1,520 research outputs found
Corrosion and stability of vitrified material derived from municipal solid waste
No full textAdvanced high-temperature technologies for the treatment of municipal solid wastes or residues from conventional incineration can produce vitrified materials with superior physical and chemical characteristics compared to conventional residues (bottom ash, fly ash, filter cake). These materials, which may contain significant metal concentrations, exhibit favourable thermodynamic characteristics and very low contaminant release when subjected to corrosion. Owing to low leachability, these materials could possibly be used as secondary raw materials for civil engineering applications, although the energy demand for their production is high. This chapter presents the physical and chemical characteristics of a range of vitrified materials originating from various high-temperature technologies; their behaviour under highly aggressive conditions of corrosion and their thermodynamic stability are also presented. It is concluded that such high-temperature materials are indeed less likely to be damaging to the environment than conventional residues
Identifying the origins of local atmospheric deposition in the steel industry basin of Luxembourg using the chemical and isotopic composition of the lichen Xanthoria parietina
No full textTrace metal atmospheric contamination was assessed in one of the oldest European industrial sites of steel production situated in the southern part of the Grand-Duchy of Luxembourg. Using elemental ratios as well as Pb, Sr, and Nd isotopic compositions as tracers, we found preliminary results concerning the trace metal enrichment and the chemical/isotopic signatures of the most important emission sources using the lichen Xanthoria parietina sampled at 15 sites along a SW-NE transect. The concentrations of these elements decreased with increasing distance from the historical and actual steel-work areas. The combination of the different tracers (major elements, Rare Earth Element ratios, Pb, Sr and Nd isotopes) enabled us to distinguish between three principal sources: the historical steel production (old tailings corresponding to blast-furnace residues), the present steel production (industrial sites with arc electric furnace units) and the regional background (baseline) components. Other anthropogenic sources including a waste incinerator and major roads had only weak impacts on lichen chemistry and isotopic ratios. The correlation between the Sr and Nd isotope ratios indicated that the Sr–Nd isotope systems represented useful tools to trace atmospheric emissions of factories using scrap metal for steel production
Dolomite formation in pelagic limestone and diatomite, Romanche fracture zone, Equatorial Atlantic
No full textDe Stille Kracht & Metamorfoze: Renovatie van de Couperusbuurt
No full textRenovatieontwerp voor de duplexwoningen in de vroeg-naoorlogse Couperusbuurt in Amsterdam Nieuw-West. Aan de hand van twee ontwerpen worden de diverse mogelijkheden van renovatie getoond. 'De Stille Kracht' benadrukt de jaren '50 kwaliteit van de buurt en versterkt dit in de architectuur. Bij 'Metamorfoze' staat duurzaamheid centraal en worden de woningen energiezuiniger en comfortabeler gemaakt.Transforming Housing HeritageRMITArchitecture and The Built Environmen
The stille reaction, 38 years later
No full textProducción CientíficaThe first now named Stille reaction was published 38 years ago, and
the last comprehensive revision of this catalysis was in 2004. Since then the
knowledge of the different steps of the three possible (and sometimes competing)
reaction pathways (cyclic, open, and ionic) has been almost completed by synergistic
experimental and theoretical studies: the Stille reaction is perhaps the best characterized
catalytic process if we consider the number of intermediates that have
been detected. This review concentrates on the mechanistic new knowledge, and
on important aspects as the revolution with the use of bulky phosphines, the bimetallic
alternative of the Stille reaction, the enantioselectivity in Stille and palladium
free Stille processes, the meaning of copper effect, or the possible approaches to
make Stille coupling a greener process.Junta de Castilla y León (programa de apoyo a proyectos de investigación – Ref. GR 169 and VA256U13)Ministerio de Economía, Industria y Competitividad (CTQ2013-48406-P
Rapid fluorous Stille coupling reactions conducted under microwave irradiation
No full textPalladium-catalyzed fluorous Stille cross-coupling reactions with organic halides or triflates require only 90-120 s for completion when conducted under microwave irradiation. Comparable thermal reactions require about 1 day. Fourteen different coupling products were synthesized and isolated in good yields after three-phase extraction (FC-84, dichloromethane, water) and chromatography. The examples extend the scope of the fluorous Stille coupling with respect to both the tin and halide/triflate components. Applications in parallel synthesis are suggested.</p
Stille Liebe zu Beethoven. English
No full textTranslation of Eine stille Liebe zu Beethoven. Previously issued in English under title: An unrequited love. --- The author's name is given in the introduction. --- "Beethoven's Grabgesang": p. 248-250
DE STILLE RESERVE EN DE NEDERLANDSCH INDISCHE FISCUS
No full textDE STILLE RESERVE EN DE NEDERLANDSCH INDISCHE FISCU
Stille Couplings Catalytic in Tin: A “Sn−F” Approach
No full textA new tin recycling method for Stille couplings catalytic in tin is reported. PMHS made hypercoordinate by KF(aq) allows Me3SnH to be efficiently
recycled during a Pd(0)-catalyzed hydrostannation/Stille cascade. Relative to previously disclosed protocols, reaction times are shorter and
because this process is believed to proceed through a Me3SnF intermediate the hazards and problems associated with trimethyltins are also
diminished
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