Electrical Interfacing Circuit Discussion of Galloping-based Piezoelectric Energy Harvester

AbstractThe equivalent circuit and electrical interfacing circuit of agalloping-based piezoelectric flag energy harvester is discussed and the nonlinear synchronized switching technique is used to increase the power.Energy harvesting from ambient is highly focused and by using a cantilever beam to convert the vibration energy is the most popular topics. Except using cantilever beam, piezoelectric flag or plate converted the flow energy has been widely invested. As the interfacing circuit is the important design part to increase the power output, in this paper,several interfacing circuit including standard DC approach, SSHI technique and transformer-based SSHI technique are proposed and compared. Simulations and experimental results show the optimal interfacing circuit in piezoelectric flow energy harveste

Self-Powered Electronics for Piezoelectric Energy Harvesting Devices

International audienc

The United Nations and the Human Rights Issue

This paper demonstrates a new class of bugs that is likely to occur in enterprise OpenFlow deployments. In particular, step-by-step, reactive establishment of paths can cause network-wide inconsistencies or performance- and space-related inefficiencies. The cause for this behavior is inconsistent packet processing: as the packets travel through the network they do not encounter consistent state at the OpenFlow controller. To mitigate this problem, we propose to use transactional semantics at the controller to achieve consistent packet processing. We detail the challenges in achieving this goal (including the inability to directly apply database techniques), as well as a potentially promising approach. In particular, we envision the use of multi-commit transactions that could provide the necessary serialization and isolation properties without excessively reducing network performance.QC 20140707</p

Foreword: The Nature of Discretion

Power consumption has become a critical issue in large scale clusters. Existing solutions for addressing the servers’ energy consumption suggest “shrinking” the set of active machines, at least until the more power-proport-ional hardware devices become available. This paper demonstrates that leveraging the sleeping state, however, may lead to unacceptably poor performance and low data availability if the distributed services are not aware of the power management’s actions. Therefore, we present an architecture for cluster services in which the deployed services overcome this problem by actively participating in any action taken by the power management. We propose, implement, and evaluate modifications for the Hadoop Distributed File System and the MapReduce clone that make them capable of operating efficiently under limited power budgets.QC 20140707</p

Consistent Packet Processing - Because Consistent Updates Are Not Enough

In this poster and demo, we showcase a new class of problems that can occur due to inconsistent packet processing at an OpenFlow controller. We proceed to outline a potential solution

Floristički sastav i prinos biomase travnjaka Danthonietum calycinae pod uticajem đubrenja i kalcizacije

The aim of this study was evaluated change of botanical composition and dry matter yield influenced by different fertilizers (control, P60K60, N.60P60K60) and lime (without lime and 1000 kg ha-1 lime) of Danthonietum calycinae grassland type, in central part of Serbia. Nitrogen fertilisation treatments led to an increase of grass species, but also decreased plants from other families. Tretmant P60K60 with lime stimulated an increase of legumes in biomass in first and second year of investigation. Aplication of nitrogen increase forage yield in both years of investigation. Effect of P60K60 tretmans and lime on increasing dry matter yield was observed in second year.Cilj rada je bio ispitivanje uticaja đubrenja i kalcizacije na floristički sastav i prinos biljne zajednice Danthonietum calycinae, u centralnom delu Srbije. Ispitivani su tretmani đubrenja (kontrola, P60K60 i N60P60K60) i kalcifikacije (bez kreča i 1000 kg ha-1). Na tretmanina na kojima je unešen mineralni azot došlo je do porasta udela trava, a pada udela biljaka ostalih familija. Najpovoljniji uslovi za razvoj leguminoza bili su na tretmanima PK sa krečom, u obe godine istraživanja. Povoljan uticaj mineralnog azota uočen je već u prvoj godini, dok je unošenje fosfornih i kalijumovih đubriva dalo efekta na prinos tek u drugoj godini istraživanja

Apports des matériaux piézoélectriques pour l'intégration hybride et monolithique des transformateurs

Works presented in this report concerns the problems of electric devices integration in general and passive components integration in particular aiming to carry out the realization of integrated conversion systems. In a first part, the study and the characterization of piezoelectric transformers exhibiting millimetre-length is tackled for supply of fractions of Watts to few Watts applications. This transformer is well adopted to MOSFET & IGBT gate drive circuits integrated on a PCB substrate. This application is fully detailed in the report. In a second part, we have been interested in the problem of integration of piezoelectric micro-transformers in a silicon substrate for supplying micro-systems. We have been proposed new micro-transformer structure realized with AlN and PZT thin layers deposed by sputtering. These manufacturing process are compatible with silicon technologies and with the constraints of micro-machining. An original prototype has been realized and characterized.Le travail présenté dans ce mémoire s'inscrit dans le cadre des problèmes d'intégration des dispositifs électriques en général et des composants passifs en particulier permettant de réaliser des systèmes de conversion intégrés. Le travail débute avec l'étude et la caractérisation de transformateurs piézoélectriques de taille " méso " de quelques fractions de watts à quelques watts destinées à la mise en œuvre d'une commande rapprochée de transistors de puissance MOSFET & IGBT intégrée sur un substrat en PCB. Il se place ensuite dans la problématique de l'intégration sur silicium de micro-transformateur piézoélectriques pour des systèmes d'alimentation électrique de quelques micro-watts. L'objectif est d'établir de nouvelles structures de micro-transformateur, exploitant des couches minces d'AlN et de PZT déposées par pulvérisation cathodique, dont les étapes de fabrication sont compatibles avec les technologies et les contraintes de la microélectronique

Apports des matériaux piézoélectriques pour l'intégration hybride et monolithique des transformateurs

Works presented in this report concerns the problems of electric devices integration in general and passive components integration in particular aiming to carry out the realization of integrated conversion systems. In a first part, the study and the characterization of piezoelectric transformers exhibiting millimetre-length is tackled for supply of fractions of Watts to few Watts applications. This transformer is well adopted to MOSFET & IGBT gate drive circuits integrated on a PCB substrate. This application is fully detailed in the report. In a second part, we have been interested in the problem of integration of piezoelectric micro-transformers in a silicon substrate for supplying micro-systems. We have been proposed new micro-transformer structure realized with AlN and PZT thin layers deposed by sputtering. These manufacturing process are compatible with silicon technologies and with the constraints of micro-machining. An original prototype has been realized and characterized.Le travail présenté dans ce mémoire s'inscrit dans le cadre des problèmes d'intégration des dispositifs électriques en général et des composants passifs en particulier permettant de réaliser des systèmes de conversion intégrés. Le travail débute avec l'étude et la caractérisation de transformateurs piézoélectriques de taille " méso " de quelques fractions de watts à quelques watts destinées à la mise en œuvre d'une commande rapprochée de transistors de puissance MOSFET & IGBT intégrée sur un substrat en PCB. Il se place ensuite dans la problématique de l'intégration sur silicium de micro-transformateur piézoélectriques pour des systèmes d'alimentation électrique de quelques micro-watts. L'objectif est d'établir de nouvelles structures de micro-transformateur, exploitant des couches minces d'AlN et de PZT déposées par pulvérisation cathodique, dont les étapes de fabrication sont compatibles avec les technologies et les contraintes de la microélectronique

Micro-transformateur piézoélectrique intégré sur substrat en silicium

National audienc