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Ab-initio investigation of AGeO_3(A=Ca, Sr) compounds via Tran Blaha-modified Becke Johnson exchange potential

Chinese Physics B 2017年第11期26卷 375-382页

作者： Rasul Bakhsh Behram M A Iqbal Muhammad Rashid M atif Sattar Asif Mahmood Shahid M Ramay Physics Department University of the Punjab Quaid-e-Azam Campus Allama Iqbal Open University Regional Campus Department of Physics School of Science University of Management and Technology Department of Physics COMSATS Institute of Information Technology Department of Physics Simulation Lab The Islamia University of Bahawalpur Chemical Engineering Department College of Engineering King Saud University Physics and Astronomy Department College of Science King Saud University

We employ ab-initio calculations to analyze the mechanical, electronic, optical and also thermoelectric properties associated with AGeO3（A = Ca, Sr） compounds. The full-potential linearized augmented plane wave（FP-LAPW） technique in the generalized gradient approximation（GGA-PBEsol） and the lately designed Tran-Blaha-modified Becke-Johnson exchange potential are utilized to examine the mechanical and optoelectronic properties respectively. To explore the thermoelectric quality, we use the semi-classical Boltzmann transport theory. The particular structural stabilities regarding AGeO3（A = Ca, Sr） materials are validated simply by computations from the elastic constants. The energy band structural framework and the density of states are displayed to indicate indirect bandgap under ambient conditions. The particular computed optical attributes that reveal prospective optoelectronic applications are usually elucidated simply by studying ε1（0） and also Eg, which can be connected by means of Penn＇s design. The optical details uncover the actual suitability to power ranging products. Finally, the Boltz Tra P code is executed to analyze the actual thermoelectric properties, which usually presents that the increase of internal temperatures can enhance the electric conductivity, thermal conductivity and also the power factor, whilst Seebeck coefficient decreases. Therefore, the studied materials will also be ideal for thermoelectric products to understand helpful option for alternative energy resources.

关键词： semiconductors elastic properties optical properties thermal properties

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First-principles prediction of magnetically ordered half-metals above room temperature

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Journal of Materiomics 2019年第3期5卷 404-412页

作者： Muhammad atif Sattar S.Aftab Ahmad Fayyaz Hussain Claudio Cazorla Department of Physics The Islamia University of Bahawalpur63100BahawalpurPakistan School of Materials Science and Engineering UNSW SydneyNSW2052Australia Department of Physics Bahauddin Zakariya University60800MultanPakistan

Half-metallicity(HM)offers great potential for engineering spintronic applications,yet only few magnetic materials present metallicity in just one spin *** addition,most HM systems become magnetically disordered at temperatures well below ambient conditions,which further hinders the development of spin-based electronic ***,we use first-principles methods based on density functional theory(DFT)to investigate the electronic,magnetic,structural,mixing,and vibrational properties of 90 XYZ half-Heusler(HH)alloys(X=Li,Na,K,Rb,Cs;Y=V,Nb,Ta;Z=Si,Ge,Sn,S,Se,Te).We disclose a total of 28 new HH compounds that are ferromagnetic,vibrationally stable,and HM,with semiconductor band gaps in the range of 1-4 eV and HM band gaps of 0.2-0.8 *** performing Monte Carlo simulations of a spin Heisenberg model fitted to DFT energies,we estimate the Curie temperature,T_(C),of each HM *** find that 17 HH HM remain magnetically ordered at and above room temperature,namely,300≤T_(C)≤450 K,with total magnetic moments of 2 and 4 mB.A further materials sieve based on zero-temperature mixing energies let us to conclude 5 overall promising HH HM that remain magnetically ordered at and above room temperature:NaVSi,RbVTe,CsVS,CsVSe,and *** also predict 2 semiconductor materials that are ferromagnetic at ambient conditions:LiVSi and LiVGe.

关键词： magnetic ordered mixing

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Reactive oxygen species and chemokines: Are they elevated in the esophageal mucosa of children with gastroesophageal reflux disease?

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World Journal of Gastroenterology 2008年第20期14卷 3218-3223页

作者： Engin Tutar Deniz Ertem Goksenin Unluguzel sevda Tanrikulu Goncagul Haklar Cigdem Celikel Evin Ademoglu Ender Pehlivanoglu Division of Pediatric Gastroenterology Hepatology and Nutrition Marmara University School of Medicine Altunizade stanbul 81190 Turkey Department of Biochemistry Marmara University School of Medicine Altunizade stanbul 81190 Turkey Department of Biochemistry Istanbul University Istanbul Faculty of Medicine apa stanbul 34390 Turkey Department of Pathology Marmara University School of Medicine Altunizade stanbul 81190 Turkey

AIM: To determine the role of inflammatory cytokines and reactive oxygen species (ROS) in childhood reflux esophagitis. METHODS: A total of 59 subjects who had complaints suggesting GERD underwent esophagogastroduoden oscopy. Endoscopic and histopathologic diagnosis of reflux esophagitis was established by Savary-Miller and Vandenplas grading systems, respectively. Esophageal biopsy specimens were taken from the esophagus 20% proximal above the esophagogastric junction for conventional histopathological examination and the measurements of ROS and cytokine levels. ROS were measured by chemiluminescence, whereas IL-8 and MCP-1 levels were determined with quantitative immunometric ELISA on esophageal tissue. Esophagealtissue ROS, IL-8 and MCP-1 levels were compared among groups with and without endoscopic/histo- pathologic esophagitis. RESULTS: Of 59 patients 28 (47.5%) had normal esophagus whereas 31 (52.5%) had endoscopic esophagitis. In histopathological evaluation, almost 73% of the cases had mild and 6.8% had moderate degree of esophagitis. When ROS and chemokine levels were compared among groups with and without endoscopic esophagitis, statistical difference could not be found between patients with and without esophagitis. Although the levels of ROS, IL-8 and MCP-1 were found to be higher in the group with histopathological reflux esophagitis, this difference was not statistically significant. CONCLUSION: These results suggest that the grade of esophagitis is usually mild or moderate during childhood and factors apart from ROS, IL-8 and MCP-1 may be involved in the pathogenesis of reflux esophagitis in children.

关键词： Gastroesophageal reflux disease Refluxesophagitis Reactive oxygen species Interleukine-8 Monocyte chemoattractant protein-1

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Study of Bacterial Samples Using Laser Induced Breakdown Spectroscopy

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Plasma Science and Technology 2014年第12期16卷 1141-1146页

作者： W A FAROOQ M atif W TAWFIK M S ALSALHI Z A ALAHMED M SARFRAZ J P SINGH Physics and Astronomy Department College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia National Institute of Laser and Optronics NiloreIslamabadPakistan National Institute of Laser Enhanced Sciences NILES Department of Environmental ApplicationsCairo UniversityCairoEgypt Sustainable Energy Technologies Centre King Saud UniversityRiyadhSaudi Arabia Institute for Clean Energy Technology Mississippi State UniversityStarkvilleMS 39759USA

Laser-induced breakdown spectroscopy （LIBS） technique has been applied to inves- tigate two different types of bacteria, Escherichia coli （B1） and Micrococcus luteus （B2） deposited on glass slides using Spectrolaser 7000. LIBS spectra were analyzed using spectrolaser software. LIBS spectrum of glass substrate was compared with bacteria spectra. Ca, Mg, Na, K, P, S, C1, Fe, A1, Mn, Cu, C, H and CN-band appeared in bacterial samples in air. Two carbon lines at 193.02 nm, 247.88 nm and one hydrogen line at 656.28 nm with intensity ratios of 1.9, 1.83 and 1.53 appeared in bacterial samples B1 and B2 respectively. Carbon and hydrogen are the important components of the bio-samples like bacteria and other cancer cells. Investigation on LIBS spectra of the samples in He and Ar atmospheres is also presented. Ni lines appeared only in B2 sample in Ar atmosphere. From the present experimental results we are able to show that LIBS technique has a potential in the identification and discrimination of different types of bacteria.

关键词： laser induced breakdown bacteria bio-samples and carbon lines

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DL-HAR: Deep Learning-Based Human Activity Recognition Framework for Edge Computing

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Computers, Materials & Continua 2020年第11期65卷 1033-1057页

作者： Abdu Gumaei Mabrook Al-Rakhami Hussain AlSalman Sk.Md.Mizanur Rahman atif Alamri Research Chair of Pervasive and Mobile Computing King Saud UniversityRiyadh11543Saudi Arabia College of Computer and Information Sciences King Saud UniversityRiyadh11543Saudi Arabia Information and Communication Engineering Technology School of Engineering Technology and Applied ScienceCentennial CollegeTorontoCanada

Human activity recognition is commonly used in several Internet of Things applications to recognize different contexts and respond to *** learning has gained momentum for identifying activities through sensors,smartphones or even surveillance ***,it is often difficult to train deep learning models on constrained IoT *** focus of this paper is to propose an alternative model by constructing a Deep Learning-based Human Activity Recognition framework for edge computing,which we call *** goal of this framework is to exploit the capabilities of cloud computing to train a deep learning model and deploy it on less-powerful edge devices for *** idea is to conduct the training of the model in the Cloud and distribute it to the edge *** demonstrate how the DL-HAR can perform human activity recognition at the edge while improving efficiency and *** order to evaluate the proposed framework,we conducted a comprehensive set of experiments to validate the applicability of *** results on the benchmark dataset show a significant increase in performance compared with the state-of-the-art models.

关键词： Human activity recognition edge computing deep neural network recurrent neural network Docker

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A numerical study to assess the effect of heterogeneity on CO_(2) storage potential of saline aquifers

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能源地球科学(英文) 2020年第1期1卷 20-27页

作者： Zain Rasheed Arshad Raza Raoof Gholami Minou Rabiei atif Ismail Vamegh Rasouli Petroleum and Mining Engineering Department of EnvironmentLand and Infrastructure EngineeringPolitecnico di TorinoItaly Department of Petroleum&Gas Engineering University of Engineering and Technology(UET)LahorePakistan Department of Petroleum Engineering Curtin UniversityMalaysia Department of Petroleum Engineering University of North DakotaUSA Department of Geological Engineering University of Engineering and Technology(UET)LahorePakistan

Many parameters have been indicated crucial for the selection of a saline aquifer as a carbon dioxide(CO_(2))storage ***,less attention has been given to the impact of heterogeneity on the performance of these storage ***,the heterogeneity effect was evaluated in this paper by adopting a numerical modeling approach and the existing screening criterion developed for the aquifers was *** updated criterion for CO_(2)storage purpose would enhance the confidence level during the selection of deep saline aquifer and thus,help to address the climate change *** numerical modeling was carried out via CO_(2)STORE module of Eclipse300 Simulator to evaluate the effect of different levels of heterogeneity on CO_(2)storage *** degrees of heterogeneity from homogenous systems to highly heterogeneous systems in the model were incorporated through the Lorenz *** this way,simulation of nine cases was carried out for three different aquifers with different porosity values.A comparison of these results showed that heterogeneity causes the aquifer to have lower storage *** the trapping potential,dissolution trapping was significant and the amount of free gas in all cases was *** addition,the aquifer with the highest level of heterogeneity(HLH)had a minimum fraction of residual trapping regardless of *** was also found that final pressure at the end of 30 years is the same and high for low-level heterogeneity(LLH)and medium level heterogeneity(MLH)cases and low for HLH,while the injection rate stability duration is least for HLH and maximum for *** on the results obtained,it can be concluded that low to medium level heterogeneous aquifers with a good porosity can be a suitable choice for CO_(2)storage.

关键词： Aquifer CO_(2)storage Heterogeneity Numerical modeling Performance

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A Secure Method for Data Storage and Transmission in Sustainable Cloud Computing

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Computers, Materials & Continua 2023年第5期75卷 2741-2757页

作者： Muhammad Usman Sana Zhanli Li Tayybah Kiren Hannan Bin Liaqat Shahid Naseem atif Saeed College of Computer Science and Technology Xi’an University of Science and TechnologyXi’anShaanxi710054China Department of Computer Science(RCET Campus) University of Engineering and TechnologyLahore39161Pakistan Department of Information Sciences Division of Science&TechnologyUniversity of EducationLahore54700Pakistan Department of Computer Science COMSATS UniversityIslamabadLahore54700Pakistan

Cloud computing is a technology that provides secure storage space for the customer’s massive data and gives them the facility to retrieve and transmit their data efficiently through a secure network in which encryption and decryption algorithms are being *** cloud computation,data processing,storage,and transmission can be done through laptops andmobile *** Storing in cloud facilities is expanding each day and data is the most significant asset of *** important concern with the transmission of information to the cloud is security because there is no perceivability of the client’s *** have to be dependent on cloud service providers for assurance of the platform’s *** security and privacy issues reduce the progression of cloud computing and add ***;most of the data that is stored on cloud servers is in the form of images and photographs,which is a very confidential form of data that requires secured *** this research work,a public key cryptosystem is being implemented to store,retrieve and transmit information in cloud computation through a modified Rivest-Shamir-Adleman(RSA)algorithm for the encryption and decryption of *** implementation of a modified RSA algorithm results guaranteed the security of data in the cloud *** enhance the user data security level,a neural network is used for user authentication and ***;the proposed technique develops the performance of detection as a loss function of the bounding *** Faster Region-Based Convolutional Neural Network(Faster R-CNN)gets trained on images to identify authorized users with an accuracy of 99.9%on training.

关键词： Cloud computing data security RSA algorithm Faster R-CNN

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Fog-Based Secure Framework for Personal Health Records Systems

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Computers, Materials & Continua 2021年第2期66卷 1937-1948页

作者： Lewis Nkenyereye S.M.Riazul Islam Mahmud Hossain MAbdullah-Al-Wadud atif Alamri Department of Computer&Information Security Sejong UniversitySeoul05006Korea Department of Computer Science and Engineering Sejong UniversitySeoul05006Korea Department of Computer Science University of Alabama at BirminghamBirminghamAL35294USA Department of Software Engineering King Saud UniversityRiyadh11543Saudi Arabia

The rapid development of personal health records(PHR)systems enables an individual to collect,create,store and share his PHR to authorized *** care systems within the smart city environment require a patient to share his PRH data with a multitude of institutions’repositories located in the *** cloud computing paradigm cannot meet such a massive transformative healthcare systems due to drawbacks including network latency,scalability and *** computing relieves the load of conventional cloud computing by availing intermediate fog nodes between the end users and the remote *** a massive demand of PHR data within a ubiquitous smart city,we propose a secure and fog assisted framework for PHR systems to address security,access control and privacy *** under a fog-based architecture,the proposed framework makes use of efficient key exchange protocol coupled with ciphertext attribute based encryption(CP-ABE)to guarantee confidentiality and fine-grained access control within the system *** also make use of digital signature combined with CP-ABE to ensure the system authentication and users *** provide the analysis of the proposed framework in terms of security and performance.

关键词： Fog computing personal health records ciphertext attribute based encryption secure communications

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Enhanced Reversible Zinc Ion Intercalation in Deficient Ammonium Vanadate for High-Performance Aqueous Zinc-Ion Battery

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Nano-Micro Letters 2021年第8期13卷 13-27页

作者： Quan Zong Wei Du Chaofeng Liu Hui Yang Qilong Zhang Zheng Zhou Muhammad atif Mohamad Alsalhi Guozhong Cao Department of Materials Science and Engineering University of WashingtonSeattleWA 98195USA School of Materials Science and Engineering State Key Lab Silicon MatZhejiang UniversityHangzhou 310027People’s Republic of China Research Chair On Laser Diagnosis of Cancers Department of Physics and AstronomyCollege of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Physics and Astronomy College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

Ammonium vanadate with bronze structure(NH_(4)V_(4)O_(10))is a promising cathode material for zinc-ion batteries due to its high specific capacity and low ***,the extraction of NH^(+)_(4) at a high voltage during charge/discharge processes leads to irreversible reaction and structure *** this work,partial NH^(+)_(4) ions were pre-removed from NH_(4)V_(4)O_(10) through heat treatment;NH_(4)V_(4)O_(10) nanosheets were directly grown on carbon cloth through hydrothermal ***-cient NH_(4)V_(4)O_(10)(denoted as NVO),with enlarged interlayer spacing,facilitated fast zinc ions transport and high storage capacity and ensured the highly reversible electrochemical reaction and the good stability of layered *** NVO nanosheets delivered a high specific capac-ity of 457 mAh g^(−1) at a current density of 100 mA g^(−1) and a capacity retention of 81%over 1000 cycles at 2 A g^(−1).The initial Coulombic efficiency of NVO could reach up to 97%compared to 85%of NH_(4)V_(4)O_(10) and maintain almost 100%during cycling,indicating the high reaction reversibility in NVO electrode.

关键词： Deficient ammonium vanadate Large interlayer spacing Reversible redox reaction Electrochemical mechanism

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Offshore Software Maintenance Outsourcing Process Model Validation:A Case Study Approach

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Computers, Materials & Continua 2023年第3期74卷 5035-5048页

作者： atif Ikram Masita Abdul Jalil Amir Bin Ngah Adel Sulaiman Muhammad Akram Ahmad Salman Khan Faculty of Ocean Engineering Technology and Informatics University Malaysia TerengganuKuala TerengganuMalaysia Department of Computer Science&Information Technology Faculty of Information TechnologyThe University of LahoreLahore54000Pakistan Department of Computer Science College of Computer Science and Information SystemsNajran UniversityNajranSaudi Arabia Department of Software Engineering Faculty of Information TechnologyThe University of LahoreLahore54000Pakistan

The successful execution and management of Offshore Software Maintenance Outsourcing(OSMO)can be very beneficial for OSMO vendors and the OSMO *** a lot of research on software outsourcing is going on,most of the existing literature on offshore outsourcing deals with the outsourcing of software development *** frameworks have been developed focusing on guiding software systemmanagers concerning offshore software ***,none of these studies delivered comprehensive guidelines for managing the whole process of *** is a considerable lack of research working on managing OSMO from a vendor’s ***,to find the best practices for managing an OSMO process,it is necessary to further investigate such complex and multifaceted phenomena from the vendor’s *** study validated the preliminary OSMO process model via a case study research *** results showed that the OSMO process model is applicable in an industrial setting with few *** industrial data collected during the case study enabled this paper to extend the preliminary OSMO process *** refined version of the OSMO processmodel has four major phases including(i)Project Assessment,(ii)SLA(iii)Execution,and(iv)Risk.

关键词： Offshore outsourcing process model model validation vendor challenges case study

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