Search results for "photo"
showing 10 items of 11789 documents
An Economic Assessment of Micro-Scale Use of Renewable Energy Sources: Two Case Studies
2015
During recent times, renewable energy technologies have shown a relative fast growth in the global energy investment, global energy capacity and their integration within multiple sectors, particularly in the electricity sector. Renewable energy technologies have also experienced notorious declining costs on their manufacturing production. Nevertheless, while this growth is widely acknowledged, the share of renewables with respect total energy production has been moderate. Technological advancements in renewable energy have demonstrated the potential of renewables in energy generation and also that renewables can provide direct and indirect advantages over their counterparts. This thesis inv…
Roczna wydajność instalacji PV zamontowanej na dachu budynku dydaktycznego Uniwersytetu Opolskiego
2018
Celem badań była analiza i ocena sprawności pracy instalacji fotowoltaicznej zamontowanej na dachu budynku dydaktycznego Uniwersytetu Opolskiego mieszczącego się przy ul. Kominka 6 w Opolu. Zakres pracy obejmował ocenę: energetyczną - uzysku energetycznego (ilość wyprodukowanego prądu a położenie geograficzne paneli fotowoltaicznych) i ekologiczną - redukcja emisji szkodliwych substancji niewyemitowanych do aerozolu atmosferycznego z powodu produkcji prądu przez instalację PV, a niedostarczonej przez elektrownię opalaną węglem. Badania wykazały dobry wynik uzysku energetycznego w ciągu roku - 5,30 MWh energii z tego systemu oraz znaczną redukcję emisji CO2 do atmosfery - 4,27 Mg/rok, co pot…
Hydrogen plasma induced photoelectron emission from metal surfaces
2018
Low temperature hydrogen plasmas are strong sources of vacuum ultraviolet radiation. The properties of laboratory plasmas can be influenced by surface processes induced by photons with their energies exceeding the surface work function of the wall material. In this work, the plasma induced photoelectron emission has been studied with different ion sources. The emission depends on the mechanical design of the plasma device, plasma heating method and the discharge power (density). Parametric studies include the quantifying of the emission from different metal surfaces, commonly used as plasma facing materials in ion sources, as well as alkali metal covered surfaces. Experimental studies sugges…
Una vida en imágenes: los daily photo projects y la retórica del instante
2009
Los daily photo projects son una práctica contemporánea que consiste en tomar una fotografía digital diaria de sus protagonistas hasta el día de su muerte. Las imágenes son ensambladas en un video que, de este modo, concentra sus vidas en minutos. Una vida entera es visualizada como si fuera una secuencia de instantes, de instantáneas. Son alegorías de la vida que muestran el proceso de envejecimiento a modo de espejo, lanzando una nueva mirada al tópico de la vanitas y del autorretrato. El montaje en video es lo que convierte a estos proyectos en vanitas en movimiento ya que la secuencia de fotografías muestra el proceso de envejecimiento. Daily photo projects are contemporary photographic…
Measurement of dielectron production in central Pb-Pb collisions at √sNN = 2.76 TeV
2019
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. The first measurement of dielectron (e + e −) production in central (0 – 10 %) Pb – Pb collisions at √sNN=2.76TeV at the LHC is presented. The dielectron invariant-mass spectrum is compared to the expected contributions from hadron decays in the invariant-mass range 0 < mee < 3.5 GeV / c2. The ratio of data and the cocktail of hadronic contributions without vacuum ρ0 is measured in the invariant-mass range 0.15 < mee < 0.7 GeV / c2, w…
Cultural heritage in social media : Museum of Photography
2012
The research Cultural Heritage in Social Media: Museum of Photography deals with a new form of displaying and preserving cultural heritage in the 21st century by using social media tools. This paper is an analysis of a Romanian cultural heritage blog, Museum of Photography, which contains documentary photography from the end of the 19th century until 1990’s as well as other types of photographs related to the interests’ of Alex Galmeanu – the owner of Museum of Photography. The aim of this research is to demonstrate that cultural heritage exists outside the boundaries of formal institutions, namely museums, thus showing that the meaning of the word “museum” is expanding and that the public …
The ALICE experiment at the CERN LHC
2008
Journal of Instrumentation 3(08), S08002 (2008). doi:10.1088/1748-0221/3/08/S08002
Shooting borders. Per una geogafia visuale delle migrazioni
2017
Our perceptions of events in the Mediterranean are strongly influenced by a range of visual practices that impact on both the emotional and the political. In this paper, I set out to critically explore the visual geographies underlying photographic images of contemporary migration flows across the Mediterranean Sea. I argue the need for a methodological shift from a content analysis approach to a critical investigation of the spatial interweaving of images, gazes and aesthetic regimes that governs both the production and reception of such photographs. Given these theoretical premises, I focus on three images of migrants being rescued in the Mediterranean to illustrate how photography can ac…
Plasticity in Photoperiodism : Drosophila montana Females Have a Life-Long Ability to Switch From Reproduction to Diapause
2022
Photoperiodic reproductive diapause is an essential part of female life cycle in several insect species living on high latitudes, where overwintering in reproductive stage involves high risks for survival and progeny production. The sensitive period (SP), during which photoperiodic cues can trigger the switch from direct development to diapause, can last from a few hours or days after emergence to the entire life span of females. Moreover, in some species, sexually mature females can enter post-reproductive diapause as a response to decreasing day length and/or temperature. We studied the duration of SP for diapause induction and the females’ ability to enter post-reproductive diapause at s…
Negotiating the Scarred Landscape of Ulster: Post-conflict Photography in Northern Ireland
2015
International audience