نتایج جستجو برای: semiperfect ring

تعداد نتایج: 123043  

Journal: :iranian journal of pharmaceutical research 0
aazam monfared dr. mojab zohreh esmaeeli dr. monfared

the anticoagulant racemic warfarin is synthesized by the michael addition of 4-hydroxycoumarin with benzalacetone in the present of equimolar amounts of imidazolium based ionic liquids [bmim] bf4 and [bmim] br and other reaction solvents such as h2o, pyridine and ammonia in five different tests. also synthesis of a derivative of warfarin (2-methyl-4-phenyl pyrano [3, 2-c] chromen-5(4h)-one) und...

Journal: :nanochemistry research 0
fariborz mansouri chemistry department, tarbiat modares university, tehran, iran mehdi sheykhan chemistry department, guilan university, rasht, iran akbar heydari chemistry department, tarbiat modares university, tehran, iran

a mild, green and highly efficient route for regio-selective amination of oxiranes was developed via incorporation of mn(ii), fe(ii), co(ii), ni(ii), cu(ii) and zn(ii) cations onto the surface of hydroxyapatite-encapsulated γ-fe2o3 nanoparticles (γ-fe2o3@hap). among six magnetically recoverable catalytic systems denoted as [γ-fe2o3@hap-mii], the catalyst in which m designated as fe(ii) showed t...

Journal: :nanochemistry research 0
liu jiesheng school of civil engineering and architecture, wuhan polytechnic university, wuhan, china liu ke school of civil engineering and architecture, wuhan polytechnic university, wuhan, china xue lian wu chang hospital, wuhan, china he xiang school of civil engineering and architecture, wuhan polytechnic university, wuhan, china

polydimethylsiloxane (pdms) has been synthesized by ring-opening polymerization of octamethylcyclotetrasiloxane (d4) in microemulsion with acidic catalyst. the structure and properties of microemulsion were characterized by transmission electron microscopy (tem), fourier transform infrared spectroscopy (ft-ir), photo correlation spectroscopy (pcs). the effect of the variation in ph value, amoun...

It is shown that a commutative reduced ring R is a Baer ring if and only if it is a CS-ring; if and only if every dense subset of Spec (R) containing Max (R) is an extremally disconnected space; if and only if every non-zero ideal of R is essential in a principal ideal generated by an idempotent.

Journal: :bulletin of the iranian mathematical society 2016
sh. asgari m. arabi-kakavand h. khabazian

we introduce the class of “right almost v-rings” which is properly between the classes of right v-rings and right good rings. a ring r is called a right almost v-ring if every simple r-module is almost injective. it is proved that r is a right almost v-ring if and only if for every r-module m, any complement of every simple submodule of m is a direct summand. moreover, r is a right almost v-rin...

Journal: :iranian journal of public health 0
massoumeh tajeran dept. of medical genetics, school of medicine, mashhad university of medical sciences (mums) , mashhad, iran. fatemeh baghbani dept. of medical genetics, school of medicine, mashhad university of medical sciences (mums) , mashhad, iran. mohammad hassanzadeh-nazarabadi dept. of medical genetics, school of medicine, mashhad university of medical sciences (mums) , mashhad, iran.

autism is a complex neuropsychiatric disorder that manifests in early childhood. although the etiology is unknown yet but, new hypothesis focused on identifying the key genes related to autism may elucidate its etiology. the main objective of the present study was to verify the value of karyotyping in autistic children and identifying association between chromosome abnormalities and autism.we e...

Journal: :journal of algebra and related topics 2014
m. karimi

let $r$ be a commutative ring. in this paper, by using algebraic properties of $r$, we study the hase digraph of prime ideals of $r$.

Journal: :iranian journal of science and technology (sciences) 2005
m. n. ghosseiri

let r and s be reduced rings with identities whose idempotents are central, and let m be an(r, s)-bimodule such that annr (m)=0. in this paper, we determine first the structure of automorphisms ofthe triangular ring, =sr mt0, and then, for all automorphisms α ,β of t we determine the structureof (α,β)-derivations of t.

For a finite field $mathbb{F}_q$, the bivariate skew polynomial ring $mathbb{F}_q[x,y;rho,theta]$ has been used to study codes cite{XH}. In this paper, we give some characterizations of the ring $R[x,y;rho,theta]$, where $R$ is a commutative ring. We investigate 2-D skew $(lambda_1,lambda_2)$-constacyclic codes in the ring $R[x,y;rho,theta]/langle x^l-lambda_1,y^s-lambda_2rangle_{mathit{l}}.$ A...

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