infected organs mainly liver and lungs and to some extent other organs including spleen, kidneys, heart, brain and bones of the animal carcasses. Prevention of cystic hydatid disease primarily focusing on veterinary investigations for controlling the extent and the intensity of echinococcosis in the definitive host populations, which indirectly may lead to control the prevalence of hydatid disease in the intermediate host animals. Treatment of cystic hydatidosis in livestock is still under investigation but anti-helminthes drugs can be used. Regular treatment, taking high degree of precautions when handling pets or dealing with animal meat must be taken into consideration to minimize the level of infection and egg excretion as well as the vaccination of ruminant intermediate hosts, are all in evaluation.

Digital libraries support the transition of academic

institutions towards digital universities, and introducing ETD digital

repositories is believed to be a step in this process. This paper

describes an ETD Digital Library project at the Libyan Academy of

Graduate Studies. The project aims to build digital library for theses

and dissertations (ETD). This work is a project for the first

institutional ETD digital library in the Libyan country. The

researchers developed a system based on Greenstone open source

system for building ETD digital library. A metadata for theses and

dissertations was developed in this research. The paper addresses

issues related to project design, development and user satisfaction.

Conclusions highlighted some important lessons learned to date.

Learning is an understanding of how the human brain is wired to learning rather than to an approach or a system. It is one of the best and most frequent approaches for the 21^st century learners. Micro learning is more interesting due to its way of teaching and learning the content in a small, very specific burst. Here the learners decide what and when to learn. Content, time, curriculum, form, process, mediality, and learning type are the dimensions of micro learning. Our paper will discuss about micro learning and about the micro-content management system. The study will reflect the views of different users, and will analyze the collected data. Finally, it will be concluded with its pros and cons.

Abstract

Swirl stabilized flows are the most widely deployed technology used to stabilize gas turbine combustion systems. However, there are some coherent structures that appear in these flows close to the nozzle whose occurrence and stability are still poorly understood during transition. The external recirculation zone and the Precessing Vortex Core to/from the Coanda effect are some of them. Thus, in this paper the transition of an Open Jet FlowMedium Swirl flow pattern to/from a Coanda jet flow is studied using various geometries at a fixed Swirl number. Phase Locked Stereo Particle Image Velocimetry and High Speed Photography experiments were conducted to determine fundamental characteristics of the phenomenon. It was observed that the coherent structures in the field experience a complete annihilation during transition, with no dependency between the structures formed in each of the flow states. Moreover, transition occurs at a particular normalized step size whilst some acoustic shifts in the frequencies of the system were noticed, a phenomenon related to the strength of the vortical structures and vortices convection. It is concluded that a transient, precessing, Coanda Vortex Breakdown is formed, changing flow dynamics. The structure progresses to a less coherent Trapped Vortex between the two states. During the phenomenon there are different interactions between structures such as the Central Recirculation Zone, the High Momentum Flow Region and the Precessing Vortex Core that were also documented.

For safety evaluation of the core of reactor at Tajoura Nuclear Research Centre (TNRC), a special case has been investigated when the power supply is cutoff and all primary circuit pumps are stopped and scram is occurred. In this case, the coolant flow through the core decreases from a forced convective flow to zero flow and at last becomes an upward flow due to natural circulation flow induced between the core and the reactor pool in which the core is submerged, hence, a core flow reversal occurs. This study focuses on the calculations of the safety parameters during the core cooling by natural convection via constructing a MATLAB program. The transient thermal hydraulic analysis was carried out for the hottest cell in the core. The simulation is performed when the operating power of the core equals to 10 MW and the operation time before scram equals to 72 hr. The results are obtained at the hottest channel for almost 6hr after scram and showed that the maximum clad surface temperature during cooling by pure natural convection decreases from 94.2°C to 60.9°C. The maximum clad surface temperature does not exceed the maximum allowable value of the clad surface temperature which is 102°C [1]. This study proves the capability of cooling the reactor core at TNRC after loss of off-site power.