Results 21 to 30 of about 18,673 (207)

The Crete Isl. (Greece) Mw6.0 Earthquake of 27 September 2021: Expecting the Unexpected

open access: yesGeoHazards, 2022
The 27 September 2021 damaging mainshock (Mw6.0) is the first known strong earthquake that ruptured the Arkalochori area, Crete Isl., Greece, during the entire historical period, making it an unexpected event in the long-term sense.
Ioanna Triantafyllou   +4 more
doaj   +1 more source

Variational assimilation of IASI SO2 plume height and total column retrievals in the 2010 eruption of Eyjafjallajökull using the SILAM v5.3 chemistry transport model [PDF]

open access: yesGeoscientific Model Development, 2017
This study focuses on two new aspects of inverse modelling of volcanic emissions. First, we derive an observation operator for satellite retrievals of plume height, and second, we solve the inverse problem using an algorithm based on the 4D-Var data ...
J. Vira   +3 more
doaj   +1 more source

On the first and second moments of the truncated multi-normal distribution and a simple estimator [PDF]

open access: yesEconomics Letters, 1979
Abstract The relations between the first two moments of multivariate normal random variables with some components truncated are found. Simple instrumental variable estimators are available. The analysis extends results of Amemiya, and Sickles and Schmidt.
openaire   +1 more source

A note on the characterizations of the distributions of the condition numbers of real Gaussian matrices

open access: yesSpecial Matrices, 2018
Many researchers and authors have studied the distributions of the condition numbers of real Gaussian matrices, which appear in many fields of pure and applied sciences, such as, probability, statistics, multivariate statistics, linear algebra, operator ...
Shakil M., Ahsanullah M.
doaj   +1 more source

On a Generalized Burr Life-Testing Model: Characterization, Reliability, Simulation, and Akaike Information Criterion

open access: yesJournal of Statistical Theory and Applications (JSTA), 2019
For a continuous random variable X, M. Shakil, B.M.G. Kibria, J. Stat. Theory Appl. 9 (2010), 255–282, introduced a generalized Burr increasing, decreasing, and upside-down bathtub failure rate life-testing model.
M. Ahsanullah   +3 more
doaj   +1 more source

Some inferences on the distribution of the Demmel condition number of complex Wishart matrices

open access: yesSpecial Matrices, 2017
In recent years, many researchers have studied the distributions of the Demmel (or the scaled) condition numbers (DCN) of complex Wishart matrices. In this paper, several new distributional properties of the distribution of the Demmel condition number of
Shakil M., Ahsanullah M.
doaj   +1 more source

Integrating faults and past earthquakes into a probabilistic seismic hazard model for peninsular Italy [PDF]

open access: yesNatural Hazards and Earth System Sciences, 2017
Italy is one of the most seismically active countries in Europe. Moderate to strong earthquakes, with magnitudes of up to ∼ 7, have been historically recorded for many active faults.
A. Valentini, F. Visini, B. Pace
doaj   +1 more source

Ultrastructural Sperm Flagellum Defects in a Patient With CCDC39 Compound Heterozygous Mutations and Primary Ciliary Dyskinesia/Situs Viscerum Inversus

open access: yesFrontiers in Genetics, 2020
Introduction: Primary ciliary dyskinesia (PCD) is a rare autosomal recessive disease characterized by structural or functional motile cilia abnormalities. Up to 40 different genes seem, at the moment, to be involved in the pathogenesis of PCD.
Rossella Cannarella   +7 more
doaj   +1 more source

The Nevanlinna matrix of the truncated Hausdorff matrix moment problem via orthogonal matrix polynomials on [a,b] for the case of an even number of moments

open access: yesVisnik Harkivsʹkogo Nacionalʹnogo Universitetu im. V.N. Karazina. Cepiâ Matematika, Prikladna Matematika i Mehanika
The scalar moment problem was first introduced by T. J. Stieltjes in his work ``Recherches sur les fractions continues'' Annals of the Faculty of Sciences of Toulouse 8, 1--122, (1895).
Б. Е. Медіна-Ернандес
doaj   +1 more source

An Improved Extrapolation Scheme for Truncated CT Data Using 2D Fourier-Based Helgason-Ludwig Consistency Conditions

open access: yesInternational Journal of Biomedical Imaging, 2017
We improve data extrapolation for truncated computed tomography (CT) projections by using Helgason-Ludwig (HL) consistency conditions that mathematically describe the overlap of information between projections. First, we theoretically derive a 2D Fourier
Yan Xia   +5 more
doaj   +1 more source

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