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湖、库水体CH_(4)冒泡排放研究进展

湖泊科学 2024年第2期36卷 339-352页

作者：康满春刘流刘佳肖尚斌三峡大学三峡库区生态环境教育部工程研究中心宜昌443002 三峡水库生态系统湖北省野外科学观测研究站宜昌443002 云南师范大学高原地理过程与环境变化云南省重点实验室昆明650500

冒泡排放是湖、库水体CH_(4)排放的主要方式之一,其排放通量和占CH_(4)总排放量比例均具有极其显著的时空差异性,是当前水体CH_(4)排放估算不确定性的主要来源之一。然而,目前关于湖、库水体CH_(4)冒泡排放通量监测、时空分布规律、过... 详细信息

冒泡排放是湖、库水体CH_(4)排放的主要方式之一,其排放通量和占CH_(4)总排放量比例均具有极其显著的时空差异性,是当前水体CH_(4)排放估算不确定性的主要来源之一。然而,目前关于湖、库水体CH_(4)冒泡排放通量监测、时空分布规律、过程机制和模型模拟的系统梳理鲜有报道。本研究对比了目前水体CH_(4)冒泡的监测方法技术的适用性及优缺点,分析总结湖、库水体CH_(4)冒泡排放及通量的时空分布特征,梳理CH_(4)气泡在沉积物-水体中的产生-成长-迁移-释放的过程、影响因素及模型,并提出了水体CH_(4)冒泡过程模型框架。最后,本研究提出未来研究应基于湖、库水体分类、设备开发和改进来构建适应性的湖、库水体CH_(4)冒泡排放监测标准体系,开发基于过程的CH_(4)冒泡机理模型,为认识变化环境下湖、库水体CH_(4)冒泡过程和准确估算CH_(4)排放量提供支撑。

关键词：甲烷冒泡排放湖泊水库气泡模型

Optimal Operation Strategy of Electricity-Hydrogen Regional Energy System under Carbon-Electricity Market Trading

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Energy Engineering 2024年第3期121卷 619-641页

作者： Jingyu Li Mushui Wang Zhaoyuan Wu Guizhen Tian Na zhang Guangchen liu Inner Mongolia Key Laboratory of Electrical Energy Conversion Transmission and Control Inner Mongolia University of TechnologyHohhot010080China School of Electric Power Inner Mongolia University of TechnologyHohhot010080China School of Electrical and Electronic Engineering North China Electric Power UniversityBeijing102206China

Given the“double carbon”objective and the drive toward low-carbon power,investigating the integration and interaction within the carbon-electricity market can enhance renewable energy utilization and facilitate energy conservation and emission reduction ***,further research is necessary to explore operational optimization methods for establishing a regional energy system using Power-to-Hydrogen(P2H)technology,focusing on participating in combined carbon-electricity market *** study introduces an innovative Electro-Hydrogen Regional Energy System(EHRES)in this *** system integrates renewable energy sources,a P2H system,cogeneration units,and energy storage *** core purpose of this integration is to optimize renewable energy utilization and minimize carbon *** study aims to formulate an optimal operational strategy for EHRES,enabling its dynamic engagement in carbon-electricity market *** initial phase entails establishing the technological framework of the electricity-hydrogen coupling system integrated with ***,an analysis is conducted to examine the operational mode of EHRES as it participates in carbon-electricity market ***,the system scheduling model includes a stepped carbon trading price mechanism,considering the combined heat and power generation characteristics of the Hydrogen Fuel Cell(HFC).This facilitates the establishment of an optimal operational model for EHRES,aiming to minimize the overall operating *** simulation example illustrates that the coordinated operation of EHRES in carbon-electricity market transactions holds the potential to improve renewable energy utilization and reduce the overall system *** result carries significant implications for attaining advantages in both low-carbon and economic aspects.

关键词： Regional energy system electro-hydrogen coupling carbon-electricity market step carbon trading coordination and optimization

Microstructure refinement and work hardening in a machined surface layer induced by turning Inconel 718 super alloy

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International Journal of Minerals,Metallurgy and Materials 2018年第8期25卷 937-949页

作者： Xiao-ping Ren zhan-qiang liu School of Mechanical Engineering Shandong University Key Laboratory of High Efficiency and Clean Mechanical Manufacture Ministry of EducationShandong University

The microstructural changes in the machined surface layer of Ni-based super alloys essentially determine the final performance of the structural components of aerospace engines in which these alloys are *** this work,multiscale metallurgical observations using scanning electron microscopy,electron-backscatter diffraction microscopy,and transmission electron microscopy were conducted to quantitatively characterize the microstructure of the machined ***,to elucidate the factors that affect the formation of the refinement microstructure,the distributions of the deformation parameters(strain,strain rate,and temperature) in the machined subsurface were analyzed.A dislocation–twin interaction dynamic recrystallization mechanism for grain refinement during machining of Inconel 718 is ***,microhardness evolution induced by grain refinement in the machined surface is *** results suggest that the gradient microstructure and the work hardening can be optimized by controlling the cutting parameters during turning of Inconel 718.

关键词： grain refinement dislocation–twin interaction work hardening turning Inconel 718

The effects of exercise interventions on brain-derived neurotrophic factor levels in children and adolescents:a meta-analysis

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Neural Regeneration Research 2025年第5期20卷 1513-1520页

作者： Xueyun Shao Longfei He Yangyang liu Physical Education School Shenzhen UniversityShenzhenGuangdong ProvinceChina Shenzhen Institute of Neuroscience ShenzhenGuangdong ProvinceChina

Brain-derived neurotrophic factor is a crucial neurotrophic factor that plays a significant role in brain health. Although the vast majority of meta-analyses have confirmed that exercise interventions can increase brain-derived neurotrophic factor levels in children and adolescents, the effects of specific types of exercise on brain-derived neurotrophic factor levels are still controversial. To address this issue, we used meta-analytic methods to quantitatively evaluate, analyze, and integrate relevant studies. Our goals were to formulate general conclusions regarding the use of exercise interventions, explore the physiological mechanisms by which exercise improves brain health and cognitive ability in children and adolescents, and provide a reliable foundation for follow-up research. We used the Pub Med, Web of Science, Science Direct, Springer, Wiley Online Library, Weipu, Wanfang, and China National Knowledge Infrastructure databases to search for randomized controlled trials examining the influences of exercise interventions on brain-derived neurotrophic factor levels in children and adolescents. The extracted data were analyzed using Review Manager 5.3. According to the inclusion criteria, we assessed randomized controlled trials in which the samples were mainly children and adolescents, and the outcome indicators were measured before and after the intervention. We excluded animal experiments, studies that lacked a control group, and those that did not report quantitative results. The mean difference(MD;before versus after intervention) was used to evaluate the effect of exercise on brain-derived neurotrophic factor levels in children and adolescents. Overall, 531 participants(60 children and 471 adolescents, 10.9–16.1 years) were included from 13 randomized controlled trials. Heterogeneity was evaluated using the Q statistic and I^(2) test provided by Review Manager software. The meta-analysis showed that there was no heterogeneity among the studies(P = 0.67,

关键词： adolescents brain-derived neurotrophic factor children exercise meta-analysis randomized controlled trials

Euler’s First-Order Explicit Method–Peridynamic Differential Operator for Solving Population Balance Equations of the Crystallization Process

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Computer Modeling in Engineering & Sciences 2024年第3期138卷 3033-3049页

作者： Chunlei Ruan Cengceng Dong Kunfeng Liang Zhijun liu Xinru Bao Mathematics&Statistics School Henan University of Science&TechnologyLuoyang471023China Longmen Laboratory Luoyang471023China College of Vehicle and Traffic Engineering Henan University of Science&TechnologyLuoyang471023China

Using Euler’s first-order explicit(EE)method and the peridynamic differential operator(PDDO)to discretize the time and internal crystal-size derivatives,respectively,the Euler’s first-order explicit method–peridynamic differential operator(EE–PDDO)was obtained for solving the one-dimensional population balance equation in *** different conditions during crystallization were studied:size-independent growth,sizedependent growth in a batch process,nucleation and size-independent growth,and nucleation and size-dependent growth in a continuous *** high accuracy of the EE–PDDO method was confirmed by comparing it with the numerical results obtained using the second-order upwind and HR-van *** method is characterized by non-oscillation and high accuracy,especially in the discontinuous and sharp crystal size *** stability of the EE–PDDO method,choice of weight function in the PDDO method,and optimal time step are also discussed.

关键词： Population balance equation crystallization peridynamic differential operator Euler’s first-order explicit method

Cooperative engineering the multiple radio-frequency fields to reduce the X-junction barrier for ion trap chips

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Chip 2024年第1期3卷 55-63页

作者： Yarui liu Zhao Wang Zixuan Xiang Qikun Wang Tianyang Hu Xu Wang College of Big Data and Information Engineering Guizhou UniversityGuiyang 550025China Shenzhen Institute for Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China International Quantum Academy Shenzhen 518048China Guangdong Provincial Key Laboratory of Quantum Science and Engineering Southern University of Science and TechnologyShenzhen 518055China

With the increasing number of ion qubits and improving performance of sophisticated quantum algorithms,more and more scalable complex ion trap electrodes have been developed and *** ion shuttling operations at the junction are more frequently used,such as in the areas of separation,merging,and *** studies have been conducted to optimize the geometries of the radio-frequency(RF)electrodes to generate ideal trapping electric fields with a lower junction barrier and an even ion height of the RF saddle ***,this iteration is time-consuming and commonly accompanied by complicated and sharp electrode ***,high-accuracy fabrication process and high electric breakdown voltage are *** the current work,an effective method was proposed to reduce the junction’s pseudo-potential barrier and ion height variation by setting several individual RF electrodes and adjusting each RF voltage amplitude without changing the geometry of the electrode *** simulation results show that this method shows the same effect on engineering the trapping potential and reducing the potential barrier,but requires fewer parameters and optimization *** combining this method with the geometrical shapeoptimizing,the pseudo-potential barrier and the ion height variation near the junction can be further *** addition,the geometry of the electrodes can be simplified to relax the fabrication precision and keep the ability to engineer the trapping electric field in real-time even after the fabrication of the electrodes,which provides a potential all-electric degree of freedom for the design and control of the two-dimensional ion crystals and investigation of their phase transition.

关键词： Ion trap Junction Ion shuttling Electrode optimization Pseudo-potential barrier

Multi-Branch Fault Line Location Method Based on Time Difference Matrix Fitting

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Energy Engineering 2024年第1期121卷 77-94页

作者： Hua Leng Silin He Jian Qiu Feng liu Xinfei Huang Jiran Zhu School of Electrical and Information Engineering Hunan UniversityChangsha410082China Distribution Network Technical Center State Grid Hunan Electric Power Research InstituteChangsha410007China Technical Center China Energy Construction Group Hunan Thermal Power ConstructionZhuzhou412011China School of Electrical and Information Engineering Changsha University of Science and TechnologyChangsha410076China

The distribution network exhibits complex structural characteristics,which makes fault localization a challenging *** when a branch of the multi-branch distribution network fails,the traditional multi-branch fault location algorithm makes it difficult to meet the demands of high-precision fault localization in the multi-branch distribution network *** this paper,the multi-branch mainline is decomposed into single branch lines,transforming the complex multi-branch fault location problem into a double-ended fault location *** on the different transmission characteristics of the fault-traveling wave in fault lines and non-fault lines,the endpoint reference time difference matrix S and the fault time difference matrix G were *** time variation rule of the fault-traveling wave arriving at each endpoint before and after a fault was comprehensively *** realize the fault segment location,the least square method was *** was used to find the first-order fitting relation that satisfies the matching relationship between the corresponding row vector and the first-order function in the two matrices,to realize the fault segment ***,the time difference matrix is used to determine the traveling wave velocity,which,combined with the double-ended traveling wave location,enables accurate fault location.

关键词： Multi-branch lines distribution network fault location double-ended traveling wave positioning least square method

An interpretable model for large-scale smart contract vulnerability detection

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Blockchain(Research and Applications) 2024年第3期5卷 130-139页

作者： Xia Feng Haiyang liu Liangmin Wang Huijuan Zhu Victor S.Sheng City University of Macao Macao 999078China Jiangsu University Zhenjiang 212013China Southeast University Nanjing 211189China Texas Tech University Lubbock 79409USA

Smart contracts hold billions of dollars in digital currency,and their security vulnerabilities have drawn a lot of attention in recent *** methods for detecting smart contract vulnerabilities rely primarily on symbol execution,which makes them time-consuming with high false positive ***,deep learning approaches have alleviated these issues but still face several major limitations,such as lack of interpretability and susceptibility to evasion *** this paper,we propose a feature selection method for uplifting *** fundamental concept of this method is a feature selection algorithm,utilizing interpretation outcomes to select critical features,thereby reducing the scales of *** learning process could be accelerated significantly because of the reduction of the feature *** experiment shows that our proposed model performs well in six types of vulnerability *** accuracy of each type is higher than 93%and the average detection time of each smart contract is less than 1 ***,through our proposed feature selection algorithm,the training time of each type of vulnerability is reduced by nearly 80%compared with that of its original.

关键词： Blockchain Vulnerability detection Smart contract

Multiporphyrinic architectures:Advances in structural design for photodynamic therapy

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Aggregate 2024年第1期5卷 67-84页

作者： Yuwei Gao Yan Li Zhengwei Xu Shuangjiang Yu Junqiu liu Hongcheng Sun College of Material Chemistry and Chemical EngineeringKey Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of EducationHangzhou Normal UniversityHangzhouChina

Rationally designed multiporphyrinic architectures for boosting photodynamic therapy(PDT)have attracted significant attentions recently years due to their great potential for light-mediated generation of reactive oxygen ***,there is still a gap between the structure design and their PDT performance for biomedical *** tutorial review provides a historical overview on(i)the basic concept of PDT for deeply understanding the porphyrin-mediated PDT reactions,(ii)developing strategies for constructing porphyrinic architectures,like nanorings,boxes,metal-organic frameworks(MOFs),covalent-organic frameworks(COFs),vesicles,etc.,where we classified into the following three categories:multiporphyrin arrays,porphyrinic frameworks,and others porphyrin assemblies,(iii)the various application scenarios for clinical cancer therapy and antibacterial ***,the existing challenges and future perspectives on the innovation of porphyrinic architectures for clinical PDT applications are mentioned in the end ***,the porphyrinic nanomaterials with atomically precise architectures provide an ideal platform for investigating the relationship between structures and PDT outputs,design of personalized“all-in-one”theranostic agents,and the popularization and application in wider biomedical fields.

关键词： covalent-organic frameworks(COFs) metal-organic frameworks(MOFs) multiporphyrin arrays photodynamic therapy(PDT) porphyrinic architectures