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Effect　of　Ballistic-Type　Hot　Atom　Adsorption　mechanism　on　the　Phase　Diagram　of　monomer　Dimer　CO-O2　Surface　Catalytic　Reaction：　A　monte　Carlo　Simulation

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Chinese Physics Letters 2004年第6期21卷 1171-1174页

作者： m.khalid K.m.khan A.U.Qaisrani Q.N.malik DepartmentofPhysics GomalUniversityDeraIsmailKhanPakistan NuclearPhysicsDivision PakistanInstituteofNuclearScienceandTechnology(PINSTECH)P.O.NiloreIslamabadPakistan

We investigate the effect of the ballistic mechanism on the phase diagram using a square surface. While using this mechanism whenever an O2 molecule hits a randomly vacant selected site, the molecule breaks up into atomic form and then executes a ballistic flight. The paths of the two oxygen atoms are taken exactly to be opposite to each other, ***-parallel, and the ranges of the atoms are taken to be equal, *** may fly up to 1 or 1.414 or 2 of the atomic spacing from the site of impact. Four cases have been studied on the basis of the range of hot atoms. The range of the hot oxygen atoms executing a ballistic flight might be up to the first nearest neighbourhood (1 atomic spacing from the site of impact), the second nearest neighbourhood (1.414 atomic spacing from the site of impact), the third nearest neighbourhood (2 atomic spacing from the site of impact), known as cases a, b, and c, respectively, while for case d the range of the oxygen atoms executing the ballistic flight might be up to 1 atomic spacing or 1.414 atomic spacing or 2 atomic spacing from the site of impact. The steady reactive window is observed and the continuous transition disappears. As soon as the CO partial pressure departs from zero, the production of CO2 is observed, which clearly verifies the experimental observation.

关键词： Oxygen

Dosage and utilization of dexamethasone in the management of COVID-19: A critical review

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World Journal of Virology 2024年第3期13卷 107-114页

作者： Imran Sethi Asim Shaikh musa Sethi Hira khalid Chohan Sheraz Younus Syed A khan Salim Surani Department of Critical Care medicine Marion General HospitalMarionIN 46952United States Department of medicine Aga Khan UniversityKarachi 74200SindhPakistan Department of medicine Eman SchoolFishersIN 46038United States Department of Internal medicine Dow University of Health ScienceKarachi 74200SindhPakistan Department of Hospital medicine Franciscan HealthIndianapolisIN 46237United States Department of Critical Care medicine Mayo Clinic Health SystemMankatoMN 56001United States Department of medicine and Pharmacology Texas A and M UniversityCollege StationTX 77843United States

BACKGROUND The severe respiratory manifestations observed in severe coronavirus disease 2019(COVID-19)cases are often associated with an excessive inflammatory ***,a synthetic glucocorticoid,exerts its anti-inflammatory effects by inhibiting the transcription of pro-inflammatory genes and suppressing the activity of various immune *** mechanism has implications for mitigating the cytokine storm observed in severe COVID-19 *** on in the pandemic,the Recovery Collaborative working group showed a mortality benefit of using dexamethasone in decreasing mortality in patients with COVID-19 requiring respiratory ***,the optimal dosage of corticosteroids remains *** studies that compare different doses of dexamethasone in COVID-19 exist,but the results are *** To review the latest evidence regarding dosage,safety,and efficacy of dexamethasone in severe *** We followed preferred reporting items for systematic reviews and meta-analysis guidelines.A detailed literature search was conducted across Pubmed,Google Scholar,and medline to include publications up to march *** keywords included“COVID-19”“SARS-CoV-2”“dexamethasone”“corticosteroid”“steroid”and“glucocorticoid”-along with their *** employed the Cochrane Risk of Bias Tool and the Newcastle-Ottawa scale to evaluate the integrity and potential of bias in the included studies.A meta-analysis was conducted using a random-effects model,assessing pooled odds ratios and mean differences,with heterogeneity gauged by the I2 statistic and theχ^(2) *** No statistical differences were found in 28-day all-cause mortality[pooled odds ratio(OR)=1.109,95%CI:0.918-1.340],60-day all-cause mortality(OR=0.873,95%CI:0.744-1.024;I2=47.29%),mean length of hospital stay(mean difference=-0.08 days,95%CI:-0.001 to 0.161)and adverse events(OR=0.877,95%CI:0.707-1.087).CONCLUSION Differing doses of corticosteroids have no clinical implication

关键词： COVID-19 Steroids Corticosteroids Steroid dosage Critical care Corona virus

Phase Diagram Body-Centredof Catalytic Oxidation of CO on the Surface-Subsurface of a Body-Centred Cubic Structure with Eley-Rideal Process： A monte Carlo Simulation

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Chinese Physics Letters 2004年第9期21卷 1838-1841页

作者： AU.Qaisrani m.khalid musaKaleemBalocht DepartmentofPhysics GomalUniversityD.I.KhanPakistan DepartmentofChemistry GomalUniversityD.I.KhanPakistan

monte Carlo simulation is used to explore the effects of the Eley-Rideal (ER) process on the phase diagram of the Langmuir–Hinshelwood (LH) type monomer–dimer (CO–O2) catalytic reaction on the surface and subsurface of a body-centred cubic structure, which extends to only two layers in the z-direction. The dimer (O2) is adsorbed in such a way that it takes one surface site whereas the second site is from the subsurface. For this mechanism, an interesting situation develops. The production rate of CO2 is found to be consistent with experiment. The qualitative trend of the surface oxygen coverage is not consistent with the experimental situation in one model while it is found to be consistent with that in another model, i.e. the coverage of surface oxygen decreases slowly with increase of concentration of CO (yCO). moreover, the production of CO2 can be predicted in the form of a mathematical relation.

关键词： Phase diagrams

Analysis of cerium substitution in Co-Sr based spinel ferrites for high frequency application

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Journal of Rare Earths 2024年第9期42卷 1755-1763,I0005页

作者： Laura Khudaysh Inas A.Ahmed Syeda Rabia Ejaz Sajjad Ahmad khan Yasir A.Haleem mohamed m.Ibrahim mahmood Ali Hafiz muhammad Tahir Farid Zeinhom m.El-Bahy Department of Physics Faculty of ScienceJazan UniversityJazan45142Saudi Arabia Department of Chemistry Faculty of ScienceKing Khalid UniversityAbha62224Saudi Arabia Department of Physics The Government Sadiq College Women UniversityBahawalpur63100Pakistan Institute of Physics Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan64200Pakistan Department of Chemistry College of ScienceTaif UniversityP.O.Box 11099Taif21944Saudi Arabia Centre of Excellence in Solid State Physics University of the PunjabLahorePakistan Department of Physics Government CollegeTaunsa Sharif32200Pakistan Department of Chemistry Faculty of ScienceAl-Azhar UniversityNasr City11884CairoEgypt

Spinel ferrites exhibit exceptional magnetic properties,making them a distinctive class of magnetic *** sol-gel technique was utilized for the synthesis of spinel ferrites with the chemical formula Co_(0.6)Sr_(0.4)Ce_(x)Fe_(2-x)O_(4). Following that,a comprehensive X-ray diffraction analysis unveiled the crystalline cubic structure of the synthesized *** the utilization of the m-H loop approach,the ferromagnetic attributes of ferrites were assessed,and the assimilation of rare earth elements led to substantial enhancements in saturation magnetization,remanence,and *** ferrites with a high concentration of rare earth elements have improved direct current resistivity and activation *** logarithm of a material's resistance increased from 5.29 to 8.12 Ω·cm as cerium is *** a change in the amount of cerium,the activation energy goes up from 0.19 to *** changing the frequency from 5.5 to 9.5 GHz,the dielectric characteristics were *** the frequency goes up,the dielectric constant goes *** ferrites that have been made better in every way can be used in high-frequency applications.

关键词： Activation energy DC electrical resistance Remanence magnetization Cobalt strontium spinel ferrites High frequency application Rare earths

Seed Priming with Potassium Nitrate Can Enhance Salt Stress Tolerance in maize

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Phyton-International Journal of Experimental Botany 2024年第8期93卷 1819-1838页

作者： Bushra Rehman Asma Zulfiqar Houneida Attia Rehana Sardar muneera A.Saleh khalid H.Alamer Ibtisam m.Alsudays Faisal mehmood Qamar uz Zaman Institute of Botany University of the PunjabLahore54590Pakistan Department of Biology College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Botany Emerson UniversityMultan60000Pakistan Biological Sciences Department Faculty of Science and ArtsKing Abdulaziz UniversityRabigh21911Saudi Arabia Department of Biology College of ScienceQassim UniversityBurydah52571Saudi Arabia Department of Chemistry Sciences The University of LahoreLahore54590Pakistan Department of Environmental Sciences The University of LahoreLahore54590Pakistan

Salinity is a major abiotic stress that hinders plant development and productivity and influences agricultural *** priming is a technique used to boost germination and seedling growth under abiotic stress.A pot experiment was conducted to evaluate the impact of seed priming with potassium nitrate(KNO_(3))at various levels(0%,0.50%,1.00%and 1.50%)under salt stress(0,75,100 mm NaCl)on two maize verities(mNH360 and 30T60)for the growth,development and metabolic attributes results revealed that in maize variety mNH360,KNO_(3)priming’s significantly enhanced growth parameters than in maize variety 30T60 under control and salt-stressed *** with KNO_(3)enhanced carotenoids and total chlorophyll in the 30T60 variety that protected the maize plants from salt ***,it was shown that priming with 1.00%KNO_(3)acts as safeguarded to protect them from oxidative damage by salt stress minimizing reactive oxygen species(ROS)formation through increased levels of malondialdehyde(mDA),catalase(CAT),peroxidase(POD),ascorbate peroxidase(APX),and total soluble *** findings of the present study confirm that the use of the KNO_(3)seed priming technique is a lowcost,environmentally friendly technique for mitigating adverse impacts of salt stress in maize crops by activating the antioxidant defense system and improving chlorophyll and osmolyte contents.

关键词： Salinity Zea mays antioxidant enzymes growth seedlings oxidative damage

Non-Thermal Effects on CO-NO Surface Catalytic Reaction on Square Surface： monte Carlo Study

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Chinese Physics Letters 2005年第6期22卷 1533-1535页

作者： m.khalid A.U.Qaisrani W.Ahmad DepartmentofPhysics GomalUniversityDeraIsmailKhanPakistan PhysicsResearchDivision PakistanInstituteofNuclearScienceandTechnologyPONiloreIslamabadPakistan

A monte Carlo simulation of the CO–NO heterogeneous catalytic reaction over a square surface has already been studied with a model based on the Langmuir–Hinshelwood (LH) mechanism. The results of this study are well known. Here we study the effects of transient non-thermal mobility of monomer (CO) based on precursor mechanism, diffusion of adsorbed nitrogen and oxygen atoms, on the phase diagram. The interesting feature of this model is the yield of a steady reactive window, while simple LH mechanism is not capable of producing a steady reactive state.

关键词： FOPT SOPT CO ZGB

Endoscopic push through tragal cartilage tympanoplasty: A 10-year retrospective review of our technique and outcomes

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World Journal of Otorhinolaryngology 2024年第2期11卷 18-24页

作者： K m Abidur Rahman khalid majeed Emma Finnegan Ivan Keogh Ear Noseand Throat/Head and Neck SurgeryGalway University HospitalGalway H91 YR71Ireland Academic Department of Otorhinolaryngology and Head and Neck Surgery University of GalwayGalway H91 TK33Ireland

BACKGROUND Endoscopic ear surgery(EES)provides a magnified,high-definition view of the otological surgical *** allows otologists to avoid surgical incisions and associated postoperative *** is an ideal technique for the perfor-mance and teaching of *** To examine the efficacy of total Endoscopic Push Through Tragal Cartilage Tympanoplasty(EPTTCT),at our institution over a 10-year *** A retrospective analysis of 168 cases of EPTTCT for closure of small to medium tympanic membrane perforations from 2013-2023 was *** sex,age range(pediatric vs adult),etiology of injury,success rate,complications,and postoperative hearing status were *** Graft uptake results indicated success in 94%of patients,with less than a 2%complication *** pure tone audiometry demonstrated hearing status improvement in 69%of *** EPTTCT has been shown to be effective in tympanic membrane perforation closures with minimal *** study further demonstrates the efficacy and safety of these procedures in a single-center review.

关键词： Total endoscopic ear surgery Otology Tympanoplasty Hearing Perforation Tragal cartilage graft

Neglected congenital bilateral knee dislocation treated by quadricepsplasty with semitendinosus and sartorius transfer:A case report

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World Journal of Orthopedics 2024年第8期15卷 807-812页

作者： Osama m Qasim Abdulaziz A Abdulaziz Nibras K Aljabri khalid S Albaqami Rayan m Suqaty College of medicine Umm Al-Qura UniversityMecca 21955Makkah al MukarramahSaudi Arabia Department of Orthopedic King Faisal Medical Complex TaifTaif 26514TaifSaudi Arabia Department of Orthopedic Alnoor Specialist HospitalMecca 24241Makkah al MukarramahSaudi Arabia

BACKGROUND Congenital knee dislocation(CKD)is a rare condition,which accounts for 1%of congenital hip *** can present as an isolated condition or coexist with other genetic *** options include serial casting,percutaneous quadriceps recession,and V-Y quadricepsplasty(VYQ).The pathogenesis and hereditary patterns of CKD are not fully understood,with most cases being *** is usually managed immediately after ***,in this report,the patient was neglected for 2 *** SUmmARY A 2-year-old girl with bilateral CKD after birth presented to our hospital after failed serial casting;the patient had seizures and limited access to healthcare because of her family’s low socioeconomic *** birth was noted for a breech presentation accompanied by *** delivery took a long time,requiring immediate medical *** an infant,she had chronic diseases,including a small patent ductus arteriole,multicystic dysplastic kidney disease,and *** was found to have a bilateral knee dislocation of approximately-90°on hyperextension.A multidisciplinary team was involved,and medical care was *** underwent VYQ plus semitendinosus and sartorius *** four postoperative follow-ups,her knees were regaining mobility,and she could walk for 2-3 steps without *** This report highlights the importance of early intervention and recommends extensive studies of the management in similar cases.

关键词： Knee dislocation Congenital knee dislocation V-Y quadricepsplasty Neglect Neglected knee dislocation Pediatric orthopedics Case report

Burden of routine orthopedic implant removal a single center retrospective study

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World Journal of Orthopedics 2024年第2期15卷 139-146页

作者： Ammar K AlOmran Nader Alosaimi Ahmed A Alshaikhi Omar m Bakhurji khalid J Alzahrani Basil Ziyad Salloot Tamim Omar Alabduladhem Ahmed I Almulhim Arwa Alumran Department of Orthopedic College of MedicineImam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia Health Information management and Technology Department Imam Abdulrahman Bin Faisal UniversityDammam 31441Saudi Arabia

BACKGROUND Open reduction and internal fixation represent prevalent orthopedic procedures,sparking ongoing discourse over whether to retain or remove asymptomatic *** consensus on this matter is paramount for orthopedic *** study aims to quantify the impact of routine implant removal on patients and healthcare facilities.A retrospective analysis of implant removal cases from 2016 to 2022 at King Fahad Hospital of the University(KFHU)was conducted and subjected to statistical *** these cases,44%necessitated hospitalization exceeding one day,while 56%required only a single *** exhibited a 55%need for extended hospital stays,contrasting with 22.8%among the pediatric *** complication rate was 6%,with all patients experiencing at least one ***,34.1%required sick leave and 4.8%exceeded 14 *** anesthesia was predominant(88%).Routine implant removal introduces unwarranted complications,particularly in adults,potentially prolonging *** procedure strains hospital resources,tying up the operating room that could otherwise accommodate critical *** defined institutional guidelines are imperative to regulate this *** To measure the burden of routine implant removal on the patients and *** This is a retrospective analysis study of 167 routine implant removal cases treated at KFHU,a tertiary hospital in Saudi *** were collected in the orthopedic department at KFHU from February 2016 to August 2022,which includes routine asymptomatic implant removal cases across all age *** indications such as infection,pain,implant failure,malunion,nonunion,restricted range of motion,and prominent hardware were *** who had external fixators removed or joints replaced were also *** Between February 2016 and August 2022,360 implants were retrieved;however,only 167 of those who met the inclusion criteria were included in this

关键词： Implant removal Healed fracture Orthopedic implant Complications Healthcare system