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Evaluating the Effect of Different Mixing Rules on Thermodynamic Properties in Different Mixtures
Fatemeh Fadaei Nobandegani,
Abouzar Roeintan
Issue:
Volume 8, Issue 1, March 2020
Pages:
1-6
Received:
22 June 2019
Accepted:
16 July 2019
Published:
8 January 2020
Abstract: The purpose of this paper is to evaluate the effect of five different mixing rules on the calculated thermodynamic properties including vapor pressure, density and excess property of several binary mixtures. These properties are calculated by ISM (Ihm-Song-Mason) and PHS (Perturb Hard Sphere) equations of state (EOS). Also we use two interaction parameters, Kij to improve the results. The results indicate that mixing rules can effect on predicted thermodynamic properties. The Fit (MADAR-1) mixing rule gives more acceptable values. when the mixture components are similar in size, different mixing rules often do not change the errors in calculated properties more than 2%-1%. However, as the size similarity decreases, the effect of applied mixing rules becomes more important.
Abstract: The purpose of this paper is to evaluate the effect of five different mixing rules on the calculated thermodynamic properties including vapor pressure, density and excess property of several binary mixtures. These properties are calculated by ISM (Ihm-Song-Mason) and PHS (Perturb Hard Sphere) equations of state (EOS). Also we use two interaction pa...
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Simulation of Cracking in High Concrete Gravity Dam Using the Extended Finite Elements by ABAQUS
Issue:
Volume 8, Issue 1, March 2020
Pages:
7-15
Received:
8 December 2019
Accepted:
30 December 2019
Published:
8 January 2020
Abstract: China's energy demand is growing rapidly and large hydropower plants are becoming more common. This therefore has resulted in the building of many large concrete dams across the country. Significant dam cracking can have major environmental, economic and social consequences. Collapse of High concrete dam may cause serious harm to economic development as well as safety of the people; thereby necessitating the need for research on safety and stability of high concrete dam under high water and seismic conditions. In this paper, the high concrete dam of Longtan was used as an example, using the ABAQUS program based on the extended finite element method to analyze the Longtan Dam under static and dynamic conditions which has been commonly used for the study of crack growth. A numerical prediction of crack propagation in concrete gravity dams is presented. The two-dimensional seismic numerical study was done using acceleration-time records from Koyna earthquake in 1976 Dam concrete cracking range and cracking were discussed during a seismic time. The locations that are easy to generate cracks are illustrated from the analysis and the findings showed that, during seismic activity the Longtan Dam was rather unsafe. The results of the work can provide a valuable guide for the design and operation of the dam system.
Abstract: China's energy demand is growing rapidly and large hydropower plants are becoming more common. This therefore has resulted in the building of many large concrete dams across the country. Significant dam cracking can have major environmental, economic and social consequences. Collapse of High concrete dam may cause serious harm to economic developme...
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Study the Flux and Energy of the Helium Ions Beam Produced by Two Different Dense Plasma Focus Devices When Gas Pressure Changes
Walid Sahyouni,
Alaa Nassif,
Ola Zeidan
Issue:
Volume 8, Issue 1, March 2020
Pages:
16-20
Received:
25 September 2019
Accepted:
7 October 2019
Published:
10 January 2020
Abstract: In this study, the flux and energy of the helium ions beam produced by United Nations University/International Centre for Theoretical Physics Plasma Fusion Facility (UNU/ICTP PFF) and NX2 dense plasma focus devices, were studied when the pressure of gas changed by carrying out numerical experiments using Lee code. The results showed that the value of the ions beam flux increased with increasing the gas pressure until reaching a maximum value 1.463E+28 ions. m-2s-1 at 7 Torr in UNU/ ICTP PFF device while in NX2 device the maximum value is 6.442E+27 ions. m-2s-1 at 14 Torr and then decreasing while continuing pressure increasing, but the energy of ions beam showed the opposite behavior where the maximum value of energy of the helium ions beam was 13 Joul at 5 Torr in UNU/ICTP PFF device while it was 144 Joul at 14 Torr in NX2 device this is due to the effect of the geometric dimensions on the value of the induced voltage within the plasma pinch.
Abstract: In this study, the flux and energy of the helium ions beam produced by United Nations University/International Centre for Theoretical Physics Plasma Fusion Facility (UNU/ICTP PFF) and NX2 dense plasma focus devices, were studied when the pressure of gas changed by carrying out numerical experiments using Lee code. The results showed that the value ...
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Investigation of Heavy Metal Contents in Cow Milk Samples from Area of Merowe-Sudan
Mawia Hassan Elsaim,
Rasha Jame,
Yahya Ali
Issue:
Volume 8, Issue 1, March 2020
Pages:
21-24
Received:
6 April 2019
Accepted:
20 May 2019
Published:
10 March 2020
Abstract: Cow’s milk is considered as one of responsible food sources contamination with heavy metals. The objective of the study were to assess to content of selected heavy metals in fresh cow's milk and its associated human health risks in the food chain in Sudan. Fresh cow's milk samples were collected from two dairy of Merowe city-North Sudan by using Atomic Absorption Spectrophotometer (AAS) was used for the quantitative determination of the concentration of sex heavy metals namely (Cd, Cr, Cu, Pb, Zn and Mn) in samples available, the elements of (Cd 0.007, 0.005, 0.008) (Cr 0.008, 0.009, 0.007) (Cu 0.500, 0.340, 0.460) (Pb 0.009, 0.006, 0.005) (Zn 3.120, 2.000, 1.640) (Mn, 0.120, 0.080, 0.160). These values are compared with Recommended Dietary Allowance (ARD) values and also with corresponding values of different countries available in the literature our result of this paper it is co strong to meager the concentration of seven heavy metals and show an important.
Abstract: Cow’s milk is considered as one of responsible food sources contamination with heavy metals. The objective of the study were to assess to content of selected heavy metals in fresh cow's milk and its associated human health risks in the food chain in Sudan. Fresh cow's milk samples were collected from two dairy of Merowe city-North Sudan by using At...
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