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https://www.readbyqxmd.com/read/28812995/optimizing-waveform-maximum-determination-for-specular-point-tracking-in-airborne-gnss-r
#1
Erwan Motte, Mehrez Zribi
Airborne GNSS-R campaigns are crucial to the understanding of signal interactions with the Earth's surface. As a consequence of the specific geometric configurations arising during measurements from aircraft, the reflected signals can be difficult to interpret under certain conditions like over strongly attenuating media such as forests, or when the reflected signal is contaminated by the direct signal. For these reasons, there are many cases where the reflectivity is overestimated, or a portion of the dataset has to be flagged as unusable...
August 16, 2017: Sensors
https://www.readbyqxmd.com/read/28809694/a-multiple-view-geometric-model-of-specularities-on-non-planar-shapes-with-application-to-dynamic-retexturing
#2
Alexandre Morgand, Mohamed Tamaazousti, Adrien Bartoli
Predicting specularities in images, given the camera pose and scene geometry from SLAM, forms a challenging and open problem. It is nonetheless essential in several applications such as retexturing. A recent geometric model called JOLIMAS partially answers this problem, under the assumptions that the specularities are elliptical and the scene is planar. JOLIMAS models a moving specularity as the image of a fixed 3D quadric. We propose dual JOLIMAS, a new model which raises the planarity assumption. It uses the fact that specularities remain elliptical on convex surfaces and that every surface can be divided in convex parts...
August 10, 2017: IEEE Transactions on Visualization and Computer Graphics
https://www.readbyqxmd.com/read/28800205/wide-field-color-imaging-of-scatter-based-tissue-contrast-using-both-high-spatial-frequency-illumination-and-cross-polarization-gating
#3
Mackenzie L Carlson, David M McClatchy, Jason R Gunn, Jonathan T Elliott, Keith D Paulsen, Stephen C Kanick, Brian W Pogue
This study characterizes the scatter-specific tissue contrast that can be obtained by high spatial frequency (HSF) domain imaging and cross-polarization (CP) imaging, using a standard color imaging system, and how combining them may be beneficial. Both HSF and CP approaches are known to modulate the sensitivity of epi-illumination reflectance images between diffuse multiply-scattered and superficially backscattered photons, providing enhanced contrast from microstructure and composition than what is achieved by standard wide-field imaging...
August 11, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28797649/comparison-of-manual-automated-analysis-methods-for-corneal-endothelial-cell-density-measurements-by-specular-microscopy
#4
Jianyan Huang, Jyotsna Maram, Tudor C Tepelus, Cristina Modak, Ken Marion, SriniVas R Sadda, Vikas Chopra, Olivia L Lee
PURPOSE: To determine the reliability of corneal endothelial cell density (ECD) obtained by automated specular microscopy versus that of validated manual methods and factors that predict such reliability. METHODS: Sharp central images from 94 control and 106 glaucomatous eyes were captured with Konan specular microscope NSP-9900. All images were analyzed by trained graders using Konan CellChek Software, employing the fully- and semi-automated methods as well as Center Method...
August 7, 2017: Journal of Optometry
https://www.readbyqxmd.com/read/28796609/piecewise-planar-stereoscan-sequential-structure-and-motion-using-plane-primitives
#5
Carolina Raposo, Michel Antunes, Joao P Barreto
The article describes a pipeline that receives as input a sequence of stereo images, and outputs the camera motion and a Piecewise-Planar Reconstruction (PPR) of the scene. The pipeline, named Piecewise-Planar StereoScan (PPSS), works as follows: the planes in the scene are detected for each stereo view using semi-dense depth estimation; the relative pose is computed by a new closed-form minimal algorithm that only uses point correspondences whenever plane detections do not fully constrain the motion; the camera motion and the PPR are jointly refined by alternating between discrete optimization and continuous bundle adjustment; and, finally, the detected 3D planes are segmented in images using a new framework that handles low texture and visibility issues...
August 9, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28789539/angle-resolved-molecular-beam-scattering-of-no-at-the-gas-liquid-interface
#6
Amelia Zutz, David J Nesbitt
This study presents first results on angle-resolved, inelastic collision dynamics of thermal and hyperthermal molecular beams of NO at gas-liquid interfaces. Specifically, a collimated incident beam of supersonically cooled NO ((2)Π1/2, J = 0.5) is directed toward a series of low vapor pressure liquid surfaces ([bmim][Tf2N], squalane, and PFPE) at θinc = 45(1)°, with the scattered molecules detected with quantum state resolution over a series of final angles (θs = -60°, -30°, 0°, 30°, 45°, and 60°) via spatially filtered laser induced fluorescence...
August 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28772484/preparation-and-optimization-of-fluorescent-thin-films-of-rosamine-sio2-tio2-composites-for-no2-sensing
#7
María G Guillén, Francisco Gámez, Belén Suárez, Carla Queirós, Ana M G Silva, Ángel Barranco, Juan Ramón Sánchez-Valencia, José María Pedrosa, Tânia Lopes-Costa
The incorporation of a prototypical rosamine fluorescent dye from organic solutions into transparent and microstructured columnar TiO2 and SiO2 (MO2) thin films, prepared by evaporation at glancing angles (GAPVD), was evaluated. The aggregation of the adsorbed molecules, the infiltration efficiency and the adsorption kinetics were studied by means of UV-Vis absorption and fluorescence spectroscopies. Specifically, the infiltration equilibrium as well as the kinetic of adsorption of the emitting dye has been described by a Langmuir type adsorption isotherm and a pseudosecond order kinetic model, respectively...
January 31, 2017: Materials
https://www.readbyqxmd.com/read/28762404/coherent-quantum-scattering-of-ch4-from-ni-111
#8
Amjad Al Taleb, Daniel Farías
We have measured high-resolution angular distributions of methane scattered from a Ni(111) surface at incident energies between 68.9 meV and 108.6 meV. A sharp and intense specular peak has been observed, in addition to sharp features corresponding to rotationally inelastic diffraction (RID) peaks along the two main symmetry directions of Ni(111). The intensity of the most intense RID peaks is ca. 50% of the specular one. The observation of sharp, coherent elastic peaks at such low incident energies suggests that single scattering dominates over trapping at these energies, and that the depth of the van der Waals well should be lower than 60 meV...
August 16, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28744701/aging-and-visual-3-d-shape-recognition-from-motion
#9
J Farley Norman, Olivia C Adkins, Catherine J Dowell, Stevie C Hoyng, Lindsey M Shain, Lauren E Pedersen, Jonathan D Kinnard, Alexia J Higginbotham, Ashley N Gilliam
Two experiments were conducted to evaluate the ability of younger and older adults to recognize 3-D object shape from patterns of optical motion. In Experiment 1, participants were required to identify dotted surfaces that rotated in depth (i.e., surface structure portrayed using the kinetic depth effect). The task difficulty was manipulated by limiting the surface point lifetimes within the stimulus apparent motion sequences. In Experiment 2, the participants identified solid, naturally shaped objects (replicas of bell peppers, Capsicum annuum) that were defined by occlusion boundary contours, patterns of specular highlights, or combined optical patterns containing both boundary contours and specular highlights...
July 25, 2017: Attention, Perception & Psychophysics
https://www.readbyqxmd.com/read/28731934/long-term-evaluation-of-specular-microscopic-changes-following-nd-yag-iridotomy-in-chronic-primary-angle-closure-glaucoma-eyes
#10
Ramanjit Sihota, Esha Agarwal, Mathew James, Meena Verma, Lalit Kumar, Tanuj Dada, Viney Gupta, Kulwant Singh Kapoor
AIM: The aim of this study was to evaluate specular microscopy of chronic primary angle-closure glaucoma (CPACG) eyes at least 1 year after Nd:YAG iridotomy, and compare them with CPACG eyes without an iridotomy and age-matched, normal eyes. PATIENTS AND METHOD: Consecutive patients of CPACG at the Glaucoma service were screened. All patients underwent slit-lamp biomicroscopy, +90 D examination, and applanation tonometry. A total of 100 eyes of 100 consecutive patients of CPACG with an Nd:YAG iridotomy performed ≥1 year before, who met all inclusion/exclusion criteria, 60 consecutive CPACG eyes without an iridotomy, and 60 age and refraction-matched control eyes were enrolled...
July 20, 2017: Journal of Glaucoma
https://www.readbyqxmd.com/read/28718823/surface-chemistry-interactions-of-cationorm-with-films-by-human-meibum-and-tear-film-compounds
#11
Georgi As Georgiev, Norihiko Yokoi, Yana Nencheva, Nikola Peev, Philippe Daull
Cationorm(®) (CN) cationic nanoemulsion was demonstrated to enhance tear film (TF) stability in vivo possibly via effects on tear film lipid layer (TFLL). Therefore the interactions of CN with human meibum (MGS) and TFLL in vitro and in vivo deserve special study. MGS and CN were spread at the air/water interface of a Langmuir surface balance to ensure a range of MGS/CN oil phase ratios: 20/1, 10/1, 5/1, 3/1, 2/1 and 1/1. The films capability to reorganize during dynamic area changes was evaluated via the surface pressure-area compression isotherms and step/relaxation dilatational rheology studies...
July 18, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28714237/effects-of-intracameral-ascorbic-acid-on-the-corneal-endothelium-of-dogs-undergoing-phacoemulsification
#12
Ivan R M Padua, Gisele P Valdetaro, Tiago B Lima, Karina K Kobashigawa, Paloma E S Silva, Marcela Aldrovani, Pedro P M Padua, Jose L Laus
OBJECTIVE: Cataracts are the most common ocular disorder in dogs. Phacoemulsification is the preferred treatment method among ophthalmologists, but the cellularity of the endothelium must be considered for its success, as endothelial lesions may produce permanent corneal decompensation. The objective of this study was to evaluate the effects of intracameral ascorbic acid, a known antioxidant, on the corneal endothelium of dogs undergoing phacoemulsification. ANIMAL STUDIED: In all, 40 eyes from 20 dogs, males and females from 7 to 12 years of age, were assessed for mature cataracts...
July 17, 2017: Veterinary Ophthalmology
https://www.readbyqxmd.com/read/28699324/corneal-endothelial-cell-loss-and-corneal-biomechanical-characteristics-after-two-step-sequential-or-combined-phaco-vitrectomy-surgery-for-idiopathic-epiretinal-membrane
#13
Hassan Hamoudi, Ulrik Correll Christensen, Morten La Cour
PURPOSE: To assess the impact of sequential and combined surgery [cataract surgery and 23-gauge pars plana vitrectomy (PPV) with peeling] on corneal endothelium cell density (CED) and corneal biomechanical characteristics. METHODS: Phakic eyes with epiretinal membrane (ERM) were prospectively allocated to (i) cataract surgery and subsequent PPV (CAT group), (ii) PPV and subsequent cataract surgery (VIT group) or (iii) phacovitrectomy (COMBI group). Eyes were examined at baseline, 1 month after each surgery, and at 3 and 12 months follow-up...
August 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28696173/multimodal-imaging-in-anterior-uveitis
#14
Jay Siak, Padmamalini Mahendradas, Soon-Phaik Chee
Anterior uveitis is the most common group of uveitis worldwide, with a diverse spectrum ranging from autoimmune and infectious to masquerade etiologies. Elucidation of the underlying etiology may be challenging, but it remains important, especially for recurrent uveitis. Multimodal imaging has improved our understanding and management of many posterior uveitis and panuveitis. Similarly, a wide variety of anterior segment ophthalmic imaging techniques are available to allow the monitoring of the structural changes that may develop during anterior uveitis...
June 2017: Ocular Immunology and Inflammation
https://www.readbyqxmd.com/read/28692574/technician-consistency-in-specular-microscopy-measurements-a-real-world-retrospective-analysis-of-a-united-states-eye-bank
#15
Gabriel M Rand, Ji Won Kwon, Patrick K Gore, Mitchell D McCartney, Roy S Chuck
PURPOSE: To quantify consistency of endothelial cell density (ECD) measurements among technicians in a single US eye bank operating under typical operating conditions. METHODS: In this retrospective analysis of 51 microscopy technicians using a semiautomated counting method on 35,067 eyes from July 2007 to May 2015, technician- and date-related marginal ECD effects were calculated using linear regression models. ECD variance was correlated with the number of specular microscopy technicians...
July 7, 2017: Cornea
https://www.readbyqxmd.com/read/28682792/performance-of-a-high-resolution-depth-encoding-pet-detector-using-barium-sulfate-reflector
#16
Zhonghua Kuang, Xiaohui Wang, Cheng Li, Xinhan Deng, Kai Feng, Zhanli Hu, Xin Fu, Ning Ren, Xianming Zhang, Yunfei Zheng, Dong Liang, Xin Liu, Hairong Zheng, Yongfeng Yang
Small animal positron emission tomography (PET) is a well-established imaging modality in preclinical biomedical research. The performance of current small animal PET scanners is mainly limited by the detector performance and depth-encoding detectors are required to simultaneously achieve high spatial resolution and high sensitivity. In this work, the performance of a high-resolution dual-ended readout lutetium-yttrium oxyorthosilicate (LYSO) array using barium sulfate powder (BaSO4) as the inter-crystal reflector was measured for the first time and compared to that of a LYSO array using the most commonly used enhanced specular reflector (ESR)...
July 6, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/28677912/analysis-of-kera-in-four-families-with-cornea-plana-identifies-two-novel-mutations
#17
Lubica Dudakova, Jang Hee J Vercruyssen, Irina Balikova, Lavina Postolache, Bart P Leroy, Pavlina Skalicka, Petra Liskova
PURPOSE: To identify the molecular genetic cause in four families of various ethnic backgrounds with cornea plana. METHODS: Detailed ophthalmological examination and direct sequencing of the KERA coding region in five patients of Czech and Turkish origin and their available family members. RESULTS: Compound heterozygosity for a novel missense mutation c.209C>T; p.(Pro70Leu) and a novel splice site mutation c.887-1G>A in KERA were detected in two affected siblings of Czech origin...
July 5, 2017: Acta Ophthalmologica
https://www.readbyqxmd.com/read/28674859/comparison-of-central-corneal-thickness-and-endothelial-cell-measurements-by-scheimpflug-camera-system-and-two-noncontact-specular-microscopes
#18
Irmak Karaca, Suzan Guven Yilmaz, Melis Palamar, Halil Ates
PURPOSE: To investigate the correlation of Scheimpflug camera system and two noncontact specular microscopes in terms of central corneal thickness (CCT) and corneal endothelial cell morphology measurements. METHODS: One hundred eyes of 50 healthy subjects were examined by Pentacam Scheimpflug Analyzer, CEM-530 (Nidek Co, Ltd, Gamagori, Japan) and CellChek XL (Konan Medical, California, USA) via fully automated image analysis with no corrections made. Measurement differences and agreement between instruments were determined by intraclass correlation analysis...
July 3, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28670843/poorly-differentiated-vaginal-adenocarcinoma-with-aggressive-behavior-pap-smear-findings
#19
José Eleutério, Francisca Margalene Medeiros de Freitas, Denise Nunes Oliveira, David Freitas Moreira, Mirley Sângela Pessoa
Vaginal carcinoma is a rare condition. In this report, we describe a case of a poorly differentiated aggressive adenocarcinoma in a woman with a three month history of vaginal bleeding and a negative Pap smear done six months prior to her consultation. Specular examination showed a normal cervix, but there was a bleeding ulcer (2 cm in diameter) in the upper third of the vagina. Cytology revealed poorly differentiated atypical cells, and the biopsy established a diagnosis of vaginal adenocarcinoma with little differentiation...
July 3, 2017: Diagnostic Cytopathology
https://www.readbyqxmd.com/read/28664948/experimental-review-chemical-reduction-of-graphene-oxide-go-to-reduced-graphene-oxide-rgo-by-aqueous-chemistry
#20
L G Guex, B Sacchi, K F Peuvot, R L Andersson, A M Pourrahimi, V Ström, S Farris, R T Olsson
The electrical conductivity of reduced graphene oxide (rGO) obtained from graphene oxide (GO) using sodium borohydride (NaBH4) as a reducing agent has been investigated as a function of time (2 min to 24 h) and temperature (20 °C to 80 °C). Using a 300 mM aqueous NaBH4 solution at 80 °C, reduction of GO occurred to a large extent during the first 10 min, which yielded a conductivity increase of 5 orders of magnitude to 10 S m(-1). During the residual 1400 min of reaction, the reduction rate decreased significantly, eventually resulting in a rGO conductivity of 1500 S m(-1)...
July 13, 2017: Nanoscale
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