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可得然胶对冻融循环处理冷冻熟面质构特性的影响

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河南工业大学学报（自然科学版） 2021年第6期42卷 33-38页

作者：曲卓婷梁赢刘玫刘智磊李洁张霞王金水河南工业大学生物工程学院河南郑州450001 河南工业大学粮油食品学院河南郑州450001

利用质构仪研究了可得然胶对冷冻熟面在冻融循环过程中质构特性(硬度、表面黏性、拉伸特性、咀嚼特性(咀嚼度、坚实度和内部黏度))的影响。结果表明:随着冻融循环处理次数的增多,冷冻熟面的硬度、拉伸特性、咀嚼度和坚实度呈现出下降趋... 详细信息

利用质构仪研究了可得然胶对冷冻熟面在冻融循环过程中质构特性(硬度、表面黏性、拉伸特性、咀嚼特性(咀嚼度、坚实度和内部黏度))的影响。结果表明:随着冻融循环处理次数的增多,冷冻熟面的硬度、拉伸特性、咀嚼度和坚实度呈现出下降趋势,而黏度(表面黏度和内部黏度)呈现出上升趋势;可得然胶对冷冻熟面在冻融循环过程中质构特性的下降有明显抑制作用;当添加0.5%可得然胶,经历了10次冻融循环后的冷冻熟面的拉伸特性增强到最大限度,其最大拉伸强度、最大断裂距离分别从10.54 g、23.77 mm上升到20.13 g、40.20 mm;咀嚼度增长到最大值,从52.40 g·s上升到84.76 g·s;表面黏度、内部黏度均下降到最低值,分别从90.07 g·s、0.20 g·s下降到70.82 g·s、0.13 g·s;经过10次冻融循环处理后,冷冻熟面的硬度、坚实度在添加0.9%可得然胶后达到最大值,分别为1 247.78 g、25.95 g。研究结果为提升冷冻熟面及速冻食品的最终品质提供了新的思路,开拓了可得然胶在速冻食品中的应用。

关键词：冷冻熟面冻融循环可得然胶质构特性

Recurrent Neural Network Inspired Finite-Time Control Design

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IEEE/CAA Journal of Automatica Sinica 2024年第6期11卷 1527-1529页

作者： Jianan liu Shihua Li Rongjie liu School of Automation Southeast UniversityNanjing 210096China Department of Statistics Florida State UniversityFL 32304 USA IEEE

Dear Editor,This letter is concerned with the role of recurrent neural networks(RNNs)on the controller design for a class of nonlinear *** by the architectures of RNNs,the system states are stacked according to the dynamic along with time while the controller is represented as the neural network *** build the bridge between RNNs and finite-time controller,a novel activation function is imposed on RNNs to drive the convergence of states at finite-time and propel the overall control process *** stability proof is briefly provided for the convergence of the proposed finite-time *** last,a numerical simulation example is presented to illustrate the efficiency of the proposed *** networks can be classified as static(feedforward)and dynamic(recurrent)nets[1].The former nets do not perform well in dealing with training data and using any information of the local data structure[2].In contrast to the feedforward neural networks,RNNs are constituted by high dimensional hidden states with dynamics.

关键词： dynamics finite proof

Revealing the role of electrode potential micro-environments in single Mn atoms for carbon dioxide and oxygen electrolysis

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Nano Research 2024年第9期17卷 7957-7966页

作者： Pengcheng liu anyi liu Kaili Wang Shuai Shi Mengmeng Jin Jingxiu liu Tao Qin Qian liu Xijun liu Jia He Tianjin Key Laboratory of Organic Solar Cells and Photochemical Conversion School of Chemistry and Chemical EngineeringInstitute of New-Energy Materials and Low-Carbon TechnologiesSchool of Materials Science and EngineeringTianjin University of TechnologyTianjin 300384China School of Chemistry and Chemical Engineering and Environmental Engineering Weifang UniversityWeifang 261061China Department of Electrical Engineering and Automation Luoyang Institute of Science and TechnologyLuoyang 471023China Institute for Advanced Study Chengdu UniversityChengdu 610106China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for Composite Structures Guangxi Key Laboratory of Processing for Non-ferrous Metals and Featured MaterialsSchool of ResourcesEnvironment and MaterialsGuangxi UniversityNanning 530004China

Elucidation the relationship between electrode potentials and heterogeneous electrocatalytic reactions has attracted widespread *** we construct the well-defined Mn single-atom(MnSA)catalyst with four N-coordination through a simple thermal pyrolysis preparation method to investigate the electrode potential micro-environments effect on carbon dioxide reduction reactions(CO_(2)RR)and oxygen reduction reactions(ORR).MnSA catalysts generate higher CO production Faradaic efficiency of exceeding 90%at-0.9 V for CO_(2)RR and higher H_(2)O_(2)yield from 0.1 to 0.6 V with excellent ORR *** functional theory(DFT)calculations based on constant potential models were performed to study the mechanism of MnSA on CO_(2)*** thermodynamic energy barrier of CO_(2)RR is lowest at-0.9 V *** hydrogen electrode(RHE).Similar DFT calculations on the H_(2)O_(2)yield of ORR showed that the H_(2)O_(2)yield at 0.2 V was *** study provides a reasonable explanation for the role of electrode potential micro-environments.

关键词： electrode potential micro-environments Mn single-atom catalyst carbon dioxide reduction reaction oxygen reduction reaction constant potential models

Experimental and numerical study on ignition and combustion characteristics of boron-magnesium composite powders

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Particuology 2024年第1期84卷 12-29页

作者： Shuyuan liu Luyang Han Hongmei liu Yingkai Song Linlin liu Songqi Hu Science and Technology on Combustion Internal Flow and Thermo-Structure LaboratoryNorthwestern Polytechnical UniversityXi'an710072China School of Mechanical Engineering and Rail Transit Changzhou UniversityChangzhou213164China Shanghai Institute of Space Propulsion Shanghai201112China Shanghai Engineering Research Center of Space Engine Shanghai201112China

A high-pressure laser ignition and combustion system with adjustable oxidizer gas atmosphere is established to investigate the ignition and combustion characteristics of boron-magnesium(BM)com-posite *** ignition and combustion model of BM powders is established and validated in the present *** results show that increasing water content,O_(2) content and Mg content all result in shorter ignition delay time of BM powders,among which the effect of water content is the most ***,ignition delay time increases as pressure *** combustion time decreases with increasing Mg content and ambient pressure but increases with water *** the increase of O_(2) content,combustion time of BM powders first increases and then decreases,which means a critical O_(2) content exists above which combustion time *** results show that there exists a trade-off between ignition and combustion performance of BM composite powders.

关键词： Boron magnesium powder Laser ignition Ignition and combustion model Reaction mechanism Numerical model

CFD-DEM simulation of high density particles fluidization behaviors in 3D conical spouted beds

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Particuology 2024年第5期88卷 266-281页

作者： Lin Jiang Mofan Qiu Rongzheng liu Bing liu Youlin Shao Malin liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy TechnologyTsinghua UniversityBeijing 100084China

The spouted bed has been used in the coating process of high-density nuclear fuel *** particle fluidization behaviors in pseudo-2D and 3D spouted beds were simulated and *** effects of four independent variables(cone angle,particle density,inlet gas velocity,and particle loading)on particle fluidization behaviors in the 3D spouted bed were investigated *** cone angle effect on fluidization mechanism was studied quantitatively first time.A new fluidization quality index was proposed based on the particle entrainment principle,and an extreme value was obtained when the cone angle was 60°,considered to be the optimum value for the 3D conical spouted *** was indicated the gas–solid contact efficiency can be kept up if the gas velocity was proportional to ρ_(p)^(0.65) and N_(p)^(0.78) when the particle density or loading was *** results will be useful for geometry and operation parameters design of the 3D conical spouted bed and helpful for developing the fluidization mechanism of high-density particles.

关键词： Spouted bed High-density particle CFD-DEM Fluidization quality index Particle loading

Control Strategies for Digital Twin Systems

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IEEE/CAA Journal of Automatica Sinica 2024年第1期11卷 170-180页

作者： Guo-Ping liu IEEE the Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

With the continuous breakthrough in information technology and its integration into practical applications, industrial digital twins are expected to accelerate their development in the near future. This paper studies various control strategies for digital twin systems from the viewpoint of practical *** make full use of advantages of digital twins for control systems, an architecture of digital twin control systems, adaptive model tracking scheme, performance prediction scheme, performance retention scheme, and fault tolerant control scheme are proposed. Those schemes are detailed to deal with different issues on model tracking, performance prediction, performance retention, and fault tolerant control of digital twin systems. Also, the stability of digital twin control systems is analysed. The proposed schemes for digital twin control systems are illustrated by examples.

关键词： Digital twin control systems fault tolerant control model tracking performance prediction performance retention

Relation Between the Eventual Continuity and the E-property for Markov-Feller Semigroups

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Acta Mathematicae Applicatae Sinica 2024年第1期40卷 1-16页

作者： Yong liu Zi-yu liu LMAM School of Mathematical SciencePeking UniversityBeijing100871China

We investigate some relations between two kinds of semigroup regularities, namely the e-property and the eventual continuity, both of which contribute to the ergodicity for Markov processes on Polish *** precisely, we prove that for Markov-Feller semigroup in discrete time and stochastically continuous MarkovFeller semigroup in continuous time, if there exists an ergodic measure whose support has a nonempty interior,then the e-property is satisfied on the interior of the support. In particular, it implies that, restricted on the support of each ergodic measure, the e-property and the eventual continuity are equivalent for the discrete-time and the stochastically continuous continuous-time Markov-Feller semigroups.

关键词： Markov-Feller semigroup ergodicity e-property eventual continuity

双向摩擦特性Dahl模型的布料仿真稳定性提升

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燕山大学学报 2021年第2期45卷 168-173页

作者：唐勇李玲刘志蕾赵静吕梦雅燕山大学信息科学与工程学院河北秦皇岛066004 河北省计算机虚拟技术与系统集成重点实验室河北秦皇岛066004

针对布料仿真中单向摩擦特性所导致的布料运动稳定性弱的问题,提出了双向摩擦特性的Dahl模型处理布料摩擦接触的仿真方法。首先,采用忽略质点弹簧模型中剪切弹簧力的方法对布料进行建模,保证布料模型的稳定性,同时通过设定形变系数的最... 详细信息

针对布料仿真中单向摩擦特性所导致的布料运动稳定性弱的问题,提出了双向摩擦特性的Dahl模型处理布料摩擦接触的仿真方法。首先,采用忽略质点弹簧模型中剪切弹簧力的方法对布料进行建模,保证布料模型的稳定性,同时通过设定形变系数的最大值来约束布料的弹性形变,从而达到改善超弹的目的;其次,为进一步增强风场中布料运动的稳定性,在Dahl模型的布料摩擦力的计算过程中,引入表示双向摩擦力的微分项,不仅完善布料的摩擦特性,还提高了绘制的效率;最后,利用插值法的思想通过质点位置、距离当前质点位置的最小值以及最大值这3个因子来优化二分法的时间步长,从而达到复杂度相同的情况下,绘制速度得到提高的目的。实验结果表明,该方法不仅能够实时地绘制出布料与物体摩擦接触的实验效果,而且提升了绘制的速度,同时增强了布料运动的稳定性。

关键词：布料模拟 Dahl模型质点弹簧模型二分法

毕赤酵母中内切β-1,4葡聚糖酶的表达及共培养制备低分子质量黄原胶

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食品与发酵工业 2023年第9期49卷 1-8页

作者：许颖刘智磊詹晓北蒋芸李志涛高敏杰江南大学生物工程学院糖化学与生物技术教育部重点实验室江苏无锡214122

低分子质量黄原胶具有抑菌、益生及抗氧化等多种生物活性,因此通过水解制备低分子质量黄原胶具有广阔应用前景。该研究将来源于绵羊瘤胃元基因组的内切β-1,4-葡聚糖酶首次在毕赤酵母中表达,其在pH 7.0和75℃下发挥最佳作用,并有较高的p... 详细信息

低分子质量黄原胶具有抑菌、益生及抗氧化等多种生物活性,因此通过水解制备低分子质量黄原胶具有广阔应用前景。该研究将来源于绵羊瘤胃元基因组的内切β-1,4-葡聚糖酶首次在毕赤酵母中表达,其在pH 7.0和75℃下发挥最佳作用,并有较高的pH和温度稳定性。此后,建立了毕赤酵母和野油菜黄单胞菌的共培养体系并对发酵条件进行优化,其中野油菜黄单胞菌生成的黄原胶可以被毕赤酵母分泌的内切β-1,4-葡聚糖酶直接降解产生低分子质量黄原胶。摇瓶水平下,共培养体系中总糖最高为11.4 g/L,水解产物中重均分子质量为2500 Da的低分子质量黄原胶达到93.79%。该研究为功能性低分子质量黄原胶的工业化生产提供了一个潜在的策略。

关键词：内切β-1,4-葡聚糖酶毕赤酵母发酵优化共培养低分子质量黄原胶