54 research outputs found
Utjecaj specifiÄne veze izmeÄu materijala i prevlake na triboloÅ”ke i zaÅ”titne karakteristike proizvoda
Today, parts and tools are increasingly made of composite materials. Realization of specific connection between basic material and coating is very important. The quality of coating on products, in terms of wear and resistance to destruction, has a large impact on productivity and reliability of production processes, in particular their life. In this paper, based on experimental investigations, the effect of specific relationship between the base material and coating on tribological and protective features of the product is analyzed.Danas se dijelovi i alati sve ÄeÅ”Äe izraÄuju iz kombiniranih materijala. Ostvarenje specifiÄne veze izmeÄu osnovnog materijala i prevlake je izuzetno znaÄajno. Kvaliteta prevlake na proizvodima, sa aspekta habanja i otpornosti na razaranje, ima velik utjecaj na produktivnost i pouzdanost proizvodnih procesa, a osobito na njihov vijek trajanja. U radu je na temelju eksperimentalnih istraživanja analiziran utjecaj specifiÄne veze izmeÄu osnovnog materijala i prevlake na triboloÅ”ke i zaÅ”titne karakteristike proizvoda
Metodologija mjerenja karakteristika i izbor materijala elemenata tribomehaniÄkih sustava
Achieving the equality between the time of functional aging of mechanical systems and the time of allowed wear of the system elements is the main task of tribology. This can be reached by choosing the optimal material of elements of tribo-mehanical systems. The paper gives the results of experimental research of tribological and mechanical characteristics several pairs of material. Investigations were performed on the device with a rotating disc and static pin.Dostizanje jednakosti vjeka funkcionalnog starenja strojnih sustava i vjeka dopuÅ”tenog habanja elemenata sustava, je osnovni zadatak tribologije, koji je moguÄe izvesti izborom optimalnog materijala elemenata tribomehaniÄkog sustava. U radu se daju rezultati eksperimentalnih istraživanja triboloÅ”kih i mehaniÄkih karakteristika viÅ”e parova materijala. Istraživanja su izvedena na ureÄaju sa rotirajuÄim diskom i mirujuÄim pinom
Supplementary data for article: PetkoviÄ, B. B.; StankoviÄ, D.; MilÄiÄ, M.; Sovilj, S. P.; ManojloviÄ, D. Dinuclear Copper(II) Octaazamacrocyclic Complex in a PVC Coated GCE and Graphite as a Voltammetric Sensor for Determination of Gallic Acid and Antioxidant Capacity of Wine Samples. Talanta 2015, 132, 513ā519. https://doi.org/10.1016/j.talanta.2014.09.025
Supplementary material for: [https://doi.org/10.1016/j.talanta.2014.09.025]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1654]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3363
Influence of pumpkin seed oil in continuous phase on droplet size and stability of water-in-oil emulsions
The aim of this work was to contribute to the optimized production of water-in-oil emulsions with pumpkin seed oil in the oil phase using a high-speed homogenizer. Pumpkin seed oil is a valuable natural source of essential fatty acids and biologically active micronutrients that contribute to its nutritive value and medical uses, and reduce interfacial tension between water and the oil phases. Therefore, pumpkin seed oil can be considered as a prosperous oil phase whose use can possibly decrease the amount of some emulsifier that is normally involved in every emulsification process. A central composite rotatable experimental design was implemented to analyze the impact of the contents of polyglycerol polyricinoleate and pumpkin seed oil in the continuous phase, as well as water phase content in the emulsion on droplet size distribution and the response surface methodology was used to obtain optimal conditions for water-in-oil emulsion preparation. Mean size diameter of water droplets was in a range from 400 to 850 nm, with mean peak width of 100 to 220 nm, respectively. The influence of all three investigated factors on the emulsification was determined. Additionally, the emulsions prepared with pumpkin seed oil showed a higher stability during the storage time compared to the emulsions with sunflower oil
ECG-based prediction of atrial fibrillation development following coronary artery bypass grafting
Supplementary data for article: PetkoviÄ, B. B.; StankoviÄ, D.; MilÄiÄ, M.; Sovilj, S. P.; ManojloviÄ, D. Dinuclear Copper(II) Octaazamacrocyclic Complex in a PVC Coated GCE and Graphite as a Voltammetric Sensor for Determination of Gallic Acid and Antioxidant Capacity of Wine Samples. Talanta 2015, 132, 513ā519. https://doi.org/10.1016/j.talanta.2014.09.025
Supplementary material for: [https://doi.org/10.1016/j.talanta.2014.09.025]Related to published version: [http://cherry.chem.bg.ac.rs/handle/123456789/1654]Related to accepted version: [http://cherry.chem.bg.ac.rs/handle/123456789/3363
3D finite element electrical model of larval zebrafish ECG signals
Assessment of heart function in zebrafish larvae using electrocardiography (ECG) is a potentially useful tool in developing cardiac treatments and the assessment of drug therapies. In order to better understand how a measured ECG waveform is related to the structure of the heart, its position within the larva and the position of the electrodes, a 3D model of a 3 days post fertilisation (dpf) larval zebrafish was developed to simulate cardiac electrical activity and investigate the voltage distribution throughout the body. The geometry consisted of two main components; the zebrafish body was modelled as a homogeneous volume, while the heart was split into five distinct regions (sinoatrial region, atrial wall, atrioventricular band, ventricular wall and heart chambers). Similarly, the electrical model consisted of two parts with the body described by Laplaceās equation and the heart using a bidomain ionic model based upon the Fitzhugh-Nagumo equations. Each region of the heart was differentiated by action potential (AP) parameters and activation wave conduction velocities, which were fitted and scaled based on previously published experimental results. ECG measurements in vivo at different electrode recording positions were then compared to the model results. The model was able to simulate action potentials, wave propagation and all the major features (P wave, R wave, T wave) of the ECG, as well as polarity of the peaks observed at each position. This model was based upon our current understanding of the structure of the normal zebrafish larval heart. Further development would enable us to incorporate features associated with the diseased heart and hence assist in the interpretation of larval zebrafish ECGs in these conditions
The effect of specifi c relationship between material and coating on tribological and protective features of the product
Today, parts and tools are increasingly made of composite materials. Realization of specifi c connection between basic material and coating is very important. The quality of coating on products, in terms of wear and resistance to destruction, has a large impact on productivity and reliability of production processes, in particular their life. In this paper, based on experimental investigations, the effect of specific relationship between the base material and coating on tribological and protective features of the product is analyzed
Measurement methodology of characteristics and election of materials of elements of tribomechanical systems
Achieving the equality between the time of functional aging of mechanical systems and the time of allowed wear of the system elements is the main task of tribology. This can be reached by choosing the optimal material of elements of tribo-mehanical systems. The paper gives the results of experimental research of tribological and mechanical characteristics several pairs of material. Investigations were performed on the device with a rotating disc and static pin
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