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Stelios Pitris, George Dabos, Charoula Mitsolidou, Theoni Alexoudi, Peter De Heyn, Joris Van Campenhout, Ronald Broeke, George T Kanellos, Nikos Pleros
We report an 8 × 8 silicon photonic integrated Arrayed Waveguide Grating Router (AWGR) targeted for WDM routing applications in O-band. The AWGR was designed for cyclic-frequency operation with a channel spacing of 10 nm. The fabricated AWGR exhibits a compact footprint of 700 × 270 μm2 . Static device characterization revealed 3.545 dB maximum channel loss non-uniformity with 2.5 dB best-case channel insertion losses and 11 dB channel crosstalk, in good agreement with the simulated results. Successful data routing operation is demonstrated with 25 Gb/s signals for all 8 × 8 AWGR port combinations with a maximum power penalty of 2...
March 5, 2018: Optics Express
Shabir Barzanjeh, Matteo Aquilina, André Xuereb
There has been significant interest recently in using complex quantum systems to create effective nonreciprocal dynamics. Proposals have been put forward for the realization of artificial magnetic fields for photons and phonons; experimental progress is fast making these proposals a reality. Much work has concentrated on the use of such systems for controlling the flow of signals, e.g., to create isolators or directional amplifiers for optical signals. In this Letter, we build on this work but move in a different direction...
February 9, 2018: Physical Review Letters
GiulianoFrancesco Timossi, Antonio Fornieri, Federico Paolucci, Claudio Puglia, Francesco Giazotto
A fundamental aspect of electronics is the ability to distribute a charge current among different terminals. On the other hand, despite the great interest in dissipation, storage and conversion of heat in solid state structures, the control of thermal currents at the nanoscale is still in its infancy. Here, we show the experimental realization of a phase-tunable thermal router able to control the spatial distribution of an incoming heat current, thus providing the possibility of tuning the electronic temperatures of two output terminals...
February 14, 2018: Nano Letters
Binbin Dong, Aifeng Ren, Syed Aziz Shah, Fangming Hu, Nan Zhao, Xiaodong Yang, Daniyal Haider, Zhiya Zhang, Wei Zhao, Qammer Hussain Abbasi
In our daily life, inadvertent scratching may increase the severity of skin diseases (such as atopic dermatitis etc.). However, people rarely pay attention to this matter, so the known measurement behaviour of the movement is also very little. Nevertheless, the behaviour and frequency of scratching represent the degree of itching, and the analysis of scratching frequency is helpful to the doctor's clinical dosage. In this Letter, a novel system is proposed to monitor the scratching motion of a sleeping human body at night...
December 2017: Healthcare Technology Letters
Sanghwa Yoo, Joon Ki Lee, Kwangjoon Kim
We present a simple and effective method for suppressing thermally induced wavelength drift in a widely tunable digital supermode distributed Bragg reflector (DS-DBR) laser monolithically integrated with a semiconductor optical amplifier (SOA). For fast thermal compensation, pre-compensatory currents are injected into the gain medium section of the DS-DBR laser and the SOA. This method can be easily applied to existing commercial tunable lasers, since it is implemented without any modification to manufacturing process...
November 27, 2017: Optics Express
Toshikazu Kuroda
Remote control over devices for experiments may increase the efficiency of operant research and expand the area where behavior can be studied. This article introduces a combination of Raspberry Pi® (Pi) and SoftEther VPN® that allows for such remote control via the Internet. The Pi is a small Linux computer with a great degree of flexibility for customization. Test results indicate that a Pi-based interface meets the requirement for conducting operant research. SoftEther VPN® allows for establishing an extensive private network on the Internet using a single private Wi-Fi router...
November 2017: Journal of the Experimental Analysis of Behavior
Kathleen D Klinich, Miriam A Manary, Laura A Malik, Carol A Flannagan, Jessica S Jermakian
OBJECTIVE: Investigate vehicle factors associated with child restraint tether use and misuse in pickup trucks and evaluate four labeling interventions designed to educate consumers on proper tether use. METHODS: Volunteer testing was performed with 24 subjects and four different pickup trucks. Each subject performed eight child restraint installations among the four pickups using two forward-facing restraints: a Britax Marathon G4.1 and an Evenflo Triumph. Vehicles were selected to represent four different implementations of tether anchors among pickups: plastic loop routers (Chevrolet Silverado), webbing routers (Ram), back wall anchors (Nissan Frontier), and webbing routers plus metal anchors (Toyota Tundra)...
October 30, 2017: Traffic Injury Prevention
Aleksandr Yu Frolov, Niels Verellen, Jiaqi Li, Xuezhi Zheng, Hanna Paddubrouskaya, Denitza Denkova, Maxim R Shcherbakov, Guy A E Vandenbosch, Vladimir I Panov, Pol Van Dorpe, Andrey A Fedyanin, Victor V Moshchalkov
Subwavelength optical resonators and scatterers are dramatically expanding the toolset of the optical sciences and photonics engineering. By offering the opportunity to control and shape light waves in nanoscale volumes, recent developments using high-refractive-index dielectric scatterers gave rise to efficient flat-optical components such as lenses, polarizers, phase plates, color routers, and nonlinear elements with a subwavelength thickness. In this work, we take a deeper look into the unique interaction of light with rod-shaped amorphous silicon scatterers by tapping into their resonant modes with a localized subwavelength light source-an aperture scanning near-field probe...
November 1, 2017: Nano Letters
Ke-Feng Lin, Shih-Sung Lin, Min-Hsiung Hung, Chung-Hsien Kuo, Ping-Nan Chen
BACKGROUND: Local hospitals must deal with large numbers of patients during mass casualty incidents, and the wireless sensor networks (WSNs) can help in these situations by monitoring vital signs. Conventional ZigBee nodes can obtain the ID of a device by assigning a unique 16-bit short address or by burning firmware into an IC. These methods tend to complicate node management and lack portability. OBJECTIVE: The study developed a node management mechanism to deal with a large number of patients in real-time, through the wireless monitoring of physiological signals...
October 13, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
Yu-Yuan Chen, Zhuan-Zhuan Liu, Ren-Gang Wan
We propose a scheme for a beam splitter and a beam router via an electromagnetically induced blazed grating in a four-level double-Λ system driven by an intensity-modulated coupling field and an incoherent pump field. The blazed grating relies on the incoherent pump process, which helps in inducing large refractivity with suppressed absorption or even gain. Consequently, the weak probe beam can be effectively deflected with high diffraction efficiency, and, meanwhile, its energy is amplified. When using an intensity mask with two symmetric domains in the coupling field, the presented blazed grating provides the possibility of a symmetric beam splitter...
July 10, 2017: Applied Optics
Guofang Fan, Regis Orobtchouk, Bing Han, Yuan Li, Hongyu Li
An integrated 8 x 8 wavelength router based on the micro-ring resonators using 2 x 2 multi-interference (MMI) crossing is demonstrated on silicon-on-insulator (SOI) technology, which is manufactured with microelectronics equipment. Experimental results show a free spectral range (FSR) about ~37 nm, an on/off contrast larger than 20 dB, an imbalance among the channels less than 2 dB, a crosstalk of channels smaller than -10 dB, a spacing between close channels about 3.6 ± 0.7 nm and an output efficiency of every channel smaller than 20 dB...
October 2, 2017: Optics Express
Wei Wang, Lu-Qi Wang, Rui-Dong Xue, Hao-Ling Chen, Rui-Peng Guo, Yongmin Liu, Jing Chen
We investigate the excitation and propagation of surface plasmon polaritons (SPPs) at a geometrically flat metal-dielectric interface with a parity-time (PT) symmetric modulation on the permittivity ϵ(x) of the dielectric medium. We show that two striking effects can be simultaneously achieved thanks to the nonreciprocal nature of the Bloch modes in the system. First, SPPs can be unidirectionally excited when light is normally incident on the interface. Secondly, the backscattering of SPPs into the far field is suppressed, producing a radiative-loss-free effect on the unidirectional SPPs...
August 18, 2017: Physical Review Letters
Anna Custo, Dimitri Van De Ville, William M Wells, Miralena I Tomescu, Denis Brunet, Christoph M Michel
Using electroencephalography (EEG) to elucidate the spontaneous activation of brain resting-state networks (RSNs) is nontrivial as the signal of interest is of low amplitude and it is difficult to distinguish the underlying neural sources. Using the principles of electric field topographical analysis, it is possible to estimate the meta-stable states of the brain (i.e., the resting-state topographies, so-called microstates). We estimated seven resting-state topographies explaining the EEG data set with k-means clustering (N = 164, 256 electrodes)...
November 17, 2017: Brain Connectivity
Jonathan L Temte, Shari Barlow, Amber Schemmel, Emily Temte, David L Hahn, Erik Reisdorf, Peter Shult, John Tamerius
INTRODUCTION: The goal of public health infectious disease surveillance systems is to provide accurate laboratory results in near-real time. When it comes to influenza surveillance, most current systems are encumbered with inherent delays encountered in the real-life chaos of medical practice. To combat this, we implemented and tested near-real-time surveillance using a rapid influenza detection test (RIDT) coupled with immediate, wireless transmission of results to public health entities...
September 2017: Journal of the American Board of Family Medicine: JABFM
Bo Han Chen, Pin Chieh Wu, Vin-Cent Su, Yi-Chieh Lai, Cheng Hung Chu, I Chen Lee, Jia-Wern Chen, Yu Han Chen, Yung-Chiang Lan, Chieh-Hsiung Kuan, Din Ping Tsai
Metasurface-based components are known to be one of the promising candidates for developing flat optical systems. However, their low working efficiency highly limits the use of such flat components for feasible applications. Although the introduction of the metallic mirror has been demonstrated to successfully enhance the efficiency, it is still somehow limited for imaging and sensing applications because they are only available for devices operating in a reflection fashion. Here, we demonstrate three individual GaN-based metalenses working in a transmission window with extremely high operation efficiency at visible light (87%, 91...
October 11, 2017: Nano Letters
Siddharth Bhardwaj, Abid Ali Khan
Improperly designed hand tools not only exposes the workers to potential health risks but also hamper their productivity. This study tries to improve the ergonomics of wood routing tasks, suggesting better handle orientations for hand held wood routers. In this study, seven different handle combinations were tested over two routing tasks (beading and dado) in regard with perceived discomfort, electromyography (EMG) of biceps brachi (BB) and extensor carpi radialis brevis (ECRB), and hand-arm vibrations (HAV)...
September 4, 2017: International Journal of Occupational Safety and Ergonomics: JOSE
Rangasamy Prakash, Vijayan Krishnaraj, Redouane Zitoune, Jamal Sheikh-Ahmad
Carbon fiber reinforced polymers (CFRPs) have found wide-ranging applications in numerous industrial fields such as aerospace, automotive, and shipping industries due to their excellent mechanical properties that lead to enhanced functional performance. In this paper, an experimental study on edge trimming of CFRP was done with various cutting conditions and different geometry of tools such as helical-, fluted-, and burr-type tools. The investigation involves the measurement of cutting forces for the different machining conditions and its effect on the surface quality of the trimmed edges...
September 26, 2016: Materials
Thi Thanh An Nguyen, Che-Pin Chang, Shyan-Ming Yuan
With the evolution of the Internet and smartphone devices, Internet advertising has become one of the most important methods for delivering promotional marketing messages to customers. However, the efficiency of Internet advertising for microenterprise is not very high, since Wi-Fi advertising-which is limited by a small router coverage area-is mainly used. Moreover, because of the lack of money, microenterprises have been using low-cost methods to promote their products. Thus, enhancing the effectiveness of Wi-Fi advertising, and solving the problem of cost and the range of the views are now an essential investigation in this study...
July 13, 2017: Sensors
Peter M Wiedemann, Frederik Freudenstein, Christoph Böhmert, Joe Wiart, Rodney J Croft
An implicit assumption of risk perception studies is that concerns expressed in questionnaires reflect concerns in everyday life. The aim of the present study is to check this assumption, i.e., the extrapolability of risk perceptions expressed in a survey, to risk perceptions in everyday life. To that end, risk perceptions were measured by a multidimensional approach. In addition to the traditional focus on measuring the magnitude of risk perceptions, the thematic relevance (how often people think about a risk issue) and the discursive relevance (how often people think about or discuss a risk issue) of risk perceptions were also collected...
June 8, 2017: International Journal of Environmental Research and Public Health
Ghulam Abbas Khan, Changbiao Li, Faizan Raza, Noor Ahmed, Abdul Rasheed Mahesar, Irfan Ahmed, Yanpeng Zhang
We realized an optical transistor and router utilizing multi-order fluorescence and spontaneous parametric four-wave mixing. Specifically, the optical routing action was derived from the results of splitting in the intensity signal due to a dressing effect, whereas the transistor as a switch and amplifier was realized by a switching correlation and squeezing via a nonlinear phase. A substantial enhancement of the optical contrast was observed for switching applications using correlation and squeezing contrary to the intensity signal...
June 14, 2017: Physical Chemistry Chemical Physics: PCCP
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