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

السعيد خلف , محمد غوالي

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة قاصدى مرباح ورقلة · الجزائر

الجمهورية الجزائرية الديمقراطية الشعبيةوزارة التعليم العالي والبحث العلميجامعة قاصدي مرباحكلية العلوم الاقتصادية وعلوم التسيير ورقلة

بدوي إلياس , غدايري إلهام

كلية العلوم الاقتصادية والتجارية وعلوم التسيير-جامعة قاصدى مرباح ورقلة · الجزائر

جامعة قاصدي مرباح – ورقلةكلية العلوم الاقتصادية والتجارية وعلوم التسييرقسم العلوم التجارية

Bouhalouane Amrani, Hamza Abbassa

كلية العلوم الدقيقة والاعلام الآلي-جامعة عبد الحميد بن باديس مستغانم · الجزائر

By mean of different numerical methods, many theoretical studies predict severalintermetallic Heusler compounds to be half metals at room temperature. This class ofmaterials is usually in base of spintronic applications or devices, where a relatively high Curietemperature is required in this field of applications, and 100% spin polarization at Fermi levelis desirable.This kind of compounds is classified in two categories: Half-Heusler and Full-Heusler,according to several crystallographic structures and magnetic orders.Among those compounds, a ferromagnetic class based on cobalt (Co) is promising, whichreceived an importance attention in several theoretical studies.In this work, we have used the ab initio method in order to explore structural, elastic,mechanic, electronic, magnetic and thermodynamic properties of compounds based on Co,Rh, Ru and NiMn(Sn,Sb) Half-Heusler.

Hsan Hadj Abdallah, Omar Kahouli, Rim Ben Salah

المدرسة الوطنية للمهندسين - صفاقس-جامعة صفاقس · تونس

ليلى عبود, هبه محمد سلهب, وائل على

كلية الهندسة الزراعية-جامعة تشرين · سوريا

اياد المفتي, رستم مكية

كلية الطب البشري-جامعة دمشق · سوريا