Observation of Three Variable Stars and an Asteroid Using Small Telescopes in the United Arab Emirates (UAE)

Mohammad Sh. Odeh,Mashhoor Al-Wardat The Korean Space Science Society 2023 Journal of Astronomy and Space Sciences Vol.40 No.1

We present the results of using small telescopes in the United Arab Emirates (UAE) for observing variable stars and asteroids. Two telescopes, namely, 5" apochromatic refractor and 14" Schmidt-Cassegrain, at Al-Khatim Observatory (M44) were used for the observations. The targets were the three variable stars RR GEM, AG LMi, and DL CMi and the asteroid 22 Kalliope. We found a good consistency between our light curves and published ones for the calibration targets, i.e., the asteroid 22 Kalliope and the variable star RR GEM. According to previous studies, AG LMi has two suggested periods, 16.3 hours and 32.62 hours. Our results clearly confirm the second one, with a period of 32.6175 hours. The star DL CMi has several suggested periods as per previous studies, such as 4.0173 days, 1.9606 days, and 2.0086 days. Our observations confirm the first one, with a period of 4.0159 days. These results demonstrate the effectiveness of using small telescopes for observing variable stars and asteroids. This work provides some recommendations on using small telescopes for such observations.

Genetic Markers for Adolescent Idiopathic Scoliosis on Chromosome 19p13.3 among Saudi Arabian Girls

Abdallah Ahmad Al-Othman,Mir Sadat-Ali,Ahmed Sh. Amer,Dakheel A. Al-Dakheel 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.2

Study Design: Prospective case-controlled study. Purpose: This study aimed to assess genetic influence in Saudi Arabian children with adolescent idiopathic scoliosis (AIS). Overview of Literature: The genetic locus linked to chromosome 19p for idiopathic scoliosis has been described. A pilot study conducted at King Fahd Hospital of the University, Al-Khobar showed that three microsatellite markers (D19S216, D19S894, and DS1034) of chromosome 19p13.3 were significant in Saudi Arabian females compared with healthy subjects. Methods: A total of 100 unrelated Saudi Arabian girls treated for AIS, their parents, healthy siblings, and healthy subjects were recruited for genetic analysis of markers on chromosome 19p13.3. After informed consent was obtained from their parents, blood samples were collected and parametric and nonparametric linkage analyses were performed using GENEHUNTER ver. 2.1. Multipoint linkage analysis was used to specify an autosomal dominant trait with a gene frequency of 0.01 and an estimated penetrance of 80% at the genotypic and allelic levels. Results: Five hundred blood samples were collected and analyzed for microsatellite markers (D19S216, D19S894, and DS1034) of chromosome 19p13.3. Comparison among patients, family members, and healthy subjects revealed no significant association between markers and scoliosis at the genotypic level: D19S216 (p =0.21), D19S894 (p =0.37), and DS1034 (p =0.25). However, at the allelic level, a statistically significant association was observed for marker DS1034 (p =0.008), and marker D19S216 showed significance between fathers and patients (p <0.001) compared with patients and mothers. The other two markers, D19S216 (p =0.25) and D19S894 (p =0.17), showed no significant association between patients and mothers. Conclusions: At the allelic level, marker DS1034 was significantly associated with AIS patients and their fathers. This allelic marker on chromosome 19p13.3 appears to be important in AIS etiology.

Implementation of 2D Snake Model-based Segmentation on Corpus Callosum

Ala'a ddin Al Sh,최흥국 한국멀티미디어학회 2014 멀티미디어학회논문지 Vol.17 No.12

The corpus callosum is the largest part of the brain, which is related to many neurological diseases. Snake model or active contour model is widely used in medical image processing field, especially imagesegmentation they look into the nearby edge, localizing them accurately. In this paper, corpus callosumsegmentation using the snake model, is proposed. We tested a snake model on brain MRI. Then wecompared the result with an active shape approach and found that snake model had better segmentationaccuracy also faster than active shape approach.

Acute Effects of Dokha Smoking on the Cardiovascular and Respiratory Systems among UAE Male University Students

Shaikh, Rizwana B.,Haque, Noor Mohammad Abdul,Al Mohsen, Hassan Abdul Hadi Khalil,Al Mohsen, Ali Abdul Hadi Khalil,Humadi, Marwa Haitham Khalaf,Al Mubarak, Zainab Zaki,Mathew, Elsheba,Al Sharbatti, Sh Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.5

Background: In the United Arab Emirates (UAE) tobacco use is rampant. A less reported, yet widely used form of smoking native to UAE is midwakh or dhokha. The aim of the study is to assess the acute effects of smoking dokha (Arabian pipe) on the cardiovascular and respiratory systems among male university students in the UAE. Method: A quasi-experimental study was conducted among 97 male volunteers aged more than 17 years. Blood pressure, heart rate and respiratory rate of each participant, were measured before and immediately after smoking. A self administered questionnaire was used to collect personal details and data about smoking pattern. Results: Mean increases in systolic blood pressures ($12{\pm}1$ mmHg), heart rates ($20{\pm}2$ bpm) and respiratory rates ($4{\pm}1$ breaths/min) were observed (p < 0.001). A mean decrease in diastolic blood pressures ($1{\pm}1$ mmHg) was observed (p = 0.483). Conclusion: Smoking dokha has a significant acute effect on systolic blood pressure, heart rate and respiratory rate. Anti smoking campaigns must address the ill effects of this form of smoking. Results from the study warrant further research into this method of smoking which is becoming more popular.

Optimizing the Complex Systems Reliability Using Mixed Strategy in Ultra-fast Gas Turbine Protection System

Alim Al Ayub Ahmed,Dinh Tran Ngoc Huy,Nguyen Dinh Trung,Tawfeeq Alghazali,Abdulhussien N. Alattabi,Hasan Sh. Majdi,Farkad A. Lattieff,Ahmad Syarief Iskandar,Anis Siti Nurrohkayati 대한산업공학회 2022 Industrial Engineeering & Management Systems Vol.21 No.3

There are four general ways to improve reliability. One of the most popular of these solutions is to add surplus com-ponents to the subsystems of a system (known as RRAP) and the reliability-redundancy allocation problem. In a sub-system, how these surplus components are used is of particular importance. How to use surplus components in the subsystem is known as. There are three general strategies for reliability issues known as active, stored, and mixed strategy. The main aim of the study is to create a new formula on the basis of the subsystems that use these two strategies. Model 4 provides a continuous limit of the Markov chain with continuous time. This new formula enables us to perform complex strategy calculations in a very short time and accurately. Finally the exact function obtained for mixed strategy Protective system ultra-fast gas turbine has been tested. Given the results, the new equation decreased the solution time besides the accurate estimation of the system’s reliability.

Physical structure, TD-DFT computations, and optical properties of hybrid nanocomposite thin film as optoelectronic devices

M.Sh. Zoromba,H.A. Maddah,M.H. Abdel-Aziz,Ahmed F. Al-Hossainy 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.112 No.-

HCl doped-copolymer of ortho phenylene diamine and meta phenylene diamine was prepared by usingoxidative polymerization method with ferric chloride as an oxidizing agent in the existence of sodiumdedocyl sulphate as a soft template. The microporous structure thin films of hybrid copolymer/ZrO2nanocomposite [copolymer/ZrO2]NC were fabricated using a physical vapor deposition (PVD) method. The effect of addition of zirconium oxide nanoparticles [ZrO2]NPs on the physical properties of the copolymerwas discussed in the light of crystallinity and optical properties. The average crystallite size of[ZrO2]NPs is around 40 nm. The copolymer showed an absorbance of 1.18 at the wavelength (k)374 nm, which increased to 1.26 at k = 440 nm after glycine addition, also increased to 1.53 at k = 486nm after [ZrO2]NPs loading. Also, the significant changes in the absorption index and indirect/direct bandgapof the copolymer have been detected. The materials Studio 7.0 program on TDDFT/DMol3 was used tooptimize the molecular structure and perform the frequency calculations for the crystal models and isolatedmolecules. The DFT-Gaussian09W-vibration values are quite similar to the experimental data eitherin the structure or in the optical properties. The improvements in optical properties were achieved andrevealed the possibility of using the hybrid nanocomposite films in the polymers solar cell application.

Synthesis, Structural, Time-Dependent Density-Functional Theory, Thermal Annealing and Optical Properties for Doped Polymer Nanostructured Thin Films as Optoelectronic Devices

Ahmed F. Al-Hossainy,Mohamed Sh. Zoromba 한국고분자학회 2021 폴리머 Vol.45 No.4

The dependence of structural and optical characteristics on the thermal annealing of a doped poly(4-phenylenediamine-co-2-aminophenol) nanostructured thin film [P4D2AP]<SUP>TF</SUP> as a doped polymer conductor nanostructured thin film was studied. [P4D2AP]<SUP>TF</SUP> was fabricated as a thin film (100 ± 2 ㎚) using the spin coating method. Various characterization methods for [P4A2AP]<SUP>TF</SUP> like Fourier-transform infrared spectroscopy (FTIR), ultraviolet-visible spectroscopic (UV-Vis), thermogravimetric analysis (TGA), and optical characteristics have been studied. The resulted X-ray diffraction (XRD) and scanning electron microscope (SEM) data have been employed to study interface composites. Density functional theory (DFT) was used for optimization by atomic orbital DFT code (DMol³) and Cambridge serial total energy package (CASTEP). Spectroscopic and structural characteristics for the thin film have confirmed the chemical composition and XRD observations revealed the same crystal structure. The fabricated film was annealed in the air for 1h at 100 and 200 ℃. XRD examination of [P4D2AP]<SUP>TF</SUP> displayed that symmetry is an orthorhombic with a space group (Pmcn). The optical characteristics demonstrated that the thin film has a relatively high absorbance of 95%. The calculated energy gaps are 2.523 eV and 2.504 eV for DFT and experimental, respectively. In addition, the optoelectrical parameters of the film have been calculated for absorption index (k(λ)), refractive index (n(λ)), dielectric constant, and optical conductivity. CASTEP simulated values are consistent with the experimental values for optical parameters of [P4A2AP]<SUP>TF</SUP>. The findings of the structural and optical characteristics described the fabricated thin film can be utilized as a candidate material for optoelectronic devices and solar cells.

Prevalence of Cryptosporidium-Associated Diarrhea in a High Altitude–Community of Saudi Arabia Detected by Conventional and Molecular Methods

Yousry Hawash,Laila Sh. Dorgham,Ayman S. Al-Hazmi,Mohammed S. Al-Ghamdi 대한기생충학열대의학회 2014 The Korean Journal of Parasitology Vol.52 No.5

Investigation of the Fission Process at IRMM

F.-J. Hambsch,S. Oberstedt,A. Al-Adil,R. Borcea,A. Oberstedt,A. Tudora,Sh. Zeynalov 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23

The investigation of the fission process is and has been a major undertaking at IRMM. The most recent investigations concerned the reaction ^(234)U(n, f) and ^(238)U(n, f) around vibrational resonances at the barrier of the fission cross-section. Furthermore prompt neutron emission of ^(252)Cf(SF) has been investigated understanding for the first time the prompt neutron multiplicity as a function of total kinetic energy (TKE). Theoretical modelling of reaction cross sections as well as prompt neutron multiplicity and spectra has been performed using the experimental data as input parameters. Also instrument developments for correlation measurements of fission fragment properties has been pursued in recent years with the time-of-flight spectrometer VERDI and detectors for prompt fission γ-ray.

Reasons and Motivations for Cigarette Smoking and Barriers against Quitting Among a Sample of Young People in Jeddah, Saudi Arabia

Baig, Mukhtiar,Bakarman, Marwan A,Gazzaz, Zohair J,Khabaz, Mohamad N,Ahmed, Tahir J,Qureshi, Imtiaz A,Hussain, Muhammad B,Alzahrani, Ali H,Al-Shehri, Ali A,Basendwah, Mohammad A,Altherwi, Fahd B,Al-Sh Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.7

Background: Cigarette smoking is one of the leading causes of death in the world. Tobacco consumption has grave negative consequences for health so that it is important to understand the reasons and motivations towards cigarette smoking and barriers against quitting smoking among the young generation for developing effective policies to control this widespread problem. Materials and Methods: This cross-sectional survey was carried out at the Faculty of Medicine, Rabigh, King Abdulaziz University, Jeddah, Saudi Arabia. A total of 438 young smokers participated from the University and the general population. Data were collected through anonymous, self-administered questionnaires in the Arabic language that contained questions about the reasons and motivations towards cigarette smoking and barriers against quitting smoking. The questionnaire also contained several questions regarding knowledge and attitude of the participants towards cigarette smoking. The data was analyzed on SPSS-16. Results: The mean age of the respondents was $22.9{\pm}3.48$, out of 438 subjects 87 (19.9%) were married, and 351 (80.1%) were unmarried, and 331 (75.6%) belonged to urban areas while 107 (24.5%) were from the rural areas. Responding to a question about a number of cigarettes smoked per day, 31% answered 11-20, 29% answered 21-30, and 25% answered 1-10. Questioned about smokers in the family, 34.5% responded more than one, with 19% for brother and 13% for father. About the reasons for not quitting smoking, 26% described lack of willpower, 25% had no reason, 22% said that people around me smoke, and 15.3% responded stress at home/work. The major motivation for smokers was smoker friends (42%), for 33.8% others, for 12% father/brother and 7.8% media. Conclusions: There are several avoidable and preventable reasons and barriers against quitting smoking. However, knowledge and attitude about smoking were good, and the majority of the smokers were well aware of the associated hazards. Therefore, there is a need to search out ways and means to help them to quit this addiction.