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Hematological picture of pediatric Sudanese patients with visceral leishmaniasis and prediction of leishmania donovani parasite load

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World Journal of Clinical Cases 2024年第30期12卷 6374-6382页

作者： Zeinab Ibrahim Ahmed Elnoor Omaima Abdelmajeed Alamin Mustafa Thuraya Gasim Shima Algam Mohamed Musa abdelrahman hamza abdelmoneim Islamia Ibrahim Ahmed Omer Hiba Awadelkareem Osman Fadl Department of Pathology Faculty of MedicineOmdurman Ahilia UniversityOmdurmanKhartoumSudan Mohammed Alamin Hamid Pediatric Hospital Omdurman KhartoumSudan Department of Hematology and Blood Transfusion Medicine Federal Ministry of HealthKhartoumSudan Department of Pediatrics Faculty of MedicineOmdurman Islamic UniversityOmdurmanKhartoumSudan Tropical Diseases Teaching Hospital OmdurmanKhartoumSudan Faculty of Medicine Al-Neelain UniversityKhartoumSudan Faculty of Medicine Omdurman Islamic UniversityOmdurmanKhartoumSudan Department of Pediatrics Faculty of MedicineUniversity of Science and TechnologyKhartoumSudan Department of Hematology Faculty of Medical Laboratory SciencesAl-Neelain UniversityKhartoumSudan

BACKGROUND Visceral leishmaniasis(VL)is a systemic protozoan infection caused by Leishmania donovani(***)and transmitted by sand flies,causing macrophage invasion in the liver,spleen,and bone *** of VL is currently based on clinical signs,symptoms,and specific in-vitro markers and bone marrow ***,VL's specific hematological and bone marrow manifestation in Sudanese pediatric patients is not well *** To examine the blood and bone marrow characteristics in pediatric patients from Sudan who have *** This is a retrospective hospital-based study with a sample of 107 consecutive Sudanese pediatric *** data focused on hematological and bone marrow *** included only the completed records of the pediatric patients with VL in the Tropical Disease Teaching Hospital in Khartoum,Sudan from the period of 2016 to *** The majority of pediatric patients included in this study are below 5-years-old(n=59,55.2%).Moreover,anemia,thrombocytopenia,and leukopenia were among the prevalent characteristics in the population under *** further analyze the data,we developed a machine learning model using boosted forest algorithms to predict *** parasites load,with a mean accuracy of 0.88 for the training dataset and an accuracy of 0.46,0.50,and 0.74 for mild,moderate,and severe *** parasite load in the validation *** This study shows that the most common bone marrow change among Sudanese VL children was increased chronic inflammatory cells(n=88,82.2%)with present macrophage hemophagocytes(n=103,96.3%).While anemia and thrombocytopenia were the most common hematological *** results will hopefully lead to an early diagnosis and hence better management for Sudanese pediatric patients with suspected VL.

关键词： Machine learning Bone marrow Hematological changes Tropical diseases Leishmania donovani Visceral leishmaniasis

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Extensive Study of Cloud Computing Technologies, Threats and Solutions Prospective

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Computer Systems Science & Engineering 2022年第4期41卷 225-240页

作者： Mwaffaq Abu-Alhaija Nidal M.Turab abdelrahman hamza Department of Networks and Information Security Faculty of Information TechnologyAl-Ahliyya Amman UniversityAmman19328Jordan Department of Computer Science Information TechnologyAl-Ahliyya Amman UniversityAmman19328Jordan

Infrastructure as a Service(IaaS)provides logical separation between data,network,applications and machines from the physical constrains of real *** is one of the basis of cloud ***,security issues are also gradually emerging with virtualization of cloud *** security aspects of cloud virtualization will be explored in this research paper,security recognizing potential threats or attacks that exploit these vulnerabilities,and what security measures are used to alleviate such *** addition,a dis-cussion of general security requirements and the existing security schemes is also *** shown in this paper,different components of virtualization environ-ment are targets to various attacks that in turn leads to security issues compromis-ing the whole cloud *** this paper an overview of various cloud security aspects is also *** attack scenarios of virtualization envir-onments and security solutions to cater these attacks have been discussed in the *** then proceed to discuss API security concerns,data security,hijacking of user account and other security *** aforementioned discussions can be used in the future to propose assessment criteria,which could be useful in ana-lyzing the efﬁciency of security solutions of virtualization environment in the face of various virtual environment attacks.

关键词： Cloud computing environment paravirtualization full virtualization cloud virtualization security hypervisor virtual machines

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Unraveling the nature of sensing in electrostatic MEMS gas sensors

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Microsystems & Nanoengineering 2024年第3期10卷 109-117页

作者： Yasser S.Shama Sasan Rahmanian hamza Mouharrar Rana abdelrahman Alaaeldin Elhady Eihab M.Abdel-Rahman Systems Design Engineering University of Waterloo200 University Ave WWaterloo N2L 3G1 ONCanada Mechanical Engineering Benha Faculty of EngineeringBenha UniversityBenha 13511Egypt

This paper investigates the fundamental sensing mechanism of electrostatic MEMS gas *** compares among the responsivities of a set of MEMS isopropanol sensors before and after functionalization,and in the presence and absence of electrostatic fields when operated in static and dynamic detection *** the static mode,we found that the sensors do not exhibit a measurable change in displacement due to added *** the other hand,bare sensors showed a clear change in displacement in response to isopropanol *** the dynamic mode,functionalized sensors showed a measurable frequency shift due to the added mass of isopropanol *** the presence of strong electrostatic fields,the measured frequency shift was found to be threefold larger than that in their absence in response to the same concentration of isopropanol *** enhanced responsivity of dynamic detection allows the sensors to measure the vapor mass captured by the functional material,which is not the case for static *** detection of isopropanol by bare sensors in static mode shows that change in the medium permittivity is the primary sensing *** enhanced responsivity of dynamic mode sensors when operated in strong electrostatic fields shows that their sensing mechanism is a combination of a weaker added mass effect and a stronger permittivity *** findings show that electrostatic MEMS gas sensors are independent of the direction of the gravitational field and are,thus,robust to changes in *** is erroneous to refer to them as‘gravimetric’sensors.

关键词： mechanism electrostatic measurable

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Nanocellulose-Graphene Hybrids: Advanced Functional Materials as Multifunctional Sensing Platform

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Nano-Micro Letters 2021年第6期13卷 231-267页

作者： abdelrahman Brakat Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084People’s Republic of China

Naturally derived nanocellulose with unique physiochemical properties and giant potentials as renewable smart nanomaterials opens up endless novel advanced functional materials for multi-sensing ***,integrating inorganic functional two-dimensional carbon materials such as graphene has realized hybrid organic-inorganic nanocomposite materials with precisely tailored properties and multi-sensing ***,the affinity,stability,dispersibility,modification,and functionalization are some of the key merits permitting their synergistic interfacial interactions,which exhibited highly advanced multifunctional hybrid nanocomposites with desirable ***,the high performance of such hybrids could be achievable through green and straightforward *** this context,the review covered the most advanced nanocellulose-graphene hybrids,focusing on their synthetization,functionalization,fabrication,and multi-sensing *** hybrid films exhibited great potentials as a multifunctional sensing platform for numerous mechanical,environmental,and human bio-signals detections,mimicking,and in-situ monitoring.

关键词： Nanocellulose Graphene Nanocomposites Hybrid materials Multi-sensing

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Coseismic site response and slope instability using periodic boundary conditions in the material point method

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第3期15卷 641-658页

作者： abdelrahman Alsardi Alba Yerro Department of Civil and Environmental Engineering Virginia TechBlacksburg24060VirginiaUSA

This paper proposed the explicit generalized-a time scheme and periodic boundary conditions in the material point method(MPM)for the simulation of coseismic site *** proposed boundary condition uses an intuitive particle-relocation algorithm ensuring material points always remain within the computational *** explicit generalized-a time scheme was implemented in MPM to enable the damping of spurious high frequency ***,the MPM was verified against finite element method(FEM).Secondly,ability of the MPM in capturing the analytical transfer function was ***,a symmetric embankment was adopted to investigate the effects of ground motion arias intensity(I_(a)),geometry dimensions,and constitutive *** results show that the larger the model size,the higher the crest runout and settlement for the same ground *** using a Mohr-Coulomb model,the crest runout increases with increasing I_(a).However,if the strain-softening law is activated,the results are less influenced by the ground ***,the MPM results were compared with the Newmark sliding block *** simplified analysis herein highlights the capabilities of MPM to capture the full deformation process for earthquake engineering applications,the importance of geometry characterization,and the selection of appropriate constitutive models when simulating coseismic site response and subsequent large deformations.

关键词： Coseismic site response Periodic conditions Time integration Material point method(MPM)

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3D-shaped 3D-continuously graphene cellulose(3D^(2)GC)architecture

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Nano Research 2024年第7期17卷 6695-6699页

作者： abdelrahman Brakat Hongwei Zhu State Key Lab of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China

In the endeavor to develop three-dimensional(3D)-architected sophisticated hierarchical structures,the synergy between inplane and out-of-plane interactions at interfaces offers new *** interplay,governed by van der Waals(vdW)interfacial nanoarchitectonics,facilitates the design of efficient thermally conductive *** work delves into the kinetics underlying a dual-templating strategy,seamlessly integrating two-dimensional(2D)-graphene sheets with one-dimensional(1D)-cellulose chains at heterointerfaces,thereby transforming into 3D-shaped and 3D-continuously anisotropic structures,termed as(3D^(2)GC)***,we designed and fabricated an anisotropic graphene cellulose scaffold(GCS)employing a nickel *** as-grown GCS replicates the 3D-shaped and configuration of the *** 3D-continuously interconnected fibrous-porous network of the GCS,combined with its anisotropic thermal properties(λ_(axial)/λ_(radial)),not only is promising for advanced thermal technologies but also offers advantages in cost-effectiveness and eco-effectiveness.

关键词： two-dimensional(2D)-graphene one-dimensional(1D)-cellulose heterointerface anisotropic three-dimensional(3D)-architecture

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Resistin is not an appropriate biochemical marker to predict severity of acute pancreatitis:A case-controlled study

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World Journal of Gastroenterology 2014年第41期20卷 15351-15357页

作者： Hamdi Al-Maramhy abdelrahman I abdelrahman Samer Sawalhi Department of Surgery College of MedicineTaibah University Department of Radiology King Fahd Hospital Department of Surgery College of Medicine-Dalhousie University

AIM: To assess levels of serum resistin upon hospital admission as a predictor of acute pancreatitis (AP) severity.

关键词： Acute pancreatitis Resistin Body mass index Waist circumference

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Salivary C-reactive protein and mean platelet volume as possible diagnostic markers for late-onset neonatal pneumonia

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World Journal of Clinical Pediatrics 2024年第1期13卷 41-51页

作者： Wafaa Ahmed Metwali abdelrahman Mohamed Elmashad Sahar Mohey Eldin Hazzaa Mohammed Al-Beltagi Mohamed Basiony hamza Department of Pediatric Faculty of MedicineTanta UniversityTanta 31511AlgahrbiaEgypt Department of Clinical Pathology Faculty of MedicineTanta UniversityTanta 31511AlgahrbiaEgypt Department of Pediatric University Medical CenterDr.Suliaman Al Habib Medical GroupManama 26671ManamaBahrain Department of Pediatric University Medical CenterKing Abdulla Medical CityArabian Gulf UniversityManama 26671ManamaBahrain

BACKGROUND Neonatal sepsis,a formidable threat to newborns,is a leading cause of neonatal mortality,with late-onset sepsis manifesting after 72 hours post-birth being particularly ***,a prevalent sepsis presentation,poses a significant risk,especially during the neonatal phase when lung defenses are *** diagnosis of pneumonia is imperative for timely and effective ***,a minimally invasive diagnostic medium,holds great promise for evaluating infections,especially in *** To investigate the potential of serum C-reactive protein(CRP),salivary CRP(sCRP),and mean platelet volume(MPV)as diagnostic markers for late-onset neonatal pneumonia(LONP).METHODS Eighty full-term neonates were systematically examined,considering anthropometric measurements,clinical manifestations,radiology findings,and essential biomarkers,including serum CRP,sCRP,and *** The study reveals noteworthy distinctions in serum CRP levels,MPV,and the serum CRP/MPV ratio between neonates with LONP and healthy *** exhibited a robust discriminatory ability[area under the curve(AUC)=0.87]with high sensitivity and specificity at a cutoff value of>*** between serum CRP,sCRP,and MPV were also ***,sCRP demonstrated excellent predictive value for serum CRP levels(AUC=0.89),underscoring its potential as a diagnostic *** This study underscores the diagnostic promise of salivary and serum biomarkers,specifically MPV and CRP,in identifying and predicting LONP among *** findings advocate for further research to validate their clinical utility in larger neonatal cohorts.

关键词： Neonatal sepsis Late-onset pneumonia Salivary C-reactive protein Mean platelet volume Diagnostic markers Newborn infections

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Low Temperature Reduction of Graphene Oxide Using Hot-plate for Nanocomposites Applications

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Journal of Materials Science & Technology 2016年第5期32卷 411-418页

作者： abdelrahman Hussein Sourav Sarkar Byungki Kim School of Mechatronics Engineering Korea University of Technology and Education

A green, easy to reproduce method to obtain thermally reduced graphene oxide （GO） is described, The only requirement is a heating source, like a hot plate, that can reach -225 ℃ without any special setup requirements. Upon addition of graphene oxide, effective reduction could be achieved within 10 s. Starting flake size affects the yield of graphene, final structure and composition. A detailed characterization of the produced graphene using thermal analysis, spectroscopic methods, electron microscopy, X-ray diffraction and atomic force microscopy is presented. Application of the produced graphene as a filler to epoxy resin for mechanical reinforcement is also reported. Smaller flakes （Ds0 = 5.7 μm） showed improved ultimate tensile strength, fracture strain and plane strain fracture toughness compared to larger flakes （Ds0 = 47.9 μm） that showed negative effect. Both flake sizes showed a negligible effect on Young＇s modulus.

关键词： Graphene Nanocomposite Mechanical properties Fracture toughness

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A new integrated approach to resolve the saturation profile using high-resolution facies in heterogenous reservoirs

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Petroleum 2022年第3期8卷 318-331页

作者： abdelrahman Elkhateeb Reza Rezaee Ali Kadkhodaie WA School of Mines:Minerals Energy and Chemical EngineeringCurtin UniversityPerthAustralia Earth Sciences Department Faculty of Natural SciencesUniversity of TabrizTabrizIran

The saturation calculation in complex reservoirs remains a major challenge to the oil and gas *** simple formations,a tendency towards simple saturation models such as Archie or Simandoux for clean and shaly reservoirs respectively is always *** models were found to be working effectively in homogeneous formations within which the porosity and permeability are linked in the light of a simple facies *** the rocks show some degrees of heterogeneity,the well-logs are usually affected by different *** adversely results in a compromised or averaged log profiles that may affect the saturation *** wells drilled across a shaly sand of high heterogeneity have been studied in the Perth Basin,Western *** aim is to resolve the hydrocarbon saturation and explain the high productivity results,despite the high water saturation,obtained through a conducted formation well test across the interested reservoir zones.A new integration technique between a suite of conventional and advanced logging tools together with the capillary pressure measurements has been carried out to generate a high-resolution reservoir saturation profile,that is lithofacies *** different independent methods were used in the studied wells to calculate the saturation and to reduce the uncertainty of the final estimated *** methods are the resistivity-based saturation,the NMR-based irreducible saturation,and a new application through saturation height ***,through the workflow,an effective calibration for the magnetic resonance T2 cutoff has been applied that is supported by the excellent reservoir production behavior from such complex *** methodology will help resolve the saturation calculation as one of the most challenging reservoir parameters,particularly where the resistivity logs are affected in complicated shaly sand *** effectiveness of the workflow shines the possibility to predict h

关键词： Reservoir facies Permeability Hydraulic flow units Formation evaluation Shaly sand Saturation height modeling

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