排序方式: 共有109条查询结果,搜索用时 296 毫秒
31.
Mustafa OdabasÛoglu igdem Albayrak Orhan Büyükgüngr Helmut Goesmann 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(5):o234-o236
The title compound, C17H18ClN3O4, adopts the keto–amine tautomeric form and displays an intramolecular N—H⋯O hydrogen bond [N⋯O = 2.639 (2) Å]. The configuration around the azo N=N double bond is trans, and the dihedral angle between the planes of the two aromatic rings is 20.5 (2)°. The molecules are linked by O—H⋯O hydrogen bonds to form a three‐dimensional network. 相似文献
32.
Mustafa OdabasÛoglu igdem Albayrak Orhan Büyükgüngr Peter Lnnecke 《Acta Crystallographica. Section C, Structural Chemistry》2003,59(11):o616-o619
The title compounds, 2‐{[tris(hydroxymethyl)methyl]aminomethylene}cyclohexa‐3,5‐dien‐1(2H)‐one, C11H15NO4, (I), 6‐hydroxy‐2‐{[tris(hydroxymethyl)methyl]aminomethylene}cyclohexa‐3,5‐dien‐1(2H)‐one, C11H15NO5, (II), and 6‐methoxy‐2‐{[tris(hydroxymethyl)methyl]aminomethylene}cyclohexa‐3,5‐dien‐1(2H)‐one, C12H17NO5, (III), adopt the keto–amine tautomeric form, with the formal hydroxy H atom located on the N atom, and the NH group and oxo O atom display a strong intramolecular N—H⋯O hydrogen bond. The N—H⋯O hydrogen‐bonded rings are almost planar and coupled with the cyclohexadiene rings. The carbonyl O atoms accept two other H atoms from the alcohol groups of adjacent molecules in (I), and one from the alcohol and one from the phenol group in (II), but from only one alcohol H atom in (III). 相似文献
33.
The critical and compensation temperatures of the bilayer Bethe lattices with one of the layers having only spin-1/2 atoms
and the other having only spin-1 atoms placed symmetrically are studied by using exact recursion relations in a pairwise approach.
The Hamiltonian of the model consist of the bilinear intralayer coupling constants of the two layers J
1 and J
2 for the interactions of the atoms in layers with spin-1/2 and spin-1, respectively, and the bilinear interlayer coupling
constant J
3 between the adjacent atoms with spin-1/2 and spin-1 of the layers. After obtaining the ground state phase diagram with J
1 > 0, the variations of the order-parameters and the free energy are investigated to obtain the phase diagram of the model
by considering only the ferromagnetic ordering of the layers, i.e. J
1 > 0 and J
2 > 0, and ferromagnetic or antiferromagnetic ordering of the adjacent spins of the layers, J
3 > 0 or J
3 < 0, respectively. It was found that the system presents both second- and first-order phase transitions and, tricritical
points. The compensation temperatures was also observed for the appropriate values of the system parameters.
PACS: 05.50.+q 05.70.Fh 64.60.Cn 75.10.Hk 相似文献
34.
Hüseyin Yapici Nesrin Kayataş Bilge Albayrak Gamze Baştürk 《Heat and Mass Transfer》2005,41(6):519-534
This study considers numerical simulations of the combustions of hydrogen and various hydrocarbons with air, including 21% oxygen and 79% nitrogen, in a burner and the numerical solution of the local entropy generation rate due to the high temperature and velocity gradients in the combustion chamber. The combustion is simulated for the fuel mass flow rates providing the same heat transfer rate
to the combustion chamber in the each fuel case. The effects of
(only in the case of H2 fuel) and equivalence ratio () on the combustion and entropy generation rate are investigated for the different
(from 5,000 to 10,000 W) and s (from 0.5 to 1.0). The numerical calculation of combustion is performed individually for all cases with the help of the Fluent CFD code. Furthermore, a computer program has been developed to numerically calculate the volumetric entropy generation rate distributions and the other thermodynamic parameters by using the results of the calculations performed with the FLUENT code. The calculations bring out that the maximum reaction rates decrease with the increase of (or the decrease of ). The large positive and negative temperature gradients occur in the axial direction, nonetheless, the increase of significantly reduces them. The calculations bring out also that with the increase of from 0.5 to 1.0, the volumetric local entropy generation rates decrease about 4% and that the merit numbers increase about 16%. 相似文献
35.
36.
Meziane M Brash EJ Gilman R Jones MK Luo W Pentchev L Perdrisat CF Puckett AJ Punjabi V Wesselmann FR Ahmidouch A Albayrak I Aniol KA Arrington J Asaturyan A Ates O Baghdasaryan H Benmokhtar F Bertozzi W Bimbot L Bosted P Boeglin W Butuceanu C Carter P Chernenko S Christy E Commisso M Cornejo JC Covrig S Danagoulian S Daniel A Davidenko A Day D Dhamija S Dutta D Ent R Frullani S Fenker H Frlez E Garibaldi F Gaskell D Gilad S Goncharenko Y Hafidi K Hamilton D Higinbotham DW Hinton W Horn T Hu B 《Physical review letters》2011,106(13):132501
Intensive theoretical and experimental efforts over the past decade have aimed at explaining the discrepancy between data for the proton electric to magnetic form factor ratio, G(E)/G(M), obtained separately from cross section and polarization transfer measurements. One possible explanation for this difference is a two-photon-exchange contribution. In an effort to search for effects beyond the one-photon-exchange or Born approximation, we report measurements of polarization transfer observables in the elastic H(e[over →],e(')p[over →]) reaction for three different beam energies at a Q(2)=2.5 GeV(2), spanning a wide range of the kinematic parameter ε. The ratio R, which equals μ(p)G(E)/G(M) in the Born approximation, is found to be independent of ε at the 1.5% level. The ε dependence of the longitudinal polarization transfer component P(?) shows an enhancement of (2.3±0.6)% relative to the Born approximation at large ε. 相似文献
37.
Erhan Albayrak 《中国物理快报》2011,28(2):43-46
The negativity (N) as a measure of thermal entanglement (TE) is studied for a two-qutrit spin-1 anisotropic Heisenberg XXZ chain with Dzyaloshinskii-Moriya (DM)... 相似文献
38.
Simple high‐performance liquid chromatography method for formaldehyde determination in human tissue through derivatization with 2,4‐dinitrophenylhydrazine
下载免费PDF全文
![点击此处可从《Journal of separation science》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Bilal Yilmaz Ali Asci Kaan Kucukoglu Mevlut Albayrak 《Journal of separation science》2016,39(15):2963-2969
A simple high‐performance liquid chromatography method has been developed for the determination of formaldehyde in human tissue. FA Formaldehyde was derivatized with 2,4‐dinitrophenylhydrazine. It was extracted from human tissue with ethyl acetate by liquid–liquid extraction and analyzed by high‐performance liquid chromatography. The calibration curve was linear in the concentration range of 5.0–200 μg/mL. Intra‐ and interday precision values for formaldehyde in tissue were <6.9%, and accuracy (relative error) was better than 6.5%. The extraction recoveries of formaldehyde from human tissue were between 88 and 98%. The limits of detection and quantification of formaldehyde were 1.5 and 5.0 μg/mL, respectively. Also, this assay was applied to liver samples taken from a biopsy material. 相似文献
39.
40.
Spin-1 Blume-Capel model with longitudinal random crystal and transverse magnetic fields:A mean-field approach
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Erhan Albayrak 《中国物理 B》2013,(7):494-498
The spin-1 Blume-Capel model with transverse and longitudinal external magnetic fields h, in addition to a longitudinal random crystal field D, is studied in the mean-field approximation. It is assumed that the crystal field is either turned on with probability p or turned off with probability 1 p on the sites of a square lattice. Phase diagrams are then calculated on the reduced temperature crystal field planes for given values of γ=Ω/J and p at zero h. Thus, the effect of changing γ and p are illustrated on the phase diagrams in great detail and interesting results are observed. 相似文献