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101.
Blackman Donna K. Abe Natsue Carlson Richard L. Guerin Gilles Ildefonse Benoit Kumpf Amber 《Marine Geophysical Researches》2019,40(4):557-569
Marine Geophysical Research - The physical properties of rock within Oceanic Core Complexes (OCC) provide information about the history of magmatism, deformation and alteration associated with... 相似文献
102.
Marcel Carbillet Philippe Bendjoya Lyu Abe G��raldine Guerri Anthony Boccaletti Jean-Baptiste Daban Kjetil Dohlen Andr�� Ferrari Sylvie Robbe-Dubois Richard Douet Farrokh Vakili 《Experimental Astronomy》2011,30(1):39-58
SPHERE (which stands for Spectro-Polarimetric High-contrast Exoplanet REsearch) is a second-generation Very Large Telescope (VLT) instrument dedicated to high-contrast direct imaging of exoplanets which first-light is scheduled for 2011. Within this complex instrument one of the central components is the apodized Lyot coronagraph (ALC). The present paper reports on the most interesting aspects and results of the whole numerical study made during the design of the ALC for SPHERE/VLT. The method followed for this study is purely numerical, but with an end-to-end approach which is largely fed by a number of instrumental feedbacks. The results obtained and presented in this paper firstly permit to finalize the optical design before laboratory performance testing of the ALC being built for SPHERE/VLT (see paper II ??Laboratory tests and performances??), but will also hopefully help conceiving future other instruments alike, for example within the very promising extremely large telescope perspective. 相似文献
103.
Goh Onitsuka Yutaka Yoshikawa Tomoyuki Shikata Kei Yufu Kazuo Abe Takahisa Tokunaga Katsunori Kimoto Takeshi Matsuno 《Journal of Oceanography》2018,74(4):351-365
The temporal evolution of a thin phytoplankton layer was observed by field measurements using a research vessel and mooring instruments in the Yatsushiro Sea, a semi-enclosed narrow embayment in Japan, in early August 2013. The subsurface chlorophyll maximum developed into a thin layer within 2 days just below the pycnocline at around 10-m depth, where turbulent mixing (the dissipation rate of turbulent kinetic energy) was weak (low). The layer persisted for 1.5 to 2 days and declined after irradiance drastically decreased at the sea surface. At the peak period, the layer thickness, which is defined as the full-width at half-maximum of the peak in chlorophyll a concentration, ranged from 0.6 to 1.4 m, and the maximum concentration reached 42.3 mg m?3. The horizontal extent of the layer was approximately 10 km along the longitudinal axis of the bay. The phytoplankton population characterized by the layer was dominated by a chain-forming centric diatom, Chaetoceros spp. The formation mechanisms of the thin diatom layer were investigated using the observed data and a vertical one-dimensional model that includes physical and biological processes. The results suggest that the development of the thin layer was caused by in situ growth and aggregation due to nutrient-dependent sinking of the species under weak turbulence. The study highlights that continuous multidisciplinary observations and understanding species-specific physiological responses to environmental variations are necessary to elucidate drastically fluctuating phytoplankton dynamics in a coastal water. 相似文献
104.
Masanao Abe 《Meteoritics & planetary science》2017,52(8):1756-1757
105.
Tokuta Yokohata James D. Annan Matthew Collins Charles S. Jackson Hideo Shiogama Masahiro Watanabe Seita Emori Masakazu Yoshimori Manabu Abe Mark J. Webb Julia C. Hargreaves 《Climate Dynamics》2013,41(9-10):2745-2763
We investigate the performance of the newest generation multi-model ensemble (MME) from the Coupled Model Intercomparison Project (CMIP5). We compare the ensemble to the previous generation models (CMIP3) as well as several single model ensembles (SMEs), which are constructed by varying components of single models. These SMEs range from ensembles where parameter uncertainties are sampled (perturbed physics ensembles) through to an ensemble where a number of the physical schemes are switched (multi-physics ensemble). We focus on assessing reliability against present-day climatology with rank histograms, but also investigate the effective degrees of freedom (EDoF) of the fields of variables which makes the statistical test of reliability more rigorous, and consider the distances between the observation and ensemble members. We find that the features of the CMIP5 rank histograms, of general reliability on broad scales, are consistent with those of CMIP3, suggesting a similar level of performance for present-day climatology. The spread of MMEs tends towards being “over-dispersed” rather than “under-dispersed”. In general, the SMEs examined tend towards insufficient dispersion and the rank histogram analysis identifies them as being statistically distinguishable from many of the observations. The EDoFs of the MMEs are generally greater than those of SMEs, suggesting that structural changes lead to a characteristically richer range of model behaviours than is obtained with parametric/physical-scheme-switching ensembles. For distance measures, the observations and models ensemble members are similarly spaced from each other for MMEs, whereas for the SMEs, the observations are generally well outside the ensemble. We suggest that multi-model ensembles should represent an important component of uncertainty analysis. 相似文献
106.
107.
On June 14 2008, an Iwate–Miyagi inland earthquake that had a magnitude of 7.2 hit the eastern foot of the Ohu Mountains in
Tohoku district, Japan. The seismic peak ground acceleration was greater than 1,000 gal in the Aratozawa Dam area. The earthquake
triggered a massive landslide at the upper reach of the dam. The landslide had the sediment volume of over 67 million cubic
meters and is considered the largest catastrophic landslide in Japan during the last 100 years. This report presents a summary
of our findings pertinent to the landslide’s activities based on our field investigations that started the day after the landslide.
This report covers: (1) details of the land deformations caused by the landslide, (2) geological background pertinent to landslide
development, and (3) estimation of the slip surface and the other physical properties of the landslide based on the analysis
of the boring core specimens and landform features. The landslide is roughly divided into two sections, a lower and an upper
half. The lower half moved almost simultaneously as one massive block of 700 m long, 800 m wide, and 70–80 m thick. The slip
surface had developed on the very fine sand of the alternate layer of fine-grained sandstone and siltstone. The slickensided
slip surface has a gradient of only 2°. This feature indicates that the type of the landslide movement is considered to be
a block glide. The landslide body is nearly identical to the topography of the landslide area that was developed about 50,000 years ago. This shows the possibility that the landslide was reactivated. The upper half consists of two large ridges and the broad
debris field and is 600 m long, 900 m wide, and 70–100 m thick. The maximum height of the main scarp is over 150 m. 相似文献
108.
S. Noda M. Takeuti F. Abe I. A. Bond R. J. Dodd J. B. Hearnshaw M. Honda M. Honma J. Jugaku Y. Kan-ya Y. Kato P. M. Kilmartin Y. Matsubara K. Masuda Y. Muraki T. Nakamura K. Ohnishi M. Reid N. J. Rattenbury To. Saito Y. Saito H. Sato M. Sekiguchi J. Skuljan D. J. Sullivan T. Sumi R. Yamada T. Yanagisawa P. C. M. Yock M. Yoshizawa 《Monthly notices of the Royal Astronomical Society》2004,348(4):1120-1134
109.
Kinoshita D. Watanabe J. Fukushima H. Sekiguchi T. Yamamoto N. Abe S. 《Earth, Moon, and Planets》1997,77(3):265-269
A sequential imaging observation of the ion tail of Comet C/Hale-Bopp 1995O1 was carried out in February–March 1997 with a
wide-field CCD imaging camera using narrow band filters for two ion species; CO+ and H2O+ along with those for blue and red continuum. From the surface photometry of the ion tail of two species, we derived a relationship
between plasma density and distance from the nucleus. The local velocity of the ion flow as a function of the distance from
the nucleus was also estimated on the basis of some assumptions. We report preliminary results of our analysis, and discuss
some characteristics of cometary plasma and its interaction with interplanetary magnetic field (IMF).
May the source be with you!
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
110.
T. Guillot L. Abe A. Agabi J.‐P. Rivet J.‐B. Daban D. Mkarnia E. Aristidi F.‐X. Schmider N. Crouzet I. Gonalves C. Gouvret S. Ottogalli H. Faradji P.‐E. Blanc E. Bondoux F. Valbousquet 《Astronomische Nachrichten》2015,336(7):638-656
The installation and operation of a telescope in Antarctica represent particular challenges, in particular the requirement to operate at extremely cold temperatures, to cope with rapid temperature fluctuations and to prevent frosting. Heating of electronic subsystems is a necessity, but solutions must be found to avoid the turbulence induced by temperature fluctuations on the optical paths. ASTEP 400 is a 40cm Newton telescope installed at the Concordia station, Dome C since 2010 for photometric observations of fields of stars and their exoplanets. While the telescope is designed to spread star light on several pixels to maximize photometric stability, we show that it is nonetheless sensitive to the extreme variations of the seeing at the ground level (between about 0′′.1 and 5′′) and to temperature fluctuations between –30°C and –80 °C. We analyze both day‐time and night‐time observations and obtain the magnitude of the seeing caused by the mirrors, dome and camera. The most important effect arises from the heating of the primary mirror which gives rise to a mirror seeing of 0′′.23 K–1. We propose solutions to mitigate these effects. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献