1,721,474 research outputs found
Un approccio materico all’interazione tattile per il design delle interfacce
No full textL’obiettivo di questo contributo è quello di evidenziare come la trasformazione in atto nelle modalità di interazione tattile con gli oggetti coinvolga le “superfici sensibili” inducendo a un ripensamento dell’interfaccia.
Una prima valutazione delle sperimentazioni in atto nella ricostruzione dell’esperienza tattile sulle superfici verrà condotta grazie all’analisi di alcuni casi studio, ricerche nelle quali i materiali tradizionali, uniti alle nuove tecnologie, acquisiscono comportamenti originali e nuove forme di interazione.
Si intende dimostrare che i codici di interazione e i gesti utilizzati comunemente nei dispositivi mobile e negli schermi touch siano usabili, dal punto di vista progettuale, anche in contesti in cui la superficie dell’oggetto non è obbligatoriamente un elemento atto a trasmettere immagini. La superficie si configura così, a tutti gli effetti, come una rete di elementi di interazione che definiscono la fisicità di un involucro in grado di scambiare informazioni attraverso la sue intrinseche caratteristiche materiche.The goal of this paper is to highlight how the continuing transformation of tactile interaction on “touch-sensitive surfaces” is leading to a new idea of interface. The author advances the idea that the gestures and pat- terns of interaction commonly used on mobile devices and touch screens could work well, from a design perspective, even when the surface is not necessarily an element de- signed to display images. In this context, the surface could become a network of interactive elements that serve as a physical envelope with the capacity to exchange information by virtue of their intrinsic material properties
Effects of nebivolol and atenolol on small arteries and microcirculatory endothelium-dependent dilation in hypertensive patients undergoing isometric stress.
No full textEffects of nebivolol and atenolol on small arteries and microcirculatory endothelium-dependent dilation in hypertensive patients undergoing isometric stress. Arosio E1, De Marchi S, Prior M, Zannoni M, Lechi A. Author information Abstract OBJECTIVE: To examine the effects on small arteries and on the cutaneous microcirculatory system of nebivolol and atenolol in hypertensive patients. DESIGN: Twenty hypertensive patients were randomly assigned to receive nebivolol or atenolol in a single-blind, placebo-controlled cross-over study. Piezoelectric plethysmography on the third finger, laser Doppler on the third finger at rest and after iontophoretic administration of acetylcholine, and pressure-heart rate monitoring, were carried out both at rest and during handgrip. The tests were performed 45 min after 5 mg nebivolol or 100 mg atenolol administration, then repeated 2 days later with a placebo and, after a further 2 days, with atenolol or nebivolol again. RESULTS: Both atenolol and nebivolol reduced diastolic blood pressure values and heart rate, as well the increase of blood pressure and heart rate during handgrip. No change was recorded after placebo. Piezoelectric plethysmography showed a significant increase in the ratio between time to peak and total time (PT/TT), calculated on the sphygmic wave, during handgrip (0.295 0.005 versus 0.231 0.015, P<0.005). After nebivolol, a decrease was recorded in rest conditions (0.185 0.008 versus 0.231 0.015, P<0.005) with no statistically significant increase during handgrip, whereas atenolol showed an increase in the PT/TT ratio at rest, with a sustained response during handgrip. Laser Doppler showed an increased response to acetylcholine only after nebivolol. CONCLUSIONS: Nebivolol and atenolol significantly reduced diastolic blood pressure and heart rate, favourably modulating response to handgrip. Nebivolol improved small artery distensibility index. Endothelium-dependent cutaneous vasodilation after acetylcholine demonstrated a lack of response with atenolol whereas nebivolol favourably acts on endothelial function
Paper interaction
No full textcarta e digitale, un rapporto in divenire e non ancora risolto, sono i soggetti di trasformazioni in atto nel mutevole contesto del design dell’interazione. a fronte di diverse esperienze progettuali si è evidenziato come questo processo, verso il digitale, non rientra più nei consueti schemi dettati dall’avvento dell’editoria on-line, ma coinvolge in maniera totale l’artefatto come oggetto interattivo, reale e tangibile. esistono da alcuni anni nel contesto scientifico internazionale alcuni progetti di ricerca che cercano di aggiungere alla carta delle funzioni proprie dell’artefatto digitale implementando nuovi layer informativi e nuove esperienze interattive. il saggio analizza in maniera critica queste neonate direzioni progettuali al fine di comprenderne le potenzialità e focalizzare i metodi del progetto di questi nuovi “oggetti cartacei”.In a relationship still in the making, paper and digital are the subjects of ongoing transformations in the changing context of interaction design. Different design experiences have shown that the process towards digital no longer strictly follows expected patterns dictated by the advent of online publishing, but thoroughly involves the artefact as an interactive object, real and tangible. Over the last few years, in the context of international scientific research, there have been several projects that have sought to map some specific functions of digital artefacts to paper by implementing new layers of information and adding new interactive experiences. This essay critically examines these nascent design directions in order to understand their potential and study the different methods involved in the common project of these new “paper objects”
La metamorfosi dell’oggetto libro dal sistema analogico al digitale
No full textMichele Zannoni
Assistiamo oggi a un profondo cambiamento nel dibattito che negli ultimi vent’anni1 ha investito l’ambito dell’editoria, contrapponendo il contesto progettuale e distributivo del libro tradizionale cartaceo alla nuova editoria digitale.
Considerando l’evoluzione dell’editoria è evidente che, dopo le prime sperimentazioni, risalenti alla fine degli anni Novanta del Novecento, legate ai progetti editoriali in cd-rom, sono trascorsi diversi anni prima che offrisse sul mercato una concreta e diversa alternativa ai modelli tradizionali. Come cambia la lettura di un testo se la narrazione contenutistica è visualizzata su un dispositivo digitale? Qual è il rapporto ottimale tra ergonomia visiva della lettura e display
Effects of ground station delays on plasma calibrations for juno orbit determination
No full textOne of the main objectives of the Juno mission is to unveil the interior structure of Jupiter estimating its gravity field from Juno orbit determination. Applying the dual-frequency plasma calibration scheme to Juno Doppler data an additional dispersive effect on the link was discovered, not previously known or modeled. By using real Juno data collected during a dedicated test tracking pass a significative additional delay in the Ka-band at DSS 25 was estimated. The estimated value is in good agreement with the results obtained by JPL by means of an instrumental test performed at the same ground station
Planet–sun sensor revisited
Full text linkSince the seminal work of Daniele Mortari (“Moon-Sun Attitude Sensor,” Journal of Spacecraft and Rockets, Vol. 34, No. 3, 1997, pp. 360–364), the concept of an attitude sensor using images of illuminated celestial bodies has been pushed forward through the years. The basic idea consists of extracting two independent directions from the image of a celestial body, namely, the camera-to-planet and the planet-to-sun directions. The former is estimated from the center of an ellipse fitted to the imaged limb points and the latter from the symmetry axis of the illuminated region. These assumptions, however, only hold for far-distant spherical targets. In this work, the problem is reformulated in the framework of projective camera transformations of quadrics and conics, and an algorithm estimating the line of sight to the planet and the illumination direction from the limb and terminator ellipses, respectively, is presented. The method is applicable to any ellipsoidlike celestial body having known orientation. The algorithm is first validated on synthetically generated images and then tested using real pictures of Dione and Enceladus satellites gathered from Cassini spacecraft. Results show that the sensor concept returns rms errors in the order of the angular width of a pixel in computing the nadir direction, and subdegree accuracy in computing the sun direction
Activity of cardiopulmonary baroreceptors, peripheral resistance and cutaneous microcirculation in patients with peripheral obstructive arterial disease.
Full text linkAbstract. Arosio E, De Marchi S, Prior M, Zannoni M, Lucchese L, Lechi A (Division of Vascular Medicine and Rehabilitation, University of Verona, Italy). Activity of cardiopulmonary baroreceptors, peripheral resistance and cutaneous microcirculation in patients with peripheral obstructive arterial disease. J Intern Med 2000; 247: 471–478. Objectives. To assess the effects of cardiopulmonary baroreceptors on the haemodynamics of the humeral and common carotid arteries in patients suffering from peripheral artery disease (PAD) and to discover whether the stimulation of these receptors modifies the cutaneous microcirculation in the forearm. Design. We studied a group of patients suffering from peripheral artery disease and two groups as controls. Setting. Patients were examined at the ambulatory for Vascular Research, Division of Vascular Medicine and Rehabilitation, University of Verona. Patients. We studied 15 patients with peripheral artery disease of the lower limbs at Fontaine stage II (group C), 10 free of arterial pathologies (group B) and 10 young people (group A). Main outcome measures. We subjected the patients to passive elevation of the legs and the trunk in a horizontal position with pressure monitoring and measurement of the calibre and flow in the brachial and common carotid arteries using a colourDoppler ultrasound. We also studied the cutaneous microcirculation with laserDoppler flowmetry. Results. During the test, arterial pressure and cardiac frequency remained constant in group A, systolic pressure values showed a slight, but statistically significant increase in group B, whilst the increase in systolic pressure values at this stage was marked in group C. Diastolic pressure values and cardiac frequency remained unchanged in all groups. The calibre of the humeral artery increased in the control groups. Carotid resistance was unchanged in the three groups. Humeral resistance during the test decreased in the two control groups whilst it increased in group C. The number of perfusion units felt in the control groups; no variations in group C. Conclusions. Our study demonstrates, in patients with peripheral artery disease, a reduction in the activity of the cardiopulmonary baroreceptors with an increase in the humeral resistance during the test and impairment of the mechanisms of cutaneous microcirculatory vasoregulation in the forearm
DISPLAYING DANTE’S DIVINE COMEDY MINIATED MANUSCRIPTS IN EXHIBITIONS
No full textAncient manuscripts are part of many collections belonging to historic libraries and museums: due to their fragile nature and
to the difficulties to display most of their contents during exhibitions, their study is often complicated for scholars who also
need generally special permissions to examine them, mostly for a limited time window. Beginning from these premises, this
paper introduces the outcomes of the digital replication and presentation of three manuscripts related to Dante’s Divine
Comedy, as proposed on a real exhibition, “Dall’Alma Mater al Mondo. Dante at the University of Bologna”, held in 2021. Some
of the principles related to the production of their replicas and the fruition of their contents through dedicated applications
targeted to visitors and scholars are presented, with care to the reproduction of details such as the ability to explore 3D
replicas of detailed elected pages or to browse many of them on dedicated touch screens
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