Results 1 to 10 of about 616 (115)
Using Platelet-Rich Fibrin to Remove Graphite Tattoos May Yield Excellent Long-Term Result [PDF]
Case Reports in DentistryGraphite tattoos are rarely reported because they are mainly caused by an accidental injury or habits during childhood that cause a pencil to penetrate the oral mucosa.
Young Joon Cho +3 more
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Journal of Automation and Intelligence, 2023 In this paper we address the issue of output-feedback robust control for a class of feedforward nonlinear systems. Essentially different from the related literature, the feedback/input signals are corrupted by additive noises and can only be transmitted ...
Hefu Ye +2 more
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Miscellaneous equalities for idempotent matrices with applications
Open Mathematics, 2020 This article brings together miscellaneous formulas and facts on matrix expressions that are composed by idempotent matrices in one place with cogent introduction and references for further study.
Tian Yongge
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Matrix pencils and entanglement classification [PDF]
Journal of Mathematical Physics, 2010 Quantum entanglement plays a central role in quantum information processing. A main objective of the theory is to classify different types of entanglement according to their interconvertibility through manipulations that do not require additional entanglement to perform.
Chitambar, Eric +2 more
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Hilbert’s 17th problem in free skew fields
Forum of Mathematics, Sigma, 2020 This paper solves the rational noncommutative analogue of Hilbert’s 17th problem: if a noncommutative rational function is positive semidefinite on all tuples of Hermitian matrices in its domain, then it is a sum of Hermitian squares of noncommutative ...
Jurij Volčič
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$D$-Stratification and Hierarchy Graphs of the Space of Order 2 and 3 Matrix Pencils
Universal Journal of Mathematics and Applications, 2019 Small changes in the entries of a matrix pencil may lead to important changes in its Kronecker normal form. Studies about the effect of small perturbations have been made when considering the stratification associated with the strict equivalence between ...
Maria İsabel Garcia-planas +1 more
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Generalized trace pseudo-spectrum of matrix pencils
Cubo, 2019 The objective of the study was to investigate a new notion of generalized trace pseudo-spectrum for an matrix pencils. In particular, we prove many new interesting properties of the generalized trace pseudo-spectrum.
Aymen Ammar +2 more
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Positivity and Asymptotic Stability of Descriptor Linear Systems with Regular Pencils
Archives of Control Sciences, 2014 The positivity and asymptotic stability of the descriptor linear continuous-time and discrete-time systems with regular pencils are addressed. Necessary and sufficient conditions for the positivity and asymptotic stability of the systems are established ...
Kaczorek Tadeusz
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Definitizable hermitian matrix pencils
Aequationes Mathematicae, 1992 The paper presents three characterizations of strongly definitizable pencils, which generalize the classical results for definite pencils. They are in particular stably simultaneously diagonable. Also this form of stability is discussed with respect to an open subset of the real line. Implications for some quadratic eigenvalue problems are included.
LANCASTER, P., Ye, Qiang
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Archives of Control Sciences, 2014 A new method is proposed of design of regular positive and asymptotically stable descriptor systems by the use of state-feedbacks for descriptor continuous-time linear systems with singular pencils.
Kaczorek Tadeusz
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