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There has been a great development of antenna for synthetic aperture radar (SAR) applications in China in the past dozen years. The active phased array is applied to airborne and space-borne SAR system. As an important component of an array, a brief review on microstrip patch and waveguide slot antenna is presented in this paper mainly.
The back-projection (BP) algorithm is an ideal solution for airborne synthetic aperture radar (SAR) imaging. However, trajectory deviations degrade BP focusing performance dramatically due to the accuracy limitation of navigation system. In this paper, we propose a novel autofocus method compatible with the BP imagery, which can correct the 3D trajectory deviations. In the new method, multiple local...
Short-term load forecast plays a vital role in the electric power industry. In this paper, a deep belief network is proposed for short-term load forecasting. However, the Back-Propagation (BP) algorithm of deep belief network for fine tuning has some inherent drawbacks and limitations, such as slow convergence rate and easy to fall into local minimum. To overcome the drawbacks, several neural network...
This paper propose a mathematical formulation of energy management problem and its implementation in an energy management system (EMS) for isolated neighboring multi-microgrids. Using the model predictive control technique, the optimal operation of the microgrids is determined by utilizing an extended horizon of prediction and evaluation, which allows a proper scheduling of the energy storage units,...
In the paper, an architecture, including a solid state transformer (SST) which is different from the conventional style is proposed The photovoltaic system with SST consists of two power stages. A dual half bridge (DHB) converter constitutes the first power stage, which aims to achieve the maximum power point tracking (MPPT) functions. A grid connected inverter is used to stabilize the DC bus voltage...
Credit data, the data that describes the attributes of customer credit collected by enterprises or institutions, which contains a wealth of credit information, is the important basis of customer credit scoring. Using data mining technology to analyze the credit data and evaluate credit of customer has become a highly efficient method for customer credit estimation. Related research has become a hot...
The paper proposes a robust guidance law with high-order sliding mode variable structure to handle the problems of poor convergence and the control chattering variable structure considering limited guidance information when the target is suffering the high maneuver interception. A sliding surface is illustrated with finite time convergence. The high-order sliding mode variable structure guidance law...
In this paper, the model of photovoltaic panel is built by analyzing the variation of open circuit voltage and short circuit current caused by ambient temperature and radiation intensity fluctuation. Also the current-voltage and power-voltage curves in different radiation intensity and ambient temperature are showed. The influence of radiation intensity and ambient temperature variation for output...
With the benefit of large address space, flexible header extension, high security and mobility, IPv6 is introduced as the next generation Internet protocol. NDP is a necessary part of IPv6 and provides nodes with a method to get the link-local addresses of nodes on the link. NDP has the functions of address resolution, router discovery and duplicate address detection. However, NDP is designed with...
In order to solve the problem of traditional methods having low accuracy in recognizing rolling bearings' faults and to reduce time in building a training model, this paper puts forward a method of recognizing faults based on wavelet packet transformation and PCA-PSO-MSVM. First of all, we extracted the energy values after all kinds of faulty signals have been transformed through wavelet packet, and...
This paper proposes to use multilevel ROI-based features and machine learning method to improve the accuracy of qualitative recognition of mild cognitive disorder in parkinsonism. 77 Parkinson's patients and 32 normal controls with neuropsychological assessments and structural magnetic resonance images from the Parkinson's Progression Markers Initiative dataset are tested. Specifically, the BrainLab...
Exact dynamic analysis of 2–2 cement-based piezoelectric actuator is presented based on the theory of piezo-elasticity in this article with considering ambient temperature. The temperature field considered is assumed to be of uniform distribution over the plate surface. The solution of the piezoelectric composite under sinusoidal electric signal was obtained by using displacement method. The effects...
Gear transmission is a key element in locomotives where it delivers the traction or braking powers between the motor and the wheelset. Its dynamic performance and service reliability have a direct effect on the performance of the locomotive. Gear failures, such as tooth crack and the induced tooth breakage, are likely to deteriorate the dynamic performance of the locomotive or make the train out of...
The initial slope of recovery voltage is an important characteristic quantity, which can reflect polarization property of insulation effectively. Therefore, this paper defines two indexes for analyzing the relationship between initial slope and insulation condition. Two indexes are the ratio of initial slope to peak voltage of recovery voltage under the polarization time, which are called relative...
The Frequency Domain spectroscopy is a nondestructive electric diagnosis. It's very suitable for transformer oil-paper insulation condition of field detection, the actual development of the internal oil paper insulation status can be reflected accurately, especially in the low frequency and the ultra-low frequency. Because of the frequency domain dielectric spectroscopy at low frequency measurement...
Wet mate connectors enable subsea devices to have mutual power and data transfer. Lack of reliability, limited mating and de-mating circulation and complex utilization are the major drawbacks of the conventional contact wet mate connectors. Non-contact power transfer technology has no requirement of electrical contact between power transfer devices, which is more suitable for the subsea occasions...
In this paper, we present the terminal docking experiment of an autonomous underwater vehicle (AUV) based on vision guidance. The configuration of this docking system, including the AUV and the docking system, is proposed. The vision guidance system using one camera and one light is described in detail. The vision based guidance algorithm namely the imaging processing can be divided into 4 stages:...
The recovery voltage method based on the time domain dielectric response, as a non-destructive electrical diagnostic method, is widely used in condition diagnosis of oil-paper insulation power transformers. However, its main characteristics are insufficient to distinguish the respective effects of thermal aging and moisture on oil-paper insulation. At present, some scholars have studied on how to...
This paper introduces novel two-channel a priori Signal-to-Noise Ratio (SNR) estimators for use in frequency-domain speech enhancement algorithms. The SNR estimation is based on statistics of the noisy phase difference between two microphones in each frequency bin. Namely, the corresponding probability distribution is derived assuming a complex Gaussian model, and is written in terms of the SNR only...
Inductive power transfer (IPT) is widely used for the contactless charging system. In an underwater environment, it's also a feasible way to the underwater vehicles for battery charging. In this paper, a novel design process of IPT system is implemented. Serial-serial (SS) topology is selected for the application due to the constant output voltage in a non-resonant state even with a various load....
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