Temperature and layer number dependence of the G and 2D phonon energy and damping in graphene

We have studied the temperature and size dependence of the G and 2D phonon modes in graphene. It is shown that in a graphene monolayer the phonon energy decreases whereas the phonon damping increases with increasing temperature. The electron-phonon interaction leads to hardening whereas the fourth-order anharmonic phonon-phonon processes lead to softening of the phonon energy with increasing temperature. We have shown that the electron-phonon interaction plays an important role also by the dispersion dependence of the phonon G mode, by the observation of the Kohn anomaly. The G mode frequency decreases and damping increases, whereas the 2D phonon frequency and damping increase with increasing layer number. The temperature and size effects of the 2D mode are much stronger than those of the G mode.     

Electrolytic Preparation of Vanadium(V) Oxide from Saturated Solutions of Ammonium Metavanadate

A study was made of the voltammetric characteristics and dependences of the deposition rate and current efficiency on the electrolysis conditions in anodic deposition of vanadium(V) oxide on a stainless steel support from saturated solutions of ammonium vanadate, including those containing active and supporting additives.     

Electrolytic Synthesis of Complex Oxide Systems by Cathodic Deposition of Molybdenum Oxide from Aqueous Solutions in the Presence of Nickel(II) and Thiosulfate Ions

Cathodic processes occurring in electrolytic deposition of molybdenum oxide from aqueous solutions of sodium molybdate in the presence of nickel(II) and thiosulfate ions were studied. Conditions for formation of cathodic deposits in the form of complex oxide systems Mo-Ni and Mo₄O_{1 1}-MoS₂ were determined.     

Anodic processes occurring upon V<Subscript>2</Subscript>O<Subscript>5</Subscript> electrodeposition

Kinetics of the anodic processes occurring upon V₂O₅ electrodeposition from VOSO₄ solutions containing Na⁺ ions was studied by the method of polarization curves. The mechanism of their formation was suggested, based on the analysis of the morphology of the deposit surface.     

Electrolytic Preparation of Vanadium(V) Oxide from Oxovanadium(IV) Sulfate Solutions in the Presence of Sodium Ions

Effect of various factors on the character of anodic processes and the properties of vanadium(V) oxide deposits electroplated from oxovanadium(IV) sulfate solutions in the presence of sodium ions was studied.     

Relationship between the organization of the PS II super complex and the functions of the photosynthetic apparatus

The chlorophyll fluorescence and the photosynthetic oxygen evolution (flash-induced oxygen yield patterns and oxygen bursts under continuous irradiation) were investigated in the thylakoid membranes with different stoichiometry and organization of the chlorophyll-protein complexes. Data show that the alteration in the organization of the photosystem II (PS II) super complex, i.e. the amount and the organization of the light-harvesting chlorophyll a/b protein complex (LHCII), which strongly modifies the electric properties of the membranes, influences both the energy redistribution between the two photosystems and the oxygen production reaction. The decrease of surface electric parameters (charge density and dipole moments), associated with increased degree of LHCII oligomerization, correlates with the strong reduction of the energy transfer from PS II to PSI. In the studied pea thylakoid membranes (wild types Borec, Auralia and their mutants Coeruleovireus 2/16, Costata2/133, Chlorotica XV/1422) with enhanced degree of oligomerization of LHCII was observed: (i) an increase of the S(0) populations of PS II in darkness; (ii) an increase of the misses; (iii) an alteration of the decay kinetics of the oxygen bursts under continuous irradiation. There is a strict correlation between the degree of LHCII oligomerization in the investigated pea mutants and the ratio of functionally active PS II alpha to PS II beta centers, while in thylakoid membranes without oligomeric structure of LHCII (Chlorina f2 barley mutant) the PS II alpha centers are not registered.     

复合模型和∑的四体衰变

本文计算了∑的四体衰变在∑的复合模型和通常的理论中的几率W^奇和W^偶,得到W^奇比W^偶约大50倍。W^奇为的β衰变几率的2—3％。     

A comparison of the k-approximation and the l-approximation of the blackening curves of some photographic materials for spectrography

The experimental and computed blackening curves of some Orwo spcctrographic plates are compared. In spectrochemical applications, the two approximation equations are found to give equal errors. In optimizing the photographic registration of spectra the l-approximation equation is found to be advantageous both for its better approximation of the slope of the blackening curve and providing a clear physical meaning of all the parameters involved in this equation.     

Studies of Fe2(CO)9 Formation in the Thermolysis of Fe(CO)5 Using Ab Initio Calculations of Fe(CO)5 and Fe(CO)4

Ab initio calculations using the GAMESS program package in the atomic basis TZV (Fe: (14s, 11p, 6d)/[10s, 8p, 3d]; C, O: (11s, 6p)/[5s, 3p]) were performed with account taken of the correlation with the second-order Möller–Plesset (MP2) perturbation theory to predict a new conformer Fe(CO)₄ (with D _4h symmetry). This conformer has a square planar configuration in the ground singlet electronic state and is a mild electrophile produced by dissociation of Fe(CO)₅ along the axial Fe–C bond. The process of nucleation of iron nanoparticles Fe(CO)₅ + Fe(CO)₄ Fe₂(CO)₉ is supposed to occur in two stages. The first stage is an orbital-controlled reaction which should be monitored as an increase in medium polarity and temperature. It should proceed with participation of only one of the stable conformers of the nucleophile Fe(CO)₅, namely, a mild conformer with square-pyramidal structure (C _4v ) rather than a hard but energetically more advantageous conformer with trigonal–bipyramidal structure (D _3h ). The structure of a prereaction complex was discussed.     

Thin-Layer Electrolytic Molybdenum Oxydisulfides for Cathodes of Lithium Batteries

Electrolytic molybdenum oxydisulfides are synthesized out of aqueous molybdate solutions containing sulfur in the presence of ions of Ni²⁺ with the aim of applying them as materials for ballastless cathodes of thin-layer lithium batteries. The physicochemical and structural properties of the synthesized compounds are studied profilometrically and by methods of thermal and x-ray diffraction analyses, absorption IR spectroscopy, and atomic force microscopy. Specific discharge characteristics, the chemical diffusion coefficient of lithium ions, the interaction parameter of intercalated ions, and the repulsion energy of intercalated ions in the process of intercalation and deintercalation of lithium ions in the synthesized materials are determined.