{ Gravity models are a class of log-linear regressions that have been used in studies of traac ows between geographical zones. Stochastic parameter variations on these models, and their Bayesian analyses via stochastic simulation, are explored here in connection with the development of approaches to studying variability questions in established traac ow network equilibrium models. In addition t...

By means of He's homotopy perturbation method (HPM) an approximate solution of velocity eld is derived for the ow in straight pipes of non-Newtonian uid obeying the Sisko model. The nonlinear equations governing the ow in pipe are for- mulated and analyzed, using homotopy perturbation method due to He. Furthermore, the obtained solutions for velocity eld is graphically sketched...

It is known that a stochastic differential equation (SDE) induces two probabilistic objects, namely a difusion process and a stochastic flow. While the diffusion process is determined by the innitesimal mean and variance given by the coefficients of the SDE, this is not the case for the stochastic flow induced by the SDE. In order to characterize the stochastic flow uniquely the innitesimal cov...

In the title hydrated mol-ecular salt, 2C5H8N3O(+)·SO4 (2-)·H2O, the components are linked by N-H⋯Os and Ow-H⋯Os (s = sulphate, w = water) hydrogen bonds, generating a layer by a+b+c and 2a-b translations. The cations are arranged nearly in parallel and show displaced π-π stacking centroid-centroid distance = 4.661 (2) Å between adjacent layers.

Objectives: To associate the maternal perception of child’s weight (MPCW) and nutritional status. describe lifestyle behavior problems (CLBPs) self-efficacy (SE) to deal with them, as well verify differences according children without overweight-obesity (OW-OB) MPCW. Material methods: There was participation 274 dyads (mother-preschool child). MPCW assessed through words images. The mothers ans...

We consider a ow control mechanism that dynamically regulates the rate of data ow into a network based on feedback information about the network state. Such mechanisms have been introduced recently in a variety of networks including the Internet, and have been advocated for future high-speed networks. We rst model the ow control mechanism by a discrete-space stochastic process and deene appropr...

We consider a random surface in R d tesselating the space into cells and a random vector eld u which is smooth on each cell but may jump on. Assuming the pair ((; u) stationary we prove an inversion formula expressing the probability of an event under the stationary probability in terms of the Palm probability P deened by the random surface measure associated with. This result involves the ow o...

In this paper, a two timescale simultaneous perturbation stochastic approximation (SPSA) algorithm is developed and applied to closed loop rate based available bit rate (ABR) ow control. The relevant convergence results are stated and explained. Numerical experiments demonstrate fast convergence even in the presence of signiicant delays and a large number of parameterized policy levels.

ADV # 20 AN 05 E CES IN ECOLOGICAL RESEARCH VOL. 37 0065-250 lsevier Ltd. All rights reserved DOI: 10.1016/S0065-2504( 4/0 04) II. I ntroduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222 III. P redator and Prey in the Chemostat—A Simple Story? . . . . . . . . . . . . 224 IV. T esting Hypotheses of Mechanism . . . . . . . . . . . . . . . . . . ...