Browsing by Author "Zeleke, Mengistu"

Now showing 1 - 2 of 2
  • No Thumbnail Available
    Item
    The Gravity Field and Tectonic Setting of Tile Gedamssa Caldera and its Adjacent Areas
    (Addis Ababa Universty, 1999-05) Zeleke, Mengistu; Alemll, Abem (PhD)
    In this thesis work analysis of587 gravity data collected in the central patt of the Main Ethiopian Rift (MER), between latitudes 8.00- 8.75N & longitudes 38.75- 39.5E ( consisting of Gedamssa caldera is made). The data sets incorporate 50 gravity obselvations that are recently collected by the author with his principal advisor & the remaining 537 gravity observations obtained from previous stllveys carried out by EIGS & Geophysical Obselvatory of AAU. The analysis include compilation in a standard fonnat of the recent & and the previous gravity data sets, which require homogenisation to IGSN71 Datum of the data set fi'om the previous sUlveys that is found out not available to tIns datum. All available data, about 587 stations, obtained li-Oln the EIGS and partly collected by the author, were reduced to sea level with a Ulnfonn crustal density of2.67 gm/cnl Effects Bouguer masses were calculated applying the simple Bouguer correction. Terrain cOlTection of majority of the datas was not applied in which case its effect was treated as systematic error in computing the over all mean square error of the simple Bonguer anomalies at each station. Theoretical gravity field was computed by means of the intematiollal gravity fomlUla of 1967 (GRS67) and tied to the IGSN71. The accuracy of the Bouguer anomaly at each station is calcnlated to about ± 2.8 mGal. The regional and residual gravity field were calculated from the Bouguer anomaly map by means of a software that uses Hanning filter. The compiled Bouguer anomaly map shows a strong con'elation between the regional pattem and topograplnc feature of the sUlvey area. Owing to Ingher elevations, the adjacent plateaus are marked by negative Bouguer anomalies, the minimum of magnitude -245 mGals being located around Areb gebya. The maximum gravity values occur in the NE cOlTesponding to the relatively lower elevations. The main Ethiopian rift including Afar is characterised by a relatively positive anomaly as compared to the plateaus. The high on the rill accounts for the excess Illass at depth on which the emst lies relative to the plateaus where a mass deficiency is assumed. Gravity values on the main Ethiopian rift are generally less as compared to the north pmt of the Ethiopian rift. TIns accounts for the thinning of clusl material towards the Afar along the rift, or it can equally be explained as by a thickelnng of a denser material beneath the cl1lst(probably the anomalous mantle). The margins separating the rift 11'0111 the plateaus are marked by steep gravity gradients which their magnihlde represent the slope of the escarpment. Steep gradients indicllte the transition of gravity field fi'om the platellus to the rift floor.
  • No Thumbnail Available
    Item
    The Practice and Problem of Human Resource Development and Training At vision Ethiopia Congress for Democracy Training Institution
    (Addis Ababa University, 2014-05) Zeleke, Mengistu; Yimam, Melaku (Ato)
    The purpose of this study was to assess the practice and problem of human resource training and development at VECOD training and development institution. For this purpose a sample of 140 trainees and 20 trainee respondents were drawn through stratified sampling method with the combination of simple random sampling technique. Self administrative questionnaires, Interview and document analysis were used to gather data. Data obtained through questionnaire has been analyzed with descriptive statics (mean and frequency) and inferential statics (t-test and chi- square).Moreover; the data obtained using interviews and from document have been analyzed identifying patterns and themes drawn from participants’ own responses. The study revealed that the training institution has simple and clear training content with well trained trainer. The calculated result obtained using inferential statics showed that there were no significant statistical difference between the opinion of trainer and trainee respondents on different issues raised under the practices of training and development at VECOD. Findings indicated that the majority of the respondents were acknowledging the practice of training and development practices conducted by VECOD. Delivering training and development program without tuition fee and having qualified trainers without service fee were special good achievement of the institution. However, there were challenges and limitations. Inadequate budget, inadequate training space, insufficient module distribution, lack of appropriate training need assessment and lack of clear training written policy were some of the major problems of the training programs. The study concluded that the institution has encouraging training and development practice with some limitations. Therefore, it has been recommended that the training and development program shall be planned and designed systematically in order to address these constraints. It is also important the courses shall be delivered based on the trainees’ educational level. Thus, it has been recommended that the training and development need assessment needs to be properly conducted and training policy, guide line, manuals, producers and structures shall be developed in order to conduct effective training and development program. Training rooms should be given due attention since it has a great impact for the effectiveness and efficiency of the training and development program. Generally, the study suggested that training and development programs have to be strategic and systematic in order to achieve the desired objectives