Read by QxMD icon Read


Yanan Guo, Miaomiao Gong, Yushu Li, Yunling Liu, Xincun Dou
ZnO-CuO mesocrystal was prepared via topotactic transformation using one-step direct annealing of aqueous precursor solution and assembled into a H2S sensor. The ZnO-CuO mesocrystal-based sensor possesses good linearity and high sensitivity in the low-concentration range (10-200 ppb). Compared to pure CuO, the as-prepared ZnO-CuO mesocrystal sensor exhibited superior H2S sensing performance with a response ranging from 8.6 to 152 % towards H2S concentrations from 10 ppb to 10 ppm when applied at the optimized working temperature of 125 °C...
December 2016: Nanoscale Research Letters
Scott Monteith, Tasha Glenn
Automated decision-making by computer algorithms based on data from our behaviors is fundamental to the digital economy. Automated decisions impact everyone, occurring routinely in education, employment, health care, credit, and government services. Technologies that generate tracking data, including smartphones, credit cards, websites, social media, and sensors, offer unprecedented benefits. However, people are vulnerable to errors and biases in the underlying data and algorithms, especially those with mental illness...
December 2016: Current Psychiatry Reports
Andreas Schuchert, Johannes Brachmann
No abstract text is available yet for this article.
October 25, 2016: Herzschrittmachertherapie & Elektrophysiologie
Mingshun Jiang, Yaozhang Sai, Xiangyi Geng, Qingmei Sui, Xiaohui Liu, Lei Jia
We proposed and studied an impact detection system based on a fiber Bragg grating (FBG) sensor array and multiple signal classification (MUSIC) algorithm to determine the location and the number of low velocity impacts on a carbon fiber-reinforced polymer (CFRP) plate. A FBG linear array, consisting of seven FBG sensors, was used for detecting the ultrasonic signals from impacts. The edge-filter method was employed for signal demodulation. Shannon wavelet transform was used to extract narrow band signals from the impacts...
October 24, 2016: Sensors
David Salido-Monzú, Francisco J Meca-Meca, Ernesto Martín-Gorostiza, José L Lázaro-Galilea
A wide range of measuring applications rely on phase estimation on sinusoidal signals. These systems, where the estimation is mainly implemented in the digital domain, can generally benefit from the use of undersampling to reduce the digitizer and subsequent digital processing requirements. This may be crucial when the application characteristics necessarily imply a simple and inexpensive sensor. However, practical limitations related to the phase stability of the band-pass filter prior digitization establish restrictions to the reduction of noise bandwidth...
October 24, 2016: Sensors
Li-Yang Shao, Xinpu Zhang, Haijun He, Zhiyong Zhang, Xihua Zou, Bin Luo, Wei Pan, Lianshan Yan
An optical fiber temperature and torsion sensor has been proposed by employing the Lyot-Sagnac interferometer, which was composed by inserting two sections of high-birefringence (HiBi) fiber into the Sagnac loop. The two inserted sections of HiBi fiber have different functions; while one section acts as the temperature sensitive region, the other can be used as reference fiber. The temperature and twist sensor based on the proposed interferometer structure have been experimentally demonstrated. The experimental results show that the envelope of the output spectrum will shift with the temperature evolution...
October 24, 2016: Sensors
Mansoureh Tajaddod, Andrea Tanzer, Konstantin Licht, Michael T Wolfinger, Stefan Badelt, Florian Huber, Oliver Pusch, Sandy Schopoff, Michael Janisiw, Ivo Hofacker, Michael F Jantsch
BACKGROUND: Short interspersed elements (SINEs) represent the most abundant group of non-long-terminal repeat transposable elements in mammalian genomes. In primates, Alu elements are the most prominent and homogenous representatives of SINEs. Due to their frequent insertion within or close to coding regions, SINEs have been suggested to play a crucial role during genome evolution. Moreover, Alu elements within mRNAs have also been reported to control gene expression at different levels...
October 25, 2016: Genome Biology
Maxence Borot de Battisti, Baudouin Denis de Senneville, Metha Maenhout, Jan J W Lagendijk, Marco van Vulpen, Gilion Hautvast, Dirk Binnekamp, Marinus A Moerland
PURPOSE: The development of MR-guided high dose rate (HDR) brachytherapy is under investigation due to the excellent tumor and organs at risk visualization of MRI. However, MR-based localization of needles (including catheters or tubes) has inherently a low update rate and the required image interpretation can be hampered by signal voids arising from blood vessels or calcifications limiting the precision of the needle guidance and reconstruction. In this paper, a new needle tracking prototype is investigated using fiber Bragg gratings (FBG)-based sensing: this prototype involves a MR-compatible stylet composed of three optic fibers with nine sets of embedded FBG sensors each...
October 2016: Medical Physics
L A Bitzer, K Neumann, N Benson, R Schmechel
Super-resolution (SR) is a technique used in digital image processing to overcome the resolution limitation of imaging systems. In this process, a single high resolution image is reconstructed from multiple low resolution images. SR is commonly used for CCD and CMOS (Complementary Metal-Oxide-Semiconductor) sensor images, as well as for medical applications, e.g., magnetic resonance imaging. Here, we demonstrate that super-resolution can be applied with scanning light stimulation (LS) systems, which are common to obtain space-resolved electro-optical parameters of a sample...
September 2016: Review of Scientific Instruments
F Minary, D Rabus, G Martin, J-M Friedt
Stroboscopy provides an energy and computationally efficient means of sampling radiofrequency and microwave signals assumed to be reproducible under external excitation. While well known for impulse mode RADAR receivers, we here investigate its use for interrogating surface acoustic wave (SAW) transducers acting as passive cooperative targets. Amongst the originality of the implementation is the need to keep phase coherence between successive pulse generations which last up to tens of the radiofrequency periods to optimally transfer energy to the transducer...
September 2016: Review of Scientific Instruments
Eiji Arima, Huanfei Wen, Yoshitaka Naitoh, Yan Jun Li, Yasuhiro Sugawara
The atomic force microscopy (AFM) is a very important tool for imaging and investigating the complex force interactions on sample surfaces with high spatial resolution. In the AFM, two types of detection systems of the tip-sample interaction forces have been used: an optical detection system and an electrical detection system. In optical detection systems, such as optical beam deflection system or optical fiber interferometer system, both the lateral and the vertical tip-sample forces can be measured simultaneously...
September 2016: Review of Scientific Instruments
Ruth A Miller, Hongyun So, Heather C Chiamori, Ateeq J Suria, Caitlin A Chapin, Debbie G Senesky
A miniature sensor for detecting the orientation of incident ultraviolet light was microfabricated using gallium nitride (GaN)-on-sapphire substrates and semi-transparent interdigitated gold electrodes for sun sensing applications. The individual metal-semiconductor-metal photodetector elements were shown to have a stable and repeatable response with a high sensitivity (photocurrent-to-dark current ratio (PDCR) = 2.4 at -1 V bias) and a high responsivity (3200 A/W at -1 V bias) under ultraviolet (365 nm) illumination...
September 2016: Review of Scientific Instruments
Bin Huang, Xiaomeng Wang, Chengwei Li, Jiajing Yi, Rongsheng Lu, Jiayue Tao
This paper describes the design, working principle, as well as calibration of an air-floating six-axis force measurement platform, where the floating plate and nozzles were connected without contact, preventing inter-dimensional coupling and increasing precision significantly. The measurement repeatability error of the force size in the platform is less than 0.2% full scale (FS), which is significantly better than the precision of 1% FS in the six-axis force sensors on the current market. We overcame the difficulties of weight loading device in high-precision calibration by proposing a self-calibration method based on the floating plate gravity and met the calibration precision requirement of 0...
September 2016: Review of Scientific Instruments
John R Kirtley, Lisa Paulius, Aaron J Rosenberg, Johanna C Palmstrom, Connor M Holland, Eric M Spanton, Daniel Schiessl, Colin L Jermain, Jonathan Gibbons, Y-K-K Fung, Martin E Huber, Daniel C Ralph, Mark B Ketchen, Gerald W Gibson, Kathryn A Moler
Superconducting QUantum Interference Device (SQUID) microscopy has excellent magnetic field sensitivity, but suffers from modest spatial resolution when compared with other scanning probes. This spatial resolution is determined by both the size of the field sensitive area and the spacing between this area and the sample surface. In this paper we describe scanning SQUID susceptometers that achieve sub-micron spatial resolution while retaining a white noise floor flux sensitivity of ≈2μΦ0/Hz(1/2). This high spatial resolution is accomplished by deep sub-micron feature sizes, well shielded pickup loops fabricated using a planarized process, and a deep etch step that minimizes the spacing between the sample surface and the SQUID pickup loop...
September 2016: Review of Scientific Instruments
Yoshio Okada, Matti Hämäläinen, Kevin Pratt, Anthony Mascarenas, Paul Miller, Menglai Han, Jose Robles, Anders Cavallini, Bill Power, Kosal Sieng, Limin Sun, Seok Lew, Chiran Doshi, Banu Ahtam, Christoph Dinh, Lorenz Esch, Ellen Grant, Aapo Nummenmaa, Douglas Paulson
We developed a 375-channel, whole-head magnetoencephalography (MEG) system ("BabyMEG") for studying the electrophysiological development of human brain during the first years of life. The helmet accommodates heads up to 95% of 36-month old boys in the USA. The unique two-layer sensor array consists of: (1) 270 magnetometers (10 mm diameter, ∼15 mm coil-to-coil spacing) in the inner layer, (2) thirty-five three-axis magnetometers (20 mm × 20 mm) in the outer layer 4 cm away from the inner layer. Additionally, there are three three-axis reference magnetometers...
September 2016: Review of Scientific Instruments
Ann-Lauriene Haag, Zeno Schumacher, Peter Grutter
A detailed analysis of the temporal surface stress evolution for potential-driven adsorption of ions is discussed. A gold-coated cantilever is used to simultaneously measure the change in surface stress as well as the current response during an applied potential step. In this electrochemical configuration, the cantilever acts as the working electrode, a platinum wire as the counter electrode, and the Ag/AgCl (sat. KCl) electrode as the reference electrode. To study the time-dependent signal and the sensitivity of the cantilever response, the frequency of the potential step applied to the cantilever is varied from 1 s to 0...
October 21, 2016: Journal of Chemical Physics
Richard Gondosiswanto, Christian A Gunawan, David Brynn Hibbert, Jason Brian Harper, Chuan Zhao
Solvent volatility represents one of the major hurdles to the reliability and reproducibility of the lab-on-a-chip systems for large scale applications. Here we demonstrate a strategy of combining non-volatile and functionalized ionic liquids with microcontact printing for fabrication of "wall-less" microreactors with high reproducibility and high throughput. A range of thiol-functionalized ionic liquids have been synthesized and used as inks for microcontact printing of ionic liquid microdroplets arrays onto gold chips...
October 26, 2016: ACS Applied Materials & Interfaces
Michael A Lee, Naveed Bakh, Gili Bisker, Emery N Brown, Michael S Strano
Cortisol is an important glucocorticoid hormone whose biochemistry influences numerous physiological and pathological processes. Moreover, it is a biomarker of interest for a number of conditions, including posttraumatic stress disorder, Cushing's syndrome, Addison's disease, and others. An implantable biosensor capable of real time monitoring of cortisol concentrations in adipose tissue may revolutionize the diagnosis and treatment of these disorders, as well as provide an invaluable research tool. Toward this end, a mathematical model, informed by the physiological literature, is developed to predict dynamic cortisol concentrations in adipose, muscle, and brain tissues, where a significant number of important processes with cortisol occur...
October 26, 2016: Advanced Healthcare Materials
Darragh F Whelan, Martin A O'Reilly, Tomás E Ward, Eamonn Delahunt, Brian Caulfield
BACKGROUND: The single leg squat (SLS) is a common lower limb rehabilitation exercise. It is also frequently used as an evaluative exercise to screen for an increased risk of lower limb injury. To date athlete / patient SLS technique has been assessed using expensive laboratory equipment or subjective clinical judgement; both of which are not without shortcomings. Inertial measurement units (IMUs) may offer a low cost solution for the objective evaluation of athlete / patient SLS technique...
October 26, 2016: Methods of Information in Medicine
Eunjeong Park, Sunghoon I Lee, Hyo Suk Nam, Jordan H Garst, Alex Huang, Andrew Campion, Monica Arnell, Nima Ghalehsariand, Sangsoo Park, Hyuk-Jae Chang, Daniel C Lu, Majid Sarrafzadeh
BACKGROUND: Alcohol ingestion influences sensory-motor function and the overall well-being of individuals. Detecting alcohol-induced impairments in gait in daily life necessitates a continuous and unobtrusive gait monitoring system. OBJECTIVES: This paper introduces the development and use of a non-intrusive monitoring system to detect changes in gait induced by alcohol intoxication. METHODS: The proposed system employed a pair of sensorized smart shoes that are equipped with pressure sensors on the insole...
October 26, 2016: Methods of Information in Medicine
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"