Ion temperature and steady-state characteristics of a low density magnetoplasma column

1973 ◽  
Vol 15 (3) ◽  
pp. 227-241 ◽  
Author(s):  
E Oktay ◽  
J E Robinson
Keyword(s):  
Steady State ◽  
Low Density ◽  
Ion Temperature

scholarly journals Steady-state radiative cooling rates for low-density, high-temperature plasmas

1977 ◽  
Vol 20 (5) ◽  
pp. 397-439 ◽  
Author(s):  
D.E. Post ◽  
R.V. Jensen ◽  
C.B. Tarter ◽  
W.H. Grasberger ◽  
W.A. Lokke
Keyword(s):  
Steady State ◽  
High Temperature ◽  
Radiative Cooling ◽  
Low Density ◽  
Cooling Rates

Structure of a singly ionizing current sheet propagating in a low density gas

1970 ◽  
Vol 48 (15) ◽  
pp. 1769-1780 ◽  
Author(s):  
G. J. Pert
Keyword(s):  
Steady State ◽  
Current Sheet ◽  
Electric Fields ◽  
Mean Free Path ◽  
Transverse Magnetic ◽  
Low Density ◽  
Free Model ◽  
Ionization Region ◽  
Electron Mean Free Path ◽  
Two Fluid

The structure of a singly ionizing current sheet is examined under steady-state conditions. Convergent solutions are only found in the presence of ambient transverse magnetic and electric fields. A collision-free model is used to approximate to the ionization region in the front. This solution is cut off at the electron mean free path and matched to a collision-dominated magnetohydrodynamic two-fluid calculation for the back of the sheet. The conditions for the establishment of a steady state are examined for these solutions.

Simulation of an Industrial Linear Low Density Polyethylene Plant

2011 ◽  
Vol 6 (1) ◽  
Author(s):  
Ali Farhangiyan Kashani ◽  
Hossein Abedini ◽  
Mohammad Reza Kalaee
Keyword(s):  
Steady State ◽  
Average Molecular Weight ◽  
Molar Fraction ◽  
Operating Conditions ◽  
Low Density Polyethylene ◽  
Process Equipment ◽  
Flow Index ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Wide Range

In this paper, an industrial linear low density polyethylene (LLDPE) production process including two serried fluidized bed reactors (FBR) and other process equipment was completely simulated in steady state mode. Both of FBRs were considered like two serried continuous stirred tank reactors (CSTR). In this simulation, a kinetic model that is based on a multiple active site heterogeneous Ziegler-Natta catalyst was used for simulation of reactions in two FBRs. Simulator by using this model is able to predict the important attributes of LLDPE like melt flow index (MFI), density (ρ), polydispersity (PDI), numerical and weight average molecular weight (Mn, Mw) and co-polymer molar fraction (SFRAC). On the other hand, this simulator can be applied in wide range of changing in inlet operating conditions. The results of the simulation are compared with industrial data of LLDPE plant. A good agreement is observed between the simulator predictions and actual plant data. Finally, by using of the simulator, the steady state operating conditions for producing different grades of polyethylene are obtained.

scholarly journals The C:O Ratio in Dark Clouds with Cyclic Star Formation

1992 ◽  
Vol 150 ◽  
pp. 249-250
Author(s):  
L A M Nejad ◽  
D A Williams
Keyword(s):  
Steady State ◽  
Molecular Clouds ◽  
Stellar Winds ◽  
Low Density ◽  
Low Velocity ◽  
Low Mass Stars ◽  
Dark Clouds ◽  
Low Mass ◽  
Solid Phases ◽  
Phase Models

Observations (Goldsmith et al., 1986) indicate that the gas in dark clouds with embedded low-mass stars experiences a cycle, driven by stellar winds, between low and high density phases. The cycle time is sufficiently short that the chemistry never attains steady state. Icy mantles accumulating on grains during the collapse and dense core phases are thought to be removed in each cycle by low velocity shocks that terminate the low density phase. Models of this type give detailed point-by-point descriptions of both gas and solid phases in molecular clouds (Charnley et al., 1988; Nejad et al., 1990).

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