Search results for "ALK"
showing 10 items of 4314 documents
<title>Shallow electron traps in alkali halide crystals: Mollwo-Ivey relations of the optical absorption bands</title>
2001
Evidences are given that two classes of the transient IR- absorption bands: (a) with max. at 0.27-0.36 eV in NaCl, KCl, KBr, KI and RbCl (due to shallow electron traps according G. Jacobs or due to bound polarons according E.V. Korovkin and T.A. Lebedkina) and (b) with max. at 0.15-0.36 eV in NaI, NaBr, NaCl:I, KCl:I, RbCl:I and RbBr:I (due to on-center STE localized at iodine dimer according M. Hirai and collaborators) are caused by the same defect- atomic alkali impurity center [M+]c0e- (electron e- trapped by a substitutional smaller size alkali cation impurity [M+]c0). The Mollwo-Ivey plots (for the transient IR-absorption bands) of the zero-phonon line energy E0 (for NaCl, KCl, KBr, Rb…
Evidence for an Intermediate in the Methylation of CB11H12−with Methyl Triflate: Comparison of Electrophilic Substitution in Cage Boranes and in Aren…
2013
The trideuteriomethylation of BH vertices in CB11H12− and its derivatives with CD3OTf (OTf=triflate, trifluoromethanesulfonate) yields a mixture of BCD3 and BCHD2 substitution products, thus demonstrating the intermediacy of a species with a long enough lifetime for hydrogen scrambling between the boron vertex and the methyl substituent. No such scrambling is observed if CD3OTf is used to methylate toluene. According to density functional theory calculations, the intermediate in BH vertex methylation is a three-center bonded σ adduct of a methyl cation to the BH bond and the proton scrambling occurs via a transition structure containing a distorted square-pyramidal methane attached axially …
Mesomorphic Donor-Acceptor-substituted 1,4-Distyrylbenzenes
2009
Conjugated oligomers with terminal donor-acceptor substitution attract increasing attention in organic chemistry because of their outstanding and not seldom unexpected properties in materials science [1 – 4]. Although a variety of oligo(1,4-phenylene-vinylene)s with terminal donor-acceptor substitution (DAOPVs 1, Scheme 1) are known [5 – 22], the number of thermotropic liquid crystals among them is very low and is confined to monomers (n = 1), that means to certain push-pull substituted (E)-stilbenes [23 – 31]. The behavior of conjugatedmolecules, which are highly polar and form mesophases by self-organization, is very interesting for various applications of liquid crystals [3]. A big disad…
Nikephoros Bryennios the Younger – the First One Not to Become a Blind Man? Political and Military History of the Bryennios Family in the 11th and Ea…
2020
Nikephoros Bryennios the Younger has a place in the history of Byzantium as the author of one of the works devoted to the Komnenos family coming to power. This outstanding observer and talented leader, who was fascinated by the person of his father-in-law Alexius I Komnenos, came from a family whose ambitions were no less than the those in the one into which Nikephoros himself married. His father and grandfather, also his namesake, were those who dreamed of an imperial crown for themselves and tried to reach for it armed. Apart from defeat, they both faced punishment which was blinding. One of those who captured and ordered the father of Nikephoros the Younger to be blinded was his future f…
(De)constructing “America”: the Case of Emir Kusturica’s Arizona Dream (1993)
2010
By means of an analysis of Kusturica’s only film about America, Arizona Dream, this article argues that while the United States offers a vision of a united society founded on diversity, it also represses, altering in the process both society and the landscape. National unity is consequently a dream – a dream the film suggests that has often been dreamed up by un-Americans. Filtered through Kusturica’s own perceptions of America – and his position on the Balkan War (1991-2001) – the film seems to suggest sadness at the loss of a multi-ethnic, multi-cultural perspective. Through its representations of geography and ethnic diversity, and its dense network of filmic citations, what Arizona Drea…
“I be da reel gansta”—A Finnish footballer’s Twitter writing and metapragmatic evaluations of authenticity
2015
This article explores the ways in which ‘gangsta’ English features are deployed, evaluated and adopted in two types of social media, the web forum and Twitter, within the domains of hip hop culture and football (soccer) culture, from the dual perspective of authenticity and normativity. Empirically, we aim to break new ground by investigating the intricate interconnections between two social media formats and combining two highly popular but previously seldom connected cultural forms—football and hip hop. Our theoretical aim is to contribute to the current debate on authenticity, normativity, popular culture and social media, and the complex ways in which they are connected. We focus, first…
‘Glocal’ processes in peripheral football countries:A figurational sociological comparison of Finland and Hungary
2015
The aim of this article is to increase the understanding of the global and local contexts in football by finding out what social, cultural and economic dimensions seem to characterize ‘periphery’ football. This study applies figurational sociological perspective, which is applicable to the research on globalization processes and sport. The sources utilized are publications on the history and sociology of football as well as interviews with football practitioners. First, a theoretical framework of the global football figuration is advanced. Second, applying the constructed framework, the concept of periphery football country is discussed. It was found in accordance with previous research tha…
Embracing water, healing pine : touch-walking and transcorporeal worldings
2023
This article considers touch as an embodied worlding practice in the context of humans intentionally seeking tactile trans-species contact. In particular, it examines three co-researchers’ tactile relations with tree(s) and water which were explored by “touch-walking,” an immersive method developed for this study. The method opened possibilities for examining transcorporeal sensory matterings and affective flows between the researcher’s body, co-researchers’ bodies and more-than-human bodies. This experimental micro-research brings knowledge about how people form deeply meaningful relationships with natural bodies, making worlds by cherishing tactile contact with them. Theoretically, we “po…
Global and local interactions in football : the changing field of professional football stadiums in Finland and Hungary in the 2000s
2018
This article aims to increase understanding of the global-local contexts in football by exploring the changing field of professional football stadiums in Finland and Hungary in the 2000s. More specifically, the cases of two clubs, HJK (Finland) and Ferencvárosi TC (Hungary) are studied. We employ concepts of sport and globalization. The research data consist of semi-structured expert interviews with Finnish and Hungarian football practitioners, media and club documents, and data from observation. The results suggest that interactions of global and local forces are reflected in the development and operation of stadiums. On the one hand, international and national governing bodies have streng…
Structure-reactivity relationship for aromatics transalkylation and isomerization process with TNU-9, MCM-22 and ZSM-5 zeolites, and their industrial…
2011
[EN] TNU-9 is a medium pore zeolite with a complex tridimensional channel system. Its catalytic properties have been studied in some reactions that involve the BTX fraction, such as benzene and toluene alkylation with methanol, ethanol or isopropanol. These reactions use in practice medium pore zeolites such as ZSM-5 (MFI) or MCM-22 (MWW), and the selectivities obtained with TNU-9 are compared and analyzed from the point of view of the zeolite structure and pore topology, as well as from its possible industrial application. For benzene alkylation to give ethylbenzene (EB), TNU-9 is an active and selective catalyst with selectivities to EB much higher than ZSM-5 and close to those of the ind…