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A coherent multi-wavelength Brillouin random fiber laser with randomly distributed Rayleigh scattering feedback was demonstrated. Up to six orders Stokes random lasing radiations were generated with an unprecedented high optical signal-to-noise ratio of ∼47dB.
We report that transmission of pulses in tapered dual-core As2Se3-PMMA fibers induces permanent effective group-velocity matching between the field propagating in the fiber.
In order to ensure the safe and economic operations of thermal power plants, heater water levels of high pressure (HP) and low pressure (LP) heaters are important process variables to be monitored in industrial alarm systems. This paper proposes multiple factors affecting heater water levels, and the ways performing the root cause analysis for corresponding alarms. Combining with the operating data...
In order to improve the accuracy of SOC estimation for vehicle battery pack and optimize the management of the battery system, a new method based on deep belief network for remote correction of SOC accuracy is proposed in this paper. The monitoring data obtained by the remote monitoring center of the electric vehicle should be pre-processed before the establishment of deep belief network, which is...
This paper presents the cooperative control design for multiple nonholonomic robots. The control objective for the multi-robot system is to rotate around the moving target with the desired radius and equal angle spacing of inter-robot. The distributed control law in the global coordinate frame is proposed using backstepping techniques to achieve asymptotic convergence to the desired motion. Under...
With the rapid development of interconnections of regional power network, wind power and photovoltaic power etc. new energy connected to power grid, it poses a huge challenge to power grid control systems. The frequency stability and main ways of dealing with the instantaneous power gap in the power grid mainly depends on primary frequency compensation(PFC) based on thermal power units. By analyzing...
Vessel's trajectory information extracted from AIS (Automatic Identification System) data plays an important role in the field of vessel collision avoidance, navigation, water traffic state analysis, etc. The missing information in vessel's trajectory having a marked impact on research work and decision making is ought to be restored as soon as possible consequently. In view of this situation, an...
Promotion of the shipping informatization for the Yangtze River increased the amount of shipping data sources for the Yangtze River. Quality assessment for data sources is a basic issue of data quality management. Considering knowledge of the professional field and users' data needs would make results of quality assessment have better availability. This article constructed a quality assessment system...
Vehicle recognition has become a hotpot in the researches on intelligent traffic management system. In the vehicle identification, the collision information is fused using the combination rule of Dempster-Shafer evidence, and the irregular results will be occurred. It is discussed that a new calculation method of weight coefficient in this thesis. In this method, the evidence principal elements for...
As one kind with the best comprehensive performance of various honeycombs, triangular honeycomb is an important structure to achieve lightweight. Focusing on the deficiency of the non-optimized macro-material distribution in uniform triangular honeycomb, a design and modeling method of variable-density triangular honeycomb structures was proposed. With a three-point bending beam as the design object,...
Micro Energy internet generally refers to energy system with multi-energy synergism, is achieved through energy conversion, storage, demand response and other technologies, realizes coupling energy and information deeply. This paper introduces a stochastic optimal operation model of micro Energy Internet contains CCHP system and rooftop PV modules. A representative scenarios method is used to describe...
Porcelain long rod insulators are widely used in transmission lines while many of their features are lack of research. To determine the voltage and electric field distribution of porcelain long rod insulators helps to guide the existing operational strategy. In accordance with the insulator structure and the actual working conditions, the simulative calculation of porcelain long rod insulator string...
Object tracking under complex circumstances remains to be a challenging problem because the appearance of an object can be drastically changed by illumination variations, pose variations and occlusion. This paper proposes an adaptive multiCfeature fusion strategy, in which the target appearance is modeled based on timed motion history image with HSV color histogram feature and edge orientation histogram...
A modified control approach combined with Input-output linear algorithm and adaptive fuzzy sliding mode algorithm is proposed to adapt the non-linear and time-varying nature of vehicle's lateral control. In order to design the controller, this paper changed the nonlinear control model to a linear form using Input-output linear algorithm. And fuzzy sliding mode control method is introduced to the algorithm...
This paper presents a deep neural network-based protein-protein interactions (PPIs) information extraction approach which can learn complex and abstract features automatically from unlabeled data by unsupervised representation learning methods. This approach first employs the training algorithm of auto-encoders to initialize the parameters of a deep multilayer neural network. Then the gradient descent...
The input and output characteristic of thermocouple vacuum gauge exhibits high nonlinearity, which comes from the gauges' inherent physical peculiarities and causes big error in measurement results. There is a need to make compensation of the nonlinearity for accurate measurement. In this article, a least squares support vector machine (LS-SVM) model is developed to function as a compensator with...
Measuring the leakage current of insulator surface is an implementable and effective method to evaluate the insulator contamination. This paper proposed a portable leakage current monitoring system for site outer insulation studies. Difference mode has been applied in this system for common mode signal reduction. The synchronous sampling rate can reach 20kS/s, which can record full information in...
Except from the two basic and conventional contamination accumulation modes, the common slow solid mode and the rapid liquid mode, there is another kind of rapid contamination accumulation mode which is even easier to cause the pollution-flashover. It is related to human activities, such as burning straw and setting off firecrackers, or natural factors as forest fire and acid rain. Those factors result...
With the development of network communicationtechnology, combination between network and automotiveelectronics industry has more and more extensively. The mainpoints on performance evaluation for this kind of multi-functionnetwork are bandwidth, resource utilization, security andreliability. Through the analysis of automotive electronicsnetwork topology and characteristic information transmissionpattern,...
Thermal barrier coating is a widely used advanced manufacturing technique. This paper introduces an image analysis based automated thermal barrier coating porosity measurement (TBCPM) framework. The proposed automated image analysis framework consists of two modules, including 1) top coat layer detection module, and 2) microstructure recognition and porosity measurement module. The first module is...
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