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Blade Wrap Angle Impact on Centrifugal Pump Performance:Entropy Generation and Fluid-Structure Interaction Analysis

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Computer Modeling in Engineering & Sciences 2024年第7期140卷 109-137页

作者： Hayder Kareem Sakran Mohd Sharizal abdul aziz Chu Yee Khor School of Mechanical Engineering Universiti Sains MalaysiaEngineering CampusNibong TebalPenang14300Malaysia Chemical Engineering Department Faculty of EngineeringAl-Muthanna UniversityMuthanna66001Iraq Faculty of Mechanical Engineering&Technology Universiti Malaysia Perlis(UniMAP)ArauPerlis02600Malaysia

The centrifugal pump is a prevalent power equipment widely used in different engineering patterns,and the impeller blade wrap angle significantly impacts its performance.A numerical investigation was conducted to analyze the influence of the blade wrap angle on flow characteristics and energy distribution of a centrifugal pump evaluated as a low specific speed with a value of *** study investigates six impellermodels that possess varying blade wrap angles(95°,105°,115°,125°,135°,and 145°)that were created while maintaining the same volute and other geometrical *** investigation of energy loss was conducted to evaluate the values of total and entropy generation rates(TEG,EGR).The fluid-structure interaction was considered numerically using the software tools ANSYS Fluent and *** elastic structural dynamic equation was used to estimate the structural response,while the shear stress transport k–ωturbulence model was utilized for the fluid domain *** findings suggest that the blade wrap angle has a significant influence on the efficiency of the *** impeller featuring a blade wrap angle of 145°exhibits higher efficiency,with a notable increase of 3.76%relative to the original *** in the blade wrap angle impact the energy loss,shaft power,and pump *** model with a 145°angle exhibited a maximum equivalent stress of 14.8MPa and a total deformation of 0.084 *** results provide valuable insights into the intricate flow mechanism of the centrifugal pump,particularly when considering various blade wrap angles.

关键词： Centrifugal pump blade wrap angle entropy generation theory fluid-structure interaction hydraulic performance

On the existence and stability of traversable wormhole solutions with novel shapefunctions in the framework of F(R,L_(m))gravity

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Communications in Theoretical Physics 2024年第5期76卷 114-127页

作者： Sourav Chaudhary Jitendra Kumar S K Maurya Sweeti Kiroriwal abdul aziz Department of Mathematics Central University of HaryanaJant-PaliMahendergarhIndia Department of Mathematical and Physical Sciences College of Arts and ScienceUniversity of NizwaP.O.Box 33Nizwa 616Oman

In this work,we have explored wormhole(WH)solutions in F(R,L_(m))gravity by assuming the Morris-Thorne WH metric and F(R,Lm)=R/2+(1+γR)L_(m),whereγis the free model *** determined the WH solutions by utilizing two newly developed shape functions(SF)that satisfy all basic conditions for a WH’s physical *** also observe that the null energy condition(NEC)behaves ***,for both models,we use the volume integral quantifier(VIQ)and Tolman-Oppenheimer-Volkoff(TOV)equation to determine how much exotic matter is needed near the WH throat and the stability of the *** extensive detailed discussions of the matter components have been done via graphical *** obtained WH geometries meet the physically acceptable conditions for a stable wormhole.

关键词： energy conditions wormhole exotic matter F(R L_(m))gravity

Rates, predictors, and causes of readmission after transcatheter aortic valve replacement in patients with chronic kidney disease

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World Journal of Cardiology 2024年第7期16卷 402-411页

作者： Taha Teaima Gianfranco Bittar Carlini Rohan A Gajjar Imran aziz Sami J Shoura abdul-Rahim Shilbayeh Naim Battikh Tareq Alyousef Division of Cardiology Department of MedicineJohn H.StrogerJr.Hospital of Cook CountyChicagoIL 60612United States

BACKGROUND Transcatheter aortic valve replacement(TAVR)is a revolutionary procedure for severe aortic *** coexistence of chronic kidney disease(CKD)and TAVR introduces a challenge that significantly impacts patient *** To define readmission rates,predictors,and causes after TAVR procedure in CKD stage 1-4 *** We used the national readmission database 2018 and 2020 to look into readmission rates,causes and predictors after TAVR procedure in patients with CKD stage *** Out of 24758 who underwent TAVR and had CKD,7892(32.4%)patients were readmitted within 90 days,and had higher adjusted odds of being females(adjusted odds ratio:1.17,95%CI:1.02-1.31,P=0.02)with longer length of hospital stay>6 days,and more comorbidities including but not limited to diabetes mellitus,anemia,and congestive heart failure(CHF).CONCLUSION Most common causes of readmission included CHF(18.0%),sepsis,and complete atrioventricular *** readmission predictors with very close followup is warranted to prevent such high rate of readmission.

关键词： Chronic kidney disease Transcatheter aortic valve replacement Readmission Predictors Rates

Recurrent stroke admissions with vs without COVID-19 and associated in-hospital mortality: A United States nationwide analysis, 2020

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World Journal of Virology 2024年第3期13卷 98-106页

作者： Rupak Desai Sai Priyanka Mellacheruvu Sai Anusha Akella Adil Sarvar Mohammed Mushfequa Hussain abdul aziz Mohammed Pakhal Saketha Praveena Sunkara Jyotsna Gummadi Paritharsh Ghantasala Outcomes Research Independent ResearcherAtlantaGA 30033United States Department of Public Health University of MassachusettsLowellMA 01854United States Department of Internal Medicine One Brooklyn Health-Interfaith Medical CenterBrooklynNY 11213United States Department of Internal Medicine Central Michigan University College of MedicineSaginawMI 48602United States Department of Internal Medicine Kamineni Institute of Medical SciencesNarketpally 508254India Department of Internal Medicine Bhaskar Medical CollegeMoinabad 500075HyderabadIndia Department of Internal Medicine MedStar Medical GroupCharlotte HallMD 20622United States Department of Medicine Medstar Franklin Square Medical CenterBaltimoreMD 21237United States

BACKGROUND Coronavirus disease 2019(COVID-19)has been shown to increase the risk of ***,the prevalence and risk of recurrent stroke in COVID-19 patients with prior stroke/transient ischemic attack(TIA),as well as its impact on mor-tality,are not *** To evaluate the impact of COVID-19 on in-hospital mortality,length of stay,and healthcare costs in patients with recurrent *** We identified admissions of recurrent stroke(current acute ischemic stroke admissions with at least one prior TIA or stroke)in patients with and without COVID-19 using ICD-10-CM codes using the National Inpatient Sample(2020).We analyzed the impact of COVID-19 on mortality following recurrent stroke admissions by *** Of 97455 admissions with recurrent stroke,2140(2.2%)belonged to the COVID-19-positive *** COVID-19-positive group had a higher prevalence of diabetes and chronic kidney disease vs the COVID-19 negative group(P65 years,patients aged 45–64 years,Asians,Hispanics,whites,and blacks in the COVID-19 positive group had higher rates of all-cause mortality than the COVID-19 negative group(P65(OR:7.04,95%CI:5.24-9.44),males(OR:7.82,95%CI:5.38-11.35)compared to females(OR:6.15,95%CI:4.12-9.18),and in Hispanics(OR:15.47,95%CI:7.61-31.44)and Asians/Pacific Islanders(OR:14.93,95%CI:7.22-30.87)compared to blacks(OR:5.73,95%CI:3.08-10.68),and whites(OR:5.54,95%CI:3.79-8.09).CONCLUSION The study highlights the increased risk of all-cause in-hospital mortality in recurrent stroke patients with COVID-19,with a more pronounced increase in middle-aged patients,males,Hispanics,or Asians.

关键词： COVID-19 SARS-CoV-2 Recurrent stroke Mortality Hospitalization Comorbidities Acute ischemic stroke

National guidelines for the diagnosis and treatment of hilar cholangiocarcinoma

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World Journal of Gastroenterology 2024年第9期30卷 1018-1042页

作者： Faisal Saud Dar Zaigham Abbas Irfan Ahmed Muhammad Atique Usman Iqbal Aujla Muhammad Azeemuddin Zeba aziz Abu Bakar Hafeez Bhatti Tariq Ali Bangash Amna Subhan Butt Osama Tariq Butt abdul Wahab Dogar Javed Iqbal Farooqi Faisal Hanif Jahanzaib Haider Siraj Haider Syed Mujahid Hassan Adnan abdul Jabbar Aman Nawaz Khan Muhammad Shoaib Khan Muhammad Yasir Khan Amer Latif Nasir Hassan Luck Ahmad Karim Malik Kamran Rashid Sohail Rashid Mohammad Salih abdullah Saeed Amjad Salamat Ghias-un-Nabi Tayyab Aasim Yusuf Haseeb Haider Zia Ammara Naveed Department of Hepatopancreatic Biliary Surgery&Liver Transplant Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Hepatogastroenterology and Liver Transplantation Dr.Ziauddin University HospitalKarachi 75600SindhPakistan University of Aberdeen Aberdeen B243FXUnited Kingdom Department of Pathology Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Gastroenterology&Hepatology Pakistan Kidney and Liver Institute&Research CentreLahore 54000Pakistan Department of Radiology Aga Khan UniversityKarachi 74800Pakistan Department of Oncology Hameed Latif HospitalLahore 54000Pakistan Division of Hepatopancreatic Biliary Surgery&Liver Transplantation Shifa International HospitalIslamabad 44000Pakistan Department of Hepatopancreatic Biliary Surgery&Liver Transplant Shaikh Zayed Hospital and Post Graduate Medical InstituteLahore 54000Pakistan Department of Medicine Aga Khan University HospitalKarachi 74800Pakistan Department of Liver Transplant Pir Abdul Qadir Shah Jeelani Institute of Medical SciencesGambat 66020Pakistan Department of Medicine&Gastroenterology Lifecare Hospital and Research CentrePeshawar 25000Khyber PakhtunkhwaPakistan Department of Hepatopancreatobiliary&Liver Transplant Bahria International HospitalLahore 54000Pakistan Department of Surgery Hepatopancreatobiliary&Liver TransplantDow University of Health SciencesKarachi 74800Pakistan Department of Gastroenterology Hepatology&NutritionPir Abdul Qadir Shah Jeelani Institute of Medical SciencesGambat 66020Pakistan Department of Oncology Dr.Ziauddin HospitalKarachi 74800Pakistan Department of Radiology Rehman Medical InstitutePeshawar 25000Pakistan Army Liver Transplant Unit Pak Emirates Military HospitalRawalpindi 46000Pakistan Department of Gastroenterology Sindh Institute of Urology and TransplantationKarachi 75500Pakistan Rashid Nursing Home and Cancer Clinic Rashid Nursing Home and Cancer ClinicRawalpindi 46000Pakistan Department of Gastroentero

A consensus meeting of national experts from all major national hepatobiliary centres in the country was held on May 26,2023,at the Pakistan Kidney and Liver Institute&Research Centre(PKLI&RC)after initial consultations with the *** Pakistan Society for the Study of Liver Diseases(PSSLD)and PKLI&RC jointly organised this *** effort was based on a comprehensive literature review to establish national practice guidelines for hilar cholangiocarcinoma(hCCA).The consensus was that hCCA is a complex disease and requires a multidisciplinary team approach to best manage these *** coordinated effort can minimise delays and give patients a chance for curative treatment and effective *** diagnostic and staging workup includes high-quality computed tomography,magnetic resonance imaging,and magnetic resonance *** cytology or biopsy utilizing endoscopic retrograde cholangiopancreatography is a mainstay for ***,histopathologic confirmation is not always required before *** ultrasound with fine needle aspiration of regional lymph nodes and positron emission tomography scan are valuable adjuncts for *** only curative treatment is the surgical resection of the biliary tree based on the Bismuth-Corlette *** patients with unresectable hCCA can be considered for liver *** chemotherapy should be offered to patients with a high risk of *** use of preoperative biliary drainage and the need for portal vein embolisation should be based on local multidisciplinary *** with acute cholangitis can be drained with endoscopic or percutaneous biliary *** chemotherapy with cisplatin and gemcitabine has shown improved survival in patients with irresectable and recurrent hCCA.

关键词： Hilar cholangiocarcinoma Bismuth-Corlette classification Memorial Sloan Kettering Cancer Centre Staging Preoperative biliary drainage Portal vein embolisation Surgical resection Hepatectomy

Integrated ozone–photo–Fenton process for the removal of pollutant from industrial wastewater

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Chinese Journal of Chemical Engineering 2017年第4期25卷 516-522页

作者： P.Asaithambi Baharak Sajjadi abdul Raman abdul aziz Department of Chemical Engineering Faculty of EngineeringUniversity of Malaya50603Malaysia

The use of hybrid advanced oxidation processes(AOPs) for the removal of pollutants from industrial effluents has been extensively studied in recent literature. The aim of this study is to compare the performance of the photo,Fenton, photo-Fenton and ozone–photo–Fenton processes in terms of color removal and chemical oxygen demand(COD) removal of distillery industrial effluent together with the associated electrical energy per order. It was observed from the experimental results that the O_3/UV/Fe^(2 +)/H_2O_2 process yielded a 100% color and95.50% COD removals with electrical energy per order of 0.015 k W·h·m^(-3) compared to all other combinations of the AOPs. The effects of various operating parameters such as H_2O_2 and Fe^(2+) concentration, effluent pH, COD concentration and UV power on the removal of color, COD and electrical energy per order for the ozone–photo–Fenton process was critically studied and reported. The color and COD removals were analyzed using a UV/Vis spectrometer and closed reflux method.

关键词： Fenton photo ozone wastewater pollutant effluent AOPs hydroxyl inorganic irradiation

Elemental characterization of black shales of Khyber Pakthunkhawa (KPK) region of Pakistan using AAS

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Chinese Journal Of Geochemistry 2013年第3期32卷 248-251页

作者： abdul aziz Muhammad Sajjad Bashir Mohammad Central Analytical Facility Division Pakistan Institute of Nuclear Science and Technology Department of Construction Environment Engineering University of Science and Technology

Black shale samples were collected from Chimiari Khyber Pakthunkhawa region of Pakistan and were analyzed for elemental compositions. Atomic Absorption Spectrophotometry (AAS) was utilized for the determination of elements in the digested solutions. The analysis of black shale was performed precisely with relative standard deviation (RSD) lower than 2%. Results showed that the samples contained high concentrations of Ca (11.98 %), Al (7.09%), Fe (3.03%), Mg (0.59%) and Ti (0.58%).

关键词：原子吸收光谱法黑色页岩巴基斯坦元素组成表征相对标准偏差元素测定精确分析

Earthquake induced pounding between adjacent buildings considering soil-structure interaction

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Earthquake Engineering and Engineering Vibration 2012年第3期11卷 343-358页

作者： Sadegh Naserkhaki Farah N.A.abdul aziz Hassan Pourmohammad Department of Civil Engineering Faculty of EngineeringUniversiti Putra Malaysia Department of Civil Engineering Faculty of EngineeringIslamic Azad University

Many closely located adjacent buildings have suffered from pounding during past earthquakes because they vibrated out of phase. Furthermore, buildings are usually constructed on soil; hence, there are interactions between the buildings and the underlying soil that should also be considered. This paper examines both the interaction between adjacent buildings due to pounding and the interaction between the buildings through the soil as they affect the buildings＇ seismic responses. The developed model consists of adjacent shear buildings resting on a discrete soil model and a linear visco- elastic contact force model that connects the buildings during pounding. The seismic responses of＇ adjacent buildings due to ground accelerations are obtained for two conditions： fixed-based （FB） and structure-soil-structure interaction （SSSI）. The results indicate that pounding worsens the buildings＇ condition because their seismic responses are amplified after pounding. Moreover, the underlying soil negatively impacts the buildings＇ seismic responses during pounding because the ratio of their seismic response under SSSI conditions with pounding to those without pounding is greater than that of the FB condition.

关键词： adjacent buildings underlying soil pounding seismic response fixed-based (FB) structure-soil-structureinteraction (SSSI)

Synthesis,Characterization,Biological and Docking Simulations of 4-(Benzylideneamino) Benzoic Acids

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Chinese Journal of Structural Chemistry 2021年第3期40卷 291-300,271页

作者： HAMID aziz AAMER Saeed FARUKH Jabeen abdul Basit IRFAN Zia Qureshi abdul aziz ATIF Haroon ASHFAQ Ur Rehman Department of Chemistry Quaid-I-Azam University Islamabad 45320 Pakistan Computation ScienceResearch and Development Organization14012485 Hurontraio StreetMississaugaONCaL5A2G6 Department of Biology Laurentian University935 Ramsey Lake RoadSudburyONCanada P3E2C6 Department of Animal Sciences Quaid-I-Azam University Islamabad 45320 Pakistan Department of Microbiology Quaid-I-Azam University Islamabad 45320 Pakistan Department of Biochemistry Shankar CampusAbdul Wali Khan UniversityMardan 23200Khyber PukhtoonkhwaPakistan Department of Bioinformatics and Biostatistics Shanghai Jiaotong UniversityShanghai 200240China

The present research paper presents the synthesis, characterization, biological and computational studies of 4-(benzylideneamino) benzoic acid derivatives(3a~3g). Derivatives 3a~3c displayed best antidiabetic potential with a glucose-lowering effect compared to the reference drug Glibenclamide. Biochemical parameters including plasma glucose, serum triglycerides, cholesterol, alanine amino transferase and aspartate amino transferase levels showed significant alterations in concentrations relative to the control. Similarly, the derivatives 3a, 3d and 3e displayed potent in vitro antibacterial potential. Molecular docking simulations delineated that the ligands and complexes were stabilized at the active site by electrostatic and hydrophobic forces, consistent with the corresponding experimental results. In silico study of the binding pattern predicted that the synthesized ligands, 3d and 3a could serve as a potential surrogate for hit-to-lead generation and the design of novel antibacterial drugs.

关键词： antidiabetic biochemical cholesterol glibenclamide simulations