J Chromatogr A
State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences, Wuhan 430074, China. Electronic address:
Published: February 2015
Using comprehensive two-dimensional gas chromatography coupled to time-of-flight mass spectrometry (GC×GC/TOFMS), volatile and semi-volatile organic compounds in crude oil samples from different reservoirs or regions were analyzed for the development of a molecular fingerprint database. Based on the GC×GC/TOFMS fingerprints of crude oils, principal component analysis (PCA) and cluster analysis were used to distinguish the oil sources and find biomarkers. As a supervised technique, the geological characteristics of crude oils, including thermal maturity, sedimentary environment etc., are assigned to the principal components. The results show that tri-aromatic steroid (TAS) series are the suitable marker compounds in crude oils for the oil screening, and the relative abundances of individual TAS compounds have excellent correlation with oil sources. In order to correct the effects of some other external factors except oil sources, the variables were defined as the content ratio of some target compounds and 13 parameters were proposed for the screening of oil sources. With the developed model, the crude oils were easily discriminated, and the result is in good agreement with the practical geological setting.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1016/j.chroma.2014.12.068 | DOI Listing |
J Colloid Interface Sci
January 2025
Institute of Physical and Theoretical Chemistry, University of Regensburg D-93053 Regensburg, Germany. Electronic address:
Hypothesis: Due to its huge polar headgroup, octaoxyethylene octyl ether carboxylic acid (CECHCOOH = Akypo LF2™) is supposed not to be able to change its curvature sufficiently to form bicontinuous microemulsions. Instead, upon adding an oil to the binary water - surfactant system, excess oil could be squeezed out or a biliquid foam could form.
Experiments: An auto-dilution setup was used to record small-angle X-ray scattering data along six dilution lines in the newly established phase diagram of the ternary system 2-ethylhexanol - CECHCOOH - water.
ACS Sustain Chem Eng
January 2025
Department of Chemistry and Biochemistry, Rowan University, Glassboro, New Jersey 08028, United States.
Ethyl cellulose (EC) is a biocompatible, renewable, and recyclable material with diverse sources, making it an attractive candidate for industrial applications. Electrospinning has gained significant attention for the production of EC fibers. However, conventional electrospinning methods face challenges such as bead formation, low yield, and the absence of porous internal structures, limiting both the functional performance and scalability.
View Article and Find Full Text PDFPLoS One
January 2025
Automation School Guangdong University of Petrochemical Technology, Maoming, Guangdong, China.
Centrifugal compressors are widely used in the oil and natural gas industry for gas compression, reinjection, and transportation. Fault diagnosis and identification of centrifugal compressors are crucial. To promptly monitor abnormal changes in compressor data and trace the causes leading to these data anomalies, this paper proposes a security monitoring and root cause tracing method for compressor data anomalies.
View Article and Find Full Text PDFInt J Biol Macromol
January 2025
Technical University of Munich (TUM), TUM School of Life Sciences Weihenstephan, Alte Akademie 8, 85354 Freising, Germany; Fraunhofer Institute for Process Engineering and Packaging IVV, Giggenhauser Str. 35, 85354 Freising, Germany. Electronic address:
Macauba fruit pulp (Acrocomia aculeata) is an emerging oil source. After de-oiling, the macauba pulp meal (MPM) offers a dietary fiber content of 40-50 %, which mainly comprises cell wall polysaccharides (CWP). The present work aimed to assess the potential of MPM as an innovative source of sustainable food polysaccharides.
View Article and Find Full Text PDFJ Environ Manage
January 2025
Logistikum, University of Applied Sciences Upper Austria, 4400, Steyr, Austria; Supply Chain Intelligence Institute Austria, Vienna, Austria; Faculty of Business & Entrepreneurship, Daffodil International University, Daffodil Smart City, Ashulia, Dhaka, Bangladesh. Electronic address:
Environmental taxes play a critical role in mitigating air pollution and fostering sustainability by internalizing the social costs of environmental damage. By imposing financial disincentives on polluters, these taxes encourage cleaner practices and technological innovation. Using panel ARDL models, this study examines the impact of environmental taxes on CO₂ emissions across 38 OECD countries, accounting for cross-sectional dependence, non-stationarity, and heterogeneity.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!
© LitMetric 2025. All rights reserved.