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Wireless sensor networks (WSNs) consist of connected low-cost and small-size sensor nodes. The sensor nodes are characterized by various limitations, such as energy availability, processing power, and storage capacity. Typically, nodes collect data from an environment and transmit the raw or processed data to a sink. However, the collected data contains often redundant information. An in-network processing...
The objective of this study is to evaluate the inducing effects of an overhead line hit by lightning on a nearby vehicle. The overhead line includes towers and grounding networks and it is assumed that one tower of the transmission line is subjected to a lightning strike. A full wave analysis method based on an integral formulation of Maxwell's equations is utilized for the determination of the hazardous...
We present a simple mathematical model of the dynamics of impurity distribution in liquid argon detectors. This model considers the dominant sources, sinks, and transport of the impurity between and within the gas and liquid phases of a large detector. We use this model to extract Henry's coefficients for oxygen and water from the time dependence of the impurity concentration in the liquid phase,...
The first ASIC-based Gauss error function (GEF) module is proposed and fabricated in SMIC 180-nm process in this paper. A novel method is proposed to be used in the design. Experimental results show that compared with the design based on Taylor expansion method, the proposed design decreases the absolute error by 99.21%, reduces the area by 77.21% and reduces the delay by 11.96%. It can be used as...
An airborne 2–18 GHz frequency-modulated continuous wave (FM-CW) radar was designed and deployed to Barrow, AK for fine-resolution measurements of snow. In addition to conventional snow thickness measurements as demonstrated in the past, another mission objective is to demonstrate the radar's capability to perform ultra-wideband measurement of snow backscatter at off-nadir angles. The backscatter...
Temporal magnification followed by coherent optical sampling is proposed to enable demultiplexing of 160 Gbaud N-OTDM signal with sampling pulses up to 10.4 ps. Compared with coherent matched sampling, the proposed scheme features better performance with sampling pulse width greater than 6 ps.
This paper presents an improved phased array antenna which is based on the Vivaldi antenna. This phased array antenna has good UWB (ultra-wide bandwidth) characteristics. Meanwhile, its scanning angle has reached to 60 degrees. The length of each radiation unit has been optimized under the application of the low sidelobe algorithm, for the purpose of weakening the sidelobe. By the one-dimensional...
To ensure quality of service (QoS) for heterogeneous traffic in IEEE 802.15.4 based wireless sensor networks (WSNs) is a challenging task since no traffic prioritization mechanism is defined in such WSNs. In this paper, we propose two priority-oriented multicast transmission schemes to provide QoS for heterogeneous traffic in WSNs. Contrary to the legacy CSMA/CA and FIFO principles, these schemes...
This work presents the first in-vivo High-frame rate Contrast Enhanced Ultrasound (HFR CEUS) for cardiac application. The in-vivo acquisition has been made on a sheep. A coherent compounding of diverging waves combined with Pulse Inversion (PI) transmission allow a frame rate of 250 frame per seconds which is 8 times faster than standard CEUS acquisition in cardiac application. The proposed method...
The analysis of trabecular bone micro structure from in-vivo CT images is still limited due to insufficient spatial resolution. The goal of this work is to address both the problem of increasing the resolution of the image and of the segmentation of the bone structure. To this aim, we investigate the joint super-resolution/segmentation problem by an approach based on the Mumford-Shah model. The validation...
Diffusion MRI offers the ability to noninvasively characterize the microstructure of myocardium tissue and detect disease related pathology in cardiovascular examination. This study investigates the feasibility of in vivo cardiac diffusion MRI under free-breathing condition. A high-speed imaging technique, correlation imaging, is used to enable single-shot turbo spin echo for free-breathing cardiac...
Women are at a twofold higher risk of developing major depressive disorder (MDD) than that of men. However, the investigation of female MDD patients functional brain activity is rare and the detailed mechanism remains unclear. The present work is to explore the altered spontaneous neural activity measured with regional homogeneity (ReHo) in female MDD patients using resting-state functional magnetic...
In recent years, the manufacturing industry of distribution transformer (DT) in China has developed rapidly, and the competition is highly. The quality of the DTs was worried, where even using aluminum winding instead of copper winding in DTs without symbol. During the 13th Five-Year Plan period, the investment of distribution network construction will reach 1.7 trillion RMB, which makes a big market...
This paper is concerned with the computation of electromagnetic scattering for multiple cavities which are filled with homogenous material and embedded in the infinite ground plane. Firstly, we focus on a single cavity model. The high order method of moments combined with equivalence principle is proposed to obtain the scattering properties of the cavity. The cavity dynamic Green's function is utilized...
There has been persistent exploration of new active materials and novel device architectures to dynamically control light with larger modulation depth and increased spectral range, at faster speed, and using less power. In this presentation, I will present experimental results showing that samarium nickelate (SmNiO3), a prototypical phase-change perovskite nickelate, exhibits reversible large refractive...
In this paper, strain effects on silicon n-channel gate-all-around (GAA) jucntionless field effect transistor (JLFET) are studied. By using tensile strain SiN layer, drive currents of the JLFETs show enhancement of up to 42%. The high performance strained JLFETs exhibit superior gate control (Ion/Ioff >109) and ideal S.S. (65 mV/dec.) as a channel width scales down to 20 nm. Drive currents and...
Much work has been and is being carried out about the electromagnetic behavior of planar laminates (and in parallel, due to similarities of organization, of some particular photonic crystals) which are involving within each layer a periodic array of commonly orientated fibers, as it is underlined in [1] wherein many references on the topic can also be found, both in electromagnetics (and photonics)...
We present our recent work on fibre-chip grating couplers operating around 1310 nm. For the first time, we demonstrated the combination of dual-etch and apodization design approaches which can offer state of the art performance. Initial tests from fabricated structures show a −2.2dB loss.
This paper presents the implementation of power quality (PQ) analysis platform that can access different venders' PQ meter data being translated to Power Quality Data Interchange Format (PQDIF) files and view the data through a LabVIEW-based graphical user interface. The implemented platform also can manage the retrieved PQ data in a customized database. Performance tests show that the implemented...
A wideband circularly polarized (CP) printed antenna is proposed in this paper. This antenna is evolved from a bow-tie dipole antenna, which have wideband impendence bandwidth (IBW). It uses a configuration of rotational symmetry dipole structure to be radiators. This rotational symmetry structure makes the surface currents to produce a circular polarization wave. A 2×2 antenna array is also designed...
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