Editor-in Chief:
Valentin-Ionel VLAD
Editorial and Advisory Board:
Mathematics: Technical Sciences:
Marius IOSIFESCU - Topical editor Dorel BANABIC - Topical editor
Viorel BARBU Mihail-Viorel BĂDESCU
Lucian BEZNEA Adrian BEJAN (USA)
Vasile BRÎNZANESCU Ion-Gheorghe BOLDEA
Solomon MARCUS
Horia COLAN
Mihnea COLȚOIU Dan DUBINĂ
Petru MOCANU Alexandru-Mihail MOREGA
Nicolae POPA Tudor SIRETEANU
Vasile PREDA Cristian TEODOSIU (France)
Tudor ZAMFIRESCU (Sweden) Ladislau VEKÁS
Physics: Information Science:
Dumitru MIHALACHE - Topical editor Dan TUFIȘ - Topical editor
Ștefan ANTOHE Ioan DUMITRACHE
Emil BURZO Florin FILIP
Cornel HAȚEGAN Radu ION
Stefan HELL (Germany) Mihai ROCO (USA)
Nicolae IONESCU-PALLAS Petre STOICA (Sweden)
Tudor MARIAN Gheorghe TECUCI
Mihai MIREA Horia-Nicolai TEODORESCU
Ioan-Ioviț POPESCU Nicolae ȚĂPUȘ
  Mihail VOICU
Scientific Editorial Secretary:
Dinu BRATOSIN  
Technical Editor: Technical Editorial Secretary:
Irina FILIP Virginia RĂDĂȘAN
Computer Editing: Cover by:
Magdalena JINBICEANU Mariana MOCANU
The journal is published four times a year.
The journal can be found at the web addresses: www.academiaromana.ro and www.ear.ro
All orders should be sent to:

EDITURA ACADEMIEI ROMÂNE, Calea 13 Septembrie nr. 13, sector 5, P.O. Box 5-42, Bucharest, Romania, RO-76117; Phone/Fax 401-410-3983; 401-410-3448, Phone 401-411-9008.

RODIPET SA, Piața Presei Libere nr. 1, sector 1, P.O. Box 33-57, Bucharest, Romania,
Fax 401-222-6407, Phone 401-618-5103; 401-222-4126.

ORION PRESS IMPEX 2000, P.O. Box 77–19, Bucharest, Romania, Fax 401-324-0638,
Phone 401-653-7985.
Manuscripts, correspondence as well as journals in exchange should be sent to:

Dr. Dinu BRATOSIN

Romanian Academy, Technical Sciences Department,
Calea Victoriei 125, RO-010071, Bucharest, Romania,
Phone 40 1-212-8660; Fax 40 1-211-6608; E-mail: bratosin@acad.ro
copyright © Academia Română 2006

copyright © Academia Română 2006