An acute case of expressive aphasia following ischaemic stroke

Mr. D.C. is a 75-year old gentleman brought to casualty after a neighbour found him unable to speak. Since he was severely aphasic, he was unable to give a proper history. The patient was able to understand commands, making this a pure expressive aphasia. He was also noted to have right hemiparesis and right facial weakness. On examination, Mr D.C. was found to have 0/5 power on the right half of his body and 3/5 power on the left side of his body using the MRC muscle power assessment scale. He was noted to have right facial weakness in an upper motor neurone lesion pattern. He was urgently admitted to a medical ward and a CT scan was requested. The scan confirmed a left middle cerebral artery (MCA) ischaemic infarct affecting the basal ganglia and Broca’s Area in the inferior frontal lobe.peer-reviewe

Measurement of the cross section and longitudinal double-spin asymmetry for dijet production in polarized pp collisions at √ s = 200 GeV

We report the first measurement of the longitudinal double-spin asymmetry ALL for midrapidity dijet production in polarized pp collisions at a center-of-mass energy of √s=200 GeV. The dijet cross section was measured and is shown to be consistent with next-to-leading order (NLO) perturbative QCD predictions. ALL results are presented for two distinct topologies, defined by the jet pseudorapidities, and are compared to predictions from several recent NLO global analyses. The measured asymmetries, the first such correlation measurements, support those analyses that find positive gluon polarization at the level of roughly 0.2 over the region of Bjorken-x\u3e0.05

QoE-Based Low-Delay Live Streaming Using Throughput Predictions

Recently, HTTP-based adaptive streaming has become the de facto standard for video streaming over the Internet. It allows clients to dynamically adapt media characteristics to network conditions in order to ensure a high quality of experience, that is, minimize playback interruptions, while maximizing video quality at a reasonable level of quality changes. In the case of live streaming, this task becomes particularly challenging due to the latency constraints. The challenge further increases if a client uses a wireless network, where the throughput is subject to considerable fluctuations. Consequently, live streams often exhibit latencies of up to 30 seconds. In the present work, we introduce an adaptation algorithm for HTTP-based live streaming called LOLYPOP (Low-Latency Prediction-Based Adaptation) that is designed to operate with a transport latency of few seconds. To reach this goal, LOLYPOP leverages TCP throughput predictions on multiple time scales, from 1 to 10 seconds, along with an estimate of the prediction error distribution. In addition to satisfying the latency constraint, the algorithm heuristically maximizes the quality of experience by maximizing the average video quality as a function of the number of skipped segments and quality transitions. In order to select an efficient prediction method, we studied the performance of several time series prediction methods in IEEE 802.11 wireless access networks. We evaluated LOLYPOP under a large set of experimental conditions limiting the transport latency to 3 seconds, against a state-of-the-art adaptation algorithm from the literature, called FESTIVE. We observed that the average video quality is by up to a factor of 3 higher than with FESTIVE. We also observed that LOLYPOP is able to reach a broader region in the quality of experience space, and thus it is better adjustable to the user profile or service provider requirements.Comment: Technical Report TKN-16-001, Telecommunication Networks Group, Technische Universitaet Berlin. This TR updated TR TKN-15-00

Measurement of D0 Azimuthal Anisotropy at Midrapidity in Au + Au Collisions at √ s N N = 200 GeV

We report the first measurement of the elliptic anisotropy (v2) of the charm meson D0 at midrapidity (|y

Glass reinforcement of recycled polycarbonate

The main barrier to recycling of post-consumer plastics is the commingled nature of these materials with consequent poor and variable mechanical, thermal and flow properties; separating the polymers by chemical type is prohibitively expensive and does not completely solve the problem of batch-to-batch variability in properties that results from variations in the nature and amount of impurities and variation in polymer molecular weight and molecular weight distribution. In the present work, it is proposed that the addition of up to 20 wt% short glass fibers to the mixed plastic makes the mechanical and flow properties of the composite depend more on the glass reinforcement than on the polymeric matrix. The truth of this hypothesis is demonstrated by providing data on polymers obtained from end-of-life electronics, typically polycarbonate (PC) and acrylonitrile-butadiene-styrene (ABS). It is shown that impact strength and elongation-to-break in a tensile test are the two mechanical properties that are most sensitive to the presence of impurities in PC. On adding short glass fibers, these two properties become almost insensitive to changes in matrix composition provided that the matrix contains at least 75% virgin PC. Thus, a sample containing 15 wt% glass fibers has an impact strength of 1.4 ft-lb/in when the matrix contains recycled PC, and this impact strength goes up to only 1.8 ft-lb/in when the matrix is entirely virgin PC; the increase in strain-at-fracture is from 5% to 6.7%. Similarly, the viscosity difference between PC melts with added glass fibers is acceptably small if the matrix contains at least 75% virgin PC. This says that, for purposes of recycling, separation of commingled plastics is not necessary, and one can formulate a green product having 25% recycled polymer (based on resin content) by the addition of an appropriate amount of short glass fibers