2018-05-25T15:15:47Z
http://ijsts.shirazu.ac.ir/?_action=export&rf=summon&issue=451
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Subdıvısıons of the spectra for cesaro, rhaly and weighted mean operators on c0 ,c and ℓp
R. Kh.
Amirov
N.
Durna
M.
Yildirim
There are many different ways to subdivide the spectrum of a bounded linear operator; some of them aremotivated by applications to physics (in particular, quantum mechanics). In this study, the relationship betweenthe subdivisions of spectrum which are not required to be disjoint and Goldberg's classification are given.Moreover, these subdivisions for some summability methods are studied.
Spectrum
fine spectrum
approximate point spectrum
defect spectrum
compression spectrum
weighted mean operators
Rhaly operators
Cesáro operators
2011
09
16
175
183
http://ijsts.shirazu.ac.ir/article_2140_19461ed8a7a9811825fdac2d5d4a7ba2.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Analytical and numerical solutions of different parabolic heat equations presented in the form of multi-term fractional differential equations
M.
Kazemi
G. H.
Erjaee
In this article, we study the analytical solutions of different parabolic heat equations with different boundaryconditions in the form of multi-term fractional differential equations. Then we compare these analytical solutions with numerical finite difference methods. This comparison demonstrates the accuracy of the analytical and numerical methods presented here.
Parabolic heat equations
fractional differential equations
finite difference methods
2011
09
16
185
192
http://ijsts.shirazu.ac.ir/article_2141_990b386d1a2bdf51fd3ed9df07970d47.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
On the Goursat problem for a linear partial differential equation
A.
Maher
Ye. A.
Utkina
In this paper, the Goursat problem of a general form for a linear partial differential equation is investigated with the help of the Riemann function method. Some results are given concerning the existence and uniqueness for the solution of the suggested problem.
General form partial differential equation
goursat problem
Riemann function
2011
09
16
193
199
http://ijsts.shirazu.ac.ir/article_2142_fa8e1a49e0ff6f117cb18ebc80686e1b.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
New scheme of nuclide and nuclear binding energy from quark-like model
N.
Ghahramany
Sh.
Gharaati
M.
Ghanaatian
H.
Hora
Following our previous presentation of a new three-fold symmetry for derivation of the magic numbers of nuclei based upon a quark state model of nuclei, here the nuclear binding energy is obtained from such new perspective. From this point of view, since each nucleon is made of three quarks, the binding energy of nuclei contains a volume term proportional to 3A (A is mass number). By considering the asymmetry in the number of up and down quarks and also coulomb correction, a new formula is presented that calculates the nuclear binding energy in terms of only $ and Z numbers for most of the stable nuclides.PACS: 21.10.Dr, 21.90.+90, 21.10.-K, 12.38.Mh, 12.90.+b
Nuclear binding energy
Quark model
nuclear structure
2011
09
16
201
208
http://ijsts.shirazu.ac.ir/article_2143_7742fce0a4f2102b4acd6f3ca8559585.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Common fixed points of jointly asymptotically nonexpansive mappings
M.
Abbas
H.
Khan
A definition of two jointly asymptotically nonexpansive mappings S and T on uniformly convex Banach space E is studied to approximate common fixed points of two such mappings through weak and strong convergence of an Ishikawa type iteration scheme generated by S and T on a bounded closed and convex subset of E. As a consequence of the notion of two jointly asymptotically nonexpansive maps, we can relax the very commonly used strong condition “F(S) and F(T) has a nonempty intersection” with the weaker assumption “either F(S) is nonempty or F(T) is nonempty”. Our convergence results are refinements and generalizations of several recent results from the current literature
Jointly asymptotically nonexpansive mapping
common fixed point
weak and strong convergence
iteration scheme
Condition (A*)
2011
09
16
209
216
http://ijsts.shirazu.ac.ir/article_2144_0993a30e777482d60b47b9c699b47f6a.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Atom-Photon Thermal Entanglement in Nonlinear Jaynes-Cummings Models
A.
Keshavarz
M. M.
Golshan
In this work we investigate the thermal entanglement between two-level atoms and photons in a nonlinear cavity. We consider intensity-dependent couplings and calculate the negativity, as a measure of atom-photonentanglement. The cavity is assumed to be at a temperature T, so that all number of photons, and at the same time, both atomic states, with definite probabilities, are present. We then demonstrate a condition under which the intensity-dependent coupling leads to entanglement. It is also shown that, as in the case of linear Jaynes- Cummings model, the thermal states of atoms and photons are never separable.
Thermal entanglement
atom-photon
nonlinear Jaynes-Cummings
2011
09
16
217
222
http://ijsts.shirazu.ac.ir/article_2145_23f4a1b04ffa80c9e5a9e36cbe6e2175.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Function spaces on tensor product of semigroups
H.
Rahimi
In this paper, we characterize the function space and -space of the [topological] tensor product of [topological]semigroups. As a consequence, for arbitrary [topological] groups and , it will be shown that is anextension of by a proper normal subgroup N i,e. .
topological semigroup
compactification
tensor product
2011
09
16
223
228
http://ijsts.shirazu.ac.ir/article_2146_fd1c86c7c654abae17772cd7ea9c1636.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Evolutionary analysis of genes involved in cement gland development in anurans
M.
Nokhbatolfoghahai
P.
Tsimbouri
J. B.
Wilson
J. R.
Downie
The cement gland (CG) is a transient organ, found in most anuran embryos and early larvae and located normally on the front of the head. Its sticky secretion allows newly hatched larvae to attach to the egg jelly or to another support later and remain hidden and stationary until feeding starts. Our ultrastructural studies showed that prominence structure of the CG in some species exists, but is lacking in some others. Previous work has shown that a large number of genes have a role in CG development in Xenopus laevis. The aim of the present study is to find out whether the loss of cement gland formation for those species studied here occurs because of missing genes or for other reasons.In order to test whether some of these genes are present in other anuran species, especially in those where the CG does not form, genomic DNAs were examined for sequence similarity by low stringency hybridization. Sequences from three different genes with a role in controlling CG development in Xenopus (otx-2, xcg-1 and xag-1) were individually hybridised with genomic DNA of four species of anurans (X. laevies, Leptodactylus fuscus, Phyllomedusa trinitatis and Physalaemus pustulosus) and one species of rodent (Muss musculus domesticus strain C57Bl/ 6). The results showed that Xenopus probes can detect the presence of potential homologues of all three genes in the different species. For the two genes most specifically involved in CG development, xcg-1 and xag-1, both are clearly present, even in the two species which lack CG development, though in one of these, P. trinitatis, xag-1 shows considerable difference from the other species. At this stage, we can conclude that the missing cement gland for those species studied here is not due to a lack of the genes responsible for the gland development.In order to carry this work further, in situ hybridisation should be used to determine the actual expression patterns of these genes.
Cement gland
gene controlling
evolution, amphibian
transient organ
morphogenesis
2011
09
16
229
234
http://ijsts.shirazu.ac.ir/article_2147_e8e3f6e1ff6d1b8d4d1f67cbba0a4a56.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Green and efficient synthesis of azo Schiff bases
M.
Zarei
A.
Jarrahpour
Pure azo Schiff bases were readily and conveniently accessible in high yields by mixing of the reagents either as aqueous slurry, or by grinding at room temperature. This method, unlike a classical method, needs neither harsh conditions nor organic solvents. The satisfactory results were obtained with excellent yields, short reaction time, and operational simplicity in the experimental procedure. Comparison of time and yield in this green method with the classical methods is also performed.
Azo Schiff bases
imines
Solvent-free
Green chemistry
grinding
2011
09
16
235
242
http://ijsts.shirazu.ac.ir/article_2148_ece97e26ba880852b5c28c83bdeefbd3.pdf
Iranian Journal of Science and Technology (Sciences)
Transaction A: Science
1028-6276
1028-6276
2011
35
3
Foliar anatomy of the genus Potentilla L. (ROSACEAE) in Iran and its taxonomic implication
M. B.
Faghir
F.
Attar
B.
Ertter
Leaf anatomy of 27 species of Potentilla L. (Rosaceae), representing 9 sections and four related genera, especially Tylosperma Botsch., Schistophyllidium (Juz. ex Fed.) Ikonn., Drymocallis Fourr. ex Rydb., and Sibbaldia L. from Iran were studied using light microscopy. The most outstanding characters of blade and midrib were measured. The result revealed a number of taxonomically important characters e.g., trichome types, stomata positions, mesophyll types, crystals location and vascular bundle shape. Three types of stomata, two main types of mesophyll and two main types of vascular bundles were identified. Leaf anatomical evidence is of taxonomic value and reflect the ecological differences in the studied species.
leaf anatomy
Potentilla L
Rosaceae
Iran
2011
09
16
243
256
http://ijsts.shirazu.ac.ir/article_2149_cf626b4faec67618b8c41f8f03007f5a.pdf