Results 81 to 90 of about 594,359 (210)

Quartz-Tuning-Fork-Enhanced Spectroscopy Based on Fast Fourier Transform Algorithm

Frontiers in Physics, 2020
In this paper, a gas sensing technique based on quartz-crystal-tuning-fork-enhanced spectroscopy (QCTFES) and wavelength modulation spectroscopy (WMS) is reported.
Guangxiang Yang, Linguang Xu, Hua Liang, Jingsong Li   +3 more
doaj   +1 more source

Tuning forks with optimized geometries for quartz-enhanced photoacoustic spectroscopy

Optics Express, 2019
We report on the design, realization, and performance of novel quartz tuning forks (QTFs) optimized for quartz-enhanced photoacoustic spectroscopy (QEPAS). Starting from a QTF geometry designed to provide a fundamental flexural in-plane vibrational mode resonance frequency of ~16 kHz, with a quality factor of 15,000 at atmospheric pressure, two novel ...
Pietro Patimisco, Angelo Sampaolo, Marilena Giglio, Stefano dello Russo, Verena Mackowiak, Hubert Rossmadl, Alex Cable, Frank K. Tittel, Vincenzo Spagnolo   +8 more
openaire   +3 more sources

How small changes to methylated piperidinium cations impact the synthesis of zeolite SSZ‐39

AIChE Journal, EarlyView.
Abstract Here we report a synthesis study of SSZ‐39 with four different organic structure directing agents (OSDA). The goal was to determine how subtle changes to the OSDA architecture impact crystallization kinetics, material composition, and other properties.
Onyinyechukwu Ukagha, Daniel F. Shantz
wiley   +1 more source

Deep Learning–Based Extraction of Promising Material Groups and Common Features from High‐Dimensional Data: A Case of Optical Spectra of Inorganic Crystals

Advanced Intelligent Discovery, EarlyView.
We report a novel interpretation method for deep learning models based on feature extraction and clustering. Applying this method to an atomistic line graph neural network (ALIGNN) model trained on optical absorption spectra of 2,681 inorganic compounds obtained from first‐principles calculations, we successfully identify key factors underlying ...
Akira Takahashi, Yu Kumagai, Arata Takamatsu, Fumiyasu Oba   +3 more
wiley   +1 more source

Planar Laser-Based QEPAS Trace Gas Sensor

Sensors, 2016
A novel quartz enhanced photoacoustic spectroscopy (QEPAS) trace gas detection scheme is reported in this paper. A cylindrical lens was employed for near-infrared laser focusing.
Yufei Ma, Ying He, Cheng Chen, Xin Yu, Jingbo Zhang, Jiangbo Peng, Rui Sun, Frank K. Tittel   +7 more
doaj   +1 more source

Bismuth‐Based Semiconductors in Photocatalytic CO2 Reduction: Catalysts, Progress, and Future Perspectives

Carbon and Hydrogen, EarlyView.
This review systematically summarizes research progress on bismuth‐based semiconductor photocatalytic materials in the field of CO2 reduction. It focuses on elucidating the mechanisms by which four modification strategies—including heteroatom doping, oxygen vacancy engineering, microstructural control, and heterostructure fabrication—regulate band ...
Shuisen He, Guodong Zhang, Mengchi Guo, Song Zhong, Jie Yang, Tongrui Zhang, Xingye Zeng   +6 more
wiley   +1 more source

1D U-Net Enhanced QEPAS Sensor for Trace Water Vapor Detection

Optics
We report a deep learning-assisted quartz-enhanced photoacoustic spectroscopy (QEPAS) sensor for trace water vapor detection in air. A 1392 nm butterfly-packaged DFB laser is wavelength-modulated at f0/2, and the QEPAS signal is retrieved by second ...
Huiming Xiao, Jiahui Wu, Haoyang Lin, Lihao Wang, Jianfeng He, Leqing Lin, Ruobin Zhuang, Guantian Hong, Jiabao Xie, Jianhui Yu, Wenguo Zhu, Yongchun Zhong, Zhigang Song, Huadan Zheng   +13 more
doaj   +1 more source

Small‐Crystal SAPO‐34 Preparation by Regulating Precursor Mixing Temperature for Methanol‐to‐Olefins Conversion

Carbon and Hydrogen, EarlyView.
By tuning the initial mixing temperature from 0°C to 80°C, the crystal size of SAPO‐34 can be adjusted from micro to nanoscale, reflecting a shift from classical single‐crystal growth at low temperatures to non‐classical polycrystalline aggregation at high temperatures.
Guanghua Liang, Junlan Guo, Xi Zhang, Ruiying Wang, Fene Gao   +4 more
wiley   +1 more source

Design, Development and Testing of Quartz Tuning Fork Temperature Sensor

, 2011
In this paper, a low cost quartz tuning fork temperature sensor adopting H-shaped tuning fork resonator to address miniaturization, high resolution and high stability has been designed, developed and tested.
Jun Xu, Bo You, Jing Ma
core   +1 more source

Acoustic Detection Module Design of a Quartz-Enhanced Photoacoustic Sensor

Sensors, 2019
This review aims to discuss the latest advancements of an acoustic detection module (ADM) based on quartz-enhanced photoacoustic spectroscopy (QEPAS). Starting from guidelines for the design of an ADM, the ADM design philosophy is described.
Tingting Wei, Hongpeng Wu, Lei Dong, Frank K. Tittel   +3 more
doaj   +1 more source