Effat University Institutional Repository

Effat University Institutional Repository

Welcome to the Effat University Repository, a service of Effat Library and Cultural Museum. This repository provides global and open access to scholarship and research output created by Effat University faculty, graduate and undergraduate students.
While the University Repository is accessible to the public, submission is limited to the Effat University community.
To submit your research, click here.

If you have any questions, please email us at repository@effatuniversity.edu.sa

  • How Essential is Flexibility in the Workplace for Employee Motivation at Private Universities in Jeddah? A Comparison Prior to And During Covid-19

    Javed, Uzma; Kayyal, Noor; Human Resource Management
    Motivation is the driving force behind human actions. It comprises the factors that contribute to behavioral patterns, such as emotional, social, and cognitive variables. Employee motivation may have significantly changed due to the unfortunate events at the conclusion of the 2019 calendar year. However, due to the current wave of changes, numerous employees now prefer a hybrid work environment that, thanks to its flexibility, has acted as a source of motivation for some employees in private educational institutions. The objectives in this research were to discover the many facets of workplace flexibility. Second, to identify the many components of workplace motivation, and to finally investigate the relationship between the two. This research used an online survey method to collect data to evaluate the extent to which flexibility is perceived essential for motivation of employees working in private universities in Jeddah, and if there is a significant difference prior to and during COVID-19. After receiving 40 respondents and inputting the survey results into SPSS to analyse and interpret the data, the main finding was that employees are more likely to be motivated when they have flexibility in their workplace with particular inputs, such as the confidence of their manager or a supportive colleague. The outcomes indicated that individuals do not need to simply pursue higher positions in their employment since they value flexibility in their lives, as well as various aspects such as gaining their manager's confidence and obtaining incentives.
  • Reflecting on oikos and agora in smart cities context: Concluding remarks

    Anna Visvizi; Lytras, Miltiadis; University Collaboration; NA; NA; NA; Computer Science; NA; Anna Visvizi (Elsevier, 2019-01-01)
    Smart cities, seen as a concept and policy strategy, have firmly established themselves as the key tenet of contemporary academic and political debates. The thrust of these debates is formed by the tacit recognition tha—if used in socially and ethically sensitive ways—information and communication technology (ICT)–enhanced tools and approaches may allow addressing challenges cities face very effectively. From a different angle, with the onset of sophisticated ICT, the social reality seems to have become more complex than ever, and the city space attests to it. As the traditional binary division between oikos (οίκος) and agora (αγορά) in city space has been challenged by the emergence of parallel channels of communication and consolidation of “virtual” public and private space, several foundational questions emerge. This chapter highlights them.
  • Mathematical Modeling and Simulation of Metal Hydride Hydrogen Storage

    El-Amin, Mohamed F.; No Collaboration; Energy Lab; 0; 0; NSMTU; 0; El-Amin, Mohamed F. (Springer, 2023-06-01)
    Abstract. Energy storage is considered one of the most challenging with the rising energy demands. High energy density requires more extended storage than traditional storage. Recently, hydrogen has been considered one of the solutions for the future energy transition in terms of several aspects, such as hydrogen generation, safety, and storage. Metal hydride hydrogen storage has gained much interest as a possible medium for ample storage. This study introduces mathematical modeling and numerical simulation of metal hydride hydrogen storage. The metal hydride is a porous medium that absorbs or releases hydrogen under different heat transfer conditions. The mathematical model should clearly describe the complicated physics in the metal hydride hydrogen storage, such as absorbent, transport in porous media, and extracting the hydrogen from the absorbent material. Therefore, heat and mass transfer to and from the metal hydride is critical in the storage process. Moreover, since the pressure inside the bed is moderate, hydrogen is considered an ideal gas. It is assumed that the solid phase is isotropic and uniformly porous. The Van't Hoff equation expresses the gas pressure equilibrium. The hydrogen invades the alloy bed, and metal grains absorb it, which leads to density variation. This change in hydride density produces both absorption reaction and diffusive movement due to the hydride concentration, where the porosity and diffusion movement coefficient will be constant. Based on that, governing partial differential equations are provided in polar coordinates along with algebraic empirical relationships and initial/boundary conditions. Then, the developed mathematical system was solved numerically using the mixed finite element. The results have been presented and discussed by considering possible heating/cooling scenarios. It was found that hydrogen reaction with the porous hybrid metal, including density variation, depends mainly on the heating and cooling efficiency.
  • Experimental Investigations and Modeling of Atmospheric Water Generation Using a Desiccant Material

    Almasarani, Ahmad; Ahmad, Imtiaz K.; El-Amin, Mohamed F.; Brahimi, Tayeb; Department Collaboration; Energy Lab; 0; Ahmad Almasarani; NSMTU; 0; et al. (MDPI, 2022-09-19)
    Harvesting atmospheric water by solar regenerated desiccants is a promising water source that is energy-efficient, environmentally clean, and viable. However, the generated amounts of water are still insignificant. Therefore, more intensive fundamental research must be undertaken involving experiments and modeling. This paper describes several experiments, which were conducted to predict and improve the behavior of water absorption/desorption by the Calcium Chloride (CaCl2) desiccant, where the uncertainty did not exceed ±3.5%. The absorption effect in a deep container was studied experimentally and then amplified by pumping air into the solution. The latter measured water absorption/desorption by a thin solution layer under variable ambient conditions. Pumping air inside deep liquid desiccant containers increased the water absorption rate to 3.75% per hour, yet when using a thin layer of the solution, it was found to have increased to 6.5% per hour under the same conditions. The maximum amount of absorbed water and water vapor partial pressure relation was investigated, and the mean absolute error between the proposed formula and measured water content was 6.9%. An empirical formula, a one-dimensional mathematical model, was then developed by coupling three differential equations and compared to experimental data. The mean absolute error of the model was found to be 3.13% and 7.32% for absorption and desorption, respectively. Governing mathematical conservation equations were subsequently formulated. The mathematical and empirical models were combined and solved numerically. Findings obtained from the simulation were compared to experimental data. Additionally, several scenarios were modeled and tested for Jeddah, Saudi Arabia, under various conditions.
  • Policy implications for smart healthcare: the international collaboration dimension

    Lytras, Miltiadis; Sarirete, Akila; Vassilios Stasinopoulos; External Collaboration; NA; NA; NA; Computer Science; NA; Miltiadis D Lytras (Academic Press, 2020-01-01)
    The recent evolution of information and communication technology leads to a significant shift in the agenda and promise of medical informatics. Smart healthcare is promoted as a unified paradigm of novel insights for personalized medicine worldwide. In this era of early adoption, investments in medical informatics, especially in the context of research and development projects as well as in commercialized technologies, envision the ultimate objective: to facilitate a sociotechnological ecosystem of data, services, applications, and applied medical systems for the promotion of health and wellbeing. The purpose of this concluding chapter is to set up a context for further dialog related to the integration of innovation in medical systems and advanced policy making.

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