Global analysis on a class of multi-group SEIR model with latency and relapse by Jinliang Wang, Hongying Shu

“…In this paper, we investigate the global dynamics of a multi-group SEIR epidemic model,allowing heterogeneity of the host population, delay in latency and delay due torelapsedistribution for the human population.Our results indicate that when certain restrictions on nonlinear growth rate and incidence are fulfilled, the basic reproduction number $\mathfrak{R}_0$ plays the key role of a global threshold parameter in the sense that the long-time behaviors of the model depend only on $\mathfrak{R}_0$. …”
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The relationship between cardiometabolic Index and diabetic kidney disease in people with diabetes by Jianping Kong, Wenting Tao, Yuhong Sun, Yong Xu, Hailun Li, Jing Li

“…The study employed Generalized Additive Models (GAM) and smooth curve fitting methods for investigating the nonlinear relationship between CMI and DKD. Two-stage regression analysis was applied for investigating threshold effects in the connection between CMI and DKD. …”
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Correlation between Serum Platelet Count and Cognitive Function in Patients with Atrial Fibrillation: A Cross-Sectional Study by Dandan Sun, Quanliang Wang, Jie Kang, Jie Zhou, Ruijuan Qian, Wenqing Wang, Haichen Wang, Qingyun Zhang

“…The effect sizes and the confidence intervals of the left and right sides of the inflection point were 0.03 (0.01–0.05, P for nonlinearity = 0.011) and −0.03 (−0.05–0.00, P for nonlinearity = 0.023), respectively. …”
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Association of TyG index with mortality at 28 days in sepsis patients in intensive care from MIMIC IV database by Heping Xu, Jinyuan Xie, Yan Xia, Huan Niu, Hong Wang, Feng Zhan

“…Our study revealed a nonlinear U-shaped relationship between the TyG index and 28-day all-cause mortality, with a critical point at a TyG index of 9.03. …”
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Modeling and simulations of hydrodynamic shocks in a plasma flowing across randomized ICF scale laser beams by Hüller, S., Ludwig, J. D. T., Rose, H. A., Bruulsema, C., Farmer, W., Michel, P., Milder, A. L., Swadling, G. F., Rozmus, W.

“…The conditions of shock generation are given in terms of the ponderomotive pressure, speckle size and the flow velocity. The nonlinear properties of the shocks are analyzed using Rankine–Hugoniot relations. …”
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Retrieval of Atmospheric CO2 and CH4 Variations Using Ground-Based High Resolution Fourier Transform Infrared Spectra by Tian Yuan, Liu Cheng, Sun You Wen, Xie Pin Hua, Wang Wei, Liu Wen Qing, Liu Jian Guo, Li Ang, Hu Ren Zhi, Zeng Yi

“…The inversion algorithm is based on the nonlinear iterative and nonlinear least squares spectral fitting, which is used to obtain VCDCO2 and VCDCH4 (which represent vertical column density of CO2 and CH4, resp.). …”
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The obesity paradox in osteoporosis risk among older adults is mostly driven by women: a population-based prospective study by Qingfeng Luo, Shiyong Zhang, Zixin Liang, Danni Wang, Yanlin Zhong, Bin Xia, Peng Xie, Can Wang, Jinqiu Yuan, Ziji Zhang, Xingsheng Li

“…Restricted cubic spline (RCS) were used to assess the nonlinear associations of BMI, WC, and fat percentage with OP. …”
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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 between life's essential 8 and Parkinson's disease: a case–control study by Jiaxin Fan, Yanfeng Wang, Xingzhi Guo, Shuai Cao, Shuqin Zhan, Rui Li

“…The sensitivity analysis ensured the robustness of the observed LE8-PD association. A nonlinear relationship (P nonlinearity < 0.01) was observed via RCS analysis. …”
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Age-dependent interaction between serum zinc and triglyceride-glucose index among American adults: National Health and Nutrition Examination Survey by Jun Lai, Jun Lai, Xin-Qing Li, Yinglin Zheng, Zongyan Liu, Qiquan Wu, Yongxiao Cao

“…Additionally, in the fully adjusted analyses, the association between log-transformed serum zinc and TyG in the age &lt;60 years group demonstrated a J-shaped nonlinear pattern (P for nonlinearity = 0.014), with an inflection point at ~1.94 μg/dL. …”
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Damage evolution of slab tracks with complex temperature distribution by Yang Li, Kailin Cao, Jinjie Chen, Haiyan Li, Zhihao Yang, Guocui Wang

“…Results show that: (1) Considering a vertical nonlinearity of 0.3 and a lateral gradient of 10 ℃/m can improve the maximum vertical displacement by 31.6 %. (2) The critical air temperature for interface damage initiation can be approximately 5 ℃ lower when the vertical nonlinearity and the lateral gradient are not considered than when they are considered. …”
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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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Hopf Bifurcation and Control of Magnetic Bearing System with Uncertain Parameter by Jing Wang, Shaojuan Ma, Peng Hao, Hehui Yuan

“…Finally, a hybrid feedback control method (linear feedback control method combined with nonlinear stochastic feedback control method) is introduced to control the Hopf bifurcation behavior of the magnetic bearing system.…”
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Heart rate variability as determinism with jump stochastic parameters by Jiongxuan Zheng, Joseph D. Skufca, Erik M. Bollt

“…We use measured heart rate information (RR intervals) to develop a one-dimensional nonlinear map that describes short term deterministic behavior in the data. …”
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Piecewise-linear companding transform for peak-to-average power ratio reduction of OFDM signals by YANG Pin-lu, HU Ai-qun

“…In order to reduce the peak-to-average power ratio（PAPR） of orthogonal frequency division multiplexing（OFDM） signals,a piecewise-linear companding transform was proposed.Small amplitudes were multiplied by a scale factor,while large ones were not only multiplied by a scale factor but also added by a shift.The resulting companding transform was piecewise-linear and continuous.It can provide significant PAPR reduction performance with low compu-tational complexity,and has low influence on system performances through piecewise transform.It is shown by theoreti-cal analysis and simulation that,a good trade-off between PAPR reduction and bit-error-rate performances can be achieved by carefully choosing the two scales and the shift.Furthermore,compared with existing linear and nonlinear companding transforms,a better power spectral density performance can be achieved.…”
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Onset and termination of oscillation of disease spread through contaminated environment by Xue Zhang, Shuni Song, Jianhong Wu

“…We consider a reaction diffusion equation with a delayed nonlocal nonlinearity and subject to Dirichlet boundary condition. …”
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A MODIFIED SHAKEDOWN ANALYSIS FOR KINEMATIC HARDENING PIPING UNDER THERMAL-MECHANICAL LOAD by HUANG Song, CHEN ZhiPing, LI You

“…The idea is to transfer the nonlinear programming resulting from the shakedown analysis with kinematic hardening and temperature-dependent nature into an elastic perfectly plastic one which can be solved with less effort. …”
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