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Lignin-based carbon fibres:Effect of bio-polyamide on oxidative thermal stabilisation of lignin 认领 引用 被引量：2
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作者 Baljinder K.Kandola Muhammed Hajee +1 位作者 Annan Xiang A.Richard Horrocks 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2025年第4期191-208,共18页
Carbon fibres have been produced from hydroxypropyl-modified lignin(TcC)/bio-based polyamide 1010(PA1010)blended filaments.Two grades of PA1010,with different molecular weights and rheological properties,were used for... Carbon fibres have been produced from hydroxypropyl-modified lignin(TcC)/bio-based polyamide 1010(PA1010)blended filaments.Two grades of PA1010,with different molecular weights and rheological properties,were used for blending with TcC.An oxidative thermal stabilisation step was used prior to carbonisation in an inert atmosphere to prevent the fusion of the filaments during the latter step.Thermal stabilisation was not possible using a one-step stabilisation process reported in the literature for lignin and other lignin/synthetic polymer blends.As a consequence,a cyclic process involving an additional isothermal phase at a lower temperature than the precursor filaments’melting point,was introduced to increase the cross-linking reactions between the lignin and polyamide.Thermally stabilised filaments were characterised by DSC,TGA,TGA-FTIR,ATR,and SEM techniques.Polymer rheology and heating rate used during thermal stabilisation influenced the thermal stabilisation process and mechanical properties of the derived filaments.Thermally stabilised filaments using optimised conditions(heating in the air atmosphere at 0.25℃/min to 180℃;isothermal for 1 h,cooling back down to ambient at 5℃/min;heating to 250℃ at 0.25℃/min,isothermal for 2 h)could be successfully carbonised.Carbon fibres pro-duced had void-free morphologies and mechanical properties comparable to similarly thermally stabilised and carbonised polyacrylonitrile(PAN)filaments. 展开更多
关键词 Lignin Polyamide Blends Filaments Precursor Thermal stabilisation Carbonization
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In-situ stabilisation followed by ex-situ composting for treatment and disposal of heavy metals polluted sediments 认领 引用 被引量：6
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作者 YU Guangwei LEI Hengyi +3 位作者 BAI Tao LI Zhong YU Qiang SONG Xianqiang 《Journal of Environmental Sciences》 SCIE EI CAS 2009年第7期877-883,共7页
An innovative in-situ stabilisation treatment followed by ex-situ sediment composting was tested for its ability to treat and dispose of heavy-metal-polluted sediments in a river near the Chinese Pearl Delta. First, p... An innovative in-situ stabilisation treatment followed by ex-situ sediment composting was tested for its ability to treat and dispose of heavy-metal-polluted sediments in a river near the Chinese Pearl Delta. First, polluted sediments were treated in-situ to stabilise the heavy metals. Then the treated sediments were dredged, dewatered and sent for high temperature aerobic composting （HTAC） treatment. Finally, the compost products were used as a fertiliser for fiver bank plants. The stabilisation efficiency of heavy metals during the process was investigated and the results are as follows： （1） using in-situ stabilisation, the extraction concentrations of Cu, Zn and Pb were reduced by 65.0%, 82.2% and 90.0%, respectively, which are much lower than the national standard given in the Identification Standard for Hazardous Waste （GB5085.3-1996）; （2） chemical fraction analysis showed that heavy metals were further stabilized during the HTAC treatment; （3） the concentrations of Cu, Zn and Pb in rainwater leachate through the river bank met the level of class V in the Environmental Quality Standards for Surface Water in China （GB3838-2002）. Therefore, using this new process, the toxicities of heavy metals in sediments were reduced markedly. 展开更多
关键词 contaminated sediments treatment and disposal heavy metal in-situ stabilisation resource utilisation
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Emerging trends in expansive soil stabilisation: A review 认领 引用 被引量：30
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作者 Chijioke Christopher Ikeagwuani Donald Chimobi Nwonu 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2019年第2期423-440,共18页
Expansive soils are problematic due to the performances of their clay mineral constituent, which makes them exhibit the shrink-swell characteristics. The shrink-swell behaviours make expansive soils inappropriate for ... Expansive soils are problematic due to the performances of their clay mineral constituent, which makes them exhibit the shrink-swell characteristics. The shrink-swell behaviours make expansive soils inappropriate for direct engineering application in their natural form. In an attempt to make them more feasible for construction purposes, numerous materials and techniques have been used to stabilise the soil. In this study, the additives and techniques applied for stabilising expansive soils will be focused on,with respect to their efficiency in improving the engineering properties of the soils. Then we discussed the microstructural interaction, chemical process, economic implication, nanotechnology application, as well as waste reuse and sustainability. Some issues regarding the effective application of the emerging trends in expansive soil stabilisation were presented with three categories, namely geoenvironmental,standardisation and optimisation issues. Techniques like predictive modelling and exploring methods such as reliability-based design optimisation, response surface methodology, dimensional analysis, and artificial intelligence technology were also proposed in order to ensure that expansive soil stabilisation is efficient. 展开更多
关键词 Expansive soil Engineering properties Soil stabilisation Geoenvironmental issues Standardisation Optimisation
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Incorporation of a nanotechnology-based additive in cementitious products for clay stabilisation 认领 引用 被引量：6
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作者 E.U.Eyo S.Ng’ambi S.J.Abbey 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2020年第5期1056-1069,共14页
The mechanical performances and water retention characteristics of clays,stabilised by partial substitution of cement with by-products and inclusion of a nanotechnology-based additive called RoadCem(RC),are studied in... The mechanical performances and water retention characteristics of clays,stabilised by partial substitution of cement with by-products and inclusion of a nanotechnology-based additive called RoadCem(RC),are studied in this research.The unconfined compression tests and one-dimensional oedometer swelling were performed after 7 d of curing to understand the influence of addition of 1%of RC material in the stabilised soils with the cement partially replaced by 49%,59%and 69%of ground granulated blast furnace slag(GBBS)or pulverised fuel ash(PFA).The moisture retention capacity of the stabilised clays was also explored using the soil-water retention curve(SWRC)from the measured suctions.Results confirmed an obvious effect of the use of RC with the obtained strength and swell properties of the stabilised clays suitable for road application at 50%replacement of cement.This outcome is associated with the in-depth and penetrating hydration of the cementitious materials by the RC and water which results in the production of needle-like matrix with interlocking filaments e a phenomenon referred to as the‘wrapping’effect.On the other hand,the SWRC used to describe the water holding capacity and corresponding swell mechanism of clays stabilised by a proportion of RC showed a satisfactory response.The moisture retention of the RC-modified clays was initially higher but reduced subsequently as the saturation level increased with decreasing suction.This phenomenon confirmed that clays stabilised by including the RC are water-proof in nature,thus ensuring reduced porosity and suction even at reduced water content.Overall,the stabilised clays with the combination of cement,GGBS and RC showed a better performance compared to those with the PFA included. 展开更多
关键词 Cement Ground granulated blast furnace slag(GBBS) Fly ash RoadCem(RC) Swell Stabilisation Unconfined compressive strength Soil-water retention curve(SWRC)
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Laboratory-scale model of carbon dioxide deposition for soilstabilisation 认领 引用 被引量：3
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作者 Mohammad Hamed Fasihnikoutalab Afshin Asadi +3 位作者 Bujang Kim Huat PaulWestgate Richard JBall Shahram Pourakbar 《Journal of Rock Mechanics and Geotechnical Engineering》 CSCD 2016年第2期178-186,共9页
Olivine sand is a natural mineral,which,when added to soil,can improve the soil’s mechanical properties while also sequester carbon dioxide(CO2)from the surrounding environment.The originality of this paper stems fro... Olivine sand is a natural mineral,which,when added to soil,can improve the soil’s mechanical properties while also sequester carbon dioxide(CO2)from the surrounding environment.The originality of this paper stems from the novel two-stage approach.In the first stage,natural carbonation of olivine and carbonation of olivine treated soil under different CO2pressures and times were investigated.In this stage,the unconfined compression test was used as a tool to evaluate the strength performance.In the second stage,details of the installation and performance of carbonated olivine columns using a laboratory-scale model were investigated.In this respect,olivine was mixed with the natural soil using the auger and the columns were then carbonated with gaseous CO2.The unconfined compressive strengths of soil in the first stage increased by up to 120% compared to those of the natural untreated soil.The strength development was found to be proportional to the CO2pressure and carbonation period.Microstructural analyses indicated the presence of magnesite on the surface of carbonated olivinetreated soil,demonstrating that modified physical properties provided a stronger and stiffer matrix.The performance of the carbonated olivine-soil columns,in terms of ultimate bearing capacity,showed that the carbonation procedure occurred rapidly and yielded a bearing capacity value of 120 k Pa.Results of this study are of significance to the construction industry as the feasibility of carbonated olivine for strengthening and stabilizing soil is validated.Its applicability lies in a range of different geotechnical applications whilst also mitigates the global warming through the sequestration of CO2. 展开更多
关键词 Olivine Soil stabilisation CO_2 deposition Climate change Unconfined compressive strength Microstructure analysis
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Effects of Lateral Variation in Vegetation and Basin ‘Dome' Shape on Tropical Lowland Peat Stabilisation in the Kota Samarahan-Asajaya Area, West Sarawak, Malaysia 认领 引用
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作者 Mohamad Tarmizi Mohamad ZULKIFLEY Tham Fatt NG +2 位作者 John Kuna RAJ Roslan HASHIM Muhammad Aqeel ASHRAF 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2014年第3期894-914,共21页
Field surveys indicate lateral variation in peat humification levels （von Post） in dominantly occurring fibric,fibric to hemic,sapric and hemie to sapric peats across a gradient from the margin towards the centre of... Field surveys indicate lateral variation in peat humification levels （von Post） in dominantly occurring fibric,fibric to hemic,sapric and hemie to sapric peats across a gradient from the margin towards the centre of tropical lowland peat domes.Cement-peat stabilisation can be enhanced by adding mineral soil fillers （silt,clays and fine sands） obtained from Quaternary floodplain deposits and residual soil （weathered schist）.The unconfined compressive strength （UCS） of the stabilised cement-mineral soil fifler-peat mix increases with the increased addition of selected mineral soil filler.Lateral variation in the stabilised peat strength （UCS） in the top 0 to 0.5 m layer was found from the margin towards the centre of the tropical lowland peat dome.The variations in the UCS of stabilised tropical lowland peats along a gradient from the periphery towards the centre of the peat dome are most likely caused by a combination of factors due to variations in the mineral soil or ash content of the peat and horizontal zonation or lateral variation in the dominant species of the plant assemblages （due to successive vegetation zonation of the peat swamp forest from the periphery towards the centre of the tropical lowland peat dome）. 展开更多
关键词 tropical lowland peat dome/basin mineral soil filler cement-filler-peat stabilisation,topogenic unconfined compressive strength lateral vegetation succession.
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Performance Evaluation of Waste Stabilisation Ponds 认领 引用 被引量：2
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作者 O. P. Gopolang M. W. Letshwenyo 《Journal of Water Resource and Protection》 CAS 2018年第11期1129-1147,共19页
Waste stabilisation pond system has been used more especially in developing countries for sewage treatment. The objective of this study was to investigate the hydraulic and performance efficiency of Palapye waste stab... Waste stabilisation pond system has been used more especially in developing countries for sewage treatment. The objective of this study was to investigate the hydraulic and performance efficiency of Palapye waste stabilisation ponds. The hydraulic efficiency was evaluated through drogue, pond geometry and sludge accumulation assessment. The performance efficiency was evaluated through periodic sampling and analysis of physiochemical and bacteriological parameters of individual units and of the system as a whole. Except for the maturation ponds, the depth of the anaerobic pond had reduced from 4 m to 0.45 m, for facultative ponds from 2.0 m to a range of 0.52 m - 0.91 m. The design hydraulic retention time of the system had reduced from 20 days to 7.1 days. The concentration of some physiochemical parameters in the effluent was 305 mg·L-1, 277 Nephelometric Turbidity Units (NTU), 204 mg·L-1, 156 mg·L-1, 110 mg·L-1, and 15 mg·L-1 being total suspended solids, turbidity, nitrates, chemical oxygen demand, biochemical oxygen demand and phosphate respectively. These values were more than the standard limits of the country. Effluent total coliforms concentration was 3.6 log units and within the threshold of 4.3 log units, faecal coliforms concentration was 3.5 log units, slightly higher than the threshold of 3 log units. Though Escherichia coli have no limits for discharge into other environments, the concentration in the effluent was reasonable at 2.5 log units and also within irrigation limit of 3 log counts. Palapye wastewater treatment system hydraulic efficiency is lower than the design criterion. The system was overall poor in physiochemical parameters removal but better in bacteriological removal. 展开更多
关键词 Hydraulic Efficiency Waste Stabilisation Ponds Length to Width Ratio Pond Geometry
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Models to predict sunlight-induced photodegradation rates of contaminants in wastewater stabilisation ponds and clarifiers 认领 引用
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作者 Xi-Zhi Niu 《Water Science and Engineering》 EI CAS CSCD 2019年第4期293-297,共5页
Two kinetic models were established for conservative estimates of photodegradation rates of contaminants under sunlight irradiation,in particular for wastewater stabilisation ponds and clarifiers in conventional waste... Two kinetic models were established for conservative estimates of photodegradation rates of contaminants under sunlight irradiation,in particular for wastewater stabilisation ponds and clarifiers in conventional wastewater treatment plants.These two models were designated for(1)contaminants with high photolytic rates or high photolytic quantum yields,whose photodegradation is unlikely to be enhanced by aquatic photosensitisers;and(2)contaminants withstanding direct photolysis in sunlit waters but subjected to indirect photolysis.The effortlessly intelligible prediction procedure involves sampling and analysis of real water samples,simulated solar experiments in the laboratory,and transfer of the laboratory results to realise water treatment using the prediction models.Although similar models have been widely used for laboratory studies,this paper provides a preliminary example of translating laboratory results to the photochemical fate of contaminants in real waters. 展开更多
关键词 Sunlight irradiation Photodegradation Contaminants Stabilisation ponds Solar water treatment
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Stabilisation of Pb in Pb Smelting Slag-Contaminated Soil by Compost-Modified Biochars and Their Effects on Maize Plant Growth 认领 引用 被引量：1
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作者 Mary B. Ogundiran Olamide O. Lawal Sifau A. Adejumo 《Journal of Environmental Protection》 2015年第8期771-780,共10页
Compost has been used to stabilise lead (Pb) in soil. However, compost contains a high level of dissolved organic matter (DOM) which may make Pb bioavailable in plant and thereby limiting its effectiveness and applica... Compost has been used to stabilise lead (Pb) in soil. However, compost contains a high level of dissolved organic matter (DOM) which may make Pb bioavailable in plant and thereby limiting its effectiveness and application. Addition of biochar to compost can reduce this effect. Rice husk (RH) and Cashew nut shell (CNS) biochars and compost-modified biochars were used in comparison to compost for stabilizing Pb in lead smelting slag (LSS)-contaminated soil (Pb = 18,300 mg/kg) in Nigeria. Efficiency of Pb stabilisation in control and amended soils was assessed using CaCl2 batch leaching experiment and plant performance. In pot experiments, maize plant was grown on the contaminated soil and on soil treated with minimum and optimum doses of the amendments singly and in combination for 6 weeks. Agronomical and chemical parameters of the plants were measured. CaCl2-extractable Pb in the untreated soil was reduced from 60 mg/kg to 0.55 mg/kg in RHB amended soils and non-detectable in other amended soils. RH-biochar/compost increased plant height, number of leaf and leaf area more than the others. Similarly, at minimum rate, it reduced root and shoot Pb by 91% and 86.0% respectively. Compost-modified rice husk biocharstabilised Pb in lead smelting slag contaminated soil reduced Pb plant uptake and improved plant growth. Lead stabilisation through the use of rice husk biochar with compost may be a green method for remediation of lead smelting slag-contaminated soil. 展开更多
关键词 Biochar Compost-Modified Biochar Lead Smelting Slag Lead Stabilisation
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SPH Particle Collisions for the Reduction of Particle Clustering, Interface Stabilisation and Wall Modelling 认领 引用
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作者 Arno Kruisbrink Stan Korzilius +1 位作者 Frazer Pearce Hervé Morvan 《Journal of Applied Mathematics and Physics》 2018年第9期1860-1882,共23页
The pair-wise forces in the SPH momentum equation guarantee the conservation of momentum, but they cannot prevent particle clustering and wall penetration. Particle clustering may occur for several reasons. A fundamen... The pair-wise forces in the SPH momentum equation guarantee the conservation of momentum, but they cannot prevent particle clustering and wall penetration. Particle clustering may occur for several reasons. A fundamental issue is the tensile instability, which is caused by negative numerical pressures. Clustering may also occur due to certain properties of the kernel gradient. Discontinuities in the pressure and its gradient, due to surface tension and gravity, may cause particle instabilities near the interface between two fluids. Wall penetration is also a form of particle clustering. In this paper the particle collision concept is introduced to suppress particle clustering. Here, the use of kinematic conditions (motion) rather than dynamic conditions (forces) is explored. These kinematic conditions are obtained from kinetic collision theory. Conservation of momentum is maintained, and under elastic conditions conservation of energy as well. The particle collision model only becomes active when needed. It may be seen as a particle shifting method, in the sense that the velocities are changed, and as a consequence of that the particle positions change. It is demonstrated in several case studies that the particle collision model allows for realistic (low) viscosities. It was also found to stabilise the interface between two fluids up to high, realistic density ratios (1000:1) in typical liquid-gas applications. As such it can be used as a multi-fluid model. The concept allows for real wave speed ratios (and far beyond), which, as well as real viscosities, are essential in the modelling of heat transfer applications. The collisions with walls allow for no-slip conditions at real viscosities while wall penetration is suppressed. In summary, the particle collision model makes SPH more robust for engineering. 展开更多
关键词 SPH Particle Clustering Multiphase Flow Interface Stabilisation Wall Modelling
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Sufficient and necessary conditions for exponential stabilisation of distributed second-order bilinear systems with time-varying delay 认领 引用
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作者 A.Tsouli O.Ghilli M.Ouarit 《Journal of Control and Decision》 EI 2026年第4期1196-1208,共13页
In this paper,we deal with the problem of exponential stabilisation for a class of distributed second-order bilinear systems.The systems under consideration come with a time-varying delay and are evolving in a Hilbert... In this paper,we deal with the problem of exponential stabilisation for a class of distributed second-order bilinear systems.The systems under consideration come with a time-varying delay and are evolving in a Hilbert space.A new stabilising feedback law is proposed.Existence and uniqueness of the mild solution for the controlled system are proved.Moreover,under a new controllability condition which is both sufficient and necessary,we establish exponential stabilisation results and provide an explicit decay rate estimate.Some illustrating applications are displayed. 展开更多
关键词 Bilinear systems second order exponential stabilisation decay estimate varying time delay
Predefined-time adaptive robust simultaneous stabilisation control for two nonlinear singular time-delay systems 认领 引用
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作者 Xiaotong Liu Renming Yang 《Journal of Control and Decision》 EI 2026年第2期319-338,共20页
This paper mainly studies the simultaneous stabilisation control problem of a class of nonlinear singular systems with predefined time.We first develop two singular system in differential algebraic forms via an approp... This paper mainly studies the simultaneous stabilisation control problem of a class of nonlinear singular systems with predefined time.We first develop two singular system in differential algebraic forms via an appropriate state feedback.And then the two systems are extended to one system for further research.We have solved the difficulty of constructing Lyapunov functions by constructing appropriate Hamiltonian functions for our research.In addition,when considering nonlinear singular systems with unknown disturbances,parameter uncertainties and time delays,a control strategy is developed to achieve simultaneous stabilisation within a predefined time.Finally,the effectiveness of the proposed controller was verified through simulation. 展开更多
关键词 Nonlinear singular system simultaneous stabilisation predefined time adaptive robust control
Quadratic stabilisation of switched affine systems 认领 引用 被引量：3
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作者 Minqing Xiao Guisheng Zhai Chi Huang 《Journal of Control and Decision》 EI 2020年第1期1-23,共23页
Minqing Xiao received the Ph.D.degree from Chongqing University,Chongqing,China,in 2008.He is currently a Professor with the College of Mathematics and Informatics,Fujian Normal University,Fuzhou,China.His current res... Minqing Xiao received the Ph.D.degree from Chongqing University,Chongqing,China,in 2008.He is currently a Professor with the College of Mathematics and Informatics,Fujian Normal University,Fuzhou,China.His current research interests include robust control/filter theory,delta operator systems,networked control systems,and switched systems;Guisheng Zhai received his B.S.degree from Fudan University,China,in 1988,and he received his M.E.and Ph.D.degrees,both in system science,from Kobe University,Japan,in 1993 and 1996,respectively.After two years of industrial experience,Dr.Zhai moved to Wakayama University,Japan,in 1998,and then to Osaka Prefecture University,Japan,in 2004.He held visiting professor positions at University of Notre Dame from August 2001 to July 2002,and at Purdue University from March 2016 through February 2017.In April 2010,he joined the faculty board of Shibaura Institute of Technology,Japan,where he currently is a full Professor of Mathematical Sciences.His research interests include large scale and decentralised control systems,robust control,switched systems and switching control,networked control and multi-agent systems,neural networks and signal processing,etc.Dr.Zhai is on the editorial board of several academic journals including IET Control Theory&Applications,International Journal of Applied Mathematics and Computer Science,Journal of Control and Decision,and Frontiers of Mechanical Engineering.He is a Senior Member of IEEE,a member of ISCIE,SICE,JSST and JSME. 展开更多
关键词 Switched affine systems(SAS) switched uncertain affine systems(SUAS) quadratic stabilisation convex combination state-dependent switching output-dependent switching convergence set LMIs norm bounded uncertainties
STABILISE技术治疗主动脉夹层残余假腔的早期安全性及有效性 认领 引用
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作者 计佳杰 秦永林 +4 位作者 曾楚慧 柏志斌 宋晓雯 赵国峰 邓钢 《介入放射学杂志》 CSCD 北大核心 2026年第8期853-857,共5页
目的探讨STABILISE技术用于治疗主动脉夹层残余假腔的安全性及有效性。方法纳入2022年8月至2025年7月东南大学附属中大医院接受STABILISE技术治疗的主动脉夹层患者8例,收集基线资料及术前、术后影像资料,结合术中操作情况,对比分析治疗... 目的探讨STABILISE技术用于治疗主动脉夹层残余假腔的安全性及有效性。方法纳入2022年8月至2025年7月东南大学附属中大医院接受STABILISE技术治疗的主动脉夹层患者8例,收集基线资料及术前、术后影像资料,结合术中操作情况,对比分析治疗前后胸主动脉平面、内脏动脉平面及腹主动脉下段的真假腔变化,并记录术中、术后并发症发生情况。结果8例患者接受STABILISE技术治疗均获成功,无术中及术后操作相关并发症。术后1周,4例患者胸段假腔完全形成血栓,8例内脏区腹主动脉及髂动脉段夹层假腔完全消失。术中重建肾动脉2例、肠系膜上动脉2例,术后无内脏动脉缺血。与术前相比,腹主动脉内脏区主动脉直径较术前显著缩小(P<0.05)。术中、术后未见并发症发生。结论STABILISE技术治疗主动脉夹层患者的残余夹层安全有效,短期可增大主动脉真腔管径,促进假腔消失、血流重塑。 展开更多
关键词 主动脉夹层 腔内治疗 支架置入 STABILISE技术
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Decentralised controller design for robust stabilisation and L2 gain of nonlinear interconnected systems 认领 引用
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作者 Heng Kang Minqing Xiao Guisheng Zhai 《Journal of Control and Decision》 EI 2024年第4期789-802,共14页
In this paper,a decentralised controller is extended for robust stabilisation and L2 gain analysis of a class of nonlinear interconnected systems via dynamic output feedback control within the LMI framework.This la... In this paper,a decentralised controller is extended for robust stabilisation and L2 gain analysis of a class of nonlinear interconnected systems via dynamic output feedback control within the LMI framework.This large-scale system is composed of linear subsystems coupled by nonlinear time-varying interconnections satisfying quadratic constraints.An LMI approach is sufficiently proposed as a feasibility problem of a BMI with respect to controller gains via dynamic output feedback structure.An example of inverted pendulums is used to illustrate the applicability of extended approach. 展开更多
关键词 Nonlinear interconnected systems dynamic output feedback robust stabilisation L2gain analysis linear matrix inequality(LMI) bilinear matrix inequality(BMI)
Robust adaptive passification and global stabilisation for uncertain switched nonlinear systems 认领 引用
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作者 Shuo Liu Hongbo Pang 《Journal of Control and Decision》 EI 2019年第2期75-89,共15页
In this paper,we focus on the problems of feedback passification and global stabilisation for a class of uncertain switched non-linear systems with parameter uncertainties and structural uncertainties.A state-dependen... In this paper,we focus on the problems of feedback passification and global stabilisation for a class of uncertain switched non-linear systems with parameter uncertainties and structural uncertainties.A state-dependent switching law and adaptive feedback controllers are designed to render the resulting closed-loop systems passive.The corresponding passivity-based adaptive stabilisation problems for these systems are solved.Finally,a numerical example is presented to illustrate the effectiveness of our method. 展开更多
关键词 Switched non-linear systems robust adaptive passification global stabilisation
Stability and stabilisation of Markovian jump systems under fast switching:an averaging approach 认领 引用
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作者 Guoliang Wang Yande Zhang Yunshuai Ren 《Journal of Control and Decision》 EI 2023年第4期572-583,共12页
This paper addresses the problems of stability and stabilisation of Markovian jump systems(MJSs)with fast switching.First,a novel model by applying an averaging approach to the fastswitching is proposed.Then,a new met... This paper addresses the problems of stability and stabilisation of Markovian jump systems(MJSs)with fast switching.First,a novel model by applying an averaging approach to the fastswitching is proposed.Then,a new method for constructing an auxiliary system is given to makethe stability analysis.It is proved that the stability of the originally fast switching MJS couldbe guaranteed by an MJS with an average switching,if the fast switching achieves its averageapproximation sufficiently fast.Based on the proposed results,some extensions about generally stabilising controllers are considered,where the fault-tolerant situation is involved too.All the conditions are presented in terms of LMIs.Finally,two numerical examples are used todemonstrate the effectiveness and superiority of the method. 展开更多
关键词 Markovian jump systems fast switching averaging approach stability stabilisation linear matrix inequalities(LMIs)
Strong and weak output stabilisation for distributed bilinear systems 认领 引用
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作者 Abderrahman Ait Aadi El Hassan Zerrik 《Journal of Control and Decision》 EI 2021年第3期314-321,共8页
This paper is concerned with the output stabilisation for a class of distributed bilinear system evolving in a spatial domain.We give sufficient conditions for strong and weak output stabilisation.Also,the output stab... This paper is concerned with the output stabilisation for a class of distributed bilinear system evolving in a spatial domain.We give sufficient conditions for strong and weak output stabilisation.Also,the output stabilisation is discussed using a minimisation problem.Examples and simulations are given. 展开更多
关键词 Bilinear systems output stabilisation feedback controls decay estimate minimisation problem
Prescribed-time stabilisation control of differential driven automated guided vehicle 认领 引用
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作者 Qiyuan Chen Pengfei 《IET Cyber-Systems and Robotics》 EI 2023年第1期143-153,共11页
The position control problem of differential-driven automated guided vehicles(AGVs)based on the prescribed-time control method is studied.First,an innovative orientation error function is proposed by an auxiliary arcs... The position control problem of differential-driven automated guided vehicles(AGVs)based on the prescribed-time control method is studied.First,an innovative orientation error function is proposed by an auxiliary arcsine function about the orientation angle.Thus,the problem of position control of AGV is transformed into the stabilisation control of the kinematic system.Second,by introducing a reserved time parameter and a smooth switching function,a novel time-varying scaling function is proposed.This novel scaling function avoids the risk of infinite gain in the conventional prescribed-time control method while ensuring the smoothness of control laws.Then,an improved velocity constraint function is proposed using the Gaussian function.Compared with the existing constraint function,the proposed method not only has more smoothness but also solves the balance point errors caused by the large AGV orientation errors.The presented method ensures that the AGV reaches the target position in a prescribed time.Hence,the upper bound of the AGV system state can be determined by adjusting parameters.Matlab simulation results show that the proposed controller can effectively make the AGV system state satisfy the prescribed bound. 展开更多
关键词 Automated guided vehicle kinematic system position control prescribed-time stabilisation
Chinese Macroeconomic Stabilisation and Reform:A Briefing Note 认领 引用
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作者 BryaneMichael 《China & World Economy》 2004年第3期61-69,共9页
While reform of the Chinese public and external sectors has promoted growth, it has alsoled to increasing macroeconomic volatility. Such volatility has largely been due to Chinasde facto administrative and fiscal dece... While reform of the Chinese public and external sectors has promoted growth, it has alsoled to increasing macroeconomic volatility. Such volatility has largely been due to Chinasde facto administrative and fiscal decentralisation and its de jure attempts at reassertingcentral control through fiscal and commercial regulation. Section II will discuss somereasons for Chinas rapid economic growth and discuss the macro-level influences whichcaused output and inflation instability in the period 1979-1996. Section III will discuss theeffects of public sector reform on output and prices. Section IV will explore trade reformseffects on output and prices. The conclusion will discuss implications for stabilisation where stabilisation is taken to comprise economic policies aimed at reducing inflationwhile promoting long-term output growth. 展开更多
关键词 Bank Chinese Macroeconomic Stabilisation and Reform World
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