We discuss the results of a VLA 1 (Napier et al. 1983) Hi survey of the Boo otes void and compare the distribution and Hi properties of the void galaxies to those of galaxies found in a survey of regions of mean cosmic density. The Boo otes survey covers 1100 Mpc 3 , or 1% of the volume of the void and consists of 24 cubes of typically 2 Mpc 2 Mpc 1280 km s ?1 , centered on optically known gala...

Inhomogeneous universe models have been proposed as an alternative explanation for the apparent acceleration of the cosmic expansion that does not require dark energy. In the simplest class of inhomogeneous models, we live within a large, spherically symmetric void. Several studies have shown that such a model can be made consistent with many observations, in particular the redshift–luminosity ...

ion getLL() Get the lower-level abstraction of this entity. Void setLL(In Abstraction abst) Set the lower-level abstraction of this entity. Abstraction getHL() Get the higher-level abstraction of this entity. Void setHL(In abstraction abst) Set the higher-level abstraction of this entity. Operations on Factoriesion getHL() Get the higher-level abstraction of this entity. Void setHL(In abstracti...

Subchondral insufficiency fracture of the femoral head (SIFFH) is characterized by acute onset hip pain without overt trauma. It appears as a low intensity band with bone marrow edema on T1-weighted MRI. The most common course of treatment is protected weight bearing for a period of several weeks. Total hip arthroplasty (THA) has been commonly used if the patient does not respond to the initial...

Two-dimensional, nonequilibrium molecular dynamics simulations have been applied to study the structure of thin films grown on single-crystal Lennard-Jones substrates. The principal microstructural features to develop within these films are single vacancies and small voids which tend to be slightly elongated and to be aligned in the growth direction. Both the void volume and the mean surface ro...

Grain boundaries (GBs) are often the preferred sites for void nucleation in ductile metals. However, it has been observed that all boundaries do not contribute equally to this process. We present a mechanistic rationale for the role of GBs in damage nucleation in copper, along with a quantitative map for predicting preferred void nucleation at GBs based on molecular dynamics simulations in copp...

Using molecular dynamics with an accurate many-body potential, we studied the rapid expansion of Ta metal following the high compression ~50 to 100 GPa! induced by high velocity (2 to 4 km/s! impact. We find that catastrophic failure in this system coincides with a critical behavior characterized by a void distribution of the form N(v)}V, with t;2.2. This corresponds to a threshold in which per...

The current multi-layer insulation used in the extravehicular mobility unit (EMU) will not be effective in the atmosphere of Mars due to the presence of interstitial gases. Alternative thermal insulation means have been subjected to preliminary evaluation by NASA to attempt to identify a material that will meet the target conductivity of 0.005 W/m-K. This study analyzes numerically the thermal ...

L.K. Grunenfelder and S.R. Nutt 1. Department of Chemical Engineering and Materials Science, University of Southern California, Los Angeles, CA 90089-0241, USA *Corresponding author: [email protected] Abstract: Void formation as a function of resin moisture content was investigated to better understand and control process defects in composite parts made from prepreg. In this study, uncured prepr...

Void models provide a possible explanation of the “accelerated expansion” of the Universe without dark energy. To make the conventional void models more realistic, we allow the void, an underdense region around us, to be anisotropic and consider an average of the distance-redshift relations over the solid angle subtended at the observer. We first show that after taking the average of a form of ...