Measurement and assessment of ultraviolet radiation in Riyadh, Saudi Arabia

2003 ◽  
Vol 23 (1-2) ◽  
pp. 31-38 ◽  
Author(s):  
M. Bin Mahfoodh ◽  
M. S. Al-Ayed ◽  
A. M. Al-Dhafiri
Keyword(s):  
Saudi Arabia ◽  
Ultraviolet Radiation

Knowledge regarding the importance of ultraviolet radiation and protective behaviors for the eye health in Saudi Arabia

2021 ◽  
pp. 133-139
Author(s):  
Rawan Al-Abdulqader ◽  
Fahad Wadani ◽  
Noura Alkulaib ◽  
Mareyah Husain ◽  
Yasmeen Almulhim ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Ultraviolet Radiation ◽  
Protective Behaviors ◽  
Eye Health

Correlation Between Ultraviolet Radiation and Global Radiation in Riyadh, Saudi Arabia

1994 ◽  
Vol 116 (1) ◽  
pp. 63-66 ◽  
Author(s):  
A. M. Mujahid
Keyword(s):  
Saudi Arabia ◽  
Ultraviolet Radiation ◽  
Global Radiation ◽  
Mean Value ◽  
Horizontal Surface ◽  
Monthly Average ◽  
Hourly Basis ◽  
Regression Correlation ◽  
Good Agreement

The global ultraviolet and global radiation were measured and recorded on an hourly basis in Riyadh, Saudi Arabia (lat. 24.6°N, long. 46.7°) during the period 1984–1989. Global radiation, G, was measured by an Eppley PSP pyranometer (0.285≤λ≤2.8 μm) and an Eppley TUVR radiometer (0.29≤λ≤0.385 μm) was used for the measurement of the ultraviolet radiation, UV. Both instruments were mounted on a horizontal surface. The results showed that the monthly average daily ultraviolet radiation was 197.6 Whm−2. The ratio of the monthly average daily ultraviolet radiation to the monthly average daily global radiation (Ku) varied between 0.031 to 0.037, with a mean value of 0.034. Comparison with results obtained in Kuwait, Dhahran, and Makkah showed that the data of Riyadh are in good agreement with those of Makkah and Dhahran; however, it underestimates Kuwait data. A regression correlation between Ku and KT (the ratio of the monthly average daily values of global radiation to extraterrestrial radiation) is developed. Another regression correlation between ultraviolet and global radiation on an hourly basis is also developed.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

Confidence toward vaccination as reported by parents of children admitted to a tertiary care hospital in Riyadh, Saudi Arabia: A cross sectional study

Vacunas ◽  
2020 ◽  
Vol 21 (2) ◽  
pp. 95-104 ◽  
Author(s):  
Y.M. AlGoraini ◽  
N.N. AlDujayn ◽  
M.A. AlRasheed ◽  
Y.E. Bashawri ◽  
S.S. Alsubaie ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Tertiary Care Hospital ◽  
Tertiary Care ◽  
Cross Sectional Study ◽  
Care Hospital ◽  
Sectional Study ◽  
Cross Sectional

803: Interactions Between Ultraviolet Radiation and Polymorphisms in the Vitamin D Receptor Gene Mediate Prostate Cancer Susceptibility

2006 ◽  
Vol 175 (4S) ◽  
pp. 260-260
Author(s):  
Nicholas J. Rukin ◽  
Samuel J. Moon ◽  
Dhaval Bodiwala ◽  
Christopher J. Luscombe ◽  
Mark F. Saxby ◽  
...  
Keyword(s):  
Prostate Cancer ◽  
Vitamin D ◽  
Ultraviolet Radiation ◽  
Vitamin D Receptor ◽  
Cancer Susceptibility ◽  
Receptor Gene ◽  
Vitamin D Receptor Gene ◽  
Prostate Cancer Susceptibility

Abstract #955: Sheehan Syndrome in a Jizan Region of Saudi Arabia.

2016 ◽  
Vol 22 ◽  
pp. 224
Author(s):  
Subodh Banzal ◽  
Sonal Banzal ◽  
Sadhana Banzal ◽  
Ayobenji Ayoola
Keyword(s):  
Saudi Arabia ◽  
Sheehan Syndrome

Assessment of the Dietary Intakes of 6- and 12-Month-Old Infants in Saudi Arabia

2017 ◽  
Vol 87 (1-2) ◽  
pp. 37-48
Author(s):  
Riyadh A. Alzaheb ◽  
Norah Alatawi ◽  
Khawla A. Daoud ◽  
Naema Altawil
Keyword(s):  
Vitamin D ◽  
Saudi Arabia ◽  
Age Groups ◽  
Dietary Intakes ◽  
Dietary Survey ◽  
Daily Energy ◽  
Omega 6 ◽  
24 Hour Recall ◽  
Adequate Nutrient ◽  
Selection Of

Abstract.Background: Establishing understanding of infants’ dietary intakes can support interventions to improve their diets and overall health. Because information on the dietary intakes of infants aged ≤12 months in Saudi Arabia is scarce, this study examined the diets of infants aged 6 and 12 months in Saudi Arabia and determined their main dietary sources of total energy and macronutrients. Methods: A crosssectional dietary survey employing a single 24-hour recall was performed between May and December 2015 with a sample of mothers of 278 healthy 6-month-old and 259 12-month-old infants. An analysis of the dietary intake data determined the nutrient intake adequacy and the percentage contributions of foods to energy and macronutrient intakes. Results: The respective mean daily energy intakes of the 6-month-old and 12-month-old infants in the study were 703 kcal and 929 kcal. Both age groups recorded adequate nutrient intakes, with the exception that the 6-month-olds’ mean vitamin D intake fell below the recommended Adequate Intake (AI), and the 12-month-olds’ intakes of omega-6 fatty acids and vitamin D were also below the AI, along with their iron intake which fell short of the Recommended Dietary Allowance (RDA). Conclusion: The data generated here will assist health professionals in planning interventions which aim to improve infants’ diets and to offer guidance to parents on the appropriate selection of food for their infants.

Suicidal Ideation Among Medical Students in Dammam, Saudi Arabia

Crisis ◽  
2020 ◽  
pp. 1-6
Author(s):  
Mohammed Madadin ◽  
Ritesh G. Menezes ◽  
Maha A. Alassaf ◽  
Abdulaziz M. Almulhim ◽  
Mahdi S. Abumadini ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Medical Students ◽  
Suicidal Ideation ◽  
General Health Questionnaire ◽  
Cross Sectional Study ◽  
Eastern Province ◽  
Cross Sectional ◽  
The Past ◽  
Depression Subscale ◽  
History Of

Abstract. Background: Medical students are at high risk of suicidal ideation. Aim: We aimed to obtain information on suicidal ideation among medical students in Dammam located in the Eastern Province of Saudi Arabia. Method: This cross-sectional study was conducted at the College of Medicine affiliated with Imam Abdulrahman Bin Faisal University in the Eastern Province of Saudi Arabia. Suicidal ideation in the past 12 months was assessed based on responses to four questions in the depression subscale of the General Health Questionnaire 28 (GHQ-28). In addition, data were collected to examine the association of suicidal ideation with various factors. Results: We found that 1 in 3 medical students in the study had suicidal ideation in the past 12 months, while around 40% had lifetime suicidal ideation. Suicidal ideation was associated with feelings of parental neglect, history of physical abuse, and dissatisfaction with academic performance. Limitations: The cross-sectional nature of this study limits its ability to determine causality regarding suicidal ideation. Conclusion: These rates are considerably high when compared with rates from studies in other countries around the world. This study provides a reference in the field of suicidology for this region of Saudi Arabia.

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