805 research outputs found
Stomatal density in various Turkish grape cultivars
In this study the number of stomata per unit area and dimensions of the stomata were determined in 15 important Turkish grape cultivars which were 20 years old and grafted on Kober 5 BB rootstock. Number of stomata per mm(2) of area varied from 129 ± 18 to 254 ± 10, stomatal length ranged from 22.6 ± 2.6 µm to 28.3 ± 4.3 µm, and stomaml width from 13.6 ± 2.2 µm to 18.6 ± 3.2 µm among cultivars. The cultivars. having minimum and maximum number of stomata per unit area were Balbal and Pembe Gemre; Erenkoy Beyazi and Muskule had minimum and maximum stomata size, respectively. Correlations between the number of stomata per unit area and the stomatal length (r = 0.100), and width (r = 0.184), and between the stomatal length and width (r = 0.493) were not significant among cultivars. On the other hand, Balbal, Hafizali and Yapincak were found to be more tolerant than the other cultivars. The characteristics of the cultivars in relation to their drought tolerance and stomatal densities were discusse
Higher Twist Effects in Photon-Photon Collisions
In this article, we investigate the contribution of the high twist Feynman
diagrams to the large single pseudoscalar and vector mesons inclusive
production cross section in two-photon collisions and we present the general
formulae for the high and leading twist differential cross sections. The pion
wave function where two non-trivial Gegenbauer coefficients and
have been extracted from the CLEO data, Braun-Filyanov pion wave function, the
asymptotic and the Chernyak-Zhitnitsky wave functions are used in the
calculations. For -meson we used Ball-Braun wave function. The results of
all the calculations reveal that the high twist cross sections, the ratio R,
the dependence transverse momentum and the rapidity of meson in
wave function case is very close to the
asymptotic wave function case. It is shown that the high twist contribution to
the cross section depends on the choice of the meson wave functions.Comment: REVTEX4, 23 pages, 7 figure
The Energy Eigenvalues of the Two Dimensional Hydrogen Atom in a Magnetic Field
In this paper, the energy eigenvalues of the two dimensional hydrogen atom
are presented for the arbitrary Larmor frequencies by using the asymptotic
iteration method. We first show the energy eigenvalues for the no magnetic
field case analytically, and then we obtain the energy eigenvalues for the
strong and weak magnetic field cases within an iterative approach for
and states for several different arbitrary Larmor frequencies. The
effect of the magnetic field on the energy eigenvalues is determined precisely.
The results are in excellent agreement with the findings of the other methods
and our method works for the cases where the others fail.Comment: 13 pages and 5 table
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Query Extension Suggestions for Visual Query Systems Through Ontology Projection and Indexing
Ontology-based visual query formulation is a viable alternative to textual query editors in the Semantic Web domain for extracting data from structured data sources in terms of the skills and knowledge required. A visual query system is at any moment responsible for providing the user with query extension suggestions; however, suggestions leading to empty results are often not useful. To this end, in this article, we first present an approach for projecting OWL 2 ontologies into navigation graphs to be used for query formulation and then a solution where an efficient finite index is used to calculate non-ranked approximated extension suggestions for ontology-based visual query systems using navigation graphs. The results of our experiments suggest that one can efficiently project an ontology into a navigation graph, query it for running an interactive user interface, and suggest query extensions that do not lead to dead-ends
Higher Twist Effects in Proton-Proton Collisions
In this article, we investigate the contribution of the high twist Feynman
diagrams to the large- pion production cross section in proton-proton
collisions and we present the general formulae for the high and leading twist
differential cross sections. The pion wave function where two non-trivial
Gegenbauer coefficients and have been extracted from the CLEO data,
two other pion model wave functions, , , the asymptotic and the
Chernyak-Zhitnitsky wave functions are used in the calculations. The results of
all the calculations reveal that the high twist cross sections, the ratios ,
, the dependence transverse momentum and the rapidity of pion in
the wave function case is very close to the
asymptotic wave function case. It is shown that the high twist
contribution to the cross section depends on the choice of the meson wave
functions.Comment: 28 pages 18 figures RevTex
Investigation of the nuetralino pair production at LHC
In this article, we investigate the Drell-Yan process of the light neutralino
pair () productions
at proton-proton collisions and we present the general formulate for the
differential cross sections. We conduct an extensive examination of the
dependence of the total cross section of the subprocesses on the beam energy, on the mass
of the squarks and also on the gaugino for the three extremely different
scenarios. For all three cases, the outcomes are as follows. The dependence of
the total cross section of the subprocesses on the beam energy is dominated by one of
the subprocesses, . On the other hand, the dependence of the total cross section of
the subprocesses
on the mass of the squarks is dominated by one of the subprocesses, . We derive there from that
our findings may lead to new insights relating to experimental investigations
and these dependencies may be used as bases of an experimental research for the
neutralino pair at LHC.Comment: 38pp, 22 figures, ReVTeX4, (Baku State University, Azerbaijan, and
Erciyes University, Kayseri, Turkey
KINETIC AND KINEMATIC ANALYSIS OF RECURVE ARCHERY SHOOTING TECHNIQUE
The study investigated shooting techniques of the archers with kinetic and kinematic methods. Twenty-seven archers of different skill levels have been involved into the current study to investigate both muscular activation strategies of nine muscles and some kinematic data on drawing hand side. A statistical significant difference (p0.05) in the time-dependent exchange values of the angle of the joints, a difference was detected in the graphical sense. Elite archers use distal muscles less but proximal and axial muscles more, and mid-level and novice archers use distal muscles more to pull the bowstring. This was interpreted to be the most important factor affecting the horizontal oscillation (lateral diflection) of bowstring
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