Tver State Technical University

www.tstu.tver.ru
Tver, Russia

Time filter

Source Type

Burdo G.B.,Tver State Technical University
Russian Engineering Research | Year: 2017

Means of faster and better technological preparation for multiproduct manufacturing are considered. The possibility of technological preparation in parallel with design and organizational preparation is demonstrated. An approach to organizational and technological design in the development of manufacturing processes is proposed. In this approach, the dynamics and goals of production systems are taken into account. A timeline for the introduction of the proposed approach is outlined, and the conditions for its successful implementation are specified. © 2017, Allerton Press, Inc.


Schletterer M.,University of Innsbruck | Fureder L.,University of Innsbruck | Kuzovlev V.V.,Tver State Technical University | Beketov M.A.,Helmholtz Center for Environmental Research
Ecological Indicators | Year: 2010

In contrast to most large rivers in Europe, the biggest European river Volga including its tributaries has still remained uncontaminated in its headwaters. Therefore the upper Volga River system represents an appropriate system for investigation of relations of bioassessment indices with natural environmental factors. Moreover, it allows the definition of reference conditions for medium-size and large lowland rivers in Europe. The aim of this study was to analyse relations between Saprobic Index (SI), SPEAR indices, and other macroinvertebrate community indices and basic environmental factors in the upper Volga River system. Besides, preliminary ecological status classification (according to the EU Water Framework Directive) was proposed for SI and SPEARpesticides indices for the system investigated. The analysed data set contained information on macroinvertebrates, basic habitat characteristics and water physico-chemical parameters from 53 sample sites. The results showed that SI and SPEAR indices were independent of channel width and related river longitudinal factors. Furthermore, the results indicated the index SPEARpesticides to be potentially applicable across different types of watercourses as well as across different biogeographical regions in Europe showing similar boundaries of ecological status classes (at least between High, Good, and Moderate). A Multi-Habitat-Sampling method was recommended for SPEARpesticides. Saprobic reference conditions of the lowland rivers were found to be beta-mesosaprobic. The relatively high boundary between High and Good classes resulted from naturally high organic matter concentrations. Due to indicating common pollution sources (i.e. organic, agricultural and industrial), the herein suggested methodologies have a potential to be applied in other large river systems in Europe. The reference condition characteristics described for the headwaters of the Volga River system can be used as a reference for medium-sized and large rivers in the regions where establishment of reference sites of these types is impossible (e.g., many regions in Europe). © 2010 Elsevier Ltd. All rights reserved.


Grant
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: NMP.2013.1.1-1 | Award Amount: 12.34M | Year: 2013

BIO-GO-For-Production is a Large Scale Collaborative Research Project that aims to achieve a step change in the application of nanocatalysis to sustainable energy production through an integrated, coherent and holistic approach utilizing novel heterogeneous nanoparticulate catalysts in fuel syntheses. BIO-GO researches and develops advanced nanocatalysts, which are allied with advanced reactor concepts to realise modular, highly efficient, integrated processes for the production of fuels from renewable bio-oils and biogas. Principal objectives are to develop new designs, preparation routes and methods of coating nanocatalysts on innovative micro-structured reactor designs, enabling compact, integrated catalytic reactor systems that exploit fully the special properties of nanocatalysts to improve process efficiency through intensification. An important aim is to reduce the dependence on precious metals and rare earths. Catalyst development is underpinned by modelling, kinetic and in-situ studies, and is validated by extended laboratory runs of biogas and bio-oil reforming, methanol synthesis and gasoline production to benchmark performance against current commercial catalysts. The 4-year project culminates in two verification steps: (a) a 6 month continuous pilot scale catalyst production run to demonstrate scaled up manufacturing potential for fast industrialisation (b) the integration at miniplant scale of the complete integrated process to gasoline production starting from bio-oil and bio-gas feedstocks. A cost evaluation will be carried out on the catalyst production while LCA will be undertaken to analyse environmental impacts across the whole chain. BIO-GO brings together a world class multi-disciplinary team from 15 organisations to carry out the ambitious project, the results of which will have substantial strategic, economic and environmental impacts on the EU petrochemicals industry and on the increasing use of renewable feedstock for energy.


Grant
Agency: European Commission | Branch: FP7 | Program: CP-IP | Phase: NMP-2009-3.2-1 | Award Amount: 10.03M | Year: 2010

POLYCAT provides an integrated, coherent and holistic approach utilizing novel polymer based nanoparticulate catalysts in pharmaceutical, crop protection and vitamin syntheses in conjunction with the enabling functions of micro process technology and green solvents such as water or ethyl lactate. This provides a discipline bridging approach between fine chemistry, catalysis and engineering. This will lead to the replacement of a number of chemical or microbiological reaction steps in fine chemical syntheses by catalytic ones using more active, selective and stable nanoparticulate catalysts. In addition, POLYCAT will lead to the development of novel chiral modifiers immobilized on the polymeric supports. Micro process technology provides testing under almost ideal processing conditions, with much improved heat management, with improved costing, at high data validity, at high process confidence, and with high certainty for scale-out. The industrial applicability is demonstrated by scale-out of the industrial demonstration reactions to the pilot scale. A multi-purpose, container-type plant infrastructure will integrate individual reaction and separation modules in block format, standardised basic logistics, process control, safety installations, and on-line analytics. As guidance before (ex-ante) and during the whole development, holistic life cycle (LCA) and cost analyses will pave directions towards competitiveness and sustainability. The POLYCAT technologies have potential to reduce the environmental impact by 20% up to orders of magnitude: e.g. reduction of green house gas emissions, acids (SO2-Eq.), nutrients (NOx-Eq.), toxic substances (1,4-DCB Eq.) and finite abiotic resources (antimony eq.). With (enantio)selectivity increases up to 25%, solvent reductions of 30-100%, and products cost decreases of about 10%, a midterm impact of 30-110 Mio Euro and longterm impact of 100-560 Mio Euro result.


Solnyshkin A.V.,Tver State University | Kislova I.L.,Tver State Technical University
Ferroelectrics | Year: 2010

The frequency dependence of real (ε′) and imaginary (ε″) components of the complex dielectric permittivity (ε*) of poly(vinylidene fluoride-triflouroethylene) copolymer has been determined in the temperature range from -40 to 140°C including the transition to glassy state at Tg ≈ -25°C and ferroelectric-to-paraelectric (F-P) transition. During the cooling, the relaxor-like behavior is observed up to TC for enough high frequencies. Analysis of the dielectric dispersion spectra was carried out using the Havriliak-Negami empirical model. The observed peculiarities of the dielectric response are discussed on the basis of the coexistence of both the short range and long range interactions. Copyright © Taylor & Francis Group, LLC.


Makarov A.N.,Tver State Technical University
Thermal Engineering (English translation of Teploenergetika) | Year: 2014

The progress seen in the 19th-21st centuries in the development of methods for calculating heat transfer in torch furnaces, fireboxes, and combustion chambers is analyzed. Throughout the 20th century, calculations of heat transfer were carried out based on the law for radiation from solid bodies deduced by Y. Stefan and L. Boltzmann. It is shown that the use of this law for calculating heat transfer of a torch (a gaseous source of radiation) in heating furnaces and power-generating installations leads to incorrect results. It is substantiated that there is crisis of methods for calculating heat transfer in torch furnaces and power-generating installations. Geometrical and physical torch models in the form of radiating cylindrical gas volumes as sources of heat radiation are proposed for overcoming this crisis. © 2014 Pleiades Publishing, Inc.


Izmailov V.V.,Tver State Technical University
Journal of Friction and Wear | Year: 2014

The mathematical model of discrete contact between real engineering surfaces has been proposed. The model takes into account the adhesion between surfaces in contact. The analytical expressions for calculating the deformation of a contact and the real (physical) contact area have been obtained. The dimension-less criterion for estimating the influence of adhesive forces on the contact characteristics has been proposed. The effect of various factors on the above characteristics has been analyzed. It has been shown that, at the nanoscale level (asperities of nanoscale size), especially under low contact loads, the influence of adhesive forces is significant. © 2014, Allerton Press, Inc.


Makarov A.N.,Tver State Technical University
Power Technology and Engineering | Year: 2016

Asolution is given to the problem of heat transfer in the firebox of a steam boiler, taking account of the radiation from all quadrillions of atoms constituting the flare. An innovative firebox for a steam boiler is proposed: the lower part of the firebox is a rectangular parallelepiped and the upper part a four-sided pyramid. The calculations show that in the proposed firebox the nonuniformity of the heat-flux distribution is diminished along the height and perimeter of the walls and nitrogen oxide emissions are reduced. © 2016, Springer Science+Business Media New York.


Makarov A.N.,Tver State Technical University
Power Technology and Engineering | Year: 2015

Radiation from large cylindrical gas volumes is studied as a means of simulating the flare in steam boiler furnaces. Calculations of heat exchange in a furnace by the zonal method and by simulation of the flare with cylindrical gas volumes are described. The latter method is more accurate and yields more reliable information on heat transfer processes taking place in furnaces. © 2015, Springer Science+Business Media New York.


Zubchaninov V.G.,Tver State Technical University
Mechanics of Solids | Year: 2011

Mechanics of processes of elastoplastic deformation of continua was developed at the turn of the 1950s by the prominent mechanical scientist, Corresponding Member of the USSR Academy of Sciences and the Russian Academy of Sciences, Professor of Moscow State University, A. A. Il'yushin, and was further developed in the 1990s and later. One unsolved problem in process theory has been the hypothesis of complex unloading of media and materials. In the present paper, we discuss various lines of attack on this important fundamental problem in the theory of plasticity. © 2011 Allerton Press, Inc.

Loading Tver State Technical University collaborators
Loading Tver State Technical University collaborators