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Issa Yavari Ako Mokhtarporyani-Sanandaj Loghman Moradi Anvar Mirzaei 《Tetrahedron》2008,64(22):5221-5225
The 1:1 intermediate generated by the addition of alkyl(aryl) isocyanides to dimethyl acetylenedicarboxylate is trapped by benzoyl chloride to yield functionalized 2,5-dihydro-1H-pyrroles. The presence of electron-withdrawing groups at the para position of benzoyl chloride leads to tetrasubstituted furans. The structures of these products were confirmed by single-crystal X-ray diffraction studies. 相似文献
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Bicuspid aortic valve (BAV) is a congenital heart defect that has been associated with serious aortopathies, such as aortic stenosis, aortic regurgitation, infective endocarditis, aortic dissection, calcific aortic valve and dilatation of ascending aorta. There are two main hypotheses to explain the increase prevalence of aortopathies in patients with BAV: the genetic and the hemodynamic. In this study, we seek to investigate the possible role of hemodynamic factors as causes of BAV-associated aortopathy. We employ the curvilinear immersed boundary method coupled with an efficient thin-shell finite-element formulation for tissues to carry out fluid–structure interaction simulations of a healthy trileaflet aortic valve (TAV) and a BAV placed in the same anatomic aorta. The computed results reveal major differences between the TAV and BAV flow patterns. These include: the dynamics of the aortic valve vortex ring formation and break up; the large-scale flow patterns in the ascending aorta; the shear stress magnitude, directions, and dynamics on the heart valve surfaces. The computed results are in qualitative agreement with in vivo magnetic resonance imaging data and suggest that the linkages between BAV aortopathy and hemodynamics deserve further investigation. 相似文献
4.
Issa Yavari Nargess Hosseini Loghman Moradi Anvar Mirzaei 《Tetrahedron letters》2008,49(27):4239-4241
A mild, convenient, and practical one-pot procedure for direct synthesis of N,N′-dialkyl-N″-dialkylaminocarbothioyl thioureas is described via three-component reaction of cyclic secondary amines, CS2, and N,N′-dialkyl carbodiimides in water at room temperature. 相似文献
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We propose a construction of string cohomology spaces for Calabi-Yau hypersurfaces that arise in Batyrev's mirror symmetry construction. The spaces are defined explicitly in terms of the corresponding reflexive polyhedra in a mirror-symmetric manner. We draw connections with other approaches to the string cohomology, in particular with the work of Chen and Ruan. 相似文献
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In this work subtleties of application of BET isotherm for liquid phase adsorption is presented. It has been shown that direct
use of the classical BET equation (which was developed for gas phase adsorption) to liquid phase adsorption leads to ambiguous
and erroneous results. Some cases of misuse of BET equation for liquid phase adsorption have been revisited. By close examination
of the development of the classical equation, the causes of misunderstandings were elucidated and the suitable form of the
BET equation for liquid phase adsorption was developed. As case studies, the classical form of the BET equation along with
the correct form of the equation for liquid phase have been applied for modeling liquid phase adsorption of methyl tert-butyl
ether (MTBE) on perfluorooctyl alumina, phenol on activated carbon and pentachlorophenol on carbonized bark. It has been shown
that direct application of the classical BET isotherm to liquid phase adsorption results in poor and erroneous estimation
of the equation parameters. For example, in aqueous phase adsorption of MTBE on perfluorooctyl alumina, the monolayer adsorption
capacity of the adsorbent was calculated as 9.7 mg/g instead of 3.3 mg/g or the saturation concentration of MTBE in water
was calculated as 1212 mg/L instead of 42000 mg/L. 相似文献
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Issa Yavari Anvar Mirzaei Loghman Moradi Gholamhossein Khalili 《Tetrahedron letters》2010,51(2):396-6808
An effective route to spiro-functionalized fused polycyclic derivatives of isoquinoline is described via tandem reaction of isoquinoline, dialkyl acetylenedicarboxylates, and indane-1,3-dione. 相似文献
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The reaction of dialkyl acetylenedicarboxylates with alkyl 2‐[3‐oxo‐3,4‐dihydro‐2(1H)‐quinoxadinylidene]ethanoates in the presence of triphenylphosphine leads to trialkyl (E)‐3‐{3‐oxo‐2‐3,4‐dihydro‐2‐(1H)‐quinoxalinylidene}‐prop‐1‐ene‐1,2,3‐tricarboxylates in good yields. 相似文献
9.
Viktor V. Glagolev Gabriela Martinská Jan Mušinský Jozef Urbán Khosim Olimov Anvar A. Yuldashev 《Central European Journal of Physics》2011,9(6):1387-1392
Correlations between two protons emitted in dp and 16Op collisions at momenta 3.3 GeV/c and 52.6 GeV/c, respectively, are presented. The experimental data have been obtained using
the one metre hydrogen bubble chamber exposed to nuclear beams from the synchrophasotron, JINR, Dubna. Data show a clear interference
effect as expected for identical fermions. A Gaussian parametrization is used to determine the size of the proton emission
source. The root mean square radius of the proton source calculated from the correlation function has been found to be equal
to (2.10−0.35+0.43) fm and (2.67−0.38+0.54) fm for d and 16O respectively. It agrees with the known radii of these nuclei. 相似文献
10.
It is shown that the variety generated by a finite modular lattice has only finitely many locally finite covers.
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