Search results for "Stack"
showing 10 items of 392 documents
OpenStack instalācijas mehānismu salīdzinājums un ieviešana
2021
Bakalaura darbā “OpenStack instalācijas mehānismu salīdzinājums un ieviešana” tiek apskatīti dažādi atvērtā pirmkoda risinājumi OpenStack instalācijas veikšanai. Tēma ir aktuāla, jo var novērot, ka mākoņpakalpojumu lietošana kļūst aizvien populārāka, un OpenStack ir neatņemama mākoņu tehnoloģiju daļa. Izvēlēta detalizētāka oficiālo OpenStack instalācijas mehānismu izpēte, jo tie ir visbiežāk sastopamie un ir brīvi pieejami. Šī darba mērķis ir izpētīt OpenStack instalācijas mehānisma izvēles kritērijus, to uzbūvi un lietošanas īpatnības, izdarot secinājumus, kādos gadījumos būtu ieteicams izvēlēties attiecīgos risinājumus.
Datortīklu mācību platformas pārveide
2021
Šis dokuments ir bakalaura darbs, kurš izstrādāts Latvijas Universitātes Datorikas fakultātes Datorzinātnes studiju programmas ietvaros. Dokumentā tiek veikti pētījumi par datortīklu un datorsistēmu mācību platformas ReSeLa pārveidi, kas iekļauj izpēti par populāru tiešsaistes mācību platformu iezīmēm un veicamo uzlabojumu tehnoloģiskajiem risinājumiem. Balstoties uz veiktajiem pētījumiem, tiek veikta sākotnējā jaunās platformas izstrāde, un dokumentā aprakstīta tās struktūra, API, izvēlētie risinājumi, trūkumi un nepieciešamie uzlabojumi, kā arī tiek aprakstīta un uzstādīta testa vide tās galvenajai ārējai saskarnei – OpenStack.
Optimization of net power density in Reverse Electrodialysis
2019
Abstract Reverse Electrodialysis (RED) extracts electrical energy from the salinity difference between two solutions using selective ion exchange membranes. In RED, conditions yielding a large net power density (NPD) are generally desired, due to the still large cost of the membranes. NPD depends on a large number of physical and geometric parameters. Some of these, for example the inlet concentrations of concentrate and diluate, can be regarded as “scenario” variables, imposed by external constraints (e.g., availability) or chosen by different criteria than NPD maximization. Others, namely the thicknesses HCONC, HDIL and the velocities UCONC, UDIL in the concentrate and diluate channels, c…
Endogenous R&D Symmetry in Linear Duopoly with One-way Spillovers
2005
A duopoly model of cost reducing R&D-Cournot market competition is extended to encompass endogenous timing of R&D investments. Under the assumption that R&D spillovers are zero under simultaneous choices of R&D and only flow from the R&D leader to the follower under sequential choices, sequential and simultaneous play at the R&D stage are compared in order to assess the role of technological externalities in stimulating or attenuating endogenous firm asymmetry. The only timing structure of the R&D stage sustainable as subgame–perfect Nash equilibrium involves simultaneous play and thus zero spillovers.
A new suggested class of organic tubular structures
2004
A DFT study has been performed on monomers and dimers of new cyclic structures, cyclodioxabislactams, which are expected to bring about tubular structures through a stacking process settled by hydrogen-bonding between antiparallel peptidic groups. Different stacking modes have been found with significant effects on the energetics of the assembling process.
Imprinting the complex dielectric permittivity of liquids into the spintronic terahertz emission
2021
We report an approach in time-domain terahertz (THz) spectroscopy for measuring the dielectric response of liquids based on inherent properties of spintronic THz emitters (STEs). The THz electric field radiated from the STE is inversely proportional to the sum of the complex refractive indices of the media surrounding the thin metallic stack of the STE and the stack's conductivity. We demonstrate that by bringing a liquid in contact with the emitter, its complex refractive index and accordingly its dielectric response are imprinted into the radiated electromagnetic field from the emitter. We use water as the test liquid and ascertain its dielectric loss and permittivity in the range of ∼0.…
Structural modulations and phase transitions in β-eucryptite: an in-situ TEM study
1999
Beta-eucryptite as grown by the flux method has been investigated by in-situ cold- and hot-stage transmission electron microscopy (TEM). Using electron diffraction and dark-field TEM imaging, we found no evidence for the merohedral twinning that accompanies structural collapse at the β-to-α-quartz transition, suggesting a true hexagonal symmetry for the aluminosilicate framework of β-eucryptite. Selected-area electron diffraction (SAED) patterns exhibited a variety of incommensurate structures along the three a axes with an average modulation period of about 6.5 a. These modulated structures arise from superperiodic stacking parallel to (100) of two structural units with different Li config…
Unprecedented pressure-driven metallization and topological charge transport in an anion radical salt
2021
Abstract The hybrid inorganic/organic closed π -stacking and soft lattice of a copper anion radial (Copper-7,7,8,8-tetracyanoquinodimethane) renders its electrical conductivity and structural modifications, which are susceptible to temperature and pressure. The geometry of its metal-ligand construction contemplates the concept of topology with a charge-transfer instability. A pressure-induced ionic-neutral phase transition occurs and accompanies an anomalously large electrical conductivity, carries topological charges, and possesses a low energy gap smaller than the Coulomb gap. X-ray absorption spectroscopy of the metal establishes the high electrical conduction by the topological charges.…
Anisotropic photoluminescence of nonpolar ZnO epilayers and ZnO/Zn1 −xMgxO multiple quantum wells grown on LiGaO2 substrate
2020
Ministry of Science and Technology, Taiwan (104-2221-E-110-012-MY3, 107-2221-E-110-004-MY3); National Natural Science Foundation of China (51602309, U1605245).
Optical characterization of Mg-doped GaN films grown by metalorganic chemical vapor phase deposition
2000
Scanning electron microscopy, micro-Raman, and photoluminescence (PL) measurements are reported for Mg-doped GaN films grown on (0001) sapphire substrates by low-pressure metalorganic chemical vapor phase deposition. The surface morphology, structural, and optical properties of GaN samples with Mg concentrations ranging from 1019 to 1021 cm−3 have been studied. In the scanning micrographs large triangular pyramids are observed, probably due to stacking fault formation and three-dimensional growth. The density and size of these structures increase with the amount of magnesium incorporated in the samples. In the photoluminescence spectra, intense lines were found at 3.36 and 3.31 eV on the tr…