Showing papers by "Chiba Institute of Technology published in 1986"
TL;DR: It is verified that the precision of atmospheric temperature measurement with a high spectral resolution lidar system under construction is feasible for practical use.
Abstract: Following the suggestion of Young and Kattawar, we used the S6 model to recalculate Rayleigh-Brillouin spectra of nitrogen and the required measurement time for a high spectral resolution lidar (HSRL) which we proposed for atmospheric parameter measurements. As expected, the calculated sensitivity for atmospheric temperature using this model and a simpler SM model previously used is nearly the same. In this paper, the procedures for selecting the optimum temperature for an atomic vapor filter as well as for error analysis and sensitivity estimation were carried out. It is verified that the precision of atmospheric temperature measurement with a HSRL system under construction is feasible for practical use.
53 citations
TL;DR: In this article, the first drawing was carried out in a usual and mechanical process and followed by the reverse drawing in which specimens are subjected to hydraulic counter pressure on the punch bottom part and peripheral rim.
39 citations
TL;DR: In this paper, the effect of zinc oxide encapsulated in polystyrene (C-St-ZnO) was studied concerning its effect on photoconductivity and it was observed that the light sensitization effect was increased in proportion to an increase of the encapsulation ratio.
Abstract: Zinc oxide encapsulated in various polymers was studied concerning its effect on photoconductivity. Consequently, zinc oxide encapsulated in polystyrene (C-St-ZnO) showed a marked light sensitization effect. Further, the tendency was observed that the light sensitization effect was increased in proportion to an increase of the encapsulation ratio. Furthermore, in the composite films of C-St-ZnO and polystyrene, the film in which 5% of polystyrene is blended showed a remarkable light sensitization effect. Some studies were carried out with respect to the light sensitization mechanism of this encapsulated zinc oxide by examining the dark current property and the initial rising rate of the sensitized photocurrent.
Die Photoleitfahigkeit von mit verschiedenen Polymeren umhulltem Zinkoxid wurde untersucht. Mit Polystyrol behandeltes Zinkoxid (C-St-ZnO) zeigte einen ausgepragten Lichtsensitivierungseffekt. Weiterhin wurde beobachtet, das die Sensitivierung proportional zur Erhohung des Einkapselungsverhaltnisses ansteigt. Bei den Filmen von Mischungen aus C-St-ZnO und Polystyrol zeigte der mit 5% Polystyrol einen bemerkenswerten Sensitivierungseffekt. Zusatzlich wurden Untersuchungen bezuglich des Sensitivierungsmechanismus des Zinkoxids durch Bestimmung des Dunkelstroms und der Anstiegsgeschwindigkeit des Photostroms untersucht.
27 citations
TL;DR: Ezomycins were discovered in a fermentation beer of Streptomyces species as antibiotics, which consisted of aminoocturonic acid, aminoglucuronic acids and base as discussed by the authors.
Abstract: Ezomycins were discovered in a fermentation beer of Streptomyces species as antibiotics, which consisted of aminoocturonic acid, aminoglucuronic acid and base As a part of a total synthesis of ezomycins, the title compounds have been synthesized A KF-catalyzed Henry reaction between a nitropentose and a glyceraldehyde derivative gave a nitro alcohols mixture Hydrogenation of the intact mixture, followed by N-acetylation afforded three diastereomers The absolute configurations of the newly-introduced chiral centers were established by chemical methods and a X-ray crystal structure analysis
25 citations
TL;DR: In this article, a film complex of alcool polyvinylique, chlorure cuivrique comme polymere de base was used for phase vapeur, utilisant un film complexe alcoolpolyvinyliqué, chlorore cuivique, and polymerane de base.
Abstract: Preparation par polymerisation en phase vapeur, utilisant un film complexe alcool polyvinylique, chlorure cuivrique comme polymere de base
17 citations
TL;DR: Reponses du champ magnetique et du plasma a des mouvements de masse localement convergents ou divergents pres de la ligne neutre magnetique photospherique as discussed by the authors.
Abstract: Reponses du champ magnetique et du plasma a des mouvements de masse localement convergents ou divergents pres de la ligne neutre magnetique photospherique
16 citations
TL;DR: In this paper, the 3'-terminal nonanucleotide, U-U-C-A-A.C-C.A-C, was obtained by the block condensation of trimers.
13 citations
TL;DR: Vertical distribution of bacteria in Lake Vanda, an Antarctic meromictic lake, was examined by the acridine orange epifluorescence direct count method and mean bacterial cell volume was fairly large compared with common bacterial populations in seawater and lake water.
Abstract: Vertical distribution of bacteria in Lake Vanda, an Antarctic meromictic lake, was examined by the acridine orange epifluorescence direct count method Total bacteria were 104–105 cells · ml−1 in the water at 55 m depth and above, and increased drastically to 107 cells · ml−1 in the bottom water Filamentous or long rodshaped bacteria occurred at a high frequency in the upper layers, but in the bottom layers most bacteria were coccoidal or short rods Mean bacterial cell volume in water of between 10 m and 60 m deep was fairly large compared with common bacterial populations in seawater and lake water Aerobic heterotrophic bacteria were recovered from the water of a depth of 30 m and above, and were assumed to belong to Caulobacter Viable heterotrophic bacteria were not recovered from the high salinity deep water by media prepared with the same deep water Phototrophic purple non-sulphur bacteria were isolated by enrichment cultures from water at 55 m depth
13 citations
TL;DR: The 2', 5'-adenylate trimer, A2'p5'A2' p5'HOA (10a) was found to have a less stacked structure than the 2', 7-bromo- or 8-hydroxyadenosine trimer (10b) and some properties of these compounds were studied by circular dichroism (CD) spectroscopy.
Abstract: Trimers of 2', 5'-oligoadenylic acids bearing 2'-terminal 8-bromo- or 8-hydroxyadenosine have been synthesized by the phosphotriester method. Some properties of these compounds were studied by circular dichroism (CD) spectroscopy. The 2', 5'-adenylate trimer, A2'p5'A2'p5'HOA (10a) was found to have a less stacked structure than the 2', 5'-adenylate trimers A2'p5'A2'p5'BrA (11) and A2'p5'A2'p5'A (10b).
12 citations
TL;DR: Two of the five possible geometrical isomers of [RhCl2(edpp)2]- were formed by reaction of rhCl3·2H2O with edpp (edpp=(2-aminoethyl)diphenylphosphine) in 1:2 molar ratio in ethanol as discussed by the authors.
Abstract: Two of the five possible geometrical isomers of [RhCl2(edpp)2]+ were formed by reaction of RhCl3·2H2O with edpp (edpp=(2-aminoethyl)diphenylphosphine) in 1:2 molar ratio in ethanol. The chlorides of the isomers were separated by fractional crystallization from ethanol. The structures of the more soluble (main product) and the less soluble (minor product) complexes were determined by X-ray analyses to have the trans(Cl,Cl), cis(P,P) and cis(Cl,Cl), trans(P,P) configurations, respectively. Crystal data are: for trans(Cl,Cl), cis(P,P)-[RhCl2(edpp)2]Cl·2C2H5OH, triclinic, space group P\bar1, with a=10.024(3), b=18.865(3), c=9.833(2) A, α=97.66(1), β=103.92(2), γ=82.30(2)°, and Z=2, and for cis(Cl,Cl), trans(P,P)-[RhCl2(edpp)2]Cl·4H2O, triclinic, space group P\bar1, with a=11.341(4), b=17.780(6), c=8.712(3) A, α=95.60(4), β=112.31(3), γ=82.56(4)°, and Z=2. The trans influence of the P atom on the Rh–N and Rh–P bond lengths is observed. The mean Rh–N and Rh–P bond lengths (2.125(4) and 2.300(1)A) in the trans(C...
11 citations
TL;DR: Parameter identification in a process-model control system, in which the controller involves a model of the process, is presented and is based on an expression for the prediction of the controlled response as a linear function in the process parameters.
Abstract: Parameter identification in a process-model control system, in which the controller involves a model of the process, is presented. The identification is performed through using information about the difference between the actual and specified responses. The identification procedure is based on an expression for the prediction of the controlled response as a linear function in the process parameters, and based on successive solutions of a set of linear algebraic equations.
TL;DR: In this paper, the results show that the temperature dependencies of the physical properties have inflections near 180°C, which may suggest that the introduced nitrogen plays an important role in recombining the splitted denatured molecules and tightening the structure of the char.
Abstract: Rayon fabrics treated with ammonium sulfate were heated in the temperature range of 120 to 340°C in air and in nitrogen atmosphere, and the changes in the physical properties were investigated.The results show that the temperature dependencies of the physical properties have inflections near 180°C. In the range of 120 to 180°C, dehydration and depolymerization seem to mainly proceed, being accompanied with weight loss as well as decrease in tensile strength. However, above around 180°C, the different but noteworthy changes were observed, namely, 1) marked increase in tensile strength, 2) release of carbon and introduction of nitrogen, 3) loss of solubility and changes in density. These may suggest that the introduced nitrogen plays an important role in recombining the splitted denatured molecules and hence in tightening the structure of the char.Furthermore, an excellent flame-resistant fabric has been prepared by application of the procedure above mentioned. This fabric has a high L. O. I. value of 47, unmeltability, high hygro-scopicity and also excellent thermal and electrical insulatabilities, so that it seems to be useful in the fields where hazardous thermal environments exist.
TL;DR: In this paper, the yields and the tensile strength of charred rayon fabrics were measured using pyrolysed at 300°C in air, and the results were discussed in relation to the flameproofing mechanisms of cellulose.
Abstract: Rayon fabrics, untreated or treated with sulfur-containing acids, nitrogen-containing bases and their salts or mixtures, were pyrolysed at 300°C in air, and the yields and the tensile strengths of charred rayon fabrics were measured. For the comparison, the salts of phosphoric acid, hydrochloric acid or nitric acid were also examined as treating agents.All of the compounds investigated, except ammonium nitrate, act to increase yield of charred fabrics. On the other hand, the compounds remarkably increasing tensile strength of charred fabrics seem to be restricted to the combinations of following acids and bases; Acid: surfuric acid, sulfurous acid, sulfamic acid and thiosulfuric acid Base: ammonia, urea, guanidine triethanolamine and anilineThe results are discussed in relation to the flameproofing mechanisms of cellulose.
01 Jan 1986
TL;DR: Various anticorrosive treatments for Mg alloys, such as temporary protective coatings and paintings, have been developed as discussed by the authors, but the structure and compositions of the coated materials have not been satisfactorily clarified in previous reports.
Abstract: Various anticorrosive treatments for Mg alloys,such as temporary protective coatings and paintings,have been developed Treatment processes reported in the literature may be classified into chemical conversion process [1], electroplating process [2–4], and anodic coating process [5] Above all, anodized treatment is important to increase corrosion resistance of the Mg alloy, but structure and compositions of the coated materials have not been satisfactorily clarified in previous reports
TL;DR: In this article, an electron diffraction study presents an evidence for the dielectric suceptibility anomaly inferred from the temperature dependence anomaly of magnetocrystalline anisotropy constant of magnetite just below the Verwey transition point.
TL;DR: A case study of this analysis was carried out on Typhoon 7920 with regard to Chiba Prefecture as discussed by the authors, where the analysis of the topography of the surrounding area provided important data in analyzing wind disasters.
Abstract: It is well known that topography is an important factor that affects wind disasters, the wind on the ground surface that cause the damage to the structures being particularly affected by the topography of the surrounding area.This paper concerns research work on methods for estimating the distribution of wind force on the ground surface based on the analysis of topography, which furnishes important data in analyzing wind disasters.A case study of this analysis was carried out on Typhoon 7920 with regard to Chiba Prefecture.