On the dynamical consequence of the horizontal dimension of a typhoon     

Dr. Hiroshi Matano  Prof. Mitsuru Sekioka 《Meteorology and Atmospheric Physics》1974,23(1):29-54

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Experimental petrology of sample 77135     

W.C. Storey  D.J. Humphries  M.J. O&#x;Hara 《Earth and Planetary Science Letters》1974,23(3):435-438

The matrix of 77135 would not be a liquid at less than 1280°C, 1 atm pressure. The petrography and lack of evidence of crystallization in the 1280-1150°C interval suggest that the matrix is either a devitrified, shock-melted and supercooled glass, or a devitrified, depressurised liquid whose liquidus temperature had been depressed by the presence of a small amount of water at pressures attainable in the upper part of the lunar crust. Devitrification fronts would have advanced faster than 1 mm min^?1 in 77135 glass at 1050°C under lunar surface conditions.  相似文献   

Ion microprobe Sr isotope analysis of carbonates with about 5 μm spatial resolution: An example from an ayu otolith     

Yuji Sano  Kotaro Shirai  Naoto Takahata  Hiroshi Amakawa  Tsuguo Otake 《Applied Geochemistry》2008,23(8):2406-2413

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Far-infrared dust properties in the Galaxy and the Magellanic Clouds     

Hiroyuki Hirashita  Yasunori Hibi  Hiroshi Shibai 《Monthly notices of the Royal Astronomical Society》2007,379(3):974-984

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Laboratory Experiment of Plasma Flow Around Magnetic Sail     

Ikkoh Funaki  Hidenori Kojima  Hiroshi Yamakawa  Yoshinori Nakayama  Yukio Shimizu 《Astrophysics and Space Science》2007,307(1-3):63-68

To propel a spacecraft in the direction leaving the Sun, a magnetic sail (MagSail) blocks the hypersonic solar wind plasma flow by an artificial magnetic field. In order to simulate the interaction between the solar wind and the artificially deployed magnetic field produced around a magnetic sail spacecraft, a laboratory simulator was designed and constructed inside a space chamber. As a solar wind simulator, a high-power magnetoplasmadynamic arcjet is operated in a quasisteady mode of 0.8 ms duration. It can generate a simulated solar wind that is a high-speed (above 20 km/s), high-density (10¹⁸ m⁻³) hydrogen plasma plume of ∼0.7 m in diameter. A small coil (2 cm in diameter), which is to simulate a magnetic sail spacecraft and can obtain 1.9-T magnetic field strength at its center, was immersed inside the simulated solar wind. Using these devices, the formation of a magnetic cavity (∼8 cm in radius) was observed around the coil, which indicates successful simulation of the plasma flow of a MagSail in the laboratory.  相似文献   

Global SH-wave propagation in a 2D whole Moon model using the parallel hybrid PSM/FDM method     

Xianghua Jiang  Yanbin Wang  Yanfang Qin  Hiroshi Takenaka 《地震科学（英文版）》2015,28(3):163-174

We present numerical modeling of SH-wave propagation for the recently proposed whole Moon model and try to improve our understanding of lunar seismic wave propagation. We use a hybrid PSM/FDM method on staggered grids to solve the wave equations and implement the calculation on a parallel PC cluster to improve the computing efficiency. Features of global SH-wave propagation are firstly discussed for a 100-km shallow and 900-km deep moonquakes, respectively. Effects of frequency range and lateral variation of crust thickness are then investigated with various models. Our synthetic waveforms are finally compared with observed Apollo data to show the features of wave propagation that were produced by our model and those not reproduced by our models. Our numerical modeling show that the low-velocity upper crust plays significant role in the development of reverberating wave trains. Increasing frequency enhances the strength and duration of the reverberations. Surface multiples dominate wavefields for shallow event. Core–mantle reflections can be clearly identified for deep event at low frequency. The layered whole Moon model and the low-velocity upper crust produce the reverberating wave trains following each phases consistent with observation. However, more realistic Moon model should be considered in order to explain the strong and slow decay scattering between various phases shown on observation data.  相似文献   

Experimental evaluation of dynamic characteristics of seesaw energy dissipation system for vibration control of structures          下载免费PDF全文

Jae‐Do Kang  Hiroshi Tagawa 《地震工程与结构动力学》2014,43(12):1889-1895

Seesaw energy dissipation system (SEDS), a vibration control system used to provide enhanced seismic protection, has been proposed and investigated numerically. Because of its complicated arrangement, verification experiments are necessary to demonstrate the SEDS damping capacity. This paper presents the results of experimental investigation of the SEDS using fluid viscous dampers. Free vibration tests are conducted to demonstrate the SEDS damping capacity. Results of the free vibration test show that the SEDS has sufficient damping capacity for reduction of the seismic response of the frames. Parametric experimental investigations of the SEDS were conducted, the results of which demonstrate the effects of the system parameter on the damping capacity. Copyright © 2014 John Wiley & Sons, Ltd.  相似文献   

Timeline analysis and wavelet multiscale analysis of the AKARI All-Sky Survey at 90 μm     

Lingyu Wang  Michael Rowan-Robinson  Issei Yamamura  Hiroshi Shibai  Rich Savage  Seb Oliver  Matthew Thomson  Nurur Rahman  Dave Clements  Elysandra Figueredo  Tomotsugu Goto  Sunao Hasegawa  Woong-Seob Jeong  Shuji Matsuura  Thomas G. Müller  Takao Nakagawa  Chris P. Pearson  Stephen Serjeant  Mai Shirahata  Glenn J. White 《Monthly notices of the Royal Astronomical Society》2008,387(2):601-615

We present a careful analysis of the point-source detection limit of the AKARI All-Sky Survey in the WIDE-S 90-μm band near the North Ecliptic Pole (NEP). Timeline analysis is used to detect IRAS ( Infrared Astronomy Satellite ) sources and then a conversion factor is derived to transform the peak timeline signal to the interpolated 90-μm flux of a source. Combined with a robust noise measurement, the point-source flux detection limit at signal-to-noise ratio  (S/N) > 5  for a single detector row is  1.1 ± 0.1 Jy  which corresponds to a point-source detection limit of the survey of ∼0.4 Jy.
Wavelet transform offers a multiscale representation of the Time Series Data ( tsd ). We calculate the continuous wavelet transform of the tsd and then search for significant wavelet coefficients considered as potential source detections. To discriminate real sources from spurious or moving objects, only sources with confirmation are selected. In our multiscale analysis, IRAS sources selected above 4σ can be identified as the only real sources at the Point Source Scales. We also investigate the correlation between the non- IRAS sources detected in timeline analysis and cirrus emission using wavelet transform and contour plots of wavelet power spectrum. It is shown that the non- IRAS sources are most likely to be caused by excessive noise over a large range of spatial scales rather than real extended structures such as cirrus clouds.  相似文献   

Diffuse carbon dioxide emissions from hidden subsurface structures at Asama volcano,Japan     

Masaaki Morita  Toshiya Mori  Ryunosuke Kazahaya  Hiroshi Tsuji 《Bulletin of Volcanology》2016,78(3):17

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Seismic behavior of bridges with pier and foundation strengthening: PsD tests and analytical study     

Anawat Chotesuwan  Hiroshi Mutsuyoshi  Takeshi Maki 《地震工程与结构动力学》2012,41(2):279-294

By means of a simplified three degrees of freedom model, seismic behavior of reinforced concrete bridge piers and foundations were evaluated based on pseudo‐dynamic (PsD) tests for cases where pier strengthening and foundation strengthening are implemented. In addition, analysis based on PsD test results was conducted to investigate the influence of pier strengthening on seismic damage to the foundation. The PsD tests and the analysis show that the foundation suffers increased hysteretic response when pier strengthening is applied. The results also show that the foundation strengthening can prevent foundation damage. Copyright © 2011 John Wiley & Sons, Ltd.  相似文献