Search results for "circuits"
showing 10 items of 358 documents
Unfolding of saddle-nodes and their Dulac time
2016
Altres ajuts: UNAB10-4E-378, co-funded by ERDF "A way to build Europe" and by the French ANR-11-BS01-0009 STAAVF. In this paper we study unfoldings of saddle-nodes and their Dulac time. By unfolding a saddle-node, saddles and nodes appear. In the first result (Theorem A) we give a uniform asymptotic expansion of the trajectories arriving at the node. Uniformity is with respect to all parameters including the unfolding parameter bringing the node to a saddle-node and a parameter belonging to a space of functions. In the second part, we apply this first result for proving a regularity result (Theorem B) on the Dulac time (time of Dulac map) of an unfolding of a saddle-node. This result is a b…
Vers un concept juridique d’agriculture de proximité
2016
International audience; La ville est traditionnellement pour les ruralistes une zone d’ombre qui obscurcit le destin de l’agriculture. Comme en photographie, lorsque le contraste d’une scène est trop fort, une partie de l’image ressort « sous-exposée » et une autre « sur-exposée ». Ainsi pendant longtemps, il n’a pas été possible de voir ensemble et harmonieusement l’agriculture et la ville.Dans l’inconscient collectif, la distinction du rural et de l’urbain est structurante : elle renvoie à des identités propres, généralement opposées. On doit à la révolution industrielle du XIXème la scission de la campagne et de la ville en deux univers clos et complémentaires. L’espace rural a alors été…
Agriculture et ville : vers de nouvelles relations juridiques
2016
International audience; Historiquement perçues comme éloignées l'une de l'autre, l'agriculture et la ville sont en voie de constant rapprochement. L'étalement physique des agglomérations, avec leurs zones périurbaines, conjugué à la mobilité accrue des citadins comme des ruraux, réduisent les distances entre les mondes rural et urbain. Si le phénomène provoque, entre l'agriculture et la ville, des rapports d'opposition, il fait aussi naître des rapports de séduction se concluant par des projets agri-urbains. Reste à les concevoir et les organiser juridiquement, enjeu qui n'a jamais été véritablement posé. Or la difficulté est réelle de marier deux droits, celui des villes et celui des champ…
All-Optical Measurement of Background, Amplitude and Timing Jitter for high speed pulse trains or prbs sequences using autocorrelation function
2006
We present a simple method for all-optical measurements of background, amplitude- and timing-jitter of ultra high speed pulse trains or prbs sequences using the jitter dependences of the intercorrelation-peak shape.
L’approche par les ressources : pour une vision renouvelée des rapports entre économie et territoire
2016
International audience
Smart NeuroCam with High Level Configuration Tool
2017
Thème de la conférence : New Circuits and Systems; International audience
Long-Term Potentiation in the Neonatal Rat Barrel Cortex In Vivo
2012
Long-term potentiation (LTP) is important for the activity-dependent formation of early cortical circuits. In the neonatal rodent barrel cortex, LTP has been studied only in vitro . We combined voltage-sensitive dye imaging with extracellular multielectrode recordings to study whisker stimulation-induced LTP in the whisker-to-barrel cortex pathway of the neonatal rat barrel cortex in vivo . Single whisker stimulation at 2 Hz for 10 min induced an age-dependent expression of LTP in postnatal day (P) 0 to P14 rats, with the strongest expression of LTP at P3–P5. The magnitude of LTP was largest in the activated barrel-related column, smaller in the surrounding septal region, and no LTP could b…
Novel voltage-controlled conditioning circuit applied to the ISFETs temporary drift and thermal dependency
2003
This paper describes a novel conditioning circuit applied to ion-sensitive field-effect transistors/membrane-ion-sensitive field-effect transistors (ISFETs/MEMFETs) sensors. The novel conditioning circuit allows the sensor polarization with the needed either voltage or current required in each application, thanks to two completely independent voltage-controlled blocks (current and voltage blocks). The control of the voltage block is the most critical point in our design because the voltage block maintains the sensor feedback stable, avoiding the thermal and temporary drifts of the sensor feedback.
Novel Three-Phase Multilevel Inverter With Reduced Components for Low- and High-Voltage Applications
2021
In this article, a novel multilevel topology for three-phase applications, having three-level and hybrid N -level modular configurations, enabling low-, medium-, and high-voltage operations, is presented. The proposed topology has several attractive features, namely reduced component count, being capacitor-, inductor-, and diode-free, lowering cost, control-complexity, and size, and can operate in a wide range of voltages and powers. Selected simulation and experimental results are presented to verify the performance of the proposed topology. Further, the overall efficiency of the topology and loss distribution in switches are studied. Finally, the key features of the proposed topology in t…
Preliminary test on a cascode switch for high-frequency applications
2020
Nowadays, an increasing electrification level is being addressed towards different sectors, such as transportation and industrial electronics. To bear that, high speed electrical machines represent a mature technology in different application fields, e.g. avionics, automotive, compressors and spindles. In order to guarantee high speed while keeping high power quality without adopting bulky filtering circuits, DC-AC converters shall be controlled by means of high Pulse Width Modulation (PWM) frequencies. In addition to the emerging switching device technologies, such as those based on Silicon-Carbide (SiC) and Gallium-Nitride (GaN), alternative circuital topologies are crucial in order to co…