Article
Nanoscience & Nanotechnology
Paul Wrede, Amirreza Aghakhani, Ugur Bozuyuk, Erdost Yildiz, Metin Sitti
Summary: Microparticle manipulation and trapping are crucial in biotechnology. This study proposes the use of hollow borosilicate microparticles and a single-lens focused ultrasound (FUS) transducer for effective manipulation. The method proves effective under realistic flow rates and ultrasound amplitudes and has potential biomedical applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Biochemical Research Methods
Guangxing Wu, Serene Wen Ling Ng, Yan Zhou, Minghui Hong
Summary: Optical microscopic techniques are crucial for observing and extracting dynamic information from micro/nano-scale samples in microfluidic devices in biology and chemistry fields. However, current microfluidic imaging schemes face challenges in achieving high spatial and temporal resolutions simultaneously. The emergence of microsphere nanoscope offers a potential solution to address these challenges, with its high spatial resolution, real-time imaging abilities, and cost-effectiveness. In this study, a microsphere compound lens integrated microfluidic imaging device is proposed for real-time super-resolution imaging. The device exhibits superiority over single microsphere and conventional optical microscopes in discerning nano-objects beyond the diffraction limit and generating magnified images. Additionally, the device is experimentally demonstrated to be applicable in nanoparticle tracing and live-cell monitoring.
Article
Environmental Sciences
Sulagna Mishra, Uli Kluemper, Veiko Voolaid, Thomas U. Berendonk, David Kneis
Summary: The study introduces a numerical model that considers fitness cost, temperature dependency, and other factors in estimating growth and plasmid transfer rate constants during bacterial conjugation experiments. Plasmid bearing costs significantly reduce growth rates between 20 and 37 degrees Celsius. The proposed model provides a better estimation of gene transmission among different bacterial and plasmid strains.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Astronomy & Astrophysics
Jun Dai, Qingmin Zhang, Ye Qiu, Chuan Li, Zhentong Li, Shuting Li, Yingna Su, Haisheng Ji
Summary: In this paper, the imaging and spectroscopic observations of a quiescent filament undergoing simultaneous horizontal and vertical large-amplitude oscillation triggered by an extreme-ultraviolet wave are presented. The oscillation involved winking phenomenon in H alpha images and horizontal motions in EUV images. The study provides evidence that Moreton waves can be excited by highly inclined eruptions.
ASTROPHYSICAL JOURNAL
(2023)
Article
Engineering, Civil
Sunil Thapa, Yadin Shrestha, Dipendra Gautam
Summary: Himalayan highways do not consider near field excitation effects in bridge design. Vertical shaking can have significant consequences in bridges, particularly at higher damage states.
Article
Chemistry, Multidisciplinary
Arsalan Nikdoost, Pouya Rezai
Summary: This paper investigates the migration and focusing behavior of microparticles in curved microchannels with viscoelastic fluids. The effects of flow velocity, fluid viscoelasticity, and particle size are studied. It is found that the introduction of fluid viscoelasticity enhances microparticle focusing, but the dominance of Dean drag force disrupts focusing at high velocities. The particle behavior is categorized using a non-dimensional analysis. The research findings can contribute to the design of future particle sorting and washing devices.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Green & Sustainable Science & Technology
Ezzeddin Bakhtavar, Shahab Hosseini, Kasun Hewage, Rehan Sadiq
Summary: This study developed an approach based on a multi-layer artificial neural network and fuzzy cognitive map to predict the vertical and horizontal distribution of blast-induced dust emissions. The performance evaluation indicated good results with high accuracy and the approach successfully reduced the distribution of dust in the surrounding areas.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Optics
Guangxing Wu, Yan Zhou, Minghui Hong
Summary: The optical microsphere nanoscope has the potential to be used in inspecting integrated circuit chips and characterizing morphology in biology. However, its resolution in ambient air is limited by the magnification and numerical aperture of the microsphere. To overcome this, high refractive index hyper-hemi-microspheres with tunable magnification were proposed and realized. Experimental results show that these hyper-hemi-microspheres have better imaging resolution and contrast compared to microspheres in air.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Construction & Building Technology
Dong Yang, Wangsuo Cai, Junchao Wang, Yong Fang
Summary: The combination of horizontal directional drilling technology and borehole TV imaging technology can be used for obtaining geological information in conventional adit exploration. This study develops an optimization algorithm for accurately extracting information on incomplete structural planes in boreholes of any azimuth. It also successfully develops a cable-free, storage-based TV device for boreholes of any azimuth.
ADVANCES IN CIVIL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Mathurin Dongmo Wamba, Jean-Paul Montagner, Barbara Romanowicz
Summary: The debate about whether the two large low-shear velocity provinces (LLSVPs) at the base of Earth's mantle are wide compact structures extending thousands of kilometers upward or bundles of distinct mantle plumes is highlighted by full waveform shear wave tomography of the deep mantle beneath the Indian Ocean. It reveals the presence of several separate broad low-velocity conduits anchored at the core-mantle boundary in the eastern part of the African LLSVP, most clearly beneath La Reunion and Comores hot spots. The deep plumbing system beneath these hot spots may resemble dyke and sills in crustal volcanic systems, but at a whole-mantle scale.
Article
Environmental Sciences
Joshua G. Varcoe, Peter Barnes
Summary: This study validates the shielding calculations for digital breast tomosynthesis (DBT) and extends the research by measuring scatter radiation in different planes. The findings indicate that the increase in scatter radiation has minimal impact on the minimum shielding requirements in most cases.
RADIATION PROTECTION DOSIMETRY
(2022)
Article
Thermodynamics
Sandip Khobragade, Jaya Krishna Devanuri
Summary: This study evaluates the thermal performance of a phase change material shell and tube heat exchanger in vertical and horizontal configurations. The results show that the temperature gradient and position have an influence on temperature, melt fraction, energy storage, and thermal transport, with a stronger effect observed in the vertical configuration.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Article
Chemistry, Multidisciplinary
Weijie Kong, Ling Liu, Changtao Wang, Mingbo Pu, Ping Gao, Kaipeng Liu, Yunfei Luo, Qijian Jin, Chengwei Zhao, Xiangang Luo
Summary: This paper presents a planar objective lens based on the optical negative refraction principle for achieving optical axis free and long depth of focus imaging nanolithography. The planar objective lens utilizes a hyperbolic metamaterial composed of silver/titanium dioxide multilayers, which generates plasmonic waveguide modes and enables optical negative refraction for flat imaging at ultraviolet wavelength. The imaging characteristics are investigated through simulation and experiment, demonstrating high resolution and cross-scale capabilities.
NANOSCALE ADVANCES
(2022)
Article
Engineering, Civil
Yoshihiro Mogi, Naohiro Nakamura, Kunihiko Nabeshima, Akira Ota
Summary: This paper investigates the performance of various sparse matrix damping models in the inelastic seismic analysis of a 35-story moment-frame steel building. The necessity of frequency-insensitive damping in large-scale analysis is illustrated through numerical simulations. The vibration characteristics with simultaneous inputs of horizontal and vertical ground motion are analyzed using different damping schemes, and their results are compared. The comparisons focus on various parameters and the computation speeds are also compared, showing the limitations and challenges of these sparse matrix damping models in practical applications.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2023)
Article
Geochemistry & Geophysics
Mianshui Rong, Xiaojun Li, Lei Fu
Summary: This study proposes an S-wave HVSR inversion method based on diffuse-field approximation to enhance the identification of underground velocity structures. By improving the objective function and introducing a slope term, the issue of multiple solutions encountered with multi-peak HVSR curves has been alleviated. Through synthetic case validation and application to real seismic observations, it has been shown that the proposed method is effective in identifying underground velocity structures.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Engineering, Multidisciplinary
Junjun Lei, Feng Cheng, Kemin Li, Zhongning Guo
APPLIED MATHEMATICAL MODELLING
(2020)
Article
Physics, Applied
Junjun Lei, Feng Cheng, Kemin Li, Zhongning Guo
APPLIED PHYSICS LETTERS
(2020)
Article
Chemistry, Multidisciplinary
Valerio Pereno, Junjun Lei, Dario Carugo, Eleanor Stride
Article
Acoustics
Guannan Yang, Wei Lin, Haiqi Lai, Jin Tong, Junjun Lei, Maodan Yuan, Yu Zhang, Chengqiang Cui
Summary: This study synthesized Cu nanoparticles under ultrasonic treatment and found that the particle size decreased exponentially with increasing ultrasonic power. A quantitative model was proposed to describe the influence of ultrasonic power on the size distribution of metal nanoparticles, revealing a relational expression that fit well with the experimental results. This research provides a new experimental basis and theoretical method for understanding the mechanism of ultrasonic-induced size refinement of metal nanoparticles.
ULTRASONICS SONOCHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
Qin Lin, Feiyan Cai, Junjun Lei, Qingying Luo, Fei Li, Jiaqian Wang, Xiangxiang Xia, Jinping Wang, Junhao Li, Hairong Zheng
Summary: Numerical demonstration of enhanced Rayleigh streaming in a resonant cylindrical shell showed similarities with classical Rayleigh streaming in a rigid cavity, but with significantly higher velocity. The enhancement of the streaming originates from resonant excitation of non-leaky circumferential modes intrinsic to the shell, making it potentially useful for applications such as particle manipulation and liquid mixing.
JOURNAL OF MICROMECHANICS AND MICROENGINEERING
(2021)
Article
Mechanics
Zhigang Huang, Luming Ge, Weixun Wei, Yu Deng, Junjun Lei
Summary: DEP-FFF is a promising method for fractionating particles with potential applications in biomedical, chemical, and environmental engineering. Particle deformation plays a critical role in the fractionation accuracy and viability of bioparticles.
Review
Chemistry, Analytical
Guotian Liu, Junjun Lei, Feng Cheng, Kemin Li, Xuanrong Ji, Zhigang Huang, Zhongning Guo
Summary: This review provides a comprehensive overview of ultrasonic particle manipulation (UPM) and its application in the field of microfluidics, with a focus on the design and operation mechanism of glass capillaries. The study also demonstrates the potential advantages and future prospects of glass capillaries in UPM.
Article
Chemistry, Analytical
Junjun Lei, Gaokun Zheng, Zhen Yao, Zhigang Huang
Summary: In this study, the authors analyze the outer acoustic streaming flows generated over a fluid-solid interface using theoretical and numerical methods. They explore the differences between symmetric and asymmetric acoustic resonances and find that in symmetric resonances, the limiting velocities always drive fluids from the acoustic pressure node towards adjacent antinodes. However, in asymmetric resonances, the outer acoustic streaming is spatially separated from the acoustic radiation force and is independent of the shift in acoustic pressure. These findings have implications for acoustics streaming flow control and particle manipulation in microfluidics applications.
Article
Physics, Applied
Junjun Lei, Feng Cheng, Gaokun Zheng, Li Lin
Summary: We report on a wave-driven microfluidic ultrasonic shaker that can stably trap and oscillate microparticles in water in a microchannel. The trapped microparticles can be perturbed and oscillated by two standing waves of different frequencies. The oscillating frequency of the trapped microparticles is determined by the frequency difference between the two sound waves, and the shaking amplitude scales inversely to the frequency difference.
PHYSICAL REVIEW APPLIED
(2022)
Article
Physics, Applied
Junjun Lei, Gaokun Zheng, Feng Cheng, Kemin Li
Summary: In this study, an acoustofluidics framework based on an equilateral triangular channel design was established to generate vertically asymmetric acoustic pressure profiles, resulting in unidirectional acoustic radiation force and drag force for rapid agglomeration and sedimentation of microparticles.
APPLIED PHYSICS LETTERS
(2023)
Article
Ecology
Fengshi Tian, Junjun Lei, Xin Zheng, Yanfu Yin
Summary: The appropriate planning of infrastructure is crucial for protecting lives and property. Fire stations play a vital role in a city's infrastructure, and their precise location is important for reducing emergency response times and minimizing casualties.
Meeting Abstract
Psychiatry
Junjun Lei
PSYCHIATRIA DANUBINA
(2022)
Article
Physics, Applied
Junjun Lei, Feng Cheng, Guotian Liu, Kemin Li, Zhongning Guo
APPLIED PHYSICS LETTERS
(2020)
Article
Veterinary Sciences
Jun Jun Lei, Yuan Yuan Hu, Fang Liu, Shu Wei Yan, Ruo Dan Liu, Shao Rong Long, Peng Jiang, Jing Cui, Zhong Quan Wang
VETERINARY RESEARCH
(2020)
