Search results for "OPF"

Dracocephalum ruyschiana L. (Svētezers, Livlande)

2020

Nordischer Drachenkopf. Karl Reinhold Kupffer Anmerkung: Von Herr Raudsep erhalten als bei Heiligensee in Livland gesamellt. Ende des 19., Anfang des 20. Jahrhunderts. /// Ruiša pūķgalve. Uzraksts: no Raudsepa kunga saņemts kā pie Svētezera Livlandē ievākts. 19.gadsimta beigas, 20. gadsimta sākums. /// Northern Dragon-head. Annotation: received from Mr. Raudsepp as collected at Svētezers in Livland.Late 19th century, early 20th century. [Attēls no LU Muzeja kolekcijas Herbarium Balticum (RIG I); (BOT2791_5).]

Observation of Poincaré-Andronov-Hopf Bifurcation in Cyclotron Maser Emission from a Magnetic Plasma Trap

2018

We report the first experimental evidence of a controlled transition from the generation of periodic bursts of electromagnetic radiation into the continuous-wave regime of a cyclotron maser formed in magnetically confined nonequilibrium plasma. The kinetic cyclotron instability of the extraordinary wave of weakly inhomogeneous magnetized plasma is driven by the anisotropic electron population resulting from electron cyclotron plasma heating in a MHD-stable minimum-B open magnetic trap. peerReviewed

Optimizing droop coefficients for minimum cost operation of islanded micro-grids

2017

This paper shows how minimum cost energy management can be carried out for islanded micro-grids considering an expanded state that also includes the system's frequency. Each of the configurations outputted by the energy management system at each hour are indeed technically sound and coherent from the point of view of generation-consumption balancing by exploiting a frequency dependent load flow algorithm. A Glow-worm Swarm Optimization (GSO) algorithm carried out in a 24 hour time frame provides optimized results. A test has been carried out for a residential PV-Storage-Microturbine islanded micro-grid to show the feasibility as well as the efficiency of the proposed approach and results ar…

Blockchain tehnoloģijā balstītu sistēmu izveide ar Ethereum

2016

Darba mērķis ir Ethereum decentralizētas programmatūras platformas pētīšana. Darbā tiek pētītas tehnoloģijas uz kurām balstās decentralizētās programmatūras platforma, programmatūras izstrādes process tajā un platformas stiprās un vājās puses. Darba praktiskajā daļā, tiek izveidots decentralizētas kopfinansēšanas sistēmas prototips Ethereum platformā.

The Representation Type of the Centre of a Group Algebra

1986

Harmonicity and minimality of oriented distributions

2004

We consider an oriented distribution as a section of the corresponding Grassmann bundle and, by computing the tension of this map for conveniently chosen metrics, we obtain the conditions which the distribution must satisfy in order to be critical for the functionals related to the volume or the energy of the map. We show that the three-dimensional distribution ofS4m+3 tangent to the quaternionic Hopf fibration defines a harmonic map and a minimal immersion and we extend these results to more general situations coming from 3-Sasakian and quaternionic geometry.

The Links-Gould invariants as generalizations of the Alexander polynomial

2016

In this thesis we focus on the connections that exist between two link invariants: first the Alexander-Conway invariant ∆ that was the first polynomial link invariant to be discovered, and one of the most thoroughly studied since alongside with the Jones polynomial, and on the other hand the family of Links-Gould invariants LGn,m that are quantum link invariants derived from super Hopf algebras Uqgl(n|m). We prove a case of the De Wit-Ishii-Links conjecture: in some cases we can recover powers of the Alexander polynomial as evaluations of the Links-Gould invariants. So the LG polynomials are generalizations of the Alexander invariant. Moreover we give evidence that these invariants should s…

Topological Hopf Algebras, Quantum Groups and Deformation Quantization

2019

After a presentation of the context and a brief reminder of deformation quantization, we indicate how the introduction of natural topological vector space topologi es on Hopf algebras associated with Poisson Lie groups, Lie bialgebras and their doubles explains their dualities a nd provides a comprehensive framework. Relations with deformation quantization and applications to the deformation quantization of symmetric spaces are described.

Hopf algebras, renormalization and noncommutative geometry

1998

We explore the relation between the Hopf algebra associated to the renormalization of QFT and the Hopf algebra associated to the NCG computations of transverse index theory for foliations.

Quantum and Braided Integrals

2001

We give a pedagogical introduction to integration techniques appropriate for non-commutative spaces while presenting some new results as well. A rather detailed discussion outlines the motivation for adopting the Hopf algebra language. We then present some trace formulas for the integral on Hopf algebras and show how to treat the $\int 1=0$ case. We extend the discussion to braided Hopf algebras relying on diagrammatic techniques. The use of the general formulas is illustrated by explicitly worked out examples.