54 research outputs found
Intenzitet habanja kod razliÄito toplinski poboljÅ”anog nodularnog lijeva
In the paper we investigate the relationship between the wear intensity of two nodular cast irons and their heat treatment conditions. Disks tempered by austempering and isothermal procedure were used. The wear test was realized by using Pin and Disk tribometer. Measurement of the disks wear, after the contact for duration of 30 min, was done by the PQ meter. The quantity of the wear products in lubricant is determined by the PQ index. The best wear resistance posses the disk isothermally tempering with 30 minutes holding at 390 Ā°C temperature.U ovom radu je ispitivana zavisnost izmeÄu intenziteta habanja dva nodularna lijeva kao i uvjeta pri njihovoj toplinskoj obradi. Uzorci za ispitivanje nodularnog lijeva su bili poboljÅ”ani klasiÄnim i izotermalnim postupkom. Ispitivanje intenziteta habanja je realizirano uz pomoÄ Pin on Disc tribometra. Mjerenje pohabanosti diska, nakon trenja u trajanju od 30 minuta, je obavljeno na PQ metru. KoliÄina Äestica nastalih kao produkti habanja, u sredstvu za hlaÄenje i podmazivanje je odreÄena PQ indexom. NajveÄu otpornost na habanje posjeduje disk izotermalno temperovan na 390 Ā°C u trajanju od 30 minuta
Interstitial cells of blood vessels
Blood vessels are made up of several distinct cell types. Although it was originally thought that the tunica media of blood vessels was composed of a homogeneous population of fully differentiated smooth muscle cells, more recent data suggest the existence of multiple smooth muscle cell subpopulations in the vascular wall. One of the cell types contributing to this heterogeneity is the novel, irregularly shaped, noncontractile cell with thin processes, termed interstitial cell, found in the tunica media of both veins and arteries. While the principal role of interstitial cells in veins seems to be pacemaking, the role of arterial interstitial cells is less clear. This review summarises the knowledge of the functional and structural properties of vascular interstitial cells accumulated so far, offers hypotheses on their physiological role, and proposes directions for future research
Localisation, function and composition of primary Ca(2+) spark discharge region in isolated smooth muscle cells from guinea-pig mesenteric arteries.
Muscarinic cation current and suppression of Ca2+ current in guinea pig ileal smooth muscle cells.
Involvement of different Ca2+ sources in changes of responsiveness of guinea-pig trachea to repeated administration of histamine and acetylcholine.
Neural Network Modeling of Cutting Fluid Impact on Energy Consumption during Turning
This paper presents a part of research on power consumption differences between various cutting fluids used during turning operations. An attempt was made to study the possibility of artificial neural network to model the behavior function and predicting the electrical power consumption. Friction factor of examined cutting fluids was also measured to describe a more complete picture of investigated cutting fluids characteristics. It was discovered that wide spectrum of characteristics is present in todayās market and that artificial neural networks are suitable for purpose of modeling the power consumption of the lathe during machining. This paper could be used as a foundation for later database building where it would be possible to predict how certain cutting fluid will behave in a specific machining parameter combination
Role of intracellular stores in the regulation of rhythmical [Ca2+]i changes in interstitial cells of Cajal from rabbit portal vein.
Effects of superoxide generating systems on muscle tone, cholinergic and NANC responses in cat airway.
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