Results 51 to 60 of about 3,619,372 (170)

Highly Sensitive Capacitive MEMS for Photoacoustic Gas Trace Detection

Sensors, 2023
An enhanced MEMS capacitive sensor is developed for photoacoustic gas detection. This work attempts to address the lack of the literature regarding integrated and compact silicon-based photoacoustic gas sensors. The proposed mechanical resonator combines
Tarek Seoudi, Julien Charensol, Wioletta Trzpil, Fanny Pages, Diba Ayache, Roman Rousseau, Aurore Vicet, Michael Bahriz   +7 more
doaj   +1 more source

Dual-frequency modulated heterodyne quartz-enhanced photoacoustic spectroscopy

Optics Express, 2023
A novel dual-frequency modulated heterodyne quartz-enhanced photoacoustic spectroscopy (DFH-QEPAS) was demonstrated for what we believe to be the first time in this study. In traditional H-QEPAS, the frequency of modulated sinusoidal wave has a frequency difference (Δ f ) with the resonance ...
Ziting Lang, Shunda Qiao, Tiantian Liang, Ying He, Lei Qi, Yufei Ma   +5 more
openaire   +2 more sources

Cantilever-Enhanced Photoacoustic Spectroscopy of Radioactive Methane [PDF]

, 2020
We report the first high-resolution spectroscopy study of radiocarbon methane, 14CH4. Several absorption lines of the fundamental vibrational band n3 were measured using a continuous-wave mid-infrared optical parametric oscillator with cantilever ...
Lauri Halonen, Vainio, Markku, Halonen, L., Juho Karhu, Karhu, J., Teemu Tomberg, Markus Metsälä, Genoud, G., Markku Vainio, Hieta, Tuomas, Vainio, M., Tuomas Hieta, Tomberg, T., Tomberg, Teemu, Larnimaa, S., Metsälä, Markus, Hieta, T., Karhu, Juho, Halonen, Lauri, Guillaume Genoud, Larnimaa, Santeri, Genoud, Guillaume, Metsälä, M., Santeri Larnimaa   +23 more
core   +1 more source

Multi-pass quartz-enhanced photoacoustic spectroscopy-based trace gas sensing

, 2021
A multi-pass quartz-enhanced photoacoustic spectroscopy (MP-QEPAS)-based trace gas sensor is reported. In MP-QEPAS, a multi-pass laser beam pattern through the prong spacing of a quartz tuning fork (QTF) is obtained by means of two right-angle prisms.
Sampaolo, Angelo, Qiao, Shunda, He, Ying, Lang, Ziting, Ma, Yufei, Tittel, Frank K, Tittel, Frank K., Spagnolo, Vincenzo, Patimisco, Pietro, Ying He, Yufei Ma, Ziting Lang, Frank K. Tittel, Pietro Patimisco, Shunda Qiao, Vincenzo Spagnolo, Angelo Sampaolo   +16 more
core   +1 more source

Decolorization of Ponceau Red 4R with TiO2/ZnO: Effect of calcination temperature and Fe addition

Environmental Progress &Sustainable Energy, EarlyView.
Abstract The photocatalytic degradation of azo dyes using semiconductor oxides has emerged as a promising strategy for wastewater remediation. In this study, pure, mixed, and Fe‐doped oxide catalysts based on Zinc Oxide and Titanium Dioxide were synthesized and evaluated for the degradation of Ponceau 4R under ultraviolet irradiation.
Stefani Castilhos, Fernado Manzotti de Souza, Giane Gonçalves Lenzi, Angelo Marcelo Tusset, Luiz Mario de M. Jorge, Onelia Aparecida Andreo dos Santos   +5 more
wiley   +1 more source

Light intensity correction for quartz-enhanced photoacoustic spectroscopy using photothermal baseline

Frontiers in Physics, 2022
A convenient method of light intensity correction for quartz-enhanced photoacoustic spectroscopy (QEPAS) using photothermal baseline is demonstrated. The laser beam passes through the prongs of the quartz tuning fork (QTF) and then focused on the root of
Xiang Chen, Xiang Chen, Mai Hu, Mai Hu, Hao Liu, Hao Liu, Lu Yao, Zhenyu Xu, Ruifeng Kan   +8 more
doaj   +1 more source

Nitride MXenes Beyond Carbides: Bridging the Gap Between Computational Prediction and Experimental Realization

Advanced Functional Materials, Volume 36, Issue 89, 5 November 2026.
Nitride MXenes remain constrained by a persistent gap between computational prediction and experimental realization. This Review identifies the thermodynamic, kinetic, and chemical barriers limiting their synthesis, critically evaluates emerging fabrication routes, and proposes a multidimensional computational‐experimental framework to accelerate the ...
Naresh Varnakavi, Masoud Soroush
wiley   +1 more source

Conductance-photoacoustic spectroscopy for fast and concurrent sensing of hydrogen and hydrocarbons

Photoacoustics
Accurate and rapid detection of hydrogen and hydrocarbons is critical for safety and efficiency in modern energy, industrial, and environmental systems.
Ruobin Zhuang, Jianfeng He, Haoyang Lin, Huijian Luo, Leqing Lin, Lihao Wang, Bin Liu, Wenguo Zhu, Yongchun Zhong, Jianhui Yu, Markus Sigrist, Huadan Zheng   +11 more
doaj   +1 more source

A Reproducible MRI‐Based Pipeline for Longitudinal Tracking of Laser‐Assisted Bioprinted Cells in Three‐Dimensional Constructs

NMR in Biomedicine, Volume 39, Issue 10, October 2026.
Laser‐assisted bioprinting was used to deposit iron oxide‐labelled endothelial cells in predefined patterns onto SCAP‐seeded gelatin biopapers to assemble multilayer constructs of increasing thickness. T2*‐weighted MRI monitored constructs for up to 35 days.
Mina Medojević, Charles Handschin, Ayako Washio, Malou Lea, Laurence Dallet, Aleksandar Jakovljević, Emeline J. Ribot, Olivia Kérourédan   +7 more
wiley   +1 more source

Quartz-enhanced photoacoustic-photothermal spectroscopy for trace gas sensing

Optics Express, 2021
A trace gas detection technique of quartz-enhanced photoacoustic-photothermal spectroscopy (QEPA-PTS) is demonstrated. Different from quartz-enhanced photoacoustic spectroscopy (QEPAS) or quartz-enhanced photothermal spectroscopy (QEPTS), which detected only one single kind of signal, QEPA-PTS was realized by adding the photoacoustic and photothermal ...
Yinqiu Hu, Shunda Qiao, Ying He, Ziting Lang, Yufei Ma   +4 more
openaire   +2 more sources