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Ion Acoustic Solitons in Dense Magnetized Plasmas with Nonrelativistic and Ultrarelativistic Degenerate Electrons and Positrons
submitted by soltcido 8 minutes ago - Topic: Geography
The propagation of electrostatic waves in a dense magnetized electron-positron-ion (EPI) plasma with nonrelativistic and ultrarelativistic degenerate electrons and positrons is investigated. The linear dispersion relation is obtained for slow and fast electrostatic waves in the EPI plasma. The limiting cases for ion acoustic wave (slow) and ion cyclotron wave (fast) are also discussed. Using th...



Cosmic Reionization on Computers. II. Reionization History and Its Back-reaction on Early Galaxies
submitted by soltcido 8 minutes ago - Topic: Geography
We compare the results from several sets of cosmological simulations of cosmic reionization, produced under the Cosmic Reionization On Computers project, with existing observational data on the high-redshift Lyα forest and the abundance of Lyα emitters. We find good consistency with the observational measurements and previous simulation work. By virtue of having several independent realizatio...

The Variable Hard X-Ray Emission of NGC 4945 as Observed by NuSTAR
submitted by soltcido 8 minutes ago - Topic: Geography
We present a broadband (~0.5-79 keV) spectral and temporal analysis of multiple NuSTAR observations combined with archival Suzaku and Chandra data of NGC 4945, the brightest extragalactic source at 100 keV. We observe hard X-ray (>10 keV) flux and spectral variability, with flux variations of a factor of two on timescales of 20 ks. A variable primary continuum dominates the high-energy spe...

Peptide Bond Formation through Gas-phase Reactions in the Interstellar Medium: Formamide and Acetamide as Prototypes
submitted by soltcido 8 minutes ago - Topic: Geography
A theoretical study of the reactions of ##IMG## [http://ej.iop.org/images/0004-637X/793/1/32/apj499750ieqn1.gif] {${rm NH}_4^+ $} with formaldehyde and ##IMG## [http://ej.iop.org/images/0004-637X/793/1/32/apj499750ieqn2.gif] {${rm CH}_5^+ $} with formamide is carried out. The viability of these gas-phase ion-molecule reactions as possible sources of formamide and acetamide under the conditions ...

Study of Redshifted H I from the Epoch of Reionization with Drift Scan
submitted by soltcido 8 minutes ago - Topic: Geography
Detection of the epoch of reionization (EoR) in the redshifted 21 cm line is a challenging task. Here, we formulate the detection of the EoR signal using the drift scan strategy. This method potentially has better instrumental stability compared to the case where a single patch of sky is tracked. We demonstrate that the correlation time between measured visibilities could extend up to 1-2 hr ...



Cosmic Reionization on Computers. I. Design and Calibration of Simulations
submitted by soltcido 8 minutes ago - Topic: Geography
Cosmic Reionization On Computers is a long-term program of numerical simulations of cosmic reionization. Its goal is to model fully self-consistently (albeit not necessarily from the first principles) all relevant physics, from radiative transfer to gas dynamics and star formation, in simulation volumes of up to 100 comoving Mpc, and with spatial resolution approaching 100 pc in physical units....

Supervised Detection of Anomalous Light Curves in Massive Astronomical Catalogs
submitted by soltcido 8 minutes ago - Topic: Geography
The development of synoptic sky surveys has led to a massive amount of data for which resources needed for analysis are beyond human capabilities. In order to process this information and to extract all possible knowledge, machine learning techniques become necessary. Here we present a new methodology to automatically discover unknown variable objects in large astronomical catalogs. With the ai...


Modeling MHD Accretion-Ejection—from the Launching Area to Propagation Scales
submitted by soltcido 8 minutes ago - Topic: Geography
We present the results of axisymmetric magnetohydrodynamic simulations investigating the launching of jets and outflows from a magnetically diffusive accretion disk. The time evolution of the disk structure is self-consistently taken into account. In contrast to previous works, we have applied spherical coordinates for the numerical grid, implying substantial benefits concerning the numerical r...

A Data-driven Approach for Retrieving Temperatures and Abundances in Brown Dwarf Atmospheres
submitted by soltcido 8 minutes ago - Topic: Geography
Brown dwarf spectra contain a wealth of information about their molecular abundances, temperature structure, and gravity. We present a new data driven retrieval approach, previously used in planetary atmosphere studies, to extract the molecular abundances and temperature structure from brown dwarf spectra. The approach makes few a priori physical assumptions about the state of the atmosphere. T...


Differential regulation of circadian melatonin rhythm and sleep-wake cycle by bright lights and nonphotic time cues in humans
submitted by colthrapi 11 minutes ago - Topic: Biology
Our previous study demonstrated that physical exercise under dim lights (5,000 lux) on exercise-induced acceleration of reentrainment because timed bright lights are known to reset the circadian pacemaker. Fifteen male subjects spent 12 days in temporal isolation. The sleep schedule was advanced from habitual sleep times by 8 h for 4 days, which was followed by a free-run session. In the shift ...

Toll-like receptors and hypertension
submitted by colthrapi 11 minutes ago - Topic: Biology
Hypertension and associated inflammatory processes that accelerate cardiovascular damage are regulated by the innate immune system. Toll-like receptors (TLR) are major components of the innate immune system that recognize endogenous damage-associated molecular patterns to activate prominent inflammatory signaling including activation of nuclear factor-B (NF-B). However, the role of TLR in the e...


Intrafetal glucose infusion alters glucocorticoid signaling and reduces surfactant protein mRNA expression in the lung of the late-gestation sheep fetus
submitted by colthrapi 11 minutes ago - Topic: Biology
Increased circulating fetal glucose and insulin concentrations are potential inhibitors of fetal lung maturation and may contribute to the pathogenesis of respiratory distress syndrome (RDS) in infants of diabetic mothers. In this study, we examined the effect of intrafetal glucose infusion on mRNA expression of glucose transporters, insulin-like growth factor signaling, glucocorticoid regulato...

Role of decidual natural killer cells, interleukin-15, and interferon-gamma in placental development and preeclampsia
submitted by colthrapi 11 minutes ago - Topic: Biology
Preeclampsia is a hypertensive, proteinuric disease that affects 5–10% of all pregnancies and is a leading cause of maternal and perinatal morbidity/mortality (Soto et al., J Matern Fetal Neonatal Med 25: 498–507, 2011). The primary treatment for preeclampsia still is delivery of the fetus and placenta. The underlying mechanisms remain elusive. One possibility is inadequate uterine ...

Reduction of classroom noise levels using group contingencies
submitted by ntgrzych 11 minutes ago - Topic: Health
The therapeutic workplace is an employment-based abstinence reinforcement intervention for unemployed drug users where trainees receive on-the-job employment skills training in a classroom setting. The study is an extension of prior therapeutic workplace research, which suggested that trainees frequently violated noise standards. Participants received real-time graphed feedback of noise levels ...

Expression of the P2Y2 receptor on the rat ocular surface during a 1-year rearing period
submitted by tormik97 12 minutes ago - Topic: Health
P2Y2 receptors are expressed on ocular surface tissues. Diquafosol ophthalmic solution (DIQUAS® ophthalmic solution 3 %; Santen Pharmaceutical Co., Ltd.) acts on these receptors and promotes the secretion of water and mucin. It has been shown to be an efficient dry eye treatment. If P2Y2 receptor expression on the ocular surface decreases with age, the effect of diquafosol may be reduced in e...