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基于LSM树的视频数据扩容存储系统设计

电子设计工程 2025年第1期33卷 31-35页

作者：李斌刘思尧国网宁夏电力有限公司信息通信公司宁夏银川750000 宁夏信通网络科技有限公司宁夏银川750000

针对视频清晰度过高导致存储容量不足以及处理耗时长的问题,设计基于LSM树的视频数据扩容存储系统。利用EMCX4-480磁盘阵列储存备份数据,使用FPGA实现数据缓存管理与控制。应用LSM树控制存储过程中出现的延迟问题,并通过分割机制计算数... 详细信息

针对视频清晰度过高导致存储容量不足以及处理耗时长的问题,设计基于LSM树的视频数据扩容存储系统。利用EMCX4-480磁盘阵列储存备份数据,使用FPGA实现数据缓存管理与控制。应用LSM树控制存储过程中出现的延迟问题,并通过分割机制计算数据节点的分割存储数量,由此完成系统扩容。利用LSM树组织视频数据,应用概率描述存储期望值,实现视频数据扩容存储。由实验结果可知,该系统能够将所有视频数据存储在系统中,且数据存储最大耗时为179 ms,能够达到在短时间内实现全部视频数据有效存储的目的。

关键词： LSM树视频数据扩容存储数据重叠系统扩容

Global Solvability for a Predator-Prey Model with Prey-Taxis and Rotational Flux Terms

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Chinese Annals of Mathematics,Series B 2024年第2期45卷 297-318页

作者： Guoqiang REN bin liu School of Mathematics and Statistics Huazhong University of Science and Technology Hubei Key Laboratory of Engineering Modeling and Scientific Computing Huazhong Universityof Science and Technology

In this paper the author investigates the following predator-prey model with prey-taxis and rotational?ux terms■in a bounded domain with smooth *** presents the global existence of generalized solutions to the model... 详细信息

关键词： Predator-prey Prey-taxis Giopal existence Kotational flnux

Rational modulation of fluorophosphate cathode by anionic groups to reduce the polarization behavior for fast-charging sodium-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 509-521页

作者： Xinyuan Wang Fan Zhang Xingyu Zhou Qian Wang Changyu liu Yangyang liu Hui Wang Xiaojie liu Key Laboratory of Synthetic and Natural Functional Molecule of the Ministry of Education College of Chemistry & Materials Science Northwest University

Na3V2（PO4）2O2F （VP） is recognized as a promising cathode material for sodium-ion batteries due to its stable structural framework and high specific *** functional theory （DFT） and finite element simulations show that incorporating SO42-into VP decreases its band gap,lowers the migration energy barrier,and ensures a uniform Na+concentration gradient and stress distribution during charge and discharge ***,the average Na+diffusion coefficient of Na3V2（PO4）1.95（SO4）0.05O2F（VPS-1） is roughly double that of VP,leading to enhanced rate capability (80 C,75.5 mAh g-1) and cycling stability (111.0 mAh g-1capacity after 1000 cycles at 10 C current density) for ***-1 exhibits outstanding fast-charging capabilities,achieving an 80%state of charge in just 8.1 *** assembled VPS-1//SbSn/NPC full cell demonstrated stable cycling over 200 cycles at a high 5 C current,maintaining an average coulombic efficiency of 95.35%.

关键词： Anionic group modulation Polarization behavior Fast-charging Sodium-ion battery Fluorophosphate Cathode

Post-tunable salt gel electrolytes toward flexible supercapacitor switches

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Journal of Energy Chemistry 2025年第1期100卷 114-124页

作者： Hui Wang Shuang Chen Xuming liu Qin Zhang Xin liu Polymeric and Soft Materials Laboratory School of Chemistry and Life Science and Advanced Institute of Materials Science Changchun University of Technology Polymeric and Soft Materials Laboratory School of Chemical Engineering and Advanced Institute of Materials Science Changchun University of Technology

Convertible hydrogel supercapacitors have emerged as promising energy storage devices in switches,diodes, and transistors. However, inherent weaknesses in ionic conductivity, mechanical properties,and water retention of hydrogel electrolytes seriously hinder their development. Inspired by the hardness conversion of sea cucumber skin, a conductivity and mechanics dual-tunable salt gel electrolyte is successfully designed. The salt gel presents a reversible switching of conductors-insulators and a mechanical regulation between softness and hardness via the dissolution-crystallization transition of sodium acetate trihydrate（SAT）. Meanwhile, the salt gels spontaneously grow a layer of “armor” through saturated phase-change salt crystals effectively reducing water evaporation of hydrogel ***, this phase-change soft-rigid conversion strategy will expand the capabilities of gel-based flexible supercapacitors(area capacitance: 258.6 mF cm-2), and the capacitance retention rate could still reach 86.9% after 3000 cycles at high temperatures. Moreover, the salt gel supercapacitor is potentially used in over-heat alarm systems. It is anticipated that the strategy of conductivity and mechanics of dual-tunable salt gel would provide a new perspective on the development of energy storage devices,wearable electronics, and flexible robots.

关键词： Capacitance

Kinematic and mixing characteristics of vortex interaction induced by a vortex generator model:a numerical study

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Applied Mathematics and Mechanics(English Edition) 2021年第3期42卷 387-404页

作者： Ziang WANG bin YU bin ZHANG Miaosheng HE Hong liu School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai 200240China

The underlying effect of vortex interaction characterized by the merging and non-merging on mixing enhancement is of fundamental significance to understand the flow dynamics of strut injectors in *** from a simplified configuration of a vortex generator,this study focuses on the influence of geometric parameters on vortex structures and fluid mixing through compressible Navier-Stokes(NS)*** adjusting the induction of outer vortices,the inner co-rotating vortex pair exhibits two modes of interaction(merging/separation regime)reflected by closer/farther vortex *** by the zero variation rate of the inner vortex spacing,the critical state of equilibrium is *** critical condition is well predicted by a theoretical model based on the Biot-Savart *** the introduction of mixedness and mixing time,the intrinsic impact of interaction modes on fluid mixing is *** with the vortex dynamics in the merging regime,the one in the separation regime is more effective for passive scalar mixing *** efficient material stretching characterized by the higher interface stretching factor and averaging finite-time Lyapunov exponent(FTLE),the mixing time is shortened by as much as 2.5 times in the separation *** implication of the present two interaction regimes in mixing enhancement physically reflected by the averaging FTLE has the potential to improve the combustion performance and shorten the combustor chamber.

关键词： vortex interaction mode fluid mixing Lagrangian coherent structure(LCS) stretching effect

Solubilization of potassium containing minerals by high temperature resistant Streptomyces *** from earthworm's gut

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Acta Geochimica 2016年第3期35卷 262-270页

作者： Dian Feng liu bin Lian bin Wang Jiangsu Key Laboratory for Microbes and Functional Genomics Jiangsu Engineering and Technology Research Center for Microbiology College of Life Sciences Nanjing Normal University No. 1 Wenyuan Road Department of Bioengineering Puyang Vocational & Technical Institute State Key Laboratory of Environmental Geochemistry Institute of Geochemistry Chinese Academy of Sciences Department of Bio-Engineering Henan Institute of Science and Technology

A potassium solubilizing bacterial strain des- ignated EGT, which is tolerant of high temperature, was isolated from an earthworm＇s gut to obtain a bacterium that can weather potassium-bearing rock effectively through solid-state fermentation. Molecular phylogeny and 16S rRNA gene sequence analysis demonstrated the bacterial strain was a member of the Streptomyces genus. To assess its potential to release potassium from silicate minerals, this strain was used to degrade potassium-bearing rock powder by solid-state fermentation. After fermentation, the amount of water-soluble A1, Fe and K of the substrate with active inoculum was higher than those of the control, which had autoclaved inoculum, and those of the fresh substrate. The result indicated that the strain had the ability to weather potassium-bearing rock and could be used as an inoculum in the production of potassium bio-fertilizer, due to its potassium release activity from rock and tolerance to high temperature.

关键词： Weathering Potassium solubilizing bacteria Streptomyces

Synergistically Toughening Effect of SiC Whiskers and Nanoparticles in Al_2O_3-based Composite Ceramic Cutting Tool Material

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Chinese Journal of Mechanical Engineering 2016年第5期29卷 977-982页

作者： liu Xuefei liu Hanlian HUANG Chuanzhen WANG Limei ZOU bin ZHAO bin Centre for Advanced Jet Engineering Technologies School of Mechanical EngineeringShandong University School of Mechanical and Electrical Engineering Qilu Institute of Technolegy Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education Shandong University

In recent decades, many additives with different characteristics have been applied to strengthen and toughen Al2O3-based ceramic cutting tool materials. Among them, SiC whiskers and SiC nanoparticles showed excellent performance in improving the material properties. While no attempts have been made to add SiC whiskers and SiC nanoparticles together into the ceramic matrix and the synergistically toughening effects of them have not been studied. An Al2O3-SiCw-SiC np advanced ceramic cutting tool material is fabricated by adding both one-dimensional SiC whiskers and zero-dimensional SiC nanoparticles into the Al2O3 matrix with an effective dispersing and mixing process. The composites with 25 vol% SiC whiskers and 25 vol% SiC nanoparticles alone are also investegated for comparison purposes. Results show that the Al2O3-SiCw-SiCnp composite with both 20 vo1% SiC whiskers and 5 vol% SiC nanoparticles additives have much improved mechanical properties. The flexural strength of Al2O3-SiCw-SiCnp is 730＋ 95 MPa and fracture toughness is 5.6 ± 0.6 MPa.m1/2. The toughening and strengthening mechanisms of SiC whiskers and nanoparticles are studied when they are added either individually or in combination. It is indicated that when SiC whiskers and nanoparticles are added together, the grains are further refined and homogenized, so that the microstructure and fracture mode ratio is modified. The SiC nanoparticles are found helpful to enhance the toughening effects of the SiC whiskers. The proposed research helps to enrich the types of ceramic cutting tool and is benefit to expand the application range of ceramic cutting tool.

关键词： Al2O3-based ceramic cutting tool materials SiC whiskers SiC nanoparticles mechanical properties,toughening and strengthening mechanisms

Numerical evaluation of tandem rotor for highly loaded transonic fan

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航空动力学报 2011年第6期26卷 1352-1361页

作者： ZHAO bin liu Bao-jie School of Jet Propulsion Beijing University of Aeronautics and Astronautics Beijing 100191 China

Transonic tandem rotor was designed for highly loaded fan at a corrected tip speed of 381 m/s and another conventional rotor was designed as a baseline to evaluate the loading superiority of tandem rotor with three-dimensional(3-D) numerical *** aft blade solidity and its impact on total loading level were studied in *** result indicates that tandem rotor has potential to achieve higher loading level and attain favorable aerodynamic performance in a wide range of loading coefficient 0.55~0.68,comparing with the conventional rotor which produced a total pressure ratio of 2.0 and loading coefficient of 0.42.

关键词： transonic fan tandem rotor highly loaded loading coefficient numerical simulation

Leader-following consensus of second-order nonlinear multi-agent systems subject to disturbances

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Frontiers of Information Technology & Electronic Engineering 2019年第1期20卷 88-94页

作者： Mao-bin LU Lu liu School of Automation Beijing Institute of Technology City University of Hong Kong Shenzhen Research Institute Department of Biomedical Engineering City University of Hong Kong

In this study, we investigate the leader-following consensus problem of a class of heterogeneous secondorder nonlinear multi-agent systems subject to disturbances. In particular, the nonlinear systems contain uncertainties that can be linearly parameterized. We propose a class of novel distributed control laws, which depends on the relative state of the system and thus can be implemented even when no communication among agents exists. By Barbalat's lemma, we demonstrate that consensus of the second-order nonlinear multi-agent system can be achieved by the proposed distributed control law. The effectiveness of the main result is verified by its application to consensus control of a group of Van der Pol oscillators.

关键词： Multi-agent systems Leader-following consensus Distributed control