Gateway-pathway heritage and urban growth zagreb case study

This paper is a part of on-going research into the typological definition of 'urban gateway-pathways'. This term refers to routes used to connect peripheral settlements to the urban core of contemporary cities. The typology was developed with reference to a sample of 18 Central European cities that were formerly provincial capital cities of the Austro-Hungarian monarchy. This paper provides the first authoritative syntactical description of the city of Zagreb and reports on initial syntactical analysis of its historic pathway typology using the transect method established by Hi II ier (1999). The results from the transect analysis are then used to provide more refined typological descriptions of the gateway-pathways and their historical transformations, and to frame a future phase of research using segment analysis

Oscillation modes of dc microdischarges with parallel-plate geometry

Two different oscillation modes in microdischarge with parallel-plate geometry has been observed: relaxation oscillations with frequency range between 1.23 and 2.1 kHz and free-running oscillations with 7 kHz frequency. The oscillation modes are induced by increasing power supply voltage or discharge current. For a given power supply voltage, there is a spontaneous transition from one to other oscillation mode and vice versa. Before the transition from relaxation to free-running oscillations, the spontaneous increase of oscillation frequency of relaxation oscillations form 1.3 kHz to 2.1 kHz is measured. Fourier Transform Spectra of relaxation oscillations reveal chaotic behaviour of microdischarge. Volt-Ampere characteristics associated with relaxation oscillations describes periodical transition between low current, diffuse discharge and normal glow. However, free-running oscillations appear in subnormal glow only.Comment: Submitted to: New Journal of Physic

Axial light emission and Ar metastable densities in a parallel plate dc micro discharge in steady state and transient regimes

Axial emission profiles in a parallel plate dc micro discharge (feedgas: argon; discharge gap d=1mm; pressure p=10Torr) were studied by means of time resolved imaging with a fast ICCD camera. Additionally, volt-ampere (V-A) characteristics were recorded and Ar* metastable densities were measured by tunable diode laser absorption spectroscopy (TDLAS). Axial emission profiles in the steady state regime are similar to corresponding profiles in standard size discharges (d=1cm, p=1Torr). For some discharge conditions relaxation oscillations are present when the micro discharge switches periodically between low current Townsend-like mode and normal glow. At the same time the axial emission profile shows transient behavior, starting with peak distribution at the anode, which gradually moves towards the cathode during the normal glow. The development of argon metastable densities highly correlates with the oscillating discharge current. Gas temperatures in the low current Townsend-like mode (T= 320-400K) and the high current glow mode (T=469-526K) were determined by the broadening of the recorded spectral profiles as a function of the discharge current.Comment: submitted to Plasma Sources Sci. Techno

Aerosol synthesis of phosphor based on Eu3+ activated gadolinium oxide matrices

Poster presented at the Seventh International Conference on Ceramic Processing Science, Inuyama, Japan, May 15-18, 200

Analysis of interconnection between physical and protective properties of two-component epoxy primer

This paper presents the research into protective properties of two-component epoxy primer obtained by measurements of the notch corrosion and by testing of the gloss as a physical property. In order to obtain different values of measured response, the first experiment was done by applying the primer in various amounts of the dry film thickness, while the second experiment was based on combining various contents of anti-corrosion pigment. Analysis of the obtained research results proved the interconnection between the two observed properties. It was confirmed that the obtained results were inversely proportional for both experiments. Protective properties of coating could be assessed by measuring the gloss value, which is simpler and faster than measuring the notch corrosion

Aerosol synthesis of phosphor based on Eu3+ activated gadolinium oxide matrices

Poster presented at the Seventh International Conference on Ceramic Processing Science, Inuyama, Japan, May 15-18, 200

Influence of surface roughness on the rate of corrosion penetration into the steel

This research analyses the influence of surface roughness on the rate of corrosion penetration into the steel. The test specimens were mechanically treated with fine abrasive jet to make their surface slightly rougher than it was in the initial state. The test specimens were then kept in conditions of atmospheric corrosion for 90 days to be tested afterwards by weighing, i.e. by the mass loss method. The analysis showed that a slight increase in surface roughness facilitated faster development of corrosion mechanisms, thus drastically increasing the rate of corrosion penetration into the material. Changes in surface roughness can be also caused by abrasion or erosion damage, so it is important to choose adequate surface protection technologies for prevention of unwanted wear of the steel

Analysis of the vehicle exhaust system corrosion and its effect on the ECO-test result

This paper deals with analysis of the vehicle exhaust system quality and its influence on the results of measuring exhaust emissions of the Otto and Diesel motor vehicles. Results of eco-tests obtained from correct and faulty vehicle exhaust systems were compared to conclude that damages caused by corrosion had significant influence on the pass rate of vehicles at eco-test. Referring to vehicles with the Otto engine, damages in the exhaust system increase the oxygen level, which results in the increased λ factor and in failure at the eco-test. On the contrary, vehicles with the damaged Diesel engine exhaust system allow the gas to leak through the damage, so the measurement of blackening is lower, i.e. the eco-test result is better than that of the exhaust system without damage

Testing of the shopprimer’s influence on the quality of welded joint

This paper presents the process of preparing the surface of construction material and applying the temporary protection that refers to the two-component epoxy workshop primer (shopprimer) in order to perform testing of its influence on mechanical properties of the weld. Testing of mechanical properties of welds after welding proved that there were no negative influences of the protective coating on the quality of welded joint

Comparison of adhesion properties of the primers for wide consumption

This research focused on comparison of adhesion properties of three different primers for wide consumption. Tested primers differed in their price range, and the conducted experiment aimed to determine whether more expensive primers were providing better adhesion between the substrate material and the coating. The primers were applied on specimens in two layers, each being 30 μm thick (total dry film thickness was 60 μm), as well as in one layer being 45 μm thick. After drying, specimens were exposed to indoor and outdoor atmospheric conditions. Adhesion properties were tested by the cross-cut test, and analysis of obtained results proved that the primers’ price range cannot be considered as an indicator of the primers’ quality with respect to their adhesion properties