Gas hydrates are a costly problem when they plug oil and gas pipelines. The best way to determine the HFT and pressure is to measure these conditions experimentally for every gas system. Since this is not practical in terms of time and money, correlations are the other alternative tools. There are a small number of correlations for specific gravity method to predict the hydrate formation. As th...

of a thesis at the University of Miami. Any prediction based on numerical model contains uncertainty. The Deepwater Horizon oil spill forecast is a challenge due to the difficulty in measuring key parameters and the complexity in predicting the oil fate. Monte-Carlo (MC) sampling are applied to quantify the forecast uncertainties in an integral oil plume model simulating the Deepwater Horizon o...

Influence of gas density on simulated snoring. G. Liistro, C. Veriter, D. Stanescu. #ERS Journals Ltd 1999. ABSTRACT: According to a recent theoretical model, snoring is related to instability of the upper airway (UA). Factors promoting UA instability include increased gas density. The aim of this study was to test the influence of gas density on simulated snoring production and supraglottic re...

We study the early stage of the formation of seed supermassive black holes via direct collapse in dark matter (DM) haloes, in the cosmological context. We perform high-resolution zoomin simulations of such collapse at high z. Using the adaptive mesh refinement code ENZO, we resolve the formation and growth of a DM halo, until its virial temperature reaches ∼104 K, atomic cooling turns on, and c...

Understanding and modeling of three-phase transient flow in gas-condensate wells play a vital role in designing and optimizing dynamic kill procedure of each well that needs to capture the discontinuities in density, geometry, and velocity of phases but also the effect of temperature on such parameters. In this study, two-phase Advection-Upstream-Splitting-Method (AUSMV) hybrid scheme is extend...

We analyze galaxies in 300 nearby groups and clusters identified in the Sloan Digital Sky Survey using a photometric gas mass indicator that is useful for estimating the degree to which the interstellar medium of a cluster galaxy has been depleted. We study the radial dependence of inferred gas mass fractions for galaxies of different stellar masses and stellar surface densities. At fixed clust...

Context. Previous Spitzer and IRAS observations of the LMC suggest an excess of FIR emission with respect to the gas surface density traced by 12CO rotational emission lines and H i 21 cm emission. This so-called “FIR excess” is especially noticeable near molecular clouds in the LMC, and has usually been interpreted as indicating the presence of a self-shielded H2 component not traced by CO in ...

The density-tapered plasmas have been considered as a key source to overcome the dephasing problem, which is a very important energy saturation mechanism in laser wakefield acceleration (LWFA). In the most researches, the tapered plasma density is used after electron injection, but when no electron trapping happens, it may also support the high energy electron generation. For this purpose, we s...

In a search for the signature of turbulence in the diffuse interstellar medium in gas density distributions, we determined the probability distribution functions (PDFs) of the average volume densities of the diffuse gas. The densities were derived from dispersion measures and H I column densities towards pulsars and stars at known distances. The PDFs of the average densities of the diffuse ioni...

The properties of the Magellanic Stream constrain the density of coronal gas in the distant Galactic halo. We show that motion through ambient gas can strongly heat Stream clouds, driving mass loss and causing evaporation. If the ambient gas density is too high, then evaporation occurs on unreasonably short timescales. Since heating dominates drag, tidal stripping appears to be responsible for ...