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Flexible High-Sensitivity Strain Sensor Fabricated with Pdms Micro-Channel Array Using Laser Transmission Pyrolysis Technology

Wang, S. (author), Zong, Qihang (author), Yang, Huiru (author), Huang, Qianming (author), Ye, Huaiyu (author), French, P.J. (author)

In recent years, flexible strain sensors based on metal cracks have garnered significant interest for their exceptional sensitivity. However, striking a balance between sensitivity and detection range remains a significant challenge, which often limits its wider application. Herein, we introduce an innovative laser transmission pyrolysis...

conference paper 2024

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Three-dimensional surface strain sensor based on PDMS/LIG composite film with adjustable electromechanical performance

Yang, Huiru (author), Huang, Qianming (author), Wang, S. (author), Zong, Qihang (author), Tan, C. (author), Ye, H. (author), Zhang, Kouchi (author)

Flexible strain sensors play a crucial role in health monitoring, smart wearable devices, and human–machine interaction. Three-dimensional surface evaluation methods for strain sensors offer advantages by being closer to actual strain, featuring a larger working range, and being more suitable for multidirectional strain. In this study, a...

journal article 2024

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A Low-Spur Fractional-N PLL Based on a Time-Mode Arithmetic Unit

Gao, Z. (author), He, J. (author), Fritz, Martin (author), Shen, Y. (author), Zong, Z. (author), Spalink, Gerd (author), Alavi, S.M. (author), Staszewski, R.B. (author), Babaie, M. (author)

This article introduces a low-jitter low-spur fractional-N phase-locked loop (PLL) adopting a new concept of a time-mode arithmetic unit (TAU) for phase error extraction. The TAU is a time-signal processor that calculates the weighted sum of input time offsets. It processes two inputs - the period of a digitally controlled oscillator (DCO)...

journal article 2023

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Rapid Fabrication of High-Performance Flexible Pressure Sensors Using Laser Pyrolysis Direct Writing

Wang, S. (author), Zong, Qihang (author), Yang, Huiru (author), Tan, C. (author), Huang, Qianming (author), Liu, X. (author), Zhang, Kouchi (author), French, P.J. (author), Ye, H. (author)

The fabrication of flexible pressure sensors with low cost, high scalability, and easy fabrication is an essential driving force in developing flexible electronics, especially for high-performance sensors that require precise surface microstructures. However, optimizing complex fabrication processes and expensive microfabrication methods...

journal article 2023

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High-Performance Flexible Strain Sensor Fabricated Using Laser Transmission Pyrolysis

Wang, S. (author), Yang, Huiru (author), Zong, Qihang (author), Huang, Qianming (author), Tan, C. (author), Gao, Chenshan (author), Li, Shizhen (author), Ye, H. (author), Zhang, Kouchi (author), French, P.J. (author)

In recent years, metal crack-based stretchable flexible strain sensors have attracted significant attention in wearable device applications due to their extremely high sensitivity. However, the tradeoff between sensitivity and detection range has been an intractable dilemma, severely limiting their practical applications. Herein, we propose a...

journal article 2023

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A 2.6-to-4.1GHz Fractional-N Digital PLL Based on a Time-Mode Arithmetic Unit Achieving -249.4dB FoM and -59dBc Fractional Spurs

Gao, Z. (author), He, J. (author), Fritz, Martin (author), Gong, J. (author), Shen, Y. (author), Zong, Z. (author), Chen, Peng (author), Staszewski, R.B. (author), Alavi, S.M. (author), Babaie, M. (author)

In a fractional-N PLL, it is beneficial to minimize the input range of its phase detector (PD) as it promotes better linearity and higher PD gain for suppressing noise contributions of the following loop components. This can be done by canceling the predicted instantaneous time offset between the frequency reference (FREF) and the variable...

conference paper 2022

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Experimental and numerical study on lateral and longitudinal resistance of ballasted track with nailed sleeper

Guo, Y. (author), Zong, Lu (author), Markine, V.L. (author), Wang, Xinyu (author), Jing, Guoqing (author)

Lateral and longitudinal resistance of ballasted track are two main indicators for the track stability quantification. Aiming at improving the lateral and longitudinal resistance, nailed sleeper is studied with single sleeper push tests (SSPTs) and discrete element modelling (DEM). The SSPTs were applied to study how much resistance the...

journal article 2021

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New pulsed jet using spark plasma discharge: Subsonic configuration

Benard, Nicolas (author), Zong, H. (author), Zhang, Yang (author), Kotsonis, M. (author), Acher, Gwenael (author), Cattafesta, Louis N. (author), Bonnet, Jean-Paul (author), Moreau, Eric (author)

Active flow control is demanding for new actuation technologies as none of the actual available actuators has reached all the criterions for expecting an implementation in the coming years. Here, a new type of pulsed jet is designed and preliminary measurements of its performances in quiescent flow are conducted. Pulsed operation has been chosen...

conference paper 2020

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Workload-Adaptive Configuration Tuning for Hierarchical Cloud Schedulers

Han, Rui (author), Liu, Chi Harold (author), Zong, Zan (author), Chen, Lydia Y. (author), Liu, Wending (author), Wang, Siyi (author), Zhan, Jianfeng (author)

Cluster schedulers provide flexible resource sharing mechanism for best-effort cloud jobs, which occupy a majority in modern datacenters. Properly tuning a scheduler's configurations is the key to these jobs' performance because it decides how to allocate resources among them. Today's cloud scheduling systems usually rely on cluster operators...

journal article 2019

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A 31-μ W, 148-fs Step, 9-bit Capacitor-DAC-Based Constant-Slope Digital-to-Time Converter in 28-nm CMOS

Chen, Peng (author), Zhang, Feifei (author), Zong, Z. (author), Hu, Suoping (author), Siriburanon, Teerachot (author), Staszewski, R.B. (author)

This article proposes a power-efficient highly linear capacitor-array-based digital-to-time converter (DTC) using a charge redistribution constant-slope approach. A fringe-capacitor-based digital-to-analog converter (C-DAC) array is used to regulate the starting supply voltage of the constant discharging slope fed to a fixed-threshold...

journal article 2019

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A 77/79-GHz Frequency Generator in 16-nm CMOS for FMCW Radar Applications Based on a 26-GHz Oscillator with Co-Generated Third Harmonic

Kuo, Feng Wei (author), Zong, Z. (author), Chen, Huan Neng Ron (author), Cho, Lan Chou (author), Jou, Chewn Pu (author), Chen, Mark (author), Staszewski, R.B. (author)

This paper presents a digitally controlled frequency generator for dual frequency-band radar system that is optimized for 16 nm FinFET CMOS. It is based on a 21% wide tuning range,fine-resolution DCO with only switchable metal capacitors. A third-harmonic boosting DCO simultaneously generates 22.5-28 GHz and sufficiently strong 68-84 GHz...

conference paper 2019

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High-Purity Digitally Intensive Frequency Synthesis Exploiting Millimeter-Wave Harmonics

Zong, Z. (author)

This thesis focuses on improving the phase noise and power efficiency<br/>of millimeter-wave (mm-wave) frequency synthesizers in nanometer CMOS.<br/>The mm-wave frequency spectrum is widely adopted in various upcoming<br/>volume commercial wireless applications. These new applications provide<br/>more interconnection between the physical and...

doctoral thesis 2019

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Synthesis, characterization, and CO₂ uptake of mellitic triimide-based covalent organic frameworks

Veldhuizen, H.V. (author), Vasileiadis, A. (author), Wagemaker, M. (author), Mahon, T.R. (author), Mainali, D.P. (author), Zong, Lishuai (author), van der Zwaag, S. (author), Nagai, A. (author)

journal article 2019

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A Supply Pushing Reduction Technique for LC Oscillators Based on Ripple Replication and Cancellation

Chen, Y. (author), Liu, Yao-Hong (author), Zong, Z. (author), Dijkhuis, Johan (author), Dolmans, Guido (author), Staszewski, R.B. (author), Babaie, M. (author)

In this paper, we propose a method to suppress supply pushing of an LC oscillator such that it may directly operate from a switched-mode dc-dc converter generating fairly large ripples. A ripple replication block (RRB) generates an amplified ripple replica at the gate terminal of the tail current source to stabilize the oscillator's tail...

journal article 2019

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A Low-Noise Fractional-N Digital Frequency Synthesizer With Implicit Frequency Tripling for mm-Wave Applications

Zong, Z. (author), Chen, Peng (author), Staszewski, R.B. (author)

In this paper, we propose a 60-GHz fractional-N digital frequency synthesizer aimed at reducing its phase noise (PN) at both the flicker (1/f ³ ) and thermal (1/f ² ) regions while minimizing its power consumption. The digitally controlled oscillator (DCO) fundamentally resonates at 20 GHz and co-generates a strong...

journal article 2019

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Plasma synthetic jet actuators for active flow control

Zong, H. (author), Chiatto, Matteo (author), Kotsonis, M. (author), de Luca, Luigi (author)

The plasma synthetic jet actuator (PSJA), also named as sparkjet actuator, is a special type of zero-net mass flux actuator, driven thermodynamically by pulsed arc/spark discharge. Compared to widely investigated mechanical synthetic jet actuators driven by vibrating diaphragms or oscillating pistons, PSJAs exhibit the unique capability of...

review 2018

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Plasma synthetic jet actuators for active flow control

Zong, H. (author)

In the last few decades, active flow control (AFC) technology has been developed to minimize the aerodynamic drag of transportation vehicles and maximize the propulsion efficiency of thermodynamic engines. The key of this technology is the actuators. Among all the actuators that have been proposed (i.e. fluidic, moving object, or plasma-based),...

doctoral thesis 2018

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Airfoil flow separation control with plasma synthetic jets at moderate Reynolds number

Zong, H. (author), van Pelt, T. (author), Kotsonis, M. (author)

Abstract: An array of 26 plasma synthetic jet actuators (PSJA) is flush-mounted on a NACA-0015 airfoil model to control the leading-edge flow separation at moderate Reynolds number (Re_c= 1.7 × 10 ⁵). The stall angle of this airfoil is postponed from 15. 5 ^∘ to approximately 22 ^∘, and the peak lift...

journal article 2018

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Influence of nondimensional heating volume on efficiency of plasma synthetic jet actuators

Zong, H. (author)

The influence of geometrical parameters on the electromechanical efficiency of the plasma synthetic jet actuator is investigated with electrical measurements and phase-locked planar particle imaging velocimetry measurements. Two actuators with changeable electrode distance are tested. The first actuator features a fixed cavity volume of 942 mm3;...

journal article 2018

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Experimental Investigation on Frequency Characteristics of Plasma Synthetic Jets

Zong, H. (author), Kotsonis, M. (author)

The performance of a two–electrode plasma synthetic jet actuator (PSJA) is investigated for a wide range of dimensionless actuation frequencies (f*) using high-speed phase-locked Particle Imaging Velocimetry (PIV) measurements. The jet-induced velocity fields in the axisymmetric plane are measured during both...

journal article 2017