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https://www.readbyqxmd.com/read/29353322/statistical-analysis-of-phase-formation-in-2d-colloidal-systems
#1
Hauke Carstensen, Vassilios Kapaklis, Max Wolff
Colloidal systems offer unique opportunities for the study of phase formation and structure since their characteristic length scales are accessible to visible light. As a model system the two-dimensional assembly of colloidal magnetic and non-magnetic particles dispersed in a ferrofluid (FF) matrix is studied by transmission optical microscopy. We present a method to statistically evaluate images with thousands of particles and map phases by extraction of local variables. Different lattice structures and long-range connected branching chains are observed, when tuning the effective magnetic interaction and varying particle ratios...
January 23, 2018: European Physical Journal. E, Soft Matter
https://www.readbyqxmd.com/read/29353289/the-new-agreement-of-the-international-riga-consensus-conference-on-nasal-airway-function-tests
#2
K Vogt, G Bachmann-Harildstad, A Lintermann, A Nechyporenko, F Peters, K D Wernecke
The report reflects an agreement based on the consensus conference of the International Standardization Committee on the Objective Assessment of the Nasal Airway in Riga, 2nd Nov. 2016. The aim of the conference was to address the existing nasal airway function tests and to take into account physical, mathematical and technical correctness as a base of international standardization as well as the requirements of the Council Directive 93/42/EEC of 14 June 1993 concerning medical devices. Rhinomanometry, acoustic rhinometry, peak nasal inspiratory flow, Odiosoft-Rhino, optical rhinometry, 24-h measurements, computational fluid dynamics, nasometry and the mirrow test were evaluated for important diagnostic criteria, which are the precision of the equipment including calibration and the software applied; validity with sensitivity, specificity, positive and negative predictive values, reliability with intra-individual and inter-individual reproducibility and responsiveness in clinical studies...
January 21, 2018: Rhinology
https://www.readbyqxmd.com/read/29353272/optical-coherence-tomography-angiography-offers-new-insights-into-choriocapillaris-perfusion
#3
Jost L Lauermann, Nicole Eter, Florian Alten
The choriocapillaris (CC) represents a fundamentally important vascular layer that is subject to physiologic changes with increasing age and that is also associated with a wide range of chorioretinal diseases. So far, information on blood flow in this specific layer has remained limited. With the advent of optical coherence tomography angiography (OCTA), new perspectives and possibilities of CC imaging have begun to evolve. This article shall review the opportunities and challenges of applying OCTA technology to the CC layer and summarize the current clinical efforts in OCTA CC imaging exemplarily in dry age-related macular degeneration and central serous chorioretinopathy...
January 19, 2018: Ophthalmologica. Journal International D'ophtalmologie
https://www.readbyqxmd.com/read/29353111/investigation-of-phase-separated-polyimide-blend-films-containing-boron-nitride-using-ftir-imaging
#4
Boknam Chae, Deok Gi Hong, Young Mee Jung, Jong Chan Won, Seung Woo Lee
Immiscible aromatic polyimide (PI) blend films and a PI blend film incorporated with thermally conductive boron nitride (BN) were prepared, and their phase separation behaviors were examined by optical microscopy and FTIR imaging. The 2,2'-bis(trifluoromethyl)benzidine (TFMB)-containing and 4,4'-thiodianiline (TDA)-containing aromatic PI blend films and a PI blend/BN composite film show two clearly separated regions; one region is the TFMB-rich phase, and the other region is the TDA-rich phase. The introduction of BN induces morphological changes in the immiscible aromatic PI blend film without altering the composition of either domain...
January 10, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29352993/comparison-of-chorioretinal-layers-in-rhesus-macaques-using-spectral-domain-optical-coherence-tomography-and-high-resolution-histological-sections
#5
Glenn Yiu, Zhe Wang, Christian Munevar, Eric Tieu, Bradley Shibata, Brittany Wong, David Cunefare, Sina Farsiu, Jeffrey Roberts, Sara Thomasy
Nonhuman primates are important preclinical models of retinal diseases because they uniquely possess a macula similar to humans. Ocular imaging technologies such as spectral-domain optical coherence tomography (SD-OCT) allow noninvasive, in vivo measurements of chorioretinal layers with near-histological resolution. However, the boundaries are based on differences in reflectivity, and detailed correlations with histological tissue layers have not been explored in rhesus macaques, which are widely used for biomedical research...
January 15, 2018: Experimental Eye Research
https://www.readbyqxmd.com/read/29352976/anterior-segment-imaging-for-angle-closure
#6
Sunee Chansangpetch, Prin Rojanapongpun, Shan C Lin
PURPOSE: To summarize the role of anterior segment imaging (AS-imaging) in angle closure diagnosis and management, and the possible advantages over the current standard of gonioscopy. DESIGN: Literature review and perspective. METHODS: Review of the pertinent publications with interpretation and perspective in relation to the use of AS-imaging in angle closure assessment focusing on anterior segment optical coherence tomography and ultrasound biomicroscopy...
January 15, 2018: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/29352944/fabrication-of-cellulose-nanowhiskers-reinforced-chitosan-xylan-nanocomposite-films-with-antibacterial-and-antioxidant-activities
#7
Yuping Bao, Hao Zhang, Qian Luan, Mingming Zheng, Hu Tang, Fenghong Huang
Antibacterial and antioxidant chitosan-xylan/cellulose nanowhiskers (CNW) nanocomposite films were successfully prepared using CNW as nanofillers. The structure and morphology of the nanocomposite films were investigated by Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), and scanning electron microscopy (SEM). The optical transmittance, thermal stability, mechanical property, and swelling property of the nanocomposite films were also evaluated. These results revealed the microstructure of the films and confirmed the good miscibility between chitosan-xylan and CNW...
March 15, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29352776/plasma-cvd-of-hydrogenated-boron-carbon-thin-films-from-triethylboron
#8
Mewlude Imam, Carina Höglund, Susann Schmidt, Richard Hall-Wilton, Jens Birch, Henrik Pedersen
Low-temperature chemical vapor deposition (CVD) of B-C thin films is of importance for neutron voltaics and semiconductor technology. The highly reactive trialkylboranes, with alkyl groups of 1-4 carbon atoms, are a class of precursors that have been less explored for low-temperature CVD of B-C films. Herein, we demonstrate plasma CVD of B-C thin films using triethylboron (TEB) as a single source precursor in an Ar plasma. We show that the film density and B/C ratio increases with increasing plasma power, reaching a density of 2...
January 21, 2018: Journal of Chemical Physics
https://www.readbyqxmd.com/read/29352576/corrigendum-to-landscape-determinants-of-spatio-temporal-patterns-of-aerosol-optical-depth-in-the-two-most-polluted-metropolitans-in-the-united-states-sci-total-environ-609-2017-1556-1565
#9
Chenghao Wang, Chuyuan Wang, Soe W Myint, Zhi-Hua Wang
No abstract text is available yet for this article.
January 15, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29352564/optical-metabolic-imaging-of-irradiated-rat-heart-exposed-to-ischemia-reperfusion-injury
#10
Mette Funding la Cour, Shima Mehrvar, James S Heisner, Mohammad Masoudi Motlagh, Meetha Medhora, Mahsa Ranji, Amadou K S Camara
Whole thoracic irradiation (WTI) is known to cause deterioration in cardiac function. Whether irradiation predisposes the heart to further ischemia and reperfusion (IR) injury is not well known. The aim of this study is to examine the susceptibility of rat hearts to IR injury following a single fraction of 15 Gy WTI and to investigate the role of mitochondrial metabolism in the differential susceptibility to IR injury. After day 35 of irradiation, ex vivo hearts from irradiated and nonirradiated rats (controls) were exposed to 25-min global ischemia followed by 60-min IR, or hearts were perfused without IR for the same protocol duration [time controls (TC)]...
January 2018: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/29352470/a-laser-optical-method-for-predicting-adulteration-of-clover-honey-bee
#11
A E El-Raie, H E Hassan, A A Abd El-Rahman, R A Shaimaa
The authenticity of honey is great importance for commercial and health reasons. Adulteration of honey bee with cheaper sweetening materials has been used. The objectives of this study were: 1) To evaluate the quality of honey bee according to physicochemical characteristics, 2) To estimate the transmission property of prediction of honey using visible laser technique, and 3) Possibility of adulteration of honey bee according to high transmission intensity of laser beam through Clover honey bee. Helium-neon (He-Ne) laser in the visible light with wavelengths 632...
January 20, 2018: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/29352352/morphology-structure-and-optical-properties-of-semiconductor-films-with-gesisn-nanoislands-and-strained-layers
#12
Vyacheslav Timofeev, Alexandr Nikiforov, Artur Tuktamyshev, Vladimir Mashanov, Michail Yesin, Aleksey Bloshkin
The dependences of the two-dimensional to three-dimensional growth (2D-3D) critical transition thickness on the composition for GeSiSn films with a fixed Ge content and Sn content from 0 to 16% at the growth temperature of 150 °С have been obtained. The phase diagrams of the superstructure change during the epitaxial growth of Sn on Si and on Ge(100) have been built. Using the phase diagram data, it becomes possible to identify the Sn cover on the Si surface and to control the Sn segregation on the superstructure observed on the reflection high-energy electron diffraction (RHEED) pattern...
January 19, 2018: Nanoscale Research Letters
https://www.readbyqxmd.com/read/29352317/optic-flow-detection-is-not-influenced-by-visual-vestibular-congruency
#13
Vivian Holten, Paul R MacNeilage
Optic flow patterns generated by self-motion relative to the stationary environment result in congruent visual-vestibular self-motion signals. Incongruent signals can arise due to object motion, vestibular dysfunction, or artificial stimulation, which are less common. Hence, we are predominantly exposed to congruent rather than incongruent visual-vestibular stimulation. If the brain takes advantage of this probabilistic association, we expect observers to be more sensitive to visual optic flow that is congruent with ongoing vestibular stimulation...
2018: PloS One
https://www.readbyqxmd.com/read/29352222/artificial-chameleon-skin-that-controls-spectral-radiation-development-of-chameleon-cool-coating-c3
#14
Hiroki Gonome, Masashi Nakamura, Junnosuke Okajima, Shigenao Maruyama
Chameleons have a diagnostic thermal protection that enables them to live under various conditions. Our developed special radiative control therefore is inspired by the chameleon thermal protection ability by imitating its two superposed layers as two pigment particles in one coating layer. One particle imitates a chameleon superficial surface for color control (visible light), and another particle imitates a deep surface to reflect solar irradiation, especially in the near-infrared region. Optical modeling allows us to optimally design the particle size and volume fraction...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352215/magnetically-sensitive-nanodiamond-doped-tellurite-glass-fibers
#15
Yinlan Ruan, David A Simpson, Jan Jeske, Heike Ebendorff-Heidepriem, Desmond W M Lau, Hong Ji, Brett C Johnson, Takeshi Ohshima, Shahraam Afshar V, Lloyd Hollenberg, Andrew D Greentree, Tanya M Monro, Brant C Gibson
Traditional optical fibers are insensitive to magnetic fields, however many applications would benefit from fiber-based magnetometry devices. In this work, we demonstrate a magnetically sensitive optical fiber by doping nanodiamonds containing nitrogen vacancy centers into tellurite glass fibers. The fabrication process provides a robust and isolated sensing platform as the magnetic sensors are fixed in the tellurite glass matrix. Using optically detected magnetic resonance from the doped nanodiamonds, we demonstrate detection of local magnetic fields via side excitation and longitudinal collection...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352177/photonic-spin-hall-effect-enabled-refractive-index-sensor-using-weak-measurements
#16
Xinxing Zhou, Lijuan Sheng, Xiaohui Ling
In this work, we theoretically propose an optical biosensor (consists of a BK7 glass, a metal film, and a graphene sheet) based on photonic spin Hall effect (SHE). We establish a quantitative relationship between the spin-dependent shift in photonic SHE and the refractive index of sensing medium. It is found that, by considering the surface plasmon resonance effect, the refractive index variations owing to the adsorption of biomolecules in sensing medium can effectively change the spin-dependent displacements...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352158/fabrication-of-multiple-nanopores-in-a-sinx-membrane-via-controlled-breakdown
#17
Yunlong Wang, Cuifeng Ying, Wenyuan Zhou, Lennart de Vreede, Zhibo Liu, Jianguo Tian
This paper reports a controlled breakdown (CBD) method to fabricate multiple nanopores in a silicon nitride (SiNx) membrane with control over both nanopore count and nanopore diameter. Despite the stochastic process of the breakdown, we found that the nanopores created via CBD, tend to be of the same diameter. We propose a membrane resistance model to explain and control the multiple nanopores forming in the membrane. We prove that the membrane resistance can reflect the number of nanopores in the membrane and that the diameter of the nanopores is controlled by the exposure time and strength of the electric field...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352141/pressure-effect-on-impurity-local-vibrational-mode-and-phase-transitions-in-n-type-iron-doped-indium-phosphide
#18
Chih-Ming Lin, I-Jui Hsu, Sin-Cheng Lin, Yu-Chun Chuang, Wei-Ting Chen, Yen-Fa Liao, Jenh-Yih Juang
The evolution of iron local vibrational mode (Fe LVM) and phase transitions in n-type iron-doped indium phosphide (InP:Fe) were investigated at ambient temperature. In-situ angle-dispersive X-ray diffraction measurements revealed that InP:Fe starts to transform from zinc-blende (ZB) to rock-salt (RS) structure around 8.2(2) GPa and completes around 16.0(2) GPa. The Raman shift of both transverse and longitudinal optical modes increases monotonically with increasing pressure, while their intensities become indiscernible at 11...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29352140/ultra-high-photoresponsivity-in-suspended-metal-semiconductor-metal-mesoscopic-multilayer-mos2-broadband-detector-from-uv-to-ir-with-low-schottky-barrier-contacts
#19
Gustavo A Saenz, Goran Karapetrov, James Curtis, Anupama B Kaul
The design, fabrication, and characterization of ultra-high responsivity photodetectors based on mesoscopic multilayer MoS2 is presented, which is a less explored system compared to direct band gap monolayer MoS2 that has received increasing attention in recent years. The device architecture is comprised of a metal-semiconductor-metal (MSM) photodetector, where Mo was used as the contact metal to suspended MoS2 membranes. The photoresponsivity [Formula: see text] was measured to be ~1.4 × 104 A/W, which is > 104 times higher compared to prior reports, while the detectivity D* was computed to be ~2...
January 19, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29351994/full-molecular-trajectories-of-rna-polymerase-at-single-base-pair-resolution
#20
Maurizio Righini, Antony Lee, Cristhian Cañari-Chumpitaz, Troy Lionberger, Ronen Gabizon, Yves Coello, Ignacio Tinoco, Carlos Bustamante
In recent years, highly stable optical tweezers systems have enabled the characterization of the dynamics of molecular motors at very high resolution. However, the motion of many motors with angstrom-scale dynamics cannot be consistently resolved due to poor signal-to-noise ratio. Using an acousto-optic deflector to generate a "time-shared" dual-optical trap, we decreased low-frequency noise by more than one order of magnitude compared with conventional dual-trap optical tweezers. Using this instrument, we implemented a protocol that synthesizes single base-pair trajectories, which are used to test a Large State Space Hidden Markov Model algorithm to recover their individual steps...
January 19, 2018: Proceedings of the National Academy of Sciences of the United States of America
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