St Petersburg State Academy Of Forestry Engineering

Saint Petersburg, Russia

St Petersburg State Academy Of Forestry Engineering

Saint Petersburg, Russia
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Martynova A.I.,St Petersburg State Academy Of Forestry Engineering | Orlov V.V.,Saint Petersburg State University
Astronomy Reports | Year: 2011

Numerical simulations of near-resonant motions occurring in planar rotating systems of three bodies with equal masses are presented for the cases of prograde and retrograde motions of the inner and outer pairs. The ratios n: m of the initial periods of these pairs are within 1 ≤ m ≤ n ≤ 7. It is shown that, as a rule, retrograde are more stable than prograde motions. The k loop structures oriented inwards for prograde and outwards for retrograde motions are revealed. Empirical relations between k and n are found for the main resonances n: 1 and n: 2. © 2011 Pleiades Publishing, Ltd.


Spirina T.N.,RAS Institute of Macromolecular Compounds | Saprykina N.N.,RAS Institute of Macromolecular Compounds | Andreeva O.A.,RAS Institute of Macromolecular Compounds | Kulikova E.M.,RAS Institute of Macromolecular Compounds | And 3 more authors.
Russian Journal of Applied Chemistry | Year: 2012

The morphology of hydrolysis lignin was studied. The effect of dimethyl sulfoxide, temperature, and activating additives on the surface characteristics of lignin was examined. © 2012 Pleiades Publishing, Ltd.


Sazanov Y.N.,RAS Institute of Macromolecular Compounds | Popova E.N.,RAS Institute of Macromolecular Compounds | Sumerskii I.V.,St Petersburg State Academy Of Forestry Engineering | Mokeev M.V.,RAS Institute of Macromolecular Compounds | And 5 more authors.
Russian Journal of Applied Chemistry | Year: 2010

Conclusions on the reactivity of lignin in thermal processes are made on the basis of published data and results of thermal analysis of lignin samples from certain hydrolysis enterprises. © 2010 Pleiades Publishing, Ltd.


Baidakov D.L.,St Petersburg State Academy Of Forestry Engineering | Shkol'nikov E.V.,St Petersburg State Academy Of Forestry Engineering | Ryseva V.A.,St Petersburg State Academy Of Forestry Engineering
Glass Physics and Chemistry | Year: 2010

The electrical conductivity of chalcogenide semiconductor films in the CuI-AsI3-As2Se3 and CuI-SbI3-As 2Se3 systems, which have been prepared by chemical deposition from mono-n-butylamine, has been studied as a function of the temperature and film composition. It has been established that the electrical conductivity of the CuI-AsI3-As2Se3 and CuI-SbI3-As2Se3 films is predominantly determined by the copper iodide content. It has been demonstrated that the electrical properties of the chalcogenide glasses and the related films are characterized by the same values to within the experimental error, which is explained by the same model of dissolution of vitreous semiconductors in amines with the retention of the electrical properties of chalcogenide glasses after the deposition of films from their solutions. © Pleiades Publishing, Ltd., 2010.


Evstigneev E.I.,St Petersburg State Academy Of Forestry Engineering
Russian Journal of Applied Chemistry | Year: 2010

The solubility of lignin in aqueous NaOH solutions and dioxane-water mixtures was studied. Factors governing the solubility of lignin in these media were determined. © 2010 Pleiades Publishing, Ltd.


Shchukin A.O.,St Petersburg State Academy Of Forestry Engineering | Vasil'Ev A.V.,St Petersburg State Academy Of Forestry Engineering | Grinenko E.V.,St Petersburg State Academy Of Forestry Engineering
Russian Journal of Organic Chemistry | Year: 2010

Conjugated arylacetylenic ketones and aldehydes, propargyl-type alcohols, and arylacetylenes reacted with arenes in the presence of AlBr3 or AlCl3 as catalyst to give substituted indenes. 3-Arylpropynoic acids under analogous conditions gave rise to 3,3-diarylindan-1-ones, while the corresponding methyl esters were converted into methyl 3,3-diarylprop-2-enoates. The key intermediates in the transformations of acetylenic ketones and aldehydes and propargyl-type alcohols into indene derivatives are resonance-stabilized propargyl-allenyl cations -C≡C-C+ ↔-C+=C=C which reacted with one of the resonance structures to give isomeric indenes, depending on the substituent nature. © 2010 Pleiades Publishing, Ltd.


Evstigneev E.I.,St Petersburg State Academy Of Forestry Engineering
Russian Journal of Applied Chemistry | Year: 2011

The solubility of lignin in aqueous NaOH solutions was studied in relation to the lignin molecular weight, temperature, liquid to solid ratio, and ionic strength. A new procedure for determining the content of phenolic hydroxyls in lignin was developed. A formula was suggested for calculating the lignin solubility in aqueous alkali solutions. © 2011 Pleiades Publishing, Ltd.

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