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https://www.readbyqxmd.com/read/28227625/preliminary-investigation-of-energy-comparation-between-gyroscope-electromyography-and-vo2-wearable-sensors
#1
Gareth Williams, Saiyi Li, Pubudu N Pathirana, Gareth Williams, Saiyi Li, Pubudu N Pathirana, Pubudu N Pathirana, Saiyi Li, Gareth Williams
Building on previous experiments in the domain of energy expenditure estimation using wearable sensors, the measurements of energy ratios of a runner on a treadmill were analyzed to observe any commonalities between an inertia measurement unit and an electromyograph sensor. The subjects were equipped with a VO2 gas measurement device, an Inertial Measurement Unit (IMU) measuring gyroscopic activity and an electromyography (EMG) sensor network whilst running at 5 different speeds on a calibrated treadmill. The observed results established a co-linear relationship with the gyroscope based measurements, EMG based measurements with the VO2 measurements...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227610/unraveling-fabrication-and-calibration-of-wearable-gas-monitor-for-use-under-free-living-conditions
#2
Yue Deng, Cheng Chen, Francis Tsow, Xiaojun Xian, Erica Forzani, Yue Deng, Cheng Chen, Francis Tsow, Xiaojun Xian, Erica Forzani, Yue Deng, Xiaojun Xian, Erica Forzani, Cheng Chen, Francis Tsow
Volatile organic compounds (VOC) are organic chemicals that have high vapor pressure at regular conditions. Some VOC could be dangerous to human health, therefore it is important to determine real-time indoor and outdoor personal exposures to VOC. To achieve this goal, our group has developed a wearable gas monitor with a complete sensor fabrication and calibration protocol for free-living conditions. Correction factors for calibrating the sensors, including sensitivity, aging effect, and temperature effect are implemented into a Quick Response Code (QR code), so that the pre-calibrated quartz tuning fork (QTF) sensor can be used with the wearable monitor under free-living conditions...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28224789/ultra-sensitive-room-temperature-operable-gas-sensors-using-p-type-na-zno-nanoflowers-for-diabetes-detection
#3
Rawat Jaisutti, Minkyung Lee, Jaeyoung Kim, Seungbeom Choi, Tae-Jun Ha, Jaekyun Kim, Hyoungsub Kim, Sung Kyu Park, Yong-Hoon Kim
Ultra-sensitive room-temperature operable gas sensors utilizing the photocatalytic activity of Na-doped p-type ZnO (Na:ZnO) nanoflowers (NFs) are demonstrated as a promising candidate for diabetes detection. The flowerlike Na:ZnO nano-particles possessing ultrathin hierarchical nanosheets were synthesized by a facile solution route at a low process temperature of 40 (o)C. It was found that the Na element acting as a p-type dopant was successfully incorporated in the ZnO lattice. Based on the synthesized p-type Na:ZnO NFs, room-temperature operable chemiresistive-type gas sensors were realized, activated by ultraviolet (UV) illumination...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28222433/high-glucose-induces-mouse-mesangial-cell-overproliferation-via-inhibition-of-hydrogen-sulfide-synthesis-in-a-tlr-4-dependent-manner
#4
Tao Ding, Wei Chen, Juan Li, Jiarong Ding, Xiaobin Mei, Haiyan Hu
BACKGROUND/AIMS: Overproliferation of mesangial cells was believed to play an important role in the progress of diabetic nephropathy, one of the primary complications of diabetes. Hydrogen sulfide (H2S), a well-known and pungent gas with the distinctive smell of rotten eggs, was discovered to play a protective role in diabetic nephropathy. METHODS: MTT assay was used to examine the viability of mesangial cells. Small interfering RNA was used to knock down the expression of TLR4 while specific inhibitor LY294002 to suppress the function of PI3K...
February 22, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28218700/comparative-study-of-different-methods-for-soot-sensing-and-filter-monitoring-in-diesel-exhausts
#5
Markus Feulner, Gunter Hagen, Kathrin Hottner, Sabrina Redel, Andreas Müller, Ralf Moos
Due to increasingly tighter emission limits for diesel and gasoline engines, especially concerning particulate matter emissions, particulate filters are becoming indispensable devices for exhaust gas after treatment. Thereby, for an efficient engine and filter control strategy and a cost-efficient filter design, reliable technologies to determine the soot load of the filters and to measure particulate matter concentrations in the exhaust gas during vehicle operation are highly needed. In this study, different approaches for soot sensing are compared...
February 18, 2017: Sensors
https://www.readbyqxmd.com/read/28216670/intraluminal-pressure-patterns-in-the-human-colon-assessed-by-high-resolution-manometry
#6
Ji-Hong Chen, Yuanjie Yu, Zixian Yang, Wen-Zhen Yu, Wu Lan Chen, Hui Yu, Marie Jeong-Min Kim, Min Huang, Shiyun Tan, Hesheng Luo, Jianfeng Chen, Jiande D Z Chen, Jan D Huizinga
Assessment of colonic motor dysfunction is rarely done because of inadequate methodology and lack of knowledge about normal motor patterns. Here we report on elucidation of intraluminal pressure patterns using High Resolution Colonic Manometry during a baseline period and in response to a meal, in 15 patients with constipation, chronically dependent on laxatives, 5 healthy volunteers and 9 patients with minor, transient, IBS-like symptoms but no sign of constipation. Simultaneous pressure waves (SPWs) were the most prominent propulsive motor pattern, associated with gas expulsion and anal sphincter relaxation, inferred to be associated with fast propagating contractions...
February 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28214604/the-measurement-of-dlno-and-dlco-a-manufacturer-s-perspective
#7
X Giraud, N N Le-Dong, K Hogben, J B Martinot
The simultaneous measurement of the lung transfer factor for carbon monoxide (DLCO) and nitric oxide (DLNO) is now available as a powerful method for studying the alveolar-capillary gas exchange. However, application of the DLNO-CO technique in daily settings is still limited by some technical drawbacks. This paper provides a manufacturer's overview of the measuring principles, technical challenges and current available solutions for implementing the DLNO-CO measurement in to a marketed device. This includes the recent developments in technology for NO sensors, latest findings on NO uptake and new statistical methods...
February 15, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28212268/optical-sensor-of-thermal-gas-flow-based-on-fiber-bragg-grating
#8
Xu Jiang, Keda Wang, Junqing Li, Hui Zhan, Zhenan Song, Guohang Che, Guohui Lyu
This paper aims at solving the problem of explosion proof in measurement of thermal gas flow using electronic sensor by presenting a new type of flow sensor by optical fiber heating. A measuring unit based on fiber Bragg grating (FBG) for fluid temperature and a unit for heat dissipation are designed to replace the traditional electronic sensors. The light in C band from the amplified spontaneous emission (ASE) light source is split, with one part used to heat the absorbing coating and the other part used in the signal processing unit...
February 15, 2017: Sensors
https://www.readbyqxmd.com/read/28208836/synthesis-of-graphene-based-sensors-and-application-on-detecting-sf6-decomposing-products-a-review
#9
Xiaoxing Zhang, Hao Cui, Yingang Gui
Graphene-based materials have aroused enormous focus on a wide range of engineering fields because of their unique structure. One of the most promising applications is gas adsorption and sensing. In electrical engineering, graphene-based sensors are also employed as detecting devices to estimate the operation status of gas insulated switchgear (GIS). This paper reviews the main synthesis methods of graphene, gas adsorption, and sensing mechanism of its based sensors, as well as their applications in detecting SF6 decomposing products, such as SO2, H2S, SO2F2, and SOF2, in GIS...
February 13, 2017: Sensors
https://www.readbyqxmd.com/read/28208762/investigation-of-pristine-graphite-oxide-as-room-temperature-chemiresistive-ammonia-gas-sensing-material
#10
Alexander G Bannov, Jan Prášek, Ondřej Jašek, Lenka Zajíčková
Graphite oxide has been investigated as a possible room-temperature chemiresistive sensor of ammonia in a gas phase. Graphite oxide was synthesized from high purity graphite using the modified Hummers method. The graphite oxide sample was investigated using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction, thermogravimetry and differential scanning calorimetry. Sensing properties were tested in a wide range of ammonia concentrations in air (10-1000 ppm) and under different relative humidity levels (3%-65%)...
February 9, 2017: Sensors
https://www.readbyqxmd.com/read/28208624/an-optoelectronic-equivalent-narrowband-filter-for-high-resolution-optical-spectrum-analysis
#11
Kunpeng Feng, Jiwen Cui, Hong Dang, Weidong Wu, Xun Sun, Xuelin Jiang, Jiubin Tan
To achieve a narrow bandwidth optical filter with a wide swept range for new generation optical spectrum analysis (OSA) of high performance optical sensors, an optoelectronic equivalent narrowband filter (OENF) was investigated and a swept optical filter with bandwidth of several MHz and sweep range of several tens of nanometers was built using electric filters and a sweep laser as local oscillator (LO). The principle of OENF is introduced and analysis of the OENF system is presented. Two electric filters are optimized to be RBW filters for high and medium spectral resolution applications...
February 10, 2017: Sensors
https://www.readbyqxmd.com/read/28208308/ultrasensitive-surface-enhanced-raman-scattering-sensor-of-gaseous-aldehydes-as-biomarkers-of-lung-cancer-on-dendritic-ag-nanocrystals
#12
Zhen Zhang, Wei Yu, Jing Wang, Dan Luo, Xuezhi Qiao, Xiaoyun Qin, Tie Wang
Surface-enhanced Raman scattering (SERS) is expected as a technique that even theoretically detected chemicals at the single molecule level by surface plasmon phenomena of noble metal nanostructures. Insensitivity of detecting Raman weak-intensity molecules and low adsorptivity of gaseous molecules on solid substrates are two main factors hindering the application of SERS in gas detectors. In this manuscript, we demonstrated an operational SERS strategy to detect gaseous Raman weak-intensity aldehydes that have been considered as a biomarker of lung cancer for abnormal content was measured in volatile organic compounds (VOCs) of lung cancer patients...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28208249/flexible-passive-near-field-communication-tag-for-multigas-sensing
#13
P Escobedo, M M Erenas, N López-Ruiz, M A Carvajal, S Gonzalez-Chocano, I de Orbe-Payá, L F Capitán-Valley, A J Palma, A Martínez-Olmos
In this work we present a full-passive flexible multigas sensing tag for the determination of oxygen, carbon dioxide, ammonia, and relative humidity readable by a smartphone. This tag is based on near field communication (NFC) technology for energy harvesting and data transmission to a smartphone. The gas sensors show an optic response that is read through high-resolution digital color detectors. A white LED is used as the common optical excitation source for all the sensors. Only a reduced electronics with very low power consumption is required for the reading of the optical responses and data transmission to a remote user...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28207233/nanoscale-pdo-catalyst-functionalized-co3o4-hollow-nanocages-using-mof-templates-for-selective-detection-of-acetone-molecules-in-exhaled-breath
#14
Won-Tae Koo, Sunmoon Yu, Seon-Jin Choi, Ji-Soo Jang, Jun Young Cheong, Il-Doo Kim
The increase of surface area and the functionalization of catalyst are crucial to development of high-performance semiconductor metal oxide (SMO) based chemiresistive gas sensors. Herein, nanoscale catalyst loaded Co3O4 hollow nanocages (HNCs) by using metal-organic framework (MOF) templates have been developed as a new sensing platform. Nanoscale Pd nanoparticles (NPs) were easily loaded on the cavity of Co based zeolite imidazole framework (ZIF-67). The porous structure of ZIF-67 can restrict the size of Pd NPs (2-3 nm) and separate Pd NPs from each other...
February 22, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28205561/the-selective-flow-of-volatile-organic-compounds-in-conductive-polymer-coated-microchannels
#15
Faramarz Hossein-Babaei, Ali Hooshyar Zare
Many gaseous markers of critical biological, physicochemical, or industrial occurrences are masked by the cross-sensitivity of the sensors to the other active components present at higher concentrations. Here, we report the strongly selective diffusion and drift of contaminant molecules in air-filled conductive polymer-coated microfluidic channels for the first time. Monitoring the passage of different target molecules through microchannels coated with Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) revealed that contaminants such as hexane, benzene, and CO pass through the channel unaffected by the coating while methanol, ethanol, and partly acetone are blocked...
February 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205249/exploration-micromechanism-of-vp35-iid-interaction-and-recognition-dsrna-a-molecular-dynamics-simulation
#16
Yan-Jun Zhang, Jing-Na Ding, Hui Zhong, Ju-Guang Han
Multifunctional viral protein (VP35) encoded by the highly pathogenic Ebola viruses (EBOVs) can antagonize host double-stranded RNA (dsRNA) sensors and immune response because of the simultaneous recognition of dsRNA backbone and blunt ends. Mutation of select hydrophobic conserved basic residues within the VP35 inhibitory domain (IID) abrogates its dsRNA-binding activity, and impairs VP35-mediated interferon (IFN) antagonism. Herein the detailed binding mechanism between dsRNA and WT, single mutant, and double mutant were investigated by all-atom molecular dynamics (MD) simulation and binding energy calculation...
February 16, 2017: Proteins
https://www.readbyqxmd.com/read/28199867/plant-wide-modelling-of-phosphorus-transformations-in-wastewater-treatment-systems-impacts-of-control-and-operational-strategies
#17
K Solon, X Flores-Alsina, C Kazadi Mbamba, D Ikumi, E I P Volcke, C Vaneeckhaute, G Ekama, P A Vanrolleghem, D J Batstone, K V Gernaey, U Jeppsson
The objective of this paper is to report the effects that control/operational strategies may have on plant-wide phosphorus (P) transformations in wastewater treatment plants (WWTP). The development of a new set of biological (activated sludge, anaerobic digestion), physico-chemical (aqueous phase, precipitation, mass transfer) process models and model interfaces (between water and sludge line) were required to describe the required tri-phasic (gas, liquid, solid) compound transformations and the close interlinks between the P and the sulfur (S) and iron (Fe) cycles...
February 6, 2017: Water Research
https://www.readbyqxmd.com/read/28198897/metal-oxide-semiconductor-based-gas-sensors-screening-preparation-and-integration
#18
Jian Zhang, Ziyu Qin, Dawen Zeng, Changsheng Xie
Metal-oxide-semiconductor (MOS) based gas sensors have been considered a promising candidate for gas detection over the past few years. However, the sensing properties of MOS-based gas sensors also need to be further enhanced to satisfy the higher requirements for specific applications, such as medical diagnosis based on human breath, gas detection in harsh environments, etc. In these fields, excellent selectivity, low power consumption, a fast response/recovery rate, low humidity dependence and a low limit of detection concentration should be fulfilled simultaneously, which pose great challenges to the MOS-based gas sensors...
February 15, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28195489/composition-and-stability-of-plasma-polymer-films-exhibiting-vertical-chemical-gradients
#19
Patrick Rupper, Marianne Vandenbossche, Laetitia Bernard, Dirk Hegemann, Manfred Heuberger
Controlling the balance between stability and functional group density in grown plasma polymer films is the key to diverse applications such as drug release, tissue-engineered implants, filtration, contact lenses, microfluidics, electrodes, sensors, etc. Highly functional plasma polymer films typically show a limited stability in air or aqueous environments due to mechanisms like molecular reorganization, oxidation, and hydrolysis. Stabilization is achieved by enhancing cross-linking at the cost of the terminal functional groups such as -OH and -COOH, but also -NH2, etc...
February 21, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28193026/detection-of-sub-ppm-concentrations-of-ammonia-in-an-ionic-liquid-enhanced-current-density-using-filled-recessed-microarrays
#20
Ghulam Hussain, Debbie S Silvester
The voltammetric detection of less than 1 ppm of ammonia gas in the room temperature ionic liquid (RTIL) 1-ethyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C2mim][NTf2]) is demonstrated using low-cost planar electrode devices. Three commercially available planar devices were employed, all with platinum (Pt) working electrodes: a thin-film electrode (TFE), a screen-printed electrode (SPE), and a microarray thin film electrode (MATFE), along with an "ideal" conventional Pt microdisk electrode for comparison...
December 20, 2016: Analytical Chemistry
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