Search results for "Phaser"
showing 6 items of 6 documents
PHASER – A Phase-Shifting Antenna for Low-Power Directional Communication
2017
This paper describes the design and empirical evaluation of PHASER — a mote prototype for low-power directional communication in wireless sensor networks. PHASER has a modular design that includes three components: a low-power radio, an RF signal processing chip, and two off-the-shelf antennas. Directional communication is achieved by splitting the output signal from the low-power radio chip and controlling programmatically the phase of each signal as it transmitted to each antenna. The net effect of controlling the phase of the signals is that they generate patterns of constructive and destructive interference as signals propagate. PHASER is well-suited for wireless sensor networks as it d…
The use of low-resolution phasing followed by phase extension from 7.6 to 2.5 Å resolution with noncrystallographic symmetry to solve the structure o…
2011
P2, the major capsid protein of bacteriophage PM2, adopts the double β-barrel fold characteristic of the PRD1-adenoviral lineage. The 2.5 Å resolution X-ray data obtained by analysis of the two major lattices of a multiple crystal of P2 were phased by molecular replacement, using as a search model structure factors to 7.6 Å resolution obtained from electron density cut from the map of the entire PM2 virion. Phase extension to 2.5 Å resolution used solely sixfold cycling averaging and solvent flattening. This represents an atypical example of an oligomeric protein for which the structure has been determined at high resolution by bootstrapping from low-resolution initial phases.
HTML5 monialustaisessa pelikehityksessä : kaksiulotteiset minipelit Phaser-pelimoottorilla
2015
Mobiililaitteiden yleistyessä videopelien pelaamiseen on tarve pelien helpommalle kehitykselle ja levitykselle kasvanut. HTML5 on avoin web-standardi, joka mahdollistaa monialustaisen multimediasisällön näyttämisen suoraan Internet-selaimissa. HTML5:n avulla voikin olla mahdollista luoda pelejä, jotka eivät kärsi natiiviohjelmien tavoin yhteensopivuus- tai asennusongelmista. On kuitenkin oletettavaa, ettei HTML5 ja siihen sidoksissa olevat tekniikat tai sitä tukevat Internet-selaimet ole vielä täysin valmiita kaikkiin web-teknologian asettamiin haasteisiin, mutta sitä voitaneen kaikesta huolimatta jo käyttää täysin pelattavien ajanvietepelien toteuttamiseen. Tämä tutkielma tutkii monialusta…
Experiences with applications of macromolecular tools in supramolecular crystallography
2014
Supramolecular structures, with ever increasing size ranging from a few up to tens of nanometres, represent an intermediate stage between small molecules and biological macromolecules. Many crystal structures of these large supramolecular assemblies have been solved using dual space algorithms. However, supramolecular assemblies with a capsular shape present a particular challenge for crystallography, especially when they are chiral and composed of only light atoms. In this paper, we show that the application of “routine” macromolecular tools may be of great help in solving the crystal structures of supramolecular assemblies that are otherwise refractory to the routine methods of small mole…
HTML5 un Adobe AIR hibrīdo mobilo lietotņu izstrādes salīdzinājums
2015
Mobilo lietotņu tirgus ir plašs un ar katru nākamo gadu lietotņu skaits strauji pieaug. 2014. gadā 80% pasaules iedzīvotāju bija vismaz viens viedtālrunis. Bakalaura darbā ir veikts HTML5 un Adobe AIR hibrīdo mobilo lietotņu izstrādes platformu salīdzinājums. HTML5 izstrādes pieeja ir lietotņu izstrāde, izmantojot tīmekļa pārlūku, bet Adobe AIR izstrādes pieeja veic kompilāciju no augsta līmeņa programmēšanas valodas uz dzimtās platformas zema līmeņa valodu – bitkodu. Abas mobilo lietotņu platformas tika salīdzinātas pēc Henning Heitkötter vairākplatformu salīdzinājuma kritērijiem. Gala rezultātā tika izveidota mobilā lietotne priekš HTML5 un Adobe AIR izstrādes platformām un veikti platfor…
Nanosecond-level time synchronization of autonomous radio detector stations for extensive air showers
2016
To exploit the full potential of radio measurements of cosmic-ray air showers at MHz frequencies, a detector timing synchronization within 1 ns is needed. Large distributed radio detector arrays such as the Auger Engineering Radio Array (AERA) rely on timing via the Global Positioning System (GPS) for the synchronization of individual detector station clocks. Unfortunately, GPS timing is expected to have an accuracy no better than about 5 ns. In practice, in particular in AERA, the GPS clocks exhibit drifts on the order of tens of ns. We developed a technique to correct for the GPS drifts, and an independent method is used to cross-check that indeed we reach a nanosecond-scale timing accura…