1,722,006 research outputs found
The evolution of car aerodynamics
No full textPininfarina's wind tunnel tests based on the FIAT '1' segment for car aerodynamics, were the ultimate basis of the development of cars in this connection such as the UNO (1983). This is revealed by an illustrated literature survey. Thus reduction of the vortex flow at the rear of the vehicle, and also of transverse vortex flow, has tended to generate a ring vortex mechanism. This latter mechanism can further reduce drag by ca. 30% or more compared with vehicles at present on the road. This main possibility of improving aerodynamics can be supplemented by improved internal flow, especially ventilation, greater directional stability, reduced vehicle noise
Tarjeta Postal de Alberto Morelli a Pedro Dorado Montero
No full textTarjeta Postal del jurista italiano D. Alberto Morelli, a D. Pedro Dorado Montero, agradeciéndole un trabajo
A new aerodynamic approach to advanced automobile basic shapes
No full textAerodynamic basic shapes are generally intended as non wheeled bodies moving at a small distance from the ground, effective and suitable for automobile applications. The shape is furthermore designed to comply with requirements other than aerodynamic accomodating occupants, luggage and mechanical parts within as small as possible overall dimensions. However, even though the basic body drag coefficient can be as low as 0.05, the addition of wheels may increase the body drag, by two to three times. The new approach starts from the definition of aerodynamic criteria such as total lift close to zero, the pitching moment sign and value consistent with road holding and stability, a reduced sensitivity to side wind, gradual variation of the cross sections, etc. Then, the presence of the wheels is taken into account in order to reduce their aerodynamic interference with the body, and to manage the wake mechanisms in order to recover the kinetic energy of the flow without fitting the body with a solid diffuser: in fact, this would increase the car length without contributing much to the usable space. Theoretical and experimental work leading to a new shape particularly short in the rear part and able to improve both the accomodation of passengers in the rear seats and the visibility outside - at present a major drawback of actual cars - are shown together with aerodynamic drag benefits. Other advantages resulting from the application of the method are finally discussed
Tarjeta Postal de Alberto Morelli a Pedro Dorado Montero
No full textTarjeta Postal del jurista italiano D. Alberto Morelli, a D. Pedro Dorado Montero, agradeciéndole una referencia bibliográfica aparecida en la "Enciclopedia Jurídica"
Predator-prey interaction: effects of the substances released by the prey Euplotes crassus (Protozoa, Ciliata) on the predator, Litonotus lamella (Protozoa, Ciliata)
No full text
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“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
La patera di Rennes: analisi numismatica
No full textIl contributo, prendendo l’avvio dal contesto di rinvenimento e dai primi studi condotti sulla cosiddetta patera di Rennes, si incentra sull’analisi della decorazione che caratterizza il prezioso manufatto aureo, rinvenuto fortuitamente a Rennes (Bretagna) nel 1774 e oggi conservato presso il Département des Monnaies, médailles et antiques della Bibliothèque nationale de France (inv. 56-94).
Nell’intento di interpretare il significato simbolico sotteso alla natura e alle caratteristiche estrinseche del reperto, lo studio analizza, in particolare, l’apparato decorativo monetale, costituito da sedici aurei, incastonati nella fascia più esterna dell’oggetto.
Partendo dalla catalogazione delle singole monete, l’indagine procede con un esame di tipo formale, evidenziando come la successione degli esemplari - tutti esposti tramite il lato di dritto, recante l’effigie di personaggi maschili e femminili della dinastia antonino-severiana - non segua l’ordine cronologico delle emissioni (da Adriano a Geta), ma scandisca una sequenza preordinata, ripetuta quattro volte. In questo senso, l’ordine effettivo degli esemplari appare individuato dall’alternanza dei ritratti monetali dei membri della domus imperiale, disposti secondo lo schema Augusto senior-Augusto iunior o Cesare-Augusto senior-Augusta.
Lo studio, condotto attraverso un’analisi minuziosa, ha rilevato l’esistenza di un impianto concepito meticolosamente in relazione non solo alla scelta, ma anche alla predisposizione delle monete, determinato dal preciso intento di creare collegamenti e richiami ricorrenti tra i personaggi raffigurati, nell’ottica della ricostruzione dei legami di legittimazione della successione imperiale.
Le monete d’oro reimpiegate nella decorazione della patera evidenziano, dunque, la costruzione di un vero e proprio percorso ideologico, finalizzato alla celebrazione della dinastia severiana, consolidatasi attraverso la procedura di autoadozione all’interno della domus antonina promossa da Settimio Severo
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