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https://www.readbyqxmd.com/read/29791355/laser-coarse-fine-coupling-tracking-by-cascaded-rotation-risley-prism-pairs
#1
Anhu Li, Wansong Sun, Xingsheng Liu, Wei Gong
Rotation Risley prisms are increasingly used for laser tracking due to high precision and good dynamic performance. In this paper, a novel laser coarse-fine coupling tracking method based on two pairs of rotation Risley prisms is proposed to perform the forward and inverse tracking function. The second pair of rotation Risley prisms with narrower wedge angle can achieve higher precision tracking with narrower field of view than the first one, enriching the coarse-fine coupling tracking trajectory patterns. Moreover, an inverse algorithm based on the two-step method and Newton's iterative method is applied to solve the inverse issue for laser coarse-fine coupling tracking...
May 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29789520/t1-weighted-dynamic-contrast-enhanced-magnetic-resonance-imaging-dce-mri-to-distinguish-between-concurrent-cholesterol-granuloma-and-invasive-ductal-carcinoma-of-the-breast-a-case-report
#2
Cheng-Chuan Hu, Tsun-Hou Chang, Hsian-He Hsu, Yi-Jen Pen, Jyh-Cherng Yu
BACKGROUND Cholesterol granuloma is a benign condition that can be misdiagnosed as breast cancer on mammographic and ultrasound imaging. A case of concomitant cholesterol granuloma with invasive ductal carcinoma of the left breast was imaged with ultrasound elastography and magnetic resonance imaging (MRI) methods, including T1-weighted dynamic contrast-enhanced MRI (DCE-MRI), before biopsy and histopathology. CASE REPORT A 52-year-old woman, with a previous history of intraduct papillomas in both breasts, underwent six-monthly follow-up breast imaging...
May 23, 2018: American Journal of Case Reports
https://www.readbyqxmd.com/read/29788797/characteristics-of-the-epithelial-mesenchymal-transition-in-primary-and-paired-metastatic-canine-mammary-carcinomas
#3
Talita M M Raposo-Ferreira, Becky K Brisson, Amy C Durham, Renee Laufer-Amorim, Veronica Kristiansen, Ellen Puré, Susan W Volk, Karin Sorenmo
The epithelial-mesenchymal transition (EMT) is a dynamic process linked to metastasis in many tumor types, including mammary tumors. In this study, we evaluated E-cadherin and vimentin immunolocalization in primary canine mammary carcinomas (20 cases) and their respective metastases, as well as their relationship with the core regulators SNAIL/SLUG. To assess the number of cells undergoing the process of EMT, we quantitated double-positive (E-cadherin+ /vimentin+ ) cells using immunofluorescence, via cell counting and image analysis...
January 1, 2018: Veterinary Pathology
https://www.readbyqxmd.com/read/29788726/dynamics-of-high-risk-clinical-target-volume-reduction-during-brachytherapy-and-impact-on-its-coverage-in-patients-with-inoperable-cervical-cancer
#4
M Pobijakova, D Scepanovic, M Paluga, M Fekete, J Mardiak
Cervical cancer is the third most common cancer in women worldwide. Standard of care for patients with node positive or locally advanced tumors >4 cm is definitive radiotherapy and concurrent chemotherapy. Brachytherapy is an integral part of definitive radiotherapy for cervical cancer. The aim of the study was to show a dynamics of High Risk Clinical Target Volume (HR-CTV) reduction during Brachytherapy (BT) as a part of definitive treatment (External Beam Radiotherapy /EBRT/ +/- Chemotherapy /ChT/) depending on the initial Gross Tumor Volume (GTV) and its impact on HR-CTV coverage in patients with inoperable cervical cancer...
March 14, 2018: Neoplasma
https://www.readbyqxmd.com/read/29787488/effects-of-scleral-lens-tear-clearance-on-corneal-edema-and-post-lens-tear-dynamics-a-pilot-study
#5
Bo Tan, Yixiu Zhou, Tiffany L Yuen, Kristina Lin, Langis Michaud, Meng C Lin
SIGNIFICANCE: The present study with small-diameter scleral lenses (SLs) revealed that post-lens tear thickness (PoLTT) was significantly associated with post-lens tear mixing, but not with central corneal edema, after short-term SL wear. PURPOSE: The aim of this study was to investigate the influence of SL tear clearance (PoLTT) on central corneal thickness and post-lens tear dynamics during 5-hour lens wear. METHODS: Neophytes with no active ocular disease were fitted bilaterally with SLs (hofocon A; 15...
May 21, 2018: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/29784790/the-biomass-distribution-on-earth
#6
Yinon M Bar-On, Rob Phillips, Ron Milo
A census of the biomass on Earth is key for understanding the structure and dynamics of the biosphere. However, a global, quantitative view of how the biomass of different taxa compare with one another is still lacking. Here, we assemble the overall biomass composition of the biosphere, establishing a census of the ≈550 gigatons of carbon (Gt C) of biomass distributed among all of the kingdoms of life. We find that the kingdoms of life concentrate at different locations on the planet; plants (≈450 Gt C, the dominant kingdom) are primarily terrestrial, whereas animals (≈2 Gt C) are mainly marine, and bacteria (≈70 Gt C) and archaea (≈7 Gt C) are predominantly located in deep subsurface environments...
May 21, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29784156/lower-ocular-pulse-amplitude-with-dynamic-contour-tonometry-is-associated-with-biopsy-proven-giant-cell-arteritis
#7
Edsel Ing, Christian Pagnoux, Felix Tyndel, Arun Sundaram, Seymour Hershenfeld, Paul Ranalli, Shirley Chow, Tran Le, Carla Lutchman, Susan Rutherford, Kay Lam, Harleen Bedi, Nurhan Torun
OBJECTIVES: To determine the role of the ocular pulse amplitude (OPA) from Pascal dynamic contour tonometry in predicting the temporal artery biopsy (TABx) result in patients with suspected giant cell arteritis (GCA). DESIGN: Prospective validation study. PARTICIPANTS: Adults aged 50 years or older who underwent TABx from March 2015 to April 2017. METHODS: Subjects on high-dose glucocorticoids more than 14 days or without serology before glucocorticoid initiation were excluded...
June 2018: Canadian Journal of Ophthalmology. Journal Canadien D'ophtalmologie
https://www.readbyqxmd.com/read/29781138/comparison-of-the-progressive-resolution-optimizer-and-photon-optimizer-in-vmat-optimization-for-stereotactic-treatments
#8
Han Liu, Benjamin Sintay, Keith Pearman, Qingyang Shang, Lane Hayes, Jacqueline Maurer, Caroline Vanderstraeten, David Wiant
The photon optimization (PO) algorithm was recently released by Varian Medical Systems to improve volumetric modulated arc therapy (VMAT) optimization within Eclipse (Version 13.5). The purpose of this study is to compare the PO algorithm with its predecessor, progressive resolution optimizer (PRO) for lung SBRT and brain SRS treatments. A total of 30 patients were selected retrospectively. Previously, all the plans were generated with the PRO algorithm within Eclipse Version 13.6. In the new version of PO algorithm (Version 15), dynamic conformal arcs (DCA) were first conformed to the target, then VMAT inverse planning was performed to achieve the desired dose distributions...
May 20, 2018: Journal of Applied Clinical Medical Physics
https://www.readbyqxmd.com/read/29781008/tl-2-s-a-metal-shrouded-two-dimensional-semiconductor
#9
Shiying Shen, Yan Liang, Yandong Ma, Baibiao Huang, Wei Wei, Ying Dai
Recently, the family of metal-shrouded two-dimensional (2D) crystals has expanded rapidly, although most of these crystals are metallic. Using first-principles, we identify a semiconducting 2D metal-shrouded crystal, namely the Tl2S monolayer, which is found to be thermally and dynamically stable, and should be readily exfoliated experimentally. Most importantly, Tl2S monolayers exhibit compelling electronic and photovoltaic properties, i.e., modulable bandgaps of 1.89-2.31 eV, strong light absorption and ideal photo-electricity transduction properties...
May 21, 2018: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29780274/a-frequency-domain-approach-for-parameter-identification-in-multibody-dynamics
#10
Stefan Oberpeilsteiner, Thomas Lauss, Wolfgang Steiner, Karin Nachbagauer
The adjoint method shows an efficient way to incorporate inverse dynamics to engineering multibody applications, as, e.g., parameter identification. In case of the identification of parameters in oscillating multibody systems, a combination of Fourier analysis and the adjoint method is an obvious and promising approach. The present paper shows the adjoint method including adjoint Fourier coefficients for the parameter identification of the amplitude response of oscillations. Two examples show the potential and efficiency of the proposed method in multibody dynamics...
2018: Multibody System Dynamics
https://www.readbyqxmd.com/read/29776153/dimension-dependence-of-clustering-dynamics-in-models-of-ballistic-aggregation-and-freely-cooling-granular-gas
#11
Subhajit Paul, Subir K Das
Via event-driven molecular dynamics simulations we study kinetics of clustering in assemblies of inelastic particles in various space dimensions. We consider two models, viz., the ballistic aggregation model (BAM) and the freely cooling granular gas model (GGM), for each of which we quantify the time dependence of kinetic energy and average mass of clusters (that form due to inelastic collisions). These quantities, for both the models, exhibit power-law behavior, at least in the long time limit. For the BAM, corresponding exponents exhibit strong dimension dependence and follow a hyperscaling relation...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776133/spatiotemporal-dynamics-of-the-covariant-lyapunov-vectors-of-chaotic-convection
#12
M Xu, M R Paul
We explore the spatiotemporal dynamics of the spectrum of covariant Lyapunov vectors for chaotic Rayleigh-Bénard convection. We use the inverse participation ratio to quantify the amount of spatial localization of the covariant Lyapunov vectors. The covariant Lyapunov vectors are found to be spatially localized at times when the instantaneous covariant Lyapunov exponents are large. The spatial localization of the Lyapunov vectors often occurs near defect structures in the fluid flow field. There is an overall trend of decreasing spatial localization of the Lyapunov vectors with increasing index of the vector...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776127/collective-conflict-resolution-in-groups-on-the-move
#13
Itai Pinkoviezky, Iain D Couzin, Nir S Gov
Collective decision-making regarding direction of travel is observed during natural motion of animal and cellular groups. This phenomenon is exemplified, in the simplest case, by a group that contains two informed subgroups that hold conflicting preferred directions of motion. Under such circumstances, simulations, subsequently supported by experimental data with birds and primates, have demonstrated that the resulting motion is either towards a compromise direction or towards one of the preferred targets (even when the two subgroups are equal in size)...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29776073/thermal-decay-of-a-metastable-state-influence-of-rescattering-on-the-quasistationary-dynamical-rate
#14
M V Chushnyakova, I I Gontchar
We study the effect of backscattering of the Brownian particles as they escape out of a metastable state overcoming the potential barrier. For this aim, we model this process numerically using the Langevin equations. This modeling is performed for the wide range of the friction constant covering both the energy and spatial diffusion regimes. It is shown how the influence of the descent stage on the quasistationary decay rate gradually disappears as the friction constant decreases. It is found that, in the energy diffusion regime, the rescattering absents and the descent stage does not influence the decay rate...
March 2018: Physical Review. E
https://www.readbyqxmd.com/read/29775817/janus-graphene-oxide-nanosheet-a-promising-additive-for-enhancement-of-polymeric-membranes-performance-prepared-via-phase-inversion
#15
Mahdi Akbari, Mojtaba Shariaty-Niassar, Takeshi Matsuura, Ahmad Fauzi Ismail
Although polymeric membranes find important role in water and waste water treatment in recent years, their fouling is still an important problem. Application of hydrophilic nanoparticles (NPs) is one of the proposed methods for reducing fouling of membranes but their dispersion and stability in hydrophobic polymer matrix is challenging. In this study Janus functionalization of the NPs was introduced as a promising technique toward achieving this goal. Polysulfone (PSf) membranes containing various concentrations of graphene oxide (GO) nanosheets and Janus graphene oxide (Janus GO) nanosheets (as additives) were fabricated via phase inversion...
May 15, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29775815/simultaneous-magnetic-resonance-and-optical-elastography-acquisitions-comparison-of-displacement-images-and-shear-modulus-estimations-using-a-single-vibration-source
#16
Spencer T Brinker, Steven P Kearney, Thomas J Royston, Dieter Klatt
The mechanical properties of tissue are sensitive to pathological changes, which is the basis for using dynamic elastography as a diagnostic tool. The purpose of this study is a concurrent cross-modality comparison of two dynamic elastography methods, Magnetic Resonance Elastography (MRE) and Scanning Laser Doppler Vibrometry (SLDV) using a single vibration source method. Cylindrical soft tissue mimicking specimens of Plastisol and Ecoflex are stimulated with 60, 100, 150, and 250 Hz sinusoidal vibration during imaging...
May 8, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29775640/prestimulus-delta-and-theta-contributions-to-equiprobable-go-nogo-processing-in-healthy-ageing
#17
Frances M De Blasio, Robert J Barry
Ongoing EEG activity contributes to ERP outcomes of stimulus processing, and each of these measures is known to undergo (sometimes significant) age-related change. Variation in their relationship across the life-span may thus elucidate mechanisms of normal and pathological ageing. This study assessed the relationships between low-frequency EEG prestimulus brain states, the ERP, and behavioural outcomes in a simple equiprobable auditory Go/NoGo paradigm, comparing these for 20 young (Mage  = 20.4 years) and 20 healthy older (Mage  = 68...
May 15, 2018: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/29775203/optimal-two-stage-dynamic-treatment-regimes-from-a-classification-perspective-with-censored-survival-data
#18
Rebecca Hager, Anastasios A Tsiatis, Marie Davidian
Clinicians often make multiple treatment decisions at key points over the course of a patient's disease. A dynamic treatment regime is a sequence of decision rules, each mapping a patient's observed history to the set of available, feasible treatment options at each decision point, and thus formalizes this process. An optimal regime is one leading to the most beneficial outcome on average if used to select treatment for the patient population. We propose a method for estimation of an optimal regime involving two decision points when the outcome of interest is a censored survival time, which is based on maximizing a locally efficient, doubly robust, augmented inverse probability weighted estimator for average outcome over a class of regimes...
May 18, 2018: Biometrics
https://www.readbyqxmd.com/read/29774014/oral-microbiota-community-dynamics-associated-with-oral-squamous-cell-carcinoma-staging
#19
Chia-Yu Yang, Yuan-Ming Yeh, Hai-Ying Yu, Chia-Yin Chin, Chia-Wei Hsu, Hsuan Liu, Po-Jung Huang, Song-Nian Hu, Chun-Ta Liao, Kai-Ping Chang, Yu-Liang Chang
Oral squamous cell carcinoma (OSCC) is a highly aggressive cancer and the fourth leading malignancy among males in Taiwan. Some pathogenic bacteria are associated with periodontitis and oral cancer. However, the comprehensive profile of the oral microbiome during the cancer's progression from the early stage to the late stage is still unclear. We profiled the oral microbiota and identified bacteria biomarkers associated with OSCC. The microbiota of an oral rinse from 51 healthy individuals and 197 OSCC patients at different stages were investigated using 16S rRNA V3V4 amplicon sequencing, followed by bioinformatics and statistical analyses...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29770515/structural-variation-and-rates-of-genome-evolution-in-the-grass-family-seen-through-comparison-of-sequences-of-genomes-greatly-differing-in-size
#20
Jan Dvorak, Le Wang, Tingting Zhu, Chad M Jorgensen, Karin R Deal, Xiongtao Dai, Matthew W Dawson, Hans-Georg Müller, Ming-Cheng Luo, Ramesh K Ramasamy, Hamid Dehghani, Yong Q Gu, Bikram S Gill, Assaf Distelfeld, Katrien M Devos, Peng Qi, Frank M You, Patrick J Gulick, Patrick E McGuire
Homology was searched with genes annotated in the Aegilops tauschii pseudomolecules against genes annotated in the pseudomolecules of tetraploid wild emmer wheat, Brachypodium distachyon, sorghum, and rice. Similar searches were initiated with genes annotated in the rice pseudomolecules. Matrices of colinear genes and rearrangements in their order were constructed. Optical Bionano genome maps were constructed and used to validate rearrangements unique to the wild emmer and Ae. tauschii genomes. Most common rearrangements were short paracentric inversions and short intrachromosomal translocations...
May 16, 2018: Plant Journal: for Cell and Molecular Biology
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