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https://www.readbyqxmd.com/read/29145500/estimation-of-stress-distribution-in-ferromagnetic-tensile-specimens-using-low-cost-eddy-current-stress-measurement-system-and-bp-neural-network
#1
Jianwei Li, Weimin Zhang, Weiqin Zeng, Guolong Chen, Zhongchao Qiu, Xinyuan Cao, Xuanyi Gao
Estimation of the stress distribution in ferromagnetic components is very important for evaluating the working status of mechanical equipment and implementing preventive maintenance. Eddy current testing technology is a promising method in this field because of its advantages of safety, no need of coupling agent, etc. In order to reduce the cost of eddy current stress measurement system, and obtain the stress distribution in ferromagnetic materials without scanning, a low cost eddy current stress measurement system based on Archimedes spiral planar coil was established, and a method based on BP neural network to obtain the stress distribution using the stress of several discrete test points was proposed...
2017: PloS One
https://www.readbyqxmd.com/read/29145447/from-bead-to-rod-comparison-of-theories-by-measuring-translational-drag-coefficients-of-micron-sized-magnetic-bead-chains-in-stokes-flow
#2
Kaiyuan Yang, Chen Lu, Xiaodan Zhao, Ryo Kawamura
Frictional drag force on an object in Stokes flow follows a linear relationship with the velocity of translation and a translational drag coefficient. This drag coefficient is related to the size, shape, and orientation of the object. For rod-like objects, analytical solutions of the drag coefficients have been proposed based on three rough approximations of the rod geometry, namely the bead model, ellipsoid model, and cylinder model. These theories all agree that translational drag coefficients of rod-like objects are functions of the rod length and aspect ratio, but differ among one another on the correction factor terms in the equations...
2017: PloS One
https://www.readbyqxmd.com/read/29145434/is-the-euroscore-ii-reliable-to-estimate-operative-mortality-among-octogenarians
#3
Sophie Provenchère, Arnaud Chevalier, Walid Ghodbane, Claire Bouleti, Philippe Montravers, Dan Longrois, Bernard Iung
OBJECTIVES: Concerns have been raised about the predictive performance (PP) of the EuroSCORE I (ES I) to estimate operative mortality (OM) of patients aged ≥80. The EuroSCORE II (ES II) has been described to have better PP of OM but external validations are scarce. Furthermore, the PP of ES II has not been investigated among the octogenarians. The goal of the study was to compare the PP of ES II and ES I among the overall population and patients ≥ 80. METHODS: The ES I and ES II were computed for 7161 consecutive patients who underwent major cardiac surgery in a 7-year period...
2017: PloS One
https://www.readbyqxmd.com/read/29145074/ratiometric-electrochemical-assay-for-sensitive-detecting-microrna-based-on-dual-amplification-mechanism-of-duplex-specific-nuclease-and-hybridization-chain-reaction
#4
Yan-Hong Yuan, Bao-Zhu Chi, Shao-Hua Wen, Ru-Ping Liang, Zhi-Mei Li, Jian-Ding Qiu
We propose a ratiometric electrochemical assay for detecting microRNA (miRNA) on the basis of dual-amplification mechanism by using distinguishable electrochemical signals from thionine (Thi) and ferrocene (Fc). The thiol-modified and ferrocene-labeled hairpin capture probes (CP) are first immobilized on an Au electrode via Au-S reaction. The target miRNA hybridizes with CP and unfolding the hairpin structure of CP to form miRNA-DNA duplexes. Then, kamchatka crab duplex specific nuclease (DSN) specifically cleaves the DNA in miRNA-DNA duplexes, leading to the release of miRNA and another cleaves cycle, meanwhile, numerous Fc leaves away from the electrode surface and leads to the signal-off of Fc...
November 8, 2017: Biosensors & Bioelectronics
https://www.readbyqxmd.com/read/29144417/fast-low-cost-and-non-destructive-physico-chemical-analysis-of-virgin-olive-oils-using-near-infrared-reflectance-spectroscopy
#5
Ana Garrido-Varo, María-Teresa Sánchez, María-José De la Haba, Irina Torres, Dolores Pérez-Marín
Near-Infrared (NIR) Spectroscopy was used for the non-destructive assessment of physico-chemical quality parameters in olive oil. At the same time, the influence of the sample presentation mode (spinning versus static cup) was evaluated using two spectrophotometers with similar optical characteristics. A total of 478 olive oil samples were used to develop calibration models, testing various spectral signal pre-treatments. The models obtained by applying MPLS regression to spectroscopic data yielded promising results for olive oil quality measurements, particularly for acidity, the peroxide index and alkyl and ethyl ester content...
November 16, 2017: Sensors
https://www.readbyqxmd.com/read/29144402/characterization-of-non-derivatized-cellulose-samples-by-size-exclusion-chromatography-in-tetrabutylammonium-fluoride-dimethylsulfoxide-tbaf-dmso
#6
Jérémy Rebière, Antoine Rouilly, Vanessa Durrieu, Frédéric Violleau
This paper deals with the use of tetrabutylammonium fluoride/dimethylsulfoxide (TBAF/DMSO) to characterize the molar mass distribution of non-derivatized cellulosic samples by size exclusion chromatography (SEC). Different cellulose samples with various average degree of polymerization (DP) were first solubilized in this solvent system, with increasing TBAF rates, and then analyzed by SEC coupled to a refractive index detector (RID), using DMSO as mobile phase. The Molar Masses (MM) obtained by conventional calibration were then discussed and compared with suppliers' data and MM determined by viscosimetry measurements...
November 16, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29144197/evaluation-of-umelisa-%C3%A2-t4-neonatal-and-umelisa-%C3%A2-t4-using-polystyrene-plates-coated-with-anti-thyroxine-t4-monoclonal-antibodies
#7
Elisa M Castells, Ernesto C González, Pedro L Pérez, Lesley Del Río, Yileidis Tejeda, Yenitse Perea, Odalys Martín, Maryeris Espinosa, Jose A Rivero, Amarilys Frómeta
Congenital hypothyroidism is one of the most common preventable causes of mental retardation. The Center of Immunoassay has developed the UMELISA(®) T4 NEONATAL and UMELISA(®) T4 to determine neonatal T4 levels in dried blood and serum samples. Both reagent kits use the same polystyrene plates coated with anti- thyroxine (T4) polyclonal antibodies as solid phase. This work shows the re-standardization of the UMELISA(®) T4 NEONATAL and UMELISA(®) T4 using plates coated with anti-T4 monoclonal antibodies (T4Mabs)...
November 16, 2017: Journal of Immunoassay & Immunochemistry
https://www.readbyqxmd.com/read/29144124/ionic-liquid-microstrips-impregnated-with-magnetic-nano-stirrers-for-sensitive-gas-sensors
#8
Richard Gondosiswanto, David Brynn Hibbert, Yu Fang, Chuan Zhao
Ionic liquids have been regarded as promising electrolytes as substitutes for volatile aqueous or organic solvents for electrochemical gas sensors. However ionic liquids are viscous and the slow diffusion of gas molecules leads to poor sensitivity and sluggish response times. Herein, we describe a strategy using an array of microstrips of ionic liquid containing magnetic nanoparticles as nano-stirrers for enhanced mass transport and gas sensing. Magnetic CoFe2O4 nanoparticles are synthesized and dispersed in a hydrophobic ionic liquid [BMP][Ntf2]...
November 16, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29143972/determination-of-tubuloside-b-by-lc-ms-ms-and-its-application-to-a-pharmacokinetic-study-in-rats
#9
Shenbao Yang, Ruiying Qu, Peilu Sun, Shan Xiong, Siyi Yan, Zhipeng Deng
Tubuloside B, a novel neuroprotective phenylethanoid, is a major active constituent of Cistanche tubulosa and Cistanche deserticola. A specific and sensitive liquid chromatography tandem mass spectrometry (LC-MS/MS) method has been developed and validated for the quantification of tubuloside B in rat plasma. Sample preparation was conducted through a protein-precipitation extraction with methanol using tubuloside A as internal standard (IS). Chromatographic separation was achieved by using a Capcell Pak C18 column (2...
November 16, 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/29143775/low-cost-air-quality-monitoring-tools-from-research-to-practice-a-workshop-summary
#10
REVIEW
Andrea L Clements, William G Griswold, Abhijit Rs, Jill E Johnston, Megan M Herting, Jacob Thorson, Ashley Collier-Oxandale, Michael Hannigan
In May 2017, a two-day workshop was held in Los Angeles (California, U.S.A.) to gather practitioners who work with low-cost sensors used to make air quality measurements. The community of practice included individuals from academia, industry, non-profit groups, community-based organizations, and regulatory agencies. The group gathered to share knowledge developed from a variety of pilot projects in hopes of advancing the collective knowledge about how best to use low-cost air quality sensors. Panel discussion topics included: (1) best practices for deployment and calibration of low-cost sensor systems, (2) data standardization efforts and database design, (3) advances in sensor calibration, data management, and data analysis and visualization, and (4) lessons learned from research/community partnerships to encourage purposeful use of sensors and create change/action...
October 28, 2017: Sensors
https://www.readbyqxmd.com/read/29142392/quantitative-analysis-of-benzyl-isothiocyanate-in-salvadora-persica-extract-and-dental-care-herbal-formulations-using-reversed-phase-c18-high-performance-liquid-chromatography-method
#11
Maged Saad Abdel-Kader, Y T Kamal, Prawez Alam, Mohammed Hamed Alqarni, Ahmed Ibrahim Foudah
Context: Benzyl isothiocyanate is the active antimicrobial agent in Salvadora persica (siwak) widely used in Islamic countries for oral hygiene. Aims: Quantification of benzyl isothiocyanate in the ethanol extract of S. persica and some dental care herbal formulations labeled to contain siwak. Settings and Design: Simple and sensitive high-performance liquid chromatography method was designed. Subjects and Methods: Separation was achieved on reverse phase C18 (250 mm × 4...
October 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/29142014/model-predictions-of-deformation-embolization-and-permeability-of-partially-obstructive-blood-clots-under-variable-shear-flow
#12
Shixin Xu, Zhiliang Xu, Oleg V Kim, Rustem I Litvinov, John W Weisel, Mark Alber
Thromboembolism, one of the leading causes of morbidity and mortality worldwide, is characterized by formation of obstructive intravascular clots (thrombi) and their mechanical breakage (embolization). A novel two-dimensional multi-phase computational model is introduced that describes active interactions between the main components of the clot, including platelets and fibrin, to study the impact of various physiologically relevant blood shear flow conditions on deformation and embolization of a partially obstructive clot with variable permeability...
November 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29141916/bone-age-a-handy-tool-for-pediatric-providers
#13
REVIEW
Ana L Creo, W Frederick Schwenk
Pediatricians have relied on methods for determining skeletal maturation for >75 years. Bone age continues to be a valuable tool in assessing children's health. New technology for bone age determination includes computer-automated readings and assessments obtained from alternative imaging modalities. In addition, new nonclinical bone age applications are evolving, particularly pertaining to immigration and children's rights to asylum. Given the significant implications when bone ages are used in high-stake decisions, it is necessary to recognize recently described limitations in predicting accurate age in various ethnicities and diseases...
November 15, 2017: Pediatrics
https://www.readbyqxmd.com/read/29141711/application-of-gas-chromatography-coupled-to-quadrupole-orbitrap-mass-spectrometry-for-pesticide-residue-analysis-in-cereals-and-feed-ingredients
#14
Marc Tienstra, Hans G J Mol
A method for residue analysis of pesticides and polychlorinated biphenyls in cereals and feed ingredients based on QuEChERS extraction, programmed temperature vaporizer large-volume injection, and GC with electron ionization (EI) quadrupole Orbitrap full-scan high-resolution MS (60 000 full width at half-maximum at m/z 200) has been developed. In addition to full-scan acquisition, simultaneous full-scan and selected-ion monitoring acquisition was used to improve detectability in incidental cases in which analytes coeluted with intense signals from coextractants...
November 16, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29141489/non-linear-conversion-of-hx4-uptake-for-automatic-segmentation-of-hypoxic-volumes-and-dose-prescription
#15
Ana Ureba, Emely Lindblom, Alexandru Dasu, Johan Uhrdin, Aniek J G Even, Wouter van Elmpt, Philippe Lambin, Peter Wersäll, Iuliana Toma-Dasu
BACKGROUND: Tumour hypoxia is associated with increased radioresistance and poor response to radiotherapy. Pre-treatment assessment of tumour oxygenation could therefore give the possibility to tailor the treatment by calculating the required boost dose needed to overcome the increased radioresistance in hypoxic tumours. This study concerned the derivation of a non-linear conversion function between the uptake of the hypoxia-PET tracer (18)F-HX4 and oxygen partial pressure (pO2). MATERIAL AND METHODS: Building on previous experience with FMISO including experimental data on tracer uptake and pO2, tracer-specific model parameters were derived for converting the normalised HX4-uptake at the optimal imaging time point to pO2...
November 16, 2017: Acta Oncologica
https://www.readbyqxmd.com/read/29141396/proposal-of-a-pretreatment-nomogram-for-predicting-local-recurrence-after-intensity-modulated-radiation-therapy-in-t4-nasopharyngeal-carcinoma-a-retrospective-review-of-415-chinese-patients
#16
Lu-Lu Zhang, Yi-Yang Li, Jiang Hu, Guan-Qun Zhou, Lei Chen, Wen-Fei Li, Ai-Hua Lin, Jun Ma, Zhen-Yu Qi, Ying Sun
Purpose: Local relapse-free survival (LRFS) differs widely among patients with T4 category nasopharyngeal carcinoma (NPC). We aimed to build a nomogram incorporating clinicopathological information to predict LRFS in T4 NPC after definitive intensity-modulated radiation therapy (IMRT). Methods and Materials: Retrospective study of 415 Chinese patients with non-metastatic T4 NPC treated with definitive IMRT with or without chemotherapy at our cancer center between October 2009 and September 2013...
November 15, 2017: Cancer Research and Treatment: Official Journal of Korean Cancer Association
https://www.readbyqxmd.com/read/29141332/-reliability-and-validity-of-driving-anger-scale-in-professional-drivers-in-china
#17
Z Li, Y M Yang, C Zhang, Y Li, J Hu, L W Gao, Y X Zhou, X J Zhang
Objective: To assess the reliability and validity of the Chinese version of Driving Anger Scale (DAS) in professional drivers in China and provide a scientific basis for the application of the scale in drivers in China. Methods: Professional drivers, including taxi drivers, bus drivers, truck drivers and school bus drivers, were selected to complete the questionnaire. Cronbach's α and split-half reliability were calculated to evaluate the reliability of DAS, and content, contract, discriminant and convergent validity were performed to measure the validity of the scale...
November 10, 2017: Zhonghua Liu Xing Bing Xue za Zhi, Zhonghua Liuxingbingxue Zazhi
https://www.readbyqxmd.com/read/29141153/using-observational-data-to-calibrate-simulation-models
#18
Eleanor J Murray, James M Robins, George R Seage, Sara Lodi, Emily P Hyle, Krishna P Reddy, Kenneth A Freedberg, Miguel A Hernán
BACKGROUND: Individual-level simulation models are valuable tools for comparing the impact of clinical or public health interventions on population health and cost outcomes over time. However, a key challenge is ensuring that outcome estimates correctly reflect real-world impacts. Calibration to targets obtained from randomized trials may be insufficient if trials do not exist for populations, time periods, or interventions of interest. Observational data can provide a wider range of calibration targets but requires methods to adjust for treatment-confounder feedback...
November 1, 2017: Medical Decision Making: An International Journal of the Society for Medical Decision Making
https://www.readbyqxmd.com/read/29141146/the-effect-of-pressure-and-temperature-on-mid-infrared-sensing-of-dissolved-hydrocarbons-in-water
#19
Charles Heath, Matthew B Myers, Bobby Pejcic
Attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopy using a polymer coated internal reflection element/waveguide is an established sensor platform for the detection of a range of organic and hydrocarbon molecules dissolved in water. The polymer coating serves two purposes: to concentrate hydrocarbons from the aqueous phase and to exclude water along with other interfering molecules from the surface of the internal reflection element. Crucial to reliable quantification and analytical performance is the calibration of the ATR-FTIR sensor which is commonly performed in water under mild ambient conditions (i...
November 15, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/29140990/cultivar-architecture-modulates-spore-dispersal-by-rain-splash-a-new-perspective-to-reduce-disease-progression-in-cultivar-mixtures
#20
Tiphaine Vidal, Pauline Lusley, Marc Leconte, Claude de Vallavieille-Pope, Laurent Huber, Sébastien Saint-Jean
Cultivar mixtures can be used to improve the sustainability of disease management within farming systems by growing cultivars that differ in their disease resistance level in the same field. The impact of canopy aerial architecture on rain-splash dispersal could amplify disease reduction within mixtures. We designed a controlled conditions experiment to study single splash-dispersal events and their consequences for disease. We quantified this impact through the spore interception capacities of the component cultivars of a mixture...
2017: PloS One
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