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  • 1
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    American Physical Society (APS)
    Publication Date: 2011-08-05
    Description: Author(s): M. H. Dehghani, R. B. Mann, and R. Pourhasan We investigate modifications of the Lifshitz black hole solutions due to the presence of Maxwell charge in higher dimensions for arbitrary z and any topology. We find that the behavior of large black holes is insensitive to the topology of the solutions, whereas for small black holes significant dif... [Phys. Rev. D 84, 046002] Published Thu Aug 04, 2011
    Keywords: String theory
    Print ISSN: 0556-2821
    Electronic ISSN: 1089-4918
    Topics: Physics
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  • 2
    Publication Date: 2014-03-06
    Print ISSN: 0001-7701
    Electronic ISSN: 1572-9532
    Topics: Physics
    Published by Springer
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  • 3
    Publication Date: 2016-10-31
    Print ISSN: 0924-090X
    Electronic ISSN: 1573-269X
    Topics: Mathematics
    Published by Springer
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  • 4
    Publication Date: 2020-08-10
    Print ISSN: 0004-6361
    Electronic ISSN: 1432-0746
    Topics: Physics
    Published by EDP Sciences
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  • 5
    Publication Date: 2021-08-20
    Print ISSN: 1735-1472
    Electronic ISSN: 1735-2630
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Springer
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  • 6
    Publication Date: 2016-01-01
    Description: By applying the unified first law of thermodynamics on the apparent horizon of FRW universe, we get the entropy relation for the apparent horizon in quasi-topological gravity theory. Throughout the paper, the results of considering the Hayward-Kodama and Cai-Kim temperatures are also addressed. Our study shows that whenever there is no energy exchange between the various parts of cosmos, we can get an expression for the apparent horizon entropy in quasi-topological gravity, which is in agreement with other attempts that followed different approaches. The effects of a mutual interaction between the various parts of cosmos on the apparent horizon entropy as well as the validity of second law of thermodynamics in quasi-topological gravity are perused.
    Print ISSN: 1687-7357
    Electronic ISSN: 1687-7365
    Topics: Physics
    Published by Hindawi
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  • 7
    Publication Date: 2021-05-19
    Description: Although studies showed that the most Phytoplankton blooms usually provide positive impacts on marine environments, but blooming of certain species of phytoplankton may also have negative impacts. In recent years there has been a growing concern of the problems associated with red tides, which may induce mass mortalities of cultured fish or shellfish, and cause damage to aquaculture industries such as prawn culture and caged fish culture. Therefore, mass blooming of harmful algae in the Persian Gulf and Oman Sea may cause unexpected damage to fish stocks (through the production of toxins, oxygen, feeding on fish eggs and primary producers) and ecosystem aquatic and fishing communities are faced with a serious problem. The aim of the present study initially was to Isolation and determine the parameters affecting the growth and booms harmful algal, determine the growth and survival of vannamei shrimp Post larve in different densities of the algae, as well as the best, safest and most effective ways to control the blooming of this group of phytoplankton (physico-chemical), respectively. In order to provide optimum growth and bloom forming according to characteristics of each species, phytoplankton was sampled during the bloom conditions in the coastal waters of Bandar Abbass, Hengam and Qeshm Islands with cleaned sampling bottles from May 2012 to June 2015. The samples were then filtered through phytoplankton net (100 µm) and poured into bottles containing 1 liter seawater and were sent to the Persian Gulf and Oman Sea Ecology Research Laboratory under cool conditions. After adaptation in filtered seawater, some species were isolated by positive phototropism characteristic. They were grown in modified media culture at different salinities (30, 32 and 35ppt), temperatures (20, 23, 26 and 28ºC) and intensities (35, 70 and 90 µmol m-2 s -1 ). During this part of study, three species of dinoflagellates, Protoperedinium sp., Noctiluca scintillans and Cochlodinium polykrikoides were identified, but we could isolate only Cochlodinium polykrikoides species. The first dinoflagellate species was Noctiluca scintillans which only survived for 4 months during several replacement of culture media (F/4) under salinity of 32 ppt, temperature of 25ºC and 11h light: 13h dark photoperiod regime. The next dinoflagellate species which formed temporary blooms was Protoperedinium sp., but was not be isolated by conventional culture media. Finally the last dinoflagellate species which we could success to isolate was Cochlodinium polykrikoides. The results of Isolation and determine the parameters affecting the growth and booms harmful algal, clearly showed that the highest alga biomass and growth rate was obtained following culture under the A2 medium, 32ppt salinity, 26°C temperature, and under at a light intensity of 90 µmol m-2 s -1 provided by cool white fluorescent tubes. Maximum cell density of C. polykrikoides in a 5 liter Erlenmeyer reached to 1.6 × 106 cell L−1 including chains of 2-12 cells and sometimes 16 cells for twenty days. Based on the results from the present study, providing suitable media culture and physical condition, bloom forming of C. polykrikoides start from day 8 to 10 and will be continued until day 24 to 28. In the other hand, C. polykrikoides cells immediately crashed and destroyed. In order to investigate the best, safest and most effective way to control of harmful algae blooms, we used physical methods (slurry clay: 0.5, 1, 2, 4 and 10 gl-1 ). The results of the physical assay showed that the growth of C.polykricoides was strongly inhibited by using clay slurry in 4 or 10 gl-1 . The removal efficiency of C. polykricoiedes by clay was 99% after 24 hours. The results of the physical assay on Protoperidinium quinquecorne showed that the growth was strongly inhibited by using clay slurry in 4 or 10 gl-1 . The removal efficiency of Protoperidinium quinquecorne by using 4 gl-1 clay was 99% and 10 gl-1 was 98 after 24 hours. However, using clay could be considered as an effective strategy to control HAB’S in the Persian Gulf coastal waters. Finally, in order to survey the effects of various densities of harmful algae on growth and survival rate of post on white leg shrimp postlarve, the vanamei shrimp postlarvae were exposed to different densities of C. polykrikoides (20000, 600000, and 2000000 cell/l) for 6 weeks culturing period. The results clearly showed that there were no significant differences between growth and survival rates of shrimp postlarvae exposed to different densities of C. polykrikoides during the experimental period.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Harmful algae blooms ; Isolation ; Cochlodinium polykrikoides ; Litopenaeus vannamei ; Clay slurry
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 69pp.
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  • 8
    Publication Date: 2021-05-19
    Description: Protecting coastal aquaculture systems as a habitat for aquatic systems is one of the serious concerns of the world. In the present study, spatial and temporal variations of Some physicochemical parameters, nutrient concentration and water quality In some estuaries of East and West of Hormozgan province were investigated from March 2015 to February 2016.Data analysis was performed using multivariate statistical methods (such as: CA,DA and PCA Analysis) and Eutrophication and water quality index using multivariable indices. The average annual variation of various parameters studied in West Azarbaijan province of Hormozgan is as follows:water temperature (18.1-34.6Co ), Salinity (35-45.6 ppt), Dissolved Oxygen (4.6-7.4 mg.l), pH (8.01-8.4), Nitrate (32.5- 403.5µmo.l), Nitrite (3.6-50.7 µmo.l), Total Ammonia (9.8-311.2 µmo.l), phosphate (22-569.1.6 µmo.l), and chlorophyll-a is equal to(0.46-4.04 mg.m3 ), respectively.Also, the mean annual variation of the various parameters studied in the eastern province of Hormozgan has been as follows: water temperature (18.1-34.6Co ), Salinity (35-45.6 ppt), Dissolved Oxygen (4.6-7.4 mg.l), pH (8.01-8.4), Nitrate (32.5-403.5µmo.l), Nitrite (3.6- 50.7 µmo.l), Total Ammonia (9.8-311.2 µmo.l), phosphate (22-569.1.6 µmo.l), and chlorophyll-a is equal to(0.46-4.04 mg.m3 ), respectively. One-Way Analysis of Variance test showed that the significant for some differences physicochemical parameters varied seasonally.Discriminant analysis, water quality conditions in terms of location classified into three groups.The analysis of PCA showed that the amount of nitrate and total ammonia in the tiba and phosphate in Laft and Kgamir Stricks with two sources (domestic and agricultural waste) and natural sources, can be considered as the main factors affecting the intensity of Eutrofication.The range of trophic Trix and TI eutrophication index in the studied areas were 4.3-6.1 and 3.5-4.2 respectively.According to on the indicators of and TI index, trophic status was classified into mesotrophic(in laft and khamir areas), Oligo-Mezotrophic(Yekshoveh area) and mezo- eutrophic respectively. Also Based on Trix index, the Water quality status was from bad condition in tiab area and good condition in laft, khamir and yekshoveh areas respectively. The determination of trophic conditions with a single-variable method based on chlorophyll a and Total inorganic Dissolved materials(DIN) showed a Very good agreement with multivariate trophic indices.The range of changes in some of the parameters studied in this study was more than the reported limit for the conservation of aquatic life in coastal areas.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Environmental ; Shrimp ; Habitats
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 76pp.
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  • 9
    Publication Date: 2021-05-19
    Description: This project was carried out from November 2008 for about two years. Seven laboratories of the research center including: Chromatography, Instrumental Analysis, Aquatic zoology, Sample preparation, Histology, Plankton and Benthos were selected for the accreditation. The quality manual of the test laboratories was written following the general requirements of ISO/IEC 17025. During the establishment of the system standardization of the test methods, calibration of the equipment, test methods validation, uncertainty estimation of measurement and update and improvement of physical conditions of the laboratories were performed. The technical and quality management competence of the laboratories were evaluated by the auditors from DGA (the German Accreditation System for Testing Laboratories), which is signatory of ILAC (International Laboratory Accreditation Co-operation). The laboratories officially accredited by DGA, after the successful completion of the accreditation process (including implementation of corrective actions for the detected nonconformities). The accreditation is valid from 2009-11-12 to 2014-11-11. Production of reliable results of the test methods from national and international scientific organizations' point of view as well as facilitation in development of bilateral and multilateral relations with them can be considered as the advantages of the system establishment. Moreover, exchange of the relevant scientific information and experiences among the researchers will be facilitated.
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Keywords: Ecology ; Histology ; Physical ; ISO 17025:2005 ; Testing Laboratories ; Calibration ; Accreditation ; Chromatography ; Instrumental Analysis ; Aquatic ; Plankton ; Benthos ; ISO 17025 ; ISO 2005
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 80pp.
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  • 10
    Publication Date: 2021-05-19
    Description: Iranian Fisheries Science Research Institute
    Description: Published
    Repository Name: AquaDocs
    Type: Report , Refereed
    Format: 126pp.
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