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Search Results: 1 - 10 of 395 matches for " Gursevil Turan "
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The exclusive $B\to π\ell^+ \ell^-$ and $B\to ρ\ell^+ \ell^-$ decays in the general two Higgs doublet model
Guray Erkol,Gursevil Turan
Physics , 2002, DOI: 10.1088/1126-6708/2002/02/015
Abstract: We study the differential branching ratio, branching ratio and the forward-backward asymmetry for the exclusive $B \to \pi \ell^+ \ell^-$ and $B \to \rho \ell^+ \ell^-$ decays in the general two Higgs doublet model including the neutral Higgs boson effects. We analyze the dependencies of these quantities on the neutral Higgs boson contributions and the other model parameters. We observe that two Higgs doublet model with the neutral Higgs boson exchanges gives quite sizable contributions to these observables for both channels we consider. Since the neutral Higgs boson exchanges are the only source of the forward-backward asymmetry for $B \to \pi \tau^+ \tau^-$ decay, which is at the order of magnitude $1-10%$, measurement of this observable is promising to determine the neutral Higgs boson effects.
Radiative dileptonic decays of B-meson in the general two Higgs doublet model
Guray Erkol,Gursevil Turan
Physics , 2001,
Abstract: We investigate the exclusive $B\to \gamma \ell^+ \ell^- $ decay in the general two Higgs doublet model (model III) including the neutral Higgs boson effects with an emphasis on possible CP-violating effects. For this decay, we analyse the dependencies of the forward-backward asymmetry of the lepton pair, $A_{FB}$, CP-violating asymmetry, $A_{CP}$, and the CP-violating asymmetry in forward-backward asymmetry, $A_{CP}(A_{FB})$, on the model parameters and also on the neutral Higgs boson effects. We have found that $A_{FB}\sim 10^{-1}, 10^{-2}$, $A_{CP}\sim 10^{-2}, 10^{-1}$ and $A_{CP}(A_{FB}) \sim 10^{-2}, 10^{-1}$ depending on the relative magnitude of the Yukawa couplings $\bar{\xi}_{N,tt}^{U}$ and $\bar{\xi}_{N,bb}^{D}$ in the model III. We also observe that these physical quantities are sensitive to the model parameters and neutral Higgs boson effects are quite sizable for some values of the coupling $\bar{\xi}_{N,\tau \tau}^{D}$.
$B\to τ^+ τ^- γ$ decay in the general two Higgs doublet model including the neutral Higgs boson effects
Guray Erkol,Gursevil Turan
Physics , 2001, DOI: 10.1103/PhysRevD.65.094029
Abstract: We investigate the differential branching ratio, branching ratio, differential forward-backward asymmetry, the forward-backward asymmetry of the lepton pair and the lepton polarization asymmetry of the exclusive $B\to \tau^+ \tau^- \gamma$ decay in the general two Higgs doublet model including the neutral Higgs boson effects. We analyse the dependencies of these quantities on the model parameters and also on the neutral Higgs boson effects. We found that they get considerable enhancement from the two Higgs doublet model compared to the standard model and neutral Higgs boson effects are quite sizable.
Charm and Bottom Semileptonic Decays
Patrick J. O'Donnell,Gursevil Turan
Physics , 1996, DOI: 10.1103/PhysRevD.56.295
Abstract: We review the present status of theoretical attempts to calculate the semileptonic charm and bottom decays and then present a calculation of these decays in the light--front frame at the kinematic point $q^2=0$. This allows us to evaluate the form factors at the same value of $q^2$, even though the allowed kinematic ranges for charm and bottom decays are very different. Also, at this kinematic point the decay is given in terms of only one form factor $A_{0}(0)$. For the ratio of the decay rates given by the E653 collaboration we show that the determination of the ratio of the Cabibbo--Kobayashi--Maskawa (CKM) matrix elements is consistent with that obtained from the unitarity constraint. At present, though, the unitarity method still has greater accuracy. Since comparisons of the semileptonic decays into $\rho$ and either electrons or muons will be available soon from the E791 Fermilab experiment, we also look at the massive muon case. We show that for a range of $q^2$ the $SU(3)_F$ symmetry breaking is small even though the contributions of the various helicity amplitudes becomes more complicated. For $B$ decays, the decay $B \rightarrow K^{*} \ell \bar{\ell}$ at $q^2=0$ involves an extra form factor coming from the photon contribution and so is not amenable to the same kind of analysis, leaving only the decay $B \rightarrow K^{*}\nu \bar{\nu}$ as a possibility. As the mass of the decaying particle increases we note that the $SU(3)$ symmetry becomes badly broken at $q^2=0$.
What Is Exactly the Scope of Nuclear Chemistry and Its Educational Position between Other Chemistry Branches  [PDF]
Turan ünak
Advances in Chemical Engineering and Science (ACES) , 2017, DOI: 10.4236/aces.2017.71006
Abstract: The undergraduate chemistry programs of different universities across the world show clearly that nuclear chemistry education doesn’t have a permanent status in chemistry curricula like classical sub-branches of chemistry which means like organic, inorganic, analytical, physical, and biochemistry. Before starting the evaluation of the status of nuclear chemistry education, first of all, nuclear chemistry should correctly be defined and its position in chemistry education programs should correctly be determined. In addition, a confusion of terminology or at least, a terminological turbulence exists in this branch of chemistry about the use of terms such as nuclear chemistry, radiochemistry, nuclear and radiochemistry. Also, the scopes of the expressions used in this field such as radiochemistry, radiation chemistry, radiopharmaceutical chemistry, etc. should be exactly defined and the realtions between them should be clearly understood. Breifly, nuclear chemistry may be difined as a large umbrella which covers all chemical studies related to radioactive materials and nuclear radiation including the fine sub-branches such as radiochemistry, radiation chemistry, radioanalytical chemistry, radiopharmaceutical chemistry, environmental radiochemistry. If these are not done, the educational problems in nuclear chemistry could not be correctly investigated and the remedies could not be correctly determined.
Power System Analysis of an Aero-Engine  [PDF]
Onder Turan, Hakan Aydin
Journal of Power and Energy Engineering (JPEE) , 2015, DOI: 10.4236/jpee.2015.34060
Abstract:

The aim of this study is analyzed in detail for better understanding of energy and power of an aero-engine. In this regard, this study presents energy equations were applied to the turbofan engine components. The engine has a thrust range of 82 to 109 kN. It consists of fan, axial low pressure compressor (LPC), axial high pressure compressor (HPC), an annular combustion chamber, high-pressure turbine (HPT) and low pressure turbine (LPT). The results show that power of the engine flow approaches a maximum value to be 82.85 MW in the combustor outlet, while minimum power is observed at LPC inlet with the value of 1.37 MW. Furthermore, important parameters of the engine are also analyzed from reverse-engineering method. It is expected that results of this study will be beneficial of power, cogeneration and aero-propulsive generation systems in similar environment.

Antioxidant, Antimicrobial, Cytotoxic, Larvicidal and Anthelmintic Activities and Phenolic Contents of Cyclamen alpinum  [PDF]
Murat Turan, Ramazan Mammadov
Pharmacology & Pharmacy (PP) , 2018, DOI: 10.4236/pp.2018.94008
Abstract: In this study, antioxidant, cytotoxic, larvicidal, antimicrobial and anthelmintic effects and phenolic contents of ethanol, methanol and acetone extracts of leaf and tuber parts of Cyclamen alpinum were investigated. DPPH, ABTS, β-carotene assays were carried out in antioxidant activity and total phenolic and flavonoid contents were tested in determination assay. 9 phenolic contents were determined by HPLC. Artemia salina was used in the cytotoxic effect. Larvicidal effect was investigated against Culex pipiens. Disc diffusion method was used in antimicrobial effect. The tuber part was found to be more toxic than the leaf part in the anthelmintic activity assay. The highest value obtained from the antioxidant activity experiment was observed with value of 86.73 ± 0.16 (%) in DPPH assay. The lowest LC50 value in larvicidal effect was determined 0.151 mg/mL after 72 hours. Consequently, there is need for further studies on the Cyclamen alpinum, which has the ability to fight against diseases such as cancer, cardiovascular diseases, etc.
kinci Ergenekon //// 2th Ergenekon
?mer Turan
History Studies : International Journal of History , 2010,
Abstract:
iir: Kütüphane
Hasan Turan
Türk Kütüphanecili?i , 1974,
Abstract:
zlü, zenli, lkeli Bir Ki ilik: zer Soysal
?erafettin Turan
Türk Kütüphanecili?i , 1997,
Abstract:
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