929 research outputs found
Surface-micromachined Silicon Carbide Pirani Gauges for Harsh Environments
No full textThe application of pressure sensors in harsh environments is typically hindered by the stability of the material over long periods of time. This work focuses on the design and fabrication of surface micromachined Pirani gauges which are designed to be compatible with state-of-the-art Silicon Carbide CMOS technology. Such an integrated platform would boost harsh environment compatibility while reducing the required packaging complexity. An analytical model was derived describing the design variables of the Pirani gauges followed by Finite Element Analysis. The Pirani gauges were fabricated in a CMOS compatible cleanroom with a process employing only three masks, thus suitable for mass production. The SiC-based Pirani gauge is far more competitive than the traditional Si-based Pirani gauge in terms of endurance in high-temperature environments. From 25°C to 650°C, the gauge shows a reproducible response to pressure changes and has a maximum sensitivity of /Pa at room temperature, and of /Pa at 650°C. Additionally, some of the gauges were demonstrated to operate at temperatures up to 750°C.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsQN/Zandbergen La
Cladochaeta atlantica Pirani & Amorim 2016
No full textCladochaeta atlantica Pirani & Amorim, 2016 (Figs. 27–28) Cladochaeta atlantica Pirani & Amorim, 2016: 327 –328, Figs. 24 A–F, 25 A–C, 34 A, 35 L Material examined. BRAZIL: Espírito Santo: Estação Biológica de Santa Lúcia, Santa Teresa, Atlantic Forest, 550m, dense ombrophilous montane forest, T. G. Kloss [collector], reared from spider egg sacs of the spider Cryptachaea migrans, 23.X.2014 (1 ♂), 31.X.2014 (1 ♂), 04.XII.2014 (1 ♀) (all deposited in MPEG). Description of female. Differs from the description of the male showed by Pirani & Amorim (2016) as follow: Female terminalia (Fig. 28): Hypoproct narrowed distally, with microtrichosity and setae concentrated on posterior margin. Apical sternite wider than high, entire, with posterior margin bilobed, with three setae and microtrichosity restricted to the lobes. Penultimate sternite broad, shield-like, with a deep median cleft with almost parallel inner edges in posterior margin, without setae. Distribution. NEOTROPICAL—Brazil (Espírito Santo, São Paulo). Remarks. The female terminalia of C. atlantica is similar to that of C. labidia Grimaldi & Nguyen in having apical sternite with posterior margin entire and bilobed, but the number of setae in the lobes are different between these species (three in C. atalntica and about eight in C. labidia). Biology. The specimens of C. atlantica were obtained from the spider egg sacs of Cryptachaea migrans (Keyserling, 1884) (Araneae: Theridiidae) (Fig. 29) collected in a montane ombrophilous Atlantic Forest at an altitude of 550 m. This spider utilizes dry leaf as retreat (Figs. 29–30). Of 124 collected egg sacs, only three were attacked by this fly. One egg mass was completely consumed by the fly larva, while the other two were partially consumed and from these emerged spiderlings. This is the first record of a species of Cladochaeta attacking a spider egg sac. The breeding habits of drosphilids are diversified, but there are few records of these flies parasitizing the egg sacs of spiders, which are restricted to some species of Scaptomyza Hardy (subgenus Titanochaeta Knab) in the Hawaiian Islands and Australia, that attack Thomisidae eggs (Wirth 1952, Hardy 1965, Austin 1985).Published as part of Carvalho-Filho, Fernando Da Silva, Pirani, Gabriela & Kloss, Thiago Gechel, 2018, A new species and notes on unusual natural history of Cladochaeta Coquillett, 1900 (Diptera: Drosophilidae), pp. 483-496 in Zootaxa 4410 (3) on page 491, DOI: 10.11646/zootaxa.4410.3.3, http://zenodo.org/record/122179
A miniaturized low power Pirani pressure sensor based on suspended graphene
No full textWorlds first graphene-based Pirani pressure sensor is presented. Due to the decreased area and low thickness, the graphene-based Pirani pressure sensor allows for low power applications down to 0.9 mW. Using an innovative, transfer-free process, suspended graphene beams are realized. This allows for up to 100x miniaturization of the pressure sensor area, while enabling wafer-scale fabrication. The response of the miniaturized pressure sensor is similar to that of the much larger state-of-the-art Si-based Pirani pressure sensors, demonstrating the potential of graphene-based Pirani sensors.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Electronic Components, Technology and MaterialsQN/Steeneken LabQN/van der Zant LabDynamics of Micro and Nano System
Per una rilettura dei patti tra il comune di Fermo e i signori del contado del 1229
No full textThe starting point of this artitcle is represented by a paper that Giacinto Pagnani
published in 1972 in Studi Maceratesi (Patti fra il comune di Fermo e i nobili del
contado nel 1229). Along the lines of the most recent historiographical approaches,
the author offers a new interpretation of the document studied by Pagnani more than
40 years ago. A new edition of the document is also provide
LEGGERE, COMPRENDERE, PRODURRE, RIELABORARE TESTI DI TIPO NARRATIVO:UN'ESPERIENZA DIDATTICA
No full textFabriano in età comunale. Nascita e affermazione di una città manifatturiera
No full textFa parte della Collana «La società medievale. Saggi e ricerche», a cura di G. CHERUBINI e G. PINTO
Sezione monografica sull’opera dell’ing. Quadrio Ferruccio Pirani e bibliografia ragionata
No full textQuadrio Ferruccio Pirani è uno dei massimi esponenti dell’architettura a Roma nei primi decenni del Novecento e applicail suo talentoin particolare all’edilizia sovvenzionata e alla definizione di una tipologia attuale e sostenibile per l’edilizia economica e popolare. Il gruppo di lavoro ha mirato, sotto la guida dello storico dell’architettura Livio Toschi, esperto in materia, alla ricostruzione completa dell’opera di Pirani e al regesto delle opere, nonché al completamento della bibliografia intorno alla sua figura. Sono stati scandagliai gli archivi del comune di Roma, l’archivio di Stato di Roma e gli archivi comunali di Jesi e dei pasesi sui colli jesini dove Pirani era nato e dove aveva lavorato in diverse occasioni
Multi-layer graphene Pirani pressure sensors
No full textThe operating principle of Pirani pressure sensors is based on the pressure dependence of a suspended strip's electrical conductivity, caused by the thermal conductance of the surrounding gas which changes the Joule heating of the strip. To realize such sensors, not only materials with high temperature dependent electrical conductivity are required, but also minimization of the suspended strip dimensions is essential to maximize the responsivity and minimize the power consumption. Due to this, nanomaterials are especially attractive for this application. Here, we demonstrate the use of a multi-layer suspended graphene strip as a Pirani pressure sensor and compare its behavior with existing models. A clear pressure dependence of the strip's electrical resistance is observed, with a maximum relative change of 2.75% between 1 and 1000 mbar and a power consumption of 8.5 mW. The use of graphene enables miniaturization of the device footprint by 100 times compared to state-of-the-art. Moreover, miniaturization allows for lower power consumption and/or higher responsivity and the sensor's nanogap enables operation near atmospheric pressure that can be used in applications such as barometers for altitude measurement. Furthermore, we demonstrate that the sensor response depends on the type of gas molecules, which opens up the way to selective gas sensing applications. Finally, the graphene synthesis technology is compatible with wafer-scale fabrication, potentially enabling future chip-level integration with readout electronics.Electronic Components, Technology and MaterialsPhotovoltaic Materials and DevicesQN/van der Zant LabDynamics of Micro and Nano SystemsQN/Steeneken La
Statuti, comunità, territori nelle Marche centromeridionali (secoli XIV-XVI)
No full textIl testo si prefigge di descrivere il panorama ‘configurazionale’ delle fonti normative delle comunità urbane e rurali, inquadrandole nel precipuo contesto territoriale e nella loro evoluzione cronologica. Dopo una rapida rassegna sulla produzione storiografica e sull’edizione delle fonti, l’analisi si concentrerà su due questioni: la prima incentrata sul rapporto fra la geografia dei poteri territoriali e la mappa della produzione statutaria; la seconda focalizzata sulla forma e sulla struttura degli statuti delle comunità minori
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