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Squeeze flow and rheological characterization of pure bitumen and bitumen mixed with kaolin
Amal Kraiem,Abdelhak Ayadi,Nadia Elkissi 한국유변학회 2022 Korea-Australia rheology journal Vol.34 No.3
This study dealt with an experimental squeeze-fl ow test between two parallel disks and rheological measurements using a rotational rheometer of pure bitumen and bitumen mixed with 10 and 20 wt.% kaolin without slip condition. The experimental procedure of the homogeneous samples’ preparation was described. A steady-state and dynamic rheological analysis for pure bitumen and bitumen mixed with kaolin was detailed. Results show that pure bitumen and bitumen mixed with 10 wt.% kaolin at 26 °C correspond to a shear-thinning behavior. The effect of the kaolin particles becomes more critical at low shear rates than at high shear rates, where the matrix effect was dominant. The influence of temperature on bitumen mixed with 20 wt.% kaolin was investigated, and the obtained results show that the samples behave like a power-law model at 50 °C. Besides, the squeeze-fl ow test impact at an ambient temperature of 26 °C for pure bitumen and bitumen mixed with kaolin was also studied. Adding kaolin leads to a significant increase in viscosity and confirms the studied cases in the rheometry test at 26 °C. It was proven that pure bitumen and bitumen mixed with kaolin follow a power-law model at a specific range of shear rate. In particular, the decrease of the shear rate in bitumen mixed with 20 wt.% kaolin triggers the detection of the yield stress, which did not appear in the rheological measurements due to the applied deformation either in the shear and/or the elongational flow.
Towards a Comprehensive View of Web Services QoS Models
Jokha Al-Kalbani,Naoufel Kraiem,Zuhoor Al-Khanjari,Yassine Jamoussi 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.10
In a growing web services environment, the usage, design and composition methods of web services require proper and reliable information about web services quality. Quality- of- Service (QoS) is usually referred to the non-functional characteristics of web services which can be used as an important role to differentiate between different web services. In order to select the best web services among those with similar functionality, it is important for the web requester to have a mechanism to rank them and also from the service providers side to ensure that their web services are according to the agreed QoS. Currently there is no standard manner to define the QoS characteristics of web services. Many studies have shown different categorization of QoS which led to the issue of semantic interoperability of QoS. One way to understand the QoS, is to identify all its possible requirements for web services. This paper is an attempt to explore some of the QoS issues which are essential for web services. It first proposes a QoS framework which suggests considering QoS for web services along four different views. Each view is representing a particular relevant facet of QoS models. The main contribution of this paper is to show that there is a big quantity and variety of interpretations of various service quality concepts and models and gives the reasons why there is no holistic QoS modeling approach.
Developing Educational Mobile Application Architecture using SOA
Z. Al-Khanjari,Z. Al-Kindi,E. Al-Kindi,N. Kraiem 보안공학연구지원센터 2015 International Journal of Multimedia and Ubiquitous Vol.10 No.9
Mobile technologies have enormous potential to transform ordinary institutions content to electronic content. This change contributes to advance the level of performance of these institutions, whether educational or services institutions. Therefore, developing such applications using one of the well-known Software Engineering paradigms is important to support the institutions. Most of educational organizations in Oman don’t provide a clear mobile application architecture that supports different organizational services. The significant purposes of these services are to provide an environment with more malleable procedures, satisfying student’s needs, and achieving a quick access to information. Moreover, this paper proposes an extension tool to support students in all educational fields to send their appeal against exams results via a mobile application that integrates one of the well-known software architectures called Service-Oriented Architecture (SOA). In this paper, Service-Oriented Architecture for post result mobile application is used to integrate a set of services that have been implemented in a web server with the existing post result application.