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This paper presents a study on design parameters of a permanent magnet vernier motor (PMVM), to discuss their influences independently for motor performance improvement, where the electromagnetic torque and torque ripple are mainly taken into consideration. Basic model of the PMVM is designed with dual-stator, axial-flux topology, spoke-type magnets array, which has the feature of high torque density...
This paper is to present an effective wireless power transfer (WPT) system to recharge the battery of electric unmanned aerial vehicle (e-UAV). The proposed system can generate an approximately even magnetic field which allows the e-UAV to get enough energy at different points above the charging pad. Also, based on the design, the proposed system is capable to transmit enough power at a high efficiency...
A wideband omnidirectional dielectric resonator antenna (DRA) has been proposed. The simulated results show that the reflection coefficient of the DRA is less than −10dB in the frequency band of 1.61GHz-2.92GHz (57.8%), which can cover the 2G/3G/LTE bands simultaneously. In order to improve the omnidirectionality of the DRA array, a novel method to arrange the feeding coaxial cable is proposed. Based...
In the present study, Sn0.3Ag0.7Cu spherical solders with diameter in the range of 10∼50 µm were assembled on the flux-coated Cu metallization and then reflowed at temperature of 250°C to form Sn0.3Ag0.7Cu/Cu micro-bump joints, and the size and boundary effects on the growth and morphology evolution of interfacial intermetallic compound (IMC) of micro-bump solder joints were studied. Results show...
To reduce the cost of soldering materials and alleviate the thermal shock of temperature-sensitive electronic components during board-level packaging process, SnBi(Ag) solder pastes were explored to replace SnAgCu solder pastes due to the feature of low melting temperature of SnBi(Ag) solders. In this study, Sn3.0Ag0.5Cu (SAC305) solder balls as IC pins were assembled with SnBi(Ag) solder pastes in...
Constant torque control in machining processes reduces the cycling time and energy consumption, while protecting the machine tool and cutting tool at the same time. This paper presents an adaptive fuzzy control system for optimizing the cutting torque in gear hobbing process. And during the machining process, the input and output scaling factors of the fuzzy controller can also be adjusted automatically...
How to track an arbitrary object in video is one of the main challenges in computer vision, and it has been studied for decades. Based on hand-crafted features, traditional trackers show poor discriminability for complex changes of object appearance. Recently, some trackers based on convolutional neural network (CNN) have shown some promising results by exploiting the rich convolutional features....
We implement a silicon photonic 16-port add-or-drop, with on-chip polarization diversity including polarization splitter rotators and dual switch cores. PDL, DGD of express and add were 0.3dB, <0.1ps and 1.1dB, <3ps respectively. 200Gb/s and 400Gb/s PDM-16QAM signals were transmitted, with 0.1dB ROSNR penalty at 200Gb/s.
Monolithic germanium photodiodes on every cell calibrate a 32×32 silicon photonic switch of 448 Mach-Zehnders in 10 minutes. 64 fibers permanently attached through a waveguide concentrator in a wire-bonded BGA achieve 2.9dB C-band TE fiber-to-die.
A dual-polarized microstrip antenna with low cross polarization level is designed, then a full-polarization conformal phased array with twelve elements on a cylinder is simulated. Based on the embedded patterns of each element, the convex optimization method is utilized to synthesis the array's radiation pattern. It has been proved that, the array with differential-fed elements performs 20dB better...
The paper proposes a fault-tolerant control strategy for a two-phase permanent magnet synchronous motor (PMSM) by a structural alteration. Firstly, a two-phase PMSM is designed with a structure of combination with two conventional single-phase U-core PMSMs. Each has a self-start ability because of the step air gap design on the inner side of stator, and two sets of magnet in the motor are placed as...
Lightpaths are switched in a 32×32 silicon photonic switch, with 448 thermo-optic Mach-Zehnders and 864 monolithic monitor photodiodes. It is packaged in a CBGA with 68-fiber ribbon, and every cell has an off-chip control circuit.
Bone morphogenetic protein (BMP) signaling is essential for neurogenesis and bone formation. Dullard phosphatase functions as a negative regulator of BMP signaling by promoting the dephosphorylation or degradation of BMP receptors. In contrast, dullard regulates nuclear membrane biogenesis. This report aims to characterize dullard and determine the role played by it in cellular signaling.
In this paper, the problem of estimating the motion and shape parameters from the infrared signature of precession object is addressed. To limit the scope of this work, only objects with shape of flat-plane, cone, cylinder, cone-cylinder combination are considered. Different from the current research, the parameter estimating is based on signal modeling. First, a signal model is proposed to approximate...
In the Gaussian mixture model based online writer identification system, the writer specific models are usually learned by adapting the universal background model. However, among all the possible adapting plans, which one performs best is still an unsolved problem, as well as the underlying principles. Towards finding the answer, this paper analyses all the combinations of the parameter adaptation...
To estimate a clone region in a digital image is an important task of copy-move forgery (CMF) detection, which is one of the key techniques of digital image forensics. Most existing keypoint-based CMF detection schemes are weak in distinguishing the clone regions and the similar regions. However, some misjudgments may be resulted in some similar regions, which are not the clone regions. To solve this...
We demonstrate a 2×2 multimode interference coupler in 220 nm silicon photonics, with 3.8 μm by 152 μm footprint. Loss is <0.15±0.01 dB for 1530–1565 nm, across the 200 mm wafer using 248 nm lithography. This is the lowest loss reported for sub-micron silicon 2×2 MMI.
Feature extraction plays an important role in machinery fault diagnosis and prognosis. The features extracted from time, frequency and time-frequency domains are widely investigated to describe the properties of overall signal from different perspectives, seldom considering the sequential pattern of time-series signal in which the fault information may be embedded. This paper investigates a novel...
Focus on solving the Chinese micro blogs sentiment classification issues, a sentiment classification method based on rough set theory has been proposed, rough set theory and sentiment analysis is applied to vector space to find optimal feature set by reducing attributes and get multi-intensity sentiment classification about the micro blogs. This approach decreases the dimension of vector space and...
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