COMBINED HEAT AND MASS TRANSFER IN MHD FREE CONVECTION FROM A WEDGE WITH OHMIC HEATING AND VISCOUS DISSIPATION IN THE PRESENCE OF SUCTION OR INJECTION
R.
KANDASAMY
Centre for Science Studies, University of Tun Hussein Onn, Malaysia,
86400 Parit Raja, Batu Pahat Johor, Malaysia
author
I.
HASHIM
School of Mathematical Sciences, University of Kebangsaan, Malaysia,
43600 UKM Bangi Selangor, Malaysia
author
A. B.
KHAMIS
Centre for Science Studies, University of Tun Hussein Onn, Malaysia,
86400 Parit Raja, Batu Pahat Johor, Malaysia
author
I.
MUHAIMIN
Centre for Science Studies, University of Tun Hussein Onn, Malaysia,
86400 Parit Raja, Batu Pahat Johor, Malaysia
author
text
article
2007
eng
The problem of combined heat and mass transfer of an electrically conducting fluid in MHDnatural convection adjacent to a vertical surface is analyzed, taking into account the effects of Ohmic heatingin the presence of suction or injection. An approximate numerical solution for the steady laminar boundarylayerflow over a wall of the wedge in the presence of species concentration and mass diffusion has beenobtained by solving the governing equations using the numerical technique. The fluid is assumed to beviscous and incompressible. Numerical calculations are carried out for different values of dimensionlessparameters and an analysis of the results obtained shows that the flow field is influenced appreciably by themagnetic effect, the buoyancy ratio between species and thermal diffusion and suction/injection at the wallsurface. Effects of these major parameters on transport behaviors are investigated methodically and typicalresults are illustrated to reveal the tendency of the solutions. Representative results are presented for thevelocity, temperature, and concentration distributions, as well as the local skin-friction coefficient and skinfriction.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
151
162
http://ijsts.shirazu.ac.ir/article_2324_f85ca468fa7afed222d5fef73f4909a2.pdf
dx.doi.org/10.22099/ijsts.2007.2324
ON PROBLEMS REDUCING TO THE GOURSAT PROBLEM FOR A FOURTH ORDER EQUATION
A.
MAHER
Department of Mathematics, Faculty of Science, Assiut University, 71516, Egypt
author
YE. A.
UTKINA
Department of Differential Equations, Kazan State University,
18 Kremlyovskaya St., Kazan, 420008, Russia
author
text
article
2007
eng
In this paper, we investigate some problems which can be reduced to the Goursat problem for afourth order equation. Some results and theorems are given concerning the existence and uniqence for thesolution of the suggested problem.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
163
170
http://ijsts.shirazu.ac.ir/article_2325_67776a597b75725198c49b9e4d70f7d9.pdf
dx.doi.org/10.22099/ijsts.2007.2325
HIGH SPIN STATES IN 191OS
S.
MOHAMMADI
Physics Department, Payam Noor University, Mashhad 91735, I. R. of Iran
author
ZS.
PODOLYAK
Department of Physics, University of Surrey, Guildford, GU2 7XH, UK
author
text
article
2007
eng
High spin states in the neutron rich nucleus 191Os has been populated for the first time using the82Se+192Os deep-inelastic reaction at 460 MeV beam energy using the ALPI accelerators at the LaboratoryNazionali di Legnaro, Italy. High fold γ-γ coincidences were acquired with the 4π spectrometer GASPdetector array, consisting of 40 Compton-suppressed, large-volume germanium detectors with an inner ballconsisting of 80 BGO crystals acting as a multiplicity filter and a total-energy spectrometer. The newdiscovered level scheme is extended up to spin 19/2+. The observed structure is interpreted as fragments of arotational band built on single neutron configuration {11/2+ [615]} according to a Nilsson deformed shellmodel.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
171
175
http://ijsts.shirazu.ac.ir/article_2326_9f20d131682480774cd48e1443251f9f.pdf
dx.doi.org/10.22099/ijsts.2007.2326
ON THE HELICES IN THE GALILEAN SPACE G3
A. O.
OGRENMIS
Department of Mathematics, Firat University, 23119, Elazig, Turkey
author
E.
ERGUT
Department of Mathematics, Firat University, 23119, Elazig, Turkey
author
M.
BEKTAS
Department of Mathematics, Firat University, 23119, Elazig, Turkey
author
text
article
2007
eng
T. Ikawa obtained an ordinary differential equation for the circular helix. Recently, the helix havebeen investigated by many differential geometers such as T. Ikawa, H. Balgetir, M. Bektas, M. Ergut, N.Ekmekci and H. H. Hacısalihoglu. In this paper, making use of this author’s methods, we obtainedcharacterizations of helix for a curve with respect to the Frenet frame in 3-dimensional Galilean space G3.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
177
181
http://ijsts.shirazu.ac.ir/article_2327_b01dbc7305fb6076018322b51bdadd31.pdf
dx.doi.org/10.22099/ijsts.2007.2327
DOUBLE SEQUENCE SPACES DEFINED BY ORLICZ FUNCTIONS
E.
SAVAS
Istanbul Ticaret University, Department of Mathematics, Uskudar, Istanbul, Turkey
author
R. F.
PATTERSON
University of North Florida, Building 11 Jacksonville, Florida 32224, USA
author
text
article
2007
eng
In this paper we introduce some new double sequence spaces using the Orlicz function andexamine some properties of the resulting sequence spaces.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
183
188
http://ijsts.shirazu.ac.ir/article_2328_6f2c9f3812a99498fab81db1a379565b.pdf
dx.doi.org/10.22099/ijsts.2007.2328
SEQUENTIAL ESTIMATION IN A SUBCLASS OF EXPONENTIAL FAMILY UNDER WEIGHTED SQUARED ERROR LOSS
N.
NEMATOLLAHI
Department of Statistics, Faculty of Economics, Allameh Tabataba'i University, Tehran, I. R. of Iran
author
M.
JAFARI JOZANI
Department of Statistics, Faculty of Economics, Allameh Tabataba'i University, Tehran, I. R. of Iran
author
N.
MAHLOOJI
Department of Statistics, Faculty of Economics, Allameh Tabataba'i University, Tehran, I. R. of Iran
author
text
article
2007
eng
In a subclass of the scale-parameter exponential family, we consider the sequential pointestimation of a function of the scale parameter under the loss function given as the sum of the weightedsquared error loss and a linear cost. For a fully sequential sampling scheme, second order expansions areobtained for the expected sample size as well as for the regret of the procedure. The former researches onGamma and Exponential distributions can be deduced from our general results.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
189
197
http://ijsts.shirazu.ac.ir/article_2329_ef4dc04839d1c9f19b144aa44df81031.pdf
dx.doi.org/10.22099/ijsts.2007.2329
MINIMIZING LOSS PROBABILITY IN QUEUING SYSTEMS WITH HETEROGENEOUS SERVERS
V.
SAGLAM
Department of Statistic, Faculty of Arts and Sciences, Ondokuz
Mayis University, Kurupelit, 55139-Samsun, Turkey,
author
A.
SHAHBAZOV
Department of Statistic, Faculty of Arts and Sciences, Ondokuz
Mayis University, Kurupelit, 55139-Samsun, Turkey
author
text
article
2007
eng
The probability of losing a customer in M/G/n/0 and GI/M/n/0 loss queuing systems withheterogeneous servers is minimized. The first system uses a queue discipline in which a customer who arriveswhen there are free servers chooses any one of them with equal probability, but is lost otherwise. Providedthat the sum of the servers rates are fixed, loss probability in this system attains minimum value when all theservice rates are equal. The second system uses queue discipline, in which a customer who enters into thesystem is assigned to the server with the lowest number. Loss probability in this system takes the minimumvalue in the case when the fastest server rule is used in which an incoming customer is served by the freeserver with the shortest mean service time. If the mean of the arrival distribution is fixed, then loss probabilityis minimized by deterministic arrival distribution
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
199
206
http://ijsts.shirazu.ac.ir/article_2330_6901ed3bf3527b64512d59331e0f5239.pdf
dx.doi.org/10.22099/ijsts.2007.2330
STEINER FORMULA AND HOLDITCH-TYPE THEOREMS FOR HOMOTHETIC LORENTZIAN MOTIONS
S.
YUCE
Yıldız Technical University, Faculty of Arts and Science, Department of Mathematics, Esenler, 34210,
Istanbul, Turkey,
author
N.
KURUOGLU
University of Bahcesehir, Faculty of Arts and Science, Department of
Mathematics and Computer Sciences, Besiktas 34100, Istanbul, Turkey
author
text
article
2007
eng
The present paper is concerned with the generalization of the Holditch Theorem under oneparameterhomothetic motion on Lorentzian planes. In this paper, for the homothetic Lorentzian motion, weexpressed the Steiner formula. Furthermore, we present the Holditch-Type Theorems.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
207
212
http://ijsts.shirazu.ac.ir/article_2331_e2decd10f598924fc8320c13325124c7.pdf
dx.doi.org/10.22099/ijsts.2007.2331
A BOUNDARY INTEGRAL MODEL FOR SIMULATING SPILLING BREAKERS
S. A.
AZARMSA
Faculty of Marine Sciences, Tarbiat Modares University, Tehran, I. R. of Iran
author
text
article
2007
eng
A boundary integral method is used to simulate spilling breakers. The bottom is also included inthe introduced closed boundary and the problem is directly solved in the physical plane. The method has beenshown to be remarkably stable, and no numerical instability has occurred in any of the calculations. Theresults reveal that both the momentum and total energy are almost constant in time during the simulationperiod. As a result, the breaking process of a spilling breaker is fairly well simulated.
Iranian Journal of Science and Technology (Sciences)
Springer
1028-6276
31
v.
2
no.
2007
213
217
http://ijsts.shirazu.ac.ir/article_2332_e1952cb184e26c8f0bdeb548cb62fafb.pdf
dx.doi.org/10.22099/ijsts.2007.2332