Search results for "pendant"

1987

X-ray measurements of stretched crosslinked liquid-crystalline side group polymers show that two types of orientation of the mesogenic groups relative to the polymer chains (parallel or perpendicular) are possible, depending on the structure of the polymer chain. For two liquid-crystalline polymethacrylates with long spacer groups (6 methylene units) the mesogenic groups orient preferably perpendicularly to the polymer chains (axis of strain). For three liquid-crystalline polyacrylates with long or short spacer groups (6 or 2 methylene units), the mesogenic groups orient preferably parallel to the polymer chains (axis of strain). The reason for this difference is not yet clear. These result…

1992

The synthesis and the results of the structural study of two copolysiloxanes with laterally fixed trinitrofluorenone (TNF) units is reported. The two copolysiloxanes having 2,4 (1a) and 5,3 (1b) dimethylsiloxane comonomer units per TNF side group differ significantly in their phase behaviour as evident from optical microscopy, differential scanning calorimetry and X-ray scattering: 1b shows a nematic mesophase whereas 1a is an amorphous material. The different phase behaviour is discussed in terms of microphase separation between the siloxane backbone and TNF side groups.

Synthesis, characterization and magnetic study of two new octahedral iron(III) complexes with pendant zwitterionic Schiff bases

2016

Two Schiff bases, HL1 [2-((3-(dimethylamino)propylimino)methyl)-5-bromophenol] and HL2 [2-((2-(diethylamino)ethylimino)methyl)-6-methoxyphenol], have been employed to prepare two new octahedral iron(III) complexes, [Fe(HL1)2(N3)2]ClO4·2H2O (1) and [Fe(HL2)2(NCS)2]ClO4·H2O (2). Both complexes are characterized by spectral and elemental analyses. Single crystal X-ray diffraction studies confirm their structures. In both complexes, Schiff bases are trapped in their zwitterionic forms and coordinated to iron(III) only through the imine nitrogen and phenoxo oxygen, i.e., they behave as bi-dentate ligands, keeping the remaining potential donor sites pendant. The measurement of χM vs. T for both c…

Les usages de l'humour en situation de crise politique : l'exemple du processus séparatiste catalan

2020

International audience

Uchwała Sądu Najwyższego składu 7 sędziów - Izba Pracy, Ubezpieczeń Społecznych i Spraw Publicznych z dnia 26 kwietnia 2017 r., III UPZ 1/17 Glosa - …

2018

Optical and electrical properties of oriented thin films of oligomer containing betaine-type moiety in side chain

2005

Non-linear optical and electrical properties of polymer films obtained by dipole orientation of active units are reported. Novel polar oligomer with N-(indan-1,3-dion-2-yl)pyridinium betaine (IPB) as a side group is studied. Orientation of polar groups in oligomer thin films causes an increase of the photo-induced change of surface potential on irradiation in the region of photo-induced electron transfer (PIET) where the IPB group exhibits a reversible change of the value and sign of the dipole moment. At longer wavelengths, the value of the surface potential of the oligomer may be determined by transport of photogenerated charge carriers.

Semi-blind Source Extraction Methods: Application to the measurement of non-contact physiological signs

2018

Non-contact physiological measurements are highlydesirable in many biomedical fields such asdiagnosis of infants, geriartic patients, patients withextreme physical trauma, and fitness and well-being.Remote photoplethysmography is increasingly beingused for non-contact measurement of heart rate fromvideos which is one of the most common biomedicalproperty required for most medical diagnosis. Oneof the common techniques for performing remotephotoplethysmography involves using Blind SourceSeparation (BSS) methods to extract the cardiacsignal from video data.In this context, the objective of this thesis is todevelop different methods in the field of extractionand separation of sources by improv…

Leukocytapheresis in patients with moderate-severe steroid-dependant ulcerative colitis: Clinical Response without Endoscopic Response

2006

Le processus souverainiste en Catalogne : entre crise institutionnelle et impasse politique

2017

Cet article interroge les facteurs qui ont conduit, à partir de 2010, à une radicalisation des revendications indépendantistes en Catalogne et à une situation de quasi-blocage institutionnel à travers une analyse des discours politiques des exécutifs catalan et madrilène et des nouveaux modes d'activité protestataire mis en place par la société civile. La complexité de cette crise qui pose le problème des limites du cadre constitutionnel de 1978 implique de prendre en compte les interactions qui se créent entre la sphère politique et la société civile au cours de ce cycle de mobilisations. La réflexion s'oriente donc à la fois sur les arguments convoqués dans le discours institutionnel mais…

Processus de transformation et consolidation identitaires dans les sociétés européennes et américaines aux XXe et XXIe siècles

2020

International audience