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Eunju Hwang
Daily data on COVID-19 infections and deaths tend to possess weekly oscillations. The purpose of this work is to forecast COVID-19 data with partially cyclical fluctuations. A partially periodic oscillating ARIMA model is suggested to enhance the predict...
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Shuo Zhang, Ruquan Liang and Shuo Yang
During the crystal growth process using the floating zone method, the uneven distribution of impurities on the surface of the melt can trigger a coupling mechanism between solutocapillary convection driven by the concentration gradient and thermocapillar...
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Dandan Liu, Yaowen Chang, Lei Sun, Yunpeng Wang, Jiayu Guo, Luyue Xu, Xia Liu and Zhaofei Fan
Uncovering the complex periodic variations in soil moisture can provide a significant reference for climate prediction and hydrological process simulation. We used wavelet analysis to quantify and identify the multi-scale periodic variations of soil mois...
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Shuzong Han, Mingjie Wang and Bo Peng
Typhoons are serious natural disasters in coastal areas. During the summer of 2011, successive typhoons Nesat and Nalgae appeared in the South China Sea, providing a unique opportunity for us to study the response of the upper ocean to successive typhoon...
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Matteo Dellacasagrande, Edward Canepa, Andrea Cattanei and Mehrdad Moradi
The present work reports an experimental study of the leakage flow in a low-speed fan ring. Existing 2D Particle Image Velocimetry (PIV) measurements taken in a meridional plane in front of the rotor gap have been further processed and analyzed by means ...
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Guang Feng, Bingyan Jiang and Yiyao Jiang
The existence of joint clearances in the nose landing gear (NLG) is inevitable and significantly affects shimmy. It was found that the interaction of each joint clearance is closely related to the analysis of shimmy stability. In this study, the shimmy m...
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Muaayed F. Al-Rawi,Izz K. Abboud,Nasir A. Al-Awad
Pág. 16 - 20
This paper examined a novel approach to the DSP of sinusoids with MATLAB using the Discrete Fourier Transform. A sinusoid is a mathematical curve that describes a smooth periodic oscillation, and it can be used to study and solve many real-world problems...
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Fuxing Li and Li He
Wavelet analysis methods (CWT, XWT, WTC) were employed to evaluate the impact of dominant climatic driving factors on summer precipitation in the Beijing area based on monthly precipitation data of Beijing ranging from 1880 to 2014. The two climatic driv...
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Károly Czáder, Kálmán Gábor Szabó
Pág. 63 - 73
The dissolution process of a CO2 gas bubble undergoing adiabatic free oscillation is investigated by coupling bubble dynamics with convective diffusion mass transport in the liquid phase. The minimum equilibrium radius necessary to the adiabatic free osc...
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Feng Zhang, Hao Tang, Nyatchouba Nsangue Bruno Thierry, Wei Liu, Qiuyang Sun, Meixi Zhu, Can Zhang, Xuhao Guo, Chenxu Shan, Liuxiong Xu and Fuxiang Hu
Codends are the posterior components of trawl nets that collect the catch and play a crucial role in the selectivity process. Due to the accumulation of catch and the variety of catch types, the quality of catch and trawl selectivity can be negatively im...
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Chenghua Cong, Honggang Qin and Xingyou Yi
The unsteady characteristics of the second throat of a transonic wind tunnel have an important influence on the design and test of the wind tunnel. Therefore, the forced oscillation characteristics were studied by a numerical simulation method. The gover...
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Jing Guo, Ye Ma, Chao Ding, Huawen Zhao, Zhixin Cheng, Guanxi Yan and Zaijin You
The impact of tidal oscillations on groundwater in coastal reclamation land demonstrates the complex hydrodynamic interaction between seawater and coastal hydrological aquifer systems. The tidal action not only affects the temporal variability of groundw...
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Lujie Xiong, Yanping Jiao, Fengwei Wang and Shijian Zhou
This study utilizes 27 years of sea level anomaly (SLA) data obtained from satellite altimetry to investigate spatial?temporal variations in the South China Sea (SCS). The local mean decomposition (LMD) method is applied to decompose the sea level data i...
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Yonggang Ji, Xu Liang, Weifeng Sun, Weimin Huang, Yiming Wang, Xinling Wang and Zhihao Li
A bistatic high-frequency surface wave radar (HFSWR) with both receiving and transmitting stations placed on different ships (platforms) is a new radar system and referred to as shipborne bistatic HFSWR. In this paper, a first-order ocean surface cross s...
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Guangyu Wang, Shijie Liu, Haoyang Peng and Weidong Liu
A continuous detonation engine with various exhaust nozzles, analogous to typical scramjet cavity combustors with variable rear-wall heights, was adopted to perform a succession of cylindrical air-breathing continuous rotating detonation experiments fuel...
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Xiao Ling, Chenhao Zhou, Lianqiao Yang and Jianhua Zhang
Switched Reluctance Motors (SRMs) have emerged as a viable competitor to other established electrical machines. Although SRMs have many advantages, such as a rare earth free nature, simple structure, high fault tolerance capability and low cost, vibratio...
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Jeffrey Burkhartsmeyer and Kam Sing Wong
Acoustic shockwaves are of interest as a possible means of the selective inactivation of viruses. It has been proposed that such inactivation may be enhanced by driving the virus particles at frequencies matching the characteristic frequency correspondin...
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Edgard Gonzales and Eusebio Ingol
In 2017, extreme rainfall events occurred in the northern portion of Peru, causing nearly 100,000 victims, according to the National Emergency Operations Center (COEN). This climatic event was attributed to the occurrence of the El Niño Southern Oscillat...
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Huan Wang, Erzheng Fang, Mingze Wu, Lianjin Hong and Zongru Li
When an underwater target moves in viscous fluid, it may cause the periodic movement of the surrounding fluid and generate ultra-low-frequency (ULF) gravity waves. The initial domain of the gravitational surface wave propagating above the moving target i...
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Lin Li, David Z. Zhu and Biao Huang
Rapid filling/emptying of pipes is commonly encountered in water supply and sewer systems, during which pressure transients may cause unexpected large pressure and/or geyser events. In the present study, a linearized analytical model is first developed t...
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