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Hydrodynamics and Sensitivity Analysis of a Williamson Fluid in Porous-Walled Wavy Channel

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Computers, Materials & Continua 2021年第9期68卷 3877-3893页

作者： a.shahzad W.A.Khan R.Gul B.Dayyan M.Zubair Department of Mathematics COMSATS University IslamabadAbbottabad Campus22060Pakistan Department of Mechanical Engineering College of Engineering Prince Mohammad Bin Fahd UniversityAl Khobar31952Kingdom of Saudi Arabia

In this work,a steady,incompressible Williamson fluid model is investigated in a porous wavy *** situation arises in the reabsorption of useful substances from the glomerular filtrate in the *** 80%reabsorption,urine is left,which behaves like a thinning *** laws of conservation of mass and momentum are used to model the physical *** analytical solution of the problem in terms of stream function is obtained by a regular perturbation expansion *** asymptotic integration method for small wave amplitudes and the RK-Fehlberg method for pressure distribution has been used inside the *** is demonstrated that the forward flow becomes fast in the narrow region(at x=0.75),which dominates the upward flow inside the *** study the impact of model parameters on outputs,we applied normalized local sensitivity analysis and noticed that the most influential parameter for the longitudinal velocity profile is the dimensionless wave *** reabsorption parameter is sensitive for transverse velocity in the narrow region,and the Weissenberg number has a strong effect on the pressure inside the ***,the least sensitive parameters for the velocity components and pressure have been identified.

关键词： Sensitivity analysis Williamson fluid regular perturbation method asymptotic approximation RK-Fehlberg method kidney flow

Global export flow of Chilean copper:The role of environmental innovation and renewable energy transition

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Geoscience Frontiers 2024年第3期15卷 336-345页

作者： Shujaat Abbas Najia Saqib Umer shahzad Graduate School of Economics and Management Ural Federal UniversityRussian Federation Brandenburg University of Technology Chair of Energy EconomicsGermany Adnan Kassar School of Business Lebanese American UniversityBeirutLebanon MEU Research Unit Middle East UniversityAmmanJordan Department of Finance College of Business AdministrationPrince Sultan UniversityRiyadhSaudi Arabia Department of Trade and Finance Faculty of Economics and ManagementCzech University of Life Sciences Prague

Copper is one of the most important minerals that has extensive use in environment-friendly technologies and renewable energy *** global urgency for environmental and ecological conservation through renewable energy transition has considerably enhanced the importance of copper and articles *** is a major producer of *** contributes more than one-third to global ***,this study explores the export flow of Chilean copper in response to increasing demand side conditions in major 24 trading partners from 2002 to *** objective is realized by constructing an augmented model for import demand that incorporates bilateral real exchange rate along with real GDP,environmental innovation,and renewable energy transition in major import *** estimated results of panel quantiles via moments techniques reveal a significant positive impact with increasing coefficients at higher quantiles,while environmental innovation and renewable energy transition in trading partners show significant positive impact with decreasing values of coefficients at higher *** findings urge Chile to enhance production capacity of copper and other critical mineral and improve participation in global value chain to meet sharply increasing copper demand from environmental innovation and renewable energy transition.

关键词： Copper Export flow Renewable energy Environmental innovation Panel data Quantiles via moments

Resource savings,recycling and utilization,and energy transition:Introduction

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Geoscience Frontiers 2024年第3期15卷 180-182页

作者： Xin Zhao Umer shahzad Aviral Kumar Tiwari School of Statistics and Applied Mathematics Anhui University of Finance and EconomicsBengbu 233030China School of Economics Széchenyi Istvàn UniversityHungary Adnan Kassar School of Business Lebanese American UniversityBeirutLebanon Indian Institute of Management Bodh Gaya Bodh GayaBiharIndia

In the context of increasingly tight constraints on global resources and environment,accelerating the conservation and recycling of fossil fuels and other mineral resources have become significant *** promoting the transformation of energy development mode,and making efficient use of coal,oil,natural gas,iron ore,potassium salts,phosphate,sulfur and other mineral resources have become important issues in energy planning and energy *** the framework of Sustainable Development Goals,it is urgent and critical to investigate the relationship between geological resource saving,recycling and modern energy systems,which is an important step to establish a complete system of efficient use of natural resources.

关键词： energy transition recycling

(Sm/Eu/Tm)^(3+) doped tantalum semiconductor system for photovoltaic and electrochemical functionality amplification

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Journal of Rare Earths 2024年第8期42卷 1586-1594,I0007页

作者： Shaan Bibi Jaffri Khuram shahzad Ahmad Isaac Abrahams Ibrahim A.A Materials and Environmental Chemistry Lab Lab-E21Department of Environmental SciencesFatima Jinnah Women UniversityRawalpindiPakistan School of Physical and Chemical Sciences Queen Mary University of LondonLondonUnited Kingdom Department of Botany and Microbiology College of ScienceKing Saud UniversityP.O.Box 2455Riyadh11451Saudi Arabia

This work reports the synthesis,characterization,and energy focused applications of the novel lanthanides co-doped tantalum pentoxide hetero-system(Sm^(3+)-Eu^(3+)-Tm^(3+):Ta_(2)O_(5)).Ln^(3+)-doped Ta_(2)O_(5) express excellent opto-electronic features reflected by the narrow band gap energy of 3.87 *** vibrations confirm the presence of Ta-O-Ta and Ta-O *** synthesized system possesses orthorhombic geometry with 59.46 nm particle *** the smoother and compact morphology,the synthesized material succeeds in augmenting the performance of different systems aimed at energy *** ambient perovskite solar cell device fabricated with the Ln^(3+)-doped Ta_(2)O_(5) as an electron transport layer excels in achieving an efficiency and fill factor of 14.17% and 76% under artificial *** device was marked by the negligible hysteresis behavior showing profound photovoltaic *** electrochemical activity of the Ln^(3+)-doped Ta_(2)O_(5) decorated electrode was evaluated for electrical charge storage potential with pseudocapacitive behavior,With the highest specific capacitance of 355.39 F/g and quicker ionic diffusion rate,the designed electrode excels conventionally used ***-catalysis of water with Ln^(3+)-doped Ta_(2)O_(5) material indicates its capacity for H_(2) production with the lowest overpotential and Tafel slope values of 148 and 121.2 mV/dec,while the O_(2) generation is comparatively *** the stable electrochemical output,this rare earth modified material has the potential to replace conventionally used environmentally perilous and costly materials.

关键词： Lanthanide doping Rare earth materials Perovskite solar cells Supercapacitors Water splitting

Improved Proximal Policy Optimization Algorithm for Sequential Security-constrained Optimal Power Flow Based on Expert Knowledge and Safety Layer

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 742-753页

作者： Yanbo Chen Qintao Du Honghai Liu Liangcheng Cheng Muhammad shahzad Younis State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources and School of Electrical&Electronic Engineering North China Electric Power UniversityBeijing 102206China School of Engineering Xining UniversityXining 810008Chinaand Key Laboratory of Smart Operation of New Energy Power SystemMinistry of EducationQinghai UniversityXining 810016China China Electric Power Research Institute Nanjing 210003China National University of Sciences and Technology Islamabad44000Pakistan

In recent years,reinforcement learning(RL)has emerged as a solution for model-free dynamic programming problem that cannot be effectively solved by traditional optimization *** has gradually been applied in the fields such as economic dispatch of power systems due to its strong selflearning and self-optimizing ***,existing economic scheduling methods based on RL ignore security risks that the agent may bring during exploration,which poses a risk of issuing instructions that threaten the safe operation of power ***,we propose an improved proximal policy optimization algorithm for sequential security-constrained optimal power flow(SCOPF)based on expert knowledge and safety layer to determine active power dispatch strategy,voltage optimization scheme of the units,and charging/discharging dispatch of energy storage *** expert experience is introduced to improve the ability to enforce constraints such as power balance in training process while guiding agent to effectively improve the utilization rate of renewable ***,to avoid line overload,we add a safety layer at the end of the policy network by introducing transmission constraints to avoid dangerous actions and tackle sequential SCOPF *** results on an improved IEEE 118-bus system verify the effectiveness of the proposed algorithm.

关键词： Sequential security-constrained optimal power flow(SCOPF) expert experience safety layer renewable energy safe reinforcement learning

Development of Sustainable Wireless Resource model through Shrewd Neural Network

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Data Intelligence 2024年第3期6卷 649-665页

作者： shahzad Ashraf Furqan Memon Fouzia Akram Zeeshan Rasheed shahzad Sarwar Bhattit Innam Ullah NFC Institute of Engineering and Technology Multan Pakistan DHA Suffa University Karachi Pakistan Mir Chakar Khan Rind University Sibi Pakistan Emerson University Multan Pakistan Gachon University Seongnam 13120Republic of Korea

Due to an increasing number of wireless spectrums,the network components are tangling with multiple frequencies and the result create hindrance in resource management *** resource management process,data leakage is one of the sensitive enigma that requires an astute *** all these issues,a sustainable wireless resource management proposal(DSWR-SNN)has been developed by incorporating a shrewd Neural *** resources are managed by testing performance of each network component connected wirelessly through dataset testing which matches the results from the dataset *** performance of the proposed DSWR-SNN method has been compared with state of the art studies Hopfield Neural Network(HNN),Radio Resource Management(RRM),and Deep Q-Network(DQN),and results are evaluated by conducting simulation using Python with TensorFlow based on Bandwidth Utilization,Duplicate Packet Handling,Data Leakage,and Energy *** result illustrates the marvelous performance of the proposed method and effective in addressing the challenges of resource allocation in wireless communication systems.

关键词： Neural network Sustainable resources Dataset testing Dataset corpus,Data leakage

Clinical applications of stem cell-derived exosomes

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Signal Transduction and Targeted Therapy 2024年第2期9卷 621-651页

作者： Fei Tan Xuran Li Zhao Wang Jiaojiao Li Khawar shahzad Jialin Zheng Department of ORL-HNS Shanghai Fourth People’s Hospitaland School of MedicineTongji UniversityShanghaiChina Plasma Medicine and Surgical Implants Center Tongji UniversityShanghaiChina The Royal College of Surgeons in Ireland DublinIreland The Royal College of Surgeons of England LondonUK Center for Translational Neurodegeneration and Regenerative Therapy Tongji Hospital affiliated to Tongji University School of MedicineShanghaiChina Shanghai Frontiers Science Center of Nanocatalytic Medicine Tongji UniversityShanghaiChina

Although stem cell-based therapy has demonstrated considerable potential to manage certain diseases more successfully than conventional surgery,it nevertheless comes with inescapable drawbacks that might limit its clinical *** to stem cells,stem cell-derived exosomes possess numerous advantages,such as non-immunogenicity,non-infusion toxicity,easy access,effortless preservation,and freedom from tumorigenic potential and ethical *** can inherit similar therapeutic effects from their parental cells such as embryonic stem cells and adult stem cells through vertical delivery of their pluripotency or *** a thorough search and meticulous dissection of relevant literature from the last five years,we present this comprehensive,up-to-date,specialty-specific and disease-oriented review to highlight the surgical application and potential of stem cell-derived *** derived from stem cells(e.g.,embryonic,induced pluripotent,hematopoietic,mesenchymal,neural,and endothelial stem cells)are capable of treating numerous diseases encountered in orthopedic surgery,neurosurgery,plastic surgery,general surgery,cardiothoracic surgery,urology,head and neck surgery,ophthalmology,and obstetrics and *** diverse therapeutic effects of stem cells-derived exosomes are a hierarchical translation through tissue-specific responses,and cell-specific molecular signaling *** this review,we highlight stem cell-derived exosomes as a viable and potent alternative to stem cell-based therapy in managing various surgical *** recommend that future research combines wisdoms from surgeons,nanomedicine practitioners,and stem cell researchers in this relevant and intriguing research area.

关键词： viable stem capable

Financial inclusion and carbon emissions in Asia:Implications for environmental sustainability

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Economic and Political Studies 2024年第1期12卷 88-104页

作者： shahzad Hussain Tanveer Ahmad Sabeeh Ullah Ajid Ur Rehmand Syed Jawad Hussain shahzad Department of Business Administration Rawalpindi Women UniversityRawalpindiPakistan Institute of Business Studies Kohat University of Science and TechnologyKohatPakistan Institute of Business and Management Sciences Faculty of Management and Computer SciencesThe University of AgriculturePeshawarPakistan NUST Business School National University of Sciences and TechnologyIslamabadPakistan Finance Control and Law DepartmentMontpellier Business SchoolMontpellierFrance

This study explores how carbon emissions are affected by financial *** a balanced panel data set of 26 Asian countries,we compute a composite index,through the principal component analysis(PCA)technique,of financial inclusion based on a set of attributes related to financial *** main analysis also delineates the subsamples of developed and developing Asian *** results reveal a long(short)-run positive(negative)impact of financial inclusion on carbon emissions across the Asian *** finding is also true for the developed country subsample,implying nonlinearity in shortand long-run *** the developing countries,a more pronounced long-run positive impact compared to developed countries is ***,the pairwise causality test results indicate the existence of bi-directional causality between financial inclusion and carbon *** findings have important policy implications,especially in the context of the strategic integration of financial inclusion and climate change strategies.

关键词： Financial inclusion CO2 emissions climate change sustainable development Asian countries

Impacts of nuclear energy,greener energy,and economic progress on the load capacity factor:What we learn from the leading nuclear power economies?

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Geoscience Frontiers 2024年第3期15卷 322-335页

作者： Wei Teng Md.Monirul Islam LászlóVasa Shujaat Abbas Umer shahzad School of Business Qilu Institute of TechnologyJinan 250200ShandongChina Graduate School of Economics and Management(GSEM) Ural Federal University(UrFU)YekaterinburgRussia Bangladesh Institute of Governance and Management(BIGM) University of DhakaBangladesh Széchenyi Istvàn University Faculty of EconomicsHungary School of Economics Széchenyi Istvàn UniversityGyorHungary Department of Trade and Finance Faculty of Economics and ManagementCzech University of Life Sciences PragueCzech Republic Adnan Kassar School of Business Lebanese American UniversityBeirutLebanon

The worldwide tremor of environmental degradation commonly represents the escalation of emissions levels and ecological footprints that harm the planet’s *** is because of using gigantic non-renewable energy resources,urbanization stream and massive economic activities in the major industrialized *** this situation,we investigate the influence of disaggregated energy measures,e.g.,renewable,and nuclear energy,income growth and urbanization on the load capacity factor(biocapacity divided by the ecological footprint)of major nuclear power countries,such as France,the USA,Canada,China,and Russia during *** this end,we utilize the CS-ARDL procedure because of the endogeneity,common correlation,non-stationarity in data and heterogeneity in panel *** contribute to considering the supply side dynamic of environmental degradation parameter,the load capacity,from the perspective of the top nuclear power nations that deviates our analysis from the prevailing scholarly ***,our findings confirm a significantly positive impact of renewable and nuclear energy on the load capacity factor in improving environmental ***,economic growth and urbanization negatively affect the load capacity dynamics in spurring environmental *** findings are robust across an alternative estimation technique,namely the Dumitrescu and Hurlin(DH)causation ***,we recommend formulating pragmatic policies to deter the detrimental effects of income and urbanization by properly utilizing sustainable energy resources to conserve the natural environment.

关键词： Renewable energy Economic growth Urbanization Load capacity Environmental degradation Top nuclear power countries