Search results for "recte"
showing 10 items of 463 documents
Aktivitātes tālmācības vidusskolas 10. klases angļu valodas stundās pašvadītas mācīšanās pilnveidošanai
2021
Darba autore nesen sāka strādāt par angļu valodas skolotāju tālmācības vidusskolā. Pētījuma mērķis bija pielietot praksē uzdevumus, kas pilnveidotu pašvadītas mācīšanās prasmes tālmācības skolas 10. klases angļu valodas stundās. Pētījuma bāze bija 49 tālmācības skolēni, kuriem bija jāveic ikmēneša uzdevumos iestrādāts pašvērtējums un atgriezeniskā saite, attiecīgi tika veikta kvalitatīva datu vākšana un analīze. Tika apzināts, kādas pašvadītas mācīšanās prasmes audzēkņi ir apguvuši un kādi izaicinājumi joprojām pastāv. Rezultātā tika ieskicētas turpmāk veicamās aktivitātes pašvadītas mācīšanās sekmēšanai. Pētījuma atziņas var izmantot skolotāji, kuri saskaras ar tiešsaistes mācību izaicināj…
Spēļošana pašvadītu mācīšanās prasmju attīstībai 5. Klases skolēniem angļu valodas stundās
2022
Diplomdarba mērķis ir izpētīt, kādi spēļošanas elementi var palīdzēt attīstīt skolēnu pašvadītas mācīšanās prasmes 5. klases angļu valodas stundās, jo pašvadītas mācīšanās prasmes ir nozīmīgas skolēnu turpmākajai dzīvei. Turklāt iepriekšējā pētījumā autore atklāja, ka spēļošana ir efektīvs līdzeklis, lai saglabātu skolēnu interesi un motivāciju. Kā pētījuma metode tika izvēlēta gadījuma izpēte. Datu vākšanas metodes ietvēra anketu, autores pašnovērtējumu un angļu valodas stundu refleksijas, kā arī skolēnu atsauksmes. Attiecīgi tika konstatēts, ka skolēniem varētu trūkt konkrētas prasmes, kas veido pašvadītu mācīšanos. Tā kā katra skolēna mācīšanās vajadzības un vēlmes var atšķirties, skolot…
Percolation and Schramm–Loewner evolution in the 2D random-field Ising model
2011
Abstract The presence of random fields is well known to destroy ferromagnetic order in Ising systems in two dimensions. When the system is placed in a sufficiently strong external field, however, the size of clusters of like spins diverges. There is evidence that this percolation transition is in the universality class of standard site percolation. It has been claimed that, for small disorder, a similar percolation phenomenon also occurs in zero external field. Using exact algorithms, we study ground states of large samples and find little evidence for a transition at zero external field. Nevertheless, for sufficiently small random-field strengths, there is an extended region of the phase d…
Genetic and biochemical characterization by random and site-directed mutagenesis, repressors involved in stress response phenolic acids in Bacillus s…
2009
The aim of this work was to characterize the genetic and biochemical mechanisms involved in the PASR, the phenolic acid stress response induced by phenolic acids Bacillus subtilis. By genetics and molecular biology strategies, like reverse genetic, PCR or transposon random mutagenesis, gene deletion, complementation of strains, and gene expression, the main components of the PASR were identified and quantified. Site-directed and random mutagenesis of respectively the promoter of padC encoding the phenolic acid decaroxylase, and PadR, the repressor of the padC expression, allowed us to identify the site of binding of PadR with this promoter, as well as the amino-acid residues involved in the…
Nonlinear photon-assisted tunneling transport in optical gap antennas.
2014
International audience; We introduce strongly coupled optical gap antennas to interface optical radiation with current-carrying electrons at the nanoscale. The transducer relies on the nonlinear optical and electrical properties of an optical gap antenna operating in the tunneling regime. We discuss the underlying physical mechanisms controlling the conversion involving d-band electrons and demonstrate that a simple two-wire optical antenna can provide advanced optoelectronic functionalities beyond tailoring the electromagnetic response of a single emitter. Interfacing an electronic command layer with a nanoscale optical device may thus be facilitated by the optical rectennas discussed here.
Single amino acids in the lumenal loop domain influence the stability of the major light-harvesting chlorophyll a/b complex.
2004
The major light-harvesting complex of photosystem II (LHCIIb) is one of the most abundant integral membrane proteins. It greatly enhances the efficiency of photosynthesis in green plants by binding a large number of accessory pigments that absorb light energy and conduct it toward the photosynthetic reaction centers. Most of these pigments are associated with the three transmembrane and one amphiphilic alpha helices of the protein. Less is known about the significance of the loop domains connecting the alpha helices for pigment binding. Therefore, we randomly exchanged single amino acids in the lumenal loop domain of the bacterially expressed apoprotein Lhcb1 and then reconstituted the muta…
A two-dimensional hydrodynamic code for astrophysical flows
1990
We present a two-dimensional hydrodynamic code suited to study astrophysical flows in many different environments. The code solves the hydrodynamic equations in conservative form in the most used coordinate systems and is based on an explicitfully two-dimensional flux corrected transport (FCT) technique, which ensures an accurate description of steep gradient regions and shocks, a relatively ample flexibility to include a variety of physical effects, and a good efficiency for speed on vector or array processors. Extensive testing has allowed an accurate «tuning» of the FCT numerical parameters. This code is among the best FCT codes and performs well in a whole set of demanding strongly nonl…
Dynamic percolation transition induced by phase separation: A Monte Carlo analysis
1987
The percolation transition of geometric clusters in the three-dimensional, simple cubic, nearest neighbor Ising lattice gas model is investigated in the temperature and concentration region inside the coexistence curve. We consider “quenching experiments,” where the system starts from an initially completely random configuration (corresponding to equilibrium at infinite temperature), letting the system evolve at the considered temperature according to the Kawasaki “spinexchange” dynamics. Analyzing the distributionnl(t) of clusters of sizel at timet, we find that after a time of the order of about 100 Monte Carlo steps per site a percolation transition occurs at a concentration distinctly l…
Dynamical coexistence in moderately polydisperse hard-sphere glasses
2020
We perform extensive numerical simulations of a paradigmatic model glass former, the hard-sphere fluid with 10% polydispersity. We sample from the ensemble of trajectories with fixed observation time, whereby single trajectories are generated by event-driven molecular dynamics. We show that these trajectories can be characterized in terms of the local structure, and we find a dynamical-structural (active-inactive) phase transition between two dynamical phases: one dominated by liquidlike trajectories with a low degree of local order and one dominated by glassylike trajectories with a high degree of local order. We show that both phases coexist and are separated by a spatiotemporal interface…
Simulation of surface-controlled phase separation in slit pores: Diffusive Ginzburg-Landau kinetics versus Molecular Dynamics
2008
The phase separation kinetics of binary fluids in constrained geometry is a challenge for computer simulation, since nontrivial structure formation occurs extending from the atomic scale up to mesoscopic scales, and a very large range of time needs to be considered. One line of attack to this problem is to try nevertheless standard Molecular Dynamics (MD), another approach is to coarse-grain the model to apply a time-dependent nonlinear Ginzburg–Landau equation that is numerically integrated. For a symmetric binary mixture confined between two parallel walls that prefer one species, both approaches are applied and compared to each other. There occurs a nontrivial interplay between the forma…