Applied Science Private University

About: Applied Science Private University is a education organization based out in Amman, Jordan. It is known for research contribution in the topics: Catalysis & Population. The organization has 4124 authors who have published 5299 publications receiving 116167 citations.

Interaction between molybdenum and manganese to form effective dispersoids in an Al–Si–Cu–Mg alloy and their influence on creep resistance

Abstract: The present work investigates the effect of adding Mo and Mn to an Al–Si–Cu–Mg alloy on the formation of thermally stable dispersoids. Mo and Mn in combination formed a large volume fraction of uniformly distributed dispersoids within the Al matrix, because of the opposite partitioning behavior ( k M o > 1 v s . k M n 1 ) during the non-equilibrium solidification. Mo (without Mn) formed coherent α-Al(Fe,Mo)Si dispersoids with a BCC lattice, which were mostly located within intradendritic regions. Subsequent addition of Mn increased the amount of the dispersoids by substituting the Fe atoms. The combined addition also led to a more uniform dispersoid distribution by eliminating the interdendritic dispersoid-free zones (DFZs). Consequently, creep resistance in the temperature range of 300–350 °C improved significantly. At 300 °C and 30 MPa, the minimum creep rate decreased, and creep time-to-fracture and strain-to-fracture each increased with increasing Mn up to 0.5 wt%. Further addition of Mn resulted in increased presence of the eutectic intermetallics in the interdendritic regions, which deteriorated the ductility of the alloy leading to a shorter creep-life time.

Rateless Coding on Experimental Temporally Correlated FSO Channels

Abstract: We present a demonstration of two error-correction coding schemes that can successfully operate on a free-space optical (FSO) communication channel subject to atmospheric turbulence. The codes (a puntured Low-density parity-check code and a Raptor code) operate by continuously adapting the information rate to accommodate the varying channel conditions. Because these coding schemes require the use of a feedback channel, we evaluate the bandwidth cost incurred. The evaluation of the codes is performed offline and uses experimental optical signals recorded from an FSO link. We analyze the temporal characteristics of the experimental channels and compare the performance of the codes for different bit rates to asses the effect of temporal correlation and imperfect channel state information.

Experimental and Theoretical Determination of Equilibrium Interfacial Tension for the Solvent(s)–CO2–Heavy Oil Systems

Abstract: Equilibrium interfacial tension (IFT) between heavy oil and CO2 with the addition of C3H8 and/or n-C4H10 has been experimentally and theoretically determined. Experimentally, an axisymmetric drop shape analysis (ADSA) technique is used to measure both the dynamic and equilibrium IFTs between heavy oil and three pure solvents (i.e., CO2, C3H8, and n-C4H10) together with seven solvent mixtures. Theoretically, the Peng–Robinson equation of state (PR EOS) with a newly developed α function has been incorporated into a mechanistic parachor model to determine the equilibrium IFTs between heavy oil and pure solvents together with their corresponding mixtures. The addition of C3H8 and/or n-C4H10 into CO2 stream leads to an obvious reduction of IFT between heavy oil and CO2, although the degree of reduction depends upon the added amount of rich solvent(s). The mechanistic parachor model with the optimized parachor of the heavy oil and mass-transfer exponent provides a qualitative agreement with the measured equilib...