Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
WEIGHTED STATISTICAL CONVERGENCE
219
223
EN
V.
KARAKAYA
Department of Mathematical Engineering, Yildiz Technical University, Davutpasa
Campus, Esenler, 34750 Istanbul, Turkey
vkkaya@yildiz.edu.tr
T. A.
CHISHTI
Center of Distance Education, University of Kashmir, Srinagar, India
10.22099/ijsts.2009.2217
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.
Norlund-type means,weighted statistical convergence,sequence spaces,Cesaro summability
http://ijsts.shirazu.ac.ir/article_2217.html
http://ijsts.shirazu.ac.ir/article_2217_176bc8128ea526368e2bcc429ae97a23.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
ESTIMATION OF GALAXY AGE BY MODIFIED MEYER AND SHRAMM NUCLEOSYNTHESIS MODEL
225
233
EN
M. R.
ESKANDARI
Islamic Azad University, Shiraz Branch, I. R. of Iran
eskandari@physics.susc.ac.ir
M.
BAHADORAN
Islamic Azad University, Shiraz Branch, I. R. of Iran
10.22099/ijsts.2009.2218
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.
Nucleosynthesis,cosmochronology,age of universe,independent model,galaxy evolution,chronometric pairs,abundances
http://ijsts.shirazu.ac.ir/article_2218.html
http://ijsts.shirazu.ac.ir/article_2218_4aecaa13eb3d2693ffdecfc3801786e7.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
A GENERALIZED SUMMABILITY FACTOR THEOREM FOR ABSOLUTE SUMMABILITY AND QUASI POWER INCREASING SEQUENCES
235
240
EN
E.
SAVAS
Department of Mathematics, Istanbul Commerce University, Uskudar, Istanbul, Turkey
ekremsavas@yahoo.com & esavas@iticu.edu.tr
10.22099/ijsts.2009.2219
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.
Generalized absolute summability,weighted mean matrix,cesaro matrix,summability factor
http://ijsts.shirazu.ac.ir/article_2219.html
http://ijsts.shirazu.ac.ir/article_2219_e0f8a4bf5159dc19e91050cd5e68a032.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
FINSLER METRICS WITH SPECIAL LANDSBERG CURVATURE
241
248
EN
A.
TAYEBI
Department of Mathematics and Computer Science, Qom University, Qom, I. R. of Iran
akbar.tayebi@gmail.com
E.
PEYGHAN
Department of Mathematics and Computer Science, Arak University, Arak, I. R. of Iran
e-peyghan@araku.ac.ir,
10.22099/ijsts.2009.2220
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.
Randers metric,flag curvature,Landsberg metric,P-reducible
http://ijsts.shirazu.ac.ir/article_2220.html
http://ijsts.shirazu.ac.ir/article_2220_7bbea45db2071e12f2c72620d637da2f.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
COMMON FIXED POINTS OF TWO NONEXPANSIVE MAPPINGS BY A NEW ONE-STEP ITERATION PROCESS
249
257
EN
S. H.
KHAN
Department of Mathematics, Statistics and Physics, Qatar University, Doha 2713, Qatar
safeer@qu.edu.qa & safeerhussain5@yahoo.com
M.
ABBAS
Department of Mathematics, Lahore University of Management
Sciences, 54792, Lahore, Pakistan
A. R.
KHAN
King Fahd University of Petroleum and Minerals, Department of Mathematics and Statistics,
Dhahran 31261, Saudi Arabia
10.22099/ijsts.2009.2221
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.
One-step Iteration Process,nonexpansive mapping,common fixed point,condition (A) weak and
strong convergence
http://ijsts.shirazu.ac.ir/article_2221.html
http://ijsts.shirazu.ac.ir/article_2221_9404272f263e0e8a6524fc174aec85fd.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
DESIGN AND CONSTRUCTION OF AN ACCURATE TIMING SINGLE CHANNEL ANALYZER
259
267
EN
A.
EZZATPANAH LATIFI
Radiation Application Group, Faculty of Nuclear Engineering,
Shahid Beheshti University, Tehran, I. R. of Iran
F.
ABBASI DAVANI
Radiation Application Group, Faculty of Nuclear Engineering,
Shahid Beheshti University, Tehran, I. R. of Iran
fabbasi@sbu.ac.ir
M.
SHAHRIARI
Radiation Application Group, Faculty of Nuclear Engineering,
Shahid Beheshti University, Tehran, I. R. of Iran
A.
SHARGHI IDO
Incubator Center of Technology Units of Shahid Beheshti University
P.O. Box: 1983963113, Tehran, I. R. of Iran
10.22099/ijsts.2009.2222
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.
Timing Single Channel Analyzer (TSCA),Constant Fraction Trailing Edge (CFTE),Lower Level
Discriminator (LLD),Upper Level Discriminator (ULD)
http://ijsts.shirazu.ac.ir/article_2222.html
http://ijsts.shirazu.ac.ir/article_2222_bd6af23bc81fcd9e0c8344e7af691c5f.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
ANALYSIS AND OPTIMIZATION OF A FISSION CHAMBER DETECTOR USING MCNP4C AND SRIM MONTE CARLO CODES
269
276
EN
K.
HADAD
School of Mechanical Engineering, Shiraz University, Shiraz, I. R. of Iran
hadadk@shirazu.ac.ir
M.
HASHEMI
Islamic Azad University, Science and Research Division, Tehran, I. R. of Iran
10.22099/ijsts.2009.2223
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.
Fission chamber,MCNP,GEANT4,SRIM,Optimization
http://ijsts.shirazu.ac.ir/article_2223.html
http://ijsts.shirazu.ac.ir/article_2223_44c462083c6af7fbd79868c8191c0ac6.pdf
Springer
Iranian Journal of Science and Technology (Sciences)
1028-6276
33
3
2009
09
13
STUDY OF NEUTRON YIELD FOR THE 241Am9Be SOURCE
277
280
EN
T.
KAKAVAND
Physics Department, Zanjan University, Zanjan, I. R. of Iran
M.
HAJI-SHAFEIEHA
Islamic Azad university of Qazvin, Qazvin, I. R. of Iran
m_h_shafeieha@yahoo.com
H.
GHAFOURIAN
Atomic Energy Organization of Iran, Tehran, I. R. of Iran
10.22099/ijsts.2009.2224
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.
Neutron,Beryllium,Americium,ALICE Code,SRIM Code,Neutron Yield
http://ijsts.shirazu.ac.ir/article_2224.html
http://ijsts.shirazu.ac.ir/article_2224_2386c79e3599fa454583916ce1f0b2bc.pdf