نتایج جستجو برای: light and dark
تعداد نتایج: 16903915 فیلتر نتایج به سال:
The study aimed to estimate the effect of ecological factors such as day and night on catch species composition in fishing landings in the perisan Gulf in May 2016. In this study, were catched about 34937.18 kg marine speceis and identified of 64 groups of species and family including 56 groups of bonyfishes, 6 groups of invertabrate, 2 groups of cartilage fishes. Meanwhile, the Bushehr, Hormoz...
the purpose of this study was to investigate how english language teachers in mashhad who teach students in the pre-university cycle perceived the impact of the efltee on their teaching. the target population was nearly all pre-university english language teachers in seven districts of mashhad in the scholastic year 2008/2009. a survey questionnaire which consisted of (36) likert type items, wa...
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 ...
background. the color masking ability of a restoration plays a significant role in coveringa discolored substructure; how-ever, this optical property of zirconia ceramics has not been clearly determined yet. the aim of this in vitro study was to evaluate the color masking ability of a zirconia ceramic on substrates with different values. methods. ten zirconia disk specimens,0.5 mm in thickness ...
1. to determine whether difference in birth body mass influenced growth performance in pipistrellus kuhlii we studied a total of 12 captive-born neonates. bats were assigned to two body mass groups: light birth body mass (lbw: 0.89 ± 0.05, n=8) and heavy birth body mass (hbw: 1.35 ± 0.08, n=4). heavier body mass at birth was associated with rapid postnatal growth (body mass and forearm length) ...
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...
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