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UAV Lateral Path Following: Nonlinear Sliding manifold for Limited Actuation

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UAV Lateral Path Following: Nonlinear Sliding Manifold for L...

第36届中国控制会议

作者： Syed Ussama Ali Raza Samar m.zamurad shah Center of Excellence in Science and Applied Technologies (CESAT)

ISBN: (纸本)9781538629185

The lateral guidance objective is to derive the cross track error towards zero with graceful and stable maneuvers and then to keep it as minimum as possible. A nonlinear sliding surface based lateral guidance scheme is proposed here for Unmanned Aerial Vehicles(UAVs) application with limited actuation. Following the inner(control) and outer(guidance)loop structure, the proposed guidance scheme resides in outer loop and generates reference bank angle commands for the inner control loop. The proposed 1 order SmC algorithm based on nonlinear sliding surface is derived using the kinematic equations for bank-to-turn vehicles. mathematical proof of existence of sliding mode and actuation boundedness of the closed-loop is also provided. The proposed guidance and control system performance is verified via simulation results for different scenario. A high fidelity nonlinear 6-degrees-offreedom(6-dof) scaled Yak-54 UAV mathematical model is used for flight simulations. Simulation results validated the effectiveness and performance of the proposed lateral guidance scheme.

关键词： Stability analysis Unmanned aerial vehicles manifolds Actuators mathematical model Sliding mode control Robustness

Adaptive Sliding mode Roll Control of a Canard-Controlled missile

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Adaptive Sliding Mode Roll Control of a Canard-Controlled Mi...

2010 Chinese Control and Decision Conference

作者： m.zamurad shah Raza Samar A.I.Bhatti mohammad Ali Jinnah University IslamabadPakistan

This work is meant to design a roll controller for a short range missile with a free-spinning tail using the sliding mode control *** canards located near the nose of the missile provide aerodynamic ***/yaw stability is achieved through four rotating fins located at the tail of the *** of the missile dictates the whole trajectory in the atmosphere where dynamic pressure varies between 0 and 7 *** the missile can be fired at different launch angles,which implies that the profile of dynamic pressure is not *** strategy strongly depends on dynamic pressure in the case of canard-controlled *** the case of varying dynamic pressure,design of a robust roll controller that can keep roll angle near zero is a challenging *** this paper,a roll controller is designed for a canard-controlled short range missile using sliding mode control *** is done in some control parameters to cater the variation in dynamic pressure and different launch *** robustness of the roll controller is tested in the presence of aerodynamic and other *** is established that the proposed roll controller is capable of rejecting aerodynamic and other disturbances and keep the roll angle close to zero.

关键词： missile sliding mode control adaptive control autopilot aerodynamics canards.

Robust Nonlinear Control Design For Scaled Yak-54 Unmanned Aerial Vehicle

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Robust Nonlinear Control Design For Scaled Yak-54 Unmanned A...

第26届中国控制与决策会议

作者： Ussama Ali m.zamurad shah Aamer Iqbal Bhatti Raza Samar Faculty of Electronic Engineering Mohammed Ali Jinnah University

In this work, the authors consider the applications of sliding mode controllers to the longitudinal flight dynamics of the benchmark system of scaled Yak-54 Unmanned Aerial Vehicle for executing maneuvers over full flight *** of unmanned aerial vehicle involves the problem of incomplete measurements, modeling uncertainties and external disturbances. Sliding mode control provides good precision and robustness to the aforementioned factors. First order sliding mode controller are designed but they provide chattering at the control input thus a non linear second order super twisting controller is used to provide chattering free control with improved performance for the robust stabilization of pitch angle and control of its altitude. The simulation results indicate good tracking and regulation control of the vehicle.

关键词： Sliding mode Control SmC Higher Order Sliding mode Control HOSm Strong Reachability Condition SRC

C-phycocyanin shows neuroprotective effect against rotenone-induced Parkinson’s disease in mice

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Asian Pacific Journal of Tropical Biomedicine 2024年第7期14卷 279-287页

作者： Hritik Rathod Ritu m.Soni Jigna S.shah Department of Pharmacology Institute of Pharmacy Nirma UniversityAhmedabadGujaratIndia

Objective:To investigate the neuroprotective effect of C-phycocyanin in a mouse model of rotenone-induced Parkinson’s ***:C-phycocyanin(50 mg/kg,i.p.,daily)was administered to rotenone(30 mg/kg,p.o.,daily)treated mice for 28 *** studies(Y-maze,rotarod,round beam walk,and wire-hang tests)were carried out to assess neurobehavioral *** and malondialdehyde were determined in both serum and striatal *** proteins(AKT,AmPK,NF-κB,BDNF,and alpha-synuclein)in the striatum were estimated using *** analyses(hematoxylin and eosin stainning as well as Nissl staining)were carried out to assess structural abnormalities in the ***:C-phycocyanin significantly increased BDNF levels and decreased alpha-synuclein *** also slightly upregulated AmPK and AKT levels without significant difference compared with the rotenone ***,rotenone-induced elevated oxidative stress and structural abnormalities in the striatum were markedly mitigated by ***:C-phycocyanin might have potential neuroprotective effects against Parkinson’s *** studies are warranted to verify its efficacy and to understand the molecular mechanisms behind the neuroprotective effects of C-phycocyanin in Parkinson’s disease.

关键词： Parkinson’s disease C-phycocyanin Alphasynuclein BDNF Oxidative stress Rotenone

Antimicrobial stewardship and targeted therapies in the changing landscape of maternal sepsis

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Journal of Intensive medicine 2024年第1期4卷 46-61页

作者： Nishel m shah Esmita Charani Damien ming Fook-Choe Cheah mark R Johnson Department of metabolism Digestion and ReproductionImperial College LondonChelsea and Westminster HospitalLondonUK Health Protection Research Unit in Healthcare Associated Infection and Antimicrobial Resistance Imperial College LondonLondonUK Division of Infectious Diseases and HIV medicine Department of MedicineGroote Schuur HospitalUniversity of Cape TownCape TownSouth Africa Department of Infectious Diseases Imperial College LondonChelsea and Westminster HospitalLondonUK Department of Paediatrics Faculty of MedicineUniversiti Kebangsaan Malaysia Medical CentreKuala LumpurMalaysia

Pregnant and postnatal women are a high-risk population particularly prone to rapid progression to sepsis with significant morbidity and mortality ***,severe maternal infections can have a serious detrimental impact on neonates with almost 1 million neonatal deaths annually attributed to maternal infection or *** this review we discuss the susceptibility of pregnant women and their specific physiological and immunological adaptations that contribute to their vulnerability to sepsis,the implications for the neonate,as well as the issues with antimicrobial stewardship and the challenges this poses when attempting to reach a balance between clinical care and urgent ***,we review advancements in the development of pregnancy-specific diagnostic and therapeutic approaches and how these can be used to optimize the care of pregnant women and neonates.

关键词： Sepsis Pregnancy Immunology Cardiovascular Personalised medicine Antibiotic stewardship

Twinning aspects and their efficient roles in wrought mg alloys:A comprehensive review

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Journal of magnesium and Alloys 2024年第6期12卷 2201-2230页

作者： S.S.A.shah manping Liu Azim Khan Farooq Ahmad m.R.Abdullah Xingquan Zhang Shiwei Xu Zhen Peng School of materials Science and Engineering Jiangsu UniversityZhenjiang 212013China School of mechanical Engineering Anhui University of TechnologyMáanshan 243002China College of mechanical and Vehicle Engineering Hunan UniversityChangsha 410082China

Twinning is widely recognized as an effective and cost-efficient method for controlling the microstructure and properties of wrought magnesium(mg)***,twins play a crucial role in initiating dynamic recrystallization(DRX),while twin regions experience rapid recrystallization during static recrystallization(SRX).The activation of twinning can lead to changes in lattice orientation,significantly impacting the final texture in mg *** active roles of twinning are influenced by various factors during the activation process,and the mobility of twin boundaries(TB)can be amplified by stress effects,dislocation interactions,and thermal ***,annealing treatments that involve proper segregation or precipitation on TBs serve to stabilize them,restraining their *** such as segregation may also alter the twinning propensity in magnesium-rare earth(mg-RE)***{10-11}contraction twins(CT)and{10-11}-{10-12}double twins(DT)can promote dynamic recrystallization(DRX),they also pose a risk as potential sources of voids and ***,understanding the nucleation and growth mechanisms of twinning is crucial,and these aspects are briefly reviewed in this *** the factors mentioned above,this article summarizes the recent research progress in this field,shedding light on advancements in recent eras.©2024 Chongqing *** services provided by Elsevier *** behalf of KeAi Communications ***.

关键词： mg alloys Twinning Recrystallization Texture mechanical properties

Ir single atoms on NiFeZn-LDH matrix for exceptional oxygen evolution reaction

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Nano Research 2024年第8期17卷 7039-7044页

作者： muhammad Israr muhammad Humayun Jiaqi Zhang Khadim shah Xin Tan Chen Chen Yadong Li Department of Chemistry Tsinghua UniversityBeijing 100084China Energy Water and Environment LabCollege of Humanities and SciencePrince Sultan UniversityRiyadh11586Saudi Arabia

To address the sluggish kinetics of the oxygen evolution reaction(OER),a potential approach is to rationally design and fabricate extremely effective single atom catalysts(SACs).Using an appropriate matrix to stabilize single-atom active centers with optimal geometric and electronic structures is crucial for enhancing catalytic ***,we report the design and fabrication of Ir single atoms on NiFeZn layered double hydroxide(Ir-SAC/NiFeZn-LDH)electrocatalyst for highly efficient and stable *** is investigated that the NiFeZn support exhibits abundant defect sites and unsaturated coordination *** sites function to anchor and stabilize single Ir single atoms on the *** strong synergetic electronic interaction between the Ir single atoms and the NiFeZn matrix resulted in remarkable OER performance of the as-fabricated Ir-SAC/NiFeZn *** a loading Ir content of 1.09 wt.%,this catalyst demonstrates a highly stable OER activity,with an overpotential of 196 mV at 10 mA·cm^(−2) and a small Tafel slope of 35 mV·dec^(−1) for the OER in a 1 m KOH *** results significantly surpass the performance of the commercially available IrO_(2) catalyst.

关键词： Ir single atoms layered double hydroxides rational design geometric optimization oxygen evolution reaction

An arrow in the quiver: evaluating the performance of Hyptis suaveolens(L.) Poit. in different light levels

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Ecological Processes 2024年第2期 130-147页

作者： Kanhaiya shah Gyan Prakash Sharma R.Sagar Department of Environmental Studies University of Delhi Department of Botany Banaras Hindu University

Background Hyptis suaveolens（L.） Poit.,native to the American tropics,is a pantropical annual plant and a major invasive species throughout *** was anticipated that the availability of sunlight,coupled with its superior reproductive potential,persistent propagule bank,and dispersal ability,could lead to an increase in the growth and spread of this invader,thus potentially impeding herbaceous growth and diversity in non-native *** its ecological fitness and competitive performance will be useful to manage the spread of *** in natural ecosystems that are facing a wide range of anthropogenic *** The present study is a three-tier *** the first tier,a field study was conducted to assess the patterns of *** abundance and herbaceous species diversity in response to light availability(sun,842-1072μmol m-2s-1and shade 253-341 μmol m-2S-1) in the tropical dry deciduous ecosystems in the Vindhyan highlands,***,the impact of *** abundance on the resident native and non-native species abundance and diversity was also *** the second tier,a randomized common garden experiment was conducted to understand the trait fitness of *** in sun(940 μmol m-2s-1) and shade(300 μmol m-2s-1) *** the third tier,a plant growth chamber experiment with high-light(940 μmol m-2s-1) and low-light(300 μmol m-2s-1)treatments was done to learn how *** partitions its biomass between aboveground and belowground plant *** The field study indicated that the sunlit areas had a higher abundance of *** and a lower diversity of resident herbaceous species than the shaded *** common garden experiment showed that sun-dwelling *** individuals performed better in germinative,vegetative,eco-physiological,and reproductive traits than the shade-dwelling *** growth chamber experiment exhibited that plants grown in high-light environment had greater seed germi

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Enhancing mild Cognitive Impairment Detection through Efficient magnetic Resonance Image Analysis

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Computers, materials & Continua 2024年第8期80卷 2081-2098页

作者： Atif mehmood Zhonglong Zheng Rizwan Khan Ahmad Al Smadi Farah shahid shahid Iqbal mutasem K.Alsmadi Yazeed Yasin Ghadi Syed Aziz shah mostafa m.Ibrahim Department of Computer Science and Technology Zhejiang Normal UniversityJinhua321002China Zhejiang Institute of Photoelectronics&Zhejiang Institute for Advanced Light Source Zhejiang Normal UniversityJinhua321004China Department of Data Science and Artificial Intelligence Zarqa UniversityZarqa13100Jordan School of Chemical and Environmental Engineering College of ChemistryChemical Engineering andMaterials ScienceSoochow UniversitySuzhou215123China Department of management Information Systems College of Applied Studies and Community ServiceImam Abdulrahman Bin Faisal UniversityDammam32244Saudi Arabia Department of Computer Science Al Ain UniversityAbu Dhabi999041United Arab Emirates Department of Electrical Engineering Faculty of EngineeringMinia UniversityMinia61519Egypt Healthcare Technology and Innovation Theme Faculty Research Centre for Intelligent HealthcareCoventry UniversityCoventryCV48BWUK

Neuroimaging has emerged over the last few decades as a crucial tool in diagnosing Alzheimer’s disease(AD).mild cognitive impairment(mCI)is a condition that falls between the spectrum of normal cognitive function and ***,previous studies have mainly used handcrafted features to classify mCI,AD,and normal control(NC)*** paper focuses on using gray matter(Gm)scans obtained through magnetic resonance imaging(mRI)for the diagnosis of individuals with mCI,AD,and *** improve classification performance,we developed two transfer learning strategies with data augmentation(i.e.,shear range,rotation,zoom range,channel shift).The first approach is a deep Siamese network(DSN),and the second approach involves using a cross-domain strategy with customized *** performed experiments on the Alzheimer’s Disease Neuroimaging Initiative(ADNI)dataset to evaluate the performance of our proposed *** experimental results demonstrate superior performance in classifying the three binary classification tasks:NC ***,NC ***,and mCI ***,we achieved a classification accuracy of 97.68%,94.25%,and 92.18%for the three cases,*** study proposes two transfer learning strategies with data augmentation to accurately diagnose mCI,AD,and normal control individuals using Gm *** findings provide promising results for future research and clinical applications in the early detection and diagnosis of AD.

关键词： Alzheimer’s disease mild cognitive impairment normal control transfer learning classification augmentation