Showing papers by "Waseda University published in 1988"
Book•
28 Nov 1988TL;DR: This book contains various types of mathematical descriptions of curves and surfaces, such as Ferguson, Coons, Spline, Bzier and B-spline curves and surface, in a unified way so that beginners can easily understand the whole spectrum of parametric curve and surfaces.
Abstract: This book contains various types of mathematical descriptions of curves and surfaces, such as Ferguson, Coons, Spline, Bzier and B-spline curves and surfaces. The materials are classified and arranged in a unified way so that beginners can easily understand the whole spectrum of parametric curves and surfaces. This book will be useful to many researchers, designers, teachers, and students who are working on curves and surfaces. The book can be used as a textbook in computer aided design classes.
825 citations
TL;DR: This paper used American (Manchester, New Hampshire) and Japanese (Shizuoka) cohorts in 1910-1950 to explore the similarities and differences between "life-course transitions, " defined as the move.
Abstract: This study uses American (Manchester, New Hampshire) and Japanese (Shizuoka) cohorts in 1910-1950 to explore the similarities and differences between "life-course transitions, " defined as the move
146 citations
TL;DR: Palladium was deposited on a porous glass tube using a technique of electroless-plating as discussed by the authors, which exhibited a remarkable permeability to hydrogen and selectively separated hydrogen from H2-N2 and H2−CO gas mixtures through the composite membrane.
Abstract: Palladium was deposited on a porous-glass tube using a technique of electroless-plating. This composite membrane exhibited a remarkable permeability to hydrogen. Moreover, hydrogen was selectively separated from H2–N2 and H2–CO gas mixtures through the composite membrane.
124 citations
TL;DR: In this paper, the existence, uniqueness, regularity, and behavior of solutions to the initial-boundary value problem with zero-Dirichlet boundary condition and with nonnegative initial condition were studied in a bounded domain in R N, where β, γ, λ ⩾ 0 and p > 1.
123 citations
TL;DR: In this paper, the problem of determining the economic levels for the base stock and lead times for production and transportation in integrated production, inventory and distribution systems (IPIDS) is addressed.
Abstract: This paper deals with the problem of how to determine, with high reliability, economic levels for the base stock and lead times for production and transportation in integrated production, inventory and distribution systems (IPIDS). This system model has a ‘pull type’ ordering system and is of the three stage tandem type, consisting of manufacturer, wholesaler and retailer. A method is described for fixing ‘base stock’ levels and lead times, when product production and transportation stop, which prevents out of stock and minimizes dead stock at each stock point in the case where product models are changing in the market.
107 citations
TL;DR: Many previously known results concerning integrity are unified and several are extended and the set of all proper controllers ensuring integrity can be characterized with the U-matrix.
100 citations
TL;DR: It is shown that the closed-loop system formed by the optimal state feedback control has some desirable sensitivity and robustness properties and that the generalized cost functional contains a special class of cost functionals for which the optimal control can be realized by solving only a finite-dimensional Riccati equation.
92 citations
TL;DR: A kaolinite-polymer intercalation complex was formed by the polymerization of acrylonitrile between the Kaolinite layers by displacing intercalated ammonium acetate.
Abstract: A kaolinite-polymer intercalation complex was apparently formed for the first time by the polymerization of acrylonitrile between the kaolinite layers. A kaolinite-ammonium acetate intercalation complex was dispersed in acrylonitrile monomer. The monomer was apparently incorporated between the layers by displacing intercalated ammonium acetate. After the removal of excess monomer, the intercalation complex was heated to cause polymerization. The resulting kaolinite-polyacrylonitrile (PAN) intercalate showed a basal spacing of ∼ 13–14 A. On heating the complex at 220°C for 1 hr in air, the spacing decreased slightly. The hydrogen bond between the hydroxyls of kaolinite and probably the C≡N group of PAN was not affected after heating at 220°C. Even after heating at 400°C, the layers expanded. Because the starting kaolinite-ammonium acetate intercalation complex decomposed at a much lower temperature, these observations strongly suggest the presence of PAN between the layers.
91 citations
07 Dec 1988
TL;DR: In this article, an index for predicting voltage instability, based on the relationship between voltage instability and multiple-load flow solutions, is presented. But the authors do not consider the effect of voltage instability on the performance of the system.
Abstract: The authors deal with an index for predicting voltage instability, based on the relationship between voltage instability and multiple-load flow solutions. After comparison of several indices for two scenarios, the effectiveness of the VIPI (voltage instability proximity index) is shown. This index is computed from multiple-load-flow solutions and can be used for monitoring the system state. >
84 citations
TL;DR: In this paper, the tetraalkylammonium polysilicate intercalation compounds with chlorotrimethylsilane ((CH3)3SiCl) as the silylating agent were used for organic derivatization of layered polysilicates.
80 citations
TL;DR: The coincident loss of peptide immunoreactivity and motoneurones from the large motor nuclei and sparing of Onuf's nucleus and its peptide-containing constituents in the diseased state suggests that peptides contribute to maintenance of neural integrity.
TL;DR: Evidence was obtained that four ionizable residues in the alpha and beta subunits of thermophilic ATP synthase (TF0F1), corresponding to Lys-21 and Asp-119 in the MgATP binding segments of adenylate kinase, are essential for the normal catalytic activity.
TL;DR: Complementation analysis of the polarity effects exerted by the transposon-insertion mutants defined 13 different flagellar operons; 3 in region I, 4 in region II, and 6 in region III in Escherichia coli.
Abstract: In Salmonella typhimurium, more than 40 genes have been shown to be involved in flagellar formation and function and almost all of them have been assigned to three regions of the chromosome, termed region I, region II, and region III. In the present study, a large number of transposon-insertion mutants in these flagellar genes were isolated using Tn10 and Mud1. The flaV gene was found to be a strong hot spot for Tn10 insertion. Complementation analysis of the polarity effects exerted by the transposon-insertion mutants defined 13 different flagellar operons; 3 in region I, 4 in region II, and 6 in region III. These results are compared with the reported arrangement of the corresponding genes in Escherichia coli.
TL;DR: In this article, an atomic mass formula consisting of a gross part, an average even-odd part, and an empirical shell part is presented, where the gross part is, apart from a small atomic term, taken to be the sum of nucleon rest masses, Coulomb energies, and a polynomial in A 1 3 and |N − Z| A.
TL;DR: Chua, Komouro, and Matsumoto as mentioned in this paper proved that the double scroll circuit is chaotic in the sense of Shilnikov, and provided verifiable error bounds to the quantities involved in the inequalities with an assistance of a computer.
Abstract: The authors prove three key inequalities stated in the paper by L.O. Chua, M. Komouro, and T. Matsumoto (see ibid., vol. CAS-33, p. 1072-1118, 1986) by giving verifiable error bounds to the quantities involved in the inequalities with an assistance of a computer. This provides another rigorous proof that the so-called double scroll circuit is chaotic in the sense of Shilnikov. Since a computer is used, everything must be transparent; there should be no black box. To provide a rigorous computer-base free from roundoff errors, it is shown that all the computations are reduced to four logic operations: AND, OR, NOT, and XOR. Based on this, the computer performs internal analysis, which is a method of computing intervals containing the true values. This is important for two reasons: first, the double scroll circuit then becomes, the first real, physical system in which chaos is (i) observed in the laboratory, (ii) confirmed by computer simulation, and (iii) proven mathematically. Second, the author's approach can easily be modified to apply to other problems, providing a powerful tool for a large class of problems. >
TL;DR: The ‘state’-diagram showing the concentration range of ADP and Pi in which contraction, oscillation or relaxation of myofibrils occurs in the presence of ATP and the absence of Ca2+ suggested that the oscillation is a third state of skeletal muscle located in between the contracting and relaxing states.
Abstract: We found that the lengths of all sarcomeres spontaneously oscillated in an isolated skeletal myofibril, when both ends were fixed, submillimolar to millimolar concentrations of ATP, ADP and inorganic phosphate (Pi) were present, and Ca2+ was removed. Narrowing and widening of an H-zone and an I-band were observed corresponding to the shortening and lengthening of a sarcomere, suggesting that thick and thin filaments slide past each other. The oscillation of each sarcomere was asymmetrical, consisting of a rapid lengthening phase and a slow shortening phase. The period of oscillation was about 3 s; the peak-to-peak amplitude of oscillation reached as much as 30% of the average sarcomere length. The propagation of the sarcomere oscillation along the long axis of the myofibril was observed occasionally in single myofibrils and frequently in bundles of myofibrils. The ‘state’-diagram showing the concentration range of ADP and Pi in which contraction, oscillation or relaxation of myofibrils occurs in the presence of ATP and the absence of Ca2+ suggested that the oscillation is a third state of skeletal muscle located in between the contracting and relaxing states.
TL;DR: Six distinct cell types have been identified in the pars distalis of Japanese long-fingered bat by the unlabeled immunoperoxidase technique and by the ABC method, and no evidence of involution was observed in Pars distalis cells except for PRL cells in males or females during hibernation.
Abstract: Immunocytochemical studies were performed to describe the characteristics of cell types and their distribution in the pars distalis of Japanese long-fingered bat, Miniopterus schreibersii fuliginosus, collected at various stages of the reproductive cycle. Six distinct cell types have been identified in the pars distalis by the unlabeled immunoperoxidase technique and by the ABC method. Growth hormone (GH) and prolactin (PRL) cells were immunostained with antisera against chicken GH and ovine PRL. The GH-immunoreactive cells were round or oval orangeophilic cells distributed throughout the pars distalis with prominent aggregation in the posterolateral region. The PRL cells were pleomorphic carminophilic cells that occurred in small groups within the central and dorsocaudal regions of the pars distalis. They were sparsely distributed in the central region of the pars distalis in the hibernating bats, but increased significantly in the pregnant and lactating bats. The adrenocorticotropic (ACTH) cells were large round or polygonal amphophilic cells in the rostroventral and ventrolateral regions of the pars distalis. The thyrotropic (TSH) cells were small rounded or polygonal and distributed mainly in the ventrolateral region of the pars distalis. Luteinizing hormone (LH) and follicle-stimulating hormone (FSH) cells were identified immunocytochemically with antisera against the specific beta subunits of ovine LH and rat FSH. There were two populations of LH and FSH cells, one aggregated in the zona tuberalis and the other scattered singly throughout the rest of the pars distalis. The aggregated cells were immunoreactive with both antisera directed to LH and FSH, while scattered cells were reactive solely with antiserum to either LHβ or FSH and exhibited seasonal variations. In females, the proportional volume of the pars distalis occupied by LH cells was significantly reduced during pregnancy and lactation. No evidence of involution was observed in pars distalis cells except for PRL cells in males or females during hibernation.
TL;DR: In this article, the activity of montmorillonite pillared by alumina in the conversion of 1,2,4-trimethylbenzene was investigated in relation to its acidic property.
TL;DR: In this article, two design methods based on an LQ-problem for pole assignments in a truncated sector region of the left-half complex plane, which is given as a common area of a half plane Re λ≧-l ǫ > 0 and an open sector tan−1|Im λA/Re λǫ½ are proposed.
Abstract: A linear optimal quadratic regulator problem (an LQ-problem) is applied to assign all poles of the multivariable continuous-time system in a suitable region of the left-half complex plane. In particular, two design methods based on an LQ-problem for pole assignments in a truncated sector region of the left-half complex plane, which is given as a common area of a half plane Re λ≧-l > 0 and an open sector tan−1|Im λA/Re λ≦½ are proposed. Each design method is given for the cases where 0 ≧ ½π and 0 ≦ ½π respectively. As these two design methods are derived from two basically different ideas, they will prove more useful if each method can be applied according to the demands of the system's dynamical characteristics.
TL;DR: The enzyme was concluded to be membrane-associated and was activated maximally at low Ca2+ concentration (10(-7) M), when phosphatidylinositol 4,5-bisphosphate was used as a substrate, while the activity obtained with phosphatIDyl inositol increased with the Ca2- concentration up to 10(-4) M.
Abstract: Phospholipase C activities against phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol have been examined using head homogenate of Drosophila visual mutants. In many mutants the enzyme activities were found to be reduced. The activities against both phosphatidylinositol 4,5-bisphosphate and phosphatidylinositol were always affected in parallel among the mutants, while the activities of other enzymes related to phosphatidylinositol metabolism, such as diacylglycerol kinase, were not. The enzyme was concluded to be membrane-associated and was activated maximally at low Ca2+ concentration (10(-7) M), when phosphatidylinositol 4,5-bisphosphate was used as a substrate, while the activity obtained with phosphatidylinositol increased with the Ca2+ concentration up to 10(-4) M. The effects of pH on these two enzyme activities differed to some extent.
TL;DR: In this paper, it was found that the Si(100)2 × n structures are induced by Ni contamination in the range between 0.35 and 0.95% of the Auger electron peak ratio, Ni LMM/Si LVV.
TL;DR: In this article, the effects of temperature and concentration polarization on the water vapour permeability of polytetrafluoroethylene (PTFE) membranes were investigated.
TL;DR: A series of monoclonal antibodies that bound to phosphatidylinositol 4,5-bisphosphate [PI(4,5)P2] which is confidently believed to play an important role in cellular signal transduction was established.
TL;DR: In this paper, both amorphous and crystallized Ni-Mo-P alloy films were prepared by simply controlling the Na/sub 2/MoO/sub 4/ concentration in the baths.
Abstract: The film properties and the heat change properties of new electroless plated Ni-Mo-P alloy films, which were deposited from a newly developed simpler bath with direct addition of Na/sub 2/MoO/sub 4/, were investigated as a basis for developing new functional thin film. Both amorphous and crystallized Ni-Mo-P alloy films were prepared by simply controlling the Na/sub 2/-MoO/sub 4/ concentration in the baths. The maximum molybdenum content of 14.9 atom percent (22.3 weight percent) was attained at a Na/sub 2/MoO/sub 4/ concentration of 0.020 mol dm /sup -3/, and the films having high resistivity and high thermal stability were obtained. The formation of solid solution between Ni matrix and codeposited Mo was indicated on the basis of comparison with bulk Ni-Mo alloy. The amorphous Ni-Mo-P alloy film had much better thermal stability than did the amorphous Ni-P alloy film. In the case of crystallized Ni-Mo-P alloy film, the small grain size of electroless Ni-Mo-P alloy film was maintained even after heat-treatment up to 400/sup 0/C. The crystallization process of the amorphous and crystallized Ni-Mo-P alloy films by heat-treatment was quite different from that of an ordinary electroless Ni-P alloy film. Three structural changes resulting from heat-treatment were observed in electroless Ni-Mo-Pmore » alloy films, namely, The formation of Ni/sub 3/P, the crystallization of Ni-Mo alloy, and the transformation of Ni-Mo alloy. A schematic model of Ni-Mo-P alloy films composed of two phases or zones, namely, the Ni-Mo and Ni-Mo-P, was proposed to explain the heat change properties of Ni-Mo-P alloy films.« less
TL;DR: In this paper, a hydrotalcite (layered magnesium-aluminum double hydroxide)-polyacrylonitrile (PAN) intercalation compound has been prepared for the first time.
TL;DR: Diploid strains were obtained following protoplast fusion between two citric acid producers of Aspergillus niger, one for the solid culture and the other for the shaking culture; the best diploid strain produced 1.2 times as muchcitric acid as the parental strain in solid culture.
Abstract: Diploid strains were obtained following protoplast fusion between two citric acid producers of Aspergillus niger, one for the solid culture and the other for the shaking culture. In the shaking culture, all the diploid strains exhibited lower productivities than one parental strain. However, in the solid culture, some diploid strains exhibited higher productivities than either parental strain; the best diploid strain produced 1.2 times as much citric acid as the parental strain in solid culture.
TL;DR: In this article, the results of particle precipitation, energy spectra, pitch angle distributions and the geographical distribution of the particle precipitation zone were presented as intensity time profiles of the precipitation, and it was shown that the zone is centered near L = 1.71, the width of the zone was ΔL = ± 0.16, and the maximum energy of the precipitating particle is less than 1 MeV.
TL;DR: In this article, a mixed-valent tetranuclear platinum complex was used as a homogeneous hydrogen-producing catalyst in a photochemical model system containing EDTA as an electron donor, Ru(bpy)3 2+ as a sensitizer and methylviologen (MV2+) as a electron relay.
Abstract: Mixed-valent tetranuclear platinum complex, [Pt4(NH3)8(C4H6NO)4] n+ (n = 4, 5, 6, 8; C4H6NO = deprotonated α-pyrrolidone), is used as a homogeneous hydrogen-producing catalyst in a photochemical model system containing EDTA as an electron donor, Ru(bpy)3 2+ as a sensitizer and methylviologen (MV2+) as an electron relay.