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Mansoori M.,Khorramshahr Marine Science and Technology University | Fernandes A.C.,Federal University of Rio de Janeiro
Ocean Engineering | Year: 2017

Trim tabs, small surfaces connected to the end of the craft to control the trim by adjusting the angle of tab, relative to the larger surface, have been used to optimize the running trim of displacement, semi-planning, and planning vessels for many years. Interceptors are the same as trim tabs, but are vertically installed at the end of the craft to control the trim by changing the height. As demonstrated in this paper, the same size as the interceptor and trim tab (when span and chord of trim tab are respectively equal to span and height of interceptor), the interceptor shows better efficiency (better trim and resistance reduction). While efficiency of trim tab just depends on the trim tab angle, the effective factors on the interceptor effectiveness are little complicated. The interceptor efficiency highly depends on the interceptor height and boundary layer thickness at transom. Although the higher interceptor increases the amount of lift force, but that could create a very strong moment against trim moment and consequently negative trim angle. The results of this investigation prove that the combination of an interceptor with a trim tab shows better performance compared to an interceptor or a trim tab. Also instead of increasing the interceptor height to gain more lift, which could make intense negative trim, it is better to use integrated interceptor with trim tab. To do so, a comprehensive series of dynamic CFD simulations have been performed in the case of a simple planning boat model with three different trim control appendages. Unsteady Reynolds Average Navier-Stokes equations (URANS) are applied to model the flow around the considered model with interceptor, trim tab and combination of an interceptor and a trim tab at an equal span length. The model is analyzed based on finite volume method and SIMPLE algorithm using dynamic meshes in the Fluent computational code. For validation of the CFD results, the Savitsky planning boat calculations (only for model boat) and the grid convergence index (GCI) were used to estimate the uncertainties due to grid-spacing and time-step. © 2017 Elsevier Ltd

Larki A.,Khorramshahr Marine Science and Technology University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2017

In this work, the intrinsic colorimetric property of carbon dots (CDs) was utilized for the determination of fenitrothion by applying dispersive liquid-liquid microextraction (DLLME) method. Label free CDs are extracted into carbon tetrachloride via assistance of trioctylmethylammonium chloride (Aliquat 336), which also acts as a disperser agent in this technique. The enriched CDs show an absorption signal at 365 nm, which increases in the presence of fenitrothion. The absorbance increase of CDs in organic phase was used as an analytical signal for the determination of fenitrothion. The synthesized CDs were characterized by UV–visible, fluorescence, Fourier transform infrared (FT-IR) and transmission electron microscopic (TEM). Under the optimized conditions, beer's law was obeyed in the range of 1.0–250.0 ng mL− 1 of fenitrothion with the limit of detection for fenitrothion was 0.2 ng mL− 1. The relative standard deviation for eight replicate measurements of fenitrothion at concentrations of 25 and 100 ng mL− 1 were calculated to be 1.5 and 3.7%, respectively. The proposed method was successfully applied in the determination of fenitrothion in water samples with satisfactory results. © 2016

Shiralipour R.,Ahvaz Jundishapur University of Medical Sciences | Larki A.,Khorramshahr Marine Science and Technology University
Ecotoxicology and Environmental Safety | Year: 2017

In this study, a new absorbent based on cellulose nanosponges modified with methyltrioctylammonium chloride (aliquat 336) was prepared and used for pre-concentration, removal and determination of tartrazine dye, using UV–vis spectrophotometry. This adsorbent was fully characterized using various instrumental techniques such as SEM, FTIR and XRD spectra. The pre-concentration and removal procedures were studied in column and batch modes, respectively. The effects of parameters such as pH of the aqueous medium, methyltrioctylammounium chloride dose, adsorbent amount, desorbing conditions and interfering ions on the adsorption of tartrazine were investigated and optimized. The fitting experimental data with conventional isotherm models revealed that the adsorption followed the Brunauer-Emmett-Teller (BET) model and the maximum adsorption capacity for tartrazine was 180 mg/g with modified nanosponges. Under the optimized conditions, the calibration curve was linear over the range of 2–300 ng/mL and the limit of detection was 0.15 ng/mL. The relative standard deviation (RSD) for 20 and 100 ng/mL of tartrazine were 3.1% and 1.5%, respectively. The proposed method was applied for pre-concentration and determination of tartrazine dye in different water samples. © 2016 Elsevier Inc.

Naderi M.,Khorramshahr Marine Science and Technology University | Wong M.Y.L.,University of Wollongong | Gholami F.,Islamic Azad University at Yasuj
Aquatic Toxicology | Year: 2014

In the recent years, there has been a growing concern about the production and use of bisphenol-A substitute, namely bisphenol-S (BPS). Due to its novel nature, there have been few studies addressing the ability of BPS to disrupt the endocrine system of animals. In the present study, zebrafish (Danio rerio) embryos were exposed to and reared in various concentrations of BPS (0, 0.1, 1, 10 and 100. μg/l) for 75 days. Then adult males and females were paired in spawning tanks for 7 days in clean water and the consequent effects on fish development, reproduction, plasma vitellogenin (VTG), sex steroids and thyroid hormone levels were investigated as endpoints. After 75 days of exposure, there was a skewed sex ratio in favor of females. The results also showed that body length and weight significantly decreased in males exposed to 100. μg/l of BPS. Gonadosomatic index was significantly reduced in fish at ≥10. μg/l. Hepatosomatic index exhibited a significant increase in both male and female fish. At ≥1. μg/l of BPS, plasma 17β-estradiol levels were significantly increased in both males and females. However, plasma testosterone showed a significant reduction in males exposed to 10 and 100. μg/l of BPS. A significant induction in plasma VTG level was observed in both males and females at ≥10. μg/l of BPS. Plasma thyroxine and triiodothyronine levels were significantly decreased at 10 and 100. μg/l of BPS in males, and at 100. μg/l in females. Egg production and sperm count were also significantly decreased in groups received 10 and 100. μg/l of BPS. Moreover, once time to hatching and hatching rates were calculated for fertilized eggs the postponed and decreased rates of hatching were observed. Taken together, these results suggest that developmental exposure to low concentrations of BPS has adverse effects on different parts of the endocrine system in zebrafish. © 2014.

Keyvanshokooh S.,Khorramshahr Marine Science and Technology University | Gharaei A.,University of Zabol
Aquaculture Research | Year: 2010

The availability of monosex populations of caviar-producing female sturgeon would considerably enhance the economic viability of domestic caviar production systems. However, it is not possible to distinguish males from females by morphological characters at larval, juvenile and even adult stages. The mechanism of sex determination in sturgeons is poorly understood, and to date no sex-specific markers in sturgeon have been reported. This review concentrates on the methodologies used to elucidate the mode of sex determination in sturgeon species and provides information on the molecular tools used to determine genetic sex markers. © 2010 The Authors. Journal Compilation © 2010 Blackwell Publishing Ltd.

Azarm H.M.,Khorramshahr Marine Science and Technology University | Lee S.-M.,Gangneung - Wonju National University
Aquaculture Research | Year: 2014

A feeding trial was conducted to evaluate the effect of replacing fish meal protein with fermented soybean meal (FSM) on the growth performance, feed utilization, amino acid profile, body composition, morphological parameters, activity of antioxidant and digestive enzymes of black sea bream (Acanthopagrus schlegeli) juvenile. Five isonitrogenic and isolipidic diets were prepared with levels of 0 (control), 80, 160, 240 and 320 g kg-1 FSM. Triplicate groups (40 fish per tank) of juvenile black sea bream with initial weight of 1.17 ± 0.04 g were hand-fed to visual satiation at three meals per day for 8 weeks. The fish fed diets containing different levels of FSM had no significant differences regarding survival and specific growth rate compared with control group. Feed and protein efficiency ratios of fish fed diet containing 320 g kg-1 FSM were significantly lower than those of control group. Daily feed intake and daily protein intake of fish fed diet containing 240-320 g kg-1 were significantly higher than those of control group. Hepatosomatic index and condition factor of fish were not affected by different dietary FSM level. Fish fed diets containing 240-320 g kg-1 FSM had significantly higher visceral somatic index than control group. Whole body proximate and amino acid compositions of fish were not affected by dietary FSM level. The activity of digestive enzymes in the intestine was not affected by dietary FSM level. The activity of glutathione peroxidase in liver was significantly higher for fish fed the diet containing 160 g kg-1 FSM compared with control group. This study showed that up to 40% fish meal in the diets of juvenile black sea bream could be replaced by fermented soybean meal with supplementation of methionine, lysine and taurine. © 2012 John Wiley & Sons Ltd.

Karimi-Maleh H.,Kerman Graduate University of Technology | Biparva P.,Sari University of Agricultural Sciences and Natural Resources | Hatami M.,Khorramshahr Marine Science and Technology University
Biosensors and Bioelectronics | Year: 2013

A carbon paste electrode (CPE) modified with (9, 10-dihydro-9, 10-ethanoanthracene-11, 12-dicarboximido)-4-ethylbenzene-1, 2-diol (DEDE) and NiO/CNTs nanocomposite was used for the sensitive voltammetric determination of cysteamine (CA), nicotinamide adenine dinucleotide (NADH) and folic acid (FA) for the first time. The synthesized materials were characterized with different methods such as XRD, cyclic voltammetry, electrochemical impedance spectroscopy (EIS) and square wave voltammetry (SWV). The modified electrode exhibited a potent and persistent electron mediating behavior followed by well-separated oxidation peaks of CA, NADH and FA. The peak currents were linearly dependent on CA, NADH and FA concentrations using square wave voltammetry (SWV) method in the ranges of 0.01-250, 1.0-500, and 3.0-550μmolL-1, with detection limits of 0.007, 0.6, and 0.9μmolL-1, respectively. The modified electrode was used for the determination of CA, NADH and FA in biological and pharmaceutical samples. © 2013 Elsevier B.V.

Keyvanshokooh S.,Khorramshahr Marine Science and Technology University | Tahmasebi-Kohyani A.,Khorramshahr Marine Science and Technology University
Aquaculture | Year: 2012

A feeding study was conducted to determine the effect of dietary nucleotides (NT) on growth performance and muscle proteome profile of rainbow trout fingerlings. Five experimental diets according to different levels of supplemented nucleotides (0, 0.05, 0.1, 0.15 and 0.2%) were assayed in rainbow trout for 8 weeks. Each diet was randomly allocated to triplicate groups of fish with initial average weight of approximately 23. g. The percentage of body weight gain (WG) and feed efficiency (FE) of fish were better when the fish were fed 0.15-0.2% diets. At the end of feeding trial, fish fed the basal and 0.2% diets were subjected to proteomic analysis. Proteins of the muscle tissue were analyzed using two-dimensional electrophoresis and MALDI-TOF/TOF mass spectrometry. Dietary NT caused differential expression of muscle metabolic proteins including glyceraldehyde-3-phosphate dehydrogenase, creatine kinase, adenylate kinase, nucleoside diphosphate kinase, and triosephosphate isomerase. In addition to metabolic enzymes, troponin-T-1 as a structural protein was found to increase in abundance in the treated fish. The altered expression of both metabolic and structural proteins in fish fed NT may be related to higher growth rate in rainbow trout. These findings provide basic information to understand possible mechanisms of dietary NT contribution to better growth in rainbow trout. © 2011 Elsevier B.V.

Ghanemi K.,Khorramshahr Marine Science and Technology University | Nikpour Y.,Khorramshahr Marine Science and Technology University | Omidvar O.,Khorramshahr Marine Science and Technology University | Maryamabadi A.,Khorramshahr Marine Science and Technology University
Talanta | Year: 2011

The application of sulfur-nanoparticle-loaded alumina as an efficient adsorbent for the solid-phase extraction (SPE) and determination of trace amounts of Cd, Cu, Zn, and Pb ions was investigated in marine samples using flame atomic absorption spectrometry (FAAS). The nanometer-sized sulfur particles were synthesized in situ, physically loaded onto alumina microparticles, and the parameters influencing the preconcentration of the analytes, such as the pH, solution flow rate and volume, eluent solution, and interfering ions, were examined. The results showed that the optimal conditions for quantitative recovery of the metal ions by adsorption and elution on the sulfur nanoparticles (SNPs) was achieved by employing a flow rate of 15 mL min-1, a pH of 8.5 for the sample solutions, and an eluent composed of 3.0 mol L-1 HNO3 in methanol. The detection limits of this method for Cd, Zn, Cu, and Pb ions were 0.30, 0.21, 0.24, and 0.63 μg L-1 (n = 10), respectively. Application of the proposed method to the analysis of fish certified reference material (DORM-3) produced results that were in good agreement with the certified values. The proposed method was also successfully applied to the determination of analytes in marine samples, including seawater, fish, and oysters. © 2011 Elsevier B.V. All rights reserved.

Habibi E.,Khorramshahr Marine Science and Technology University | Ghanemi K.,Khorramshahr Marine Science and Technology University | Fallah-Mehrjardi M.,Khorramshahr Marine Science and Technology University | Dadolahi-Sohrab A.,Khorramshahr Marine Science and Technology University
Analytica Chimica Acta | Year: 2013

A novel and efficient digestion method based on choline chloride-oxalic acid (ChCl-Ox) deep eutectic solvent (DES) was developed for flame atomic absorption spectrometry (FAAS) determination of Cu, Zn, and Fe in biological fish samples. Key parameters that influence analyte recovery were investigated and optimized, using the fish protein certified reference material (CRM, DORM-3) throughout the procedure. In this method, 100mg of the sample was dissolved in ChCl-Ox (1:2, molar ratio) at 100°C for 45min. Then, 5.0mL HNO3 (1.0M) was added. After centrifugation, the supernatant solution was filtered, diluted to a known volume, and analyzed by FAAS. Under optimized conditions, an excellent agreement between the obtained results and the certified values was observed, using Student's t-test (P=0.05); the extraction recovery of the all elements was greater than 95.3%. The proposed method was successfully applied to the determination of analytes in different tissues (muscle, liver, and gills) having a broad concentration range in a marine fish sample. The reproducibility of the method was validated by analyzing all samples by our method in a different laboratory, using inductively coupled plasma optical emission spectrometry (ICP-OES). For comparison, a conventional acid digestion (CAD) method was also used for the determination of analytes in all studied samples. The simplicity of the proposed experimental procedure, high extraction efficiency, short analysis time, lack of concentrated acids and oxidizing agents, and the use of safe and inexpensive components demonstrate the high potential of ChCl-Ox (1:2) for routine trace metal analysis in biological samples. © 2012 Elsevier B.V.

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