Search results for " frequency"
showing 10 items of 1398 documents
Timing the US Stock Market Using Moving Averages and Momentum Rules: An Extensive Study
2017
Master's thesis Business Administration BE501 - University of Agder 2017 In this thesis we investigate the performance of moving average and momentum strategies by simulating returns, both in-sample and out-of-sample, while simultaneously taking into account important market frictions. We do so for two stock indices and four stock portfolios, at daily and monthly frequency, in the period from 1928 to 2015. This is carried out in order to examine if the active strategies outperform the passive benchmark on a risk-adjusted basis, and to see if the trading rules pro table when tested in-sample also are pro table out-of-sample. In addition, and for the rst time, we examine the relevance of data…
Image Processing and Measurement of the Bubble Properties in a Bubbling Fluidized Bed Reactor
2022
The efficiency of a fluidized bed reactor depends on the bed fluid dynamic behavior, which is significantly influenced by the bubble properties. This work investigates the bubble properties of a bubbling fluidized bed reactor using computational particle fluid dynamic (CPFD) simulations and electrical capacitance tomography (ECT) measurements. The two-dimensional images (along the reactor horizontal and vertical planes) of the fluidized bed are obtained from the CPFD simulations at different operating conditions. The CPFD model was developed in a commercial CPFD software Barracuda Virtual Reactor 20.0.1. The bubble behavior and bed fluidization behavior are characterized form the bubble pro…
Radiofrekvences identifikācijas izmantošana laika izsekošanai sporta sacensībās
2016
Diplomdarbā tiek analizētas pasīvo RFID etiķešu izmaksu samazinājuma potenciāls kā iespēja biznesa veidošanai. Specifiski, lai skriešanas sacensību “Stirnu Buks” organizatoram varētu piedāvātu izdevīgāku laika izsekošanas tehnoloģiju par pašreizējo ārpakalpojuma sniedzēju - SPORTident. Darba rezultātā tiek secināts, ka ir iespējams piedāvāt pasīvo laika izsekošanas sistēmu lētāk par pašreizējo konkurentu un gūt sākotnēji plānoto peļņu. Tajā pašā laikā atšķirība no konkurenta piedāvātās cenas ir pietiekoši neliela, lai apšaubītu klienta vēlmi mainīt pakalpojuma sniedzēju. Piedāvātā pakalpojuma cenas samazināšana gadījumā mērķa peļņa netiek sasniegta un tiek secināts, ka tādā gadījumā piegādā…
Ar dabas aizsardzību saistīto terminu lietojums uzņēmumu mājas lapu tekstos
2021
Uzņēmumi savās mājas lapās var izmantot ar dabas aizsardzību (DA) saistītus terminus, lai sabiedrība tos uztvertu noteiktā veidā. Šī bakalaura darba mērķis ir analizēt DA terminu lietojumu desmit izvēlētu uzņēmumu mājas lapu tekstos, kas ņemti no piecām dažādām nozarēm. Galvenās pētījuma metodes ir literatūras apskats, absolūtā biežuma analīze un diskursa analīze. Dati parāda, ka automašīnu ražotāji savās mājaslapās izmanto visvairāk DA terminu, savukārt apģērbu firmas izmanto vismazāk DA terminu. Lielākā daļa atrasto DA terminu ir lietvārdi. Tiek secināts, ka uzņēmumus, kas savās mājaslapās lielākoties izmanto DA terminus no „vides risinājumu” kategorijas, var uztvert kā dabai draudzīgākus…
Darbības vārda biežums un gramatiskās formas-spriedzi veicinoši rīki Stīvena Kinga darbā "Kallas vilki"
2015
Pētījums aplūko darbības vārda biežuma un gramatisko formu mijiedarbību ar spriedzes kā stilistikas elementu Stīvena Kinga darbā “Kallas vilki”. Spriedze ir emociju kopums, ko raksturo pastiprinātas šaubu, neziņas, neskrības izraisītas gaidas uzzināt ar pagātnes vai nākotnes notikumiem, kam piešķirta ievērojama nozīme sižeta attīstības gaitā, saistītas detaļas. Pētījuma mērķis ir noteikt un analizēt darbības vārda biežumu un gramatiskās formas, kas izraisa vai veicina spriedzi daiļliteratūrā. Praktiskajā daļā pielietota kvantitatīvā pētīšanas metode, kas sevī ietver korpusa analīzi, izmantojot mašinizētu meklēšanas rīku, kā arī pielietojot ātrlasīšanu un krāsu kodēšanu gadījumos, kad darbīb…
Nowcasting Global Economic Growth: A Factor-Augmented Mixed-Frequency Approach
2014
Facing several economic and financial uncertainties, assessing accurately global economic conditions is a great challenge for economists. The International Monetary Fund proposes within its periodic World Economic Outlook report a measure of the global GDP annual growth, that is often considered as the benchmark nowcast by macroeconomists. In this paper, we put forward an alternative approach to provide monthly nowcasts of the annual global growth rate. Our approach builds on a Factor-Augmented MIxed DAta Sampling (FA-MIDAS) model that enables (i) to account for a large monthly database including various countries and sectors of the global economy and (ii) to nowcast a low-frequency macroec…
Short communication: casein haplotype variability in sicilian dairy goat breeds.
2008
In the Mediterranean region, goat milk production is an important economic activity. In the present study, 4 casein genes were genotyped in 5 Sicilian goat breeds to 1) identify casein haplotypes present in the Argentata dell'Etna, Girgentana, Messinese, Derivata di Siria, and Maltese goat breeds; and 2) describe the structure of the Sicilian goat breeds based on casein haplotypes and allele frequencies. In a sample of 540 dairy goats, 67 different haplotypes with frequency >or=0.01 and 27 with frequency >or=0.03 were observed. The most common CSN1S1-CSN2-CSN1S2-CSN3 haplotype for Derivata di Siria and Maltese was FCFB (0.17 and 0.22, respectively), whereas for Argentata dell'Etna, Girgenta…
On Bifurcation Analysis of Implicitly Given Functionals in the Theory of Elastic Stability
2015
In this paper, we analyze the stability and bifurcation of elastic systems using a general scheme developed for problems with implicitly given functionals. An asymptotic property for the behaviour of the natural frequency curves in the small vicinity of each bifurcation point is obtained for the considered class of systems. Two examples are given. First is the stability analysis of an axially moving elastic panel, with no external applied tension, performing transverse vibrations. The second is the free vibration problem of a stationary compressed panel. The approach is applicable to a class of problems in mechanics, for example in elasticity, aeroelasticity and axially moving materials (su…
Hybrid VLC/WiFi Architectures with Priority Feedback Channels
2022
In this paper, we consider integrating Visible Light Communication (VLC) and WiFi technologies in an ultra-dense (massive) Internet of Things scenario, where WiFi links are used for complementing VLC links and vice-versa. Indeed, in case of mobility and/or bidirectional communications, limited coverage areas and self-generated interference can be an issue. We consider hybrid VLC/WiFi nodes where the VLC link is used for the majority of (data) traffic and the WiFi link is employed as a feedback channel (e.g. transmitting TCP ACKs). In presence of intense WiFi traffic, the WiFi network may be congested and thus, to fully exploit the VLC bandwidth, we discuss possible priority mechanisms to fu…
Visual performance with multifocal intraocular lenses
2004
Abstract Objective To evaluate distance and near visual performance under bright (photopic) and dim (mesopic) conditions in patients who had undergone uncomplicated cataract extraction with multifocal or monofocal intraocular lens (IOL) implantation. Design Prospective, nonrandomized, masked, comparative, observational case series. Participants Thirty-two eyes of 32 patients after zonal-progressive multifocal IOL implantation (Allergan Medical Optics Array SA-40N) and 32 eyes of 32 age-matched patients after monofocal IOL implantation (Allergan Medical Optics SI-40NB). Intervention All eyes underwent phacoemulsification and IOL implantation. Main outcome measures At 18 months after surgery,…