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Assessment of base capacity of open-ended tubular piles installed by the Rotary Cutting Press-in method
The ‘press-in’ method is a piling technique that installs piles with a static jacking force while obtaining a reaction force from previously installed piles. The applicable ground conditions of this method have been significantly expanded by the ‘Rotary Cutting Press-in (RCP)’ method, whereby a vertical jacking force and a torque are applied simultaneously onto a pile with cutting teeth on its base while water is injected around the pile base. In this paper, a method to estimate the base capacity of RCP piles is proposed based on UWA-05 framework. The proposed method utilizes CPT or SPT results as input parameters and estimates the plugging condition (Incremental Filling Ratio, IFR) from these results. Four static load tests on open-ended RCP piles were shown to be well-predicted by the proposed method in terms of the base capacity, regardless of the embedment depth into a bearing stratum.Giken Lt
Comparison of penetration resistance and vertical capacity of short piles installed by Standard Press-in in loose sand
Linking inherent anisotropy with liquefaction phenomena of granular materials by means of DEM analysis
New Nomenclature Rules for Meteor Showers Adopted
The Shower Database (SD) of the Meteor Data Center (MDC) had been operating
on the basis of stream-naming rules which were too complex and insufficiently
precise for 15 years. With a gradual increase in the number of discovered
meteor showers, the procedure for submitting new showers to the database and
naming them lead to situations that were inconsistent with the fundamental role
of the SD - the disambiguation of stream names in the scientific literature.
Our aim is to simplify the meteor shower nomenclature rules. We propose a much
simpler set of meteor shower nomenclature rules, based on a two-stage approach,
similar to those used in the case of asteroids. The first stage applies to a
new shower just after its discovery. The second stage concerns the repeatedly
observed shower, the existence of which no longer raises any doubts. Our
proposed new procedure was approved by a vote of the commission F1 of the IAU
in July 2022.Comment: Submitted to: New Astronomy Review
Modification of the Shower Database of the IAU Meteor Data Center
The Shower Database (SD) of the Meteor Data Center (MDC) has been operating
for 15 years and is used by the entire community of meteor astronomers. It
contains meteor showers categorised in individual lists on the basis of their
status. Since the inception of the SD, no objective rules for moving showers
between individual lists have been established. The content of the SD has not
yet been checked for the correctness of the meteor data contained therein. Our
aims are (1) to formulate criteria for nominating meteor showers for
established status, (2) to improve the rules for the removal of showers, (3) to
verify and enhance the content of the SD, and (4) to improve the user area of
the MDC SD. The criteria for moving showers from the Working list to the Lists
of established or removed Showers were generated using an empirical evaluation
of their impact on the registered showers. The correctness of the parameters of
each stream included in the SD was checked by comparing them with the values
given in the source publications. We developed a set of criteria for nominating
showers to be established. We objectified rules for the temporary and permanent
removal of meteor showers from the Working list. Both of our proposed new
procedures were approved by a vote of the commission F1 of the IAU in July
2022. We verified more than data records of the MDC SD and introduced
1700 corrections. We included new parameters for shower characterisation.
As a result of our verification procedure, 117 showers have been moved to the
List of removed showers. As of October 2022, the SD contains 923 showers, 110
of which are in the List of established Showers and 813 are in the Working
list. We also improved the user area of the SD and added a simple tool to allow
a quick check of the similarity of a new shower to those in the database
TOPORS (topoisomerase I binding, arginine/serine-rich)
Review on TOPORS (topoisomerase I binding, arginine/serine-rich), with data on DNA, on the protein encoded, and where the gene is implicated
An investigation on the liquefaction behavior of sandy sloped ground during the 1964 Niigata Earthquake
Deformation and cyclic strength characteristics of loose and medium-dense clean sand under sloping ground conditions: insights from cyclic undrained torsional shear tests with static shear
The effects of liquefaction on sloping ground often include the development of extremely large deformation. Although such
phenomenon has been repeatedly observed following major earthquakes, the triggering conditions are not fully understood yet. To provide
new insights into this issue, in this paper, results of two series of large-strain undrained cyclic torsional shear tests with initial static shear
conducted on loose and medium-dense Toyoura sand specimens (relative density of 25-30% and 44-48%) are presented and analyzed. The
post-liquefaction response of Toyoura sand is assessed in terms of failure modes and cyclic resistance up to 50% single amplitude shear strain.
It is shown that, depending on the combined magnitude of static and cyclic shear stresses, a sand in sloping ground will likely experience a
sudden development of large shear deformation (flow deformation) if initial liquefaction takes place, or a more progressive accumulation of
large residual deformation, which yet may bring sand to failure, when the onset of initial liquefaction is not achieved
Development and operational experience of magnetic horn system for T2K experiment
A magnetic horn system to be operated at a pulsed current of 320 kA and to
survive high-power proton beam operation at 750 kW was developed for the T2K
experiment. The first set of T2K magnetic horns was operated for over 12
million pulses during the four years of operation from 2010 to 2013, under a
maximum beam power of 230 kW, and protons were exposed to
the production target. No significant damage was observed throughout this
period. This successful operation of the T2K magnetic horns led to the
discovery of the oscillation phenomenon in 2013 by
the T2K experiment. In this paper, details of the design, construction, and
operation experience of the T2K magnetic horns are described.Comment: 22 pages, 40 figures, also submitted to Nuclear Instrument and
Methods in Physics Research,
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