Influence of membrane properties on fouling in MBRs

Marel, P. van der

doi:10.3990/1.9789036529266

Cited by 29 publications

(37 citation statements)

References 39 publications

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“…The consistency between the calculated and inferred GRB rates is achieved at ε/λ ≃ 0.16. Since quasars shine at L ≃ (0.1 − 1) L Ed (e.g., [10]), it implies that ε ≃ 0.016 − 0.16, which is consistent with available data [4]- [6]. The GRB rate as a function of redshift.…”

Section: Distribution Of Grb Rate In Redshiftsupporting

confidence: 81%

“…There are serious observational indications [4], [5], [6] that a fraction of galaxies with a central SMBH might be as high as ε ∼ 0.1 and that there is a correlation between the central SMBH mass, M h , and the luminosity of the host galaxy bulge, L s , which in a simplified form can be expressed as M h ≃ 10 −2.5 (L s /L ⊙ )M ⊙ . This correlation, taken together with the Schechter luminosity function of galaxies [7], gives the mass distribution of SMBHs,…”

Section: Fast Evolving Galactic Nucleimentioning

confidence: 99%

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GRB redshift distribution is consistent with GRB origin in evolved galactic nuclei

Dokuchaev¹,

Eroshenko²,

Ozernoy³

1999

The 9th Astrophysics Conference: After the Dark Ages, When Galaxies Were Young (The Universe at 2

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Abstract.Recently we have elaborated a new cosmological model of gamma-ray burst (GRB) origin [1], which employs the dynamical evolution of central dense stellar clusters in the galactic nuclei. Those clusters inevitably contain a large fraction of compact stellar remnants (CSRs), such as neutron stars (NSs) and stellar mass black holes (BHs), and close encounters between them result in radiative captures into shortliving binaries, with subsequent merging of the components thereby producing GRBs, typically at large distances from the nucleus.In the present paper, we calculate the redshift distribution of the rate of GRBs produced by close encounters of NSs in distant galactic nuclei. To this end, the following steps are undertaken: (i) we establish a connection between the parameters of the fast evolving central stellar clusters (i.e. those for which the time of dynamical evolution exceeds the age of the Universe) with masses of the forming central supermassive black holes (SMBHs) using a dynamical evolution model; (ii) we connect these masses with the inferred mass distributions of SMBHs in the galactic nuclei and the redshift distribution of quasars by assuming a certain 'Eddington luminosity phase' in their activity; (iii) we incorporate available observational data on the redshift distribution of quasars as well as a recently found correlation between the masses of galaxies and their central SMBHs. The resulting redshift distribution of the GRB rate, which accounts for both fast and slowly evolving galactic nuclei is consistent with that inferred from the BATSE data if the fraction of fast evolving galactic nuclei is in the range E _-_ 0.016 -0.16.

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Section: Distribution Of Grb Rate In Redshiftsupporting
confidence: 81%

Section: Fast Evolving Galactic Nucleimentioning
confidence: 99%

GRB redshift distribution is consistent with GRB origin in evolved galactic nuclei
Dokuchaev¹,
Eroshenko²,
Ozernoy³
1999
The 9th Astrophysics Conference: After the Dark Ages, When Galaxies Were Young (The Universe at 2
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“…In the present paper we only consider k → 0, relevant for optical experiments. The solution for general values of k will be presented elsewhere [13]. The limit k → 0 leads to a considerable simplification of the equations of motion, which in this case correspond exactly to an equivalent network model where each set of two neighbouring layers can be represented by a capacitance shunted by an induction.…”

Section: Resultsmentioning
confidence: 99%

Transverse optical plasmons in layered superconductors
Marel
¹
,
Tsvetkov
²

1996
Czech J Phys
118
18
132
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We discuss the possible existance of transverse optical plasma modes in superlattices consisting of Josephson coupled superconducting layers. These modes appear as resonances in the current-current correlation function, as opposed to the usual plasmons which are poles in the density-density channel. We consider both bilayer superlattices, and single layer lattices with a spread of interlayer Josephson couplings. We show that our model is in quantitative agreement with the recent experimental observation by a number of groups of a peak at the Josephson plasma frequency in the optical conductivity of La$_{1.85}$Sr$_{0.15}$CuO$_4$Comment: Proceedings of LT21, in press, 4 pages, Latex with LTpaper.sty and epsfig.sty, 2 postscript figure

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“…[4]). Previous papers [5,6] considered the "likely" signal from degenerate compact objects in the cusps of normal galaxies, captured by central black holes such as are inferred to be present in the Milky Way [7] and the nearby dwarf elliptical, M32 [8][9][10].…”

Section: Imentioning
confidence: 99%

Estimating the detectable rate of capture of stellar mass black holes by massive central black holes in normal galaxies
Sigurd̵sson
¹

1997
Class. Quantum Grav.
42
1
47
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The capture and subsequent inspiral of stellar mass black holes on eccentric orbits by central massive black holes, is one of the more interesting likely sources of gravitational radiation detectable by LISA. We estimate the rate of observable events and the associated uncertainties. A moderately favourable mass function could provide many detectable bursts each year, and a detection of at least one burst per year is very likely given our current understanding of the populations in cores of normal spiral galaxies. I.The proposed LISA observatory ( [1-3] and this volume) has optimal sensitivity to gravitational radiation in the 10 −3 -10 −2 Hz range. As such it is well matched to the expected frequency of gravitational radiation emitted by compact objects in the last stages of spiral-in to massive black holes with total masses of M BH ∼ 10 6 M ⊙ (see eg. [4]). Previous papers [5,6] considered the "likely" signal from degenerate compact objects in the cusps of normal galaxies, captured by central black holes such as are inferred to be present in the Milky Way [7] and the nearby dwarf elliptical, M32 [8-10].Here we consider the rate for capture of stellar mass black holes expected to be present in the cusps of normal galaxies, and estimate the detectable rate of events by LISA, under both very conservative assumptions and with more optimistic estimates of the black hole population (see also [11,12]).There are several large, systematic uncertainties in estimating the rate of black hole capture. The proportion of galaxies harbouring a central black hole is poorly constrained, although theoretical prejudices suggest central black holes may be ubiquitous [13][14][15]. The mass function of any central black holes is highly uncertain; there are strong observational biases on detection of central black holes, and few galaxies for which there are strong observational constraints as yet [16]. The mass function and total number of stellar mass black holes is also highly uncertain [17]. Stellar mass black holes may form with masses as low as 2 M ⊙ and go up to masses of 50-100 M ⊙ . The range of masses of main sequence stars that form a black hole remnant and the resultant mass of the remnant is also uncertain, and binarity and metallicity may both affect the remnant mass. There are observational biases against detecting the higher mass range of stellar mass black holes as they may sustain higher accretion rates while in binaries, and be detectable in our galaxy for correspondingly shorter time.We assume, conservatively, that masses of central black holes in galaxies are proportional to the mass of the luminous spheroid of the host galaxy [13], with a space density of ∼ 3 × 10 −3 Mpc −3 for the range of black hole masses of interest; and that stellar mass black holes are formed from main sequence stars with zero-age masses greater than 15 M ⊙ , drawn from a Salpeter mass function extending to 30 M ⊙ , with a total number fraction of ∼ 10 −4 black holes per formed star. It is possible, if not likely, that this underestimates su...

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Influence of membrane properties on fouling in MBRs

Cited by 29 publications

References 39 publications

GRB redshift distribution is consistent with GRB origin in evolved galactic nuclei

GRB redshift distribution is consistent with GRB origin in evolved galactic nuclei

Transverse optical plasmons in layered superconductors

Estimating the detectable rate of capture of stellar mass black holes by massive central black holes in normal galaxies

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