Determination of Clay Minerals by the Ignition Loss MethodUsing a Muffle Furnace

A technique for determining the layer structure and content of clay minerals was developed based on the relationship between temperature, and moisture characteristics of clay minerals. Moisture content in standard specimens, prepared by mixing montmorillonite, kaolinite and quartz in various proportions, was determined by measuring weight loss after heating. Based on the results from differential thermal analysis tests, the ignition loss method was found to be widely applicable to clays with montmorillonite and kaolinite as the main components. Dehydration of constituent water occurred at 530℃ and 800℃ in two- and three-layered clay minerals, respectively

System Design of an Autonomous Underwater Robot “DaryaBird”

Various kinds of robots have been developed parallel with the progress of computers and information processing technology, and the operations in the extreme environments, such as disaster areas, space and ocean, are getting one of the practical solutions for those hazardous missions. The underwater robots are one of the extreme environment robots and expected as one of solutions for underwater activities i.e., maintenance of underwater structures, observations, scientific research, where research area is getting wide and deep and also underwater structures are getting large-scale and deep-depth. Their efficiencies have been investigated during recent decades and are proven by ocean experiments. However, the robotic system including the support vessels is still big scale, and not so easy to handle by a few researchers. In this paper, we describe the design of an underwater robot “DaryaBird” developed aiming at handy, small underwater robots which can be operated by a few researchers. In addition, experimental results and mission strategies for AUVC 2010 are reported.AUVSI & ONR\u27s 13th AUVSI 2010 : Association for Unmanned Vehicle Systems International (AUVSI) North America 2010, Aug 24-27, 2010, Denver, CO., US

Speed Control of D.C. Moter by Ultra Low Frequency signal

application/pdfBulletin of University of Osaka Prefecture. Series A, Engineering and natural sciences. 1958, 6, p.85-93departmental bulletin pape

Uniform approximation to finite Hilbert transform of oscillatory functions and its algorithm

For the finite Hilbert transform of oscillatory functions Q(f;c,ω)＝f^1_-1 f(x) e^iωx / (x－c) dt with a smooth function f and real ω ≠ 0, for c ∈ (-1,1) in the sense of Cauchy principal value or for c=±1 of Hadamard finite-part, we present an approximation method of Clenshaw–Curtis type and its algorithm. Interpolating f by a polynomial pn of degree n and expanding in terms of the Chebyshev polynomials with O(n log n) operations by the FFT, we obtain an approximation Q(pn;c,ω) ≅ Q(f;c,ω). We write Q(pn;c,ω) as a sum of the sine and cosine integrals and an oscillatory integral of a polynomial of degree n－1. We efficiently evaluate the oscillatory integral with a combination of authors’ previous method and Keller’s method. For f(z) analytic on the interval ［-1,1］in the complex plane z, the error of Q(pn;c,ω) is bounded uniformly with respect to c and ω. Numerical examples illustrate the performance of our method.journal articl

Proliferation Kinetics of Tumor and Host Cells after Chemotherapeutic Treatment

1975-03In order to find the most effective schedule of Mitomycine C (MMC) treatment against tumor bearing individuals, an investigation was made to compare the growth kinetics of solid and ascites tumor cells with that of intestinal mucosa cells before and after MMC treatment. In the duodenal crypt epithelium of the mouse, desoxyribonucleic acid (DNA) synthesis as measured by thymidine uptake was first depressed within 0.5 hours after a single injection of 40 μg/kg or 400 μg/kg of MMC, significantly increased over the control level at 24 hours and then gradually returned to the range of the control. Similar results were obtained in mitotic activity. In contrast, DNA synthesis in Ehrlich ascites tumor was depressed within 0.5 hours and not recovered yet at 24 hours after the same dosage of MMC. It was also noted that the cell repair in Yoshida solid tumor, after the damage due to MMC, was slow as compared to that in the intestinal mucosa of the rat. These data suggest that in the duodenal crypt epithelium some compensatory homeostatic mechanism of tissue level, which may alter their proliferative state, may be operative after the administration of the chemotherapeutic agents. It is, therefore, recommended that antitumor agents should be given under consideration of the different kinetics of regulatory cell repair of host and tumor tissues.departmental bulletin pape

On the global convergence of Schröder’s iteration formula for real zeros of entire functions

Schröder’s formula of the second kind of order m of convergence (S2-m formula) is a generalization of Newton’s (m = 2) and Halley’s (m = 3) iterative formulae for finding zeros of functions. The authors showed that the S2-m formula of every odd order m ≥ 3 converges globally and monotonically to real zeros of polynomials on the real line. For Halley’s formula, such the convergence property for real zeros of entire functions had been shown by Davies and Dawson. In this paper, we extend both results by showing that the S2- m formula of every odd order m ≥ 5 has the same convergence property for real zeros of entire functions. By numerical examples we illustrate the monotonic convergence of the formula of odd order m = 3,5 and 7 and the non-monotonic convergence of even order m = 2,4 and 6. Further, we compare several formulae of both first and second kinds in performance.journal articl

Extensions of Clenshaw-Curtis-type rules to integrals over a semi-infinite interval

The Clenshaw-Curtis (C-C) rule is a quadrature formula for integrals on an interval [− 1,1] and efficient for smooth integrands f(x). Analogous rules exist: Fejér’s first and second kind, Basu and corrected C-C rules. We attempt to extend these five rules to integrals over a semi-infinite interval [0,∞) to develop corresponding formulae. Developing contour integration representations of the errors of the formulae, we prove that for f(z) analytic in a region containing [0,∞) in the complex plane z, the errors are of O(h^je^−c/h) (j=1,2,…,5), respectively, with a constant c > 0 as step size h → + 0. The extension of Fejér’s second rule (the case j = 1) agrees with a formula based on the Sinc interpolation. Numerical experiments show that new formulae inherit nice features of the C-C rule and its four analogs. For large h, the convergence rates are twice as fast as the asymptotic rates for small h. The kink phenomenon that is explained in the C-C rule and Fejér’s first rule appears in the convergence curves.journal articl