43 research outputs found
Feni closure dam, final design report
No full textOverview report of the final design of the Feni closure dam in Banglades
The Feni-river closure dam reviewed
No full textThe subject of this study is the Feni River Closure Dam in Bangladesh, which was designed in 1983 and subsequently built in 1985. In this final report the influence is analyzed of advanced design methods, which have become available since 1983, on the geometric dam profile and sea side slope protection. For this purpose the Feni dam was redesigned using these advanced design techniques. First the methods used for the original design were analyzed, with regard to the geometric profile and sea side slope protection. Subsequently the Feni dam was redesigned, using advanced design methods and considering the afore mentioned items. Contrary to the original design, the distinction between monsoon and cyclone conditions was made, because of the different character of both hydraulic situations. As a result of the closure of the Feni river by means of the Feni dam, a huge area downstream of the dam has accreted. The geometric redesign and structural redesign of the slope protection was carried out twice: With and without accretion influence. In this way, the influence of a hypothetical method to predict the morphological process, which was not available at the time the original design was originally made, is demonstrated. In order to derive the hydraulic loading conditions first the water levels were analyzed. The influence of the accretion process on the water levels near the dam was assumed to be zero. By analyzing gauge readings near the dam site, a probability distribution for water levels during monsoon conditions was derived. The probability distribution of water levels for cyclone conditions was obtained by means of a numerical storm surge model. After calibrating this model, 40 synthetic situations were derived, of which the probability of occurrence could be derived from the meteorological cyclone record since 1900. By computing the maximum water levels for these 40 situations and by means of relations between gauge stations the probability distribution for cyclone conditions near the Feni dam could be obtained. For the wave climate the influence of the accretion process is not negligible. As no wave observations have been carried out in the neighbourhood of the Feni dam, again a numerical model was used. By means of a wave hindcast model, the wave climate could be estimated during cyclones and monsoon winds and for the two cases: with or without accretion influence. It was found out that the wave height 3 years after closure was about 10 to 20% lower than at the time of closure for the same probability of exceedance. This effect is caused by the accretion of the fore shore.Hydraulic EngineeringCivil Engineering and Geoscience
Report on the construction of the Feni river closure dam
No full textDescription of the construction of the Feni closure dam in Banglades
Study into multi-purpose operation of Feni reservoir, Bangladesh: Low head hydro power in an irrigation project
No full textThe subject is to find out how the surplus water of an irrigation project can be used for the production of hydropower. The irrigation project is the Muhuri irrigation project, lower reaches of the Feni river, near Sandwip island, Bangladesh. The objectives of the Muhuri project is to provide water in the dry season.Hydraulic EngineeringCivil Engineering and Geoscience
Control of Mooij correlations at the nanoscale in the disordered metallic Ta–nanoisland FeNi multilayers
No full text© 2020, The Author(s). Localisation phenomena in highly disordered metals close to the extreme conditions determined by the Mott-Ioffe-Regel (MIR) limit when the electron mean free path is approximately equal to the interatomic distance is a challenging problem. Here, to shed light on these localisation phenomena, we studied the dc transport and optical conductivity properties of nanoscaled multilayered films composed of disordered metallic Ta and magnetic FeNi nanoisland layers, where ferromagnetic FeNi nanoislands have giant magnetic moments of 103–105 Bohr magnetons (μB). In these multilayered structures, FeNi nanoisland giant magnetic moments are interacting due to the indirect exchange forces acting via the Ta electron subsystem. We discovered that the localisation phenomena in the disordered Ta layer lead to a decrease in the Drude contribution of free charge carriers and the appearance of the low-energy electronic excitations in the 1–2 eV spectral range characteristic of electronic correlations, which may accompany the formation of electronic inhomogeneities. From the consistent results of the dc transport and optical studies we found that with an increase in the FeNi layer thickness across the percolation threshold evolution from the superferromagnetic to ferromagnetic behaviour within the FeNi layer leads to the delocalisation of Ta electrons from the associated localised electronic states. On the contrary, we discovered that when the FeNi layer is discontinuous and represented by randomly distributed superparamagnetic FeNi nanoislands, the Ta layer normalized dc conductivity falls down below the MIR limit by about 60%. The discovered effect leading to the dc conductivity fall below the MIR limit can be associated with non-ergodicity and purely quantum (many-body) localisation phenomena, which need to be challenged further
Ni3S2 nanostrips@FeNi-NiFe2O4 nanoparticles embedded in N-doped carbon microsphere: An improved electrocatalyst for oxygen evolution reaction
Full text linkThis is the author accepted manuscript. The final version is available from Elsevier via the DOI in this recordThe designing and preparing of low-cost and easily available electrocatalyst for oxygen evolution reaction (OER) are crucial for many advanced energy technologies. Herein, the Ni3S2 nanostrips@FeNi-NiFe2O4 nanoparticles embedded in N-doped carbon (Ni3S2@FeNi-NiFe2O4/C) microspheres were synthesized as improved electrocatalyst for OER, using a facile heat-treatment method. The optimized Ni3S2@FeNi-NiFe2O4/C-3 sample exhibits enhanced electrocatalytic activity toward OER performance with an overpotential of 280 mV at 10 mA cm−2 and a small Tafel slope of 33.9 mV dec−1. Furthermore, Ni3S2@FeNi-NiFe2O4/C-3 composite shows good stability in alkaline media. The outstanding electrocatalytic OER performance of composites was attributed due to the synergetic effect between Ni3S2 nanostrips and FeNi-NiFe2O4 nanoparticles and it is believed that the heterointerfaces between them act as active centers for OER. Additionally, N-doped carbon prevents the aggregation of Ni3S2@FeNi-NiFe2O4 species and enhances the conductivity of composites during the OER process.Jiangsu University of Science and Technology, Chin
Remaking place: the social construction of a Geographical Indication for Feni
No full textA range of social movements mobilise around and seek to valorise ‘place-based’ imageries. There is, these movements argue, vitality in place. As anthropologists remind us, people continue to construct some form of boundaries around place, however permeable and transient those boundaries might be. In the context of global agrifood, a diversity of socially generated marks indicating conditions of origin have emerged that seek to speak to a range of moral economies. Within this constellation, Geographical Indication (GI) appears as a remarkable place-based intellectual property which the author appreciates as the juridical reification of a place-based stabilisation of cultural norms. However, rather than idealise GIs, the paper also probes a ‘politics in place’ through a fieldwork-based study of a recently acquired GI for Feni, a liquor distilled from either coconut or cashew apples. Juxtaposing observations of Feni distilling with the specifications that constitute the GI, the paper explains these differences in terms of the local social relations of power. The Goa government aligned itself with the recently established Feni Association, composed mainly of large distillers with bottling operations, to acquire the GI and was successful because of the complicity of the GI Registry office.
Remaking place : the social construction of a geographical indication for Feni
Full text linkA range of social movements mobilise around and seek to valorise ‘place-based’ imageries. There is, these movements argue, vitality in place. As anthropologists remind us, people continue to construct some form of boundaries around place, however permeable and transient those boundaries might be. In the context of global agrifood, a diversity of socially generated marks indicating conditions of origin have emerged that seek to speak to a range of moral economies. Within this constellation, Geographical Indication (GI) appears as a remarkable place-based intellectual property which the author appreciates as the juridical reification of a place-based stabilisation of cultural norms. However, rather than idealise GIs, the paper also probes a ‘politics in place’ through a fieldwork-based study of a recently acquired GI for Feni, a liquor distilled from either coconut or cashew apples. Juxtaposing observations of Feni distilling with the specifications that constitute the GI, the paper explains these differences in terms of the local social relations of power. The Goa government aligned itself with the recently established Feni Association, composed mainly of large distillers with bottling operations, to acquire the GI and was successful because of the complicity of the GI Registry office
Nanostructured carbons containing FeNi/NiFe2O4 supported over N-doped carbon nanofibers for oxygen reduction and evolution reactions
No full textFunding from Higher Education Commission (HEC) of Pakistan under NRPU program (grant number 4430 and 5911) is greatly acknowledged to carry out this research. Funding for Ms Iram Aziz, lead author, was provided by British Council to carry out part of this work in University of St. Andrews, UK, and by HEC under Indigenous PhD Fellowship Program.Non-precious metal-based electrocatalysts on carbon materials with high durability and low cost have been developed to ameliorate the oxygen-reduction reaction (ORR) and oxygen-evolution reaction (OER) for electrochemical energy applications such as in fuel cells and water electrolysis. Herein, two different morphologies of FeNi/NiFe2O4 supported over hierarchical N-doped carbons were achieved via carbonization of the polymer nanofibers by controlling the ratio of metal salts to melamine: a mixture of carbon nanotubes (CNTs) and graphene nanotubes (GNTs) supported over carbon nanofibers (CNFs) with spherical FeNi encapsulated at the tips (G/CNT@NCNF, 1 : 3), and graphene sheets wrapped CNFs with embedded needle-like FeNi (GS@NCNF, 2 : 3). G/CNT@NCNF shows excellent ORR activity (on-set potential: 0.948 V vs. RHE) and methanol tolerance, whilst GS@NCNF exhibited significantly lower over-potential of only 230 mV at 10 mA cm-2 for OER. Such high activities are due to the synergistic effects of bimetallic NPs encapsulated at CNT tips and N-doped carbons with unique hierarchical structures and the desired defects.Peer reviewe
The formation conditions of carbon nanotubes array based on FeNi alloy island films
No full textThe array of aligned, isolated carbon nanotubes was achieved by using chemical vapor deposition catalyzed by round alloy particles on the Ag film. The round alloy particles were prepared by annealing FeNi islands on the Ag film deposited by magnetic sputtering on the silica substrate. The size of the round particles was controlled by the size of the FeNi islands films and the heat treated temperature. The array of carbon nanotubes on the Ag film was obtained at 700 degrees C when the round alloy particles was about 30-80 nm in diameter. (C) 1999 Elsevier Science S.A. All rights reserved.Materials Science, MultidisciplinaryMaterials Science, Coatings & FilmsPhysics, AppliedPhysics, Condensed MatterSCI(E)19ARTICLE1-26-933
