keyword
MENU ▼
Read by QxMD icon Read
search

voltage sensor

keyword
https://www.readbyqxmd.com/read/28099415/structure-of-a-eukaryotic-cyclic-nucleotide-gated-channel
#1
Minghui Li, Xiaoyuan Zhou, Shu Wang, Ioannis Michailidis, Ye Gong, Deyuan Su, Huan Li, Xueming Li, Jian Yang
Cyclic-nucleotide-gated channels are essential for vision and olfaction. They belong to the voltage-gated ion channel superfamily but their activities are controlled by intracellular cyclic nucleotides instead of transmembrane voltage. Here we report a 3.5-Å-resolution single-particle electron cryo-microscopy structure of a cyclic-nucleotide-gated channel from Caenorhabditis elegans in the cyclic guanosine monophosphate (cGMP)-bound open state. The channel has an unusual voltage-sensor-like domain, accounting for its deficient voltage dependence...
January 18, 2017: Nature
https://www.readbyqxmd.com/read/28097597/self-powered-active-sensor-with-concentric-topography-of-piezoelectric-fibers
#2
Yiin Kuen Fuh, Zih Ming Huang, Bo Sheng Wang, Shan Chien Li
In this study, we demonstrated a flexible and self-powered sensor based on piezoelectric fibers in the diameter range of nano- and micro-scales. Our work is distinctively different from previous electrospinning research; we fabricated this apparatus precisely via near-field electrospinning which has a spectacular performance to harvest mechanical deformation in arbitrary direction and a novel concentrically circular topography. There are many piezoelectric devices based on electrospinning polymeric fibers. However, the fibers were mostly patterned in parallel lines and they could be actuated in limited direction only...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28094498/barium-titanate-film-interfaces-for-hybrid-composite-energy-harvesters
#3
Christopher C Bowland, Mohammad H Malakooti, Henry A Sodano
Energy harvesting utilizing piezoelectric materials has become an attractive approach for converting mechanical energy into electrical power for low-power electronics. Structural composites are ideally suited for energy scavenging due to the large amount of mechanical energy they are subjected to. Here, a multifunctional composite with embedded sensing and energy harvesting is developed by integrating an active interface into carbon fiber reinforced polymer composites. By modifying the composite matrix, both rigid and flexible multifunctional composites are fabricated...
January 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28076418/sensorless-modeling-of-varying-pulse-width-modulator-resolutions-in-three-phase-induction-motors
#4
Matthew David Marko, Glenn Shevach
A sensorless algorithm was developed to predict rotor speeds in an electric three-phase induction motor. This sensorless model requires a measurement of the stator currents and voltages, and the rotor speed is predicted accurately without any mechanical measurement of the rotor speed. A model of an electric vehicle undergoing acceleration was built, and the sensorless prediction of the simulation rotor speed was determined to be robust even in the presence of fluctuating motor parameters and significant sensor errors...
2017: PloS One
https://www.readbyqxmd.com/read/28075392/a-distance-detector-with-a-strip-magnetic-mosfet-and-readout-circuit
#5
Guo-Ming Sung, Wen-Sheng Lin, Hsing-Kuang Wang
This paper presents a distance detector composed of two separated metal-oxide semiconductor field-effect transistors (MOSFETs), a differential polysilicon cross-shaped Hall plate (CSHP), and a readout circuit. The distance detector was fabricated using 0.18 μm 1P6M Complementary Metal-Oxide Semiconductor (CMOS) technology to sense the magnetic induction perpendicular to the chip surface. The differential polysilicon CSHP enabled the magnetic device to not only increase the magnetosensitivity but also eliminate the offset voltage generated because of device mismatch and Lorentz force...
January 10, 2017: Sensors
https://www.readbyqxmd.com/read/28075344/pull-in-effect-of-suspended-microchannel-resonator-sensor-subjected-to-electrostatic-actuation
#6
Han Yan, Wen-Ming Zhang, Hui-Ming Jiang, Kai-Ming Hu
In this article, the pull-in instability and dynamic characteristics of electrostatically actuated suspended microchannel resonators are studied. A theoretical model is presented to describe the pull-in effect of suspended microchannel resonators by considering the electrostatic field and the internal fluid. The results indicate that the system is subjected to both the pull-in instability and the flutter. The former is induced by the applied voltage which exceeds the pull-in value while the latter occurs as the velocity of steady flow get closer to the critical velocity...
January 8, 2017: Sensors
https://www.readbyqxmd.com/read/28074656/atomistic-modeling-of-ion-conduction-through-the-voltage-sensing-domain-of-the-shaker-k-ion-channel
#7
Mona L Wood, J Alfredo Freites, Francesco Tombola, Douglas J Tobias
Voltage-sensing domains (VSDs) are modular membrane protein units that sense changes in the membrane electrostatic potential, and through conformational changes, regulate a specific function. The VSDs of voltage-dependent K+, Na+, and Ca2+ channels do not conduct ions under physiological conditions, but they can become ion-permeable under pathological conditions through mutations in the voltage sensor, particularly of basic residues (mostly arginines) in the S4 helix. Relatively little is known about the underlying mechanisms of conduction through VSDs...
January 11, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28067859/a-wirelessly-powered-smart-contact-lens-with-reconfigurable-wide-range-and-tunable-sensitivity-sensor-readout-circuitry
#8
Jin-Chern Chiou, Shun-Hsi Hsu, Yu-Chieh Huang, Guan-Ting Yeh, Wei-Ting Liou, Cheng-Kai Kuei
This study presented a wireless smart contact lens system that was composed of a reconfigurable capacitive sensor interface circuitry and wirelessly powered radio-frequency identification (RFID) addressable system for sensor control and data communication. In order to improve compliance and reduce user discomfort, a capacitive sensor was embedded on a soft contact lens of 200 μm thickness using commercially available bio-compatible lens material and a standard manufacturing process. The results indicated that the reconfigurable sensor interface achieved sensitivity and baseline tuning up to 120 pF while consuming only 110 μW power...
January 7, 2017: Sensors
https://www.readbyqxmd.com/read/28064020/impact-of-geometry-changes-in-the-channel-pore-by-the-gating-movements-on-the-channel-s-conductance
#9
Agata Wawrzkiewicz-Jałowiecka, Przemysław Borys, Zbigniew J Grzywna
Kv 1.2 are voltage-dependent potassium channels of great biological importance. Despite the existence of many reports considering structure - function relations of the Kv 1.2 channel's quantitative domains, some details of the voltage gating remain ambiguous, or even unknown. One of the examples is the range of the S4-S6 domains motions involved in channel activation and gating. Another important question is to what extent the channel geometry influences the observable channel conductance at different voltages, and what mechanism stands behind...
January 4, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28056440/fepo4-based-single-chamber-air-cathode-microbial-fuel-cell-for-online-monitoring-levofloxacin
#10
Libin Zeng, Xinyong Li, Yueran Shi, Yefei Qi, Daqiong Huang, Moses Tadé, Shaobin Wang, Shaomin Liu
A bio-electrochemical strategy was developed for constructing a simple and sensitive levofloxacin (LEV) sensor based on a single chamber microbial fuel cell (SC-MFC) using FePO4 nanoparticles (NPs) as the cathode catalyst instead of traditional Pt/C. In this assembled sensor device, FePO4 NPs dramatically promoted the electrooxidation of oxygen on the cathode, which helps to accelerate the voltage output from SC-MFC and can provide a powerful guarantee for LEV detection. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) were used to fully characterize the FePO4 NPs...
December 9, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28054951/analysis-of-the-light-propagation-model-of-the-optical-voltage-sensor-for-suppressing-unreciprocal-errors
#11
Hui Li, Zhida Fu, Liying Liu, Zhili Lin, Wei Deng, Lishuang Feng
An improved temperature-insensitive optical voltage sensor (OVS) with a reciprocal dual-crystal sensing method is proposed. The inducing principle of OVS reciprocity degradation is expounded by taking the different temperature fields of two crystals and the axis-errors of optical components into consideration. The key parameters pertaining to the system reciprocity degeneration in the dual-crystal sensing unit are investigated in order to optimize the optical sensing model based on the Maxwell's electromagnetic theory...
January 3, 2017: Sensors
https://www.readbyqxmd.com/read/28052105/wsn-based-space-charge-density-measurement-system
#12
Dawei Deng, Haiwen Yuan, Jianxun Lv, Yong Ju
It is generally acknowledged that high voltage direct current (HVDC) transmission line endures the drawback of large area, because of which the utilization of cable for space charge density monitoring system is of inconvenience. Compared with the traditional communication network, wireless sensor network (WSN) shows advantages in small volume, high flexibility and strong self-organization, thereby presenting great potential in solving the problem. Additionally, WSN is more suitable for the construction of distributed space charge density monitoring system as it has longer distance and higher mobility...
2017: PloS One
https://www.readbyqxmd.com/read/28049049/bio-electrolytic-sensor-for-rapid-monitoring-of-volatile-fatty-acids-in-anaerobic-digestion-process
#13
Xiangdan Jin, Xiaohu Li, Nannan Zhao, Irini Angelidaki, Yifeng Zhang
This study presents an innovative biosensor that was developed on the basis of a microbial electrolysis cell for fast and reliable measurement of volatile fatty acids (VFA) during anaerobic digestion (AD) process. The bio-electrolytic sensor was first tested with synthetic wastewater containing varying concentrations of VFA. A linear correlation (R(2) = 0.99) between current densities (0.03 ± 0.01 to 2.43 ± 0.12 A/m(2)) and VFA concentrations (5-100 mM) was found. The sensor performance was then investigated under different affecting parameters such as the external voltage, VFA composition ratio, and ionic strength...
December 29, 2016: Water Research
https://www.readbyqxmd.com/read/28048905/th-cd-207b-07-noise-modeling-of-single-photon-avalanche-diode-spad-for-photon-counting-ct-applications
#14
Z Cheng, X Zheng, J Deen, H Peng, L Xing
PURPOSE: Silicon photomultiplier (SiPM) has recently emerged as a promising photodetector for biomedical imaging applications. Due to its high multiplication gain (comparable to PMT), fast timing, low cost and compactness, it is considered a good candidate for photon counting CT. Dark noise is a limiting factor which impacts both energy resolution and detection dynamic range. Our goal is to develop a comprehensive model for noise sources for SiPM sensors. METHODS: The physical parameters used in this work were based upon a test SPAD fabricated in 130nm CMOS process...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048702/tu-h-brc-01-a-new-fabrication-method-for-secondary-skin-collimation-using-3d-scanner-and-3d-printer
#15
J Jung, N Potter, T Suh, C Liu, B Lu
PURPOSE: Using secondary skin collimation (SSC) to protect the critical organ surrounding the tumors is always desirable for electron and/or ortho-voltage treatments. However, the time-consuming and labor-intensive fabrication processes of current method (manually fabricate the lead mask) restrict the general use of SSC. The aim of this study is to develop a new SSC fabrication method using 3D scanning and 3D printing technologies in order to largely decrease the human labor involvement and fabrication time, also improve the fabrication accuracy...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28046344/mo-ab-bra-07-low-dose-imaging-with-avalanche-amorphous-selenium-flat-panel-imager
#16
J Scheuermann, A Howansky, A Goldan, S Leveille, O Tousignant, K Tanioka, W Zhao
PURPOSE: We present the first active matrix flat panel imager (AMFPI) capable of producing x-ray quantum noise limited images at low doses by overcoming the electronic noise through signal amplification by photoconductive avalanche gain (gav). The indirect detector fabricated uses an optical sensing layer of amorphous selenium (a-Se) known as High-Gain Avalanche Rushing Photoconductor (HARP). The detector design is called Scintillator HARP (SHARP)-AMFPI. This is the first image sensor to utilize solid-state HARP technology...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28042830/programmable-low-power-low-noise-capacitance-to-voltage-converter-for-mems-accelerometers
#17
Guillermo Royo, Carlos Sánchez-Azqueta, Cecilia Gimeno, Concepción Aldea, Santiago Celma
In this work, we present a capacitance-to-voltage converter (CVC) for capacitive accelerometers based on microelectromechanical systems (MEMS). Based on a fully-differential transimpedance amplifier (TIA), it features a 34-dB transimpedance gain control and over one decade programmable bandwidth, from 75 kHz to 1.2 MHz. The TIA is aimed for low-cost low-power capacitive sensor applications. It has been designed in a standard 0.18-μm CMOS technology and its power consumption is only 54 μW. At the maximum transimpedance configuration, the TIA shows an equivalent input noise of 42 fA/ Hz at 50 kHz, which corresponds to 100 μg/ Hz ...
December 30, 2016: Sensors
https://www.readbyqxmd.com/read/28024389/tribotronic-transistor-array-as-an-active-tactile-sensing-system
#18
Zhi Wei Yang, Yaokun Pang, Limin Zhang, Cunxin Lu, Jian Chen, Tao Zhou, Chi Zhang, Zhong Lin Wang
Large-scale tactile sensor arrays are of great importance in flexible electronics, human-robot interaction, and medical monitoring. In this paper, a flexible 10 × 10 tribotronic transistor array (TTA) is developed as an active tactile sensing system by incorporating field-effect transistor units and triboelectric nanogenerators into a polyimide substrate. The drain-source current of each tribotronic transistor can be individually modulated by the corresponding external contact, which has induced a local electrostatic potential to act as the conventional gate voltage...
December 27, 2016: ACS Nano
https://www.readbyqxmd.com/read/28013017/direct-detection-of-cysteine-using-functionalized-batio3-nanoparticles-film-based-self-powered-biosensor
#19
Sophia Selvarajan, Nagamalleswara Rao Alluri, Arunkumar Chandrasekhar, Sang-Jae Kim
Simple, novel, and direct detection of clinically important biomolecules have continuous demand among scientific community as well as in market. Here, we report the first direct detection and facile fabrication of a cysteine-responsive, film-based, self-powered device. NH2 functionalized BaTiO3 nanoparticles (BT-NH2 NPs) suspended in a three-dimensional matrix of an agarose (Ag) film, were used for cysteine detection. BaTiO3 nanoparticles (BT NPs) semiconducting as well as piezoelectric properties were harnessed in this study...
December 6, 2016: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/28012175/clinical-implications-of-scn1a-missense-and-truncation-variants-in-a-large-japanese-cohort-with-dravet-syndrome
#20
Atsushi Ishii, Joseph C Watkins, Debbie Chen, Shinichi Hirose, Michael F Hammer
OBJECTIVE: Two major classes of SCN1A variants are associated with Dravet syndrome (DS): those that result in haploinsufficiency (truncating) and those that result in an amino acid substitution (missense). The aim of this retrospective study was to describe the first large cohort of Japanese patients with SCN1A mutation-positive DS (n = 285), and investigate the relationship between variant (type and position) and clinical expression and response to treatment. METHODS: We sequenced all exons and intron-exon boundaries of SCN1A in our cohort, investigated differences in the distribution of truncating and missense variants, tested for associations between variant type and phenotype, and compared these patterns with those of cohorts with milder epilepsy and healthy individuals...
December 24, 2016: Epilepsia
keyword
keyword
51240
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"