Chemiluminescence determination of ω-chloroacetophenone

A chemiluminescence method for the determination of ω-chloroacetophenone in ethanolic extracts is elaborated. The method is based on the linearity of the concentration dependence of the intensity of luminol chemiluminescence upon the action of peroxide species forming in the reaction of ω-chloroacetophenone with air oxygen activated by hemin in alkaline solutions. The detection limit makes (1.0 ± 0.3) × 10⁻⁵ mg/mL (P = 0.95, n = 5, RSD = 32 %) at 293 K.     

Testing Monte Carlo methods for path integrals in some quantum mechanical problems

The metropolis algorithm for numerical simulation of configurations, widely used nowadays for lattice gauge theories, is applied to the evaluation of path integrals of quantum mechanics. Our aim is both to test the method in the case of well-known systems (nonlinear oscillator, H and He atoms) and also to consider its ability to treat more complicated systems with more degrees of freedom (light nuclei up to ⁴He). We also show how effective the method is for the evaluation of Green functions in arbitrary (multidimensional) potentials.     

Molecular dynamics simulation of deformation and fracture of graphene under uniaxial tension

The paper reports on molecular dynamics simulation of deformation and fracture of graphene under uniaxial tension. Dependences of Young’s modulus, critical force and fracture strain on the strain rate, temperature and angle between the tension direction and the graphene lattice are derived. The effect of defects on fracture of graphene is studied.     

Liquid-phase hydrogenation of cyclohexene by dihydrogen in the presence of dimolybdenum tetraacetate

Catalytic liquid-phase hydrogenation of cyclohexene in DMF by dihydrogen in the presence of dinuclear bridged complex Mo₂(OAc)₄ has been studied. A kinetic equation for the steady-state rate of cyclohexene hydrogenation and the activation parameters are suggested.

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Mo₂(OAc)₄. .

     

Quantum resonances of the kicked rotor and the SU(q) group

The quantum kicked rotor map is embedded into a continuous unitary transformation generated by a time-independent quasi Hamiltonian. In some vicinity of a quantum resonance of order q, we relate the problem to the regular motion along a circle in a (q(2)-1) component inhomogeneous "magnetic" field of a quantum particle with q intrinsic degrees of freedom described by the SU(q) group. This motion is in parallel with the classical phase oscillations near a nonlinear resonance.     

Vacuum pressure effects in low-p⊥ hadronic spectra

Nonperturbative fluctuations in the QCD vacuum create a “bag”, which shows itself in the low-p_⊥ spectra of secondaries by the suppression of the transverse collective expansion, so that the spectra are nearly thermal, in agreement with the data.     

Yttrium Coordination Compounds with Nitrilotris(Methylenephosphonic Acid)

Russian Journal of Coordination Chemistry - Nitrilotris(methylenephosphonato)yttrium [YH3{N(CH2PO3)3}] · 2H2O (I) and octapotassium monohydro-bis-nitrilotris(methylenephosphonato)yttriate...