Article
Biochemical Research Methods
Ekta Prajapati, Saurav Kumar, Shishir Kumar
Summary: Muscope is a miniature lensless holographic microscope suitable for on-chip integration, utilizing a microLED display as the light source and offering computational super-resolution and wide-field imaging. It surpasses existing lensless microscopes in compactness, scalability for production, and automated operation. It presents exciting opportunities for devices with in-built optical imaging and monitoring capabilities.
Article
Optics
Ziqian He, Kun Yin, Shin-Tson Wu
Summary: The paper proposes a miniature planar telescope mediated by liquid crystal polymers that offers angle magnification independent of incident spatial location. With two cascaded liquid crystal planar optical elements, over 84.6% optical efficiency can be achieved within the incident field range. This demonstrates the potential of cascaded liquid crystal planar optical elements for realizing functionalities that cannot be fulfilled by single optical elements and enables lightweight, low loss, passive optical transmitters for widespread applications.
LIGHT-SCIENCE & APPLICATIONS
(2021)
Article
Physics, Multidisciplinary
Gilberto Saccorotti, Carlo Giunchi, Michele D'Ambrosio, Sonja Gaviano, Luca Naticchioni, Domenico D'Urso, Davide Rozza, Alessandro Cardini, Andrea Contu, Francesca Dordei, Matteo Cadeddu, Matteo Tuveri, Carlo Migoni, Michele Punturo, Annalisa Allocca, Enrico Calloni, Giovanni Luca Cardello, Luca D'Onofrio, Nazanin Davari, Daniele Dell'Aquila, Rosario De Rosa, Massimo Carpinelli, Luciano Di Fiore, Matteo di Giovanni, Luciano Errico, Irene Fiori, Maria Concetta Tringali, Jan Harms, Soumen Koley, Vittorio Longo, Ettore Majorana, Valentina Mangano, Marco Olivieri, Federico Paoletti, Luca Pesenti, Paola Puppo, Piero Rapagnani, Massimiliano Razzano, Fulvio Ricci, Valeria Sipala, Iara Tosta e Melo, Lucia Trozzo
Summary: This paper describes the operation of a temporary seismic array deployed near the dismissed mine of Sos Enattos. The spectrum characteristics around the mine are found to be related to vehicle traffic. A dispersion curve for Rayleigh waves is derived using correlation properties of seismic noise, providing an assessment of the elastic properties of rock materials at the candidate site.
EUROPEAN PHYSICAL JOURNAL PLUS
(2023)
Article
Thermodynamics
Zhicheng Pan, Ruiping Zhang, Xiaoyong Li, Ling Wang, Taihe Huang, Xiaoqing Zhang, Jianye Chen
Summary: In this paper, a new miniature Joule-Thomson (J-T) cryocooler was proposed and its steady-state cooling characteristics were analyzed via CFD numerical simulation. The performance characteristics were assessed for nitrogen under different inlet pressure and temperature, as well as different orifice widths. The results showed that the cooler had excellent cooling performance, small axial height and simple fabrication. The heat transfer increase improved the cooler stable operating temperature, and the minimum temperature could reach 138.3 K when the inlet pressure was 10 MPa. An optimal throttle orifice width delta value between 0.1 mm and 0.2 mm was found, which achieved maximum cooling capacity under minimum temperature.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Physics, Multidisciplinary
Qingling Du, Yanhui Pan, Youyang Xin
Summary: This study investigates the method and application of extracting co-directional Rayleigh surface waves from single-channel, three-component microtremor signals. The research focuses on filtering linear polarization waves using polarizability wave and phase-difference filtering, which were analyzed based on both simulated data and real microtremor signals. Additionally, the study examines the use of time-frequency analysis to analyze microtremor signals and identify Rayleigh wave propagation direction. The combination of these methods leads to a set of procedures for extracting high-SNR co-directional Rayleigh surface waves from microtremor signals, providing a reference for obtaining high signal-to-noise ratio data in microtremor Rayleigh wave seismic exploration.
FRONTIERS IN PHYSICS
(2023)
Article
Chemistry, Analytical
Junhan Wu, Wenpeng Zhang, Zheng Ouyang
Summary: A novel on-demand MS analysis method was developed based on discontinuous ion injection-induced ESI on a miniature MS system, enabling highly efficient ionization under low voltages. This method was found to be softer for ionization of proteins and allowed single-cell analysis with reduced sample consumption.
ANALYTICAL CHEMISTRY
(2021)
Article
Chemistry, Analytical
Shuonan Shan, Jingwen Li, Peiyuan Liu, Qiaolin Li, Xiaohao Wang, Xinghui Li
Summary: This paper proposes a miniature multi-channel spectrometer using a microlens array grating (MLAG) that allows simultaneous focusing and dispersion. The MLAG spectrometer is compact, lightweight, and has a high number of channels. Experimental results demonstrate low wavelength position repeatability and displacement measurement repeatability for the designed MLAG multi-channel spectrometer.
Article
Chemistry, Analytical
Xiang Lu, Xiang Xi, Kun Lu, Chengxiang Wang, Xiang Chen, Yulie Wu, Xuezhong Wu, Dingbang Xiao
Summary: A miniature deformable squama mechanics based on piezoelectric actuation has been proposed in this paper, with a small overall size but a large range of deformation angles that can be controlled to achieve diverse shapes. The array processing technology lays the foundation for the arrangement of deformed squamae, making it widely applicable in areas such as deformable skin.
Article
Chemistry, Multidisciplinary
Chelsea Shan Xian Ng, Matthew Wei Ming Tan, Changyu Xu, Zilin Yang, Pooi See Lee, Guo Zhan Lum
Summary: This paper highlights the advancements and challenges of locomotion producible by miniature soft robots in micro- to centimeter length scales, emphasizing the importance of endowing these robots with dexterous locomotive gaits. The gaits of miniature soft robots are categorized into terrestrial, aquatic, and aerial locomotion, with prospective methods and strategies discussed for improving their gait performances. This report provides critical analyses and discussions that can inspire future strategies to make miniature soft robots significantly more agile.
ADVANCED MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Jiabing Lv, Ninghao Wang, Xinle Zhu, Zhangjian Li, Zhitian Shen, Yaoyao Cui, Xiaohua Jian
Summary: In this study, a miniature higher frequency phased-array probe integrated with a 0.4 mm intervention working channel is developed for high-precision interventional guidance. Experimental results demonstrate that the proposed ultrasound transducer has high imaging resolution and detecting depth, making it suitable for high-precision interventional guidance.
IEEE SENSORS JOURNAL
(2023)
Article
Automation & Control Systems
Chibundo Nwafor, Guillaume J. Laurent, Kanty Rabenorosoa
Summary: This article presents the design and prototype of a miniature 3-DoF glass PCR capable of achieving large tip-tilt angles in a small volume. Experimental validation shows that the platform can reach tip-tilt angles from -84 degrees to 117 degrees in a space of 15 mm wide and 10 mm high, and can conveniently follow desired paths within its workspace.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Chemistry, Analytical
Qi Zhang, Xichi Lu, Ting Chen, Yu Xiao, Rujiao Yao, Jinyuan Yao
Summary: With the expanding application field, higher requirements are placed on mass spectrometers, thus necessitating the development of high-performance miniature mass spectrometers. Research shows that the optimal values for maintaining a balance between mass resolution and extraction efficiency are 1.61 mm and 200 μm. Experimental verification has demonstrated the performance of the miniature four-channel ion trap array.
Article
Multidisciplinary Sciences
Zhi-Yong Hu, Yong-Lai Zhang, Chong Pan, Jian-Yu Dou, Zhen-Ze Li, Zhen-Nan Tian, Jiang-Wei Mao, Qi-Dai Chen, Hong-Bo Sun
Summary: Researchers have demonstrated the potential of a miniature optoelectronic integrated compound eye camera by manufacturing polymer compound eyes with logarithmic profile ommatidia, which enables large field-of-view imaging, spatial position identification, and sensitive trajectory monitoring of moving targets. This insect-scale camera holds great promise for cutting-edge applications in endoscopy and robot vision by integrating well-developed planar imaging sensors with complex micro-optics elements.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Multidisciplinary
Jie Huang, Ke-Yu Pan, Xue-Lei Feng, Yong Shen
Summary: A measurement method based on nonlinear system identification was proposed to analyze and predict the nonlinear acoustic damping in miniature loudspeakers, which was validated through satisfactory agreement with theoretical calculations.
APPLIED SCIENCES-BASEL
(2021)
Article
Automation & Control Systems
Zhaolong Li, Wangwang Li, Meng Xun, Mengchen Yuan
Summary: This study firstly establishes a simulation model of the surface wetting performance of a miniature heat sink with a square columnar array microstructure based on the phase field method, and investigates the effect of dimensional parameters on its surface wetting performance. Miniature heat sinks with square columnar array microstructures of different dimensional parameters were then prepared using wire electrical discharge machining (WEDM), and their 2D micromorphology, surface wetting performance, and heat transfer performance were characterized. The experimental results show high accuracy of the simulation model and a reduction of up to 22.7% in heat source temperature with the installed miniature heat sink compared to a polished purple copper block without microstructure.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Geochemistry & Geophysics
Ikuo Cho, Takaki Iwata
EXPLORATION GEOPHYSICS
(2018)
Article
Geochemistry & Geophysics
Ikuo Cho, Atsushi Urabe, Tsutomu Nakazawa, Yoshiki Sato, Kentaro Sakata
EXPLORATION GEOPHYSICS
(2018)
Article
Geochemistry & Geophysics
Ikuo Cho, Takaki Iwata
EXPLORATION GEOPHYSICS
(2018)
Article
Geosciences, Multidisciplinary
Ikuo Cho, Yasuto Kuwahara
EARTH PLANETS AND SPACE
(2013)
Article
Geochemistry & Geophysics
Yannis Panayotopoulos, Naoshi Hirata, Hiroshi Sato, Aitaro Kato, Kazutoshi Imanishi, Yasuto Kuwahara, Ikuo Cho, Tetsuya Takeda, Youichi Asano
Article
Geochemistry & Geophysics
Ikuo Cho
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2019)
Article
Geochemistry & Geophysics
Ikuo Cho, Takaki Iwata
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2019)
Article
Geochemistry & Geophysics
Ikuo Cho
GEOPHYSICAL JOURNAL INTERNATIONAL
(2020)
Article
Geochemistry & Geophysics
Hirotoshi Uebayashi, Ikuo Cho, Michihiro Ohori, Kunikazu Yoshida, Hiroshi Arai
EXPLORATION GEOPHYSICS
(2020)
Article
Geochemistry & Geophysics
Masumi Yamada, Ikuo Cho, Chun-Hsiang Kuo, Che-Min Lin, Ken Miyakoshi, Yujia Guo, Takumi Hayashida, Yasuhiro Matsumoto, Jim Mori, Yin-Tung Yen, Keng-Chang Kuo
BULLETIN OF THE SEISMOLOGICAL SOCIETY OF AMERICA
(2020)
Article
Geochemistry & Geophysics
I Cho, T. Iwata
Summary: The study found that in microtremor surveys, incoherent noise is the key factor limiting the spatial autocorrelation method analysis. Through validation, a formula was proposed to evaluate signal-to-noise ratio and determine phase velocity, compensating for the effects of incoherent noise. Incoherent noise not only limits the analysis, but can also be used to evaluate soil attenuation.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Ikuo Cho, Shigeki Senna, Atsushi Wakai, Kaoru Jin, Hiroyuki Fujiwara
Summary: In this study, the usability of the zero-crossing method for quick microtremor surveys in earthquake engineering was demonstrated. The method showed robustness against noise and the use of the first zero crossings was found to be more suitable for inadequate wavefield conditions. The reference phase velocity dispersion curve (RPVDC), predominantly based on the first zero crossings, was effectively used for modeling S-wave profiles.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2021)
Article
Geochemistry & Geophysics
I Cho, K. Yoshida, H. Uebayashi
Summary: Theoretical models and practical data processing demonstrate the ability of rotational seismology to separate Rayleigh and Love waves in microtremors without specific array geometry or assumptions. The use of finite differencing to approximate spatial differentiation shows limitations in short and long wavelength ranges, affecting the analysis limits. A relationship between the signal-to-noise ratio and wavelength is derived.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Geosciences, Multidisciplinary
Ikuo Cho
Summary: This study demonstrates that the upper limit wavelength normalized by the array radius strongly depends on the array size in the analysis of the standard spatial autocorrelation method. It shows that even very small arrays can provide acceptable analysis results for very long wavelengths relative to the array radius, and the signal-to-noise ratio is a crucial factor determining the upper limit wavelength. The study also finds that the upper limit wavelengths and signal-to-noise ratios increase with a decrease in array radius, supporting the array size dependency.
EARTH PLANETS AND SPACE
(2022)
Article
Geochemistry & Geophysics
Michael W. Asten, Alan Yong, Sebastiano Foti, Koichi Hayashi, Antony J. Martin, William J. Stephenson, John F. Cassidy, Jacie Coleman, Robert Nigbor, Silvia Castellaro, Kosuke Chimoto, Cecile Cornou, Ikuo Cho, Takumi Hayashida, Manuel Hobiger, Chun-Hsiang Kuo, Albert Macau, E. Diego Mercerat, Sheri Molnar, Passakorn Pananont, Marco Pilz, Nakhorn Poovarodom, Esteban Saez, Marc Wathelet, Hiroaki Yamanaka, Toshiaki Yokoi, Don Zhao
Summary: This study evaluates earthquake site effects using geophysical site characterization methods and provides recommendations for preferred arrays and processing methodology for future studies.
JOURNAL OF SEISMOLOGY
(2022)