DIFFERENT REPRESENTATIONS FOR BILINEAR MODELS

Abstract. In this paper, we investigate different representations of bilinear models introduced by Granger and Andersen (1978). We consider first the decomposition of these models on the chaos of Wiener, then we give for the subdiagonal models a l -Markovian representation, generalizing a result obtained by Pham Dinh (1985) in the case of the superdiagonal models. Thus we consider the polynomial state affine representation. For these representations, we are interested in the existence and the uniqueness of the decomposition and the expression of the different moments of the models.     

CONSEQUENCES OF A CONFORMATIONAL CHANGE OF FLEXIBLE MACROMOLECULES ON THE NON-NEWTONIAN BEHAVIOUR OF THEIR SOLUTIONS

The shearthickening behaviour of flexible macromolecules in dilute solutions in a simple shear flow is predicted under the assumption of a transconformation from a random coil to a deformed coil at a critical shear rate. Some numerical results for polydisperse solutions in a constant shear rate flow, and monodisperse and polydisperse solutions in a Poiseuille flow are presented     

利用IRAS研究锌表面在湿干交替条件下的腐蚀行为

设计了一套原位红外反射吸收电池，可以研究Zn在干湿交替条件下的腐蚀过程和溶液在Zn表面的挥发过程，结果表明溶液在Zn表面的挥发主要有三个阶段，局部Zn表面在1％NaCl溶液中浸泡1h后在湿度为50％的净化空气中干燥23h的周期性湿干交替试验，腐蚀产物主要是ZnO，腐蚀产物的是在初期随着周期（d）的增大而线性增加，在23h的干燥过程中，Zn的腐蚀速率随着干燥时间的增加而降低。     

Chemoenzymatic production of (+)-coriolic acid from trilinolein: Coupled synthesis and extraction

Chemoenzymatic conversion of trilinolein to (+)-coriolic acid was investigated in this work. Lipase-catalyzed hydrolysis of trilinolein and lipoxygenation of liberated linoleic acid were coupled in a two-phase medium that consisted of a pH 9 borate buffer and a water-immiscible organic solvent (octane). High concentrations of trilinolein could be dissolved in the organic phase (up to 340 mM). Linoleic acid, liberated after hydrolysis, transferred to the aqueous phase and was enzymatically converted to the preferred 13(S)-hydroperoxy-9Z,11E-octadecadienoic acid with soybean lipoxygenase-1. This product, which remained in the aqueous phase, could be recovered by centrifugation and then chemically reduced to (+)-coriolic acid (purity >95%). Recovery of this compound by liquid-liquid extraction was easy. The structure of (+)-coriolic acid has been confirmed by ¹H nuclear magnetic resonance spectroscopy, mass spectrometry, and infrared spectroscopy. High yields were obtained with pure trilinolein or sunflower oil as initial substrates.     

Performance simulation of an absorption heat transformer operating with partially miscible mixtures

This paper proposes to study the thermodynamics performances of a new absorption heat-transformer cycle, where the separation step is obtained by the cooling and settling of a partially miscible mixture at low temperature. This new cycle has been called an absorption-demixing heat transformer (ADHT) cycle. A numerical simulation code has been written, and has allowed us to evaluate the temperature lift and thermal yield of 2 working pairs. Both high qualitative and quantitative performances have been obtained, so demonstrating the feasibility and industrial interest for such a cycle. Moreover a comparison of the simulation results with performances really obtained on an experimental ADHT has confirmed the pertinence of the simulation code.     

IAda: A language for robot programming based on Ada

We present a programming language for robots which we have implemented based on the Ada language. It is an interpreted language which permits dynamic configuration of software. It manipulates Ada tasks and subroutines. One of the Ada tasks is an inference engine of a logic programming language adapted to real-time constraints. We show how the conjunction of Ada tasks, to perform perception and action functions on the robot, to logic programs, for the control of these tasks, both manipulated by the IAda language, gives a powerful environment for robot programming.     

Protection contre les erreurs en enregistrement magnétique numérique de télévision

In this paper the authors present the main problem of operating video tape recorders for television production, viz. picture degradations through multiple generations, which could be cancelled by using digital machines. Efficient error protection is mandatory. Burst error statistics are given as collected on a laboratory digital recorder as well as a physical interpretation. Different protection methods are used for luminance and colour differences, which results in sharing the available redundancy between two distinct coding systems. Adequate codes are selected through the use of two bounds stated as theorems. The main parameters of a possible system are presented. They are likely to be improved when further information is available to make an operating system practical.