713 research outputs found
Buffer statistical multiplexing for bursty data calls in ATM network
No full textIn this paper a study on a link buffer multiplexing scheme, fast buffer reservation (FBR), has been developed. A method for statistically reserving link buffers space to virtual circuits sharing a transmission resource in ATM networks is proposed. It takes advantages from the bursty nature of traffic while preserving user burst integrity. Effective network performance improvements has been observed by simulating real system behaviour in presence of homogeneous sources traffic for different burstiness values. An upper bound on burst loss probability, which can be used at the call set up phase, has been computed. It is useful for assuring a given network quality of service to each accepted virtual circuit, when the new method is adopte
Hydrogeology of thermal waters in Viterbo area, central Italy
No full textA conceptual hydrogeological model of the Viterbo thermal area (central Italy) has been developed. Though numerous studies have been conducted on its geological, geochemical and geothermal features, there is no generalized picture defining the origin and yield of the hydrothermal system. These latter aspects have therefore become the objectives of this research, which is based on new hydrogeological and geochemical investigations. The geological setting results in the coexistence of overlapped interacting aquifers. The shallow volcanic aquifer, characterized by fresh waters, is fed from the area around the Cimini Mountains and is limited at its base by the semiconfining marly-calcareous-arenaceous complex and low-permeability clays. To the west of Viterbo, vertical upflows of thermal waters of the sulphate-chloridealkaline- earth type with higher gas contents, are due to the locally uplifted carbonate reservoir, the reduced thickness of the semiconfining layer and the high local geothermal gradient. The hot waters (30–60°C) are the result of deep circulation within the carbonate rocks (0.5–1.8 km) and have the same recharge area as the volcanic aquifer. The upward flow in the Viterbo thermal area is at least 0.1 m3/s. This flow feeds springs and deep wells, also recharging the volcanic aquifer from below
Personality factors and depressive configurations. An exploratory study in an italian clinical sample
No full textIntroduction: This study focuses on the relationship between personality configurations and depressive experiences. More specifically, the aim of this study is to investigate the relationship between self-criticism and dependency and personality styles or disorders, exploring the association between personality features and depressive symptoms. The two-configurations model of personality developed by Blatt (2004, 2008) is adopted as a reference point in sharing a valid framework and in understanding the results. Methods: Five instruments are administered to 51 participants with a diagnosis of depressive disorder, in accordance with DSM-IV-TR (American Psychiatric Association, 2000): Self-criticism and dependency dimensions of depression are measured with the Depressive Experiences Questionnaire (DEQ); self-reported depression is assessed with the Beck Depression Inventory-ll (BDI-II); observer-rated depression is assessed with the Hamilton Depression Rating Scale (HDRS); personality is assessed with the Clinical Diagnostic Interview (CDI) and the Shedler Westen Assessment Procedure-200 (SWAP-200). Results: Only self-criticism, and not dependency, is associated with depressive symptoms. In addition, the SWAP Borderline PD Scale and the Dysphoric: Emotionally dysregulated Q-factor emerge as significant in predicting depression. Conclusions: Findings support the assumption that depressive personality configurations can enhance the vulnerability to developing depression. Theoretical and clinical implications of these results are discussed
Temperature control for an intra-mirror etalon in interferometric gravitational wave detector fabry–perot cavities
No full textThe sensitivity of interferometric gravitational wave detectors is optimized, in part, by balanced finesse in the long Fabry–Perot arm cavities. The input test mass mirrors of Advanced Virgo feature parallel faces, which creates an etalon within the substrate, adding variability in the total mirror reflectivity, in order to correct imbalanced finesse due to manufacturing tolerances. Temperature variations in mirror substrate change the optical path length primarily through varying the index of refraction and are tuned to correct for a finesse imbalance of up to 2.8% by a full etalon fringe of 0.257 K. A negative feedback control system was designed to control the mirror temperature by using an electrical resistive heating belt actuator for a heat transfer process modeled as a two-pole plant. A zero controller filter was designed which achieves temperature control within 2.3% of the etalon fringe and recovers to within 10% of the working point within 32 hours after a step input of one etalon fringe. A preliminary unlock condition control designed to compensate when the interferometer unlocks shows that the control remains stable even after a drastic change in the plant due to the absence of the laser heating. Further improvements to the control must also consider the full heat transfer mechanisms by using modern control state space models
Geophysical noise in the virgo gravitational antenna
No full textThe possibility of obtaining geophysical information from the system for controlling the position of the mirrors of the VIRGO laser-interferometric gravitational antenna and from angular perturbations of the vertical mirror lines is examined. Results from a study of tidal horizontal deformations are analyzed. © 2009 Springer Science+Business Media, Inc
Selective and Efficient Light-Driven CO2 Reduction to CO with a Heptacoordinated Polypyridine Iron(II) Catalyst
No full textThe selective generation of carbon-based products in the presence of proton donors currently represents one of the major goals in the catalysis of the CO2 reduction reaction (CO2RR). Within this framework, the iron complex of the 1-([2,2′-bipyridin]-6-yl)-N-([2,2′-bipyridin]-6-ylmethyl)-N-(pyridin-2-ylmethyl) methanamine ligand (DBPy-PyA) turns out to be a selective and efficient catalyst to promote the conversion of CO2 into CO. In the present work, we report a detailed experimental and computational investigation of the CO2RR by this metal complex. Efficient formation of CO (selectivity >90%) was attained under electrochemical conditions (applied potential of −2.0 V vs Fc+/Fc) using trifluoroethanol as the proton donor, which provides the best balance, among those tested, in terms of Lewis and Brønsted acidity. This is indeed instrumental in accelerating CO2 activation while minimizing the parallel generation of hydrogen byproduct. The high activity and selectivity toward CO formation were shown to arise from (i) the ability of the ligand to assist via intramolecular routes the formation of the metallacarboxylic acid catalytic intermediate, (ii) the favorable and almost barrierless detachment of the CO product from the putative iron(II) carbonyl intermediate, and (iii) the weak tendency of the two-electron-reduced complex to form the metal-hydride species. The CO2RR by the titled complex was further investigated under light-driven catalytic conditions with [Ru(bpy)3]2+ (bpy = 2,2′-bipyridine) as the sensitizer and N,N-diisopropylethylamine (DIPEA) as the electron donor, leading to unprecedented performances under 1 sun irradiation (0.85 mL CO per mL of solution, quantum yield of 9.4%, selectivity >97%, solely limited by degradation of the sensitizer). Transient absorption spectroscopy suggested that, for the three-component photochemical system examined, catalyst activation by the photogenerated reductant represents the rate-determining step of the photosynthetic process. With this information in hand, by carefully modulating the photon flux, we succeeded in achieving a more than 3-fold enhancement in the quantum yield of CO formation (up to 28%). All in all, our study showcases the great, but often underestimated, potential of molecular catalysis to target efficient and selective transformations
4 Songs - Don Mus.Ms. 1696 : V, pf
No full textCollectionQuelle: manuscript. - Provenienz: Fürstlich Fürstenbergische Hofbibliothek, Donaueschingen4 Canzoni Napolitane | Per Piano Forte | Del Sig|r Francesco Ruggi | In Napoli presso Celestino Bartolini Quantoj nuovi Nr: 4. Sec|d|o Pian
Personality factors and depressive configurations. An exploratory study in an Italian clinical sample
No full textIntroduction: This study focuses on the relationship between personality configurations and depressive experiences. More specifically, the aim of this study is to investigate the relationship between self-criticism and dependency and personality styles or disorders,
exploring the association between personality features and depressive symptoms. The two-configurations model of personality developed by Blatt (2004, 2008) is adopted as a reference point in sharing a valid framework and in understanding the results.
Methods: Five instruments are administered to 51 participants with a diagnosis of depressive disorder, in accordance with DSM-IV-TR (American Psychiatric Association, 2000): Self-criticism and dependency dimensions of depression are measured with the Depressive Experiences Questionnaire (DEQ); self-reported depression is assessed with the Beck Depression Inventory-II (BDI-II); observer-rated depression is assessed with the Hamilton Depression Rating Scale (HDRS); personality is assessed with the Clinical Diagnostic Interview (CDI) and the Shedler Westen Assessment Procedure-200 (SWAP-200).
Results: Only self-criticism, and not dependency, is associated with depressive symptoms. In addition, the SWAP Borderline PD Scale and the Dysphoric: Emotionally dysregulated Q-factor emerge as significant in predicting depression.
Conclusions: Findings support the assumption that depressive personality configurations can enhance the vulnerability to developing depression. Theoretical and clinical implications of these results are discussed
Unknown artworks and further considerations regarding Paolo de Matteis, Giuseppe Simonelli, Lorenzo Ruggi and other followers of Luca Giordano
No full textCientos de pinturas napolitanas de los siglos XVII y XVIII han sido generalmente atribuidas a la escuela de Luca Giordano, quien tuvo un largo número de alumnos cuyos nombres han sido transmitidos por las principales fuentes de la historiografía artística. A algunos de ellos, como Franceschitto o Monsù Anselmo, no les podemos asociar ni siquiera con una obra. Por el contrario, hay casos de seguidores anónimos de Giordano con un estilo reconocible, como el autor de las dos versiones de Santiago el Mayor, una conservada en Casalnuovo de Nápoles y la otra en Lecce. Otras obras siguen fielmente el estilo de Giordano y llevan la firma de pintores que serían de otro modo desconocidos, caso de Lorenzo Ruggi, que firma una hermosa Inmaculada en la iglesia de S. Franciscode Aversa. Otro notable artista seguidor de Giordano es el «G. Fatteruso» que firma el Milagro de San Biagio en la iglesia de San Biagio en Mugnano de Nápoles. Es sin duda plausible la identificación con Giuseppe Fattorusso, recordado como discípulo de Vaccaro y luego de Beinaschi, si bien la comparación con sus obras documentadas plantea algunas dudas. Por último, una revisión de obras de diversa calidad, atribuidas con reserva a Luca Giordano o a su taller, puede arrojar una nueva luz sobre la cuestión de las numerosas imitaciones de las obras del maestro. La calificación de copias sería la más adecuada, por ejemplo, para las dos versiones de la Bendición de Isaac aparecidas en el mercado anticuario de Nueva York y en una colección privada en Sant’Arpino.Hundreds of 17th- and 18th-century Neapolitan paintings have been generically attributed to the school of Luca Giordano, who had many pupils, whose names have become known to us thanks to the leading historiographical sources of Neapolitan art. The work of some of these artists, such as Franceschitto and Monsu Anselmo, is unknown, although there are some anonymous Giordano followers who can easily be identified by their style, among them the author of two versions of St James the Greater, one of which is kept in Casalnuovo di Napoli and the other in Lecce. In addition, there are other works that are heavily influenced by Giordano and signed by hitherto unknown artists. These include Lorenzo Ruggi, who painted the wonderful Immaculate adorning St Francis Church in Aversa. Recent documentary research has revealed some information on the painter. Another leading follower of Giordano’s is one “G. Fatteruso”, who completed the majestic Miracle of St Blaise at St Blaise Church in Mugnano di Napoli. Though there are obvious grounds for identifying this artist as Giuseppe Fattorusso,remembered as a pupil of Vaccaro and later of Beinaschi, comparisons with the latter’s documentedworks suggest that this is not the case. Finally, newly conducted analysis of poorer-quality paintings that are cautiously attributed to Giordano or his studio, has enabled more detailed investigation into the problem regarding copies of Giordano’s famous works. Examples of this are two depictions of The Blessing of Isaac, one sold in New York and another in Sant’Arpino (near Naples), both of which can only be regarded as copies of a lost Giordano composition
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