keyword
MENU ▼
Read by QxMD icon Read
search

Channel

keyword
https://www.readbyqxmd.com/read/28438006/measurements-and-modeling-of-multipath-interference-at-wavelengths-below-cable-cut-off-in-a-g-654-optical-fiber-span
#1
John D Downie, Jason Hurley, Hector DePedro, Steven Garner, Jeremy Blaker, Aramais Zakharian, Sergey Ten, Greg Mills
Transmission below the cable cut-off wavelength may be a concern in some systems, especially for an optical supervisory channel (OSC) operating below the signal transmission band in systems built with G.654 fiber. In this work, we constructed a cabled span of G.654-compliant fiber and measured the multipath interference (MPI) generated during propagation through the span at a range of wavelengths below the cable cut-offs of the constituent fibers. Measurements were made under a range of conditions including different splice losses and the presence or absence of higher order mode filters placed around the splices...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437962/rapidly-reconfigurable-high-fidelity-optical-arbitrary-waveform-generation-in-heterogeneous-photonic-integrated-circuits
#2
Shaoqi Feng, Chuan Qin, Kuanping Shang, Shibnath Pathak, Weicheng Lai, Binbin Guan, Matthew Clements, Tiehui Su, Guangyao Liu, Hongbo Lu, Ryan P Scott, S J Ben Yoo
This paper demonstrates rapidly reconfigurable, high-fidelity optical arbitrary waveform generation (OAWG) in a heterogeneous photonic integrated circuit (PIC). The heterogeneous PIC combines advantages of high-speed indium phosphide (InP) modulators and low-loss, high-contrast silicon nitride (Si<sub>3</sub>N<sub>4</sub>) arrayed waveguide gratings (AWGs) so that high-fidelity optical waveform syntheses with rapid waveform updates are possible. The generated optical waveforms spanned a 160 GHz spectral bandwidth starting from an optical frequency comb consisting of eight comb lines separated by 20 GHz channel spacing...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437956/single-shot-areal-profilometry-using-hyperspectral-interferometry-with-a-microlens-array
#3
Pablo D Ruiz, Jonathan M Huntley
We describe a single-shot technique to measure areal profiles on optically smooth and stepped surfaces for applications where rapid data acquisition in non-cooperative environments is essential. It is based on hyperspectral interferometry (HSI), a technique in which the output of a white-light interferometer provides the input to a hyperspectral imaging system. Previous HSI implementations suffered from inefficient utilisation of the available pixels which limited the number of measured coordinates and/or unambiguous depth range...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437950/maximum-likelihood-sequence-estimation-for-optical-complex-direct-modulation
#4
Di Che, Feng Yuan, William Shieh
Semiconductor lasers are versatile optical transmitters in nature. Through the direct modulation (DM), the intensity modulation is realized by the linear mapping between the injection current and the light power, while various angle modulations are enabled by the frequency chirp. Limited by the direct detection, DM lasers used to be exploited only as 1-D (intensity or angle) transmitters by suppressing or simply ignoring the other modulation. Nevertheless, through the digital coherent detection, simultaneous intensity and angle modulations (namely, 2-D complex DM, CDM) can be realized by a single laser diode...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437934/dual-channel-multilayer-coated-surface-plasmon-resonance-sensor-for-dual-refractive-index-range-measurements
#5
Mengdi Lu, Wei Peng, Qiang Liu, Yun Liu, Lixia Li, Yuzhang Liang, Jean-Francois Masson
We present a novel multilayer-coated surface plasmon resonance sensor for dual refractive index range measurements based on a capillary structure. The sensing elements include an internally coated Ag layer and an externally coated bilayer of Au with an overlayer of thin indium tin oxide (ITO). The internal Ag layer was sensitive to higher refractive index (RI) medium while the external Au/ITO layer was sensitive to lower refractive index medium. We evaluated the sensor performance by measuring RI changes in two channels, RI sensitivities were -1951 nm/RIU and 2496 nm/RIU, respectively...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437908/ionization-degree-measurement-in-the-gain-medium-of-a-hydrocarbon-free-rubidium-vapor-laser-operating-in-pulsed-and-cw-modes
#6
Xiaofan Zhao, Zining Yang, Weihong Hua, Hongyan Wang, Xiaojun Xu
Although the diode pumped alkali laser (DPAL) works in a three-level scheme, higher energy-state excitation and ionization processes exist during operation, which may lead to deleterious effects on laser performance. In this paper, we report the ionization degree measurement in the gain medium of an operational hydrocarbon-free Rb DPAL by using the optogalvanic method. The results show that, at the pulsed mode with a duration of ~1 ms, a maximal ionization degree of ~0.06% is obtained at a pump power of 140 W...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437896/variability-of-apparent-and-inherent-optical-properties-of-sediment-laden-waters-in-large-river-basins-lessons-from-in-situ-measurements-and-bio-optical-modeling
#7
Sylvain Pinet, Jean-Michel Martinez, Sylvain Ouillon, Bruno Lartiges, Raul Espinoza Villar
We investigated the relationships between inherent and apparent optical properties (IOP and AOP, respectively) and suspended sediment concentrations (SSC) in the main Amazonian river waters. In situ measurements of SSC, remote sensing reflectance (R<sub>rs</sub>), the diffuse light attenuation coefficient (K<sub>d</sub>) and the total and non-algal particle (NAP) absorption coefficients (a<sub>TOT</sub> and a<sub>NAP</sub>, respectively) were conducted during three sampling trips along different streams of the Amazon River catchment (104 stations)...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437833/transient-receptor-potential-trp-channels-and-exercise-associated-muscle-cramping-eamc-a-tale-of-multiple-complexities
#8
EDITORIAL
M P Schwellnus, M D Hoffman
No abstract text is available yet for this article.
April 24, 2017: Muscle & Nerve
https://www.readbyqxmd.com/read/28437797/central-and-peripheral-vision-for-scene-recognition-a-neurocomputational-modeling-exploration
#9
Panqu Wang, Garrison W Cottrell
What are the roles of central and peripheral vision in human scene recognition? Larson and Loschky (2009) showed that peripheral vision contributes more than central vision in obtaining maximum scene recognition accuracy. However, central vision is more efficient for scene recognition than peripheral, based on the amount of visual area needed for accurate recognition. In this study, we model and explain the results of Larson and Loschky (2009) using a neurocomputational modeling approach. We show that the advantage of peripheral vision in scene recognition, as well as the efficiency advantage for central vision, can be replicated using state-of-the-art deep neural network models...
April 1, 2017: Journal of Vision
https://www.readbyqxmd.com/read/28437593/tabula-rasa-in-the-patagonian-channels-the-phylogeography-of-oreobolus-obtusangulus-cyperaceae
#10
Simon Pfanzelt, Dirk C Albach, Klaus Bernhard von Hagen
The extent of the Pleistocene glaciations in the Patagonian Channel region (southwesternmost South America) and their impact on the vegetation there is largely unknown. Whether the regional flora was wiped out completely (tabula rasa) or survived in ice-free pockets (in situ survival) is still an open question. The molecular imprint of either scenario should still be visible in extant populations. Therefore, DNA sequence data of Oreobolus obtusangulus Gaudich. (Cyperaceae) were analyzed. This species is an abundant constitutent of Patagonian cushion peat bogs, one of the Patagonian Channel region's major vegetation types...
April 24, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28437476/clc-3-chloride-channel-mediates-the-role-of-parathyroid-hormone-1-34-on-osteogenic-differentiation-of-osteoblasts
#11
Xiaolin Lu, Yin Ding, Qiannan Niu, Shijie Xuan, Yan Yang, Yulong Jin, Huan Wang
INTRODUCTION: Different concentrations of parathyroid hormone [1-34] (PTH [1-34]) can have totally opposite effects on osteoblasts. Intermittent stimulation with PTH can significantly increase bone mineral density in vitro, mainly through the protein kinase A (PKA) signaling pathway, which phosphorylates runt-related transcription factor 2 (Runx2). The ClC-3 chloride channel, an important anion channel, can also promote osteogenesis via the Runx2 pathway based on recent studies. The purpose of our study, therefore, is to research whether the ClC-3 chloride channel has an effect on PTH osteodifferentiation in MC3T3-E1 cells...
2017: PloS One
https://www.readbyqxmd.com/read/28437449/insecticide-resistance-status-of-malaria-vectors-in-lao-pdr
#12
Sébastien Marcombe, Julie Bobichon, Boutsady Somphong, Nothasin Phommavan, Santi Maithaviphet, Simone Nambanya, Vincent Corbel, Paul T Brey
Knowledge on insecticide resistance in Anopheles species is a basic requirement to guide malaria vector control programs. In Lao PDR, vector control relies on insecticide residual spraying (IRS) and impregnated bed-nets (ITNs) with the use of pyrethroids. Here, the susceptibility of Anopheles species, including several malaria vectors (An. maculatus and An. minimus), to various insecticides was investigated in ten provinces of Lao PDR through a north-south transect. Bioassays were performed on field caught female mosquitoes using the standard WHO susceptibility tests with DDT (4%), deltamethrin (0...
2017: PloS One
https://www.readbyqxmd.com/read/28437324/noncirrhotic-portal-fibrosis-in-pediatric-population
#13
Vikrant Sood, Bikrant B Lal, Rajeev Khanna, Dinesh Rawat, Chhagan Bihari, Seema Alam
OBJECTIVES: Noncirrhotic portal fibrosis (NCPF) has been classically described as a disease of young to middle age with limited literature regarding its occurrence, onset, or clinical presentation in children. We hereby present a series of 19 patients diagnosed and managed as NCPF in pediatric age group. METHODS: A retrospective review of all the patients presenting to the pediatric hepatology department (age <18 years) and diagnosed as NCPF was done and data were evaluated...
May 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28437259/utility-of-esophageal-mucosal-impedance-as-a-diagnostic-test-for-esophageal-disease
#14
Dhyanesh A Patel, Michael F Vaezi
PURPOSE OF REVIEW: The aim of this review is to summarize the use of direct mucosal impedance (MI) for the evaluation and management of esophageal diseases. RECENT FINDINGS: Esophageal multichannel intraluminal impedance with pH (MII-pH) monitoring has been considered the most sensitive test for gastroesophageal reflux disease (GERD), but recent studies have failed to establish impedance parameters that reliably predict treatment response to medical and surgical GERD therapies...
April 21, 2017: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/28437252/valley-filtering-in-graphene-due-to-substrate-induced-mass-potential
#15
D R da Costa, A Chaves, G A Farias, F M Peeters
The interaction of monolayer graphene with specific substrates may break its sublattice symmetry and results in unidirectional chiral states with opposite group velocities in the different Dirac cones (Zarenia et al 2012 Phys. Rev. B 86 085451). Taking advantage of this feature, we propose a valley filter based on a transversal mass kink for low energy electrons in graphene, which is obtained by assuming a defect region in the substrate that provides a change in the sign of the substrate-induced mass and thus creates a non-biased channel, perpendicular to the kink, for electron motion...
April 24, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28437111/mesostructure-of-mesoporous-silica-anodic-alumina-hierarchical-membranes-tuned-with-ethanol
#16
Silo Meoto, Niall Kent, Michael M Nigra, Marc-Olivier Coppens
Hierarchically structured membranes composed of mesoporous silica embedded inside the channels of anodic alumina (MS-AAM) were synthesized using the aspiration method. Ethanol is shown to have a significant effect on the type and organization of the mesoporous silica phase. Detailed textural analysis revealed that the pore size distribution of the mesoporous silica narrows and the degree of ordering increases, with decreasing ethanol concentration used in the synthesis mixture. The silica mesopores were synthesized with pores as small as 6 nm in diameter, with the channel direction oriented in lamellar, circular and columnar directions, depending on the ethanol content...
April 24, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28437019/extending-unique-1d-borate-chains-to-3d-framework-by-introducing-metallic-nodes
#17
Guo-Yu Yang, Qi Wei, Shi-Jia Sun, Jie Zhang
Two novel alkali/alkaline-earth borates, Ba6[B6O9 (OH)6]2(H3BO3) (1) and Li7MAlB12O24 (M = Ba, Sr, Ca) (2a-c), with 1- and 3-D structures have been hydrothermally made and characterized. 1 features a rarely 1-D anionic chain built by hexaborate clusters of B6O11(OH)6 made of six BO4/ BO2(OH)2 tetrahedra. The anionic chains are embedded in the channels of Ba6-based wheel cluster open-framework. On the basis of the structural analyses of 1, by incorporating the rational Al atoms as the linkers and tuning the reaction conditions, the anhydrous borates 2a-c have been success-fully obtained, showing novel 3-D aluminoborates (ABOs) constructed from B6O14-based cluster chains and AlO6 octa-hedra...
April 24, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/28437016/electromechanical-nanogenerator-cell-interaction-modulates-cell-activity
#18
Gonzalo Murillo, Andreu Blanquer, Carolina Vargas-Estevez, Lleonard Barrios, Elena Ibáñez, Carme Nogués, Jaume Esteve
Noninvasive methods for in situ electrical stimulation of human cells open new frontiers to future bioelectronic therapies, where controlled electrical impulses could replace the use of chemical drugs for disease treatment. Here, this study demonstrates that the interaction of living cells with piezoelectric nanogenerators (NGs) induces a local electric field that self-stimulates and modulates their cell activity, without applying an additional chemical or physical external stimulation. When cells are cultured on top of the NGs, based on 2D ZnO nanosheets, the electromechanical NG-cell interactions stimulate the motility of macrophages and trigger the opening of ion channels present in the plasma membrane of osteoblast-like cells (Saos-2) inducing intracellular calcium transients...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28437014/cyclodextrin-films-with-fast-solvent-transport-and-shape-selective-permeability
#19
Luis Francisco Villalobos, Tiefan Huang, Klaus-Viktor Peinemann
This study describes the molecular-level design of a new type of filtration membrane made of crosslinked cyclodextrins-inexpensive macrocycles of glucose, shaped like hollow truncated cones. The channel-like cavities of cyclodextrins spawn numerous paths of defined aperture in the separation layer that can effectively discriminate between molecules. The transport of molecules through these membranes is highly shape-sensitive. In addition, the presence of hydrophobic (cavity) and hydrophilic (ester-crosslinked outer part) domains in these films results in high permeances for both polar and nonpolar solvents...
April 24, 2017: Advanced Materials
https://www.readbyqxmd.com/read/28436964/swell1-is-a-regulator-of-adipocyte-size-insulin-signalling-and-glucose-homeostasis
#20
Yanhui Zhang, Litao Xie, Susheel K Gunasekar, Dan Tong, Anil Mishra, William J Gibson, Chuansong Wang, Trevor Fidler, Brodie Marthaler, Aloysius Klingelhutz, E Dale Abel, Isaac Samuel, Jessica K Smith, Lei Cao, Rajan Sah
Adipocytes undergo considerable volumetric expansion in the setting of obesity. It has been proposed that such marked increases in adipocyte size may be sensed via adipocyte-autonomous mechanisms to mediate size-dependent intracellular signalling. Here, we show that SWELL1 (LRRC8a), a member of the Leucine-Rich Repeat Containing protein family, is an essential component of a volume-sensitive ion channel (VRAC) in adipocytes. We find that SWELL1-mediated VRAC is augmented in hypertrophic murine and human adipocytes in the setting of obesity...
April 24, 2017: Nature Cell Biology
keyword
keyword
6022
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"