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Brownian motion and thermophoresis effects on unsteady stagnation point flow of Eyring-Powell nanofluid: a Galerkin approach

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Communications in Theoretical Physics 2020年第12期72卷 71-82页

作者： Z H Khan M usman T Zubair M Hamid r u haq State Key Laboratory of Hydraulics and Mountain river Engineering College of Water Resource and HydropowerSichuan UniversityChengdu610065China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Institute of Ocean research Peking UniversityBeijing 100871China School of Mathematical Sciences Peking UniversityBeijing 100871China Department of Mechanics and Engineering Science Fudan UniversityShanghai 200433China Department of Electrical Engineering Bahria UniversityIslamabad CampusIslamabad 44000Pakistan

This article concerns the analysis of an unsteady stagnation point flow of Eyring–Powell nanofluid over a stretching *** influence of thermophoresis and Brownian motion is also considered in transport *** nonlinear ODE set is obtained from the governing nonlinear equations via suitable *** numerical experiments are performed using the Galerkin scheme.A tabular form comparison analysis of outcomes attained via the Galerkin approach and numerical scheme(rK-4)is available to show the credibility of the Galerkin *** numerical exploration is carried out for various governing parameters,namely,Brownian motion,steadiness,thermophoresis,stretching ratio,velocity slip,concentration slip,thermal slip,and fluid parameters,and Hartmann,Prandtl and Schmidt *** velocity of fluid enhances with an increase in fluid and magnetic parameters for the case of opposing,but the behavior is reversed for assisting *** Brownian motion and thermophoresis parameters cause an increase in temperature for both cases(assisting and opposing).The Brownian motion parameter provides a drop-in concentration while an increase is noticed for the thermophoresis *** the outcomes and the behavior of emerging parameters are illustrated *** comparison analysis and graphical plots endorse the appropriateness of the Galerkin *** is concluded that said method could be extended to other problems of a complex nature.

关键词： Eyring-Powell fluid stagnation point flow Brownian motion and thermophoresis Galerkin method

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Wavelet analysis of stagnation point flow of non-Newtonian nanofluid

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Applied Mathematics and Mechanics(English Edition) 2019年第8期40卷 1211-1226页

作者： M.HAMID M.uSMAN r.u.haq4 Z.H.KHAN Wei WANG School of Mathematical Sciences Peking UniversityBeijing 100871China BIC-ESAT College of EngineeringPeking UniversityBeijing 100871China State Key Laboratory for Turbulence and Complex Systems Department of Mechanics and Engineering SciencePeking UniversityBeijing 100871China Department of Electrical Engineering Bahria UniversityIslamabad 44000Pakistan State Key Laboratory of Hydraulics and Mountain river Engineering College of Water Resource & HydropowerSichuan UniversityChengdu 610065China Key Laboratory of Advanced reactor Engineering and Safety Ministry of Education Tsinghua UniversityBeijing 100084China

The wavelet approach is introduced to study the influence of the natural convection stagnation point flow of the Williamson fluid in the presence of thermophysical and Brownian motion effects. The thermal radiation effects are considered along a permeable stretching surface. The nonlinear problem is simulated numerically by using a novel algorithm based upon the Chebyshev wavelets. It is noticed that the velocity of the Williamson fluid increases for assisting flow cases while decreases for opposing flow cases when the unsteadiness and suction parameters increase, and the magnetic effect on the velocity increases for opposing flow cases while decreases for assisting flow cases. When the thermal radiation parameter, the Dufour number, and Williamson’s fluid parameter increase, the temperature increases for both assisting and opposing flow cases. Meanwhile, the temperature decreases when the Prandtl number increases. The concentration decreases when the Soret parameter increases, while increases when the Schmidt number increases. It is perceived that the assisting force decreases more than the opposing force. The findings endorse the credibility of the proposed algorithm, and could be extended to other nonlinear problems with complex nature.

关键词： Williamson nanofluid heat and mass transfer stagnation point flow assisting and opposing flow Chebyshev wavelet method

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Dual solutions in MHD stagnation-point flow of Prandtl fluid impinging on shrinking sheet

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Applied Mathematics and Mechanics(English Edition) 2014年第7期35卷 813-820页

作者： N.S.AKBAr Z.H.KHAN r.u.haq S.NADEEM Department of Basic Science & Humanities College of Electrical & Mechanical Engineering(CEME) National University of Sciences and Technology Islamabad 46000 Pakistan School of Mathematical Sciences Peking University Department of Mathematics University of Malakand Khyber Pakhtunktwo 18800 Pakistan Department of Mathematics Quaid-i-Azam University Islamabad 44000 Pakistan

The present article investigates the dual nature of the solution of the magneto- hydrodynamic （MHD） stagnation-point flow of a Prandtl fluid model towards a shrinking surface. The self-similar nonlinear ordinary differential equations are solved numerically by the shooting： method. It is found that the dual solutions of the flow exist for cer- tain values of tile velocity ratio parameter. The special case of the first branch solutions （the classical Newtonian fluid model） is compared with the present numerical results of stretching flow. The results are found to be in good agreement. It is also shown that the boundary layer thickness for the second solution is thicker than that for the first solution.

关键词： stagnation-point flow shrinking sheet Prandtl fluid magnetohydrody-namic (MHD) dual solution shooting method

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Quantitative analysis of saindha salt using laser induced breakdown spectroscopy and cross-validation with ICP-MS

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Plasma Science and Technology 2020年第7期22卷 51-58页

作者： M QASIM M ANWAr-uL-haq M SHEr AFGAN S u haq M A BAIG Department of Physics University of SargodhaSargodha 40100Pakistan Department of Energy&Power Engineering Tsinghua-BP Clean Energy CenterTsinghua UniversityBeijing 100084People’s Republic of China National Institute of Lasers and Optronics(NILOP) NiloreIslamabad 45650Pakistan National Center for Physics Quaid-i-Azam University CampusIslamabad 45320Pakistan

Saindha salt is considered to be more advantageous than the other edible salts for the patients suffering from diabetes,blood pressure and kidney *** explore the constituent elements of this salt,laser induced breakdown spectroscopy(LIBS) has been exploited for its qualitative and quantitative *** third harmonic(355 nm) of a Q-switched Nd:YAG laser has been used to produce the saindha salt plasma and the time integrated optical emission spectra were registered using a set of six miniature spectrometers covering the spectral range of 230-805 *** spectroscopic analysis of the emission spectra predominately revealed numerous neutral or singly ionized emission lines of Ca,Mg,Na,K,Fe,Sr,Si,Li and *** laser produced plasma was characterized by calculating the electron temperature from the Boltzmann plots and the electron number density from the Stark broadened line profile as a function of laser irradiance and distance from the target *** relative concentration of the constituent elements was extracted by the integrated line intensities of the strongest spectral line of each element using the self-calibration-LIBS(SC-LIBS) and one-line calibration free-LIBS(OLCF-LIBS) *** cross-validation,the LIBS results have been compared with that obtained from the inductively coupled plasma-mass spectroscopy(ICP-MS) showing good agreement.

关键词： elemental analysis CF-LIBS plasma parameters

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Anatomy of a eustatic event during the Turonian (Late Cretaceous) hot greenhouse climate

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Science China Earth Sciences 2017年第1期60卷 20-29页

作者： Bilal u. haq Brian T. HuBEr Department of Paleobiology MRC-121Smithsonian InstitutionWashington D C 20013USA Sorbonne ISTEP Pierre&Marie Curie UniversityParis 75005France

Sequence stratigraphic studies consider relative change in sea level(as regulated by eustasy,local tectonics and sediment supply)as the main builder of the stratigraphic *** has generally been considered as a consequence of the growth and decay of continental ice sheets that would explain large,rapid changes in sea level,even during periods of relative global climatic ***,such a mechanism has become increasingly difficult to envision during times of extreme global warmth such as the Turonian,when the equator-to-pole temperature gradient was very low and the presence of polar ice seems *** paper investigates the timing and extent of sea level falls during the late Cenomanian through Turonian,especially the largest of those events,sequence boundary KTu4,which occurred during the middle to late Turonian peak of the Cretaceous hot greenhouse *** conclude that the amplitude of the widespread third-order sea level fall in the middle Turonian that is centered at^91.8 Ma varies at different locations depending on the influence of dynamic topography on local tectonics and regional climatic *** volume variations seem unlikely as a mechanism for controlling sea level at this ***,this causal factor cannot be ruled out completely since Antarctic highlands(if they existed in the Late Cretaceous)could sequester enough water as ice to cause eustatic *** ascertain this requires detailed tomographic imaging of Antarctica,followed by geodynamic modeling,to determine whether high plateaus could have existed to accumulate ephemeral ice *** mechanisms for sea level change,such as transference between ground water(a small amplitude shorter time scale effect)and the ocean and entrainment and release of water from the mantle to the oceanic reservoir(a potentially large amplitude and longer time scale process),are intriguing and need to be explored further to prove their efficacy at third-order time scales.

关键词： Eustatic event Turonian Hot greenhouse climate

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Structural,electronic,and magnetic properties of Co-doped ZnO

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Chinese Physics B 2012年第9期21卷 414-421页

作者： Bakhtiar ul haq A. Afaq r. Ahmed S. Naseem Center of Excellence in Solid State Physics University of the Punjab Quid-e-Azam CampusLahore-54590 Pakistan Department of Physics Faculty of Science Universiti Teknologi Malaysia Skudai Johar Malaysia Center of Excellence in Solid State Physics University of the Punjab Quid-e-Azam Campus Lahore-54590 Pakistan

Density functional theory based calculations have been carried out to study structural, electronic, and magnetic properties of Znl-xCoxO （x = 0, 0.25, 0.50, 0.75） in the zinc-blende phase, and the generalized gradient approximation proposed by Wu and Cohen has been used. Our calculated lattice constants decrease while the bulk moduli increase with the increase of Co2＋ concentration. The calculated spin polarized band structures show the metallic behavior of Co-doped ZnO for both the up and the down spin cases with various doping concentrations. Moreover, the electron population is found to shift from the Zn-O bond to the Co-O bond with the increase of Co2~ concentration. The total magnetic moment~ the interstitial magnetic moment, the valence and the conduction band edge spin splitting energies, and the exchange constants decrease, while the local magnetic moments of Zn, Co, O, the exchange spin splitting energies, and crystal field splitting energies increase with the increase of dopant concentration.

关键词： density functional theory magnetic semiconductors generalized gradient approximation

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Psychotropic Medication refusal:reasons and Patients’Perception at a Secure Forensic Psychiatric Treatment Centre

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Journal of Forensic Science and Medicine 2016年第1期2卷 12-17页

作者： Olajide O Adelugba Mansfield Mela Inam u haq regional Psychiatric Center University of SaskatchewanSaskatoonSaskatchewanCanada Department of Psychiatry University of SaskatchewanSaskatoonSaskatchewanCanada

Poor adherence to prescribed medication regimens can undermine the effectiveness of *** study was conducted to determine the demographic profile of forensic psychiatric inpatients refusing medications and to identify the reasons for *** were collected through interviews using a questionnaire including Drug Attitude Inventory‑*** refusal was more common among Aboriginals(68%,n=34)than Caucasians(32%,n=16)and was highest among the patients 21–30 years of age(44%,n=22).Antisocial personality disorder and substance use disorder featured prominently among patients refusing *** main reasons for medication refusal were inconvenience(34%,n=17)followed by side effects(22%,n=11),ineffective medication(20%,n=10),illness‑related(16%,n=8),and no reasons(8%,n=6).Antipsychotic medications topped the list of the major classes of medications refused followed by Antidepressants and Mood Stabilizers.

关键词： Forensic medication nonadherence psychiatry refusal

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CDLSTM: A Novel Model for Climate Change Forecasting

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Computers, Materials & Continua 2022年第5期71卷 2363-2381页

作者： Mohd Anul haq Department of Computer Science College of Computer and Information SciencesMajmaah UniversityAL Majmaah11952Saudi Arabia

Water received in rainfall is a crucial natural resource for agriculture,the hydrological cycle,and municipal *** changing rainfall pattern is an essential aspect of assessing the impact of climate change on water resources planning and *** change affected the entire world,specifically India’s fragile Himalayan mountain region,which has high significance due to being a climatic *** water coming from Himalayan rivers is essential for 1.4 billion people living *** studies either modeled temperature or rainfall for the Himalayan area;however,the combined influence of both in a long-term analysis was not performed utilizing Deep Learning(DL).The present investigation attempted to analyze the time series and correlation of temperature(1796–2013)and rainfall changes(1901–2015)over the Himalayan states in *** Climate Deep Long Short-Term Memory(CDLSTM)model was developed and optimized to forecast all Himalayan states’temperature and rainfall ***’s Prophet(FB-Prophet)model was implemented to forecast and assess the performance of the developed CDLSTM *** performance of both models was assessed based on various performance metrics and shown significantly higher accuracies and low error rates.

关键词： Himalayas climate change cdlstm facebook temperature rainfall

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SMOTEDNN: A Novel Model for Air Pollution Forecasting and AQI Classification

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Computers, Materials & Continua 2022年第4期71卷 1403-1425页

作者： Mohd Anul haq Department of Computer Science College of Computer and Information SciencesMajmaah University Almajmaah11952Saudi Arabia

rapid industrialization and urbanization are rapidly deteriorating ambient air quality,especially in the developing *** pollutants impose a high risk on human health and degrade the environment as *** studies have used machine learning(ML)and statistical modeling to classify and forecast air ***,these methods suffer from the complexity of air pollution dataset resulting in a lack of efficient classification and forecasting of air ***-based models suffer from improper data preprocessing,class imbalance issues,data splitting,and hyperparameter *** is a gap in the existing ML-based studies on air pollution due to improper data handling and *** present investigation aims to bridge these gaps and aid in effective air pollution classification and *** ML models were developed,including one novel model named SMOTEDNN(Synthetic Minority Oversampling Technique with Deep Neural Network)to address air pollution *** five models utilized efficient data pre-processing and rigorous hyperparameter *** forecasting models were developed to forecast air pollution for one step-index based on statistical *** developed models in present investigation showed higher ***,the novel model SMOTEDNN achieved an accuracy of(99.90%)higher than the other models from the current investigation and previous studies.

关键词： Air pollution smote dnn classification autoregression

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First-principles calculations of nitrogen-doped antimony triselenide： A prospective material for solar cells and infrared optoelectronic devices

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Frontiers of physics 2018年第3期13卷 129-140页

作者： Sajid-ur-rehman Faheem K. Butt Chuanbo Li Bakhtiar u1 haq Zeeshan Tariq F. Aleem State Key Laboratory on Integrated Optoelectronics Institute of Semiconductors Chinese Academy of Sciences College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing 100083 China university of Chinese Academy of Sciences Beijing 100049 China Department of Physics Division of Science and Technology University of Education College Road Township Lahore 54770 Pakistan Physik-Department ECS Technische Universitat Miinchen James-Franck-Str. 1 D-85748 Garching Germany School of Science Minzu University of China Beijing 100081 China Advanced Functional Materials & Optoelectronics Laboratory (AFMOL) Department of Physics Faculty of Science King Khalid University P.O. Box 9004 Abha Saudi Arabia research Center for Advanced Materials Science (rCAMS) King Khalid University Abha 61413 P.O. Box 9004 Saudi Arabia Department of Physics The University of Lahore l-Kin Raiwind Road Lahore 53700 Pakistan

This study is focused on calculation of the electronic structure and optical properties of non-metal doped Sb2Se3 using the first-principles method. One and two N atoms are introduced to Sb and Se sites in a Sb2Se3 crystal. When one and two N atoms are introduced into the Sb2Se3 lattice at Sb sites, the electronic structure shows that the doping significantly modifies the bandgap of Sb2Se3 from 1.11 eV to 0.787 and 0.685 eV, respectively. When N atoms are introduced to Se sites, the material shows a metallic behavior. The static dielectric constants el（0） for Sb16Se24, SblsN1Se24, Sb14N2Se24, Sb16Se23N1, and Sb16Se22N2 are 14.84, 15.54, 15.02, 18.9, and 39.29, respectively. The calculated values of the refractive index n（0） for Sb16Se24, SblsN1Se24, Sb14N2Se24, Sb16Se23N1, and Sb16Se22N2 are 3.83, 3.92, 3.86, 4.33, and 6.21, respectively. The optical absorbance and optical conductivity curves of the crystal for N-doping at Sb sites show a significant redshift towards the short-wave infrared spectral region as compared to N-doping at Se sites. The modulation of the static refractive index and static dielectric constant is mainly dependent on the doping level. The optical properties and bandgap narrowing effect suggest that the N-doped Sb2Se3is a promising new semiconductor and can be a replacement for GaSb due to its very similar bandgap and low cost.

关键词： Sb2Se3 infrared optical properties solar cells optoelectronic devices

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