Introduction: It has been shown that low levels of pigmentation increase susceptibility to noise-induced hearing loss in humans. For this reason, white populations develop more pronounced noise- induced hearing loss in comparison to black populations. Similarly, blue-eyed individuals exhibit greater temporary threshold shift than brown-eyed subjects; still, no strong correlation has been veri...

We study the possibility that light dark matter can be produced with right relic density by decay of other sector particles. this in a model right-handed neutrinos, singlet scalar and fermion. The heavier gives rise to lighter fermion which serves as candidate. show scalar. find mass GeV scale or MeV interaction is very weak. have GeV-TeV weak interactions Standard Model (SM) So, scenario, has ...

The high-frequency cutoff of the semicircular canals is unknown but probably also lies above 5 Hz. The high-frequency cutoff of the extraocular muscles is 1 Hz. so that central mechanisms (that introduce phase lead) must compensate from 1 to 5 Hz. The pursuit system begins to cut off between 0.5 to 1 Hz. so that it can compensate for slow head movements while the vestibular system compensates f...

The experiment was conducted to determine the effects of different photoperiods and darkness on the growth and survival of juvenile Catla catla in the laboratory for 90 days. Fishes were divided into four aquaria (10 fish per aquarium), and subjected to different photoperiod regimes of 8 hours light: 16 hours dark (8L:16D), 16 hours light: 8 hours dark (16L:8D), continuous light (24L:0D) and co...

An interesting possibility for dark matter is a scalar particle of mass of order 10 MeV – 1 GeV, interacting with a U(1) gauge boson (dark photon) which mixes with the photon. We present a simple and natural model realizing this possibility. The dark matter arises as a composite pseudo Nambu-Goldstone boson (dark pion) in a non-Abelian gauge sector, which also gives a mass to the dark photon. F...

We show how light spin-1 2 or spin-0 particles may be acceptable Dark Matter candidates, provided they annihilate sufficiently strongly through new interactions, such as those induced by a new light neutral spin-1 boson U. The corresponding interaction is stronger than weak interactions at lower energies, but weaker at higher energies. Annihilation cross sections of (axially coupled) spin-1 2 D...

Recent world events have once again reinforced my belief that we are indeed very fortunate. In March, we watched helplessly as friends, family, and colleagues in Japan were devastated by earthquakes and tsunamis, and continue to watch the saga of a nuclear disaster unfold. Not so long ago, we witnessed the devastation in Haiti, in Australia, and again in New Zealand, as thousands of lives were ...

accepted Abstract. In a recent paper, Hawkins (1997) argues on the basis of statistical studies of double-image gravita-tional lenses and lens candidates that a large population of dark lenses exists and that these outnumber galaxies with more normal mass-to-light ratios by a factor of 3:1. If correct, this is a very important result for many areas of astronomy including galaxy formation and co...