eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
139
143
10.22099/ijsts.2009.2209
2209
INEQUALITIES FOR MEROMORPHICALLY P-VALENT FUNCTIONS
A. EBADIAN
a.ebadian@urmia.ac.ir
1
SH. NAJAFZADEH
2
Department of Mathematics, Faculty of Science, Urmia University, Urmia, I. R. of Iran
Department of Mathematics, University of Maragheh, Maragheh, I. R. of Iran
The aim of this paper is to prove some inequalities for p-valent meromorphic functions in the<br />punctured unit disk Δ* and find important corollaries.
http://ijsts.shirazu.ac.ir/article_2209_9f1c9605d6234b994a3831b7f52d53ce.pdf
p-valent functions
meromorphic starlike function
convex
close-to-convex
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
145
158
10.22099/ijsts.2009.2210
2210
N-ARY POLYGROUPS
M. GHADIRI
mghadiri@yazduni.ac.ir
1
B. N. WAPHARE
2
Department of Mathematics, Yazd University, Yazd, I. R. of Iran
Department of Mathematics, University of Pune, Pune, India
Polygroups are multivalued systems that satisfy group like axioms. In this paper the class of n-ary<br />polygroups is introduced. The concepts of n-ary normal subpolygroups and strong homomorphisms of n-ary<br />polygroups are adopted. With respect to these concepts the isomorphism theorems for n-ary polygroups are<br />stated and proved. Finally, we will consider the fundamental relation * defined on an n-ary polygroup and<br />prove some results in this respect.
http://ijsts.shirazu.ac.ir/article_2210_33be221c3bf789b5deb0c97fadd69fe8.pdf
n-ary polygroup
n-ary normal subploygroup
isomorphism theorem
fundamental relation
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
159
168
10.22099/ijsts.2009.2211
2211
1-TYPE AND BIHARMONIC FRENET CURVES IN LORENTZIAN 3-SPACE
H. KOCAYIGIT
huseyin.kocayigit@bayar.edu.tr
1
H. H. HACISALIHOGLU
2
Celal Bayar University, Faculty of Science and Arts Department of Mathematics Muradiye Campus, Muradiye, Manisa, Turkey
Ankara University, Faculty of Science, Department of Mathematics, Tandogan, Ankara, Turkey
1-type and biharmonic curves by using Laplace operator in Lorentzian 3-space are<br />studied and some theorems and characterizations are given for these curves.
http://ijsts.shirazu.ac.ir/article_2211_9752964b343a95c33b6aa4fbc6118beb.pdf
– 1-type curve
biharmonic curve
Helix
degenerate helices
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
169
177
10.22099/ijsts.2009.2212
2212
ALMOST CONVERGENCE THROUGH THE GENERALIZED DE LA VALLÉE-POUSSIN MEAN
M. MURSALEEN
mursaleenm@gmail.com
1
A. M. JARRAH
2
S. A. MOHIUDDINE
3
Department of Mathematics, Aligarh Muslim University, Aligarh 202002, India
Department of Mathematics, Yarmouk University, Irbid, Jordan
Department of Mathematics, Aligarh Muslim University, Aligarh 202002, India
Lorentz characterized the almost convergence through the concept of uniform convergence of de la<br />Vallée-Poussin mean. In this paper, we generalize the notion of almost convergence by using the concept of<br />invariant mean and the generalized de la Vallée-Poussin mean. We determine the bounded linear operators for<br />the generalized σ-conservative, σ-regular and σ-coercive matrices.
http://ijsts.shirazu.ac.ir/article_2212_d1e55ec4c0da81e23f83a7453123ef25.pdf
sequence spaces
invariant mean
matrix transformation
bounded linear operators
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
179
186
10.22099/ijsts.2009.2213
2213
ON A SPECIAL CLASS OF FINSLER METRICS
A. TAYEBI
1
E. PEYGHAN
epeyghan@gmail.com
2
Department of Mathematics and Computer Science, Qom University, Qom, I. R. of Iran
Department of Mathematics, Faculty of Science, Arak University, Arak, I. R. of Iran
In this paper, we study projective Randers change and C-conformal change of P-reducible<br />metrics. Then we show that every P-reducible generalized Landsberg metric of dimension n 2 must be a<br />Landsberg metric. This implies that on Randers manifolds the notions of generalized Landsberg metric and<br />Berwald metric are equivalent.
http://ijsts.shirazu.ac.ir/article_2213_2031af62a001b9946fc1cedeeb4112da.pdf
Randers metric
Landsberg metric
Berwald metric
Randers change
C-conformal change
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
187
194
10.22099/ijsts.2009.2214
2214
A CLASS OF LIFT METRICS ON FINSLER MANIFOLDS
E. PEYGHAN
e-peyghan@araku.ac.ir,
1
A. TAYEBI
akbar.tayebi@gmail.com
2
Department of Mathematics and Computer Science, Arak University, Arak, I. R. of Iran
Department of Mathematics, Faculty of Science, Qom University, Qom, I. R. of Iran
In this paper, we are going to study the g-natural metrics on the tangent bundle of Finsler<br />manifolds. We concentrate on the complex and Kählerian and Hermitian structures associated with Finsler<br />manifolds via g-natural metrics. We prove that the almost complex structure induced by this metric is a<br />complex structure on tangent bundle if and only if the Finsler metric is of scalar flag curvature. Then we show<br />that the complex structure is Hermitian if and only if the Finsler metric is of constant flag curvature.
http://ijsts.shirazu.ac.ir/article_2214_0dccc75738900c9463fd320add2681f7.pdf
finsler manifold
G-natural metrics
Kähler structure
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
195
201
10.22099/ijsts.2009.2215
2215
THE INVOLUTE-EVOLUTE OFFSETS OF RULED SURFACES
E. KASAP
1
S. YUCE
sayuce@yildiz.edu.tr
2
N. KURUOGLU
3
Ondokuz Mayis University, Science and Arts Faculty, Department of Mathematics, Kurupelit 55139, Samsun, Turkey
Yıldız Technical University, Faculty of Arts and Science, Department of Mathematics, Esenler, 34210, Istanbul, Turkey
University of Bahcesehir, Faculty of Arts and Science, Department of Mathematics and Computer Sciences, Besiktas, 34100, Istanbul, Turkey
In this study, a generalization of the theory of involute-evolute curves is presented for ruled<br />surfaces based on line geometry. Using lines instead of points, two ruled surfaces which are offset in the sense<br />of involute-evolute are defined. Moreover, the found results are clarified using computer-aided examples
http://ijsts.shirazu.ac.ir/article_2215_cee2e898ba7eb173d0f2d4497189f574.pdf
Ruled Surface
involute-evolute
differential geometry
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-06-11
33
2
203
211
10.22099/ijsts.2009.2216
2216
DESIGN AND CONSTRUCTION OF A HIGH PRECISION TAC
F. ESFANDI
1
M. SHAHRIARI
2
F. ABBASI DAVANI
fabbasi@sbu.ac.ir
3
A. SHARGHI IDO
4
Radiation Application Group, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, I. R. of Iran, Post Box No. 19839631130211
Radiation Application Group, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, I. R. of Iran, Post Box No. 19839631130211
Radiation Application Group, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, I. R. of Iran, Post Box No. 19839631130211
Shahid Beheshti University, Incubator Center of Technology Units, Tehran, I. R. of Iran
TAC (Time to Amplitude Convertor) is one of the most important time measurement instruments<br />which has great significance in many fields of science, especially radiation physics. A TAC unit has been<br />designed based on the START-STOP analog method and NIM (Nuclear Instrument Modules) standards. After<br />designing the circuit, it was simulated by PSPICE software and constructed by discrete and integrated<br />components. Accuracy of performance, linearity and time resolution of the TAC were checked in laboratory<br />condition and a neutron-gamma discrimination experiment was carried out using this TAC. Results of these<br />experiments and the spectrum of neutron-gamma discrimination completely agree with those from other<br />similar TACs, and are, to some extent, better.
http://ijsts.shirazu.ac.ir/article_2216_656b93a985618eee10003218bed10455.pdf
Time to Amplitude Converter (TAC)
START-STOP method
Integral Non Linearity (INL)
time
resolution
neutron-gamma discrimination