Blockchain-based student certificate management and system sharing using hyperledger fabric platform

One of the major capabilities of blockchain technology is the sharing of data in verifiable ways without losing control of information possession. Issuing and verifying student certifications for higher study applications or job recruitment require many steps that take days to complete and are considered time-consuming. Most universities around the world use centralized systems to control the entire procedure when a graduate applies for a job or postgraduate studies. Applying blockchain technology to certificate verification protocols through a comprehensive architecture provides authenticity and reduces time significantly. In this paper, a framework has been proposed to issue student certifications locally in addition to sharing them across the internet while maintaining control and ownership of the certifications. This framework leverages the advantages of blockchain technology to electronic certification sharing and verification. Applying the proposed blockchain-based certification system in universities will provide low latency for issuing, sharing, and verification of these certifications. The paper presents the proposed blockchain-based framework for e-certification sharing and an evaluation of the framework, which consists of measuring the average time to issue a certificate and transaction latency time.</p

A review on copy-move image forgery detection techniques

With billions of digital images flooding the internet which are widely used and regards as the major information source in many fields in recent years. With the high advance of technology, it may seem easy to fraud the image. In digital images, copy-move forgery is the most common image tampering, where some object(s) or region(s) duplicate in the digital image. The important research has attracted more attention in digital forensic is forgery detection and localization. Many techniques have been proposed and many papers have been published to detect image forgery. This paper introduced a review of research papers on copy-move image forgery published in reputed journals from 2017 to 2020 and focused on discussing various strategies related with fraud images to highlight on the latest tools used in the detection. This article will help the researchers to understand the current algorithms and techniques in this field and ultimately develop new and more efficient algorithms of detection copy-move image

Prevalence, Isolation and Identification of Microorganisms from Homemade Cheese in Babylon Province

تم جمع أربعون عينة من جبن العرب (الجبن المصنع محليا") من السوق المحلي في محافظة بابل لدراسة التلوث الجرثومي (النمو البكتيري والفطري). كشفت الدراسة اولا" عن وجود عينات سالبة لكل وسط زرعي استخدم للكشف عن&nbsp; البكتيريا، حيث وجد في وسط MSA كان هناك 27 عينة موجبة و 13 عينة&nbsp; سالبة, على وسط EMB ظهرت 24 عينة موجبة و 16 عينة سالبة، وعلى الوسط MRS ظهرت 32 عينة موجبة و 8 عينات سالبة أخيرا" وسط&nbsp; S-S أكار ظهرت 31 عينة موجبة و 9 عينات سالبة. تم عزل 17 سلالة من Staphylococcus aureus على وسط MSA, و 10 سلالات من Staphylococcus epidermidis. وعلى الوسط EMB تم عزل 12 سلالة من Escherichia coli و 18 سلالة من Klebsiella. وسط MRS&nbsp; سجل 32 سلالة من Lactobacillus واخيرا وسط S-S agar سجل 10 سلالات من Salmonella و 29 سلالة من Shigella . اما الفطريات التي تم عزلها على وسط PDA فقد كانت : Penicillium digitatum (74.7 %), Penicillium italicum (13.2 %), Penicillium citrinum (6.02 %), Penisillium chrysogenum ( 2.40 % ), Aspergellus nedulans (3.7 % ), Alternaria (0 %)&nbsp; وعدد كبير من مستعمرات ال Candida وRhodotorella&nbsp; . وعلى وسط MEA تم عزل الفطريات الاتية وكالاتي :Penicillium digitatum( 80%), Penicillium italecum (3.1 %), Penicillium citrinm (0%), Penicillium chrysogenum ( 6.2%), Aspergillus nidulans (7.69%), Alternaria ( 3.1) وكذلك عدد كبير من مستعمرات الCandida&nbsp; و&nbsp; Rhodotorella كما في وسط PDA&nbsp; . &nbsp;Forty samples of Gibin al Arab cheese were collected from local market at Babylon province for studying the microbial contamination ( bacterial and fungal growth ). first the study revealed that there was negative samples for each culture media used for bacterial detection, in MSA there was 27+ve samples and 13-ve samples, EMB with 24+ve samples and 16-ve samples, MRS with 32+ve samples and 8-ve samples finally S-S agar with 31+ve samples and 9 –ve samples. MSA record 17 strain of Staphylococcus aureus, 10 strain of Staphylococcus epidermidis, EMB record 12 strain of Escherichia coli, 18 strain of Klebsiella, MRS record 32 strain of Lactobacillus, S-S agar record 10 strain of Salmonella, 29 strain of Shigella. while fungi isolated on PDA was : Penicillium digitatum (74.7%), Penicillium italicum (13.2%), Penicillium citrinum (6.02 %), Penisillium chrysogenum (2.40%), Aspergellus nedulans (3.7 %), Alternaria (0%), Candida spp. with more isolates, also Rhodotorella more. MEA media used for fungi isolation record : Penicillium digitatum(80%), Penicillium italecum (3.1%), Penicillium citrinm (0%), Penicillium chrysogenum (6.2%), Aspergillus nidulans (7.69%), Alternaria ( 3.1% ), Candida spp. with more isolates, Rhodotorella more like on PDA

Computational analysis of the influence of PCMs on building performance in summer

The insulation of buildings in summer requires to exploit the heat capacity of materials in order to delay the heat transfer through the building structure. Phase change materials (PCM) installed in buildings can reduce the indoor temperature; however, given their high cost, their use must be evaluated carefully. This paper investigates the structures that can be coupled with PCM efficaciously, and it highlights some problems that could be caused by PCMs. The investigation has been performed numerically by means of the Energy-Plus software