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https://www.readbyqxmd.com/read/28092868/a-practical-evaluation-of-measurement-uncertainty-in-gamma-ray-efficiency-curve-determination-through-an-analytical-approach
#1
Katsuhiro Shirono, Yasuhiro Unno, Rio Furukawa, Chushiro Yonezawa
An example of uncertainty evaluation of an efficiency curve is reported. In the applied method, the efficiency curve is determined through the weighted least square method based on measured efficiencies employing a mixed-radionuclide standard source. The variance-covariance matrix of the efficiencies is determined by evaluating the uncertainties of the counting, the calibrated radioactivities, the correction factors for true coincidence summing, and the inadequacy of the fitting function. The proposed method can be a basis to develop a more general procedure...
December 15, 2016: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28092780/standardization-of-106-ru-rh-by-live-timed-anticoincidence-counting-and-gamma-emission-determination
#2
C J da Silva, E A Rezende, R Poledna, L Tauhata, A Iwahara, R T Lopes
The absolute activity standardization measurement system of radionuclide by live-timed anticoincidence counting was implemented at LNMRI in 2008 to reduce the effects of some correction factors on the determination of activity with coincidence counting technique used for decades in the laboratory, for example, the corrections of dead time and resolution. With the live-timed anticoincidence system, the variety of radionuclides that can be calibrated by LNMRI was increased in relation to the type of decay. The objective of this study was to standardize the (106)Ru activity, determine gamma emission probabilities by spectrometric method for some energies, and estimate measurement uncertainties...
January 12, 2017: Applied Radiation and Isotopes
https://www.readbyqxmd.com/read/28092630/comparative-monte-carlo-study-on-the-performance-of-integration-and-list-mode-detector-configurations-for-carbon-ion-computed-tomography
#3
Sebastian Meyer, Chiara Gianoli, Lorena Magallanes, Benedikt Kopp, Thomas Tessonnier, Guillaume Landry, George Dedes, Bernd Voss, Katia Parodi
Ion beam therapy offers the possibility of a highly conformal tumor-dose distribution; however, this technique is extremely sensitive to inaccuracies in the treatment procedures. Ambiguities in the conversion of Hounsfield units of the treatment planning x-ray CT to relative stopping power (RSP) can cause uncertainties in the estimated ion range of up to several millimeters. Ion CT (iCT) represents a favorable solution allowing to directly assess the RSP. In this simulation study we investigate the performance of the integration-mode configuration for carbon iCT, in comparison with a single-particle approach under the same set-up...
February 7, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28092609/horse-expert-an-aided-expert-system-for-diagnosing-horse-diseases
#4
H Qin, J Xiao, X Gao, H Wang
In contrast to the rapid development of the horse husbandry in China, the ability of horse veterinarians to diagnose diseases has not been improved and only a few domain experts have considerable expertise. At present, many expert systems have been developed for diseases diagnosis, but few for horse diseases diagnosis have been studied in depth. This paper presents the design and development of a computer-aided expert system for diagnosing horse diseases. We suggest an approach for diagnosis of horse diseases based on the analysis of diagnostic characteristics and the experiential knowledge of domain experts...
December 1, 2016: Polish Journal of Veterinary Sciences
https://www.readbyqxmd.com/read/28092593/robust-estimation-of-arx-models-with-time-varying-time-delays-using-variational-bayesian-approach
#5
Yujia Zhao, Alireza Fatehi, Biao Huang
This paper is concerned with robust identification of processes with time-varying time delays. In reality, the delay values do not simply change randomly, but there is a correlation between consecutive delays. In this paper, the correlation of time delay is modeled by the transition probability of a Markov chain. Furthermore, the measured data are often contaminated by outliers, and therefore, t-distribution is adopted to model the measurement noise. The variational Bayesian (VB) approach is applied to estimate the model parameters along with time delays...
January 10, 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28092586/consensus-problem-over-high-order-multiagent-systems-with-uncertain-nonlinearities-under-deterministic-and-stochastic-topologies
#6
Hamed Rezaee, Farzaneh Abdollahi
The leaderless consensus problem over a class of high-order nonlinear multiagent systems (MASs) is studied. A robust protocol is proposed which guarantees achieving consensus in the network in the presences of uncertainties in agents models. Achieving consensus in the case of stochastic links failure is studied as well. Based on the concept super-martingales, it is shown that if the probability of the network connectivity is not zero, under some conditions, achieving almost sure consensus in the network can be guaranteed...
December 6, 2016: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28092540/robust-and-discriminative-labeling-for-multi-label-active-learning-based-on-maximum-correntropy-criterion
#7
Bo Du, Zengmao Wang, Lefei Zhang, Liangpei Zhang, Dacheng Tao
Multi-label learning draws great interests in many real world applications. It is a highly costly task to assign many labels by the oracle for one instance. Meanwhile, it is also hard to build a good model without diagnosing discriminative labels. Can we reduce the label costs and improve the ability to train a good model for multi-label learning simultaneously? Active learning addresses the less training samples problem by querying the most valuable samples to achieve a better performance with little costs...
January 10, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28092498/adaptive-fuzzy-output-feedback-control-for-switched-nonlinear-systems-with-unmodeled-dynamics
#8
Shaocheng Tong, Yongming Li
This paper investigates a robust adaptive fuzzy control stabilization problem for a class of uncertain nonlinear systems with arbitrary switching signals that use an observer-based output feedback scheme. The considered switched nonlinear systems possess the unstructured uncertainties, unmodeled dynamics, and without requiring the states being available for measurement. A state observer which is independent of switching signals is designed to solve the problem of unmeasured states. Fuzzy logic systems are used to identify unknown lumped nonlinear functions so that the problem of unstructured uncertainties can be solved...
February 2017: IEEE Transactions on Cybernetics
https://www.readbyqxmd.com/read/28092230/octamethylcyclotetrasiloxane-d4
#9
(no author information available yet)
Octamethylcyclotetrasiloxane (D4; CAS No. 556-67-2) is used as a monomer in the manufacture of polymeric materials, which are widely used in various industrial and/or medical applications, such as breast implants. D4 has a relatively low order of toxicity following acute administration via the oral, dermal, and inhalation routes of exposure and is not considered to be a dermal or eye irritant or to be a dermal sensitizer. There is no appreciable dermal absorption of D4 based on results from in vivo and in vitro studies...
January 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28092229/decamethylcyclopentasiloxane-d5
#10
(no author information available yet)
Decamethylcyclopentasiloxane (D5; CAS No. 541-02-6) is a precursor in the production of siloxane polymers for industry and medicine and is a carrier ingredient in many toiletries and cosmetics. D5 has a relatively low order of toxicity following acute administration via the oral, dermal, and inhalation routes of exposure. It is not considered to be a dermal or eye irritant or a dermal sensitizer. There is no appreciable dermal absorption of D5 based on results from in vivo and in vitro studies. It has not been shown to be genotoxic/mutagenic when tested in a number of short-term in vitro and in vivo assays and did not cause reproductive or developmental toxicity in rats...
January 2017: Toxicology and Industrial Health
https://www.readbyqxmd.com/read/28091724/automatic-ct-based-finite-element-model-generation-for-temperature-based-death-time-estimation-feasibility-study-and-sensitivity-analysis
#11
Sebastian Schenkl, Holger Muggenthaler, Michael Hubig, Bodo Erdmann, Martin Weiser, Stefan Zachow, Andreas Heinrich, Felix Victor Güttler, Ulf Teichgräber, Gita Mall
Temperature-based death time estimation is based either on simple phenomenological models of corpse cooling or on detailed physical heat transfer models. The latter are much more complex but allow a higher accuracy of death time estimation, as in principle, all relevant cooling mechanisms can be taken into account.Here, a complete workflow for finite element-based cooling simulation is presented. The following steps are demonstrated on a CT phantom: Computer tomography (CT) scan Segmentation of the CT images for thermodynamically relevant features of individual geometries and compilation in a geometric computer-aided design (CAD) model Conversion of the segmentation result into a finite element (FE) simulation model Computation of the model cooling curve (MOD) Calculation of the cooling time (CTE) For the first time in FE-based cooling time estimation, the steps from the CT image over segmentation to FE model generation are performed semi-automatically...
January 14, 2017: International Journal of Legal Medicine
https://www.readbyqxmd.com/read/28091679/sustainability-of-renewable-fuel-infrastructure-a-screening-lca-case-study-of-anticorrosive-graphene-oxide-epoxy-liners-in-steel-tanks-for-the-storage-of-biodiesel-and-its-blends
#12
Govinda Chilkoor, Venkata K K Upadhyayula, Venkataramana Gadhamshetty, Nikhil Koratkar, Mats Tysklind
Biodiesel is a widely used fuel that meets the renewable fuel standards developed under the Energy Policy Act of 2005. However, biodiesel is known to pose a series of abiotic and biotic corrosion risks to storage tanks. A typical practice (incumbent system) used to protect the tanks from these risks include (i) coating the interior surface of the tank with a solvent-free epoxy (SFE) liner, and (ii) adding a biocide to the tank. Herein, we present a screening-level life-cycle assessment study to compare the environmental performance of a graphene oxide (GO)-epoxy (GOE) liner with the incumbent system...
January 16, 2017: Environmental Science. Processes & Impacts
https://www.readbyqxmd.com/read/28091665/trace-element-protein-interactions-in-endolymph-from-the-inner-ear-of-fish-implications-for-environmental-reconstructions-using-fish-otolith-chemistry
#13
Oliver R B Thomas, Katherine Ganio, Blaine R Roberts, Stephen E Swearer
Otoliths, the biomineralised hearing "ear stones" from the inner ear of fish, grow throughout the lifespan of an individual, with deposition of alternating calciferous and proteinaceous bands occurring daily. Trace element : calcium ratios within daily increments measured by laser ablation-inductively coupled plasma-mass spectrometry (LA-ICP-MS) are often used in fisheries science to reconstruct environmental histories. There is, however, considerable uncertainty as to which elements are interacting with either the proteinaceous or calciferous zones of the otolith, and thus their utility as indicators of environmental change...
January 16, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28091534/fisheries-portfolio-diversification-and-turnover-buffer-alaskan-fishing-communities-from-abrupt-resource-and-market-changes
#14
Timothy J Cline, Daniel E Schindler, Ray Hilborn
Abrupt shifts in natural resources and their markets are a ubiquitous challenge to human communities. Building resilient social-ecological systems requires approaches that are robust to uncertainty and to regime shifts. Harvesting diverse portfolios of natural resources and adapting portfolios in response to change could stabilize economies reliant on natural resources and their markets, both of which are prone to unpredictable shifts. Here we use fisheries catch and revenue data from Alaskan fishing communities over 34 years to test whether diversification and turnover in the composition of fishing opportunities increased economic stability during major ocean and market regime shifts in 1989...
January 16, 2017: Nature Communications
https://www.readbyqxmd.com/read/28091429/chronic-kidney-disease-in-chinese-postmenopausal-women-a-cross-sectional-survey
#15
F Pei, Z Zhou, Y Li, Y Ren, X Yang, G Liu, Q Xia, Z Hu, L Zhang, M Zhao, H Wang
INTRODUCTION: Despite advances in the management of chronic kidney disease (CKD), there is ongoing uncertainty regarding the prevalence of CKD in postmenopausal women. This study was designed to investigate both CKD prevalence and related risk factors in a cohort of postmenopausal Chinese women. MATERIALS AND METHODS: A cross-sectional survey was administered to a nationally representative sample of female Chinese participants, including a total of 47,204 subjects, among whom were 8573 self-reported postmenopausal women...
February 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28091395/a-novel-onset-detection-technique-for-brain-computer-interfaces-using-sound-production-related-cognitive-tasks-in-simulated-online-system
#16
YoungJae Song, Francisco Sepulveda
OBJECTIVE: Self-paced EEG-based BCIs (SP-BCIs) have traditionally been avoided due to two sources of uncertainty: (1) precisely when an intentional command is sent by the brain, i.e., the command onset detection problem, and (2) how different the intentional command is when compared to non-specific (or idle) states. Performance evaluation is also a problem and there are no suitable standard metrics available. In this paper we attempted to tackle these issues. APPROACH: Self-paced covert sound-production cognitive tasks (i...
February 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28091358/a-survey-of-exercise-advice-and-recommendations-in-united-kingdom-paediatric-cardiac-clinics
#17
Craig A Williams, Lucy Gowing, Richard Horn, Alan Graham Stuart
BACKGROUND: Physical activity and exercise have important health benefits for children and adolescents with CHD. The objective of this study was to survey the provision of advice and recommendations in United Kingdom paediatric CHD clinics. METHODS: A three-page questionnaire was sent out to paediatric cardiac consultants in the United Kingdom, paediatric consultants with expertise in cardiology, and nursing staff (Paediatricians with Expertise in Cardiology Special Interest Group), as well as all members of the British Congenital Cardiovascular Association...
January 16, 2017: Cardiology in the Young
https://www.readbyqxmd.com/read/28090655/30-second-bound-and-pore-water-concentration-mapping-of-cortical-bone-using-2d-ute-with-optimized-half-pulses
#18
Mary Kate Manhard, Kevin D Harkins, Daniel F Gochberg, Jeffry S Nyman, Mark D Does
PURPOSE: MRI of cortical bone has the potential to offer new information about fracture risk. Current methods are typically performed with 3D acquisitions, which suffer from long scan times and are generally limited to extremities. This work proposes using 2D UTE with half pulses for quantitatively mapping bound and pore water in cortical bone. METHODS: Half-pulse 2D UTE methods were implemented on a 3T Philips Achieva scanner using an optimized slice-select gradient waveform, with preparation pulses to selectively image bound or pore water...
January 16, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28090247/optimal-parameter-map-estimation-for-shape-representation-a-generative-approach
#19
Shireen Y Elhabian, Praful Agrawal, Ross T Whitaker
Probabilistic label maps are a useful tool for important medical image analysis tasks such as segmentation, shape analysis, and atlas building. Existing methods typically rely on blurred signed distance maps or smoothed label maps to model uncertainties and shape variabilities, which do not conform to any generative model or estimation process, and are therefore suboptimal. In this paper, we propose to learn probabilistic label maps using a generative model on given set of binary label maps. The proposed approach generalizes well on unseen data while simultaneously capturing the variability in the training samples...
April 2016: Proceedings of the IEEE International Symposium on Biomedical Imaging: from Nano to Macro
https://www.readbyqxmd.com/read/28090226/more-use-of-peritoneal-dialysis-gives-significant-savings-a-systematic-review-and-health-economic-decision-model
#20
Eva Pike, Vida Hamidi, Tove Ringerike, Torbjorn Wisloff, Marianne Klemp
BACKGROUND: Patients with end-stage renal disease (ESRD) are in need of renal replacement therapy as dialysis and/or transplantation. The prevalence of ESRD and, thus, the need for dialysis are constantly growing. The dialysis modalities are either peritoneal performed at home or hemodialysis (HD) performed in-center (hospital or satellite) or home. We examined effectiveness and cost-effectiveness of HD performed at different locations (hospital, satellite, and home) and peritoneal dialysis (PD) at home in the Norwegian setting...
February 2017: Journal of Clinical Medicine Research
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