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1
Content available remote Tractability of multi-parametric Euler and Wiener integrated processes
Lifshits M. A., Papageorgiou A., Woźniakowski H.
Probability and Mathematical Statistics
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2012
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Vol. 32, Fasc. 1
131--165
EN
We study average case approximation of Euler and Wiener integrated processes of d variables which are almost surely rk-times continuously differentiable with respect to the k-th variable and 0 ≤ rk ≤ rk+1. Let n(ε; d) denote the minimal number of continuous linear functionals which is needed to find an algorithm that uses n such functionals and whose average case error improves the average case error of the zero algorithm by a factor ε. Strong polynomial tractability means that there are nonnegative numbers C and p such that [formula]. We prove that the Wiener process is much more difficult to approximate than the Euler process. Namely, strong polynomial tractability holds for the Euler case iff ...[formula]. Other types of tractability are also studied.
2
Content available Dehydrogenation of propane with CO2 - a new green process for propene and synthesis gas production
Michorczyk P., Zeńczak K., Niekurzak R., Ogonowski J.
Polish Journal of Chemical Technology
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2012
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Vol. 14, nr 4
77-82
EN
Dehydrogenation of propane in the presence of CO2 was considered as an alternative to commercial dehydrogenation pathway of obtaining propene and the new sources of synthesis gas. Based on thermodynamic calculations and a catalytic tests it was shown that by controlling CO2 concentration in the feed the molar ratio of H2/CO (synthesis gas) in the products mixture can be regulated. Several different pathways of DHP-CO2 process integration with commercialized chemical processes utilized synthesis gas were proposed.
3
Content available Reaktywna ekstrakcja kwasów karboksylowych z zastosowaniem dwutlenku węgla w stanie nadkrytycznym
Djas M., Henczka M.
Inżynieria i Aparatura Chemiczna
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2012
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Nr 6
310-311
PL
W pracy przedstawiono wyniki badań doświadczalnych przebiegu procesu reaktywnej ekstrakcji kwasu cytrynowego z roztworu wodnego z użyciem dwutlenku węgla w stanie nadkrytycznym. Zbadano wpływ parametrów procesowych (temperatury, szybkości mieszania, czasu realizacji) na przebieg i efektywność procesu. Wyniki badań doświadczalnych prowadzonych z zastosowaniem dwutlenku węgla w stanie nadkrytycznym porównano z wynikami otrzymanymi przy użyciu rozpuszczalników organicznych: 1 -oktanolu i n-heptanu.
EN
In this paper the results of experiments of reactive extraction of citric acid from aqueous solution with the use of supercritical carbon dioxide are presented. The influence of process parameters (temperature, stirrer speed, time) on the process course and efficiency was investigated. The results of experiments obtained with the use of supercritical carbon dioxide were compared with those obtained using organic solvents: 1-octanol and n-heptan.
4
Content available The supply chain management and operations as key to future competitiveness for research, development and manufacture of new vehicles
Galarza J.
Journal of KONES
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2011
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Vol. 18, No. 3
91-98
EN
The future production of new types of transportation for land, sea and air, based mainly on research, development and innovation in new materials and new types of energy according to environmental standards, will be very difficult unless they are structured around their advanced concept development through relationships management between all actors in a supply chain for manufacturing and distribution. The future of design and development of new vehicles also must incorporate innovative models for the supply chain Management, composed of key business processes that cut across the global supply chain and where the critical success factor is the degree of integration of these processes between customers and suppliers throughout the value chain, linking all actors involved in research and development, prototyping, manufacturing, marketing and aftersales. The future of the new products will also depend on efficient and competitive processes, so it will be essential to design an information management and product flow throughout the supply chain, closely linking the processes of customer relationship Management, suppliers management, order fulfilment, flow manufacturing in a Lean environment and research, development and innovation to the merchandising of the new products. In the future, we need perfect plants for the production of new vehicles and will depend on the degree of efficiency and profitability across different supply chains, this is, the competence won't be between companies, but between supply chains, and if we design an efficient and competitive chain from the same initial development, then will have lasting, safer and greener new vehicles.
5
Content available Zintegrowany proces produkcji wodoru przez konwersję metanu parą wodną z równoczesną sorpcją CO2
Molga E., Cherbański R.
Inżynieria i Aparatura Chemiczna
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2010
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Nr 3
73-74
PL
Przedstawiono koncepcję produkcji wodoru z jednoczesną sekwestracją C02. Do praktycznej realizacji zaproponowano zastosowanie zintegrowanego procesu adsorpcji reaktywnej. Jako adsorbent, zaproponowano wykorzystać popioły lotne, które stanowią użyteczny odpad z elektrowni i elektrociepłowni. Koncepcja ta umożliwi wyeliminowanie technologicznych problemów związanych z regeneracją adsorbentu, a jednocześnie poprzez trwałe związanie CO2 zapewni ograniczenie emisji tego gazu do atmosfery.
EN
Idea of hydrogen production with simultaneous CO2 sequestration is presented in the paper. The application of the integrated reactive adsorption process is proposed. The use of fly ashes from power plants as well as from combined power and heat plants are recommended for this purpose. This idea helps to eliminate technological problems with adsorbent regeneration and simultaneously to reduce the C02 emission to atmosphere.
6
Modelowanie procesów adsorpcji reaktywnej z wykorzystaniem momentów statystycznych
Molga E., Ciach M.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
161-162
EN
In the paper a general model of the reactive adsorption process has been elaborated. An analysis of this process, which employs the statistical moment theory, has been carried out and presented. Based on this method, an influence of operating conditions as well as parameters of elementary processes on the efficiency of entire process has been quantitatively estimated. This makes possible discussion of the process efficiency and its optimization.
7
Model pierścieniowego reaktora chromatograficznego
Molga E., Lewak M., Ciach M.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
163-164
EN
In the paper integrated process of reactive chromatography carried out in an annular chromatographic reactor has been described. The mathematical model of this reactor containing differential balance equations for reactants in the mobile as well as stationary phase has been also elaborated. On the basis of numerical simulations, an influence of the operation variables as well as system properties on the process efficiency has been estimated.
8
Integracja procesów chemicznych : reaktory wielofunkcyjne
Molga E.
Inżynieria i Aparatura Chemiczna
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2006
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Nr 6s
159-160
EN
In the paper multifunctional reactors, which are a practical implementation of the concept of chemical processes integration are presented. A general classification and characteristics of multifunctional reactors employed to execute the reactive separation processes have been given. Adsorptive and chromato-graphic reactors have been chosen to present and discuss main advantages and difficulties of reactive separation processes.
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