2018-10-23T03:07:12Z
http://ijsts.shirazu.ac.ir/?_action=export&rf=summon&issue=455
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
LIGHTLIKE RULED AND REVOLUTION SURFACES IN 3 1
A.
ALTIN
H.
KABADAYI
A.
SABUNCUOGLU
In this paper lightlike ruled surfaces in 3 1=(3,-dx2+dy2+dz2) are studied with respect to whether<br />ruling curves are spacelike or null. It is seen that, in the first case the Gaussian curvature of the ruled surfaces<br />vanishes. In the second case the Gaussian curvature of the ruled surfaces are negative. In the second case<br />lightlike ruled surfaces are totally umbilical. Furthermore, lightlike surfaces of revolution are shown to be<br />only cones, and the second type lightlike ruled surface.
Lightlike surface
lightlike ruled surface
lightlike revolution surface
2010
10
10
95
101
http://ijsts.shirazu.ac.ir/article_2168_966d251fe029379c9662704899e31279.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
ON THE CASES OF EXPLICIT SOLVABILITY OF A THIRD ORDER PARTIAL DIFFERENTIAL EQUATION
A.
MAHER
YE. A.
UTKINA
In this paper, the Goursat problem of a third order equation on cases of explicit solvability is<br />investigated, with the help of the Riemann function. Some results and one theorem are given concerning the<br />existence and uniqueness for the solution of the suggested problem.
Third order partial differential equation
the Goursat problem
the Riemann function
2010
10
10
103
112
http://ijsts.shirazu.ac.ir/article_2169_4c79b0a21011e167ffb9870fa6a0a4ab.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
REDUCED DIFFERENTIAL TRANSFORM METHOD FOR SOLVING LINEAR AND NONLINEAR WAVE EQUATIONS
Y.
KESKIN
G.
OTURANC
Reduced differential transform method (RDTM) is applied to various wave equations. To assess<br />the accuracy of the solutions, we compare the results with the exact solutions and variational iteration method.<br />The results reveal that the RDTM is very effective, convenient and quite accurate to systems of nonlinear<br />equations.
Reduced differential transform method
wave equation
2010
10
10
113
122
http://ijsts.shirazu.ac.ir/article_2170_2f253f0409a3300d7aa942dfd208a1c7.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
TWO-DIMENSIONAL MAGMA FLOW
A.
MEHMOOD
A.
ALI
Exact solution for steady two-dimensional flow of an incompressible magma is obtained. The<br />magmatic flow is studied by considering the magma as a second grade fluid. The governing partial<br />differential equations are transformed to ordinary differential equations by symmetry transformations. Results<br />are discussed through graphs to understand the rheology of the flowing magma
Magma flow
second-grade fluid
symmetry analysis
exact solution
controlling eruption
2010
10
10
123
130
http://ijsts.shirazu.ac.ir/article_2171_81ef0cb3313dcbfedbe0b9308ae0f359.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
ELECTRONIC AND STRUCTURAL PROPERTIES OF TIN DIOXIDE IN CUBIC PHASE
A.
ARYADOUST
SALEHI
H.
M.
FARBOD
The electronic structure, energy band structure and electronic density of 2 SnO ceramic in cubic<br />phase have been investigated using first principle full potential-linearized augmented plane wave (FP-LAPW)<br />method within density functional theory (DFT). Local density approximation (LDA) and the generalized<br />gradient approximation (GGA), which are based on exchange- correlation energy optimization were used.<br />The band gap was 2.2 eV at point in the Brillouin zone within our approach. Calculations of the band<br />structure and electronic structure of 2 SnO were in a good agreement with the previous experimental and<br />theoretical results with different approximations. Moreover, electronic density map shows that the bonding<br />between Sn and O atoms is ionic.
Lattice constant
bulk module
ceramic 2 SnO
electronic structure
electronic density distribution
2010
10
10
131
138
http://ijsts.shirazu.ac.ir/article_2172_316285dc18231f30cea718418d965276.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
DISCRIMINANT ANALYSIS IN AR(p) PLUS DIFFERENT NOISES PROCESSES
B.
MANSOURI
R.
CHINIPARDAZ
G. A.
PARHAM
The problem of discrimination between two stationary AR(p) plus noise processes is considered<br />when the noise process are different in two models. The discrimination rule leads to a quadratic form with<br />cumbersome matrices. An approximate and analytic form is given to distribution of the discriminant. The<br />simulation study has been used to show the performance of discrimination rule. The cumulants of<br />discriminant function are obtained and show them to be very close to the true values given in literature.
Log-likelihood discrimination
AR(p) plus noise process
band matrix
pearson-curves
2010
10
10
139
150
http://ijsts.shirazu.ac.ir/article_2173_6dd1a5313b3be6c6f251bcafb9ba2a80.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
JOHNSON AMENABILITY FOR TOPOLOGICAL SEMIGROUPS
M.
MAYSAMI SADR
A.
POURABBAS
–A notion of amenability for topological semigroups is introduced. A topological semigroup S is<br />called Johnson amenable if for every Banach S -bimodule E , every bounded crossed homomorphism from<br />S to E* is principal. In this paper it is shown that a discrete semigroup S is Johnson amenable if and only if<br />1(S) is an amenable Banach algebra. Also, we show that if a topological semigroup S is Johnson amenable,<br />then it is amenable, but the converse is not true.
amenability
crossed homomorphism
topological semigroup
2010
10
10
151
160
http://ijsts.shirazu.ac.ir/article_2174_2990e75e6c1a45f163ad031807c50123.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2010
34
2
APPROXIMATE SOLUTION TO BOUNDARY VALUE PROBLEMS BY THE MODIFIED VIM
M.
HEYDARI
G. B.
LOGHMANI
This paper presents an efficient modification of the variational iteration method for solving<br />boundary value problems using the chebyshev polynomials. The proposed method can be applied to linear<br />and nonlinear models. The scheme is tested for some examples and the obtained results demonstrate the<br />reliability and efficiency of the proposed method.
Variational iteration method
Chebyshev polynomials
boundary value problems
2010
10
10
161
167
http://ijsts.shirazu.ac.ir/article_2175_efbef62a60b71d2f6b575df55bbbc88d.pdf