We use a halo occupation approach to connect Mg II absorbers to dark matter halos as a function of redshift. Using the model constructed in Tinker & Chen (2008), we parameterize the conditional probability of an absorber of equivalent width Wr being produced by a halo of mass Mh at a given redshift, P(Wr|Mh,z). We constrain the free parameters of the model by matching the observed statistics of...

OBJECTIVES The purpose of this study was to determine exposure to whole-body vibration (WBV) and mechanical shock in rural workers who use quad bikes and to explore how personal, physical, and workplace characteristics influence exposure. METHODS A seat pad mounted triaxial accelerometer and data logger recorded full workday vibration and shock data from 130 New Zealand rural workers. Persona...

We present VLT-UVES echelle spectra of the Lyα emission and absorption in five radio galaxies at redshifts z=2.55–4.1. Together with data from our pilot study, we have a sample of 7 such systems with radio source sizes ∼ 1 − 90 kpc with which to address the origin of the absorbing gas. Echelle resolution again reveals that some systems with NHI > 10 cm in lower resolution data in fact consist o...

A methodology is proposed for designing a mathematical model shock absorbers; the proposal guided by characteristic diagrams of absorbers. These (Force-Displacement, Velocity-Acceleration) are easily constructed from experimental data generated standard tests. By analyzing at different frequencies interest, they can be classified into one seven patterns, to guide design model. Finally, identifi...

Frontal sinuses in goats and other mammals have been hypothesized to function as shock absorbers, protecting the brain from blows during intraspecific combat. Furthermore, sinuses are thought to form through removal of ;structurally unnecessary' bone. These hypotheses were tested using finite element modeling. Three-dimensional models of domesticated goat (Capra hircus) skulls were constructed,...

The use of modern materials and technical fluids allows you to operate cars at negative temperatures, but in some regions the world (for example, Siberia), ambient air temperature can fall below 243 K for several weeks or even months. operation trucks such a refers extreme conditions that force special preparation equipment. This consists not only maintenance, also carrying out activities are c...