Article
Physics, Fluids & Plasmas
A. C. Quillen, A. Peshkov, Esteban Wright, Sonia McGaffigan
Summary: At high concentration, vinegar eels collectively exhibit metachronal waves near a boundary, with a lower frequency than freely swimming organisms. Models based on a chain of oscillators with nearest-neighbor interactions can mimic this phenomenon and predict wave propagation speed and shape.
Article
Engineering, Electrical & Electronic
Juan Nunez, Jose M. Quintana, Maria J. Avedillo, Manuel Jimenez, Aida Todri-Sanial, Elisabetta Corti, Siegfried Karg, Bernabe Linares-Barranco
Summary: The study focuses on the implementation of oscillatory neural networks using VO2-based nano-oscillators, addressing key issues such as oscillator initialization and frequency synchronization.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2021)
Article
Automation & Control Systems
Hao Jiang, Hongri Gu, Bradley J. Nelson, Teng Zhang
Summary: A computational model is developed to simulate the deformation of single cilium, metachronal wave motion of multiple cilia, and locomotion of magnetic cilia soft robots. The simulations provide insights into the spatial and temporal variation of friction forces and trajectories of cilia tips, contributing to the understanding of metachronal wave-modulated locomotion. The developed model also has the potential to guide the design and optimization of magnetic soft robots.
ADVANCED INTELLIGENT SYSTEMS
(2023)
Article
Mathematics, Applied
Erik T. K. Mau, Michael Rosenblum, Arkady Pikovsky
Summary: Phase reduction is a general approach for describing coupled oscillatory units by focusing on their phases. This paper presents a general framework for obtaining higher-order coupling terms in terms of the coupling parameter for two-dimensional oscillators with arbitrary coupling terms. The theory is applied to accurately predict Arnold's tongue phenomenon for the van der Pol oscillator using higher-order phase reduction.
Article
Physics, Applied
Brooke C. McGoldrick, Jonathan Z. Sun, Luqiao Liu
Summary: The Ising machine is an unconventional computing architecture that can solve combinatorial optimization problems more efficiently than traditional architectures. In this study, we propose using an array of gigahertz spin Hall nano-oscillators to create a fast and compact oscillator network. We develop an analytical framework to understand the relationship between the properties of the coupled oscillators and the Ising model, and integrate it into a versatile Verilog-A device for circuit-level performance analysis. Our research provides insights and tools for designing a CMOS-integrated spin Hall oscillator Ising machine with high efficiency in time, space, and energy.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Fluids & Plasmas
A. C. Quillen
Summary: Biological systems can use the collective formation of a metachronal wave to achieve locomotion and fluid transport. One-dimensional chains of phase oscillators connected in a loop with rotational symmetry can exhibit instability to short wavelength perturbations, leading to changes in the metachronal wave speed. Stochastic phase oscillator models also show that even weak noise can induce instabilities that result in metachronal wave states.
Article
Optics
Dong Hoon Song, Hong-Seok Seo
Summary: Achieving high-power mode-locking in Ti:sapphire lasers is a challenge, but through spectral combination, an output power of 1W and a pulse energy of 14.5nJ have been successfully demonstrated.
Article
Mathematics, Applied
Mariya Savinov, David Swigon, Bard Ermentrout
Summary: The study investigates the entrainment of a nonlinear oscillator by a periodic external force, and explores a two-dimensional map in which the phase and the period update according to the phase of the stimulus. The research found that there is a variety of fixed points and stability levels in different N:M-locking regions, and that the sensitivities of the phase and period to the stimulus, as well as the oscillator's preferred period, can affect the final locking pattern.
Article
Engineering, Electrical & Electronic
Victor Ardila, Franco Ramirez, Almudena Suarez
Summary: This work examines the behavior of a power oscillator that is injection-locked to an external resonator through inductive coupling. It focuses on the effects of the external resonator elements on the locking range, output power, efficiency, and phase noise. Different analytical and simulation-based methods are presented to analyze the impact of the external resonator on the stability and phase noise spectrum. The proposed methods are validated using a Class-E oscillator at 13.56 MHz.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Physics, Multidisciplinary
Isidore Komofor Ngongiah, Balamurali Ramakrishnan, Gaetan Fautso Kuiate, Raphael Tagne, Sifeu Takougang Kingni
Summary: This paper successfully mimics the motion of myriapods by using a combination of mechanical arms and neural circuits. Through numerical simulations, it is found that the neural circuits can be coupled to the mechanical arms and exhibit different states of motion. The communication between neurons does not lose amplitude when they are in the excitable state, similar to the motion of the mechanical legs.
EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS
(2023)
Article
Mathematics, Applied
Mubbashar Nazeer, Farooq Hussain, Sadia Iftikhar, Muhammad Ijaz Khan, K. Ramesh, Nasir Shehzad, Afifa Baig, Seifedine Kadry, Yu-Ming Chu
Summary: Peristaltic transport of couple stress fluid with heat transfer is studied in a channel with flexible walls furnished with hair-like structures. The simultaneous propagation of metachronal waves and peristaltic waves is found to be responsible for the locomotion of biological fluids. The study also highlights the resistive behavior of magnetic fields, viscous dissipation, and entropy generation in the two-dimensional rheological flow. Finally, a closed-form solution for the nonlinear coupled differential equation is achieved, showing the potential for efficiently removing mucus from the lungs and bloodstream through the manufacture of a ciliate bronchial tube.
NUMERICAL METHODS FOR PARTIAL DIFFERENTIAL EQUATIONS
(2021)
Article
Mathematics, Applied
Peter Ashwin, Christian Bick, Camille Poignard
Summary: This paper investigates the phenomenon of dead zones in dynamical systems, exploring conditions under which dead zones can emerge in coupled oscillators and applying these findings to coupled multiscale oscillators. The presence of dead zones in phase interactions functions can lead to interesting dynamical consequences for emergent dynamics.
Article
Physics, Applied
Yuji Nakagawa, Masayuki Takagishi, Naoyuki Narita, Tazumi Nagasawa, Gaku Koizumi, Wenyu Chen, Shohei Kawasaki, Tetsuya Roppongi, Akihiko Takeo, Tomoyuki Maeda
Summary: This study demonstrates the coupled out-of-plane oscillation between two oscillation layers within a spin-torque oscillator (STO). The characteristics of the coupled oscillation state and its degradation due to the mixing of the free oscillation state depending on the bias current are analyzed. The behaviors are described analytically and reproduced numerically based on the Landau-Lifshitz-Gilbert equation. The coupled oscillation state and the subsequent microwave magnetic field can be applied for microwave-assisted magnetic recording for high-density recording as STOs are fabricated in the write head of a hard disk drive.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
H. T. Wu, Lei Wang, Tai Min, X. R. Wang
Summary: This study introduces a new type of synchronization, referred to as dancing synchronization, occurring between two spin-torque nano-oscillators coupled through spin waves. In this synchronized state, the relative phase between the two oscillators varies periodically within a common period, resulting in a dynamic waving pattern. The amplitude of the oscillating relative phase is influenced by the coupling strength of the oscillators and the driven currents, and this dancing synchronization has been found to be universal and applicable to other nonlinear Van der Pol oscillators.
Article
Multidisciplinary Sciences
Brato Chakrabarti, Sebastian Furthauer, Michael J. Shelley
Summary: The study reveals the formation mechanism of metachronal waves generated by motile cilia under the action of internal molecular motors. The research also highlights the important role of boundaries and inhomogeneities in nonuniform ciliary tissues in promoting metachronal waves.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Nanoscience & Nanotechnology
Qinghai Zhang, Lihua Wu, Jianfei Li
Summary: This paper investigates the mechanical properties of unsaturated soil-rock mixtures using micronumerical simulation methods and graphene composite materials. The study finds that graphene composites can significantly improve the toughness of the matrix and are of great significance for improving the landslide environment and understanding the mechanics of landslides.
JOURNAL OF NANOMATERIALS
(2022)
Article
Engineering, Environmental
Shaoxia Lin, Xiaolan Liu, Zhuanling Zhang, Qinghai Zhang
Summary: Caohai Lake in Guizhou Province has high concentrations of heavy metals in sediments, mostly in the residual form. Cd is the main pollution source and poses a high environmental risk. The sediments have mild to moderate toxic effects on benthic organisms. It is important to focus on the stability and passivation of Cd forms.
STOCHASTIC ENVIRONMENTAL RESEARCH AND RISK ASSESSMENT
(2022)
Article
Respiratory System
Yi Tang, Siyuan Tan, Minqi Li, Yijin Tang, Xiaoping Xu, Qinghai Zhang, Qinghua Fu, Mingxiang Tang, Jin He, Yi Zhang, Zhaofen Zheng, Jianqiang Peng, Tengteng Zhu, Wenlin Xie
Summary: Dapagliflozin reduces right ventricular systolic pressure and pulmonary vascular remodeling in a rat model of pulmonary arterial hypertension. However, combination therapy with dapagliflozin and sildenafil was not more effective than monotherapy with sildenafil in pulmonary arterial hypertension rats.
BMC PULMONARY MEDICINE
(2022)
Article
Environmental Sciences
Fumin Li, Shengmei Liao, Yifang Zhao, Xiangxiang Li, Zelan Wang, Chaoxuan Liao, Dali Sun, Qinghai Zhang, Qinhui Lu
Summary: In the karst areas of southwest China, there is significant fluoride contamination in soil and crops, posing a potential health risk to humans, particularly to young individuals. The main exposure route for this risk is soil contact.
Article
Engineering, Mechanical
Jiawei Chen, Chunyu Yu, Qi Cheng, Yuanlin Guan, Qinghai Zhang, Weipu Li, Fuhao Ouyang, Zhenning Wang
Summary: The wear of high-speed trains is inevitable for their braking ability, however, the complex and changeable operating environments make it difficult to research the friction performance of copper-based powder metallurgy brake pads and predict the wear rate. Therefore, this study explores the variations in friction performance of the brake pad under different multi-factors coupling braking conditions and predicts the wear rate using the ASO-BP neural network. The results show that the braking speed and pressure are the main factors affecting the braking ability, with the wear rate prediction accuracy reaching 97.3%.
Article
Environmental Sciences
Guofei Luo, Junxiao Pang, Dali Sun, Qinghai Zhang
Summary: Hexaconazole (Hex) is widely used in agricultural products and its residues pose a potential risk to human health. This study investigated the distribution and toxicokinetic behavior of S-(+)- and R-(-)-Hex in mice using UPLC-MS/MS and molecular docking. The results showed that S-(+)-Hex decreased faster than R-(-)-Hex in most tissues, and Hex accumulated mainly in the liver, kidneys, brain, lungs, spleen, and heart of mice within 96 hours after oral administration.
Article
Environmental Studies
Hua Zheng, Min Guo, Qian Wang, Qinghai Zhang, Noriko Akita
Summary: This study analyzes the knowledge structure and research development related to community gardens by examining 487 published papers. The results show a significant increase in research papers on community gardens since 2012, with the United States contributing the most. High-income countries account for 93.22% of the studies, and there have been 167 collaborations among 38 countries. The study identifies three major research themes in the field: ecosystem services and disservices, multidimensional association, and sustainable garden systems.
Article
Geochemistry & Geophysics
Qinghai Zhang, Lin Ding, Xinming Chen, Gregory A. Brennecka, Yali Sun, Xuesong Ma, Bintao Gao, Qian Zhang, Helmut Willems
Summary: This study reports a decline in 8238U and an increase in Th/U in shallow-marine carbonates during the Paleocene-Eocene thermal maximum in Tingri, south Tibet. The decline in 8238U coincided with a local sea-level fall, while the increase in Th/U occurred mainly during a sea-level rise. These results suggest that changes in local depositional environments can cause behavior of 8238U and Th/U resembling that induced by expanded global oceanic anoxia.
EARTH AND PLANETARY SCIENCE LETTERS
(2023)
Article
Environmental Sciences
Dashuan Li, Chaolian Yang, Xiaomei Xu, Shanghang Li, Guofei Luo, Cheng Zhang, Zelan Wang, Dali Sun, Jianzhong Cheng, Qinghai Zhang
Summary: The study suggests that low dosage of fluoride could be a potential strategy to mitigate the hazardous effects of cadmium exposure in the environment.
ENVIRONMENTAL POLLUTION
(2023)
Article
Food Science & Technology
Na Yang, Junxiao Pang, Zhoubing Huang, Qinghai Zhang, Zelan Wang, Dali Sun
Summary: This study investigated the toxicity effect and mechanism of hexaconazole (HEX) to human breast cancer cells at enantiomer levels. HEX exposure inhibited cell activities and disrupted metabolic pathways. Molecular docking results revealed that CYP17A1 played a key role in endocrine disrupting effects induced by HEX. These findings provide insight into the enantioselective cytotoxicity effect and mechanism of HEX, and contribute to assessing its risk to human health at enantiomer levels.
FOOD AND CHEMICAL TOXICOLOGY
(2023)
Article
Geosciences, Multidisciplinary
Peiping Song, Lin Ding, Liyun Zhang, Fulong Cai, Qinghai Zhang, Zhenyu Li, Houqi Wang, Morteza Khalatbari Jafari, Morteza Talebian
Summary: Two well-dated paleomagnetic poles were discovered in the Urumieh-Dokhtar magmatic arc in Central Iran, indicating that Iran was situated around 3.7 to 3 degrees of latitude south of its present position between 40 to 23 million years ago. The paleomagnetic declination data suggests that the Central Iran block may have undergone an approximately 11.6-degree clockwise rotation since the Late Eocene. The integration of the new data with the retrodeformed margins of the Zagros collision zone and contemporaneous Arabia positions provides a better understanding of the age and configuration of the Arabia and Eurasia assembly process, supporting the Arabia-Eurasia collision as a significant driver of global cooling and regional geological changes.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Engineering, Environmental
Cheng Zhang, Qinghai Zhang, Ming Luo, Qiuping Wang, Xiaomao Wu
Summary: In this study, Bacillus cereus WL08 immobilized on tobacco stem charcoal (TSC) particles was found to rapidly degrade the emerging contaminant butylated hydroxytoluene (BHT) in ecosystems, improving the health of animals, aquatic organisms, and the public. The presence of TSC WL08 in continuous cropping soils also accelerated the degradation of BHT and enhanced the photosynthesis, growth, yield, and quality of Pinellia ternata.
JOURNAL OF HAZARDOUS MATERIALS
(2023)
Article
Plant Sciences
Yuan Tang, Weichang Gao, Yi Chen, Qinghai Zhang, Jianzhong Cheng
Summary: Tobacco biochar (BC) application significantly increased soil N2O emissions due to enhanced soil substrate availability, resulting in aerobic denitrification. Changes in bacterial phylum-level community structure and fungal genus-level structure were observed under BC amendment. The abundance of denitrifying bacteria (Bradyrhizobium and Pseudomonas) and denitrifying fungi (Trichocladium and Trichoderma) significantly increased with BC amendment, contributing to the stimulated soil N2O emissions.
JOURNAL OF SOIL SCIENCE AND PLANT NUTRITION
(2023)
Article
Biochemistry & Molecular Biology
Nghi N. B. Tran, A. T. A. Bui, Valeria Jaramillo-Martinez, Joachim Weber, Qinghai Zhang, Ina L. Urbatsch
Summary: P-glycoprotein (Pgp) is a multidrug transporter that exports hydrophobic compounds out of cells, affecting the bioavailability and pharmacokinetics of drugs. Lipids and cholesterol have been found to modulate the activity of Pgp. However, lipid extracts from different sources are not suitable for biophysical assays. This study investigates how different lipid compositions affect the activity of Pgp and finds that certain lipid mixtures can restore Pgp functionality.
FRONTIERS IN MOLECULAR BIOSCIENCES
(2023)
Meeting Abstract
Biophysics
Theresa Gewering, Deepali Waghray, Kristian Parey, Dovile Januliene, Ina Urbatsch, Arne Moeller, Qinghai Zhang
BIOPHYSICAL JOURNAL
(2023)