192 research outputs found
A method for analyzing the cyclic electron delocalization interaction between different rings in polycyclic molecules
No full text© 2020 Wiley Periodicals LLC There are many theoretical and experimental approaches which can be used to assess the extent of cyclic electron delocalization in polycyclic conjugated compounds. On the other hand, methodologies capable of measuring how electron delocalization in the given ring is influenced by the presence of some other ring within the same molecule have attracted considerably less attention. To address this problem, a simple method, the so-called pairwise fragment interaction (PFI) was put forward and discussed. The PFI is defined thorough the bond orders between the atoms belonging to different rings within the given molecule. In a series of benzo-annelated anthracene and acridine derivatives it was demonstrated that the proposed PFI method can provide both, qualitative and quantitative relations between the information extracted from the density matrix and different indices which measure structural, energetic, electron delocalization and magnetic aspects of aromaticity
Three Meetings of Architects Slavko Löwy and Drago Ibler
No full textZaključivši popis djela arhitekta Slavka Löwyja (Koprivnica 1904.-Zagreb 1996.) jednog od sustvaratelja hrvatske moderne arhitekture 30/ih godina, nametnula se tema njegovih "bliskih susreta" s najistaknutijim akterom razdobjla - arhitektom Dragom lblerom (1894.-1962.). Iblerov opus već je temeljito interpretiran, dok valorizacija Löwijeva djela tek predstoji. Obojica su, u razmaku od deset godina, diplomu stekli kod Martina Dülfera na Visokoj tehničkoj školi u Dresdenu. Autorica analizira tri profesionalna susreta Drage Iblera i Slavka Luowyja, kao konkurenata na zagrebačkim lokacijama za koje su između 1933. i 1936. godine, raspisivani natječaji za ugrađene stambene ili stambeno-poslovne zgrade, koje su uglavnom bile realizirane prema Luowyjevu projektu. Analiziraju se specifičnosti rješenja obaju autora, kao i njihova moguća zajednička polazišta.After completing the list of works by the architect Slavko Lowy (Koprivnica 1904 - Zagreb 1996), who was one of the creators of modem Croatian architecture of the 1930s, the author addressed the subject of his meetings with the most prominent architect of that period, Drago Ibler (1894.1962). Both of them graduated with Martin Dulfer at the High Technical School in Dresden in a period of ten years, but while Ibler's opus has been interpreted in detail, the evaluation of Lowy's work is still to come. The author analyses three professional meetings of Drago Ibler and Slavko Lowy as competitors at competitions for inserted residential or residential-business buildings on Zagreb locations between 1933 and 1936. Most of the buildings were built according to Lowy's design. Although Ibler approached the theme of the skyscraper in many of his projects, it was the younger Lowy who built Zagreb's first high-rise. He won first prize at the narrower competition for the Radovan corner building between Masarykova and Gundulićeva Streets in 1933. Ibler built his first high-rise after the Second World War. In 1935 comfortable houses in close contact with nature had to be designed on the steep ground between Ribnjak park and Novakova Street. Ibler suggested two buildings on the edges of the lot with a green garden between them, but Lowy's design of one very deep building (in fact two with a common stairway) with green terraces climbing up the hill was accepted (20 Ribnjak). Almost at the same time Ibler built his anthological Markulin residential building on No. 16 of the same street. When the area of the former Zagreb Fair in Martićeva Street began to be built up in 1936, lbler designed the corner building at 14c Martićeva for the Wienerbankvereing, and Lowy built the adjacent house in 4 Bulićeva Street for the same investor, although Ibler was originally to have built both buildings. The author analyzes the specific solutions offered by both acrhitects, and their possible common starting points
THE DRAMA OF GENERAL SLAVKO KVATERNIK'S LIFE
No full textAutorica prati političko djelovanje Slavka Kvaternika, ministra hrvatskog domobranstva. Članak izlaže Kvaternikova polazišta tridesetih, kada on pripada krugu domovinskih nacionalista, i njegovu ulogu u Nezavisnoj Državi Hrvatskoj 1941.-1945. Autorica ukazuje na Kvatemikovu javnu djelatnost, u kojoj prevladava njegov antagonistički odnos prema krajnjoj nacionalnoj desnici oko Poglavnika A. Pavelića.The author surveys the public activities of Slavko Kvaternik, one of the leading Croatian nationalists of the 1930s, and for a time, minister of the Croatian Home Army during the Second World War (1941-1942). The article argues that Kvaternik occupied a peculiar position with respect to the radicals grouped around Ante Pavelić, the leader of the Ustasha regime. Kvaternik was not a ideologue of the Independent State of Croatia (NDH), nor did he agree with Pavelić's repressive internal policy or Pavelić's dependence on fascist Italy. Because of this conflict, Kvaternik was pushed out of office and left Croatia at the end of 1942. None of these facts prevented the Yugoslavian government from proclaiming him a »war criminal« and carrying out the death sentence in 1947
Total π-electron energy and Laplacian energy: How far the analogy goes?
No full textThe Laplacian energy LE is a newly introduced molecular-graph-based analog of the total π-electron energy E. It is shown that LE and E have a similar structure-dependency only when molecules of different sizes are compared, when a good linear correlation between them exists. Within classes of isomers, LE and E are either not correlated at all or (as in the case of acyclic systems) are inversely proportional. The acyclic graphs and molecular graphs having the greatest and smallest LE values (determined in this work) differ significantly from those (previously known) having the greatest and smallest E values
Magnetically induced current density in triple-layered beryllium-boron clusters
No full text© the Owner Societies 2019. Magnetically induced current densities were used to examine the aromatic character of two charged Be-B clusters, Be6B102- (1) and Be6B11- (2). The current densities were computed by means of the diamagnetic-zero variant of the continuous transformation of the origin of the current density (CTOCD-DZ) method. It has been shown in previous studies that 1 and 2 have a triple-layered structure in which a B10/B11 central ring is sandwiched between two Be3 rings. The current density calculations for the examined Be-B clusters revealed their double aromatic nature, which arises from the presence of two orthogonal, cyclically delocalized electronic subsystems within these molecules. The pattern of the current density distribution in the triple-layered Be-B clusters was found to be analogous to the one in the monocyclic C10 cluster, which is a prototypical double aromatic system. The present study demonstrated that the current-density-based analysis provides much more information about the aromatic nature of the studied molecules than that based on the nucleus independent chemical shifts (NICS) index
Marcel Odenbach. Konzept, Performance, Video, Installation 1975 – 1998
No full textSlavko Kacunko’s dissertation represents the first monograph on one German video artist. In view of the utter rarity of examinations of this kind, an aim has consisted in elucidating a series of fundamental standpoints. Among them was the attempt to make the methods of art history productive for the medium of video, without neglecting the aspect of media aesthetics. This was the only way that would enable the author to take a third route, between the traditional art-historical approach on the one hand and the approaches of media theorists on the other, and to set as an absolute precondition the analysis of the individual work. EXCERPTS FROM THE PRESS RELEASE drupa 2000English„Art history pioneer achievement in the field of video art. The 36-year old Duesseldorfer gained the award for his dissertation on „Marcel Odenbach. Concept, Performance, Video. Installation from 1975 to 1998“ ... Dr. Kacunko´s thesis has wider parameters than its title may perhaps suggest. It not only explores Marcel Odenbach´s creative output but structures the framework of video art in Germany and sets it in the context of art history, from its advent in 1970s to the present day. Albrecht Bolza-Schünemann welcomed this choice of topic: „In essence, Dr. Kacunko tackles an issue that has riveted the printing and media industry for years: how to deal with new media and make the most of their creative and technological potential.“ By examining Marcel Odenbach´s works, Dr. Kacunko illustrates the vast creative sweep of video art, considering its cognitive, technical and aesthetic aspects.To have documented in such cogent – and comprehensive – a manner the significance of the video artist Marcel Odenbach and what sets his oeuvre apart, is in itself a considerable feat. But the insights so gained go beyond his oeuvre and lay the foundations for a future, sound art-historical practice in dealing with video or media art in general. Therefore this book deserves recognition as a pioneering contribution to an art history of video art.FrenchLe Laurèat drupa de l`annèe 2000 s`appell Slavko Kacunko. Ce Düsseldorfois de 36 ans sera `recompensè pour sa thèse sur la thème Marcel Odenbach. Concept, performance, vidèo/ installations de 1975 à 1998. C`est la 25ème fois dèjà que Messe Düsseldorf hohore ainsi, en sa qualitè d`organisateur de drupa, un excellent travail scientifique et contribue, avec un prix d`un montant de 10.000 marks, à la puplication et à la diffusion de la thèse. Joachim Erwin, premier maire de Düsseldorf et prèsident du conseil de surveillance de Messe Düsseldorf, et Albrecht Bolza-Schünemann, prèsident de drupa 2000 et prèsident adjoint du directoire de Koenig & Bauer AG, remettront le document officiel à Monieur Slavko Kacunko le 22 mai lors d`un acte solennel dans le cadre de drupa 2000. Même si le titre de la thèse le laisse supposer à première vue, dans son travail Monsieur Kacunko ne se limite pas à l`acation artistique de Marcel Odenbach. Il donne sumulatenèment une structure à l`histoire allemande de l`art vidèo et la situe dans le contexte de l`histoiere de l`art – de la situation de dèpart en 1970 au prèsent.Albrecht Bolza-Schünemann s`est particulièrement rèjoui du thème choisi pour le travail : En principe, Monsieur Kacunko se penche sur le même problèm que celui qui fascine egalement la branche de l`industrie graphique et des mèdias depus des annèes : la question de l`utilisation des nouveaux mèdias et de l`exploitation de leur potentiel crèatif et technique.>> Monsieur Kavunko montre, à l`exemple de l`oeuvre de Marcel Obenbach, les multiples possibiltitès de configuration offertes par l`art vidèo, en tenant comote des aspects non seutement cognitifs et techniques, mais ègalement esthètiques.Nè en 1964 à Osijek en Croatie, Slavko Kacunko a d`abort fait des ètudes rèusseis de pèdagogie avant d`ètudie l`histoire de l`art et philosophi à la facultè de philosophi de l`uiversitè de Zagreb de 1987 à 1993. De 1994 à 1998, il a finalement prèparè sa thèse de doctorat à la facultè de philosophi de L´universitè Heinrich Heine de Düsseldorf. Avec de nombreuses publications sur l`art contemporain, làrt du cinèma et de la vidèo ainsi que grâce à son activitè curateur et de critique d`art indèpendant, Monsieur Kacunko a dèjà attirè l`attetion sur lui pendant ses ètudes. Lors du dernier semestre d`hiver , Monsieur Kacunko a ètè, en plus de son activitè d`indèpendant, chargè de cours à la section des sciences du Thèâtre, du cinèma et des mèdias de lùniversitè Goethe de Francfort-sur-le Main.Chaque annèe, un comitè de professionnels composè du prèsident et du secrètaire gènèral de l`universitè Heinrich Heine de Düsseldorf, du prèsident de drupa et du prèsident-directeur gènèral de Messe Düsseldorf dècide de l`attribution du prix drupa. Le prix drupa est attribuè depuis 1978. Italian<< BackIl premio Drupa 2000drupa 2000 – comonica to stampa n. 27/maggio 2000 Appuntamento al prossimo 25 maggio: il premio drupa festeggia il suo Venticinquesimo anniversario Assegnato al Dr. Slavko Kacunko il premio drupa 2000 Presatazioni pionieristiche per la storia dell`ate nel campo dell`arte Video Il premio drupa 2000 è stato assegnato al Dr. Slavko Kacunko. Il trentaseienne vincitore die Düsseldorf è stato insignito di questo ambito riconoscimento par la sua dessertazione sul tema “Marcel Odenbach. Konzept, Performance, Video/ Installationen von 1975-1998”. E`la venticinquesim volta che Messe Düsseldorf, in qualità di organizzatrice dell drupa, onora così uno straordinario lavoro scientifico e promuove con un premio in denaro dell`importo di 10`000 marchi la pubblicazione e la diffusione della dissertazione. Il 22 maggio scorso, in una festosa cornice nell`ambito della drupa 2000 Joachim Erwin, sindaco di Düsseldorf e presidente del vomitato di Vigilanza di Messe Düsseldorf, e Albrecht Bolza-Schünemann, pesidente Della drupa 2000 e vicepresidente del consiglio di amministrazione della Koenig & Bauer AG, conferiranno al Dr. Slavko Kacunco l`ambito titolo. Diversamente da quanto si potrebbe presumere di primo in base al suo titolo, il lavoro del Dr. Kacunko non si limita unicamente all`operato artistico di Marcel Obenbach, ma conferscie al contempo una sua struttura alla storia dell`arte, dai suoi esordi nel 1970 sino ai giorni nostri. Albrecht Bolza-Schürmann si è dichiarato particolarmente soddisfatto per la scelta dell`argomento. “Il Dr. Kacunko affronta in sostanza la medesima questine che occupa ormai de anni anche il settore della stampa e dei media ovvero quella relativa alla gestione dei nuovi mezzi di comunicazione e allo sfruttamento del loro potenziale tecnico e creativo.”.Il Dr. Kacunko illusta, sulla scorta dell`operato di Marcel Obenbach, le enormi possibilità configurative offerte dell`arte video tenendo conto in qusto contesto sia degli aspetti cognitivi, sia di quelli tecnici ed estetici. Nato nel 1964 a Osijek, in Croazia, dopo aver concluso con successo i suoi studi di pedagogia, tra il 1987 e il 1993 Slavko Kacunko ha studiato storia dell`arte e filosofia presso la facoltà di filosofia dell`Università die Zagabria.Tra il 1994 e il 1998 frequent infine il corso di dottorato della facoltà di filosofia della Heinrich-Heine Universität di Düsseldorf. Con nummerose pubblicazioni dedicate all`arte contemooranea, alla cinematografia e all`arte video e la sua attività indipendente in veste di coratore e critico d`ate, il Dr. Kacunco ha suscitato interesse già durante il suo periodo di studi. Nel passato semestre invarnale, Kacunco ha aggiunto alla sua attività come libero professionista una docenza prsso la Goethe- Universistät di Francoforte nel settore specifico delle scienze teatrali, cimentografiche e delle conunicazioni. In merito al conferimento del premio drupa decide annualmente una giuria di specialisti del ramo, composta in particolare dal rettore e dal prorettore della Heinrich-Heine Universität di Düsseldorf, dal presidente della drupa e dak oresudebte dekka durezione generale die Messe Düsseldorf. Il premio è stato istituto nel 1978.GermanDer drupa-Preis des Jahres 2000 heisst Dr. Slavko Kacunko. Der 36jährige Düsseldorfer erhält die Auszeichnung für seine Dissertation zum Thema „Marcel Odenbach. Konzept, Performance, Video/Installation von 1975-1998“. Bereist zum 25. Mal würdigt die Messe Düsseldorf als Veran- stalter der drupa damit eine herausragende wissenschaftlichen Arbeit und fördert mit einem Preisgeld in Höhe von 10.000 Mark die Publikation und Verbreitung der Dissertation.Joachim Erwin, Oberbürgermeister von Düsseldorf und Vorsitzender des Aufsichtsrates der Messe Düsseldorf, und Albrecht Bolza-Schürmann, Prä- sident der drupa 2000 und stv. Vorsitzender des Vorstandes der Koenig & Bauer AG, überreichten am 22. Mai in feierlicher Atmosphäre die Urkunde An Dr. Slavko Kacunko im Rahmen der drupa 2000. Auch wenn es der Titel der Promotion vordergründig vermuten lässt, be- schränkt sich Dr. Kacunko in seiner Arbeit nicht nur auf das künstlerische Wirken Marcel Odenbachs. Er verleiht zugleich der deutschen Videokunst- geschichte eine Struktur und ordnet sie in den kunsthistorischen Zusam- menhang ein – von der Ausgangssiruation im Jahre 1970 bis zur Gegen- wart.Albrecht Bolza-Schürmann zeigte sich über die Themenwahl der Ar- beit besonders erfeut:“Prinzipiell setzt sich Dr. Kacunko mit der gleichen Fragestellung auseinander, die auch die Print- und Media-Branche seit Jahren in ihren Bann zieht: Die Frage nach dem Ungang mit neuen Medien und die Ausnutzung ihres Kreativen und technischen Porentials.“ Dr. Kacunko zeigt am Beispiel des Werkes Marcel Odenbachs die enormen gestalterischen Möglichkeiten der Videokunst auf und berücksichtigt dabei sowohl kognitive, technische als auch ästhetische Aspekte.1964 in kroatischen Osijek geboren, studierte Slavko Kacunko im An- schluss an ein erfolgreiches Studium der Erziehungswissenschaften von 1987 bis 1993 Kunstgeschichte und Philosophie an der philosophischen Fakultät der Universität in Zagreb. Von 1994 bis 1998 belegte er schließ- lich den Promotionsstudiengang der philosophischen Fakultät der Hein- rich-Heine-Universität Düsseldorf. Mit zahlreichen Veröffentlichungen über zeitgenössische Kunst, Film- und Videokunst sowie durch seine freiberufli- che Tätigkeit als Kurator und Kunstkritiker hat Dr. Kacunko bereits wäh- rend seines Studiums Aufmerksamkeit erlangt. Im zurückliegenden Wintersemester hatte Dr. Kacunko in Ergänzung zu seiner freiberuflichen Tätigkeit einen Lehrauftrag inne an der Goethe-Universität zu Frankfurt am Main für den Fachbereich Theater-, Film- und Medienwissenschaften.Über die Vergabe des drupa-Preises enschedet jedes Jahr ein Fachgremium, bestehend aus dem Rektor und Prorektor der Heinrich-Heine- Universität Düsseldorf, dem Prästidenten der drupa und dem Vorsitzenden der Geschäftsleitung der Messe Düsseldorf. Der drupa-Preis wird seit 1978 verliehen. Pressereferat drupa 2000 PM Nr. 27 Mai 200
Electronic structure, stability, and aromaticity of M<inf>2</inf>B<inf>6</inf> (M = Mg, Ca, Sr, and Ba): an interplay between spin pairing and electron delocalization†
No full textIt has been shown in previous studies that the Be2B6 complex exhibits a triplet ground state with double aromaticity. In this work, the stability, electronic structure, and aromaticity of the homologous series M2B6 (M = Mg, Ca, Sr and Ba) were examined and compared to those of Be2B6. At the CCSD(T)/def2-TZVP//B3LYP/def2-TZVP level of theory, the target molecules were found to be more stable in the singlet than in the triplet spin state. Magnetically induced current densities and multicentre delocalization index (MCI) were employed to assess the aromatic character of the studied complexes. Both employed methods agree that M2B6 (M = Mg, Ca, Sr and Ba) are π aromatic and σ nonaromatic in the singlet ground state, and double aromatic in the triplet state. It was demonstrated that the electron counting rules of aromaticity cannot be used to correctly predict the aromaticity and relative stability of the examined molecules in different spin states
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