scholarly journals The super-soft source phase of the recurrent nova V3890Sgr

2021 ◽  
Author(s):  
J.-U. Ness ◽  
A.P. Beardmore ◽  
P. Bezak ◽  
A. Dobrotka ◽  
J.J. Drake ◽  
...  
Keyword(s):  
Recurrent Nova ◽  
Source Phase

Iono-molecular Separation with Composite Membranes VI. Nitro-phenol separation through sulfonated polyether ether ketone on capillary polypropylene membranes

2018 ◽  
Vol 69 (7) ◽  
pp. 1603-1607
Author(s):  
Ion Spiridon Din ◽  
Anca Maria Cimbru ◽  
Abbas Abdul Kadhim Klaif Rikabi ◽  
Szidonia Katalin Tanczos ◽  
Simona Ticu (Cotorcea) ◽  
...  
Keyword(s):  
Flow Rate ◽  
Water Solubility ◽  
Composite Membranes ◽  
Membrane System ◽  
Polyether Ether Ketone ◽  
Molecular Separation ◽  
Capillary Membrane ◽  
Sulfonated Polyether Ether Ketone ◽  
Source Phase ◽  
Receptor Phase

The importance of removing and / or separating nitro phenols from aqueous solutions through membranes is substantiated by the multitude of recent research in the field, which broadly justifies both the economic and ecological reasons of such an approach. The present paper outlines the results of the transfer of nitro phenols through a membrane system made up of PPET impregnated polypropylene capillaries (PP) impregnated with sulfonate polyetheretherketone (SPEEK). The experiments were carried out in a PP-SPEEK capillary membrane module, with a useful size of 1 m2. Determinations made by using a 4 L / min flow rate source at a 5 mg / l nitrophenol concentration and pH 5 or pH 7, and the pH 12 receiving phase and a flow rate of 0.3 L / min, revealed that o- and p-nitrophenol were transferred much faster than m-nitrophenol (the flux is nearly double); the source phase of the system is concentrated in m-nitrophenol, and the receptor phase in o- and p-nitro phenols; the transfer data correlates with the higher water solubility of m-nitrophenol; mono nitro phenols transfer much faster than di nitrophenol, but both the mono and di nitrophenol streams decrease over time; after 4-5 hours of work, the mono nitrophenol concentration triples in the receiving phase, while the 2,4-dinitrophenol concentration doubles in the source phase.

The Shell of the Recurrent Nova T Pyxidis: A Model Based on Shocks

1997 ◽  
Vol 475 (2) ◽  
pp. 803-811 ◽  
Author(s):  
Marcella Contini ◽  
Dina Prialnik
Keyword(s):  
Model Based ◽  
Recurrent Nova

scholarly journals The symbiotic binary system RX Puppis: a possible recurrent nova with a Mira companion

1999 ◽  
Vol 305 (1) ◽  
pp. 190-210 ◽  
Author(s):  
J. Mikolajewska ◽  
E. Brandi ◽  
W. Hack ◽  
P. A. Whitelock ◽  
R. Barba ◽  
...  
Keyword(s):  
Binary System ◽  
Recurrent Nova

scholarly journals Liquid-liquid extraction and facilitated membrane transport of Pb2+ using a lipophilic acridono-crown ether as carrier

2020 ◽  
Vol 99 (1-2) ◽  
pp. 117-129
Author(s):  
Ádám Golcs ◽  
László Bezúr ◽  
Péter Huszthy ◽  
Tünde Tóth
Keyword(s):  
Membrane Transport ◽  
Metal Ion ◽  
Liquid Membrane ◽  
Competitive Inhibition ◽  
Liquid Extraction ◽  
Bulk Liquid ◽  
Bulk Liquid Membrane ◽  
Liquid Liquid Extraction ◽  
Component Systems ◽  
Source Phase

AbstractStudies on liquid-liquid extraction and bulk liquid membrane (BLM) technique-based metal ion separation by a previously published Pb2+-selective acridono-18-crown-6 ether selector molecule were performed. The effects of the stirring speed, the quality of apolar organic membrane, the counterions of Pb2+, the pH of the aqueous phase, the concentration of the source phase, the concentration of the carrier in the BLM and the temperature on the Pb2+-separation were investigated. Moreover, the effects of the competitive inhibition due to the presence of Ag+, Ca2+, Co2+, Cu2+, K+, Mg2+, Na+ and Zn2+ as competing ions in a multicomponent aqueous source phase of different ion-concentrations were also studied. After a proper dilution of the multicomponent aqueous source phase, excellent Pb2+-selectivity was achieved without a significant reduction in the efficiency compared to the liquid membrane transport of single-component systems. Based on the BLM-cell studies the applied selector molecule proved to be suitable for the development of liquid membrane-based Pb2+-selective separation methods, which can be greatly aided by the analysis of the effects on the separation and by the optimization of the parameters of the process discussed here.

scholarly journals A pre-outburst signal in the long-term optical light curve of the recurrent nova RS Ophiuchi

2011 ◽  
Vol 414 (3) ◽  
pp. 2195-2203 ◽  
Author(s):  
S. Adamakis ◽  
S. P. S. Eyres ◽  
A. Sarkar ◽  
R. W. Walsh
Keyword(s):  
Light Curve ◽  
Optical Light Curve ◽  
Recurrent Nova

scholarly journals A remarkable recurrent nova in M31: Discovery and optical/UV observations of the predicted 2014 eruption

2015 ◽  
Vol 580 ◽  
pp. A45 ◽  
Author(s):  
M. J. Darnley ◽  
M. Henze ◽  
I. A. Steele ◽  
M. F. Bode ◽  
V. A. R. M. Ribeiro ◽  
...  
Keyword(s):  
2014 Eruption ◽  
Recurrent Nova

Measurements of Rayleigh-wave phase velocities in Nevada: Implications for explosion sources and the Massachusetts Mountain earthquake

1982 ◽  
Vol 72 (4) ◽  
pp. 1329-1349
Author(s):  
H. J. Patton
Keyword(s):  
Rayleigh Wave ◽  
Rayleigh Waves ◽  
Moment Tensor ◽  
Test Site ◽  
P Wave ◽  
Stress Axis ◽  
Phase Velocities ◽  
Wave Phase ◽  
Single Station ◽  
Source Phase

abstract Single-station measurements of Rayleigh-wave phase velocity are obtained for paths between the Nevada Test Site and the Livermore broadband regional stations. Nuclear underground explosions detonated in Yucca Valley were the sources of the Rayleigh waves. The source phase φs required by the single-station method is calculated for an explosion source by assuming a spherically symmetric point source with step-function time dependence. The phase velocities are used to analyze the Rayleigh waves of the Massachusetts Mountain earthquake of 5 August 1971. Measured values of source phase for this earthquake are consistent with the focal mechanism determined from P-wave first-motion data (Fischer et al., 1972). A moment-tensor inversion of the Rayleigh-wave spectra for a 3-km-deep source gives a horizontal, least-compressive stress axis oriented N63°W and a seismic moment of 5.5 × 1022 dyne-cm. The general agreement between the results of the P-wave study of Fischer et al. (1972) and this study supports the measurements of phase velocities and, in turn, the explosion source model used to calculate φs.

scholarly journals The spectroscopic evolution of the recurrent nova T Pyxidis during its 2011 outburst

2013 ◽  
Vol 549 ◽  
pp. A140 ◽  
Author(s):  
S. N. Shore ◽  
G. J. Schwarz ◽  
I. De Gennaro Aquino ◽  
T. Augusteijn ◽  
F. M. Walter ◽  
...  
Keyword(s):  
Recurrent Nova

scholarly journals Recurrent Novae — A Review

2015 ◽  
Vol 2 (1) ◽  
pp. 246-251 ◽  
Author(s):  
K. Mukai
Keyword(s):  
Accretion Rate ◽  
Current Understanding ◽  
X Rays ◽  
Symbiotic Star ◽  
Classical Novae ◽  
Extensive Data ◽  
Star Evolution ◽  
Wide Range ◽  
Multi Wavelength ◽  
Recurrent Nova

In recent years, recurrent nova eruptions are often observed very intensely in wide range of wavelengths from radio to optical to X-rays. Here I present selected highlights from recent multi-wavelength observations. The enigma of T Pyx is at the heart of this paper. While our current understanding of CV and symbiotic star evolution can explain why certain subset of recurrent novae have high accretion rate, that of T Pyx must be greatly elevated compared to the evolutionary mean. At the same time, we have extensive data to be able to estimate how the nova envelope was ejected in T Pyx, and it turns to be a rather complex tale. One suspects that envelope ejection in recurrent and classical novae in general is more complicated than the textbook descriptions. At the end of the review, I will speculate that these two may be connected.

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