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https://www.readbyqxmd.com/read/28438012/smartphone-based-dual-modality-imaging-system-for-quantitative-detection-of-color-or-fluorescent-lateral-flow-immunochromatographic-strips
#1
Yafei Hou, Kan Wang, Kun Xiao, Weijian Qin, Wenting Lu, Wei Tao, Daxiang Cui
Nowadays, lateral flow immunochromatographic assays are increasingly popular as a diagnostic tool for point-of-care (POC) test based on their simplicity, specificity, and sensitivity. Hence, quantitative detection and pluralistic popular application are urgently needed in medical examination. In this study, a smartphone-based dual-modality imaging system was developed for quantitative detection of color or fluorescent lateral flow test strips, which can be operated anywhere at any time. In this system, the white and ultra-violet (UV) light of optical device was designed, which was tunable with different strips, and the Sobel operator algorithm was used in the software, which could enhance the identification ability to recognize the test area from the background boundary information...
December 2017: Nanoscale Research Letters
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
#2
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/28438003/wavelength-multicasting-through-four-wave-mixing-with-an-optical-comb-source
#3
Hong-Fu Ting, Ke-Yao Wang, Jasper R Stroud, Keith G Petrillo, Hongcheng Sun, Amy C Foster, Mark A Foster
Based on four-wave mixing (FWM) with an optical comb source (OCS), we experimentally demonstrate 26-way or 15-way wavelength multicasting of 10-Gb/s differential phase-shift keying (DPSK) data in a highly-nonlinear fiber (HNLF) or a silicon waveguide, respectively. The OCS provides multiple spectrally equidistant pump waves leading to a multitude of FWM products after mixing with the signal. We achieve error-free operation with power penalties less than 5.7 dB for the HNLF and 4.2 dB for the silicon waveguide, respectively...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437979/30-hz-relative-linewidth-watt-output-power-1-65-%C3%A2%C2%B5m-continuous-wave-singly-resonant-optical-parametric-oscillator
#4
Aliou Ly, Christophe Siour, Fabien Bretenaker
We built a 1-watt cw singly resonant optical parametric oscillator operating at an idler wavelength of 1.65 µm for application to quantum interfaces. The non resonant idler is frequency stabilized by side-fringe locking on a relatively high-finesse Fabry-Perot cavity, and the influence of intensity noise is carefully analyzed. A relative linewidth down to the sub-kHz level (about 30 Hz over 2 s) is achieved. A very good long term stability is obtained for both frequency and intensity.
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437971/energy-efficient-on-chip-optical-diode-based-on-the-optomechanical-effect
#5
Huaqing Qiu, Jianji Dong, Li Liu, Xinliang Zhang
We propose and experimentally demonstrate an energy-efficient optical diode based on the optomechanical effect. The optical signals could transmit during forward propagation while be blocked during backward propagation. When launching optical signal with a low power of 4.0 mW, the maximum resonance red-shift of the asymmetric silicon microring resonator (MRR) could be up to 0.74 nm, in this case, a forward-backward nonreciprocal transmission ratio (NTR) of 12.7 dB has been achieved. The 10-dB and 5-dB operation bandwidths are 0...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437970/cmos-compatible-broadband-co-propagative-stationary-fourier-transform-spectrometer-integrated-on-a-silicon-nitride-photonics-platform
#6
Xiaomin Nie, Eva Ryckeboer, Gunther Roelkens, Roel Baets
We demonstrate a novel type of Fourier Transform Spectrometer (FTS) that can be realized with CMOS compatible fabrication techniques. This FTS contains no moving components and is based on the direct detection of the interferogram generated by the interference of the evanescent fields of two co-propagating waveguide modes. The theoretical analysis indicates that this type of FTS inherently has a large bandwidth (>100 nm). The first prototype that is integrated on a Si<sub>3</sub>N<sub>4</sub> waveguide platform is demonstrated and has an extremely small size (0...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437959/high-average-power-2-%C3%AE-m-femtosecond-optical-parametric-oscillator-synchronously-pumped-by-a-thin-disk-mode-locked-laser
#7
T Petersen, J D Zuegel, J Bromage
A high-energy, extended-cavity femtosecond BiBO optical parametric oscillator synchronously pumped by a 1.0-ps, 1030-nm Yb:YAG, thin-disk pump laser is presented. The oscillator operated near degeneracy in a noncollinear interaction geometry, producing signal wavelength tunability from 1.99 to 2.20 μm. The signal pulses have an average power exceeding 2 W, producing 455-fs pulses at 7.08 MHz with energies up to 350 nJ, showing increased potential for tunable sources of scalable ultrafast pulses in the infrared...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437957/widely-wavelength-tunable-gain-switched-er-sup-3-sup-doped-zblan-fiber-laser-around-2-8-%C3%AE-m
#8
Chen Wei, Hongyu Luo, Hongxia Shi, YanJia Lyu, Han Zhang, Yong Liu
In this paper, we demonstrate a wavelength widely tunable gain-switched Er<sup>3+</sup>-doped ZBLAN fiber laser around 2.8 μm. The laser can be tuned over 170 nm (2699 nm~2869.9 nm) for various pump power levels, while maintaining stable μs-level single-pulse gain-switched operation with controllable output pulse duration at a selectable repetition rate. To the best of our knowledge, this is the first wavelength tunable gain-switched fiber laser in the 3 μm spectral region with the broadest tuning range (doubling the record tuning range) of the pulsed fiber lasers around 3 μm...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437948/uv-sensitive-superconducting-nanowire-single-photon-detectors-for-integration-in-an-ion-trap
#9
D H Slichter, V B Verma, D Leibfried, R P Mirin, S W Nam, D J Wineland
We demonstrate superconducting nanowire single photon detectors with 76 ± 4% system detection efficiency at a wavelength of 315 nm and an operating temperature of 3.2 K, with a background count rate below 1 count per second at saturated detection efficiency. We propose integrating these detectors into planar surface electrode radio-frequency Paul traps for use in trapped ion quantum information processing. We operate detectors integrated into test ion trap structures at 3.8 K both with and without typical radio-frequency trapping electric fields...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437945/experimental-demonstration-of-wideband-multimodule-serial-reflectors
#10
Yeong Hwan Ko, Kyu Jin Lee, Robert Magnusson
We demonstrate unpolarized wideband reflectors fashioned with orthogonal serial resonant reflectors. Unpolarized incident light generates internal TM- and TE-polarized reflections that are made to cooperate to extend the bandwidth of the composite spectral reflectance. The experimental results presented show ~42% band extension by a two-grating module. In addition, good angular tolerance is found because the orthogonal arrangement simultaneously supports classical and fully conic mountings at oblique angles...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437930/si-traceable-measurement-of-an-optical-frequency-at-the-low-10-sup-16-sup-level-without-a-local-primary-standard
#11
Hidekazu Hachisu, Gérard Petit, Fumimaru Nakagawa, Yuko Hanado, Tetsuya Ido
SI-traceable measurements of optical frequencies using International Atomic Time (TAI) do not require a local primary frequency reference, but suffer from an uncertainty in tracing to the SI second. For the measurement of the <sup>87</sup>Sr lattice clock transition, we have reduced this uncertainty to the low 10<sup>-16</sup> level by averaging three sets of ten-day intermittent measurements, in which we operated the lattice clock for 10<sup>4</sup> s on each day. Moreover, a combined oscillator of two hydrogen masers was employed as a local flywheel oscillator (LFO) in order to mitigate the impact of sporadic excursion of LFO frequency...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437927/precision-measurement-of-magnetic-field-based-on-the-transient-process-in-a-k-rb-sup-21-sup-ne-co-magnetometer
#12
Wei Quan, Kai Wei, Hairong Li
We demonstrate a novel method of measuring magnetic field based on the transient signal of the K-Rb-<sup>21</sup>Ne co-magnetometer operating in nuclear spin magnetization self-compensation magnetic field regime. The operation condition for self-compensation magnetic field by nuclear spin magnetization of <sup>21</sup>Ne in steady state is presented. We characterize the dynamics of the coupled spin ensembles by a set of Bloch equations, and formulate the expression of transient output signal...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437922/from-toes-to-top-of-atmosphere-fowler-s-sneaker-depth-index-of-water-clarity-for-the-chesapeake-bay
#13
Benjamin Crooke, Lachlan I W McKinna, Ivona Cetinić
Fowler's Sneaker Depth (FSD), analogous to the well known Secchi disk depth (Zsd), is a visually discerned citizen scientist metric used to assess water clarity in the Patuxent River estuary. In this study, a simple remote sensing algorithm was developed to derive FSD from space-borne spectroradiometric imagery. An empirical model was formed that estimates FSD from red-end remote sensing reflectances at 645 nm, Rrs(645). The model is based on a hyperbolic function relating water clarity to Rrs(645) that was established using radiative transfer modeling and fine tuned using in-water FSD measurements and coincident Rrs(645) data observed by NASA's Moderate Resolution Imaging Spectroradiometer aboard the Aqua spacecraft (MODISA)...
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
#14
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/28437825/-quality-of-life-and-functional-outcome-after-microsurgical-decompression-in-lumbar-spinal-stenosis-a-register-study
#15
Kourosh Zarghooni, Frank Beyer, Joanna Papadaki, Christoph Kolja Boese, Jan Siewe, Gereon Schiffer, Peer Eysel, Jan Bredow
Introduction Because of recent increases in life expectancy, lumbar spinal stenosis (LSS) has become one of the most common degenerative changes in the spine. In patients not responding to conservative therapy, microsurgical decompression is the gold standard of operative treatment for degenerative LSS. The goal of the current study is to evaluate quality of life after microsurgical decompression for LSS, using data from the DWG Register (previously Spine Tango). Methods 36 patients were included in this single-center, prospective, observational study from January 2013 to June 2014...
April 24, 2017: Zeitschrift Für Orthopädie und Unfallchirurgie
https://www.readbyqxmd.com/read/28437820/-therapy-of-hemifacial-spasm-with-botulinum-toxin
#16
Wolfgang H Jost, Rainer Laskawi, Anja Palmowski-Wolfe, Peter P Urban
Hemifacial spasm (HFS) is a frequent disorder characterized by involuntary contractions of those muscles innervated by the facialis nerve on one side of the face. The symptoms can appear as tonic or clonic, intermittent or permanent. Diagnosis is based purely on clinical observation. Differential diagnosis should rely on cranial MRI, which can demonstrate a pathological contact between the nerves and vessels and exclude alternative causation. Often, the symptoms are not marked so that therapy may not be necessary...
April 2017: Fortschritte der Neurologie-Psychiatrie
https://www.readbyqxmd.com/read/28437812/infection-rate-in-1033-elective-neurosurgical-procedures-at-a-university-hospital-in-south-china
#17
Hongwei Zhu, Xiyao Liu, Zhanxiang Wang
Objective Infection following surgery is a serious complication, especially in neurosurgery. The aim of the study is to report the change of incidence rates of infection in patients undergoing elective neurosurgical procedures at a university hospital in South China as well as the risk factors. Material and Methods The medical records and postoperative courses for patients undergoing 1,033 neurosurgical procedures from 2008 to 2014 were reviewed retrospectively to determine the incidence of neurosurgical infection, the identity of the offending organisms, and the factors associated with infection...
April 24, 2017: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28437811/symptomatic-outcome-after-bone-only-suboccipital-decompression-in-adult-patients-with-chiari-type-i-malformations-in-the-absence-of-hydromyelia-or-hydrocephalus
#18
Nicolas Olmo Koechlin, Hazem J Abuhusain, Manuri Gunawardena, Tyler S Auschwitz, Charles Teo
Background Type I Chiari malformation presents without an associated hydromyelia in 30 to 70% of cases, yet there is no agreement regarding the optimal surgical treatment for these patients. We review our experience for treating symptomatic adult type I Chiari malformation without hydromyelia using a suboccipital bone decompression of the hindbrain and no duraplasty in 12 adult patients. Outcome was measured according to the Chicago Chiari Outcome Scale (CCOS). Results Nine of 12 patients were female; average age at surgery was 34...
April 24, 2017: Journal of Neurological Surgery. Part A, Central European Neurosurgery
https://www.readbyqxmd.com/read/28437787/a-comparison-of-three-different-volumes-of-levobupivacaine-for-caudal-block-in-children-undergoing-orchidopexy-and-inguinal-hernia-repair
#19
Vesna Marjanovic, Ivana Budic, Marija Stevic, Dusica Simic
OBJECTIVE: The aim of this study was to compare the efficacy of three different volumes of 0.25% levobupivacaine caudally administered on the effect of intra- and post-operative analgesia in children undergoing orchidopexy and inguinal hernia repair. SUBJECTS AND METHODS: Forty children, aged 1 to 7 years, American Society of Anesthesiologists (ASA) physical status I and II, were randomized into 3 different groups according to the applied volumes of 0.25% levobupivacaine: group 1 (n=13): 0...
April 23, 2017: Medical Principles and Practice: International Journal of the Kuwait University, Health Science Centre
https://www.readbyqxmd.com/read/28437759/correlation-of-technical-surgical-goals-to-the-gdi-and-investigation-of-post-operative-gdi-change-in-children-with-cerebral-palsy
#20
Christina Bickley, Judi Linton, Nancy Scarborough, Elroy Sullivan, Katy Mitchell, Douglas Barnes
AIM: The purpose of this study was to introduce a standardized set of surgical technical achievement goals (TAGs) as part of a comprehensive outcome assessment model for children with spastic cerebral palsy (CP) undergoing orthopaedic surgical intervention to improve gait. Examination of relationships of these surgical goals to the Gait Deviation Index (GDI) and use of two assessments in tandem provided a thorough picture of technical surgical outcomes. This study also investigated changes in GDI in children with spastic CP after surgery...
April 13, 2017: Gait & Posture
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