keyword
MENU ▼
Read by QxMD icon Read
search

singular

keyword
https://www.readbyqxmd.com/read/28813947/exploiting-kinematic-constraints-to-compensate-magnetic-disturbances-when-calculating-joint-angles-of-approximate-hinge-joints-from-orientation-estimates-of-inertial-sensors
#1
Daniel Laidig, Thomas Schauer, Thomas Seel
Inertial Measurement Units (IMUs) have become a widely used tool for rehabilitation and other application domains in which human motion is analyzed using an ambulatory or wearable setup. Since the magnetic field is inhomogeneous in indoor environments and in the proximity of ferromagnetic material, standard orientation estimation and joint angle calculation algorithms often lead to inaccurate or even completely wrong results. One approach to circumvent this is to exploit the kinematic constraint that is induced by mechanical hinge joints and also by approximate hinge joints such as the knee joint and the finger (interphalangeal) joints of the human body...
July 2017: IEEE ... International Conference on Rehabilitation Robotics: [proceedings]
https://www.readbyqxmd.com/read/28811562/loop-quantum-cosmology-and-singularities
#2
Ward Struyve
Loop quantum gravity is believed to eliminate singularities such as the big bang and big crunch singularity. This belief is based on studies of so-called loop quantum cosmology which concerns symmetry-reduced models of quantum gravity. In this paper, the problem of singularities is analysed in the context of the Bohmian formulation of loop quantum cosmology. In this formulation there is an actual metric in addition to the wave function, which evolves stochastically (rather than deterministically as the case of the particle evolution in non-relativistic Bohmian mechanics)...
August 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28809683/low-rank-latent-pattern-approximation-with-applications-to-robust-image-classification
#3
Shuo Chen, Jian Yang, Lei Luo, Yang Wei, Kaihua Zhang, Ying Tai
This paper develops a novel method to address the structural noise in samples for image classification. Recently, regression related classification methods have shown promising results when facing the pixel-wise noise. However, they become weak in coping with the structural noise due to ignoring of relationships between pixels of noise image. Meanwhile, most of them need to implement the iterative process for computing representation coefficients, which leads to the high time consumption. To overcome these problems, we exploit a latent pattern model called Low-Rank Latent Pattern Approximation (LLPA) to reconstruct the test image having structural noise...
August 10, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28808433/felix-an-algorithm-for-indexing-multiple-crystallites-in-x-ray-free-electron-laser-snapshot-diffraction-images
#4
Kenneth R Beyerlein, Thomas A White, Oleksandr Yefanov, Cornelius Gati, Ivan G Kazantsev, Nicolai Fog-Gade Nielsen, Peter M Larsen, Henry N Chapman, Søren Schmidt
A novel algorithm for indexing multiple crystals in snapshot X-ray diffraction images, especially suited for serial crystallography data, is presented. The algorithm, FELIX, utilizes a generalized parametrization of the Rodrigues-Frank space, in which all crystal systems can be represented without singularities. The new algorithm is shown to be capable of indexing more than ten crystals per image in simulations of cubic, tetragonal and monoclinic crystal diffraction patterns. It is also used to index an experimental serial crystallography dataset from lysozyme microcrystals...
August 1, 2017: Journal of Applied Crystallography
https://www.readbyqxmd.com/read/28808271/dynamic-modulation-of-poincar%C3%A3-beams
#5
C Alpmann, C Schlickriede, E Otte, C Denz
Generation of complex Poincaré beams is enabled by amplitude and phase modulation accompanied by simultaneous spatially polarization structuring. A holographic system to tailor complex light fields and optical angular momentum structures forecasts promising applications in quantum communication and optical trapping. Experimental results are presented together with simulations of complex Poincaré beams embedding different types of polarization singularities. Additionally, parameters of the dynamic polarization modulation system are discussed and analyzed to demonstrate the enormous capability of the method...
August 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28804918/low-rank-approximation-methods-for-mr-fingerprinting-with-large-scale-dictionaries
#6
Mingrui Yang, Dan Ma, Yun Jiang, Jesse Hamilton, Nicole Seiberlich, Mark A Griswold, Debra McGivney
PURPOSE: This work proposes new low rank approximation approaches with significant memory savings for large scale MR fingerprinting (MRF) problems. THEORY AND METHODS: We introduce a compressed MRF with randomized singular value decomposition method to significantly reduce the memory requirement for calculating a low rank approximation of large sized MRF dictionaries. We further relax this requirement by exploiting the structures of MRF dictionaries in the randomized singular value decomposition space and fitting them to low-degree polynomials to generate high resolution MRF parameter maps...
August 13, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28803778/an-unstable-singularity-underlies-stochastic-phasing-of-the-circadian-clock-in-individual-cyanobacterial-cells
#7
Siting Gan, Erin K O'Shea
The endogenous circadian clock synchronizes with environmental time by appropriately resetting its phase in response to external cues. Of note, some resetting stimuli induce attenuated oscillations of clock output, which has been observed at the population-level in several organisms and in studies of individual humans. To investigate what is happening in individual cellular clocks, we studied the unicellular cyanobacterium S. elongatus. By measuring its phase-resetting responses to temperature changes, we found that population-level arrhythmicity occurs when certain perturbations cause stochastic phases of oscillations in individual cells...
August 9, 2017: Molecular Cell
https://www.readbyqxmd.com/read/28799538/local-magnetic-moments-in-iron-and-nickel-at-ambient-and-earth-s-core-conditions
#8
A Hausoel, M Karolak, E Şaşιoğlu, A Lichtenstein, K Held, A Katanin, A Toschi, G Sangiovanni
Some Bravais lattices have a particular geometry that can slow down the motion of Bloch electrons by pre-localization due to the band-structure properties. Another known source of electronic localization in solids is the Coulomb repulsion in partially filled d or f orbitals, which leads to the formation of local magnetic moments. The combination of these two effects is usually considered of little relevance to strongly correlated materials. Here we show that it represents, instead, the underlying physical mechanism in two of the most important ferromagnets: nickel and iron...
July 12, 2017: Nature Communications
https://www.readbyqxmd.com/read/28799375/comparison-of-liquid-state-anomalies-in-stillinger-weber-models-of-water-silicon-and-germanium
#9
Debdas Dhabal, Charusita Chakravarty, Valeria Molinero, Hemant K Kashyap
We use molecular dynamics simulations to compare and contrast the liquid-state anomalies in the Stillinger-Weber models of monatomic water (mW), silicon (Si), and germanium (Ge) over a fairly wide range of temperatures and densities. The relationships between structure, entropy, and mobility, as well as the extent of the regions of anomalous behavior, are discussed as a function of the degree of tetrahedrality. We map out the cascade of density, structural, pair entropy, excess entropy, viscosity, and diffusivity anomalies for these three liquids...
December 7, 2016: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28798384/dynamics-of-spatiotemporal-line-defects-and-chaos-control-in-complex-excitable-systems
#10
Marcel Hörning, François Blanchard, Akihiro Isomura, Kenichi Yoshikawa
Spatiotemporal pattern formation governs dynamics and functions in various biological systems. In the heart, excitable waves can form complex oscillatory and chaotic patterns even at an abnormally higher frequency than normal heart beats, which increase the risk of fatal heart conditions by inhibiting normal blood circulation. Previous studies suggested that line defects (nodal lines) play a critical role in stabilizing those undesirable patterns. However, it remains unknown if the line defects are static or dynamically changing structures in heart tissue...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28797461/the-importance-of-log-odds-of-positive-lymph-nodes-for-locoregional-recurrence-in-oral-squamous-cell-carcinoma
#11
Ali-Farid Safi, Martin Kauke, Andrea Grandoch, Hans-Joachim Nickenig, Uta Drebber, Joachim Zöller, Matthias Kreppel
OBJECTIVES: Log odds of positive lymph nodes (LODDS) has been demonstrated as a very promising staging model for multiple cancer sites, as it avoids singularity and predicts prognosis significantly better than conventional nodal staging and lymph node ratio. However, published studies on the influence of LODDS for patients with OSCC are very seldom. MATERIAL AND METHODS: Retrospective chart review of 499 patients with treatment-naive oral squamous cell carcinoma...
September 2017: Oral Oncology
https://www.readbyqxmd.com/read/28796534/pronoun-usage-in-online-sexual-predation
#12
Maxim V Baryshevtsev, Matthew S McGlone
We investigated pronoun usage by sexual predators in their online interactions with "decoys" (i.e., adults identifying themselves as children). Computerized text analysis was conducted for 561 instant messaging conversations between contact-driven solicitation offenders (CDSOs) and decoys. CDSOs not only used significantly fewer first-person and more second-person singular pronouns than the decoys but also used more second-person pronouns than adult romantic partners discussing their courtship. The other-focused nature of CDSOs' text messages is consistent with theories of the luring process positing predators' emphasis on making their targets feel special to initiate the cycle of entrapment...
August 10, 2017: Cyberpsychology, Behavior and Social Networking
https://www.readbyqxmd.com/read/28795645/the-royal-typographer-and-the-alchemist-john-dee-willem-silvius-and-the-diagrammatic-alchemy-of-the-monas-hieroglyphica
#13
Stephen Clucas
John Dee's Monas Hieroglyphica (1564) was a work which involved a close collaboration between its author and his "singular friend" the Antwerp printer Willem Silvius, in whose house Dee was living whilst he composed the work and saw it through the press. This article considers the reasons why Dee chose to collaborate with Silvius, and the importance of the intellectual culture - and the print trade - of the Low Countries to the development of Dee's outlook. Dee's Monas was probably the first alchemical work which focused exclusively on the diagrammatic representation of the alchemical process, combining diagrams, cosmological schemes, and various forms of tabular grid...
August 10, 2017: Ambix
https://www.readbyqxmd.com/read/28792892/eemd-domain-ar-spectral-method-for-mean-scatterer-spacing-estimation-of-breast-tumors-from-ultrasound-backscattered-rf-data
#14
Navid Ibtehaj Nizam, S Kaisar Alam, Md Kamrul Hasan
We present a novel method for estimating the mean scatterer spacing (MSS) of breast tumours using ensemble empirical mode decomposition (EEMD) domain analysis of deconvolved backscattered radio-frequency (RF) data. The autoregressive (AR) spectrum from which the MSS is estimated is obtained from the intrinsic mode functions (IMFs) due to regular scatterers embedded in RF data corrupted by the diffuse scatterers. The IMFs are chosen by giving priority to the presence of an enhanced fundamental harmonic and the presence of a greater number of higher harmonics in the AR spectrum estimated from the IMFs...
August 3, 2017: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
https://www.readbyqxmd.com/read/28791522/pre-processing-and-transfer-entropy-measures-in-motor-neurons-controlling-limb-movements
#15
Fernando P Santos, Carlos D Maciel, Philip L Newland
Directed information transfer measures are increasingly being employed in modeling neural system behavior due to their model-free approach, applicability to nonlinear and stochastic signals, and the potential to integrate repetitions of an experiment. Intracellular physiological recordings of graded synaptic potentials provide a number of additional challenges compared to spike signals due to non-stationary behaviour generated through extrinsic processes. We therefore propose a method to overcome this difficulty by using a preprocessing step based on Singular Spectrum Analysis (SSA) to remove nonlinear trends and discontinuities...
August 9, 2017: Journal of Computational Neuroscience
https://www.readbyqxmd.com/read/28790318/evolution-of-the-electronic-band-structure-of-twisted-bilayer-graphene-upon-doping
#16
Shengqiang Huang, Matthew Yankowitz, Kanokporn Chattrakun, Arvinder Sandhu, Brian J LeRoy
The electronic band structure of twisted bilayer graphene develops van Hove singularities whose energy depends on the twist angle between the two layers. Using Raman spectroscopy, we monitor the evolution of the electronic band structure upon doping using the G peak area which is enhanced when the laser photon energy is resonant with the energy separation of the van Hove singularities. Upon charge doping, the Raman G peak area initially increases for twist angles larger than a critical angle and decreases for smaller angles...
August 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28783623/kronecker-basis-representation-based-tensor-sparsity-and-its-applications-to-tensor-recovery
#17
Qi Xie, Qian Zhao, Deyu Meng, Zongben Xu
It is well known that the sparsity/low-rank of a vector/matrix can be rationally measured by nonzero-entries-number ($l_0$ norm)/nonzero- singular-values-number (rank), respectively. However, data from real applications are often generated by the interaction of multiple factors, which obviously cannot be sufficiently represented by a vector/matrix, while a high order tensor is expected to provide more faithful representation to deliver the intrinsic structure underlying such data ensembles. Unlike the vector/matrix case, constructing a rational high order sparsity measure for tensor is a relatively harder task...
August 2, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28777773/comparative-performance-of-pediatric-weight-estimation-techniques-a-human-factor-errors-analysis
#18
Susan M Abdel-Rahman, Ryan Jacobsen, Jennifer L Watts, Stacy L Doyle, Donna M OʼMalley, Tiffany D Hefner, M Denise Dowd
OBJECTIVE: We compared performance characteristics of 7 weight estimation methods examining predictive performance and human factors errors. METHODS: This was a prospective study of 80 emergency care providers (raters) and 80 children aged 2 months to 16 years. Raters estimated weights in 5 children with the following 7 strategies: visual estimation, Advanced Pediatric Life Support, Luscombe and Owens, Broselow tape, devised weight estimation method, 2D Mercy TAPE (2DT), and 3D Mercy TAPE (3DT)...
August 2017: Pediatric Emergency Care
https://www.readbyqxmd.com/read/28777720/delay-differential-analysis-of-seizures-in-multichannel-electrocorticography-data
#19
Claudia Lainscsek, Jonathan Weyhenmeyer, Sydney S Cash, Terrence J Sejnowski
High-density electrocorticogram (ECoG) electrodes are capable of recording neurophysiological data with high temporal resolution with wide spatial coverage. These recordings are a window to understanding how the human brain processes information and subsequently behaves in healthy and pathologic states. Here, we describe and implement delay differential analysis (DDA) for the characterization of ECoG data obtained from human patients with intractable epilepsy. DDA is a time-domain analysis framework based on embedding theory in nonlinear dynamics that reveals the nonlinear invariant properties of an unknown dynamical system...
August 4, 2017: Neural Computation
https://www.readbyqxmd.com/read/28777197/elabela-improves-cardio-renal-outcome-in-fatal-experimental-septic-shock
#20
David Coquerel, Frédéric Chagnon, Xavier Sainsily, Lauralyne Dumont, Alexandre Murza, Jérôme Côté, Robert Dumaine, Philippe Sarret, Éric Marsault, Dany Salvail, Mannix Auger-Messier, Olivier Lesur
OBJECTIVES: Apelin-13 was recently proposed as an alternative to the recommended β-adrenergic drugs for supporting endotoxin-induced myocardial dysfunction. Since Apelin-13 signals through its receptor (Apelin peptide jejunum) to exert singular inotropic/vasotropic actions and to optimize body fluid balance, this candidate pathway might benefit septic shock management. Whether the newly discovered ELABELA (ELA), a second endogenous ligand of the Apelin peptide jejunum receptor highly expressed in the kidney, further improves cardio-renal impairment remains unknown...
August 2, 2017: Critical Care Medicine
keyword
keyword
55810
1
2
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"