The main aim of this investigation is to design and implement a novel fluidic injection based jet noise suppressor for high speed flows. Contrary to previous studies which injected fluid either inside the nozzle or just at the nozzle exhaust, this injection scheme injects multiple microjets perpendicular to the jet axis at an axial location downstream from the nozzle exhaust via a coaxial injector tube. Microjet injection closer to the jet axis leads to the formation of counter rotating vortex pair (CVP) close to the injection location which further beaks down into stream-wise vortices as the microjet bends and follows core flow direction. Isothermal jet-injector configuration is tested for a Mach 0.9 single stream nozzle with continuous injection. Instantaneous aerodynamic fields are obtained using Large Eddy Simulation (LES) and the results are validated with previous experimental data. The results suggests that the presence of coaxial injector tube significantly alters the flow field leading to shorter jet core and a reduction in the far field noise. When the fluid injection is activated there is a decrease in the far field mixing noise due to the decrease in the turbulence in the jet resulting from enhanced mixing. The study involves analyzing the effect of multiple design and operating parameters on the mixing characteristics and far field noise.
Preform compaction and resin impregnation are two major steps in composite manufacturing by liquid composite molding processes. Understanding of the preform compaction and permeability characteristics is important for the process characterization and optimization. Existing methods either require a number of tedious experiments, at the cost of material and labor, or numerical simulations using geometric models of the reinforcement preform. Geometric modeling approaches of the preforms fail to capture the real architecture as well as the effect of the compaction of the reinforcements. This study presents numerical computation of through thickness permeability of two types of 3D woven fabrics by in-situ compaction characterization using micro X- ray computed tomography (?XCT). The study focuses on obtaining fiber deformations during compaction and converting them into computational mesh for flow analysis using ANSYS FLUENT. The real-time 3D images were obtained by in-situ compaction at four different fiber volume fractions. The ?XCT analysis revealed significant microstructure changes at high compaction levels. The flow field analysis revealed three dimensional flow paths within the preform. The computed through thickness permeability values agree well with the experimental data.
To improve students' achievement, the ADEK (Abu Dhabi Authority for Education and Knowledge) focuses more on improving policies, teaching practices, as well as curricula and focuses less on adolescents' developmental needs. Unfortunately, students in Al Ain schools are far from being ranked the best in the international exams. This could be explained in that the change did not consider changing different school climate practices that could satisfy the students' developmental need of belonging. This need is so crucial as it helps in increasing students' motivation to work harder and then to achieve more. Therefore, the main purpose of the study is to explore school climate factors and their influences on adolescents' sense of school belonging in Al Ain schools. A useful framework for exploring the school climate factors is Bronfenbrenner's ecological system theory (1979, 1993). This study will follow a sequential exploratory research design.
This paper is part of a multiphase study aims to develop a program of Families, Schools and Community Educational Partnerships (FSCEPs). In this phase, the study questions are: 1) How are existing FSCEPs defined and implemented in the UAE context? 2) What are the barriers and opportunities that influence FSCEPs program implementation? 3) What suggestions do relevant stakeholders have to initiate, improve and sustain FSCEPs partnerships in the context of the UAE? The data was collected by using semi-structured interviews. The sampling technique that was used in this phase is the snowball sampling. The targeted population is the staff of ADEK and KHDA. The study results delineated the detailed description of the current FSCEPs in the UAE from the perspective of two main educational entities.
This study goes over the inspection of the Emirate of Abu Dhabi analyzing teachers' situation during and after the period of inspection. It investigates in particular the understanding of the teachers for the purpose of inspection, which is leading them to perform, communicate, receive feedback and urge them to raise the bar of their students' expectations in order to meet the high standards of the Inspection-Irtiqa'a program.
United Arab Emirates is a multicultural country. Meeting the students need is crucial to improve the students' achievement. One important factor is addressing their cultural interests through teaching. In this research, grade five students will be taught a thematic unit depending on cultural responsive teaching. Achievement of the experimental group will be compared with the control group to examine the effectiveness of the cultural responsive teaching. More empirical research is needed. In addition, more training is required for teachers to be able to use the CRT in classrooms.
Along with the intensely discussed physical dimensions of a city, social dimensions also contribute towards the sustainability of its future. This research studies the public open spaces, which is a vital factor that adds to both the physical and social aspects of the city. The study mainly focuses on the importance that open spaces have in the daily lives of residents and how it contributes to the identity of the main island. The requirement is stressed upon considering the fact that a majority of the population is working, which has an indirect influence on the non-working population as well. The diverse nature of the city has led to the emergence of countless informal spaces, scattered across the island. As part of the research, a mapping of unbuilt urban spaces having special uses has been done, to provide a snapshot of Abu Dhabi residents' spatial practices within or outside of the existing formal recreational spaces.
The purpose of the research is to examine the barriers of communication and their effect on the quality of interpretation in the ADJD. The researcher adopted the quantitative research methodology. A survey of 15 questions was organized. The survey included the personal and the physical barriers of communication as dependant variables and the quality interpretation as an independent variable. The results showed that interpretation in the ADJD is conducted fairly, clearly and professionally, following the best standardizations.
In this paper we propose the importance and effects of social media in the United Arab Emirates emergency management. Social media platforms like Facebook and twitter can be of great use in the situation of emergency. A number of examples have been quoted in the paper for the clarification of the topic. However, the emergency situation and their cure with social media have also been mentioned.
The advancement of technology and globalization has developed a framework of unprecedented level of competitiveness between cities and nations worldwide. The ever changing market trends has made places very competitive in the strive to access and attract local, regional and international investments, talent and tourists. In this regard the notion of "place brand" has risen to become an important factor for cities and nations to get a competitive edge on their competitors. That said brand communication strategies deployed by governments can take different forms and measuring their impact and usefulness in enhancing the place image and ultimately ability to attract tourists, talents and foreign direct investment is a task not undertaken by many scholars. Thus this study intends to construct a measuring tool to identify place images and measure the impact of brand communication strategies deployed by governments on place brand image and ultimately its relation to attracting FDI. The study is of importance because generally quantitative studies in the domain of place branding are very limited and there has not been many rigorous attempts to develop measuring tools to assess place brand image, nor connecting that to brand communication strategies. Additionally, research conducted on place branding communications constitute as an area of that has not been thoroughly investigated in the MENA region.
