Shuttle radar topography mission - dostupnost podataka i ostvarena tačnost

This paper aim is to determine accuracy of digital terrain model (DTM) formed upon Shuttle Radar Topography Mission (SRTM) data, for the region of the Republic of Serbia. Main characteristics of SRTM will be introduced, along with short description of determining DTM based on SRTM data and accuracy of such derived digital terrain model.Cilj ovog rada je da se odredi tačnost digitalnog modela terena (DMT) formiranog na osnovu podataka šatlove radarske topografske misije (Shuttle Radar Topography Mission - SRTM), za područje Republike. Srbije. U radu će biti predstavljene glavne karakteristike SRTM-a kao i kratak opis samog postupka određivanja DMT-a na osnovu SRTM podataka i određivanje tačnosti tako dobijenog digitalnog modela terena

Airborne Laser Scanning (ALS) point cloud ground filtering for area of an active landslide (Doren, Western Austria)

Ground filtering of point cloud is the primary step required for Digital Terrain Model (DTM) generation. The procedure is especially interesting for forested areas, since LiDAR systems can measure terrain elevation under vegetation cover with a high level of penetration. This work analyzes the potential of ALS data ground filtering for area of an active landslide. The results of ALS filtering, for example, may improve geomorphological and motiondetection studies. ALS data was collected during flight campaign 2011 under leaf-off conditions for Doren region, Vorarlberg, Western Austria. In this area, non-ground objects are mostly low vegetation such as shrubs, small trees etc. The vegetation is more dense in lower part of the landslide where erosion is smaller. Vegetation points can be removed based on the hypothesis that these are significantly higher than their neighboring points. However, in case of steep terrain, ground points may have the same heights as vegetation points, and thus, local slope should be considered. Also, if terrain roughness increases, the classification may become even more complex. Software system OPALS (Orientation and Processing of Airborne Laser Scanning data, Vienna University of Technology) was used for processing the ALS data. Labeling ground points has been made using physical and geometrical attributes (parameters) of ALS points. Also additional attributes were calculated in order to improve extraction. Since bare ground surface is usually smooth and continuous unlike vegetation, standard deviation of local elevations was used as roughness measure to differentiate these surfaces. EchoRatio (ER) was adopted as a measure of surface penetrability, while number of echoes and differentiation between echoes (EchoNumber) were also deployed in filtering. Since the ground points are measurements from bare-earth that are usually the lowest surface features in a local area, normalized height was defined as a rank of neighboring points. Additionally, a so-called openness parameter was used as a convexity/concavity measure of surface. All of the mentioned point attributes have been combined in a decision tree in order to extract bare ground points. Based on a preliminary analysis, it is noted that implemented filtering procedure has difficulties with surfaces with rough terrain or steep relief. There is an assumption for lack of ground points in areas with dense vegetation that reduced the penetration of laser beams to the ground (lower part of a landslide). Also, points representing low vegetation were often labeled as ground points. Procedure produced holes in point cloud which demanded appropriate interpolation methods to be applied.Geophysical Research Abstract

Airborne Laser Scanning (ALS) point cloud ground filtering for area of an active landslide (Doren, Western Austria)

Ground filtering of point cloud is the primary step required for Digital Terrain Model (DTM) generation. The procedure is especially interesting for forested areas, since LiDAR systems can measure terrain elevation under vegetation cover with a high level of penetration. This work analyzes the potential of ALS data ground filtering for area of an active landslide. The results of ALS filtering, for example, may improve geomorphological and motiondetection studies. ALS data was collected during flight campaign 2011 under leaf-off conditions for Doren region, Vorarlberg, Western Austria. In this area, non-ground objects are mostly low vegetation such as shrubs, small trees etc. The vegetation is more dense in lower part of the landslide where erosion is smaller. Vegetation points can be removed based on the hypothesis that these are significantly higher than their neighboring points. However, in case of steep terrain, ground points may have the same heights as vegetation points, and thus, local slope should be considered. Also, if terrain roughness increases, the classification may become even more complex. Software system OPALS (Orientation and Processing of Airborne Laser Scanning data, Vienna University of Technology) was used for processing the ALS data. Labeling ground points has been made using physical and geometrical attributes (parameters) of ALS points. Also additional attributes were calculated in order to improve extraction. Since bare ground surface is usually smooth and continuous unlike vegetation, standard deviation of local elevations was used as roughness measure to differentiate these surfaces. EchoRatio (ER) was adopted as a measure of surface penetrability, while number of echoes and differentiation between echoes (EchoNumber) were also deployed in filtering. Since the ground points are measurements from bare-earth that are usually the lowest surface features in a local area, normalized height was defined as a rank of neighboring points. Additionally, a so-called openness parameter was used as a convexity/concavity measure of surface. All of the mentioned point attributes have been combined in a decision tree in order to extract bare ground points. Based on a preliminary analysis, it is noted that implemented filtering procedure has difficulties with surfaces with rough terrain or steep relief. There is an assumption for lack of ground points in areas with dense vegetation that reduced the penetration of laser beams to the ground (lower part of a landslide). Also, points representing low vegetation were often labeled as ground points. Procedure produced holes in point cloud which demanded appropriate interpolation methods to be applied.Geophysical Research Abstract

Pseudocapacitance behavior of polyaniline in aerated HC1 and H2SO4 solutions

High conducting polyaniline (PANI) nanofibres deposited onto glassy carbon support were studied in sulphuric (1mol dm-3 H2SO4) and hydrochloric (1mol dm-3 HCl) acid by both potentiodynamic and complex impedance methods. A large charge storage capacity was obtained in each of investigated acid solutions, particularly in HCl one. For instance, specific capacity amounting to 340 Fg-1 was observed potentiodynamically in 1mol dm-3 HCl at a scan rate of 10 mVs-1

Shuttle radar topography mission: Availability of data and the accuracy achieved

This paper aim is to determine accuracy of digital terrain model (DTM) formed upon Shuttle Radar Topography Mission (SRTM) data, for the region of the Republic of Serbia. Main characteristics of SRTM will be introduced, along with short description of determining DTM based on SRTM data and accuracy of such derived digital terrain model.

Shuttle radar topography mission: Availability of data and the accuracy achieved

This paper aim is to determine accuracy of digital terrain model (DTM) formed upon Shuttle Radar Topography Mission (SRTM) data, for the region of the Republic of Serbia. Main characteristics of SRTM will be introduced, along with short description of determining DTM based on SRTM data and accuracy of such derived digital terrain model.Cilj ovog rada je da se odredi tačnost digitalnog modela terena (DMT) formiranog na osnovu podataka šatlove radarske topografske misije (Shuttle Radar Topography Mission - SRTM), za područje Republike. Srbije. U radu će biti predstavljene glavne karakteristike SRTM-a kao i kratak opis samog postupka određivanja DMT-a na osnovu SRTM podataka i određivanje tačnosti tako dobijenog digitalnog modela terena

OPTIMIZACIJA ULTRAZVUČNO PODPOMOGNUTE ADSORPCIJE Cu(II) NA KARBONIZOVANIM I AKTIVIRANIM LJUSKAMA ORAHA

The effects of ultrasound (US) on the adsorption process of Cu(II) on granulated activated carbon (GAC), produced by walnut shells, was studied in this paper. Equilibrium results of the adsorption process are tested by Freundlich and Langmuir adsorption isotherms, and their linearization and determination of model parameters k; n; b and Qo. The adsorption capacity of GAC is 1.7 to 3.86 mmol/g with the use of US, and 0.66 to 2.7 mmol /g without the use of US. The increase of specific surface and initial concentration increase the efficacy of adsorption. Acquired mathematical regression equations very well represent experimental results, and the correlation coefficient (R2) is greater than 0.993.U radu su prikazani rezultati uticaja ultrazvuka na proces adsorpcije Cu(II) jona na granulisanom aktivnom uglju (GAC) proizvedenom od orahovih ljuski. Rezultati dobijeni tokom procesa adsorpcije testirani su pomoću Freundich i Langmuir modela adsorpcionih izotermi,a parametri modela: k; n; b i Qo, određeni su njihovom linearizacijom. Matematički modeli koji koreliraju ravnotežnu adsorpciju (q) sa specifičnim površinom GAC (S) i početnim koncentracijama Cu(II) (Co) određeni su matematičkim planiranjem eksperimenta i regressionom analizom. Dobijeni rezultati ukazuju na doprinos upotrebe ultrazvuka tokom adsorpcije Cu(II) iz vodenog rastvora. Veličina specifične površine i početne koncentracije ima pozitivan uticaj na veličinu adsorpcione ravnoteže. Dobijeni matematičkimodeli vrlo dobro prate eksperimentalne rezultate

The optimization of zinc dialkyldithiocarbamates synthesis and determination of their antioxidant activity

A two-step optimized laboratory synthetic method of zinc dialkyldithiocarbamates is presented. In the course of the first phase, a sodium salt of dialkyldithiocarbamic acid has been synthesized from the dialkylamines, carbon disulfide and sodium hydroxide. The synthesis of zinc dialkyldithiocarbamates was achieved by the precipitation from sodium dialkyldithiocarbamic acid by zinc sulfate under the optimized conditions. The synthesized products have been characterized by FTIR, 1H and 13C NMR, AAS spectroscopic methods, as well as by elemental analysis and melting points. Kinetic studies of the motor oil oxidation inhibited by synthesized compounds have been tested using a standard method