4,440 research outputs found
Super-family P2 C-96-125 observed by Japan-URSS Joint Emulsion Chamber Experiment
A detailed description of the event detected in the second chamber of Japan-URSS Collaboration is presented. A preliminary description was already published and from that time a careful microscopic scanning was carried out
Extremely high energy hadron and gamma-ray families(3). Core structure of the halo of superfamily
The study of the core structure seen in the halo of Mini-Andromeda 3(M.A.3), which was observed in the Chacaltaya emulsion chamber, is presented. On the assumption that lateral distribution of darkness of the core is exponential type, i.e., D=D0exp(-R/r0), subtraction of D from halo darkness is performed until the cores are gone. The same quantity on cores obtained by this way are summarized. The analysis is preliminary and is going to be developed
Letter of intent: the OPERA emulsion detector for a long-baseline neutrino-oscillation experiment
Biostratigraphic and magnetostratigraphic synthesis of the Celebes and Sulu Seas, Leg 124
During ODP Leg 124, late middle Eocene to Quaternary sediment sequences were recovered from 13 holes
drilled at five sites in the Celebes and Sulu basins. Paleomagnetic measurements and biostratigraphic studies using
calcareous nannofossils, planktonic and benthic foraminifers, radiolarians, and diatoms were completed and
summarized here. Two Neogene sediment sections recovered in the Sulu Basin yielded excellent core recoveries
and magnetic reversal records, allowing direct magnetobiostratigraphic correlations for the Pliocene and Quaternary
at Site 768 and for the middle Miocene to Quaternary at Site 769. The interpolated ages of biohorizons are not
consistent between sites and only a few of them are in good agreement with previous calibrations. The differences
may be the results of redeposition by turbidity currents and selective dissolution of key fossils
An empirical model to describe rapidity density and transverse momentum distributions
The distribution of rapidity density and transverse momentum is formulated empirically and analytically. It describes the data quite well over the wide energy range of √s = 22.4 – 7000 GeV
Research into the Retention Force of Electroformed Secondary Bar
INTRODUCTION: Electroformed metals are known to present good adaptability and biocompatibilities, but it is not yet known if the retention force of the electroformed secondary bar frame (ESBF) can endure long use. To clarify this point, the retention force between the primary cast bar and ESBF were measured.
MATERIAL AND METHODS: An edentulous model was prepared and four implants (Frialit 2) were embedded. The fabrication of the primary bar was cast from pure titanium. We coated the completed titanium bar with silver lacquer and applied 0.3mm thick electrodeposite. The ESBF was attached to the cast titanium primary bar, cyclical tests performed for 15000 cycles and the retention
force measured each time. The retention forces were measured in 37°C distilled water .
RESULTS: The retention force value dropped as the number of reseating increased. It was 22N after 1000, 19N after 5000, 18N after 10000 and 16N after 15000 cycles. The hysteresis curve indicated that the resistance during cyclical testing was constant and stable up until the completion of 15000 cycles.
CONCLUSION: The results confirmed that the retention force dropped gradually as the number of cycles increased, but that the stress imposed on the implants due to attaching and removal was low. This may be due to the excellent adaptation accuracy. In the case when repetition of attaching and removing for a long period is considerered,
we need an attachment to enable the provision of a stable retention force Supported by Wieland Edelmetalle
Potassium Abundances in Red Giants of Mildly to Very Metal-Poor Globular Clusters
A non-LTE analysis of K I resonance lines at 7664.91 and 7698.97 A was
carried out for 15 red giants belonging to three globular clusters of different
metallicity (M 4, M 13, and M 15) along with two reference early-K giants (rho
Boo and alpha Boo), in order to check whether the K abundances are uniform
within a cluster and to investigate the behavior of [K/Fe] ratio at the
relevant metallicity range of -2.5 <[Fe/H] < -1. We confirmed that [K/H] (as
well as [Fe/H]) is almost homogeneous within each cluster to a precision of <
~0.1 dex, though dubiously large deviations are exceptionally seen for two
peculiar stars showing signs of considerably increased turbulence in the upper
atmosphere. The resulting [K/Fe] ratios are mildly supersolar by a few tenths
of dex for three clusters, tending to gradually increase from ~+0.1-0.2 at
[Fe/H] ~-1 to ~+0.3 at [Fe/H] ~ -2.5. This result connects reasonably well with
the [K/Fe] trend of disk stars (-1 < [Fe/H]) and that of extremely metal-poor
stars (-4 <[Fe/H] < -2.5). That is, [K/Fe] appears to continue a gradual
increase from [Fe/H]~0 toward a lower metallicity regime down to [Fe/H]~-3,
where a broad maximum of [K/Fe]~+0.3-0.4 is attained, possibly followed by a
slight downturn at [Fe/H]<~-3.Comment: 13 pages, 4 tables, 6 figures, and 1 electronic table (accepted for
publication in Publ. Astron. Soc. Japan
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