Results 31 to 40 of about 4,395,518 (296)

Random Field and Random Anisotropy Effects in Defect-Free Three-Dimensional XY Models

open access: yes, 2000
Monte Carlo simulations have been used to study a vortex-free XY ferromagnet with a random field or a random anisotropy on simple cubic lattices. In the random field case, which can be related to a charge-density wave pinned by random point defects, it ...
A. Aharony   +37 more
core   +1 more source

Multilevel Intersectional Analysis to Identify Extreme Profiles in Italian Student Achievement Data

open access: yesSocial Sciences
Students have diverse identities and social characteristics. The different combinations of these factors create a stratification that affects the learning outcomes.
Enrico Contin, Leonardo Grilli
doaj   +1 more source

Comparative Electrical Energy Yield Performance of Micro-Inverter PV Systems Using a Machine Learning Approach Based on a Mixed-Effect Model of Real Datasets

open access: yesIEEE Access, 2019
Long-term energy evaluation of PV systems that use micro-inverter configuration (micro-inverter PV systems) is currently unclear due to the lacking of sufficient longitudinal measurement data and appropriate analysis method.
Ngoc Thien Le, Watit Benjapolakul
doaj   +1 more source

In-Orbit Reliability Evaluation of Space TWTA Based on Copula Function and Bivariate Hybrid Stochastic Processes

open access: yesApplied Sciences, 2022
Currently, it is still a challenge to study the degradation mechanisms of the space traveling wave tube amplifier (TWTA) with no failure and small sample tests.
Xiao-Ning Wang   +5 more
doaj   +1 more source

The Fay–Herriot Model in Small Area Estimation

open access: yesRevstat Statistical Journal, 2020
Standard methods of variance component estimation used in the Fay-Herriot model for small areas can produce problems of inadmissible values (negative or zero) for these variances. This implies that the empirical best linear unbiased predictor of a small
José Luis Ávila-Valdez   +4 more
doaj   +1 more source

Inference and Local Influence Assessment in a Multifactor Skew-Normal Linear Mixed Model

open access: yesMathematics, 2022
This work considers a multifactor linear mixed model under heteroscedasticity in random-effect factors and the skew-normal errors for modeling the correlated datasets.
Zeinolabedin Najafi   +4 more
doaj   +1 more source

Estimating the Demand for Health Care with Panel Data: A Semiparametric Bayesian Approach [PDF]

open access: yes, 2003
This paper is concerned with the problem of estimating the demand for health care with panel data. A random effects model is specifed in a semiparametric Bayesian fashion using a Dirichlet process prior. This results in a very exible mixture distribution
Jochmann, M., Leon-Gonzalez, R.
core   +2 more sources

Cognitive Functioning in Vorinostat‐Treated Pediatric and Young Adult Patients Over the First 180 Days After Hematopoietic Stem Cell Transplant

open access: yesPediatric Blood &Cancer, EarlyView.
ABSTRACT Purpose Cognitive and psychological difficulties could negatively interfere with treatment adherence and quality of life before and after hematopoietic stem cell transplant (HSCT). Methods to mitigate these changes may have positive effects on treatment success.
Kristen L. Votruba   +11 more
wiley   +1 more source

Prediction of Individual Tree Diameter Using a Nonlinear Mixed-Effects Modeling Approach and Airborne LiDAR Data

open access: yesRemote Sensing, 2020
Rapidly advancing airborne laser scanning technology has become greatly useful to estimate tree- and stand-level variables at a large scale using high spatial resolution data.
Liyong Fu   +8 more
doaj   +1 more source

Effects of random RF disturbances on aeronautical communication systems [PDF]

open access: yes, 2015
Air Traffic Control (ATC) and their responsible authorities have been always very sensitive to safety of the systems they are using to guarantee a fool-proof and environmentally safe operation of the facilities to provide air traffic services and ...
De Vos, Jan   +3 more
core   +1 more source

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