"No, You Can't": la comunicazione politica americana nella transizione da Obama a Trump

Si tratta di un lavoro che individua analogie, forse impreviste, tra la propaganda del secondo Obama e del (primo?) Trump

Positioning by multicell fingerprinting in urban NB-IoT networks

Narrowband Internet of Things (NB-IoT) has quickly become a leading technology in the deployment of IoT systems and services, owing to its appealing features in terms of coverage and energy efficiency, as well as compatibility with existing mobile networks. Increasingly, IoT services and applications require location information to be paired with data collected by devices; NB-IoT still lacks, however, reliable positioning methods. Time-based techniques inherited from long-term evolution (LTE) are not yet widely available in existing networks and are expected to perform poorly on NB-IoT signals due to their narrow bandwidth. This investigation proposes a set of strategies for NB-IoT positioning based on fingerprinting that use coverage and radio information from multiple cells. The proposed strategies were evaluated on two large-scale datasets made available under an open-source license that include experimental data from multiple NB-IoT operators in two large cities: Oslo, Norway, and Rome, Italy. Results showed that the proposed strategies, using a combination of coverage and radio information from multiple cells, outperform current state-of-the-art approaches based on single cell fingerprinting, with a minimum average positioning error of about 20 m when using data for a single operator that was consistent across the two datasets vs. about 70 m for the current state-of-the-art approaches. The combination of data from multiple operators and data smoothing further improved positioning accuracy, leading to a minimum average positioning error below 15 m in both urban environments

Exigências nutricionais de mudas de bananeira tipo prata submetidas à deficiência de nutrientes.

O objetivo deste trabalho foi avaliar a produção de matéria seca de mudas de banana tipo prata submetidas a omissão de macronutrientes em solução nutritiva. Um experimento foi conduzido em casa de vegetação no Campus JK da UFVJM, no delineamento experimental inteiramente casualizado, com três repetições com uma planta por vaso em solução nutritiva. Os tratamentos foram: Completo (macro e micronutrientes) e a omissão de um nutriente por vez (-N, -P, -K, -Ca, -Mg , -S, -B, -Cu, -Fe, -Mn e -Zn) em solução nutritiva e dois genótipos (Prata-Ana e seu híbrido PA42-44). A adubação no tratamento completo consistiu de: 210,1 mg de N, 31 mg de P, 234,6 mg de K, 200,4 mg de Ca, 48,6 mg de Mg, 64,2 mg de S, 500 ?g de B, 20 ?g de Cu, 648 ?g de Cl, 5.022 ?g de Fe, 502 ?g de Mn, 11 ?g de Mo e 50 ?g de Zn por litro. O período experimental foi de 100 dias e foram avaliadas as seguintes características: área foliar, peso de massa seca da parte aérea e de raízes. O genótipo Prata-Anã é mais exigente em N e Ca e é menos exigente em K e Mg e micronutrientes do que o genótipo PA42-44, tendo a mesma exigência em P, S e B

Cooperative spectrum sensing based on Majority decision under CFAR and CDR constraints

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Indoor location for safety application using wireless networks

This paper presents the indoor positioning research activities carried out within the scope of the Liaison project. Most of the work has been performed on WiFi location. WiFi is nowadays widely deployed in buildings such as hotels, hospitals, airports, train stations, public buildings, etc. Using this infrastructure to locate terminals connected to the wireless LAN is expected to have a low cost. Methods presented in this paper include fingerprinting with particle filter constrained on a Voronoi diagram and TOA based on data frames and acknowledgments at the IEEE 802.11 MAC level. Other technologies have also been researched: A-GNSS to handle the transition between outdoors and indoors, UWB in ad-hoc mode to cope with possible lacks of infrastructure and inertial MEMS to increase the availability and robustness of the overall system

Transport in out-of-equilibrium XXZ chains: Nonballistic behavior and correlation functions

We consider the nonequilibrium protocol where two semi-infinite gapped XXZ chains, initially prepared in different equilibrium states, are suddenly joint together. At large times, a generalized hydrodynamic description applies, according to which the system can locally be represented by space- and time- dependent stationary states. The magnetization displays an unusual behavior: depending on the initial state, its profile may exhibit abrupt jumps that can not be predicted directly from the standard hydrodynamic equations and which signal non-ballistic spin transport. We ascribe this phenomenon to the structure of the local conservation laws and make a prediction for the exact location of the jumps. We find that the jumps propagate at the velocities of the heaviest quasiparticles. By means of tDMRG simulations we show that our theory yields a complete description of the long-time steady profiles of conserved charges, currents, and local correlations

Excitons and charged excitons in semiconductor quantum wells

A variational calculation of the ground-state energy of neutral excitons and of positively and negatively charged excitons (trions) confined in a single-quantum well is presented. We study the dependence of the correlation energy and of the binding energy on the well width and on the hole mass. The conditional probability distribution for positively and negatively charged excitons is obtained, providing information on the correlation and the charge distribution in the system. A comparison is made with available experimental data on trion binding energies in GaAs-, ZnSe-, and CdTe-based quantum well structures, which indicates that trions become localized with decreasing quantum well width.Comment: 9 pages, 11 figure