Article
Mechanics
Qingchi Zhu, Lei Zhou, Jiahao Wen, Tingting Liu, Jize Zhang, Hui Tang, Hongfu Zhang
Summary: This study investigates the flutter response of a rectangular cylinder model with an aspect ratio of 5 at the Reynolds number Re = 100 via direct numerical simulation. The effects of two key parameters, i.e., the moment of inertia and reduced flow velocity, on the aerodynamic performance and dynamic responses of the cylinder in the state of torsional flutter are investigated. The results show that both an increase in the moment of inertia and a higher reduced flow velocity lead to a larger torsional amplitude and a corresponding decrease in torque.
Article
Physics, Multidisciplinary
Sunita Kumawat, Sumit Kumar Vishwakarma
Summary: This study investigates the transference of torsional surface waves in an infinite triclinic cylinder, deriving the dispersion equation and discussing various crystal structures. 2D and 3D graphs are used to illustrate the relationship between phase velocity and wave number, providing insight into constructing torsional wave sensors for predicting earthquake damage using artificial explosions.
Article
Mechanics
Xianrong Liang, Wulei Cai, Honghui Chen, Yunfeng Zhao, Heng Wu, Mengmeng Wang, Gang Jin
Summary: The method proposed in the research generates oscillatory extensional flow using an eccentric cylinder flow, with the frequency and amplitude controlled by the angular velocity and eccentricity of the cylinders. This flow field shows promise as a rheological tool for investigating the effects of extensional flows on dispersion dynamics.
Article
Physics, Applied
C. Patramanis-Thalassinakis, P. S. Karavelas, I. K. Kominis
Summary: A falling-sphere viscometer with a magnetized sphere and fluxgate magnetometers is presented, which continuously measures the magnetic field produced by the falling sphere at sensor positions. It directly measures dynamic viscosities in a range between 200 and 3000 cP with a precision of 3% within a fluid volume of 15 ml and within a few seconds.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Mechanics
Arnab Kumar De, Sandip Sarkar
Summary: In this study, two-dimensional computations were conducted to investigate the vortex-induced vibration of an elastically mounted circular cylinder colliding with a rigid wall. The results identified chaotic, periodic, and quasi-periodic vortex shedding modes under different conditions, which are influenced by the deflected gap flow induced by the wall shear layer during the cylinder's motion.
Article
Gastroenterology & Hepatology
Masashi Hirooka, Yohei Koizumi, Yoshiko Nakamura, Ryo Yano, Yuki Okazaki, Koutarou Sunago, Yusuke Imai, Takao Watanabe, Osamu Yoshida, Yoshio Tokumoto, Masanori Abe, Yoichi Hiasa
Summary: This study investigated the correlation between splenic stiffness measured using 2D shear wave elastography and hepatic venous pressure gradient (HVPG) in patients with chronic liver disease. The results showed that splenic shear wave speed (SWS) was closely correlated with HVPG and could serve as a predictive marker for high-risk varices.
HEPATOLOGY RESEARCH
(2023)
Article
Thermodynamics
Abdelatif Salmi, Hadi Ali Madkhali, Uzma Arif, Sayer Obaid Alharbi, M. Y. Malik
Summary: This article models the diffusion process of heat and mass transfer in synovial fluid, and explores the lubricant nature of the fluid and the effects of parameters on friction by considering viscosity, Brownian motion, and thermophoresis.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Physics, Fluids & Plasmas
Veronika Dyakova, Denis Polezhaev
Summary: In this study, the stability of the interface between a low-viscosity fluid and a granular medium was experimentally investigated. Regular ripples were observed at the interface under specific conditions. The presence and disappearance of the ripples were controlled by adjusting the ratio of rotation rate and gravity. The mechanism of ripple formation was also discussed.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Multidisciplinary Sciences
Hang Zhou, Yongli Ma
Summary: Recent experiments on sound waves in a unitary Fermi gas have revealed various transport properties of strongly interacting fermions. The study focused on the temperature regimes near and below the superfluid critical temperature Tc in the BCS-BEC crossover, presenting a Kubo-based microscopic calculation of thermal conductivity κ. The study found that the contributions of fermionic quasiparticles to thermal transport change with temperature, with κ dropping upon crossing the pseudogap temperature T and exhibiting different temperature dependence below Tc.
SCIENTIFIC REPORTS
(2021)
Article
Mathematics, Applied
Lijun Hu, Sebert Feng
Summary: This paper addresses the shock instability of a convection-pressure flux splitting scheme and proposes a new shock stable flux splitting scheme by introducing additional viscosities of entropy wave and shear wave to damp out all perturbations in the transverse direction. Numerical results demonstrate that the new scheme greatly improves robustness without compromising accuracy.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Acoustics
Yuma Iiboshi, Akito Iwata, Takahiro Hayashi, Naoki Mori
Summary: This paper describes the energy trapping of circumferential shear horizontal wave (C-SH wave) at a circumferential inner groove of a hollow cylinder. The resonant frequencies of the C-SH wave are derived using both exact and approximated solutions. Energy trapping conditions are examined using dispersion curves, and it is shown that energy is trapped at the inner surface groove of the hollow cylinder. Eigen frequency analysis and experiments confirm the energy trapping at the inner groove, and the possibility of using the energy trap mode as a QCM-like sensor is demonstrated by studying the change in resonance frequency for different concentrations of a glycerin solution.
Article
Medicine, General & Internal
Delia Doris Muntean, Manuela Lavinia Lenghel, Diana-Raluca Petea-Balea, Anca Ileana Ciurea, Carolina Solomon, Sorin Marian Dudea
Summary: This study aimed to functionally assess the parotid glands (PG) and submandibular glands (SMG) in healthy subjects using the novel Viscosity PLUS (Vi.PLUS) and 2D Shear-Wave Elastography PLUS (2D-SWE.PLUS) techniques. The results showed that the viscosity and elasticity of the parotid glands significantly increased after stimulation, while the submandibular glands did not show significant changes. Vi.PLUS measurements demonstrated a good positive correlation with 2D-SWE.PLUS values.
Article
Nanoscience & Nanotechnology
S. Sujith, Anand Kumar Solanki, Rahul S. Mulik
Summary: The rheological behavior and density of MoS2/sesame oil based nano-lubricants were experimentally investigated in this study. The viscosity and density of the nano-lubricants were found to increase with an increase of solid volume fraction and decrease with an increase in temperature. The study also discussed the effect of nanoparticle concentration on the pumping power of lubricant flow.
Article
Medicine, General & Internal
Diana-Raluca Petea-Balea, Carolina Solomon, Delia Doris Muntean, Ioana-Teofana Dulgheriu, Cristina Alina Silaghi, Sorin Marian Dudea
Summary: This study used a new ultrasound technique, Vi PLUS, to measure the viscosity of the thyroid gland and evaluate its biomechanical properties. The results showed a positive correlation between thyroid viscosity and elasticity, while no significant correlations were found with age, gender, and body mass index. Vi PLUS represents a promising tool for assessing the thyroid gland.
Article
Acoustics
Quentin Baudis, Tony Valier-Brasier, Regis Wunenburger
Summary: In this study, we present a detailed procedure for measuring the rheological properties of soft, highly attenuating, visco-elastic materials at ultrasonic frequencies. We use a crosslinked Polyurethane (PU) elastomer as an example and determine its complex longitudinal modulus M and shear modulus G as a function of frequency and temperature. The results show that M, G, and bulk modulus K obey the time-temperature superposition principle and can be accurately described using a fractional derivative rheological model.
Review
Engineering, Multidisciplinary
Thomas Voglhuber-Brunnmaier, Bernhard Jakoby
Summary: This review focuses on the basic similarities between various electromechanical transducers and their evaluation methods, showing that a common design route can be followed despite apparent differences. It outlines that single vibration modes can be approximated by damped harmonic oscillators accounting for hydrodynamic loading. The two common classes of sensors, piezoelectric and electrodynamic, can be described by dual circuits and share the same resonance estimation method. The limitations associated with this unified approach are also discussed, along with aspects regarding interface circuits and accuracy-limiting factors such as noise and interference.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Instruments & Instrumentation
Thomas Voglhuber-Brunnmaier, Alexander O. Niedermayer, Bernhard Jakoby
Summary: This work presents two main topics for more efficient use of oil condition monitoring systems based on resonant fluid sensing. Firstly, a new fluid model for a compact measurement unit is discussed, which allows simultaneous measurement of viscosity and density. It is shown that this new fluid model achieves higher accuracies compared to earlier models. Secondly, the work explores the measurement of fluid parameters over varying temperatures, providing additional monitoring parameters and enhanced data consistency. An alternative representation of the Vogel model is proposed, using transformed parameters with clear physical meaning and improved stability in the presence of measurement noise.
TM-TECHNISCHES MESSEN
(2022)
Editorial Material
Engineering, Multidisciplinary
Hongki Yoo, Marco da Silva, Bernhard Jakoby, Andrew Yacoot, Yoshiro Yamada, Kenneth Christensen
MEASUREMENT SCIENCE AND TECHNOLOGY
(2022)
Article
Chemistry, Analytical
Gerald Puhringer, Cristina Consani, Reyhaneh Jannesari, Clement Fleury, Florian Dubois, Jasmin Spettel, Thang Duy Dao, Gerald Stocker, Thomas Grille, Bernhard Jakoby
Summary: This paper presents and analyzes a design of an absorber-waveguide system that combines a highly sensitive waveguide array concept with a resonant selective absorber. The system shows potential applications in optical on-chip integrated devices.
Article
Engineering, Electrical & Electronic
Bernhard Jakoby, Roman Beigelbeck, Thomas Voglhuber-Brunnmaier
Summary: The static shielding properties of Faraday wire cages do not conform to the simple approximation of an exponentially decaying field. In this study, a circular 2D wire cage is used to visualize the residual field inside the cage. The approximation of the induced charge as a sampled version of the induced charge of a corresponding ideal Faraday cage yields useful approximations for the residual fields close to the cage boundary.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Optics
Pooja Thakkar, Clement Fleury, Gerald Stocker, Florian Dubois, Thang Duy Dao, Reyhaneh Jannesari, Parviz Saeidi, Gerald Puehringer, Thomas Ostermann, Thomas Grille, Bernhard Jakoby, Andreas Tortschanoff, Cristina Consani
Summary: Non-dispersive infrared (NDIR) absorption spectroscopy is a widely used method for gas sensing due to its selectivity and conceptual simplicity. The design and fabrication of microstructures, specifically waveguides, that can combine high sensitivity with ease of integrability of other sensor elements is a major challenge for fully integrated NDIR sensors. In this study, we investigate a class of coupled strip-array (CSA) waveguides on a SiO2/Si3N4 platform, fabricated using mass semiconductor processes, and demonstrate their comparable sensitivity for various geometries, making it a promising platform for meeting multiple sensor and fabrication requirements without sacrificing performance.
Editorial Material
Engineering, Multidisciplinary
Bernhard Jakoby, Yoshiro Yamada, Kenneth Christensen, Jacek Paziewski
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Reyhaneh Jannesari, Thomas Grille, Gerald Stocker, Bernhard Jakoby
Summary: This paper investigates the use of a miniaturized filter based on a triangular lattice of holes in a photonic crystal (PhC) slab. The plane wave expansion method (PWE) and finite-difference time-domain (FDTD) techniques were utilized to analyze the dispersion and transmission spectrum, as well as the quality factor and free spectral range (FSR) of the filter. A 3D simulation has demonstrated that for the designed filter, an FSR of more than 550 nm and a quality factor of 873 can be attained by adiabatically coupling light from a slab waveguide into a PhC waveguide.
Article
Engineering, Electrical & Electronic
Andreas Troels, Herbert Enser, Stefan Clara, Wolfgang Hilber, Bernhard Jakoby
Summary: This study proposes a method for designing heater electrodes on substrates with high thermal conductivity. By covering the substrate with a polymer insulation layer and electrically conductive heater electrodes, the temperature inside a predetermined optimization area can be as uniform or non-uniform as desired. The method has potential applications in high-precision heating and droplet operations.
IEEE SENSORS JOURNAL
(2023)
Article
Chemistry, Physical
Alina Arslanova, Ine Matthe, Olivier Deschaume, Carmen Bartic, Wouter Monnens, Erwin Konrad Reichel, Naveen Reddy, Jan Fransaer, Christian Clasen
Summary: The motion of self-propelling microswimmers is affected by liquid-liquid interfaces (LLI), which can enhance or reduce their mobility and also steer the direction of their propulsion. In this study, the adsorption and motion of bimetallic Janus sideways propelled rods were studied at the interface between an aqueous solution of hydrogen peroxide and oil. It was found that the wetting properties of the rods result in a wide distribution of their velocities at the LLI, with a significant enhancement of motility compared to near a solid wall.
Article
Computer Science, Information Systems
Rafael Ecker, Tina Mitteramskogler, Manuel Langwiesner, Andreas Fuchsluger, Marcus A. A. Hintermueller, Bernhard Jakoby
Summary: A modular microfluidic system with convenient and reliable connection technology based on magnets and casted O-ring-like structures has been designed and experimentally evaluated. Various integration technologies and functional components have been realized, including directional valves, reciprocating pumps, finger pumps, directly-cast check- and Tesla-valves, fluidic flow sensors, fluidic mixers, commercial valves, and various sensors. The feasibility of these devices has been demonstrated using different measurement setups.
Article
Chemistry, Physical
Nick Pellens, Nikolaus Doppelhammer, Karel Asselman, Barbara Thijs, Bernhard Jakoby, Erwin K. Reichel, Francis Taulelle, Johan Martens, Eric Breynaert, C. E. A. Kirschhock
Summary: This study investigated zeolite crystallization from single phasic hydrated silicate ionic liquids (HSiL) using a specifically designed conductivity measurement set-up, providing access to the crystallization kinetics. A crystallization model based on a surface growth mechanism was proposed, showing that zeolite crystallization from highly ionic media proceeds via a multi-step mechanism involving reversible surface condensation and incorporation of growth units into the crystal. The agreement between experiment and theory suggests that the crystallization process is governed by liquid phase concentration, surface energy, and cation mobility.
FARADAY DISCUSSIONS
(2022)
Article
Computer Science, Information Systems
Gerold Fink, Tina Mitteramskogler, Marcus A. Hintermueller, Bernhard Jakoby, Robert Wille
Summary: This study proposes a method for the automatic design of tree-shaped concentration gradient generators and introduces an online tool. The tool generates suitable designs by adjusting the hydrodynamic resistances within the network based on user-defined requirements. The method is flexible and user-friendly, and it can accommodate different mixing ratios, flow rates, and channel widths.
Article
Engineering, Electrical & Electronic
Kehao Feng, Zhenghua Zhang, Guohua Bai, Xiuyuan Fan, Rongzhi Zhao, Xuefeng Zhang
Summary: This paper proposes a new method to accurately evaluate the high-frequency power loss of soft magnetic materials. Through a two-step calibration, the system is able to compensate for the phase angle discrepancy between the exciting current and induced voltage, enabling a higher power loss measurement frequency.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Mingfang Kang, Tong Liu, Hongmei Sun, Lin Li, Keliang Wang
Summary: In this study, the absorption performance of ambient nitrogenous toxic gases on a monolayer of blue phosphorus phase germanium selenide (GeSe) was investigated using density-functional theory calculations. The results showed that GeSe monolayer exhibits higher sensitivity and selectivity for the hazardous gas NO.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Yaqiong Niu, Zhicheng Zou, Longsheng Cheng, Chaofeng Ye
Summary: This paper proposes a novel method to stabilize the laser diode output using a close-loop control with two feedbacks. The proposed method performs better for long-time operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jiajie Li, Ying Liu, Zhen Chai, Qian Cao, Renjie Li, Yueyang Zhai
Summary: This study proposed an efficient and high-quality beam-splitting method based on a diffractive optical element, enabling multichannel SERF atomic magnetometers to achieve ultra-high consistency and sensitivity. It has significant applications in array biomagnetic measurement systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
E. Oliveira, C. Doering, H. Fouckhardt
Summary: With the development of Lab on a chip technology, fluid management using dispersed droplets has become an important approach. Electrowetting on dielectric (EWOD) is one method for droplet actuation, but it requires prior definition of droplet positions. Optoelectrowetting (OEW) goes further by allowing changes in electrical parameters through impinging light spots, without the need for predefined droplet positions. This study re-evaluates the key parameters of OEW and explores their effects on droplet actuation using numerical optimization methods.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Haipeng Wang, Zhiguo Wang, Gancheng Zhu, Shuai Zhang
Summary: A novel capacitive proximity skin was developed to improve the performance of robotics in handling liquid-filled containers. This skin features a flexible structure that can adapt to different grippers and seamlessly integrate with Robot Operating System. Experimental results demonstrated that this proximity skin achieved data-lossless detection and contactless measurement of liquid level, making it suitable for grasping operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Tsenguun Byambadorj, Xiangyu Zhao, Yutao Qin, Yogesh B. Gianchandani
Summary: In this research, a monolithically microfabricated Knudsen pump (KP) without suspended membranes was presented. These pumps offer improved mechanical robustness, wider process window, and simplified microfabrication process compared to previous designs. The experimental results matched the modeling results well, indicating the potential for monolithic integration onto complex lab-on-a-chip systems.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Hamed Karami, Saeed Karami Chemeh, Vahid Azizi, Hooman Sharifnasab, Jose Ramos, Mohammed Kamruzzaman
Summary: Aroma is a significant quality trait for pharmaceutical plants and their products, indicating the quality of the raw material. An electronic nose is an efficient approach for identifying and evaluating the aroma of essential oils. In this study, tarragon was dried at different temperatures and air velocities, and the purity of tarragon essential oil was evaluated using an electronic nose. Multivariate data analysis and artificial neural networks modeling were employed to quantify and classify the obtained essential oils.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Xiaoyang Duan, Dan Xu, Wenjun Jia, Ran Li, Bohao Sun, Ruitian Yan, Wenjie Zhao
Summary: Flower-like WO3/WS2 heterojunction materials constructed via a low-temperature in-situ oxidation method exhibit significant improvements in the detection of NO2 gas in gas sensors, along with good selectivity and reproducibility.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Peng Yu, Mengyang Zhang, Manqi You, Yuxi Gao, Landong Xiao, Yan Peng, Jingxia Lai, Zhouzhao Shi, Siwei Luo, Gencai Guo, Gang Guo
Summary: Recent studies have shown that two-dimensional Janus transition metal dichalcogenides (TMDs) have great potential for applications in gas sensors. By conducting first principles calculations, this study explores the potential application of Pd-doped monolayer HfSeS as gas sensor materials for detecting CO, CO2, NH3, and NO. The results demonstrate the good thermodynamical stability and reversible adsorption of these molecules on both pristine and Pd-doped HfSeS, with Pd-doped HfSeS showing higher sensitivity towards NO due to its metallic behavior upon NO adsorption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jinlan Yang, Linjiao Li, Jun Huang, Quan Zhang, Hiba Affane
Summary: This study proposes a method for large-scale aggregation of micro-particles by creating a vortex region using low-frequency oscillation. Experimental results show that this method can achieve a large aggregation area and has the advantages of low cost and low power consumption.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Jitendra Singh, Saurabh Kumar Gupta, Vinita
Summary: In this investigation, a Surface Acoustic Wave (SAW) formalin gas sensor was explored for low-level formalin gas sensing applications. The sensor showed stable response and high sensitivity to formalin gas concentration, making it a reliable and useful sensor for room temperature operations.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Junyao Wang, Yahao Liu, Huan Liu, Qi Hou, Jianxin Xu, Hongxu Pan, Jingran Quan, Yansong Chen, Hanbo Yang, Lixiang Li
Summary: A flexible electrode with a serpentine-shaped tetra-chiral structure was designed to improve the mechanical properties and prevent mechanical fracture of flexible electrodes. The research demonstrated that this structure reduced the maximum tensile stress by 87.19% compared to the existing tetra-chiral structure. The flexible electrode remained conductive even at a strain of 70% and showed resistance values of 5 ohm and 4.4 ohm at a bending angle of 180 degrees and after 1000 fold cycles. Furthermore, the flexible electrodes showed great potential in biological signal monitoring, particularly in collecting ECG and pulse signals.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
Taihao Chen, Yong Fang, Mengru Zhu, Zhiwei Zhao, Wei Lei, Zhuoya Zhu, Helong Jiang
Summary: Flexible dual-spectral carbon nanodots/flexible n-silicon heterojunction photodetectors with high responsivity and detectivity are reported. These detectors show photo response in UV illumination and only in forward bias under visible illumination. The photocurrent of the device remains high even under bending strain.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
Article
Engineering, Electrical & Electronic
M. S. Sikandar Bathusha, Israr Ud Din, Rehan Umer, Kamran A. Khan
Summary: Graphene-based nanomaterials are used as embedded sensors to monitor fracture behavior in composite structures. This study investigates the in-situ crack propagation and fracture behavior in a glass fiber reinforced polymer composite using embedded reduced graphene oxide coated fabrics and highly conductive graphene nanoplatelet paper.
SENSORS AND ACTUATORS A-PHYSICAL
(2024)
