A comparative analysis of life style of the local people before and after the construction of the dams in the sub zone of Mendfera : a case study of Adi-Mengoti and Mai-Aron damsMohammad Afsar Alam
, Masihulla Khan
, 2014, izvirni znanstveni članek
Opis: Eritrea is one of the Sahelian countries in the Horn of Africa facing acute shortage of water. In areas where rainfall is low and unreliable, the construction of dams is utmost important for irrigation, domestic and livestock uses. Agriculture is the mainstay of Eritrean people; it has been playing a vital role in the process of economic development. It is estimated that about 75 per cent of the population depends on agriculture and allied activities. In such a country where agriculture is the backbone of the economy regular supply of water for irrigation is as important as the veins and arteries in the human body. In fact, dams serve multi purposes i.e. water supply for agriculture and domestic uses, flood control, hydro-power generation, navigation, fisheries and recreation activities. But in Eritrea, dams are mainly constructed to supply water for irrigation, domestic, industrial and livestock uses. This research paper is carried out to examine a comparative analysis of life style of the local people before and after the construction of the dams in the sub zone of Mendefera (Zoba Debub, Eritrea).
Ključne besede: Africa, Eritrea, dams, water supply, agriculture, regional development, economic development
Objavljeno v DKUM: 16.04.2018; Ogledov: 733; Prenosov: 69
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Influence of magnetic field on the aragonite precipitationLucija Črepinšek-Lipuš
, Danijela Urbancl
, 2007, izvirni znanstveni članek
Opis: Many laboratory investigations of magnetic water treatment (MWT) for scale control explained the formation of less compact scales by raised portion of aragonite, which is needle-like and less adhesive than rhombohedral calcite crystals, while our experiment was conducted with tap water, which contains Mg+2 and Fe+2 ions in concentrations exceeding thresholds for calcite inhibition, common for major tap waters. MWT efficiency was evaluated by amounts of scale precipitated in boilers and pipes during three-weeks run of two parallel experimental lines-one with and another without magnetic treatment. All scales were identified by X-ray diffractometer to be aragonite,but in the case of magnetic treatment, scales occurred in much smaller amounts: the scale on heating copper-pipe spiral was 2.5-times thinnerdue to MWT and in zinc-coated steel pipe occurred as very thin powder-like coating, while in the line without the treatment abundant hard lining was formed. The scalesć morphology was observed by scanning electron microscope: the husks from both lines consisted of parallel distributed needles, but these crystals were about four times thinner in the case of MWT. The present work demonstrates that hard scale deposits can form even under conditions where aragonite precipitates predominantly, and that MWT can also affect the crystallization of this polymorph in a manner conducive to scaling control.
Ključne besede: water, magnetic water treatment, scale, aragonite, cristallization, water supply pipes
Objavljeno v DKUM: 01.06.2012; Ogledov: 1795; Prenosov: 97
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FP7 EU project AquaFit4Use - synergy of 4 industrial sectors with the goal of waste water recyclingAlenka Majcen Le Marechal
, Simona Vajnhandl
, Darko Golob
, 2009, strokovni članek
Opis: Sustainable water use in industry is the goal of AquaFit4Use, by a cross-sectorial, integrated approach. The overall objectives are: the development and implementation of new, reliable, cost-effective technologies, tools and methods for sustainable water supply, use and discharge in the main water consuming industries in order to significantly reduce water use, mitigate environmental impact and produce and apply water qualities in accordance with industrial own specifications (fit - for - use) from all possible sources, and contributing to a far-going closure of the water cycle in a economical, sustainable and safe way while improving their product quality and process stability.
Ključne besede: waste water recycling, reduce water use, water quality, sustainable water supply
Objavljeno v DKUM: 31.05.2012; Ogledov: 2204; Prenosov: 29
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