Congrès International d'Architecture Moderne

About: Congrès International d'Architecture Moderne is a based out in . It is known for research contribution in the topics: Boundary value problem & Jet (fluid). The organization has 393 authors who have published 403 publications receiving 4104 citations.

Stochastic differential equation model to Prendiville processes

Abstract: The Prendiville process is another variation of the logistic model which assumes linearly decreasing population growth rate. It is a continuous time Markov chain (CTMC) taking integer values in the finite interval. The continuous time Markov chain can be approximated by stochastic differential equation (SDE). This paper discusses the stochastic differential equation of Prendiville process. The work started with the forward Kolmogorov equation in continuous time Markov chain of Prendiville process. Then it was formulated in the form of a central-difference approximation. The approximation was then used in Fokker-Planck equation in relation to the stochastic differential equation of the Prendiville process. The explicit solution of the Prendiville process was obtained from the stochastic differential equation. Therefore, the mean and variance function of the Prendiville process could be easily found from the explicit solution.

Estimating completeness of foodborne disease registration in North West Morocco

Abstract: This study aims to estimate the total number of poisoning cases and completeness of foodborne disease surveillance in the region of Tanger-Tetouan-Al Hoceima in North West Morocco. This retrospective study was conducted to assess the completeness of food poisoning surveillance system in the Tanger-Tetouan-Al Hoceima region over a three-year period from January 1, 2014 to December 31, 2016. The data used for this study were obtained from two sources, including the national poisoning database of the Moroccan Poison Control Center (MPCC) and provincial hospital registries in the study area. The completeness of foodborne disease reporting was estimated using the capture-recapture method. During the study period, 235 cases of foodborne diseases were reported to the Moroccan Poison Control Center, 725 cases were notified to the provincial hospital registries and 98 cases were common to both sources. The estimated total number of poisoning cases was 1,739 (95% CI: 1,494-1,983). The completeness of foodborne disease surveillance for the national database of poisoning and hospital registries was estimated to be 13.5% and 41.7%, respectively. Improvement of the completeness of poisoning surveillance system is needed to estimate the true incidence of poisoning in Morocco.

Numerical modeling of separated flows in three-dimensional diffusers and application of synthetic jets for separation control

Abstract: Solving the problem of creating an environmentally friendly “green plane” implies development and implementation of several actions aimed at increasing airplane performance and reducing environmental contamination. One possible way to solve this problem is to reduce the powerplant weight, in particular, by decreasing its length. The airplane engine flowpath comprises transition ducts: those between the low- and high-pressure compressors, between the compressor and combustor, and between the high- and low-pressure turbines. In a modern high-bypass turbofan, the flowpath varies in the streamwise direction. Shorter transition ducts have greater curvature. Because of this, intensive separation may occur, which leads to increased losses in the flowpath and to significant growth of nonuniformity of flow parameters. Vast experience of numerical and experimental studies of unsteady separated flows has been accumulated by now. In many cases, however, these investigations are performed in a two-dimensional (2D) formulation, which is primarily caused by the high cost of three-dimensional (3D) unsteady calculations. The numerical and experimental work [1] shows that flows in diffuser ducts can have an essentially unsteady 3D structure. This is valid even for ducts modeling 2D configurations. This paper describes the results of a numerical study of the flow structure and its features in model S-shaped transition ducts, as well as the results of using a synthetic jet generator for flow control and for reduction of total pressure losses. Three-dimensional flows are numerically modeled by the unsteady Reynolds-averaged Navier-Stokes (URANS) / RANS methods. The calculations show that the use of the synthetic jet generator can lead to duct loss reduction by 45%.

Efecto de la frecuencia de corte para ensilar y del nivel de suplementación en el comportamiento de terneros

Abstract: espanolSe utilizo una pradera de raigras ingles, dactilo y trebol blanco para estudiar el efecto que sobre el comportamiento de terneros tiene cosechar, para ensilado, mediante 2 o 3 cortes. El ensilado de cada hectarea, segun procediese de dos o tres cortes, se suministro a lotes de ocho terneros, con 2 o 3 kg de cebada en un diseno factorial 2 x2 durante dos anos. Con el sistema de tres cortes, la digestibilidad del ensilado mejoro 2,2 puntos, la ingestion un 12,5 p. 100 y las ganancias diarias de peso vivo un 24,7 p.100. Sin embargo, la menor produccion de hierba y la mayor ingestion de ensilado asociado al sistema de tres cortes, redujo la produccion de peso vivo por hectarea en un 14 p.100, al mismo tiempo que el concentrado necesario para producir un kilogramo de peso vivo disminuyo en un 19,65 p. 100. Palabras clave: Ensilado, frecuencia de corte, suplementacion, crecimiento de terneros EnglishA sward of perennial ryegrass, cocksfoot and white clover was harvested for silage under a system of two or three cuts, and given "ad libitum" to young friesian bulls. Each type of silage was offered to a group of eight young bulls and supplemented with two or three kilograms of barley, in a 2x2 factorial design. Digestibility of the three cut silage was 2.2 points greater than the one of two cuts. Dry matter intake and liveweight gain increased by 12.5 p.100 and 24.7 p.100, respectively with three cuts as compared with two cuts. As a consecuence of the lower herbage yield per hectare, with the three cuts system, the live-weight gain per hectare resulted in a reduction of 14 p.100, but the need for concentrate to give a kilogram of liveweight decreased by 19.9 p.100.