Sultan Qaboos University

About: Sultan Qaboos University is a education organization based out in Muscat, Oman. It is known for research contribution in the topics: Population & Medicine. The organization has 7767 authors who have published 14605 publications receiving 241390 citations. The organization is also known as: SQU.

Techno-economic evaluation of biogas production from food waste via anaerobic digestion.

Abstract: Food waste is a major constituent in municipal solid wastes and its accumulation or disposal of in landfills is problematic, causing environmental issues. Herein, a techno-economic study is carried out on the potential of biogas production from different types of food waste generated locally. The biogas production tests were at two-time sets; 24-h and 21-day intervals and results showed a good correlation between those two-time sets. Thus, we propose to use the 24-h time set to evaluate feedstock fermentation capacity that is intended for longer periods. Our approach could potentially be applied within industry as the 24-h test can give a good indication of the potential substrate gas production as a quick test that saves time, with minimal effort required. Furthermore, polynomial models were used to predict the production of total gas and methane during the fermentation periods, which showed good matching between the theoretical and practical values with a coefficient of determination R2 = 0.99. At day 21, the accumulative gas production value from mixed food waste samples was 1550 mL per 1 g of dry matter. An economic evaluation was conducted and showed that the case study breaks-even at $0.2944 per cubic metre. Any prices above this rate yield a positive net present value (NPV); at $0.39/m3 a discounted payback period of six years and a positive NPV of $3108 were calculated. If waste management fee savings are to be incorporated, the total savings would be higher, increasing annual cash flows and enhancing financial results. This economic evaluation serves as a preliminary guide to assess the economic feasibility based on the fluctuating value of methane when producing biogas from food waste via anaerobic digestion, thus could help biogas project developers investigate similar scale scenarios .

State Diagram of Freeze-dried Garlic Powder by Differential Scanning Calorimetry and Cooling Curve Methods

Abstract: zable water zable water zable water zable water, and the G , and the G , and the G , and the G , and the Gordon-Taylor model, r aylor model, r aylor model, r aylor model, r aylor model, respectively. Maximal-freeze-concentrated condition was found ated condition was found ated condition was found ated condition was found ated condition was found as as as as X X X X X w (character acter acter acteristic water content) = 0.82 ( istic water content) = 0.82 ( istic water content) = 0.82 ( istic water content) = 0.82 ( istic water content) = 0.82 (X s (characteristic solids content) = 0.18) with the char istic solids content) = 0.18) with the char istic solids content) = 0.18) with the char istic solids content) = 0.18) with the char istic solids content) = 0.18) with the characteristic tem- istic tem- istic tem- istic tem- istic tem- per per per

Barrier inhomogeneities of tungsten Schottky diodes on 4H-SiC

Abstract: Electrical properties of tungsten on silicon carbide (4H-SiC) Schottky diodes are investigated through the analysis of the forward current–voltage (I–V) characteristics measured at elevated temperatures within the range of 303–448 K. The subsequently derived Schottky barrier heights (SBHs) and ideality factors are found to be temperature dependent with distributions that are adequately explained within the framework of the model proposed by Tung in which he considers the barrier at a metal–semiconductor interface as consisting of locally non-uniform but interacting patches of different barrier heights embedded in a background of uniform barrier height. A uniform barrier height of 1.248 eV, a Richardson's constant of 129.95 A cm−2 K2 and a factor To of 23.92 K obtained agree very well with values published previously for similar Schottky barrier systems. Therefore, it has been concluded that the temperature-dependent I–V characteristics of the device can be successfully explained with lateral inhomogeneities distribution of the SBH.