العدد الحالي

مجلة جامعة صنعاء للعلوم التطبيقية والتكنولوجيا

مجلد 2 عدد 5 (2024)

2024-10-31

8 مقال

The second volume - the fifth issue in the Sana'a University Journal of Applied Sciences and Technology

المقالات

8 مقالات

Effect of deferent eluting agent on the stripping of fluoride ions

Adsorption Isotherm, Kinetic and Thermodynamic Studies for Removal of Fluoride Ions from Drinking Water Using Modified Natural Pumice

Mahfoudh M. AL-Hamadi، Anass A. Alnedhary، Hadi Ali Quria’a، ghadeer M. al-mutawakel (المؤلف)

403-412

2024-10-31

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DOI: 10.59628/jast.v2i5.1151

Dhamar governorate map showing the study area (blue balloon)

Investigation of Edaphic and Climatic Factors for Thymus laevigatus in Utmah Natural Reserve, Yemen

Adel Sultan Alqadasi، Younis Humaid (المؤلف)

413-421

2024-10-30

PDF

DOI: 10.59628/jast.v2i5.1096

الملخص

In natural habitats of wild plants, growth, and productivity are influenced by various environmental factors, including edaphic and climatic conditions. Yemen has many natural habitats that contain endemic plants. Thymus laevigatus is one of these plants distributed in higher mountain areas in the Northern part of the country. Assessment of environmental factors in these areas is still limited. So, this study aimed to analyze the edaphic and climatic factors affecting the growth of wild thyme in the Utmah Natural Reserve. Soils 0-25, and 25-50 cm deep were randomly sampled from the rhizosphere of the thyme. Edaphic factors include soil texture, organic matter, pH, EC, mobile potassium (K₂O) and phosphorous (P₂O₅), Exchangeable (Ca, Mg, Na), Available (Fe, Zn, Mn), and total Calcium carbonate (CaCO₃). The meteorological data (precipitation, temperature, and average monthly sunshine duration) for 2015-2022 were obtained from the Water and Environment Center – Sana’a University. Results showed that K₂O, Zn, and Ca concentrations are deficient; Mn is adequate; Mg is near moderate; P₂O₅is moderate; Fe and organic matter are adequate; Na is high. Soil is without salinity and pH is alkaline. The soil texture is sandy loam. The bioclimatic zone is semi-arid with a temperate winter. Wet periods are months of April, May, mid-July, August, and October with a yearly average rainfall of 377.13 mm. Minimum temperatures are between 6.83-15.01°C, while the maximum is between 23.21-31.16°C. The average sunshine hours during thyme growth season are 10.68 h/ day. The obtained results represent the basic requirements for the growth and productivity of thyme in its natural habitats. Also, it provides preliminary information that can be used to plan conservation projects for this plant and contribute to its domestication and cultivation.

الكلمات المفتاحية

Bioclimatic zone Climatic Edaphic Thymus laevigatus Yemen

Lexicon-Based Approach in Sentiment Analysis of Yemeni Dialect for Social Media Network

Alaa Abdulkareem Hameed Brihi، Mossa Ghurab (المؤلف)

422-431

2024-10-31

PDF

DOI: 10.59628/jast.v2i5.1058

الملخص

Recently, the number of Yemeni users has been expanding quickly on social media platforms. Most research in Arabic sentiment analysis has gained on Modern Standard Arabic (MSA) and some specific dialects, such as Egyptian, Levantine, and Gulf. However, there is a noticeable gap in Yemeni dialect sentiment analysis research. The reason for that is the lack of reliable Yemeni lexical and corpus and a real dataset for social media sentiment analysis. This research addresses this lack by presenting the Yemeni Dialect sentiment lexicon and corpus. This lexicon and corpus provide valuable resources for researchers and practitioners seeking to analyze sentiment in Yemeni dialect social media content, contributing to a better understanding of Yemeni public opinion, social media monitoring, marketing, cultural understanding, and assisting in efforts to respond to crises in Yemen. The Yemeni Dialect sentiment lexicon is enriched with a reasonable number of words and phrases categorized according to their positive and negative sentiment tendencies. Moreover, we constructed a corpus dataset of more than 54,000 comments built from the Facebook platform. A large dataset of unlabeled comments from the main Yemeni telecommunications companies in Yemen (Yemen Telecom, Yemen Mobile, YOU, and Sabafon), are people commenting on a public issue related to the services provided by those companies. The lexicon-based approach is used to extract the sentiment’s polarity and label each of the provided comments to formulate a corpus dataset as being either positive, negative, or neutral. The evaluation metrics of experiments are accuracy, recall, precision, f-measure, and the confusion matrix. The accuracy result of the lexicon-based labeling approach was calculated through a comparison between the achieved results and the ones achieved through manually labeled comments by three Yemeni experts. Evaluation results using a lexicon-based approach achieved an accuracy of 90.05%.

الكلمات المفتاحية

Arabic Sentiment Analysis Yemeni Dialect Lexicon-Based Yemeni Lexicon and courps

The contour plots of the intensity distribution of the PCGSMV formed by lensacon in presence of astigmatic aberration coefficient µ = 1.1 and axicon base angle α = 0.02 rad at several propagation distances z, m = 1, w = 6 mm, for different σ.

Influence of astigmatic aberration on partially coherent Gaussian-Schell vortex beam focused by lensacon

H. O. Al-Nadary، شكري عبدالقادر قايد، Abdu A. Alkelly، Hassan T. Al-Ahsab، M. S. Qusaila (المؤلف)

432-439

2024-10-30

PDF

DOI: 10.59628/jast.v2i5.1274

three-dimensional representation of ray-tracing LoS probability.

Line-of-Sight Probability Models for 5G/6G Millimeter-Wave Networks: A Review

Basheer Raddwan، Ibrahim Ahmed Al-Baltah (المؤلف)

440-452

2024-10-31

PDF

DOI: 10.59628/jast.v2i5.1054

الملخص

في البيئات الحضرية ثلاثية الأبعاد (3D)، تعتمد دقة تخطيط التغطية لشبكات الموجات المليميترية (mm-wave) على دقة نماذج حساب احتمالية خط الرؤية line-of-sight (LoS) خصوصاً لشبكات الاتصال التي تدعم الطائرات بدون طيار (UAVs). وحيث أن الأدبيات الحالية للمراجع التي تناولت نماذج خط الرؤية لا توفر مراجعة لتلك النماذج كما لا توفر تقييم لدقة التنبؤ لتلك النماذج، تقدم هذه الورقة مراجعة للدراسات التي قدمت النماذج الرياضية لحساب احتمالية وجود خط الرؤية بإعتبار العوائق الكبيرة الثابتة. كما أن هذه الورقة تقدم تقيماً لتلك النماذج باستخدام الـ ray-tracing simulation على أربع بيئات حضرية ثلاثية الأبعاد وهي المدن ذات المباني العالية، المدن كثيفة المباني، المدن الإعتيادية، والضواحي. وقد أظهرت نتائج التقييم بأن النماذج الحالية لا توفر الدقة الكافية للتنبؤ بحالة خط الرؤية مما يستدعي بذل جهد إضافي لتطوير نموذج احتمالية LoS يتسم بتعدد المتغيرات.

الكلمات المفتاحية

Line-of-sight probability model ray-tracing air-to-ground communication channels unmanned aerial vehicles ground-to-ground air- to-air large static blockages urban

shows how often telecommunications organizations review and update their sustainability policies and practices

Leveraging Contemporary Project Management Techniques and Technology for Sustainable Telecommunications Advancement in Yemen

Nabeel Alsohybe، Rana Hashem Mahmood Mohmed (المؤلف)

453-466

2024-10-30

PDF

DOI: 10.59628/jast.v2i5.1214

الملخص

The digital techniques and technology have transformed formal project management field dramatically by enhancing communication, resource management and efficiency. This study aims to evaluate the efficacy of contemporary project management methodologies in promoting and facilitating sustainable development within the telecommunications sector in Yemen. Situated within the broader discourse on achieving the United Nations Sustainable Development Goals, the research employs a mixed methods approach to gather both quantitative and qualitative data. Quantitative data was collected through a survey of 150 professionals across major telecommunications firms in Yemen. The survey examined familiarity and application of techniques and technology such as waterfall, agile, six sigma, and lean. Qualitative insights were derived from 22 in-depth interviews with project managers and stakeholders. The findings of the study indicate that there is a narrow scope for integrating sustainability in Yemen’s telecommunications sector projects. Despite the research indicating a considerable level of awareness and utilization of contemporary methodologies, the integration of sustainability objectives varies considerably between projects. While numerous projects adopt environmental sustainability strategies, such as enhancing energy efficiency to reduce environmental impact and minimize carbon emissions, they lack comprehensive sustainability strategies that encompass economic, social, and environmental aspects in an integrated manner. The qualitative interviews yielded insights into the significant challenges to sustainable implementation, including insufficient training, organizational obstacles, and the effects of the ongoing conflict. In light of these findings, the paper addresses these challenges and provides recommendations and effective strategies to overcome them.

الكلمات المفتاحية

Agile Project Management (APM) Code Division Multiple Access (CDMA) Lean Thinking Concept Modern project management methodologies SIX SIGMA MODEL Sustainable Develop-ment Telecommunications sector

Heavy metals concentration in pesticide samples

Measurements of Heavy Elements and Radioactivity Concentration Levels in Types of Fertilizers and Pesticides Commonly Used in Sana’a Yemen

Ahmed Abdul-Rahim، Bassam Mohammed Mughalles Hijab (المؤلف)

467-481

2024-10-30

PDF

DOI: 10.59628/jast.v2i5.1169

الملخص

This study aims to measure heavy metals (HMs) concentration and radioactivity concentration levels in fertilizer and pesticide samples collected from local markets in Sana’a, Yemen. Gamma spectroscopy employing a Survey Sodium Iodide NaI (TI) RIIDEYM-G detector was used for radiation and dose assessments. As for heavy metal analyses, this study used Inductively Coupled Optical Emission Spectroscopy (ICP-OES). Thirty samples were collected from local markets in Sana’a, Yemen. Radioactivity measurements show low levels of radioactivity concentration. The average dose rates due to fertilizer and pesticide samples were 1.14 and 1.07 mSv/y, respectively. These values are nearly equal to the recommended annual radiation dose rate limit (1mSv/y) recommended by the International Commission on Radiological Protection (ICRP). For heavy metal analysis, it was found that the average concentrations of heavy metals (HMs) (cadmium (Cd), chromium (Cr), copper (Cu), iron (Fe), nickel (Ni), lead (Pb), and zinc (Zn)) in the fertilizer samples were 1.08 mg/kg, 4.944 mg/kg, 13.8495 mg/kg, 274.371 mg/kg, 3.30446 mg/kg, 15.35686 mg/kg, and 24.4547 mg/kg, respectively. Heavy metal concentrations in fertilizer samples were mainly less than European (EU) guideline limits, with the exception of a few samples. The average concentrations of heavy metals (Cd, Cr, Cu, Fe, Ni, Pb, and Zn) in the pesticide samples were 0.8 mg/kg, 0.5784 mg/kg, 52.280 mg/kg, 73.4651 mg/kg, 2.4482 mg/kg, 3.199 mg/kg, and 1.1309 mg/kg, respectively. The heavy metal concentrations in pesticide samples were less than the corresponding values in fertilizer samples.