The Internet of Things (IoT) is a promising paradigm to accommodate massive device connections in 5G and beyond. To pave the way for future IoT, spectrum should be planned advance. Spectrum sharing preferable solution IoT due scarcity available resources. In particular, mobile operators are inclined exploit existing standards infrastructures current cellular networks deploy within licensed spectrum. However, proprietary companies prefer unlicensed avoid any license fee. this article, we...

Due to the lack of efficient light sources compatible with complementary metal oxide semiconductor technology, development silicon-based photonic integrated circuits has been restricted. Germanium (Ge), its small bandgap difference between direct and indirect valleys, becomes a promising candidate for emission when tensile strain is applied modify band structure. However, achieving high uniform in electrically active devices remains challenge. In this work, we present biaxially strained Ge...

A microstrip grid array antenna for 24 GHz Doppler sensor is proposed the first time. It designed on 0.787 mm thick Rogers Duroid 5880 (ε <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> = 2.2 and tan δ 0.0009) with 0.017 copper cladding. Wet etch PCB process used to fabricate cost consideration. Dimensions of are 40 × mm. Simulated results show that impedance bandwidth from 22.7 25.4 GHz, highest gain 17.5 dBi at radiation 22.15 25.5...

CdS nanocrystals have been successfully synthesized by a mechanical alloying process. The X-ray diffraction (XRD) pattern shows that the major phase of product was wurtzite compound after elemental powders for 60 min. All peaks from Cd and S disappeared completely in XRD patterns as-milled ball milled more than 10 h. High-resolution transmission electron microscopy (HRTEM) images confirmed structure nanocrystals. were subsequently capped with trioctylphosphine oxide/trioctylphosphine/nitric...

Accurate acoustic channel models are critical for the study of underwater networks. Existing include physics-based and empirical approximation models. The former enjoy good accuracy, but incur heavy computational load, rendering them impractical in large On other hand, latter computationally inexpensive inaccurate since they do not account complex effects boundary reflection losses, multi-path phenomenon ray bending stratified ocean medium. In this paper, we propose a Stratified Acoustic...

A single feed grid array antenna for 24 GHz Doppler sensor is proposed in this paper. It designed on 0.787 mm thick substrate made of Rogers Duroid 5880 (ε <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> = 2.2 and tan δ= 0.0009) with 0.017 copper claddings. Dimension the 60 × mm. This exhibits 2.08% impedance bandwidth, 6.25% radiation bandwidth 20.6 dBi gain at 24.2 GHz. The beamwidth 14°and 16°in yoz xoz planes, respectively.

A microstrip grid array antenna that radiates a pencil beam is reported. The prototype was designed and fabricated on RT/duriod 5880 substrate with the physical size of 40×40×0.787 mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">3</sup> number 16 radiating elements. Measured results show achieved 4.1% impedance bandwidth 15.5-dBi gain at 24.25 GHz.

The epitaxial growth of GeSn alloys with Sn content varying from 4 to 11% using digermanium (Ge 2 H 6 ) and tin chloride (SnCl as precursors in a modified Chemical Vapor Deposition (CVD) system under reduced pressure condition is reported. Characterization results consisting atomic force microscope (AFM), secondary ion mass spectrometry (SIMS), X-ray diffraction (XRD), etching pits density (EPD) measurements, raman analysis, ellipsometry analysis high-resolution transmission electron...

A microstrip grid array antenna is designed at 24 GHz on a single-layer RT/duriod 5880 substrate with thickness of 0.31 mm. Simulated results show that the achieved 10-dB impedance bandwidth 210MHz, 3-dB gain 500-MHz, and maximum 30.1 dBi 24.15 GHz.

A new type of antenna, called 45° linearly polarized grid array is proposed for 24-GHz automotive radar sensors. Two such antennas are designed and fabricated on RT/duriod 5880 substrate single-ended differential signal operations, respectively. The antenna exhibits 6.8% impedance bandwidth 14-dBi gain the displays 5.9% 13.5-dBi at 24.15 GHz

In view of the abnormal problem insulating oil chromatography data a newly put into operation 220kV transformer, two methods test and high-voltage electrical were used to analyze fault, main transformer fault was located at position bushing joint lead position, determine for installation process quality problems produce magnetic flux leakage, leading thermal cracking occur overheating. According inspection results disassembly returned factory, it determined that cause wrong assembly medium...

Integrated energy system is composed of different multiple systems. When the combined heat and power (CHP) unit fails, more than one systems can be influenced. Therefore, it very important to improve reliability CHP unit. In this paper, we propose a maintenance decision making model for based on opportunistic strategy. Firstly, expression availability considering derived. And then, in order quantify impact strategies operation, operation risk given taking electrical load loss thermal into...

A spinel-structured LiNi 0.5-x Cr 2 x Mn 1 .5 -x O 4 (x=0, 0.05) were prepared via co-precipitation routes. The experiment results from XRD, SEM and electrochemical analyses show that the substitutions of Ni for in LiMn can not prevent 2+ being oxidized into 3+ solution process, however,Mn oxidation does change their final crystal structures spinel phase, but do influence Li/Ni cation mixing occurrence lattice. After substitution first charge discharge capacities decrease its cycleability is...

Currently, many three-phase adjustable speed drivers still use diode rectifiers (DR) or semi-thyristor (SCR) as front-end rectifiers, but this AC-DC rectification brings a large amount of harmonic current, which distorts the grid current. The existing elimination strategy is difficult to apply multi-drive system due high total cost and complexity, so paper proposes new method reduce current in by combining phase-shifting control DC modulation, analyzes effect unequal loads between parallel...

Adjustable speed drives (ASD) are widely used in three-phase multi-drives the industry. For simplicity, practice, front-end rectifier still uses a low-cost, simple control structure diode (DR) or silicon-controlled (SCR). However, non-linearity and time-varying nature of will bring lot harmonic currents to power grid, causing serious pollution. The problem multi-drive system must be solved. existing elimination strategy is difficult apply because high total cost complexity. Therefore, this...

In this paper, an electromechanical coupling analysis method is proposed to analyze the nonlinear response of Broadband dipole antenna under wind load. The structural broadband load carried out by finite element method, and electrical performance moments based on geometric model deformed antenna.

This work investigated effects of different processing methods on the transformation C49-TiSi 2 phase to C54-TiSi in 20nm IMP Ti/Si thin films. A multi-cycle pre-cooling treatment was added titanium silicidation process sequence before rapid thermal annealing (RTA) step. Compared with conventional process, this new method found enhance formation low-resistivity phase. The extent which C49 transformed C54 at 720°C observed increase number cycle. kinetic mechanisms were adopted explain...