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https://www.readbyqxmd.com/read/28103193/comprehensive-use-of-curvature-for-robust-and-accurate-online-surface-reconstruction
#1
Damien Lefloch, Markus Kluge, Hamed Sarbolandi, Tim Weyrich, Andreas Kolb
Interactive real-time scene acquisition from hand-held depth cameras has recently developed much momentum, enabling applications in ad-hoc object acquisition, augmented reality and other fields. A key challenge to online reconstruction remains error accumulation in the reconstructed camera trajectory, due to drift-inducing instabilities in the range scan alignments of the underlying iterative-closest-point (ICP) algorithm. Various strategies have been proposed to mitigate that drift, including SIFT-based pre-alignment, color-based weighting of ICP pairs, stronger weighting of edge features, and so on...
January 5, 2017: IEEE Transactions on Pattern Analysis and Machine Intelligence
https://www.readbyqxmd.com/read/28102755/anionic-lipids-and-the-maintenance-of-membrane-electrostatics-in-eukaryotes
#2
Matthieu Pierre Platre, Yvon Jaillais
A wide range of signaling processes occurs at the cell surface through the reversible association of proteins from the cytosol to the plasma membrane. Some low abundant lipids are enriched at the membrane of specific compartments and thereby contribute to the identity of cell organelles by acting as biochemical landmarks. Lipids also influence membrane biophysical properties, which emerge as an important feature in specifying cellular territories. Such parameters are crucial for signal transduction and include lipid packing, membrane curvature and electrostatics...
January 19, 2017: Plant Signaling & Behavior
https://www.readbyqxmd.com/read/28097869/a-solvent-free-processable-and-photo-patternable-hybrid-gate-dielectric-for-flexible-top-gate-organic-field-effect-transistors
#3
Jun Seon Kwon, Han-Wool Park, Do Hwan Kim, Young-Je Kwark
We report a novel solvent-free and direct photo-patternable poly[(mercaptopropyl)methyl-siloxane] (PMMS) hybrid dielectric for flexible top-gate organic field-effect transistors (OFETs), utilizing a photo-activated thiol-ene reaction under UV irradiation of 254 nm to induce cross-linking, even in air and at low temperature. In particular, a solvent-free PMMS-f dielectric film, for which an optimal cross-linking density is shown by a well-organized molar ratio between thiol and vinyl in the thiol-ene reaction, exhibited a high dielectric constant (5...
January 18, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28097480/average-flow-generation-by-a-pulsating-flow-near-a-curved-interface
#4
Lyudmila S Klimenko, Dmitry V Lyubimov
This paper is devoted to the study of curvature influence on the average flow generation near the fluid interface. The time averaging of a non-uniform pulsating flow often results in a nonzero average flow in the bulk. The well-known average flow occurs near a solid surface, the so-called Schlichting mechanism of the average flow generation. For flows with a free surface there is the other known mechanism of Longuet-Higgins, according to which the average flow is generated by surface waves traveling on a free surface...
January 2017: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/28096361/thermal-driven-domain-and-cargo-transport-in-lipid-membranes
#5
Emma L Talbot, Lucia Parolini, Jurij Kotar, Lorenzo Di Michele, Pietro Cicuta
Domain migration is observed on the surface of ternary giant unilamellar vesicles held in a temperature gradient in conditions where they exhibit coexistence of two liquid phases. The migration localizes domains to the hot side of the vesicle, regardless of whether the domain is composed of the more ordered or disordered phase and regardless of the proximity to chamber boundaries. The distribution of domains is explored for domains that coarsen and for those held apart due to long-range repulsions. After considering several potential mechanisms for the migration, including the temperature preferences for each lipid, the favored curvature for each phase, and the thermophoretic flow around the vesicle, we show that observations are consistent with the general process of minimizing the system's line tension energy, because of the lowering of line interface energy closer to mixing...
January 17, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28094514/structural-model-of-the-tubular-assembly-of-the-rous-sarcoma-virus-capsid-protein
#6
Jaekyun Jeon, Xin Qiao, Ivan Hung, Alok K Mitra, Ambroise Desfosses, Daniel Huang, Peter L Gor'kov, Rebecca C Craven, Richard L Kingston, Zhehong Gan, Fangqiang Zhu, Bo Chen
The orthoretroviral capsid protein (CA) assembles into polymorphic capsids, whose architecture, assembly and stability are still being investigated. The N-terminal and C-terminal domains of CA (NTD and CTD, respectively) engage in both homotypic and heterotypic interactions to create the capsid. Hexameric turrets formed by the NTD decorate the majority of the capsid surface. We report nearly-complete solid-state NMR (ssNMR) resonance assignments of Rous sarcoma virus (RSV) CA, assembled into hexamer tubes that mimic the authentic capsid...
January 17, 2017: Journal of the American Chemical Society
https://www.readbyqxmd.com/read/28094405/controlled-and-tunable-design-of-polymer-interface-for-immobilization-of-enzymes-does-curvature-matter
#7
Claudia Marschelke, Ivan Raguzin, Anke Matura, Andreas Fery, Alla Synytska
Control and tuning of surface properties is indispensable for the programmed and rational design of materials. Particularly, polymeric brush-modified colloids can be used as carrier materials for enzyme immobilization. Although it is of prime importance to control the brush architecture, there is still a lack of systematic investigations concerning the impact of grafting density on the properties of the designed interface, as well as on the immobilization of biomolecules. In this work, we investigate the surface properties of polymer brushes with different grafting densities prepared using a "grafting from" approach on flat and on colloidal particle substrates by varying the density of initiator groups...
January 17, 2017: Soft Matter
https://www.readbyqxmd.com/read/28076811/modeling-the-effect-of-curvature-on-the-collective-behavior-of-cells-growing-new-tissue
#8
Mohd Almie Alias, Pascal R Buenzli
The growth of several biological tissues is known to be controlled in part by local geometrical features, such as the curvature of the tissue interface. This control leads to changes in tissue shape that in turn can affect the tissue's evolution. Understanding the cellular basis of this control is highly significant for bioscaffold tissue engineering, the evolution of bone microarchitecture, wound healing, and tumor growth. Although previous models have proposed geometrical relationships between tissue growth and curvature, the role of cell density and cell vigor remains poorly understood...
January 10, 2017: Biophysical Journal
https://www.readbyqxmd.com/read/28075594/high-curvature-nanostructuring-enhances-probe-display-for-biomolecular-detection
#9
Phil De Luna, Sahar Mahshid, Jagotamoy Das, Binquan Luan, Edward H Sargent, Shana O Kelley, Ruhong Zhou
High-curvature electrodes facilitate rapid and sensitive detection of a broad class of molecular analytes. These sensors have reached detection limits not attained using bulk macroscale materials. It has been proposed that immobilized DNA probes are displayed at a high deflection angle on the sensor surface, allowing greater accessibility and more efficient hybridization. Here we report the first use of all-atom molecular dynamics simulations coupled with electrochemical experiments to explore the dynamics of ssDNA immobilized on high-curvature vs...
January 11, 2017: Nano Letters
https://www.readbyqxmd.com/read/28075590/nanometer-sized-water-bridge-and-pull-off-force-in-afm-at-different-relative-humidities-reproducibility-measurement-and-model-based-on-surface-tension-change
#10
Miroslav Bartošík, Lukáš Kormoš, Lukáš Flajšman, Radek Kalousek, Jindřich Mach, Zuzana Lišková, David Nezval, Vojtěch Švarc, Tomáš Šamořil, Tomáš Šikola
This article deals with the analysis of the relationship between the pull-off force measured by atomic force microscopy and the dimensions of water bridge condensed between a hydrophilic silicon oxide tip and a silicon oxide surface under ambient conditions. Our experiments have shown that the pull-off force increases linearly with the radius of the tip and nonmonotonically with the relative humidity (RH). The latter dependence generally consists of an initial constant part changing to a convex-concave-like increase of the pull-off force and finally followed by a concave-like decrease of this force...
January 11, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28060287/the-measurement-of-unsteady-surface-pressure-using-a-remote-microphone-probe
#11
Yaoyi Guan, Carl R Berntsen, Michael J Bilka, Scott C Morris
Microphones are widely applied to measure pressure fluctuations at the walls of solid bodies immersed in turbulent flows. Turbulent motions with various characteristic length scales can result in pressure fluctuations over a wide frequency range. This property of turbulence requires sensing devices to have sufficient sensitivity over a wide range of frequencies. Furthermore, the small characteristic length scales of turbulent structures require small sensing areas and the ability to place the sensors in very close proximity to each other...
December 3, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/28060144/effect-of-overnight-wear-orthokeratology-lenses-on-corneal-shape-and-tears
#12
Jian Li, Ping Dong, Hu Liu
OBJECTIVE: The aim of this study was to explore the effects of the overnight wear orthokeratology (OK) lenses on corneal shape and tear film stability. METHODS: Forty patients with myopia aged between 11 and 18 years who wore OK lens continuously for more than 1 year were selected. Refractive error (D), corneal curvature, corneal surface regularity index (SRI), tear breakup time (TBUT), Schirmer I test score, and corneal staining were measured at the following time points: 1 week before wearing the OK lens (T0) and 1 week (T1), 1 month (T2), 3 months (T3), 6 months (T4), and 12 months (T5) after wear...
January 4, 2017: Eye & Contact Lens
https://www.readbyqxmd.com/read/28059380/triggered-single-photon-emission-up-to-77k-from-ordered-array-of-surface-curvature-directed-mesa-top-gaas-ingaas-single-quantum-dots
#13
Jiefei Zhang, Siyuan Lu, Swarnabha Chattaraj, Anupam Madhukar
We demonstrate triggered single photon emission up to 77K from an ordered 5x8 array of InGaAs single quantum dots (SQDs). The SQDs are grown selectively on patterned mesa tops utilizing substrate-encoded size-reducing epitaxy (SESRE). It exploits designed surface-curvature stress gradients to preferentially direct atom migration from mesa sidewalls to the top during growth. The emission from the SQDs exhibits a g<sup>(2)</sup>(0) of 0.19 ± 0.03 at 8K and decent emission spectral uniformity (standard deviation <1% of emission wavelength)...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059136/ultra-sensitive-pressure-sensor-based-on-guided-straight-mechanical-cracks
#14
Yong Whan Choi, Daeshik Kang, Peter V Pikhitsa, Taemin Lee, Sang Moon Kim, Gunhee Lee, Dongha Tahk, Mansoo Choi
Recently, a mechanical crack-based strain sensor with high sensitivity was proposed by producing free cracks via bending metal coated film with a known curvature. To further enhance sensitivity and controllability, a guided crack formation is needed. Herein, we demonstrate such a ultra-sensitive sensor based on the guided formation of straight mechanical cracks. The sensor has patterned holes on the surface of the device, which concentrate the stress near patterned holes leading to generate uniform cracks connecting the holes throughout the surface...
January 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28054062/stretching-induced-wrinkling-in-plastic-rubber-composites
#15
Junyu Yang, Sameer Damle, Spandan Maiti, Sachin S Velankar
We examine the mechanics of three-layer composite films composed of an elastomeric layer sandwiched between two thin surface layers of plastic. Upon stretching and releasing such composite films, they develop a highly wrinkled surface texture. The mechanism for this texturing is that during stretching, the plastic layers yield and stretch irreversibly whereas the elastomer stretches reversibly. Thus upon releasing, the plastic layers buckle due to compressive stress imposed by the elastomer. Experiments are conducted using SEPS elastomer and 50 micron thick LLDPE plastic films...
January 5, 2017: Soft Matter
https://www.readbyqxmd.com/read/28048633/tu-ab-202-08-generating-organ-surfaces-to-overcome-random-contouring-errors-and-slice-thickness-variations-on-multimodality-images
#16
S Oh, E Weiss, G Christensen, G Hugo, J Williamson
PURPOSE: To propose a new method that generates smooth organ surface meshes that overcomes random contouring errors and volume averaging artifacts for hollow organs. METHODS: The proposed contour-to-smooth mesh generation method (CSMG) consists of two parts; 1) reconstructing the inner and outer surfaces of the hollow organ with triangular meshes based on parametric active surface (PAS) and 2) modifying the reconstructed inner surface in order to satisfy minimum wall thickness constraints and matching the patient's known organ wall volume...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28048473/we-de-201-11-sensitivity-and-specificity-of-verification-methods-based-on-total-reference-air-kerma-trak-or-on-user-provided-dose-points-for-graphically-planned-skin-hdr-brachytherapy
#17
A Damato, P Devlin, M Bhagwat, I Buzurovic, J Hansen, D O'Farrell, R Cormack
PURPOSE: To investigate the sensitivity and specificity of a novel verification methodology for image-guided skin HDR brachytherapy plans using a TRAK-based reasonableness test, compared to a typical manual verification methodology. METHODS: Two methodologies were used to flag treatment plans necessitating additional review due to a potential discrepancy of 3 mm between planned dose and clinical target in the skin. Manual verification was used to calculate the discrepancy between the average dose to points positioned at time of planning representative of the prescribed depth and the expected prescription dose...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047642/su-d-202-02-quantitative-imaging-correlation-between-image-feature-analysis-and-the-accuracy-of-manually-drawn-contours-on-pet-images
#18
N Lamichhane, P Johnson, F Chinea, V Patel, F Yang
PURPOSE: To evaluate the correlation between image features and the accuracy of manually drawn target contours on synthetic PET images METHODS: A digital PET phantom was used in combination with Monte Carlo simulation to create a set of 26 simulated PET images featuring a variety of tumor shapes and activity heterogeneity. These tumor volumes were used as a gold standard in comparisons with manual contours delineated by 10 radiation oncologist on the simulated PET images. Metrics used to evaluate segmentation accuracy included the dice coefficient, false positive dice, false negative dice, symmetric mean absolute surface distance, and absolute volumetric difference...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047444/mo-fg-campus-jep3-02-a-novel-setup-approach-to-improve-c-spine-curvature-reproducibility-for-head-and-neck-radiotherapy-using-optical-surface-imaging-with-two-regions-of-interest
#19
K Ryan, M Gil, C Della Biancia, G Li
PURPOSE: To develop a novel approach to improve cervical spine (c-spine) curvature reproducibility for head and neck (HN) patients using optical surface imaging (OSI) with two regions of interests (ROIs). METHODS: The OSI-guided, two-step setup procedure requires two ROIs: ROI-1 of the shoulders and ROI-2 of the face. The neck can be stretched or squeezed in superior-inferior (SI) direction using a specially-designed sliding head support. We hypothesize that when these two ROIs are aligned, the c-spine should fall into a naturally reproducible position under same setup conditions...
June 2016: Medical Physics
https://www.readbyqxmd.com/read/28047379/mo-de-207a-02-a-feature-preserving-image-reconstruction-method-for-improved-pancreaticlesion-classification-in-diagnostic-ct-imaging
#20
J Xu, B Tsui, F Noo
PURPOSE: To develop a feature-preserving model based image reconstruction (MBIR) method that improves performance in pancreatic lesion classification at equal or reduced radiation dose. METHODS: A set of pancreatic lesion models was created with both benign and premalignant lesion types. These two classes of lesions are distinguished by their fine internal structures; their delineation is therefore crucial to the task of pancreatic lesion classification. To reduce image noise while preserving the features of the lesions, we developed a MBIR method with curvature-based regularization...
June 2016: Medical Physics
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