Aida Didaran; Gholam Hoseyn Vosoughi; Ali Mashinchian Moradi
Volume 6, Issue 1 , January 2022, Pages 1-7
Abstract
Tiger Cuttlefish-Sepia pharaonis – Herenberg 1831-is a is a seafood species that belongs to five fishing stations in the Bahrakan Bay ( the waters of the Persian Gulf). 3specimens of Cuttlefish-Sepia pharaonis –, regardless of being male or female specimens, have been caught.The amount of ...
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Tiger Cuttlefish-Sepia pharaonis – Herenberg 1831-is a is a seafood species that belongs to five fishing stations in the Bahrakan Bay ( the waters of the Persian Gulf). 3specimens of Cuttlefish-Sepia pharaonis –, regardless of being male or female specimens, have been caught.The amount of these heavy metals by using atomic absorption spectrophotometer (AAS) was determined.The Range of concentrations of the heavy metals on the basis of dry weight, respectively is: The Concentrations of Cd, Cu, Pb in the samples of Cuttlefish -Sepia pharaonis- 0.54 to 0.25,3.98 to 2.12and from 0.09-0.03 (mg / kg)were measured. The level of contamination by heavy metals in Cuttlefish -Sepia pharaonis- of the Bahrakan Bay-Persian Gulf Shows that the amount of heavy metals in the species of Cuttlefish -Sepia pharaonis- that is studied on ,according to the standard of US FDA ,is within the limits permitted for human consumption and The results reveal that the concentration of the metals can be compared in this way: Cu>Pb> Cd. As a result of this study, acorrelation between climatic parameters (5 different locations of Cuttlefish -Sepia pharaonis-live in the Bahrakan Bay) and accumulation of heavy metals were found in the Cuttlefish -Sepia pharaonis-.To select the location of Cuttlefish-Sepia pharaonis – fishing as you go from the province of Khuzestan to Bushehr , the contamination by heavy metals: lead, copper, cadmium, in this fish will behigher.
Seyed Reza Samaei; Mohammad Asadian Ghahferokhi; Farhood Azarsinai
Volume 6, Issue 1 , January 2022, Pages 8-16
Abstract
Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce ...
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Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce the unforeseen costs in project implementation. In this study, using geometric similarity methods and Froude dimensionless numbers, two floating pontoon breakwater has been built in workshop and were affected by the three waves with different technical specifications. Furthermore, for a more extensive review of the breakwater performance, tests in three different drafts has been executed on them. Then transfer coefficients for different mentioned conditions have been evaluated and calculated and its relations with the draft and the waves were obtained. Finally, after analyzing and comparing the obtained transmission coefficients, the best breakwater in terms of performance in the developed laboratory conditions will be introduced.
Satyendra Nath Chakrabartty
Volume 6, Issue 1 , January 2022, Pages 17-24
Abstract
Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce ...
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Floating breakwaters are the light and low-cost types of shore protection structures that have been used in different parts of the world to create a comfort zone. Studying the performance of floating breakwaters by laboratory methods can help to design the parameters of the coastal structure and reduce the unforeseen costs in project implementation. In this study, using geometric similarity methods and Froude dimensionless numbers, two floating pontoon breakwater has been built in workshop and were affected by the three waves with different technical specifications. Furthermore, for a more extensive review of the breakwater performance, tests in three different drafts has been executed on them. Then transfer coefficients for different mentioned conditions have been evaluated and calculated and its relations with the draft and the waves were obtained. Finally, after analyzing and comparing the obtained transmission coefficients, the best breakwater in terms of performance in the developed laboratory conditions will be introduced.
Mehdi Hosseininasab; Mohammad Kasaeyan
Volume 6, Issue 1 , January 2022, Pages 25-35
Abstract
LNG (Liquefied Natural Gas) has matured rapidly as a clean fuel in the global energy market. SSLNG (Small Scale LNG) is a new method for more convenient transferring LNG from production plants to the end users. the challenge related to the SSLNG business is a relatively expensive supply chain due to ...
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LNG (Liquefied Natural Gas) has matured rapidly as a clean fuel in the global energy market. SSLNG (Small Scale LNG) is a new method for more convenient transferring LNG from production plants to the end users. the challenge related to the SSLNG business is a relatively expensive supply chain due to the absence of economies of scale. In this Study, a novel method for LNG transportation in the supply chain has been presented. the main idea of this method is to use the mobile LNG containers for exportation & importation in order to improve and facilitate the process of transportation of LNG in economical way, such as elimination of regasification units in the course of loading/offloading of LNG. Also in this paper, suitable materials for cryogenic fluid is invested and the proper size of conceptual model of mobile containers with consideration of being practical and easy handling are proposed.The multi layers arrangement for the suggested containers are Invar, Polyurethane foam and Polyamide and etc. The container sizing also has been selected equal to ISO (International Standard Organization) 40 ft size containers. A conceptual model using finite element method (FEM) for the suggested container has been created. An analysis using ABAQUS CAE 2016 Software has been applied to investigate on the conceptual container strength under periodic loads during charging and discharging containers with LNG.
Constantine Stamatopoulos
Volume 6, Issue 1 , January 2022, Pages 36-54
Abstract
The study presents practical approaches for determining appropriate, or “safe,” sample sizes for routinely conducted statistical surveys. Finite populations are considered holistically and independently of whether they are continuous, categorical, or dichotomous. It is proposed that in sampling ...
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The study presents practical approaches for determining appropriate, or “safe,” sample sizes for routinely conducted statistical surveys. Finite populations are considered holistically and independently of whether they are continuous, categorical, or dichotomous. It is proposed that in sampling surveys variance-ordered categories of populations should be the basis for calculating the safe sample size given that the variance within a target population is a primary factor in determining sample size a priori. Several justifications are presented for this thesis. Dichotomous populations are often assumed to have higher variances than continuous populations when the latter have been standardized and have all values in the interval [0 1]. Herein, it is shown that this is not a valid assumption; a significant proportion of dichotomous populations have lower variances than continuous populations. Conversely, many continuous populations have variances that exceed the limits that are broadly assumed in literature for determining a safe sample size. A simple first step is to partition finite populations into just two categories: convex and concave. These two categories are relative to a flat population with a known variance as the threshold between them. This variance is used to determine a safe sample size for any continuous population with a flat or positive curvature, including approximately 20% of dichotomous populations. For all other populations the variance of 0.25 is recommended for sample size determination. The suggested approaches have been successfully implemented in fisheries statistical monitoring programmes but it is believed that they are equally applicable to other applications sectors.
S. Eisapor; Sh. Safaeian
Volume 6, Issue 1 , January 2022, Pages 55-65
Abstract
In this study marine sponges of inter tidal zone from Hengam Island Persian Gulf were collected by wading at low tides in Eskeleh station at locations 55˚ 53ʹ 40ʺ E & 26˚ 40ʹ 53ʺ N. For identifying identification of sponge samples, acid digestion method as a method of early detection ...
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In this study marine sponges of inter tidal zone from Hengam Island Persian Gulf were collected by wading at low tides in Eskeleh station at locations 55˚ 53ʹ 40ʺ E & 26˚ 40ʹ 53ʺ N. For identifying identification of sponge samples, acid digestion method as a method of early detection and microtome section to identify the skeletal structure were used. All the identified sponges were from class Demospongia, two orders (Hadromerida, Haplosclerida) and four families (Clionidae, Callyspongidae, Chalinidae, Niphatidae) and seven species Amphimedon viridis, Haliclona rosea, Haliclona cinerea, Siphonochalina sp., Callyspongia fallax, Callyspongia sp.2, Cliona dioryssa. This Research is the exact study to the identification sponges in basis of microtome sectioning to observe skeletal structures in Iranian Island.