204 research outputs found
John F. Sonnett Memorial Lecture Series: The Constitution is Alive and Well
No full textAudio cassette recording of The Constitution is Alive and Well, delivered by Hon. Sol M. Wachtler of the New York Court of Appeals (1985-1992) at Fordham University School of Law. Recording stops mid-sentence
Extending the scope of a known furan synthesis - A novel route to 1,2,4-trisubstituted pyrroles
No full text2-(Acylmethylene)propanediol diacetates, which cyclize readily under acidic conditions to give furans (76-84%) react with primary amines under palladium catalysis to give 1,2,4-trisubstituted pyrroles in moderate to good yields (39-53%). When glycine methyl ester is used as the amine, substituted methyl pyrrol-1-ylacetates (31-82%) are obtained
Extending the scope of a known furan synthesis - A novel route to 1,2,4-trisubstituted pyrroles
No full text2-(Acylmethylene)propanediol diacetates, which cyclize readily under acidic conditions to give furans (76-84%) react with primary amines under palladium catalysis to give 1,2,4-trisubstituted pyrroles in moderate to good yields (39-53%). When glycine methyl ester is used as the amine, substituted methyl pyrrol-1-ylacetates (31-82%) are obtained
Nanotechnology for the progress of lithium batteries R&D
No full textIn this paper we report the strategy followed in our laboratories for the progress of lithium ion batteries. The results show that nanotechnology is a very promising tool for achieving breakthrough in electrode and electrolyte materials. The concept is demonstrated for the cases of metal storage and metal oxide anodes, phospho olivine lithium iron phosphate cathodes and solvent-free, poly(ethylene oxide)-based polymer electrolytes. (C) 2003 Elsevier B.V. All rights reserved
A study on PVdF-based SiO2 - containing composite gel-type polymer electrolytes for lithium batteries
No full textSeveral gel membranes of the type PVdF/EC-PC/SiO 2 without and with electrolyte salts have been characterised by vibrational spectroscopy and by galvanostatic cycling tests. It is found that the structure of the PVdF matrix in the membranes depends on the gel composition and preparation conditions. At high loads of polymer parts of the PVdF chains assume a TGTG\u27 conformation typical of the so-called "structural form II". The formation of PVdF of form II is favoured when slow cooling rates are employed during the membrane preparation. In galvanostatic cycling tests in combination with a Sn/SnSb electrode, the present gel-type polymer electrolytes give results comparable to those obtained with the corresponding liquid electrolytes. \ua9 2004 Elsevier Ltd. All rights reserved
Unterstützung von videobasiertem Unterricht durch Interaktionen - Implementierung eines ersten Prototyps
No full textVideos sind meist reine Konsumationsmedien ohne weitere Interaktion. Aus diesem Grund wird eine Web-Anwendung entwickelt, welche es ermöglicht, verschiedene Formen der Interaktion und Kommunikation während dem Betrachten eines Videos bereitzustellen. Dies soll den Teilnehmerinnen und Teilnehmern helfen, den sogenannten "Berieselungseffekt" zu vermeiden. Die bzw. der Vortragende sollte mit Hilfe der Interaktionen feststellen können, ob die Teilnehmer/innen die Lerninhalte verstehen. Die entwickelte Web-Anwendung bietet unter anderem die Möglichkeit, Multiple-Choice-Fragen zu bestimmten Zeitpunkten in das Video einzubetten. Außerdem stehen viele Analysemöglichkeiten wie zum Beispiel ein genaues Aufmerksamkeitsprofil zur Verfügung. Eine erste Evaluation zeigt eine rege Teilnahme an den Interaktionen.
24.04.2014 | Josef Wachtler & Martin Ebner (Graz
Electrochemical Behaviour of Sn and Sn-C Composite in LiBOB-Containing Electrolytes
No full text2010, IMLB Meeting, Montreal, Canada, June27-July2 ads.#5
A safe, low-cost, and sustainable lithium-ion polymer battery
No full textA polymer lithium-ion battery, formed by a Li4/3Ti5/3O4- LiFePO4 electrode combination and a poly(vinylidene fluoride) (PVdF)-based gel electrolyte, is presented and discussed. The electrochemical characterization demonstrates that this battery is capable of delivering appreciable capacity values at rates ranging from C/32 (160 mAh g(-1)) to 0.75C (130 mAh g(-1)), this being accompanied by a remarkable cycle life. In addition, because the two electrodes are based on common and nontoxic materials and operate within the stability window of the electrolyte, the battery is expected to be safe, inexpensive, and compatible with the environment. All these properties make the battery of prospective interest for application in the hybrid and electric vehicle field. (C) 2004 The Electrochemical Society
- …
