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“Blocking and rebalance”mechanism-guided design strategies of bimetallic doped 2d a-phosphorus carbide as efficient catalysts for N_(2) electroreduction

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Journal of Energy Chemistry 2024年第10期97卷 68-78,I0003页

作者： Cheng He Jianglong ma Shen Xi Wenxue Zhang State Key Laboratory for Mechanical Behavior of materials School of Materials Science and EngineeringXi'an Jiaotong UniversityXian 710049ShanxiChina School of materials Science and Engineering Chang'an UniversityXi'an 710064ShaanxiChina

Compared to single atom catalysts(SACs),the introduction of dual atom catalysts(dACs)has a significantly positive effect on improving the efficiency in the electrocatalytic nitrogen reduction reaction(NRR)which provides an environmental alternative to the Haber-Bosch ***,the research on the mechanism and strategy of designing bimetallic combinations for better performance is still in its early ***,based on"blocking and rebalance"mechanism,45 combinations of bimetallic pair dopedα-phosphorus carbide(TM_(A)TM_(B)@PC)are investigated as efficient NRR catalysts through density functional theory and machine learning *** a multi-step screening,the combinations of TiV,TiFe,MnMo,and FeW exhibit highly efficient catalytic performance with significantly lower limiting potentials(-0.17,-0.18,-0.14,and-0.30 V,respectively).Excitingly,the limiting potential for CrMo and CrW combinations is 0 V,which are considered to be extremely suitable for the NRR *** mechanism of"blocking and rebalance"is revealed by the exploration of charge transfer for phosphorus atoms in electron blocking ***,the descriptorφis proposed with machine learning,which provides design strategies and accurate prediction for finding efficient *** work not only offers promising catalysts TM_(A)TM_(B)@PC for NRR process but also provides design strategies by presenting the descriptorφ.

关键词： dACs Nitrogen reduction reaction 2d a-phosphorus carbide Inherent attributes machine learning

颈内动脉外翻内膜剥脱术治疗颈动脉狭窄疗效分析

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中国脑血管病杂志 2005年第11期2卷 502-505,509页

作者：张佳栋温向阳 d maza 河南省人民医院神经外科郑州450003 法国冈城大学医学中心心胸血管外科

目的探讨颈内动脉外翻内膜剥脱术治疗颈动脉狭窄的疗效.方法对127例颈动脉粥样硬化性狭窄患者行颈内动脉外翻内膜剥脱术,其中有症状者78例,无症状者49例.术后随访5～16个月,回顾性分析其疗效,评价此术式的优点.结果全组无手术死亡病例.... 详细信息

目的探讨颈内动脉外翻内膜剥脱术治疗颈动脉狭窄的疗效.方法对127例颈动脉粥样硬化性狭窄患者行颈内动脉外翻内膜剥脱术,其中有症状者78例,无症状者49例.术后随访5～16个月,回顾性分析其疗效,评价此术式的优点.结果全组无手术死亡病例.术后患者均复查颈部和脑实质dSA,显示患侧颈动脉形态正常,颈内动脉血管迂曲消失,无1例狭窄.126例患者脑部供血有明显改善,其患侧颈内动脉、皮质下血管显影时间较术前提前0.40～0.90 s,颅内血管血流经过时间缩短0.50～0.80 s;出现脑梗死1例,遗留永久性神经功能缺损,有效率为99.2%,并发症发生率为2.4%.结论颈内动脉外翻内膜剥脱术是一种有效、安全治疗颈动脉粥样硬化性狭窄的手术方式.

关键词：颈动脉狭窄动脉内膜切除术,颈脑缺血

Generalized Laws of Importation and Cross-Migrativity Based on(d, N)-Implications

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Journal of mathematical Research with Applications 2024年第5期44卷 583-595页

作者： Nana ma School of mathematics Xi'an University of Finance and Economics

In the present article we study the generalized laws of importation and crossmigrativity based on(d, N)-implications. On the one hand, we consider the generalized law of importation I(T(x, α), y) = I(x, J(α, y)), when T is concretized as a fuzzy conjunction C, I and J are concretized as(d, N)-implications generated by a fuzzy disjunction d and a fuzzy negation N. On the other hand, we discuss the cross-migrativity of fuzzy disjunctions over fuzzy implications, that is, I(x, d(y, z)) = d(y, I(x, z)), where I is a fuzzy implication, d is a fuzzy disjunction. In addition, we study the relationship between the(α-)cross-migrative of(I, d) and the(α-)cross-law of importation(I, Id,N, C).

关键词： fuzzy implication generalized laws of importation cross-migrativity

Analysis of Tidal Current Energy Potential in the major Channels of the Bohai Strait Based on delft3d

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Journal of Ocean University of China 2024年第4期23卷 859-870页

作者： ma Pengcheng SHI Hongyuan XUE Huaiyuan LI Pingping SUN Yongkang School of Hydraulic Engineering Ludong University of ChinaYantai 264025China Institute of Coastal Research Ludong University of ChinaYantai 264025China Yantai Kekan marine Technology Co. Ltd.Yantai 264025China

The utilization and development of tidal current energy can help alleviate the current energy shortage,improve the global ecological environment,and maintain sustainable *** this study,numerical simulation is carried out on a rectangular grid using *** tidal current energy potential of the major channels in the Bohai Strait is further simulated and estimated by comparing the simulated and measured *** show that the flow module in delft3d has good modeling ability for the assessment of tidal current energy *** average flow velocity,maximum flow velocity,and energy flow density are *** Laotieshan Channel,located in the northern part of the Bohai Strait,shows a large tidal current energy *** maximum flow velocity of this channel can reach 2 m s-1,and the maximum energy flow density can exceed 500 W *** tidal current energy in the Laotieshan Channel is more than 10 times that in other ***,this study advocates for the continued exploration and exploitation of the tidal current energy resources in the Laotieshan Channel.

关键词： delft3d Bohai Strait tidal current energy numerical simulation power density

Weather-driven Solar Power Forecasting Using d-Informer:Enhancing Predictions with Climate Variables

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Energy Engineering 2024年第5期121卷 1245-1261页

作者： Chenglian ma Rui Han Zhao An Tianyu Hu Meizhu Jin School of Electrical Engineering Northeast Electric Power UniversityJilin132013China Shenzhen Institute of Advanced Technology Chinese Academy of SciencesShenzhen518055China

Precise forecasting of solar power is crucial for the development of sustainable energy *** forecasting approaches often fail to adequately consider the crucial role of weather factors in photovoltaic(PV)power generation and encounter issues such as gradient explosion or disappearance when dealing with extensive time-series *** overcome these challenges,this research presents a cutting-edge,multi-stage forecasting method called *** method skillfully merges the differential transformation algorithm with the Informer model,leveraging a detailed array of meteorological variables and historical PV power generation *** d-Informer model exhibits remarkable superiority over competing models across multiple performance metrics,achieving on average a 67.64%reduction in mean squared error(MSE),a 49.58%decrease in mean absolute error(maE),and a 43.43%reduction in root mean square error(RMSE).Moreover,it attained an R2 value as high as 0.9917 during the winter season,highlighting its precision and *** significant advancement can be primarily attributed to the incorporation of a multi-head self-attention mechanism,which greatly enhances the model’s ability to identify complex interactions among diverse input variables,and the inclusion of weather variables,enriching the model’s input data and strengthening its predictive accuracy in time series ***,the experimental results confirm the effectiveness of the proposed approach.

关键词： Power forecasting deep learning weather-driven solar power

Recent Advances in 0d Ni/Co-based Hollow Electrocatalysts for Electrochemical Water Splitting

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Chemical Research in Chinese Universities 2024年第3期40卷 437-450页

作者： GE Wenjing CHEN Xiaocui ma Ruizhao ZHENG Siyuan SHANG Ningzhao ZHAO Xiaoxian department of Chemistry College of ScienceHebei Agricultural UniversityBaoding 071001P.R.China

Electrochemical water splitting using renewable energy sources has been recognized as a sustainable way to produce hydrogen energy due to the characteristics of low-carbon and no ***,the slow hydrogen/oxygen evolution reactions(HER/OER)seriously hinder the practical application of large-scale water *** this paper,the 0d Ni/Co-based hollow material is discussed in detail because of adjustable morphology,low mass density and abundant active sites,which provides an effective solution for improving the HER/OER reaction *** synthesis methods of hollow materials,such as hard template,soft template and self-template are ***,catalysts with different structural designs of hollow structures are reviewed,including hollow single-shelled structure,hollow core-shelled structure,hollow double-shelled structure and hollow multi-shelled structure(HoMS)***,the research progress of the 0d Ni/Co-based HoMS electrocatalysts in recent years and their prominent performances in water splitting are ***,the challenges and development prospects of designing Ni/Co-based HoMS catalysts in water splitting in the future are discussed.

关键词： Electrochemical watersplitting Morphological regulation Hollow structure Hollow multi-shelled structure(HoMS)

Bubble dynamics properties of B-particles in a quasi-2d gas-solid fluidized bed:Computational particle fluid dynamics numerical simulation and post-processed by digital image analysis technique

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Particuology 2024年第3期86卷 223-238页

作者： Zemin Yuan Zhong Huang Guotao Qin Guanjia Zhao Suxia ma Hairui Yang Guangxi Yue Key Laboratory of Clean and Efficient Combustion and Utilization in the Circulating Fluidized Bed Taiyuan University ofTechnologyTaiyuan030024China department of Energy and Power Engineering Tsinghua UniversityBeijing100084.China

Bubble dynamics properties play a crucial and significant role in the design and optimization of gas-solid fluidized *** this study,the bubble dynamics properties of four B-particles were investigated in a quasi-two-dimensional(quasi-2d)fluidized bed,including bubble equivalent diameter,bubble size distribution,average bubble density,bubble aspect ratio,bubble hold-up,bed expansion ratio,bubble radial position,and bubble *** studies were performed by computational particle fluid dynamics(CPFd)numerical simulation and post-processed with digital image analysis(dIA)technique,at superficial gas velocities ranging from 2u_(mf) to 7u_(mf).The simulated results shown that the CPFd simulation combining with dIA technique post-processing could be used as a reliable method for simulating bubble dynamics properties in quasi-2d gas-solid fluidized ***,it seemed not desirable for the simulation of bubble motion near the air distributor at higher superficial gas velocity from the simulated average bubble density *** superficial gas velocity significantly affected the bubble equivalent diameter and evolution,while it had little influence on bubble size distribution and bubble aspect ratio distribution for the same *** time-averaged bubble hold-up and bed expansion ratio increased with the increase of superficial gas *** core-annular flow structures could be found in the fluidized bed for all *** average bubble rising velocity increased with the increasing bubble equivalent *** bubble lateral movement,the smaller bubbles might be more susceptible,and superficial gas velocity had a little influence on the absolute lateral velocity of *** simulated results presented a valuable and novel approach for studying bubble dynamics *** comprehensive understanding of bubble dynamics behaviors in quasi-2d gas-solid fluidized beds would provide support in the design,operation,and optimization of gas-solid

关键词： Bubble dynamics properties CPFd simulation Quasi-2d gas-solid fluidized bed digital image analysis

Regulating the Electron-deficient Component in A-dA1d-A Typed Small-Molecule Acceptors for High-Performance Organic Solar Cells

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Chinese Journal of Chemistry 2024年第6期42卷 623-630页

作者： Weifei Wei Ruijie ma Zhanxiang Chen Tongle Xu Gang Li Zhenghui Luo Shenzhen Key Laboratory of New Information display and Storage materials College of Materials Science and EngineeringShenzhen UniversityShenzhenGuangdong518060 China department of Electronic and Information Engineering Research Institute for Smart Energy (RISE)The Hong Kong Polytechnic UniversityHung HomKowloonHong Kong999077 China

Fine-tuning of the electron-deficient unit in A-dA1d-A typed small-molecule acceptors (Smas) plays a crucial role in developing efficient Smas for organic solar cells (OSCs).Here,we developed a Sma based on benzo[4,5]thieno[2,3-b]quinoxaline,designated as QW1,as well as three Smas based on 1-methylindoline-2,3-dione,identified as QW2,QW3,and *** with QW2,QW1 displays slightly blue-shifted absorption spectra and a lower LUMO energy level due to the stronger electron-withdrawing capability of BTQx in contrast to *** the other hand,the introduction of a bromine atom in QW3 and QW4 causes a blue shift in absorption and a reduction in the LUMO energy level compared to *** functional theory analysis reveals that QW1 exhibits the best molecular planarity,which endows QW1 with larger electron mobility and tighter molecular ***,PM6:QW1 device affords a better efficiency of 15.63% than those of the devices based on QW2 (14.25%),QW3 (13.21%) and QW4 (15.03%).Moreover,the QW4-based device yields the highest open-circuit voltage of 0.933 V,and the PM6:L8-BO:QW4 ternary device realizes a PCE of 19.03%.Overall,our work demonstrates that regulation of electron-deficient central units is an effective strategy to improve the photovoltaic performance of the resulting A-dA1d-A Smas.

关键词： Organic solar cells Small-molecule acceptor Electron-deficient unit Energy conversion efficiency Renewable resources π-πstacking Green chemistry

CToMP: a cycle-task-oriented memory protection scheme for unmanned systems

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Science China(Information Sciences) 2024年第6期67卷 399-417页

作者： Chengyan ma Ning XI di LU Yebo FENG Jianfeng ma School of Cyber Engineering Xidian University School of Computer Science and Technology Xidian University department of Computer and Information Science University of Oregon

Memory corruption attacks(MCAs) refer to malicious behaviors of system intruders that modify the contents of a memory location to disrupt the normal operation of computing systems, causing leakage of sensitive data or perturbations to ongoing processes. Unlike general-purpose systems, unmanned systems cannot deploy complete security protection schemes, due to their limitations in size, cost and *** in unmanned systems are particularly difficult to defend against. Furthermore, MCAs have diverse and unpredictable attack interfaces in unmanned systems, severely impacting digital and physical sectors. In this paper, we first generalize, model and taxonomize MCAs found in unmanned systems currently, laying the foundation for designing a portable and general defense approach. According to different attack mechanisms,we found that MCAs are mainly categorized into two types — return2libc and return2shellcode. To tackle return2libc attacks, we model the erratic operation of unmanned systems with cycles and then propose a cycle-task-oriented memory protection(CToMP) approach to protect control flows from tampering. To defend against return2shellcode attacks, we introduce a secure process stack with a randomized memory address by leveraging the memory pool to prevent Shellcode from being executed. Moreover, we discuss the mechanism by which CTo MP resists the return-oriented programming(ROP) attack, a novel variant of return2libc attacks. Finally, we implement CTo MP on CUAV V5+ with Ardupilot and Crazyflie. The evaluation and security analysis results demonstrate that the proposed approach CTo MP is resilient to various MCAs in unmanned systems with low footprints and system overhead.

关键词： unmanned system memory corruption attack memory protection system security randomized memory address