Alteration of the equal settling ratio of fine particles by vertically-oscillating water     

Tatsuya Oki  Mikio Kobayashi  Shuji Owada  Daiki Matsuura 《International Journal of Mineral Processing》2007

An equal settling ratio is an important factor in estimating particle separation accuracy. However, this factor is often calculated using the settling velocity in stationary water, there are no examples of calculation of the equal settling ratio in an actual separator. This is difficult because particle movement in a separator is very complicated, and even simple periodic motions, such as the oscillation field used with many separators, are ignored in many cases. The authors have previously reported on the relation between the equal settling ratio and the oscillation frequency by analysis of particle movement in vertically oscillating water, using spherical particles of glass (average size 435 μm) and zirconia (202 μm) which have the same settling velocity in stationary water. In this study, the influence of particle diameter on the change in the settling velocity in oscillating water was experimentally investigated for three pairs of glass and zirconia particles having different sizes under 0.5 mm, which have the same settling velocity in stationary water. The settling velocities of different-sized particles decreased at different rates in oscillating water, indicating that the equal settling ratio is reduced by water oscillation. We conclude that water oscillation improves the accuracy of size separation for glass particles over 300 μm and zirconia particles over 150 μm when glass and zirconia particles are separated from each other with the difference of these settling velocities.  相似文献   

An Extension of the Mellor–Yamada Model to the Terra Incognita Zone for Dry Convective Mixed Layers in the Free Convection Regime     

Junshi Ito  Hiroshi Niino  Mikio Nakanishi  Chin-Hoh Moeng 《Boundary-Layer Meteorology》2015,157(1):23-43

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The XUV Doppler Telescope (XDT)     

Sakao  T.  Tsuneta  S.  Hara  H.  Shimizu  T.  Kano  R.  Kumagai  K.  Yoshida  T.  Nagata  S.  Kobayashi  K. 《Solar physics》1999,187(2):303-333

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日本东北9.0级地震的同震与震后滑动   总被引：3，自引：0，他引：3  

Hisashi Suito  Mikio Tobita  张慧 《华南地震》2011,31(3):11-18

大部分强震都发生在海沟,那里是海洋板块向大陆板块俯冲的地方.大量矩震级MW9.0以上的地震发生在若干区域,包括智利,阿拉斯加,堪察加半岛和苏门答腊岛等.位于太平洋板块俯冲鄂霍茨克板块的日本海沟,历史记载上没有发生过MW9.0地震,除了至今震级还有争议的公元869年Jogan大地震[1](可能超过MW9.0).然而,根据...  相似文献   

Spectra of surface atmospheric quantities at ocean weathership P     

David Fissel  Stephen Pond  Mikio Miyake 《大气与海洋》2013,51(2):77-97

Ten years of surface weather data from Ocean Weather Station P were subjected to spectral analysis. The wind speed and air pressure auto‐spectra reveal large variations at synoptic periods while the auto‐spectra of the sea temperature, air temperature and absolute humidity are dominated by the annual variations. The rotary auto‐spectrum of the wind features a broad peak of activity centered at a period of 3 days. In addition, the spectra of quantities representative of the wind stress and sensible and latent heat fluxes are discussed. Spectra of these surface weather quantities computed for each season show that the activity changes both with respect to the size and frequency of the variations during the course of a year. The cross‐spectra between selected pairs of quantities were also computed and are discussed.  相似文献   

Pulsation at the tip of the first giant branch?     

Yoshifusa Ita  Toshihiko Tanabé  Noriyuki Matsunaga  Yasushi Nakajima  Chie Nagashima  Takahiro Nagayama  Daisuke Kato  Mikio Kurita  Tetsuya Nagata  Shuji Sato  Motohide Tamura  Hidehiko Nakaya  Yoshikazu Nakada 《Monthly notices of the Royal Astronomical Society》2002,337(3):L31-L34

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The X-Ray Telescope (XRT) for the Hinode Mission     

L. Golub  E. DeLuca  G. Austin  J. Bookbinder  D. Caldwell  P. Cheimets  J. Cirtain  M. Cosmo  P. Reid  A. Sette  M. Weber  T. Sakao  R. Kano  K. Shibasaki  H. Hara  S. Tsuneta  K. Kumagai  T. Tamura  M. Shimojo  J. McCracken  J. Carpenter  H. Haight  R. Siler  E. Wright  J. Tucker  H. Rutledge  M. Barbera  G. Peres  S. Varisco 《Solar physics》2007,243(1):63-86

The X-ray Telescope (XRT) of the Hinode mission provides an unprecedented combination of spatial and temporal resolution in solar coronal studies. The high sensitivity and broad dynamic range of XRT, coupled with the spacecraft’s onboard memory capacity and the planned downlink capability will permit a broad range of coronal studies over an extended period of time, for targets ranging from quiet Sun to X-flares. This paper discusses in detail the design, calibration, and measured performance of the XRT instrument up to the focal plane. The CCD camera and data handling are discussed separately in a companion paper.  相似文献   

Variable stars in the Magellanic Clouds: results from OGLE and SIRIUS     

Yoshifusa Ita  Toshihiko Tanabé  Noriyuki Matsunaga  Yasushi Nakajima  Chie Nagashima  Takahiro Nagayama  Daisuke Kato  Mikio Kurita  Tetsuya Nagata  Shuji Sato  Motohide Tamura  Hidehiko Nakaya  Yoshikazu Nakada 《Monthly notices of the Royal Astronomical Society》2004,347(3):720-728

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The structure of cometary atmospheres     

Mikio Shimizu 《Astrophysics and Space Science》1976,40(2):243-251

The distributions of various kinds of molecular ions in the atmospheres of new and old comets made up from dirty ice of the second kind (H₂O ice and hydrate clathrates of CO and N₂) have been computed at various heliocentric distances, by taking into account photoionization, ionmolecular reactions, electron-ion recombinations, and some transport effects. The results have been compared with observations and other computations. It is argued that dirty ice of the second kind model will impose a restriction on the theory of the origin of the solar system.  相似文献   

The Hinode X-Ray Telescope (XRT): Camera Design, Performance and Operations     

R. Kano  T. Sakao  H. Hara  S. Tsuneta  K. Matsuzaki  K. Kumagai  M. Shimojo  K. Minesugi  K. Shibasaki  E. E. DeLuca  L. Golub  J. Bookbinder  D. Caldwell  P. Cheimets  J. Cirtain  E. Dennis  T. Kent  M. Weber 《Solar physics》2008,249(2):263-279

The X-ray Telescope (XRT) aboard the Hinode satellite is a grazing incidence X-ray imager equipped with a 2048×2048 CCD. The XRT has 1 arcsec pixels with a wide field of view of 34×34 arcmin. It is sensitive to plasmas with a wide temperature range from < 1 to 30 MK, allowing us to obtain TRACE-like low-temperature images as well as Yohkoh/SXT-like high-temperature images. The spacecraft Mission Data Processor (MDP) controls the XRT through sequence tables with versatile autonomous functions such as exposure control, region-of-interest tracking, flare detection, and flare location identification. Data are compressed either with DPCM or JPEG, depending on the purpose. This results in higher cadence and/or wider field of view for a given telemetry bandwidth. With a focus adjust mechanism, a higher resolution of Gaussian focus may be available on-axis. This paper follows the first instrument paper for the XRT (Golub et al., Solar Phys. 243, 63, 2007) and discusses the design and measured performance of the X-ray CCD camera for the XRT and its control system with the MDP.  相似文献