Showing papers by "Nagoya Institute of Technology published in 1980"
01 Jan 1980
TL;DR: In this article, a semi-infinite plate with an oblique edge crack was analyzed as a thin plate bending problem and a plane elastic problem, and closed solutions were obtained for these respective problems.
Abstract: A semi-infinite plate with an oblique edge crack is analyzed as a thin plate bending problem and a plane elastic problem. The rational mapping function of the sum of fractional expressions and the complex variable method are used. Closed solutions are obtained for these respective problems. Stress distributions, stress intensity factors are investigated for loads causing transverse bending, twisting and uniform tension. The relations between the stress intensity factors and the angle of the oblique edge crack are also investigated.
111 citations
TL;DR: In this article, the effects of electrolytic bubbles on the IR drop of caustic soda solution in a vertical cell of one meter height were studied under both free and forced convection.
Abstract: Effects of electrolytic bubbles on the IR drop of caustic soda solution in a vertical cell of one meter height were studied under both free and forced convection. Three pairs of Luggin‐Haber probes were positioned near the anode and the cathode to determine the solution IR drop during electrolysis. A sectioned electrode having 10 segments was employed to obtain the current distribution from the bottom to the top of cell. The superficial resistivity of the solution containing gas bubbles agreed well with the Bruggemann equation. The solution IR drop decreased significantly when adequate conditions or cell geometry for solution circulation were provided. The anode‐to‐cathode gap was found to be the most important parameter for reduction of the solution IR drop in a vertical cell.
107 citations
93 citations
TL;DR: A detection algorithm for the first and the second heart sounds, which is one of the most important problems in an automatic diagnostic system for phonocardiograms, has been developed and is based on the frequency-domain characteristics of heart sounds analysed by a linear-prediction method.
Abstract: A detection algorithm for the first and the second heart sounds, which is one of the most important problems in an automatic diagnostic system for phonocardiograms, has been developed. It is based on the frequency-domain characteristics of heart sounds analysed by a linear-prediction method. The performance of the algorithm has been evaluated in 187 samples that contain 881 cardiac cycles including normal and abnormal subjects. The algorithm uses low frequency spectral tracking for the time series of the phonocardiogram. It can track spectral level smoothly so that it is fairly effective for the detection of heart sounds. This tracking procedure can be used in other applications such as electroencephalogram processing.
76 citations
TL;DR: In this article, structural changes during ageing in a range of Fe-Mo binary alloys (Fe-13 ~ 20at.%Mo) were investigated by means of TEM and X-ray diffraction.
66 citations
TL;DR: In this paper, a crack originating from a corner of a square hole is analyzed as a plane elastic problem and the rational mapping function of the sum of fractional expressions is used.
47 citations
TL;DR: In this article, surface recombination velocity S2 and diffusion coefficient D2 of the minority carrier in p-InxGa1-xAsyP1-y (0.650.74, 0.61
Abstract: Surface recombination velocity S2 and diffusion coefficient D2 of the minority carrier in p-InxGa1-xAsyP1-y (0.65
40 citations
TL;DR: In this article, the authors examined the structural properties of CaAl 2 O 4 with the stuffed tridymite structure under high temperatures (600 ∼ 1500 °C) and high pressures (10 ∼ 40 kb).
39 citations
TL;DR: In this paper, the effect of external column volume on apparent column efficiency is discussed using the peak width expressed in volume units, and the effect is very large for non-retained solutes, it decreases sharply for retained solutes.
36 citations
34 citations
TL;DR: In this article, a sealed teflon vessel is used to extract strontium, vanadium, and zirconium from standard silicate materials, including barium, cobalt, chromium, copper, lithium, nickel, and scandium.
TL;DR: In this paper, living poly(tetrahydrofuran) (PTHF) was coupled with sodium p-vinylbenzyloxide quantitatively to prepare a macromer of PTHF.
Abstract: Living poly(tetrahydrofuran) (PTHF) was coupled with sodium p-vinylbenzyloxide quantitatively to prepare a macromer of p-vinylbenzyloxyl poly(tetrahydrofuran) (VBO-PTHF). The radical polymerization of the macromer with AIBN was performed. From the GPC measurement the conversion of the macromer to poly-macromer was shown to be high percentage, but the degree of polymerization of poly-macromer was much lower than that expected in the case of regular monomers such as styrene.
TL;DR: In this article, eight elements in NBS-SRM 1577 bovine liver and other biological standards are determined by flame atomic absorption (Ca, Cu, Fe, Mg, Mn and Zn) and emission (K and Na) spectrometry.
TL;DR: The differences in the hypercapnic drive between untrained subjects and swimmers obtained here is discussed in connection with their maximum oxygen uptake.
Abstract: Ventilatory response lines to carbon dioxide at rest were determined by the rebreathing method in 10 untrained subjects, 17 sprint swimmers, and 11 long-distance swimmers. It was found that the mean slope of the ventilatory response line of the swimmer was lower than that of the untrained group, and the mean slope of the long distance swimmer was lower as compared with the sprint swimmer, though these differences were statistically not significant. The differences in the hypercapnic drive between untrained subjects and swimmers obtained here is discussed in connection with their maximum oxygen uptake.
TL;DR: In this article, simple simple shear tests were carried out using a pile of aluminium rods to simulate granular materials in a two-dimensional state, where the sliding displacements between two particles across the potential sliding plane were formulated by considering the mechanism of disappearance and generation of angles of interparticle contacts.
TL;DR: The teflon-lined bomb described in this paper is suitable for acid digestion of biological materials and total decomposition time with nitric and perchloric acids is 6 h. Blanks are low and results agree well with certified values.
TL;DR: In this article, the Laplace transform of the point-wise availability of the system and the steady state availability of system were derived by using the supplementary variable method, and the optimum inspection period was discussed to maximize the steady-state availability.
TL;DR: Kullback information is shown to be equivalent to the spectral error measure, which is developed to estimate the difference between two spectral densities and it is shown that sleep stages determined by the segmentation and the classification of the electroencephalogram data, are similar to those determined by a medical doctor.
Abstract: Kullback information plays an important role in measuring the discrepancy between two probability density functions. In this paper, first, Kullback information is shown to be equivalent to the spectral error measure, which is developed to estimate the difference between two spectral densities. Then, to divide the non-stationary electroencephalogram data into stationary subsequences, segmentations of the data during sleep are carried out by using the spectral error measure. Next, to classify the segmented electroencephalographic data into one of the classes of the template patterns, Kullback information is also computed. Here, Kullback information is used as a measure of the distance between the template pattern and the segmented one. Finally, it is shown that sleep stages determined by the segmentation and the classification of the electroencephalogram data, are similar to those determined by a medical doctor.
TL;DR: In this paper, an attempt has been made to predict the thermal expansion coefficients of particle-filled polymers in which particles have various types of orienta tion distributions based on Eshelby's theory and a kind of self-consistent method is introduced to estimate the effect of the orien tation distribution together with the interaction among particles.
Abstract: An attempt has been made to predict the thermal expansion coefficients of particle-filled polymers in which particles have various types of orienta tion distributions. The calculation is based on Eshelby's theory and a kind of self-consistent method is introduced to estimate the effect of the orien tation distribution together with the interaction among particles. The ex pression for the space random orientation of disk-shaped particles with infinitesimal aspect ratio, which is derived here, agrees with lower bound of isotropic composites predicted by Schapery. The calculated results are also compared with existing experimental data for glass particle-epoxy resin composites, and these are almost in good agreement.
TL;DR: In this paper, the inner walls of capillary tubing were formed with aluminium oxide powder, and then the tubing was drawn into a micro-capillary column for further treatment with octadecylsilane.
TL;DR: In this article, a 2,2'-Dipyridyl-2-quinolylhydrazone (DPQH) was proposed as a Spectrophotometric reagent for certain metal ions.
TL;DR: In this paper, a dendritic configuration growth at the tip area of a pointed cathode when operated in an Mo(CO)6 or Cr(CO 6 atmosphere at a field strength just insufficient to draw field electrons is described.
Abstract: A cathodic needle growth which is possibly associated with the temperature-field (T-F) electron emission is described Experimental data disclosed that densely populated needle crystals exhibiting a dendritic configuration growth at the tip area of a pointed cathode when it is operated in an Mo(CO)6 or Cr(CO)6 atmosphere at a field strength just insufficient to draw field electrons The needle growth occurs always at elevated temperatures of ∼600–∼700 K, indicating that it is triggered by T-F electrons emitted from the cathode tip Needle crystals produced are not single crystals but composed of linearly packed micro-crystals, and those crystals obtainable from Mo(CO)6 are a face-centered cubic phase of Mo2C Needles arising from Cr(CO)6 have not been identified, but they are believed to be an unknown phase of chromium carbide
TL;DR: The growth of the crystallites occurred predominantly at peripheries of the particles at 500°C and in the whole particles at 600°C, resulting in crystallites of 160-360 A in diameter at 800°C.
TL;DR: In this article, the growth mechanism of needle growth on a tungsten substrate biased at a negative potential in a temperature range from ∼300 to 1500 K is discussed, and the products are grouped into three categories depending on their growth temperature: (1) W particles agglomerated in dendritic shapes, produced at ∼300-1100 K, (2) W whiskers oriented, formed at ∼1100-1450 K, and (3) whishers of W2C, at ∼1450-1500 K.
TL;DR: In this article, a self controlling mechanism is suggested which draws ions preferably to the top of the growing tungsten needles, which can also trigger the deposit of neutral Tungsten atoms on the needles.
Abstract: The mechanism of the recently discovered growth of tungsten needles by vapourphase deposition of tungsten in high electric fields is discussed. The process consists of microneedle growth on a cathode producing an electric discharge by decomposition of hexacarbonyltungsten under high-field conditions. A self controlling mechanism is suggested which draws ions preferably to the top of the growing tungsten needles. The ions can also trigger the deposit of neutral tungsten atoms on the needles. The process is not restricted to tungsten, but can be used also for production of a variety of needles of different metals including alloys.
TL;DR: In this article, carbon-13 NMR chemical shifts were measured on solutions of dodecyldimethylammonium chloride (DDAC) at various concentrations in the absence of added salt.
TL;DR: In this paper, vanadium-EDTA complex is applied to the determination of microgram amounts of EDTA in 2-amino-4-methylphenol, and EDTA can be determined accurately in the concentration range between 0.015 and 0.29 μg ml−1.
TL;DR: Three terdentate hydrazones, all containing the 1-phthalazino grouping in the hydrazine moiety but differing in the heterocyclic substituent in the aldehyde moiety, have been used as analytical reagents for palladium(II) in the presence of chloride ions being deduced as discussed by the authors.
TL;DR: In this paper, a cellulose acetate membrane was used to measure the permeability of a binary vapor mixture through a cellulosic membrane using water and methyl alcohol mixed vapor.
TL;DR: In this article, the spin trapping method was applied to the study of local molecular motion in polyethylene and the free radicals produced by γ-irradiation and thermal degradation were stably trapped by spin trapping reagent.