Ping’an Peng
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View article: Chemical structural variations of asphaltene during solvent swelling characterized by 13C nuclear magnetic resonance and X-ray diffraction
Chemical structural variations of asphaltene during solvent swelling characterized by 13C nuclear magnetic resonance and X-ray diffraction Open
The asphaltene plays an important role in hydrocarbon retention and expulsion processes. In this study, the 13C nuclear magnetic resonance and X-ray diffraction were employed to investigate adsorption capacity and chemical structural varia…
View article: Enhanced erosion by continental arc volcanism as a driver of the Cambrian Explosion
Enhanced erosion by continental arc volcanism as a driver of the Cambrian Explosion Open
Nutrient availability and rising oxygen levels are important for the Cambrian Explosion (~540-515 Ma), both of which can be satisfied via enhanced weathering driven by climate and tectonics. Although increased subduction and continental ar…
View article: Chemical structural variations of asphaltene during solvent swelling characterized by 13C nuclear magnetic resonance and X-ray diffraction
Chemical structural variations of asphaltene during solvent swelling characterized by 13C nuclear magnetic resonance and X-ray diffraction Open
In this study, the 13 C nuclear magnetic resonance (NMR) and X-ray diffraction (XRD) were employed to investigate adsorption capacity and chemical structural variations of the asphaltene during the solvent swelling. The results show that t…
View article: Polycyclic aromatics in the Chang’E 5 lunar soils
Polycyclic aromatics in the Chang’E 5 lunar soils Open
Polycyclic aromatics are ubiquitous in the interstellar medium and meteorites, yet the search for lunar polycyclic aromatics remains a significant challenge. Here, we analyze Chang’E-5 lunar soil samples, revealing polycyclic aromatic conc…
View article: Nanoindentation measurements of mechanical properties and creep behavior of Niutitang formation shale rocks, China
Nanoindentation measurements of mechanical properties and creep behavior of Niutitang formation shale rocks, China Open
Shale is a typical source rock and reservoir rock for oil and gas production. Accurate estimation of its mechanical properties and creep behavior is challenging due to the multiphase and multiscale structure of this rock. In this study, we…
View article: Examining the reliability of current micro-and nano-indentation-based rock mechanical upscaling schemes: a comprehensive comparison with uniaxial/triaxial macroscopic mechanical testing
Examining the reliability of current micro-and nano-indentation-based rock mechanical upscaling schemes: a comprehensive comparison with uniaxial/triaxial macroscopic mechanical testing Open
Shale and marlstone are two typical rocks for gas reservoirs and caprocks for the underground storage of carbon dioxide. Accurately estimating their mechanical properties is challenging due to these rocks' multiphase and multiscale structu…
View article: Molecular insight into aqueous-phase photolysis and photooxidation of water-soluble organic matter emitted from biomass burning and coal combustion
Molecular insight into aqueous-phase photolysis and photooxidation of water-soluble organic matter emitted from biomass burning and coal combustion Open
Biomass and coal combustion represent substantial contributors to atmospheric water-soluble organic matter (WSOM). It experienced intense photochemical oxidation once entered atmospheric environment, but the resulting changes in WSOM are l…
View article: Association of pericoronary inflammation with atherosclerotic plaque progression in diabetic patients with improved modifiable cardiovascular risk factors: a longitudinal CCTA cohort study
Association of pericoronary inflammation with atherosclerotic plaque progression in diabetic patients with improved modifiable cardiovascular risk factors: a longitudinal CCTA cohort study Open
In this longitudinal CCTA cohort of T2DM patients with improved mCRFs, increased pericoronary inflammation was associated with the progression of atherosclerotic plaque, particularly non-calcified plaque.
View article: PSO-NMPC control strategy based path tracking control of mining LHD (scraper)
PSO-NMPC control strategy based path tracking control of mining LHD (scraper) Open
The automation of underground articulated vehicles is a critical step in advancing digital and smart mining. Current nonlinear model predictive control (NMPC) controllers face challenges such as delays in turning on large curvature paths a…
View article: Aqueous secondary formation substantially contributes to organophosphate esters in aerosols
Aqueous secondary formation substantially contributes to organophosphate esters in aerosols Open
Chemicals of emerging concern (CECs), like organophosphate esters (OPEs), are toxic substances threatening human/wildlife health. Yet the atmospheric transformation of CECs remains poorly understood. Here we combine field measurements and …
View article: Evolution of mechanical properties of organic-rich shale during thermal maturation
Evolution of mechanical properties of organic-rich shale during thermal maturation Open
Accurate assessment of the mechanical properties of organic matter, clay matrix, and bulk shale during maturation remains a challenge. Here, we aim to assess the mechanical properties of organic-rich shale during maturation using a combina…
View article: Enrichment Mechanism of Polymetallic Elements at the Base of the Niutitang Formation in Southeast Chongqing
Enrichment Mechanism of Polymetallic Elements at the Base of the Niutitang Formation in Southeast Chongqing Open
Polymetallic enrichment layers are commonly found at the base of the Lower Cambrian and extensively distributed across the Upper Yangtze Platform, yet their genetic models remain controversial. This study systematically collected samples f…
View article: Generation Potential and Kinetics of Gaseous Hydrocarbons from Upper Paleozoic Carboniferous Benxi Formation Mudstone in Ordos Basin, China
Generation Potential and Kinetics of Gaseous Hydrocarbons from Upper Paleozoic Carboniferous Benxi Formation Mudstone in Ordos Basin, China Open
Industrial quantities of tight gas from the Carboniferous Benxi Formation have been found in the southern Ordos Basin. The source and contributions from mudstone and coal in the Benxi Formation to the tight gas are still unclear, and the h…
View article: Creep behavior of marine Wufeng–Longmaxi Formation shales in the Sichuan Basin, Southwest China characterized at micro scale: A case study of exploration well SQ-1 in Sanquan Town, Nanchuan District, Chongqing
Creep behavior of marine Wufeng–Longmaxi Formation shales in the Sichuan Basin, Southwest China characterized at micro scale: A case study of exploration well SQ-1 in Sanquan Town, Nanchuan District, Chongqing Open
Creep behavior is a very important attribute of shale and is crucial in the design of hydraulic fracturing schemes to ensure the long-term stable development of shale gas. However, how different shale minerals, organic matter, bedding plan…
View article: Different formation pathways of nitrogen-containing organic compounds in aerosols and fog water in northern China
Different formation pathways of nitrogen-containing organic compounds in aerosols and fog water in northern China Open
While aqueous-phase processing is known to contribute to the formation of nitrogen-containing organic compounds (NOCs), the specific pathways involved remain poorly understood. In this study, we aimed to characterize the NOCs present in bo…
View article: Formation of In‐Cloud Aqueous‐Phase Secondary Organic Matter and Related Characteristic Molecules
Formation of In‐Cloud Aqueous‐Phase Secondary Organic Matter and Related Characteristic Molecules Open
The formation process of in‐cloud aqueous‐phase secondary organic matter (aqSOM) and its characteristics are unclear. Herein, water‐soluble inorganic ions, oxalate, and water‐soluble organic carbon (WSOC) were determined in cloud water and…
View article: Distribution, chemical, and molecular composition of high and low molecular weight humic-like substances in ambient aerosols
Distribution, chemical, and molecular composition of high and low molecular weight humic-like substances in ambient aerosols Open
Humic-like substances (HULIS) encompass a continuum of molecular weight (MW) ranges, yet our understanding of how HULIS characteristics vary with MW is still limited and not well established. In this study, a combination of ultrafiltration…
View article: Different Formation Pathways of Nitrogen-containing Organic Compounds in Aerosols and Fog Water in Northern China
Different Formation Pathways of Nitrogen-containing Organic Compounds in Aerosols and Fog Water in Northern China Open
While aqueous-phase processing contributes to the formation of nitrogen-containing organic compounds (NOCs), the detailed pathways are not well understood. In this study, the molecular composition of NOCs in both pre-fog aerosols and fog w…
View article: Combining atomic force microscopy and nanoindentation helps characterizing in-situ mechanical properties of organic matter in shale
Combining atomic force microscopy and nanoindentation helps characterizing in-situ mechanical properties of organic matter in shale Open
The quantification of mechanical properties of organic matter in shale is of significance for the fine prediction and characterization of shale reservoir's mechanical properties. Due to the micron-sized and dispersed distribution of organi…
View article: Comment on egusphere-2023-2029
Comment on egusphere-2023-2029 Open
Abstract. Humic-like Substances (HULIS) encompass a continuum of molecular weight (MW) ranges, yet our understanding of how HULIS characteristics vary with MW is still limited and not well-established. In this study, a combination of ultra…
View article: Distribution, chemical and molecular composition of high and low-molecular-weight humic-like substances in ambient aerosols
Distribution, chemical and molecular composition of high and low-molecular-weight humic-like substances in ambient aerosols Open
Humic-like Substances (HULIS) encompass a continuum of molecular weight (MW) ranges, yet our understanding of how HULIS characteristics vary with MW is still limited and not well-established. In this study, a combination of ultrafiltration…
View article: Occurrence and carcinogenic potential of airborne PBDD/Fs and PCDD/Fs around a large-scale municipal solid waste incinerator: A long-term passive air sampling study
Occurrence and carcinogenic potential of airborne PBDD/Fs and PCDD/Fs around a large-scale municipal solid waste incinerator: A long-term passive air sampling study Open
Municipal solid waste incinerator (MSWI) not only is deemed one of the uppermost sources of polychlorinated dibenzo-p-dioxins/furans (PCDD/Fs), but also produces substantial amount of polybrominated dibenzo-p-dioxins/furans (PBDD/Fs) owing…