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A four-switch three-phase (FSTP) rotor-side converter (RSC) is proposed in this paper for doubly-fed induction generator based wind turbines (DFIG-WT) to increase the system reliability. The proposed converter topology has satisfactory robustness to open-circuit faults, and it is demonstrated to be feasible under the circumstance of wind speed change. According to different current flow directions,...
In recent years, doublet lens has been used more and more widely in the ideal optical components of confocal 3D imaging due to its high resolution. But for doublet cemented lenses, spherical aberration becomes the biggest barrier to its application. In this paper, based on the formation mechanism of spherical aberration, not only the near and far axis optical path calculation method and equation are...
Polarization imaging technology has shown great advantages in military reconnaissance, vegetation remote sensing and aerosol detection, and the study of the properties of the polarized light transmission can better promote the development of technology. In this paper, according to the characteristics of multi-spectral polarized light transmission in smog environment, an experimental test device of...
A wide variety of lower limb exoskeletons have been applied in the fields of load-carrying augmentation, walking assistance, and rehabilitation training. The traditional exoskeleton based on fully actuated joints can provide powerful assistance for human motion, while it is bulky requiring a large energy consumption, which limits its application. The passive and quasi-passive exoskeletons are weak...
A novel seamless scanning leaky wave antenna in ridge gap waveguide technology is presented. The impedance matching technique is employed to suppress the open-stopband (OSB) which produces a discontinuity for a seamless scanning leaky wave antenna. Ridge gap waveguide proposed recently is used as the feeding structure. The antenna radiates from longitudinal slots of which the leaky constant is designed...
A novel single-layer reflectarray using square spirals is presented in this paper. The square spiral element employs four square spiral arms. By changing the length of the arm, a 450° phase variation range is realized. Besides, the element indicates stable responses for different incidence angles and the reflection phase curve is almost linear. Based on the good phase performance, a square reflectarray...
Resistive Random Access Memory (RRAM) can be regarded as a promising candidate on the manipulation of both electrical and magnetic properties. There is a widespread concern about the electrical manipulation of magnetic properties in RRAM devices. In our work, Co/HfO2/Pt RRAM device with magnetic conductive filament (CF) is designed and fabricated. Then the anisotropic magnetoresistance (AMR) effect...
In recent years, both online retail and video hosting service have been exponentially grown. In this paper, a novel deep neural network, called AsymNet, is proposed to explore a new cross-domain task, Video2Shop, targeting for matching clothes appeared in videos to the exactly same items in online shops. For the image side, well-established methods are used to detect and extract features for clothing...
We report a silicon nitride RF photonic notch filter with unprecedented performance including 8 dB of RF gain, a record-low noise figure of 15.6 dB, and a spurious-free dynamic range of 116 dB while achieving an ultra-deep rejection of beyond 50 dB in the stopbands.
In view of the characteristics of non-silicon flat micro parts in MEMS devices, such as small, light and thin, a vacuum adsorption microassembly system based on microvision was established. Through the research on the key assembly technologies of micro-gripper operation, moving control and micro vision positioning, a general scheme of automatic assembly for flat micro parts is put forward, which is...
We apply interdigitated microelectrode array (IDA) sensors for water quality monitoring. IDA sensors show a linear capacitive response to solution conductivity with no pH sensitivity. Device coated with a ClO− selective layer also detects free chlorine with good sensitivity and specificity over varieties of ions.
Previous studies have shown the WiFi, as the dominant last hop access to Internet, has become the weakest link in the round-trip network delay. Therefore it is critical to understand and minimize the WiFi interference in order to reduce the WiFi hop delay. For the first time in the literature, this paper defines an intuitive and accurate metric to quantify the impact of interference on each actual...
As cutting-edge technology, cluster wells can substantially enhance wells production and oil recovery. Rotating Magnet Ranging System (RMRS) is critical technology to ensure precise ranging and accurate interconnecting target of complex structure wells. The magnetic signal of RMRS is a sinusoidal signal of frequency-varying, narrow band, and its intensity attenuates rapidly with cube of the propagation...
This paper presents a method for the identification of critical locations of power systems using the measurable variables of the active distribution grids. The critical locations are identified using sensitive sparse principal component analysis (SSPCA) where the loadings of some variable in principal components are restricted to zero. SSPCA is tested on the UK 77-bus system. Furthermore, SSPCA and...
This paper investigates the missile attitude control problem. The model used in this paper is with respect to the Euler attitude angles and their derivatives which can be measured and computed easily. A robust practical finite-time control algorithm is proposed based on the terminal sliding mode approach. It is proved that all of the signals in the closed-loop system are bounded and the tracking error...
In this paper, we consider the robust sliding mode control problem for a class of systems with norm bounded parametric uncertainty and external disturbance. Based on Lyapunov stability theory and linear matrix inequality approach, the proposed control scheme can achieve both asymptotic stability and some robust performances, and the corresponding robust controller that assures the occurrence of sliding...
In this paper, the strong controllability of mix-valued logical control networks are investigated. The definition of strong controllability is presented for mix-valued logical control networks. Necessary and sufficient conditions are obtained for the strong controllability of mix-valued logical control networks by the properties of primitive matrices. Numerical examples are given to demonstrate the...
Robotic graspable object recognition is a crucial ingredient in many exciting autonomous manipulation applications. However, identifying complex image features from limited data remains largely unsolved. In this paper, we leverage the advantages of two kinds of feature representation approaches, kernel descriptors and deep neural networks, to present a novel hierarchical feature learning framework...
In this paper, we investigate the robust sampled-data control invariance of Boolean control networks (BCNs) via semi-tensor product of matrices. A necessary and sufficient condition is obtained to check whether or not a given set is robust sampled-data control invariant under a given sampled-data state feedback controller (SDSFC). At last, the study of model about lac operon in the Escherichia coli...
This paper investigates the fault detection problem for a class of networked control systems (NCSs) with state- and disturbance-dependent noises (also called (x, v)-dependent noises) and multiple packet dropouts. The phenomenon of packet dropouts is governed by a diagonal matrix consisting of a series of mutually independent random variables which satisfy binary distributions with possibly different...
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