Results 71 to 80 of about 4,157,742 (220)
Results in EngineeringFick's second law is a partial differential equation that describes the time-dependent concentration distribution of a diffusing species. It is fundamental to fields like environmental and materials engineering.
Michael Brilz +3 more
doaj +1 more source
The Accuracy Smoothness Dilemma in Prediction: A Novel Multivariate M‐SSA Forecast Approach
Journal of Time Series Analysis, EarlyView.ABSTRACT Forecasting presents a complex estimation challenge, as it involves balancing multiple, often conflicting, priorities and objectives. Conventional forecast optimization methods typically emphasize a single metric, such as minimizing the mean squared error (MSE), which may neglect other crucial aspects of predictive performance. To address this
Marc Wildi
wiley +1 more source
Parametric Time‐Variation in the Unconditional Volatility: Estimation and Inference
Journal of Time Series Analysis, EarlyView.ABSTRACT We propose modeling time‐variation in the unconditional volatility by augmenting the standard GARCH model by a deterministic time‐varying intercept. The model, called the additive time‐varying (ATV‐)GARCH model, can be interpreted as a reduced form of a model including covariates and can be derived from a multiplicative decomposition of ...
Niklas Ahlgren +2 more
wiley +1 more source
A trigonometric series used in physical problems
, 1953 In connexion with a boundary-value problem in room acoustics, we were led to consider the following trigonometric series. It has been noted further that certain other trigonometric series encountered by K. S. Krishnan and L. S.
Lakshmana Rao, S. K., Ramakrishna, B. S.
core +1 more source
Local Trigonometric Methods for Time Series Smoothing. [PDF]
, 2014 The thesis is concerned with local trigonometric regression methods. The aim was to develop a method for extraction of cyclical components in time series. The main results of the thesis are the following.
Gentile, Maria <1981>
core +1 more source
Deret Maclaurin Turunan Fraksional Fungsi Inverse Trigonometri dan Radius Kekonverganannya
Jambura Journal of MathematicsFractional derivatives are a generalization of ordinary derivatives to non-integer or fractional orders. This study presents the fractional derivatives of inverse trigonometric functions (arcsin, arccos, and arctan) with the order constraint 0 α ≤ 1 ...
Siti Miftahurrohmah Khoirunisa +2 more
doaj +1 more source
Universal series by trigonometric system in weighted Lμ1 spaces
International Journal of Mathematics and Mathematical Sciences, 2006 We consider the question of existence of trigonometric series universal in weighted Lμ1[0, 2π] spaces with respect to rearrangements and in usual sense.
S. A. Episkoposian
doaj +1 more source
Active Learning in Precalculus: The Impact of Redesigning a Large Enrollment Course
School Science and Mathematics, EarlyView.ABSTRACT This paper describes an active learning instructional approach that was designed based on the principles outlined in the 2018 Mathematical Association of America Instructional Practices Guide and was implemented in a large enrollment Precalculus course at a large urban institution with a high percentage of students from underrepresented ...
Aimee J. Ellington
wiley +1 more source
Initial-boundary value problems in a plane corner for the heat equation
Electronic Journal of Differential Equations, 2010 We study the Dirichlet initial problem for the heat equation by the Fourier-Bessel method in a plane corner. We prove classical solvability for the problem in weighted Holder spaces.
Borys V. Bazaliy, Nataliya Vasylyeva
doaj
Journal of Geophysical Research: Machine Learning and Computation, Volume 3, Issue 5, October 2026.Abstract Vertical correction of precipitable water vapor (PWV) is a critical step in PWV fusion and atmospheric research. To address the limited accuracy of traditional global‐scale PWV vertical correction models that do not explicitly account for nonlinear vertical variations, we developed RF‐PWV, a global 1° × 1° PWV vertical correction model based ...
Junyu Li +6 more
wiley +1 more source