Shear and Vorticity in a Combined Einstein-Cartan-Brans-Dicke Inflationary Lambda-Universe

A combined BCDE (Brans-Dicke and Einstein-Cartan) theory with lambda-term is developed through Raychaudhuri's equation, for inflationary scenario. It involves a variable cosmological constant, which decreases with time, jointly with energy density, cosmic pressure, shear, vorticity, and Hubble's parameter, while the scale factor, total spin and scalar field increase exponentially. The post-inflationary fluid resembles a perfect one, though total spin grows, but the angular speed does not (Berman, 2007d). Keywords: Cosmology; Einstein; Brans-Dicke; Cosmological term; Shear; Spin; Vorticity; Inflation; Einstein-Cartan; Torsion. PACS: 04.20.-q ; 98.80.-k ; 98.80.Bp ; 98.80.JkComment: 8 pages including front one. Published versio

On the Machian Origin of Inertia

We examine Sciama's inertia theory: we generalise it, by combining rotation and expansion in one unique model, we find the angular speed of the Universe, and we stress that the theory is zero-total-energy valued. We compare with other theories of the same null energy background. We determine the numerical value of a constant which appears in the Machian inertial force expression devised by Graneau and Graneau[2], by introducing the above angular speed. We point out that this last theory is not restricted to Newtonian physics as those authors stated but is, in fact, compatible with other cosmological and gravitational theories. An argument by Berry[7] is shown in order to "derive" Brans-Dicke relation in the present context.Comment: 10 pages including front one. New version was accepted to publication by Astrophysics and Space Scienc

DNLS equation for large-amplitude solitons propagating in an arbitrary direction in a high-[beta] Hall plasma

The one-dimensional oblique propagation of magnetohydrodynamic waves with arbitrary amplitudes in a Hall plasma with isotropic pressure is studied under assumption that the plasma [beta] is large. It is shown that the wave evolution is described by the derivative nonlinear Schrödinger equation (DNLS)

Hedgerow agroforestry in England and Wales: increasing width to sequester additional carbon

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Propagation of solitons of the Derivative Nonlinear Schrodinger equation in a plasma with fluctuating density

The propagation of quasi-parallel nonlinear small-amplitude magnetohydrodynamic waves in a cold Hall plasma with fluctuating density is studied. The density is assumed to be a homogeneous random function of one spatial variable. The modified Derivative Nonlinear Schrodinger equation (DNLS) is derived with the use of the mean waveform method developed by Gurevich, Jeffrey, and Pelinovsky [Wave Motion 17, 287 (1993)], which is the generalization of the reductive perturbation method for nonlinear waves propagating in random media. This equation differs from the standard DNLS equation by one additional term describing the interaction of nonlinear waves with random density fluctuations. As an example of the use of the modified DNLS equation, the quasi-adiabatic evolution of a one-parametric DNLS soliton propagating through a plasma with fluctuating density is studied

Bovine papillomavirus: old system, new lessons?

No abstract available

Literature study report of plasticity induced anisotropic damage modeling for forming processes

A literature study report covering the topics; micromechanics of damage, continuum damage mechanics (gurson model and effective variable concept) and the dependence of damage on strain rate and temperature

Screening for Cognitive Impairment in Primary Brain Tumor Patients: A Preliminary Investigation with the MMSE and RBANS

Introduction: The prevalence of mild cognition impairment (MCI) among older adults (≥65) is estimated to range between 10-20% (Langa & Levine, 2014). Integrated primary care allows opportunities for interdisciplinary consultation, screening, and intervention. The aim of this study is to explore the percentage of older adults reporting cognitive concerns during their first primary care psychology visits. It is hypothesized that these rates will mirror prevalence rates in other older adult community dwelling samples in primary care settings. Methods: A patient sample of older adults (≥60) was introduced to services following a referral from their primary care physician. Clinicians then identified problems that were discussed in session, including “cognitive concerns.” Descriptive statistics will be used to assess the percentage of older adults with “cognitive concerns” in this sample, compared to other community dwelling samples. Results: 267 older adults were identified within a larger sample of patients who received primary care psychology services. The percentage of older adults who were referred for “cognitive concerns” was 10.5% (n = 28), with 12.7% (n = 34) reporting “cognitive concerns” during their visit. Interestingly of the 28 older adults referred by their provider for “cognitive concerns,” less than 50% (n = 13) of those patients reported “cognitive concerns” as one of their problems in session. Discussion: This sample of older adults reported cognitive concerns in primary care psychology sessions at a rate that falls within the range identified in other community dwelling samples. Future research could further improve upon identification and screening of older adults with cognitive concerns by psychologists in primary care settings, as intervention for MCI can improve quality of life and may delay progression of dementia (Campbell et al., 2018; Eshkoor et al., 2015).https://scholarscompass.vcu.edu/gradposters/1088/thumbnail.jp

Resonant magnetohydrodynamic waves in high-beta plasmas

When a global magnetohydrodynamic (MHD) wave propagates in a weakly dissipative inhomogeneous plasma, the resonant interaction of this wave with either local Alfven or slow MHD waves is possible. This interaction occurs at the resonant position where the phase velocity of the global wave coincides with the phase velocity of either Alfven or slow MHD waves. As a result of this interaction a dissipative layer embracing the resonant position is formed, its thickness being proportional to R-1/3, where R >> 1 is the Reynolds number. The wave motion in the resonant layer is characterized by large amplitudes and large gradients. The presence of large gradients causes strong dissipation of the global wave even in very weakly dissipative plasmas. Very often the global wave motion is characterized by the presence of both Alfven and slow resonances. In plasmas with small or moderate plasma beta beta, the resonance positions corresponding to the Alfven and slow resonances are well separated, so that the wave motion in the Alfven and slow dissipative layers embracing the Alfven and slow resonant positions, respectively, can be studied separately. However, when beta greater than or similar to R-1/3, the two resonance positions are so close that the two dissipative layers overlap. In this case, instead of two dissipative layers, there is one mixed Alfven-slow dissipative layer. In this paper the wave motion in such a mixed dissipative layer is studied. It is shown that this motion is a linear superposition of two motions, one corresponding to the Alfven and the other to the slow dissipative layer. The jump of normal velocity across the mixed dissipative layer related to the energy dissipation rate is equal to the sum of two jumps, one that occurs across the Alfven dissipative layer and the other across the slow dissipative layer