Results 21 to 30 of about 3,152,770 (169)

Natural convection of Al2O3-water nanofluid with variable properties in a square enclosure with heat source and heat sink on the vertical walls [PDF]

مجله مدل سازی در مهندسی, 2017
The buoyancy-driven fluid flow and heat transfer in a square cavity with partially active side walls filled The buoyancy-driven fluid flow and heat transfer in a square cavity with partially active side walls filled which the length is equal to half of ...
G.A. Sheikhzadeh, M. Rezaee, M. Ahmadi, mohammadreza babaei   +3 more
doaj   +1 more source

Neutrosophic Ranked Set Sampling Scheme for Estimating Population Mean: An Application to Demographic Data [PDF]

Neutrosophic Sets and Systems
The primary goal of this study is to address the limitations of classical statistics in handling ambiguous or indeterminate data. The best alternative to classical and fuzzy statistics for handling such data uncertainty is neutrosophic statistics, which ...
Rajesh Singh , Anamika Kumari
doaj   +1 more source

Occupational stress and burnout among intensive care unit nurses during the pandemic: A prospective longitudinal study of nurses in COVID and non-COVID units

Frontiers in Psychiatry, 2023
BackgroundIntensive care unit (ICU) nurses are highly prone to occupational stress and burnout, affecting their physical and mental health. The occurrence of the pandemic and related events increased nurses’ workload and further exacerbated their stress ...
Pratima Saravanan, Tariq Nisar, Qian Zhang, Faisal Masud, Farzan Sasangohar, Farzan Sasangohar   +5 more
doaj   +1 more source

Time variability studies with ROSAT [PDF]

International Astronomical Union Colloquium, 1995
AbstractAn overview over the mission of the X-ray astronomy satellite ROSAT (Röntgensatellit) is given with an emphasis on the first soft X-ray all-sky survey carried out with an imaging telescope. Several examples of time variability studies made possible by the all-sky survey are shown for active late-type stars. Two exceptional long-duration stellar
openaire   +1 more source

Optimal Neutrosophic Difference to Log-Type Estimator for Population Mean: Some Numerical and Simulation Studieshttps://fs.unm.edu/NSS/11NeutrosophicDifference.pdf [PDF]

Neutrosophic Sets and Systems
Indeterminacy in the data are commonly observed in various fields like biomedicine, finance, marketing and other sphere of sciences, where classical statistical methods is a challenging task to deal such type of data.
SM Afsar Basha, Mahamood Usman
doaj   +1 more source

Variable Stiffness Composites: Optimal Design Studies [PDF]

Journal of Composites Science, 2020
This research work has two main objectives, being the first related to the characterization of variable stiffness composite plates’ behavior by carrying out a comprehensive set of analyses. The second objective aims at obtaining the optimal fiber paths, hence the characteristic angles associated to its definition, that yield maximum fundamental ...
Marques, Filipe Eduardo Correia, Mota, A. F., Loja, M.A.R.   +2 more
openaire   +2 more sources

Photometric studies of be star variability [PDF]

Experimental Astronomy, 1994
Be stars are hot stars which have shown emission in at least one Balmer line on at least one occasion. As the definition implies, the Be phenomenon can be variable with time: on time scales of days to decades as the circumstellar disc develops and disperses; on time scales of days to months in a few Be stars which are interacting binaries; on time ...
openaire   +1 more source

Variability study for saltstone [PDF]

, 2005
This report is a summary of the bench-scale experimental studies performed by the Savannah River National Laboratory (SRNL) for Waste Solidification Engineering (WSE) to establish the viability of a grout-based variability study. In order for a variability study to be useful, the property measurements of the fresh and cured Saltstone must be ...
J. R. Harbour, T. B. Edwards, E. K. Hansen, V. J. Williams   +3 more
openaire   +1 more source

A family of estimators for variance estimation

Research in Statistics
The potential of this study for estimating the finite population variance of the study variable of a class of estimators by utilizing an auxiliary variable in simple random sampling is enormous.
Housila P. Singh, Sanam Preet Kour, Sunil Kumar, Rakesh Chib   +3 more
doaj   +1 more source

Dual Transformation of Auxiliary Variables by Using Outliers in Stratified Random Sampling

Mathematics
To estimate the finite population variance of the study variable, this paper proposes an improved class of efficient estimators using different transformations. When both the minimum and maximum values of the auxiliary variable are known and the ranks of
Mohammed Ahmed Alomair, Umer Daraz
doaj   +1 more source