keyword
MENU ▼
Read by QxMD icon Read
search

inverse dynamics

keyword
https://www.readbyqxmd.com/read/28937762/projected-commutator-diis-method-for-accelerating-hybrid-functional-electronic-structure-calculations
#1
Wei Hu, Lin Lin, Chao Yang
The commutator direct inversion of the iterative subspace (commutator DIIS or C-DIIS) method developed by Pulay is an efficient and the most widely used scheme in quantum chemistry to accelerate the convergence of self consistent field (SCF) iterations in Hartree-Fock theory and Kohn-Sham density functional theory. The C-DIIS method requires the explicit storage of the density matrix, the Fock matrix and the commutator matrix. Hence the method can only be used for systems with a relatively small basis set, such as the Gaussian basis set...
September 22, 2017: Journal of Chemical Theory and Computation
https://www.readbyqxmd.com/read/28931926/unveiling-the-signals-from-extremely-noisy-microseismic-data-for-high-resolution-hydraulic-fracturing-monitoring
#2
Weilin Huang, Runqiu Wang, Huijian Li, Yangkang Chen
Microseismic method is an essential technique for monitoring the dynamic status of hydraulic fracturing during the development of unconventional reservoirs. However, one of the challenges in microseismic monitoring is that those seismic signals generated from micro seismicity have extremely low amplitude. We develop a methodology to unveil the signals that are smeared in the strong ambient noise and thus facilitate a more accurate arrival-time picking that will ultimately improve the localization accuracy. In the proposed technique, we decompose the recorded data into several morphological multi-scale components...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28931906/discrete-time-quantum-walk-with-phase-disorder-localization-and-entanglement-entropy
#3
Meng Zeng, Ee Hou Yong
Quantum Walk (QW) has very different transport properties to its classical counterpart due to interference effects. Here we study the discrete-time quantum walk (DTQW) with on-site static/dynamic phase disorder following either binary or uniform distribution in both one and two dimensions. For one dimension, we consider the Hadamard coin; for two dimensions, we consider either a 2-level Hadamard coin (Hadamard walk) or a 4-level Grover coin (Grover walk) for the rotation in coin-space. We study the transport properties e...
September 20, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28930867/pancreatic-neuroendocrine-tumors-computed-tomography-enhancement-but-not-histological-grade-correlates-with-tumor-aggression
#4
Motoyo Yano, Sunil Misra, Danielle H Carpenter, Amber Salter, Charles F Hildebolt
OBJECTIVES: The aims of this study were to assess computed tomography enhancement of pancreatic neuroendocrine tumors (NETs), determine correlation with histological vascularity and fibrosis, and identify a biomarker for tumor aggression. METHODS: The arterial and venous enhancement of NET was calculated on computed tomography for 56 patients. Tumor size and vascularity/fibrosis were assessed. Tumor aggression was grouped by World Health Organization and Hochwald grade and the presence of metastases...
September 19, 2017: Pancreas
https://www.readbyqxmd.com/read/28928189/disability-acquisition-and-mental-health-effect-modification-by-demographic-and-socioeconomic-characteristics-using-data-from-an-australian-longitudinal-study
#5
Zoe Aitken, Julie Anne Simpson, Rebecca Bentley, Anne Marie Kavanagh
OBJECTIVES: There is evidence of a causal relationship between disability acquisition and poor mental health, but the substantial heterogeneity in the magnitude of the effect is poorly understood and may be aetiologically informative. This study aimed to identify demographic and socioeconomic factors that modify the effect of disability acquisition on mental health. DESIGN AND SETTING: The Household, Income and Labour Dynamics in Australia Survey is a nationally representative longitudinal survey of Australian households that has been conducted annually since 2001...
September 18, 2017: BMJ Open
https://www.readbyqxmd.com/read/28923660/factors-influencing-short-term-outcomes-for-older-patients-accessing-emergency-departments-after-a-fall-the-role-of-fall-dynamics
#6
Caterina Trevisan, Patrizia Di Gregorio, Eugenio Debiasi, Martina Pedrotti, Mario La Guardia, Enzo Manzato, Giuseppe Sergi, Albert March
BACKGROUND: While the relevance of falls in raising the risk of fractures, hospitalization and disability in older age is well recognized, the factors influencing the onset of fractures and the need for ward admission after a fall have yet to be fully elucidated. We investigated which factors and fall dynamics were mainly associated with fall-related injuries and hospitalization among elderly persons accessing the Emergency Department (ED) following a fall. METHODS: The study involved 2144 older subjects who accessed the ED after a fall...
September 13, 2017: Gait & Posture
https://www.readbyqxmd.com/read/28920892/computationally-efficient-algorithms-for-sparse-dynamic-solutions-to-the-eeg-source-localization-problem
#7
Elvira Pirondini, Behtash Babadi, Gabriel Obregon-Henao, Camilo Lamus, Wasim Q Malik, Matti S Hamalainen, Patrick L Purdon
OBJECTIVE: Electroencephalography (EEG) and magnetoencephalography (MEG) non-invasively record scalp electromagnetic fields generated by cerebral currents, revealing millisecond-level brain dynamics useful for neuroscience and clinical applications. Estimating the currents that generate these fields, i.e., source localization, is an ill-conditioned inverse problem. Solutions to this problem have focused on spatial continuity constraints, dynamic modeling, or sparsity constraints. The combination of these key ideas could offer significant performance improvements, but substantial computational costs pose a challenge for practical application of such approaches...
September 14, 2017: IEEE Transactions on Bio-medical Engineering
https://www.readbyqxmd.com/read/28919168/contribution-of-interaction-torques-during-dart-throwing-differences-between-novices-and-experts
#8
Nasser Rezzoug, Clint Hansen, Philippe Gorce, Brice Isableu
We examined if experts and novices show different utilization of the torque components impulses during dart throwing. Participants threw darts continuously at a dartboard aiming for the centre (target bull's eye). The upper-limb joint torque impulses were obtained through inverse dynamics with anthropometric and motion capture data as input. Depending on the joint degree of freedom (DOF) and movement phase (acceleration and follow-through), three main strategies of net torque (NET) impulse generation through joint muscle (MUS) and interaction (INT) torque impulses were highlighted...
September 14, 2017: Human Movement Science
https://www.readbyqxmd.com/read/28919017/molecular-characterization-of-lower-vaginal-swabs-for-human-papilloma-virus-in-association-with-chlamydia-trachomatis-infection-in-cameroonian-women
#9
Pythagore Fogue, Geraldo Djeudong, George Bouting, Elom Aglago, Gustave Simo, Smiths Lueong
Human papilloma virus (HPV) infection is an etiological factor for cervical cancer development and Chlamydia trachomatis (Ct) is considered as a cofactor. Understanding the dynamics of HPV and Ct infection could help to explain the incidence of early onset of cervical cancer (CC) observed in Cameroon. Lower vaginal swabs and sera from sexually active women were analyzed for HPV and Ct infection in association with risk factors. Questionnaires were used to document patients' lifestyle and risk factors. A total of 206 women participated in the study average 28...
September 14, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28913930/accuracy-repeatability-and-interplatform-reproducibility-of-t1-quantification-methods-used-for-dce-mri-results-from-a-multicenter-phantom-study
#10
Octavia Bane, Stefanie J Hectors, Mathilde Wagner, Lori L Arlinghaus, Madhava P Aryal, Yue Cao, Thomas L Chenevert, Fiona Fennessy, Wei Huang, Nola M Hylton, Jayashree Kalpathy-Cramer, Kathryn E Keenan, Dariya I Malyarenko, Robert V Mulkern, David C Newitt, Stephen E Russek, Karl F Stupic, Alina Tudorica, Lisa J Wilmes, Thomas E Yankeelov, Yi-Fei Yen, Michael A Boss, Bachir Taouli
PURPOSE: To determine the in vitro accuracy, test-retest repeatability, and interplatform reproducibility of T1 quantification protocols used for dynamic contrast-enhanced MRI at 1.5 and 3‚ÄČT. METHODS: A T1 phantom with 14 samples was imaged at eight centers with a common inversion-recovery spin-echo (IR-SE) protocol and a variable flip angle (VFA) protocol using seven flip angles, as well as site-specific protocols (VFA with different flip angles, variable repetition time, proton density, and Look-Locker inversion recovery)...
September 14, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28912538/decoupled-dynamic-magnetic-field-measurements-improves-diffusion-weighted-magnetic-resonance-images
#11
Ying-Hua Chu, Yi-Cheng Hsu, Fa-Hsuan Lin
Field probes are miniature receiver coils with localized NMR-active samples inside. They are useful in monitoring magnetic field. This information can be used to improve magnetic resonance image quality. While field probes are coupled to each other marginally in most applications, this coupling can cause incorrect resonance frequency estimates and image reconstruction errors. Here, we propose a method to reduce the coupling between field probes in order to improve the accuracy of magnetic field estimation. An asymmetric sensitivity matrix describing the coupling between channels of field probes and NMR active droplets within field probes was empirically measured...
September 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28911866/molecular-dynamics-simulations-of-stratum-corneum-lipid-mixtures-a-multiscale-perspective
#12
Timothy C Moore, Christopher R Iacovella, Anne Leonhard, Annette L Bunge, Clare McCabe
The lipid matrix of the stratum corneum (SC) layer of skin is essential for human survival; it acts as a barrier to prevent rapid dehydration while keeping potentially hazardous material outside the body. While the composition of the SC lipid matrix is known, the molecular-level details of its organization are difficult to infer experimentally, hindering the discovery of structure-property relationships. To this end, molecular dynamics simulations, which give molecular-level resolution, have begun to play an increasingly important role in understanding these relationships...
September 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28911003/personal-exposure-to-fine-particulate-matter-and-benzo-a-pyrene-from-indoor-air-pollution-and-leukocyte-mitochondrial-dna-copy-number-in-rural-china
#13
Jason Y Y Wong, Wei Hu, George S Downward, Wei Jie Seow, Bryan A Bassig, Bu-Tian Ji, Fusheng Wei, Guoping Wu, Jihua Li, Jun He, Chin-San Liu, Wen-Ling Cheng, Yunchao Huang, Kaiyun Yang, Ying Chen, Nathaniel Rothman, Roel C Vermeulen, Qing Lan
Households in Xuanwei and Fuyuan, China, possess hazardous levels of fine particulate matter with an aerodynamic diameter <2.5 microns (PM2.5) and polycyclic aromatic hydrocarbons (PAHs) from coal combustion. Previous studies found that increased exposure to PM2.5 and benzo[a]pyrene (BaP; a PAH) were associated with decreased mitochondrial DNA copy number (mtDNAcn), a marker of oxidative stress. We further evaluated these associations in a cross-sectional study of 148 healthy non-smoking women from Xuanwei and Fuyuan...
September 1, 2017: Carcinogenesis
https://www.readbyqxmd.com/read/28902682/the-influence-of-foot-strike-technique-on-the-neuromechanical-function-of-the-foot
#14
Luke A Kelly, Dominic J Farris, Glen A Lichtwark, Andrew G Cresswell
PURPOSE: The aim of this study was to investigate the influence of foot-strike technique on longitudinal arch mechanics and intrinsic foot muscle function during running. METHODS: 13 healthy participants ran barefoot on a force-instrumented treadmill at 2.8ms with a forefoot (FFS) and rear-foot (RFS, habitual) running technique, while kinetic, kinematic and electromyographic (EMG) data from the intrinsic foot muscles were collected simultaneously. The longitudinal arch was modeled as a single "mid-foot" joint representing motion of the rear-foot (calcaneus) relative to the forefoot (metatarsals)...
September 11, 2017: Medicine and Science in Sports and Exercise
https://www.readbyqxmd.com/read/28900643/unidirectional-rotation-of-cholesteric-droplets-driven-by-uv-light-irradiation
#15
Shinji Bono, Sayumi Sato, Yuka Tabe
We investigated the novel photo-induced dynamics of azobenzene-doped cholesteric (Ch) droplets coexisting with the isotropic (Iso) phase. When the hemispherical Ch droplets initially stuck to glass substrates were irradiated by UV-light, they were parted from the substrates due to the surface disordering caused by the photo-isomerization of azobenzene. Then, the spherical droplets floating in the Iso phase exhibited an unexpected motion - a continuous and unidirectional rotation along the light propagation direction...
September 13, 2017: Soft Matter
https://www.readbyqxmd.com/read/28894193/sub-picosecond-temporal-resolution-of-anomalous-hall-currents-in-gaas
#16
Christian B Schmidt, Shekhar Priyadarshi, Mark Bieler
The anomalous Hall (AH) and spin Hall effects are important tools for the generation, control, and detection of spin and spin-polarized currents in solids and, thus, hold promises for future spintronic applications. Despite tremendous work on these effects, their ultrafast dynamic response is still not well explored. Here, we induce ultrafast AH currents in a magnetically-biased semiconductor by optical femtosecond excitation at room temperature. The currents' dynamics are studied by detecting the simultaneously emitted THz radiation...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28893285/estimates-of-individual-muscle-power-production-in-normal-adult-walking
#17
Ross A Bogey, Lee A Barnes
BACKGROUND: The purpose of this study was to determine the contribution of individual hip muscles to the net hip power in normal adult self-selected speed walking. A further goal was to examine each muscle's role in propulsion or support of the body during that task. METHODS: An EMG-to-force processing (EFP) model was developed which scaled muscle-tendon unit (MTU) force output to gait EMG. Active muscle power was defined as the product of MTU forces (derived from EFP) and that muscle's contraction velocity...
September 11, 2017: Journal of Neuroengineering and Rehabilitation
https://www.readbyqxmd.com/read/28890303/a-simulation-framework-for-humeral-head-translations
#18
Ehsan Sarshari, Alain Farron, Alexandre Terrier, Dominique Pioletti, Philippe Mullhaupt
Humeral head translations (HHT) play a crucial role in the glenohumeral (GH) joint function. The available shoulder musculoskeletal models developed based on inverse dynamics however fall short of predicting the HHT. This study aims at developing a simulation framework that allows forward-dynamics simulation of a shoulder musculoskeletal model with a 6 degrees of freedom (DOF) GH joint. It provides a straightforward solution to the HHT prediction problem. We show that even within a forward-dynamics simulation addressing the HHT requires further information about the contact...
September 7, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28887602/correlation-between-immunohistochemical-staining-of-ceacam1-and-clinicopathological-findings-in-oral-pre-neoplastic-lesions-and-squamous-cell-carcinoma
#19
Oriana Simonetti, Guendalina Lucarini, Corrado Rubini, Antonio Zizzi, Simone Domenico Aspriello, Roberto Di Primio, Anna Maria Offidani
Squamous cell carcinoma of the oral cavity represents the sixth most common cancer worldwide and it is often preceded by pre-neoplastic lesions. Sometimes it is still difficult for pathologists to make objective differential diagnoses only on histological characteristics. Tumorigenesis is accompanied by altered expression of cell adhesion molecules, like carcinoembryonic antigen cell adhesion molecule (CEACAM)1. We wanted to investigative CEACAM1 in oral dysplastic lesions, carcinoma in situ (CIS) and oral squamous cell carcinoma (OSCC)...
September 8, 2017: Medical Molecular Morphology
https://www.readbyqxmd.com/read/28886657/transferable-coarse-grained-model-for-perfluorosulfonic-acid-polymer-membranes
#20
An-Tsung Kuo, Susumu Okazaki, Wataru Shinoda
Perfluorosulfonic acid (PFSA) polymer membranes are widely used as proton exchange membranes. Because the structure of the aqueous domain within the PFSA membrane is expected to directly influence proton conductance, many coarse-grained (CG) simulation studies have been performed to investigate the membrane morphology; these studies mostly used phenomenological models, such as dissipative particle dynamics. However, a chemically accurate CG model is required to investigate the morphology in realistic membranes and to provide a concrete molecular design...
September 7, 2017: Journal of Chemical Physics
keyword
keyword
93956
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"