Performance evaluation of bluetooth low energy for high data rate body area networks

Bluetooth Low Energy (BLE) is a promising wireless network technology, in the context of body area network (BAN) applications, to provide the required quality of service (QoS) support concerning the communication between sensor nodes placed on a user’s body and a personal device, such as a smartphone. Most previous BLE performance studies in the literature have focused primarily in networks with a single slave (point-to-point link) or traffic scenarios with relatively low data rate. However, many BAN sensors generate high data rate traffic, and several sensor nodes (slaves) may be actively sending data in the same BAN. Therefore, this work focuses on the evaluation of the suitability of BLE mainly under these conditions. Results show that, for the same traffic, the BLE protocol presents lower energy consumption and supports more sensor nodes than an alternative IEEE 802.15.4-based protocol. This study also identifies and characterizes some implementation constraints on the tested platforms that impose limits on the achievable performance.This work has been supported by FCT (Fundação para a Ciência e Tecnologia) in the scope of the projects UID/EEA/04436/2013 and UID/CTM/50025/2013, and by FEDER funds through the COMPETE 2020 Programme

Review of AdS/CFT Integrability, Chapter II.2: Quantum Strings in AdS5xS5

We review the semiclassical analysis of strings in AdS5xS5 with a focus on the relationship to the underlying integrable structures. We discuss the perturbative calculation of energies for strings with large charges, using the folded string spinning in an AdS3 subset of AdS5 as our main example. Furthermore, we review the perturbative light-cone quantization of the string theory and the calculation of the worldsheet S-matrix.Comment: 20 pages, see also overview article arXiv:1012.3982, v2: references to other chapters update

Multiplicity dependence of jet-like two-particle correlations in p-Pb collisions at sNN\sqrt{s_{NN}} = 5.02 TeV

Two-particle angular correlations between unidentified charged trigger and associated particles are measured by the ALICE detector in p-Pb collisions at a nucleon-nucleon centre-of-mass energy of 5.02 TeV. The transverse-momentum range 0.7 $< p_{\rm{T}, assoc} < p_{\rm{T}, trig} <$ 5.0 GeV/$c$ is examined, to include correlations induced by jets originating from low momen\-tum-transfer scatterings (minijets). The correlations expressed as associated yield per trigger particle are obtained in the pseudorapidity range $|\eta|<0.9$. The near-side long-range pseudorapidity correlations observed in high-multiplicity p-Pb collisions are subtracted from both near-side short-range and away-side correlations in order to remove the non-jet-like components. The yields in the jet-like peaks are found to be invariant with event multiplicity with the exception of events with low multiplicity. This invariance is consistent with the particles being produced via the incoherent fragmentation of multiple parton--parton scatterings, while the yield related to the previously observed ridge structures is not jet-related. The number of uncorrelated sources of particle production is found to increase linearly with multiplicity, suggesting no saturation of the number of multi-parton interactions even in the highest multiplicity p-Pb collisions. Further, the number scales in the intermediate multiplicity region with the number of binary nucleon-nucleon collisions estimated with a Glauber Monte-Carlo simulation.Comment: 23 pages, 6 captioned figures, 1 table, authors from page 17, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/161

Multi-particle azimuthal correlations in p-Pb and Pb-Pb collisions at the CERN Large Hadron Collider

Measurements of multi-particle azimuthal correlations (cumulants) for charged particles in p-Pb and Pb-Pb collisions are presented. They help address the question of whether there is evidence for global, flow-like, azimuthal correlations in the p-Pb system. Comparisons are made to measurements from the larger Pb-Pb system, where such evidence is established. In particular, the second harmonic two-particle cumulants are found to decrease with multiplicity, characteristic of a dominance of few-particle correlations in p-Pb collisions. However, when a $|\Delta \eta|$ gap is placed to suppress such correlations, the two-particle cumulants begin to rise at high-multiplicity, indicating the presence of global azimuthal correlations. The Pb-Pb values are higher than the p-Pb values at similar multiplicities. In both systems, the second harmonic four-particle cumulants exhibit a transition from positive to negative values when the multiplicity increases. The negative values allow for a measurement of $v_{2}\{4\}$ to be made, which is found to be higher in Pb-Pb collisions at similar multiplicities. The second harmonic six-particle cumulants are also found to be higher in Pb-Pb collisions. In Pb-Pb collisions, we generally find $v_{2}\{4\} \simeq v_{2}\{6\}\neq 0$ which is indicative of a Bessel-Gaussian function for the $v_{2}$ distribution. For very high-multiplicity Pb-Pb collisions, we observe that the four- and six-particle cumulants become consistent with 0. Finally, third harmonic two-particle cumulants in p-Pb and Pb-Pb are measured. These are found to be similar for overlapping multiplicities, when a $|\Delta\eta| > 1.4$ gap is placed.Comment: 25 pages, 11 captioned figures, 3 tables, authors from page 20, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/87

Challenges in QCD matter physics - The Compressed Baryonic Matter experiment at FAIR

Substantial experimental and theoretical efforts worldwide are devoted to explore the phase diagram of strongly interacting matter. At LHC and top RHIC energies, QCD matter is studied at very high temperatures and nearly vanishing net-baryon densities. There is evidence that a Quark-Gluon-Plasma (QGP) was created at experiments at RHIC and LHC. The transition from the QGP back to the hadron gas is found to be a smooth cross over. For larger net-baryon densities and lower temperatures, it is expected that the QCD phase diagram exhibits a rich structure, such as a first-order phase transition between hadronic and partonic matter which terminates in a critical point, or exotic phases like quarkyonic matter. The discovery of these landmarks would be a breakthrough in our understanding of the strong interaction and is therefore in the focus of various high-energy heavy-ion research programs. The Compressed Baryonic Matter (CBM) experiment at FAIR will play a unique role in the exploration of the QCD phase diagram in the region of high net-baryon densities, because it is designed to run at unprecedented interaction rates. High-rate operation is the key prerequisite for high-precision measurements of multi-differential observables and of rare diagnostic probes which are sensitive to the dense phase of the nuclear fireball. The goal of the CBM experiment at SIS100 (sqrt(s_NN) = 2.7 - 4.9 GeV) is to discover fundamental properties of QCD matter: the phase structure at large baryon-chemical potentials (mu_B > 500 MeV), effects of chiral symmetry, and the equation-of-state at high density as it is expected to occur in the core of neutron stars. In this article, we review the motivation for and the physics programme of CBM, including activities before the start of data taking in 2022, in the context of the worldwide efforts to explore high-density QCD matter.Comment: 15 pages, 11 figures. Published in European Physical Journal

Generalized cusp in AdS_4 x CP^3 and more one-loop results from semiclassical strings

We evaluate the exact one-loop partition function for fundamental strings whose world-surface ends on a cusp at the boundary of AdS_4 and has a "jump" in CP^3. This allows us to extract the stringy prediction for the ABJM generalized cusp anomalous dimension Gamma_{cusp}^{ABJM} (phi,theta) up to NLO in sigma-model perturbation theory. With a similar analysis, we present the exact partition functions for folded closed string solutions moving in the AdS_3 parts of AdS_4 x CP^3 and AdS_3 x S^3 x S^3 x S^1 backgrounds. Results are obtained applying to the string solutions relevant for the AdS_4/CFT_3 and AdS_3/CFT_2 correspondence the tools previously developed for their AdS_5 x S^5 counterparts.Comment: 48 pages, 2 figures, version 3, corrected misprints in formulas 2.12, B.86, C.33, added comment on verification of the light-like limi

A facility to Search for Hidden Particles (SHiP) at the CERN SPS

A new general purpose fixed target facility is proposed at the CERN SPS accelerator which is aimed at exploring the domain of hidden particles and make measurements with tau neutrinos. Hidden particles are predicted by a large number of models beyond the Standard Model. The high intensity of the SPS 400~GeV beam allows probing a wide variety of models containing light long-lived exotic particles with masses below ${\cal O}$(10)~GeV/c$^2$, including very weakly interacting low-energy SUSY states. The experimental programme of the proposed facility is capable of being extended in the future, e.g. to include direct searches for Dark Matter and Lepton Flavour Violation.Comment: Technical Proposa

Рентгенодиагностика хронических заворотов желудка: серия случаев

INTRODUCTION: Volvulus of the stomach is a rare disease that can lead to serious consequences, including death of the patients. Among all volvulus of various parts of the gastrointestinal tract, volvulus of the stomach corresponds to 0.5% of cases.Chronic volvulus, while being detected timely, can be successfully treated conservatively or surgically without leading to life threatening conditions. So the diagnosis of chronic gastric volvulus is an important and topical problem.OBJECTIVE: The aim of the study was the analysis of radiological data of patients with gastric volvulus.MATERIALS AND METHODS: Results of chest, esophagus and stomach X-ray examination of 23 patients with gastric volvulus were analyzed.RESULTS: The results of X-ray examination of 23 patients with gastric volvulus are described. In 9 cases organo-axial volvulus of the stomach was detected, in 12 — mesenteric-axial volvulus, 2 patients had a combined type of inversion. In 3 cases chronic volvulus was combined with total hiatal hernia, in 6 — with gastric tumors, in 9 cases — with perigastritis, in 5 patients volvulus was observed after abdominal surgery.DISCUSSION: In our observations, most patients were diagnosed with chronic volvulus of the stomach along the transverse axis, and longitudinal was less common. We also observed a rare combined gastric volvulus. The development of volvulus in our observations was provoked by perigastritis, gastric tumors, surgical interventions and total hiatal herniaal signs.Complaints of patients and the clinical signs were non-specific, in some cases the disease was asymptomatic. X-ray examination of the esophagus and stomach showed high efficiency in the diagnosis of various types of gastric volvulus.CONCLUSION: X-ray allows to reliably diagnose various types of gastric volvulus. ВВЕДЕНИЕ: Заворот желудка — редкое заболевание, которое может привести к тяжелым последствиям вплоть до летального исхода. Среди всех заворотов различных отделов желудочно-кишечного тракта заворот желудка составляет 0,5%. Вовремя выявленный хронический заворот успешно корригируется консервативным или оперативным путем без угрозы для жизни пациента, поэтому диагностика хронических заворотов желудка является важной и актуальной проблемой.ЦЕЛЬ: Провести анализ возможностей классических рентгеноскопии и рентгенографии в выявлении хронических заворотов желудка.МАТЕРИАЛЫ И МЕТОДЫ: Рентгенологическая картина легких и средостения, пищевода и желудка 23 пациентов с хроническими заворотами желудка.РЕЗУЛЬТАТЫ: Получена рентгенологическая картина состояния желудка 23 пациентов с хроническими заворотами желудка. У 9 пациентов был диагностирован заворот желудка по продольной оси, у 12 пациентов — по поперечной оси, у 2 — комбинированный тип заворота. У 5 пациентов заворот наблюдался после оперативных вмешательств. В 9 случаях заворот сочетался с перигастритом, в 6 — с опухолями желудка, в 3 случаях — с тотальной хиатальной грыжей.ОБСУЖДЕНИЕ: В наших наблюдениях у большинства пациентов диагностирован хронический заворот желудка по поперечной оси, реже встречался заворот по продольной оси. Кроме того, мы наблюдали редкий комбинированный заворот желудка. Развитие заворота в наших наблюдениях провоцировали перигастрит, опухоли желудка, оперативные вмешательства и тотальные грыжи пищеводного отверстия диафрагмы. Жалобы пациентов и клиническая картина носили неспецифический характер, в ряде случаев заболевание протекало бессимптомно. Рентгенологическое исследование пищевода и желудка показало высокую эффективность в диагностике различных видов заворотов желудка.ЗАКЛЮЧЕНИЕ: Рентгеноскопия и рентгенография позволяют диагностировать различные виды хронического заворота желудка