Effect of different clay additions to concrete on its ultrasonic acoustic parameters and compressive strength by Wenxiang Wu, Shunchao Chen, Yong Wu, Xiangyang Zhang, Debiao Kong, Jifeng Wen

“…Specifically, as $$\:{\gamma\:}_{Mc}$$ increases, there is a non-linear relationship between compressive strength and $$\:{\gamma\:}_{Mc}$$ (R²=0.97); When $$\:{\gamma\:}_{Mc}$$ is greater than 10%, the sound velocity and sound time values change significantly, and both show linear and nonlinear relationships with the mud content; As $$\:{\gamma\:}_{Mc}$$ increases, the amplitude also exhibits a nonlinear relationship with $$\:{\gamma\:}_{Mc}$$ (R²=0.91);When $$\:{\gamma\:}_{Mc}$$ is greater than 20%, the frequency value changes significantly and shows a linear relationship with $$\:{\gamma\:}_{Mc}$$ (R²=0.95).In addition, concrete with higher mud content has a longer first wave period, larger waveform spacing, and faster signal attenuation.…”
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Association between vitamin D levels and preserved ratio impaired spirometry: an investigation of mediating roles of systemic inflammation and metabolic indicators by Tong Lin, Shanshan Huang, Fen Zhou, Xingkai Shen, Haiyan Mao

“…RCS analysis showed a nonlinear protective effect of vitamin D, with risk stabilizing at levels above 50 nmol/mL. …”
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Modelación numérica del concreto simple con elementos finitos mediante la teoría de la plasticidad y la función de fluencia de Hu y Schnobrich Numerical modeling of the simple conc... by Luis Rodríguez, Dorian Linero

“…An implicit algorithm of numerical integration was formulated to solve the nonlinear problem given by the material constitutive model. …”
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Optic Nerve Head Hemoglobin Levels in Glaucoma: A Structural and Functional Correlation Study by Janaina A. G. Rocha, Diego T. Dias, Maria Betânia C. Lemos, Fábio N. Kanadani, Augusto Paranhos, Carolina P. B. Gracitelli, Tiago S. Prata

“…We found significant nonlinear correlations between GDF and VFMD values (R2 = 0.295, p<0.001) and between pRNFL thickness and VFMD (R2 = 0.598, p<0.001). …”
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Association of systemic immune-inflammation index (SII) with risk of psoriasis: a cross-sectional analysis of National Health and Nutrition Examination Survey 2011–2014 by Xuan Yang, Yuxin Pan, Yang Zhang, Yang Meng, Tang Tong, Mingyi Zhao

“…We further utilized smooth curve fitting to explore potential nonlinear associations between SII and psoriasis across different subgroups. …”
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Gravitational Collapse and Singularity Removal in Rastall Theory by Ehsan Dorrani

“…In the present work, we study spherically symmetric gravitational collapse of a homogeneous fluid in the framework of Rastall gravity. Considering a nonlinear equation of state (EoS) for the fluid profiles, we search for a class of nonsingular collapse solutions and the possibility of singularity removal. …”
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Multilevel Seismic Damage Behavior Correlation Analysis for RC Framed Structures by Jianguang Yue

“…Five structural levels, that is, material level, section level, member level, storey level, and structure level, were proposed to analyze the multilevel nonlinear mechanism of the reinforced concrete (RC) framed structures. …”
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Effect of time delay on a detritus-based ecosystem by Nurul Huda Gazi, Malay Bandyopadhyay

“…This paper deals with the dynamical analysis of a nonlinear model of a detritus-based ecosystem involving detritivores and predator of detritivores. …”
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Computational Modelling of Blood Flow Development and Its Characteristics in Magnetic Environment by Gopal Chandra Shit

“…The governing coupled nonlinear differential equations of magnetohydrodynamic (MHD) fluid flow are reduced to a nondimensional form, which are then characterized by four dimensionless parameters. …”
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Relativistic Fermion on a Ring: Energy Spectrum and Persistent Current by Sumit Ghosh

“…The energy and persistent current spectra for a relativistic fermion on a ring are studied in detail. The nonlinear nature of persistent current in relativistic regime and its dependence on particle mass and ring radius are analysed thoroughly. …”
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Effect of Ground Motion Directionality on Fragility Characteristics of a Highway Bridge by Swagata Banerjee Basu, Masanobu Shinozuka

“…This procedure uses nonlinear time history analysis and accounts for the effect of directionality in the form of fragility curves. …”
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Anti-Unwinding Attitude Control with Fixed-Time Convergence for a Flexible Spacecraft by Chutiphon Pukdeboon, Anuchit Jitpattanakul

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A novel motion control approach for tethered wheeled mobile robot on extreme terrain by Xiaotao Wang, Xingyu Wang, Jiayou Zhang

“…In the proposed approach, the optimal distribution of the tether tension and the torque to drive the left and right wheels of the tethered robot is obtained based on the minimization of the system power consumption when the robot traveling on the extreme terrains. In addition, a nonlinear disturbance observer is integrated into the dynamic controller to estimate the disturbance from the rugged terrains. …”
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First-Train Timetable Synchronization in Metro Networks under Origin-Destination Demand Conditions by Hetian Chai, Xiaopeng Tian, Huimin Niu

“…Subjected to train operation and connection constraints, a biobjective nonlinear integer programming model is formulated to minimize the total travel time of OD-dependent passenger demands and the deviation between the known and expected schedules. …”
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Spectral study of COVID-19 pandemic in Japan: The dependence of spectral gradient on the population size of the community. by Ayako Sumi, Masayuki Koyama, Manato Katagiri, Norio Ohtomo

“…The results confirm that the power spectral densities (PSDs) of the data from each prefecture show exponential characteristics, which are universally observed in the PSDs of time series generated by nonlinear dynamical systems, such as the susceptible/exposed/infectious/recovered (SEIR) epidemic model. …”
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MAXIMUM POWEWR POINT TRACKING SYSTEM FOR PHOTOVOLTAIC STATION: A REVIEW by I. Elzein

“…Moreover, the solar cell V-I characteristic is nonlinear and varies with irradiation and temperature. …”
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Robust Finite-Time Tracking Control Based on Disturbance Observer for an Uncertain Quadrotor under External Disturbances by Hamid Hassani, Anass Mansouri, Ali Ahaitouf

“…A novel supertwisting nonsingular terminal sliding mode control (STNTSMC) has been developed to ensure that the tracking errors vanish in a short finite-time. A nonlinear disturbance observer (DO) is incorporated into the control system to estimate the unknown external perturbations and to strengthen the system’s robustness. …”
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Finite-Time Admissibility and Controller Design for T-S Fuzzy Stochastic Singular Systems with Distinct Differential Term Matrices by Liang Qiao, Zhaomin Lv

“…When differential term matrices are allowed to be distinct in fuzzy rules, such fuzzy models can describe a wide class of nonlinear stochastic systems. Using fuzzy Lyapunov function (FLF), a new and relaxed sufficient condition is proposed via strict linear matrix inequalities (LMIs). …”
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Self-organization through decoupling by Romar Correa

“…Formally, a conditionally stable nonlinear system of differential equations is examined. …”
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The Comprehensive Study of Electrical Faults in PV Arrays by M. Sabbaghpur Arani, M. A. Hejazi

“…Due to the current-limiting nature and nonlinear output characteristics of PV arrays, faults in PV arrays may not be detected. …”
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