We present a nonlinear event-driven model of a Digital PLL used in the context of a polar modulation. This modeling has shown that the estimation method of the TDC gain has a big impact on the EVM for wideband modulat...We present a nonlinear event-driven model of a Digital PLL used in the context of a polar modulation. This modeling has shown that the estimation method of the TDC gain has a big impact on the EVM for wideband modulation and a solution has been proposed which consists to add the modulation on the gain after calibration of the gain offset. This transforms the classical two-points modulator into a three-points modulator. This implementation has been validated for WCDMA standard.展开更多
In this article, we describe the recent developments in higher education relative to the digital outcomes. Between these evolutions, we are witnessing new teaching locations or sites called ＂learning labs＂. The aim ...In this article, we describe the recent developments in higher education relative to the digital outcomes. Between these evolutions, we are witnessing new teaching locations or sites called ＂learning labs＂. The aim of this article is to present how the deployment of such a location （sometimes named third places） can offer some new perspectives, modifies the way of teaching and gives some interesting results both from the teachers＇ point of view （in terms of assessment of knowledge and know-how） and for the learners （in terms of motivation, immersion and exchanges）. In a second phase, we will focus on the predominant role that electronics can take in setting up formations, especially around ＂connected objects＂ （i.e. communicating devices connected to networks）. We will illustrate concretely our idea around an experimental training which has obtained the national label GEN （＂Grande Ecole du Numkrique＂）.展开更多
Piezoelectric nanowires have attracted much scientific interest in the last few years because of their enhanced piezoelectric coefficients at nanometer scale, with promises of efficient mechanical energy harvesters fo...Piezoelectric nanowires have attracted much scientific interest in the last few years because of their enhanced piezoelectric coefficients at nanometer scale, with promises of efficient mechanical energy harvesters for autonomous integrated systems. This paper presents the design and, for the first time, guideline rules, based on simple analytical expressions, to improve the performance of a mechanical energy harvester integrating vertical ZnO piezoelectric nanowires. Additional simulations were carried out to account more realistically for device geometry. The authors discuss the prospects of such an approach, based on design and material improvement.展开更多
We present the results of research carried out for the first time, to the best of our knowledge, on the generation of terahertz radiation under the action of "single-color" and "dual-color" high-po...We present the results of research carried out for the first time, to the best of our knowledge, on the generation of terahertz radiation under the action of "single-color" and "dual-color" high-power femtosecond laser pulses on liquefied gas–liquid nitrogen. Our experimental results supported by careful theoretical interpretation showed clearly that under femtosecond laser radiation, liquid and air emit terahertz waves in a very different way. We assumed that the mobility of ions and electrons in liquid can play an essential role, forming a quasi-static electric field by means of ambipolar diffusion mechanism.展开更多
文摘We present a nonlinear event-driven model of a Digital PLL used in the context of a polar modulation. This modeling has shown that the estimation method of the TDC gain has a big impact on the EVM for wideband modulation and a solution has been proposed which consists to add the modulation on the gain after calibration of the gain offset. This transforms the classical two-points modulator into a three-points modulator. This implementation has been validated for WCDMA standard.
文摘In this article, we describe the recent developments in higher education relative to the digital outcomes. Between these evolutions, we are witnessing new teaching locations or sites called ＂learning labs＂. The aim of this article is to present how the deployment of such a location （sometimes named third places） can offer some new perspectives, modifies the way of teaching and gives some interesting results both from the teachers＇ point of view （in terms of assessment of knowledge and know-how） and for the learners （in terms of motivation, immersion and exchanges）. In a second phase, we will focus on the predominant role that electronics can take in setting up formations, especially around ＂connected objects＂ （i.e. communicating devices connected to networks）. We will illustrate concretely our idea around an experimental training which has obtained the national label GEN （＂Grande Ecole du Numkrique＂）.
文摘Piezoelectric nanowires have attracted much scientific interest in the last few years because of their enhanced piezoelectric coefficients at nanometer scale, with promises of efficient mechanical energy harvesters for autonomous integrated systems. This paper presents the design and, for the first time, guideline rules, based on simple analytical expressions, to improve the performance of a mechanical energy harvester integrating vertical ZnO piezoelectric nanowires. Additional simulations were carried out to account more realistically for device geometry. The authors discuss the prospects of such an approach, based on design and material improvement.
基金Russian Foundation for Basic Research(RFBR)(17-02-01217,18-29-20104,18-52-16016)Major National Development Project of Scientific Instrument and Equipment,China(2016YFF0100503)+2 种基金National Natural Science Foundation of China(NSFC)(61722111)111 Project,China(D18014)International Joint Lab Program supported by Science and Technology Commission of Shanghai Municipality(STCSM)(17590750300)
文摘We present the results of research carried out for the first time, to the best of our knowledge, on the generation of terahertz radiation under the action of "single-color" and "dual-color" high-power femtosecond laser pulses on liquefied gas–liquid nitrogen. Our experimental results supported by careful theoretical interpretation showed clearly that under femtosecond laser radiation, liquid and air emit terahertz waves in a very different way. We assumed that the mobility of ions and electrons in liquid can play an essential role, forming a quasi-static electric field by means of ambipolar diffusion mechanism.
