Philippe Laurent

Contraintes, déformation et déplacement dans Г avant-pays Nord-pyrénéen du Languedoc méditerranéen

ResumeLes donnees stratigraphiques et tectoniques concernant le Languedoc mediterraneen sont utilisees pour y decrire de facon synthetique la phase de deformation majeure, d’âge paleocene et eocene. Des cartes nouvelles de la contrainte compressive principale, σ1, du champ de deformation simplifie et du champ de deplacement sont presentees et discutees. Ces cartes sont completees par des coupes equilibrees qui rendent compte de la structure de la couverture et de l’allure probable des accidents du socle.Il ressort de cette etude que la trajectoire regionale de a, est relativement rectiligne avec une direction proche de N15E. Les perturbations d’echelle locale sont observees a l’approche des grands accidents preexistants, de direction moyenne NE-SW et Est-Ouest. A partir de cinq exemples reels, choisis en fonction de la geometrie des accidents, on montre que les perturbations locales de la trajectoire de o, sont explicables a l’aide des modeles theoriques deja decrits du champ de contrainte autour de disco...

Addition of RFI (CnF2n+1I; n=4, 6, 8) to allyl alcohol catalyzed by zinc in different solvents: application to the synthesis of F-alkyl epoxypropanes

Abstract The addition of RFI to allyl alcohol catalyzed by zinc in different solvents has beenstudied. The adduct RFCH2CHICH2OH readily gives the corresponding F-alkyl epoxypropane.

An interactive program for the graphical representation of striated faults and applied normal and tangential stresses

Accurate analysis of striated faults may lead to the calculation of the associated reduced stress tensor ?; this is defined by four parameters, namely the three principal stress orientations Si and a stress ellipsoid shape ratio i.e. ? = (?2 - ?3)/(?1 - ?3). For a given fault plane, the basic hypothesis is that the direction and sense of displacement St correspond to the tangential stress applied upon this plane.The program we propose is written in FORTRAN 77; for each striated fault, the tangential and normal stress vectors are computed with respect to the reduced stress tensor ?. The input data are the file of fault measurements and the four parameters of ?. The outputs are composed of: (1) the stereographic projection of fault planes with direction/sense of measured striation St and applied tangential stress. (2) A histogram of the angular differences between calculated tangential stresses and directions of striations. (3) Mohr circle for stress. An optional output is proposed for the case where only the principal stress directions Si are known; then Figures 1 and 3 are drawn for incremental variations of ? in the range 0,1. The resolved shear stress values along the directions of measured striations are also computed and plotted in the Mohr diagram. A synthetic fault set is used to illustrate the application of this program.

Synthesis of aliphatic diamine and polyetherimide with long perfluoroalkyl side chain

Abstract The monomer, 2-(perfluorohexylmethyl)butan-1,4-diamine (TFD), was prepared from itaconic acid dimethyl ester via the addition of perfluorohexyl iodide followed by the gradual transformation of ester groups into amino groups. The polymerization of bisphenol-A diphthalic anhydride (BAPA) with TFD led to hydrophobic fluorinated polyetherimide (FPEI) with RF=C6F13 side chain. This polymer makes it possible to cast films.

A new computer method for rapid and precise determination of calcite crystallographic orientation from U -stage measurements

Abstract CALCIT3 is an interactive program written in FORTRAN 77 for use on microcomputers (IBM compatible) for the complete determination of the crystallographic orientation of calcite crystals in thin sections. The input data are the U -Stage measurements of some e twin lamellae (01T2) or r cleavage (01T1) orientations. The interactivity of this program makes it possible for direct verification of the angular relationships between the measured planes; the positions of the missing planes then are calculated and the results, which concern only the e planes, are written to an ASCII file. The rotation matrix is calculated to rotate the data to the geographic reference frame. This program, which leads to a partial automation of the U -Stage measurements, is of interest for modern dynamic analysis of calcite twin lamellae and for petrofabric analyses of carbonate rocks, because the results are defined more accurately and rapidly than with classical methods.