Synthesis and characterisation of some new cyanonitrosyl chromium(l) complexes with phenetidines and anisidines

Summary A new series of cyano-substituted nitrosylchromium(I) complexes having octahedral stereochemistry around the metal ion, and of general formula, [CrNO(CN)₂(L)₂(H₂O)] (L =o-,m- andp-phenetidines oro-,m-, andp-anisidines) have been isolated in the solid state by interaction of potassium pentacy-anonitrosylchromate(I) monohydrate with the appropriately substituted aniline. The complexes, which have been characterised by elemental analysis, conductance, molecular weight determination, magnetic measurements, e.s.r. and i.r. spectral studies, contain chromium(I) in a low-spin d⁵-configuration.     

Global Representation of Harmonic and Biharmonic Functions

Using some well-known properties of harmonic functions, such as the maximum principle and the existence of the Dirichlet solution, certain representation theorems for harmonic and biharmonic functions are proved in .     

On the representation of biharmonic functions with singularities in ℝ n

Biharmonic functions are defined on Euclidean spaces, Riemannian manifolds, infinite trees, and more generally on abstract harmonic spaces. In this note, we consider biharmonic functions b defined on annular sets Ω \ K and obtain Laurent-type decompositions for b in the Euclidean spaces and in infinite trees. Particular importance is given to the investigation when b extends as a distribution on Ω.     

On polynomial EkP matrices

In this paper the relation betweenEP--matrices andE ^k P--matrices over an arbitrary filedF is studied. Further, conditions for the product ofE ^k P--matrices to be anE ^k P--matrix and for the reverse order law to hold for the polynomial Moore-Penrose inverse of the product ofE ^k P--matrices are determined     

Flavones as Important Scaffolds for Anticancer,Antioxidant and Anti-Tubercular Activities: An Overview of Reports 2015–2020

Moscow University Chemistry Bulletin - Flavonoids are polyphenolic compounds having benzo-?-pyrone structures, which are majorly available in plants. Several flavonoids have been reported,...     

Measurement of circulation rates of coal particles in standpipe of a circulating fluidized bed system (CFBS) using radiotracer technique

Radiotracer technique was applied to measure the circulation rates of fine coal particles in standpipe of a pilot-scale bubbling circulating fluidized bed system (CFBS). ¹⁹⁸Au adsorbed on coal particles was used as a radiotracer. The radiotracer was injected into the standpipe and monitored at four different downstream locations. The circulation times and circulation rates were determined from the measured tracer concentration curves at different operating conditions. The measured parameters were intended to be used for optimizing the performance of existing CFBSs operating in industry and design of a new CFBS to be used as coal gasifier.     

Some potential-theoretic techniques in non-reversible Markov chains

Many of the well known classification theorems of irreducible Markov chains \(X\) placing them into transient or recurrent classes are proved by assuming that \(X\) is reversible. It is shown here that the ‘reversible’ condition in \(X\) can be removed if potential-theoretic methods are used.     

Novel cyano-bridged nitrosyl complexes of chromium(I) with amino- and aminoethyl-pyridines

Summary New compounds of chromium(I), from the interaction of potassium pentacyanonitrosylchromate(I) monohydrate, K₃[CrNO(CN)₅]·H₂O with 2-, 3- and 4-aminopyridines, pyridine-2-hydrazide, 2(2-aminoethyl)pyridine and 4(2-aminoethyl)pyridine are described. The products possess the empirical formula, CrNO(CN)₂(L)₂, for which a cyano-bridged polymeric structure is proposed. Chromium(I) has a low-spin-d⁵ configuration in these complexes.     

Symmetric Harmonic Sheaves Possessing Bipotentials

Let be the family of sheaves H of continuous functions on a Brelot harmonic space with a countable base such that locally the Dirichlet problem with respect to H is solvable, H satisfies Harnack inequalities and also H has a symmetry property. Defining the notions of H-biharmonic functions, H-biharmonic Green functions, H-bipotentials, H-biharmonic extensions, etc. we study the interrelation between them and exhibit various classifications of the family of sheaves.