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: Population & Catalysis. The organization has 4124 authors who have published 5299 publications receiving 116167 citations.

Determination of Mutual Solubility between CO2 and Water by Using the Peng–Robinson Equation of State with Modified Alpha Function and Binary Interaction Parameter

Abstract: Techniques have been developed to determine mutual solubility between CO2 and water by using the Peng–Robinson equation of state (PR EOS) with a modified alpha function and a new binary interaction parameter (BIP) correlation in the presence and absence of hydrocarbons. More specifically, the alpha function for the water compound is modified by improving its prediction for water vapor pressure in the full temperature range of 273.16 to 647.10 K with an overall absolute average relative deviation (AARD) of 0.07%. Also, the polynomial temperature-dependent BIP correlation for the CO2–water pair in the aqueous phase is proposed by matching CO2 solubility in water at temperatures from 273.15 to 448.15 K and pressures up to 100 MPa. It is found that the newly modified alpha function together with the proposed BIP correlation provides more accurate prediction of the CO2 solubility in water with an overall AARD of 6.12%, compared with 8.67% from the previous exponential BIP correlation. As for the nonaqueous pha...

The thermal stability of mechanical properties of Al–B4C composites alloyed with Sc and Zr at elevated temperatures

Abstract: Two experimental Al-15 vol.% B 4 C composites, S40 with 0.4 wt.% Sc and SZ40 with 0.4 wt.% Sc plus 0.24 wt.% Zr, were prepared to examine the mechanical properties during long holding periods and the age hardening responses at elevated temperatures. Alloying with Sc or Sc and Zr displayed a significant precipitation strengthening in Al–B 4 C composites. Results showed that maximum peak hardness with a long plateau was achieved at 300–350 °C for the SZ40 composite, while the peak aging with a maximum hardness was reached at 300 °C for the S40 composite. The addition of Zr in the composite containing Sc delayed the overaging by ∼100 °C. The mechanical properties of SZ40 were considerably stable after 2000 h annealing at 300 °C, while the S40 composite exhibited a good long-term thermal stability at 250 °C. At all temperatures investigated, the Zr addition enhanced the strengthening effect and the mechanical properties of the SZ40 were higher than those of the S40 composite. The reduction of the mechanical properties of composites during prolonged annealing at higher temperatures was dominated by the precipitate coarsening.

Design, analysis and experimental study of a T-shaped piezoelectric energy harvester with internal resonance

Abstract: In this paper, a T-shaped piezoelectric energy harvester (TPEH) is proposed by taking advantages of internal resonance and multimodal techniques. The developed TPEH is composed of a clamped-sliding main beam and a branched vertical cantilever beam at the center. The sliding end of the clamped-sliding beam could move freely along the axial direction, and two piezoelectric patches are attached at both sides of the substrate near the sliding end. An electromechanical coupling model was established based on the extended Hamilton's method. The simulation results are in good agreement with the experimental results. The simulation and experimental results indicate that the 1:3 internal resonance phenomenon of the TPEH occurs when the excitation frequencies are close to the first resonance of the TPEH. As a result, the energy conversion efficiency can be significantly increased through the high-frequency response at the low-frequency excitation. Meanwhile, the operational bandwidth is widened with the hardening nonlinear response of the proposed TPEH within the first resonance bandwidth. Finally, it was demonstrated that the proposed TPEH is able to harvest practical vibration energy with low-amplitude and low frequency.