Search results for "complex"
showing 10 items of 5889 documents
Iron (II) isothiocyanate complexes with substituted pyrazines: Experimental and theoretical views on their electronic structure
2015
Abstract Synthesis, structural, magnetic, Mossbauer and thermal studies of isothiocyanate iron (II) complexes with substituted pyrazines (iodo-, bromo- and amino-derivatives) are discussed here. Complexes with iodo- and bromo-derivatives were found to have the composition [Fe(Ipz)2(SCN)2(H2O)2]·2Ipz (1) and [Fe(Brpz)2(SCN)2(H2O)2]·2Brpz (2), whereas in the case of amino-functionalized pyrazine the formation of [Fe(NH2pz)4(SCN)2] (3) was observed. 3D organization of the molecular complexes is stabilized within different hydrogen, halogen and lone pair–π interactions. Spin state of iron (II) ions in 1–3 was determined as high spin by Mossbauer and magnetic measurements. DFT calculations for t…
Polyamines : études et applications
2008
International audience
Revisiting the role of embedding in Systemic Functional Linguistics : Construing depth in “big texts”
2021
This paper is concerned with exploring the role of embedded genres in expanding the meaning potential of long texts, focusing especially on complex tertiary assignments. A significant body of work has evolved in Systemic Functional Linguistics (SFL) on modelling “big texts” as macrogenres since Martin (1994: 29) posed the question how texts “get bigger than a page”. However, based on detailed genre analyses of high-scoring undergraduate business country reports, this paper illustrates that not all big texts are macrogenres made up of elemental genre complexes. Analogising from clause grammar, it will show that these texts unfold through multiple layers of embedded genres in their generic st…
Complexity and Action. A Cybernetics Perspective to Decision Making - Plenary Lecture
2013
The problem often faced by some approaches to complexity is that of the abstraction from the competition character of action. Man often is not rational, because of his cognitive limits, his heuristics of thought, and his passions of which the most dangerous is fear. To be aware that the world is complex and there is no way to forecast the future is something that can scare at the point to inhibit decision and necessary action. Today there is a lot of talking about how the world, hence the markets, the social and business environment is complex, but few real proposals about what to do. The temptation coming from reductionist models and the reason why they are still so strong in the manageria…
Consulting of the XXI Century. Coping with Complex Business Systems
2011
The increase of the social and economic complexity causes frequent discontinuities and the rapid change of the business environment, triggering intense transformations of the competitive logics and of the capability of forecasting using traditional models. The new competitive reality is characterized by dynamism, connectivity, non–linearity and emergent properties, in other words by “complexity”. The XX century’s myth of the “one best way” reveals its weaknesses and its inability to deal with the new emerging problems and opportunities, which, at the beginning of the XXI century, fIrms have to face. The traditional reductionist concept of “one best way”, based on the “replication of standar…
Complex composite structures with integrated piezoelectric transducers
2016
International audience; Nowadays, in different industrial fields as transport or aerospace, a research effort is conducted to reduce the structural weight. One of the most promising solutions is the use of composite structures due to their high stiffness, their low mass density and their low damping factor. At the same time, there is an intensification of the operational dynamic environment and an increase of durability requirements. These different expectations seem to be contradictory. One solution to manage these points is to design and manufacture smart composite structures with a fully distributed set of integrated piezoelec-tric transducers. These structures are able to modify their m…
Una relación dialógica improbable: Edgar Morin/Heinrich Schenker. Hacia una teoría de la complejidad para el sistema tonal.
2009
La presente tesis toma como referencia principal el paradigma de la Complejidad deEdgar Morin y las teorías de Heinrich Schenker. Como emergencia del sistema humanomente/cerebro, el Arte en general y la música en particular son considerados desde la perspectivade las organizaciones de nuestro universo. Así, todos los acontecimientos/eventos que seproducen en el interior/exterior de una composición tonal, lo hacen en función de suantagonismo y complementariedad, siempre de forma concurrente, tal y como articula lasnociones Edgar Morin, consiguiendo superar, a través de la noción de bucle, la dicotomíaoccidental.En las teorías tradicionales de la música, lo descriptivo, lo lineal y lo determi…
Probabilistic Logic under Coherence: Complexity and Algorithms
2005
In previous work [V. Biazzo, A. Gilio, T. Lukasiewicz and G. Sanfilippo, Probabilistic logic under coherence, model-theoretic probabilistic logic, and default reasoning in System P, Journal of Applied Non-Classical Logics 12(2) (2002) 189---213.], we have explored the relationship between probabilistic reasoning under coherence and model-theoretic probabilistic reasoning. In particular, we have shown that the notions of g-coherence and of g-coherent entailment in probabilistic reasoning under coherence can be expressed by combining notions in model-theoretic probabilistic reasoning with concepts from default reasoning. In this paper, we continue this line of research. Based on the above sem…
Increased conformational rigidity of humic substances by oxidative biomimetic catalysis
2005
A synthetic water-soluble meso-tetra(2,6-dichloro-3-sulfonatophenyl)porphyrinate of iron(III) chloride, Fe(TDCPPS)Cl, was employed as a biomimetic catalyst in the oxidative coupling of terrestrial humic materials. High-performance size-exclusion chromatography (HPSEC), solid-state nuclear magnetic resonance (CPMAS-(13)C NMR), electron paramagnetic resonance (EPR), and diffuse reflectance infrared spectroscopy (DRIFT) were used to follow conformational and structural changes brought about in different humic materials by the oxidative coupling. Increase in apparent weight-average molecular weight (Mw(a)) occurred invariably for all humic substances with the oxidative polymerization catalyzed …
Epigenetic involvement in Hutchinson-Gilford progeria syndrome: a mini-review.
2013
Hutchinson-Gilford progeria syndrome (HGPS) is a rare human genetic disease that leads to a severe premature ageing phenotype, caused by mutations in the <i>LMNA</i> gene. The <i>LMNA</i> gene codes for lamin-A and lamin-C proteins, which are structural components of the nuclear lamina. HGPS is usually caused by a de novo <i>C1824T</i> mutation that leads to the accumulation of a dominant negative form of lamin-A called progerin. Progerin also accumulates physiologically in normal ageing cells as a rare splicing form of lamin-A transcripts. From this perspective, HGPS cells seem to be good candidates for the study of the physiological mechanisms of ageing…