LaLiga Santander* Data updated as of February 13, 2020 Not surprisingly, that football that sometimes grants second chances could have brought together in January the reunion between the two, when the Hispanics were looking forward and had 20 million, just what Benfica asked for RdT. But Espanyol had anticipated, convincing him and the Lisbon club since mid-December, so those of Lopetegui ended up opting for Youssef En Nesyri for that same amount. Lopetegui numbers are not right. Not now, not last season. Until the dismissal of the coach at the head of Real Madrid, after the tenth day, only Karim Benzema had more goals (four) than the three of Thomas He had already harvested in the Rayo, where he would end up with 14 goals, the same ones that all the white team wore when the club turned to Santiago Solari to relieve him.“Benzema is Benzema and I am Raúl de Tomás, we are completely different“, the last season the perico striker resolved, fleeing (rather, showing his tiredness) from comparisons. Until August 24, 2018, very close to the end of the summer market, no Raúl de Tomás left Real Madrid’s discipline. His nth transfer, but not any one. And not because it would be the last one before being transferred a year later to Benfica, since he did not know it. But because the white coach did count on him. It was Julen Lopetegui.“I could have been there, Lopetegui wanted me to stay“, revealed the striker in January 2019. And added:”But I didn’t want my function to be just sitting all year“And hence he agreed to return to Rayo Vallecano, with which unlike Real Madrid he did make his debut in Primera. Now the player and coach faces will be seen, but with the equipment changed. Tomás, counting goals for matches at Espanyol. And Lopetegui, surfing a crisis of results in Seville. LaLiga Santander* Data updated as of February 13, 2020 And this season, with the great caveat that there are still 15 games left to play, time is also proving RdT. He has four goals in as many days, as many as the ‘pichichi’ of his country, Luuk de Jong, throughout the season. For its part, In Nesyri has a loner both in Seville, yes, last day against Celta. And without forgetting that even in Leganés he stabbed Espanyol on December 22, with the 2-0 that meant the dismissal of Pablo Machín, a Sevilla coach a year ago.
Source:https://www.osa.org/en-us/about_osa/newsroom/news_releases/2018/compact_fiber_laser_may_enable_wearable_tech_and_b/ Reviewed by James Ives, M.Psych. (Editor)Sep 18 2018By creating a new twist on fiber optic sensors, researchers in China have developed a smart, flexible photoacoustic imaging technique that may have potential applications in wearable devices, instrumentation and medical diagnostics.Lead researcher Long Jin from the Institute of Photonics Technology at Jinan University in Guangzhou will present the new fiber laser-based ultrasound sensor at the OSA Frontiers in Optics + Laser Science APS/DLS conference, being held 16-20 Sept., 2018 in Washington, D.C. Jin will also present the results of a study using an in vivo photoacoustic microscope.The presentation will be part of the “Advanced Microscopy” session, to be held at 2:30 p.m. on Monday, 17 September in the Jefferson West ballroom of the Washington Hilton hotel.Their new technique relies on optical fiber technology to provide new sensors for photoacoustic imaging. It uses fiber-optic ultrasound detection, exploiting the acoustic effects on laser pulses via the thermoelastic effect — temperature changes that occur as a result of the elastic strain.”Conventional fiber optic sensors detect extremely weak signals by taking advantage of their high sensitivity via phase measurement,” said Jin. These same sorts of sensors are used in military applications to detect low-frequency (kilohertz) acoustic waves. But it turns out that they don’t work so well for ultrasound waves at the megahertz frequencies used for medical purposes because ultrasound waves typically propagate as spherical waves and have a very limited interaction length with optical fibers. The new sensors were specifically developed for medical imaging, Jin said, and can provide better sensitivity than the piezoelectric transducers in use today.The group designed a special ultrasound sensor that’s essentially a compact laser built within the 8-micron-diameter core of a single-mode optical fiber. “It has a typical length of only 8 millimeters,” Jin said. “To build up the laser, two highly reflective grating mirrors are UV-written into the fiber core to provide optical feedback.”This fiber then gets doped with ytterbium and erbium to provide sufficient optical gain at 1,530 nanometers. They use a 980-nanometer semiconductor laser as the pump laser.Related StoriesNANOLIVE‘s novel CX-A defines a new standard for live cell imaging in 96 well plates for continuous organelle monitoring in cell populationsCutting-edge electron microscopy reveals first structures of a lipid-flippaseMathematical model helps quantify metastatic cell behavior”Such fiber lasers with a kilohertz-order linewidth — the width of the optical spectrum — can be exploited as sensors because they offer a high signal-to-noise ratio,” said research team member Yizhi Liang, an assistant professor at the Institute of Photonics Technology.The ultrasound detection benefits from the combined technique because side-incident ultrasound waves deform the fiber, modulating the lasing frequency.”By detecting the frequency shift, we can reconstruct the acoustic waveform,” Liang said.The team does not demodulate the ultrasound signal, extracting the original information, using conventional interferometry-based methods or any additive frequency locking. Rather, they use another method, called “self-heterodyning,” where the result of mixing two frequencies is detected. Here, they measure the radio frequency-domain beat note given by two orthogonal polarization modes of the fiber cavity. This demodulation also intrinsically guarantees a stable signal output.The fiber laser-based ultrasound sensors offer opportunities for use in photoacoustic microscopy. The researchers used a focused 532-nanometer nanosecond pulse laser to illuminate a sample and excite ultrasound signals. They place a sensor in a stationary position near the biological sample to detect optically induced ultrasound waves.”By raster scanning the laser spot, we can obtain a photoacoustic image of the vessels and capillaries of a mouse’s ear,” Jin said. “This method can also be used to structurally image other tissues and functionally image oxygen distribution by using other excitation wavelengths — which takes advantage of the characteristic absorption spectra of different target tissues.”Optical fibers are useful because they are tiny, lightweight, and intrinsically flexible, Jin added.”The development of our laser sensor is very encouraging because of its potential for endoscopes and wearable applications,” Jin said. “But current commercial endoscopic products are typically millimeters in dimension, which can cause pain, and they don’t work well within hollow organs with limited space.”