Showing papers by "Waseda University published in 1984"
TL;DR: A chaotic attractor with a 3-segment piecewise-linear resistor has been observed in this article, which is the first one to have interesting structures that are different from Lorenz's and Rossler's.
Abstract: A chaotic attractor has been observed with an extremely simple autonomous circuit. It is third order, reciprocal and has only one nonlinear element; a 3-segment piecewise-linear resistor. The attractor appears to have interesting structures that are different from Lorenz's and Rossler's.
611 citations
TL;DR: This paper proposes a heuristic algorithm named CP/MISF (critical path/most immediate successors first) and an optimization/approximation algorithm named DF/IHS (d thfirst/implicit heuristic search) which can reduce markedly space complexity and average computation time.
Abstract: This paper describes practical optimization/ approximation algorithms for scheduling a set of partially ordered computational tasks onto a multiprocessor system so that the schedule length will be minimized. Since this problem belongs to the class of ''strong'' NP-hard problems, we must foreclose the possibility of constructing not only pseudopolynomial time optimization algorithms but also fully polynomial time approximation schemes unless P = NP. This paper proposes a heuristic algorithm named CP/MISF (critical path/most immediate successors first) and an optimization/approximation algorithm named DF/IHS (d thfirst/implicit heuristic search). DF/IHS is an excellent scheduling method which can reduce markedly space complexity and average computation time by combining the branch-and-bound method with CP/MISF; it allows us to solve very large scale problems with a few hundred tasks. Numerical examples are included to demonstrate the effectiveness of the proposed algorithms.
480 citations
TL;DR: To control the release of insulin in response to the concentration of glucose, a glucose–responsive polymer membrane was designed by combining a glucose oxidase (GOD) immobilized membrane, a sensor for glucose, with a poly(amine) membrane which regulates the permeation rate of insulin.
Abstract: To control the release of insulin in response to the concentration of glucose, a glucose–responsive polymer membrane was designed by combining a glucose oxidase (GOD) immobilized membrane, a sensor for glucose, with a poly(amine) membrane which regulates the permeation rate of insulin. The permeability of insulin was increased by the addition of glucose. Gluconic acid produced by an enzymatic reaction between GOD and glucose induced a decrease in the pH value of the medium. This caused the protonation of tertiary amino groups in the membrane resulting in an increase in the water content of the poly(amine) membrane. The permeability of insulin through a complex membrane thus increases with glucose concentration.
235 citations
216 citations
TL;DR: In this paper, a copolymere par polycondensation de dimethyldichlorosilane avec le mono-, di-, tetra-, ou nonaethyleneglycol was presented.
Abstract: Preparation du copolymere par polycondensation de dimethyldichlorosilane avec le mono-, di-, tetra-, ou nonaethyleneglycol
155 citations
TL;DR: A high-efficiency diffraction grating called a fiber grating is proposed, which is composed of many optical fibers arrayed as a monolayer, which can emit several tens of beams with uniform intensities over a wide angle.
Abstract: In this paper, we propose a high-efficiency diffraction grating called a fiber grating, which is composed of many optical fibers arrayed as a monolayer. When a laser beam is irradiated perpendicularly onto the grating, the device can emit several tens of beams with uniform intensities over a wide angle. Crossed fiber gratings can produce 2-D spot arrays. The application in multiple imaging is demonstrated.
92 citations
TL;DR: In this article, a photoinduced change in the swelling degree of water was investigated and was found to be caused by photoisomerization of the azobenzene moiety in the polymer membrane.
Abstract: To control the swelling of polymer membrane by photoirradiation amphiphilic azoaromatic polymer membranes were prepared and a photoinduced change in the swelling degree of water was investigated. The azobenzene moiety in the side chain of the polymer was isomerized from trans form to cis form by ultraviolet (UV) irradiation and reverse isomerization was found by visible light irradiation. The swelling degree of the polymer membrane for water in the dark was decreased by UV radiation, and when visible light irradiation was carried out in the polymer membrane the degree of swelling recovered to the original level. The swelling degree decreased with an increase in the mole fraction of the azobenzene moiety in the dark and under UV irradiation. The deswelling degree of the polymer membrane by UV irradiation also decreased with an increase in the mole fraction of the azobenzene moiety. This reversible change in the swelling degree was considered to be caused by the photoisomerization of the azobenzene moiety in the polymer membrane.
83 citations
TL;DR: In this article, the effects of triethylamine (TEA) on the release of a water-soluble organic substance in an aqueous medium were investigated, and the effect of TEA was attributed to the formation of a charge transfer complex between the dinitrophenyl group in the polymer membrane and the added TEA.
Abstract: In order to regulate the release of a water-soluble organic substance from a polymer device, an amphiphilic polymer membrane having a dinitrophenyl group was prepared and the effects of an amino compound on the release of such a substance in an aqueous medium were investigated. When the amino compound, triethylamine (TEA), was added to the medium, the release rate of methyl orange (MO) in solution from the polymer device increased; the same was noted with an increase in the concentration of TEA. However, on removal of the TEA from solution, the rate resumed its initial level of that in water. These results were explained by the change in the swelling degree of the polymer membrane induced by the addition of TEA. This change was considered to result from the formation of a charge transfer complex between the dinitrophenyl group in the polymer membrane and the added TEA, since a charge transfer spectrum was observed in the polymer membrane–TEA system.
78 citations
TL;DR: The results indicated the use of the poly(ethylene glycol)-coupled IgG as an intravenous preparation and also as an additive stabilizing intact IgG for intravenous use.
67 citations
61 citations
TL;DR: In this paper, a montmorillonite-polyacrylonitrile intercalation compound was heated inflowing N2 using intercalated polyacanitrile as a reducing agent.
Abstract: To develop a new type of carbothermal reduction for the preparation of nitrides, a montmorillonite-polyacrylonitrile intercalation compound was heated inflowing N2 using intercalated polyacrylonitrile as a reducing agent. Nitridation occurred at >1150°C, and β-sialon was obtained, with the formation of β-Sic and AlN.
TL;DR: In this article, a flow system at 200°C, using montmorillonite intercalated by aluminium chlorohydroxyl complex (Al-mont) as a catalyst was investigated for disproportionation of 1,2,4,5-tetramethylbenzene and o-xylene.
TL;DR: In Salmonella typhimurium, 27 fla genes responsible for formation of flagella have been identified and assigned to three regions on the genetic map, termed fla regions I to III, and the flaW, flaV and flaX genes were shown to be functionally homologous with flaS, flbC andFlaP of Escherichia coli, respectively.
Abstract: Summary: In Salmonella typhimurium, 27 fla responsible for formation of flagella have been identified and assigned to three regions on the genetic map, termedfla regions I to III. By genetic analysis of 1984 non-flagellate mutants obtained from a phase-1 stable strain of S. typhimurium, SJW 1103, three additional fla genes were identified; one, termed flaW, was assigned to fla region I and the other two, termedflaV andflaX, toflaA region III. By intergeneric complementation tests, the flaW, flaV and flaX genes were shown to be functionally homologous with flaS,flaC and flaP of Escherichia coli, respectively. Electron microscopy showed thatflaW and flaV mutants carried hook-basal body structures.
TL;DR: In this article, the I.r. Raman spectra of five tartrate crystals, Na2C4H4O6·2H2O, NaKC4H 2O 6· 4H 2
TL;DR: In this article, the authors investigated the redistribution of implanted As during Ni2Si formation at 275 and 300°C and NiSi formation with NiSi at 400 to 700°C with neutron activation analysis and Hall effect measurement.
Abstract: We have investigated the redistribution of implanted As during Ni2Si formation at 275 and 300 °C and NiSi formation at 400 to 700 °C with neutron activation analysis and Hall effect measurement. Some of the implanted As atoms were found to redistribute themselves near the silicide‐Si interface during both Ni2Si and NiSi formation. The depth of the redistribution extends about 100 A into Si and is affected slightly by the formation temperature of NiSi. A fraction of the redistributed As is electrically active and the fraction increases with the annealing temperature. The maximum electrical activity of redistributed As during NiSi formation at 700 °C is estimated to be 6.5%.
TL;DR: Insulin Permeation through Amphiphilic Polymer Membranes Having 2-Hydroxyethyl Methacrylate Moiety is studied for its role in insulin resistance and its application in wound healing.
Abstract: Insulin Permeation through Amphiphilic Polymer Membranes Having 2-Hydroxyethyl Methacrylate Moiety
TL;DR: Le polymere amphiphile, azoaromatique est prepare par introduction d'un groupe azobenzene dans la chaine laterale de polymethacrylate d'hydroxyethyle as mentioned in this paper.
Abstract: Le polymere amphiphile, azoaromatique est prepare par introduction d'un groupe azobenzene dans la chaine laterale de polymethacrylate d'hydroxyethyle
TL;DR: In this article, the methode de quantification stochastique a un systeme dynamique decrit par un lagrangien regulier sous contraintes holonomes additionnelles.
Abstract: On etend la methode de quantification stochastique a un systeme dynamique decrit par un lagrangien regulier sous contraintes holonomes additionnelles
TL;DR: In this article, a comparison of titania-supported Ru catalysts and alumina-supported catalysts was made for hydrogenation of carbon monoxide (F-T) and hydrogen methanation.
TL;DR: In this paper, the standard molar Gibbs free energies of formation of Mg 2 SiO 4 (s) and MgSiO 3 (l) from SiO 2 and mgO(s) at 1973 K were determined to be −(55.7 ± 0.5) kJ · mol −1 and −(35.5 ± 0
TL;DR: The copolymeric catalyst suffers from the same instability exhibited by monomeric iron porphyrin catalysts in the presence of hydrogen peroxide that is generated as an intermediate in the reduction of dioxygen as mentioned in this paper.
TL;DR: A new software program PPINC (i.e., Process Planning by Information Concept) has been developed and shown to be a useful tool in actual process planning.
Abstract: The minimum information axiom is extended to process planning by developing a means of measuring the information in various processes and for various production parameters. The theory presented here deals with the probabilistic data involved in manufacturing machines and processes realistically and rationally. A new software program PPINC (i.e., Process Planning by Information Concept) has been developed and shown to be a useful tool in actual process planning.
TL;DR: In this paper, the ionic conductivity of polyanions with perfluoro-poly(electrolytes) was established at room temperature without affecting the processibility and flexibility of resulting hybrid films.
TL;DR: A meso-5,10,15,20tetra(o-pivalamidophenyl)porphyrinatoiron(II) complex of a 2-methylimidazole, substituted in the 1-position with a hydrophobic group, was incorporated into a lipid bilayer of phosphatidylcholine (liposomal heme) as discussed by the authors.
Abstract: A meso-5,10,15,20-tetra(o-pivalamidophenyl)porphyrinatoiron(II) complex of a 2-methylimidazole, substituted in the 1-position with a hydrophobic group, was incorporated into a lipid bilayer of phosphatidylcholine (liposomal heme). The liposomal heme reversibly bound molecular oxygen in neutral aqueous media at 37 °C, and the half-life of the oxygen adduct was half a day. The oxygen-binding affinity (p½) for the liposomal heme was ca. 50 mmHg, which is similar to that of hemoglobin in blood. The incorporation and structure of the liposomal heme were confirmed by physico-chemical methods, which indicated that the hydrophobic environment of the inner region of liposome protected the oxygen adduct from its proton-driven oxidation.
TL;DR: In this article, the corrosion behavior of ultrafine grained AISI 304 steel was investigated in various corrosive e... ing conditions, including low temperature recrystallization after subzero working.
Abstract: Ultrafine grained AISI 304 steel was produced by low temperature recrystallization after subzero working, and the corrosion behavior of these steels was investigated in various corrosive e...
TL;DR: Reversible "cold cataract" phenomenon of a SD-strain rat lens was studied by Raman spectroscopy, and the intensity ratio of the tyrosine doublet band provides a practical indicator of phase transition temperature of coldCataract.
TL;DR: Aldosterone seems to play no direct role in emergence from water after aquatic breeding activity in spring, as plasma levels showed no significant change during this season, and high summer levels of aldosterone and increases in live weight were correlated.
TL;DR: In this paper, the authors summarized the recent investigations on palygorskite and sepiolite from Japan are summarized in relation to their mode of occurrence and mineral genesis.
Abstract: Recent investigations on palygorskite and sepiolite from Japan are summarized in relation to their mode of occurrence and mineral genesis. Description of the Japanese palygorskites has been confined to only two specimens from the Kuzuu district, represented by “karst region” where a thick sequence of carbonate rocks crops out extensively. These two palygorskites occur along fissures or faults as fillings and are considered to have been formed by direct precipitation from an aqueous solution at earth-surface temperature. The solution rich in silica and magnesium with lesser amount of aluminium, resulted from the descent of meteoric water. Japanese sepiolites, on the other hand, show various modes of occurrence, and may be classified largely into four groups on the basis of their mode of occurrence; (1) sepiolite in serpentinite, (2) sepiolite associated with metallic mineral deposits, (3) sepiolite from the “karst region”, and (4) sepiolite (iron-rich variety) in Tertiary sediments. The sepiolites are considered to be of either hydrothermal or supergene origin, and to have been formed by direct crystallization from low-temperature hydrothermal solution and/or from supergene or marine water rich in silica, magnesium and other components. Palygorskite and sepiolite in Japan do not form sedimentary deposits of economical importance, and occur on a small scale. Intensive studies of clay mineral compositions in clay fractions of surface marine sediments in the oceans and seas in the environs of the Japanese Island Arc, have not confirmed so far the presence of palygorskite or sepiolite.