JOSA year 15 no. 2 (31)
eISSN 2068-3049

CONTENTS

SECTION A – Mathematics

1. SURFACE FAMILY WITH A COMMON NATURAL ASYMPTOTIC LIFT

(Ergin Bayram, Evren Ergün, Emin Kasap) / 117

2. THE NATURAL LIFT CURVE OF THE SPHERICAL INDICATRIX OF A TIMELIKE CURVE IN MINKOWSKI 4-SPACE

(Evren Ergün) / 125

3. IMPROVED PRIME GENERATING ALGORITHMS BY SKIPPING COMPOSITE DIVISORS AND EVEN NUMBERS (OTHER THAN 2)

(Neeraj Anant Pande) / 135

4. SOLVING SYSTEM OF SECOND ORDER BOUNDARY VALUE PROBLEMS BY NUMEROV TYPE METHOD

(Pramod Kumar Pandey) / 143

5. SOME PROPERTIES OF THE GENERALIZED COMPLETE AND INCOMPLETE BETA FUNCTIONS

(Rakesh K. Parmar, Sunil Dutt Purohit, Mukesh M Joshi) / 151

6. SOME APPLICATIONS FROM STUDENT’S CONTESTS ABOUT THE GROUP OF AUTOMORPHISMS OF Z_n

(Georgiana Velicu, Elena Catalina Grindei) / 155

SECTION B – Chemistry

1. STRUCTURAL HARDENING MECHANISM OF THE NICKEL-BASED ALLOY “HASTELLOY G30”

(O. Ben Lenda, F. Sabir, S. Saissi, A. Ibnlfassi, Y.Tamraoui , F. Mirinioui, L. Zerrouk, B.Manoun, E. Saad) / 165

2. DETERMINATION OF Cu AND Zn IN SAMPLES OF GRAPE AND SOIL FROM MURFATLAR VINEYARD

(Nicoleta Matei, Antoanela Popescu, Horatiu Miresan, Georgeta Pavalache) / 175

SECTION C – Physics

1. NEW DESIGN OF A GREENHOUSE SOLAR DISTILLER COUPLED WITH PARABOLIC TROUGH AND THE ENERGY BALANCE OF THIS SYSTEM

(Khalid Guissi, Abdelmoumen Tabyaoui, Mohamed Harmouchi, Azeddine Mouhsen, El Mostafa Oualim, Abdellah Boulal) / 181

2. DESCRIPTIVE STATISTICS AND CROSS CORRELATION OF SOME VOCAL AND ACOUSTIC PARAMETERS INVOLVED IN LIVE BROADCASTIG

(Valentin Ghisa, Sorin Moraru) / 191