3,326 research outputs found
Novel Quaternary Dilute Magnetic Semiconductor (Ga,Mn)(Bi,As): Magnetic and Magneto-Transport Investigations
Magnetic and magneto-transport properties of thin layers of the
(Ga,Mn)(Bi,As) quaternary dilute magnetic semiconductor grown by the
low-temperature molecular-beam epitaxy technique on GaAs substrates have been
investigated. Ferromagnetic Curie temperature and magneto-crystalline
anisotropy of the layers have been examined by using magneto-optical Kerr
effect magnetometry and low-temperature magneto-transport measurements.
Postgrowth annealing treatment has been shown to enhance the hole concentration
and Curie temperature in the layers. Significant increase in the magnitude of
magnetotransport effects caused by incorporation of a small amount of Bi into
the (Ga,Mn)As layers revealed in the planar Hall effect (PHE) measurements, is
interpreted as a result of enhanced spin-orbit coupling in the (Ga,Mn)(Bi,As)
layers. Two-state behaviour of the planar Hall resistance at zero magnetic
field provides its usefulness for applications in nonvolatile memory devices.Comment: 10 pages, 3 figures, to be published in the Proceedings of ICSM-2016
conferenc
Model of a quantum particle in spacetime
Doplicher, Fredenhagen, and Roberts (1994, 1995) proposed a simple model of a
particle in quantum spacetime. We give a new formulation of the model and
propose some small changes and additions which improve the physical
interpretation. In particular, we show that the internal degrees of freedom e
and m of the particle represent external forces acting on the particle. To
obtain this result we follow a constructive approach. The model is formulated
as a covariance system. It has projective representations in which not only the
spacetime coordinates but also the conjugated momenta are two-by-two
noncommuting. These momenta are of the form P_mu-(b/c)A_mu, where b is the
charge of the particle. The electric and magnetic fields obtained from the
vector potential A_mu coincide with the variables e and m postulated by DFR.
Similarly, the spacetime position operators are of the form Q_mu-(al^2/hbar c)
Omega_mu where a is a generalized charge, l a fundamental length, and with
vector potentials Omega_mu which are in some sense dual w.r.t. the A_mu.Comment: revtex, 8 page
The truncated moment problem on N0
We find necessary and sufficient conditions for the existence of a probability measure on N0, the nonnegative integers, whose first n moments are a given n-tuple of nonnegative real numbers. The results, based on finding an optimal polynomial of degree n which is nonnegative on N0 (and which depends on the moments), and requiring that its expectation be nonnegative, generalize previous results known for n=1, n=2 (the Percus–Yamada condition), and partially for n=3. The conditions for realizability are given explicitly for n≤5 and in a finitely computable form for n≥6. We also find, for all n, explicit bounds, in terms of the moments, whose satisfaction is enough to guarantee realizability. Analogous results are given for the truncated moment problem on an infinite discrete semi-bounded subset of R
Signal reconstruction in the EM end-cap calorimeter and check with cosmic data in the region 0< eta <3.2
In 2007, the electromagnetic end-cap calorimeter joined the ATLAS commissioning effort. Since then, calibration and cosmic muon runs are taken regularly, allowing to set-up, debug and test in situ the signal reconstruction. These are the first data in the 1.4500 MeV) have been used to perform a systematic and quantitative comparison between data and predicted physics pulse shapes in a coherent way over the entire calorimeter coverage, 0< eta <3.2. This represents the first attempt to unify barrel and end-cap in situ data in a common analysis. Results are similar in the barrel and the end-cap, only slightly worse for the latter as expected from its more complex geometry. This is the first proof of the quality of an ATLAS-like signal reconstruction in the end-caps, despite its challenging aspect, and gives confidence that the energy reconstruction is in good control over the complete electromagnetic calorimeter coverage 0< eta <3.2
Covariance systems
We introduce new definitions of states and of representations of covariance
systems. The GNS-construction is generalized to this context. It associates a
representation with each state of the covariance system. Next, states are
extended to states of an appropriate covariance algebra. Two applications are
given. We describe a nonrelativistic quantum particle, and we give a simple
description of the quantum spacetime model introduced by Doplicher et al.Comment: latex with ams-latex, 23 page
Aging is associated with an earlier arrival of reflected waves without a distal shift in reflection sites
Background-Despite pronounced increases in central pulse wave velocity (PWV) with aging, reflected wave transit time (RWTT), traditionally defined as the timing of the inflection point (T-INF) in the central pressure waveform, does not appreciably decrease, leading to the controversial proposition of a "distal-shift" of reflection sites. T-INF, however, is exceptionally prone to measurement error and is also affected by ejection pattern and not only by wave reflection. We assessed whether RWTT, assessed by advanced pressure-flow analysis, demonstrates the expected decline with aging. Methods and Results-We studied a sample of unselected adults without cardiovascular disease (n=48; median age 48 years) and a clinical population of older adults with suspected/established cardiovascular disease (n=164; 61 years). We measured central pressure and flow with carotid tonometry and phase-contrast MRI, respectively. We assessed RWTT using wave-separation analysis (RWTTWSA) and partially distributed tube-load (TL) modeling (RWTTTL). Consistent with previous reports, T-INF did not appreciably decrease with age despite pronounced increases in PWV in both populations. However, aging was associated with pronounced decreases in RWTTWSA (general population -15.0 ms/decade, P<0.001; clinical population -9.07 ms/decade, P=0.003) and RWTTTL (general -15.8 ms/decade, P<0.001; clinical -11.8 ms/decade, P<0.001). There was no evidence of an increased effective reflecting distance by either method. TINF was shown to reliably represent RWTT only under highly unrealistic assumptions about input impedance. Conclusions-RWTT declines with age in parallel with increased PWV, with earlier effects of wave reflections and without a distal shift in reflecting sites. These findings have important implications for our understanding of the role of wave reflections with aging
Dynamic Effects of Food Consistency on Chewing Motions
The purpose of the study was to find evidence of how different types of food consistency
affect chewing motions, especially the forward, downward and sidewise extents of
motion of the lower jaw. Nineteen individuals with intact tooth sequence, aged from 20
to 37 years, were asked to chew three types of food of different consistency (banana,
bread, carrot). The motions of the lower jaw were recorded by ELITE system, i.e. the
measurement instrument that by stereo-photo-grametric procedures calculates space
co-ordinates of markers on faces of the study subjects. The system enables continuous recording
of lower jaw motions in three dimensions, without any possibility of the study
subjects’ influencing the operation of the instrument, which significantly decreases the
possibility of error. Study results have shown that in all 19 subjects a greater food consistency
increases the extent of chewing motion. In each individual study subject different
average values were found for equal shifts of lower jaw when chewing the same type
of food. Although varying from subject to subject, the chewing cycle depends to a great
extent on food consistency. By increasing the consistency of a bite, the extent of lower jaw
motion has increased in every single study subject
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