Spectral splits of neutrinos as a BCS-BEC crossover type phenomenon

We show that the spectral split of a neutrino ensemble which initially consists of electron type neutrinos, is analogous to the BCS-BEC crossover already observed in ultra cold atomic gas experiments. Such a neutrino ensemble mimics the deleptonization burst of a core collapse supernova. Although these two phenomena belong to very different domains of physics, the propagation of neutrinos from highly interacting inner regions of the supernova to the vacuum is reminiscent of the evolution of Cooper pairs between weak and strong interaction regimes during the crossover. The Hamiltonians and the corresponding many-body states undergo very similar transformations if one replaces the pair quasispin of the latter with the neutrino isospin of the former.Comment: 9 pages, 5 figure

Stabilization of Linear Systems Over Gaussian Networks

The problem of remotely stabilizing a noisy linear time invariant plant over a Gaussian relay network is addressed. The network is comprised of a sensor node, a group of relay nodes and a remote controller. The sensor and the relay nodes operate subject to an average transmit power constraint and they can cooperate to communicate the observations of the plant's state to the remote controller. The communication links between all nodes are modeled as Gaussian channels. Necessary as well as sufficient conditions for mean-square stabilization over various network topologies are derived. The sufficient conditions are in general obtained using delay-free linear policies and the necessary conditions are obtained using information theoretic tools. Different settings where linear policies are optimal, asymptotically optimal (in certain parameters of the system) and suboptimal have been identified. For the case with noisy multi-dimensional sources controlled over scalar channels, it is shown that linear time varying policies lead to minimum capacity requirements, meeting the fundamental lower bound. For the case with noiseless sources and parallel channels, non-linear policies which meet the lower bound have been identified

Hymenoptera of Nide province: Studies on Sphecidae fauna

The present study is based on 1240 specimens obtained from the field studies in the vicinity of Ankara province in Turkey between the years of 2006 - 2008. In fauna studies carried out in Nide province between May 2006 - October 2008, the specimens of Sphecinae Latreille, 1802, PempheredoninaeDahlbom, 1835, Astatianae Lepeletier, 1845, Crabroninae Latreille, 1802, Bembicinae Latreille, 1802, Philanthinae Latreille, 1802 sub-families belonging to Sphecidae family were collected. 52 of the collected specimens are new records for Nide province. Astata pontica Pulawski, 1958 species is anew record for Turkey

Insect chromosomes preparing methods for genetic researches

Cytogenetics are almost always based on the examination of the fixed mitotic chromosomes during the analyses of metaphase. During this phase of the cycle of cells, the DNA is folded up and chromatin is strongly condensed. The relative position of the centromere is constant, which means that the ratio of the lengths of the two arms is constant for each chromosome. Importantly, each chromosome displays a unique banding pattern. Different staining methods showed the banding pattern (g band), centromere position (c band), cytophotometric estimation and specific DNA regions (FISH). This study aims to show the important chromosome staining methods

Neutrino Constraints on the Dark Matter Total Annihilation Cross Section

In the indirect detection of dark matter through its annihilation products, the signals depend on the square of the dark matter density, making precise knowledge of the distribution of dark matter in the Universe critical for robust predictions. Many studies have focused on regions where the dark matter density is greatest, e.g., the Galactic Center, as well as on the cosmic signal arising from all halos in the Universe. We focus on the signal arising from the whole Milky Way halo; this is less sensitive to uncertainties in the dark matter distribution, and especially for flatter profiles, this halo signal is larger than the cosmic signal. We illustrate this by considering a dark matter model in which the principal annihilation products are neutrinos. Since neutrinos are the least detectable Standard Model particles, a limit on their flux conservatively bounds the dark matter total self-annihilation cross section from above. By using the Milky Way halo signal, we show that previous constraints using the cosmic signal can be improved on by 1-2 orders of magnitude; dedicated experimental analyses should be able to improve both by an additional 1-2 orders of magnitude.Comment: 8 pages, 4 figures; Matches version published in Phys. Rev.

Nonequilibrium phase transitions and stationary state solutions of a three-dimensional random-field Ising model under a time dependent periodic external field

Nonequilibrium behavior and dynamic phase transition properties of a kinetic Ising model under the influence of periodically oscillating random-fields have been analyzed within the framework of effective field theory (EFT) based on a decoupling approximation (DA). Dynamic equation of motion has been solved for a simple cubic lattice ($q=6$) by utilizing a Glauber type stochastic process. Amplitude of the sinusoidally oscillating magnetic field is randomly distributed on the lattice sites according to bimodal and trimodal distribution functions. For a bimodal type of amplitude distribution, it is found in the high frequency regime that the dynamic phase diagrams of the system in temperature versus field amplitude plane resemble the corresponding phase diagrams of pure kinetic Ising model. Our numerical results indicate that for a bimodal distribution, both in the low and high frequency regimes, the dynamic phase diagrams always exhibit a coexistence region in which the stationary state (ferro or para) of the system is completely dependent on the initial conditions whereas for a trimodal distribution, coexistence region disappears depending on the values of system parameters.Comment: 11 pages, 11 figure

Effective field theory analysis of 3D random field Ising model on isometric lattices

Ising model with quenched random magnetic fields is examined for single Gaussian, bimodal and double Gaussian random field distributions by introducing an effective field approximation that takes into account the correlations between different spins that emerge when expanding the identities. Random field distribution shape dependencies of the phase diagrams and magnetization curves are investigated for simple cubic, body centered and face centered cubic lattices. The conditions for the occurrence of reentrant behavior and tricritical points on the system are also discussed in detail.Comment: 13 pages, 8 figure

Preliminary study and Identification of insects’ species of forensic importance in Urmia, Iran

The proper identification of the insect and arthropod species of forensic importance is the most crucial element in the field of forensic entomology. The main objective in this study was the identification of insects’ species of forensic importance in Urmia (37°, 33 N. and 45°, 4, 45 E.) and establishment of a preliminary data-base for forensic entomology purposes in Iran for the first time. A combination of various body viscera and tissues of some of vertebrates (sheep, cow, fish and hen), such as head, paunch, spleen, intestine, derma and liver was exposed in an open land on the private possession for 53 days. Ambient daily temperature (maximum and minimum) and relative humidity values were recorded; and existing keys were used for identification of different species. During the period of study, rainfall was none; average total temperature was 23.77°C; and average of mean RH or average total RH was 46.41%. Five stages of decomposition were recognized. A total of 3179 individuals were collected; belonging to 5 orders (Diptra, Coleoptera, Hymenoptera, Dermaptera and Blattaria), 11 families, 16 genera and 18 species: Psychoda sp, (Dip. Psychodidae), Calliphora vicina (Dip. Calliphoridae),Calliphora vomitoria (Dip. Calliphoridae), Lucilia sericata (Dip. Calliphoridae), Chrysoma sp. (Dip.Calliphoridae), Musca domestica (Dip. Muscidae), Muscina stabulans (Dip. Muscidae), Fannia canicularis (Dip. Fannidae), Sarcophaga haemorrhoidalis (Dip. Sarcophagidae), Sarcophaga sp. (Dip.Sarcophagidae), Wohlfartia magnifica (Dip. Sarcophagidae), Dermestes maculates (Col. Dermestidae), Necrophorus sp.(Col.Silphidae), Blatta orientalis (Blattaria . Blattidae), Vespula germanica (Hym.Vespidae), Messor caducus (Hym. Formicidae), Cataglyphis sp. (Hym. Formicidae) andForficula auricularia (Dermaptera. Forficulidae). The species of Psychoda sp, (Dip. Psychodidae), M. caducus, Cataglyphis sp. (Hym. Formicidae) and F. auricularia (Dermaptera. Forficulidae) are seldomly reported in previous researches; and they were heavily focused to tissues of animals in these studies

Strong Upper Limits on Sterile Neutrino Warm Dark Matter

Sterile neutrinos are attractive dark matter candidates. Their parameter space of mass and mixing angle has not yet been fully tested despite intensive efforts that exploit their gravitational clustering properties and radiative decays. We use the limits on gamma-ray line emission from the Galactic Center region obtained with the SPI spectrometer on the INTEGRAL satellite to set new constraints, which improve on the earlier bounds on mixing by more than two orders of magnitude, and thus strongly restrict a wide and interesting range of models.Comment: 4 pages, 2 figures; minor revisions, accepted for publication in Physical Review Letter

Teachers' beliefs and practices about oral corrective feedback in university EFL classes

This study examined (in)congruences between beliefs and practices of EFL university teachers on in‐class oral corrective feedback (OCF). The participants were 20 university English language teachers from a private university in Turkey. Data were collected via video‐recorded non‐participant detached observation, a task about OCF to determine the beliefs of the teachers, and a stimulated recall interview. The results showed incongruence between what the teachers said they believed and what they did. However, teachers’ beliefs and practices were similar regarding whether the errors should be corrected, when errors should be corrected, and who should correct them. Particularly notable in this study was the finding that those teachers with the greatest incongruence almost always stood by their decisions, even after they watched their unsuccessful OCF practices