Search results for "berry"
showing 10 items of 159 documents
Observable geometric phase induced by a cyclically evolving dissipative process
2006
In a prevous paper (Phys. Rev. Lett. 96, 150403 (2006)) we have proposed a new way to generate an observable geometric phase on a quantum system by means of a completely incoherent phenomenon. The basic idea was to force the ground state of the system to evolve ciclically by "adiabatically" manipulating the environment with which it interacts. The specific scheme we have previously analyzed, consisting of a multilevel atom interacting with a broad-band squeezed vacuum bosonic bath whose squeezing parameters are smoothly changed in time along a closed loop, is here solved in a more direct way. This new solution emphasizes how the geometric phase on the ground state of the system is indeed du…
Computational annotation of genes differentially expressed along olive fruit development
2009
Abstract Background Olea europaea L. is a traditional tree crop of the Mediterranean basin with a worldwide economical high impact. Differently from other fruit tree species, little is known about the physiological and molecular basis of the olive fruit development and a few sequences of genes and gene products are available for olive in public databases. This study deals with the identification of large sets of differentially expressed genes in developing olive fruits and the subsequent computational annotation by means of different software. Results mRNA from fruits of the cv. Leccino sampled at three different stages [i.e., initial fruit set (stage 1), completed pit hardening (stage 2) a…
Raspberry Pi mikrodators kā mājas drošības videonovērošanas sistēma
2015
Kvalifikācijas darba laikā, izmantojot Raspberry Pi mikrodatoru un tīmekļa kameru, izstrādāta mājas drošības videonovērošanas sistēma un tīmekļa vietne, kur ērti aplūkot to, kas pašlaik notiek mājās vai apskatīt attēlus, kas ir noticis pirms tam. Lietotājs sistēmā attālināti var redzēt notiekošo gan tiešraidē, gan attēlos, kas tiek uzņemti, kad tīmekļa kamera pamana kustību tās priekšā. Sistēma izstrādāta ar tīmekļa tehnoloģiju palīdzību, izmantojot iezīmēšanas valodas HTML un CSS, programmēšanas valodu PHP, Phalcon PHP ietvaru, MySQL datu bāzes programmu un jQuery bibliotēku.
Termoregulācijas sistēmas izstrāde viedajai mājai
2019
Lietderīga un saprātīga mājas automatizācijas un mākslīgā intelekta izmantošana var pamatīgi uzlabot cilvēku dzīves līmeni un atbrīvot cilvēkus no dažādiem rutīnas darbiem. Šī bakalaura darba mērķis ir izveidot funkcionējošu termoregulācijas sistēmu viedajai mājai, kas reģistrē visas lietotāju darbības un apstākļus kādās tās veiktas, un izveidot tai piemērotu mašīnmācīšanās modeli, ko laika gaitā, kad tiks savākts pietiekams datu daudzums, apmācītu un ļautu sniegt ieteikumus par termoregulēšanu mājās. Darba rezultātā tika izveidota pilnīgi funkcionējoša termoregulācijas sistēma, ar kuras palīdzību var attālināti un ar runas vadību regulēt logus un radiatorus, kā arī pārraudzīt temperatūru d…
Innovative and Applied Research in Biology: Proceedings
2022
The collection contains SCIENTIFIC articles on the topics of the LU 80 conference reports. The main focus is on innovative and applied research in biology and interdisciplinary fields.
Microscopic theory for the light-induced anomalous Hall effect in graphene
2019
We employ a quantum Liouville equation with relaxation to model the recently observed anomalous Hall effect in graphene irradiated by an ultrafast pulse of circularly polarized light. In the weak-field regime, we demonstrate that the Hall effect originates from an asymmetric population of photocarriers in the Dirac bands. By contrast, in the strong-field regime, the system is driven into a non-equilibrium steady state that is well-described by topologically non-trivial Floquet-Bloch bands. Here, the anomalous Hall current originates from the combination of a population imbalance in these dressed bands together with a smaller anomalous velocity contribution arising from their Berry curvature…
Vacuum induced berry phase: Theory and experimental proposal
2003
We investigate quantum effects in geometric phases arising when a two-level system is interacting with a quantized electromagnetic field. When the system is adiabatically driven along a closed loop in the parameter space, signatures of the field quantization are observable in the geometric phase. We propose a feasible experiment to measure these effects in cavity QED and also analyse the semi-classical limit, recovering the usual Berry phase results.
Berry's phase in Cavity QED: proposal for observing an effect of field quantization
2002
Geometric phases are well known in classical electromagnetism and quantum mechanics since the early works of Pantcharatnam and Berry. Their origin relies on the geometric nature of state spaces and has been studied in many different systems such as spins, polarized light and atomic physics. Recent works have explored their application in interferometry and quantum computation. Earlier works suggest how to observe these phases in single quantum systems adiabatically driven by external classical devices or sources, where, by classical, we mean any system whose state does not change considerably during the interaction time: an intense magnetic field interacting with a spin 1/2, or a birefringe…
Winter feeding leads to a shifted phenology in the browntail moth Euproctis chrysorrhoea on the evergreen strawberry tree Arbutus unedo
2010
1 The browntail moth Euproctis chrysorrhoea is a highly polyphagous univoltine forest pest. Although its young larvae usually overwinter in diapause from early autumn to the beginning of spring, winter larval feeding has been reported when this species feeds on the evergreen woody shrub strawberry tree Arbutus unedo. 2 The present study investigated life-history traits of four populations of E. chrysorrhoea feeding on A. unedo, including phenology of the different life stages, larval feeding activity and diapause incidence. By modelling the relationship between larval size and host plant leaf persistence, elevation and mean annual temperature, we also studied larval development in ten popul…
Authentication of berries and berry-based food products.
2021
Abstract Berries represent one of the most important and high-valued group of modern-day health-beneficial “superfoods” whose dietary consumption has been recognized to be beneficial for human health for a long time. In addition to being delicious, berries are rich in nutrients, vitamins, and several bioactive compounds, including carotenoids, flavonoids, phenolic acids, and hydrolysable tannins. However, due to their high value, berries and berry-based products are often subject to fraudulent adulteration, commonly for economical gain, but also unintentionally due to misidentification of species. Deliberate adulteration often comprises the substitution of high-value berries with lower valu…