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Evolution of pore systems in low-maturity oil shales during thermal upgrading--Quantified by dynamic SEM and machine learning

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Petroleum Science 2024年第3期21卷 1739-1750页

作者： jun Liu xue Bai Derek Elsworth Key Laboratory of Deep Underground Science and Engineering(Ministry of Education) Institute of New Energy and Low-Carbon TechnologySichuan UniversityChengdu610065SichuanChina International Quantum Academy Shenzhen518048GuangdongChina Shenzhen Institute of Advanced Electronic Materials Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhen518055GuangdongChina Department of Energy and Mineral Engineering Pennsylvania State University ParkPA 16802USA

In-situ upgrading by heating is feasible for low-maturity shale oil,where the pore space dynamically *** characterize this response for a heated substrate concurrently imaged by *** systematically follow the evolution of pore quantity,size(length,width and cross-sectional area),orientation,shape(aspect ratio,roundness and solidity)and their anisotropy—interpreted by machine *** indicate that heating generates new pores in both organic matter and inorganic ***,the newly formed pores are smaller than the original pores and thus reduce average lengths and widths of the bedding-parallel pore ***,the average pore lengths and widths are increased in the bedding-perpendicular ***,heating increases the cross-sectional area of pores in low-maturity oil shales,where this growth tendency fluctuates at300℃.In addition,the orientation and shape of the newly-formed heating-induced pores follow the habit of the original pores and follow the initial probability distributions of pore orientation and ***,limited anisotropy is detected in pore direction and shape,indicating similar modes of evolution both bedding-parallel and *** propose a straightforward but robust model to describe evolution of pore system in low-maturity oil shales during heating.

关键词： Low-maturity oil shale Pore elongation Organic matter pyrolysis In-situthermal upgrading Scanning electron microscopy(SEM) Machine learning

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Quaternary quasi-cyclic codes

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Applied Mathematics(A Journal of Chinese Universities) 2008年第3期23卷 359-365页

作者： PEI jun-ying ZHANG xue-jun Dept. of Math. Soochow Univ. Suzhou 215006 China

Quasi-cyclic codes of length mn over Z4 are shown to be equivalent to A-submodules of A^n, where A = Z4[x]/（x^m - 1）. In the case of m being odd, all quasi-cyclic codes are shown to be decomposable into the direct sum of a fixed number of cyclic irreducible A-submodules. Finally the distinct quasi-cyclic codes as well as some specific subclasses are enumerated.

关键词： quasi-cyclic code primary component type

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An open-label, multicenter, randomized, crossover study comparing sildenafil citrate and tadalahl for treating erectile dysfunction in Chinese men na＇=＇ve to phosphodiesterase 5 .inhibitor therapy

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Asian Journal of Andrology 2015年第1期17卷 61-67,I0007,I0008页

作者： Wen-jun Bai Hong-jun Li Yu-Tian Dai xue-You He Yi-Ran Huang ji-Hong Liu Sebastian Sorsaburu Chen ji jian-jun jin Xiao-Feng Wang Department of Urology People's Hospital of Peking University Beijing China Department of Urology Peking Union Medical College Hospital Beijing China Department of Andrology Nanjing Drum Tower Hospital Jiangsu China Department of Urology Chinese PLA General Hospital Beijing China Department of Urology Shanghai Renji Hospital Shanghai China Department of Urology Tongji Hospital Tengji Medical College of Huazhong University of Science and Technology Wuhan China Department of Medical Eli Lilly and Company Indianapolis IN USA Department of Medical Lilly Suzhou Pharmaceutical Co. Ltd. Shanghai China.

The study was to compare treatment preference, efficacy, and tolerability of sildenafil citrate （sildenafil） and tadalafil for treating erectile dysfunction （ED） in Chinese men na＇ive to phosphodiesterase 5 （PDE5） inhibitor therapies. This multicenter, randomized, open-label, crossover study evaluated whether Chinese men with ED preferred 20-mg tadalafil or 100-mg sildenafil. After a 4 weeks baseline assessment, 383 eligible patients were randomized to sequential 20-mg tadalafil per 100-mg sildenafil or vice versa for 8 weeks respectively and then chose which treatment they preferred to take during the 8 weeks extension. Primary efficacy was measured by Question 1 of the PDE5 Inhibitor Treatment Preference Questionnaire （PITPQ）. Secondary efficacy was analyzed by PITPQ Question 2, the International Index of Erectile Function （IIEF） erectile function （EF） domain, sexual encounter profile （SEP） Questions 2 and 3, and the Drug Attributes Questionnaire. Three hundred and fifty men （91%） completed the randomized treatment phase. Two hundred and forty-two per 350 （69.1%） patients preferred 20-mg tadalafil, and 108/350 （30.9%） preferred lO0-mg sildenafil （P 〈 0.001） as their treatment in the 8 weeks extension. Ninety-two per 242 （38%） patients strongly preferred tadalafil and 37/108 （34.3%） strongly the preferred sildenafil. The SEP2 （penetration）, SEP3 （successful intercourse）, and IIEF-EF domain scores were improved in both tadalafil and sildenafil treatment groups. For patients who preferred tadalafil, getting an erection long after taking the medication was the most reported reason for tadalafil preference. The only treatment-emergent adverse event reported by 〉 2% of men was headache. After tadalafil and sildenafil treatments, more Chinese men with ED na＇ive to PDE5 inhibitor preferred tadalafil. Both sildenafil and tadalafil treatments were effective and safe.

关键词： erectile dysfunction patient preference phosphodiesterase 5 inhibitors

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Altering elastic-plastic mechanical response of a series of isostructural metal-organic complex crystals

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Science China Chemistry 2022年第4期65卷 710-718页

作者： Zheng Tang Xiao-Peng Sun Shu-Dong Wang xue-Yang ji Yun Li Zi-Shuo Yao jun Tao Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringBeijing Institute of TechnologyBeijing 100081China Henan Key Laboratory of Polyoxometalate Chemistry College of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China

The mechanically compliant single crystals have attracted massive ***,the related reports on the single crystals composed of metal-organic complexes remain *** this study,we synthesized a series of isostructural single crystals of Zn^(Ⅱ) complexes that manifest mechanical bending in response to external *** these crystals,the mechanical responses can be shifted between elastic bending and plastic bending by the control of the intermolecular interactions through a rational structural modification in the substituent group of pyridine *** the molecular reorientation corresponding to ligand variation elongates the interfacial distance between molecular slip planes,and the structural disorder of ligands disperses the interplanar intermolecular interactions,the shift from elastic bending to plastic bending of the metal-organic complex-based single crystal was *** different mechanical responses of single crystals were comprehensively investigated both experimentally and theoretically.

关键词： mechanical property flexible crystals crystal engineering metal-organic complex intermolecular interaction

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Identification of Dynamic Active Sites Among Cu Species Derived from MOFs@CuPc for Electrocatalytic Nitrate Reduction Reaction to Ammonia

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Nano-Micro Letters 2023年第8期15卷 20-34页

作者： xue‑Yang ji Ke Sun Zhi‑Kun Liu Xinghui Liu Weikang Dong Xintao Zuo Ruiwen Shao jun Tao Key Laboratory of Cluster Science of Ministry of Education School of Chemistry and Chemical EngineeringLiangxiang CampusBeijing Institute of TechnologyBeijing 102488People’s Republic of China Department of Chemistry Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Materials Physics Saveetha School of EngineeringSaveetha Institute of Medical and Technical Sciences(SIMTS)ThandalamChennaiTamilnadu 602105India Beijing Advanced Innovation Center for Intelligent Robots and Systems and Institute of Engineering Medicine Beijing Institute of TechnologyBeijing 100081People’s Republic of China Key Laboratory of Bio‑inspired Smart Interfacial Science and Technology of Ministry of Education School of ChemistryBeihang UniversityBeijing 100191People’s Republic of China

Direct electrochemical nitrate reduction reaction(NITRR)is a promising strategy to alleviate the unbalanced nitrogen cycle while achieving the electrosynthesis of ***,the restructuration of the high-activity Cu-based electrocatalysts in the NITRR process has hindered the identification of dynamical active sites and in-depth investigation of the catalytic ***,Cu species(single-atom,clusters,and nanoparticles)with tunable loading supported on N-doped TiO_(2)/C are successfully manufactured with MOFs@CuPc precursors via the pre-anchor and post-pyrolysis *** behavior among Cu species is co-dependent on the Cu loading and reaction potential,as evidenced by the advanced operando X-ray absorption spectroscopy,and there exists an incompletely reversible transformation of the restructured structure to the initial ***,restructured CuN_(4)&Cu_(4) deliver the high NH_(3) yield of 88.2 mmol h^(−1)g_(cata)^(−1) and FE(~94.3%)at−0.75 V,resulting from the optimal adsorption of NO_(3)^(−) as well as the rapid conversion of^(*)NH_(2)OH to^(*)NH_(2) intermediates originated from the modulation of charge distribution and d-band center for Cu *** work not only uncovers CuN_(4)&Cu_(4) have the promising NITRR but also identifies the dynamic Cu species active sites that play a critical role in the efficient electrocatalytic reduction in nitrate to ammonia.

关键词： Metal-organic frameworks Copper phthalocyanine Electrocatalytic nitrate reduction reaction

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Effects of Steel Teeming in New Slide Gate System with Electromagnetic Induction

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Journal of Iron and Steel Research International 2015年第1期22卷 30-35页

作者： Qiang WANG De-jun LI Xing-an LIU xue-bin WANG jie DONG ji-cheng HE Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University Technology Center Angang Steel Co.Ltd. Technology Center Shandong Laiwu Iron and Steel Group

Steel teeming time is a very important parameter in the new slide gate system with electromagnetic induction （called electromagnetic steel teeming system）, and how to shorten this time is a key to realize application of the new system in continuous casting. The effects of power parameters, coil position, nozzle material and other factors on the steel teeming time were investigated by a self-designed electromagnetic steel teeming system in detail. The experimental results show that the relationship between power and steel teeming time is nonlinear. The coil position has great in- fluence on steel teeming time. And the upper nozzle with high permeability can reduce the teeming time. In addition, the steel teeming time becomes minimum when the size of the spherical cast iron particles is 2.0 ram. This research can provide technical references for the industrial application of the new electromagnetic steel teeming system.

关键词： continuous casting clean steel automatic pouring electromagnetic metallurgy steel teeming

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High-temperature oxidation behavior of 9Cr‒5Si‒3Al ferritic heat-resistant steel

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International Journal of Minerals,Metallurgy and Materials 2020年第9期27卷 1244-1250页

作者： jun-jun Yan xue-fei Huang Wei-gang Huang College of Materials Science and Engineering Sichuan UniversityChengdu 610065China

To improve the oxidation properties of ferritic heat-resistant steels,an Al-bearing 9Cr‒5Si‒3Al ferritic heat-resistant steel was *** then conducted cyclic oxidation tests to investigate the high-temperature oxidation behavior of 9Cr‒5Si and 9Cr‒5Si‒3Al ferritic heat-resistant steels at 900 and 1000℃.The characteristics of the oxide layer were analyzed by X-ray diffraction,scanning electron microscopy,and energy dispersive *** results show that the oxidation kinetics curves of the two tested steels follow the parabolic law,with the parabolic rate constant kp of 9Cr‒5Si‒3Al steel being much lower than that of 9Cr‒5Si steel at both 900 and 1000℃.The oxide film on the surface of the 9Cr‒5Si alloy exhibits Cr2MnO4 and Cr2O3 phases in the outer layer after oxidation at 900 and 1000℃.However,at oxidation temperatures of 900 and 1000℃,the oxide film of the 9Cr‒5Si‒3Al alloy consists only of Al2O3 and its oxide layer is thinner than that of the 9Cr‒5Si *** results indicate that the addition of Al to the 9Cr‒5Si steel can improve its high-temperature oxidation resistance,which can be attributed to the formation of a continuous and compact Al2O3 film on the surface of the steel.

关键词： ferritic heat-resistant steel high-temperature oxidation oxidation kinetics aluminum

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A method to Estimate Dynamic Responses of VLFS Based on Multi-Floating-Module Model Connected by Elastic Hinges

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China Ocean Engineering 2021年第5期35卷 687-699页

作者： HUANG Heng CHEN Xu-jun LIU jun-yi MIAO Yu-ji ji Song College of Field Engineering Army Engineering University of PLANanjing 210007China China Ship Scientific Research Center Wuxi 214082China

Based on the elastic foundation beam theory and the multi-floating-module hydrodynamic theory,a novel method is proposed to estimate the dynamic responses of VLFS(Very Large Floating Structure).In still water,a VLFS can be simplified as an elastic foundation beam model or a multi-floating-module model connected by elastic *** to equivalent displacement of the two models in static analysis,the problem of rotation stiffness of elastic hinges can be ***,based on the potential flow theory,the dynamic responding analysis of multi-floatingmodule model under wave loads can be computed in ANSYS-AQWA *** assembling the time domain analysis results of each module,the dynamic responses of the VLFS can be *** of the method is conducted through a series of comparison calculations,which mainly includes a continuous structure and a three-part structure connected by hinges in regular *** results of this paper method show a satisfactory agreement with the experiment and calculation data given in relative references.

关键词： Very Large Floating Structure(VLFS) dynamic responses elastic foundation beam multi-floatingmodule model elastic hinge

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高密度栽培对烟草青枯病抗性鉴定及株型性状的影响

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中国烟草学报 2011年第1期17卷 77-82页

作者：孙学永祖朝龙高正良季学军周应兵杨华应竟丽丽李廷春安徽省农业科学院烟草研究所合肥市农科南路40号230031 安徽省皖南烟叶有限责任公司安徽省宣城市昭亭北路2号242000

采用密度及品种双因素裂区设计,分析不同栽培密度对烟草青枯病抗性鉴定及株型的影响。结果表明:不同栽培密度及品种间烟草青枯病发病率及病情指数差异显著,密度与品种互作不显著;不同年份、不同时期的病情、病率与栽培密度呈线性负相关... 详细信息

采用密度及品种双因素裂区设计,分析不同栽培密度对烟草青枯病抗性鉴定及株型的影响。结果表明:不同栽培密度及品种间烟草青枯病发病率及病情指数差异显著,密度与品种互作不显著;不同年份、不同时期的病情、病率与栽培密度呈线性负相关关系,其方程决定系数R2大于0.8;株型性状中,株高、叶数与栽培密度呈线性正相关关系,决定系数R2小于0.5,腰叶长、腰叶宽、茎围与栽培密度呈线性负相关关系,决定系数R2大于0.7;不同调查期间的发病指数呈对数关系,决定系数R2大于0.7。综上认为高密度栽培能用于烟草抗性鉴定及育种。

关键词：烟草青枯病抗性鉴定与育种密度株型性状

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Depositional Environment and Origin of Inertinite-rich Coal in the Ordos Basin

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Acta Geologica Sinica(English Edition) 2024年第4期98卷 1064-1085页

作者： SHI Qingmin ZHAO jun ji Ruijun xue Weifeng HAN Bo CAI Yue LI Chunhao CUI Shidong College of Geology and Environment Xi’an University of Science and TechnologyXi’an 710054China Shaanxi Coal Chemical Industry Technology Research Institute Co. Ltd.Xi’an 710199China China National Logging Corporation Geological Research InstituteXi’an 710077China

Inertinite-rich coal is widely distributed in the Ordos Basin,represented by the No.2 coal seam of the Middle Jurassic Yan'an *** paper combined coal petrology and geochemistry to analyze the origin of inertinite,changes in the coal-forming environment and control characteristics of *** has shown that there are two forms of inertinite sources in the study *** typical fusinization,wildfire events also play a substantial role in inertinite *** are significant fluctuations in the coal-forming environment of samples at different *** samples were formed in dry forest swamp with low water levels and strong oxidation,which have a high inertinite content,and the samples formed in wet forest swamp and limnic showed low inertinite ***,the inertinite content of different origins does not fully correspond to the depositional environment characterized by dryness and *** inertinites were significantly influenced by climatic conditions,while pyrofusinite was not entirely controlled by climatic conditions but rather directly impacted by wildfire *** high oxygen level was the main factor causing widespread wildfire ***,the combination of wildfire activity and oxidation generates a high content of inertinite in the Middle Jurassic coal of the Ordos Basin.

关键词： inertinite-rich coal wildfire coal petrology geochemistry biomarkers depositional environment

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