The fast and reliable analysis of the natural gas composition requires the simultaneous quantification of numerous gaseous components. To this end, fiber-enhanced Raman spectroscopy is a powerful tool to detect most components in a single measurement using a single laser source. However, practical issues such as detection limit, gas exchange time and background Raman signals from the fiber material still pose obstacles to utilizing the scheme in real-world settings. This paper compares the performance of two types of hollow-core photonic crystal fiber (PCF), namely photonic bandgap PCF and kagomé-style PCF, and assesses their potential for online determination of the Wobbe index. In contrast to bandgap PCF, kagomé-PCF allows for reliable detection of Raman-scattered photons even below 1200 cm, which in turn enables fast and comprehensive assessment of the natural gas quality of arbitrary mixtures.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5753068 | PMC |
| http://dx.doi.org/10.3390/s17122714 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
A Doped Surface Ionization Method for Ion Mobility Spectrometry.
Rapid Commun Mass Spectrom
March 2025
State Key Laboratory of Transducer Technology, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing, China.
Rationale: Exhaled breath can be used for early warning of disease, with organic nitrogen compounds, including triethylamine (TEA), being linked to various medical conditions. Surface ionization ion mobility spectrometry (SI-IMS) facilitates the direct detection of TEA in exhaled breath. However, the presence of multiple ionization products of TEA poses challenges for both quantitative and qualitative analyses.
View Article and Find Full Text PDFGlobal Greenhouse Gas Emissions From Agriculture: Pathways to Sustainable Reductions.
Glob Chang Biol
January 2025
University of Nebraska-Lincoln, Lincoln, Nebraska, USA.
Agriculture serves as both a source and a sink of global greenhouse gases (GHGs), with agricultural intensification continuing to contribute to GHG emissions. Climate-smart agriculture, encompassing both nature- and technology-based actions, offers promising solutions to mitigate GHG emissions. We synthesized global data, between 1990 and 2021, from the Food and Agriculture Organization (FAO) of the United Nations to analyze the impacts of agricultural activities on global GHG emissions from agricultural land, using structural equation modeling.
View Article and Find Full Text PDFStudy on the determination method of excitation load in electrical signal simulation for piezoelectric ultrasonic internal inspection of pipelines.
Sci Rep
December 2024
School of Petroleum and Natural Gas Engineering, Southwest Petroleum University, Chengdu, 610500, China.
Accurately determining the initial acoustic field excitation load of a piezoelectric ultrasonic probe is essential for simulating electrical signals and calculating wall thickness during ultrasonic internal inspection of pipelines. A new method for determining the initial excitation load of the acoustic field is proposed, incorporating the focusing effect of the curved surface of pipelines on the ultrasonic signal from the piezoelectric ultrasonic probe. Finite element models were established for the new and old methods using COMSOL software, facilitating the analysis of the initial acoustic field distribution and associated electrical signal characteristics.
View Article and Find Full Text PDFInvestigation of combustion characteristics of critical quenching hydrogen mixing ratios in the presence of ordered porous media.
Sci Rep
December 2024
College of Safety Engineering, Chongqing University of Science and Technology, Chongqing, 401331, China.
In order to promote low-carbon sustainable development in the ecological environment and improve the efficiency of hydrogen and natural gas energy utilization, this project carried out research on the explosive effects of different thicknesses of ordered porous media on the hydrogen-methane gas mixture. A detailed discussion was conducted based on the critical quenching hydrogen blending ratio under the thicknesses of 50 mm and 60 mm of ordered porous media. The results indicate that the critical quenching hydrogen blending ratio is 9% for a thickness of 50 mm and 20% for a thickness of 60 mm, indicating that greater thickness enhances flame suppression capabilities.
View Article and Find Full Text PDFFates of nutrient elements and heavy metals during thermal conversion of cattle slurry-derived anaerobic digestates.
Bioresour Bioprocess
December 2024
Production Systems Unit, Grasslands and Sustainable Agriculture Group, Natural Resources Institute Finland (Luke), Maaninka, FI-71750, Finland.
Thermal processes are emerging as promising solutions to recovering phosphorus and other nutrient elements from anaerobic digestates. The feasibility of nutrient element recovery depends largely on the fates of nutrient elements and heavy metals during thermal processing. This study assesses the partitioning of macronutrients (N, P, K, Na, Ca and Mg) and heavy metals (Zn, Cu, and Mn) between condensed and gaseous phases during thermal conversion of cattle slurry digestates in gas atmospheres of pyrolysis, combustion, and gasification processes.
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!