Hybrid learning in post-pandemic higher education systems: an analysis using SEM and DNN by Alvin Muhammad ‘Ainul Yaqin, Ahmad Kamil Muqoffi, Sigit Rahmat Rizalmi, Faishal Arham Pratikno, Remba Yanuar Efranto

“…The DNN demonstrated its ability to capture complex, nonlinear relationships and provide actionable insights into factors driving student interests. …”
Get full text

Undersampled Blade Tip-Timing Vibration Reconstruction under Rotating Speed Fluctuation: Uniform and Nonuniform Sensor Configurations by Zhongsheng Chen, Jing He, Chi Zhan

“…In order to solve this problem, this paper proposes a new reconstruction method based on nonlinear time transformation (NTT). Firstly, the effects of rotating speed fluctuation on BTT vibration reconstruction are analyzed. …”
Get full text

Experimental Research of the Influence of Microfracture Morphology on Permeability of Shale Rock by Xiaohe Huang, Yunqian Long, Yuyi Wang, Ming Yue

“…The results show that the fracture length and fracture width have a good exponential relationship with the corresponding permeability of the reformed shale rock, and the contribution of the fracture width to shale permeability is much greater than that of the fracture length. In addition, the nonlinear seepage characteristics of shale rock are gradually significant with the reduction of fracture length and fracture width. …”
Get full text

Adsorption of Indigo Carmine onto Chemically Activated Carbons Derived from the Cameroonian Agricultural Waste Garcinia cola Nut Shells and Desorption Studies by Idris-Hermann Tiotsop Kuete, Raoul Donald Tchuifon Tchuifon, Aurelien Bopda, Christian Sadeu Ngakou, George Ndifor-Angwafor Nche, Solomon Gabche Anagho

“…Positive values of ∆Q obtained by the linear and nonlinear forms of the Temkin model indicate the exothermic character of the adsorption process.…”
Get full text

Photoinduced Copolymerization of APMP-MMA: The Role of Reactive Hindered Amine APMP by Ting Zhang, Liuwa Fu, Zhikang Chen, Yanyan Cui, Xiaoxuan Liu

“…According to the reactivity ratios from the extended Kelen-Tüdos (KT) method at high conversion by 1H NMR spectroscopy, a nonlinear model is established and the sequential distribution in the copolymers is also investigated. …”
Get full text

Double Stokes polarimetric microscopy for chiral fibrillar aggregates by Viktoras Mazeika, Kamdin Mirsanaye, Leonardo Uribe Castaño, Serguei Krouglov, Mehdi Alizadeh, Mykolas Maciulis, Lukas Kontenis, Vitalijus Karabanovas, Virginijus Barzda

“…We present a reduced nonlinear polarimetry method named double Stokes polarimetry (DSP) for quick characterization of chiral $$C_6$$ C 6 symmetry fibers without data fitting that simplifies and speeds up the polarimetric analysis. …”
Get full text

On the Experimental Determination of Poisson’s Ratio for Intact Rocks and Its Variation as Deformation Develops by Lu Dong, Hongfa Xu, Pengxian Fan, Zhichou Wu

“…In addition, the average Poisson’s ratio is immune to the nonlinear deformation in the early loading stage. Thus, the average Poisson’s ratio is a better index than the secant Poisson’s ratio in describing the relationship between axial and lateral strains of hard rocks. …”
Get full text

Novel Continuous Terminal Sliding Mode Observer Based Sensorless Speed Control of PMSM Drive System by Abdul Khalique Junejo, Mohsin Ali Koondhar, Rizwan Aziz Siddiqui, Ghulam Sarwar Kaloi, Muhammad Ali Bijarani

“… The permanent magnet synchronous motor (PMSM) control is demanding task because, which is a nonlinear multivariable coupling system. The vector control has been widely used in the control of PMSM system, where the rotor position information is needed for close loop control system. …”
Get full text

Femtosecond System with Pulse Pumping of Seed Laser and Amplifier by Using a Single Power Unit by S. A. Tikhomirov

“…In the developed laser system a compact scheme of a stretcher-compressor with a single common diffraction grating is used.Laser systems of this type characterized by a relatively low cost due to the use of a single power supply unit for simultaneous pumping  of  the  amplifier  and  oscillator,  as  well  as  lower  requirements for the quality of optical elements and usage conditions due to the pulse mode of operation, are quite practical and  can  be  used  both  in  scientific research  in  the  field  of  ultra-high-speed kinetic spectroscopy and nonlinear optics, as well as in numerous technical applications, particular in the precision processing of materials, as optical  simulators  of  the  action  of  heavy  charged  particles  in  testing the radiation resistance of integrated circuits and electronic modules.…”
Get full text

Gamma Precorrection and Phase Error Compensation Methods Based on Three-Frequency with Three-Phase Shift by Wei Feng, Shaojing Tang, Shinan Xu, Tong Qu, Daxing Zhao

“…Considering the phase error caused by the gamma distortion and nonlinear error, the active gamma precorrection and phase error compensation methods based on the three-frequency with three-phase shifts are designed to reversely solve the initial phase and accurately compensate phase error. …”
Get full text

Model of a Photovoltaic Module for the MatLab/Simulink SimPowerSystems Library by D. I. Zalizny

“…The Simulink model of the SF-P672300 module contains 72 nonlinear elements implemented on the basis of controlled current sources and connected in series. …”
Get full text

Multiple symmetry protected BIC lines in two dimensional synthetic parameter space by Zhang Fengyuan, Chu Qiongqiong, Wang Qiang, Zhu Shining, Liu Hui

“…Therefore, our design can provide new insight for a variety of on-chip applications, such as nonlinear devices, integrated nanolasing array, and high-resolution sensors for infrared molecular detection.…”
Get full text

Modeling and Identification of Electromagnetic Actuator for the Control of Rotating Machinery by T.S. Morais, J. Der Hagopian, V. Steffen Jr., J. Mahfoud

“…The system studied has a hybrid bearing that exhibits nonlinear behavior. The system is composed of a horizontal flexible shaft supported by two ball bearings at one end and a roller bearing that is located in a squirrel cage at the other end. …”
Get full text

Accuracy Evaluation and Parameter Analysis of Land Surface Temperature Inversion Algorithm for Landsat-8 Data by Jikang Wan, Min Zhu, Wei Ding

“…The influence of atmospheric water vapor content on SW (LST7) is nonlinear.…”
Get full text

The efficiency of the seismic isolating sliding belt under the impact of the most unfavourable earthquake accelerograms by O. V. Mkrtychev, S. R. Mingazova

“…The objective of the study is to assess the effectiveness of seismic isolation in the form of a sliding belt at the foundation level under the action of the most unfavourable earthquake accelerograms using a direct nonlinear dynamic method.Materials and methods. The study employed a direct dynamic method based on an explicit integration scheme of the equation of motion (the central difference method). …”
Get full text

Mechanical Properties of Paste Slurry under Constant Shear Rate in Initial Structure Failure Process by Chaoqun Dai, Aixiang Wu, Yan Qi, Zhiqiang Chen, Bin Li

“…In the initial structural failure stage, the paste had a nonlinear stress-time relationship. At different shear rates (0.05, 0.5, and 1 s−1), the lower the rotation speed, the smoother the curve, and the slurry at various stages in the yielding process could be more clearly reflected; in the range of low constant shear rate (0.03, 0.05, and 0.07 s−1), the initial stress and yield stress of the paste increased with the increase of shear rate at the same mass concentration, and the time to yield was shorter. …”
Get full text

Smart Frequency Control of a Multicarrier Microgrid in the Presence of V2G Electric Vehicles by Seyed Ali Seyed Beheshti Fini, Seyed Mohammad Shariatmadar, Vahid Amir

“…In a multicarrier network, the frequency is regulated in a nonlinear manner. Meanwhile, new necessary loads for production and electric vehicles have imposed new loads on the power network; if proper management is not performed to respond to these new loads, the increase of network frequency deviations may lead the network to fail and even break down. …”
Get full text

Suppression of Complex Hysteretic Resonances in Varying Compliance Vibration of a Ball Bearing by Zhiyong Zhang, Thomas Sattel, Aditya Suryadi Tan, Xiaoting Rui, Shaopu Yang, Rui Yang, Yongheng Ying, Xuan Li

“…Moreover, the linearized dynamic bearing stiffness of the system will be presented for assessing the locations of VC resonances, and the nonlinear characteristics of bearing stiffness will also be discussed in depth. …”
Get full text

A Space-Vector Analysis of the Twelve-Pulse Diode Bridge Rectifier Operation for the Auxiliary Circuit Current Determination Providing the Optimal Line Currents’ THD by Jaroslaw Rolek, Grzegorz Utrata

“…However, their use causes harmonic distortion in the electric power network line currents due to their nonlinear nature, which, in turn, affects the electric power quality. …”
Get full text

The Behavioral Mechanism and Forecasting of Beijing Housing Prices from a Multiscale Perspective by Yan Li, Zhaoyang Xiang, Tao Xiong

“…According to the complex features of house price, including nonlinear, nonstationary, and multiscale, and considering the remarkable time and frequency discrimination capability of multiscale analysis in dealing with house price problems, we develop an ensemble empirical mode decomposition- (EEMD-) based multiscale analysis paradigm to investigate the behavioral mechanism and then obtain accurate forecasts of house prices. …”
Get full text