71 research outputs found
The use of hyoid bone dimensions in age and sex estimation in a Turkish population: a cone-beam computed tomography study
Background: The aim of the study was to determine sex and age from hyoid bone morphology on cone-beam computed tomography (CBCT).
Materials and methods: The study sample compromised 130 CBCT images. Eight different measurements were performed for each hyoid bone. Fusion conditions were assigned to each side of the hyoid bone separately as; unfused, partially fused, and total fused.
Results: The Hyoid length (Hyd-L), width of the left proximal end (LP-W) and stature variables showed sexual dimorphism in all hyoid fusion types (p < 0.05). In young adult age group, a significant difference was found between sex and fusion types (p = 0.025). The body length (B-L) (81.35%) and stature measurements (76.25%) contributed most significantly to sex estimation.
Conclusions: Patient’s CBCT scans which enable reproducible and reliable measurements for bone tissues, can be used for forensic procedures. Hyoid bone measurements with CBCT are useful methodology for age and sex estimation in forensic sciences with high accuracy predictive rates
Consistent Treatment of Relativistic Effects in Electrodisintegration of the Deuteron
The influence of relativistic contributions to deuteron electrodisintegration
is systematically studied in various kinematic regions of energy and momentum
transfer. As theoretical framework the equation-of-motion and the unitarily
equivalent S-matrix approaches are used. In a (p/M)-expansion, all leading
order relativistic -exchange contributions consistent with the Bonn OBEPQ
model are included. In addition, static heavy meson exchange currents including
boost terms, -currents, and -isobar contributions
are considered. Sizeable effects from the various relativistic two-body
contributions, mainly from -exchange, have been found in inclusive form
factors and exclusive structure functions for a variety of kinematic regions.Comment: 41 pages revtex including 15 postscript figure
General Survey of Polarization Observables in Deuteron Electrodisintegration
Polarization observables in inclusive and exclusive electrodisintegration of
the deuteron using a polarized beam and an oriented target are systematically
surveyed using the standard nonrelativistic framework of nuclear theory but
with leading order relativistic contributions included. The structure functions
and the asymmetries corresponding to the various nucleon polarization
components are studied in a variety of kinematic regions with respect to their
sensitivity to realistic -potential models, to subnuclear degrees of
freedom in terms of meson exchange currents, isobar configurations and to
relativistic effects in different kinematical regions, serving as a benchmark
for a test of present standard nuclear theory with effective degrees of
freedom.Comment: 56 pages, 32 figures, revtex
Dust detection by the wave instrument on STEREO: nanoparticles picked up by the solar wind?
The STEREO/WAVES instrument has detected a very large number of intense
voltage pulses. We suggest that these events are produced by impact ionisation
of nanoparticles striking the spacecraft at a velocity of the order of
magnitude of the solar wind speed. Nanoparticles, which are half-way between
micron-sized dust and atomic ions, have such a large charge-to-mass ratio that
the electric field induced by the solar wind magnetic field accelerates them
very efficiently. Since the voltage produced by dust impacts increases very
fast with speed, such nanoparticles produce signals as high as do much larger
grains of smaller speeds. The flux of 10-nm radius grains inferred in this way
is compatible with the interplanetary dust flux model. The present results may
represent the first detection of fast nanoparticles in interplanetary space
near Earth orbit.Comment: In press in Solar Physics, 13 pages, 5 figure
Weak axial nuclear heavy meson exchange currents and interactions of solar neutrinos with deuterons
Starting from the axial heavy meson exchange currents, constructed earlier in
conjunction with the Bethe--Salpeter equation, we first present the axial
--, -- and meson exchange Feynman amplitudes that satisfy
the partial conservation of the axial current. Employing these amplitudes, we
derive the corresponding weak axial heavy meson exchange currents in the
leading order in the 1/M expansion ( is the nucleon mass), suitable for the
nuclear physics calculations beyond the threshold energies and with wave
functions obtained by solving the Schr\"odinger equation with one--boson
exchange potentials. The constructed currents obey the nuclear form of the
partial conservation of the axial current. We apply the space component of
these currents in calculations of the cross sections for the disintegration of
deuterons by low energy (anti)neutrinos. The deuteron and the final state
nucleon--nucleon wave functions are derived (i) from a variant of the OBEPQB
potential, and (ii) from the Nijmegen 93 and Nijmegen I nucleon-nucleon
interaction. The extracted values of the constant , entering the
axial exchange currents of the pionless effective field theory, are in a
reasonable agreement with its value predicted by the dimensional analysis.Comment: 34 pages, 3 figures, 11 table
Four years of Ulysses dust data: 1996 to 1999
The Ulysses spacecraft is orbiting the Sun on a highly inclined ellipse (, perihelion distance 1.3 AU, aphelion distance 5.4 AU). Between
January 1996 and December 1999 the spacecraft was beyond 3 AU from the Sun and
crossed the ecliptic plane at aphelion in May 1998. In this four-year period
218 dust impacts were recorded with the dust detector on board. We publish and
analyse the complete data set of both raw and reduced data for particles with
masses to g. Together with 1477 dust impacts
recorded between launch of Ulysses and the end of 1995 published earlier
\cite{gruen1995c,krueger1999b}, a data set of 1695 dust impacts detected with
the Ulysses sensor between October 1990 and December 1999 is now available. The
impact rate measured between 1996 and 1999 was relatively constant with about
0.2 impacts per day. The impact direction of the majority of the impacts is
compatible with particles of interstellar origin, the rest are most likely
interplanetary particles. The observed impact rate is compared with a model for
the flux of interstellar dust particles. The flux of particles several
micrometers in size is compared with the measurements of the dust instruments
on board Pioneer 10 and Pioneer 11 beyond 3 AU (Humes 1980, JGR, 85,
5841--5852, 1980). Between 3 and 5 AU, Pioneer results predict that Ulysses
should have seen five times more ( sized) particles than
actually detected.Comment: accepted by Planetary and Space Science, 22 pages, 8 figures (1
colour figure
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