Results 31 to 40 of about 1,820 (180)
سلامت و محیط, 2020 Background and Objective: Global market growth of reverse osmosis (RO) has led to an increase in annual disposal of membrane wastes. Therefore, evaluation of membrane waste management strategies is important to reduce their adverse environmental impacts.
Seyedeh Elahe Mahdavian +1 more
doaj
J. Symb. Log., 1993 A variety of classes of naturally arising ultrafilters on omega is discussed, and the question is raised whether it is consistent that the classes are empty. Since all the classes contain the P-point ultrafilters, a negative answer would greatly extend the famous theorem of Shelah.
openaire +3 more sources
Membranes, 2023 Membrane filtration is an effective technique for separating micro- and nano-sized oil droplets from harmful oil-contaminated waters produced by numerous industrial activities.
Laura Fekete +9 more
doaj +1 more source
Weak, Strong and Mixed Extensions of Relations to Spaces of Ultrafilters
Mathematical Logic Quarterly, Volume 72, Issue 3, August 2026.ABSTRACT The use of nonstandard methods to characterize properties of weak, strong and mixed extensions of congruences to ultrafilters has been the main topic of several recent papers, focused mostly on congruences and divisions. We show that similar methods can be used to extend these characterizations to arbitrary relations and their interplay.
Leonardo Raffaello Maximilian Gasparro +1 more
wiley +1 more source
On ultrafilters in ZF models and indecomposable ultrafilters
Archive for Mathematical LogicAbstract We use indecomposable ultrafilters to answer some questions from Hayut and Karagila (in Comments Math Univ Carolin 60(2):285–298, 2019). It is shown that the bound on the strength of Usuba (in A note on uniform ultrafilters in choiceless context, arXiv:2401.04871v1 )
Eilon Bilinsky, Moti Gitik
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Ultrafilter Extensions for Coalgebras [PDF]
, 2005 This paper studies finitary modal logics as specification languages for Set-coalgebras (coalgebras on the category of sets) using Stone duality. It is well-known that Set-coalgebras are not semantically adequate for finitary modal logics in the sense that bisimilarity does not in general coincide with logical equivalence.
Clemens Kupke +2 more
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TO A QUESTION ON THE SUPERCOMPACTNESS OF ULTRAFILTER SPACES
Ural Mathematical Journal, 2019 The space of ultrafilters of a \(\pi\)-system endowed with the topology of Wallman type is considered. The question on the supercompactness of this space is investigated.
Alexander G. Chentsov
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The FEBS Journal, Volume 293, Issue 15, Page 4680-4703, August 2026.Investigated mutations in transthyretin (TTR) disrupt the F87‐centered hydrophobic core that stabilizes its tetrameric structure. The mild I107V mutation weakens inter‐chain packing, while H88R fully abolishes tetramer formation, yielding a monomeric, aggregation‐prone form. Structural, biophysical, and computational analyses reveal that both mutations
István L. Bódy +7 more
wiley +1 more source
Ultrafilters in reverse mathematics [PDF]
Journal of Mathematical Logic, 2014 We extend theories of reverse mathematics by a non-principal ultrafilter, and show that these are conservative extensions of the usual theories ACA0, ATR0, and [Formula: see text].
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Oxidation of Manganese(II) With Ferrate Revisited: The Overlooked Role of Hardness Cations
AWWA Water Science, Volume 8, Issue 4, July/August 2026.ABSTRACT Manganese (Mn) is a concern for some groundwater‐sourced drinking water systems. Ferrate (Fe(VI)) is a promising alternative oxidant for Mn treatment, but particle formation during Mn(II) oxidation is not well understood under realistic groundwater conditions with high hardness (> 180 mg/L) and low natural organic matter (< 1 mg/L NOM).
Jacira Rosa Soares +3 more
wiley +1 more source