Time filter

Source Type

Wroclaw, Poland

Wrocław University of Technology is an autonomous technical university in Wrocław, Poland. With buildings dispersed throughout the city, its main facilities are gathered at a central location near Plac Grunwaldzki, alongside the Oder River. It operates three regional branches in Jelenia Góra, Legnica, and Wałbrzych. Wikipedia.

Bizet V.,RWTH Aachen | Kowalczyk R.,Wroclaw University of Technology | Bolm C.,RWTH Aachen
Chemical Society Reviews | Year: 2014

The interest in fluorinated sulfoximines has rapidly increased over the past twenty years. As sulfoximines are analogues of sulfones where one of the two SO units has been replaced by an SN moiety, they can confer new reactivities and properties never observed for the respective sulfones. In this tutorial review, we present the specific properties of fluorinated sulfoximines (including important bioactivities) and describe the syntheses and the applications of fluoromethyl transfer agents such as Johnson's reagent. Furthermore, we highlight the exceptional electronic effects induced by the presence of strongly electron-withdrawing fluoro-bearing sulfonimidoyl moieties, which allowed the development of remarkable super-acidifiers and super-acceptors with relevance in materials sciences. This journal is © the Partner Organisations 2014. Source

Wojaczynska E.,Wroclaw University of Technology | Wojaczynski J.,Wroclaw University
Chemical Reviews | Year: 2010

Various achievements in the field of enantioselective synthesis of sulfoxides in years 2000-2009 are compiled. A series of (4-X-benzyl) p-tolyl sulfoxides was prepared in both enantiomeric forms using the Andersen method. Diastereomers of S-oxidized N-protected S-methyl or S-propyl-L-cysteine methyl ester were prepared using the DAG methodology and was found that the diastereomeric ratio is stongly dependent on the combination of solvent and base. While identifying the best method for the preparation of nonracemic modafinil derivatives, it was found that chiral oxaziridines give better results than metal-based systems. Studies on the sulfoxidation of the series of 2-arylsulfanylpyrroles demonstrated that the synthetic Kagan and Modena protocols could be applied with success if the electron-withdrawing groups differentiated the two substituents of the sulfur atom. Source

Trapko T.,Wroclaw University of Technology
Materials and Design | Year: 2013

This paper discusses outcomes of experimental research into FRCM (Fibre Reinforced Cementitious Matrix) and CFRPs (Carbon Fibre Reinforced Polymers) confined concrete elements. FRPs (Fibre Reinforced Polymers) composite materials use epoxy resin to bond concrete with external composite reinforcement, whereas FCRM uses composite jacket embedded in mineral mortar. Since mineral adhesive is used for FRCM composites, they are an alternative to FRP composites for applications in elevated temperatures. The two-stage comparative research was carried out to evaluate the confinement effectiveness and behaviour of FRCM and CFRP confined concrete elements. At the first stage, the effect of different number of transverse reinforcement layers of FRCM and CFRP sheets not exposed to elevated temperature was investigated. At the second stage, elements with single layer transverse reinforcement of FRCM and CFRP sheets was exposed to elevated temperature and then tested to failure. This paper reviews results of limit load capacity research, damage patterns were described and stress-strain curves were plotted and compared for both confinement types. © 2012 Elsevier Ltd. All rights reserved. Source

Budzianowski W.M.,Wroclaw University of Technology
Energy | Year: 2012

Carbon-based energy vectors can use existing energy infrastructures and can serve all energy applications including transport. The review analyses how carbon-based energy vectors can be made suitable for design of low CO 2 intensive and cost-effective energy systems. For this purpose several interesting carbon management technologies which well integrate and add value to energy technologies are expounded. It is shown that energy systems involving carbon-based vectors can achieve very low CO 2 intensity when they use energy mix of carbon positive and carbon negative technologies. The focus of the study is on promising carbon management technologies which can achieve: (i) minimised atmospheric CO 2 emissions by sources and/or (ii) maximised CO 2 removals from the atmosphere by sinks. Further, the opportunities for integration of value-added carbon management technologies into fossil fuel, biomass and renewable energy technologies are discussed. In summary, perspectives and constraints of energy technologies integrated with value-added carbon management are expounded. © 2012 Elsevier Ltd. Source

Budzianowski W.M.,Wroclaw University of Technology
Renewable and Sustainable Energy Reviews | Year: 2012

The article investigates prospects and challenges for expanding of sustainable biogas energy in Poland. The number of Polish biogas fuelled power plants and installed electrical power during the 2001-2010 decade is presented. Current economical incentives for biogas energy are discussed. It is emphasized that some revisions to the Polish tradable certificate system are urgently needed in order to encourage energy crop cultivation and the use of best available power technologies. Further, promising, but mostly unexplored feedstocks, such as energy crops, grasses and sorted municipal organic wastes are analyzed. It is also revealed that agrobiogas is characterized by a unique feature of 'negative net' CO2 atmospheric emissions and thus the role of agrobiogas in solving Polish CCS dilemmas is discussed. In regard to biogas energy systems it is stressed, that the cost of electricity from biogas is almost independent on the size of agrobiogas CHP power plants in the range of 0.2-5 MWe. Therefore agrobiogas energy is well suited for distributed energy systems involving small-scale agrobiogas power plants offering more green jobs and improved local waste management characteristics. Finally, reliable technologies suitable for biogas energy conversion and upgrading of biogas fuel to marketable gaseous fuels are briefly characterized. © 2011 Elsevier Ltd. All rights reserved. Source

Discover hidden collaborations