31. Study of the properties of air flow over orographic barrierMaruška Mole, 2017, doktorska disertacija Opis: Earth’s atmosphere is a complex system. All weather phenomena take place in its lowest layer, the troposphere, which is strongly influenced by human activities and the underlying surface orography. A good example of the influence the orography has on the behavior of air flows is the appearance of strong north-east downslope wind in Vipava valley, called Bora. Numerical models used to analyze flows in complex terrain need meteorological data both for setting the initial conditions and the verification of modeling results. Obtaining spatial distributions of meteorological observables can be challenging, especially in the case of strong winds, such as Bora, where traditional methods may be inadequate due to prohibitive wind speeds. In most cases, vertical properties of the atmosphere can be obtained using remote sensing techniques. Contrary to vertical profile measurements with traditional methods, remote sensing techniques do not require the measuring device to be placed within the flow and are therefore more appropriate for measurements in severe weather conditions such as strong winds.
The aim of this thesis is a detailed analysis of wind and tropospheric structure properties in and above the Vipava valley in a variety of typical atmospheric conditions, including strong wind events. It employs a combination of high resolution wind and lidar data in addition to standard meteorological measurements.
In Ajdovščina, there are four predominant wind directions, two of them directly connected to Bora. In the case of Bora, periodicity analysis of wind data from Ajdovščina yielded a range of possible wind gust periods between 1 and 7 minutes. The periods were not stable, with the periodogram less noisy for stable wind directions. Wavelike structures were found to be present in the troposphere in half of the investigated cases, regardless of the presence of Bora. In statically stable conditions, gravity waves propagated throughout
the planetary boundary layer (PBL). In the case of Bora, the PBL experienced oscillations with periods between 1 and 2 minutes. A shear layer was present above the PBL, causing Kelvin-Helmholtz waves at its boundaries with periods ranging from 3 to 6 minutes. In some cases, periodic structures were observed above the shear layer as well, which were found to have longer periods than those within the PBL.
Ključne besede: remote sensing, Vipava valley, wind properties, Bora, wind gusts, wind periodicity, tropospheric structures, Kelvin-Helmholtz waves
Objavljeno v RUNG: 18.09.2017; Ogledov: 6792; Prenosov: 200
 Celotno besedilo (45,11 MB) |
32. Introduction to Electronic Properties and Dynamics of Organic Complexes as Self‐Assembled MonolayersMaddalena Pedio, 2017, samostojni znanstveni sestavek ali poglavje v monografski publikaciji Opis: Self‐assembled monolayers (SAMs) of organic‐conjugated transition metal complexes on surfaces is a focus of both device engineering and basic science, since it is a key factor in nearly all important aspects of device performances, including operation voltages, degradation, and efficiency. The huge amount of literature results related to the first monolayer, and reorganization and self‐assembling processes are due to the general accepted result that structural and chemical properties of the first monolayer are the key parameters for controlled thin film growth. Optical and magneto‐electronic properties are intimately connected, and the accurate determination of electronic levels, excitation, and relaxation dynamics is mandatory for the optimization of electronic, photovoltaic, and opto‐electronic devices. Quite a number of electronic states is generated by the interaction of light with
complex organic molecules. Time‐resolved spectroscopies are a new investigation tool
that gives the possibility of correctly addressing their origin and life time. Examples of prototypical systems are presented and discussed. We review on complementary techniques, trying to single out how different approaches are fundamental to fully characterize
these complex systems.
Ključne besede: self‐assembled monolayer (SAM), surface structures molecular layers, nanotechnology, electronic properties, spectroscopies, time resolved
Objavljeno v RUNG: 12.06.2017; Ogledov: 4766; Prenosov: 208
Celotno besedilo (5,78 MB) |
33. Microstructure, crystallographic texture and mechanical behaviour of friction stir processed Mg-Zn-Ca-Zr alloy ZKX50M Vargas, S Lathabai, P Uggowitzer, Y Qi, D Orlov, Y Estrin, 2017, izvirni znanstveni članek Ključne besede: Mg alloys, Friction stir processing, Grain refinement, Texture, Mechanical properties
Objavljeno v RUNG: 20.02.2017; Ogledov: 4251; Prenosov: 0
Gradivo ima več datotek! Več... |
34. Determination of petrophysical properties of sedimentary rocks by optical methodsDorota Korte, Dejan Kaukler, Mattia Fanetti, Humberto Cabrera, Efrain Daubronte, Mladen Franko, 2017, izvirni znanstveni članek Ključne besede: sedimentary rocks, beam deflection spectroscopy, grain size distribution, petrophysical
properties, chemical composition
Objavljeno v RUNG: 06.02.2017; Ogledov: 4458; Prenosov: 0
Gradivo ima več datotek! Več... |
35. Surface plasmon resonance properties of DC magnetron sputtered Ag nanoislands on ITO-glass and In2O3-PET substratesFei Tong, Yoonsung Chung, J Goswami, Virginia Davis, Michael Hamilton, Kim Dong-Joo, Helen Koo, Kyeong K. Lee, Minseo Park, 2014, drugi znanstveni članki Ključne besede: Ag nanoislands, Surface plasmon resonance properties, DC magnetron sputtere, ITO-glass and In2O3-PET substrates
Objavljeno v RUNG: 16.01.2017; Ogledov: 4353; Prenosov: 0
Gradivo ima več datotek! Več... |
36. EVALUATION OF MARINE SEDIMENTS FROM THE PORT OF LUKA KOPER FROM THE ENVIRONMENTAL PERSPECTIVE AND IN TERMS OF THEIR USABILITY IN THE BRICK INDUSTRYPatrik Baksa, 2016, magistrsko delo Opis: The majority of the world’s goods are transported over water and dredging is essential for the development of harbors and ports. Therefore, the management of dredged material is a worldwide issue. Due to its chemical and petrographic, mineralogical and homogeneity composition, marine sediments are an appropriate raw material to use in the brick industry. Marine sediments can serve as raw material for the production of clay blocks, roofing and ceramic tiles.
Different analyses were carried out in order to determine if the dredged material from the Port of Koper is environmentally friendly and suitable to use in the brick industry. These analyses included: a chemical analysis, a mineralogical analysis, a particle size analysis and a chloride content (Cl-) analysis, and tests of firing in a gradient furnace. Furthermore, tests of mechanical properties, as well as tests of frost-resistance of the samples were carried out.
On the basis of primary analyses and samples prepared in a lab, it was established that marine sediments from the Port of Koper without any additives are only conditionally suitable as a source material for producing brick products. In collaboration with Gorica brickworks (Goriške opekarne), a pilot production from a mixture of 60% component B from Gorica brickworks and 40% component A (marine sediments) from the Port of Koper was prepared. Different tests showed the mixture could be appropriate for brick production.
Ključne besede: marine sediments, recycling, clay bricks, chemical analysis, mechanical properties, brick production.
Objavljeno v RUNG: 05.09.2016; Ogledov: 5743; Prenosov: 275
Celotno besedilo (3,30 MB) |
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