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Rate-limiting factors in hydrate decomposition through depressurization across various scales:A mini-review

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Chinese Journal of Chemical Engineering 2024年第3期67卷 206-219页

作者： Xian Sun peng Xiao Qinfeng Shi Lingban Wang Zhenbin Xu yuhao Bu Xiaohui Wang Yifei Sun Changyu Sun Guangjin Chen State Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Jining University Jining 273115China

Natural gas hydrate is an energy resource for methane that has a carbon quantity twice more than all traditional fossil fuels combined.However,their practical application in the field has been limited due to the challenges of long-term preparation,high costs and associated risks.Experimental studies,on the other hand,offer a safe and cost-effective means of exploring the mechanisms of hydrate dissociation and optimizing exploitation conditions.Gas hydrate decomposition is a complicated process along with intrinsic kinetics,mass transfer and heat transfer,which are the influencing factors for hydrate decomposition rate.The identification of the rate-limiting factor for hydrate dissociation during depressurization varies with the scale of the reservoir,making it challenging to extrapolate findings from laboratory experiments to the actual exploitation.This review aims to summarize current knowledge of investigations on hydrate decomposition on the subject of the research scale(core scale,middle scale,large scale and field tests)and to analyze determining factors for decomposition rate,considering the various research scales and their associated influencing factors.

关键词： Gas hydrate Rate-limiting factors Research scale Depressurization Decomposition

Improvement strategy on thermophysical properties of A_(2)B_(2)O_(7)-type rare earth zirconates for thermal barrier coatings applications:A review

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International Journal of Minerals,Metallurgy and Materials 2024年第5期31卷 1147-1165页

作者： Zijian peng yuhao Wang Shuqi Wang Junteng Yao Qingyuan Zhao Enyu Xie Guoliang Chen Zhigang Wang Zhanguo Liu Yaming Wang Jiahu Ouyang School of Materials Science and Engineering Harbin Institute of TechnologyHarbin 150001China School of Materials and Metallurgical Engineering Inner Mongolia University of Science&TechnologyBaotou 014010China

The A_(2)B_(2)O_(7)-type rare earth zirconate compounds have been considered as promising candidates for thermal barrier coating(TBC) materials because of their low sintering rate,improved phase stability,and reduced thermal conductivity in contrast with the currently used yttria-partially stabilized zirconia (YSZ) in high operating temperature environments.This review summarizes the recent progress on rare earth zirconates for TBCs that insulate high-temperature gas from hot-section components in gas turbines.Based on the first principles,molecular dynamics,and new data-driven calculation approaches,doping and high-entropy strategies have now been adopted in advanced TBC materials design.In this paper,the solid-state heat transfer mechanism of TBCs is explained from two aspects,including heat conduction over the full operating temperature range and thermal radiation at medium and high temperature.This paper also provides new insights into design considerations of adaptive TBC materials,and the challenges and potential breakthroughs are further highlighted for extreme environmental applications.Strategies for improving thermophysical performance are proposed in two approaches:defect engineering and material compositing.

关键词： rare earth zirconates thermal barrier coatings defect engineering doping and compositing thermal conductivity thermal expansion

Method for the extraction of circulating nucleic acids based on MOF reveals cell-free RNA signatures in liver cancer

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National Science Review 2024年第1期11卷 94-106页

作者： Yuqing Sun Haixin Yu Shaoqing Han Ruoxi Ran Ying Yang Yongling Tang yuhao Wang Wenhao Zhang Heng Tang Boqiao Fu Boshi Fu Xiaocheng Weng Song-Mei Liu Hexiang Deng Shuang peng Xiang Zhou College of Chemistry and Molecular Sciences Key Laboratory of Biomedical Polymers-Ministry of Education Wuhan University Department of Digestive Surgical Oncology Union Hospital Tongji Medical College Huazhong University of Science and Technology Cancer Center Union HospitalTongji Medical CollegeHuazhong University of Science and Technology Department of Clinical Laboratory Center for Gene Diagnosis and Program of Clinical Laboratory Zhongnan Hospital of Wuhan University College of Chemistry and Materials Science Hubei Engineering University Department of Pharmacology School of Pharmacy China Medical University Taikang Center for Life and Medical Sciences Wuhan University Department of Hematology Zhongnan Hospital of Wuhan University

Cell-free RNA(cf RNA) allows assessment of health, status, and phenotype of a variety of human organs and is a potential biomarker to non-invasively diagnose numerous diseases. Nevertheless, there is a lack of highly efficient and bias-free cf RNA isolation technologies due to the low abundance and instability of cf RNA.Here, we developed a reproducible and high-efficiency isolation technology for different types of cell-free nucleic acids(containing cf RNA and viral RNA) in serum/plasma based on the inclusion of nucleic acids by metal-organic framework(MOF) materials, which greatly improved the isolation efficiency and was able to preserve RNA integrity compared with the most widely used research kit method. Importantly, the quality of cf RNA extracted by the MOF method is about 10-fold that of the kit method, and the MOF method isolates more than three times as many different RNA types as the kit method. The whole transcriptome mapping characteristics of cf RNA in serum from patients with liver cancer was described and a cf RNA signature with six cf RNAs was identified to diagnose liver cancer with high diagnostic efficiency(area under curve = 0.905 in the independent validation cohort) using this MOF method. Thus, this new MOF isolation technique will advance the field of liquid biopsy, with the potential to diagnose liver cancer.

关键词： MOF circulating cell-free RNA biomarker liver cancer diagnosis

Sulfur-doped CMK-5 with expanded lattice for high-performance lithium ion batteries

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Chinese Chemical Letters 2023年第7期34卷 279-283页

作者： Zhenjin Liang yuhao peng Xing Zhang Kewei Cao Wei Xiao Dong Gu The Institute for Advanced Studies Wuhan UniversityWuhan 430072China College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China

Heteroatom-doped porous carbon materials are very attractive for lithium ion batteries(LIBs) owing to their high specific surface areas, open pore structures, and abundant active sites. However, heteroatomdoped porous carbon with very high surface area and large pore volume are highly desirable but still remain a big challenge. Herein, we reported a sulfur-doped mesoporous carbon(CMK-5-S) with nanotubes array structure, ultrahigh specific surface area(1390 m^(2)/g), large pore volume(1.8 cm^(3)/g), bimodal pore size distribution(2.9 and 4.6 nm), and high sulfur content(2.5 at%). The CMK-5-S used as an anode material for LIBs displays high specific capacity, excellent rate capability and highly cycling stability. The initial reversible specific capacity at 0.1 A/g is as high as 1580 mAh/g and simultaneously up to 701 mAh/g at 1A/g even after 500 cycles. Further analysis reveals that the excellent electrochemical storage performances is attributed to its unique structures as well as the expanded lattice by sulfur-doping.

关键词： Mesoporous material CMK-5 Hollow structure Sulfur-doping Lithium ion batteries

Modulation of Excitonic Confinement of TiO_(2)in Molten Salts for Overall CO_(2)Photoreduction

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Chinese Journal of Chemistry 2023年第10期41卷 1185-1190页

作者： Jing Wang Ren Sheng Dong Gu yuhao peng Juanxiu Xiao Yijun Shen Wei Xiao College of Chemistry and Molecular Sciences Hubei Key Laboratory of Electrochemical Power SourcesWuhan UniversityWuhan 430072China The Institute for Advanced Studies Wuhan UniversityWuhanHubei 430072China State Key Laboratory of Marine Resource Utilization in South China Sea Hainan UniversityHaikouHainan

Excitonic confinement greatly determines the charge carrier transport of photocatalysts.A molten salt modulation of excitonic con-finement is herein demonstrated as formation of ultrafine carbon-doped anatase TiO_(2)with grafted graphitic carbon nitride,which is rationalized as an excellent catalyst for overall CO_(2)photoreduction.Compared with bulk TiO_(2),the carbon-doped TiO_(2)(M-TiO_(2))pos-sesses a weaker excitonic confinement to decrease exciton binding energy from 99 to 58 meV,consequently enhancing free-charge-carrier generation and transportation.Effective Z-scheme electron transfer from M-TiO_(2)to C_(3)N_(4) is built,enhancing the CO_(2)conversion via the synchronous optimization of redox ability,CO_(2)activation,and^(*)COOH generation.This work highlights the unique chemistry of excitonic dissociation on facilitating separation of electron and hole,and also extends the scope of molten salt-mediated modulation of photocatalysis materials.

关键词： Molten salt CO_(2)reduction Photocatalysis Excitonic confinement Charge transfer

Piezoelectrically Mediated Reactions:From Catalytic Reactions to Organic Transformations

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Chinese Journal of Chemistry 2023年第1期41卷 111-128页

作者： Ziye Ren yuhao peng Hanliang He Chengqiang Ding Jialin Wang Zhao Wang Zhengbiao Zhang State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationSuzhou Key Laboratory of Macromolecular Design and Precision SynthesisCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhouJiangsu 215123China Suzhou Medical College Soochow UniversitySuzhouJiangsu 215123China The Department of Orthopedic Surgery Dushu Lake Hospital Affiliated to Soochow UniversitySuzhouJiangsu 215123China State Key Laboratory of Radiation Medicine and Protection Soochow UniversitySuzhouJiangsu 215123China

Recently,piezocatalysis has attracted considerable attention as a new type of renewable mechanical energy conversion technology,which relies on the strain induced polarization of the piezoelectric material.This new technology has been extensively applied in the applications of water splitting,water remediation,gas purification and tumor therapy.Despite the rapid development in the piezo-catalysis,the utilization of piezoelectric materials for synthetic purpose is still under exploration.Piezoelectric means to promote or-ganic reactions expand the scope of piezoelectrically mediated reactions and show successes in both organic and polymer synthesis.Herein,we provide a comprehensive review on recent progress of piezoelectrically mediated reactions,catalytic mechanisms and applications in the last few years.The limitations and future directions of this area are also discussed.We believe this review will provide new insights into the underlying mechanism of piezoelectric mediated electron transfer process and guide the design of new chemistry.

关键词： Piezocatalysis Heterogeneous catalysis Mechanical energy Polymerization Organic synthesis Water spilling Tumor therapy Mechanoredox Piezoelectric material

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非饱和边坡锚托板支护结构稳定性分析

岩石力学与工程学报 2024年第6期43卷 1443-1454页

作者：彭俊国黄宇豪宋然然章承志兰州理工大学土木工程学院甘肃兰州730050

为了完善锚托板支护边坡的设计方法,根据边坡内部平衡提出锚托板尺寸的计算公式,通过变分法和极限平衡法得到非饱和锚托板支护边坡安全系数的计算公式。利用瞬态渗流模拟降雨工况,得到边坡安全系数随降雨时间的变化规律,并分析边坡安全... 详细信息

为了完善锚托板支护边坡的设计方法,根据边坡内部平衡提出锚托板尺寸的计算公式,通过变分法和极限平衡法得到非饱和锚托板支护边坡安全系数的计算公式。利用瞬态渗流模拟降雨工况,得到边坡安全系数随降雨时间的变化规律,并分析边坡安全系数变化的内部机制。通过4个算例将安全系数的计算结果与现有方法的计算结论进行对比,验证本文方法的合理性。分析降雨强度、地震工况和锚托板支护工况对边坡稳定性和滑移面的影响,结果表明强降雨和地震都会显著降低边坡稳定性,水平和竖直向上的地震力会导致更深的滑动面,而竖直向下的地震力却会导致更浅的滑动面。提出方法不仅可以计算饱和与非饱和边坡安全系数,而且可以计算瞬态渗流、稳态渗流下的边坡安全系数,有较强的适用性。为了便于工程应用,通过对比将锚托板布置在不同竖向间距时的边坡安全系数,给出锚托板竖向3 m间距布置的工程建议。提出锚托板尺寸设计的简便方法,由简便设计方法得到的锚托板尺寸远低于目前的经验设计尺寸。

关键词：边坡工程变分法锚托板瞬态渗流地震作用

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性别差异视角的人力资本理论研究进展

经济学动态 2024年第2期 145-160页

作者：彭新宇邹幸芸傅昱豪长沙理工大学经济与管理学院 410076

人力资本是驱动经济增长的关键因素之一,对劳动力市场结构、收入分配以及社会福利体系有深刻影响,具有重要的经济学研究意义。随着性别经济学领域研究的不断深化与扩展,学者们越来越重视从性别差异视角研究人力资本理论。本文从教育投... 详细信息

人力资本是驱动经济增长的关键因素之一,对劳动力市场结构、收入分配以及社会福利体系有深刻影响,具有重要的经济学研究意义。随着性别经济学领域研究的不断深化与扩展,学者们越来越重视从性别差异视角研究人力资本理论。本文从教育投资、职业选择、公司管理和差异平衡四个方面系统地回顾了性别差异视角的人力资本理论研究进展。首先,从家庭教育和继续教育两个角度探讨了教育投资中的性别差异;其次,将职业性别隔离划分为横向隔离和纵向隔离,并从供给侧和需求侧对职业选择中的性别分化进行了研究;再次,从工资收入、董事会性别多样性与女性进入壁垒三个方面分析了公司管理中的性别差异;最后,从人力资本投资、职场透明度、职场地位和政策干预四个方面梳理了平衡人力资本性别差异的一些措施。本文旨在为国内经济学理论创新贡献见解,并为研究中国特定问题提供学术借鉴。

关键词：人力资本理论性别经济学教育投资职业隔离收入不平等

旱作农田覆膜和秸秆碳投入对土壤团聚特性及作物产量的影响

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土壤学报 2024年第1期61卷 272-284页

作者：王钰皓庞津雯卫婷高飞刘恩科贾志宽张鹏西北农林科技大学农学院陕西杨凌712100 农业农村部西北黄土高原作物生理生态与耕作重点实验室陕西杨凌712100 甘肃省耕地质量建设保护总站兰州730020 中国农业科学院农业环境与可持续发展研究所北京100081

研究秸秆还田形式对旱作覆膜农田土壤团聚特性、有机碳含量及玉米产量的影响,为优化覆膜耕作措施,实现旱作覆膜农田可持续性生产提供理论依据。以长期定位旱作玉米覆膜农田(始于2012年)为研究对象,设置双垄沟覆膜(P)和传统平作(T),分别... 详细信息

研究秸秆还田形式对旱作覆膜农田土壤团聚特性、有机碳含量及玉米产量的影响,为优化覆膜耕作措施,实现旱作覆膜农田可持续性生产提供理论依据。以长期定位旱作玉米覆膜农田(始于2012年)为研究对象,设置双垄沟覆膜(P)和传统平作(T),分别施加秸秆(S)和生物质炭(C),以不还田为对照(N),共形成6个处理:覆膜秸秆还田(PS)、覆膜生物质炭还田(PC)、覆膜不还田(PN)、平作秸秆还田(TS)、平作生物质炭还田(TC)和平作不还田(TN)。测定土壤团聚体组成及团聚体有机碳含量,并分析了双垄沟覆膜和不同秸秆碳投入对土壤有机碳含量、团聚体稳定性及玉米产量的影响。研究结果表明,各秸秆还田处理较不还田处理均可显著(P0.25mm团聚体含量平均显著(P<0.05)提高47.32%,各双垄沟覆膜处理MWD和GMD较平作处理分别平均提高9.19%和4.15%;各还田处理可显著(P<0.05)提高0~60 cm土层土壤有机碳含量,其中PC和TC处理分别较对应PS和TS处理土壤有机碳含量提高2.60%和2.73%;各处理团聚体有机碳含量均随粒径增大而增大,秸秆碳投入可显著(P<0.05)提高各粒级团聚体有机碳含量,而双垄沟覆膜处理则降低了土壤有机碳及团聚体有机碳含量;还田方式、种植方式及土壤有机碳对玉米产量有促进作用,施加秸秆及生物质炭均能显著(P<0.05)提高旱作覆膜农田玉米产量,平均提高14.6%,而秸秆直接还田处理与生物质炭还田处理的增产效果无显著差异。综合分析,在双垄沟覆膜条件下投入秸秆碳能够明显提高土壤稳定性、土壤有机碳含量和作物产量,其中,双垄沟覆膜与生物质炭还田的耦合效应对改善农田土壤质量及地力提升有积极作用。

关键词：双垄沟覆膜土壤团聚特性有机碳玉米产量秸秆碳投入