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  • 1
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    The effect of different dietary protein and lipid levels on growth performance in Caspian Kutum (Rutilus frisii kutum, Kamensky, 1901) (2017)
    Details
    Publication Date: 2021-05-19
    Description: A feeding trial with three protein levels (30, 35 and 40%) and three lipid levels (10, 12 and 14%) was conducted to evaluate the optimum protein and lipid ratio of Caspian Kutum (Rutilus frisii kutum). Six hundred and seventy five fish (1.15±0.01g; mean ±SD) were randomly distributed in 27 aquaria (45L) and were fed four times daily for 8 weeks. Results showed that interaction between protein and lipid did not significantly affect the growth parameters. Weight increased with increasing dietary protein level up to 35%, and then decreased significantly. Specific growth rate (SGR) and average daily growth (ADG) of fish fed the diets containing 35 and 40% protein increased with increasing lipid level, but protein efficiency ratio (PER) of fish decreased with increasing dietary protein level. Fish fed the diet containing 40% protein and 10% lipid showed the lower protein productive value (PPV). Lipid efficiency ratio (LER) of fish fed the diets containing 30 and 35% protein decreased significantly with increasing lipid level (p〈 0.05). Lipid production value (LPV) of fish fed the 35% protein and 10% lipid was higher than those of other treatments. Results regarding to the analysis of body compositions showed that dietary protein levels made no significant differences among treatments, but the increase of lipid level in diets led to fish body lipid increase and the highest amount of lipid were observed in fingerlings fed 35% protein and 14% lipid. Survival was 100% in all treatment. In conclusion, it appears that Caspian Kutum juveniles could adapt to 14% dietary lipid without negative effects on growth and the diet containing 35% protein with 14% lipid would be suitable for optimum growth of Caspian Kutum in the studied weight range.
    Description: Published
    Keywords: Cyprinidea ; Rutilus frisii kutum ; Caspian Kutum ; Fish culture ; Growth ; Feeding ; Levels ; Protein ; Dietary
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.101-116
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  • 2
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    The effect of different dietary protein and lipid levels on growth performance in Caspian Kutum (Rutilus frisii kutum, Kamensky, 1901) (2021)
    In:  http://aquaticcommons.org/id/eprint/21941 | 18721 | 2018-01-17 12:54:55 | 21941 | Iranian Fisheries Science Research Institute
    Details
    Publication Date: 2021-07-05
    Description: A feeding trial with three protein levels (30, 35 and 40%) and three lipid levels (10, 12 and 14%) was conducted to evaluate the optimum protein and lipid ratio of Caspian Kutum (Rutilus frisii kutum). Six hundred and seventy five fish (1.15±0.01g; mean ±SD) were randomly distributed in 27 aquaria (45L) and were fed four times daily for 8 weeks. Results showed that interaction between protein and lipid did not significantly affect the growth parameters. Weight increased with increasing dietary protein level up to 35%, and then decreased significantly. Specific growth rate (SGR) and average daily growth (ADG) of fish fed the diets containing 35 and 40% protein increased with increasing lipid level, but protein efficiency ratio (PER) of fish decreased with increasing dietary protein level. Fish fed the diet containing 40% protein and 10% lipid showed the lower protein productive value (PPV). Lipid efficiency ratio (LER) of fish fed the diets containing 30 and 35% protein decreased significantly with increasing lipid level (p〈 0.05). Lipid production value (LPV) of fish fed the 35% protein and 10% lipid was higher than those of other treatments. Results regarding to the analysis of body compositions showed that dietary protein levels made no significant differences among treatments, but the increase of lipid level in diets led to fish body lipid increase and the highest amount of lipid were observed in fingerlings fed 35% protein and 14% lipid. Survival was 100% in all treatment. In conclusion, it appears that Caspian Kutum juveniles could adapt to 14% dietary lipid without negative effects on growth and the diet containing 35% protein with 14% lipid would be suitable for optimum growth of Caspian Kutum in the studied weight range.
    Keywords: Aquaculture ; Biology ; Fish culture ; Growth ; Feeding ; Cyprinidea ; dietary ; protein ; lipid ; levels ; performance ; Caspian Kutum ; Rutilus frisii kutum ; Iran
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 101-116
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  • 3
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    Feeding strategy analysis of blue swimming crab (Portunus pelagicus, Linnaeus, 1758) using Castello's graphical model in Khuzestan coastal water (2018)
    Details
    Publication Date: 2021-05-19
    Description: Feeding strategy of blue swimming crab (Portunus pelagicus) was investigated monthly in Khuzestan province water from April-2016 to march-2017. Samples were catch by trawl net. The content of P. pelagicus stomachs, percentage of occurrence frequency and Frequency percentage of feeding items was checked. In crab stomachs different feeding items group such as crustacean, mollusks, sponges, phytoplanktons, corals, fish, sand particles and etc. Was observed. The highest frequency of occurrence belonging to sponges, crustaceans and mollusks, respectively. Furthermore, Frequency percentage of sponges (38.65%) was higher than other preys. Costello's graphical model analysis Results analysis of P. pelagicus stomach content by Costello's model showed that this crab is a predator with specific feeding nich and feeding specific prey include sponges, crustacean and mollusks during a year. Though, it's feeding pattern show few seasonally fluctuations. In this model, phytoplanktons, fish, polycheats, corals, nematode, protista, ctenophore, nematodes, cestod, sea insects and sand identified as accidental or rare prey. Probably, ingest by crab while feeding from specific prey.
    Description: Published
    Keywords: Feeding ; Blue swimming crab ; Portunus pelagicus ; Coastal water ; Prey importance ; Feeding items ; Frequency percentage ; Frequency of occurrence ; Phytoplanktons ; Corals ; Fish
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed
    Format: pp.37-46
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  • 4
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    High pressure water jet cutting and stripping (1991)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: High pressure water cutting techniques have a wide range of applications to the American space effort. Hydroblasting techniques are commonly used during the refurbishment of the reusable solid rocket motors. The process can be controlled to strip a thermal protective ablator without incurring any damage to the painted surface underneath by using a variation of possible parameters. Hydroblasting is a technique which is easily automated. Automation removes personnel from the hostile environment of the high pressure water. Computer controlled robots can perform the same task in a fraction of the time that would be required by manual operation.
    Keywords: MECHANICAL ENGINEERING
    Type: National Aeronautics and Space Administration, Technology 2000, Volume 1; p 214-220
    Format: application/pdf
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  • 5
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    Design of a hydraulic actuator for active control of rotating machinery (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A hydraulic actuator is described which consists of a pump, a hydraulic servo-valve, and a thin elastic plate which transduces the generated pressure variations into forces acting on a mass which simulates the bearing of a rotor system. An actuator characteristic number is defined to provide a base for an optimum design of force actuators with combined weight, frequency, and force considerations. This characteristic number may also be used to compare hydraulic and electromagnetic force actuators. In tests, this actuator generated 182.3 Newton force at a frequency of 100 Hz and a displacement amplitude of 5.8 x 10 exp -5 meter.
    Keywords: MECHANICAL ENGINEERING
    Type: ASME PAPER 91-GT-246
    Format: text
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  • 6
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    Vibration Analysis of a Split Path Gearbox (1995)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Split path gearboxes can be attractive alternatives to the common planetary designs for rotorcraft, but because they have seen little use, they are relatively high risk designs. To help reduce the risk of fielding a rotorcraft with a split path gearbox, the vibration and dynamic characteristics of such a gearbox were studied. A mathematical model was developed by using the Lagrangian method, and it was applied to study the effect of three design variables on the natural frequencies and vibration energy of the gearbox. The first design variable, shaft angle, had little influence on the natural frequencies. The second variable, mesh phasing, had a strong effect on the levels of vibration energy, with phase angles of 0 deg and 180 deg producing low vibration levels. The third design variable, the stiffness of the shafts connecting the spur gears to the helical pinions, strongly influenced the natural frequencies of some of the vibration modes, including two of the dominant modes. We found that, to achieve the lowest level of vibration energy, the natural frequencies of these two dominant modes should be less than those of the main excitation sources.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-106875 , E-9498 , NAS 1.15:106875 , ARL-TR-723 , AIAA PAPER 95-3048 , Joint Propulsion Conference; Jul 10, 1995 - Jul 12, 1995; San Diego, CA; United States
    Format: application/pdf
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  • 7
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    Dynamics of a split torque helicopter transmission (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A high reduction ratio split torque gear train has been proposed as an alternative to a planetary configuration for the final stage of a helicopter transmission. A split torque design allows a high ratio of power-to-weight for the transmission. The design studied in this work includes a pivoting beam that acts to balance thrust loads produced by the helical gear meshes in each of two parallel power paths. When the thrust loads are balanced, the torque is split evenly. A mathematical model was developed to study the dynamics of the system. The effects of time varying gear mesh stiffness, static transmission errors, and flexible bearing supports are included in the model. The model was demonstrated with a test case. Results show that although the gearbox has a symmetric configuration, the simulated dynamic behavior of the first and second compound gears are not the same. Also, results show that shaft location and mesh stiffness tuning are significant design parameters that influence the motions of the system.
    Keywords: MECHANICAL ENGINEERING
    Type: NASA-TM-105681 , E-7060 , AVSCOM-TR-91-C-043 , NAS 1.15:105681 , AD-A257375 , International Power Transmission and Gearing Conference; Sep 13, 1992 - Sep 16, 1992; Scottsdale, AZ; United States
    Format: application/pdf
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