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Earthquake Engineering and Engineering Vibration 2016年第1期15卷 49-60页

作者： talal awwad Modar Donia Department of Earthquake Geotechnical Engineering Higher Institute for Earthquake Researches and Studies (HIERS) Damascus University Syria Ministry of water resources Syria

2D finite element models were developed to analyze the effect of improved soft-soil foundation on the efficiency of a base-isolated concrete frame. Static and dynamic analyses were performed for a frame on raft foundation. Non-improved and improved soft-soil foundation using rigid inclusions were considered, as well as the use of high damping rubber bearing as base isolation. Results show that the use of rigid inclusions increases the efficiency of base isolation; base shear is reduced by 38% and maximum acceleration at the top of the frame by 30%.

关键词： rigid inclusion dynamic soil response foundation finite element method

CL2ES-KDBC:A Novel Covariance Embedded Selection Based on Kernel Distributed Bayes Classifier for Detection of Cyber-Attacks in IoT Systems

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Computers, Materials & Continua 2024年第3期78卷 3511-3528页

作者： talal Albalawi P.Ganeshkumar Computer Science Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia

The Internet of Things(IoT)is a growing technology that allows the sharing of data with other devices across wireless ***,IoT systems are vulnerable to cyberattacks due to its opennes The proposed work intends to implement a new security framework for detecting the most specific and harmful intrusions in IoT *** this framework,a Covariance Linear Learning Embedding Selection(CL2ES)methodology is used at first to extract the features highly associated with the IoT ***,the Kernel Distributed Bayes Classifier(KDBC)is created to forecast attacks based on the probability distribution value *** addition,a unique Mongolian Gazellas Optimization(MGO)algorithm is used to optimize the weight value for the learning of the *** effectiveness of the proposed CL2ES-KDBC framework has been assessed using several IoT cyber-attack datasets,The obtained results are then compared with current classification methods regarding accuracy(97%),precision(96.5%),and other *** analysis of the CL2ES-KDBC system on IoT intrusion datasets is performed,which provides valuable insight into its performance,efficiency,and suitability for securing IoT networks.

关键词： IoT security attack detection covariance linear learning embedding selection kernel distributed bayes classifier mongolian gazellas optimization

High temperature deformation and recrystallization behavior of magnesium bicrystals with 90°<1010>and 90°<1120>tilt grain boundaries

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Journal of Magnesium and Alloys 2024年第2期12卷 625-638页

作者： Kevin Bissa talal Al-Samman Dmitri A.Molodov Institute of Physical Metallurgy and Materials Physics RWTH Aachen University52056 AachenGermany International Research Organization for Advanced Science and Technology(IROAST) Kumamoto UniversityKumamoto 860-8555Japan

The deformation mechanisms and dynamic recrystallization(DRX)behavior of specifically grown bicrystals with a symmetric 90°and 90°tilt grain boundary,respectively,were investigated under deformation in plane strain compression at 200℃and 400℃.The microstructures were analyzed by panoramic optical microscopy and large-area electron backscatter diffraction(EBSD)orientation *** analysis employed a meticulous approach utilizing hundreds of individual,small EBSD maps with a small step size that were stitched together to provide comprehensive access to orientation and misorientation data on a macroscopic *** slip primarily governed the early stages of deformation at the two temperatures,and the resulting shear induced lattice rotation around the transverse direction(TD)of the *** existence of the grain boundary gave rise to dislocation pile-up in its vicinity,leading to much larger TD-lattice rotations within the boundary region compared to the *** increasing temperature,the deformation was generally more uniform towards the bulk due to enhanced dislocation mobility and more uniform stress *** recrystallization at 200℃was initiated in{1011}-compression twins at strains of 40%and *** 400℃,DRX consumed the entire grain boundary region and gradually replaced the deformed microstructure with progressing *** recrystallized grains displayed characteristic orientations,such that their c-axes were perpendicular to the TD and additionally scattered between 0°and 60°from the loading *** recrystallized grains displayed mutual rotations of up to 30°around the c-axes of the initial grains,forming a discernible basal fiber texture component,prominently visible in the{1120}pole *** is noteworthy that the deformation and DRX behaviors of the two analyzed bicrystals exhibited marginal variations in response to strain and deformation temperature.

关键词： Elevated deformation temperatures Plain strain compression Magnesium bicrystals Panorama EBSD Dynamic Recrystallization

MPDP: A Probabilistic Architecture for Microservice Performance Diagnosis and Prediction

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Computer Systems Science & Engineering 2024年第5期48卷 1273-1299页

作者： talal H.Noor Department of Computer Science College of Computer Science and EngineeringTaibah UniversityMadinah42353Saudi Arabia

In recent years,container-based cloud virtualization solutions have emerged to mitigate the performance gap between non-virtualized and virtualized physical ***,there is a noticeable absence of techniques for predicting microservice performance in current research,which impacts cloud service users’ability to determine when to provision or de-provision *** microservice performance poses challenges due to overheads associated with actions such as variations in processing time caused by resource contention,which potentially leads to user *** this paper,we propose,develop,and validate a probabilistic architecture named Microservice Performance Diagnosis and Prediction(MPDP).MPDP considers various factors such as response time,throughput,CPU usage,and othermetrics to dynamicallymodel interactions betweenmicroservice performance indicators for diagnosis and *** experimental data fromourmonitoring tool,stakeholders can build various networks for probabilistic analysis ofmicroservice performance diagnosis and prediction and estimate the best microservice resource combination for a given Quality of Service(QoS)*** generated a dataset of microservices with 2726 records across four benchmarks including CPU,memory,response time,and throughput to demonstrate the efficacy of the proposed MPDP *** validate MPDP and demonstrate its capability to predict microservice *** compared various Bayesian networks such as the Noisy-OR Network(NOR),Naive Bayes Network(NBN),and Complex Bayesian Network(CBN),achieving an overall accuracy rate of 89.98%when using CBN.

关键词： Cloud computing microservices monitoring performance QoS diagnosis prediction Bayesian network

Corrosion and Scaling Threat in Upstream Oil Operation

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World Journal of Engineering and Technology 2024年第2期12卷 426-437页

作者： Nasir Ullattumpoyil talal M. Al-Ghamdi Nasser R. Al-Hajri Southern Area Technical Support Department Saudi Aramco Dhahran KSA

Corrosiveness or scaling is an inherent threat to oil operations. The primary cause for this threat is the presence of water having complex geochemical matrix. Unanticipated water production, particularly if it contains unwanted impurities, can significantly impact hydrocarbon production. The current paper discusses the degree of threat posed to oil operation facilities based on the water characteristics. Methodology involved the collection and analysis of water samples from major sources in oil industry such as groundwater, wellheads and seawater. The parameters tested include geochemical, microbiological and pollutants. The lab data was used to develop scaling and corrosion prediction indices such as Langelier Saturation Index (LSI), Ryznar Stability Index (RSI) and Puckorius Scaling Index (PSI). The study indicated varying water chemistry for different sources. Mixing of those waters may lead to ionic saturation and scaling in different facilities. Presence of the SRB and GAB in some water sources also posed threat to water system by forming fouling and corrosion. Seawater used for offshore oilfields water injection to maintain reservoir pressure and improve oil recovery showed scaling tendency, whereas under different reservoir pressure, it can cause corrosion. Some of the samples also had corrosion residuals such as iron, which indicated active corrosion. Current study showed higher alkalinity with high sulfate for one groundwater sample with presence of active corrosion residuals such as dissolved iron and manganese. The study showed positive value for LSI which indicated supersaturation of the water samples with respect to calcium carbonate (CaCO3) and scale forming. Similarly, for RSI and PSI, the value was below six which confirmed the scaling potential for all the samples. Even though the index value was pointing towards scaling potential, the geochemistry, microbiology and presence of other impurities indicated corrosion threat to the oil and g

关键词： Formation Water Petroleum Reservoirs Groundwater Saturation Indices Corrosiveness

Radiographic Equipment and Accessories as a Potential Source of Nosocomial Infection

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Open Journal of Radiology 2024年第3期14卷 147-155页

作者： Lina Fahmi Hammad Essam Hussain Mattar Hanadi talal Ahmedah Mohamed Zain Shamweel Ahmad Hiba Shamweel Radiological Sciences Department College of Applied Medical Sciences King Saud University Riyadh KSA Department of Medical Laboratory Technology Faculty of Applied Medical Sciences King Abdulaziz University Rabegh KSA Botany and Microbiology Department College of Science King Saud University Riyadh KSA Department of Medical Laboratory Sciences College of Medical Sciences Prince Sattam Bin Abdulaziz University Al Kharj KSA Al-Haram Diagnostic Research and Training Center Srinagar Kashmir

Background: Nosocomial infections have become a major challenge in healthcare facilities as they affect the quality of medical care. Radiological imaging plays a crucial role in medical diagnosis. However, the equipment and accessories used increase the risk of transmission of nosocomial bacteria. Objective: This study aims to reveal the extent and nature of microbiological contamination in four hospital diagnostic imaging departments to determine their potential role in the spread of nosocomial bacteria and to evaluate the effectiveness of routine daily disinfection practices in controlling microorganisms in diagnostic imaging departments. Methods & Results: In each department, swabs were taken from the surfaces of selected parts of the equipment and accessories three times a day (early morning, noon, and evening) for five consecutive days. Bacteria were isolated from 65 swabs (36.1% of all samples). The bacteria were isolated 3 times (4.6%) in the morning, 16 times (24.6%) at midday, and 46 times (70.7%) in the evening. The bacteria isolated were Escherichia coli (isolated 34 times;52.3%), Staphylococcus aureus (20 times;30.8%), Staphylococcus epidermidis (6 times;9.3%), and Klebsiella species (5 times;7.7%). Discussion & Conclusion: Findings demonstrated that radiology equipment and accessories are not free of bacteria and further improvements in the sterilization and disinfection of radiology equipment and accessories are needed to protect staff and patients from nosocomial infections.

关键词： Diagnostic Imaging Department Nosocomial Infection Radiographic Accessories Radiographic Equipment

A cause to consider for chronic unresolving diarrhea

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Gastroenterology Report 2016年第2期4卷 162-164,I0003页

作者： talal Hilal Department of Internal Medicine University of KentuckyLexingtonKentuckyUSA

A 36-year-old male who carried a diagnosis of irritable bowel syndrome presented with chronic watery diarrhea and was found to have hepatomegaly on physical exam.A computed tomography(CT)scan of the abdomen revealed hepatomegaly with lesions suspicious for metastatic disease.A colonoscopy revealed a polypoid lesion in the terminal ileum,which was biopsied,revealing a neuroendocrine tumor(NET).He was treated with palliative octreotide and chemoembolization of liver metastases until disease *** case highlights the importance of considering functional NETs,especially carcinoid syndrome,in patients with chronic unresolving diarrhea,since early diagnosis allows for further treatment options that can prolong survival.

关键词： chronic diarrhea carcinoid syndrome neuroendocrine tumor hepatomegaly

A Locality-Sensitive Hashing-Based Jamming Detection System for IoT Networks

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Computers, Materials & Continua 2022年第12期73卷 5943-5959页

作者： P.Ganeshkumar talal Albalawi Computer Science Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)RiyadhSaudi Arabia

Internet of things(IoT)comprises many heterogeneous nodes that operate together to accomplish a human friendly or a business task to ease the ***,IoT nodes are connected in wireless media and thus they are prone to jamming *** the present scenario jamming detection(JD)by using machine learning(ML)algorithms grasp the attention of the researchers due to its virtuous *** this research,jamming detection is modelled as a classification problem which uses several *** one/two or minimumnumber of features produces vague results that cannot be *** the relationship between the feature and the class label cannot be efficiently determined,specifically,if the chosen number of features for training is minimum(say 1 or 2).To obtain good results,machine-learning algorithms are trained by large number of data ***,collection of large number of datasets to solve jamming detection is not easy and most of the times generation and collection of large data sets become *** this paper,to solve this problem,more number of features with nominal number of data’s is considered that eases the data collection and the classification *** this research,an efficient technique based on locality sensitive hashing(LSH)for K-nearest neighbor algorithm(K-NN),which takes less time for constructing and querying the hash table that gives good accuracy is proposed and *** the results,it is clear that the obtained results are validatable and the model is more sensible.

关键词： IoT jamming detection K-NN machine learning

Normal and abnormal grain growth in magnesium:Experimental observations and simulations

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Journal of Materials Science & Technology 2020年第15期47卷 257-270页

作者： Risheng Pei Sandra Korte-Kerzel talal Al-Samman Institut fur Metallkunde und Materialphysik RWTH Aachen UniversityD-52056AachenGermany

Commercial purity as-cast magnesium was hot rolled and subsequently annealed at different temperatures in order to investigate its grain growth behavior and link it to the texture *** at an intermediate temperature of 220℃ gave rise to abnormal grain growth with a few grains reaching a grain diameter 10 times larger than the *** the annealing temperature to 350℃ yielded normal grain *** types of grain growth revealed a strengthening of the(0001) texture *** is hypothesized that a dislocation density gradient after recrystallization grants(0001) grains a size advantage during early stages of *** type of growth will be,however,determined by the mobility of the present grain boundaries and triple junction drag,which are strongly dependent on the annealing *** above hypothesis of the interplay between these parameters was explored through curvature-and re sidual dislocation-density-gradient-driven grain growth simulations using a formerly developed level-set *** simulation outcome suggests that application of such a modeling approach in microstructure studies of magnesium can provide valuable new insights into the problem of grain growth and associated texture evolutio n.

关键词： Pure magnesium Grain growth Texture Dislocation density gradient Level-set modeling

Electric Discharge in Pin-Plate Audio Frequency Plasma

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Chinese Physics Letters 2011年第11期28卷 166-169页

作者： A.A.Azooz S.K.talal Department of physics college of sciencemosul universitymosuliraq Department of physics college of educationzakho university zakhoiraq

Experimental results on some properties of electric discharge initiated by audio frequency voltages in the range of 50–10000 Hz are *** results indicate that there are at least two modes of plasma ionic oscillations.A resonance-type behavior is seen when the driving field frequency becomes equal to the plasma ionic *** results for plasma density and plasma temperature for both modes are presented.

关键词： Plasma driving initiated