Results 81 to 90 of about 3,931 (172)

High-sensitivity methane detection based on QEPAS and H-QEPAS technologies combined with a self-designed 8.7 kHz quartz tuning fork

Photoacoustics
Methane (CH4) is a greenhouse gas as well as being flammable and explosive. In this manuscript, quartz-enhanced photoacoustic spectroscopy (QEPAS) and heterodyne QEPAS (H-QEPAS) exploring a self-designed quartz tuning fork (QTF) with resonance frequency (
Tiantian Liang, Shunda Qiao, Yanjun Chen, Ying He, Yufei Ma   +4 more
doaj   +1 more source

Quartz Enhanced Photoacoustic Spectroscopy Based Gas Sensor with a Custom Quartz Tuning Fork

Proceedings, 2018
We have fabricated a custom quartz tuning fork (QTF) with a reduced fundamental frequency, a larger gap between the prongs and the best quality factor in air at atmospheric conditions ever reported.
Maxime Duquesnoy, Guillaume Aoust, Jean-Michel Melkonian, Raphaël Lévy, Myriam Raybaut, Antoine Godard   +5 more
doaj   +1 more source

Photoacoustic detection of stimulated emission pumping in p-difluorobenzene [PDF]

, 1984
Photoacoustic detection has been used to monitor a stimulated emission pumping process in p‐difluorobenzene. Using the Ã^(1)B_(2u)5^1 state as an intermediate, several vibrational levels of the ground electronic state were populated.
Kuppermann, A., Moll, D. J., Parker, G. R., Jr.   +2 more
core  

Confocal Raman microspectroscopy for spatially resolved tissue characterisation of disease‐linked spectra‐pathological signatures

Clinical and Translational Medicine, Volume 15, Issue 10, October 2025.
Confocal Raman microspectroscopy for spatially resolved tissue analysis: technology setup, spectra‐pathological signatures derived from computational methods, and tissue‐level insights for biomedical research and clinical applications. Abstract Raman spectroscopy is a versatile analytical technique for highly specific molecular characterisation of ...
Nektarios A. Valous, Inka Zörnig, Dirk Jäger   +2 more
wiley   +1 more source

Field measurements of trace gases and aerosols emitted by peat fires in Central Kalimantan, Indonesia, during the 2015 El Nino [PDF]

, 2016
. Peat fires in Southeast Asia have become a major annual source of trace gases and particles to the regional–global atmosphere. The assessment of their influence on atmospheric chemistry, climate, air quality, and health has been uncertain partly due to
A. D. Nurhayati, B. H. Saharjo, C. E. Stockwell, C. E. Stockwell, D. R. Blake, E. A. Stone, E. I. Putra, E. I. Putra, I. Albar, I. J. Simpson, K. C. Ryan, K. C. Ryan, M. A. Cochrane, R. J. Yokelson, T. Jayarathne   +14 more
core   +3 more sources

Stable near‐infrared‐IIb dyes based on bis‐Pd(II) complexes of bis(TIPS‐ethynyl)‐substituted doubly N‐confused hexaphyrins

Journal of the Chinese Chemical Society, Volume 72, Issue 10, Page 1090-1100, October 2025.
A novel anisotropically π‐extended hexaphyrin dye, t‐Pd2‐3, exhibits abnormally low‐energy absorption and emission beyond 1500 nm within the NIR‐IIb biological window. The specific optical feature of t‐Pd2‐3 contributed to its being utilized as a NIR‐IIb‐excitation‐induced photoacoustic contrast agent for deeper tissue imaging applications. Abstract We
Yuriha Nishiguchi, Aninda Ghosh, Koki Ogasahara, Yoshihisa Yamaoka, Yuhsuke Yasutake, Susumu Fukatsu, Hiroyuki Furuta, Masatoshi Ishida   +7 more
wiley   +1 more source

Magnetically Controllable and Degradable Milliscale Swimmers as Intraocular Drug Implants

Advanced Science, Volume 12, Issue 34, September 11, 2025.
Magnetically controllable degradable milliscale swimmers (MDMS) offer a promising alternative to commercial intraocular drug implants, reducing complications like implant dislocation and uncontrolled drug release. MDMS achieve high velocities in ocular environments, enable real‐time imaging, and deliver drugs effectively without disrupting retinal ...
Erdost Yildiz, Ugur Bozuyuk, Eray Yildiz, Fan Wang, Mertcan Han, Alp Can Karacakol, Devin Sheehan, Yan Yu, Metin Sitti   +8 more
wiley   +1 more source

In vivo carbon nanotube-enhanced non-invasive photoacoustic mapping of the sentinel lymph node [PDF]

, 2009
Sentinel lymph node biopsy (SLNB), a less invasive alternative to axillary lymph node dissection (ALND), has become the standard of care for patients with clinically node-negative breast cancer.
Green, Danielle, Pramanik, Manojit, Sitharaman, Balaji, Song, Kwang Hyun, Swierczewska, Magdalena, Wang, Lihong V.   +5 more
core   +1 more source

Optomechanical Properties of Swine Skin Tissue Treated With a Nontoxic Optical Clearing Agent

Journal of Biophotonics, Volume 18, Issue 8, August 2025.
Experimental process to evaluate the optomechanical and structural properties of individual macroscopic layers in swine skin tissues treated with a nontoxic optical clearing agent. ABSTRACT This study evaluated the optomechanical and structural properties of individual macroscopic layers in swine skin tissues treated with a nontoxic optical clearing ...
Noemi Correa, Minji Suh, Abdul Mohizin, Jinu Sudhakaran, Kee Sung Lee, Jung Kyung Kim   +5 more
wiley   +1 more source

Selectivity enhancement in photoacoustic gas analysis via phase-sensitive detection at high modulation frequency [PDF]

, 2010
A method for detecting a target fluid in a fluid sample comprising a first fluid and the target fluid using photoacoustic spectroscopy (PAS), comprises a) providing a light source configured to introduce an optical signal having at least one wavelength ...
Kosterev, Anatoliy
core   +1 more source