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The forest code of the Russian Federation requires the reproduction of forests – the process of forest restoration with its inherent natural properties. In practice, the criterion should take into account the relative completeness of the first tier in order to avoid excessive thinning of stands in order to achieve greater participation of target species. From these positions analyzed stands of ...

SUBJECT: лесоведение; лесоводство; reforestation; main fellings; forest science

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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The article presents a methodological toolkit for assessing the ecological and economic damage to forest use from the death and degradation of fir forests as a result of the invasion of the Far Eastern bark beetle Polygrapus proximus in Siberia. Taking into account existing domestic and foreign scientific and methodological approaches used in the field of forestry to assess damage from adverse ...

SUBJECT: four-eyed bark beetle; actual and potential damage; ecological functions of forest; древесные ресурсы; экологические функции леса

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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One of the difficulties arising in connection with the use of branching processes for solving nonlinear equations is the fulfillment of the so-called majorant conditions responsible for the existence and finiteness of the mathematical expectation of estimates built on the trajectories of the branching process. The question of the fulfillment of the majorant condition related to the convergence ...

SUBJECT: iteration method; ветвящийся процесс; нелинейное уравнение; мажорантное условие; majorant condition

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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The method of quantitative determination of noncellulosic polysaccharides in vegetable raw materials (wood and agricultural plants) is offered. He provides determination in the analyzed samples the general content of polysaccharides and cellulose, and noncellulosic polysaccharides are determined by a difference. As a method of determination of cellulose used Kürschner method which differs in s ...

SUBJECT: polysaccharides; нецеллюлозные полисахариды; kürschner cellulose; остаточные пентозаны; residual pentosans

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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The article deals with different approaches to understanding the nature of bonds in cellulose-fibrous systems. Analysis of the results of numerous studies shows that in the manufacture of high-tech pulp and paper products it is necessary to take into account the specifics of the processes of structure formation in dispersed systems, the dispersion medium in which is water or its solutions, at ...

SUBJECT: деформация; fibers; hydrophobic interaction; термофиксация; активация

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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The aim of the work was to answer the questions: did Korean pine (Pinus koraiensis Siebold et Zucc.) grow in the Hasan district of Primorsky region, and if it grew, where and in what conditions and how to restore it in these conditions. The Hasan district occupies the southernmost part of the Primorsky region – south of 43° 25’N. In the second half of the XIXth century Korean pine was found he ...

SUBJECT: подпологовые культуры; дубняки; korean pine; кедр корейский; subordinate plantings

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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A study was made of the dynamics of the state of the pine stand of an ordinary pine tree growing in the village of Lembolovo in the Leningrad Region over a 4-year period: an estimate of the phytosanitary state of trees with an average standpoint over the years, the calculation of dead trees, and the main factors of weakening of the stand. It was established that trees with attempts to colonize ...

SUBJECT: сосновые лубоеды; population accounting; pine-eel; дополнительное питание; факторы ослабления

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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A mathematical model of a dynamic system has been developed: «The feller buncher – subject of labor – the tree». The mathematical description is made up in the form of the Lagrange equation of the 2nd kind. The system of equations is solved by the Runge–Kutta method, using the MathCAD programming environment. Approbation of the model is carried out on the example of the commercially available ...

SUBJECT: динамическая нагрузка; feller buncher; валочно-пакетирующая машина; mathematical model; dynamic load

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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The paper considers the general technology for designing a forest road route in space and the rationale for choosing the most effective method for specific conditions. In the method of approximation of a sequence of points, a dialog mode, that is, a mode of operative communication between a designer and a computer in the process of solving a problem, is widely used. In order to save computer t ...

SUBJECT: проектирование; forest roads; design; метод последовательности точек; method of sequence of points

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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The study of the strength of glued joints of glued beams has been devoted to a large number of works of domestic scientists, the analysis of which allows us to identify significant factors, the main ones being the moisture and density of wood and the type of glue used. With an increase in moisture content of more than 12% when gluing with urea and phenol-formaldehyde adhesives, the level of th ...

SUBJECT: прочность; gluing of solid wood; strength; склеивание цельной древесины; destruction of adhesive layer

POSTED TO: Izvestia Sankt-Peterburgskoj Lesotehniceskoj Akademii [Известия Санкт-Петербургской лесотехнической академии]

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