2005
29
3
3
0
HYPERRULED SURFACES IN MINKOWSKI 4SPACE
2
2
In this paper, the timelike hyperruled surfaces in the Minkowski 4space and their algebraicinvariants are worked. Also some characteristic results are found about these algebraic invariants.
1

341
347


R.
ASLANER
Department of Mathematics, Inönü University, 44280 Malatya, Turkey
Department of Mathematics, Inönü
Turkey
ruled surfaces
rulings
main curvature
scalar curvature
timelike vector
ANGULAR DEPENDENT MAGNETORESISTANCE OSCILLATION IN STAGE2 IBr GRAPHITE INTERCALATION COMPOUND
2
2
The angular dependent magnetoresistance oscillation (ADMRO) of the stage2 IBr graphiteintercalation compound (GIC) was studied between 1.8 K and 110 K in magnetic fields between 1 and 9T. There was a series of peaks in the caxis resistance as the field direction was changed from the c axisto the (001) plane. The field independence of the angular positions of the peaks, showing that theoscillation is not from the Shubnikovde Haas effect, and the presence of the oscillation at hightemperatures indicate that the effect is semiclassic. The location and the relative amplitudes of the peaksshow that the ADMRO in this compound does not follow the predictions for the symmetrical corrugationmodel of the cylindrical Fermi surface. The reason is attributed to the presence of two cylindrical Fermisurfaces and zone folding of the Fermi surface by the periodicity of the IBr lattice in this compound.
1

349
356


M.
BARATI
Department of Physics, Shiraz University, Shiraz, I. R. of Iran 71454
Department of Physics, Shiraz University,
Iran


P. K.
UMMAT
Department of Physics and Astronomy, McMaster University, Hamilton, ON, L8S 4M1, Canada
Department of Physics and Astronomy, McMaster
Canada


G.
LUKE
Department of Physics and Astronomy, McMaster University, Hamilton, ON, L8S 4M1, Canada
Department of Physics and Astronomy, McMaster
Iran


W. R.
DATARS
Department of Physics and Astronomy, McMaster University, Hamilton, ON, L8S 4M1, Canada
Department of Physics and Astronomy, McMaster
Canada
Graphite intercalation compound
ADMRO effect
ON GENERAL RELATIVELY ISOTROPIC LCURVATURE FINSLER METRICS
2
2
In this paper the general relatively isotropic L curvature Finsler metrics are studied. It isshown that on constant relatively Landsberg spaces, the concepts of weakly Landsbergian, Landsbergianand generalized Landsbergian metrics are equivalent. Some necessary conditions for a relativelyisotropic L curvature Finsler metric to be a Riemannian metric are also found.
1

357
366


B.
NAJAFI
Department of Mathematics and Computer Science
of AmirKabir University, Tehran, I. R. of Iran
Department of Mathematics and Computer Science
of
Iran


A.
TAYEBI
Department of Mathematics and Computer Science
of AmirKabir University, Tehran, I. R. of Iran
Department of Mathematics and Computer Science
of
Iran


M. M.
REZAII
Department of Mathematics and Computer Science
of AmirKabir University, Tehran, I. R. of Iran
Department of Mathematics and Computer Science
of
Iran
Finsler metric
(generalized) Landsberg metric
(mean) landsberg curavture
(mean) Cartan tensor
Douglas tensor
Funk metric
Randers metric
ELECTRON ACCELERATION AND EXCITATION PROCESSES IN THE VICINITY OF A MERCURY DISCHARGE CONSTRICTION
2
2
In the present paper axial distributions of plasma and floating potentials, electron and iondensities and EEDF have been measured in the DL region of a Hg discharge constriction. An attempt hasbeen made for the resolution of opposing charged layer structures in DL. Excitation processes in theconstriction region are studied. Using the linearization method for the nonstationary balance equationssystem and choosing appropriate discharge conditions, the step excitation rate by the electron impact for6 3 P 2 →7 1 S 0 transition in Hg is determined.
1

367
375


S.
FAZLIAN
1Faculty of Physics, University of Tabriz, Tabriz, I. R. of Iran,
1Faculty of Physics, University of Tabriz,
Iran


S.
SOBHANIAN
Faculty of Physics, University of Tabriz, Tabriz, I. R. of Iran
Faculty of Physics, University of Tabriz,
Iran


A.
MURADOV
Physics Dept., Baku State University, Baku, Azerbaijan
Physics Dept., Baku State University, Baku,
Azerbaijan
Double layers (DL)
EEDF
plasma parameters
excitation processes
constriction edge
excitation rates
modulation depths
spectral lines
INFORMATION MATRIX FOR A MIXTURE OF TWO PARETO DISTRIBUTIONS
2
2
The Fisher information matrix for a mixture of two Pareto distributions is derived. Numericaltabulations of the matrix are also provided for practical purposes. The work is motivated by a reallifeexample.
1

377
385


S.
NADARAJAH
1Department of Statistics, University of Nebraska, Lincoln, NE, USA, 68583
1Department of Statistics, University of
Iran


S.
KOTZ
Department of Engineering Management and Systems Engineering,
George Washington University, Washington, D. C. USA, 20052
Department of Engineering Management and
United States
Lerch function
pareto distribution
EFFECT OF MONITORING TIME INTERVAL ON THE RESULTS OF STOCHASTIC ANALYSIS OF KARST WATER RESOURCES
2
2
Data monitoring is important in the study and analysis of hydrological behaviors of karsticsystems. Monitoring shows the various regimes of groundwater flow (laminar or turbulent), depletion,filling, filtration and karstification degree of karst aquifers. In recent years, analyses of these data hadconsiderable advances using stochastic time series analyses. An important problem related to theseanalyses is the constraint of financial and technical human support. If we can increase the time intervals,the costs are lowered and development of new monitoring networks will be possible. In this research, theeffect of monitoring time intervals on the results of time series analysis and calculated hydrologic delaytimes are studied, using bivariate analyses in spectral domain. The first (shorter) and the second (longer)delay times are related to the flow of groundwater through the larger and smaller fractures of the karsticsystem, respectively. Daily groundwater level data of three piezometers and the discharge of a spring inthe Maharlu karst basin in Iran (5212′ to 5328′E and 291′ to 306′N ) were acquired and then sixdifferent time series having different time intervals (1, 3, 7, 10, 14 and 30 days) were extracted andanalyzed. The results show that the variation of the computed stochastic parameters with increasing timeintervals is unpredictable, but the variation of time (period) corresponding to the frequency at the peak ofamplitude function (curve) shows a linear and predictable relationship, which is unique for every kind ofkarstic aquifer having different degrees of karstification.
1

387
399


M.
ZARE
Department of Geology, Shiraz University, I. R. of Iran
2Department of Statistics, Shiraz University, I. R. of Iran
Department of Geology, Shiraz University,
Iran


A. R.
NEMATOLLAHI
Department of Statistics, Shiraz University, I. R. of Iran
Department of Statistics, Shiraz University,
Iran


M.
RAHNEMAEI
Department of Irrigation, Shiraz Islamic Azad University, I. R. of Iran
Department of Irrigation, Shiraz Islamic
Iran
Karst
Time series
squared coherency
phase
amplitude
delay time
A NEW METHOD FOR ELECTRIC FIELD OPTIMIZATION IN HIGH POWER LASER MULTILAYERS
2
2
Spatial distribution of electric field amplitude has an essential role in laserinduced damagemultilayer coating. A new method introduced in this paper to reduce the electric field intensityeffectively within the high index layers in multilayer reflectors that are irradiated by high power lasers.The design is based on specific nonquarter wave pairs, assuming the number of layers is held constant.Using a combination of periodic and nonperiodic pairs of a nonquarter wave stack with an appropriatethickness for a specific angle of incidence, minimum electric field can be obtained within the high indexlayers for the S or P polarization. Different results can be obtained if the nonperiodic pairs are placedadjacent to the substrate, or to the ambient. We have shown that by the former design, a lower electricfield can be achieved within the layers and the mirror can be optimized. The optimization was carriedout for oblique incidence and the effect of angle of incidence was examined for both S and Ppolarizations.
1

401
410


M. H.
MAHDIEH
Department of Physics, Iran University of Science and Technology, Narmak, Tehran, I. R. of Iran
Department of Physics, Iran University of
Iran


M.
ALAVINEJAD
Department of Physics, Iran University of Science and Technology, Narmak, Tehran, I. R. of Iran
Department of Physics, Iran University of
Iran
Optical multilayers
high power laser mirrors
optical damage
electric field reduction
EXTREMAL ORDERS INSIDE SIMPLE ARTINIAN RINGS
2
2
The aim of this paper is to study orders over a valuation ring V with arbitrary rank in acentral simple Falgebra Q. The relation between all of the orders is explained with a diagram. It is thenshown that inside Bezout order, extremal Vorders are precisely semihereditary. In the last section, theeffect of Henselization on maximal and semihereditary orders is examined.
1

411
420


N. H.
HALIMI
84 Manburgh Tce, Darra, QLD 4076, Australia
84 Manburgh Tce, Darra, QLD 4076, Australia
Australia
Dubrovin valuation rings
extremal orders
Henselization
ON THE INVESTIGATION OF SPARK FORMATION CONDITIONS AND ENERGY GAIN IN INERTIAL CONFINEMENT FUSION
2
2
In isobaric models for inertial confinement fusion it is assumed that the target configurationat stagnation time (maximum compression) consists of two regions, hot spark and cold fuel, respectively.Here the conditions of spark formation and ignition in hydrogen equimolar isotopes in central sparkignition are investigated and permissible values of Hs and Ts are evaluated numerically. By introducing adimensionless parameter, ψs, the class of targets are considered by the specific value of ψs. Finally,limiting fuel energy gain curve (Gf*) as a function of ignition energy (Eign) allows different implosionvelocities to be calculated. This result is in good agreement with more complex hydrodynamic models.
1

421
431


A.
GHASEMIZAD
1Department of Physics, Faculty of Science, University of Guilan, Rasht, I. R. of Iran,
1Department of Physics, Faculty of Science,
Iran


M. R.
ESKANDARI
Department of Physics, Shiraz University, Shiraz, I. R. of Iran
Department of Physics, Shiraz University,
Iran


S.
KHOSHBINFAR
Department of Physics, Faculty of Science, University of Guilan, Rasht, I. R. of Iran
Department of Physics, Faculty of Science,
Iran


M.
KAMRAN
Department of Physics, Faculty of Science, University of Guilan, Rasht, I. R. of Iran
Department of Physics, Faculty of Science,
Iran
Central spark ignition
spark parameter
isobaric model
limiting gain curve
USING FUZZY KNOWLEDGE OF A NUISANCE PARAMETER FOR HYPOTHESIS TESTING
2
2
The problem of hypothesis testing with a nuisance parameter is considered. Two methods forusing fuzzy knowledge on the nuisance parameter to test hypotheses are suggested. These methods areneither a pure classical nor a pure Bayesian approach to hypothesis testing, but rather related to both. Afew known examples and their applications, which cannot be studied by the parametric statisticalmethods, are discussed.
1

433
454


J.
BEHBOODIAN
1Department of Mathematics, Shiraz Islamic Azad University, Shiraz, I. R. of Iran
1Department of Mathematics, Shiraz Islamic
Iran
behboodian@stat.susc.ac.ir,


A.
MOHAMMADPOUR
Department of Statistics, Faculty of Mathematics and Computer Science, Amirkabir University of Technology,
424 Hafez Ave., Tehran, I. R. of Iran, 15914
Department of Statistics, Faculty of Mathematics
Iran
Fuzzy Statistics
defuzzified distribution
weighted defuzzificationEstimator
exchangeable normal Distribution
ON THE INTEGRAL INVARIANTS OF KINEMATICALLY GENERATED RULED SURFACES
2
2
In this paper, the dual area vector of a closed dual spherical curve is kinematically generatedand the dual Steineer vector of a motion are extensively studied by the methods of differential geometry.Jacobi’s Theorems, known for real curves, are investigated for closed dual curves. The closed trajectorysurfaces generated by an oriented line are fixed in a moving rigid body in IR3 , in which the closed dualcurves from E. Study’s transference principle is studied. The integral invariants of these closed ruledsurfaces are calculated by means of the area vector. Moreover, some theorems, results and examples aregiven.
1

455
470


H. B.
KARADAG
Department of Mathematics, Faculty of Sciences and Arts, Inönü University,
44069 Malatya, Turkey
Department of Mathematics, Faculty of Sciences
Turkey


S.
KELES
Department of Mathematics, Faculty of Sciences and Arts, Inönü University,
44069 Malatya, Turkey
Department of Mathematics, Faculty of Sciences
Turkey
Mechanism
kinematics
area vectors
ruled surfaces
invariants and motions
AIR POLLUTION ASSESSMENT IN SHIRAZ BY PASSIVE SAMPLING TECHNIQUES
2
2
The air quality in Shiraz was assessed based on a oneweek passive sampling campaign.During the first week of the summer 2003, about 400 passive samplers were used in groups of two andthree, so that 187 sampling stations covered all of Shiraz. Pollutant gases including SO2, NO2 and BTX(benzene, toluene and xylene) were sampled by diffusive sampling tubes. Collected samples wereanalyzed and pollutant concentrations were determined by using ion chromatography, spectrophotometryand gas chromatography techniques. The result of the analysis shows that SO2 and NO2 concentrationsexceed national and international standards in the central and southern parts of Shiraz. Weekly averagedconcentrations of benzene, toluene and xylene at all sampling sites were 105, 206 and 123 μg/m3, whichexceed national and international standards.Based on the results, more than 15% of Shiraz's population (180,000 out of 1.2 million people)were exposed to high levels of NO2 during this survey period.
1

471
480


K.
HADAD
1Department of Nuclear Engineering, Shiraz University, Shiraz, I. R. of Iran, 71345
1Department of Nuclear Engineering, Shiraz
Iran
hadadk@shirazu.ac.ir


A.
SAFAVI
Department of Chemistry, Shiraz University, Shiraz, I. R. of Iran, 71454
Department of Chemistry, Shiraz University,
Iran


R.
TAHON
ETI Group Burgeap, 92772 Boulogne Billancourt Cedex, France
ETI Group Burgeap, 92772 Boulogne Billancourt
France
Urban air pollution
passive sampling
air quality
BTX concentration
TRANSFORMATION SEMIGROUPS AND EXACT SEQUENCES
2
2
This text carries out some ideas about exact and P− exact sequences of transformationsemigroups. Some theorems like the short five lemma (Lemma 1.3 and Lemma 2.3) are valid here as inexact sequences of R − modules.
1

481
495


F.
AYATOLLAH ZADEH SHIRAZI
Department of Mathematics, Faculty of Science, University of
Tehran, Enghelab Ave., Tehran, I. R. of Iran
Department of Mathematics, Faculty of Science,
Iran
a − minimal set
exact sequence
P− exact sequence
proximal relation
transformation semigroup
ON GENERAL RELATIVELY ISOTROPIC MEAN LANDSBERG METRICS
2
2
The general relatively isotropic mean Landsberg metrics contain the general relativelyisotropic Landsberg metrics. A class of Finsler metrics is given, in which the mentioned two conceptsare equivalent. In this paper, an interpretation of general relatively isotropic mean Landsberg metrics isfound by using Cconformal transformations. Some necessary conditions for a general relativelyisotropic mean Landsberg metric, as well as generalized Landsberg metric to be a Riemannian metric arealso found.
1

497
505


B.
NAJAFI
Department of Mathematics and Computer Science
of AmirKabir University, Tehran, I. R. of Iran
Department of Mathematics and Computer Science
of
Iran


A.
TAYEBI
Department of Mathematics and Computer Science
of AmirKabir University, Tehran, I. R. of Iran
Department of Mathematics and Computer Science
of
Iran


M. M.
REZAII
Department of Mathematics and Computer Science
of AmirKabir University, Tehran, I. R. of Iran
Department of Mathematics and Computer Science
of
Iran
Finsler structure
Cartan connection
(generalized) Landsberg metric
scalar curvature
C2like space
cconformal transformation
THE STRUCTURE OF (α,β)DERIVATIONS OF TRIANGULAR RINGS
2
2
Let R and S be reduced rings with identities whose idempotents are central, and let M be an(R, S)bimodule such that annr (M)=0. In this paper, we determine first the structure of automorphisms ofthe triangular ring, =SR MT0, and then, for all automorphisms α ,β of T we determine the structureof (α,β)derivations of T.
1

507
514


M. N.
GHOSSEIRI
Department of Mathematics, Kurdistan University
P. O. Box 416, Sanandaj, I. R. of Iran
Department of Mathematics, Kurdistan University
P.
Iran
Triangular ring
automorphism
(α
β ) derivation
INSTABILITY OF SOLUTIONS OF CERTAIN NONLINEAR VECTOR DIFFERENTIAL EQUATIONS OF ORDER SEVEN
2
2
Sufficient conditions are established under which the zero solution X = 0 of equation (2) isunstable.
1

515
521


C.
TUNC
1Department of Mathematics, Faculty of Sciences and Literature,
Yüzüncü Yil University, 65080, Van, Turkey
1Department of Mathematics, Faculty of Sciences
Turkey


E.
TUNC
Department of Mathematics, Faculty of Science and Literature,
Gaziosman Paşa University, 60080, Tokat, Turkey
Department of Mathematics, Faculty of Science
Turkey
Nonlinear differential equations
seventh order
instability
Lyapunov’s second (direct) method
ON THE MOMENTS OF LKD
2
2
The mean and variance of the Lagrangian Katz family of distribution (LKD), the basicLagrangian Katz distribution of Type I (LKDI) and Type II (LKDII) are provided in an easy method.The recurrence relation between the noncentral, central and factorial moments, and the recurrencerelation between moments and cumulants of LKD, LKDI and LKDII are given. The first fourcumulants of LKDI and LKDII are provided.
1

523
529


A
BAZARGANLARI
Department of Statistics, Shiraz University, Shiraz, I. R. of Iran
Department of Statistics, Shiraz University,
Iran
Lagrangian Katz Family of Distribution (LKD)
recurrence relations
central
noncentral and factorial moments
cumulants
CONFORMAL VECTOR FIELDS ON TANGENT BUNDLE OF A RIEMANNIAN MANIFOLD
2
2
Let M be an ndimensional Riemannian manifold and TM its tangent bundle. Theconformal and fiber preserving vector fields on TM have wellknown physical interpretations and havebeen studied by physicists and geometricians. Here we define a Riemannian or pseudoRiemannian liftmetric g on TM , which is in some senses more general than other lift metrics previously defined onTM , and seems to complete these works. Next we study the lift conformal vector fields on (TM,g) andprove among the others that, every complete lift conformal vector field on TM is homothetic, andmoreover, every horizontal or vertical lift conformal vector field on TM is a Killing vector.
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531
539


S.
HEDAYATIAN
Faculty of Mathematics, AmirKabir University of Technology, Hafez Ave. 15914, Tehran, I. R. of Iran
Faculty of Mathematics, AmirKabir University
Iran


B.
BIDABAD
Faculty of Mathematics, AmirKabir University of Technology, Hafez Ave. 15914, Tehran, I. R. of Iran
Faculty of Mathematics, AmirKabir University
Iran
Complete lift metric
Conformal
Homothetic
Killing and Fiberpreserving vector fields