Results 261 to 270 of about 190,348 (307)

An Initialization Program for Separably Stiff Systems

SIAM Journal on Scientific and Statistical Computing, 1983
Initialization of a separably stiff system of ordinary differential equations consists of readjusting certain initial values, while holding the others fixed, in such a way that the solution of the system does not have an initial transient. This paper discusses the features of a FORTRAN program which solves the initialization problem. The algorithm used
openaire   +2 more sources

Efficient Initialization of Stiff Systems with One Unknown Initial Condition

SIAM Journal on Numerical Analysis, 1981
Consider a stiff system of ordinary differential equations for which one of the initial values is unknown. We develop an efficient procedure to determine the unknown initial value in such a way that the solution of the system does not have an initial transient.
openaire   +1 more source

Inexact Methods in the Numerical Solution of Stiff Initial Value Problems

Computing, 1999
The paper deals with the analysis of the local convergence properties of the inexact Newton methods (IN-methods) which can be effectively used for solving large stiff initial value problems for nonlinear ordinary differential equations. New conditions assuring linear convergence of IN-methods in terms of a sequence of forcing terms uniformly less than ...
MORINI, BENEDETTA, MACCONI, MARIA
openaire   +2 more sources

A modified Adams method for nonstiff and mildly stiff initial value problems

ACM Transactions on Mathematical Software, 1993
Adams predictor-corrector methods, and explicit Runge–Kutta formulas, have been widely used for the numerical solution of nonstiff initial value problems. Both of these classes of methods have certain drawbacks, however, and it has long been the aim of numerical analysts to derive a class of formulas that has the advantages of both Adams and Runge ...
Jeff R. Cash, S. Semnani
openaire   +1 more source

Numerical Studies of Fracture Initiation and Propagation in Stiff Soil

Underground Construction and Ground Movement, 2006
A geo-material failure process analysis, considering the coupling of stress distribution, fluid flow, and element damage evolution, has been used to investigate the mechanisms of crack initiation and propagation around a 2-D cylindrical cavity in heterogeneous stiff soils during grouting.
Yang, XQ, Zhang, HQ, Fangzhen, Wang, SY, Yeung, AT, Au, SK   +5 more
openaire   +2 more sources

A class of exponential methods for stiff initial-value problems

International Journal of Computer Mathematics, 1996
In this paper, we derive a class of exponential methods for solving the stiff initial-value problems. The present methods are unconditionally stable and satisfy a discrete maximum principle. These include an even order of accuracy when the perturbation parameter, e, is fixed and have the property that if e is of order h they reduce to first order ...
openaire   +1 more source

Factors Affecting the Initial Stiffness of Cohesive Soils

Journal of Geotechnical and Geoenvironmental Engineering, 2005
The paper presents the results of an extensive laboratory program conducted to establish the factors affecting the initial stiffness (Young’s modulus) of cohesive soils in undrained triaxial compression. The testing program, conducted on resedimented Boston blue clay (RBBC) comprised more than 100 phases of undrained shear and isolated the role of ...
Marika Santagata, John T. Germaine, Charles C. Ladd   +2 more
openaire   +1 more source

Effects of geologic time on the initial stiffness of clays

Engineering Geology, 2007
Abstract The paper addresses the effect of geologic aging on the initial stiffness of clays through the analysis of in situ shear stiffness data obtained using a seismic cone penetrometer at three sites in Boston blue clay (BBC), a 12,000–14,000-year old post-glacial marine clay deposit.
Marika Santagata, Yeoun Ike Kang
openaire   +1 more source

A noninvasive measurement technique for the initial stiffness of the radial artery

Journal of the Mechanical Behavior of Biomedical Materials
Arterial stiffness carries significant implications for cardiovascular disease. Monitoring changes in arterial stiffness is integral to proactive health management, however, current noninvasive methods of quantifying stiffness in vivo rely primarily on linear tangent stiffness, making the measurements vulnerable to the variability of blood pressure and
Yixing, Zhang, Xue, Feng, Mingxing, Shi, Yinji, Ma   +3 more
openaire   +2 more sources

The effects of surface and initial stresses on the bending stiffness of nanowires

Nanotechnology, 2008
A simple closed-form analytic solution has been obtained for the effect of initial residual stress on the bending stiffness and hence the natural frequency of a coaxial core-shell nanowire. The result obtained also applies for a pre-stressed macro core-shell structure or a simple nanowire. The relative effect of the initial residual stress is generally
openaire   +2 more sources