The leaves, stalks and roots of Globularia alypum L., have been examined. Ten phenolic acids have been identified: eight by two dimensional TLC and the remainder by reverse phase HPLC using an internal standard. Seven of these acids have not previously been reported.
B. Ben Hassine, A.M. Bui, Z. Mighri
The search for low cost warm water producing systems with sun energy led us to build flat solar collectors made of concrete. A water - heating device with natural circulation of water has been studied. The tests achieved on the apparatus and its performances are described. Our first results suggest some further improvements to be affected in the device.
A. Bellagi, A. Ganne, J. Piro, P. Pierson, J. Hamida, M. Azaiez
The coupling of a flat-plate collectors with evaporators has been studied to realize a pilot plant working during sunshine. The optimisation of evaporator-flat-plate collector assembly with classical models in transient regime leads to a prohibitive method of calculation. So it is necessary to search an adapted methodology using chemical engineering and meteorology sunshine models.
R. Bes, S. Gabsi, J.C. Mora, M. Bouabdallah
Study of MrPO3 - Be(PO3)2 systems where Mr = Li, Na, K, with D.T.A. technique shows the existence of five compounds :
LiBe(PO3)3, Na4Be(PO3)6, NaBe(PO3)3, K2Be(PO3)4 and KBe(PO3)3 ; only Na4Be(PO3)6 is melting congruently. The chemical preparation and crystal data of these new compounds are given. The Weissenberg camera is used to determine the unit cell of LiBe(PO3)2 which is monoclinic:
a: 14,713(4) A b: 28,122 (5)A
c: 10,075 (2) Å ga: 97,12 (4) degrés
K. Omezzine, N. Kbir-Ariguib.
Extraction data of Uranium in nitric medium are obtained with a copolymer styrene / divinylbenzene containing the di (ethyl - 2) hexyl phosphoric acid (HDEHP) as selective extractant. For this newly developed material, HDEHP losses are negligible, equilibrium is reached quickly and exchange phenomenon is reversible.
B. Hamrouni (Ex. Jemli), A. Billon