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Mass organic matter accumulation induced by rapid redox variations in lakes:Evidence from the Miaoxi area,Bohai Bay Basin,China

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Journal of Palaeogeography 2025年第01期14卷 291-313页

作者： Peng Sun Hai-Feng Yang fei-long Wang Jun-Pei Yue Yan-fei Gao You-Jun Tang School of Petroleum Engineering Yangtze University Key Laboratory of Exploration Technologies for Oil and Gas Resources Ministry of Education Yangtze University Tianjin Branch of China National Offshore Oil Corporation College of Resource and Environment Yangtze University

The Member 4 of the Paleogene Shahejie Formation(Es4) in the Bohai Bay Basin is interspersed with a set of high-quality source rocks typified as intercalation of red and black mudstones. A large amount of petroleum(crude oil) originates from these source rocks. The Paleocene-Eocene Thermal Maximum(PETM)event occurred during the deposition of Es4 in the Bohai Bay Basin, and the organic matter enrichment model under this event is worth further investigation due to its relationship with and influence on petroleum accumulations. Well LK25-A, as the first oil exploration well drilled into the Es4 in Miaoxi area, serves as a valuable case to study organic matter accumulation. In this study, we integrate total organic carbon(TOC),Rock-Eval pyrolysis, microscopic observation, vitrinite reflectance(VRo), elemental analysis, and gas chromatography-mass spectrometry(GC-MS) to evaluate the hydrocarbon generation potential, organic matter types, thermal maturity, and sedimentary environment of the Es4 in Miaoxi area. The analysis of maceral and rock pyrolysis data reveals that Type I and Type II organic matter make up the majority of Paleogene mudstones in this region. The TOC and rock pyrolysis data show that mudstones in this area have high organic matter abundance and oil-generation potential. The measured vitrinite reflectance distribution of mudstone samples, which ranges from 0.3% to 0.74%, demonstrates that the Paleogene strata are at the immature to mature stage, and the samples from this area contain a sizable amount of bituminite and mineralbituminous groundmass. The analysis of biomarkers in the mudstone samples indicates that most of the mudstones in this area are in lacustrine and brackish-hypersaline lacustrine environment under a reducing condition, and some of the red mudstones in the Es4 are formed under a suboxic condition. Based on the size and morphology of the pyrite framboid, the redox conditions of the water mass during deposition or diagenesis are further

关键词： Hydrocarbon generation potential Biomarkers Optical microscopy Pyrite framboid Elemental geochemistry Red–black beds

Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang fei long Liyuan Han Qifeng Han Yi‑Bing Cheng Yong Peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination

Prediction and stratification for the surgical adverse events after minimally invasive esophagectomy:A two-center retrospective study

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World Journal of Gastroenterology 2025年第3期31卷 50-61页

作者： Qi-Hong Zhong Jiang-Shan Huang fei-long Guo Jing-Yu Wu Mao-Xiu Yuan Jia-Fu Zhu Wen-Wei Lin Sui Chen Zhen-Yang Zhang Jiang-Bo Lin Department of Thoracic Surgery Fujian Medical University Union HospitalFuzhou 350001Fujian ProvinceChina The Graduate School Fujian Medical UniversityFuzhou 350001Fujian ProvinceChina Department of Thoracic Surgery Affiliated Hospital of Jinggangshan UniversityJi’an 343000Jiangxi ProvinceChina

BACKGROUND Minimally invasive esophagectomy(MIE)is a widely accepted treatment for esophageal cancer,yet it is associated with a significant risk of surgical adverse events(SAEs),which can compromise patient recovery and long-term *** preoperative identification of high-risk patients is critical for improving *** To establish and validate a risk prediction and stratification model for the risk of SAEs in patients with *** This retrospective study included 747 patients who underwent MIE at two centers from January 2019 to February *** were separated into a train set(n=549)and a validation set(n=198).After screening by least absolute shrinkage and selection operator regression,multivariate logistic regression analyzed clinical and intraoperative variables to identify independent risk factors for SAEs.A risk stratification model was constructed and validated to predict the probability of *** SAEs occurred in 10.2%of patients in train set and 13.6%in the validation *** with SAE had significantly higher complication rate and a longer hospital stay after *** key independent risk factors identified included chronic obstructive pulmonary disease,a history of alcohol consumption,low forced expiratory volume in the first second,and low albumin *** stratification model has excellent prediction accuracy,with an area under the curve of 0.889 for the training set and an area under the curve of 0.793 for the validation *** The developed risk stratification model effectively predicts the risk of SAEs in patients undergoing MIE,facilitating targeted preoperative interventions and improving perioperative management.

关键词： Surgical adverse events Minimally invasive esophagectomy Esophageal cancer Stratification model Perioperative management

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具有扰动的正切换齐次系统的多项式稳定性

智能计算机与应用 2025年第1期15卷 10-17页

作者：田吉龙飞贵州大学电气工程学院贵州贵阳550025 贵州中医药大学时珍学院信息工程学部贵州修文550200 贵州理工学院人工智能与电气工程学院贵阳550003

本文研究了具有有界外源输入的正切换齐次非线性系统的多项式稳定性,在平均停留时间切换条件下,讨论了向量场为0 详细信息

本文研究了具有有界外源输入的正切换齐次非线性系统的多项式稳定性,在平均停留时间切换条件下,讨论了向量场为0

关键词：正切换非线性系统多项式稳定性外源输入对数收缩平均停留时间

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TA1纯钛平面各向异性变形行为及机制研究

塑性工程学报 2025年第1期32卷 193-200页

作者：王旭刘龙飞卢立伟吴志强湖南科技大学材料科学与工程学院湖南湘潭411201

利用万能材料试验机开展了RD-ND平面内的TA1冷轧纯钛板圆柱试样在应变速率为1×10-2 s-1下的压缩试验,研究了取样方向(RD-0°、RD-45°和RD-90°)对其压缩性能的影响,并利用金相显微镜和电子背散射衍射技术对压缩前后试样的微观组织和... 详细信息

利用万能材料试验机开展了RD-ND平面内的TA1冷轧纯钛板圆柱试样在应变速率为1×10-2 s-1下的压缩试验,研究了取样方向(RD-0°、RD-45°和RD-90°)对其压缩性能的影响,并利用金相显微镜和电子背散射衍射技术对压缩前后试样的微观组织和变形机制进行了研究。结果表明:不同取向圆柱试样的塑性变形流动应力存在显著差异,从RD-0°到RD-90°试样,随着压缩方向与轧制方向夹角的增加,相应的塑性变形流动应力随之增加;RD-0°与RD-45°试样具有较高的应变硬化能力,而RD-90°试样应变硬化率敏感性较低,试样提前失去承载能力。圆柱试样在压缩变形过程中的塑性变形行为与压缩方向和轧制方向的夹角密切相关:在RD-0°试样压缩过程中,长条状晶粒被反向压缩,塑性变形由滑移主导,同时生成了大量的{11-20}孪晶起到协调变形作用;在RD-45°试样压缩过程中,易沿晶界发生剪切,变形机制以位错滑移为主;在RD-90°试样压缩时,轧制所形成的长条状晶粒被继续拉长,位错滑移或孪生都受到约束,容易形成裂纹。

关键词： TA1纯钛压缩强度应变硬化率变形机制

Hydrodynamic Characteristics of Square Heaving Plates with Opening Under Forced Oscillation

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China Ocean Engineering 2019年第6期33卷 637-648页

作者： CONG long-fei TENG Bin State Key Laboratory of Coastal and Offshore Engineering Dalian University of Technology

The existence of the heaving plates can improve the heaving motion performance of an offshore structure significantly by providing both extra added mass and *** the current research,numerical investigation is carried out on the hydrodynamic characteristics of both isolated square heaving plate and double square heaving plates with opening by an immersed boundary-lattice Boltzmann *** effects on hydrodynamic performance of plates due to Keulegan-Carpenter(KC)number,frequency number,opening ratio,opening distribution and spacing of plates are *** is found that the heaving plates with optimized opening ratio can provide additional damping compared with the plates without *** hydrodynamic characteristics of double plates can be obtained with the increase of plate spacing.

关键词： immersed boundary-lattice Boltzmann method square heaving plate opening shape opening ratio opening distribution plate spacing

Experimental Analysis on Influencing Factors of NO_(x)emission in Gas-Fired Heating and Hot Water Combi-Boilers

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Journal of Thermal Science 2021年第4期30卷 1151-1159页

作者： ZHOU Weiye LIU Wenbo long fei ZHANG Jianhai Urban Gas&Heat Research Institute North China Municipal Engineering Design&Research Institute Co.LtdTianjin 300384China China Quality Supervising and Test Center for Gas Appliances Tianjin 300384China

To study the influencing factors of NO_(x)emission in gas-fired heating and hot water combi-boilers,a boiler with the maximum heat input of 26.0 k W was selected,and influencing factors including flue restrictor diameter,fan power,nozzle aperture,nozzle ejection distance and air relative humidity on NO_(x)formation were *** NO_(x)test rig has been built and the concentration of NO_(x)at the rated heat input and the NO_(x)weight value(NO_(x))_(pond)with different heat input in the dry flue gas have been tested respectively according to the test methods in Chinese national standard GB *** results show that with the increase of the diameter of flue restrictor at exhaust outlet,the NO_(x)concentration at the rated heat input and the NO_(x)weight value(NO_(x))_(pond)with different heat input in the dry flue gas decreased by 26.9%and 5.9%;with the increase of the diameter of flue restrictor at air intake inlet,the NO_(x)and(NO_(x))_(pond)decreased by 36.5%and 16.0%;with the increase of fan power,the NO_(x)and(NO_(x))_(pond)can be decreased by 48.4%and 16.1%;with the increase of ejection distance of nozzle,the NO_(x)and(NO_(x))_(pond)decreased by 7.7%and 6.8%;with the increase of aperture of nozzle,the NO_(x)and(NO_(x))_(pond)increased by 5.2%and 2.3%;with the increase of air relative humidity,the NO_(x)decreased by 16.4%and the(NO_(x))_(pond)basically remains *** analysis of the influence factors of NO_(x)emission can be provided as reference for the optimization design of combi-boilers with low NO_(x)emission.

关键词： gas-fired combi-boilers nitrogen oxides excess air coefficient air relative humidity

Experimental study and characteristic finite element simulation of solute transport in a cross-fracture

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Geoscience Frontiers 2016年第6期7卷 963-967页

作者： long-fei Chen yong Huang Civil Engineering Department of Chongqing Three Gorges College Wanzhou 404000China School of Earth Sciences and Engineering Hohai UniversityNanjing 210098China

A new method, the characteristic finite element method （CFEM）, was developed to simulate solute transport in a cross-fracture. The solution of this mathematical model for solute transport considered that the contribution of convection and dispersion terms was deduced using the single-step, trace-back method and routine finite element method （FEM）. Also, experimental models were designed to verify the reliability and validity of the CFEM. Results showed that experimental data from a single fracture model agreed with numerical simulations obtained from the use of the CFEM. However, routine FEM caused numerical oscillation and dispersion during the calculation of solute concentration. Furthermore, in this cross-fracture model, CFEM simulation results predicted that the arrival time of concentration peak values decreased with increasing flux. Also, the second concentration peak value was obvious with the decrease of flux, which may have resulted from the convergence of solute concentrations from main, and branch, fractures.

关键词： Solute transport Cross-fracture CFEM Dispersion

The construction and approximation of feedforward neural network with hyperbolic tangent function

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Applied Mathematics(A Journal of Chinese Universities) 2015年第2期30卷 151-162页

作者： CHEN Zhi-xiang CAO fei-long Department of Mathematics Shaoxing University Department of Mathematics China Jiliang University

In this paper, we discuss some analytic properties of hyperbolic tangent function and estimate some approximation errors of neural network operators with the hyperbolic tan- gent activation function. Firstly, an equation of partitions of unity for the hyperbolic tangent function is given. Then, two kinds of quasi-interpolation type neural network operators are con- structed to approximate univariate and bivariate functions, respectively. Also, the errors of the approximation are estimated by means of the modulus of continuity of function. Moreover, for approximated functions with high order derivatives, the approximation errors of the constructed operators are estimated.

关键词： Hyperbolic tangent function neural networks approximation modulus of continuity