Results 51 to 60 of about 365,910 (236)

Singularity Processing Method of Microstrip Line Edge Based on LOD-FDTD

open access: yesInternational Journal of Antennas and Propagation, 2014
In order to improve the performance of the accuracy and efficiency for analyzing the microstrip structure, a singularity processing method is proposed theoretically and experimentally based on the fundamental locally one-dimensional finite difference ...
Lei Li, Xin Zhang, Yingsong Li
doaj   +1 more source

The Langevin Approach: a simple stochastic method for complex phenomena

open access: yes, 2015
We describe a simple stochastic method, so-called Langevin approach, which enables one to extract evolution equations of stochastic variables from a set of measurements.
Fuchs, André   +5 more
core   +1 more source

How to quantify deterministic and random influences on the statistics of the foreign exchange market [PDF]

open access: yes, 1999
It is shown that prize changes of the US dollar - German Mark exchange rates upon different delay times can be regarded as a stochastic Marcovian process. Furthermore we show that from the empirical data the Kramers-Moyal coefficients can be estimated.
A. Arneodo   +19 more
core   +2 more sources

Media Genealogy: Technological and Historical Engagements of Power — Introduction

open access: yesInternational Journal of Communication, 2016
This introductory article offers theoretical and methodological demarcations for media genealogy, which operates in the work of each scholar interviewed for this special issue.
Alexander Monea, Jeremy Packer
doaj   +2 more sources

Otto Stern (1888-1969): The founding father of experimental atomic physics

open access: yes, 2011
We review the work and life of Otto Stern who developed the molecular beam technique and with its aid laid the foundations of experimental atomic physics.
Friedrich, Bretislav   +3 more
core   +1 more source

A Compact Unconditionally Stable Method for Time-Domain Maxwell's Equations

open access: yesInternational Journal of Antennas and Propagation, 2013
Higher order unconditionally stable methods are effective ways for simulating field behaviors of electromagnetic problems since they are free of Courant-Friedrich-Levy conditions. The development of accurate schemes with less computational expenditure is
Zhuo Su, Yongqin Yang, Yunliang Long
doaj   +1 more source

Global Affinities: The Natural Method and Anomalous Plants in the Nineteenth Century

open access: yesHoST, 2021
Approaching from an analysis of the work of Robert Brown (1773-1858) and Friedrich Welwitsch (1806–1872) on Rafflesia and Welwitschia, this article explores how the “natural method” became a tool for understanding extra-European flora in the nineteenth ...
Kury Lorelai, Albuquerque Sara
doaj   +1 more source

Geometric and projection effects in Kramers-Moyal analysis

open access: yes, 2009
Kramers-Moyal coefficients provide a simple and easily visualized method with which to analyze stochastic time series, particularly nonlinear ones. One mechanism that can affect the estimation of the coefficients is geometric projection effects. For some
H. Kantz   +3 more
core   +1 more source

Killing spinors in supergravity with 4-fluxes

open access: yes, 2003
We study the spinorial Killing equation of supergravity involving a torsion 3-form $\T$ as well as a flux 4-form $\F$. In dimension seven, we construct explicit families of compact solutions out of 3-Sasakian geometries, nearly parallel $\G_2$-geometries
Agricola I Friedrich Th   +14 more
core   +3 more sources

A Method for Calculating the Structure of (Singular) Spacetimes in the Large

open access: yes, 1994
A formalism and its numerical implementation is presented which allows to calculate quantities determining the spacetime structure in the large directly.
C. J. S. Clarke   +26 more
core   +1 more source

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