328 research outputs found
Comparison of Different Anthropometric Measurements and Inflammatory Biomarkers
Introduction. Different anthropometric variables have been shown to be related to cardiovascular morbidity and mortality. Our aim was to compare the association between different anthropometric measurements and inflammatory status. Methods and results. A cross-sectional study design in which we analyzed the data collected during a five-year period in the Tel Aviv Medical Center Inflammation Survey (TAMCIS). Included in the study were 13,033 apparently healthy individuals at a mean (SD) age of 43. Of these, 8,292 were male and 4,741 female. A significant age-adjusted and multiple-adjusted partial correlation was noted between all anthropometric measurements and all inflammatory biomarkers. There was no significant difference in the correlation coefficients between different biomarkers and anthropometric variables. Conclusion. Most of the common used anthropometric variables are similarly correlated with inflammatory variables. The clinician can choose the variable that he/she finds easiest to use
Chaotic to ordered state transition of cathode-sheath instabilities in DC glow discharge plasmas
Transition from chaotic to ordered state has been observed during the initial
stage of a discharge in a cylindrical dc glow discharge plasma. Initially it
shows a chaotic behavior but increasing the discharge voltage changes the
characteristics of the discharge glow and shows a period substraction of order
7 period 5 period 3 period 1 period i.e. the system goes to
single mode through odd cycle subtraction. On further increasing the discharge
voltage, the system goes through period doubling, like 1 period 2 period
4 period. On further increasing the voltage, the system goes to stable
state without having any oscillations.Comment: chathode-sheath, instabilities, chaos, period-subtraction,
bifurcation, dc-discharg
Exact closed form analytical solutions for vibrating cavities
For one-dimensional vibrating cavity systems appearing in the standard
illustration of the dynamical Casimir effect, we propose an approach to the
construction of exact closed-form solutions. As new results, we obtain
solutions that are given for arbitrary frequencies, amplitudes and time
regions. In a broad range of parameters, a vibrating cavity model exhibits the
general property of exponential instability. Marginal behavior of the system
manifests in a power-like growth of radiated energy.Comment: 17 pages, 7 figure
The Amorium Project: Excavation and Research in 2001
The 2001 season, which lasted for six weeks by Dr. Ali Kaya of the Stileyman Demirel Uni versity, Isparta, was carried out on the Upper City mound in the area of the visible remains of from 24 July through 4 September, saw an upturn in the fortunes of the Amorium Project. Better funding and a larger team enabled us to an apsidal building, presumed to be a church. Sabri Aydal of the Antalya Archaeological Mu seum returned to complete his survey of the carry out a more extensive program of work and so produce more results than circum site, and his topographical plan extends over an area of 250 hectares, encompassing not only stances had allowed in previous years.' The first four weeks were devoted to an intensive exca the intramural settlement but also the necropo lis to the south and west of the city (Fig. A). vation campaign focused on the Lower City En Site enhancement and conservation work closure area in accordance with the five-year plan initiated in 1998.2 At the same time geo continued throughout the season, although more emphasis was given to this essential work physical survey work, conducted by a team led during the last two weeks. With th
Stationary solutions of the one-dimensional nonlinear Schroedinger equation: II. Case of attractive nonlinearity
All stationary solutions to the one-dimensional nonlinear Schroedinger
equation under box or periodic boundary conditions are presented in analytic
form for the case of attractive nonlinearity. A companion paper has treated the
repulsive case. Our solutions take the form of bounded, quantized, stationary
trains of bright solitons. Among them are two uniquely nonlinear classes of
nodeless solutions, whose properties and physical meaning are discussed in
detail. The full set of symmetry-breaking stationary states are described by
the character tables from the theory of point groups. We make
experimental predictions for the Bose-Einstein condensate and show that, though
these are the analog of some of the simplest problems in linear quantum
mechanics, nonlinearity introduces new and surprising phenomena.Comment: 11 pages, 9 figures -- revised versio
Stability of stationary states in the cubic nonlinear Schroedinger equation: applications to the Bose-Einstein condensate
The stability properties and perturbation-induced dynamics of the full set of
stationary states of the nonlinear Schroedinger equation are investigated
numerically in two physical contexts: periodic solutions on a ring and
confinement by a harmonic potential. Our comprehensive studies emphasize
physical interpretations useful to experimentalists. Perturbation by stochastic
white noise, phase engineering, and higher order nonlinearity are considered.
We treat both attractive and repulsive nonlinearity and illustrate the
soliton-train nature of the stationary states.Comment: 9 pages, 11 figure
A Feature-Driven Active Framework for Ultrasound-Based Brain Shift Compensation
A reliable Ultrasound (US)-to-US registration method to compensate for brain
shift would substantially improve Image-Guided Neurological Surgery. Developing
such a registration method is very challenging, due to factors such as missing
correspondence in images, the complexity of brain pathology and the demand for
fast computation. We propose a novel feature-driven active framework. Here,
landmarks and their displacement are first estimated from a pair of US images
using corresponding local image features. Subsequently, a Gaussian Process (GP)
model is used to interpolate a dense deformation field from the sparse
landmarks. Kernels of the GP are estimated by using variograms and a discrete
grid search method. If necessary, the user can actively add new landmarks based
on the image context and visualization of the uncertainty measure provided by
the GP to further improve the result. We retrospectively demonstrate our
registration framework as a robust and accurate brain shift compensation
solution on clinical data acquired during neurosurgery
On Correctness of Data Structures under Reads-Write Concurrency
Abstract. We study the correctness of shared data structures under reads-write concurrency. A popular approach to ensuring correctness of read-only operations in the presence of concurrent update, is read-set validation, which checks that all read variables have not changed since they were first read. In practice, this approach is often too conserva-tive, which adversely affects performance. In this paper, we introduce a new framework for reasoning about correctness of data structures under reads-write concurrency, which replaces validation of the entire read-set with more general criteria. Namely, instead of verifying that all read conditions over the shared variables, which we call base conditions. We show that reading values that satisfy some base condition at every point in time implies correctness of read-only operations executing in parallel with updates. Somewhat surprisingly, the resulting correctness guarantee is not equivalent to linearizability, and is instead captured through two new conditions: validity and regularity. Roughly speaking, the former re-quires that a read-only operation never reaches a state unreachable in a sequential execution; the latter generalizes Lamport’s notion of regular-ity for arbitrary data structures, and is weaker than linearizability. We further extend our framework to capture also linearizability. We illus-trate how our framework can be applied for reasoning about correctness of a variety of implementations of data structures such as linked lists.
Photonic quantum ring laser
We report a quantum ring-like toroidal cavity naturally formed in a
vertical-cavity-like active microdisk plane due to Rayleigh's band of
whispering gallery modes. The -dependent redshift and a square-law
property of microampere-range threshold currents down to 2 A are
consistent with a photonic quantum wire view, due to whispering gallery
mode-induced dimensional reduction.Comment: 4 pages, 5 figures, REVTEX, Submitted to Phys. Rev. Lett. 06/08/98,
revised 10/28/98, To appear in Phys. Rev. Lett., Vol. 82(3), Jan. 199
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