Two-Dimensional DOA Estimation for Uniform Rectangular Array Using Reduced-Dimension Propagator Method by Ming Zhou, Xiaofei Zhang, Xiaofeng Qiu, Chenghua Wang

“…The angle estimation error and Cramér-Rao bound (CRB) are derived in this paper. …”
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Simulation Research for the Influence of Mining Sequence on Coal Pillar Stability under Highwall Mining Method by Jing Huang, Fanbao Meng, Ge Wang, Yingkui Wu, Jinhao Wen

“…By adjusting the mining sequence scientifically, the coal pillar failure and roof collapse caused by the deviation of mining angle can be avoided. The results may provide a new angle for the studies on the coal pillar layout and stability design in highwall mining.…”
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Effects of Asymmetries on the Dynamics of Motorized Momentum Exchange Tether and Payloads Injection Precision by Naiming Qi, Yong Yang, Jun Zhao, Qilong Sun, Wenhui Zhang

“…What is more, the structural asymmetries have effects on the attitude elements (including the pitch angle and yaw angle); however, the effects could be weakened by the external torque. …”
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Automatic Extraction of Rock Discontinuities from the Point Cloud Using Dynamic DBSCAN Algorithm by Ming Tang, Song Yang, Guohua Huang, Xiongyao Xie, Jiafu Guo, Junli Zhai

“…Through the 3D printing technology, we have built discontinuity models with different roughness and connectors with different angles. Therefore, we can control the variables in the scanning. …”
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The Aerodynamic Behavioral Study of Tandem Fan Wing Configuration by Du Siliang, Tang Zhengfei

“…The results show that at a certain height, distance, and installation angle, aerodynamic characteristics of a tandem fan wing have more advantages compared to the single fan wing. …”
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Nonlinear Extended Kalman Filter for Attitude Estimation of the Fixed-Wing UAV by Tang Xiaoqian, Zhao Feicheng, Tang Zhengbing, Wang Hongying

“…The unscented Kalman filter (UKF) and cubature Kalman filter (CKF) were designed with different parameterizations of attitude, i.e., Euler angle (EA) and INS/unit quaternion (UQ) simultaneously. …”
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Novel Model for Manoeuvrability of Ships Advancing in Landslide-Generated Tsunamis by Peiyin Yuan, Pingyi Wang, Yu Zhao

“…The correlations between the maximum roll angle and the navigation position, sailing speed, and rudder angle were investigated in detail. …”
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Buckling Instability of Flexible Joint under High Pressure in Solid Rocket Motor by Wang Chunguang, Xu Guiyang, Gong Jianliang

“…The static Riks method and general method were applied, respectively, to simulate the different pressurization processes at different pre-angles to obtain the rules of swing angle changing with pressure. …”
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Simplified Method for Calculating the Active Earth Pressure on Retaining Walls of Narrow Backfill Width Based on DEM Analysis by Minghui Yang, Bo Deng

“…Furthermore, the effects of the width of the backfill, internal friction angle of soil, and wall-soil friction angle on the distribution of active earth pressure are discussed.…”
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Comparative Study of Biotin and Hydroxyapatite on Biological Properties of Composite Coating by Qahtan A. Hamad, Fatimah J. Al-Hasani, Noor K. Faheed

“…In addition, the inclusion of metallic particles has to increase the wettability by reducing the contact angle. At the same time, MTT graphs revealed that after 3 days of exposure in MG-63 cells, 316 L SS alloys’ surface following pack adhesion became more active.…”
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Off-Axial Tensile Properties of Precontraint PVDF Coated Polyester Fabrics under Different Tensile Rates by Lanlan Zhang

“…With off-axial angle increasing, the tensile strength decreases while the strain at break increases. …”
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Wireless Sensor System of UAV Infrared Image and Visible Light Image Registration Fusion by Lei Gu, Juan Meng

“…In simultaneous interpreting two or more multisensor images based on the same scene or target, the image obtained by the UAV sensor is limited by the imaging time and the shooting angle. The images obtained may not be aligned in the spatial position, thus affecting the fusion effect. …”
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Study on dynamics characteristic on combination misalignment and rubbing of the dual-rotor system by YAO Xia, NAN Guofang, LI Yao, QIU Xuewen

“…The misalignment of the dual-rotor system for the aero-engine will lead to abnormal increase of the vibration which results in the rotor-stator rubbing and affects the safty and stability of the rotor operation.The dual-rotor system was taken as the research object.Considering the combination misalignment-rubbing fault, the dynamic model of the rotor system is established based on the lumped mass method.The differential equation of the system motion was established according to the Lagrange equation, and the Range-Kutta method was used to solve it.The influence mechanism of the key parameters such as the speed, the misalignment angle and the coupling misalignment on the nonlinear dynamic characteristics of the system was studied.The results show that the system presents complex dynamic characteristics such as periodic, multi-periodic, quasi-periodic and chaotic motion with the increase of the rotor’s speed.When the speed is in the range of 1 500-2 200 rad/s, the system switches between periodic 2 motion and chaotic state through multiple paroxysmal bifurcations and paroxysmal inverted bifurcations.There are nonlinear phenomena such as jump in the bifurcation diagram of the vibration response with the change of the parallel misalignment of the coupling.As the misalignment angle of the bearing increases, the chaotic interval of the high speed decreases, and the stable periodic motion interval increases.…”
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Experimental and Numerical Study of Strength and Failure Behavior of Precracked Marble under True Triaxial Compression by Yong Han, Yuemao Zhao, Jinglong Li

“…Experimental and numerical results show that both the preferential angle and areal intensity of preexisting cracks can affect the compressive strength and failure behavior of the specimens. …”
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Development and Motion Testing of a Robotic Ray by Jianhui He, Yonghua Zhang

“…The fin undulating motion patterns, fin ray angle, and fin shape to be investigated are briefly introduced. …”
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Multiview ISAR Imaging for Complex Targets Based on Improved SBR Scattering Model by Tiantian Feng, Lixin Guo

“…A novel multiview inverse synthetic aperture radar (ISAR) imaging method is proposed to simulate high-resolution and identifiable ISAR image of complex targets by handling large-angle and wide-bandwidth scattering data. The scattering data are simulated with the shooting and bouncing ray (SBR) method. …”
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Simplified Calculation Method for Seismic Active Earth Pressure of Translational Retaining Wall considering Soil Arching Effect by Zheng-zhen Wang, Rang-cheng Kou, Yong Zhou, Tian-zhong Ma

“…Then, the influence of soil internal friction angle, wall-soil friction angle, and seismic coefficient on seismic active earth pressure theory was analyzed. …”
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Self-Compensation for Disturbances in Differential Vibratory Gyroscope for Space Navigation by Valeriy Chikovani, Olha Sushchenko

“…The condition for the standing wave angle disposition that provides maximum compensation for the disturbances is proposed. …”
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The Molecular Architecture for the Intermediate Filaments of Hard α-Keratin Based on the Superlattice Data Obtained from a Study of Mammals Using Synchrotron Fibre Diffraction by Veronica James

“…High- and low-angle X-ray diffraction studies of hard α-keratin have been studied, and various models have been proposed over the last 70 years. …”
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Two-Dimensional DOA Estimation for Monostatic MIMO Radar with Electromagnetic Vector Received Sensors by Guimei Zheng, Jun Tang

“…Prior knowledge of array elements’ positions and angle searching procedure are not necessary for the proposed 2D-DOA estimation method. …”
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