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  • 1
    facet.materialart.
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    In:  http://aquaticcommons.org/id/eprint/17830 | 12051 | 2015-09-16 00:27:59 | 17830 | Bangladesh Fisheries Research Institute
    Publication Date: 2021-06-30
    Description: The effect of sodium lactate is compared with sucrose + sorbitol + sodium tri-poly phosphate as cryoprotectant on gel forming ability & protein denaturation of croakersurimi during frozen storage at -20±2°C for 90 days was evaluated. The quality of Croaker surimi with 6% (w/v) sodium lactate was examined in terms of biochemicalparameters of muscle protein, thaw drip, gel strength and calcium ATPase activity :.omparing with those of surimi added with sucrose/sorbitol & without additive as control. Both the cryoprotectants minimized the negative effects of frozen storage on physico-chemical traits of myofibrillar proteins which was evident from the biochemical and sensory parameters. The residual Ca2+ ATPase activity and gel strength of surimi with sodium lactate were higher than those of control throughout 90 days of storage.Ca2+ A TPase activity and gel strength found a high positive correlation. From the results, it was found that sodium lactate was equally effective in preservation of croaker muscle protein native structure during frozen storage as the sucrose/ sorbitol and also less sweet without any risk of maillard browning.
    Keywords: Aquaculture ; Biology ; Gel forming ability ; Sodium lactate ; Cryoprotectant ; Frozen storage
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 211-221
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  • 2
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    In:  http://aquaticcommons.org/id/eprint/17841 | 12051 | 2015-09-16 00:31:43 | 17841 | Bangladesh Fisheries Research Institute
    Publication Date: 2021-06-30
    Description: Pieces of catla fish (Catla catla, a major carp of lndian subcontinent) of length 10 to 11 cm and thickness 1.0 to 1.5cm were precooked by two methods; steam precooking andfrying. The precooked pieces were packed_in No.1 tall can (30lx411) with various hot filling media like oil, brine, tomato sauce and curry. Cans were seamed by a hand seamerand retorted at 117.2° C (12 psi) for 90 minutes. All the canned products had satisfactory cut-out, biochemical and organoleptic characteristics. Steam precooked canned products had moisture content of 65.6 to 74%, protein content of 20.8 to 22%, fat content of 1.1 to 6.6% and ash content of 2.1 to 2.5%; whereas fried canned products had moisture content of 65.4 to 68.2%, protein content of 21.3 to 22%, fat content of 7 to 10.2% and ash content of 2.1 to 2.7% on wet wt. basis. Salt content in steam precooked and fried canned products varied from 1.2 to 1.9% and 2.0 to 2.5% respectively. All the canned products were organoleptically good. However, degree of preference varied for different products. Canned fried catla in curry was the best product among all types of packs.Among the precooking methods, frying was more efficient than steam precooking in controlling the amount of exudate to a desirable limit in canned products. However, crispness, the characteristic quality for a fried fish, was lost during retorting. There was no change in quality characteristics during a storage period of 3 months at ambient temperature (32±2°C).
    Keywords: Aquaculture ; Biology ; Canned products ; Biochemical characteristic ; Catla catl
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 223-228
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 6046-6048 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nd-Fe-B permanent magnets prepared by rapid solidification have been extensively characterized by transmission electron microscopy at all stages of their development. Grains in the as-spun ribbons range in size up to several micrometers in their largest dimension. Excess Nd is trapped within some of the larger grains during solidification; this excess Nd separates from the lattice during subsequent processing, forming Nd-rich, coherent, precipitates. During consolidation of the ribbons, the surface oxide films are broken, creating intimate metallurgical bonds and allowing grain growth to occur across the original ribbon interfaces. The bulk of the grains in the final magnet are plate shaped, having a c axis in common and parallel to the axis of die upsetting; these grains are surrounded by the Nd-rich grain-boundary phase.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 6476-6478 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report a direct determination of the Zr site in pseudoternary alloys with a nominal composition of Nd1.6Zr0.4Fe14B using extended x-ray absorption fine structure (EXAFS). Comparing the Zr EXAFS from these alloys to the Y EXAFS from Y2Fe14B and the Fe EXAFS from Nd2Fe14B reveals that the local Zr and Y environments are nearly identical, and quite disparate from the Fe environment. This finding, and results from x-ray diffraction and electron microscopy, lead to the conclusion that Zr is incorporated as a substituent for Nd in the Nd2Fe14B structure.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 676-679 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Using x-ray-absorption near-edge spectroscopy (XANES) the Pr valence in the pseudoternary Pr2(CoxFe1−x)14B compounds has been directly determined. Praseodymium LIII edge XANES structures were obtained for the x=0, 0.3, 0.5, 0.7, and 1 compositions spanning the entire Co concentration range. It is found that the Pr valence is constant through the series and is identical to that in formally trivalent praseodymium acetate. The results demonstrate that the anomalous variation of the magnetocrystalline anisotropy with x in the Pr2(CoxFe1−x)14B compounds vis-à-vis their Nd-based counterparts does not arise from a Pr valence instability, as has been speculated in the literature, but must originate elsewhere. For comparison purposes XANES spectra for some relevant Ce and Nd materials are also reported.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6603-6605 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The high (BH)max potential of Nd-Fe-B materials make them excellent candidates for bonded magnets. We have previously shown that anisotropic bonded magnets can be made from hot deformed rapidly solidified materials. The purpose of this paper is to show how hot deformed materials can be pulverized into desired particle size ranges by using specific hydrogen decrepitation (HD) cycles. Specific temperatures for hydriding and desorbing cycles to achieve desired particle size ranges and magnetic values are given. The data shows that there are optimum times and temperatures to achieve the desired magnetic properties. TEM and SEM photomicrographs of mechanically and HD pulverized materials are shown. TEM studies show that stacking faults generated during HD are relieved after desorption. With proper control of HD and desorption, bonded magnets have been produced having (BH)max values as high as 18.9 MGOe.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have explored the impact of low-level Cu additions on the magnetic properties of melt-spun Nd-Fe-B ribbons. The addition of 0.5 at. % Cu enhances the intrinsic coercivity as much as 30% over that of Cu-free materials. Transmission electron microscopy analyses demonstrate that Cu segregates preferentially to the intergranular regions.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 70 (1991), S. 6037-6037 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The discovery that nitriding Sm2Fe17 greatly enhances its Curie temperatures and the magnetic anisotropy, making it potentially attractive for permanent magnet applications, has intensified research efforts to understand the physical and chemical properties of this material. In this work we have combined x-ray diffraction, x-ray absorption near edge structure (XANES), and extended x-ray absorption fine structure (EXAFS) to determine the position and valence of the nitrogen atoms in the expanded Sm2Fe17 lattice following nitriding. The XANES from the Sm L3 edge and Fe K edge of Sm2Fe17 before and after nitriding reveals that the valences of both Sm and Fe are unchanged. This implies that the nitrogen is incorporated covalently into this material, i.e., there is no net charge transfer between the N atoms and the Sm or Fe. From the observed changes in the Sm EXAFS, we determine the changes in the local Sm environment produced by nitriding. It is determined that in Sm2Fe17Nx there are 2.8±1.0 nitrogen atoms at a distance of 0.254 nm from the Sm site. X-ray diffraction patterns of the Sm2Fe17 before and after nitriding show the original Th2Zn17 lattice expands such that c and a lattice parameters change from 1.2435 and 0.8548 nm to 1.2639 and 0.8731 nm, respectively. The above valence, coordination number, Sm-N distance, and lattice parameters are consistent with N atoms occupying the 9(e) interstitial sites of the expanded lattice.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 75 (1994), S. 4208-4213 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In order to optimize the magnetic properties of die-upset Pr-Fe-B magnets, we have systematically altered alloy compositions, including partial substitution of cobalt and neodymium, and low-level additions of gallium. In general, the remanences of Pr-Fe-B die-upset magnets were lower by ∼1 kG, and coercivities were higher by ∼4 kOe, than analogous Nd-Fe-B magnets. The microstructure of the Pr-Fe-B die-upset magnets was similar to Nd-Fe-B magnets. Both systems are two phase, consisting of oriented flat platelet-shaped grains of 2-14-1 separated by a rare earth-rich intergranular phase. The intergranular phase is thicker for the Pr-Fe-B magnets, resulting in enhanced magnetic domain wall pinning and increased coercivity. Even higher coercivities were obtained with small amounts of cobalt substitution (≤5 at. % of the transition metal) and by very low-level additions of gallium (≤0.5 at. %). The largest remanence (Br=13.7 kG) for a Pr-based 75% die-upset magnet was obtained with the alloy (R13TM81B6)0.9975Ga0.25, where R=(Pr0.8Nd0.2) and TM=(Fe0.95Co0.05).
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 76 (1994), S. 6301-6303 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: With the object of assessing their magnetocaloric properties, we have prepared GdxAg100−x alloys (x=50, 70, 75, 77.5, 80, 100) by melt spinning. The microstructures of the melt-spun ribbons were investigated by x-ray diffraction and transmission electron microscopy. Data from field- and temperature-dependent magnetization measurements were used to calculate the field-induced entropy change ΔS. The Gd-only ribbons are characterized by a single ΔS peak near 280 K. For the GdxAg100−x (70≤x≤80) materials ΔS contains another peak in the 100–120 K range which we ascribe to an amorphous, ferromagnetic Gd-Ag component. We find melt-spun Gd50Ag50 ribbons to consist primarily of crystalline GdAg (cubic CsCl structure), which is antiferromagnetic.
    Type of Medium: Electronic Resource
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