88,008 research outputs found
Lackner survey dataset
No full textSurvey dataset from paper: Lackner, S., Francisco, F., Mendonça, C., Mata, A., & Gonçalves-Sá, J. (2023). Intermediate levels of scientific knowledge are associated with overconfidence and negative attitudes towards science. Nature Human Behaviour
SIGN CHANGES IN THE ELECTRIC DIPOLE MOMENT OF EXCITED STATES IN RUBIDIUM-ALKALINE EARTH DIATOMIC MOLECULES
No full textIn a recent series of combined experimental and theoretical studies we investigated the ground state and several excited states of the Rb-alkaline earth molecules RbSrfootnote{F. Lackner, G. Krois, T. Buchsteiner, J. V. Pototschnig, and W. E. Ernst, Phys. Rev. Lett., 2014, 113, 153001; G. Krois, F. Lackner, J. V. Pototschnig, T. Buchsteiner, and W. E. Ernst, Phys. Chem. Chem. Phys., 2014, 16, 22373; J. V. Pototschnig, G. Krois, F. Lackner, and W. E. Ernst, J. Chem. Phys., 2014, 141, 234309} and RbCa.footnote{J. V. Pototschnig, G. Krois, F. Lackner, and W. E. Ernst, J. Mol. Spectrosc., in Press (2015), doi:10.1016/j.jms.2015.01.006} The group of alkali-alkaline earth (AK-AKE) molecules has drawn attention for applications in ultracold molecular physics and the measurement of fundamental constantsfootnote{M. Kajita, G. Gopakumar, M. Abe, and M. Hada, J. Mol. Spectrosc., 2014, 300, 99-107} due to their large permanent electric and magnetic dipole moments in the ground state. These properties should allow for an easy manipulation of the molecules and simulations of spin models in optical lattices.footnote{A. Micheli, G. K. Brennen, and P. Zoller, Nature Physics, 2006, 2, 341-347}
In our studies we found that the permanent electric dipole moment points in different directions for certain electronically excited states, and changes the sign in some cases as a function of bond length. We summarize our results, give possible causes for the measured trends in terms of molecular orbital theory and extrapolate the tendencies to other combinations of AK and AKE - elements.Made available in DSpace on 2016-01-05T20:03:32Z (GMT). No. of bitstreams: 3
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Previous issue date: 2
Two-step excitation of Rb atoms on He nanodroplets
No full textWe present the first sequential laser excitation of atom-doped helium nanodroplets. Rubidium atoms on the surface of helium nanodroplets are selectively excited with a continuous wave laser to the 5(2)P(1/2) state so as not to desorb from the nanodroplets. From there they are excited by a laser pulse to the 5 2 D state; a laser-induced fluorescence (LIF) spectrum is recorded by monitoring the 6(2)P -> 5(2)S(1/2) emission. The LIF spectrum differs from that of the two-photon one-color direct excitation spectrum 5(2)D <- 5(2)S(1/2), indicating that the system does relax vibrationally during the lifetime of the 5(2)P(1/2) state. To model the LIF spectra we use calculated energy levels of the Rb atom as a function of its distance R from the center of the helium nanodroplet. The Franck-Condon factors of the resulting potential energy curves agree with the experimental spectra. In the future the 5(2)P(1/2) state can be used as a springboard to reach high-lying (2)S and (2)D states, and possibly create an artificial super-atom
Transcriptional activators and repressors for the neuron-specific expression of a metabotropic glutamate receptor
No full textMetabotropic glutamate receptor 1 (mGlu1) has a discrete distribution in the central nervous system restricted to neurons. Its expression undergoes important changes during development and in response to physiological and pathological modifications. Here, we have determined the structure of the mGlu1 gene and demonstrated that mGlu1 transcription takes places at alternative first exons. Moreover, we have identified active promoter regions upstream from the two most expressed first exons by means of luciferase reporter gene assays performed in primary cerebellar granule neurons. Targeted mutations of active elements constituting the core promoter and electrophoretic mobility shift assays demonstrated that the factors thyroid transcription factor-1 and CCAAT/enhancer-binding proteins β act synergistically to promote mGlu1 transcription. We have also elucidated the molecular bases for the neuron-specific expression of mGlu1 identifying a neural restrictive silencing element and a regulatory factor for X box element, which suppressed mGlu1 expression in nonneuronal cells. These results reveal the molecular bases for cell- and context-specific expression of an important glutamate receptor critically involved in synaptogenesis, neuronal differentiation, synaptic transmission, and plasticity. © 2007 by The American Society for Biochemistry and Molecular Biology, Inc
Variations on the Author
No full text“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Rydberg states of alkali metal atoms on superfluid helium droplets – Theoretical considerations
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Previous issue date: 6The bound states of electrons on the surface of superfluid helium have been a research topic for several decades. One of the first systems treated was an electron bound to an ionized helium cluster.footnote{A. Golov and S. Sekatskii, Physica B, 1994, 194, 555-556} Here, a similar system is considered, which consists of a helium droplet with an ionized dopant inside and an orbiting electron on the outside. In our theoretical investigation we select alkali metal atoms (AK) as central ions, stimulated by recent experimental studies of Rydberg states for Na,footnote{E. Loginov, C. Callegari, F. Ancilotto, and M. Drabbels, J. Phys. Chem. A, 2011, 115, 6779-6788} Rb,footnote{F. Lackner, G. Krois, M. Koch, and W. E. Ernst, J. Phys. Chem. Lett., 2012, 3, 1404-1408} and Csfootnote{F. Lackner, G. Krois, M. Theisen, M. Koch, and W. E. Ernst, Phys. Chem. Chem. Phys., 2011, 13, 18781-18788} attached to superfluid helium nanodroplets. Experimental spectra , obtained by electronic excitation and subsequent ionization, showed blueshifts for low lying electronic states and redshifts for Rydberg states._x000d_
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In our theoretical treatment the diatomic AK-He potential energy curves are first computed with textit{ab initio} methods. These potentials are then used to calculate the solvation energy of the ion in a helium droplet as a function of the number of atoms. Additional potential terms, derived from the obtained helium density distribution, are added to the undisturbed atomic pseudopotential in order to simulate a 'modified' potential felt by the outermost electron. This allows us to compute a new set of eigenstates and eigenenergies, which we compare to the experimentally observed energy shifts for highly excited alkali metal atoms on helium nanodroplets._x000d
Scrittura, cultura e scienza filologica a Bologna nel secolo XI.
No full textTrattasi della revisione della storia bolognese del secolo XI attraverso una nuova analisi delle fonti documentarie e codicologiche disponibili, nel tentativo di fare nuova luce sul secolo che precedette l'esplosione bolognese avutasi a partire dal XII secolo con l'insegnamento di Irnerio e la nascita dello "Studium". Il contributo si compone di tre parti: 1) una rilettura della storia bolognese tra X e XI secolo, condotta da un lato in riferimento al quadro storico politico e dall'altro sulla base di alcuni documenti, in particolare vescovili, sottoposti a nuovo vaglio critico; 2) l'esame paleografico di un gruppo di codici e frammenti liturgici che, a partire dal famoso graduale-tropario ms. Angelica 123, la storiografia ha assegnato a Bologna, esame volto a verificare l'eventuale esistenza di un indirizzo grafico comune o di scuola; segue l'analisi di un piccolo gruppo di documenti notarili riferibili alla curia episcopale bolognese, allo scopo di tracciare le linee complessive delle scritture prodotte a Bologna nel corso dell'XI secolo all'interno o nell'ambito della cattedrale, sui due versanti della scrittura di libri e di documenti; 3) uno studio complessivo degli usi grafici sia dei professionisti della scrittura sia dei sottoscrittori autografi, condotto sulle carte bolognesi del secolo XI
[Newspaper Clipping: Author Claims Evidence of Second JFK Assassin #1]
No full textNewspaper article titled "Author Claims Evidence of Second JFK Assassin." The article states that author Richard J. Whalen concluded "that there is circumstantial evidence to support the theory of a second assassin in the shooting of President John F. Kennedy.
Also By The Same Author: AKTiveAuthor, a Citation Graph Approach to Name Disambiguation
No full textThe desire for definitive data and the semantic web drive for inference over heterogeneous data sources requires co-reference resolution to be performed on those data. In particular, name disambiguation is required to allow accurate publication lists, citation counts and impact measures to be determined. This paper describes a graph-based approach to author disambiguation on large-scale citation networks. Using self-citation, co-authorship and document source analyses, AKTiveAuthor clusters papers, achieving precision of 0.997 and recall of 0.818 over a test group of eight surname clusters
John F. Kennedy telegram to Roosevelt
No full textJersey Homesteads (later the Borough of Roosevelt) was established in the 1930s as an agro-industrial cooperative community. It was established specifically for urban Jewish garment workers, many of whom had emigrated from Europe. President John F. Kennedy sent a telegram to the citizens of Roosevelt, New Jersey, apologizing for not being able to attend the memorial dedication in honor of former President Franklin Delano Roosevelt. (Jersey Homesteads became Roosevelt in 1945 in honor of the president.) President Kennedy expressed his gratitude to the people of Roosevelt for constructing the memorial, and commented that it will serve as a constant reminder of Roosevelt's good works
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