2009
33
3
3
0
WEIGHTED STATISTICAL CONVERGENCE
2
2
In this paper, the notion of N, pn  summability to generalize the concept of statisticalconvergence is used. We call this new method weighted statistically convergence. We also establish itsrelationship with statistical convergence, C,1summability and strong n N, p summability.
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219
223


V.
KARAKAYA
Department of Mathematical Engineering, Yildiz Technical University, Davutpasa
Campus, Esenler, 34750 Istanbul, Turkey
Department of Mathematical Engineering, Yildiz
Turkey
vkkaya@yildiz.edu.tr


T. A.
CHISHTI
Center of Distance Education, University of Kashmir, Srinagar, India
Center of Distance Education, University
India
Norlundtype means
weighted statistical convergence
sequence spaces
Cesaro summability
ESTIMATION OF GALAXY AGE BY MODIFIED MEYER AND SHRAMM NUCLEOSYNTHESIS MODEL
2
2
The independent model used by Meyer and Schramm (here after M&S) for determining the age ofelements (chemical evolution) is extended. Using new and extended definitions and including parametersignored by M&S, the galactic evolution equations are solved to determine the total duration ofnucleosynthesis,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 considerablycompared to M&S formalism ( 8.7Gyr TGal 28.1 Gyr ). The range of constraints for the age of theuniverse 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.
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225
233


M. R.
ESKANDARI
Islamic Azad University, Shiraz Branch, I. R. of Iran
Islamic Azad University, Shiraz Branch, I.
Iran
eskandari@physics.susc.ac.ir


M.
BAHADORAN
Islamic Azad University, Shiraz Branch, I. R. of Iran
Islamic Azad University, Shiraz Branch, I.
Iran
Nucleosynthesis
cosmochronology
age of universe
independent model
galaxy evolution
chronometric pairs
abundances
A GENERALIZED SUMMABILITY FACTOR THEOREM FOR ABSOLUTE SUMMABILITY AND QUASI POWER INCREASING SEQUENCES
2
2
The object of this paper is to establish a summability factor theorem for summabilityA, , k 1 k where A is the lower triangular matrix with nonnegative entries satisfying certain conditions.
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235
240


E.
SAVAS
Department of Mathematics, Istanbul Commerce University, Uskudar, Istanbul, Turkey
Department of Mathematics, Istanbul Commerce
Turkey
ekremsavas@yahoo.com & esavas@iticu.edu.tr
Generalized absolute summability
weighted mean matrix
cesaro matrix
summability factor
FINSLER METRICS WITH SPECIAL LANDSBERG CURVATURE
2
2
In this paper, we study a class of Finsler metrics which contains the class of Preducible andgeneral relatively isotropic Landsberg metrics, as special cases. We prove that on a compact Finsler manifold,this class of metrics is nothing other than Randers metrics. Finally, we study this class of Finsler metrics withscalar flag curvature and find a condition under which these metrics reduce to Randers metric.
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241
248


A.
TAYEBI
Department of Mathematics and Computer Science, Qom University, Qom, I. R. of Iran
Department of Mathematics and Computer Science,
Iran
akbar.tayebi@gmail.com


E.
PEYGHAN
Department of Mathematics and Computer Science, Arak University, Arak, I. R. of Iran
Department of Mathematics and Computer Science,
Iran
epeyghan@araku.ac.ir,
Randers metric
flag curvature
Landsberg metric
Preducible
COMMON FIXED POINTS OF TWO NONEXPANSIVE MAPPINGS BY A NEW ONESTEP ITERATION PROCESS
2
2
We introduce a new onestep iteration process to approximate common fixed points of twononexpansive mappings in Banach spaces and prove weak convergence of the iterative sequence using (i)Opial’s condition and (ii) KadecKlee property. Strong convergence theorems are also established in Banachspaces and uniformly convex Banach spaces under the socalled Condition ( A ), which is weaker thancompactness.
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249
257


S. H.
KHAN
Department of Mathematics, Statistics and Physics, Qatar University, Doha 2713, Qatar
Department of Mathematics, Statistics and
Qatar
safeer@qu.edu.qa & safeerhussain5@yahoo.com


M.
ABBAS
Department of Mathematics, Lahore University of Management
Sciences, 54792, Lahore, Pakistan
Department of Mathematics, Lahore University
Pakistan


A. R.
KHAN
King Fahd University of Petroleum and Minerals, Department of Mathematics and Statistics,
Dhahran 31261, Saudi Arabia
King Fahd University of Petroleum and Minerals,
Saudi Arabia
Onestep Iteration Process
nonexpansive mapping
common fixed point
condition (A) weak and strong convergence
DESIGN AND CONSTRUCTION OF AN ACCURATE TIMING SINGLE CHANNEL ANALYZER
2
2
In this paper we discuss an approach to the design and construction of an accurate timing singlechannel analyzer (TSCA) for the timing of pulses over a wide dynamic range. A brief overview of the timingmethods and uncertainty factors as "walk and jitter" and a detailed description of the TSCA circuit are giventogether with some insight into the application and reasons that led us to the design and construction ofconstructed TSCA. The advantages of this instrument are then highlighted and the experimental results arepresented.
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259
267


A.
EZZATPANAH LATIFI
Radiation Application Group, Faculty of Nuclear Engineering,
Shahid Beheshti University, Tehran, I. R. of Iran
Radiation Application Group, Faculty of Nuclear
Iran


F.
ABBASI DAVANI
Radiation Application Group, Faculty of Nuclear Engineering,
Shahid Beheshti University, Tehran, I. R. of Iran
Radiation Application Group, Faculty of Nuclear
Iran
fabbasi@sbu.ac.ir


M.
SHAHRIARI
Radiation Application Group, Faculty of Nuclear Engineering,
Shahid Beheshti University, Tehran, I. R. of Iran
Radiation Application Group, Faculty of Nuclear
Iran


A.
SHARGHI IDO
Incubator Center of Technology Units of Shahid Beheshti University
P.O. Box: 1983963113, Tehran, I. R. of Iran
Incubator Center of Technology Units of Shahid
Iran
Timing Single Channel Analyzer (TSCA)
Constant Fraction Trailing Edge (CFTE)
Lower Level Discriminator (LLD)
Upper Level Discriminator (ULD)
ANALYSIS AND OPTIMIZATION OF A FISSION CHAMBER DETECTOR USING MCNP4C AND SRIM MONTE CARLO CODES
2
2
In this study, a general theoretical model to foresee and calculate the currentvoltagecharacteristics 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 electronion pair and GEANT4 for gamma sensitivity calculations were used.
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269
276


K.
HADAD
School of Mechanical Engineering, Shiraz University, Shiraz, I. R. of Iran
School of Mechanical Engineering, Shiraz
Iran
hadadk@shirazu.ac.ir


M.
HASHEMI
Islamic Azad University, Science and Research Division, Tehran, I. R. of Iran
Islamic Azad University, Science and Research
Iran
Fission chamber
MCNP
GEANT4
SRIM
Optimization
STUDY OF NEUTRON YIELD FOR THE 241Am9Be SOURCE
2
2
Beryllium chemical combination has a considerable effect on the design and fabrication of the241Am9Be neutron source. In this investigation the beryllium combinations were studied as a generator ofneutrons with various mass percentage, and the neutron yields were also calculated using the results of theALICE and SRIM codes calculations per unit incident charge. The neutron yields of Beryllium Hydride,Beryllium Carbide, Beryllium Hydroxide, Beryllium Oxide, Beryllium Acetate, Beryllium Acetylacetonateand 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.
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277
280


T.
KAKAVAND
Physics Department, Zanjan University, Zanjan, I. R. of Iran
Physics Department, Zanjan University, Zanjan,
Iran


M.
HAJISHAFEIEHA
Islamic Azad university of Qazvin, Qazvin, I. R. of Iran
Islamic Azad university of Qazvin, Qazvin,
Iran
m_h_shafeieha@yahoo.com


H.
GHAFOURIAN
Atomic Energy Organization of Iran, Tehran, I. R. of Iran
Atomic Energy Organization of Iran, Tehran,
Iran
Neutron
Beryllium
Americium
ALICE Code
SRIM Code
Neutron Yield