1,721,464 research outputs found
Charge and Current Measuring Electronics for Bio-Medical Applications
No full textThe motion of electric charge is involved in several processes such as an electrochemical reaction taking place at a metal/electrolyte interface, the measurement of electrical impedance of a sample between a couple of electrodes or the absorption of a photon in a semiconductor and its conversion into an electron/hole pair (Fig. 1). Consequently, the quantification of the amount of charge collected at a sensing electrode is relevant in a broad variety of applications. This brief tutorial focuses on the challenges and techniques of measuring charge, primarily at the micro-scale, with application in the bio-medical field
Surgical re-utilization of a pulmonary valve graft after failed percutaneous treatment.
No full textJ Heart Valve Dis. 2010 Mar;19(2):260-2.
Surgical re-utilization of a pulmonary valve graft after failed percutaneous treatment.
Vida VL, Speggiorin S, Maschietto N, Padalino MA, Milanesi O, Carminati M, Stellin G.
Source
Department of Pediatric and Congenital Cardiac Surgery, University of Padua, Padua, Italy. [email protected]
Abstract
The case is reported of a 22-year-old woman with severe right ventricular outflow tract (RVOT) homograft regurgitation and stenosis, after the repair of tetralogy of Fallot and complete atrioventricular canal, who was scheduled for percutaneous pulmonary valve implantation. In the catheterization laboratory, immediately after implantation, the stented pulmonary valve became dislodged back into the right ventricle. The patient required an emergency re-sternotomy in the operating room. When the RVOT had been incised the stented valve was rescued and successfully repositioned under direct surgical vision. The patient had an uneventful clinical outcome and was discharged home in good clinical condition, with a new, well-functioning pulmonary valve.
PMID:
20369515
[PubMed - indexed for MEDLINE
Trends and paradigms in the development of miniaturized sensors for environmental monitoring
No full textImpact and trends in embedding field programmable gate arrays and microcontrollers in scientific instrumentation
No full textMicrocontrollers and field-programmable gate arrays have been largely leveraged in scientific instrumentation since decades. Recent advancements in the performance of these programmable digital devices, with hundreds of I/O pins, up to millions of logic cells, >10 Gb/s connectivity, and hundreds of MHz multiple clocks, have been accelerating this trend, extending the range of functions. The diversification of devices from very low-cost 8-bit microcontrollers up to 32-bit ARM-based ones and a system of chip combining programmable logic with processors make them ubiquitous in modern electronic systems, addressing diverse challenges from ultra-low power operation, with sub-μA quiescent current in sleep mode for portable and Internet of Things applications, to high-performance computing, such as in machine vision. In this Review, the main motivations (compactness, re-configurability, parallelization, low latency for sub-ns timing, and real-time control), the possible approaches of the adoption of embedded devices, and the achievable performances are discussed. Relevant examples of applications in opto-electronics, physics experiments, impedance, vibration, and temperature sensing from the recent literature are also reviewed. From this bird-eye view, key paradigms emerge, such as the blurring of boundaries between digital platforms and the pervasiveness of machine learning algorithms, significantly fostered by the possibility to be run in embedded devices for distributing intelligence in the environment
DISPOSITIVO E SISTEMA DI RIVELAZIONE DI RADIAZIONI EMESSE DA UN CAMPIONE IRRAGGIATO CON UN FASCIO DI ECCITAZIONE
No full textAdvances in measurements and instrumentation leveraging embedded systems
No full textThe expression "embedded systems"is used in different contexts and with broad meanings, but in electronics, it refers to systems that contain peripherals and a firmware for local digital data processing, often on a single board. Embedded systems are often associated with the field of computer science, emphasizing the software and programming aspects of systems. However, the progress made on the hardware side cannot be ignored, and without such technological advances, embedded systems would not exist. In fact, the progress in the field of microelectronics drives a constant evolution of variegated digital platforms, which gradually become easier to program and configure, thus reducing the development and prototyping phase and causing a strong impact on different research and application fields
Note sur la répartition professionnelle des salariés dans le cadre de l'agglomération grenobloise
No full textA jo 56 Jb A Jí » » ft ^* « *o » Echelle : 1 division représente 25 salariés pour 1.000. С — Industrie, commerce d'Alimentation E. — Industrie et commerce du Textile, Cuir, Gant, Vêtement 1 G. — Bois, Ameublement, Papeterie I. — Grands magasins (353 sal. 7,9%,), Banques, Assurances, Experts, Sociétés conseils, Publicité, Régisseurs d'immeubles K. — Services personnels, Ebauches communautaires (479 sal. 10,7 %,) M. — Enseignement, Culture, Loisirs O. — Industrie hôtelière, Restaurants, Cafés B. — Production et distribution d'énergie D. — Bâtiment F. — Industries chimiques, Caoutchouc (529 sal. 11,8 as») H. — Sidérurgie, Mécanique, Electricité industr. J. — Transports L. — Administrations, Police N. — Santé • Agglomération grenobloise : 45.099 salariés, 78 % de la population active. 2.987 salariés 7.050 » 1.025 » 2.084 » 1.327 г 3.116 » 595 » 1.394' » 3.674 •» 1.127 » 13.586 » 2.878 » 2.243 » 1.729 » soit » ■» ■» ■» » » 66,9 %, iDi /oo 22,3 %, 46,7 %, 29,7%, 69,7 %, 13,3 %o 31 %, 81,6%, 25,3 %, 301,2%, 64,3%, 50,3%, 38,6%,Carminati M. Note sur la répartition professionnelle des salariés dans le cadre de l'agglomération grenobloise. In: Revue de géographie alpine, tome 40, n°1, 1952. pp. 201-206
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
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