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New insights into hydraulic fracturing fluids used for hightemperature wells

Petroleum 2021年第1期7卷 70-79页

作者： Tariq Almubarak Leiming Li Jun Hong Ng Hisham Nasr-El-Din mohammed alkhaldi Texas A&M University USA Aramco Services Company Saudi Arabia Saudi Aramco EXPEC ARC Saudi Arabia

Current interest in deep,low-permeability formations(<10 md)demands accelerated development of high-temperature hydraulic fracturing *** guar systems break down above 300°F and require higher polymer loadings to maintain thermal ***,higher polymer loadings generate more residue and damage to the proppant pack and the *** resolve these problems,a variety of high-temperature stabilizers are added to enhance the thermal stability of these fracturing fluids at temperatures above 300*** focus of this work is to:(1)identify those additives that best enhance temperature stability of fracturing fluids and(2)study the rheological influence of incorporating these additives on the fracturing fluid *** experimental fracturing-fluid solutions were prepared at a total polymer concentration of 30 and 40 lb/1000 *** such as synthetic polymer,oxygen scavengers,crosslinkers,crosslinker delay additives,and pH buffers were examined in this *** polymer solutions were crosslinked with a metallic crosslinker between 200 and 400°*** measurements were carried out in a highpressure/high-temperature(HP/HT)rheometer to evaluate rheology and thermal *** show that adding a synthetic polymer and a crosslinker with the slowest reaction rate improves the fracturing fluid thermal *** the three other additives tested,oxygen scavengers showed the greatest enhancement to thermal stability while pH buffers showed the *** the addition of high-temperature stabilizing additives,the fracturing fluid in this work was able to maintain a stable performance at temperatures up to 400°*** the thermal stability of fracturing fluids at a lower polymer loading remains a challenge in the *** work proposes techniques that can be used to enhance the thermal stability of fracturing *** knowledge about these different techniques will allow for better additive development and a

关键词： Oxygen scavenger Crosslinker Crosslinker delay Shear tolerance High temperature Synthetic polymer CMHPG Buffers

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Rethinking and strengthening the Global Health Diplomacy through triangulated nexus between policy makers,scientists and the community in light of COVID-19 global crisis

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Global Health Research and Policy 2021年第1期6卷 374-379页

作者： mohammed alkhaldi Nigel James Vijay Kumar Chattu Sara Ahmed Hamza Meghari Kirsty Kaiser Carel I.Jsselmuiden Marcel Tanner McGill University Faculty of MedicineMontrealCanada University of Basel BaselSwitzerland Swiss Tropical and Public Health Institute BaselSwitzerland Department of Public Health Unit of Health Systems and PoliciesBaselSwitzerland Council on Health Research for Development COHREDGenevaSwitzerland Health Policy&Demography/Department of Health Policy and Administration The Pennsylvania State UniversityPennsylvaniaUSA Department of Medicine Faculty of MedicineUniversity of TorontoTorontoCanada Institute of International Relations The University of the West IndiesSt.AugustineTrinidad and Tobago Faculty of Medicine School of Physical&Occupational TherapyMcGill University Health CenterClinical EpidemiologyMontrealCanada Centre de recherche interdisciplinaire en réadaptation(CRIR) Constance Lethbridge Rehabilitation Center du CIUSSS du Centre-Ouest-de-l’Île-de-MontréalMontrealCanada Initiative pour le développement de nouvelles technologies et pratiques en réadaptation(INSPIRE) Institut de réadaptation Gingras-Lindsay de MontréalCIUSSS Centre-Est-de-l’ile-de-MontréalMontrealCanada Great Ormond Street Hospital for Children NHS Foundation TrustLondonUK Global Health and Development Institute for Global HealthUniversity College London UCLLondonUK Women Deliver Organization New YorkUSA COHRED Africa Cape TownSouth Africa Epidemiology and Medical Parasitology University of BaselBaselSwitzerland

The COVID-19 pandemic is considerably the biggest global health challenge of this modern *** across all regions of the world,this corona virus disease has disrupted even some of the most advanced economies and healthcare *** an increasing global death toll and no near end in sight,questions on the efficacy of global response mechanisms,including the role and relevancy of global health institutions,have *** a reflexive content analytic approach,this study sheds light on some of these questions,underscoring the disconnect between science,policymaking,and *** health funding approaches;politicization of the pandemic,including political blame gaming;mistrust of government and other institutions;and a lack of robust accountability measures are some of the pandemic response ***,COVID-19 has also presented an opportunity for a collaboration that may potentially solidify global solidarity.A pandemic response built on strategic global health diplomacy,vaccine diplomacy,and science diplomacy can spur both political and economic benefits,advancing development,health security,and *** virus thrives and flourishes in face of political divisions and lack of *** the current global crisis has exacerbated the existing social injustices in societies,national unity and global solidarity is essential to winning the fight against the COVID-19 pandemic.

关键词： COVID-19 Global health diplomacy Vaccine diplomacy And science diplomacy Policy

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Unveiling the impact:COVID-19's influence on bacterial resistance in the Kingdom of Bahrain

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World Journal of Virology 2025年第1期14卷 83-98页

作者： Nermin K Saeed Safiya K Almusawi Noor A Albalooshi mohammed Al-Beltagi Medical Microbiology Section Department of PathologySalmaniya Medical ComplexGovernmental HospitalsManama 12Bahrain Medical Microbiology Section Department of PathologyRoyal College of Surgeons in Ireland-Medical University of BahrainBusaiteen 15503MuharraqBahrain Department of Paediatrics Faculty of MedicineTanta UniversityTanta 31511AlghrabiaEgypt Department of Pediatric University Medical CenterKing Abdulla Medical CityArabian Gulf UniversityManama 26671AlgharbiaBahrain

BACKGROUND Antibiotic resistance is a growing global health threat,and understanding local trends in bacterial isolates and their susceptibility patterns is crucial for effective infection control and antimicrobial *** coronavirus disease 2019(COVID-19)pandemic has introduced additional complexities,potentially influencing these *** To analyze trends in bacterial isolates and their antibiotic susceptibility patterns at Salmaniya Medical Complex from 2018 to 2023,with a specific focus on the impact of the COVID-19 pandemic on these *** A retrospective analysis of microbiological data was conducted,covering the period from 2018 to *** study included key bacterial pathogens such as Escherichia coli(***),Klebsiella pneumoniae,Acinetobacter baumannii,Pseudomonas aeruginosa,and Staphylococcus aureus,among *** antibiotic susceptibility profiles of these isolates were assessed using standard laboratory *** contextualize the findings,the findings were compared with similar studies from other regions,including China,India,Romania,Saudi Arabia,the United Arab Emirates,Malaysia,and United *** The study revealed fluctuating trends in the prevalence of bacterial isolates,with notable changes during the COVID-19 *** example,a significant increase in the prevalence of Staphylococcus aureus was observed during the pandemic years,while the prevalence of *** showed a more variable *** resistance rates varied among the different pathogens,with a concerning rise in resistance to commonly used antibiotics,particularly among Klebsiella pneumoniae and ***,the study identified an alarming increase in the prevalence of multidrug-resistant(MDR)strains,especially within Klebsiella pneumoniae and *** *** impact of the COVID-19 pandemic on these trends was evident,with shifts in the frequency,resistance patterns,and the emergence of MDR bacteria among several key ***

关键词： Multidrug-resistant organisms Antibiotic susceptibility COVID-19 pandemic Antimicrobial stewardship Bacterial isolates Salmaniya Medical Complex Bahrain

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Gut virome:New key players in the pathogenesis of inflammatory bowel disease

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World Journal of Methodology 2025年第2期15卷 27-43页

作者： Helal F Hetta Rehab Ahmed Yasmin N Ramadan Hayam Fathy mohammed Khorshid Mohamed M Mabrouk Mai Hashem Department of Medical Microbiology and Immunology Faculty of MedicineAssiut UniversityAssiut 71515Egypt Division of Microbiology Immunology and BiotechnologyFaculty of pharmacyUniversity of TabukTabuk 71491Saudi Arabia Division of Microbiology Immunology and BiotechnologyDepartment of Natural Products and Alternative MedicineFaculty of PharmacyUniversity of TabukTabuk 71491Saudi Arabia Department of Internal Medicine Division HepatogastroenterologyAssiut UniversityAssiut 71515Egypt Department of Clinical Research Egyptian Developers of Gastroenterology and Endoscopy FoundationCairo 11936Egypt Department of Internal Medicine Faculty of Medicine.Tanta UniversityTanta 31527Egypt Department of Tropical Medicine Gastroenterology and HepatologyAssiut University HospitalAssiut 71515Egypt

Inflammatory bowel disease(IBD)is a chronic inflammatory illness of the *** the mechanism underlying the pathogenesis of IBD is not fully under-stood,it is believed that a complex combination of host immunological response,environmental exposure,particularly the gut microbiota,and genetic suscept-ibility represents the major *** gut virome is a group of viruses found in great frequency in the gastrointestinal tract of *** gut virome varies greatly among individuals and is influenced by factors including lifestyle,diet,health and disease conditions,geography,and *** majority of research has focused on the significance of gut bacteria in the progression of IBD,although viral populations represent an important component of the *** conducted this review to highlight the viral communities in the gut and their expected roles in the etiopathogenesis of IBD regarding published research to date.

关键词： Inflammatory bowel disease Pathogenesis Gut virome Bacteriophage Eukaryotic viruses

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Decoding molecular mechanisms:brain aging and Alzheimer's disease

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Neural Regeneration Research 2025年第8期20卷 2279-2299页

作者： Mahnoor Hayat Rafay Ali Syed Hammad Qaiser Mohammad Uzair Khalid Al-Regaiey Roaa Khallaf Lubna Abdullah mohammed Albassam Imdad Kaleem Xueyi Wang Ran Wang Mehwish SBhatti Shahid Bashir Atta-ur-Rahman School of Applied Biosciences(ASAB) National University of Sciences and Technology(NUST)IslamabadPakistan Department of Biotechnology Quaid-i-Azam UniversityIslamabadPakistan Department of Biological Sciences Faculty of Basic&Applied SciencesInternational Islamic University Islamabad(IIUI)IslamabadPakistan Department of Bioengineering King Fahd University of Petroleum and MineralsDhahranSaudi Arabia Department of Physiology College of MedicineKing Saud UniversityRiyadhSaudi Arabia Department of Neurology Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Department of Mental Health Neuroscience CenterKing Fahad Specialist HospitalDammamSaudi Arabia Department of Biosciences Commission on Science and Technology for Sustainable Development in the South(COMSATS University)IslamabadPakistan Department of Psychiatry The First Hospital of Hebei Medical UniversityShijiazhuangHebei ProvinceChina Mental Health Institute of Hebei Medical University ShijiazhuangHebei ProvinceChina Department of Neurobiology and Behavior University of CaliforniaIrvineCAUSA Neuroscience Center King Fahad Specialist Hospital DammamDammamSaudi Arabia

The complex morphological,anatomical,physiological,and chemical mechanisms within the aging brain have been the hot topic of research for *** aging process alters the brain structure that affects functions and cognitions,but the worsening of such processes contributes to the pathogenesis of neurodegenerative disorders,such as Alzheimer's *** these observable,mild morphological shifts,significant functional modifications in neurotransmission and neuronal activity critically influence the aging *** these changes is important for maintaining cognitive health,especially given the increasing prevalence of age-related conditions that affect *** review aims to explore the age-induced changes in brain plasticity and molecular processes,differentiating normal aging from the pathogenesis of Alzheimer's disease,thereby providing insights into predicting the risk of dementia,particularly Alzheimer's disease.

关键词： Alzheimer’s disease brain aging cognitive health dementia molecular mechanisms neuronal activity neuroplasticity neurotransmission

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Deflection behavior of a prestressed concrete beam reinforced with carbon fibers at elevated temperatures

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Frontiers of Structural and Civil Engineering 2019年第1期13卷 81-91页

作者： mohammed FARUQI mohammed Sheroz KHAN Department of Civil and Architectural Engineering Texas A&M University--KingsvilleTexasUSA

Fiber reinforced polymer(FRP) have unique advantages like high strength to weight ratio,excellent corrosion resistance,improving deformability and cost *** advantages have gained wide acceptance in civil engineering *** tendons for prestressing applications are emerging as one of the most promising technologies in the civil engineering ***,the behavior of such members under the influence of elevated temperatures is still *** knowledge and application of this could lead to a cost effective and practical considerations in fire safety ***,this study examines the deflection behavior of the carbon fiber reinforced polymer(CFRP) prestressed concrete beam at elevated *** this article,an analytical model is developed which integrates the temperature dependent changes of effective modulus of FRP in predicting the deflection behavior of CFRP prestressed concrete beams within the range of practical *** model is compared with a finite element mode (FEM) of a simply supported concrete beam prestressed with CFRP subjected to practical elevated *** addition,comparison is also made with an indirect reference to the real behavior of the *** results of the model correlated reasonably with the finite element model and the real ***,a practical application is provided.

关键词： FRP CFRP concrete elevated temperatures deflections prestress

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MULTIDIMENSIONAL RELAXATION APPROXIMATIONS FOR HYPERBOLIC SYSTEMS OF CONSERVATION LAWS

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Journal of Computational Mathematics 2007年第4期25卷 440-457页

作者： mohammed Seaid UniversitSt Kaiserslautern Fachbereich Mathematik 67663 Kaiserslautern Germany

We construct and implement a non-oscillatory relaxation scheme for multidimensional hyperbolic systems of conservation laws. The method transforms the nonlinear hyperbolic system to a semilinear model with a relaxation source term and linear characteristics which can be solved numerically without using either Riemann solver or linear iterations. To discretize the relaxation system we consider a high-resolution reconstruction in space and a TVD Runge-Kutta time integration. Detailed formulation of the scheme is given for problems in three space dimensions and numerical experiments are implemented in both scalar and system cases to show the effectiveness of the method.

关键词： Multidimensional hyperbolic systems Relaxation methods Non-oscillatory reconstructions Asymptotic-preserving schemes.

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Recent advances on flexible electrodes for Na-ion batteries and Li–S batteries

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Journal of Energy Chemistry 2019年第5期28卷 15-44页

作者： mohammed-Ibrahim Jamesh Department of Physics and Materials Science City University of Hong Kong Applied and Plasma Physics School of Physics (A28) University of Sydney CSIR-Central Electrochemical Research Institute-Chennai Unit CSIR Madras Complex

Flexible energy storage devices are essential for emerging flexible electronics. The existing state-of-the-art Li-ion batteries are slowly reaching their limitation in terms of cost and energy density. Hence, flexible Na-ion batteries (SIBs) with abundanee Na resources and Li-S batteries with high energy density become the alternative for the Li-ion batteries in future. This review summarizes the recent advances in the development of flexible electrode materials for SIBs with metallic matrix and carb on aceous matrix such as carb on nano-tubes, carbon nano-fiber, graphene, carbon cloth, carbon fiber cloth, and cotton textiles. Then, the potential prototype flexible full SIBs are discussed. Further, the recent progress in the development of flexible electrode materials for Li-S batteries based on carb on nano-fiber, carb on nano-tubes, graphene, and cotton textiles is reviewed. Moreover, the design strategies of suitable interlayer, separator, electrolyte, and electrodes to prevent the dissolution and shuttle effect of polysulfides in flexible Li-S batteries are provided. Finally some prospective investigation trends towards future research of flexible SIBs and Li-S batteries are also proposed and discussed. The scientific and engineering knowledge gained on flexible SIBs and Li-S batteries provides conceivable development for practical application in near future.

关键词： Na-ion batteries Lithium-sulfur batteries Flexible Free-standing High performance energy storage Long cycle life

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Adaptive neuro fuzzy inference system for predicting sub-daily Zenith Wet Delay

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Geodesy and Geodynamics 2022年第4期13卷 352-362页

作者： Jareer mohammed Civil Engineering Department Wasit UniversityKutIraq

In recent years,the focus of tropospheric studies has evolved to GNSS meteorology and weather *** Zenith Wet Delay(ZWD),which might be assembled to the Integrated Water Vapour(IWV),is an essential component of the tropospheric *** predicted the ZWD with the required level of accuracy is crucial for weather *** scope of this study is to use the adaptive neural fuzzy inference system(ANFIS)to predict the ZWD for the following six-hour epoch based exclusively on the present the ZWD *** was developed and verified using 505 geographically and internationally distributed stations which were used for training and testing from 2008 to *** was assessed based on two ***,the correlation coefficient(R)values were found to be more than 0.8 in 98%of the stations,including those with highest and lowest latitudes,and the remaining 2% of stations located in coastal ***,the Root Mean Square Error(RMSE)values of the differences between the pre-dicted and the actual ZWD were considered to be the more important finding of the *** is,99.21% of the 505 stations had the RMSE values equal to or less than 3 cm,with only 4 stations having the RMSE values higher(0.2 mm)than 3 *** the results of this study achieved the required degree of ac-curacy from the predicted ZWD to be utilized in weather forecasting,they may also be beneficial for GNSS meteorology.

关键词： ANFIS ZWD Weather forecasting GNSS meteorology

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Modeling the capability of penetrating a jammed crowd to eliminate freezing transition

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Chinese Physics B 2016年第5期25卷 65-72页

作者： mohammed Mahmod Shuaib College of Shari’a and Islamic Studies in Al Ahsaa Department of Computer Sciences Al-Imam Muhammad Ibn Saud Islamic University (IMSIU)

Frozen state from jammed state is one of the most interesting aspects produced when simulating the multidirectional pedestrian flow of high density crowds. Cases of real life situations for such a phenomenon are not exhaustively *** observations in the Hajj crowd show that freezing transition does not occur very often. On the contrary, penetrating a jammed crowd is a common aspect. We believe the kindness of pedestrians facing others whose walking is blocked is a main factor in eliminating the frozen state as well as in relieving the jammed state. We refine the social force model by incorporating a new social force to enable the simulated pedestrians to mimic the real behavior observed in the Hajj *** are performed to validate the work qualitatively.

关键词： multidirectional flow jamming transition pedestrian behavior social force

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