1,378 research outputs found
Classical Liquids in Fractal Dimension
We introduce fractal liquids by generalizing classical liquids of integer
dimensions to a fractal dimension . The particles composing
the liquid are fractal objects and their configuration space is also fractal,
with the same non-integer dimension. Realizations of our generic model system
include microphase separated binary liquids in porous media, and highly
branched liquid droplets confined to a fractal polymer backbone in a gel. Here
we study the thermodynamics and pair correlations of fractal liquids by
computer simulation and semi-analytical statistical mechanics. Our results are
based on a model where fractal hard spheres move on a near-critical percolating
lattice cluster. The predictions of the fractal Percus-Yevick liquid integral
equation compare well with our simulation results.Comment: Changed titl
TESTING DECEPTION WITH A COMMERCIAL TOOL SIMULATING CYBERSPACE
Deception methods have been applied to the traditional domains of war (air, land, sea, and space). In the newest domain of cyber, deception can be studied to see how it can be best used. Cyberspace operations are an essential warfighting domain within the Department of Defense (DOD). Many training exercises and courses have been developed to aid leadership with planning and to execute cyberspace effects that support operations. However, only a few simulations train cyber operators about how to respond to cyberspace threats. This work tested a commercial product from Soar Technologies (Soar Tech) that simulates conflict in cyberspace. The Cyberspace Course of Action Tool (CCAT) is a decision-support tool that evaluates defensive deception in a wargame simulating a local-area network being attacked. Results showed that defensive deception methods of decoys and bait could be effective in cyberspace. This could help military cyber defenses since their digital infrastructure is threatened daily with cyberattacks.Marine Forces Cyberspace CommandChief Petty Officer, United States NavyChief Petty Officer, United States NavyApproved for public release. Distribution is unlimited
PCN25 COST-EFFECTIVENESS-ANALYSIS OF THE THERAPY OF STAGETI-T2 PROSTATE CANCER WITH PERMANENT SEED IMPLANTATION IN COMPARISON WITH RADICAL PROSTATECTOMY
Concurrent TNFRSF1A R92Q and pyrin E230K mutations in a child with multiple sclerosis
We report a 16-year-old female patient with a severe course of multiple sclerosis and concomitant symptoms suggestive of a hereditary autoinflammatory disease. Genetic analyses revealed that she inherited a TNFRSF1A R92Q mutation from her mother and a pyrin E230K mutation from her father. To our knowledge, this is the first report of a patient with severe childhood multiple sclerosis and mutations in two genes which predispose to hereditary autoinflammatory disorders. We speculate that these mutations contribute to early multiple sclerosis manifestation and enhance the inflammatory damage inflicted by the autoimmune response
High temperature superconducting thin film microwave circuits: Fabrication, characterization, and applications
Epitaxial YBa2Cu3O7 films were grown on several microwave substrates. Surface resistance and penetration depth measurements were performed to determine the quality of these films. Here the properties of these films on key microwave substrates are described. The fabrication and characterization of a microwave ring resonator circuit to determine transmission line losses are presented. Lower losses than those observed in gold resonator circuits were observed at temperatures lower than critical transition temperature. Based on these results, potential applications of microwave superconducting circuits such as filters, resonators, oscillators, phase shifters, and antenna elements in space communication systems are identified
On the estimation of normal copula discrete regression models using the continuous extension and simulated likelihood
The continuous extension of a discrete random variable is amongst the
computational methods used for estimation of multivariate normal copula-based
models with discrete margins. Its advantage is that the likelihood can be
derived conveniently under the theory for copula models with continuous
margins, but there has not been a clear analysis of the adequacy of this
method. We investigate the asymptotic and small-sample efficiency of two
variants of the method for estimating the multivariate normal copula with
univariate binary, Poisson, and negative binomial regressions, and show that
they lead to biased estimates for the latent correlations, and the univariate
marginal parameters that are not regression coefficients. We implement a
maximum simulated likelihood method, which is based on evaluating the
multidimensional integrals of the likelihood with randomized quasi Monte Carlo
methods. Asymptotic and small-sample efficiency calculations show that our
method is nearly as efficient as maximum likelihood for fully specified
multivariate normal copula-based models. An illustrative example is given to
show the use of our simulated likelihood method
Fractal Liquids
We introduce fractal liquids by generalizing classical liquids of integer dimensions d=1,2,3 to a fractal dimension df. The particles composing the liquid are fractal objects and their configuration space is also fractal, with the same non-integer dimension. Realizations of our generic model system include microphase separated binary liquids in porous media, and highly branched liquid droplets confined to a fractal polymer backbone in a gel. Here we study the thermodynamics and pair correlations of fractal liquids by computer simulation and semi-analytical statistical mechanics. Our results are based on a model where fractal hard spheres move on a near-critical percolating lattice cluster. The predictions of the fractal Percus-Yevick liquid integral equation compare well with our simulation results
Millimeter wave transmission studies of YBa2Cu3O7-delta thin films in the 26.5 to 40.0 GHz frequency range
Millimeter wave transmission measurements through YBa2Cu3O(7-delta) thin films on MgO, ZrO2 and LaAlO3 substrates, are reported. The films (approx. 1 micron) were deposited by sequential evaporation and laser ablation techniques. Transition temperatures T sub c, ranging from 89.7 K for the Laser Ablated film on LaAlO3 to approximately 72 K for the sequentially evaporated film on MgO, were obtained. The values of the real and imaginary parts of the complex conductivity, sigma 1 and sigma 2, are obtained from the transmission data, assuming a two fluid model. The BCS approach is used to calculate values for an effective energy gap from the obtained values of sigma sub 1. A range of gap values from 2 DELTA o/K sub B T sub c = 4.19 to 4.35 was obtained. The magnetic penetration depth is evaluated from the deduced values of sigma 2. These results are discussed together with the frequency dependence of the normalized transmission amplitude, P/P sub c, below and above T sub c
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