A novel and efficient absorption line recovery technique is presented. A micro-electromechanical systems (MEMS) mirror driven by an electrothermal actuator is used to generate laser intensity modulation through the mirror reflection. Tunable diode laser spectroscopy (TDLS) and photoacoustic spectroscopy (PAS) are used to recover the target absorption line profile which is compared with the theoretical Voigt profile. The target gas is 0.01% acetylene (C2H2) in a nitrogen host gas. The laser diode wavelength is swept across the P17 absorption line of acetylene at 1535.4 nm by a current ramp, and an erbium-doped fibre amplifier (EDFA) is used to enhance the optical intensity and increase the signal-to-noise ratio (SNR). A SNR of about 35 is obtained with 100 mW laser power from the EDFA. Good agreement is achieved between the experimental results and the theoretical simulation for the P17 absorption line profile.
Download full-text PDF |
Source |
|---|
Publication Analysis
Top Keywords
Similar Publications
mCNN-glucose: Identifying families of glucose transporters using a deep convolutional neural network based on multiple-scanning windows.
Int J Biol Macromol
January 2025
Department of Computer Science and Engineering, Yuan Ze University, Zhongli, Taoyuan 320315, Taiwan; Graduate program for Biomedical Informatics, Yuan Ze University, Zhongli, Taoyuan 320315, Taiwan. Electronic address:
Glucose transporters are essential carrier proteins that function on the phospholipid bilayer to facilitate glucose diffusion across cell membranes. The transporters play many physiological and pathological roles in addition to absorption and metabolism of fructose in food and the pathogenesis of gastrointestinal diseases. These carrier proteins play an important role in diseases of the nervous system, cardiovascular system, digestive system, and urinary system.
View Article and Find Full Text PDFInteraction of a Novel Dihydroxy Dibenzoazacrown with Different Surfactants: A Physicochemical and Spectroscopic Investigation.
J Phys Chem B
January 2025
Centre for Surface Science, Physical Chemistry Section, Department of Chemistry, Jadavpur University, Kolkata 700032, India.
Interaction of a novel dihydroxy dibenzoazacrown (HDTC) with various surfactants of different charges, for example, anionic (sodium dodecylsulfate, SDS), cationic (dodecyl trimethylammonium bromide, DTAB), cationic gemini (butanediyl-1,4-bis(dimethylcetylammonium bromide), 16-4-16), ionic liquid (1-hexadecyl-3-methylimidazolium chloride, CMImCl), and nonionic (polyoxyethylene sorbitan monostearate, Tween-60), has been investigated at a widespread range of surfactant concentrations (including premicellar, micellar, and postmicellar regime) in 15% (v/v) EtOH medium at room temperature. Several experimental techniques, viz., tensiometry, UV-vis spectroscopy, and steady-state fluorimetry, are implemented to explicate these interactions.
View Article and Find Full Text PDFGas-Phase Fluorescence Excitation Experiments on Cryogenically Cold Rhodamine B Cations Linked to Various Amino Acid Esters.
J Am Soc Mass Spectrom
January 2025
Department of Physics and Astronomy, Aarhus University, Aarhus 8000, Denmark.
Article Synopsis
- FRET (Förster resonance energy transfer) is a technique used in gas-phase structural biology to analyze the structures of biological molecules like peptides and proteins by using donor and acceptor dyes.
- The study investigates how different amino acid (AA) methyl esters connected to a rhodamine dye affect energy transfer, employing cryogenic ion fluorescence spectroscopy for analysis.
- Results reveal that the variation in spectral outputs stems from the conformations of the dye, which are influenced by the AA side chains, and specific angles between two aromatic components that impact energy transfer efficiency.
3D printed cacao-based formulations as nutrient carriers for immune system enhancement.
Curr Res Food Sci
December 2024
School of Pharmacy, Queen's University Belfast, 97 Lisburn Road, Belfast, BT9 7BL, UK.
Article Synopsis
- This study investigates using raw Greek honey in cacao-based materials for 3D printing, focusing on their physical properties and thermal stability.
- It finds that incorporating honey not only improves the nutritional value and taste but also enhances the delivery of Vitamin D3, which is known to support the immune system but is difficult to absorb.
- The research suggests that a 10% concentration of Lavender Honey is optimal for creating a stable and effective 3D-printed product, indicating the potential for these formulations in personalized health supplements and medicine.
Propagation characteristics analysis of high-frequency radio waves in the lower ionosphere layers.
Heliyon
December 2024
Laser and Plasma Research Institute, Shahid Beheshti University, Tehran, 1983969411, Iran.
In this article, the propagation of high-frequency (HF) plane electromagnetic waves through the lower ionosphere is numerically investigated using the real geometry of the Earth's magnetic field in the northern hemisphere. For this purpose, the profiles of electron density and the collision frequency in the layers of the lower ionosphere (D- and E-region) are considered using the reported experimental data for day and night. The reflection, transmission, and absorption coefficients of HF radio waves in the frequency range of 3 to 30 MHz are calculated in the ionosphere plasma.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!