Designing an Electronic Course and Its Impact on Developing University Students' Computational Thinking Skills

Al-Zahrani, Majed bin Maili bin Mohammad International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.1

The study investigated the effects of differences in some electronic course designs on university students' Computational Thinking Skills (CTS). Towards this end, the researcher adopted the experimental research design of a quasi-experimental of two experimental groups. The first group was taught an e-course designed in a sequential pattern, and the other group's course was designed according to the holistic model. A CTSs test was prepared to collect the relevant data, and the data were analyzed statistically using these tests- Pearson correlation Mann Whitney and Alpha Cronbach. Results revealed statistically-significant differences at the level α=0.05 between the mean scores of the first and second experimental groups in favor of the latter in the CTS test. The findings gave ground to put forward some salient recommendations, including the need to expand computational thinking in universities' educational process. It also recommends urging faculty members to enhance e-courses in the educational process and provide technical support to students and faculty members.

The Reality of Transitional Services Provided to People with Intellectual Disabilities from the Point of View of Parents

AL Zahrani, Mohammed Abdullah,Alqudah, Derar Mohammed International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.11

The current study aimed to identify the reality of the transitional services provided to people with intellectual disabilities from the parent's point of view. The results indicated an average level, with an arithmetic mean (3.66) of the reality of transitional services provided to students with intellectual disabilities through the response of the study participants to the questionnaire consisting of (20) items. The dimension (social and societal skills) ranked first with an arithmetic average (4.03) with a high degree, through the response of the participants in the study to the items of the dimension consisting of (10) items. It was followed by the dimension (self-determination skills) with an arithmetic average of (3.29) to a medium degree, through the response of the participants in the study to the items of the dimension consisting of (10) items. The researchers recommend the necessity of joint planning by all relevant authorities, to solve the legal, societal, technical, and administrative problems and challenges that impede the provision of transitional services for students with intellectual disabilities.

Effects of Differences in Electronic Course Design on University Students' Programming Skills

Al-Zahrani, Majed bin Maili bin Mohammad International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.1

This study touched on the effect of the different electronic course designs on the programming skills of university students. The researcher used the experimental research design of a quasi-experimental of two experimental groups to achieve the objectives of the study. The first group underwent an electronic course designed in the holistic pattern, and the second group was taught a course in a sequential pattern. This experimental design was intended to measure the impact of these two learning modes on the learners' cognitive and performance achievement of programming skills. An achievement test and observational form were the data collection tools. Data were analyzed statistically using Pearson correlation, Mann Whitney Test, and Alpha Cronbach. The findings revealed statistically- significant differences between the mean scores of the students of the first and second experimental groups in favor of the former concerning the observational form and the latter in the cognitive test. Based on the findings, some recommendations are suggested. Due to their effectiveness in the educational process, expanding using the e-courses at universities is vital. The university teachers are highly recommended to design e-courses and provide technical and material support to the e-courses user to fulfill their design purpose.

Performance Analysis of the Impact of the Propagation Environments on the WiMAX Service Classes

Yahya Abdullah Yahya Al zahrani 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.1

Five different service classes are supported in mobile WiMAX IEEE 802.16 standard in order different needs of the mobile users to be fulfilled. In this paper we analyze the impact of the propagation environments on the WiMAX service classes and we measure the QoS performances of the service classes that are utilized from the mobile users. Simulation experiments are done utilizing the ns-2.33 simulator where all five service classes of the WiMAX are properly configured. Performances analysis of the service classes in mobile WiMAx is done measuring the average throughput, average delay and average jitter in various propagation environments. Obtained results give important conclusions about the QoS of the five service classes in mobile WiMAX in various propagation environments.

Used lubricating oil regeneration by various solvent extraction techniques

SAEED M. AL ZAHRANI,Meilana Dharma Putra 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2

The used lubricating oil regeneration using extraction technique has been widely known as one of the cheapest and most competent processes. The best performance of solvent was shown by R-11 as the lowest percent oil losses, followed by CFC-113, MEK, 1-butanol, and 2-propanol. This performance sequence could be also evaluated by method of solubility parameter difference (Es) using Hildebrand and Peng–Robinson EoS approaches. The effectiveness of extraction parameters was also studied. The percent oil losses decreased with the extraction temperature. The values of optimum ratio of solvent to oil obtained by the Es method gave reasonable results compared to the experimental method.

Synthesis, Dynamics of Solvatochromism and pH-sensory of Novel Push-π-pull Phenothiazine-quinoline Fluorophore Toward Turn-on Fluorescent and Colorimetric Test Strips

Fatimah A. M. Al-Zahrani 한국섬유공학회 2022 Fibers and polymers Vol.23 No.5

Novel donor-central-π-bridge-acceptor (E)-1-ethyl-2-((10-hexyl-10H-phenothiazin-3-yl)methylene)-2,4a-dihydroquinolin-1-ium (PTZ-Q) fluorophore with remarkable solvatochromism, high fluorescence and pH-sensory properties was designedand synthesized in good yield. PTZ-Q sensor was fully characterized utilizing various spectroscopic techniques, includinginfrared (FTIR), 1H/13C nuclear magnetic resonance, and mass spectroscopic methods. UV-Vis absorption spectra of theprepared donor-acceptor PTZ-Q were explored in different solvents of varying polarities to show positive solvatochromismrelated to intramolecular charge transfer. Additionally, the fluorescence spectra of PTZ-Q displayed strongly solventdependentwavelength and band intensity. Stokes’ shifts were found to increase upon increasing the polarities of solvents upto 3984 cm-1 for the highest polar solvents. Linear energy-solvation correlation was employed to examine solvent-dependentStokes’ shift. Quantum yields (ф) of PTZ-Q were determined. The pH-dependent absorption and emission spectra indimethylformamide were also explored. The UV-Vis absorption intensity was monitored at 522 nm, while the emissionintensity was detected at 603 nm in DMF. The pH sensing mechanism was found to depend on proton abstraction to the PTZQfluorophore to result in colorimetric and fluorescent spectral changes associated with a colorimetric shift from yellow topink, red and purple. The synthesized PTZ-Q probe was utilized to fabricate colorimetric and fluorescent test strips with theability to detect pH changes in aqueous media, which was verified with CIE Lab color coordinates.

Analysis of activated colloidal crud in advanced and modular reactor under pump coastdown with kinetic corrosion

Mehboob Khurram,Al-Zahrani Yahya A. 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.12

The analysis of rapid flow transients in Reactor Coolant Pumps (RCP) is essential for a reactor safety study. An accurate and precise analysis of the RCP coastdown is necessary for the reactor design. The coastdown of RCP affects the coolant temperature and the colloidal crud in the primary coolant. A realistic and kinetic model has been used to investigate the behavior of activated colloidal crud in the primary coolant and steam generator that solves the pump speed analytically. The analytic solution of the non-dimensional flow rate has been determined by the energy ratio b. The kinetic energy of the coolant fluid and the kinetic energy stored in the rotating parts of a pump are two essential parameters in the form of b. Under normal operation, the pump's speed and moment of inertia are constant. However, in a coastdown situation, kinetic damping in the interval has been implemented. A dynamic model ACCP-SMART has been developed for System Integrated Modular and Advanced Reactor (SMART) to investigate the corrosion due to activated colloidal crud. The Fickian diffusion model has been implemented as the reference corrosion model for the constituent component of the primary loop of the SMART reactor. The activated colloidal crud activity in the primary coolant and steam generator of the SMART reactor has been studied for different equilibrium corrosion rates, linear increase in corrosion rate, and dynamic RCP coastdown situation energy ratio b. The coolant specific activity of SMART reactor equilibrium corrosion (4.0 mg s1 ) has been found 9.63 103 mCi cm3 , 3.53 103 mC cm3 , 2.39 102 mC cm3 , 8.10 103 mC cm3 , 6.77 103 mC cm3 , 4.95 104 mC cm3 , 1.19 103 mC cm3 , and 7.87 104 mC cm3 for 24Na, 54Mn, 56Mn, 59Fe, 58Co, 60Co, 99Mo, and 51Cr which are 14.95%, 5.48%, 37.08%, 12.57%, 10.51%, 0.77%, 18.50%, and 0.12% respectively. For linear and exponential coastdown with a constant corrosion rate, the total coolant and steam generator activity approaches a higher saturation value than the normal values. The coolant and steam generator activity changes considerably with kinetic corrosion rate, equilibrium corrosion, growth of corrosion rate (DC/Dt), and RCP coastdown situations. The effect of the RCP coastdown on the specific activity of the steam generators is smeared by linearly rising corrosion rates, equilibrium corrosion, and rapid coasting down of the RCP. However, the time taken to reach the saturation activity is also influenced by the slope of corrosion rate, coastdown situation, equilibrium corrosion rate, and energy ratio b.

Kinetic model-based feed-forward controlled fed-batch fermentation of Lactobacillus rhamnosus for the production of lactic acid from Arabic date juice

Choi, Minsung,Al-Zahrani, Saeed M.,Lee, Sang Yup Springer-Verlag 2014 Bioprocess and biosystems engineering Vol.37 No.6

,A REVIEW OF THE APPLICATIONS OF NANOCARBON POLYMER COMPOSITES

ATEEQ RAHMAN,ILIAS ALI,SAEED M. AL ZAHRANI,RABEH H. ELEITHY 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2011 NANO Vol.6 No.3

Nanotechnology offers fundamentally new capabilities to architect a broad array of novel materials, composites and structures on a molecular scale. It is potentially capable of redefining the methods used for developing lighter, stronger, high-performance structures and processes with unique and nontraditional properties. This review summarizes different classes of nanocarbon-based polymer composites and their applications. Also, it highlights different ways to create smaller, cheaper, lighter and faster devices using nanocarbon-based polymer composites. The potential applications of such materials are in the fields of membrane, aviation, electronics, polymer composites, as well as the marine and transport industries. A detailed description of nanocarbon-based composite materials manufactured from PE, PP, PS, PS, PVC, PPS, ABS, PMMA, nitrile rubber, etc. is also reviewed. Some of the major applications of carbon-based polymer nanocomposites are in the tyre industry, semiconductors, and many more, which has brought about the new, developing and exciting research field called nanoscience.

An extended Lindley distribution

Hassan S. Bakouch,Bander M. Al-Zahrani,Ali A. Al-Shomrani,Vitor A.A. Marchi,Francisco Louzada 한국통계학회 2012 Journal of the Korean Statistical Society Vol.41 No.1

In this paper we introduce an extension of the Lindley distribution which offers a more flexible model for lifetime data. Several statistical properties of the distribution are explored, such as the density, (reversed) failure rate, (reversed) mean residual lifetime,moments, order statistics, Bonferroni and Lorenz curves. Estimation using the maximum likelihood and inference of a random sample from the distribution are investigated. A real data application illustrates the performance of the distribution.