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Journal of Forestry Research 2020年第2期31卷 429-441页

作者： Arsalan Muhammad Faheem Siddiqui Moinuddin ahmed syed Shahid Shaukat Alamdar Hussain Department of Botany University of KarachiKarachi 75270Pakistan Dr.Moinuddin ahmed Laboratory of Plant Ecology and Dendrochronology Department of BotanyFederal Urdu UniversityKarachiPakistan Institute of Environmental Studies University of KarachiKarachiPakistan Department of Botany Karakoram International UniversityGilgitGilgit-BaltistanPakistan

This study focuses on age,growth rate and diameter distribution of pine forests in the Malam Jabba area,Swat District,*** core samples were taken from twenty *** smithiana was the oldest at 234 years with a 112-cm *** pindrow was 125 years with an 80-cm diameter while the oldest Pinus wallichiana was 122 years with 75-cm *** fastest overall growth rate of 1.5±0.1 year/cm was for *** on a west-facing aspect,while the slowest 5.8±2.6 year/cm growth was *** on an eastfacing *** and *** exhibited marked differences in growth rates over a 5-year *** highest growth was by *** from 1966 to *** showed less growth over the same years,such pattern simultaneously reverse from 1911 to *** relationship between diameter and age,diameter and growth rate and age and growth rate were *** and *** ages were correlated with diameter and growth *** age was positive correlated with ***,topographic and edaphic factors did not show significant correlations with growth rates,although some appreciable correlations were *** growth of *** was correlated with elevation while *** was correlated with maximum water retaining *** and age produced uneven size classes and many size gaps,which could be the result of anthropogenic disturbances.

关键词： Dendrochronology Environmental variables Conifer species Forest structure Age classes

Improvement in potassium ion batteries electrodes: Recent developments and efficient approaches

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Journal of Energy Chemistry 2021年第11期30卷 307-337,I0007页

作者： syed Musab ahmed Guoquan Suo Wei Alex Wang Kai Xi Saad Bin Iqbal School of Materials Science and Engineering Shaanxi University of Science and TechnologyXi’an 710021ShaanxiChina Beijing Key Laboratory of Bio-inspired Energy Materials and Devices School of Space and EnvironmentBeihang UniversityBeijing 100191China Cambridge Graphene Centre Department of EngineeringUniversity of CambridgeCambridge CB30FAUK Department of Chemical and Energy Engineering Faculty of Process and System EngineeringOtto-von-Guericke UniversitätMagdeburg 39106Germany

Demand for efficient and continuous application for high-grid energy storage systems involves the study towards novel battery technologies. Hence, considering the vast naturally available resources of potassium all over the world and its encouraging intercalation chemistries, it has recently enticed attention in electrochemical energy storage industry in the form of potassium ion batteries (PIBs). The major factor in this K+ based battery, is to develop efficient approaches to manufacture electrode substance to intercalate its big size potassium ions with considerable voltage, kinetics, charge/discharge capacity, capacity retention, cost, etc. This study contributes in the recent developments of anode and cathode materials for PIBs, including several electrode materials in regards to synthesis, structure, electrochemical performance, and K-storage mechanisms. Finally, the review contributes to provide helpful sources for the increasing number of scientists working in this industry regarding its critical issues and challenges and also to indicate the future direction of electrode materials in PIBs.

关键词： Potassium ion batteries Efficient approaches Recent developments

Burden of bone disease in chronic pancreatitis:A systematic review and meta-analysis

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World Journal of Gastroenterology 2023年第8期29卷 1374-1394页

作者： Ankit Chhoda Maria Jose Hernandez-Woodbine Nana Afua Akkya Addo syed Alishan Nasir Alyssa Grimshaw Craig Gunderson Awais ahmed Steven D.Freedman Sunil G.Sheth Department of Gastroenterology Beth Israel Deaconess Medical CenterBostonMA 02215United States Department of Medicine Norwalk HospitalYale School of MedicineNorwalkCT 06850United States Cushing/Whitney Medical Library Yale UniversityNew HavenCT 06510United States General Internal Medicine Yale School of MedicineNew HavenCT 06510United States

BACKGROUND Bone disease is an under-recognized cause of morbidity in chronic pancreatitis(CP).Over the past decade,publications of original studies on bone disease in CP has warranted synthesis of the evidence to ascertain the true burden of the *** To quantify the prevalence of osteopenia,osteoporosis,and fragility fractures in CP patients and investigate the associated clinical features and *** A systematic search identified studies investigating bone disease in CP patients from Cochrane Library,Embase,Google Scholar,Ovid Medline,PubMed,Scopus,and Web of Science,from inception until October *** outcomes included prevalence of osteopenia,osteoporosis,and fragility fractures,which were metaanalyzed using a random-effects model and underwent metaregression to delineate association with baseline clinical *** Twenty-one studies were included for systematic review and 18 studies were included for *** pooled prevalence of osteopenia and osteoporosis in CP patients was 41.2%(95%CI:35.2%-47.3%)and 20.9%(95%CI:14.9%-27.6%),*** pooled prevalence of fragility fractures described among CP was 5.9%(95%CI:3.9%-8.4%).Metaregression revealed significant association of pancreatic enzyme replacement therapy(PERT)use with prevalence of osteoporosis[coefficient:1.7(95%CI:0.6-2.8);P<0.0001].We observed no associations with mean age,sex distribution,body mass index,alcohol or smoking exposure,diabetes with prevalence of osteopenia,osteoporosis or fragility *** of data on systemic inflammation,CP severity,and bone mineralization parameters precluded a formal *** This meta-analysis confirms significant bone disease in patients with *** than PERT use,we observed no patient or study-specific factor to be significantly associated with CP-related bone *** studies are needed to identify confounders,at-risk population,and to understand the mechanisms of CP-related bone disease an

关键词： Chronic pancreatitis Fractures Osteoporosis Osteopenia Bone disease

石榴花多酚对离体大鼠胸主动脉环舒张作用的影响

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新疆医科大学学报 2018年第5期41卷 585-589页

作者：孙秀超买尔旦.玉苏甫张健鲁彦坤潘佳努尔威亚.努尔买买提陶威熔赛义德.谢卜利.艾哈迈德魏媛媛新疆医科大学基础医学院药理学教研室乌鲁木齐830011 新疆医科大学第一临床医学院乌鲁木齐830011 新疆医科大学国际教育学院乌鲁木齐830011 新疆医科大学基础医学院生理学教研室乌鲁木齐830011

目的研究石榴花多酚(Pomegranate Flower Polyphenol,PFP)对离体大鼠胸主动脉环舒缩功能的影响及作用机制。方法采用离体血管环灌流法观察(100~900)mg/L PFP对大鼠胸主动脉环张力的影响,给予钾通道阻断剂和一氧化氮合酶抑制剂N-硝基-L-... 详细信息

目的研究石榴花多酚(Pomegranate Flower Polyphenol,PFP)对离体大鼠胸主动脉环舒缩功能的影响及作用机制。方法采用离体血管环灌流法观察(100~900)mg/L PFP对大鼠胸主动脉环张力的影响,给予钾通道阻断剂和一氧化氮合酶抑制剂N-硝基-L-精氨酸甲酯(L-NAME),测定大鼠血管组织中所含一氧化氮的含量。结果当PFP浓度为(700~900)mg/L时,与内皮去除组比较,内皮完整组PFP对大鼠胸主动脉环舒张作用更强,差异有统计学意义(P<0.01)。钾通道阻断剂格列本脲(Glib,10μmol/L)、四乙基氯化铵(TEA,3mmol/L)、氯化钡(BaCl_2,100μmol/L)预处理均能抑制PFP对内皮去除大鼠胸主动脉环的舒张效应。PFP对无钙高钾液中Ca^(2+)收缩曲线和无钙液中PE引起的内钙释放均有抑制作用。一氧化氮合酶抑制剂L-NAME预处理对PFP诱导的内皮完整大鼠胸主动脉环舒张作用具有抑制作用。结论石榴花多酚具有内皮依赖性和内皮非依赖性2种舒张血管作用。

关键词：石榴花多酚血管舒张一氧化氮钾钙通道血管环

Performance analysis of a random ARQ initialized cooperative communication protocol in shadowed Nakagami-m wireless channel

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Science in China(Series F) 2009年第6期52卷 1027-1036页

作者： ahmed Irfan PENG MuGen WANG WenBo SHAH syed Ismail Wireless Signal Processing and Network Laboratory Beijing University of Posts and Telecommunications Real-Time MIMO Test-Bed Laboratory Iqra University Islamabad Pakistan

In this paper, we develop and analyze an energy efficient ARQ （automatic repeat request） initialized transmit diversity protocol for cooperative *** access control （MAC） layer packet retransmission limit （similar to aShortRetryLimit or aLongRetryLimit [802.11-1997]） has been used as an actuator for transmit cooperative diversity *** take the channel state information （CSI） as a function of retransmission tries and the number of retransmission tries is modeled as a random *** close to the source node are chosen for the transmit *** form expressions are obtained for symbol error rate （SER）, outage capacity and outage probability for the proposed scheme in shadowed fading *** cooperative scheme achieves lower signal-to-noise ratio （SNR）, stumpy outage probability, higher bandwidth, and transmit energy efficiencies for desired average symbol error rate （ASER） than the preceding ARQ based cooperative ***, the results of computer simulations are included to demonstrate the efficacy of the proposed scheme and to verify the accuracy of the analytical expressions.

关键词： automatic repeat request (ARQ) cooperative transmit diversity composite shadowed fading channel wireless networks

High surface area and mesoporous activated carbon from KOH-activated dragon fruit peels for methylene blue dye adsorption:Optimization and mechanism study

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Chinese Journal of Chemical Engineering 2021年第4期34卷 281-290页

作者： Ali H.Jawad ahmed Saud Abdulhameed Lee D.Wilson syed Shatir A.syed-Hassan Zeid A.ALOthman Mohammad Rizwan Khan Faculty of Applied Sciences Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia Department of Medical Instrumentation Engineering Al-Mansour University CollegeBaghdadIraq Department of Chemistry University of SaskatchewanSaskatoonSaskatchewan S7N 5C9 Canada Faculty of Chemical Engineering Universiti Teknologi MARA40450 Shah AlamSelangorMalaysia Chemistry Department College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

In this study,an alternative precursor for production of activated carbon was introduced using dragon fruit(Hylocereus costaricensis)peel(DFP).Moreover,KOH was used as a chemical activator in the thermal carbonization process to convert DFP into activated carbon(DFPAC).In order to accomplish this research,several approaches were employed to examine the elemental composition,surface properties,amorphous and crystalline nature,essential active group,and surface morphology of the *** BrunauerEmmettTeller test demonstrated a mesoporous structure of the DFPAC has a high surface area of 756.3 m2g *** cationic dye Methylene Blue(MB)was used as a probe to assess the efficiency of DFPAC towards the removal of MB dye from aqueous *** effects of adsorption input factors(*** dose(A:0.040.12 g L 1),pH(B:310),and temperature(C:3050℃))were investigated and optimized using statistical analysis(*** design(BBD)).The adsorption kinetic model can be best categorized as the pseudofirst order(PFO).Whereas,the adsorption isotherm model can be best described by Langmuir model,with maximum adsorption capacity of DFPAC for MB dye was 195.2 mg g 1 at 50℃.The adsorption mechanism of MB by DFPAC surface was attributed to the electrostatic interaction,pp interaction,and ***,the results support the ability of DFP to be a promising precursor for production of highly porous activated carbon suitable for removal of cationic dyes(***).

关键词： Statistical modeling Activated carbon Dragon fruit peels Box-Behnken design Methylene blue dye Adsorption

A conformable mathematical model for alcohol consumption in Spain

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International Journal of Biomathematics 2019年第5期12卷 203-219页

作者： Aqsa Nazir Naveed ahmed Umar Khan syed Tauseef Mohyud-Din Pepartment of Mathefnaticst Faculty of HITEC University Taxila CanttPakistan Department of Mathematics and Statistics Hazara University MansehruPakistan

A study on the conformable model of alcohol consumption in Spain has been *** the proposed model,the existence as well as the uniqueness of the solution has been discussed with the help of fixed-point *** analytical technique,Variational Iteration Method (VIM),has been used to obtain the solution to the governing system of differential *** the help of suitable plots,the role of fractional order derivative has been *** decreasing values of fractional order derivative,decrease in the number of non-consumers and non-risk consumers has been *** increasing the value of fractional order derivative,a sharp decrease can be seen in the compartment of *** agreement between the current study and the already existing studies,with ordinary derivatives,has also been pointed out.

关键词： Alcohol consumption nonlinear differential equations initial value problem conformable derivative uniqueness fixed-point postulate VIM

Syzygium aromaticum ethanol extract reduces AlCl_3-induced neurotoxicity in mice brain through regulation of amyloid precursor protein and oxidative stress gene expression

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Asian Pacific Journal of Tropical Medicine 2018年第2期11卷 123-130页

作者： Sanila Amber syed Adnan Ali Shah Touqeer ahmed Saadia Zahid Neurobiology Research Laboratory Department of Healthcare BiotechnologyAtta-ur-Rahman School of Applied BiosciencesNational University of Sciences and Technology Atta-ur-Rahman Institute for Natural Product Discovery (AuRIns)Universiti Teknologi MARA Puncak Alam Campus Faculty of Pharmacy Universiti Teknologi MARA Puncak Alam Campus

Objective: To investigate the neuroprotective effects of Syzygium aromaticum(***)extract(500 mg/kg) on AlCl_3(300 mg/kg)-induced mouse model of oxidative stress and ***: An ethanolic extract of *** seeds was prepared and the active compounds were identified using nuclear magnetic resonance ***/c mice were divided into five groups(negative control, AlCl_3-treated, self-recovery, AlCl_3 + ***, *** only; n=10) and treated with AlCl_3 and *** *** of oxidative markers [Superoxide dismutase 1(SOD1) and peroxiredoxin 6(Prdx6)] and amyloid precursor protein(APP) in the hippocampus and cortex was evaluated via *** assessment was performed to investigate the extent of ***: It was observed that AlCl_3 exposure increased the expression of APP770 while simultaneously down regulated the expression of ***_3 also induced a significant decrease(P<0.05) and an increase(P<0.05) in the expression level of SOD1 and Prdx6, respectively.A substantial decrease substantial(P<0.05) in the density of Nissl substance was also observed in cortex of the mice treated with AlCl_***, treatment with *** extract normalized the alterations in the expression level of SOD1, Prdx6 and APPisoforms and improved the neuronal structural ***: The results showed that *** is a promising antioxidant and a neuroprotective agent.

关键词： Amyloid precursor protein Oxidative stress Aluminum Neurodegeneration

Lean HC gas injection pilots analysis and IPR back calculation to examine the impact of asphaltene deposition on flow performance

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Petroleum Research 2019年第1期4卷 84-95页

作者： Fahad I.syed Mohamed Boukhatem ahmed A.Al Kiyoumi Abu Dhabi National Oil Company(ADNOC)Offshore Abu DhabiUnited Arab Emirates

Gas injection is one of the most economical and effective approach to improve oil ***,outcome of such approach is contingent to reservoir heterogeneities impacting gas override and ***,injected fluid composition and its compatibility with the reservoir fluid potentially impact flow assurance issues such as asphaltene precipitation into the wellbore and surface *** objective of this paper is to examine the lesson learnt from a couple of field scale 5 spot patterned lean hydrocarbon gas injection pilots which were deployed in a heterogeneous carbonate formation of a giant field located offshore Abu Dhabi under secondary and tertiary drive *** pilots provides a valuable insight on production performance,pressure support,gravity override,fluid composition and evidence of asphaltene deposition that resulted in heavy production loss prior to the solvent *** paper presents the overall pilot performance including pattern recovery,fluid front movement,potential role of heterogeneity in gas breakthrough timings and the operational events to witness asphaltene deposition affecting the flow *** deposited asphaltene cake thickness was measured mechanically during routine tubing clearance check operation that was helpful in estimating production loss due to altered production tubing flow *** an integrated approach is applied to confirm the AOP laboratory measurements with the actual deposits of asphaltene that were found in to the production *** order to confirm the effect of asphaltene deposition on inflow from near wellbore formation to the wellbore,a straightforward yet innovative nodal analysis approach was applied to study well performance using the calibrated and history matched well *** was noticed that not only the outflow was altered because of asphaltene deposition into wellbore but also the inflow(productivity index)was seriously impacted potentially due to asphaltene depos

关键词： Gas injection Well performance Asphaltene deposition Formation damage

Overlap of diabetic ketoacidosis and hyperosmolar hyperglycemic state

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World Journal of Clinical Cases 2022年第32期10卷 11702-11711页

作者： Esraa Mamdouh Hassan Hisham Mushtaq Esraa Elaraby Mahmoud Sherley Chhibber Shoaib Saleem ahmed Issa Jain Nitesh Abbas B Jama Anwar Khedr Sydney Boike Mikael Mir Noura Attallah Salim Surani syed A Khan Critical Care Medicine Mayo Clinic Health SystemMankatoMN 56001United States Medicine St.Vincent's Medical CenterBridgeportCT 06606United States Medicine College of MedicineUniversity of SharjahSharjah 27272United Arab Emirates Medicine Mercy Catholic Medical CenterDarbyPA 19025United States Medicine Mayo HospitalLahore 54000PunjabPakistan Medicine Medical University of the AmericasNevisWest Indies Medicine BronxCare Health SystemBronxNY 10457United States Medicine University of Minnesota Medical SchoolMinneapolisMN 55455United States Medicine&Pharmacology Texas A&M University Health Science CenterCollege StationTX 77843United States Anesthesiolgy Mayo ClinicRochesterMN 55905United States

Diabetic ketoacidosis(DKA)and hyperosmolar hyperglycemia state(HHS)are two life-threatening metabolic complications of diabetes that significantly increase mortality and *** major advances,reaching a uniform consensus regarding the diagnostic criteria and treatment of both conditions has been challenging.A significant overlap between these two extremes of the hyperglycemic crisis spectrum poses an additional *** has well been noted that a complete biochemical and clinical patient evaluation with timely diagnosis and treatment is vital for symptom ***,there is a lack of large-scale studies that help define how hyperglycemic crises should be *** article will provide a comprehensive review of the pathophysiology,diagnosis,and management of DKA-HHS overlap.

关键词： Diabetic ketoacidosis Hyperosmolar Coma Diabetes Metabolic acidosis Hypernatremia Hyperosmolar hyperglycemia state