| 1. |
- Abdollahi, Somayeh, et al.
(författare)
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3D joint inversion of gravity data and Rayleigh wave group velocities to resolve shear-wave velocity and density structure in the Makran subduction zone, south-east Iran
- 2019
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Ingår i: Journal of Asian Earth Sciences. - : PERGAMON-ELSEVIER SCIENCE LTD. - 1367-9120 .- 1878-5786. ; 173, s. 275-290
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Tidskriftsartikel (refereegranskat)abstract
- In this study, we developed a method to invert jointly Rayleigh wave group velocities and gravity anomalies for velocity and density structure of the lithosphere. We applied the method to the Makran accretionary prism, SE Iran. The reason for using different data sets is that each of these data sets is sensitive to different parameters. Surface wave group velocities are sensitive mainly to shear wave velocity distribution in depth but do not well resolve density variations. Therefore, joint inversion with gravity data increases the resolution of density distribution. Our approach differs from others mainly in the model parameterization: Instead of subdividing the model into a large number of thin layers, we invert for the properties of only four layers: thickness, P- and S-wave velocities and densities and their vertical gradients in sediments, upper-crust, lower-crust and upper mantle. The method is applied first to synthetic models in order to demonstrate its usefulness. We then applied the method to real data to investigate the lithosphere structure beneath the Makran. The resulting model shows that Moho depth increases from Oman Sea (18-33 km) and Makran fore-arc (33-37 km) to the volcanic-arc (44-46 km). The crustal density is high in the Oman Sea as should be expected for the oceanic crust. We also find a high-velocity anomaly in the upper mantle under the Oman Sea corresponding to the subducting slab. The crust under the fore-arc, volcanic-arc and back-arc settings of Makran subduction zone is characterized by low-velocity zones.
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| 2. |
- Abdollahi, Somayeh, et al.
(författare)
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Crustal and upper mantle structures of Makran subduction zone, SE Iran by combined surface wave velocity analysis and gravity modeling
- 2018
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Ingår i: Tectonophysics. - : ELSEVIER SCIENCE BV. - 0040-1951 .- 1879-3266. ; 747, s. 191-210
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Tidskriftsartikel (refereegranskat)abstract
- The inversion of Rayleigh wave group velocity dispersion curves is challenging, because it is non-linear and multimodal. In this study, we develop and test a new Rayleigh wave dispersion curve inversion scheme using the Shuffled Complex Evolution (SCE) algorithm. Incorporating this optimization algorithm into the inverse procedure not only can effectively locate the promising areas in the solution space for a global minimum but also avoids its wandering near the global minimum in the final stage of search. In addition, our approach differs from others in the model parameterization: Instead of subdividing the model into a large number of thin layers, we invert for thickness, velocities and densities and their vertical gradients of four layers, sediments, upper-crust, lower-crust and upper mantle. The proposed inverse procedure is applied to non-linear inversion of fundamental mode Rayleigh wave group dispersion curves for shear and compressional wave velocities. At first, to determine the efficiency and stability of the SCE method, two noise-free and two noisy synthetic data sets are inverted. Then real data for Makran region in SE Iran are inverted to examine the usage and robustness of the proposed approach on real surface wave data. In a second step, we applied 3D Gravity Modeling based on surface wave analysis results to obtain the density structure and thickness of each layer. The reason for using both types of data sets, is that gravity anomaly has a bad vertical resolution and surface wave group velocities are good for placing layer limits at depth, but they are not very sensitive to densities. Therefore, using gravity data increases the overall resolution of density distribution. In a final step, we used again the SCE method to invert the fundamental mode Rayleigh wave group dispersion curves based on the gravity results. Gravity results like thicknesses and sediment densities have been used to constrain the limit of search space in the SCE method. Results show a high shear and compressional velocity under the Gulf of Oman which reduce to the North of the Makran region. The Moho depth of the Oman Gulf is about 18-28 km and it increases to 46-48 km under the Taftan-Bazman volcanic-arc. The density image shows an average crustal density with maximum values under the Gulf of Oman decreasing northward to the Makran.
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| 3. |
- Bahram, Somayeh, et al.
(författare)
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Effect of whey Protein Concentrate Coating Cinamon Oil on Quality and Shelf Life of Refrigerated Beluga Sturegeon (Huso huso)
- 2016
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Ingår i: Journal of Food Processing and Preservation. - : Wiley. - 0145-8892 .- 1745-4549. ; 39:6, s. 743-749
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Tidskriftsartikel (refereegranskat)abstract
- This study evaluated the effect of whey protein concentrate (WPC) coating incorporated with 1.5% cinnamon essential oil (CEO) on the quality of beluga sturgeon (Huso huso) fillet during refrigerated storage (4 ± 1C). Microbial, chemical, and sensorial properties of the fillets were measured for 20 days. Whey protein edible coating containing 1.5% CEO could extend preserving ability of beluga sturgeon by about 8 days by retarding lipid oxidation and microbial deterioration as reflected by Peroxide Value, Thiobarbituric acid and total viable count. Samples coated with WPC containing CEO also had the lowest pH and Total Volatile Basic Nitrogen. Moreover, the coating did not negatively affect sensory attributes of the fillets.
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| 4. |
- Bahram, Somayeh, et al.
(författare)
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Whey Protein Concentrate Edible Film Activated with Cinnamon Essential Oil
- 2014
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Ingår i: Journal of Food Processing and Preservation. - : Hindawi Limited. - 0145-8892 .- 1745-4549. ; 38:3, s. 1251-1258
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Tidskriftsartikel (refereegranskat)abstract
- An active protein‐based film was developed by incorporating cinnamon essential oil (CEO) into whey protein concentrate (WPC) at a level of 0.8 and 1.5% v/v. The effects of CEO on microstructure, physical, mechanical and antimicrobial properties of the films were evaluated. Adding CEO to the WPC matrix decreased the water vapor permeability of the films and water solubility by 38.03 and 29.4%, respectively. The films containing CEO also displayed lower affinity to water; the contact angle increased up to 89.61% in 1.5% CEO concentration. Films containing CEO showed notable antibacterial activity against both gram‐positive and gram‐negative strains, and exhibited good inhibitory effect on the studied fungi. However, CEO containing films showed a heterogeneous cracked structure which decreased their tensile strength. This combination of the results confirmed good potential to the film for application in food packaging.
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