805 research outputs found

    Stomatal density in various Turkish grape cultivars

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    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

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    In this article, we investigate the contribution of the high twist Feynman diagrams to the large pTp_{T} 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 a2a_2 and a4a_4 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 ρ\rho-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 pTp_{T} and the rapidity yy of meson in ΦCLEO(x,Q2)\Phi_{CLEO}(x,Q^2) wave function case is very close to the Φasy(x)\Phi_{asy}(x) 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

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    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 n=210n=2-10 and m=01m=0-1 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

    Higher Twist Effects in Proton-Proton Collisions

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    In this article, we investigate the contribution of the high twist Feynman diagrams to the large-pTp_T 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 a2a_2 and a4a_4 have been extracted from the CLEO data, two other pion model wave functions, P2P_2, P3P_3, 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 RR, rr, the dependence transverse momentum pTp_T and the rapidity yy of pion in the ΦCLEO(x,Q2)\Phi_{CLEO}(x,Q^2) wave function case is very close to the Φasy(x)\Phi_{asy}(x) 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

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    In this article, we investigate the Drell-Yan process of the light neutralino pair χ~i0χ~j0\widetilde{\chi}_{i}^{0}\widetilde{\chi}_{j}^{0} (i,j=1,2i,j=1,2) 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 qqˉχ~i0χ~j0q \bar q \to \widetilde \chi_{i}^{0}\widetilde\chi_{j}^{0} on the beam energy, on the mass of the squarks and also on the M2M_2 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 qqˉχ~i0χ~j0q \bar q \to \widetilde \chi_{i}^{0} \widetilde \chi_{j}^{0} on the beam energy is dominated by one of the subprocesses, qqˉχ~10χ~20q \bar q \to \widetilde \chi_{1}^{0} \widetilde \chi_{2}^{0}. On the other hand, the dependence of the total cross section of the subprocesses qqˉχ~i0χ~j0q \bar q \to \widetilde \chi_{i}^{0} \widetilde \chi_{j}^{0} on the mass of the squarks is dominated by one of the subprocesses, qqˉχ~10χ~20q \bar q \to \widetilde \chi_{1}^{0} \widetilde \chi_{2}^{0}. 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

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    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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