97 research outputs found
Numerical Study on 3-Dimensional Behavior of a Damaged Pile Foundation during the 1995 Hyogo-ken Nanbu Earthquake
The purpose of this study is to investigate the process of the damage to a pile foundation located on a reclaimed land during the 1995 Hyogo-ken Nanbu earthquake. A 3-dimensional effective stress analysis using a soil-pile-building model was conducted on a damaged building. The five stories building tilted in a northeast direction because of serious damages to the pile foundations. Sand boils and ground settlements due to liquefaction were observed around the building. The simulated results showed that the reclaimed fill layer liquefied during the earthquake, and horizontal displacements of several tens centimeters occurred at the ground surface. The spatial distributions of the damages to piles were discussed through the 3-dimensional simulation. Consequently, the simulated failure direction of piles was associated with the observed direction of building inclination. The simulation qualitatively reproduced that the most serious damage of PHC piles occurred at the northeast footing among the footings located on the building corners
Effective Stress Analysis for Evaluating the Effect of the Sand Compaction Pile Method During the 1995 Hyogoken-Nambu Earthquake
The effect of the sand compaction pile method as a countermeasure for liquefaction mainly consists of three factors: increase in the density, increase in the horizontal effective stress and stabilization of microstructure. Proper evaluation of the effect of improvement is important for estimating the seismic behavior of the ground improved by the sand compaction pile method. How to incorporate the effect and its factors into an analytical model was investigated by simulating the seismic behavior of the ground at two sites during the 1995 Hyogoken-Nambu earthquake with the effective stress analysis method “FLIP.” It was found that not only the increase in the density but also increase in the horizontal effective stress were important in explaining the effect of the sand compaction pile method. Moreover, a model taking account of both sand piles and the improved ground between them suggested a possibility of reproducing the behavior of improved ground under large ground motions more properly
Physiological Markers of Motor Improvement Following Five-month Sprint Training in Young Boys
The 11th International Symposium on Adaptive Motion of Animals and Machines. Kobe University, Japan. 2023-06-06/09. Adaptive Motion of Animals and Machines Organizing Committee.Poster Session P4
Effect of CYP2C19 Polymorphism on Treatment Success in Lansoprazole-Based 7-Day Treatment Regimen for Cure of H. pylori Infection in Japan
Recently, Helicobacter pylori (H. pylori)-positive peptic ulcer patients were treated by a 1-week triple therapy [lansoprazole (LPZ) 30 mg, amoxicillin 750 mg and clarithromycin 200 or 400 mg, each twice daily] without the checking CYP2C19 genotype in Japan. This regimen was done to obtain sufficient cure rates for H. pylori infection using a high dose of LPZ (60 mg/day) without the great cost of having to determine the genotype. However, the failure rate for eradicating H. pylori was reported to be 12.5%. The reasons for this were studied in 33 Japanese patients with H. pylori-positive gastric or duodenal ulcer. Blood samples of the patients were collected to determine the genotype of CYP2C19 and plasma concentrations of LPZ and its metabolites at 3 h postdose on the morning of the 7th day of treatment. H. pylori infection was cured in 25 of the 33 patients (75.8%). The cure rate was highest in the group of poor metabolizers (PM), intermediate in the group of extensive metabolizers of the heterozygous type (htEM) and lowest in the group of extensive metabolizers of the homozygous type (hmEM). The relative ratio of mean plasma concentration for LPZ among the 3 groups was 1.00:1.43:2.93 (hmEM:htEM:PM groups). Our data suggest that success of the eradication is dependent on the CYP2C19-related genotypic status or the plasma concentrations of LPZ in a steady state condition after a multiple dosing regimen; that is to say, checking CYP2C19 is necessary even on occasions when treatment is done by H. pylori eradication methods as performed in Japan
Dose Measurements through the Concrete and Iron Shields under the 100 to 400 MeV Quasi-Monoenergetic Neutron Field (at RCNP, Osaka Univ.)
Shielding benchmark experiments are useful to verify the accuracy of calculation methods for the radiation shielding designs of high-energy accelerator facilities. In the present work, the benchmark experiments were carried out for 244- and 387-MeV quasi-monoenergetic neutron field at RCNP of Osaka University. Neutron dose rates through the test shields, 100-300 cm thick concrete and 40-100 cm thick iron, were measured by four kinds of neutron dose equivalent monitors, three kinds of wide-energy range monitors applied to high-energy neutron fields above 20 MeV and a conventional type rem monitor for neutrons up to 20 MeV, placed behind the test shields. Measured dose rates were compared one another. Measured results with the wide-energy range monitors were in agreement one another for both the concrete and the iron shields. For the conventional type rem monitor, measured results are smaller than those with the wide-energy range monitors for the concrete shields, while that are in agreements for the iron shields. The attenuation lengths were obtained from the measurements. The lengths from all the monitors are in agreement on the whole, though some differences are shown. These results are almost same as those from others measured at several hundred MeV neutron fields
CO Multi-line Imaging of Nearby Galaxies (COMING). III. Dynamical effect on molecular gas density and star formation in the barred spiral galaxy NGC 4303
We present the results of CO(=1-0) and CO(=1-0)
simultaneous mappings toward the nearby barred spiral galaxy NGC 4303 as a part
of the CO Multi-line Imaging of Nearby Galaxies (COMING) project. Barred spiral
galaxies often show lower star-formation efficiency (SFE) in their bar region
compared to the spiral arms. In this paper, we examine the relation between the
SFEs and the volume densities of molecular gas in the eight
different regions within the galactic disk with CO data combined with archival
far-ultraviolet and 24 m data. We confirmed that SFE in the bar region is
lower by 39% than that in the spiral arms. Moreover, velocity-alignment
stacking analysis was performed for the spectra in the individual regions. The
integrated intensity ratios of CO to CO () range from
10 to 17 as the results of stacking. Fixing a kinetic temperature of molecular
gas, was derived from via non-local thermodynamic
equilibrium (non-LTE) analysis. The density in the bar is lower
by 31-37% than that in the arms and there is a rather tight positive
correlation between SFEs and , with a correlation coefficient of
. Furthermore, we found a dependence of on the velocity
dispersion of inter-molecular clouds (). Specifically,
increases as increases when km s. On the other hand, decreases as increases when km s. These relations
indicate that the variations of SFE could be caused by the volume densities of
molecular gas, and the volume densities could be governed by the dynamical
influence such as cloud-cloud collisions, shear and enhanced inner-cloud
turbulence.Comment: 15 pages, 8 figures, accepted for publication in PAS
Research and development for accuracy improvement of neutron nuclear data on minor actinides
To improve accuracy of neutron nuclear data on minor actinides, a Japanese nuclear data project entitled “Research and development for Accuracy Improvement of neutron nuclear data on Minor ACtinides (AIMAC)” has been implemented. Several independent measurement techniques were developed for improving measurement precision at J-PARC/MLF/ANNRI and KURRI/LINAC facilities. Effectiveness of combining the independent techniques has been demonstrated for identifying bias effects and improving accuracy, especially in characterization of samples used for nuclear data measurements. Capture cross sections and/or total cross sections have been measured for Am-241, Am-243, Np-237, Tc-99, Gd-155, and Gd-157. Systematic nuclear data evaluation has also been performed by taking into account the identified bias effect. Highlights of the AIMAC project are outlined
CO Multi-line Imaging of Nearby Galaxies (COMING) IV. Overview of the Project
Observations of the molecular gas in galaxies are vital to understanding the
evolution and star-forming histories of galaxies. However, galaxies with
molecular gas maps of their whole discs having sufficient resolution to
distinguish galactic structures are severely lacking. Millimeter wavelength
studies at a high angular resolution across multiple lines and transitions are
particularly needed, severely limiting our ability to infer the universal
properties of molecular gas in galaxies. Hence, we conducted a legacy project
with the 45 m telescope of the Nobeyama Radio Observatory, called the CO
Multi-line Imaging of Nearby Galaxies (COMING), which simultaneously observed
147 galaxies with high far-infrared flux in CO, CO, and CO
lines. The total molecular gas mass was derived using the standard
CO-to-H conversion factor and found to be positively correlated with the
total stellar mass derived from the WISE m band data. The fraction of
the total molecular gas mass to the total stellar mass in galaxies does not
depend on their Hubble types nor the existence of a galactic bar, although when
galaxies in individual morphological types are investigated separately, the
fraction seems to decrease with the total stellar mass in early-type galaxies
and vice versa in late-type galaxies. No differences in the distribution of the
total molecular gas mass, stellar mass, and the total molecular gas to stellar
mass ratio was observed between barred and non-barred galaxies, which is likely
the result of our sample selection criteria, in that we prioritized observing
FIR bright (and thus molecular gas-rich) galaxies.Comment: Accepted for publication in PASJ; 47 pages, 5 tables, 29 figures.
On-line supplementary images are available at this URL
(https://astro3.sci.hokudai.ac.jp/~radio/coming/publications/). CO data is
available at the Japanese Virtual Observatory (JVO) website
(https://jvo.nao.ac.jp/portal/nobeyama/coming.do) and the project website
(https://astro3.sci.hokudai.ac.jp/~radio/coming/data/
Soil Movements Associated with Tunneling and Their Effects on an Adjacent Pile Foundation
The aim of this paper is to clarify the effect of tunneling in sand deposits upon the adjacent, existing structures with pile foundations. For this purpose, a series of laboratory model tests with a lowering-panel are performed. The lowering-panel is placed at the base of a container, on which an assembly of aluminum rods is made to rest, with or without a model pile-foundation being installed. The localized settlement to be created due to tunneling is simulated by allowing the lowering-panel to settle at a given rate. The associated displacement fields above the lowering-panel are measured by means of photographic techniques, and their correlation with the measured pile movements are discussed in detail. Furthermore, these experimental results are compared with results predicted from a new type of finite element analysis making full use of joint elements. It is then shown that there is good correlation between the measured and calculated results
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