检索结果-南通市图书馆

Fractional order adaptive robust formation control of multiple quad-rotor UAVs with parametric uncertainties and wind disturbances

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2022年第8期35卷 204-220页

作者： Nasim ULLAH Yasir MEHMOOD jawad aslam Shaoping WANG Khamphe PHOUNGTHONG Environmental Assessment and Technology for Hazardous Waste Management Research Center Faculty of Environmental ManagementPrince of Songkla UniversitySongkhla 90112Thailand Department of Electrical Engineering College of Engineering Taif UniversityAl-HawiyahTaif P.O Box:888Kingdom of Saudi Arabia School of Mechanical and Manufacturing Engineering NUSTIslamabad 44000 Pakistan School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100083China Faculty of Environmental Management Prince of Songkla UniversitySongkla90112Thailand

In recent times,multiple Unmanned Aerial Vehicles(UAVs)are being widely utilized in several areas of applications such as agriculture,surveillance,disaster management,search and rescue *** of robustness of applied control schemes determines how accurate a swarm of UAVs accomplish group *** and trajectory tracking controllers are required for the swarm of multiple *** like external environmental effects,parametric uncertainties and wind gusts make the controller design process as a challenging *** article proposes fractional order formation and trajectory tacking controllers for multiple quad-rotors using Super Twisting Sliding Mode Control(STSMC)*** compensate the effects of the disturbances due to parametric uncertainties and wind gusts,Lyapunov function based adaptive controllers are ***,Lyapunov theorem is used to guarantee the stability of the proposed *** types of controllers,namely fixed gain STSMC and fractional order Adaptive Super Twisting Sliding Mode Control(ASTSMC)methods are tested for the swarm of UAVs by performing the numerical simulations in MATLAB/Simulink *** the presented results,it is verified that in presence of wind disturbances and parametric uncertainties,the proposed fractional order ASTSMC technique showed improved robustness as compared to the fixed gain STSMC and integer order ASTSMC.

关键词： Adaptive robust control Fractional order control Nonlinear control Quad-rotor UAVs Swarm formation control

Exploring the impact of mobile device use on mealtime distractions and its consequences for metabolic health:A narrative minireview

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2025年第17期13卷 7-15页

作者： Muhammad Shahzad aslam School of Traditional Chinese Medicine Xiamen University MalaysiaSepang 43900SelangorMalaysia

The habitual use of smartphones during meals has become a common behavior,raising concerns about its potential impact on eating habits and metabolic *** present narrative review investigates how using a smartphone or tablet during meals can cause distractions and negatively affect metabolic health.A comprehensive narrative review was conducted by synthesizing peer-reviewed studies on the interplay between smartphone use during meals,eating behaviors,and metabolic *** literature was identified through searches in electronic databases and organized thematically to highlight trends and research *** synthesizing evidence from existing literature,this review highlights that smartphone use during meals is associated with increased caloric intake,altered food composition,and disruptions in postprandial metabolic *** effects are mediated by reduced meal awareness and psychological distractions,including *** in findings arises from differences in study designs and *** review identifies critical research gaps,including the lack of longitudinal studies and the need to explore mechanisms underlying these *** summarizing trends and patterns,this narrative review offers valuable insights into the complex interplay between digital device use,eating habits,and metabolic health,providing a foundation for future research and interventions.

关键词： Digital devices Smartphone usage Mealtime behavior Eating habits Postprandial glucose Screen time Dietary patterns Metabolic responses Technological distractions Mobile health

Accretion onto the Magnetically Charged Regular Black Hole

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2017年第7期34卷 38-40页

作者： M.Azam A.aslam Division of Science and Technology University of Education Lahore 54590 Pakistan

We investigate the accretion process for static spherically symmetric geometry, i.e., magnetically charged regular black hole with isotropic fluid. W＇e obtain generalized expressions for the velocity （u（r））, speed of sound （cs2）, energy density （ρ（r）） and accretion rate （M） at the critical point near the regular black hole during the accretion process. We also plot these physical parameters against fixed values of charge, mass and different values of equation of state parameter to study the process of accretion. We find that radial velocity and energy density of the fluid remain positive and negative as well as rate of change of mass is increased and decreased for dust, stiff, quintessence fluid and phantom-like fluid, respectively.

关键词： Accretion onto the Magnetically Charged Regular Black Hole

Evaluation of the adsorption potential of titanium dioxide nanoparticles for arsenic removal

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2009年第3期21卷 402-408页

作者： NABI Deedar aslam Irfan QAZI Ishtiaq A Institute of Environmental Science and Engineering National University of Sciences and Technology Rawalpindi 46000 Pakistan

The adsorption potential of titanium dioxide （TiO2） nanoparticles for removing arsenic from drinking water was evaluated. Pure and iron-doped TiO2 particles are synthesized via sol-gel method. The synthesized TiO2 nanoparticles were then immobilized on ordinary sand for adsorption studies. Adsorption isotherms were conducted on the synthesized nanoparticles as well as the sand coated with TiO2 nanoparticles under varying conditions of air and light, namely, the air-sunlight （A-SL）, air-light （AL）, air-dark （AD） and nitrogen-dark （ND）. X-ray diffraction （XRD） analysis showed that the pure and iron-doped TiO2 nanoparticles were in 100% anatase crystalline phase with crystai sizes of 108 and 65 nm, respectively. Adsorption of arsenic on the three adsorbents was non-linear that could be described by the Freundlich and Langmuir adsorption models. Iron doping enhanced the adsorption capacity of TiO2 nanoparticles by arresting the grain growth and making it visible light responsive resulting in a higher affinity for arsenic. Similarly, the arsenic removal by adsorption on the sand coated with TiO2 nanoparticles was the highest among the three types of sand used. In all cases, As（V） was adsorbed more compared with As（Ⅲ）. The solution pH appeared to be the most important factor in controlling the amount of arsenic adsorbed.

关键词： arsenic removal titanium dioxide nanoparticles adsorption isotherm immobilization of nanoparticles on sand

B→0^+(1^+)+ missing energy in unparticle physics

在线全文

学校读者我要写书评

暂无评论

Chinese Physics C 2009年第5期33卷 332-339页

作者： M.Jamil aslam 吕才典 Institute of High Energy Physics CAS Department of Physics COMSATS Institute of Information Technology School of Physics and Technology Nanjing Normal University

We examine the effects of an unparticle U as a possible source of missing energy in the p-wave decays of a B meson. The dependence of the differential branching ratio on the K0^＊（K1） - meson＇s energy is discussed in the presence of scalar and vector unparticle operators and significant deviation from the standard model value is found after addition of these operators. Finally, we have shown the dependence of the branching ratio for the above-mentioned decays on the parameters of unparticle stuff like effective couplings, cutoff scale Au and the scale dimensions du.

关键词： unparticle missing energy B physics

A Novel Energy and Communication Aware Scheduling on Green Cloud Computing

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第12期77卷 2791-2811页

作者： Laila Almutairi Shabnam Mohamed aslam Department of Computer Engineering Computer Science and Information Technology CollegeMajmaah UniversityAl Majmaah11952Saudi Arabia Department of Information Technology Computer Science and Information Technology CollegeMajmaah UniversityAl Majmaah11952Saudi Arabia

The rapid growth of service-oriented and cloud computing has created large-scale data centres *** data centres’operating costs mostly come from back-end cloud infrastructure and energy *** cloud computing,extensive communication resources are ***,cloud applications require more bandwidth to transfer large amounts of data to satisfy end-user *** is also essential that no communication source can cause congestion or bag loss owing to unnecessary switching *** paper proposes a novel Energy and Communication(EC)aware scheduling(EC-scheduler)algorithm for green cloud computing,which optimizes data centre energy consumption and traffic *** primary goal of the proposed EC-scheduler is to assign user applications to cloud data centre resources with minimal utilization of data *** first introduce a Multi-Objective Leader Salp Swarm(MLSS)algorithm for task sorting,which ensures traffic load balancing,and then an Emotional Artificial Neural Network(EANN)for efficient resource ***-scheduler schedules cloud user requirements to the cloud server by optimizing both energy and communication delay,which supports the lower emission of carbon dioxide by the cloud server system,enabling a green,unalloyed *** tested the proposed plan and existing cloud scheduling methods using the GreenCloud simulator to analyze the efficiency of optimizing data centre energy and other scheduler *** EC-scheduler parameters Power Usage Effectiveness(PUE),Data Centre Energy Productivity(DCEP),Throughput,Average Execution Time(AET),Energy Consumption,and Makespan showed up to 26.738%,37.59%,50%,4.34%,34.2%,and 33.54%higher efficiency,respectively,than existing state of the art schedulers concerning number of user applications and number of user requests.

关键词： EC-scheduler green cloud energy efficiency task scheduling task sorting resource allocation

A high-precision heuristic model to detect home and work locations from smart card data

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Geo-Spatial Information Science 2019年第1期22卷 1-11页

作者： Nilufer Sari aslam Tao Cheng James Cheshire SpaceTimeLab Department of CivilEnvironmental and Geomatic EngineeringUniversity College LondonLondonUK Department of Geography University College LondonLondonUK

Smart card-automated fare collection systems now routinely record large volumes of data comprising the origins and destinations of *** and analyzing these data open new opportunities in urban modeling and travel behavior *** study seeks to develop an accurate framework for the study of urban mobility from smart card data by developing a heuristic primary location model to identify the home and work *** model uses journey counts as an indicator of usage regularity,visit-frequency to identify activity locations for regular commuters,and stay-time for the classification of work and home locations and *** is taken as a case study,and the model results were validated against survey data from the London Travel Demand Survey and volunteer *** demonstrate that the proposed model is able to detect meaningful home and work places with high *** study offers a new and cost-effective approach to travel behavior and demand research.

关键词： Smart card data activity location modeling heuristic primary location model home and work locations human mobility pattern urban activity pattern

Synthesis and Characterization of Alkaline-Earth Metal (Ca, Sr, and Ba) Doped Nanodimensional LaMnO_(3) Rare-Earth Manganites

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 2013年第7期30卷 217-220页

作者： Asma Khalid Saadat Anwar Siddiqi Affia aslam School of Physics University of MelbourneParkville VIC 3010Australia Interdisciplinary Research Centre in Biomedical Materials COMSATS Institute of Information TechnologyDefence RoadOff Raiwind RoadLahore-54700Pakistan Department of Physics University of HailHail-30055Saudi Arabia

The substitution of divalent cations of alkaline-earth elements in nanodimensional structures of rare-earth manganites produces advanced materials with potential electrical and magnetic functionalities.A systematic investigation of La_(0.65)A_(0.35)MnO_(3)(A=Ca,Sr,Ba)materials synthesized with a modified citrate route adopting ethanol dehydration has been *** structural and morphological analyses are carried out by using x-ray diffraction and scanning electron microscopy,*** measurements are performed in variation with temperature to study the electrical transport properties which are found to vary with the size of the A-site cationic *** temperature magnetic measurements are carried out to investigate the type of magnetic phase present in *** stability of the magnetic phase and coercivity are found to be dependent on the size of nanocrystallites.

关键词： materials. earth dimensional

SI Engine Fueled with Gasoline, CNG and CNG-HHO Blend: Comparative Evaluation of Performance, Emission and Lubrication Oil Deterioration

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2021年第4期30卷 1199-1211页

作者： USMAN Muhammad HAYAT Nasir BHUTTA Muhammad Mahmood aslam Department of Mechanical Engineering University of Engineering and TechnologyLahore 54890Pakistan

Hydroxy gas (HHO) is one of the potential alternative fuels for spark ignition (SI) engine,notably due to simultaneous increase in engine performance and reduction in exhaust ***,impact of HHO gas on lubrication oil for longer periods of engine operation has not yet been *** study focuses on investigation of the effect of gasoline,CNG and CNG-HHO blend on lubrication oil deterioration along with engine performance and emissions in SI *** unit produces HHO gas at 4.72 L/min by using 6 g/L of KOH in the aqueous *** was supplied to the test engine at a pressure of 0.11 MPa using an electronically controlled solenoid *** tests were carried out at different speeds at 80%open throttle condition and various performance parameters such as brake power (BP),brake specific fuel consumption(BSFC),brake thermal efficiency (BTE),exhaust gas temperature and exhaust emissions (HC,CO_(2),CO and NO_(x))were *** addition,various lubrication oil samples were extracted over 120 h of engine running while topping for drain out volume and samples were analyzed as per ASTM ***-HHO blend exhibited better performance i.e.,15.4%increase in average BP in comparison to CNG,however,15.1%decrease was observed when compared to ***-HHO outperformed gasoline and CNG in the case of HC,CO_(2),CO and brake specific fuel consumption (31.1%decrease in comparison to gasoline).On the other hand,CNG-HHO produced higher average NO_(x) (12.9%) when compared to CNG ***,lubrication oil condition(kinematic viscosity,water contents,flash point and total base number (TBN)),wear debris (Iron (Fe),Aluminum(Al),Copper (Cu),Chromium (Cr)) and additives depletion (Zinc (Zn),Calcium (Ca)) presented a significant degradation in the case of CNG-HHO blend as compared to gasoline and *** oil analyses illustrated 19.6%,12.8%and 14.2%decrease in average viscosity,flash point and TBN for CNG-HHO blend ***,

关键词： spark ignition engine compressed natural gas hydrogen lubrication oil deterioration emission