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https://www.readbyqxmd.com/read/28227592/saw-lc-coupled-resonator-wideband-vco-for-medical-telemetry
#1
Madhav Venkateswaran, Mark Hillig, James E Brown, Paul J Stadnik, Jeffrey A Von Arx, Brian Sutton, Larry J Stotts, Madhav Venkateswaran, Mark Hillig, James E Brown, Paul J Stadnik, Jeffrey A Von Arx, Brian Sutton, Larry J Stotts, Mark Hillig, Jeffrey A Von Arx, Madhav Venkateswaran, Brian Sutton, James E Brown, Paul J Stadnik, Larry J Stotts
Wireless links with implantable devices can help in real-time monitoring of symptoms, irregularities, implanted device efficacy and their reconfiguration. We present the design of a low-power wideband voltage controlled oscillator (VCO) to facilitate implantable wireless telemetry. A coupled SAW-LC resonator design combines high Q and spectral purity of a SAW element and tunability of an LC-tank. The designed 2.7 MHz bandwidth VCO is suitable for full duplex communication protocols in the MedRadio band with frequency agility and higher duty cycles, in conformance with FCC regulations...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227591/an-inductive-narrow-pulse-rfid-telemetry-system-for-gastric-slow-waves-monitoring
#2
Amir Javan-Khoskholgh, Zaid Abukhalaf, Ji Li, Larry S Miller, Mehdi Kiani, Aydin Farajidavar, Amir Javan-Khoskholgh, Zaid Abukhalaf, Ji Li, Larry S Miller, Mehdi Kiani, Aydin Farajidavar, Larry S Miller, Amir Javan-Khoskholgh, Ji Li, Mehdi Kiani, Zaid Abukhalaf
We present a passive data telemetry system for real-time monitoring of gastric electrical activity of a living subject. The system is composed of three subsystems: an implantable unit (IU), a wearable unit (WU), and a stationary unit (SU). Data communication between the IU and WU is based on a radio-frequency identification (RFID) link operating at 13.56 MHz. Since wireless power transmission and reverse data telemetry system share the same inductive interface, a load shift keying (LSK)-based differential pulse position (DPP) coding data communication with only 6...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227590/elastic-ribbon-like-piezoelectric-energy-harvester-for-wearable-devices-with-stretchable-surfaces
#3
You Liang Lionel, Wong, Gary K Fedder, You Liang Lionel, Wong, Gary K Fedder
This paper presents an elastic ribbon-like piezoelectric energy harvester which is targeted for skin-wearable devices by harnessing the movements of stretchable surfaces. The device aims to power up smart thin stick-on devices for healthcare monitoring. By embedding a ribbon-like PVDF film in a flexible elastomer, Ecoflex, the device is potentially able to stretch 34%, while maintaining internal strain of the film below its plastic deformation limit. Alternate electrode layout and bimorph configuration help to reduce charge cancellation, while increasing overall effectiveness...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227582/reconfigurable-analog-classifier-for-knee-joint-rehabilitation
#4
Sahil Shah, Hakan Toreyin, Omer T Inan, Jennifer Hasler, Sahil Shah, Hakan Toreyin, Omer T Inan, Jennifer Hasler, Sahil Shah, Jennifer Hasler, Omer T Inan, Hakan Toreyin
We present a System-On-Chip Field Programmable Analog Array (FPAA) for analyzing and processing the signals off an accelerometer for a wearable joint health assessment device. FPAAs have been shown to compute with an efficiency of 1000 times, as well as area efficiencies of 100 times, more than digital solutions. This work presents a low power signal processing system which allows us to extract features from the output of the accelerometer. These features are used by the classifier, implemented using a vector matrix multiplication and a two output 1-winner-take-all, to detect flexion and extension cycles in the subject...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227135/quantification-of-peripheral-and-central-blood-pressure-variability-using-a-time-frequency-method
#5
Z Kouchaki, M Butlin, A Qasem, A P Avolio, Z Kouchaki, M Butlin, A Qasem, A P Avolio, Z Kouchaki, A P Avolio, M Butlin, A Qasem
Systolic blood pressure variability (BPV) is associated with cardiovascular events. As the beat-to-beat variation of blood pressure is due to interaction of several cardiovascular control systems operating with different response times, assessment of BPV by spectral analysis using the continuous measurement of arterial pressure in the finger is used to differentiate the contribution of these systems in regulating blood pressure. However, as baroreceptors are centrally located, this study considered applying a continuous aortic pressure signal estimated noninvasively from finger pressure for assessment of systolic BPV by a time-frequency method using Short Time Fourier Transform (STFT)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226960/a-robotic-exoskeleton-to-treat-crouch-gait-from-cerebral-palsy-initial-kinematic-and-neuromuscular-evaluation
#6
Zachary F Lerner, Diane L Damiano, Thomas C Bulea, Zachary F Lerner, Diane L Damiano, Thomas C Bulea, Diane L Damiano, Zachary F Lerner, Thomas C Bulea
A robotic exoskeleton was designed for individuals with crouch gait caused by cerebral palsy with the intent to supplement existing muscle function during walking. The aim of this study was to evaluate how powered knee extension assistance provided during stance and swing phases of the gait cycle affect knee kinematics, and knee flexor and extensor muscle activity. Muscle activity and kinematic data were collected from four individuals with crouch gait from cerebral palsy during their normal walking condition and while walking with the exoskeleton under stance, swing, and stance & swing assistance...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226882/development-of-a-real-time-activity-monitoring-android-application-utilizing-smartstep
#7
Nagaraj Hegde, Edward Melanson, Edward Sazonov, Nagaraj Hegde, Edward Melanson, Edward Sazonov, Nagaraj Hegde, Edward Melanson, Edward Sazonov
Footwear based activity monitoring systems are becoming popular in academic research as well as consumer industry segments. In our previous work, we had presented developmental aspects of an insole based activity and gait monitoring system-SmartStep, which is a socially acceptable, fully wireless and versatile insole. The present work describes the development of an Android application that captures the SmartStep data wirelessly over Bluetooth Low energy (BLE), computes features on the received data, runs activity classification algorithms and provides real time feedback...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28226724/investigation-of-driving-forces-of-cerebrospinal-fluid-motion-by-power-and-frequency-mapping-based-on-asynchronous-phase-contrast-technique
#8
Saeko Sunohara, Satoshi Yatsushiro, Ken Takizawa, Mitsunori Matsumae, Nao Kajihara, Kagayaki Kuroda, Saeko Sunohara, Satoshi Yatsushiro, Ken Takizawa, Mitsunori Matsumae, Nao Kajihara, Kagayaki Kuroda, Ken Takizawa, Saeko Sunohara, Kagayaki Kuroda, Nao Kajihara, Mitsunori Matsumae, Satoshi Yatsushiro
To classify the cardiac- and respiratory-driven cerebrospinal fluid (CSF) motions, asynchronous 2D phase contrast (PC) of magnetic resonance imaging (MRI) with 217 ms time resolution in conjunction with power and frequency mapping was performed for 7 healthy subjects under respiration guidance. In the frequency domain, the cardiac-driven motion was at around 1.29±0.21 Hz and respiratory-driven motion was at 0.16±0.01 Hz under 6 sec respiratory cycle. Two different techniques were proposed for characterizing the motions; one was power-map (P-map) depicting integrated power spectrum in a selected band, and the other was frequency-map (F-map) delineating the frequency of maximum peak in power spectral density (PSD)...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28225586/multicolor-electrochromic-devices-based-on-molecular-plasmonics
#9
Grant J Stec, Adam Lauchner, Yao Cui, Peter Nordlander, Naomi J Halas
Polycyclic aromatic hydrocarbon (PAH) molecules, the hydrogen-terminated, subnanometer scale version of graphene, support plasmon resonances with the addition or removal of a single electron. Typically colorless when neutral, they are transformed into vivid optical absorbers in either their positively or negatively charged states. Here we demonstrate a low-voltage, multistate electrochromic device based on PAH plasmon resonances that can be reversibly switched between nearly colorless (0 V), olive (+4 V), and royal blue (-3...
February 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28225477/mechanical-efficiency-in-chronic-obstructive-pulmonary-disease
#10
Willem Gosens, Alex J Vanʼt Hul, Joost M Oomen, Matthijs K C Hesselink, Lars B Borghouts
PURPOSE: The primary aims of this study were (1) to evaluate whole-body mechanical efficiency (ME) in a large group of chronic obstructive pulmonary disease (COPD) patients with a wide range of degrees of illness and (2) to examine how ME in COPD is related to absolute work rate and indices of disease severity during exercise testing. METHODS: A total of 569 patients (301 male patients; GOLD stage I: 28, GOLD stage II: 166, GOLD stage III: 265, and GOLD stage IV: 110) with chronic obstructive pulmonary disease (COPD) were included in the data analysis...
March 2017: Journal of Cardiopulmonary Rehabilitation and Prevention
https://www.readbyqxmd.com/read/28224912/high-throughput-screening-and-quantitation-of-guanidino-and-ureido-compounds-using-liquid-chromatography-drift-tube-ion-mobility-spectrometry-mass-spectrometry
#11
Ruo-Jing Fan, Fang Zhang, Xiu-Ping Chen, Wan-Shu Qi, Qing Guan, Tuan-Qi Sun, Yin-Long Guo
The present work focused on the high-throughput screening and quantitation of guanidino compounds (GCs) and ureido compounds (UCs) in human thyroid tissues. The strategy employed benzylic rearrangement stable isotope labeling (BRSIL) for the sample preparation and then detection using liquid chromatography-drift tube ion mobility spectrometry-quadrupole time of flight mass spectrometry (LC-DTIMS-QTOF MS). A short reversed-phase LC realized an on-line desalting and a measurement cycle of 5.0 min. DTIMS separation enhanced the better specificity and selectivity for the benzil labeled GCs and UCs...
April 8, 2017: Analytica Chimica Acta
https://www.readbyqxmd.com/read/28224685/bubble-sheet-like-interface-design-with-an-ultrastable-solid-electrolyte-layer-for-high-performance-dual-ion-batteries
#12
Panpan Qin, Meng Wang, Na Li, Haili Zhu, Xuan Ding, Yongbing Tang
In this work, a bubble-sheet-like hollow interface design on Al foil anode to improve the cycling stability and rate performance of aluminum anode based dual-ion battery is reported, in which, a carbon-coated hollow aluminum anode is used as both anode materials and current collector. This anode structure can guide the alloying position inside the hollow nanospheres, and also confine the alloy sizes within the hollow nanospheres, resulting in significantly restricted volumetric expansion and ultrastable solid electrolyte interface (SEI)...
February 22, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28223939/no-influence-of-transcutaneous-electrical-nerve-stimulation-on-exercise-induced-pain-and-5-km-cycling-time-trial-performance
#13
Andrew W Hibbert, François Billaut, Matthew C Varley, Remco C J Polman
Introduction: Afferent information from exercising muscle contributes to the sensation of exercise-induced muscle pain. Transcutaneous electrical nerve stimulation (TENS) delivers low-voltage electrical currents to the skin, inhibiting nociceptive afferent information. The use of TENS in reducing perceptions of exercise-induced pain has not yet been fully explored. This study aimed to investigate the effect of TENS on exercise-induced muscle pain, pacing strategy, and performance during a 5-km cycling time trial (TT)...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28222810/does-nordic-walking-restore-the-temporal-organization-of-gait-variability-in-parkinson-s-disease
#14
Thibault Warlop, Christine Detrembleur, Maïté Buxes Lopez, Gaëtan Stoquart, Thierry Lejeune, Anne Jeanjean
BACKGROUND: Gait disorders of Parkinson's disease (PD) are characterized by the breakdown of the temporal organization of stride duration variability that was tightly associated to dynamic instability in PD. Activating the upper body during walking, Nordic Walking (NW) may be used as an external cueing to improve spatiotemporal parameters of gait, such as stride length or gait variability, in PD. The aim of this study was to evaluate the beneficial effects of NW on temporal organization of gait variability and spatiotemporal gait variables in PD...
February 21, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28222667/curcumin-inhibits-cancer-progression-through-regulating-expression-of-micrornas
#15
Siying Zhou, Sijie Zhang, Hongyu Shen, Wei Chen, Hanzi Xu, Xiu Chen, Dawei Sun, Shanliang Zhong, Jianhua Zhao, Jinhai Tang
Curcumin, a major yellow pigment and spice in turmeric and curry, is a powerful anti-cancer agent. The anti-tumor activities of curcumin include inhibition of tumor proliferation, angiogenesis, invasion and metastasis, induction of tumor apoptosis, increase of chemotherapy sensitivity, and regulation of cell cycle and cancer stem cell, indicating that curcumin maybe a strong therapeutic potential through modulating various cancer progression. It has been reported that microRNAs as small noncoding RNA molecules are related to cancer progression, which can be regulated by curcumin...
February 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28220954/is-god-just-a-big-person-children-s-conceptions-of-god-across-cultures-and-religious-traditions
#16
Melanie A Nyhof, Carl N Johnson
The present research examines the influence of intuitive cognitive domain and religion on the God concepts of children growing up in religious traditions that present God in ways varying from abstract to concrete. In Study 1, we compared children from a Latter-Day Saints (LDS) background with those from mainstream Christian (MC) backgrounds in the United States. In contrast to MC theology that holds that God is all-knowing, all-powerful, and disembodied, LDS theology depicts God as embodied. In Study 1, 3- to 7-year-olds from LDS and MC backgrounds were asked about supernatural mental and immaterial attributes of God, a ghost, a dad, and a bug...
March 2017: British Journal of Developmental Psychology
https://www.readbyqxmd.com/read/28218802/non-invasive-ventilation-for-cystic-fibrosis
#17
REVIEW
Fidelma Moran, Judy M Bradley, Amanda J Piper
BACKGROUND: Non-invasive ventilation may be a means to temporarily reverse or slow the progression of respiratory failure in cystic fibrosis by providing ventilatory support and avoiding tracheal intubation. Using non-invasive ventilation, in the appropriate situation or individuals, can improve lung mechanics through increasing airflow and gas exchange and decreasing the work of breathing. Non-invasive ventilation thus acts as an external respiratory muscle. This is an update of a previously published review...
February 20, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28218520/alteration-of-the-copper-binding-capacity-of-iron-rich-humic-colloids-during-transport-from-peatland-to-marine-waters
#18
Francois Muller, Marco Cuscov
Blanket bogs contain vast amounts of Sphagnum-derived organic substances which can act as powerful chelators for dissolved iron and thus enhance its export to the coastal ocean. To investigate the variations in quantity and quality of these exports, adsorptive cathodic stripping voltammetry (CSV) was used to characterise the metal binding properties of molecular weight-fractionated dissolved organic matter (MW-fractionated DOM) in the catchment and coastal plume of a small peat-draining river over a seasonal cycle...
February 20, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28216668/adenine-functionalized-spongy-graphene-for-green-and-high-performance-supercapacitors
#19
Dalia M El-Gendy, Nabil A Abdel Ghany, E E Foad El Sherbini, Nageh K Allam
A simple method is demonstrated to prepare spongy adenine-functionalized graphene (SFG) as interconnected, porous 3-dimensional (3D) network crinkly sheets. Such 3D network structure provides better contact at the electrode/electrolyte interface and facilitates the charge transfer kinetics. The fabricated SFG was characterized by X-ray diffraction (XRD), FTIR, scanning electron microscopy (FESEM), Raman spectroscopy, thermogravimetric analysis (TGA), UV-vis absorption spectroscopy, and transmission electron microscopy (TEM)...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28214673/duffy-antigen-receptor-for-chemokines-darc-expressing-in-cancer-cells-inhibits-tumor-progression-by-suppressing-cxcr2-signaling-in-human-pancreatic-ductal-adenocarcinoma
#20
Shintaro Maeda, Satoshi Kuboki, Hiroyuki Nojima, Hiroaki Shimizu, Hideyuki Yoshitomi, Katsunori Furukawa, Masaru Miyazaki, Masayuki Ohtsuka
BACKGROUND: Pancreatic ductal adenocarcinoma (PDAC) has a dismal prognosis. Chemokines play important roles in the progression of many malignancies; however, the role of chemokine receptor expression in clinical cases of PDAC is unclear. Moreover, little is known about DARC, a decoy receptor of CXC chemokines, in the regulation of tumor progression. METHODS: Functions of chemokine receptors were evaluated using surgical specimens collected from PDAC patients, and PDAC cell lines...
February 16, 2017: Cytokine
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