synthesis of some new monocyclic β-lactams containing a quaternary carbon center via a [2+2]cycloaddition reaction is described. the reaction of achiral diphenyl ketene with chiral aldimines derivedfrom chiral 2, 3, 4, 6-tetra-o-acetyl-β-d-galactopyranosylamine, 2, 3, 4, 6-tetra-o-acetyl-β-dglucopyranosylamine and different benzaldehydes resulted in the formation of β-lactams as singlediastereo...

A nonlocal boundary value problem for the fractional version of Rayleigh–Stokes equation, well-known in fluid dynamics, is studied. Namely, condition u(x,T)=βu(x,0)+φ(x), where β an arbitrary real number, proposed instead initial condition. If β=0, then we have inverse time, called backward problem. It that ill-posed sense Hadamard. β=1, corresponding non-local becomes well-posed Hadamard, and ...

background: social capital has been defined as norms, networks, and social links that facilitate collective actions. social capital is related to a number of main social and public health variables. therefore, the present study aimed to determine the factors associated with social capital among the residents of tehran, iran.   methods: in this large cross-sectional population-based study, 31531...

For a vertex and edge weighted (VEW) graph G with weight function fG let Wα,β(G)=∑{u,v}⊆V(G)[αfG(u)×fG(v)+β(fG(u)+fG(v))]dG(u,v) where, α,β∈ℝ dG(u,v) denotes the distance, minimum sum of weights across all paths connecting u,v∈V(G). Assume T is VEW tree, e∈ E(T) fails. If we reconnect two components T−e new ϵ≠e such that, Wα,β(Tϵ\e=T−e+ϵ) minimum, then ϵ called best switch (BS) e w.r.t. Wα,β. W...

The conditions of β−algebra is enforced into the structure cubic intuitionistic fuzzy settings. Furthermore, concept β− subalgebra expressed and its pertinent properties were explored. Also, discussed about level set β−subalgebras furnished some fascinating results on cartesian product β−subalgebra. Moreover, notion -normed have been introduced relevant are studied.

     Diurnal air temperature modeling is a beneficial experimental and mathematical approach which can be used in many fields related to Geosciences. The modeling and spatio-temporal analysis of air Diurnal Temperature Cycle (DTC) was conducted using data obtained from 105 synoptic stations in Iran during the years 2013-2014 for the first time; the key variable for controlling the cosine term i...

Background: The double heterozygous state of α/β thalassemia may alter the hematological indices and modify the phonotype. In addion, definite characterizaon of co-inheritance of α- and β-thalassemia heterozygous carriers may change the process of genec counseling. Materials and Methods: An Iranian couple with low hematological indices was analyzed for α-globin gene deleons using mulpl...

the essential oils from compositae specie of iran: centaurea behen l. obtained by hydrodistillation was analyzed by gc and gc/ms.  β-caryooyllane (24.5%), β-selinene (13.9%) and valencene (11.7%) were the main components among the sixteen constituents characterized in the oil of centaurea behen representing  93.7% of the total components detected.