Publications since joining the University of Pretoria (see full list from Googlescholar)

[200] C. Sanama, X. Xia and M. Nguepnang, PID-MPC implementation on a chiller-fan coil unit, Journal of Mathematics, vol. 2022, 8405361. pdf

[199] M. Masaki, L. Zhang and X. Xia, Fuzzy logic control of plug-in supercapacitor storage for thermoelectric management of batteries, Renewable Energy Focus, 43 (2022) 59-73. pdf

[198] Z. Ren, Y. Dong, D. Lin, L. Zhang, Y. Fan and X. Xia, Managing energy-water-carbon-food nexus for cleaner agricultural greenhouse production: A control system approach, Science of the Total Environment, 848 (2022), 157756. pdf

[197] T. Kunatsa, L. Zhang, and X. Xia, Biogas potential determination and production optimisation through optimal substrate ratio feeding in co-digestion of water hyacinth, municipal solid waste and cow dung, Biofuels, 2022，vol. 13, no. 5, 631-641. [Online]. Available: https://doi.org/10.1080/17597269.2020.1835452 pdf

[196] Y. Zhao, H. Yu and X. Xia, Event-triggered adaptive consensus for stochastic multi-agent systems with saturated input and partial state constraints, Information Sciences 603 (2022) 16-41. pdf

[195] Y. Zhao, H. Yu and X. Xia, Event-triggered adaptive control of multi-agent systems with saturated input and partial state constraints, Journal of the Franklin Institute, 359 (2022) 3333-3365. pdf

[194] T. Tsoka, X. Ye, Y. Chen, D. Gong and X. Xia, Explainable artificial intelligence for building energy performance certificate labelling classification, Journal of Cleaner Production 355 (2022) 131626. pdf

[193] C. Sanama and X. Xia, Modelling and experimental investigation of a vapor compression system under steady state regime, International Journal of Mechanical Engineering and Robotics Research, vol. 11, no. 2, February 2022, pp. 114-122. https://doi:10.18178/ijmerr.11.2.114-122 pdf

[192] T. Kunatsa and X. Xia, A review on anaerobic digestion with focus on the role of biomass co-digestion, modelling and optimization on biogas production and enhancement, Bioresource Technology 344 (2022) 126311. https://doi.org/10.1016/j.biortech.2021.126311 pdf

 [191] T. Kunatsa and X. Xia, Co-digestion of water hyacinth, municipal solid waste and cow dung: a methane optimized biogas-liquid petroleum gas hybrid system, Applied Energy 304 (2021) 117716. https://doi.org/10.1016/j.apenergy.2021.117716 pdf

[190] D. M. Bajany, L. Zhang, Y. Xu and X. Xia, Optimisation approach toward water management and energy security in arid/semiarid regions, Environmental Process (2021) 8: 1455-1488. https://doi.org/10.1007/s40710-021-00537-9 pdf

[189] C. Sanama and X. Xia, Transient state modelling and experimental investigation of the thermal behavior of a vapor compression system, Mathematical Problems in Engineering, vol. 2021, Article ID 994151, 14 pages, doi.org/10.1155/9941451. pdf

[188] D. Lin, L. Zhang and X. Xia, Model predictive control of a Venlo-type greenhouse system considering electrical energy, water and carbon dioxide consumption, Applied Energy, 298 (2021), p. 117163. pdf

[187] L. Zhang, A. Njepu and X. Xia, Minimum cost solution to residential energy-water nexus through rainwater harvesting and greywater recycling, Journal of Cleaner Production, 298 (2021), p. 126742. pdf

[186] Z.Wu, Q. Li, and X. Xia, Multi-timescale forecast of solar irradiance based on multitask learning and echo state network approaches, IEEE Transactions on Industrial Informatics, vol. 17, no. 1, 2021, pp. 300-310. pdf

[185] F. Barzegar, V. Pavlenko, M. Zahid, A. Bello, X. Xia, N. Manyala, K. I. Ozoemena and Q. Abbas, Tuning the nanoporous structure of carbons derived from the composite of cross-linked polymers for charge storage applications, ACS Appl. Energy Mater. 4, 2, 2021, pp. 1763-1773. pdf

[184] Y. Li, H. Yu and X. Xia, Distributed event-triggered output feedback H_∞ control for multi-agent systems with transmission delays, IET Control Theory & Applications, 2021, doi: 10.1049/cth2.12148. pdf

[183] B. Wang, X. Xia, Z. Cheng, and L. Liu, Optimal maintenance planning in building retrofitting with interacting energy effects, Optimal Control Applications and Methods, vol. 41, no. 6, Nov. 2020, pp. 2023–2036. [Online]. Available: https://onlinelibrary.wiley.com/doi/10.1002/oca.2593. pdf

[182] A. Ikuzwe, X. Xia, and X. Ye, Maintenance optimization incorporating lumen degradation failure for energy-efficient lighting retrofit projects, Applied Energy, vol. 267, p. 115003, 2020. [Online]. Available: http://www.sciencedirect.com/science/article/pii/S0306261920305158. pdf

[181] D. Lin, L. Zhang, and X. Xia, Hierarchical model predictive control of Venlo-type greenhouse climate for improving energy efficiency and reducing operating cost, Journal of Cleaner Production, vol. 264, p. 121513, 2020. [Online]. Available: http://www.sciencedirect.com/science/article/pii/S0959652620315602. pdf

[180] D. L. Rodrigues, X. Ye, X. Xia and B. Zhu, Battery energy storage sizing optimisation for different ownership structures in a peer-to-peer energy sharing community, Applied Energy 262 (2020) 114498. pdf

[179] A. Ikuzwe, X. Ye and X. Xia, Energy-maintenance optimisation for retrofitted lighting system incorporating luminous flux degradation to enhance visual comfort, Applied Energy 261 (2020) 114379. pdf

[178] B. Wang, Y. Li, F. Yang and X. Xia, A competitive swarm optimizer-based technoeconomic optimization with appliance scheduling in domestic PV-battery hybrid systems, Complexity, vol 2019, article ID 4824837, 15 page. pdf

[177] B. Zhu, Z. Ren, W. Xie, F. Guo and X. Xia, Active nonlinear partial-state feedback control of contracting force for a pantograph-catenary system, ISA Transactions 91 (2019) 78-89. pdf

[176] J. Mei and X. Xia, Distributed control for a multi-evaporator air conditioning system, Control Engineering Practice 90 (2019) 85-100. pdf

[175] C. Kagiri, L. Zhang and X. Xia, A hierarchical optimisation of a compressed natural gas station for energy and fuelling efficiency under a demand response program, Energies 2019, 12, 2165; doi: 10.3390/en12112165. pdf

[174] M. S. Masaki, L. Zhang and X. Xia, A hierarchical predictive control for supercapacitor-retrofitted grid connected hybrid renewable systems, Applied Energy 242, (2019), 393-402. pdf

[173] F. Barzegar, L. Zhang, A. Bello, N. Manyala and X. Xia, Three dimension modeling of the components in supercapacitors for proper understanding and contribution of each parameter to the final electrochemical performance, Journal of Materials Chemistry A, 2018, 6, 17481-17487. DOI: 10.1039/C8TA04736G pdf

[172] L. Zhang, M. Chennells and X. Xia, A power dispatch model for a ferrochrome plant heat recovery cogeneration system, Applied Energy 227 (2018) 180-189. pdf

[171] M. S. Masaki, L. Zhang and X. Xia, A design approach for multiple drive belt conveyors minimizing life cycle costs, Journal of Cleaner Production 201 (2018) 526-541. pdf

[170] Y. Fan and X. Xia, Building retrofit optimization models using notch test data considering energy performance certificate compliance, Applied Energy 228 (2018) 2140-2152. pdf

[169] Z. Wu and X. Xia, A unified green ship model under the time-of-use tariff, Solar Energy 170 (2018) 991-1000. pdf

[168] C. Kagiri, E. M. Wanjiru, L. Zhang and X. Xia, Optimized response to electricity time-of-use tariff of a compressed natural gas fuelling station, Applied Energy, 222 (2018), 244-256.  pdf

[167] J. Yan, H. Yu and X. Xia, Distributed optimization of multi-agent systems with delayed sampled-data, Neurocomputing, 296 (2018) 100-108. pdf

[166] J. Mei, X. Xia and M. Song, An autonomous hierarchical control for improving indoor comfort and energy efficiency of a direct expansion air conditioning system, Applied Energy, 221 (2018) 450-463. pdf

[165] Y. Fan and X. Xia, Energy-efficiency building retrofit planning for green building compliance, Building and Environment 136 (2018) 312-321. pdf

[164] Z. Wu, K. Zhao and X. Xia, Lighting retrofit and maintenance models with decay and adaptive control, IET Control Theory Appl., 2018, Vol. 12 Iss. 5, pp. 593-600. pdf

[163] Q. Li, Z. Wu and X. Xia, Estimate and characterize PV power at demand-side hybrid system, Applied Energy 218 (2018) 66-77. pdf

[162] H. Carstens, X. Xia and S. Yadavalli, Bayesian energy measurement and verification analysis, Energies 2018, 11, 380; doi:10.3390/en11020380. pdf

[161] H. Carstens, X. Xia, S. Yadavalli, Measurement uncertainty in energy monitoring: Present state of the art, Renewable and Sustainable Energy Reviews 82 (2018) 2791-2805. pdf

[160] E. Wanjiru and X. Xia, Sustainable energy-water management for residential houses with optimal integrated grey and rain water recycling, Journal of Cleaner Production 170 (2018) 1151-1166. pdf

[159] L. Zhang, X. Xia and B. Zhu, A dual-loop control system for dense medium coal washing processes with sampled and delayed measurements, IEEE Transactions on Control Systems Technology, vol. 25, no. 6, November 2017, 2211-2218. pdf

[158] Z. Olinga, X. Xia and X. Ye, A cost-effective approach to handle measurement and verification uncertainties of energy savings, Energy 141 (2017) 1600-1609. pdf

[157] F. Barzegar, A. Bello, J. K. Dangbegnon, N. Manyala and X. Xia, Asymmetric supercapacitor based on activated expanded graphite and pinecone tree activated carbon with excellent stability, Applied Energy 207 (2017) 417-426. pdf

[156] E. Wanjiru, S. Sichilalu and X. Xia, Model predictive control of heat pump water heater-instantaneous shower powered with integrated renewable-grid energy systems, Applied Energy, (2017), 204 (2017) 1333-1346. pdf

[155] H. Carstens, X. Xia and S.Yadavalli, Efficient metering and surveying sampling designs in longitudinal Measurement and Verification for lighting retrofit, Energy and Buildings 154 (2017) 430-447. pdf

[154] B. Zhu, K. Xia and X. Xia, Game-theoretic demand-side management and closed-loop control for a class of networked smart grid, IET Control Theory and Applications, 11 (13) (2017), 2170-2176. pdf

[153] F. Chen, H. Yu and X. Xia, Output consensus of multi-agent systems with delayed and sampled-data, IET Control Theory and Applications, 11 (5) (2017) 632-639. pdf

[152] O. Dzobo and X. Xia, Optimal operation of smart multi-energy hub systems incorporating energy hub coordination and demand response strategy, Journal of Renewable and Sustainable Energy 9 (4) 045501, 2017. pdf

[151] E. Wanjiru, S. Sichilalu and X. Xia, Optimal control of heat pump water heater-instantaneous shower using integrated renewable-grid energy systems, Applied Energy 201 (2017) 332-342. pdf

[150] E. Wanjiru and X. Xia, Optimal energy-water management in urban residential buildings through grey water recycling, Sustainable Cities and Society 32 (2017) 654-668. pdf

[149] H. Carstens, X. Xia, S. Yadavalli and A. Rajan, Efficient longitudinal population survival survey sampling for the measurement and verification of lighting retrofit projects, Energy and Buildings 150 (2017) 163-176. pdf

[148] T. Mathaba and X. Xia, Optimal and energy efficient operation of conveyor belt systems with downhill conveyors, Energy Efficiency (2017) 10: 405-417, DOI 10.1007/s12053-016-9461-8 pdf

[147] X. Xia, Control problems in building energy retrofit and maintenance planning, Annual Reviews in Control, vol. 44, 2017, pp. 78-88. pdf

[146] H. Yu and X. Xia, Adaptive leaderless consensus of agents in jointly connected networks, Neurocomputing, 241 (2017), 64-70. pdf

[145] J. Mei and X. Xia, Energy-efficient predictive control of indoor thermal comfort and air quality in a direct expansion air conditioning system, Applied Energy 195 (2017) 439-452. pdf

[144] F. Yang and X. Xia, Techno-economic and environmental optimization of a household photovoltaic-battery hybrid power system within demand side management, Renewable Energy 108 (2017) 132-143. pdf

[143] M. Michael, L. Zhang and X. Xia, An optimal model for a building retrofit with LEED standard as reference protocol, Energy and Buildings 139 (2017) 22-30. pdf

[142] B. Wang, Z. Wu and X. Xia, A multistate-based control system approach toward optimal maintenance planning, IEEE Transactions on Control Systems Technology, vol. 25, no. 1, January 2017, pp. 374-381. pdf

[141] Y. Fan and X. Xia, A multi-objective optimization model for energy-efficiency building envelope retrofitting plan with rooftop PV system installation and maintenance, Applied Energy 189 (2017) 327-335. pdf

[140] H. Carstens, X. Xia and S. Yadavalli, Low-cost energy meter calibration method for measurement and verification, Applied Energy 188 (2017) 563-575. pdf

[139] Z. Tu,  H.Yu and X. Xia, Decentralized finite-time adaptive consensus of multiagent systems with fixed and switching network topologies, Neurocomputing 219 (2017) 59-67. pdf

[138] S. Sichilalu, T. Mathaba and X. Xia, Optimal control of a wind-PV-hybrid powered heat pump water heater, Applied Energy 185 (2017) 1173-1184. pdf

[137] F. Wamalwa, S. Sichilalu and X. Xia, Optimal control of conventional hydropower plant retrofitted with a cascaded pumpback system powered by an on-site hydrokinetic system, Energy Conversion and Management 132 (2017) 438-451. pdf

[136] Y. Shen, D. Zhang and X. Xia, Continuous observer design for a class of multi-output nonlinear systems with multi-rate sampled and delayed output measurements, Automatica 75 (2017) 127-132. pdf

[135] N. Nwulu and X. Xia, Optimal dispatch for a microgrid incorporating renewables and demand response, Renewable Energy 101 (2017) 16-28. pdf

[134] L. Zhang and X. Xia, Control of industrial energy systems: minining industry as a case study, Control Engineering of China, Vol. 23, No. 12, Dec. 2016. pdf

[133] Y. Shen, D. Zhang and X. Xia, Continuous output feedback stabilization for nonlinear systems based on sampled and delayed output measurements, Int. J. Robust Nonlinear Control 2016; 26:3075-3087. pdf

[132] X. Xia and L. Zhang, Industrial energy systems in view of energy efficiency and operation control, Annual Reviews in Control 42 (2016) 299-308. pdf

[131] B. Zhu and X. Xia, Adaptive model predictive control for unconstrained discrete-time linear systems with parametric uncertainties, IEEE Transactions on Automatic Control, vol. 61, no. 10, October 2016, pp. 3171-3176. pdf

[130] B. Zhu and X. Xia, Lyapunov-based adaptive model predictive control for unconstrained non-linear systems with parametric uncertainties, IET Control Theory Appl., 2016, Vol. 10 Iss. 15, pp. 1937-1943. pdf

[129] L. Mokgonyana, J. Zhang, L. Zhang and X. Xia, Coordinated two-stage volt/var management in distribution networks, Electric Power Systems Research 141 (2016) 157-164. pdf

[128] E. M. Wanjiru, L. Zhang and X. Xia, Model predictive control strategy of energy-water management in urban households, Applied Energy 179 (2016) 821-831. pdf

[127] D. Zhang, Y. Shen and X. Xia, Globally uniformly ultimately bounded observer design for a class of nonlinear systems with sampled and delayed measurements, Kybernetika, Vol. 52 (2016), No. 3, 441-460. pdf

[126] S. Sichilalu, H. Tazvinga and X. Xia, Optimal control of a fuel cell/wind/PV/grid hybrid system with thermal heat pump load, Solar Energy 135 (2016) 59-69. pdf

[125] Z. Wu, B. Wang and X.  Xia, Large-scale building energy efficiency retrofit: concept, model and control, Energy 109 (2016) 456-465. pdf

[124] B. Zhu, X. Xia and Z. Wu, Evolutionary game theoretic demand-side management and control for a class of networked smart grid, Automatica 70 (2016) 94-100. pdf

[123] B.P. Numbi and X. Xia, Optimal energy control of a crushing process based on vertical shaft impactor, Applied Energy 162 (2016) 1653-1661. pdf

[122] D. Setlhaolo and X. Xia, Combined residential demand side management strategies with coordination and economic analysis, Electrical Power and Energy Systems 79 (2016) 150-160. pdf

[121] X. Ye and X. Xia, Optimal metering plan for measurement and verification on a lighting case study, Energy 95 (2016) 580-592. pdf

[120] S. Ntsaluba, B. Zhu and X. Xia, Optimal flow control of a forced circulation solar water heating system with energy storage units and connecting pipes, Renewable Energy 89 (2016) 108-124. pdf

[119] Q. Cheng, S. Ning, X. Xia and F. Yang, Modelling of coal trade process for the logistics enterprise and its optimisation with stochastic predictive control, International Journal of Production Research, 2016, Vol. 54, No. 8, 2241-2259, DOI:10.1080/00207543.2015.1062568 pdf

[118] T. Mathaba and X. Xia, A parametric energy model for energy management of long belt conveyors, Energies 2015, 8(12), 13590-13608; doi:10.3390/en81212375 pdf

[117] E. M. Wanjiru and X. Xia, Energy-water optimization model incorporating rooftop water harvesting for lawn irrigation, Applied Energy 160 (2015) 521-531. pdf

[116] N. I. Nwulu and X. Xia, A combined dynamic economic emission dispatch and time of use demand response mathematical modelling framework, Journal of Renewable and Sustainable Energy 7, 043134 (2015); doi: 10.1063/1.4928875. pdf

[115] N. I. Nwulu and X. Xia, Implementing a model predictive control strategy on the dynamic economic emission dispatch problem with game theory based demand response programs, Energy 91 (2015) 404-419. pdf

[114] U.E. Ekpenyonga, J. Zhang and X. Xia, How information propagation in social networks can improve energy savings based on time of use tariff, Sustainable Cities and Society 19 (2015) 26-33. pdf

[113] H. Tazvinga, B. Zhu and X. Xia, Optimal power flow management for distributed energy resources with batteries, Energy Conversion and Management 102 (2015) 104-110. pdf

[112] SM. Sichilalu and X. Xia, Optimal power dispatch of a grid tied-battery-photovoltaic system supplying heat pump water heaters, Energy Conversion and Management 102 (2015) 81-91. pdf

[111] Z. Wu, X. Xia and B. Zhu, Model predictive control for improving operational efficiency of overhead cranes, Nonlinear Dynamics (2015) 79: 2639-2657. pdf

[110] B. Zhu, H. Tazvinga and X. Xia, Switched model predictive control for energy dispatching of a photovoltaic-diesel-battery hybrid power system, IEEE Transactions on Control Systems Technology, vol. 23, no. 3, May 2015, pp. 1229-1236. pdf

[109] L. Zhang, X. Xia and J. Zhang, Medium density control for coal washing dense medium cyclone circuits, IEEE Transactions on Control Systems Technology, vol. 23, no. 3, May 2015, pp. 1117-1122. pdf

[108] X. Xia and J. Zhang, Operation efficiency optimisation modelling and application of model predictive control, IEEE/CAA Journal of Automatica Sinica, vol. 2, no. 2, April 2015, pp. 166-172. pdf

[107] B.P. Numbi and X. Xia, Systems optimization model for energy management of a parallel HPGR crushing process, Applied Energy 149 (2015) 133-147. pdf

[106] B. Wang and X. Xia, Optimal maintenance planning for building energy efficiency retrofitting from optimization and control system perspectives, Energy and Buildings 96 (2015) 299-308. pdf

[105] Z. Wu, H. Tazvinga and X. Xia, Demand side management of photovoltaic-battery hybrid system, Applied Energy 148 (2015) 294-304. pdf

[104] D. Setlhaolo and X. Xia, Optimal scheduling of household appliances with a battery storage system and coordination, Energy and Buildings 94 (2015) 61-70. pdf

[103] SM. Sichilalu and X. Xia, Optimal energy control of grid tied PV–diesel–battery hybrid system powering heat pump water heater, Solar Energy 115 (2015) 243-254. pdf

[102] A. Chatterjee, L. Zhang and X. Xia, Optimization of mine ventilation fan speeds according to ventilation on demand and time of use tariff, Applied Energy 146 (2015) 65-73. pdf

[101] Z. Wu and X. Xia, Optimal switching renewable energy system for demand side management, Solar Energy 114 (2015) 278-288. pdf

[100] X. Ye, X. Xia, L. Zhang and B. Zhu, Optimal maintenance planning for sustainable energy efficiency lighting retrofit projects by a control system approach, Control  Engineering Practice 37 (2015) 1-10. pdf

[99] Z. Wu, X. Xia and B. Wang, Improving building energy efficiency by multi objective neighbourhood field optimization, Energy and Buildings 87 (2015) 45-56. pdf

[98] N. I. Nwulu and X. Xia, Multi-objective dynamic economic emission dispatch of electric power generation integrated with game theory based demand response programs, Energy Conversion and Management 89 (2015) 963-974. pdf

[97] Z. Wu and X. Xia, Optimal motion planning for overhead cranes, IET Control Theory & Applications, Vol. 8, No. 17, 20 November 2014, pp. 1833-1842. pdf

[96] P. S. Rivadeneira, C. H. Moog, G-B. Stan, C. Brunet, F. Raffi, V. Ferre , V. Costanza, M.J. Mhawej, F. Biafore, D. A. Ouattara, D. Ernst, R. Fonteneau, and X.  Xia, Mathematical modeling of HIV dynamics after antiretroviral therapy initiation: a review, BioResearch Open Access, vol. 3, no. 5, October 2014, doi: 10.1089/biores.2014.0024. pdf

[95] X. Ye, X. Xia and J. Zhang, Optimal sampling plan for clean development mechanism lighting projects with lamp population decay, Applied Energy 136 (2014) 1184-1192. pdf

[94] U. E. Ekpenyonga, J. Zhang, and X. Xia, Mathematical modelling for the social impact to energy efficiency savings, Energy and Buildings 84 (2014) 344 - 351. pdf

[93] P. S. Rivadeneira, C. H. Moog, G-B. Stan, V. Costanza, C. Brunet, F. Raffi, V. Ferre ,  M.J. Mhawej, F. Biafore, D. A. Ouattara, D. Ernst, R. Fonteneau, and X.  Xia, Mathematical modeling of HIV dynamics after antiretroviral therapy initiation: a clinical research study, AIDS Research and Human Retroviruse, Volume 30, Number 9, 2014, 831-834. pdf

[92] S. Qu, X. Xia and J. Zhang, Dynamical behaviors of an Euler discretized sliding mode control systems, IEEE Transactions on Automatic Control, vol. 59, no. 9, September 2014, pp. 2525 - 2529. pdf

[91] H. Tazvinga, B. Zhu and X. Xia, Energy dispatch strategy for a photovoltaic-wind-diesel-battery hybrid power system, Solar Energy 108 (2014) 412-420. pdf

[90] P. Miao, Y. Shen and X. Xia, Finite time dual neural networks with a tunable activation function for solving quadratic programming problems and its application, Neurocomputing 143 (2014), pp 80-89. pdf

[89] B. Wang, X. Xia, and J. Zhang, A multi-objective optimization model for the life-cycle cost analysis and retrofitting planning of buildings, Energy and Buildings 77 (2014) 227-235. pdf

[88] T. Mathaba, X. Xia, and J. Zhang, Analysing the economic benefit of electricity price forecast in industrial load scheduling, Electric Power Systems Research 116 (2014) 158-165. pdf

[87] D. Setlhaolo, X. Xia and J. Zhang, Optimal scheduling of household appliances for demand response, Electric Power Systems Research 116 (2014) 24-28. pdf

[86] H. Carstens, X. Xia, and X. Ye, Improvements to longitudinal Clean Development Mechanism sampling designs for lighting retrofit projects, Applied Energy 126 (2014) 256-265. pdf

[85] B.P. Numbi, J. Zhang, and X. Xia, Optimal energy management for a jaw crushing process in deep mines, Energy 68 (2014) 337-348. pdf

[84] S. Qu, X. Xia and J. Zhang, Dynamics of discrete-time sliding-mode-control uncertain systems with a disturbance compensator, IEEE Transactions on Industrial Electronics, vol. 61, no. 7, July 2014, pp. 3502-3510. pdf

[83] Y. Shen and X. Xia, Adaptive parameter estimation for an energy model of belt conveyor with DC motor, Asian Journal of Control, vol. 16, no. 3, pp. 1-11, May 2014. pdf

[82] A. M. Elaiw, X. Xia and A.M. Shehata, Combined heat and power dynamic economic dispatch with emission limitations using hybrid DE-SQP method, Abstract and Applied Analysis Volume 2013, Article ID 120849, 10 pages http://dx.doi.org/10.1155/2013/120849. pdf

[81] L. Zhang, X. Xia and J. Zhang, Improving energy efficiency of cyclone circuits in coal beneficiation plants by pump-storage systems, Applied Energy 119 (2014) 306-313. pdf

[80] K. M. Abo-Al-Ez, A. Elaiw and X. Xia, A dual-loop model predictive voltage control/sliding-mode current control for voltage source inverter operation in smart microgrids, Electric Power Components and Systems, 42(3-4): 348-360, 2014. pdf

[79] X. Ye, X. Xia and J. Zhang, Optimal sampling plan for clean development mechanism energy efficiency lighting projects, Applied Energy 112 (2013) 1006-1015. pdf

[78] N. Wang, J. Zhang and X. Xia, Desiccant wheel thermal performance modeling for indoor humidity optimal control, Applied Energy 112 (2013) 999-1005. pdf

[77] A. M. Elaiw, X. Xia and A. M. Shehata, Hybrid DE-SQP method for solving combined heat and power dynamic economic dispatch problem, Mathematical Problems in Engineering, Volume 2013, Article ID 982305, 7 pages, http://dx.doi.org/10.1155/2013/982305 pdf

[76] H. Yu, Y. Shen and X. Xia, Adaptive finite-time consensus in multi-agent networks, Systems and Control Letters 62 (2013) 880-889. pdf

[75] H. Tazvinga, X. Xia and J. Zhang, Minimum cost solution of photovoltaic-diesel-battery hybrid power systems for remote consumers, Solar Energy 96 (2013) 292-299. pdf

[74] N. Wang, J. Zhang and X. Xia, Energy consumption of air conditioners at different temperature set points, Energy and Buildings 65 (2013) 412-418. pdf

[73] A. M. Elaiw, X. Xia and A. M. Shehata, Hybrid DE-SQP and hybrid PSO-SQP methods for solving dynamic economic emission dispatch problem with valve-point effects, Electric Power Systems Research 103 (2013) 192-200. pdf

[72] X. Zhuan and X. Xia, Development of efficient model predictive control strategy for cost-optimal operation of a water pumping station, IEEE Transactions on Control Systems Technology, Vol. 21, no. 4, July 2013, pp. 1449-1454, pdf

[71] X. Xia and J. Zhang, Mathematical description of measurement and verification of energy efficiency improvement, Applied Energy 111 (2013) 247-256. pdf

[70] Y. Li, X. Xia and Y. Shen, A high-gain-based global finite-time nonlinear observer, International Journal of Control, vol. 86, no. 5, 2013, pp. 759-767. pdf

[69] A. M. Elaiw, X. Xia and A. M. Shehata, Minimization of fuel costs and gaseous emissions of electric power generation by model predictive control, Mathematical Problems in Engineering, vol. 2013, article ID 906958, 15 pages. pdf

[68] Y. Li, Y. Shen and X. Xia, Global finite-time observers for a class of nonlinear systems, Kybernetika 49 (2013), no. 2, pp. 319-340. pdf

[67] E. Malatji, J. Zhang and X. Xia, A multiple objective optimisation model for building energy efficiency investment decision, Energy and Buildings 61 (2013) 81-87. pdf

[66] X. Zhuan and X. Xia, Optimal operation scheduling of a pumping station with multiple pumps, Applied Energy 104 (2013) 250–257. pdf

[65] X. Ye, X. Xia, J. Zhang and Y. Chen, Effects of trends and seasonalities on robustness of the Hurst parameter estimators, IET Signal Processing, 2012, Vol. 6, Iss. 9, pp. 849–856. pdf

[64] A. M. Elaiw, X. Xia and A. M. Shehata, Dynamic economic dispatch using hybrid DE-SQP for generating units with valve-point effects, Mathematical Problems in Engineering Volume 2012, Article ID 184986, 10 pages, doi:10.1155/2012/184986. pdf

[63] H. Yu and X. Xia, Adaptive consensus of multi-agents in networks with jointly connected topologies, Automatica 48 (2012) 1783-1790. pdf

[62] M. Siewe Siewe and X. Xia, Nonlinear dynamics and small damping signal control of chaos in a model of flow-induced oscillations of cylinders, Mechanics Research Communications 46 (2012) 8-14. pdf

[61] U.E. Ekpenyong, J. Zhang and X. Xia, An improved robust model for generator maintenance scheduling, Electric Power Systems Research 92 (2012) 29-36. pdf

[60] X. Xia, J. Zhang and W. Cass, Energy management of commercial buildings - A case study from a POET perspective of energy efficiency, Journal of Energy in Southern Africa, Vol 23, No 1, February 2012, 23-31. pdf

[59] H. Zhang, X. Xia and J. Zhang, Optimal sizing and operation of pumping systems to achieve energy efficiency and load shifting, Electric Power Systems Research 86 (2012) 41-50. pdf

[58] A. M. Elaiw, X. Xia and A. M. Shehata, Application of model predictive control to optimal dynamic dispatch of generation with emission limitations, Electric Power Systems Research 84 (2012) 31-44. pdf

[57] A. J. van Staden, J. Zhang and X. Xia, A model predictive control strategy for load shifting in a water pumping scheme with maximum demand charges, Applied Energy 88 (2011) 4785 – 4794. pdf

[56] X. Xia and J. Zhang, Modelling and control of heavy-haul trains, IEEE Control Systems Magazine, vol. 31, no. 4,  August 2011, 18 - 31. pdf

[55] X. Xia, J. Zhang and A. Elaiw, An application of model predictive control to the dynamic economic dispatch of power generation, Control Engineering Practice 19 (2011) 638 - 648. pdf

[54] S. Zhang and X. Xia, Modeling and energy efficiency optimization of belt conveyors, Applied Energy 88 (2011) 3061 - 3071. pdf

[53] W. Badenhorst, J. Zhang and X. Xia, Optimal hoist scheduling of a deep level mine twin rock winder system for demand side management, Electric Power Systems Research 81 (2011) 1088 - 1095. pdf

[52] Hongyu Miao, Xiaohua Xia, Alan S. Perelson and Hulin Wu, On identifiability of nonlinear ODE models and applications in viral dynamics, SIAM Review, Vol. 53, No. 1, pp. 3 - 39, 2011. pdf

[51] J. Zhang and X. Xia, A model predictive control approach to the periodic implementation of the solutions of the optimal dynamic resource allocation problem, Automatica 47 (2011) 358 - 362. pdf

[50] J. Zhang, CH. Moog, and X. Xia, Realization of multivariable nonlinear systems via the approach of differential forms and differential algebra, Kybernetika, Vol. 46 (2010), No. 5, pp. 799-830. pdf

[49] X. Xia and J. Zhang, Geometric steady states of nonlinear systems, IEEE Transactions on Automatic Control, Vol. 55, No. 6, June 2010, pp. 1448-1454. pdf

[48] X. Zhuan and X. Xia, Fault-tolerant control of heavy-haul trains, Vehicle System Dynamics, Vol. 48, No. 6, June 2010, 705–735. pdf

[47] X. Xia and A. M. Elaiw, Optimal dynamic economic dispatch of generation: A review, Electric Power Systems Research 80 (2010) 975–986. pdf

[46] S. Zhang and X. Xia, Optimal control of operation efficiency of belt conveyor systems, Applied Energy, 87 (2010) 1929–1937. pdf

[45] A.M. Elaiw and X. Xia, HIV dynamics: Analysis and robust multirate MPC-based treatment schedules, J. Math. Anal. Appl. 359 (2009) 285–301. pdf

[44] X. Zhuan, G. Zheng, and X. Xia, A modelling methodology for natural dam-river network systems, Control Engineering Practice 17 (2009) 534–540. pdf

[43] A. Middelberg, J. Zhang and X. Xia, An optimal control model for load shifting – With application in the energy management of a colliery, Applied Energy, 86 (2009) 1266- 1273. pdf

[42] Y. Shen and X. Xia, Semi-global finite-time observers for nonlinear systems, Automatica 44 (2008) 3152-3156. pdf

[41] X. Liang, J. Zhang and X. Xia, Adaptive synchronization for generalized Lorenz systems, IEEE Transactions on Automatic Control, Vol. 53, No. 7, August 2008, pp. 1740-1746. pdf

[40] X. Liang, J. Zhang and X. Xia, Improving the security of chaotic synchronization with a Delta-modulated cryptographic technique, IEEE Transactions on Circuits and Systems II, vol. 55(7), July 2008, 680-684. pdf

[39] S. Bowong and X. Xia, Robust synchronization of a class of nonlinear systems: applications to chaotic coupled electromechanical systems, Journal of Vibration and Control, 14(4): 531-551, 2008. pdf

[38] X. Xia, G. Chen, R. Gai and AS. Zinober, Periodicity in Delta-modulated feedback control, J Control Theory Appl 2008 6 (1) 37-44. pdf

[37] X. Xia and J. Zhang, Geometric characterization on the solvability of regulator equations, Automatica 44 (2008) 445-450. pdf

[36] X. Zhuan and X. Xia, Speed regulation with measured output feedback in the control of heavy haul trains, Automatica 44 (2008) 242-247. pdf

[35] X. Zhuan and X. Xia, Optimal scheduling and control of heavy haul trains equipped with electronically controlled pneumatic braking systems, IEEE Transactions on Control Systems Technology, Vol. 15, No. 6, 1159-1166, November 2007. pdf

[34] Frank Doyle, Lois Jovanovic, Dale Seborg, Robert S. Parker, B. Wayne Bequette, Annah M. Jeffrey, Xiaohua Xia, Ian K. Craig, Thomas McAvoy, A tutorial on biomedical process control, Journal of Process Control 17 (2007) 571-594. Introduction (pdf) and IV. Structured treatment interruptions: A control mathematical approach to protocol design (pdf), by Annah M. Jeffrey, Xiaohua Xia, Ian K. Craig.

[33] X. Xia, Periodic orbits arising from two-level quantized feedback control, Chaos, Solitons & Fractals, 33 (2007) 1339-1347. pdf

[32] X. Xia and G. Chen, On delta-modulated control: A simple system with complex dynamics, Chaos, Solitons & Fractals, 33 (2007) 1314-1328. pdf

[31] X. Xia, Modelling of HIV infection: Vaccine readiness, drug effectiveness and therapeutical failures, Journal of Process Control, 17 (2007) 253 - 260. pdf

[30] M. Chou and X. Xia, Optimal cruise control of heavy-haul trains equipped with electronically controlled pneumatic brake systems, Control Engineering Practice, 15 (2007) 511-519. pdf

[29] M. Chou, X. Xia and C. Kayser, Modelling and model validation of heavy-haul trains equipped with electronically controlled pneumatic brake systems, Control Engineering Practice, 15 (2007), 501-509. pdf

[28] R. Gai, X. Xia and G. Chen, Complex dynamics of systems under Delta-modulated feedback, IEEE Transactions on Automatic Control, vol. 51, no. 12, 1888-1902, December 2006. pdf

[27] R. Gai, G. Chen and X. Xia, Global dynamics of unbalanced Delta-modulated feedback-controlled discrete-time systems, Dynamics of Continuous, Discrete and Impulsive Systems Series B: Applications & Algorithms 13 (2006) 635-679. pdf

[26] X. Zhuan and X. Xia, Cruise control scheduling of heavy haul trains, IEEE Transactions on Control Systems Technology, Vol. 14, No. 4, 757-766, July 2006. pdf

[25] X. Xia and A. S. I. Zinober, Δ-modulated feedback in discretization of sliding mode control, Automatica, vol. 42 771-776, 2006. pdf

[24] J. Zhang, X. Xia, and C. H. Moog, Parameter identifiability of nonlinear systems with time-delay, IEEE Transactions on Automatic Control, vol. 51, no. 2, 371-375, February 2006. pdf

[23] X. Xia, G. Chen and R. Gai, Control Lyapunov modes of linear control systems, The Transactions of the SA Institute of Electrical Engineering, vol. 96, no. 4, December 2005, pp. 273-278. pdf

[22] AM. Jeffrey and X. Xia, Identifiability of HIV/AIDS models, in: Deterministic and Stochastic Models of AIDS and HIV with Intervention, Chapter 11, H. Wu and W. Y. Tan (Eds), World Scientific Publications, Singapore 2005. pdf (2.3M)

[21] A. M. Jeffrey, X. Xia and I. K. Craig, A viral load time response analysis to anti-retroviral therapy, The Transactions of the SA Institute of Electrical Engineering, vol. 96, no. 3, September 2005, pp. 234-239. pdf (500k)

[20] R. A. Filter, X. Xia and C. M. Gray, Dynamic HIV/AIDS parameter estimation with application to a vaccine readiness study in Southern Africa, IEEE Transactions on Biomedical Engineering, vol. 52, no. 5, May 2005, pp. 284-291. pdf

[19] C. M. Gray, C. Williamson, H. Bredell, A. Puren, X. Xia, R. Filter, L. Zijenah, H. Cao, L. Morries, E. Vardas, M. Colvin, G. Gray, J. McIntyre, R. Musonda, S. Allen, D. Katzenstein, M. Mbizo, N. Kumwenda, T. Taha, S. A. Karim, J. Flores and H. W. Sheppard, Viral dynamics and CD4+ T celll counts in subtype C human immunodeficiency virus type 1-infected individuals from Southern Africa, Aids Research and Human Retroviruses, vol. 21, no. 4, 2005, pp. 285-291. pdf

[18] I. Craig and X. Xia, Can HIV/AIDS be controlled? IEEE Control Systems Magazine, vol, 25, no. 2, 80-83, February 2005. pdf

[17] T. C. Song, L. P. Linde and X. Xia, A new WCDMA transmit power control technique, The Transactions of the SA Institute of Electrical Engineering, vol. 96, no. 1, January 2005, pp. 45-55. pdf

[16] C. Li and X. Xia, On the bound of the Lyapunov exponents for continuous systems, Chaos, vol. 14, no. 3, 557-561, September 2004. pdf

[15] X. Xia, A. S. I. Zinober, Periodic orbits from Delta-modulation of stable linear systems, IEEE Transactions on Automatic Control, vol. 49, no. 8, 1376-1380, August 2004. pdf

[14] I.K. Craig, X. Xia, and J.W. Venter, Introducing HIV/AIDS education into the electrical engineering curriculum at the University of Pretoria, IEEE Transactions on Education, vol. 47, no. 1, 65-73, February 2004. pdf

[13] X. Xia, R. Gai and G. Chen, Periodic orbits arising from Delta-modulated feedback control, Chaos, Solitons & Fractals, vol.19, 581-595, 2004 pdf

[12] X. Xia, Estimation of HIV/AIDS parameters, Automatica, 39(2003), 1983-1988. pdf

[10] M. Jeffrey, X. Xia, I.K. Craig, When to initiate HIV therapy: a control theoretic approach, IEEE Transactions on Biomedical Engineering, vol. 50, 1213-1220, 2003. pdf

[9] X. Xia, C. H. Moog, Identifiability of nonlinear systems with applications to HIV/AIDS models, IEEE Transactions on Automatic Control, vol. 48, no. 2, February, 2003, pp. 330-336. pdf

[8] R. Pothin, C. H. Moog and X. Xia, Disturbance decoupling of nonlinear MISO systems by static measurement feedback, Kybernetika, vol. 38, No.5 (2002), pp. 601-608.  pdf

[7] X. Xia, LA. Marquez, P. Zagalak and CH. Moog, Analysis of nonlinear time-delay systems using modules over non-commutative rings, Automatica, vol. 38 (2002), pp. 1549-1555. pdf

[6] X. Xia, C. H. Moog and R. Pothin, Extended output injection and output feedback i/o linearization, Electronics Letters, vol. 38, no. 4, pp. 200-202, 2002. pdf

[5] X. Xia, Well-posedness of piecewise-linear systems with multiple modes and multiple criteria, IEEE Transactions on Automatic Control, vol. AC-47, No. 10, October 2002, pp. 1716-1720. pdf

[4] X. Xia, Global frequency estimation using adaptive identifiers, IEEE Transactions on Automatic Control, vol. AC-47, No. 7, July 2002, pp.1188-1193.  pdf

[3] R. Pothin, C. H. Moog and X. Xia, Stabilization of a series DC motor by dynamic output feedback, in: Nonlinear Control in the Year 2000, vol. 2, Lecture Notes in Control and Information Sciences 259: 257-263 2001,  A. Isidori, F. Lamnabhi-Lagarrigue and W. Respondek (Eds), Springer, London.

[2] B. Guo, X. Xia, F. R. Camisani-Calzolari and I. K. Craig, A semi-discrete approach to modeling and control of the continuous casting process, Steel Research, 71(2000), 220-227. pdf

[1] X. Xia and C. H. Moog, Disturbance decoupling of nonlinear systems by output feedback, IEEE Transactions on Automatic Control, 44(1999), 1425-1429. pdf

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