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Blockchain Mobile Wallet with Secure Offline Transactions

Computers, Materials & Continua 2023年第5期75卷 2905-2919页

作者： Raed Saeed Rasheed Khalil Hamdi Ateyeh Al-Shqeerat ahmed Salah Ghorab Fuad Salama AbuOwaimer aiman ahmed abusamra Faculty of Engineering Islamic University of GazaP.O.Box 108GazaPalestine Department of Computer Science College of ComputerQassim UniversityP.O.Box 52211BuraydahSaudi Arabia University College of Applied Sciences P.O.Box 1415GazaPalestine Palestine Technical College P.O.Box 6037Deir ElBalahPalestine

There has been an increase in the adoption of mobile payment systems worldwide in the past few ***,poor Internet connection in rural regions continues to be an obstacle to the widespread use of such *** top of that,there are significant problems with the currently available offline wallets;for instance,the payee cannot verify the number of coins received without access to the ***,it has been demonstrated that some existing systems are susceptible to false token generation,and some do not even permit the user to divide the offline token into smaller portions to be used as *** paper proposes a blockchainbased wallet system that provides a secure mobile payment service even if a user cannot access a reliable Internet *** approach relies on Bluetooth and digital signatures to establish and build a trust connection between the *** proposed solution overcomes the main limitations of existing systems that use offline transactions,such as the generation of fake offline tokens and the indivisibility of offline *** user buys Offline Tokens(OTs)from a server called an Offline Token Manager(OTM)to use them later to perform offline *** mobile device must store a single,signed offline token transaction to prevent fake *** the other hand,all offline transactions will be kept as a history in a particular local ***,when the receiver becomes online,it will send a convert request to the OTMto change the value of the OTs to the appropriate amount in real *** step requires a connection to the *** evaluate the effectiveness of the system,the Solidity programming language was used to develop a smart contract on the Ethereum blockchain with a backend application programming interface(API)and an android mobile *** proposed method has an advantage over other prominent wallets.

关键词： Mobile wallet blockchain smart contracts digital signature

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The Role of Agricultural Extension in Decentralizing the Sensitivity of Vegetable Farmers to the Risk of Residual Pesticide Effects

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Agricultural Sciences 2020年第8期11卷 722-729页

作者： aiman Hamad Eltyeb Elshifa Ali Mergani Omeima Bashir Khalid Tawheed Mohammed Elheesin Shareef Khalid ahmed Abbakar Department of Economic Agricultural and Rural Development Faculty of Agricultural and Environmental Sciences University of Gadarif Gadarif Sudan Department of Agricultural Extension and Rural Development College of Agricultural Studies Sudan University of Science and Technology Khartoum North Sudan Gansu Academy of Agricultural Sciences Lanzhou China Department of Agriculture Engineering Faculty of Agriculture University of Khartoum Khartoum Sudan Department of Mathematics and Physics Faculty of Education University of Gadarif Gadarif Sudan College of Mathematics and Statistics Northwest Normal University Lanzhou China

This study was carried out in the northern Khartoum (Bahry Locality) with the aim of knowing the role of agricultural extension in developing the awareness of the farmer to the danger of residual effect of pesticides (vegetable farmers). The social survey method was used to conduct this study;100 vegetable farmers were selected randomly. The data collected through questionnaires, observation, and interviews for primary data, previously concerned, and reference documents were used to collect secondary data. Data collected were analyzed using the statistical packages for social science (SPSS). The study yielded some useful results, the most important of which are: the presence of respondents who obtain their information about pesticides from merchants, the absence of a guide provider in their area, and the absence of any seminars or lectures on the use of pesticides, or programs. For example, radio and television programs were presented but protective clothing was not used. This study is based on the researcher's advocate for the following: intensifying agricultural extension and employee visits to the agricultural field, in addition to intensifying educational evidence for consumers regarding pesticides and providing preliminary data on pesticides and how to deal with them and increase them. Educate farmers about the safe use of pesticides and identify the risks and damages that pesticides cause to humans.

关键词： Agricultural Sector Pesticides Vegetables Awareness

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Impact of COVID-19 on endourology surgical practice in Saudi Arabia:A national multicenter study

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Asian Journal of Urology 2021年第4期8卷 416-423页

作者： Abdel Raheem Ali Yahya Ghazwani Ibrahim Alowidah Raed A.Azhar Mohammed Alomar ahmed Alzahrani Ossamah Alsowayan Wissam Kamal Abdulrahman Alalayet Ahmad Bugis Abdulaziz MAlthunayan MAlzahrani Tarek Kamel Fadaak aiman Al-Solumany Saeed Bin Hamri Urology Department King Saud Medical CityRiyadhSaudi Arabia Urology Department Faculty of MedicineTanta UniversityTantaEgypt Devision of Urology King Abdullah International Medical Research CenterCollege of MedicineKing Abdulaziz Medical CityKing Saud Bin Abdulaziz University for Health ScienceDivision of UrologyKing Abdulaziz Medical CityRiyadhSaudi Arabia Urology Department Faculty of MedicineKing Abdulaziz UniversityJeddahSaudi Arabia Department of Surgery College of MedicineKing Saud University and King Saud University Medical CityRiyadhSaudi Arabia Urology Department Price Sultan Military Medical CityRiyadhSaudi Arabia Urology Department King Fahd HospitalImam Abdulrahman Bin Faisal UniversityDammamSaudi Arabia Urology Department King Fahd HospitalJeddahSaudi Arabia

Objective:To identify the impact of COVID-19 on endourology surgical practice in Saudi ***:A retrospective study of seven tertiary hospitals from January 2019 to April 2019,and from January 2020 to April 2020 was *** of urology outpatient department(OPD)visits and endourology procedures in the first third of 2020 were analyzed and compared with those in the first third of 2019,as well as,during the full curfew time,*** 2020 versus April ***:Number of OPD visits in the first third of 2020 and 2019 were 19499 and 26594,respectively(p75%,including OPD visits and elective endourology *** hospitals have changed their strategic preventive measures by increasing the rate of teleclinics and day surgeries.

关键词： COVID-19 Endourology Saudi Arabia

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Formulation and Evaluation of Yemeni Potash Alum as Hydrophilic Topical Preparations against Candidiasis and Aspergillosis

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Clinical Complementary Medicine and Pharmacology 2022年第4期2卷 26-38页

作者： Moath Refat Anes A.M.Thabit Abdul-Rahman Maqboli Hesham Siddick Rafaʼa MAl-Ghozee Abdul-baqi A.Thabet Manar Refat aiman Saleh A.Mohammed ahmed Al-Sabati Wu Xin’an College of Pharmaceutical Science Lanzhou UniversityLanzhou 730000GansuChina Department of Pharmacy The First Hospital of Lanzhou UniversityLanzhou 730000GansuChina College of Pharmacy University of Science and TechnologyAl-Hodeidah15201Yemen College of Medical Sciences University of Science and TechnologyAl-Hodeidah15201Yemen College of Pharmacy Sana’a UniversitySana’a1247Yemen Pharmacy department Al-Razi UniversitySana’aYemen Department of Pharmacology Faculty of PharmacyUniversity of AdenAden6312Yemen

Background:Skin and soft tissue infections are *** and Aspergillosis are the most common cutaneous fungal *** alum(Aluminium Potassium Sulphate)is a natural mineral with antifungal and antibacterial ***:This study aimed to confirm Yemeni alum’s antifungal effectiveness against selected fungal strains and develop useful topical ***:Using different alum concentrations,we prepared twenty-three formulations,including four non-adjusted aqueous solutions,eight adjusted pH aqueous solutions,eight glycerite solutions,and three Oil/Water cream ***,we examined the antifungal activity against the suggested *** animal skin irritation test evaluated the local skin sensitivity reactions that might happen upon using the formulations we pre-pared on the intact animal’s ***,this study also included six weeks of stability testing to estimate the expected shelf life(t90)of the selected ***:Alum exerted antifungal effect against Candida albicans,Aspergillus niger,and Aspergillus *** animal’s skin was not irritated by any of the formulations *** 5%alum aqueous solution and the 10%alum Oil/Water cream exhibited promising results among all tested *** approximate formulation’s shelf-lives(t90)were 2 and 1.52 years with alum content(%)ranging between 105.75%to 106.02%,***:Based on the results we found,10%alum Oil/Water cream is a promising formulation for large-scale manufacture.

关键词： Potassium alum Yemeni alum Antifungal Topical preparations Skin soft tissue infections Candidiasis Aspergillosis

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