7,438 research outputs found
Introduction [to] Man Bac Biological Research Objectives
The principle aim of this volume is the examination and elucidation of the human
biology of the Man Bac cemetery population and associated faunal assemblages, in
order to reveal the micro-evolutionary history, palaeohealth, local palaeoenvironmental
conditions, subsistence strategies and general life-ways of this
ancient community. Building on previous Man Bac research we wish to provide a
wealth of new information about population history, colonisation, diet, nutrition,
adaptive shifts, and specific and general aspects of health in the current volume
Incommensurate-Commensurate Magnetic Phase Transition in SmRuAl
Magnetic properties of single crystalline SmRuAl have been
investigated by electrical resistivity, magnetic susceptibility, and specific
heat. We have confirmed the successive magnetic phase transitions at
K and K. Resonant x-ray diffraction has
also been performed to study the magnetic structures. Below , the
Sm moments order in an incommensurate structure with . The magnetic moments are oriented along the orthorhombic axis, which
coincides with the magnetization easy axis in the paramagnetic phase. A very
weak third harmonic peak is also observed at . The
transition at is a lock-in transition to the commensurate
structure described by . A well developed third harmonic peak
is observed at . From the discussion of the magnetic
structure, we propose that the long-range RKKY interaction plays an important
role, in addition to the strong nearest neighbor antiferromagnetic interaction.Comment: 11 pages, 12 figures, accepted in PR
Stable Existence of Phase IV inside Phase II under Pressure in CeLaB
We investigate the pressure effect of the electrical resistivity and
magnetization of CeLaB. The situation in which phase IV
stably exists inside phase II at H=0 T could be realized by applying a pressure
above GPa. This originates from the fact that the stability of
phase II under pressure is larger than those of phases IV and III. The results
seem to be difficult to reproduce by taking the four interactions of
-type AFO, -type AFQ, -type AFO, and AF
exchange into account within a mean-field calculation framework.Comment: 4 pages, 5 figures, to appear in J. Phys. Soc. Jpn. 79 (2010) No.
Effects of applied pressure on hot-pressing of Beta-SiC
The effects of applied pressure on the densification during hot pressing of beta-SiC compacts were investigated. Beta-SiC powder is Starck made and has the average particle size of about 0.7 micrometer. Hot pressing experiments were carried out in graphite dies at temperatures of 1700 deg to 2300 deg C and at the pressures up to 1000 kg/sq cm. The compacts containing 1 weight percent B4C were examined. Sintered compacts were examined for microstructure and the Rockwell A-scale hardness was measured. The B4C addition was very effective to mitigate the hot pressing conditions. It is found that densification goes with the strengthening of the bonding and does not occur in particle deformation due to concentrated stress
On Hasse--Schmidt derivations: the action of substitution maps
We study the action of substitution maps between power series rings as an
additional algebraic structure on the groups of Hasse--Schmidt derivations.
This structure appears as a counterpart of the module structure on classical
derivations.Comment: 42 pages; Dedicated to Antonio Campillo on the occasion of his 65th
birthday; minor corrections; final versio
Passive Earth Pressure During Earthquakes
In order to investigate characteristics of the passive earth pressure during earthquakes against the front face of the part of sheet pile walls driven into the ground, dynamic earth pressure tests were performed by using a large scale oscillating soil bin. A movable wall from which inertial effects were eliminated was used in this study. The wall was moved toward sand filled in the bin during oscillation. The angle Φm deduced by inserting the observed peak wall load and wall friction angle at the maximum inertia force into the logarithmic spiral method was coincided with that of the static condition. The change in the wall friction angle induced by oscillation should not be neglected in an estimation of passive earth pressure during earthquake
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