and poly(2-vinylpyridine)-macromers The radical homopolymerizations of these macromers were performed, and the high reactivity of the macromers was revealed The radical copolymerizations of macromers with common small monomers were performed and r1 and r2 values were estimated The radical copolymerizations between two kinds of macromers were carried out to prepare a unique double-colored multibranch-polymer
TL;DR: In this paper, the structure of base consiste en cycles a six membres plisses (avec la symetrie de groupe ponctuel 3m) de tetraedres silicate: [Si 6 O 18 ] 12−. Les cycles sont empiles selon le mode cubique compact and maintenus ensemble par les ions Na + et Ca 2+ localises sur quatre positions distinctes.
Abstract: Na 6 Ca 3 [Si 6 O 18 ] cristallise dans R3m avec a=7,488 A, α=89,04°, Z=1 (ou a=10,500 et c=13,184 A, Z=3); affinement jusqu'a R=0,042. La structure de base consiste en cycles a six membres plisses (avec la symetrie de groupe ponctuel 3m) de tetraedres silicate: [Si 6 O 18 ] 12− . Les cycles sont empiles selon le mode cubique compact et maintenus ensemble par les ions Na + et Ca 2+ localises sur quatre positions distinctes
TL;DR: In this article, a method for the extractive spectrophotometric determination of palladium(II) with di-2-pyridyl ketone benzoylhydrazone (DPKBH) has been studied.
Abstract: A method for the extractive spectrophotometric determination of palladium(II) with di-2-pyridyl ketone benzoylhydrazone (DPKBH) has been studied. The method is based on the formation of the palladium(II)-DPKBH complex which is extracted into benzene from sulfuric acid solution in the presence of chloride ions. The extracted species has absorption maxima at 455 and 481nm with the molar absorptivity of 9.38×103 Lmol-1 cm-1 at the former wavelength. Beer′s law is obeyed over the range 0-10μg ml-1 of palladium at 455nm. The proposed method is selective in the presence of tartaric or citric acid and has been satisfactorily applied to the determination of palladium in a dental alloy and in palladium-catalyst samples.
TL;DR: In this article, 2-Alkyl-1(2-formylphenyl-N-alkyliminomethyl)isoindoles were prepared by the reaction of o-phthaldehyde with primary amines in 99% ethanol at 0°.
TL;DR: In this article, γ-dicalcium silicate was formed as an initial product from mixtures of lime with silicic acid or finely divided quartz at Ca/Si = 1.5 -3.0 above 220°C under saturated steam pressures using a rapid heating method, in which water is not admitted into the reaction vessel until the working temperature has been reached.
TL;DR: In this article, the P4+ center having fourfold coordination was observed in the as-irradiated (77 K) glasses, which indicated that P3+ occurs to a significant extent in the glass.
Abstract: Gamma-induced paramagnetic defects centered on phosphorus ions were investigated by ESR for binary phosphate glasses. The P4+ center having fourfold coordination was observed in the as-irradiated (77 K) glasses. On thermal annealing, this center was found to be converted into P4+ with threefold coordination, which is an analog of Si E′-center. In the glasses melted under strongly reducing conditions, the P(II)O22− center having nearly C2v symmetry was detected, this fact indicating that P3+ which is the precursor of P2+ occurs to a significant extent in the glass. The results obtained were compared with those for As which has an electronic configuration analogous to that of P.
TL;DR: The catalytic activity of copolymers containing styrene units is generally higher than that of homopolymers as mentioned in this paper, and the binding ability increases with increasing density of active sites.
Abstract: Soluble polymeric sulfoxides were prepared by free-radical polymerization of methyl 4-vinylphenyl sulfoxide and methyl 4-vinylbenzyl sulfoxide, and copolymerization of these monomers with styrene. These polymers serve as effective phase transfer catalysts for several reactions under liquid-liquid biphase conditions. The catalytic activity of copolymers containing styrene units is generally higher than that of homopolymers. On the other hand, copolymers with acrylonitrile co-units do not exhibit catalytic activity. It was found that polymeric sulfoxides extract all alkali metal cations examined here more efficiently than their monomeric analogs, and that the binding ability increases with increasing density of active sites, suggesting a cooperative effect of sulfoxide groups. It is reasonable therefore to assume that the catalytic activity is due to both cation binding on the polymers and activation of the anions caused by desolvation in the hydrophobic region of the polymers.
TL;DR: In this paper, the authors discuss des effets de l'ecrouissage, des conditions de charge and des elements d'alliage sur le pic hydrogene du frottement interne dans les aciers inoxydables austenitiques.
TL;DR: An alternating copolymer of butadiene and a fluoroalkyl methacrylate homopolymer IIIf and its hydrogenated copolymers IIf were synthesized and identified in this article.
Abstract: An alternating copolymer of butadiene and a fluoroalkyl methacrylate If and its hydrogenated copolymer IIf were synthesized and identified. We designated these copolymers as widely-spaced comb-like polymers as we did the alkyl side chain copolymers in our previous paper [Polym. J., 15, 891 (1983)]. The fluoroalkyl methacrylate homopolymer IIIf is a brittle plastic but If and IIf are extensible elastomers. Although IIIf is soluble in benzotrifluoride only when warmed, If and IIf are soluble at room temperature. The cast films of If, IIf, and IIIf showed the same contact angles of water or n-alkane droplets. Differential scanning calorimetry study demonstrated the crystallization of the fluoroalkyl side chains of If and IIf in spite of their wide spaces. The fluoroalkyl side chains were found to be crystallizable more easily than the alkyl side chains of the same carbon atom numbers.
TL;DR: In this article, a semi-infinite plate with an oblique thin rigid body was analyzed as a mixed boundary value problem and a rational mapping function of a sum of fractional expressions was used.
01 Jan 1985
TL;DR: In this article, the design of state observers and stabilizing controllers for singularly perturbed discrete systems is studied and the duality between the observer problem and the eigenvalue assignment problem is discussed.
Abstract: The design of state observers and stabilising controllers for singularly perturbed discrete systems is studied in the paper. Noting the duality between the observer problem and the eigenvalue assignment problem, full-order observers are constructed by a systematic approach, which is based on time-scale decomposition concepts. By applying these results, stabilising problems for singularly perturbed discrete systems with inaccessible states are investigated. Finally, an application to a ninth-order boiler model is discussed.
TL;DR: The rotational energy levels of NH + 4 in dilute solution in KBr have been calculated for three possible orientations of a tetrahedral ion in an octahedral field as discussed by the authors.
Abstract: The rotational energy levels of NH + 4 in dilute solution in KBr have been calculated for three possible orientations of a tetrahedral ion in an octahedral field. Both tunneling and librational levels have been obtained. It is concluded that the inelastic neutron scattering spectra, which were reported in part I [J. Phys. Soc. Jpn. 52 (1983) 2401], are best accounted for on the basis of C 3v orientation of the NH + 4 ions on the cation lattice sites.
TL;DR: In this paper, a clear correlation was found between the intensities of the uv-induced optical absorption and the ESR signal of Al-OHC, showing that the color bleaching process is reversible when the illumination and heating cycles are repeated.
Abstract: Dopant-free calcium aluminate glasses are very sensitive to ultraviolet radiation; new optical absorption bands rapidly appear around 400 nm on illumination and are easily bleached when the glass is heated to >100° to 250°C. This coloringbleaching process is reversible when the illumination and heating cycles are repeated, A clear correlation was found between the intensities of the uv-induced optical absorption and the ESR signal of Al-OHC.
TL;DR: In this article, the effects of the functional form and the number of adjustable parameters of the mixing rules on VLE calculations were examined and it was found that functional form is less influential in VLE calculation than the adjustable parameters and that two adjustable parameters in the mixing rule are sufficient for practical applications.
TL;DR: In this paper, the existence of the amorphous phase was confirmed by X-ray diffraction, transmission electron microscopy, calorimetric and electrical resistivity measurements.
Abstract: A new type AlTM amorphous alloy was produced by RF-sputtering under Ar atmosphere. The existence of the amorphous phase was confirmed by X-ray diffraction, transmission electron microscopy, calorimetric and electrical resistivity measurements. It was found that the amorphous phase is formed in the limited composition range of about 75 to 90 at.% Al and the formation of the amorphous phase in such a limited composition range is closely associated with the existence of several intermetallic compounds (Fe4Al13, FeAl6, Co4Al13, Co2Al9, NiAl3) in nearly the same composition range having a crystallographically complex structure. The crystallization temperatures of the amorphous alloys are 360°C, 260°C and 220°C for AlFe, AlCo and AlNi alloys, respectively.
TL;DR: In this paper, field-induced silver injection as well as lithium conduction occured and increased the TSPC slope from that of the gold-anode samples, with an emphasis on the comparison experiments between gold and silver electrodes.
Abstract: The objective of this work was to study field-induced silver injection into Li2O · 2SiO2 glass by the techniques of secondary ion mass spectrometry and thermally stimulated polarization/depolarization current (TSPC/TSDC), with an emphasis on the comparison experiments between gold and silver electrodes. For both anode materials, accumulation of lithium was found near the cathode. The blocking nature of the gold anode was demonstrated by the closeness of the observed and estimated width of the alkali-depleted region near the anode. For silver-anode samples, field-induced silver injection as well as lithium conduction occured and increased the TSPC slope from that of the gold-anode samples.