Supragaussian-fluctuaction energy harvesting by piezoelectric method, through monostable squarewell-like oscillators: an electronic analogy

Se presenta un análogo electrónico de un oscilador monoestable de tipo pozo cuadrado, propuesto para cosechar energía del ruido mediante transducción piezoeléctrica. Se supone un ruido altamente correlacionado y con estadística supra Gaussiana, que se controla mediante un parámetro q. Éste es sintetizado y enviado a través de un circuito electrónico en el que se utiliza un diodo Zener como análogo del potencial tipo pozo cuadrado, para observar cómo varía la tensión cuadrática media entregada a la carga a medida que el ruido se aleja de uno Gaussiano. Los resultados muestran que al crecer q por encima de 1 (correspondiente a estadística Gaussiana) la tensión cuadrática media se incrementa, de modo que el Zener actúa efectivamente como selector de grandes excursiones.An electronic analog is introduced of a square-well monostable oscillator, proposed for noise energy harvesting using piezoelectric transduction. A highly correlated noise is assumed, whose supra Gaussian statistics is controlled by a parameter q. This is synthesized and sent through an electronic circuit in which a Zener diode is used as an analogue of the square-well potential, to observe how the rms voltage delivered to the load varies as the noise departs from Gaussian. The results show that as q grows above 1 (corresponding to Gaussian statistics) the rms voltage increases, so that the Zener effectively acts as selector of large excursions.Fil: Peña Rosselló, Julián Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Deza, J. I.. Universidad Politecnica de Catalunya; EspañaFil: Wio, H. S.. Consejo Superior de Investigaciones Cientificas; EspañaFil: Deza, R. R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; Argentin

Energy harvesting from noise

Se realiza una serie de experimentos tendientes a contribuir al diseño y prototipo de una nueva clase de generadores para los dispositivos electrónicos de bajo consumo (telefonía móvil, sensores remotos, etc), capaces de extraer la energía del ambiente cuando y donde se necesita. En el primer experimento se reprodujo una propuesta de la literatura, excitando al sistema con ruidos sintetizados digital y analógicamente para que tengan distintas características espectrales y estadísticas. Los resultados preliminares indican un incremento en la potencia generada cuando la estadística es de tipo Lévy. En el segundo (en fase de prueba) abordamos un diseño alternativo original, basado en inducción electromagnética.A series of experiments is performed to help design and prototype a new class of generators for low-power electronic devices (mobile phones, remote sensing, etc.) capable of extracting energy from the environment when and where needed. In the first experiment a proposal in the literature was repeated, exciting the system with digitally-and analogically-synthesized sounds to have different spectral and statistical characteristics. Preliminary results indicate an increase in generated power when the statistics is of Lévy type. In the second (in test phase), an original alternative design based on electromagnetic induction is approachedFil: Peña Rosselló, J. I.. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales (UNMdP-FCEyN). Buenos Aires. ArgentinaFil: Murias, G. F.. Universidad Nacional de Mar del Plata. Facultad de Ingeniería (UNMdP-FI). Buenos Aires. ArgentinaFil: Deza, Roberto Raúl. Universidad Nacional de Mar del Plata - CONICET. Instituto de Investigaciones Físicas de Mar del Plata (IFIMAR). Buenos Aires. Argentin

Piezoelectric energy harvesting from colored fat-tailed fluctuations: An electronic analogy

Aiming to optimize piezoelectric energy harvesting from strongly col-ored fat-tailed fluctuations, we have recently studied the performance ofa monostable inertial device under a noise whose statistics depends on aparameter q (bounded for q 1).We have studied the interplay between the potential shape (interpolatingbetween square-well and harmonic-like behaviors) and the noise’s statis-tics and spectrum, and showed that its output power grows as q increasesabove 1. We now report a real experiment on an electronic analog of theproposed system, which sheds light on its operating principle. Received: 20 Novembre 2014, Accepted: 7 September 2015; Edited by: C. A. Condat, G. J. Sibona; DOI:http://dx.doi.org/10.4279/PIP.070014 Cite as: J I Peña Rosselló, R Deza, J . Deza, H S Wio, Papers in Physics 7, 070014 (2015

Piezoelectric energy harvesting from colored fat-tailed fluctuations: An electronic analogy

Aiming to optimize piezoelectric energy harvesting from strongly colored fat-tailed fluctuations, we have recently studied the performance of a monostable inertial device under a noise whose statistics depends on a parameter $q$ (bounded for $q1$). We have studied the interplay between the potential shape (interpolating between square-well and harmonic-like behaviors) and the noise's statistics and spectrum, and showed that its output power grows as $q$ increases above 1. We now report a real experiment on an electronic analog of the proposed system, which sheds light on its operating principle.Comment: 4 pages, 5 figure

Harvesting Energy from fat-tail random vibrations

We illustrate how applied and computational mathematics tools in the field of probability, statistics and stochastic processes are applied in the preliminary design stage of an expectedly typical 21th century (nanotech) industrial process: the fabrication of carpets, paints and networks able to harvest energy from random vibrations.Fil: Peña Rosselló, Julián Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Dell'erba, Matias German. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Deza, R. R.. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Físicas de Mar del Plata; ArgentinaFil: Deza, J. I.. Universidad Politecnica de Catalunya; EspañaFil: Wio, H. S.. Consejo Superior de Investigaciones Cientificas. Instituto de Física de Cantabria; Españ

High metabolomic microdiversity within co-occurring isolates of the extremely halophilic bacterium Salinibacter ruber

Salinibacter ruber is an extremely halophilic member of the Bacteroidetes that thrives in crystallizer ponds worldwide. Here, we have analyzed two sets of 22 and 35 co-occurring S. ruber strains, newly isolated respectively, from 100 microliters water samples from crystalizer ponds in Santa Pola and Mallorca, located in coastal and inland Mediterranean Spain and 350 km apart from each other. A set of old strains isolated from the same setting were included in the analysis. Genomic and taxonomy relatedness of the strains were analyzed by means of PFGE and MALDI-TOF, respectively, while their metabolomic potential was explored with high resolution ion cyclotron resonance Fourier transform mass spectrometry (ICR-FT/MS). Overall our results show a phylogenetically very homogeneous species expressing a very diverse metabolomic pool. The combination of MALDI-TOF and PFGE provides, for the newly isolated strains, the same scenario presented by the previous studies of intra-specific diversity of S. ruber using a more restricted number of strains: the species seems to be very homogeneous at the ribosomal level while the genomic diversity encountered was rather high since no identical genome patterns could be retrieved from each of the samples. The high analytical mass resolution of ICR-FT/MS enabled the description of thousands of putative metabolites from which to date only few can be annotated in databases. Some metabolomic differences, mainly related to lipid metabolism and antibiotic-related compounds, provided enough specificity to delineate different clusters within the co-occurring strains. In addition, metabolomic differences were found between old and new strains isolated from the same ponds that could be related to extended exposure to laboratory conditions.This work was supported by the projects CLG2009-12651-C02-01 and 02; and CE-CSD2007-0005 of the Spanish Ministry of Science and Innovation, and all three projects were also co-financed with FEDER support from the European Union. JBE was financed by the Government of the Balearic Islands, Ministry of Economy and Finances

Fine-scale evolution: Genomic, phenotypic and ecological differentiation in two coexisting Salinibacter ruber strains.

Genomic and metagenomic data indicate a high degree of genomic variation within microbial populations, although the ecological and evolutive meaning of this microdiversity remains unknown. Microevolution analyses, including genomic and experimental approaches, are so far very scarce for non-pathogenic bacteria. In this study, we compare the genomes, metabolomes and selected ecological traits of the strains M8 and M31 of the hyperhalophilic bacterium Salinibacter ruber that contain ribosomal RNA (rRNA) gene and intergenic regions that are identical in sequence and were simultaneously isolated from a Mediterranean solar saltern. Comparative analyses indicate that S. ruber genomes present a mosaic structure with conserved and hypervariable regions (HVRs). The HVRs or genomic islands, are enriched in transposases, genes related to surface properties, strain-specific genes and highly divergent orthologous. However, the many indels outside the HVRs indicate that genome plasticity extends beyond them. Overall, 10% of the genes encoded in the M8 genome are absent from M31 and could stem from recent acquisitions. S. ruber genomes also harbor 34 genes located outside HVRs that are transcribed during standard growth and probably derive from lateral gene transfers with Archaea preceding the M8/M31 divergence. Metabolomic analyses, phage susceptibility and competition experiments indicate that these genomic differences cannot be considered neutral from an ecological perspective. The results point to the avoidance of competition by micro-niche adaptation and response to viral predation as putative major forces that drive microevolution within these Salinibacter strains. In addition, this work highlights the extent of bacterial functional diversity and environmental adaptation, beyond the resolution of the 16S rRNA and internal transcribed spacers regions