Showing papers by "University of Architecture, Civil Engineering and Geodesy published in 1998"
TL;DR: In this paper, the removal of lead by sorption on granulated blast-furnace slag has been investigated as a function of pH, the metal ion concentration, the particle size and the amount of sorbent.
143 citations
21 Jun 1998
TL;DR: In this paper, the authors considered a class of uncertain large-scale systems in which interconnections between subsystems as well as uncertainties in each subsystem are described by integral quadratic constraints.
Abstract: This paper is concerned with a problem of stabilization and robust control design for interconnected uncertain systems. The new class of uncertain large-scale systems is considered in which interconnections between subsystems as well as uncertainties in each subsystem are described by integral quadratic constraints. The problem is to design a set of local (decentralized) controllers which stabilize the overall system and guarantee robust disturbance attenuation in the presence of the uncertainty in interconnections between subsystems as well as in each subsystem. The paper presents necessary and sufficient conditions for the existence of such a controller. The proposed design is based on recent absolute stabilization and minimax optimal control results and employs solutions of a set of game-type Riccati algebraic equations arising in H/sub /spl infin// control.
46 citations
TL;DR: The mechanism of phosphorus removal in SBR submerged biofilm system was studied in this article, where the DNP and nuclear magnetic resonance methods were employed to verify the mechanism of removal by bacteria with the phosphorus release in anaerobic phase and uptake in oxic and anoxic phases.
34 citations
TL;DR: In this article, a new process with nitrosofication and denitroso-fication for nitrogen removal from coal gasification wastewater is reported, where fibrous carriers were packed in an anoxic tank and an aerobic tank for the attached growth of denitrifying bacteria and Nitrobacter respectively.
10 citations
TL;DR: The sensitivity of the AAMRE relative to perturbations in its coefficients is studied in this article, where both linear local and non-linear non-local perturbation bounds are obtained.
8 citations
TL;DR: In this paper, the cross-effect of heat and mass transfer of capillary porous media was analyzed using a convective drying mathematical model under the first unsteady boundary condition.
Abstract: This paper mainly focuses on cross-effect of heat and mass transfer of capillary porous media which A.B.Luikov set up on irreversible thermodynamics principle. On the basis of perfecting the equations of heat and mass transfer, the heat and mass transfer parameters are determined during drying processes, and thermal gradient coefficient δ and moisture gradient coefficient ξ are obtained which show the cross-effect of heat and mass transfer. Thus the fundamentals are provided for quantitative analysis of cross-effect of heat and mass transfer. The convective drying mathematical model under the first unsteady boundary condition is therefore proposed. By the application of Henry transform, the theoretical solution of unsteady drying process is given and its validity is verified
7 citations
TL;DR: New concepts of fuzzy random variable-valued exponential function, logarithmic function and power function are introduced and their fundamental properties are discussed.
6 citations
TL;DR: The Zhen9an Wastewater Treatment Plant in Foshan City, Guangdong Province, China is a newly built large municipal wastewater treatment plant in south China, situated in the southeast of the famous ancient foshan city, has a treatment capacity of 100,000 m 3 /d, serves an area of 32 km 2 and 220,000 P. E., occupies 7 ha area with a total investment of 220 million RMB (about 26.5 million U.S dollar), which was put into operation in December 1995.
3 citations
TL;DR: The results confirm the expected conservatism of the microbiological structural indicators and the possibility of using the dehydrogenase activity as a reliable biological indicator for assessment and management of the nitrogen removal processes.
Abstract: The nitrification denirtification wastewater treatment processes have been studied in laboratory conditions, using a system of two completely mixed reactors and a secondary clarifier. Wastewater and activated sludge were taken from the Sofia Wastewater Treatment Plant (Sofia WWTP). Four steady states, differing in sludge age were investigated. For each steady state microbiological and biochemical analyses were carried out. The aim of the study was to establish the reliable bioindicators for assessment and management of the nitrogen removal processes. The amount of the more important physiological groups of microorganisms varies insignificantly in the four steady states, whereas the dehydrogenase activity corresponds closely to the organic substrate utilization rate in anoxic conditions. These results confirm the expected conservatism of the microbiological structural indicators, on the one hand, and the possibility of using the dehydrogenase activity as a reliable biological indicator, on the othe...
TL;DR: In this article, the out-of-plane behavior of welded I-section beam-columns with slender web was investigated and design formulas were proposed for practical application to members with web slenderness 60 to 120.
Abstract: This article, being a companion paper of Gu and Chen (1997), concerns the out-of-plane behavior (lateral-torsional buckling) of welded I-section beam-columns with slender web. Theoretical and experimental studies show that relaxing the strict limit of web slenderness in traditional I-section beam-column design is possible and efficient. Web buckling/deflection does not seriously reduce the out-of-plane bearing capacity of such beam-columns. Design formulas are proposed for practical application to members with web slenderness 60 to 120.