Techno-economic study on reagents consumption during uranium leaching, a case study: Gattar pilot plant, Egypt

2021 ◽  
Author(s):  
Mohamed S Nagar
Keyword(s):  
Decision Making ◽  
Acid Concentration ◽  
Pilot Plant ◽  
Project Development ◽  
Economic Study ◽  
Column Leaching ◽  
Uranium Leaching ◽  
Economical Parameter

Abstract The techno-economical parameter must be considered during the decision-making stage of project development. In Gattar, results of column leaching indicate that 21.2 and 32g of acid are consumed using an acid concentration of 20 and 40g/l respectively to have a 1% increase in the uranium leachability. Also, 1.0 and 1.8 l solutions using 0.1:1 and 0.2:1 sprinkling intensities are consumed respectively to have a 1% increase in the uranium leachability during the column leaching period. The vat leaching indicates that the 4.1m3 solution and 88kg acid are consumed to have a 1% increase in the uranium leachability after 90 days.

Blockchain in Supply Chain: Case Study of Lottemart Ciputat

2019 ◽  
Vol 5 (1) ◽  
pp. 38-49 ◽  
Author(s):  
B. K. Handoyo ◽  
M. R. Mashudi ◽  
H. P. Ipung
Keyword(s):  
Decision Making ◽  
Supply Chain ◽  
Supply Chain Management ◽  
Information Asymmetry ◽  
New Technology ◽  
Business Case ◽  
Analysis Method ◽  
Chain Management ◽  
Production Processes

Current supply chain methods are having difficulties in resolving problems arising from the lack of trust in supply chains. The root reason lies in two challenges brought to the traditional mechanism: self-interests of supply chain members and information asymmetry in production processes. Blockchain is a promising technology to address these problems. The key objective of this paper is to present qualitative analysis for blockchain in supply chain as the decision-making framework to implement this new technology. The analysis method used Val IT business case framework, validated by the expert judgements. The further study needs to be elaborated by either the existing organization that use blockchain or assessment by the organization that will use blockchain to improve their supply chain management.

Creating autonomous learners in the teaching of English as a second language (ESL) in Zimbabwean secondary schools : a reality or a myth?

2020 ◽  
Vol 1 (3) ◽  
pp. 103-132
Author(s):  
Rungamirai Matiure ◽  
Erick Nyoni
Keyword(s):  
Decision Making ◽  
Second Language ◽  
Multiple Case Study ◽  
Document Analysis ◽  
Learner Autonomy ◽  
Case Study Design ◽  
Midlands Province ◽  
Multiple Case ◽  
Comprehensive Framework

This study explored the utility of the learner autonomy concept in the Zimbabwean O Level English as a Second Language (ESL) classroom focusing on three Gweru urban high schools of the Midlands Province. The researchers intended to establish whether learner autonomy was a reality or just a myth in Zimbabwean classrooms. A qualitative multiple case study design was applied focusing on teaching strategies, availability of resources, challenges faced and ways of optimising it. Questionnaires and document analysis were used for data collection. The findings revealed that the concept did not manifest in explicit terms, the learners did not participate in decision making, and the teachers were not adequately prepared to administer autonomous processes with students. For it to be a reality, the Education Ministry is recommended to establish a comprehensive framework of how autonomous learning should be implemented. Teacher training should explicitly focus on how to develop autonomous learners. Teachers ought to be flexible enough to accommodate learners' contributions towards their learning.

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