1,721,057 research outputs found
A Dual Nash Game Approach to Discrete-Time H2/H∞ Filtering
No full textThe H2/H∞ filtering problem for discrete-time systems is formulated using a Nash game approach and solved by using duality with the H2/H∞ control problem
Asymptotic variance of subspace methods by data orthogonalization andmodel decoupling: a comparative analysis
No full textThis is a companion of the paper Chiuso and Picci (2004d) where we do asymptotic error analysis of a weighted PI-MOESP type method and compare accuracy with respect to estimates obtained by customary “joint” subspace methods. The analysis shows that, under certain conditions, methods based on orthogonal decomposition of the input–output data and block-decoupled parametrization perform better than traditional joint-model based methods in the circumstance of nearly parallel regressors
Mixed H2/Hinfty Control: The Discrete-Time Case
No full textA stochastic H∞ and a mixed, stochastic, H2 /H∞ control problem for discrete-time systems are considered and solved. Conditions for existence of a solution are derived, based on the solvability of an equivalent minimax problem. In this framework, it is possible to consider at the same time both stochastic and deterministic disturbances highlighting their mutual effects. The controller can be designed by solving a system of three coupled Riccati equations. Such equations display how the H2-type minimization problem and the H∞ - type constraint influence each other
Mixed control: the discrete-time case
No full textA stochastic H∞ and a mixed stochastic H2/H∞ control problem for discrete-time systems are considered and solved. Conditions for existence of a solution are derived, based on the solvability of an equivalent minimax problem. In this framework, it is possible to consider at the same time both stochastic and deterministic disturbances highlighting their mutual e4ects. The controller can be designed by solving a system of three coupled Riccati equations. Such equations display how the H2-type minimization problem and the H∞-type constraint influence each other
Representation and Factorization of Discrete-Time Rational All-Pass Functions (vol 62, pg 3262, 2017)
No full textThis article answers a system-theoretic conjecture proposed by Ferrante and Picci (2017). A counterexample to such conjecture is presented along with a modification of the statement, which preserves the essence of the result and is proven to be true
Gaseous nitrogen losses from fertilized soil during nitrification and denitrification using the acetylene blockage technique. Biol. Fert. Soil 2: 65-70
No full textA sandy soil amended with different forms and amounts of fertilizer nitrogen (urea, ammonium sulphate and potassium nitrate) was investigated in model experiments for N2O emission, which may be evolved during both oxidation of ammonia to nitrate and anaerobic respiration of nitrate. Since C2H2 inhibits both nitrification and the reduction of N2O to N2 during denitrification, the amount of N2O evolved in the presence and absence of C2H2 represents the nitrogen released through nitrification and denitrification
Ion Channels and Transporters as Therapeutic Agents: From Biomolecules to Supramolecular Medicinal Chemistry
Full text linkIon channels and transporters typically consist of biomolecules that play key roles in a
large variety of physiological and pathological processes. Traditional therapies include many ionchannel blockers, and some activators, although the exact biochemical pathways and mechanisms
that regulate ion homeostasis are yet to be fully elucidated. An emerging area of research with great
innovative potential in biomedicine pertains the design and development of synthetic ion channels
and transporters, which may provide unexplored therapeutic opportunities. However, most studies
in this challenging and multidisciplinary area are still at a fundamental level. In this review, we
discuss the progress that has been made over the last five years on ion channels and transporters,
touching upon biomolecules and synthetic supramolecules that are relevant to biological use. We
conclude with the identification of therapeutic opportunities for future exploratio
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