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https://www.readbyqxmd.com/read/28438011/electrical-and-optical-properties-of-au-catalyzed-gaas-nanowires-grown-on-si-111-substrate-by-molecular-beam-epitaxy
#1
Chiu-Yen Wang, Yu-Chen Hong, Zong-Jie Ko, Ya-Wen Su, Jin-Hua Huang
In this study, defect-free zinc blende GaAs nanowires on Si (111) by molecular beam epitaxy (MBE) growth are systematically studied through Au-assisted vapor-liquid-solid (VLS) method. The morphology, density, and crystal structure of GaAs nanowires were investigated as a function of substrate temperature, growth time, and As/Ga flux ratio during MBE growth, as well as the thickness, annealing time, and annealing temperature of Au film using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), cathodoluminescence (CL), and Raman spectroscopy...
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/28437999/novel-programmable-microwave-photonic-filter-with-arbitrary-filtering-shape-and-linear-phase
#3
Xiaoqi Zhu, Feiya Chen, Huanfa Peng, Zhangyuan Chen
We propose and demonstrate a novel optical frequency comb (OFC) based microwave photonic filter which is able to realize arbitrary filtering shape with linear phase response. The shape of filter response is software programmable using finite impulse response (FIR) filter design method. By shaping the OFC spectrum using a programmable waveshaper, we can realize designed amplitude of FIR taps. Positive and negative sign of FIR taps are achieved by balanced photo-detection. The double sideband (DSB) modulation and symmetric distribution of filter taps are used to maintain the linear phase condition...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437986/control-and-design-heat-flux-bending-in-thermal-devices-with-transformation-optics
#4
Guoqiang Xu, Haochun Zhang, Yan Jin, Sen Li, Yao Li
We propose a fundamental latent function of control heat transfer and heat flux density vectors at random positions on thermal materials by applying transformation optics. The expressions for heat flux bending are obtained, and the factors influencing them are investigated in both 2D and 3D cloaking schemes. Under certain conditions, more than one degree of freedom of heat flux bending exists corresponding to the temperature gradients of the 3D domain. The heat flux path can be controlled in random space based on the geometrical azimuths, radial positions, and thermal conductivity ratios of the selected materials...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437982/versatile-supercontinuum-generation-in-parabolic-multimode-optical-fibers
#5
M A Eftekhar, L G Wright, M S Mills, M Kolesik, R Amezcua Correa, F W Wise, D N Christodoulides
We demonstrate that the pump's spatial input profile can provide additional degrees of freedom in tailoring at will the nonlinear dynamics and the ensuing spectral content of supercontinuum generation in highly multimoded optical fibers. Experiments and simulations carried out at 1550 nm indicate that the modal composition of the input beam can substantially alter the soliton fission process as well as the resulting Raman and dispersive wave generation that eventually lead to supercontinuum in such a multimode environment...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437978/tunable-optical-cage-array-generated-by-dammann-vector-beam
#6
Xiaoyu Weng, Luping Du, Peng Shi, Xiaocong Yuan
Optical cages attract considerable attentions recently owing to their potential applications in optical trapping, optical imaging and optical cloaking. However, the generation of tunable optical cage arrays in the transverse plane comes to a great challenge, which restricts the effectiveness of the above applications. In this work, we propose a full polarization-controlled method that optical cage arrays with tunable number and positions in the x-y plane can be generated by a so-called Dammann vector beam (DVB), both under the conditions of high- and low-NA focusing system...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437977/polymer-optical-fiber-bragg-grating-inscription-with-a-single-uv-laser-pulse
#7
A Pospori, C A F Marques, O Bang, D J Webb, P André
We experimentally demonstrate the first polymer optical fiber Bragg grating inscribed with only one krypton fluoride laser pulse. The device has been recorded in a single-mode poly(methyl methacrylate) optical fiber, with a core doped with benzyl dimethyl ketal for photosensitivity enhancement. One laser pulse with a duration of 15 ns, which provide energy density of 974 mJ/cm<sup>2</sup>, is adequate to introduce a refractive index change of 0.74×10<sup>-4</sup> in the fiber core. After the exposure, the reflectivity of the grating increases for a few minutes following a second order exponential saturation...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437966/energy-scaling-and-extended-tunability-of-terahertz-wave-parametric-oscillator-with-mgo-doped-near-stoichiometric-linbo-sub-3-sub-crystal
#8
Yuye Wang, Longhuang Tang, Degang Xu, Chao Yan, Yixin He, Jia Shi, Dexian Yan, Hongxiang Liu, Meitong Nie, Jiachen Feng, Jianquan Yao
A widely tunable, high-energy terahertz wave parametric oscillator based on 1 mol. % MgO-doped near-stoichiometric LiNbO<sub>3</sub> crystal has been demonstrated with 1064 nm nanosecond pulsed laser pumping. The tunable range of 1.16 to 4.64 THz was achieved. The maximum THz wave output energy of 17.49 μJ was obtained at 1.88 THz under the pump energy of 165 mJ/pulse, corresponding to the THz wave conversion efficiency of 1.06 × 10<sup>-4</sup> and the photon conversion efficiency of 1...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437955/cyclic-coding-for-brillouin-optical-time-domain-analyzers-using-probe-dithering
#9
Haritz Iribas, Alayn Loayssa, Florian Sauser, Miguel Llera, Sébastien Le Floch
We study the performance limits of mono-color cyclic coding applied to Brillouin optical time-domain analysis (BOTDA) sensors that use probe wave dithering. BOTDA analyzers with dithering of the probe use a dual-probe-sideband setup in which an optical frequency modulation of the probe waves along the fiber is introduced. This avoids non-local effects while keeping the Brillouin threshold at its highest level, thus preventing the spontaneous Brillouin scattering from generating noise in the deployed sensing fiber...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437951/hot-spot-relaxation-time-current-dependence-in-niobium-nitride-waveguide-integrated-superconducting-nanowire-single-photon-detectors
#10
Simone Ferrari, Vadim Kovalyuk, Wladislaw Hartmann, Andreas Vetter, Oliver Kahl, Changhyoup Lee, Alexander Korneev, Carsten Rockstuhl, Gregory Gol'tsman, Wolfram Pernice
We investigate how the bias current affects the hot-spot relaxation dynamics in niobium nitride. We use for this purpose a near-infrared pump-probe technique on a waveguide-integrated superconducting nanowire single-photon detector driven in the two-photon regime. We observe a strong increase in the picosecond relaxation time for higher bias currents. A minimum relaxation time of (22 ± 1) ps is obtained when applying a bias current of 50% of the switching current at 1.7 K bath temperature. We also propose a practical approach to accurately estimate the photon detection regimes based on the reconstruction of the measured detector tomography at different bias currents and for different illumination conditions...
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
#11
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/28437911/investigation-of-third-order-dispersion-of-long-range-surface-plasmon-polariton-waveguides-using-a-hong-ou-mandel-interferometer
#12
Takahide Sakaidani, Ryo Kobayashi, Naoto Namekata, Go Fujii, Daiji Fukuda, Shuichiro Inoue
High-order dispersion of long-range surface-plasmon-polariton waveguides (LR-SPP-WGs) have been investigated using a two-photon interferometer. Since linear and even-ordered dispersions in two-photon interferometry are cancelled out by a nonlocal quantum correlation, odd-ordered dispersions of millimeter-long LR-SPP-WGs are revealed. Even under the highly dispersive condition, the indistinguishability between two photons emerged from LR-SPP-WGs was well preserved. In addition, we demonstrated a strong polarization-selection by the LR-SPP-WGs that leads to the polarization-stable and high-fidelity quantum interference...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437887/influence-of-sinomenine-upon-mesenchymal-stem-cells-in-osteoclastogenesis
#13
Biao Zhou, Xiaolong Lu, Zhi Tang, Dan Liu, Youliang Zhou, Peng Zeng, Hui Xiong
With the advent of aging, the morbidity rates of such diseases as osteoarthritis, rheumatoid arthritis, and osteoporosis has witnessed a significant increase. As a common rattan drug, sinomenine (SIN) has been widely applied for the treatment of various arthritic diseases in traditional Chinese medicine (TCM) clinics. Given that SIN has been reported to inhibit the expression of Prostaglandin E2 (PGE2) in several types of cells, in this study, the influence of SIN treatment on PGE2 expression in mesenchymal stem cells (MSCs), thereby changing the osteoprotegerin (OPG) receptor/activator for the nuclear factor-κ B ligand (RANKL) ratio, was investigated...
April 19, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28437865/a-novel-role-of-astrocyte-elevated-gene-1-aeg-1-in-regulating-non-alcoholic-steatohepatitis-nash
#14
Jyoti Srivastava, Chadia L Robertson, Kareem Ebeid, Mikhail Dozmorov, Devaraja Rajasekaran, Rachel Mendoza, Ayesha Siddiq, Maaged A Akiel, Nidhi Jariwala, Xue-Ning Shen, Jolene J Windle, Mark A Subler, Nitai D Mukhopadhyay, Shah Giashuddin, Shobha Ghosh, Zhao Lai, Yidong Chen, Paul B Fisher, Aliasger K Salem, Arun J Sanyal, Devanand Sarkar
Nonalcoholic steatohepatitis (NASH) is the most prevalent cause of chronic liver disease in the Western world. However, an optimum therapy for NASH is yet to be established mandating more in-depth investigation into the molecular pathogenesis of NASH to identify novel regulatory molecules and develop targeted therapies. Here, we unravel a unique function of Astrocyte elevated gene-1/Metadherin (AEG-1/MTDH) in NASH using a transgenic mouse with hepatocyte-specific overexpression of AEG-1 (Alb/AEG-1) and a conditional hepatocyte-specific AEG-1 knockout mouse (AEG-1(ΔHEP) )...
April 24, 2017: Hepatology: Official Journal of the American Association for the Study of Liver Diseases
https://www.readbyqxmd.com/read/28437861/three-stage-decision-making-model-under-restricted-conditions-for-emergency-response-to-ships-not-under-control
#15
Bing Wu, Xinping Yan, Yang Wang, Di Zhang, C Guedes Soares
A ship that is not under control (NUC) is a typical incident that poses serious problems when in confined waters close to shore. The emergency response to NUC ships is to select the best risk control options, which is a challenge in restricted conditions (e.g., time limitation, resource constraint, and information asymmetry), particularly in inland waterway transportation. To enable a quick and effective response, this article develops a three-stage decision-making framework for NUC ship handling. The core of this method is (1) to propose feasible options for each involved entity (e...
April 24, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28437853/inhibition-of-tgf-%C3%AE-signaling-promotes-expansion-of-human-epidermal-keratinocytes-in-feeder-cell-co-culture
#16
Daisuke Suzuki, Filipa Pinto, Makoto Senoo
Cultured epidermal autografts have been used worldwide since 1981 for patients with extensive third-degree burn wounds and limited skin donor sites. Despite significant progress in techniques toward improving clinical outcome of skin grafts, the long in vitro preparation time of cultured autografts has remained a major factor limiting its widespread use. Here, we show that pharmacological inhibition of TGF-β signaling promotes the expansion of human epidermal keratinocytes (HEKs) with high proliferative potential in co-cultures with both murine 3T3-J2 cells and human feeder cells, including dermal fibroblasts and preadipocytes...
April 24, 2017: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/28437848/inferring-network-structure-in-non-normal-and-mixed-discrete-continuous-genomic-data
#17
Anindya Bhadra, Arvind Rao, Veerabhadran Baladandayuthapani
Inferring dependence structure through undirected graphs is crucial for uncovering the major modes of multivariate interaction among high-dimensional genomic markers that are potentially associated with cancer. Traditionally, conditional independence has been studied using sparse Gaussian graphical models for continuous data and sparse Ising models for discrete data. However, there are two clear situations when these approaches are inadequate. The first occurs when the data are continuous but display non-normal marginal behavior such as heavy tails or skewness, rendering an assumption of normality inappropriate...
April 24, 2017: Biometrics
https://www.readbyqxmd.com/read/28437846/pain-sensitization-is-associated-with-disease-activity-in-rheumatoid-arthritis-patients-a-cross-sectional-study
#18
Yvonne C Lee, Clifton O Bingham, Robert R Edwards, Wendy Marder, Phillips Kristine, Marcy B Bolster, Daniel J Clauw, Larry W Moreland, Bing Lu, Alyssa Wohlfahrt, Zhi Zhang, Tuhina Neogi
OBJECTIVE: Pain sensitization may contribute to pain severity in rheumatoid arthritis (RA), impacting assessment of disease activity. We examined whether pain processing mechanisms were associated with disease activity among RA patients with active disease. METHODS: This study includes 139 subjects enrolled in the Central Pain in Rheumatoid Arthritis cohort. Subjects underwent quantitative sensory testing (QST), including assessment of pressure pain thresholds (PPTs) at multiple sites, conditioned pain modulation, and temporal summation...
April 24, 2017: Arthritis Care & Research
https://www.readbyqxmd.com/read/28437843/a-bayesian-belief-network-model-assessing-the-risk-to-wastewater-workers-of-contracting-ebola-virus-disease-during-an-outbreak
#19
Joseph W Zabinski, Kelsey J Pieper, Jacqueline MacDonald Gibson
During an outbreak of Ebola virus disease (EVD), hospitals' connections to municipal wastewater systems may provide a path for patient waste bearing infectious viral particles to pass from the hospital into the wastewater treatment system, potentially posing risks to sewer and wastewater workers. To quantify these risks, we developed a Bayesian belief network model incorporating data on virus behavior and survival along with structural characteristics of hospitals and wastewater treatment systems. We applied the model to assess risks under several different scenarios of workers' exposure to wastewater for a wastewater system typical of a mid-sized U...
April 24, 2017: Risk Analysis: An Official Publication of the Society for Risk Analysis
https://www.readbyqxmd.com/read/28437818/-towards-a-rehabilitation-and-participation-oriented-psychotherapy
#20
Beate Muschalla, Jürgen Bengel, Matthias Morfeld, Ulrike Worringen
Mental disorders (such as recurrent mood disorders, personality disorders, or psychotic disorders) come along with enduring impairment in daily life activities. Therefore psychotherapeutic actions in inpatient or outpatient settings require a life-span and participation-oriented treatment perspective. Participation-oriented treatment aims at social and vocational integration in general life despite enduringly recurring or resting symptoms. According to the model of health problems offered by the International Classification of Functioning, Disability and Health, ICF (WHO, 2001), disability can be defined as context-dependent activity impairment due to illness...
April 24, 2017: Die Rehabilitation
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