The spiral structure of the low surface brightness galaxies F568-6 (Malin 2) and UGC 6614 is large scale, with arms that wrap more than half a revolution, and extend out to 50 and 80 kpc in UGC 6614 and F568-6 respectively. The density contrasts observed in the H I maps are high, with arm/interarm contrasts of ∼2:1, whereas the velocity perturbations due to spiral structure are low, in the rang...

In this work, applicability of Particle in Cell-Monte Carlo Collisions (PIC-MCC) simulation method for better understanding of the plasma physical mechanisms and real important aspects of a plasma column driven by surface wave plasma discharges that is used in plasma antennas is examined. Via the implementation of geometry and physical parameters of the plasma column to an Object Oriented PIC-M...

Polyvinyl chloride supported silver molybdate composite material is used to develop by solution casting method. This membrane was characterized by various instrumental techniques such as Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and scanning electron microscopy (SEM) analyses. These characterizations are used to understand the functional groups,thermal sta...

Introduction: Successful aerobraking, aerocapture, and entry, descent, and landing (EDL) at Mars requires knowledge of the nominal atmospheric density as well as mesoscale and local weather conditions. Whether aerobraking at altitudes of the order 100 km, aerocapturing at 30-50 km, or performing an EDL sequence where maximum aerodynamic loads occur near 40 km followed by terminal descent to the...

near-surface variations can be very complex and may distort amplitudes and arrival times of the reflections events from target reflectors. near-surface complexities include topographic variations, near-surface irregularities, variations in soil conditions and the weathered layer. these perturbations generally have a significant impact on seismic recordings. although there is a general agreement...

We report on laboratory electromagnetic characterization of several hyper-dry synthesized and field collected Mars analog soils that match the type of soils identified by the TES [1] and OMEGA [2] on the Martian surface in order to experimentally investigate the dielectric properties of the sediments covering the Martian surface at the frequency range from 1 to 1000 MHz. Measurements were perfo...

A series of models of the lunar interior are derived from topographic, gravitational, librational, and seismic data. The librational parameters and low-degree gravity harmonics result primarily from surface height variations and only secondarily from lateral density variations. The moon departs from isostasy, even-for the low-degree harmonics, with a maximum superisostatic stress of 200 bars un...

Aflatoxins are secondary metabolites produced by Aspergillus flavus, A. parasiticus, A. tamari, A. bombycis and A. nomius species. Relative humidity (RH) is one of the most important parameters influencing the development of aflatoxins in pistachio orchards by Aspergillus species. The type of irrigation system affects density and frequency of the Aspergillus species in the soil. In the current ...

so far a number of works on the heat flux anomalies of the earth surface based on the satellite images and underground water as seismic precursors have been carried out. in this paper the soil temperature data at 1m depth (deep enough to filter temperature variation due to high frequency meteorological forcings) has been considered to see if there are connections between earthquakes in bam and ...

marine environment of the caspian sea, due to extensive human exploitation and discharge of large magnitudes of urban, industrial and agricultural waste, is under extensive pressure and human wastes threaten marine life and ecosystem of the sea. therefore, there is a substantial need for a good understanding of physical and chemical characteristics of the caspian waters. however, the data avail...