146 research outputs found
Costatoria (Costatoria?) subrotunda (BITTNER, 1901) a Smithian (Lower Triassic) marker from Tethys
No full textThe authors erect Costatoria costata var. subrotunda (Bittner) from Hungarian Lower Triassic to species level. Its subgeneric position is also discussed here. Thus, Costatoria is represented in the Werfen Formation of Dolomites area by two species: C. (Costatoria?) subrotunda (Bittner) from the upper part of Campil Member (Smithian) and C. (Costatoria) costata (Zenker) from Cencenighe and S. Lucano Members (Spathian). C. subrotunda shows a wide geographic distribution and could be considered as a helpful marker of Smithian age.-Author
High CMRR GaAs single-input to differential convertor
No full textIn this paper a new topology for Single Input to Differential convertors is presented. Among the capabilities of convertors realised with this topology, 6 dB of extra conversion gain respect to a single differential cell and suppression of the common mode can be mentioned. An exact model of the circuit and considerations about design optimisation are also presented
Profiling airport travellers based on their perceptions, satisfaction and intention to recommend food and beverage services
No full textConsuming Food and Beverage is one of the most frequent non-aeronautical activities that passengers enjoy at airports and that significantly contributes to airport profitability. Despite this, there is still limited research aimed at analysing passengers' consumption behaviour of F&B. With the aim to contribute to this somewhat under investigated research area, this study applies a factor-cluster analysis on a sample of 1,139 airport travellers. Results from factor analysis reveal four underlying dimensions of F&B perceptions (i.e. atmospherics, staff quality, value of money, product quality) and one dimension related to satisfaction and intention to recommend airport-based F&B services (i.e. "satisfaction and intention to recommend"). Cluster analysis applied to the scores of the five factors reveal that three clusters exist (i.e. "enthusiastics", "neutrals" and "price sensitives"). Chi-squared analysis tests show that significant differences exist based on socio-demographics (i.e. age, education level, employment status), travel-related variables (i.e. frequency of travelling) and flight-related variables (i.e. flying and check-in modality). Contributions to the theory, managerial implications and limitations to the study are discussed, and suggestions for further research are made
A monolithic 2.5 Gb/s clock and data recovery circuit based on Silicon bipolar technology
No full textA monolithic Clock and Data Recovery (CDR) circuit for SDH STM-16 (2.5 Gb/s) digital receivers has been designed and fabricated using Maxim GST-2 27 GHz Silicon bipolar technology. The main functions carried out by the IC are: signal amplification (40 dB) and limitation, clock recovery and decision. The design is intended to achieve a complete 2.5 Gb/s receiver by using the IC and a low noise preamplifier (transimpedance stage), mounted in a DIL package. The integrated circuit comprises about 400 active devices, used both for analog and digital blocks, and uses two supply voltages of 5 and -4.5 V. The input port is decoupled by external capacitors and matched to 50 Omega using on-chip resistors, whereas clock and data outputs are open collector type. The die size is 2 x 2 mm(2) and the chip has been packaged using a TQFP 48 pins plastic package. Measurements under 2(31)-1 PRBS data stream have shown an input sensitivity below 5 mVpp, rms output jitter below 7 ps and total power consumption of 0.8 W
Estrattore di clock e rigeneratore dati integrato in silicio per SDH STM-16 su fibra ottica
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Echos du fascisme?
No full textEn 2000, les partis d’extrême droite étaient cantonnés aux marges du paysage politique européen. En quelques années, ils ont gagné du terrain dans la plupart des parlements nationaux. Leur avancée, parallèle aux victoires d'Erdoğan en Turquie, de Modi en Inde, de Duterte aux Philippines, de Trump aux États-Unis ou de Bolsonaro au Brésil, a provoqué une radicalisation identitaire d’une partie de la droite traditionnelle. Assistons-nous à une « fascisation » de la vie politique ? Faut-il craindre un « retour du fascisme »
CONFORMATIONALLY RESTRICTED CONGENERS OF HYPOTENSIVE AND PLATELET-AGGREGATION INHIBITORS - 6-ARYL-5-METHYL-4,5-DIHYDRO-3(2H)-PYRIDAZINONES DERIVED FROM 5H-INDENO[1,2-C]PYRIDAZINE
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