• Energy Research
• Restricted close
• RU close
• English close

This study explores the use of energy savings technologies in timber production for wood housing construction. Methods applied were based on the creation of system of optimized regimes of drying of sawn timber was carried out in two stages: computing experiment with the tools of MathCAD and production experiment. The findings discovered the following tendency: however the minimum cost of energy is achieved at the minimum time of drying that is explained by an essential difference in the cost of thermal and electric energy. The regimes of steeples structure received by computer modeling allow receiving sawn timber that fully meets the requirements of the consumer without application of moisture treatment and the conditioning processing. The developed technique of formation of the steeples regimes of drying of sawn timber allows determining structure and sizes of parameters of the regime depending on the required quality of drying and energy costs on its carrying out. Calculations of technical and economic efficiency have shown that the total annual economic effect in more than 17 dollars per 1 m3 and it can be extended by including on power component. © 2018 CEUR-WS. All rights reserved. The work is carried out based on the task on fulfilment of government contractual work in the field of scientific activities as a part of base portion of the state task of the Ministry of Education and Science of the Russian Federation to Ural State Forest Engineering University (the # 26.8660.2017/8.9 "The Research Methodology of Forms of Economic and Technological Reality in the Aspect of Sustainable Forest Management").

Coordinate pulsewidth modulation is considered for the control of power switches of matrix and two-component direct frequency converters (DFC) in ac drive systems. The synthesis of modulating signals yielding the specified output voltages and sinusoidal grid currents for converters with no intermediate smoothing filter is discussed. Simulation of DFC operation with an RLE load and an asynchronous motor is undertaken.

When using the unique in terms of the volumes of databases on the level of a stand of Picea and Abies spp., the trans-Eurasian additive allometric models of biomass for Eurasian forests are developed for the first time, and thereby the combined problem of model additivity and generality is solved. The additive model of forest biomass of Picea and Abies is harmonized in three levels, one of which provides the principle of additivity of biomass components, the second one is associated with the introduction of dummy independent variables localizing model for eco-regions of Eurasia, and the third one makes the biomass structure of spruce and fir compatible by means of binary variable. The model can be developed further according to the third level of harmonization, when instead of the binary variable one can include another block of dummy variables coding the membership of actual biomass data of each eco-region to basic forest-forming wood species in Eurasia. This might be a subject for further research. © 2018 CEUR-WS. All rights reserved.

One of the most important key factors for the development of non-urban areas is infrastructure, and energy generation is one of the fundamental infrastructure elements. This paper provides a new solution for energy generation based on wood chips which has a multi-sector effect because the authors offer to combine planning of forest cleaning cutting with bioenergy generation in one complex project, which will have socio-economic and ecological effects. The situation with forest fires makes the authors’ idea more attractive because after forest fires the problem of cleaning cutting in forest becomes very important and urgent by ecological and economical points: after cleaning cutting there are a lot of low quality wood which can be recycled into chips for the production bioenergy by the authors’ idea. This enriched methodology has successfully been applied into the regional strategical planning in the field of bioenergy and forestry of the Ural region of Russia; however, it is suitable for applications in regional development in any non-urban forested region of the world. © 2017, Editura Universitatii din Bucuresti. All rights reserved.

The relevance of the analyzed issue is due to the increasing importance of the green economy in the world and in Russia in particular. Priorities of the development of the world energy are in the development of alternative sources of energy to improve energy efficiency. The purpose of the article is to analyze the development of renewable energy sources (RES) in Russia and to assess the potential for using renewable energy of regions in Russia. The leading approach to the study of this issue is the study of renewable energy data and public policy in Russia to stimulate innovative methods. The article analyzes the level of effectiveness of the implemented projects in the Russian Federation in Arkhangelsk and Irkutsk regions. The authors select the most interesting and unique projects in the city of Anapa, Yailyu, in Kamchatka and in the Republic of Crimea. The data of the article may be useful for research on the analysis and comparison of the world's renewable energy development trends. © International Economic Society.

Diffusion coefficients for Ba-133, Sr-90, and Ca-45 radionuclides in the solid solution Ba(3-3x)La(2x)rectangle(x)(VO4)(2) (x = 0, 0.05, 0.1, 0.15) are measured in the temperature range 800 to 1000 degrees C using the layer-by-layer radiometric analysis. It is established that D-Ca(*) greater than or equal to D-Sr(*) > D-Ba(*). Increasing the concentration of vacancies rectangle in the barium sublattice leads to an increase in the diffusion coefficients of the alkaline-earth metal cations. The activation energies for the radionuclide diffusion are determined; their values (similar or equal to 1.1 eV) are close to the activation energy for ionic conduction. Cations M2+ are shown to migrate via the positions of Ba(2).

The design of a new type of frequency converter is considered: a two-component direct frequency converter, permitting direct reversible conversion of ac energy, with sinusoidal grid and load currents; this design is free from the switching conflicts of matrix-type direct frequency converters.

For the first time in Russian literature the problem of harmonizing allometric models of forest biomass components (stem, branches, foliage, roots) on the levels of tree and forest stand by means of ensuring the principle of their additivity has been solved. Allometric models are designed using two unique volume of the databases on harvest biomass of two-needled pines (subgenus Pinus L. involving 86% of Pinus sylvestris L. data) on the levels of sample trees (2080 determinations) and forest stands (2450 determinations) growing within their natural habitats in Eurasia. The principle of additivity implies that the sum of biomass values obtained by component equations should be equal to the value of total biomass obtained by the general equation for total biomass. When using binary variable designating natural forests and plantations, additive systems of biomass component relations, as transcontinental three-step models of proportional weighting are designed. On their basis the corresponding taxation tables of the biomass component composition involving basic mass-determining inputs are suggested. In contrast to aggregating method of designing the additive model according to the principle “from particular - to general”, an alternative, disaggregating three-step method is applied when using another principle “from general - to particular”. The proposed models and corresponding biomass tables make it possible to estimate tree (kg) and stand (t/ha) biomass of Pinus forests on the Eurasian area as the first approximations when using traditional taxation. Because such transcontinental models and tables may have biases in local conditions for their application, in the next stage of this research more detailed, regional forest biomass models and tables through the “splitting” proposed here, common models into regional ones using the blocks of dummy variables will be developed. © 2018 Technoscience Publications. All rights reserved.

In recent years, the problem of assessing the replaceability of various types of raw materials and products in the energy market, in the production of heat and electricity, has become increasingly relevant. Wood fuel in the form of pellets and wood chips has several substitutes with uncertain consumption prospects. This paper presents different approaches to assessing the efficiency of using wood materials as fuels due to high expectations from the development of a "green economy", designed to replace the use of non-renewable natural resources in energy production. © Proceedings of Scientific Papers - Current Trends and Challenges for Forest-Based Sector: Carbon Neutrality and Bioeconomy, WoodEMA 2023.