Results 41 to 50 of about 502,181 (273)

Concerning product integrals and exponentials [PDF]

Proceedings of the American Mathematical Society, 1970
Suppose S S is a linearly ordered set, N N is the set of real numbers, G G is a function from S × S S \times S to N N , and all integrals are of the subdivision-refinement type. We show that if ∫ a b
Davis, W. P., Chatfield, J. A.
openaire   +1 more source

Enhancing robustness and precision in PMSM speed regulation via fractional-order integral sliding mode control with improved super twisting algorithm [PDF]

AIP Advances
Aiming at the permanent magnet synchronous motor’s speed regulation system that is highly sensitive to load disturbances and parameter variations, this paper proposes a fractional-order integral sliding mode control strategy based on an improved super ...
Weilai Shang, Hengqiang Wang
doaj   +1 more source

Long time deviation from exponential decay: non-integral power laws

, 2007
Quantal systems are predicted to show a change-over from exponential decay to power law decay at very long times. Although most theoretical studies predict integer power-law exponents, recent measurements by Rothe et al.
D. W. L. Sprung, G. Arfken, I. S. Gradshteyn, J. G. Muga, J. Martorell, J. R. Taylor, L. A. Khalfin, M. L. Goldberger, N. F. Mott, P. L. Knight, P. L. Knight, S. R. Wilkinson   +11 more
core   +1 more source

Probabilistic Exponential Integrators

, 2023
Probabilistic solvers provide a flexible and efficient framework for simulation, uncertainty quantification, and inference in dynamical systems. However, like standard solvers, they suffer performance penalties for certain stiff systems, where small steps are required not for reasons of numerical accuracy but for the sake of stability.
Bosch, Nathanael, Hennig, Philipp, Tronarp, Filip   +2 more
openaire   +2 more sources

EXPONENTIAL INTEGRABILITY OF STOCHASTIC CONVOLUTIONS [PDF]

Journal of the London Mathematical Society, 2003
Let \(W\) be a Wiener process in a Hilbert space (possibly cylindrical), \(U(t,s)\) be convolution operators in this space (in particular, \(U(t,s)=e^{(t-s)A}\) where \(e^{tA}\) is a \(C_0\)-semigroup). The estimate \[ E\exp\left(\lambda\sup_t\left\|\int_0^tU(t,s)\psi(s)dW(s)\right\|^2\right)\leq K \] is derived in several variants.
Seidler, Jan, Sobukawa, Takuya
openaire   +2 more sources

A Comparative View of Becker, Lomnitz, and Lambert Linear Viscoelastic Models

Mathematics
We compare the classical viscoelastic models due to Becker and Lomnitz with respect to a recent viscoelastic model based on the Lambert W function. We take advantage of this comparison to derive new analytical expressions for the relaxation spectrum in ...
Juan Luis González-Santander, Francesco Mainardi   +1 more
doaj   +1 more source

An upstream open reading frame regulates expression of the mitochondrial protein Slm35 and mitophagy flux

FEBS Letters, EarlyView.
This study reveals how the mitochondrial protein Slm35 is regulated in Saccharomyces cerevisiae. The authors identify stress‐responsive DNA elements and two upstream open reading frames (uORFs) in the 5′ untranslated region of SLM35. One uORF restricts translation, and its mutation increases Slm35 protein levels and mitophagy.
Hernán Romo‐Casanueva, Ariann E. Mendoza‐Martínez, P. Abril Medina‐Flores, Carlos Campero‐Basaldua, Alexander DeLuna, Soledad Funes   +5 more
wiley   +1 more source

Parafermionic polynomials, Selberg integrals and three-point correlation function in parafermionic Liouville field theory

, 2011
In this paper we consider parafermionic Liouville field theory. We study integral representations of three-point correlation functions and develop a method allowing us to compute them exactly.
A.V. Litvinov, Alday, Alvarez-Gaume, Aomoto, Aomoto, Argyres, Argyres, Argyres, Argyres, Argyres, Baseilhac, Belavin, Belavin, Bernevig, Bernevig, Chan, Dorn, Dorn, Dotsenko, Dotsenko, Dotsenko, Estienne, Estienne, Estienne, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Fateev, Feigin, Feigin, Feigin, Forrester, Goulian, Griffin, Hadasz, Hadasz, Iguri, Iguri, Irie, Kadell, Kastor, Koberle, Lipatov, M.A. Bershtein, Macdonald, Perelman, Poghosian, Polyakov, Polyakov, Rashkov, Read, Ribault, Selberg, Teschner, Teschner, Teschner, Tye, V.A. Fateev, Wyllard, Zamolodchikov, Zamolodchikov   +72 more
core   +1 more source

Structural instability impairs function of the UDP‐xylose synthase 1 Ile181Asn variant associated with short‐stature genetic syndrome in humans

FEBS Letters, EarlyView.
The Ile181Asn variant of human UDP‐xylose synthase (hUXS1), associated with a short‐stature genetic syndrome, has previously been reported as inactive. Our findings demonstrate that Ile181Asn‐hUXS1 retains catalytic activity similar to the wild‐type but exhibits reduced stability, a looser oligomeric state, and an increased tendency to precipitate ...
Tuo Li, Pedro A. Sánchez‐Murcia, Bernd Nidetzky   +2 more
wiley   +1 more source

The (Glg)ABCs of cyanobacteria: modelling of glycogen synthesis and functional divergence of glycogen synthases in Synechocystis sp. PCC 6803

FEBS Letters, EarlyView.
We reconstituted Synechocystis glycogen synthesis in vitro from purified enzymes and showed that two GlgA isoenzymes produce glycogen with different architectures: GlgA1 yields denser, highly branched glycogen, whereas GlgA2 synthesizes longer, less‐branched chains.
Kenric Lee, Dimitrios Bekiari, Sofia Doello, Karl Forchhammer   +3 more
wiley   +1 more source