With the increasing use of electric propulsion ships, emergence shaftless rim-driven thruster (RDT) as a revolutionary integrated motor is gradually becoming an important development direction for green ships. The structure RDTs leads to their dependence on position sensorless control techniques. In this study, novel algorithm using composite sliding mode observer (SMO) with modified feed-forward phase-locked loop (PLL) presented achieving high accuracy and speed RDT motors. deviation...

Retaining a waterproof coal pillar is an important measure to defend against water inrush accidents in mining areas and guarantee the safe of next working face. In this paper, mechanical model established calculation formula width derived. Then, development water-conducting fracture zone overlying rock layer under different widths analyzed using numerical simulation finally, integrity detected geophysical survey method. The main conclusions are as follows: (1) According failure...

Speech Emotion Recognition (SER) plays a significant role in the field of Human–Computer Interaction (HCI) with wide range applications. However, there are still some issues practical application. One is difference between emotional expression amongst various individuals, and another that indistinguishable emotions may reduce stability SER system. In this paper, we propose multi-layer hybrid fuzzy support vector machine (MLHF-SVM) model, which includes three layers: feature extraction layer,...

Abstract The primary aim of this study was to validate predictions human knee-joint contact mechanics (specifically, pressure, area, and force) derived from finite-element models the tibiofemoral patellofemoral joints against corresponding measurements obtained in vitro during simulated weight-bearing activity. A secondary perform sensitivity analyses model calculations identify those parameters that most significantly affect joint force. Joint pressures medial lateral compartments were...

It is proposed that ferromagnetic resonance (FMR) of thin-film ferrites can be utilized to simultaneously improve the radiation efficiency and input impedance matching electrically small antennas (ESAs). To validate concept, role FMR in first derived analytically with an ideal ferrite radiator. was concluded Gilbert damping ferrite, determining quality factor FMR, directly impacts on antenna. A practical example form single-loop antenna loaded a yttrium-iron-garnet (YIG) core. The prototype...

Magnetic materials offer a unique combination of properties for RF applications, such as nonreciprocity, high permeability, broad tunability, strong frequency dispersion, and nonlinearity <xref ref-type="bibr" rid="ref1" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">[1]</xref> , rid="ref2" xmlns:xlink="http://www.w3.org/1999/xlink">[2]</xref> rid="ref3" xmlns:xlink="http://www.w3.org/1999/xlink">[3]</xref> . In contrast to dielectric material,...

Geospatial clustering is an important topic in knowledge discovery research and geospatial information systems. However, current emphasizes the development of more efficient effective methods without paying much attention to domain users' goals during process. Making better use select proper datasets will help achieve results that meet requirements. In this article, we present GEO_CLUST framework for performing clustering. The consists GeoCO ontology reasoner reasoning mechanism. used...

In this paper, a multi-aperture multiplexing multiple-input multiple-output (MAM-MIMO) sparse array is presented for cooperative automotive radars (CARs). The proposed composed of multiple subarrays can simultaneously cover wide field-of-view (FOV) and achieve the required azimuth resolution at different ranges. To validate idea, an optimization model MAM-MIMO derived based on example CARs. This has been found by combining peak-to-sidelobe ratio (PSLR) all beams pointing within constraints...

Filling mining technology is a feasible and effective means to build green mine protect the environment. In order investigate overlying rock movement law of gangue-filling under condition no support for thick coal seams, this paper takes Sima as research object determines relevant parameters mechanics in area through uniaxial compression test, tensile shear which lay foundation numerical simulation similar experiments. The optimal solution was determined by simulation, effects width sequence...

Pipeline conveying is a crucial method for realizing gangue slurry filling. In order to avoid the blockage of in pipeline conveying, it necessary clarify deposition behavior particles pipeline. This paper analyzes coal gangue’s microstructure and mineral composition Zhaozhuang No. 2 mine through electron microscope scanning X-ray diffraction tests. We studied viscosity characteristics at different mass concentrations particle sizes analyzed change rule with time. Based on determining nature...

In wireless ad hoc network communications, both the interference and thermal noise should be considered in receiver design, due to strong impairments each may cause on quality of reception at destination. Since closure under convolution stable distributions only holds for same stability index members, general additive impulsive lighter tailed Gaussian will not result a pattern. It is therefore challenge adequately model distribution such process. this context we consider an optimal design...

This study investigated the heterogeneous Fenton treatment to process coalbed methane-produced water containing fracturing fluid and chose development region of methane in Southern Qinshui Basin as a research area. We synthesized catalyst Fe-Co/γ-Al2O3 by homogeneous precipitation method characterized it BET, XRD, SEM-EDS, FTIR, XPS. Based on degradation rate, we studied influences output parameters, including initial pH, H2O2 concentration, concentration. also impacts overall reaction...

Load forecasting has always been an essential part of power system planning and operation. In recent decades, the competition market requirements renewable integration lead more attention to probabilistic load methods, which can reflect uncertainties through prediction intervals hence benefit decision-making activities in Moreover, with development smart grid metering techniques, companies have collected enormous data about electricity customers substations. The abundant allow us utilize...

Abstract According to complex geological conditions of working face E1108 in Xin-ji mine #2, loading and running characteristic hydraulic support, influence depression angle on mining pressure behaviors, as well relation between advancing speed the support were measured analyzed. The results indicate that is inversely proportional resistance, other words, larger area coincides with lower resistance area. Moreover, generally high when slow. Technologies for controlling stability such...

This paper considers the trajectory tracking problem for a class of automatic straddle carriers (ASCs) with external interferences and overturning constraints. First, steering dynamics ASC are analyzed mathematical model is established. Then, considering impact on accuracy, an improved dynamic Kalman filter designed in order to obtain state estimation ASC. Based obtained estimation, model-predictive control method proposed which takes anti-overturning constraints into account. In addition,...