22 research outputs found
Physical simulation and quantitative characterization of fault zones based on ring-shear experiments
Get PDFFault zones play a key role in controlling subsurface fluid migration, influencing hydro-carbon accumulation, CO₂ sequestration, and geo-energy storage safety. Most previous experimental studies, however, have been restricted to static outcrop or core observations, which fail to capture the progressive evolution of fault zone structures in time as a response to changing stresses. Moreover, existing analogue experiments often use unconsolidated sediments, which cannot accurately represent brittle faulting in consolidated rocks, and quantitative analyses remain limited. To address these challenges, a new method based on ring-shear experiments was developed to physically simulate fault zone formation in consolidated sandstones. The method simulates shear deformation under variable stress and displacement conditions, followed by multi-scale quantitative analyses, including computed tomography imaging, thin section analysis, and porosity-permeability testing under confining pressure. This comprehensive testing routine allows to quantify changes in fault zone thickness, particle and pore size distributions, and grain orientations during progressive deformation and depending on shear parameters. The results demonstrate systematic relationships between effective normal stress, shear displacement, and fault zone structural attributes. The fault zone thickness shows a nonlinear trend with stress, while cataclasis and compaction intensify with increasing displacement. This work provides a methodological foundation for future applications in fault seal analysis, fluid flow modeling, and numerical simulation, offering a practical reference for petroleum systems studies, hydrogeology, and underground gas storage including CO₂ and hydrogenDocument Type: Original articleCited as: Jiang, M., Jin, Y., Fu, X., Liu, Q., Misch, D. Physical simulation and quantitative characterization of fault zones based on ring-shear experiments. Advances in Geo-Energy Research, 2025, 17(3): 256-266. https://doi.org/10.46690/ager.2025.09.0
Research and application of engine electronic control training bench based on Changan Ford
Get PDFWhether it is responsible for the professional teaching of vehicle vocational college teachers, or the students who study auto
repair on campus, they should master the structure, principle and fault maintenance of the latest automobile circuit control system to diff erent
degrees, otherwise it is diffi cult to match the development of modern automobile new technology. In the actual teaching process found,
fi rst of all, for the real car is diffi cult to set idle or start the fault demonstration process, students are diffi cult to understand the principle of
these failures, must use the engine electronic control training platform to meet the teaching needs. Secondly, most of today’s automotive
companies recruit college graduates who require talents with specialized brand service skills. Therefore, higher vocational colleges must
cooperate with enterprises to train specialized automobile service talents
Changes in the Quality and Microbial Communities of Precooked Seasoned Crayfish Tail Treated with Microwave and Biological Preservatives during Room Temperature Storage
No full textThe qualities of precooked foods can be significantly changed by the microorganisms produced during room temperature storage. This work assessed the effects of different antibacterial treatments (CK, without any treatment; microwave treatment, MS; microwave treatment and biological preservatives, MSBP) on the physicochemical properties and microbial communities of precooked crayfish tails during room temperature storage. Only the combination of microwave sterilization and biological preservatives significantly inhibited spoilage, as evidenced by the total viable count (4.15 log CFU/g) after 3 days of room temperature storage, which satisfied the transit time of most logistics companies in China. Changes in pH and TVB-N were also significantly inhibited in the MSBP group compared with those in the CK and MS groups. More than 30 new volatile compounds were produced in the CK groups during room temperature storage. However, in the MSBP groups, the volatile compounds were almost unchanged. The correlations between the microbial composition and volatile compounds suggested that specific bacterial species with metabolic activities related to amino acid, energy, cofactor, and vitamin metabolism, as well as xenobiotics biodegradation and metabolism, were responsible for the changes in volatile compounds. These bacteria included Psychrobacter, Arthrobacter, Facklamia, Leucobacter, Corynebacterium, Erysipelothrix, Devosia, Dietzia, and Acidovorax. Overall, our findings provide a foundation for the development of strategies to inhibit spoilage in precooked crayfish tails stored at room temperature
The complete chloroplast genome sequence of Vitis davidii Foex strain ‘SJTU003’
No full textIn the present study, the complete chloroplast genome of Vitis davidii Foex strain ‘SJTU003’ was assembled and subjected to phylogenetic analysis. This chloroplast genome of ‘SJTU003’ was 161,335 bp in length, including two inverted repeat regions (IRa and IRb) that were separated by a large single-copy region (89,570 bp) and a small single-copy region (19,059 bp). The genome contained 133 genes, including 88 protein-coding genes, 37 tRNA genes, and 8 rRNA genes. Phylogenetic analysis indicated that V. davidii is most closely related to Vitis flexuosa and Vitis amurensis
Feasibility of using Nakagami distribution in evaluating the formation of ultrasound-induced thermal lesions
No full textThe complete chloroplast genome sequence of Vitis hancockii
No full textIn this study, the complete chloroplast genome of Vitis hancockii was assembled for the first time. This genome was 161,205 bp in length, containing a large single copy region (89,397 bp) and a small single copy region (19,100 bp), seperated by two inverted repeat regions. The genome harbored 133 genes, including 88 protein-coding genes, 37 tRNA genes, and eight rRNA genes. Phylogenetic tree analysis showed that V. hancocikk was the closest related to Vitis ficifolia
Compare ultrasound-mediated heating and cavitation between flowing polymer- and lipid-shelled microbubbles during focused ultrasound exposures
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Heterogeneous nuclear ribonucleoprotein K (hnRNP K) is a tissue biomarker for detection of early Hepatocellular carcinoma in patients with cirrhosis
No full textBackground: Hepatocellular carcinoma (HCC) is one of the most common malignant tumors occurring mainly in patients with chronic liver disease. Detection of early HCC is critically important for treatment of these patients. Methods: We employed a proteomic profiling approach to identify potential biomarker for early HCC detection. Based on Barcelona Clinic Liver Cancer (BCLC) staging classification, 15 early HCC and 25 late HCC tissue samples from post-operative HCC patients and their clinicopathological data were used for the discovery of biomarkers specific for the detection of early HCC. Differential proteins among cirrhotic, early, and late tissue samples were separated by two-dimensional gel electrophoresis (2-DE) and subsequently identified by mass spectrometry (MS). Receiver operating characteristic (ROC) curves analysis were performed to find potential biomarkers associated with early HCC. Diagnosis performance of the biomarker was obtained from diagnosis test. Results: Protein spot SSP2215 was found to be significantly overexpressed in HCC, particularly in early HCC, and identified as heterogeneous nuclear ribonucleoprotein K (hnRNP K) by tandem mass spectrometry (MALDI TOF/TOF). The overexpression in HCC was subsequently validated by western blot and immunohistochemistry. ROC curve analysis showed that hnRNP K intensity could detect early HCC at 66.67 % sensitivity and 84 % specificity, which was superior to serum alpha-fetoprotein (AFP) in detection of early HCC. Furthermore, the diagnosis test demonstrated, when combined with hnRNP K and serum AFP as biomarker panel to detect early HCC at different cut-off value, the sensitivity and specificity could be enhanced to 93.33 % and 96 %, respectively. Conclusions: hnRNP K is a potential tissue biomarker, either alone or in combination with serum AFP, for detection of early HCC. High expression of hnRNP K could be helpful to discriminate early HCC from a nonmalignant nodule, especially for patients with liver cirrhosis.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000307870900001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701OncologyHematologySCI(E)PubMed11ARTICLE37
H2S formation and enrichment mechanisms in medium to large scale natural gas fields (reservoirs) in the Sichuan Basin
No full textA comprehensive study on the temporal and spatial distribution of H2S accumulations and the geochemical characteristics of sour gas fields (reservoirs) in the Sichuan Basin has been conducted. It has been followed by a series of carefully designed simulation experiments to elucidate an H2S formation mechanism which is able to predict the distribution of H2S. In some reservoirs, for example P2ch(T1f, have sufficient magnesic SO42( and abundant hydrocarbons (palaeo pools) present at sufficiently high temperatures to cause thermochemical sulfate reduction (TSR). This is the major origin of abundant H2S in large to medium scale gas fields. The formation mechanism of highly sour gas fields (reservoirs) is an in-situ reaction under conditions where sufficient source, enough energy supply, suitable reservoir volume and severely reducing environments occur. However, in some areas or strata, such as slope belts or on continental shelf deposits, or formations such as the Jialingjia and Leikoupo Formations, which are dominantly compact carbonatite and have contemporaneously different facies, it is difficult to form abundant H2S. These formations lack a source of sulphur and energy compared to the P2ch(T1f reef flat facies reservoirs. Even though highly sour natural gas migrating from the P2ch(T1f reservoirs is present, H2S is often consumed due to long distance migration and results in hydrocarbon-rich sweet natural gas. This study predicts that the Heichiliang reef flat facies sedimentary zone in northeastern Sichuan to have highly sour natural gas reservoirs. 摘要: ： 通过对四川盆地含硫天然气田（藏）时空分布、地球化学特征及模拟实验结果等的综合研究，揭示H2S形成机理并进行分布预测。P2ch—T1f储集层中足够的含镁SO42-溶液和丰富的烃类（古油藏）在高温条件下发生硫酸盐热化学还原反应（TSR）是四川盆地大中型天然气田中大量H2S形成的主要途径；充足的物源基础、足够的能量供给、适宜的储集空间和苛刻的还原环境下发生的原地反应是高含硫天然气田（藏）形成的主要机制。而以与P2ch—T1f礁滩相储集层同期异相的致密碳酸盐岩为主的斜坡带、陆棚内部以及嘉陵江组、雷口坡组等因缺乏物源、能量等难以形成高丰度H2S，即使有自P2ch—T1f储集层运移而来的高含硫天然气，也因远距离运移H2S被消耗而变为富烃低硫天然气。预测川东北黑池梁礁滩相沉积区有发育高含硫天然气藏的可能性。图4表3参30 Key words: northeastern Sichuan, H2S, TSR, enrichment mechanism, highly sour gas fiel
