S. A. R. Hashemi; S. A. Taghavimotlagh; R. Ghorbani; A. Hedayati
Volume 3, Issue 1 , March 2013, Pages 1-6
Abstract
During this study from December 2009 to November 2011, 363Deep flounder fish were caught and their weight and length were measured. The caught fish included 18 males, 200 females and 155 immature fishes. The mean, maximum and minimum total lengths were 264 ± 57 (mean ± SD), 415 mm and 115 ...
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During this study from December 2009 to November 2011, 363Deep flounder fish were caught and their weight and length were measured. The caught fish included 18 males, 200 females and 155 immature fishes. The mean, maximum and minimum total lengths were 264 ± 57 (mean ± SD), 415 mm and 115 mm respectively. The mean, maximum, and minimum total weights for this species were 238 ± 150 g, 827 g and 14 g respectively. The calculated length-weight relationships were W=0.000007FL3.09 (n=200, R2= 0.96) for the female, W=0.00002FL2.90 (n=18, R2=0.94) for the male and W=0.000009FL3.04 (n=363, R2 =0.96) for total fish. With a verified calculated b as 3 Student t-test showed no significant difference between calculated b and 3 (P>0.05), demonstrating that the growth pattern is isometric. Population parameters calculated for total fish were L∞= 42 (cm); K= 1 (year-1); t0= -0.14 and Ф’= 3.24. Based on the results, this species is classified as mediate vulnerable group fish.
A. MashinchianMoradi; M. Pirouznezhad
Volume 3, Issue 1 , March 2013, Pages 7-12
Abstract
The present study was carried out in 2011 to measure concentration of heavy metals chromium and tin in liver and muscle tissue of Liza aurata (golden grey mullet) in estuaries of the rivers Babolroud, Tajan and Gorganroud. Accordingly, after sampling the target are asandisolating muscle (18samples) and ...
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The present study was carried out in 2011 to measure concentration of heavy metals chromium and tin in liver and muscle tissue of Liza aurata (golden grey mullet) in estuaries of the rivers Babolroud, Tajan and Gorganroud. Accordingly, after sampling the target are asandisolating muscle (18samples) and liver (18samples) tissues, they were digested and analyzed using Graphite Furnace Atomic Absorption Spectrometer (GFAAS). Then, the obtained data were analyzed statistically using Spss19. The results indicated that the concentration of the metals in liver was higher than the muscle tissue. The highest concentration was related to the tin metal in liver tissue of the golden grey mullet measured from Gorganroud Area while the lowest concentration was related to chromium reported from the estuary of Tajan River. Asignificant difference (P<0.05) was observed between the concentrations of chromium metal in liver and muscle tissue. No significant difference was recorded between the concentrations of tin metal in liver and muscletissue of golden grey mullet (P>0.05). At the end, relationship between weight, length and average concentration of tin and chromium in liver and muscle tissue of golden grey mullet were analyzed by Pearson'stest. A significant reverse linear correlation wasfound between concentration of tin and the weight (p<0.05).
N. Moayyeri; K. Saeb; E. Biazar
Volume 3, Issue 1 , March 2013, Pages 13-16
Abstract
Heavy metals are highly poisonous in the environment, even in small quantities, and endanger certain species and all live beings. Current methods of removing heavy metals from aqueous media include chemical sequestration, ion exchange, surface absorption, membrane processes, oxidation and revival procedures ...
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Heavy metals are highly poisonous in the environment, even in small quantities, and endanger certain species and all live beings. Current methods of removing heavy metals from aqueous media include chemical sequestration, ion exchange, surface absorption, membrane processes, oxidation and revival procedures which have high investment and exploitation costs. Hence, it is significantly necessary to develop new and economical methods for effective removal of these metals from water and sewage. The present paper aims to evaluate efficiency of microparticles in removing heavy metals from water. Results of application of hydroxy-apatite microparticles as absorbers of heavy metals show that the absorption percentage average of lead (84.72%) by hydroxy-apatite microparticles is greater than that of cadmium (49.89%), zinc (72.90%), iron (74.50%) and nickel (79.25%).
M. Kashefiolasl; H. Zargarlelahi
Volume 3, Issue 1 , March 2013, Pages 25-32
Abstract
Pollution of marine waters is one of the important issues that has a irreparable effects. Also, in the organic oil pollutants, due to inappropriate effects on the environment and humans health and ability to create cancer, hydro carbons of polycyclic (PAHS) and heavy metals (Ni,Hg,V) have a particular ...
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Pollution of marine waters is one of the important issues that has a irreparable effects. Also, in the organic oil pollutants, due to inappropriate effects on the environment and humans health and ability to create cancer, hydro carbons of polycyclic (PAHS) and heavy metals (Ni,Hg,V) have a particular importance. According to the importance of study of the environ mental contaminants in the four operational regions Siri , Lavan ,Khark and heavy metals (Ni,V,Hg) in the water and sediments was performed in two stage that was for sampling from receptive environment pollution. The sampling was accomplished with VAN VEEN GRAB device. Results are showed that concentration of the oil pollutants and heavy metals generally are dropped in the water and increased in the sediments.
M. Tajari; F. Azarsina; N. Ashrafi Khorasani
Volume 3, Issue 1 , March 2013, Pages 33-42
Abstract
Explosion and fire on an offshore rig can lead to its minor or complete damage and sinking which means the loss of life or environmental pollution. Hence the use of techniques such as blast wall is crucial to reduce the detrimental effects. These blast walls are designed for explosion wave of length ...
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Explosion and fire on an offshore rig can lead to its minor or complete damage and sinking which means the loss of life or environmental pollution. Hence the use of techniques such as blast wall is crucial to reduce the detrimental effects. These blast walls are designed for explosion wave of length between 0.1 to 1 of load mainly to protect the personnel and critical sections. In this research, the behavior of an offshore platform jacket under blast wave 0.2 and 0.7of load is studied with the blast wall thickness of 1, 5 and 10 mm. The analysis is performed in both plastic and elastic aspects in which we need to consider the nonlinear geometrical and material properties.
Volume 3, Issue 1 , March 2013, Pages 17-24
Abstract
This paper presents simplified hydrodynamics model for a biomimetic robot fish based on quantitative morphological and kinematic parameters of crangiform fish. The motion of four Pangasius sanitwongsei with different length and swimming speed were recorded by the digital particle image velocimetry (DPIV) ...
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This paper presents simplified hydrodynamics model for a biomimetic robot fish based on quantitative morphological and kinematic parameters of crangiform fish. The motion of four Pangasius sanitwongsei with different length and swimming speed were recorded by the digital particle image velocimetry (DPIV) and image processing methods and optimal coefficients of the motion equations and appropriate location of joints are empirically derived. The swimming speed of fish can be adjusted by changing oscillating frequency, amplitude and the length of oscillatory part, respectively. Experimental results show that the oscillating amplitude increases dramatically from 1/3 of body and is very small near the head. So the second order function which describes wave amplitude of Pangasius sanitwongsei undulatory movement equation was found and the oscillatory motion of the biomimetic robot fish will be simulated according to this equation.