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Waveform inversion of shallow seismic refraction data using hybrid heuristic search method
Takekoshi, Mika,Yamanaka, Hiroaki Korean Society of Earth and Exploration Geophysici 2009 지구물리와 물리탐사 Vol.12 No.1
We propose a waveform inversion method for SH-wave data obtained in a shallow seismic refraction survey, to determine a 2D inhomogeneous S-wave profile of shallow soils. In this method, a 2.5D equation is used to simulate SH-wave propagation in 2D media. The equation is solved with the staggered grid finite-difference approximation to the 4th-order in space and 2nd-order in time, to compute a synthetic wave. The misfit, defined using differences between calculated and observed waveforms, is minimised with a hybrid heuristic search method. We parameterise a 2D subsurface structural model with blocks with different depth boundaries, and S-wave velocities in each block. Numerical experiments were conducted using synthetic SH-wave data with white noise for a model having a blind layer and irregular interfaces. We could reconstruct a structure including a blind layer with reasonable computation time from surface seismic refraction data.
Experimental study on electric motor as a sound device
Takaaki Takekoshi,Tomoyuki Ohkubo,Yousuke Kurihara,Kazuyuki Kobayashi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Electric motors are widely used for actuating tasks in systems such as home appliance vacuum cleaners. The main problem with a vacuum cleaner is the large noise from the motor at high-speed rotation. Although research is underway to develop new technology for suppressing motor noise, it is a difficult goal to achieve since motor noise is generated by numerous factors. In this paper, we propose a different solution to the problem. Instead of suppressing the motor noise, we attempt to control the noise spectrum according to the human sound perception. To achieve this, a motor control driver is required for controlling the motor rotational speed and motor noise spectrum independently. To confirm the validity of our proposed concept, we developed a basic prototype of the motor control driver for experimental testing.
Masuo Nakano,Shiro Nakano,Hideo Takekoshi 한국식품영양과학회 2007 Journal of medicinal food Vol.10 No.1
In addition to meeting nutritional requirements, breast milk plays important roles in biodefense for nursing in-fants. Dioxins have been detected at high concentrations in breast milk, raising concerns about disorders in nursing infantscaused by breast milk containing dioxins in Japan. We analyzed dioxin levels in breast milk and maternal blood samples from35 pregnant women in Japan. We also measured immunoglobulin (Ig) A concentrations in breast milk and investigated cor-relations with dioxin concentrations. In addition, 18 of the 35 women took Chlorella pyrenoidosa(Chlorella) supplementsduring pregnancy, and the effects on dioxin and IgA concentrations in breast milk were investigated. Toxic equivalents weresignificantly lower in the breast milk of women taking Chlorellatablets than in the Control group (P. .003). These resultssuggest that Chlorellasupplementation by the mother may reduce transfer of dioxins to the child through breast milk. No sig-nificant correlation was identified between dioxin and IgA concentrations in breast milk in the Control group. It is unlikelythat normal levels of dioxin exposure via food have a remarkable influence on IgA in breast milk. IgA concentrations in breastmilk in the Chlorellagroup were significantly higher than in the Control group (P. .03). Increasing IgA levels in breast milkis considered to be effective for reducing the risk of infection in nursing infants. The present results suggest that Chlorellasupplementation not only reduces dioxin levels in breast milk, but may also have beneficial effects on nursing infants by in-creasing IgA levels in breast milk.
Chronic Heavy Metal Exposure and Gallbladder Cancer Risk in India, a Comparative Study with Japan
Chhabra, Deepak,Oda, Koji,Jagannath, Palepu,Utsunomiya, Hirotoshi,Takekoshi, Susumu,Nimura, Yuji Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.1
Background: High incidence of gallbladder cancer (GBC) is reported from North India, with elevated concentrations of heavy metals in water and soil. This Indo-Japan collaborative study compared presence of heavy metals in gallbladder tissues. Methods: Heavy metal concentrations were estimated in Indian GBC and cholecystitis tissues and compared with Japanese GBC and cholecystitis tissues. Spectrophotometry was done for 13 Indian gallbladder tissues (8 GBC, 5 cholecystitis) and 9 Japanese (5 GBC, 4 cholecystitis). Transmission electron microscopy (TEM) thin foil element analysis was done in 10 Indian samples (6 GBC, 4 cholecystitis). Results: Chromium, lead, arsenic and zinc were significantly high in Indian GBC compared with Japanese GBC. Chromium, lead and arsenic were significantly high in the Indian cholecystitis tissues compared to the Japanese. TEM of Indian tissues demonstrated electron dense deposits in GBC. Conclusion: Heavy metals-chromium, lead, arsenic and zinc are potential carcinogens in Indian GBC from endemic areas. This preliminary study links presence of heavy metals in gallbladder cancer tissues in endemic areas.
Minamidani, Tetsuhiro,Tanaka, Takanori,Mizuno, Yoji,Mizuno, Norikazu,Kawamura, Akiko,Onishi, Toshikazu,Hasegawa, Tetsuo,Tatematsu, Ken'ichi,Takekoshi, Tatsuya,Sorai, Kazuo,Moribe, Nayuta,Torii, Kazufu American Institute of Physics 2011 The Astronomical journal Vol.141 No.3
<P>In order to precisely determine the temperature and density of molecular gas in the Large Magellanic Cloud, we made observations of the optically thin <SUP>13</SUP>CO(J = 3-2) transition using the ASTE 10 m telescope toward nine peaks where <SUP>12</SUP>CO(J = 3-2) clumps were previously detected with the same telescope. The molecular clumps include those in giant molecular cloud (GMC) Types I (with no signs of massive star formation), II (with H <SPAN CLASS='sml'>II</SPAN> regions only), and III (with H <SPAN CLASS='sml'>II</SPAN> regions and young star clusters). We detected <SUP>13</SUP>CO(J = 3-2) emission toward all the peaks and found that their intensities are 3-12 times lower than those of <SUP>12</SUP>CO(J = 3-2). We determined the intensity ratios of <SUP>12</SUP>CO(J = 3-2) to <SUP>13</SUP>CO(J = 3-2), R<SUP>12/13</SUP><SUB>3-2</SUB>, and <SUP>13</SUP>CO(J = 3-2) to <SUP>13</SUP>CO(J = 1-0), R<SUP>13</SUP><SUB>3-2/1-0</SUB>, at 45'' resolution. These ratios were used in radiative transfer calculations in order to estimate the temperature and density of the clumps. The clumps have a kinetic temperature range of T<SUB>kin</SUB> = 15-200 K and a molecular hydrogen gas density range of n(H<SUB>2</SUB>) = 8 × 10<SUP>2</SUP>-7 × 10<SUP>3</SUP> cm<SUP>–3</SUP>. We confirmed that the higher density clumps have higher kinetic temperature and that the lower density clumps have lower kinetic temperature to better accuracy than in previous work. The kinetic temperature and density increase generally from a Type I GMC to a Type III GMC. We interpret that this difference reflects an evolutionary trend of star formation in molecular clumps. The R<SUP>13</SUP><SUB>3-2/1-0</SUB> and kinetic temperature of the clumps are well correlated with the Hα flux, suggesting that the heating of molecular gas with density n(H<SUB>2</SUB>) = 10<SUP>3</SUP>-10<SUP>4</SUP> cm<SUP>–3</SUP> can be explained by stellar far-ultravoilet photons.</P>