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https://www.readbyqxmd.com/read/28728059/iterative-variational-mode-decomposition-based-automated-detection-of-glaucoma-using-fundus-images
#1
Shishir Maheshwari, Ram Bilas Pachori, Vivek Kanhangad, Sulatha V Bhandary, U Rajendra Acharya
Glaucoma is one of the leading causes of permanent vision loss. It is an ocular disorder caused by increased fluid pressure within the eye. The clinical methods available for the diagnosis of glaucoma require skilled supervision. They are manual, time consuming, and out of reach of common people. Hence, there is a need for an automated glaucoma diagnosis system for mass screening. In this paper, we present a novel method for an automated diagnosis of glaucoma using digital fundus images. Variational mode decomposition (VMD) method is used in an iterative manner for image decomposition...
June 19, 2017: Computers in Biology and Medicine
https://www.readbyqxmd.com/read/28727757/development-of-organic-fertilizers-from-food-market-waste-and-urban-gardening-by-composting-in-ecuador
#2
J Jara-Samaniego, M D Pérez-Murcia, M A Bustamante, C Paredes, A Pérez-Espinosa, I Gavilanes-Terán, M López, F C Marhuenda-Egea, H Brito, R Moral
Currently, the management of urban waste streams in developing countries is not optimized yet, and in many cases these wastes are disposed untreated in open dumps. This fact causes serious environmental and health problems due to the presence of contaminants and pathogens. Frequently, the use of specific low-cost strategies reduces the total amount of wastes. These strategies are mainly associated to the identification, separate collection and composting of specific organic waste streams, such as vegetable and fruit refuses from food markets and urban gardening activities...
2017: PloS One
https://www.readbyqxmd.com/read/28727548/mr-ntd-manifold-regularization-nonnegative-tucker-decomposition-for-tensor-data-dimension-reduction-and-representation
#3
Xutao Li, Michael K Ng, Gao Cong, Yunming Ye, Qingyao Wu
With the advancement of data acquisition techniques, tensor (multidimensional data) objects are increasingly accumulated and generated, for example, multichannel electroencephalographies, multiview images, and videos. In these applications, the tensor objects are usually nonnegative, since the physical signals are recorded. As the dimensionality of tensor objects is often very high, a dimension reduction technique becomes an important research topic of tensor data. From the perspective of geometry, high-dimensional objects often reside in a low-dimensional submanifold of the ambient space...
August 2017: IEEE Transactions on Neural Networks and Learning Systems
https://www.readbyqxmd.com/read/28727443/plasmonic-thermal-decomposition-digestion-of-proteins-a-rapid-on-surface-protein-digestion-technique-for-mass-spectrometry-imaging
#4
Rong Zhou, Franco Basile
A method based on plasmon surface resonance absorption and heating was developed to perform a rapid on-surface protein thermal decomposition and digestion suitable for imaging MS and/or profiling. This photo-thermal process or plasmonic thermal decomposition/digestion (plasmonic-TDD) method incorporates a continuous wave (CW) laser excitation and gold nanoparticles (Au-NPs) to induce known thermal decomposition reactions that cleave peptides and proteins specifically at the C-terminus of aspartic acid and at the N-terminus of cysteine...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28726875/time-resolved-spectroscopic-analysis-of-the-light-energy-harvesting-mechanism-in-carbazole-dendrimers-with-a-blue-phosphorescent-ir-complex-core
#5
Yang-Jin Cho, So-Yoen Kim, Mi Rang Son, Ho-Jin Son, Dae Won Cho, Sang Ook Kang
In order to investigate the light-energy harvesting mechanism, a series of dendrimers with a heteroleptic iridium(iii) complex core, [Ir(dmb)2(pic-Czn)] (Gn: n = 1, 2, and 3), with 2,6-difluoro-3-(4-methylpyridin-2-yl)benzonitrile (dmb) as the cyclometallating ligand and 3-hydroxypicolinate (pic) as the ancillary ligand, connected to carbazole-based dendrons (Czn: n = 2, 4, and 8) was synthesized. The Ir centred complex [Ir(dmb)2(pic-OCH3), G0] shows a blue emission at <500 nm, which is assigned to metal-to-ligand charge-transfer ((3)MLCT) phosphorescence...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28726873/local-decomposition-of-imaginary-polarizabilities-and-dispersion-coefficients
#6
Ignat Harczuk, Balazs Nagy, Frank Jensen, Olav Vahtras, Hans Ågren
We present a new way to compute the two-body contribution to the dispersion energy using ab initio theory. By combining the complex polarization propagator method and the LoProp transformation, local contributions to the Casimir-Polder interaction is obtained. The full dispersion energy in dimer systems consisting of pairs of molecules including H2, N2, CO, CH4, pyridine, and benzene is investigated, where anisotropic as well as isotropic models of dispersion are obtained using a decomposition scheme for the dipole-dipole polarizability...
July 20, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28726754/identification-of-load-categories-in-rotor-system-based-on-vibration-analysis
#7
Kun Zhang, Zhaojian Yang
Rotating machinery is often subjected to variable loads during operation. Thus, monitoring and identifying different load types is important. Here, five typical load types have been qualitatively studied for a rotor system. A novel load category identification method for rotor system based on vibration signals is proposed. This method is a combination of ensemble empirical mode decomposition (EEMD), energy feature extraction, and back propagation (BP) neural network. A dedicated load identification test bench for rotor system was developed...
July 20, 2017: Sensors
https://www.readbyqxmd.com/read/28726669/spectral-performance-of-a-whole-body-research-photon-counting-detector-ct-quantitative-accuracy-in-derived-image-sets
#8
Shuai Leng, Wei Zhou, Zhicong Yu, Ahmed F Halaweish, Bernhard Krauss, Bernhard Schmidt, Lifeng Yu, Steffen Kappler, Cynthia H McCollough
Photon-counting computed tomography (PCCT) uses a photon counting detector to count individual photons and allocate them to specific energy bins by comparing photon energy to preset thresholds. This enables simultaneous multi-energy CT with a single source and detector. Phantom studies were performed to assess the spectral performance of a research PCCT scanner by assessing the accuracy of derived images sets. Specifically, we assessed the accuracy of iodine quantification in iodine map images and of CT number accuracy in virtual monoenergetic images (VMI)...
July 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28726444/local-fit-evaluation-of-structural-equation-models-using-graphical-criteria
#9
Felix Thoemmes, Yves Rosseel, Johannes Textor
Evaluation of model fit is critically important for every structural equation model (SEM), and sophisticated methods have been developed for this task. Among them are the χ2 goodness-of-fit test, decomposition of the χ2, derived measures like the popular root mean square error of approximation (RMSEA) or comparative fit index (CFI), or inspection of residuals or modification indices. Many of these methods provide a global approach to model fit evaluation: A single index is computed that quantifies the fit of the entire SEM to the data...
July 20, 2017: Psychological Methods
https://www.readbyqxmd.com/read/28726380/assessment-of-the-stability-and-operability-of-cobalt-phosphide-electrocatalyst-for-hydrogen-evolution
#10
Hyun S Ahn, Allen J Bard
Transition metal phosphides have been investigated heavily as hydrogen evolution reaction (HER) catalysts. One of the most active transition metal phosphides, CoP, has been tested for its stability and operability under mild conditions that it may be exposed to in its applications (photoelectrochemistry and artificial photosynthesis). Surface-interrogation scanning electrochemical microscopy (SI-SECM) revealed that CoP HER catalyst is vulnerable to oxidation (by oxygen and chemical oxidants). The degradation mechanism was shown to be surface oxidation by dioxygen, followed by acid etching of the oxidized layer...
July 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28726301/a-rapid-3d-fat-water-decomposition-method-using-globally-optimal-surface-estimation-r-goose
#11
Chen Cui, Abhay Shah, Xiaodong Wu, Mathews Jacob
PURPOSE: To improve the graph model of our previous work GOOSE for fat-water decomposition with higher computational efficiency and quantitative accuracy. METHODS: A modification of the GOOSE fat water decomposition algorithm is introduced while the global convergence guarantees of GOOSE are still inherited to minimize fat-water swaps and phase wraps. In this paper, two non-equidistant graph optimization frameworks are proposed as a single-step framework termed as rapid GOOSE (R-GOOSE), and a multi-step framework termed as multi-scale R-GOOSE (mR-GOOSE)...
July 20, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28726128/on-the-response-of-the-baltic-proper-to-changes-of-the-total-phosphorus-supply
#12
Anders Stigebrandt
Using a time-dependent phosphorus (P) budget model for the Baltic proper, describing sources and sinks at the external borders of the water column, one may compute the e-folding time T of the adjustment of the winter surface water P concentration c 1 to abruptly changed total P supply. The restoration time TR = 3T is introduced as a practical measure of the time it takes to achieve 95% of the change of c 1 towards the final, equilibrium, state c 1e. The P budget model, including an internal source emanating from deep anoxic bottoms, also shows that c 1e is proportional to the total P supply to the water column...
July 19, 2017: Ambio
https://www.readbyqxmd.com/read/28725645/imaging-bronchopulmonary-dysplasia-a-multimodality-update
#13
REVIEW
Thomas Semple, Mohammed R Akhtar, Catherine M Owens
Bronchopulmonary dysplasia is the most common form of infantile chronic lung disease and results in significant health-care expenditure. The roles of chest radiography and computed tomography (CT) are well documented but numerous recent advances in imaging technology have paved the way for newer imaging techniques including structural pulmonary assessment via lung magnetic resonance imaging (MRI), functional assessment via ventilation, and perfusion MRI and quantitative imaging techniques using both CT and MRI...
2017: Frontiers in Medicine
https://www.readbyqxmd.com/read/28725570/enzyme-activities-of-%C3%AE-glucosidase-in-japanese-neonates-with-pseudodeficiency-alleles
#14
Ryuichi Mashima, Torayuki Okuyama
Lysosomal storage disorders (LSDs) are caused by defective enzyme activities in lysosomes, characterized by the accumulation of sphingolipids, glycolipids, oligosaccharides, mucopolysaccharides, the oxidation products of cholesterol, and other biological substances. A growing number of clinical studies have suggested the enhanced efficacy of existing therapies, including enzyme replacement therapy, which is effective when it is initiated during the presymptomatic period. Thus, the identification of disease-affected individuals by newborn screening has been considered an effective platform...
September 2017: Molecular Genetics and Metabolism Reports
https://www.readbyqxmd.com/read/28724998/effect-of-defects-controlled-by-preparation-condition-and-heat-treatment-on-the-ferromagnetic-properties-of-few-layer-graphene
#15
Qinghua Miao, Lidong Wang, Zhaoyuan Liu, Bing Wei, Jinhui Wang, Xiangli Liu, Weidong Fei
Magnetism in graphene has stimulated extensive studies to search for novel metal-free magnetic device. In this paper, we use a synthesis method far from equilibrium state named self-propagating high temperature synthesis (SHS) to produce few-layer graphene with different defect contents and then use a heat treatment process (vacuum-annealing and air-cooling) to further control the defects in graphene. We find that the type and content of defects in graphene can be controlled by adjusting the mole ratio of reactants (Mg: CaCO3) for SHS reaction and the temperature of the subsequent heat treatment...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724392/a-prospective-study-assessing-agreement-and-reliability-of-a-geriatric-evaluation
#16
Isabella Locatelli, Stéfanie Monod, Jacques Cornuz, Christophe J Büla, Nicolas Senn
BACKGROUND: The present study takes place within a geriatric program, aiming at improving the diagnosis and management of geriatric syndromes in primary care. Within this program it was of prime importance to be able to rely on a robust and reproducible geriatric consultation to use as a gold standard for evaluating a primary care brief assessment tool. The specific objective of the present study was thus assessing the agreement and reliability of a comprehensive geriatric consultation...
July 19, 2017: BMC Geriatrics
https://www.readbyqxmd.com/read/28723117/versatile-barometer-biosensor-based-on-au-pt-core-shell-nanoparticle-probe
#17
Qiangqiang Fu, Ze Wu, Dan Du, Chengzhou Zhu, Yuehe Lin, Yong Tang
There is a high global demand for sensitive, portable, user-friendly, and cost-effective biosensors. In this work, we introduce a barometer-based biosensor for the detection of a broad range of targets. The device is operated by measuring the pressure change produced by oxygen (O2) generation in a limited chamber using a portable barometer. The design employs core-shell Au@Pt nanoparticles (Au@PtNPs) as the bioassay probe to catalyze the decomposition of H2O2 and the release of O2. As a proof of concept, we developed barometer-based immunosensors to detect carcinoembryonic antigen (CEA) and ractopamine (Rac)...
June 23, 2017: ACS Sensors
https://www.readbyqxmd.com/read/28723084/mineral-reactions-in-shale-gas-reservoirs-barite-scale-formation-from-reusing-produced-water-as-hydraulic-fracturing-fluid
#18
Amelia N Paukert Vankeuren, J Alexandra Hakala, Karl Jarvis, Johnathan E Moore
Hydraulic fracturing for gas production is now ubiquitous in shale plays, but relatively little is known about shale-hydraulic fracturing fluid (HFF) reactions within the reservoir. To investigate reactions during the shut-in period of hydraulic fracturing, experiments were conducted flowing different HFFs through fractured Marcellus Shale cores at reservoir temperature and pressure (66(o)C, 20 MPa) for one week. Results indicate HFFs with hydrochloric acid cause substantial dissolution of carbonate minerals, as expected, increasing effective fracture volume (fracture volume + near-fracture matrix porosity) by 56-65%...
July 19, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28722538/dispersed-synthesis-of-uniform-fe3o4-magnetic-nanoparticles-via-in-situ-decomposition-of-iron-precursor-along-cotton-fiber-for-sudan-dyes-analysis-in-food-samples
#19
Yassine Bentahir, Said Elmarhoum, Rachid Salghi, Manuel Algarra, Angel Ríos, Mohammed Zougagh
Fe3O4 magnetic nanoparticles, with a negative charge surface, are known to have efficient adsorbent properties, but they tend to be agglomerated into larger aggregates or flocs, which can cause loss of specific area. The addition of cotton fiber, as a stabilizer in preparation of the Fe3O4 nanoparticles, is able to efficiently reduce particle aggregation, and thus, effective particle size, resulting in much greater specific surface area and adsorption sites. Fe3O4 nanoparticles synthesis was accomplished by in-situ high temperature decomposition of the precursor ferric ion in the presence of cotton fiber and ethylene glycol solvent...
July 19, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
https://www.readbyqxmd.com/read/28722188/preventing-thin-film-dewetting-via-graphene-capping
#20
Peigen Cao, Peter Bai, Arash A Omrani, Yihan Xiao, Kacey L Meaker, Hsin-Zon Tsai, Aiming Yan, Han Sae Jung, Ramin Khajeh, Griffin F Rodgers, Youngkyou Kim, Andrew S Aikawa, Mattew A Kolaczkowski, Yi Liu, Alex Zettl, Ke Xu, Michael F Crommie, Ting Xu
A monolayer 2D capping layer with high Young's modulus is shown to be able to effectively suppress the dewetting of underlying thin films of small organic semiconductor molecule, polymer, and polycrystalline metal, respectively. To verify the universality of this capping layer approach, the dewetting experiments are performed for single-layer graphene transferred onto polystyrene (PS), semiconducting thienoazacoronene (EH-TAC), gold, and also MoS2 on PS. Thermodynamic modeling indicates that the exceptionally high Young's modulus and surface conformity of 2D capping layers such as graphene and MoS2 substantially suppress surface fluctuations and thus dewetting...
July 19, 2017: Advanced Materials
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