Browsing by Author "Solomon Tadesse"

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    Causes and Consequences of the Arab Spring of 2011 The Case of Tunisia
    (Addis Ababa University, 2014-10) Solomon Tadesse; Mohammed Hasen
    The African Arab States entered in to serious of uprisings in December 2010. The revolution broke out in Northern African and Arab state of Tunisia. It is one of the wealthiest states on the continent ranks 36th in the world economic competent. It is a country rich in minerals such as Iron, Phosphate, Zinc, Lead, Oil, Petroleum and Natural gas. Besides, Tunisia is one of the leading producers of Agricultural products, such as olives, wheat, barely, tomatoes, citrus, sugar beets, Dates and Almond and goods-textile, Leather and Steel, among others. It is also known for Food and Beverage products. In addition, it is also the second largest tourist destination in the continent next to Egypt. Like Tunisia, the States of Morocco, Algeria, Libya and Egypt are endowed with national resources. They have sizable deposition of Natural gas and Particularly Libya is among the leading producers of petroleum in the world next to Iraq, Iran and Saudi Arabia even supplied 1/10th of petroleum to the world market in 2008. Though the North African Arab States earned huge foreign currency from Natural Gas, oil and other most of their citizens did not benefit from it. They have been living under serious poverty chiefly owing to the dictatorial orientation of the governments. There is no economic, social, and political freedom. They were characterised by unfired distribution of wealth, high rate of unemployment, un equal access to education, lack of housing, lack of transportation, lack of political participation and lack of involvement in public service. The wealth of the state was in the hands of few leaders and western European companies. The leaders of North African Arabians were protectors of their interests as well as Western capitalists. The suppression of problems for a long period of time led to the explosion of violent protests against Arab states governments since 2010. The first protest was seen in Tunisia ending up in ousting of president Zen al-Abidine Ben Ali. Following Tunisian revolution Egyptians moved against the regime and sent Hosni Mubarak in to jail. The revolution in Libya was concluded in killing Muammar Gaddafi and in Yemen Ali Abdullah Saleh forced to leave from his power. The tide of uprising from Tunisia spread out to the whole Arab world including Saudi Arabia, Jordan and Syria. In Syria the revolution still not concluded. In this study the researcher will not focuses on Arab spring in detail rather to assess the Cause and consequences of Tunisian Arab spring of 2010
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    Investigation of in vivo Analgesic and Anti-inflammatory Activities of 80% Methanol Extract of Grewia feruginea Bark, Identifying its Essential Oil Chemical Composition and In Silico Analysis of the Major Constituent
    (Addis Ababa University, 2024-02-15) Yared Yibeltal; Solomon Tadesse
    Investigation of In vivo Analgesic and Anti-inflammatory Activities of 80% Methanol Extract of Grewia feruginea Bark, Identifying its Essential Oil Chemical Composition and In Silico Analysis of the Major Constituent
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    Mineralogical, Geochemical and Textural Characterization of Akobo Gold Deposit for Ore Beneficiation, South Western Ethiopia
    (Addis Ababa University, 2023-10) Kisa Workineh; Solomon Tadesse
    Gold, a precious metal since ancient times, was one of the first metals used by humans due to its availability in placer deposits. However, efficient gold ore processing faces challenges in achieving optimal gold recovery. Inadequate mineral and geochemical characterizations of the ore contribute to inefficient processing. The objective of the project was to assess the mineralogy and geochemical properties of the Akobo gold deposit in order to identify effective treatment methods for optimal gold recovery. Various methods such as optical microscopy, XRD, ICP-AES/MS and SEM are used to evaluate the mineralogy, geochemistry and texture of the gold deposit. The Akobo gold deposit is hosted in metavolcanics and metasedimentary rock, with common alterations including talc alteration, carbonatization, and silicification. Gold mineralogy identified in the area includes krennerite, montbrayite, buckhornite, austobite, calaverite, nagyagite and gold phosphorus thallium selenide. Gangue minerals associated with gold include magnetite, arsenopyrite, pyrite, chalcopyrite, quartz, actinolite, chlorite, siderite, cubanite, covellite, stibnite, and bertherite. Geochemical analysis showed that gold concentration ranged from 0.001 ppm to 9.76 ppm, silica ranged from 26.2% to 58%, iron oxide concentration ranged from 3.79% to 19.3% and the maximum concentration of titanium oxide is 2.47%. The gold particles in the deposit are encapsulated in gangue minerals and range in size from submicroscopic to microscopic (as it ranges from 20μm to 2mm). Most grain size ranges from 50μm to 100μm (about 41%). The Akobo gold deposit is classified as a refractory ore due to its mineral composition, consisting mainly of telluride along with some sulfide and selenide minerals. The processing of this refractory gold requires pretreatment methods such as roasting, bio-oxidation, and pressure oxidation to minimize losses. Comprehensive metallurgical testing is necessary to select a suitable and efficient gold processing method.