Results 71 to 80 of about 1,268 (179)

Likelihood Estimation for Stochastic Differential Equations with Mixed Effects

Scandinavian Journal of Statistics, EarlyView.
ABSTRACT Stochastic differential equations provide a powerful tool for modelling dynamic phenomena affected by random noise. When time series are observed for several experimental units, it is often the case that some of the parameters vary between the individual experimental units.
Fernando Baltazar‐Larios, Mogens Bladt, Michael Sørensen   +2 more
wiley   +1 more source

Closed-Form Pricing of European Call Options Under a Sub-Mixed Fractional Brownian Motion with Jumps via Three Pricing Approaches

Mathematics
The Black–Scholes model laid the mathematical foundation for modern option pricing; however, its assumptions—stationary, independent, and Gaussian returns—are frequently violated in real markets, where long-memory volatility and sudden price jumps are ...
Kai Zhang, Lingfei Chen, Xinmiao Zhou, Yuanxin Li, Pingling Cai, Zhihong Wang   +5 more
doaj   +1 more source

Spaceborne and spaceborn: Physiological aspects of pregnancy and birth during interplanetary flight

Experimental Physiology, EarlyView.
Abstract Crewed interplanetary return missions that are on the planning horizon will take years, more than enough time for initiation and completion of a pregnancy. Pregnancy is viewed as a sequence of processes – fertilization, blastocyst formation, implantation, gastrulation, placentation, organogenesis, gross morphogenesis, birth and neonatal ...
Arun V. Holden
wiley   +1 more source

Mass Spectrometry in Chiral Analysis and Synthesis

Chirality, Volume 38, Issue 8, August 2026.
Chiral molecules have the same mass, yet there are MS approaches that can distinguish chiral molecules. MS‐based chiral chemistry matters in fundamental physical experiments, industrial applications, and clinical analysis. ABSTRACT Mass spectrometry (MS) has a role to play in chiral chemistry, in part through methods based on microdroplets and non ...
Brison A. Shira, Mahdiyeh Shahi, R. Graham Cooks   +2 more
wiley   +1 more source

Multifractal earth topography [PDF]

Nonlinear Processes in Geophysics, 2006
This paper shows how modern ideas of scaling can be used to model topography with various morphologies and also to accurately characterize topography over wide ranges of scales. Our argument is divided in two parts.
J.-S. Gagnon, S. Lovejoy, S. Lovejoy, D. Schertzer   +3 more
doaj  

MHD Heat Transfer Enhancement in TiO2‐Fe3O4/Water Hybrid Nanofluid Over a Porous Stretching/Shrinking Surface With Suction/Injection and Heat Source Effects

Engineering Reports, Volume 8, Issue 8, August 2026.
Magnetohydrodynamic flow of TiO2‐Fe3O4/water hybrid nanofluid over a porous stretching/shrinking surface enhances heat transfer under Joule heating and radiation effects. Thermal performance improves with nanoparticle concentration and Eckert number, while suction reduces heat transport, highlighting its potential for advanced industrial cooling ...
K. Govardhan, S. Renuka, V. Meenakshi, G. Narender   +3 more
wiley   +1 more source

Weighted Sub-fractional Brownian Motion Process: Properties and Generalizations

In this paper, we present several path properties, simulations, inferences, and generalizations of the weighted sub-fractional Brownian motion. A primary focus is on the derivation of the covariance function $R_{f,b}(s,t)$ for the weighted sub-fractional Brownian motion, defined as: \begin{equation*} R_{f,b}(s,t) = \frac{1}{1-b} \int_{0}^{s \wedge t} f(
Hermenegildo, Ramirez-Gonzalez Jose, Ying, Sun   +1 more
openaire   +2 more sources

Computational Investigation of MHD Radiative Flow of Shape‐Dependent Al2O3$$ A{l}_2{O}_3 $$ and Fe3O4$$ F{e}_3{O}_4 $$ Nanofluids in A Semi‐Porous Channel

Engineering Reports, Volume 8, Issue 8, August 2026.
A computational study of unsteady MHD radiative nanofluid flow in a semi‐porous channel reveals that nanoparticle shape, volume fraction, and magnetic effects significantly influence velocity and heat transfer. Results highlight strong coupling between geometric, electromagnetic, and thermophysical parameters in optimizing thermal system performance ...
Mahmmoud M. Syam, Sondos M. Syam, Muhammed I. Syam   +2 more
wiley   +1 more source

Progress in Biodegradable Nonwoven Materials for Personal Protective Applications

Macromolecular Materials and Engineering, Volume 311, Issue 8, August 2026.
ABSTRACT Personal protective equipment generates large waste streams, underscoring the need for materials that deliver protection without persistent environmental costs. This study reviews biodegradable nonwoven options and relates material choice and disposal routes to barrier performance, comfort, and footprint.
Tarikul Islam, Sayam, Pooja Maurya, Gajanan Bhat   +3 more
wiley   +1 more source

Asymptotic Analysis of a Kernel-Type Estimator for Parabolic Stochastic Partial Differential Equations Driven by Cylindrical Sub-Fractional Brownian Motion

Mathematics
The main purpose of the present paper is to investigate the problem of estimating the time-varying coefficient in a stochastic parabolic equation driven by a sub-fractional Brownian motion.
Abdelmalik Keddi, Salim Bouzebda, Fethi Madani   +2 more
doaj   +1 more source