journal
https://read.qxmd.com/read/38535487/an-annular-pulse-forming-line-based-on-coaxial-transmission-lines
#1
JOURNAL ARTICLE
Xudong Qiu, Jiancang Su, Rui Li, Jie Cheng, Bo Zeng, Binxiong Yu, Yongdong Li
The miniaturization, lightweight, and solidification of pulse forming lines (PFLs) are of prime significance during the evolution of pulsed power technology. In this paper, an all-solid-state annular pulse forming line (APFL) based on film-insulated coaxial transmission lines is developed to generate fast-rise time quasi-square pulses. First, a coiled coaxial transmission line (CCTL) comprised of multilayer polypropylene films with outstanding insulating properties is constructed. It can withstand direct current voltages up to 200 kV, with a cross section diameter of 7...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38535486/design-fabrication-and-characterization-of-a-high-sensitivity-integrated-quartz-vibrating-beam-accelerometer
#2
JOURNAL ARTICLE
Cun Li, Hong Xue, Yulong Zhao
This paper describes the design, fabrication, and characterization of a quartz vibrating beam accelerometer consisting of a metal spring-mass and quartz double-ended tuning forks (DETFs). In this approach, the inertial force of the proof mass pulls or compresses the DETFs, affecting their resonance frequency and, thus, enabling the quasi-digital measurement of acceleration. An isolation structure was specifically designed to prevent the external interference stress from transforming into the DETFs and to decrease the DETFs' thermal stress as the ambient temperature changes...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38535485/experimental-verification-and-rapid-estimation-of-uncalibrated-cable-force-via-video-based-and-vibration-based-measurements
#3
JOURNAL ARTICLE
Yanhao Li, Ufuoma Joseph Udi, Mustafasanie M Yussof, Xing Tan
The stayed-cable is an important component of cable-stayed bridges, with cable force being a focal point during construction and bridge operation. The advancement of camera and image processing technology has facilitated the integration of computer vision technology in structural inspection and monitoring. This paper focuses on enhancing cable force measurement methods and addressing the limitations of traditional testing techniques by conducting experimental research on cable force estimation using video recording...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38535484/atom-resolved-imaging-with-a-silicon-tip-integrated-into-an-on-chip-scanning-tunneling-microscope
#4
JOURNAL ARTICLE
Afshin Alipour, Emma L Fowler, S O Reza Moheimani, James H G Owen, John N Randall
Limited throughput is a shortcoming of the Scanning Tunneling Microscope (STM), particularly when used for atomically precise lithography. To address this issue, we have developed an on-chip STM based on Microelectromechanical-Systems (MEMS) technology. The device reported here has one degree of freedom, replacing the Z axis in a conventional STM. The small footprint of the on-chip STM provides a great opportunity to increase STM throughput by incorporating a number of on-chip STMs in an array to realize parallel STM...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38535483/a-hybrid-simulator-with-novel-bicone-wire-grid-antenna
#5
JOURNAL ARTICLE
Shiji Li, Junna Li, Fangzheng Wu, Qixiang Huang, Yuhan Gong, Tian Yang, Jian Liu, Xiaoyu Zhou, Aici Qiu
The simulator is an indispensable device for the study of high-altitude electromagnetic pulse (HEMP) effects. In order to improve the quality of the electric field waveforms of the HEMP simulator, we carried out simulation and experimental studies for the biconical-wire grid antenna. A new bicone-wire grid antenna HEMP simulator was designed by using skeletonized cones instead of solid cones, which can substantially improve the mobility of the simulator. The effects of different aspect ratios and different cone structures of the simulator on the waveform and distribution characteristics of the electric field were analyzed...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38535482/high-precision-characterization-of-quantum-cascade-laser-frequency-response-using-wavelength-modulation-spectroscopy
#6
JOURNAL ARTICLE
M H Hlaing, Caio Azevedo, M Amir Khan
This paper investigates the impact of the quantum cascade laser's frequency modulation response on its tuning rate and tunability. We show a significant disparity in laser tuning rates and tunability between single and dual-frequency modulation schemes frequently used in typical direct absorption and wavelength modulation spectroscopy (WMS) techniques. We show that the DC-characterized tuning rate of a laser can be reduced significantly under a specific set of modulation frequencies of the laser injection current...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38530274/a-study-on-dynamic-pressure-sensor-based-on-pitot-tube-structure
#7
JOURNAL ARTICLE
Hao Yu, Xiaofeng Wang, Yan Liu, Fan Bai
To meet the demand for the accurate measurements of the dynamic pressure of a shock wave, a composite dynamic pressure sensor design method is proposed based on the formation mechanism, propagation characteristics, special testing environment of the dynamic pressure, and Pitot tube structure. The dynamic pressure of the shock wave is evaluated by the total pressure and static pressure units installed in the composite sensor. FLUENT simulation software was used to analyze the aerodynamic characteristics of the dynamic pressure sensor, and parameters such as the structural size and inlet position of the sensor were determined...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38530273/ultra-low-noise-front-end-design-for-smart-optical-sensors-with-high-sensitivity-and-wide-dynamic-range
#8
JOURNAL ARTICLE
Hongshen Wan, Yunfei Meng, Zehua Wang, Zhenhui Du
Ultra-low noise is a critical component in the design of high-precision sensor front-ends. We introduced differential phase-sensitive detection (d-PSD) to mitigate both multiplicative and additive noise in optical sensors, aiming for an enhanced performance and cost-effectiveness. The d-PSD combines a capacitive transimpedance amplifier (C-TIA), a delta-sigma analog-to-digital converter (ΔΣ-ADC), and a software-based lock-in amplifier (s-LIA). The first two components utilize the DDC112 (a dual current input 20-bit ADC) for a minimal analog channel length, thus reducing noise efficiently, while the latter employs a cost-effective 32-bit microcontroller unit (MCU), the HC32F460...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38526442/publisher-s-note-point-projection-radiography-of-electromagnetically-accelerated-flyer-plates-with-an-external-x-pinch-driver-rev-sci-instrum-95-023508-2024
#9
J Read, G Burdiak, S N Bland, L S Caballero Bendixsen, L Paxton-Fear, N Niasse, C Dobranszki, N Hawker
No abstract text is available yet for this article.
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38526441/design-and-analysis-of-a-microgripper-for-trans-scale-clamping-based-on-a-compliant-multistable-mechanism
#10
JOURNAL ARTICLE
Luqing Hu, Hongxi Wang, Guanwei Wang, Wenhong Liang
Piezoelectric actuators commonly used in microgrippers have a small stroke, and their accuracy is reduced by the transmission amplification unit, which leads to a contradiction between the clamping range and the clamping accuracy in existing piezoelectric-actuated microgrippers. This paper proposes a design scheme to divide the total clamping range of the microgripper into segments based on the compliant multistable mechanism (CMM). First, by using the stable equilibrium positions of the CMM, the total clamping range of the microgripper is divided into multiple smaller clamping sub-intervals to accommodate objects of different scales...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38526440/a-multi-scale-attention-residual-based-u-net-network-for-stroke-electrical-impedance-tomography
#11
JOURNAL ARTICLE
Jinzhen Liu, Liming Chen, Hui Xiong, Liying Zhang
Electrical impedance tomography (EIT), a non-invasive, radiation-free, and convenient imaging technique, has been widely used in the diagnosis of stroke. However, due to soft-field nonlinearity and the ill-posed inverse problem, EIT images always suffer from low spatial resolution. Therefore, a multi-scale convolutional attention residual-based U-Net (MARU-Net) network is proposed for stroke reconstruction. Based on the U-Net network, a residual module and a multi-scale convolutional attention module are added to the concatenation layer...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38526439/publisher-s-note-laser-temperature-programmed-desorption-a-flexible-technique-to-study-ion-surface-interaction-rev-sci-instrum-95-033004-2024
#12
JOURNAL ARTICLE
M Minissale, A Dunand, P Hiret, J-B Faure, C Grisolia, T Angot, L Gallais, R Bisson
No abstract text is available yet for this article.
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38517259/high-resolution-mhz-time-and-angle-resolved-photoemission-spectroscopy-based-on-a-tunable-vacuum-ultraviolet-source
#13
JOURNAL ARTICLE
Lukas Hellbrück, Michele Puppin, Fei Guo, Daniel D Hickstein, Siham Benhabib, Marco Grioni, J Hugo Dil, Thomas LaGrange, Henrik M Rønnow, Fabrizio Carbone
The time- and angle-resolved photoemission spectroscopy (trARPES) allows for direct mapping of the electronic band structure and its dynamic response on femtosecond timescales. Here, we present a new ARPES system, powered by a new fiber-based femtosecond light source in the vacuum ultraviolet range, accessing the complete first Brillouin zone for most materials. We present trARPES data on Au(111), polycrystalline Au, Bi2Se3, and TaTe2, demonstrating an energy resolution of 21 meV with a time resolution of <360 fs, at a high repetition rate of 1 MHz...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38517258/a-versatile-laser-based-apparatus-for-time-resolved-arpes-with-micro-scale-spatial-resolution
#14
JOURNAL ARTICLE
S K Y Dufresne, S Zhdanovich, M Michiardi, B G Guislain, M Zonno, V Mazzotti, L O'Brien, S Kung, G Levy, A K Mills, F Boschini, D J Jones, A Damascelli
We present the development of a versatile apparatus for 6.2 eV laser-based time and angle-resolved photoemission spectroscopy with micrometer spatial resolution (time-resolved μ-ARPES). With a combination of tunable spatial resolution down to ∼11 μm, high energy resolution (∼11 meV), near-transform-limited temporal resolution (∼280 fs), and tunable 1.55 eV pump fluence up to 3 mJ/cm2, this time-resolved μ-ARPES system enables the measurement of ultrafast electron dynamics in exfoliated and inhomogeneous materials...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38517257/method-of-kinetic-energy-reconstruction-from-time-of-flight-mass-spectra
#15
JOURNAL ARTICLE
A Ngai, K Dulitz, S Hartweg, J C Franz, M Mudrich, F Stienkemeier
We present a method for the reconstruction of ion kinetic energy distributions from ion time-of-flight mass spectra through ion trajectory simulations. In particular, this method is applicable to complicated spectrometer geometries with largely anisotropic ion collection efficiencies. A calibration procedure using a single ion mass peak allows the accurate determination of parameters related to the spectrometer calibration, experimental alignment, and instrument response function, which improves the agreement between simulations and experiment...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38517256/femtosecond-fluorescence-conical-optical-parametric-amplification-spectroscopy
#16
JOURNAL ARTICLE
Ennan Cui, Heyuan Liu, Zhuan Wang, Hailong Chen, Yu-Xiang Weng
Parametric superfluorescence (PSF), which originated from the optical amplification of vacuum quantum noise, is the primary noise source of femtosecond fluorescence non-collinear optical parametric amplification spectroscopy (FNOPAS). It severely affects the detection limit of FNOPAS to collect the femtosecond time-resolved spectra of extremely weak fluorescence. Here, we report the development of femtosecond fluorescence conical optical parametric amplification spectroscopy (FCOPAS), aimed at effectively suppressing the noise fluctuation from the PSF background...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38511996/automatic-detection-system-for-steel-skeleton-size-based-on-machine-vision
#17
JOURNAL ARTICLE
Huaxue Jin, Wei Fan, Xiaoya Chen, Wenbiao You, Ruifang Ye
Currently, most buildings are constructed using prefabricated concrete slabs supported by a steel skeleton that is generally tied and welded manually. However, if the overall size of the skeleton is incorrect and this error is not noticed before the concrete is poured, then a huge waste is incurred by having to scrap all the prefabricated slabs. Therefore, we propose an automatic system for measuring the frame size needed for prefabricated slabs made of reinforced concrete using LabVIEW and the NI Vision library of machine-vision functions to perform image processing and machine-vision detection...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38511995/application-of-two-dimensional-temperature-response-functions-for-reconstruction-of-divertor-heat-flux-profile-in-commercial-fusion-reactors
#18
JOURNAL ARTICLE
X N S Bui, H Matsuura, Y Hayashi, K Nagaoka, S Masuzaki
To keep the tritium breeding rate TBR > 1 and to meet the high heat load and neutron shielding requirements for the first wall and divertor in fusion demonstration (DEMO) reactors, the number of port plugs and other openings must be limited. To accomplish this, it is necessary to develop alternatives to the use of infrared (IR) thermography to determine the peak heat flux and the heat flux profile onto divertor targets. A divertor tile equipped with multiple temperature monitoring channels can be used to reproduce the temperature profile...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38501937/rapid-hollow-fiber-coating-device-for-thin-film-composite-membrane-preparation
#19
JOURNAL ARTICLE
Dionysios S Karousos, Francesco Chiesa, George V Theodorakopoulos, Mirtat Bouroushian, Evangelos P Favvas
Aligned with the recent trend and imperative to reduce separation layer thickness in gas separation membranes to the nanometer scale in order to raise permeance to levels that can render them competitive with respect to other gas separation technologies, a novel approach and device for fabricating defect-free composite hollow fiber (HF) membranes by dip-coating is described. The presented method avoids the fundamental drawbacks of state-of-the-art techniques for applying a thin gas separation layer onto a porous HF substrate, providing a safe but, at the same time, easily up-scalable way of producing HF membranes at a relatively high production rate...
March 1, 2024: Review of Scientific Instruments
https://read.qxmd.com/read/38501936/scintillator-based-timepix3-detector-for-neutron-spin-echo-techniques-using-intensity-modulation
#20
JOURNAL ARTICLE
Fumiaki Funama, Su-Ann Chong, Matthew Loyd, Kazimierz J Gofron, Yuxuan Zhang, Stephen J Kuhn, Chen Zhang, Michael R Fitzsimmons, Anton Khaplanov, Bogdan Vacaliuc, Lowell Crow, Fankang Li
A scintillator-based Timepix3 (TPX3) detector was developed to resolve the high-frequency modulation of a neutron beam in both spatial and temporal domains, as required for neutron spin-echo experiments. In this system, light from a scintillator is manipulated with an optical lens and is intensified using an image intensifier, making it detectable with the TPX3 chip. Two different scintillators, namely, 6LiF:ZnS(Ag) and 6LiI:Eu, were investigated to achieve the high resolution needed for spin-echo modulated small-angle neutron scattering (SEMSANS) and modulation of intensity with zero effort (MIEZE)...
March 1, 2024: Review of Scientific Instruments
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