eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
219
223
10.22099/ijsts.2009.2217
2217
WEIGHTED STATISTICAL CONVERGENCE
V. KARAKAYA
vkkaya@yildiz.edu.tr
1
T. A. CHISHTI
2
Department of Mathematical Engineering, Yildiz Technical University, Davutpasa Campus, Esenler, 34750 Istanbul, Turkey
Center of Distance Education, University of Kashmir, Srinagar, India
In this paper, the notion of N, pn - summability to generalize the concept of statistical<br />convergence is used. We call this new method weighted statistically convergence. We also establish its<br />relationship with statistical convergence, C,1-summability and strong n N, p -summability.
http://ijsts.shirazu.ac.ir/article_2217_176bc8128ea526368e2bcc429ae97a23.pdf
Norlund-type means
weighted statistical convergence
sequence spaces
Cesaro summability
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
225
233
10.22099/ijsts.2009.2218
2218
ESTIMATION OF GALAXY AGE BY MODIFIED MEYER AND SHRAMM NUCLEOSYNTHESIS MODEL
M. R. ESKANDARI
eskandari@physics.susc.ac.ir
1
M. BAHADORAN
2
Islamic Azad University, Shiraz Branch, I. R. of Iran
Islamic Azad University, Shiraz Branch, I. R. of Iran
The independent model used by Meyer and Schramm (here after M&S) for determining the age of<br />elements (chemical evolution) is extended. Using new and extended definitions and including parameters<br />ignored by M&S, the galactic evolution equations are solved to determine the total duration of<br />nucleosynthesis,T. To be able to calculate the t T (mean age time for formation of elements to total duration of nucleosynthesis ratio), one event age, max ij , and r(i, j) are determined using approximation relating r(i, j) to the former value r(i, j). For Th/U pair, constraint on t T becomes 0.43 t T 0.61 and the age of the galaxy is obtained as 12.5 23.0 Gal Gyr T Gyr , reducing the variation considerably<br />compared to M&S formalism ( 8.7Gyr TGal 28.1 Gyr ). The range of constraints for the age of the<br />universe is shorter than the M&S and our modifications on the model have reduced the interval for galaxy age 83% and close to being concordant with other available methods.
http://ijsts.shirazu.ac.ir/article_2218_4aecaa13eb3d2693ffdecfc3801786e7.pdf
Nucleosynthesis
cosmochronology
age of universe
independent model
galaxy evolution
chronometric pairs
abundances
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
235
240
10.22099/ijsts.2009.2219
2219
A GENERALIZED SUMMABILITY FACTOR THEOREM FOR ABSOLUTE SUMMABILITY AND QUASI POWER INCREASING SEQUENCES
E. SAVAS
ekremsavas@yahoo.com & esavas@iticu.edu.tr
1
Department of Mathematics, Istanbul Commerce University, Uskudar, Istanbul, Turkey
The object of this paper is to establish a summability factor theorem for summability<br />A, , k 1 k where A is the lower triangular matrix with non-negative entries satisfying certain conditions.
http://ijsts.shirazu.ac.ir/article_2219_e0f8a4bf5159dc19e91050cd5e68a032.pdf
Generalized absolute summability
weighted mean matrix
cesaro matrix
summability factor
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
241
248
10.22099/ijsts.2009.2220
2220
FINSLER METRICS WITH SPECIAL LANDSBERG CURVATURE
A. TAYEBI
akbar.tayebi@gmail.com
1
E. PEYGHAN
e-peyghan@araku.ac.ir,
2
Department of Mathematics and Computer Science, Qom University, Qom, I. R. of Iran
Department of Mathematics and Computer Science, Arak University, Arak, I. R. of Iran
In this paper, we study a class of Finsler metrics which contains the class of P-reducible and<br />general relatively isotropic Landsberg metrics, as special cases. We prove that on a compact Finsler manifold,<br />this class of metrics is nothing other than Randers metrics. Finally, we study this class of Finsler metrics with<br />scalar flag curvature and find a condition under which these metrics reduce to Randers metric.
http://ijsts.shirazu.ac.ir/article_2220_7bbea45db2071e12f2c72620d637da2f.pdf
Randers metric
flag curvature
Landsberg metric
P-reducible
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
249
257
10.22099/ijsts.2009.2221
2221
COMMON FIXED POINTS OF TWO NONEXPANSIVE MAPPINGS BY A NEW ONE-STEP ITERATION PROCESS
S. H. KHAN
safeer@qu.edu.qa & safeerhussain5@yahoo.com
1
M. ABBAS
2
A. R. KHAN
3
Department of Mathematics, Statistics and Physics, Qatar University, Doha 2713, Qatar
Department of Mathematics, Lahore University of Management Sciences, 54792, Lahore, Pakistan
King Fahd University of Petroleum and Minerals, Department of Mathematics and Statistics, Dhahran 31261, Saudi Arabia
We introduce a new one-step iteration process to approximate common fixed points of two<br />nonexpansive mappings in Banach spaces and prove weak convergence of the iterative sequence using (i)<br />Opial’s condition and (ii) Kadec-Klee property. Strong convergence theorems are also established in Banach<br />spaces and uniformly convex Banach spaces under the so-called Condition ( A ), which is weaker than<br />compactness.
http://ijsts.shirazu.ac.ir/article_2221_9404272f263e0e8a6524fc174aec85fd.pdf
One-step Iteration Process
nonexpansive mapping
common fixed point
condition (A) weak and
strong convergence
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
259
267
10.22099/ijsts.2009.2222
2222
DESIGN AND CONSTRUCTION OF AN ACCURATE TIMING SINGLE CHANNEL ANALYZER
A. EZZATPANAH LATIFI
1
F. ABBASI DAVANI
fabbasi@sbu.ac.ir
2
M. SHAHRIARI
3
A. SHARGHI IDO
4
Radiation Application Group, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, I. R. of Iran
Radiation Application Group, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, I. R. of Iran
Radiation Application Group, Faculty of Nuclear Engineering, Shahid Beheshti University, Tehran, I. R. of Iran
Incubator Center of Technology Units of Shahid Beheshti University P.O. Box: 1983963113, Tehran, I. R. of Iran
In this paper we discuss an approach to the design and construction of an accurate timing single<br />channel analyzer (TSCA) for the timing of pulses over a wide dynamic range. A brief overview of the timing<br />methods and uncertainty factors as "walk and jitter" and a detailed description of the TSCA circuit are given<br />together with some insight into the application and reasons that led us to the design and construction of<br />constructed TSCA. The advantages of this instrument are then highlighted and the experimental results are<br />presented.
http://ijsts.shirazu.ac.ir/article_2222_bd6af23bc81fcd9e0c8344e7af691c5f.pdf
Timing Single Channel Analyzer (TSCA)
Constant Fraction Trailing Edge (CFTE)
Lower Level
Discriminator (LLD)
Upper Level Discriminator (ULD)
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
269
276
10.22099/ijsts.2009.2223
2223
ANALYSIS AND OPTIMIZATION OF A FISSION CHAMBER DETECTOR USING MCNP4C AND SRIM MONTE CARLO CODES
K. HADAD
hadadk@shirazu.ac.ir
1
M. HASHEMI
2
School of Mechanical Engineering, Shiraz University, Shiraz, I. R. of Iran
Islamic Azad University, Science and Research Division, Tehran, I. R. of Iran
In this study, a general theoretical model to foresee and calculate the current-voltage<br />characteristics in a plateau zone and the associated efficiency of the neutron detector (sensitivity) is presented. This study is to complete the previous studies in this field. The model also considers electric field distortion resulting from the charge collection effect. The characteristics curve is obtained as a function of fission rate, chamber geometry, and filling gas pressure. The output current at the saturation domain is calculated. The applied voltages about two phenomena, recombination and avalanche, for working the chamber in an ionization zone are an important part of the calculation. In developing the theoretical model, the MCNP code for fission rate, the SRIM code for electron-ion pair and GEANT4 for gamma sensitivity calculations were used.
http://ijsts.shirazu.ac.ir/article_2223_44c462083c6af7fbd79868c8191c0ac6.pdf
Fission chamber
MCNP
GEANT4
SRIM
Optimization
eng
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
1028-6276
2009-09-13
33
3
277
280
10.22099/ijsts.2009.2224
2224
STUDY OF NEUTRON YIELD FOR THE 241Am9Be SOURCE
T. KAKAVAND
1
M. HAJI-SHAFEIEHA
m_h_shafeieha@yahoo.com
2
H. GHAFOURIAN
3
Physics Department, Zanjan University, Zanjan, I. R. of Iran
Islamic Azad university of Qazvin, Qazvin, I. R. of Iran
Atomic Energy Organization of Iran, Tehran, I. R. of Iran
Beryllium chemical combination has a considerable effect on the design and fabrication of the<br />241Am9Be neutron source. In this investigation the beryllium combinations were studied as a generator of<br />neutrons with various mass percentage, and the neutron yields were also calculated using the results of the<br />ALICE and SRIM codes calculations per unit incident charge. The neutron yields of Beryllium Hydride,<br />Beryllium Carbide, Beryllium Hydroxide, Beryllium Oxide, Beryllium Acetate, Beryllium Acetylacetonate<br />and Beryllium Sulfate were calculated as 4397.992107 , 1511.184107 , 976.609107 , 595.299 107 , 336.163107 , 169.62107 and 149.053107 respectively. Our calculations indicate that, the Beryllium Hydride is a proper material for use in the 241Am9Be neutron source.
http://ijsts.shirazu.ac.ir/article_2224_2386c79e3599fa454583916ce1f0b2bc.pdf
Neutron
Beryllium
Americium
ALICE Code
SRIM Code
Neutron Yield