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During the summers of 2012 and 2013, field observations of lightning processes were conducted to investigate the characteristics of lightning discharges over a Chinese inland plateau. A total of 17 cloud-to-ground (CG) flashes were recorded by a high-speed video camera in 7 thunderstorm systems. Seven of the CG flashes had two or more contacts: 6 were multiple-channel flashes (MCFs) and 1 was a flash...
This paper provided a detailed review of the newly-published IEC61643-311:2013 “Components for low-voltage surge protective devices -Part 311: Performance requirements and test circuits for gas discharge tubes (GDT)” and IEC 61643-312:2013 “Components for low-voltage surge protective devices -Part 312: Selection and application” by comparing to previous GDT standards. The significant changes in the...
Using the real-time and continuous lightning location data from World Wide Lightning Network (WWLLN) and other data, such as basic information about typhoon and related satellite data from China Meteorological Administration (CMA) to study the distribution and variation of lightning activity in typhoon Morakot. The outer rain band appeared the most lightning. In the period of tropical storm (TS) and...
In this paper, an interface treatment for (100) Ge using HCl cleaning with different concentration and passivation with HCl and NH4F is experimentally demonstrated. The root mean square roughness (Rms) of Ge surface is reduced from 1.95nm to 0.274nm by 36% HCl cleaning, due to the high efficiency to remove the sub-oxide on Ge surface. After the pre-cleaning process, passivation with 10% NH4F achieves...
For the radiated EMI technology of smart grid equipments, the modeling and features on the interference noise are analyzed in this paper. On the basis of radiated EMI mechanism analysis on the electronic equipments, considering of the special features of smart grid, the chip interference mode and structure interference model are established according to the characteristics of radiated electromagnetic...
Deep-sea master-slave hydraulic manipulator is among most commonly tools equipped on remotely-operated vehicles or human occupied vehicles. The design and realization of a 7-Function master-slave hydraulic manipulator can be used in 7000 meters depth is proposed. Linear actuator, rotary actuator and cycloid motor are the three basic modules of the slave arm. A double-screw-pair swing rotary actuator...
To find out the force situation of digging and shoveling bucket and make sure their differences in earth gravity and lunar gravity, a novel discrete element method considering bending and twisting movements and equivalent attraction is employed to build the lunar regolith model and simulate the interaction between soil and tool. To confirm the validity of the model, a triaxial-test is conducted to...
In this paper, we proposed a Medial Axis Distance (MAD) measure for body part detection with single depth image only. First of all, we extracted the skeleton line of human body based on the detected human body silhouette. Using the space information of pixels on the skeleton line and the silhouette, we determined a human body center point on the skeleton line. Then we proposed the MAD measure which...
A novel horizontal polarization sensitive Active Frequency Selective Surface (AFSS) without biasing networks at 2.4GHz WiFi band is presented. The AFSS structure is composed of two mirrored parts and a varactor is set to connect them. Resistors put between the unit cells are used to provide DC connections. No additional biasing networks is required. The structure is sensitive to horizontal polarization...
Action recognition is a challenging topic in computer vision. In this work, we present a novel method for action recognition which is based on two claimed contributions: semantic feature description and cross classification. The designed descriptor is combined by several local 3D-SIFT and is informative and distinctive, reflecting the spatio-temporal clues of the video. The cross classification effectively...
In this paper, a real-time voltage control platform, based-on genetic algorithm (GA) program, is built to optimize a 32-element high gain beam-forming antenna. After 500 generations, S21 has been significantly improved. The gain of the antenna has promoted to 8.95dBi, and the beam-width of the antenna has narrowed down to 30°.
In this paper, we propose a novel evolutionary algorithm with double strategy (DSEA), and prove the asymptotic convergence of DSEA by using the Markov-chain theory. For five high dimension Benchmark functions, the simulation calculation shows that DSEA is superior to PSO and DE, and it is very suitable to solve the global optimization problems.
Gift cards are widely used by many enterprises nowadays for products promotion. Gift cards are used not only for a basket of goods, but also for some specific kinds of goods. In this paper, we characterize consumers' purchasing behavior according to descending consumers' reservation price, then develop a model to derive the optimal purchase amount threshold and gift card value. We find that offering...
This paper discusses the parameter and differentiation order identification of continuous fractional order Hammerstein systems in ARX and OE forms. The least squares method is applied to the identification of nonlinear and linear parameters, in which the Grünwald-Letnikov definition and short memory principle are applied to compute the fractional order derivatives. A P-type order learning law is...
In this paper, a practical Identification strategy is applied to the optimal design of fractional-order iterative learning control (FOILC). The initialized fractional-order gray-box system with commensurate order or non-commensurate order is identified by using the fractional-order iterative learning Identification and the least square or instrumental variable method. The optimal Dα-type FOILC is...
Underwater acoustic communication is paid more and more attention with the development of marine researches in recent years. Underwater acoustic communication channel is considered to be one of the most complicated channels, it suffers from the less available bandwidth, the more serious multipath effect and the even complex noise. Due to the severe distortion of the received signals, the underwater...
This study reports a microfluidic platform for clogging-free electrical property analysis of cancer cells. A pneumatically-driven membrane-based active valve was integrated in this platform to unblock clogging events of constriction microchannels where pneumatic pressures were used to tune the deformation of a polydimethylsiloxan (PDMS) membrane serving as one wall of the constriction microchannel...
Determination of the absolute handedness of single enantiomer at small quantities is essential in chiral drug developments. Here we provide theoretical insights, numerical analysis and experimental demonstrations of high sensitivity to zepto moles of chiral molecules using optical metasurfaces. We introduce a figure of merit (FoM) for metasurfaces that can be extracted from simple far-field scattering...
Accelerometer-based gesture recognition enables natural user interaction of handheld tools with PC and other devices. Dynamic time warping (DTW) can achieve high recognition accuracy and does not require extensive training. However, for applications with noisy data and limited data bandwidth, the performance of DTW algorithm decreases significantly. We propose a new gesture recognition method that...
Transparent Conducting Oxides (TCOs) enable the realization of practical plasmonic and metamaterial devices at the telecommunication frequency due to their low optical loss and CMOS compatibility. By employing a conventional dry-etching process, we have fabricated GZO plasmonic waveplates, which convert linearly polarized light into circularly polarized light.
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