Search results for "TG"
showing 10 items of 2275 documents
Formatīvās vērtēšanas paņēmieni ķīmijā pamatskolā
2016
Formatīvās vērtēšanas paņēmieni ķīmijā pamatskolā. Darba autore Tālberga M., darba vadītāja Mg. ķīm. Gaile I. Bakalaura darbs, 44 lappuses, 26 attēli, 3 tabulas, 23 literatūras avoti, 14 pielikumi. Latviešu valodā. Darba mērķis ir izpētīt formatīvās vērtēšanas pieejas, lai uzlabotu skolēnu mācīšanās procesu. Darbā ir literatūras un avotu apskats par vērtēšanu, formatīvo vērtēšanu un formatīvās vērtēšanas pieeju izvēli pamatskolā. Darba pētnieciskajā daļā izstrādātas un aprobētas mācību stundas tematā „Gaiss un tā kvalitāte’’. Veikta stundu analīze. Izstrādāts un aprobēts noslēguma darbs. Veikta skolēnu anketēšana, lai noskaidrotu viedokli par mācību procesu ķīmijas priekšmetā, tematā „Gaiss…
Jelgavas Zinātniskās bibliotēkas ārējās komunikācijas izpēte un pilnveide
2016
Nepieciešamība pēc efektīvas ārējās komunikācijas publisko bibliotēku pakalpojumu popularizēšanā pieaug. Bibliotēkām jāpievēršas veiksmīgas komunikācijas veidošanā, lai tās būtu konkurētspējīgas un saglabātu savu vērtību mūsdienu mainīgajā sabiedrībā. Pētījuma mērķis ir izpētīt Jelgavas Zinātniskās bibliotēkas ārējo komunikāciju un izvirzīt ieteikumus tās pilnveidei, balstoties uz bibliotēkas lietotāju, nelietotāju un ekspertu viedokļiem. Pētījuma teorētisko bāzi veido pragmatisms, Gruniga un Hanta četri sabiedrisko attiecību modeļi un Ekoloģiskais komunikācijas procesa modelis. Darbā izmantotās datu ieguves metodes – anketēšana, mediju monitorings un ekspertu intervijas. Pēc pētījuma rezul…
Atgādinājumu funkcionalitātes izstrāde dokumentu vadības sistēmā FIBU
2016
FIBU Lietvedība ir informācijas sistēma dokumentu reģistrēšanai, virzībai un apstrādei, ko izmantopašvaldības, kā arī to pakļautās iestādes. Mans uzdevums bija esošajai sistēmai pievienot 'Atgādinājumu funkcionalitāti’, kas ļautu lietotājiem uzstādīt atgādinājumus priekš izvēlētiem dokumentiem. Galvenais uzdevums, izstrādājot darbu, bija izveidot atgādinājuma moduli, kurā, ievadot atgādinājumā tekstu un datumu, ir iespēja uzstādīt atgādinājumu dokumentam.
Investigation of the mixing layer height derived from ceilometer measurements in the Kathmandu Valley and implications for local air quality
2017
Abstract. In this study 1 year of ceilometer measurements taken in the Kathmandu Valley, Nepal, in the framework of the SusKat project (A Sustainable Atmosphere for the Kathmandu Valley) were analysed to investigate the diurnal variation of the mixing layer height (MLH) and its dependency on the meteorological conditions. In addition, the impact of the MLH on the temporal variation and the magnitude of the measured black carbon concentrations are analysed for each season. Based on the assumption that black carbon aerosols are vertically well mixed within the mixing layer and the finding that the mixing layer varies only little during night time and morning hours, black carbon emission fluxe…
General overview: European Integrated project on Aerosol Cloud Climate and Air Quality interactions (EUCAARI)-integrating aerosol research from nano …
2011
In this paper we describe and summarize the main achievements of the European Aerosol Cloud Climate and Air Quality Interactions project (EUCAARI). EUCAARI started on 1 January 2007 and ended on 31 December 2010 leaving a rich legacy including: (a) a comprehensive database with a year of observations of the physical, chemical and optical properties of aerosol particles over Europe, (b) comprehensive aerosol measurements in four developing countries, (c) a database of airborne measurements of aerosols and clouds over Europe during May 2008, (d) comprehensive modeling tools to study aerosol processes fron nano to global scale and their effects on climate and air quality. In addition a new Pan…
Radio emissions from double RHESSI TGFs
2016
Abstract A detailed analysis of Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) terrestrial gamma ray flashes (TGFs) is performed in association with World Wide Lightning Location Network (WWLLN) sources and very low frequency (VLF) sferics recorded at Duke University. RHESSI clock offset is evaluated and found to experience changes on the 5 August 2005 and 21 October 2013, based on the analysis of TGF‐WWLLN matches. The clock offsets were found for all three periods of observations with standard deviations less than 100 μs. This result opens the possibility for the precise comparative analyses of RHESSI TGFs with the other types of data (WWLLN, radio measurements, etc.) In ca…
Recent changes in precipitation, ITCZ convection and northern tropical circulation over North Africa (1979-2007)
2011
This article focuses on some recent changes observed in the Tropics with special emphasis on the African monsoon region using high-resolution gridded precipitation from the Climatic Research Unit (period 1979–2002), outgoing longwave radiation at the top of the atmosphere from the National Oceanic and Atmospheric Administration and atmospheric reanalyses from the Climate Prediction Center (NCEP-DOE2, period 1979–2007). The results show a rainfall increase in North Africa since the mid-90s with significant northward migrations of rainfall amounts, i.e. + 1.5° for the 400 mm July to September isohyets, whereas deep convection has significantly increased and shifted northward. The subsidence b…
On the angular variation of thermal infrared emissivity of inorganic soils
2012
[1] Land surface temperature (LST), a key parameter for many environmental studies, can be most readily estimated by using thermal infrared (TIR) sensors onboard satellites. Accurate LST are contingent upon simultaneously accurate estimates of land surface emissivity (e), which depend on sensor viewing angle and the anisotropy of optical and structural properties of surfaces. In the case of inorganic bare soils (IBS), there are still few data that quantify emissivity angular effects. The present work deals with the angular variation of TIR emissivity for twelve IBS types, representative of nine of the twelve soil textures found on Earth according to United States Department of Agriculture c…
A typology for intraseasonal oscillations
2013
This descriptive study attempts to document the diversity of intraseasonal oscillations (ISO) propagative and spatial patterns, as inferred from outgoing longwave radiation (OLR) variability. Main ISO events over the Indo-Pacific Warm Pool are first extracted using a local mode analysis (LMA) applied on the 20–120-d filtered OLR on the 1979–2008 period. One hundred and sixty-nine individual ISO are detected. Their propagative patterns are then objectively regrouped into a few types using a hierarchical agglomerative classification. Three alternative partitionings are retained, depending on the level of details expected from the typology. ISO events first regroup naturally into two well-sepa…
Vegetation fire emissions and their impact on air pollution and climate
2009
Gaseous and particulate emissions from vegetation fires substantially modify the atmospheric chemical composition, degrade air quality and can alter weather and climate. The impact of vegetation fire emissions on air pollution and climate has been recognised in the late 1970s. The application of satellite data for fire-related studies in the beginning of the 21th century represented a major break through in our understanding of the global importance of fires. Today the location and extent of vegetation fires, burned area and emissions released from fires are determined from satellite products even though many uncertainties persist. Numerous dedicated experimental and modeling studies contri…