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https://www.readbyqxmd.com/read/27916825/optimal-resource-allocation-policies-for-multi-user-backscatter-communication-systems
#1
Bin Lyu, Zhen Yang, Guan Gui, Youhong Feng
This paper considers a backscatter communication (BackCom) system including a reader and N tags, where each tag receives excitation signals transmitted by the reader and concurrently backscatters information to the reader in time-division-multiple-access (TDMA) mode. In this system, we aim to maximize the total system goodput by jointly optimizing reader transmission power, time allocation, and reflection ratio for the cases of passive and semi-passive tags. For each case, an optimization problem is formulated, which is non-convex and can be solved by being decomposed into at most N feasible sub-problems based on the priority of allocated reader transmission power...
November 29, 2016: Sensors
https://www.readbyqxmd.com/read/27865432/a-hybrid-fault-diagnosis-approach-based-on-mixed-domain-state-features-for-rotating-machinery
#2
Xiaoming Xue, Jianzhong Zhou
To make further improvement in the diagnosis accuracy and efficiency, a mixed-domain state features data based hybrid fault diagnosis approach, which systematically blends both the statistical analysis approach and the artificial intelligence technology, is proposed in this work for rolling element bearings. For simplifying the fault diagnosis problems, the execution of the proposed method is divided into three steps, i.e., fault preliminary detection, fault type recognition and fault degree identification...
November 16, 2016: ISA Transactions
https://www.readbyqxmd.com/read/27733821/building-an-eeg-fmri-multi-modal-brain-graph-a-concurrent-eeg-fmri-study
#3
Qingbao Yu, Lei Wu, David A Bridwell, Erik B Erhardt, Yuhui Du, Hao He, Jiayu Chen, Peng Liu, Jing Sui, Godfrey Pearlson, Vince D Calhoun
The topological architecture of brain connectivity has been well-characterized by graph theory based analysis. However, previous studies have primarily built brain graphs based on a single modality of brain imaging data. Here we develop a framework to construct multi-modal brain graphs using concurrent EEG-fMRI data which are simultaneously collected during eyes open (EO) and eyes closed (EC) resting states. FMRI data are decomposed into independent components with associated time courses by group independent component analysis (ICA)...
2016: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/27719894/effects-of-ultrasound-pre-treatment-on-the-structure-of-%C3%AE-conglycinin-and-glycinin-and-the-antioxidant-activity-of-their-hydrolysates
#4
Yuting Wang, Zhongjiang Wang, Cíntia Ladeira Handa, Jing Xu
The effect of power, time and temperature of ultrasound on the structure of β-conglycinin (7S) and glycinin (11S), and on the antioxidant activity of their hydrolysates were investigated. All ultrasound treated 7S and 11S fractions showed an increase in the α-helix and β-turn proportions, and a decrease in β-sheet and random coil proportions. The polarity of 7S and 11S microenvironment increased after ultrasound treatment. Ultrasound treatment significantly increased the reduction capacity and iron chelating capacity of 7S and 11S hydrolysates...
March 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27692590/regional-and-network-relationship-in-the-intracranial-eeg-second-spectrum
#5
Rasesh B Joshi, Nicolas Gaspard, Irina I Goncharova, Robert B Duckrow, Dominique Duncan, Jason L Gerrard, Dennis D Spencer, Lawrence J Hirsch, Hitten P Zaveri
OBJECTIVE: We examined low-frequency amplitude modulations of band power time-series, i.e. the second spectrum, of the intracranial EEG (icEEG) for evidence of support for spatial relationships between different parts of the brain and within the default mode network (DMN). METHODS: We estimated magnitude-squared coherence (MSC) of the running power in the delta, theta, alpha, beta, and gamma frequency bands for one-hour background icEEG epochs recorded from 9 patients...
September 10, 2016: Clinical Neurophysiology: Official Journal of the International Federation of Clinical Neurophysiology
https://www.readbyqxmd.com/read/27691454/force-and-power-time-curve-comparison-during-jumping-between-strength-matched-male-and-female-basketball-players
#6
Paige E Rice, Courtney L Goodman, Christopher R Capps, N Travis Triplett, Travis M Erickson, Jeffrey M McBride
The purpose of this study was to compare force- and power-time curve variables during jumping between Division I strength-matched male and female basketball athletes. Males (n = 8) and females (n = 8) were strength matched by testing a one-repetition maximum (1RM) back squat. 1RM back squat values were normalised to body mass in order to demonstrate that strength differences were a function of body mass alone. Subjects performed three countermovement jumps (CMJ) at maximal effort. Absolute and relative force- and power-time curve variables from the CMJs were analysed between males and females...
October 1, 2016: European Journal of Sport Science
https://www.readbyqxmd.com/read/27661356/harmonics-analysis-of-the-photonic-time-stretch-system
#7
Yuan Mei, Boyu Xu, Hao Chi, Tao Jin, Shilie Zheng, Xiaofeng Jin, Xianmin Zhang
Photonic time stretch (PTS) has been intensively investigated in recent decades due to its potential application to ultra-wideband analog-to-digital conversion. A high-speed analog signal can be captured by an electronic analog-to-digital converter (ADC) with the help of the PTS technique, which slows down the speed of signal in the photonic domain. Unfortunately, the process of the time stretch is not linear due to the nonlinear modulation of the electro-optic intensity modulator in the PTS system, which means the undesired harmonics distortion...
September 10, 2016: Applied Optics
https://www.readbyqxmd.com/read/27566426/defining-new-metrics-in-microwave-ablation-of-pulmonary-tumors-ablation-work-and-ablation-resistance-score
#8
Ramsey A Al-Hakim, Fereidoun G Abtin, Scott J Genshaft, Erin Kutay, Robert D Suh
PURPOSE: To investigate pulmonary microwave ablation metrics including ablation work, ablation resistance score, and involution. MATERIALS AND METHODS: Retrospective review was performed of 98 pulmonary tumor ablations using the NeuWave Certus Microwave Ablation System (NeuWave Medical, Madison, Wisconsin) in 71 patients (32 men and 39 women; mean age, 64.7 y ± 11.5). Ablation work was defined as sum of (power) * (time) * (number of antennas) for all phases during an ablation procedure...
September 2016: Journal of Vascular and Interventional Radiology: JVIR
https://www.readbyqxmd.com/read/27527337/zno-au-sno2-z-scheme-photoanodes-for-remarkable-photoelectrochemical-water-splitting
#9
Jing-Mei Li, Hao-Yun Cheng, Yi-Hsuan Chiu, Yung-Jung Hsu
For the first time a ZnO nanorod-based Z-scheme heterostructure system was proposed and realized for efficient photoelectrochemical water splitting. The samples were prepared by depositing a thin layer of SnO2 on the Au surface of Au particle-decorated ZnO nanorods. For ZnO-Au-SnO2 nanorods, the embedded Au can mediate interfacial charge transfer by promoting electron transfer from the conduction band of SnO2 to the valence band of ZnO. This vectorial charge transfer resulted in the situation that the photoexcited electrons accumulated at ZnO while the photogenerated holes concentrated at SnO2, giving ZnO-Au-SnO2 substantially high redox powers...
August 25, 2016: Nanoscale
https://www.readbyqxmd.com/read/27409939/snr-of-swept-sleds-and-swept-lasers-for-oct
#10
Bart Johnson, Walid Atia, Dale C Flanders, Mark Kuznetsov, Brian D Goldberg, Nate Kemp, Peter Whitney
A back-to-back comparison of a tunable narrow-band-filtered SLED (TSLED) and a swept laser are made for OCT applications. The two sources are similar in terms of sweep speed, tuning range and coherence length. A fundamental issue with a TSLED is that the RIN is proportional to 1/linewidth, meaning that the longer the coherence length, the higher the RIN and clock jitter. We show that the TSLED has an SNR limit that causes noise streaks at points of high reflection in images. The laser, which is shot noise limited, does not exhibit this effect...
May 16, 2016: Optics Express
https://www.readbyqxmd.com/read/27406253/formality-of-the-chinese-collective-leadership
#11
Haiying Li, Arthur C Graesser
We investigated the linguistic patterns in the discourse of four generations of the collective leadership of the Communist Party of China (CPC) from 1921 to 2012. The texts of Mao Zedong, Deng Xiaoping, Jiang Zemin, and Hu Jintao were analyzed using computational linguistic techniques (a Chinese formality score) to explore the persuasive linguistic features of the leaders in the contexts of power phase, the nation's education level, power duration, and age. The study was guided by the elaboration likelihood model of persuasion, which includes a central route (represented by formal discourse) versus a peripheral route (represented by informal discourse) to persuasion...
September 2016: Behavior Research Methods
https://www.readbyqxmd.com/read/27378836/computational-pipeline-for-nirs-eeg-joint-imaging-of-tdcs-evoked-cerebral-responses-an-application-in-ischemic-stroke
#12
Debarpan Guhathakurta, Anirban Dutta
Transcranial direct current stimulation (tDCS) modulates cortical neural activity and hemodynamics. Electrophysiological methods (electroencephalography-EEG) measure neural activity while optical methods (near-infrared spectroscopy-NIRS) measure hemodynamics coupled through neurovascular coupling (NVC). Assessment of NVC requires development of NIRS-EEG joint-imaging sensor montages that are sensitive to the tDCS affected brain areas. In this methods paper, we present a software pipeline incorporating freely available software tools that can be used to target vascular territories with tDCS and develop a NIRS-EEG probe for joint imaging of tDCS-evoked responses...
2016: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/27347664/influence-of-isoinertial-pneumatic-mixed-resistances-on-force-velocity-relationship
#13
Simon Avrillon, Boris Jidovtseff, François Hug, Gaël Guilhem
PURPOSE: Muscle strengthening is commonly based on the use of isoinertial loading, whereas variable resistances such as pneumatic loading may be implemented to optimize training stimulus. The purpose of the present study was to determine the effect of the ratio between pneumatic and isoinertial resistance on the force-velocity relationship during ballistic movements. METHODS: A total of 15 participants performed two concentric repetitions of ballistic bench press movements with intention to throw the bar at 30%, 45%, 60%, 75%, and 90% of the maximal concentric repetition, with five resistance ratios including 100%, 75%, 50%, 25% or 0% of pneumatic resistance, the additional load being isoinertial...
June 27, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/27346746/comparison-of-design-strategies-for-a-three-arm-clinical-trial-with-time-to-event-endpoint-power-time-to-analysis-and-operational-aspects
#14
Elina Asikanius, Kaspar Rufibach, Jasmin Bahlo, Gabriele Bieska, Hans Ulrich Burger
To optimize resources, randomized clinical trials with multiple arms can be an attractive option to simultaneously test various treatment regimens in pharmaceutical drug development. The motivation for this work was the successful conduct and positive final outcome of a three-arm randomized clinical trial primarily assessing whether obinutuzumab plus chlorambucil in patients with chronic lympocytic lymphoma and coexisting conditions is superior to chlorambucil alone based on a time-to-event endpoint. The inference strategy of this trial was based on a closed testing procedure...
June 27, 2016: Biometrical Journal. Biometrische Zeitschrift
https://www.readbyqxmd.com/read/27329353/common-and-differential-electrophysiological-mechanisms-underlying-semantic-object-memory-retrieval-probed-by-features-presented-in-different-stimulus-types
#15
Hsueh-Sheng Chiang, Justin Eroh, Jeffrey S Spence, Michael A Motes, Mandy J Maguire, Daniel C Krawczyk, Matthew R Brier, John Hart, Michael A Kraut
How the brain combines the neural representations of features that comprise an object in order to activate a coherent object memory is poorly understood, especially when the features are presented in different modalities (visual vs. auditory) and domains (verbal vs. nonverbal). We examined this question using three versions of a modified Semantic Object Retrieval Test, where object memory was probed by a feature presented as a written word, a spoken word, or a picture, followed by a second feature always presented as a visual word...
August 2016: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/27239893/comparison-of-the-force-velocity-and-power-time-curves-recorded-with-a-force-plate-and-a-linear-velocity-transducer
#16
Amador García-Ramos, Igor Stirn, Vojko Strojnik, Paulino Padial, Blanca De la Fuente, Javier Argüelles-Cienfuegos, Belén Feriche
This study aimed to correlate, compare, and determine the reliability of force, velocity, and power values collected with a force plate (FP) and a linear transducer during loaded jumps. Twenty-three swimmers performed an incremental loading test at 25, 50, 75, and 100% of their own body weight on a FP. A linear velocity transducer (LVT) was attached to the bar to assess the peak and the mean values of force, velocity, and power. Both the peak variables (r = 0.94 - 0.99 for peak force, r = 0.83 - 0.91 for peak velocity, and r = 0...
September 2016: Sports Biomechanics
https://www.readbyqxmd.com/read/27003111/3-min-all-out-test-in-swimming
#17
Ming-Chang Tsai, Scott G Thomas
PURPOSE: To validate the 3-min all-out test (3MT) protocol against the traditional critical speed model (CSM) in front-crawl swimming. METHODS: Ten healthy swimmers or triathletes (mean±SD: age 35.2±10.5yr, height 176.5±5.4cm, body mass 69.6±8.2kg) completed 5 tests (3MT, 100m, 200m, 400m, 800m) over 2 weeks on separate days. Traditional Critical Speed (CS) and Anaerobic Distance Capacity (D') were determined for each of the 3 traditional CSM (linear distance-time: LIN, linear speed-time-1: INV, nonlinear time-speed: NLIN) from the 4 set distance time trials...
March 22, 2016: International Journal of Sports Physiology and Performance
https://www.readbyqxmd.com/read/26940850/the-mechanistic-bases-of-the-power-time-relationship-muscle-metabolic-responses-and-relationships-to-muscle-fibre-type
#18
Anni Vanhatalo, Matthew I Black, Fred J DiMenna, Jamie R Blackwell, Jakob Friis Schmidt, Christopher Thompson, Lee J Wylie, Magni Mohr, Jens Bangsbo, Peter Krustrup, Andrew M Jones
KEY POINTS: The power-asymptote (critical power; CP) of the hyperbolic power-time relationship for high-intensity exercise defines a threshold between steady-state and non-steady-state exercise intensities and the curvature constant (W') indicates a fixed capacity for work >CP that is related to a loss of muscular efficiency. The present study reports novel evidence on the muscle metabolic underpinnings of CP and W' during whole-body exercise and their relationships to muscle fibre type...
August 1, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/26879888/analysis-of-skeletal-muscle-torque-capacity-and-circulating-ceramides-in-patients-with-advanced-heart-failure
#19
Danielle L Brunjes, Mark Dunlop, Christina Wu, Meaghan Jones, Tomoko S Kato, Peter J Kennel, Hilary F Armstrong, Tse-Hwei Choo, Matthew N Bartels, Daniel E Forman, Donna M Mancini, P Christian Schulze
BACKGROUND: Heart failure (HF)-related exercise intolerance is thought to be perpetuated by peripheral skeletal muscle functional, structural, and metabolic abnormalities. We analyzed specific dynamics of muscle contraction in patients with HF compared with healthy, sedentary controls. METHODS: Isometric and isokinetic muscle parameters were measured in the dominant upper and lower limbs of 45 HF patients and 15 healthy age-matched controls. Measurements included peak torque normalized to body weight, work normalized to body weight, power, time to peak torque, and acceleration and deceleration to maximum strength times...
May 2016: Journal of Cardiac Failure
https://www.readbyqxmd.com/read/26861939/methods-of-a-large-prospective-randomised-open-label-blinded-end-point-study-comparing-morning-versus-evening-dosing-in-hypertensive-patients-the-treatment-in-morning-versus-evening-time-study
#20
David A Rorie, Amy Rogers, Isla S Mackenzie, Ian Ford, David J Webb, Bryan Willams, Morris Brown, Neil Poulter, Evelyn Findlay, Wendy Saywood, Thomas M MacDonald
INTRODUCTION: Nocturnal blood pressure (BP) appears to be a better predictor of cardiovascular outcome than daytime BP. The BP lowering effects of most antihypertensive therapies are often greater in the first 12 h compared to the next 12 h. The Treatment In Morning versus Evening (TIME) study aims to establish whether evening dosing is more cardioprotective than morning dosing. METHODS AND ANALYSIS: The TIME study uses the prospective, randomised, open-label, blinded end-point (PROBE) design...
2016: BMJ Open
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