Application of random search algorithms at optimization of electric energy quality in networks of stationary railway enterprises

The possibility of constructing the optimal control system of electric energy quality based on the established deviation and asymmetry of voltage at stationary railway enterprises applying the principle of correcting device decentralized arrangement has been shown

Evaluation of the impact of technogenically polluted wastewater on the morphological and physiological parameters of phytoremediants in combination with various types of microorganisms

The article presents data on the study of the effect of technogenically polluted wastewater on digital biomass and NDVI parameters of phytoremediants. Analysis of plant growth and development was carried out on Phragmites australis (Cav.) Trin. ex Steud. (obtained by in vitro method), Typha angustifolia L. and T. latifolia L. (obtained from seeds). All species were grown in combination with various microorganisms under the influence of technogenically polluted wastewater. The most effective combinations of symbiotic microbial-plant complexes have been identified, which are able to function actively under pollution conditions and can be recommended for their use in wastewater treatment

Quantum effects, soft singularities and the fate of the universe in a braneworld cosmology

We examine a class of braneworld models in which the expanding universe encounters a "quiescent" future singularity. At a quiescent singularity, the energy density and pressure of the cosmic fluid as well as the Hubble parameter remain finite while all derivatives of the Hubble parameter diverge (i.e., ${\dot H}$, ${\ddot H}$, etc. $\to \infty$). Since the Kretschmann invariant diverges ($R_{iklm}R^{iklm} \to \infty$) at the singularity, one expects quantum effects to play an important role as the quiescent singularity is approached. We explore the effects of vacuum polarization due to massless conformally coupled fields near the singularity and show that these can either cause the universe to recollapse or, else, lead to a softer singularity at which $H$, ${\dot H}$, and ${\ddot H}$ remain finite while {\dddot H} and higher derivatives of the Hubble parameter diverge. An important aspect of the quiescent singularity is that it is encountered in regions of low density, which has obvious implications for a universe consisting of a cosmic web of high and low density regions -- superclusters and voids. In addition to vacuum polarization, the effects of quantum particle production of non-conformal fields are also likely to be important. A preliminary examination shows that intense particle production can lead to an accelerating universe whose Hubble parameter shows oscillations about a constant value.Comment: 19 pages, 3 figures, text slightly improved and references added. Accepted for publication in Classical and Quantum Gravit

Adsorption of Reactive Particles on a Random Catalytic Chain: An Exact Solution

We study equilibrium properties of a catalytically-activated annihilation $A + A \to 0$ reaction taking place on a one-dimensional chain of length $N$ ($N \to \infty$) in which some segments (placed at random, with mean concentration $p$) possess special, catalytic properties. Annihilation reaction takes place, as soon as any two $A$ particles land onto two vacant sites at the extremities of the catalytic segment, or when any $A$ particle lands onto a vacant site on a catalytic segment while the site at the other extremity of this segment is already occupied by another $A$ particle. Non-catalytic segments are inert with respect to reaction and here two adsorbed $A$ particles harmlessly coexist. For both "annealed" and "quenched" disorder in placement of the catalytic segments, we calculate exactly the disorder-average pressure per site. Explicit asymptotic formulae for the particle mean density and the compressibility are also presented.Comment: AMSTeX, 27 pages + 4 figure

АНАТОМО-ЭКСПЕРИМЕНТАЛЬНОЕ ОБОСНОВАНИЕ И КЛИНИЧЕСКОЕ ПРИМЕНЕНИЕ НОВЫХ МИКРОХИРУРГИЧЕСКИХ АНТИРЕФЛЮКСНЫХ АНАСТОМОЗОВ В РЕКОНСТРУКТИВНОЙ ХИРУРГИИ ВНЕПЕЧЕНОЧНЫХ ЖЕЛЧНЫХ ПУТЕЙ

On a section material and in experiment on 195 not purebred dogs and 130 organocomplexis corpses of people working out and an anatomo-experimental substantiation of 8 new functionally active microsurgical biliodigestivе anastomoses, possessing sphincterniс and antireflux is carried out by properties. Use of principles microsurgery technique of operating solves problems of the reconstructive operations connected with application of the traditional surgical technique, such, as an inconsistency of seams biliodigestive ways, a peritonitis, relapse cicatricial stricturi, regurgitation cholangitis. In clinical practice the microsurgical technique and developed ways of biliodigestive anastomoses are applied at 67 patients with good result.На секционном материале и в эксперименте на 195 беспородных собаках и 130 органокомплексах трупов людей осуществлена разработка и анатомо-экспериментальное обоснование 8 новых функционально активных способов микрохирургических билиодигестивных анастомозов, обладающих сфинктерными и антирефлюксными свойствами. Использование принципов микрохирургической техники оперирования решает проблемы реконструктивных операций, связанных с применением традиционной хирургической техники, таких, как несостоятельность швов билиодигестивного соустья, перитонит, рецидив рубцовой стриктуры, регургитационный холангит. В клинической практике микрохирургическая техника и разработанные способы билиодигестивных соустий применены у 67 больных с хорошим результатом.

Synthesis and properties of the heterospin (S1 = S2 = 1/2) radical-ion salt bis(mesitylene)molybdenum(I) [1,2,5]thiadiazolo[3,4-c][1,2,5]thiadiazolidyl

The authors are grateful to the Presidium of the Russian Academy of Sciences (Project 8.14), the Royal Society (RS International Joint Project 2010/R3), the Leverhulme Trust (Project IN-2012-094), the Siberian Branch of the Russian Academy of Sciences (Project 13), the Ministry of Education and Science of the Russian Federation (Project of Joint Laboratories of Siberian Branch of the Russian Academy of Sciences and National Research Universities), and the Russian Foundation for Basic Research (Projects 13-03-00072 and 15-03-03242) for financial support of various parts of this work. N.A.S. thanks the Council for Grants of the President of Russian Federation for postdoctoral scholarship (grant MK-4411.2015.3). B.E.B. is grateful for an EaStCHEM Hirst Academic Fellowship. A.V.Z. thanks the Foundation named after D. I. Mendeleev, Tomsk State University, for support of his work.Low-temperature interaction of [1,2,5]thiadiazolo[3,4-c][1,2,5]thiadiazole (1) with MoMes2 (Mes = mesitylene / 1,3,5-trimethylbenzene) in tetrahydrofuran gave the heterospin (S1 = S2 = 1/2) radical-ion salt [MoMes2]+[1]– (2) whose structure was confirmed by single-crystal X-ray diffraction (XRD). The structure revealed alternating layers of the cations and anions with the Mes ligands perpendicular, and the anions tilted by 45°, to the layer plane. At 300 K the effective magnetic moment of 2 is equal to 2.40 μB (theoretically expected 2.45 μB) and monotonically decreases with lowering of the temperature. In the temperature range 2−300 K, the molar magnetic susceptibility of 2 is well-described by the Curie-Weiss law with parameters C and θ equal to 0.78 cm3⋅K⋅mol–1 and −31.2 K, respectively. Overall, the magnetic behavior of 2 is similar to that of [CrTol2]+[1]– and [CrCp*2]+[1]–, i.e. changing the cation [MAr2]+ 3d atom M = Cr (Z = 24) with weak spin-orbit coupling (SOC) to a 4d atom M = Mo (Z = 42) with stronger SOC does not affect macroscopic magnetic properties of the salts. For the XRD structure of salt 2, parameters of the Heisenberg spin-Hamiltonian were calculated using the broken-symmetry DFT and CASSCF approaches, and the complex 3D magnetic structure with both the ferromagnetic (FM) and antiferromagnetic (AF) exchange interactions was revealed with the latter as dominating. Salt 2 is thermally unstable and slowly loses the Mes ligands upon storage at ambient temperature. Under the same reaction conditions, interaction of 1 with MoTol2 (Tol = toluene) proceeded with partial loss of the Tol ligands to afford diamagnetic product.PostprintPostprintPeer reviewe

Line mixing in the 60-GHz atmospheric oxygen band: Comparison of the MPM and ECS model

International audiencePrecise profiles of the 60-GHz molecular oxygen band recorded earlier in a wide temperature range by means of a resonator spectrometer at atmospheric pressure were treated. High signal-to-noise ratio allows careful study of the band shape taking into consideration the mixing effect. Comparative analysis of the band profile calculated by an extended MPM (Millimeter-wave Propagation Model) and by the ECS (Energy Corrected Sudden) approximation model is presented. Some limitations of the MPM approach are discussed on the basis of the comparison of the two models. Interbranch coupling is shown to make a noticeable contribution to absorption which means that it should be taken into account as it is expected to improve band profile modeling accuracy