Indra Priyadharsini Thamizhan, Melodena Stephens
كلية محمد بن راشد للإدارة الحكومية · الامارات
أوسامة أحلوش, لطفي شعباني
كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة أمحمد بوقرة - بومرداس · الجزائر
شهيناز صواك , ديهية مهوال , لويزة معروف خلفان
كلية العلوم الانسانية والاجتماعية-جامعة مولود معمري - تيزي وزو · الجزائر
يهدف بحثنا إلى فهم تغيرات أداء الانتباه ومدة النوم الليلي لدى تلاميذ السنة الخامسة ابتدائي في إحدى مدارس تامدة الجديدة. أظهرت الدراسة أن هناك تغيرات دقيقة في أداء الانتباه خلال ساعات اليوم، حيث يشهد الأطفال انخفاضًا في الصباح يليه ارتفاع تدريجي خلال النهار، مما يعكس تكييفهم مع البيئة المدرسية بعد نهاية الأسبوع. كما كشفت النتائج عن تباينات واضحة في أداء الانتباه خلال أيام الأسبوع، حيث يكون الأداء في أعلى مستوياته في نهاية الأسبوع الدراسي وينخفض بداية الأسبوع، مما يعزز أهمية إدارة الوقت وتنظيم النشاطات التعليمية بما يتوافق مع نمط النشاط الذهني للطلاب. بالإضافة إلى ذلك، كانت مدة النوم الليلي للتلاميذ أقل من المتوسط الموصى به، مما يبرز أهمية إعطاء الأطفال الفرصة الكافية للراحة والنوم الصحي، الذي يعزز التركيز والأداء الأكاديمي المثلى. كما تبين من خلال ما تطرقنا إليه في موضوع الدراسة أنه من الضروري احترام الوتيرة البيولوجية والنفسية للتلميذ الابتدائي والتأكيد ضرورة أخذ المدة الكافية من النوم الليلي التي بفضلها يستطيع استرجاع قواه من خلال الدراسة اليومية، وأن قلة ونقص النوم يؤثر سلبا على التركيز والانتباه اللذان يكونان اساس العملية التعليمية.
Abdullah Akoud Osman , Omer Mohamed Elhassan Ahmed
كلية الهندسة والتكنولوجيا-جامعة الجزيرة · السودان
Temperature, soil moisture / humidity and soil fertility and availability of plant nutrients (according to pH and EC status) are the most common climate and soil variables that most growers generally pay attention to. However, manual or traditional field management concerning these variables will not give the growers the full picture of the amounts available to satisfy plants requirements according to developmental stages needs. Therefore, continuous automated monitoring and control of these soil and climate factors will allow for maximum outcomes of the inputs particularly water and fertilizers in cost effective manner thus ensuring high crop yield potential with safe environmental conditions. The objective of this study is to develop an automated fertigation system based on the internet of things (IoT) for providing and maintaining optimum soil moisture and fertility / soil health that enhance better plants’ growth and production besides improving surrounding environments. The system consists of four sections, three sensor nodes node1, node2, node3 are the same components (Arduino, soil moisture sensor, pH sensor, Ec sensor, XBee, solenoid valves, relay) and main node for receiving data from sensor nodes via XBee and send data to server through Ethernet shield. The control of irrigation was done automatically. If the soil moisture is greater than the maximum level 70% the watering pump (irrigation) is turned off and if it is less than 30% the water pump (irrigation) is turned on. For soil fertilization, if pH 7.5 (alkaline) then valve 1 is opened to add Acidic fertilizer such as Nitric Acid HNO3to required valueof pH.The main node received these values and sends it via Ethernet to data base. The system designed using proteus7 software, Arduino software, virtual serial port emulator software and Dreamweaver8 software used to design web site that tied with circuit design. Also use MYSQL database to save all frames measured values of sensor and action response according to these measured values of sensor nodes. This system reduces time, conserves water, this system reduces cost and time, conserves water, saves energy, avoids over fertilization.In addition to that, the system can easily be programmed to any climatic changes. All components are available in the local market and of a good price. This study recommends implementing this design in Sudan instead of using traditional methods of farming management.The system can be extended to cover more areas by sectoring the large area into small sectors consists of main nodes and sub-nodes, all sectors main node send the collected data to the main regional central node.
عبدالسلام صالح طنطاني, هاجر احمد الشريف
كلية الآداب-جامعة الزاوية (السابع من ابريل سابقا) · ليبيا
Listening has been one of the neglected skills in teaching English as a foreign language in the Libyan context. However, teaching and assessing listening skills play important roles in the process of language teaching and learning. Therefore, EFL teachers should play effective roles in enhancing students’ achievements in listening skills by using different teaching strategies and various types of assessment. This research investigates the listening assessment strategies that EFL teachers’ use with undergraduate level at Zawia university. Moreover, it explores the challenges that teachers might encounter whenever they assess their students in listening classes. For this purpose, both quantitative and qualitative research methods were utilized in this research. Two sampling techniques were employed to select the research sample, namely simple random sampling and sampling. To collect the research data, a structured questionnaire was used to identify the teachers’ background knowledge and their use of assessment strategies in listening classes. In order to probe deeper and explore the challenges that teachers might encounter during listening assessment, six teachers who teach listening skills at Zawia university were interviewed in a semi-structured way. SPSS Software Program was used to analyse the quantitative data and Thematic Analysis Method was employed to analyse the qualitative data.The quantitative findings revealed that teachers use meta-cognitive, cognitive and socio- strategies when they assess students’ listening performance in different frequencies. For example, the results showed that the majority of the teachers always set goals for listening tasks, while it is evidenced that most of them rarely clarify the objectives of the anticipated listening tasks to the students. It was also found that most of the teachers neglected using cognitive strategies and - strategies when they assess their students in listening classes. Moreover, the qualitative findings showed that the teachers encounter different challenges, such as, limited background knowledge about using listening assessment strategies in class, choosing appropriate listening texts, setting listening tasks, scoring listening tests, teachers’ limited experience about assessing listening skills, lack of teaching listening resources and lack of training sessions. Finally, a number of interesting implications and recommendations are provided in this study.
Houria Belhouari , Khadidja Ahmed Baich, Leila Kaddour Drizi
كلية العلوم التكنولوجية-جامعة عبد الحميد بن باديس مستغانم · الجزائر
Le complexe GL1/Z a pour objectif la liquéfaction du gaz naturel pour faciliter son transport tout en réduisant son volume d’environ 600 fois. Parmi les problèmes vécus au niveau des unités de liquéfaction du gaz naturel (GL1Z), nous avons les problèmes d’encrassement de l’échangeur E504, Ce dernier permet de régler la température finale de la MEA pauvre qui vient d’être régénérée à 38°C, celle-ci passe côté calandre tandis que l’eau de mer de caractère corrosif est envoyé côté tube. Notre travail consiste à l’étude comparative de d’échangeur de chaleur E504 de la section décarbonatation entre les paramètres de (design, 2019,2022). Les résultats d’analyse des dépôts des faisceaux tubulaires de l’échangeur E.504, donnés par le laboratoire du complexe GL1/Z montrent la présence d’une grande quantité de sels de calcium et magnésium, ces dépôts formés peuvent boucher les tubes qui induit une diminution du transfert de chaleur entre l’eau de mer et la solution de MEA pauvre d’où un échauffement local du métal, ayant pour conséquence une baisse des caractéristiques mécaniques de l’échangeur. Etles calculs que nous avons effectués à travers les données du complexe nous ont également confirmé qu'il existe unencrassement de l’échangeur E-504 dans l’année 2019.
Aymen Bebba, Bachir Dou, Saci Medileh
كلية العلوم الدقيقة-جامعة الشهيد حمة لخضر - الوادي · الجزائر
The critical nature of Electronic Health Records (EHR), and the technological advancement in the field of data privacy required researchers to come up with new strategies to handle EHRs in the healthcare industry. Many researchers have been investigating the possibility of integrating Blockchain technology to cloud-based EHR system architecture to increase the security of the health information within the system. However, EHR systems require more security to protect it for different attacks like Sybil Attacks and Linking Attacks. In this thesis, we propose a new data preservation mechanism called Anonymity Preservation Mechanism (APM), which provides another level of protection to health information of EHR systems by implementing a method of a multilayer cryptography to patient records. Moreover, this method splits patient records into two categories; identifiable information, and none identifiable information, implementing complicated hashing mechanism to the identifiable information which results a pseudo identities that do not link to the patient real identity, the none identifiable information go through an AES encryption method which uses a secret key to produce a secure ciphertext of the original data. Additionally, the generated outputs from the previous operations enter another phase of encryption by RSA cryptosystem, this multilayer encryption process produce a secure anonymized patient record. Furthermore, we integrated our proposed APM to our enhanced Blockchain-based EHR management system architecture. Lastly, we provided a prototype of our proposed APM and presented its implementation results in the system.
إبراهيم أبو شقير , شاهي هاني محمود شاهين, عثمان حامد
كلية الدراسات العليا-جامعة النجاح الوطنية · فلسطين
Background: Water pollution that comes from industrialization and rapid urbanization has been considered as serious problem because water is one of the vital resources for life, and it is important to all humans, environment, society and economy. Heavy metals (Ag, Hg, Pb, Cr, Cu…) are among the contaminants that are of primary concern and need to be removed from waste water by various technologies that include adsorption as the wide used treatment process. Low cost and effective adsorbents from natural polymers are of great interest for heavy metal removal from waste water and researches have been directed toward modifying these natural adsorbents to enhance their adsorption efficiency. Objectives: The main goal from this work is to prepare a crosslinked carboxymethyl-cellulose polymer functionalized with 2-aminopyridine in order to make it excellent binder to heavy metal for application in waste water purification. Methodology: The method of preparing the polymer begins with a reaction between carboxymethyl cellulose (CMC) polymer and 2-aminopyridine to convert the carboxylic group into amide then crosslinking the prepared polymer by diethylene triamine (DETA) for extra stability. The resulting polymer was analyzed by Fourier Transform -Infra Red (FT-IR), Atomic Force Microscopy (AFM) and Thermal Gravimetric Analysis (TGA).Results: The percent removal of Cu2+ ion by the prepared polymer was investigated under the following parameters: temperature, time, pH, adsorbent concentration and adsorbent dosage. The maximum removal of Cu2+ by CMC/2-aminopyridine polymer is 92.25% at pH = 7.23, temperature 19 ⁰C, time 20 min, adsorbent concentration 20 ppm and polymer dose 10 mg. The adsorption isotherm, kinetics and thermodynamics were investigated to determine the mechanism and spontaneity of the adsorption process and the results revealed that it is exothermic (ΔH° < 0), spontaneous (ΔG° < 0) and occurs spontaneously at low temperatures (ΔS° < 0). The adsorption follows Pseudo-second order model with (R2 = 0.99) and the Langmuir adsorption isotherm was applied with (R2 = 0.93)Conclusion: The target polymer was prepared and confirmed by IR, it is thermally stable based on TG analysis and it results in high percent removal of the heavy metal. Keywords: Carboxymethylcellulose, Water pollution, wastewater treatment, heavy metals, Copper, 2-aminopyridine, DETA
أسماء عبة, دليلة مزوز
كلية الاداب واللغات-جامعة محمد خيضر - بسكرة · الجزائر
حلا حمود, مجد صقور
الجامعة الافتراضية السورية · سوريا
