Fabric for micrometeoroid protection garment Patent

Structure of fabric layers for micrometeoroid protection garment with capability for eliminating heat shorts for use in manufacturing space suit

Improved heat-resistant garments

Fabrication method for protective clothing eliminates the common heat-short by avoiding the stitch which is common to all layers, and preventing external exposure of any stitch to the outer environment. A unique overlap arrangement is described and additional protective methods are discussed

Orbital stability in combined uniform axial and three-dimensional wiggler magnetic fields for free-electron lasers

Zachary Phys. Rev. A 29 (6), 3224 (1984) recently analyzed the instability of relativistic-electron helical trajectories in combined uniform axial and helical wiggler magnetic fields when the radial variation of the wiggler field is taken into account. It is shown here that the type 2 instability comprised of secular terms growing linearly in time, identified by Zachary and earlier by Diament Phys. Rev. A 23 (5), 2537 (1981), is an artifact of simple perturbation theory. A multiple-time-scale perturbation analysis reveals a nonsecular evolution on a slower time scale which accommodates an arbitrary initial perturbation. It is shown that, in the absence of exponential instability, the electron seeks a modified helical orbit more appropriate to its perturbed state and oscillates stably about it. Thus, the perturbed motion is oscillatory but nonsecular, and hence the helical orbits are stable

Changing clinical behaviour by making guidelines specific

Efforts to get doctors to follow guidelines have overlooked the importance of clear and concise recommendation

The effects of non-linear electron-phonon interactions on superconductivity and charge-density-wave correlations

Determinant quantum Monte Carlo (DQMC) simulations are used to study non-linear electron-phonon interactions in a two-dimensional Holstein-like model on a square lattice. We examine the impact of non-linear electron-lattice interactions on superconductivity and on Peierls charge-density-wave (CDW) correlations at finite temperatures and carrier concentrations. We find that the CDW correlations are dramatically suppressed with the inclusion of even a small non-linear interaction. Conversely, the effect of the non-linearity on superconductivity is found to be less dramatic at high temperatures; however, we find evidence that the non-linearity is ultimately detrimental to superconductivity. These effects are attributed to the combined hardening of the phonon frequency and a renormalization of the effective linear electron-phonon coupling towards weaker values. These results demonstrate the importance of non-linear interactions at finite carrier concentrations when one is addressing CDW and superconducting order and have implications for experiments that drive the lattice far from equilibrium.Comment: 5 Pages, 5 Figure

Constraints on viewing geometries from radio observations of γ\gamma-ray-loud pulsars using a novel method

We present radio intensity and polarisation profiles of 28 $\gamma$-ray-detected pulsars with the aim of putting constraints on their viewing geometries using data from the Parkes telescope. Constraints are formed both from the goodness-of-fit of the position angles to the Rotating Vector Model and from the beam opening angle considering aberration and retardation effects. Uncertainties on the relevant parameters are systematically taken into account in order to produce a more robust constraint, using a new approach. Surprisingly, we find that the distribution of the magnetic inclination angle ($\alpha$) in this subset of pulsars peaks at low values, contrary to the predictions of $\gamma$-ray models. We find a lack of correlation between these and a set of $\alpha$ values which were derived using $\gamma$-ray light curves, suggesting a problem in the interpretation of the data in one or both of these domains. Finally, we also show that the $\alpha$ distribution of pulsars with multiple radio components is no different to that of single-component pulsars.Comment: 23 pages, 31 figures Submitted to MNRA

Neutron interference scattering in crystalline solids Progress report

Neutron elastic and inelastic interference scattering cross section in crystalline lattices of solid