Sana'a University Journal of Applied Sciences and Technology

The Al-Maqatirah and Al-Ahkum areas are located in SE of Taiz within the southwestern outcrops of the basement rocks of Yemen, which represent the southern extension of the Arabian Nubian Shield (ANS). This paper focuses on the study of gabbroic intrusions that have invaded these basement rocks in these areas. These gabbroic intrusions were unmetamorphosed, variably altered, and sometimes affected by Na-rich fluid fluxes. They exhibit many types of textures and structures, and according to the abundance and appearance of major mineral constituents, these gabbroic rocks are classified into several types. Chemically, these gabbroic intrusions are classified as low-Ti intrusions generated from low-Ti magma, which is characteristic of an intra oceanic island arc setting and formed in a subduction zone setting by partial melting and re-melting of a depleted peridotite mantle source. However, some samples show indications of subsurface mixing of contemporaneous magma batches with low Ti and high Ti compositions. The major element compositions of these gabbroic rocks reflect their derivation from primitive magma subjected to significant degrees of fractional crystallization. These gabbroic intrusions have an ocean island basalt (OIB) signature and transitional character of magma from alkaline to sub-alkaline (tholeiitic) magma series, which indicate their derivation by variable degrees of partial melting of the mantle source at various depths during the change from arc to intraplate setting. The OIB signature of these mafic intrusions suggests lithospheric attenuation and significant upwelling of the asthenosphere caused by continental rifting, which mostly occurs during the formation of the Arabian lithosphere. Finally, the studied gabbroic intrusions can be compared with similar gabbroic intrusions in the Arabian-Nubian shield from Saudi Arabia, which are emplaced post-collision at the end of the Pan-African Orogeny and generated from mafic magma derived from a peridotite mantle source.

The phytochemical content, antioxidant capacity, and antimicrobial efficacy of leaf extracts from two forms of Mirabilis jalapa (M. jalapa) - red and yellow flowered- were investigated. Using the cold maceration method with 70% methanol, the presence of alkaloids, flavonoids, carbohydrate, protein, amino acid, phenol, tannins, saponins, , and steroids was confirmed. Fourier-transform infrared (FT-IR) spectrum analysis detected hydroxyl groups (OH), aromatic and aliphatic C-H bonds, aromatic C=C bonds, carbonyl group (C=O), amines (-C-N), and C-O group in both forms red and yellow leaves of M. jalapa.
The antioxidant activity assessed using the1,1-Diphenyl-2-picrylhydrazyl (DPPH) radical scavenging method showed higher free radical scavenging activities for the red -flowered leaves compared to the yellow-flowered ones at different concentrations. Four human pathogenic microorganisms; Staphylococcus aureus(S. aureus), Escherichia coli(E. coli), Pseudomonas aeruginosa(P. aeruginosa), and Candida albicans(C. albicans) were evaluated for antimicrobial activity by agar well diffusion method.The red-flowered form exhibited higher activity against the tested pathogens compared to the yellow form, likely due to its higher content of phenols and flavonoids in the methanol extracts. The minimum inhibitory concentration (MIC) was found to be 0.195 mg/ml against S. aureus and 0.049 mg/ml against E. coli and P. aeruginosa; for both forms, it was 0.025 mg/ml against
C. albicans.

The emergence of data in recent years, characterized by the "6Vs" (Volume, Velocity, Variety, Veracity, Value, and Variability), has started the era of big data. While this data holds great potential for uncovering valuable insights and knowledge, its size presents significant challenges for analysis. This paper explores two critical big data reduction techniques: feature selection and sampling. Feature selection focuses on identifying and eliminating irrelevant or redundant features, reducing data dimensionality. Sampling, on the other hand, selects a representative subset of data points for analysis. We compare and contrast these techniques, highlighting their strengths and weaknesses. The paper explores when each approach is most suitable and suggest the potential benefits of combining them for even more efficient big data analysis.

Boswellia sacra, belonging to the genus Boswellia (family: Burseraceae), is a natural source of fragrant resin known as frankincense (Luban), which has held significant economic, medicinal, and religious importance since ancient Yemeni civilization. Predominantly distributed in the South Arabian Peninsula, frankincense resin contains diverse chemical compounds, including terpenoids, essential oils, gum acids, sesquiterpenes, phenolic compounds, and aldehydes, each contributing to its medicinal, therapeutic, and aromatic properties. The aromatic oleo-gum-resin from B. sacra is renowned for its use in traditional medicine to treat gastric disorders, hepatic ailments, and more. Additionally, frankincense finds applications in the cosmetic, perfume, beverage, and food industries due to its rich bioactive compounds, particularly boswellic acids and their derivatives. Although several studies have explored the constituents and pharmacological activities of frankincense, comprehensive research consolidating the valuable information on B. sacra is scarce. This review highlights the phytochemistry, traditional uses, and pharmacological activities of B. sacra, with a focus on its description, distribution, biochemical composition, and biological activities within the Arabian Peninsula. The aim is to provide a holistic understanding of B. sacra’s potential therapeutic applications and pharmacological properties.

This study focuses on measuring the radioactivity in milk, given its critical importance and sensitivity as a fundamental component of humannutrition, particularly due to its vital role as a primary food source for children during the early stages of life. The radionuclides of ²³²Th, ²²⁶ Ra and ⁴⁰K were measured in 16 brands of powdered milk consumed in Yemen, imported from various regions worldwide. The measurements were conducted using gamma-ray spectroscopy with an HPGe detector, equipped with a specially designed shield. The range of  ²²⁶ Ra from (0.42±0.08 to 1.86±0.30 with an average of 0.77±0.12) Bq/kg, the range of ²³²Th from (0.21±0.05 to 0.40±0.07 with an average of 0.30±0.05) Bq/kg, and the range of ⁴⁰K (from 140.69±3.90 to 195.96±5.29 with an average of 169.06±4.63) Bq/kg, respectively, for infant group (≤ 1 year). The range of ²²⁶Ra from (0.14±0.03 to 7.21±1.34 with an average of 1.88±0.54) Bq/kg, the range of ²³²Th from (0.25±0.04 to 1.22±0.34 with an average of 0.68±0.15) Bq/kg, and the range of ⁴⁰K (from 141.52±3.90 to 534.39±13.54 with an average of 320.36±8.35) Bq/kg, respectively, for individuals above 2 years, respectively. The total average annual effective dose due to ingestion of radionuclides was calculated for three age groups and found to be (214.50, 123.27, and 41 μSv/year) for infant group (≤ 1 year), children (2-17 years), and adults (>17 years), respectively. Overall, these values are lower than the WHO/FAO and ICRP recommended limit of (1.0 mSv/year) for all age groups, indicating that the radioactivity levels in the tested powdered milk are within acceptable safety limits.

In 2016, an off-grid PV system (14.64 KW) of (48) multicrystalline silicon (mc-Si) modules were installed on the roof of the Yemen Standardization, Metrology and Quality Control Organization (YSMO) in Sana’a – Yemen. In this work, thirty-eight modules from this system were selected for studying the performance degradation after 8.65 years of operation. Degradation analysis of the selected modules was done using visual inspection and current–voltage (I-V) characterization techniques. Results show that the degradation rates in P_max of the modules under study, over the outdoor exposure period (8.65 years), were found to be between 2.44% and 7.99% with mean of 5.42% and median of 5.24%. By comparing the annual degradation rates with the industry linear warranty based on nominal power of this module, out of the 38 PV modules studied, only 2 modules have been degraded more than 0.7%/year, which implies that these two modules are likely to fail before 25 years in operation under outdoor conditions of Sana’a, Yemen. The remaining 36 PV modules degraded less than 0.7%/year, which are likely to operate reliably for 25 years under outdoor conditions of Sana’a, Yemen. The analysis of electrical performance indicated that the P_max reduction of the studied modules are mainly related to the losses in the I_SC and I_mp. Losses in I_mp can be ascribed to the decreases of the shunt resistance (R_sh). On the other hand, the reduction in I_SC of the modules under study can be correlated to the encapsulation discoloration. The most noticeable visual defect in the studied modules was a discoloring of EVA encapsulant. The encapsulant discoloration reduced the incident photons  that reach the solar cells and thus, decreased the I_SC and output power (P_max) of the modules. Corrosion of the metallisation was also observed in some modules. This defect can lead to reducing the FF of the modules

In the field of electricity generation, one promising area is wind energy, since it is accessible and renewable worldwide. This study evaluated the wind power potential (WPP) at the selected locations (Sana’a and Amran). This study makes use of wind speed data that was recorded at a height of 10 meters over five years (2010–2014). The mean and maximum values of the recorded wind speeds are shown in this study. Analysis was done on the monthly, seasonal, and annual changes in wind speed. Weibull distribution function (WDF) has been used to examine the wind properties and power potential of the suggested locations. Using the real data that was recorded over the five years, the annual mean wind speeds (MWS) in Sana’a were determined to be 2.513, 2.6, 2.445, 2.462 and 2.6 m/s respectively and in Amran, they were determined to be 2.899, 2.656, 2.88, 2.945, 3.05 m/s respectively. The mean power and energy densities over the five years were found to be 8.207 W/m² and 71.889 kWh/m²; 11.803 W/m² and 103.396 kWh/m² for Sana’a and Amran respectively. The power density (PD) determined using the WDF and the power density PD determined using actual wind data were almost identical. Based on the findings, the MWS at the two sites chosen for the study is less than 4.0 m/s, which is far slower than the cut-in wind speed of many wind turbines from modern models. So, we recommend that some studies should be conducted to evaluate the potential for wind energy at some sites in Sana’a and Amran governorates outside the cities especially in or near mountainous site.

The development of large language models (LLMs) that are optimized to obey human commands is a significant advancement in the field of artificial intelligence (AI). One such model is ChatGPT (Chat Generative Pre-trained Transformer) from OpenAI, which has shown itself to be an extremely powerful tool for a variety of tasks such as conversation production, code debugging, and answering questions. Despite the fact that these models are praised for their multilingualism, little research has been done on how well they can analyze sentiment, especially in Arabic. We intend to close this gap by thoroughly assessing ChatGPT’s sentiment analysis skills, particularly with regard to Arabic text, in light of this constraint. When developing applications, recognizing the quality of the application and satisfying user needs are essential. Understanding user requirements is crucial to improving the quality of programs. The use of application review-based sentiment analysis (SA) is one efficient method for accomplishing this. The purpose of this study was to evaluate consumer perceptions of mobile banking apps so that they could be updated and maintained appropriately. Since mobile banking apps are now a necessary part of people’s lives, it is essential to examine user reviews of these apps for SA purposes. User reviews of banking mobile apps on the Google Play Store provided the dataset used in this study. We suggest a new active labeling technique for ChatGPT and examine the effects of using the ChatGPT variants for Arabic sentiment analysis (ASA). Using the accuracy, recall, precision, and F-score measures, we assess the performance of four machine learning (ML) approaches: Naive Bayes (NB), K-Nearest Neighbors (K-NN), Support Vector Machine (SVM), and Random Forest (FR). Additionally, we contrast six approaches to data labeling: manual human labeling, ChatGPT labeling by Assistant-Poe, ChatGPT labeling by Bing-Edge, ChatGPT labeling by Assistant-Poe with humans, ChatGPT labeling by Bing-Edge with humans, and ChatGPT labeling by Assistant-Poe with Bing-Edge. Using different Bing-Edge models for ASA, our experimental results demonstrate that the NB approach performed the best, with an accuracy of 91.22%, recall of 89.62%, precision of 88.90%, and F-score of 89.26%. Additionally, we contrast two approaches of data labeling for ASA: human labeling and labeling with Bard Google. Using Bard Google models for ASA, our experimental results demonstrate that the Naive Bayes technique outperformed the others, attaining an accuracy of 98.07%. Furthermore, when compared to alternative labeling techniques, our suggested active labeling strategy with ChatGPT produced greater accuracy. Our research indicates that our suggested active labeling method and the NB technique with multiple Bing-Edge models are useful strategies for ASA using ChatGPT. Our research provides important insights into efficient methods for this endeavor and advances the field of sentiment analysis in Arabic literature. Additionally, compared to other labeling techniques, our suggested active labeling method using Bard Google produced greater accuracy. According to the proposed study, our suggested active labeling strategy and the Naive Bayes technique with Bard Google models are both efficient methods for Arabic sentiment analysis utilizing Bard Google.

أجريت الدراسة على مجموعة المتدربين من قيادات الإرشاد الزراعي وشملت ( 39 مبحوثا ) هم مجموعة المتدربين من قيادات الإرشاد الزراعي في الديوان العام للوزارة ومكاتب الإرشاد الزراعي في المحافظات والمشاركين في دورتين تدريبيتين خلال 2019 ، وجمعت بيانات الدراسة بواسطة استمارة استبيان تم تعبئتها ذاتيا بواسطة المبحوثين وتشتمل على جزأين ، الأول للخصائص الشخصية للمبحوثين والثاني لتقدير معرفة المبحوثين لأهمية مجالات العمل في الإرشاد الزراعي وتحديد مقدرتهم على تنفيذ وتطبيق المجالات المذكورة في برامجهم الإرشادية، واستخدم التكرارات والنسب المئوية والمتوسط الحسابي ونموذج Borich   لتقدير وتحليل وتفسير النتائج .

وكانت أهم نتائج الدراسة أن غالبية المبحوثين (84.61%) كانت لديهم معرفة بالمجالات بدرجة متوسطة وتامة، بينما 15.38% من المبحوثين كانت معرفتهم بالمجالات قليلة. وأن 82% من المبحوثين يدركون أهمية مجالات العمل الإرشادي بدرجة مهمة ومهمة جدا ، بينما كان 18 % من المبحوثين يرون بأنها قليلة الأهمية، في حين أن 64.1% من المبحوثين كانت مقدرتهم على التطبيق تقع في فئتي الدرجة المتوسطة والقليلة ، بينما كان 35.1% من المبحوثين درجة مقدرتهم تقع في الفئة الكبيرة ، وأن درجات الاحتياج التدريبي في مجال تنمية وصيانة واستخدام الموارد الطبيعية جاء في أول الاحتياجات التدريبية(5.4 درجة)، يليه مجال رفع كفاءة تسويق المنتجات الزراعية (4.90 درجة) ، ويليه مجال تنمية وتحسين حياه الأسرة الريفية (4.71 درجة).

 كما وجدت علاقة معنوية موجبة بين درجة معرفة المبحوثين لمجالات العمل الارشادي عند مستوى (0.05) وبين كل من العمر والمستوى التعليمي وكانت قيمة معامل الارتباط (0.296 و0.359) وعلاقة معنوية سالبة عند مستوى (0.01) بين درجة المعرفة وموعد أخر دورة شارك فيها وكانت قيمة  معامل الارتباط (-0.374) وعلاقة سلبية عند مستوى (0.05) بين درجة المعرفة وعدد الدورات التدريبية وكانت قيمة معامل الارتباط (-0.180). وعلاقة معنوية موجبة بين درجة إدراك المبحوثين لأهمية مجالات العمل الارشادي عند مستوى (0.05) وبين المستوى التعليمي وكانت قيمة معامل الارتباط (0.321)، وعلاقة معنوية موجبة بين درجة قدرة المبحوثين عند مستوى (0.05) وبين التخصص وكانت قيمة معامل الارتباط (0.309).

استهدف البحث بشكل رئيس التعرف على تحديد أسباب عزوف النحالين عن استخدام الخلايا الحديثة في ثلاث من المحافظات الرئيسة في إنتاج العسل, والتعرف على مدى إمكانية إدخال الخلايا الحديثة في أوساط النحالين في هذه المحافظات. وأجري البحث على عينة مكونة من 100 نحال ممن أمضوا سنتان فأكثر في مهنة النحالة في المحافظات الثلاث المختارة يتوزعون على تسع مديريات وذلك عن طريق الاستبيان وجمع البيانات أثناء المقابلة الشخصية لكل مبحوث على حدة، وذلك خلال الفترة سبتمبر – نوفمبر 2020.

وقد أوضحت النتائج أن أهم أسباب عدم انتشار الخلايا الحديثة هي: عدم توفرها في الأسواق المحلية بنسبة 47% من المبحوثين، وعدم المعرفة باستخدامها (46%)، ولأنها غالية الثمن (44%)، ولأنها تنفتح أثناء النقل (31%)، ولأنها ثقيلة الوزن (22%). ولأنها تتطلب وقت أطول في العمل بها (16%), وعدم اليقين في نجاحها (14%), وقد أجاب 18% منهم بـ (لا أدري). كما أوضحت النتائج أن نسبة مستخدمي الخلايا الحديثة لم يتعدى 12% من إجمالي المبحوثين، وأن أهم مشاكل استخدام الخلايا الحديثة لديهم هي: إضافة الأساسات الشمعية (58.3% من المستخدمين)، وتربية واستبدال الملكات (50%)، وتنفتح أثناء النقل (50%)، وتحتاج لوقت أطول في العمل (25% )، وضعف النحل(25%)، وأنها ثقيلة الوزن(16.7%).

وتوضح النتائج السابقة أن أهم أسباب عدم استخدام الخلايا الحديثة تتمثل في نقص المعارف الأساسية في كيفية استخدامها. كما تشير النتائج عموماً إلى وجود فجوة في العمل الإرشادي وفي برامج التدريب في مجال تطوير تربية النحل في منطقة البحث. الأمر الذي يقتضي العمل على إيجاد برامج إرشادية وتدريبية لتحديث قطاع تربية النحل.

كلمات مفتاحية: عزوف - نحل العسل – التبني - استخدام - الخلايا الحديثة.