keyword
MENU ▼
Read by QxMD icon Read
search

simulation center

keyword
https://www.readbyqxmd.com/read/28641253/a-closed-form-solution-to-single-underwater-camera-calibration-using-triple-wavelength-dispersion-and-its-application-to-single-camera-3d-reconstruction
#1
Xida Chen, Yee-Hong Yang
In this paper, we present a new method to estimate the housing parameters of an underwater camera by making full use of triple wavelength dispersion. Our method is based on an important finding that there is a closed-form solution to the distance from the camera center to the refractive interface once the refractive normal is known. The correctness of this finding is mathematically proved in this paper. To our best knowledge, such a finding has not been studied or reported, and hence is never proved theoretically...
June 16, 2017: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/28640601/initiation-of-the-electrochemical-reduction-of-co2-by-a-singly-reduced-ruthenium-ii-bipyridine-complex
#2
Srinivasan Ramakrishnan, Christopher E D Chidsey
The one-electron reduction of [CpRu(bpy)NCCH3]PF6 (Cp = cyclopentadienyl; bpy = 2,2'-bipyridine), abbreviated as [Ru-S](+), where S = CH3CN, in CO2-saturated acetonitrile initiates a cascade of rapid electrochemical and chemical steps (ECEC) at an electrode potential of ca. 100 mV positive of the first reduction of the ruthenium complex. The overall two-electron process leads to the generation of a CO-bound ruthenium complex, [Ru-CO](+), and carbonate, as independently confirmed by NMR spectroscopy. Simulations of the cyclic voltammograms using DigiElch together with density functional theory based calculations reveal that the singly reduced ruthenium complex [Ru-S](0) binds CO2 at a rate of ca...
June 22, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28632499/model-based-sphere-localization-mbsl-in-x-ray-projections
#3
Stefan Sawall, Joscha Maier, Carsten Leinweber, David Prox, Carsten Funck, Jan Kuntz, Marc Kachelriess
The detection of spherical markers in x-ray projections is an important task in a variety of applications, e.g. geometric calibration and detector distortion correction. Therein, the projection of the sphere center on the detector is of particular interest as the used spherical beads are no ideal point-like objects. Only few methods have been proposed to estimate this respective position on the detector with sufficient accuracy and surrogate positions, e.g. the center of gravity, are used, impairing the results of subsequent algorithms...
June 20, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28631174/studies-of-the-interaction-of-influenza-virus-rna-polymerase-pan-with-endonuclease-inhibitors
#4
Li-Hua Dong, Xiao-Rong Cao
Influenza virus is a major causative agent of respiratory viral infections, and RNA polymerase catalyzes its replication and transcription activities in infected cell nuclei. Since it is highly conserved in all virus strains, RNA polymerase becomes a key target of anti-influenza virus agents. Although experimental studies have revealed the good inhibitory activity of endonuclease inhibitors to RNA polymerase, the mechanism is still unclear. In this study, the docking and molecular dynamics simulations have been performed to explore the interaction of three kinds of endonuclease inhibitors with the subunit (PAN) of RNA polymerase...
June 19, 2017: Interdisciplinary Sciences, Computational Life Sciences
https://www.readbyqxmd.com/read/28629581/impact-of-a-teamstepps-trauma-nurse-academy-at-a-level-1-trauma-center
#5
V Kristen Peters, Ellen M Harvey, Andi Wright, Jennifer Bath, Dan Freeman, Bryan Collier
PROBLEM: Nurses are crucial members of the team caring for the acutely injured trauma patient. Until recently, nurses and physicians gained an understanding of leadership and supportive roles separately. With the advent of a multidisciplinary team approach to trauma care, formal team training and simulation has transpired. METHODS: Since 2007, our Level I trauma system has integrated TeamSTEPPS (Team Strategies & Tools to Enhance Performance & Patient Safety; Agency for Healthcare Research and Quality, Rockville, MD) into our clinical care, joint training of nurses and physicians, using simulations with participation of all health care providers...
June 16, 2017: Journal of Emergency Nursing: JEN: Official Publication of the Emergency Department Nurses Association
https://www.readbyqxmd.com/read/28628800/increased-internal-femoral-torsion-can-be-regarded-as-a-risk-factor-for-patellar-instability-a-biomechanical-study
#6
Peter Kaiser, Werner Schmoelz, Philip Schoettle, Marit Zwierzina, Christian Heinrichs, Rene Attal
BACKGROUND: Increased internal femoral torsion is regarded as a risk factor for patellar instability. Biomechanical investigations confirming this hypothesis are missing. METHODS: Eight fresh-frozen cadaver knees were tested on a specially designed simulator. Patellar motion and patellofemoral pressure were evaluated for 0°, 10°, and 20° of increased internal and external femoral torsion with native and with transected medial patellofemoral ligaments used to simulate patellar instability...
June 10, 2017: Clinical Biomechanics
https://www.readbyqxmd.com/read/28628784/identifying-populations-sensitive-to-environmental-chemicals-by-simulating-toxicokinetic-variability
#7
Caroline L Ring, Robert G Pearce, R Woodrow Setzer, Barbara A Wetmore, John F Wambaugh
The thousands of chemicals present in the environment (USGAO, 2013) must be triaged to identify priority chemicals for human health risk research. Most chemicals have little of the toxicokinetic (TK) data that are necessary for relating exposures to tissue concentrations that are believed to be toxic. Ongoing efforts have collected limited, in vitro TK data for a few hundred chemicals. These data have been combined with biomonitoring data to estimate an approximate margin between potential hazard and exposure...
June 16, 2017: Environment International
https://www.readbyqxmd.com/read/28627574/knockout-driven-fragmentation-of-porphyrins
#8
Linda Giacomozzi, Michael Gatchell, Nathalie de Ruette, Michael Wolf, Giovanna D'Angelo, Henning T Schmidt, Henrik Cederquist, Henning Zettergren
We have studied collisions between tetraphenylporphyrin cations and He or Ne at center-of-mass energies in the range 50-110 eV. The experimental results were interpreted in view of density functional theory calculations of dissociation energies and classical molecular dynamics simulations of how the molecules respond to the He/Ne impact. We demonstrate that prompt atom knockout strongly contributes to the total destruction cross sections. Such impulse driven processes typically yield highly reactive fragments and are expected to be important for collisions with any molecular system in this collision energy range, but have earlier been very difficult to isolate for biomolecules...
June 19, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28627504/nature-of-the-spin-glass-phase-in-dense-packings-of-ising-dipoles-with-random-anisotropy-axes
#9
Juan J Alonso, Bartolome Alles
Using tempered Monte Carlo simulations, we study the the spin-glass phase of dense packings of Ising dipoles pointing along random axes. We consider systems of dipoles (i) placed on the sites of a simple cubic lattice with lattice constant d, and (ii) placed at the center of random close packed spheres of diameter d that occupy a 64% of the volume. For both cases we find a spin-glass phase below a certain temperature T_sg . By analysing the data obtained for the overlap parameter, the associated correlation length, as well as the statistics of the overlap distributions of individual samples, we find a behavior consistent with quasi-long-range order in the spin-glass phase, similar to the one previously found in strongly diluted dipolar systems...
June 19, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28627297/a-bayesian-simulation-model-for-breast-cancer-screening-incidence-treatment-and-mortality
#10
Xuelin Huang, Yisheng Li, Juhee Song, Donald A Berry
BACKGROUND: The important but complicated research questions regarding the optimization of mammography screening for the detection of breast cancer are unable to be answered through any single trial or a simple meta-analysis of related trials. The Cancer Intervention and Surveillance Network (CISNET) breast groups provide answers using complex statistical models to simulate population dynamics. Among them, the MD Anderson Cancer Center (Model M) takes a unique approach by not making any assumptions on the natural history of breast cancer, such as the distribution of the indolent time before detection, but simulating only the observable part of a woman's disease and life...
June 1, 2017: Medical Decision Making: An International Journal of the Society for Medical Decision Making
https://www.readbyqxmd.com/read/28626920/experimental-verification-of-egsnrc-monte-carlo-calculated-depth-doses-within-a-realistic-parallel-magnetic-field-in-a-polystyrene-phantom
#11
Andrei Ghila, Stephen Steciw, B Gino Fallone, Satyapal Rathee
PURPOSE: Integrating a linac with a magnetic resonance imager (MRI) will revolutionize the accuracy of external beam radiation treatments. Irradiating in the presence of a strong magnetic field, however, will modify the dose distribution. These dose modifications have been investigated previously, mainly using Monte Carlo simulations. The purpose of this work is to experimentally verify the use of the EGSnrc Monte Carlo (MC) package for calculating percent depth doses (PDDs) in a homogeneous phantom, in the presence of a realistic parallel magnetic field...
June 19, 2017: Medical Physics
https://www.readbyqxmd.com/read/28625309/maternal-mortality-and-the-role-of-the-obstetric-anesthesiologist
#12
REVIEW
Gillian Abir, Jill Mhyre
Maternal mortality is increasing in the United States and remains unacceptably high in many parts of the world. Pre-existing conditions and social determinants of health frequently contribute to maternal death. General solutions to enhance maternal safety focus on systems to identify women at high risk and to tailor the management before, during, and after pregnancy. This review highlights condition-specific solutions for the leading etiologies of maternal death, including cardiac disease, sepsis, hemorrhage, venous thromboembolism, hypertensive disorders of pregnancy, and amniotic fluid embolism...
March 2017: Best Practice & Research. Clinical Anaesthesiology
https://www.readbyqxmd.com/read/28623479/fast-calibration-of-electromagnetically-tracked-oblique-viewing-rigid-endoscopes
#13
Xinyang Liu, Christina E Rice, Raj Shekhar
PURPOSE: The oblique-viewing (i.e., angled) rigid endoscope is a commonly used tool in conventional endoscopic surgeries. The relative rotation between its two moveable parts, the telescope and the camera head, creates a rotation offset between the actual and the projection of an object in the camera image. A calibration method tailored to compensate such offset is needed. METHODS: We developed a fast calibration method for oblique-viewing rigid endoscopes suitable for clinical use...
June 16, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28623085/variability-of-treatment-planning-of-seed-implantation-a-japanese-multicenter-simulation-study
#14
Hiromichi Ishiyama, Masahiro Nakano, Kazuhito Toya, Ryuichi Kota, Koyo Kikuchi, Takahiro Yamaguchi, Naoaki Kono, Shogo Kawakami, Yuki Tsutsumi, Tomoki Tanaka, Takahisa Eriguchi, Saiji Ohga, Toshihiro Yamaguchi, Yoshiaki Takakawa, Masashi Morita, Norihisa Katayama, Toshio Ohashi, Manabu Aoki, Atsunori Yorozu, Siro Saito
PURPOSE: This multicenter study was conducted to evaluate the current variability of treatment planning of seed implantation in Japanese centers and the feasibility of two virtual trials. METHODS AND MATERIALS: Two types of contour data were sent to 12 radiation oncologists with a request letter that asked them to make treatment plans on the data in the same manner as in their own practice. Five of the 12 radiation oncologists were asked to participate in the two virtual trials in which the D90 (dose to the hottest 90% of prostate volume) was 1) required to be set at just 180 Gy and 2) increased as much as possible without violating other limitations...
June 13, 2017: Brachytherapy
https://www.readbyqxmd.com/read/28622718/surface-effect-on-oil-transportation-in-nanochannel-a-molecular-dynamics-study
#15
Haixia Zheng, Yonggang Du, Qingzhong Xue, Lei Zhu, Xiaofang Li, Shuangfang Lu, Yakang Jin
In this work, we investigate the dynamics mechanism of oil transportation in nanochannel using molecular dynamics simulations. It is demonstrated that the interaction between oil molecules and nanochannel has a great effect on the transportation properties of oil in nanochannel. Because of different interactions between oil molecules and channel, the center of mass (COM) displacement of oil in a 6-nm channel is over 30 times larger than that in a 2-nm channel, and the diffusion coefficient of oil molecules at the center of a 6-nm channel is almost two times more than that near the channel surface...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28622215/influence-of-gender-on-the-performance-of-cardiopulmonary-rescue-teams-a-randomized-prospective-simulator-study
#16
Simon Adrian Amacher, Cleo Schumacher, Corinne Legeret, Franziska Tschan, Norbert Karl Semmer, Stephan Marsch, Sabina Hunziker
OBJECTIVES: Little is known about the influence of gender on resuscitation performance which may improve future education in resuscitation. The aim of this study was to compare female and male rescuers in regard to cardiopulmonary resuscitation and leadership performance. DESIGN: Prospective, randomized simulator study. SETTING: High-fidelity patient simulator center of the medical ICU, University Hospitals Basel (Switzerland). SUBJECTS: Two hundred sixteen volunteer medical students (108 females and 108 males) of two Swiss universities in teams of three...
July 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28620166/ab-initio-molecular-dynamics-simulation-of-low-energy-radiation-responses-of-%C3%AE-al2o3
#17
Y G Yuan, M Jiang, F A Zhao, H Chen, H Gao, H Y Xiao, X Xiang, X T Zu
In this study, an ab initio molecular dynamics method is employed to investigate the response behavior of α-Al2O3 to low energy irradiation. Different from the previous experiments, our calculations reveal that the displacements of oxygen dominate under electron irradiation and the created defects are mainly oxygen vacancy and interstitial. The experimental observation of the absorption peaks appearing at 203, 233 and 256 nm for α-Al2O3 under electron irradiations should be contributed by the oxygen defects and these defects will reduce the transmittance of α-Al2O3, which agrees well with the very recent experiment...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28619402/global-health-values-of-a-multidirectional-near-peer-training-program-in-surgery-pathology-anatomy-research-methodology-and-medical-education-for-haitian-rwandan-and-canadian-medical-students
#18
Malik Elharram, Trish Dinh, Annie Lalande, Susan Ge, Sophie Gao, Geoffroy Noël
BACKGROUND: As health care delivery increasingly requires providers to cross international borders, medical students at McGill University, Canada, developed a multidirectional exchange program with Haiti and Rwanda. The program integrates surgery, pathology, anatomy, research methodology, and medical education. OBJECTIVE: The aim of the present study was to explore the global health value of this international training program to improve medical education within the environment of developing countries, such as Haiti and Rwanda, while improving sociocultural learning of Canadian students...
March 2017: Annals of Global Health
https://www.readbyqxmd.com/read/28619268/ankle-hindfoot-after-calcaneal-fractures-a-biomechanical-study
#19
Xu Can, Li Mingqing, Wang Chenggong, Li Kanghua, Liu Hua
INTRODUCTION: Both the overall shape of the calcaneus and anatomical reduction of joint congruity are important prognostic factors. However, there is a significant lack of biomechanical data supporting the clinical importance of calcaneus height, length and heel width. The objective of this study was to determine the effects of abnormal calcaneus morphology on ankle-hindfoot biomechanics. HYPOTHESIS: The normal biomechanics of the ankle-hindfoot would be severely disrupted by the abnormal calcaneus morphology...
June 12, 2017: Orthopaedics & Traumatology, Surgery & Research: OTSR
https://www.readbyqxmd.com/read/28618638/localized-dark-solitons-and-vortices-in-defocusing-media-with-spatially-inhomogeneous-nonlinearity
#20
Jianhua Zeng, Boris A Malomed
Recent studies have demonstrated that defocusing cubic nonlinearity with local strength growing from the center to the periphery faster than r^{D}, in space of dimension D with radial coordinate r, supports a vast variety of robust bright solitons. In the framework of the same model, but with a weaker spatial-growth rate ∼r^{α} with α≤D, we test here the possibility to create stable localized continuous waves (LCWs) in one-dimensional (1D) and 2D geometries, localized dark solitons (LDSs) in one dimension, and localized dark vortices (LDVs) in two dimensions, which are all realized as loosely confined states with a divergent norm...
May 2017: Physical Review. E
keyword
keyword
53851
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"