Search results for "Solid"
showing 10 items of 3575 documents
On/Off Photoswitching in a Cyanide-Bridged {Fe2Co2} Magnetic Molecular Square
2013
International audience; A repeatable bidirectional paramagnetic ↔ diamagnetic photomagnetic effect has been observed in the cyanide-bridged Fe-Co square complex {[Fe{B(pz)(4)}(CN)(3)](2)[Co(bik)(2)](2)}(ClO(4))(2)*3H(2)O [B(pz)(4) = tetrapyrazolylborate, bik = bis(1-methylimidazol-2-yl)ketone]. Magnetic measurements and low-temperature single-crystal X-ray diffraction experiments have shown that a complete electron transfer from the diamagnetic Fe(II)-Co(III) state to the paramagnetic Fe(III)-Co(II) metastable state is induced by 808 nm laser light irradiation, whereas the diamagnetic state is recovered in an almost quantitative yield under irradiation at 532 nm.
Nanowire iron(III) coordination polymer based on 1,2,4-triazolo[1,5-a]pyrimidine and chloride ligands
2019
Abstract The neutral ligand 1,2,4-triazolo[1,5-a]pyrimidine (tp) has been employed to prepare a new coordination compound of Fe(III), [FeCl3(tp)2]n (1). Compound 1 was investigated by single crystal X-ray diffraction and found to be a coordination polymer forming a ladder structure based on metal–ligand interactions, while H-bonding and aromatic interactions contribute to the supramolecular self-assembly into a 3D nanostructured material. The polymeric assembly is retained also in solution, where a metallo-supramolecular polymer based on coordinative metal–ligand binding is present, as shown by dynamic light scattering (DLS) measurements. The redox properties of the Fe(III) coordination pol…
Synthesis, reactions and structural features of monofluorinated cyclopropanecarboxylates
2002
Abstract Monofluorinated cyclopropanecarboxylates are available in racemic or optically active form by transition metal-catalyzed reactions of vinylfluorides with diazoacetates. From α-fluorostyrene and tert-butyl diazoacetate in the presence of 2 mol% of an enantiopure bis(oxazoline) copper complex, a 81:19 mixture of tert-butyl trans- and cis-2-fluoro-2-phenylcyclopropanecarboxylates was obtained with high enantiomeric excess (ee) of 93 or 89%, respectively. The corresponding racemic ethylesters were used as starting materials for the synthesis of carboxamides, of the cis- and trans-isomers of analogues of tranylcypromine, an anti-depressive drug and several of its homologous fluorinated …
Exploring Organized Interests in Post-Communist Policy-Making: The "Missing Link"
2021
This book examines organized interests in post-communist Central and Eastern Europe (CEE), providing incisive analyses in three critically important policy areas - healthcare, higher education and energy. The four countries surveyed – Poland, Hungary, Slovenia and the Czech Republic – afford rich diversity offering broad empirical material available for cross-country and cross-policy comparative analyses. Featuring interdisciplinary research, the book draws together recent developments in the evolution of post-communist advocacy organizations, their population ecology dynamics, interest intermediation, the influence of organized interests and their (bottom-up and top-down) Europeanization. …
Prawda czasu, prawda ekranu. Przełom solidarnościowy 1980-1981 w polskich filmach (na wybranych przykładach)
2016
Celem tekstu jest analiza tak zwanego karnawału ruchu „Solidarności” (1980-1981) w polskich filmach (na wybranych przykładach). Do chwili obecnej najważniejszym jego obrazem jest „Człowiek z żelaza” Andrzeja Wajdy, stanowiący kamień milowy w polskim kinie i będący częścią mitologii solidarnościowej. Inne filmy próbują doń nawiązywać lub go naśladować, co z reguły przynosi wątpliwe rezultaty. Demitologizację „Solidarności” omawia się na przykładzie „Psów” Władysława Pasikowskiego, których głównym bohaterem jest były funkcjonariusz policji politycznej z epoki komunizmu. Telewizyjny dokument „Solidarni 2010” w reżyserii Ewy Stankiewicz i Jana Pospieszalskiego to próba ponownej mitologizacji „S…
The Keeper of the Salt. Hidden economy and clash of jurisdiction in the Valley of Cofrentes in the mid XVIIIth Century
2006
La muerte violenta de un guardia de la real renta de salinas en un barranco de Cofrentes, en febrero de 1747, puso al descubierto la existencia de una fábrica clandestina y de una red de contrabando de sal que abastecía a numerosos conventos valencianos. Dos factores coyunturales propiciaron su aparición: las dificultades de suministro de uno de los principales alfolíes reales y el impuesto extraordinario fijado sobre el precio de la sal con motivo de la guerra de Sucesión austríaca. Pero, al margen de ello, el caso revela las carencias estructurales del aparato de vigilancia y las contradicciones entre los distintos ámbitos jurisdiccionales implicados, que hicieron posible la articulación …
Polish Yellow Sweet Clover (Melilotus officinalis L.) Honey, Chromatographic Fingerprints, and Chemical Markers
2017
A case study of Polish Melilotus officinalis honey was presented for the first time. Gas chromatography–mass spectrometry (GC-MS) (after steam distillation, Soxhlet extraction, ultrasonic solvent extraction, and solid phase extraction (SPE)) and targeted high performance liquid chromatography with a photodiode array detector (HPLC-PAD) were applied to determine the characteristic components of honey. While ubiquitous in most honeys, carbohydrates, terpene derivatives, and phenylacetic acid dominated in the Soxhlet extracts (25.54%) and in the application of SPE (13.04%). In addition, lumichrome (1.85%) was found, and may be considered as a marker of this honey. Due to the presence of these …
Chromatographic fingerprint, antioxidant activity, and colour characteristic of polish goldenrod (Solidago virgaurea L.) honey and flower
2018
In recent times, the nutraceutical and pharmaceutical interest in honey due to its well-known health properties has increased. Consumers need clear and precise information, so that they can make informed choices about their diet and the foods they buy. Therefore, gas chromatography–mass spectrometry (GC–MS) and high-performance liquid chromatography with a photodiode array detector (HPLC-PAD) was revealed a general characteristic fingerprint of polish monofloral goldenrod honey and flowers. In addition, high-performance thin-layer chromatography (HPTLC) has proven to be a useful tool for determining similarity patterns of common bands among honey from the same floral source and thus can be …
Contactless magnetic excitation of acoustic cavitation in liquid metals
2015
A steady axial magnetic field is applied to a liquid metal zone heated by induction currents. The resulting alternating Lorentz force causes pressure oscillations that being strong enough lead to cavitation in the molten metal. Amplitude of the pressure oscillations is proportional to the product of the induced currents and the steady axial magnetic field induction. We follow an approach where the acoustic pressure is maximized by the induction currents. The onset of cavitation is identified by the occurrence of sub-harmonics of the drive frequency in sound recorded at the surface of the experimental cell. It is demonstrated that cavitation in a liquid metal may be excited by a superimposed…
Synthetic environmental appraisal of waste management system: an application to the Sicilian region
2004
This paper addresses the problem of synthetically evaluating the environmental performances of urban solid waste systems. This, in fact, represents a crucial point in the management process of complex systems that local administrations are called to cope with, in order to provide decisions about policy options that involve different issues characterising the quality of life of people. Suitable methods of evaluation are clearly required for this aim. This work introduces the dashboard of sustainability and the ecological footprint approaches as aggregate indicators of the performances of solid waste management systems. The methods have been selected due to their intrinsic simplicities, provi…