Absorption line studies of galaxies along the line-of-sight to distant quasars allow a direct observational link between the properties of the extended gaseous disk/halo and of the star forming region of galaxies. In these proceedings we review recent work on Ca ii absorbers detected in the SDSS at 0.4 < z < 1.3 which, because of their dust content and chemical properties, may lie spatially clo...

With close pairs of quasars at different redshifts, a background quasar sightline can be used to study a foreground quasar’s environment in absorption. We used a sample of 17 Lyman limit systems with column density NHI > 10 19 cm selected from 149 projected quasar pair sightlines, to investigate the clustering pattern of optically thick absorbers around luminous quasars at z ∼ 2.5. Specifically...

We present results from a survey of weak Mg ii absorbers in the VLT/UVES spectra of 81 QSOs obtained from the ESO archive. In this survey, we identified 112 weak Mg ii systems within the redshift interval 0.4 < z < 2.4 with 86 % completeness down to a rest-frame equivalent width of Wr(2796) = 0.02 Å, covering a cumulative redshift path length of ∆Z ∼ 77.3. From this sample, we estimate that the...

Selected structures intended to absorb impact energy have been analysed in respect of their use the rear underrun protective devices (RUPD) motor trucks. The main purpose RUPD is prevent a passenger car from running under truck provided with such device. From point view safety occupants, it important take into account components whose additional role would be part so that loads on said occupant...

The purpose of this research is to observe and understand the processes by which gamma rays are attenuated in passing through absorber, effects shielding geometry. Gamma ray linear attenuation coefficient, mass mean free path, half value layer buildup factor were evaluated for different absorbers, using 60Co source with energy 1.332 MeV. coefficient absorber such as aluminium was (0.1485 cm-1),...

As the experience of operating high-pressure spillway structures shows, conditions downstream extinguishing devices are very difficult. At flow rates, more than 12–15 m/s , damping devices, as a rule, operate in cavitation mode. First all, this mode operation gives rise to erosional destruction damper itself and waters near it. This occurs where torch closes on structure. Attempts avoid these d...

Vibration energy harvesting technology can capture ambient forms. Using an shock absorber (EHSA) is one of the methods to achieve this function. The EHSA with mechanical motion rectifier (MMR) has bifurcation, which improve performance and reduce impact between gears. However, bifurcation makes it difficult quantitatively predict vibrational dissipation MMR−EHSA. Evaluating MMR−EHSA during desi...