A5079892759- Geology and Paleoclimatology Research
- Isotope Analysis in Ecology
- Paleontology and Stratigraphy of Fossils
- Hydrocarbon exploration and reservoir analysis
- Planetary Science and Exploration
- Methane Hydrates and Related Phenomena
- Astro and Planetary Science
- Polar Research and Ecology
- Geochemistry and Geologic Mapping
- Nuclear Physics and Applications
- Field-Flow Fractionation Techniques
- Groundwater and Isotope Geochemistry
- Minerals Flotation and Separation Techniques
- Geological Studies and Exploration
- Cryospheric studies and observations
- Gas Dynamics and Kinetic Theory
- Geological and Geophysical Studies
- Marine animal studies overview
- Mine drainage and remediation techniques
- Marine and coastal ecosystems
- Avian ecology and behavior
- Soil Carbon and Nitrogen Dynamics
- Scientific Research and Discoveries
- Metal Extraction and Bioleaching
- Geochemistry and Elemental Analysis
Yunnan University
2025
Energy Research Institute
2025
Jilin Normal University
2024
Huazhong University of Science and Technology
2005-2024
Rice University
2018-2024
Zhejiang University
2023
University of Houston
2017-2019
Louisiana State University
2008-2018
Johnson Space Center
2012-2018
China University of Geosciences (Beijing)
2013
Isotope ratio measurements have become extremely precise in recent years, with many approaching parts-per-million (ppm) levels of precision. However, seemingly innocuous errors signal baselines, which exist only when gas enters the instrument, might lead to significant errors. These "pressure-baseline" (PBL) offsets may a variety origins, such as incoherent scattering analyte, isobaric interferences, or electron ablation from walls flight tube. They are probably present all but...
A fiber structure composed of hollow carbon spheres and transition metal catalysts has been developed presented, using a strategy that combines electrostatic spinning with heat treatment. It demonstrates improved...
Investigation of climatic conditions prior to the Sturtian glaciations is critical understanding trigger mechanism for series Neoproterozoic global glaciations. In this study, we report high-resolution chemical index alteration (CIA) records in sediments South China glaciation (820~720 Ma). Our results showed there occurred multiple climate cooling before China: (1) a episodic and possibly periods from ca. 750 Ma 725 Ma, which also caused some diachronous regional glaciations; (2) permanent...
We describe an approach for determining biological N2 production in soils based on the proportions of naturally occurring 15N15N N2. Laboratory incubation experiments reveal that production, whether by denitrification or anaerobic ammonia oxidation, yields are within 1‰ predicted a random distribution 15N and 14N atoms. This relatively invariant isotopic signature contrasts with atmosphere, which has excess 19.1 ± 0.1‰. Depth profiles gases agricultural from Kellogg Biological Station...
Isotope fractionation resulting from gas diffusion along a thermal gradient has always been considered entirely mass-dependent. A previous report, however, showed that non-mass-dependent (17)O anomalies can be generated simply by subjecting O(2) in an enclosure to gradient. To explore the underlying mechanism for anomalies, we tested effect of pressure, duration experiment, and geometry apparatus on as well (33)S or (36)S SF(6) gas. The results are consistent with our proposal previously...
The Antarctic ice cap significantly affects global ocean circulation and climate. Continental glaciogenic sedimentary deposits provide direct physical evidence of the glacial history interior, but these data are sparse. Here we investigate a new indicator sheet evolution: sulfates within from Lewis Cliff Ice Tongue central Transantarctic Mountains. exhibit unique isotope signatures, including δ34S up to +50‰ for mirabilite evaporites, Δ17O +2.3‰ dissolved sulfate contemporary melt-water...
The quality of Ti alloy casing is crucial for the safe and stable operation aero engines. However, fluctuation key process parameters during investment casting titanium casings has a significant influence on volume number porosity defects, this cannot be effectively suppressed at present. Therefore, paper proposes strategy to control shrinkage number. This study constructed multiple regression prediction models neural network ZTC4 by simulating gravity process. results show that model cavity...
Abstract Cryogenic or heating methods have been widely used in experiments involving gas purification isolation and studying phase changes among solids, liquids, gases for more than a century. Thermal gradients are often present these routine processes. While stable isotopes of an element known to fractionate under thermal gradient, the largely diffusion‐driven fractionation is assumed be entirely mass‐dependent. We report here, however, that distinct non‐mass‐dependent oxygen isotope can...
The Dingqinghu Formation oil shale, located in the centre of Lunpola basin, represents a potential large lacustrine shale resource Tibet.A geochemical investigation was performed to reconstruct paleoenvironment and paleoclimate during deposition.The total organic carbon (TOC) contents (1.46-11.85%),S 2 values (4.79-115.80 mg HC/mg rock) HI (328-1040 TOC) samples are high, indicate that has good source rock potential.The thermal maturity assessed from PI (0.01-0.09) T max (429-440 °C) shows...
Abstract The Steptoean Positive Carbon Isotope Excursion (SPICE) is globally distributed in late Cambrian sedimentary records but controversially heterogeneous its magnitudes. Here we use multiple geochemical proxies to investigate the carbonates from Tangwangzhai section North China, which were deposited a shallow coastal environment with three depositional sequences (S1–S3). Each sequence comprises transgressive systems tract (TST) and highstand (HST). REE + Y trace element are consistent...