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SWPT:An automated GIS-based tool for prioritization of sub-watersheds based on morphometric and topo-hydrological factors

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Geoscience Frontiers 2019年第6期10卷 2167-2175页

作者： Omid Rahmati Mahmood Samadi Himan Shahabi ali Azareh Elham Rafiei-Sardooi Hossein alilou Assefa M.Melesse Biswajeet Pradhan kamran Chapi Ataollah Shirzadi Geographic Information Science Research Group Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Environment and Labour Safety Ton Duc Thang UniversityHo Chi Minh CityViet Nam Faculty of Natural Resources University of TehranKarajIran Department of Geomorphology Faculty of Natural ResourcesUniversity of KurdistanSanandajIran Department of Geography University of JiroftKermanIran Faculty of Natural Resources University of JiroftKermanIran Aquatic Ecodynamics UWA School of Agriculture and EnvironmentThe University of Western AustraliaCrawleyWA6009Australia Department of Earth and Environment AHC 5-390Florida International UniversityUSA Centre for Advanced Modelling and Geospatial Information Systems(CAMGIS) Faculty of Engineering and ITUniversity of Technology SydneyNSW2007Australia Department of Energy and Mineral Resources Engineering Choongmu-gwanSejong University209 Neungdong-roGwangjin-guSeoul05006Republic of Korea Department of Rangeland and Watershed Management Faculty of Natural ResourcesUniversity of KurdistanSanandajIran

The sub-watershed prioritization is the ranking of different areas of a river basin according to their need to proper planning and management of soil and water *** makers should optimally allocate the investments to critical sub-watersheds in an economically effective and technically efficient ***,this study aimed at developing a user-friendly geographic information system(GIS)tool,Sub-Watershed Prioritization Tool(SWPT),using the Python programming language to decrease any possible *** used geospatial-statistical techniques for analyzing morphometric and topohydrological factors and automatically identifying critical and priority *** order to assess the capability and reliability of the SWPT tool,it was successfully applied in a watershed in the Golestan Province,Northern *** records of flood and landslide events indicated that the SWPT correctly recognized critical *** provided a cost-effective approach for prioritization of ***,the SWPT is practically applicable and replicable to other regions where gauge data is not available for each sub-watershed.

关键词： SWPT Watershed prioritization GIS Effective management

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Monte-Carlo simulation of a stochastic differential equation

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Plasma Science and Technology 2017年第12期19卷 6-14页

作者： Arif ULLAH Majid KHAN M kamran R KHAN 盛正卯 Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026People's Republic of China Department of Physics Quaid-i-Azam University Islamabad Pakistan Department of Physics Institute of Fusion Theory and SimulationsZhejiang UniversityHangzhou 310027People's Republic of China Department of Physics COMSATS Institute of Information TechnologyChack ShahzadIslamabadPakistan Department of Physics Abdul Wali Khan University23200 MardanKPKPakistan

For solving higher dimensional diffusion equations with an inhomogeneous diffusion coefficient,Monte Carlo（MC） techniques are considered to be more effective than other algorithms, such as finite element method or finite difference method. The inhomogeneity of diffusion coefficient strongly limits the use of different numerical techniques. For better convergence, methods with higher orders have been kept forward to allow MC codes with large step size. The main focus of this work is to look for operators that can produce converging results for large step sizes. As a first step, our comparative analysis has been applied to a general stochastic ***, our formulization is applied to the problem of pitch angle scattering resulting from Coulomb collisions of charge particles in the toroidal devices.

关键词： Monte-Carlo simulation stochastic differential equations toroidal plasmas numerical methods

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Facile synthesis of samarium and cerium doped double perovskite cobaltite with enhanced dielectric response

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Journal of Rare Earths 2024年第7期42卷 1317-1327,I0005页

作者： Yasir Abbas M.kamran M.Anis-ur-Rehman Applied Thermal Physics Laboratory Department of PhysicsCOMSATS University IslamabadIslamabad 45550Pakistan

The investigation of Sm-Ce doping on structure,conduction,and dielectric response of Bi_(2)Ca_(2-2x)Sm_(x)CexCoO_(6)(x=0.000,0.025,0.050,0.075)(BCSCCO)are *** the specimens were synthesized by a facile synthesis technique named the co-precipitation route.X-ray diffraction(XRD)reveals that BCSCCO crystallizes into one phase with space group P21/*** crystallite size,dislocation density,lattice parameters,lattice strain,unit cell volume,and bulk density were determined using XRD *** structural properties of Bi_(2)Ca_(2)CoO_(6)were examined using calculations based on the density functional *** and experimental values discrepancy is less than 1%.A scanning electron microscope was used for performing a microstructural *** SEM images demonstrate the homogeneous distribution of grains with a range of sizes(0.054-0.090μm).The alternating current(ac)conductivity,dielectric permittivity,and tangent loss were also studied as a function of frequency(20 Hz-3 MHz)at different temperatures(100-500℃).All synthesized samples were examined using non-linear Debye's function to determine their spreading factor and relaxation *** specimen with the lowest crystallite size(∼23 nm)exhibits a high dielectric permittivity(∼3.80×10^(6)).The conduction mechanism was examined in the studied samples with the use of Jonscher's power *** power law indicates that the BCSCCO(x=0.000,0.025)follows correlated barrier hopping,whereas the x=0.050 and 0.075 compositions follow non-overlapping polaron *** studied specimen Bi_(2)Ca_(1.9)0Sm_(0.05)0Ce_(0.05)_(0)CoO_(6)with the highest density(∼5.65 g/cm^(3))displays a high electrical conductivity(∼46.1 S/cm).These findings correspond to those published for ceramics made from calcium cobaltite using solid-state reactions(5.0-26.0 S/cm).

关键词： Bismuth calcium samarium cerium cobaltite (BCSCCO) Spreading factor Conduction mechanism Rare earths

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An Improved SPSA Algorithm for System Identification Using Fuzzy Rules for Training Neural Networks

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International Journal of Automation and computing 2011年第3期8卷 333-339页

作者： Ahmad T.Abdulsadda kamran Iqbal Smart Micro-Systems Laboratory Electrical and Computer Engineering Michigan State University Department of Systems Engineering University of Arkansas at Little Rock

Simultaneous perturbation stochastic approximation （SPSA） belongs to the class of gradient-free optimization methods that extract gradient information from successive objective function evaluation. This paper describes an improved SPSA algorithm, which entails fuzzy adaptive gain sequences, gradient smoothing, and a step rejection procedure to enhance convergence and stability. The proposed fuzzy adaptive simultaneous perturbation approximation （FASPA） algorithm is particularly well suited to problems involving a large number of parameters such as those encountered in nonlinear system identification using neural networks （NNs）. Accordingly, a multilayer perceptron （MLP） network with popular training algorithms was used to predicate the system response. We found that an MLP trained by FASPSA had the desired accuracy that was comparable to results obtained by traditional system identification algorithms. Simulation results for typical nonlinear systems demonstrate that the proposed NN architecture trained with FASPSA yields improved system identification as measured by reduced time of convergence and a smaller identification error.

关键词： Nonlinear system identification simultaneous perturbation stochastic approximation (SPSA) neural networks (NNs),fuzzy rules multi-layer perceptron (MLP).

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Pro and anti-inflammatory diets as strong epigenetic factors in inflammatory bowel disease

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World Journal of Gastroenterology 2024年第27期30卷 3284-3289页

作者： Adele Rostami Kristen White kamran Rostami Digestive Health Clinic Palmerston North 4410New Zealand Digestive Health Clinic&Kōtare Wellness Ltd Palmerston North 4410New Zealand Department of Gastroenterology Palmerston North HospitalPalmerston North 4442New Zealand

Inflammatory bowel disease(IBD)is the consequence of a complex interplay between environmental factors,like dietary habits,that alter intestinal microbiota in response to luminal antigens in genetically susceptible *** represents an auspicious area for the discovery of how environmental factors influence the pathogenesis of inflammation,prognosis,and response to ***,it relates to gene expression control in response to environmental *** increasing number of patients with IBD globally is indicative of the negative effects of a food supply rich in trans and saturated fats,refined su-gars,starches and additives,as well as other environmental factors like seden-tarism and excess bodyweight,influencing the promotion of gene expression and increasing DNA hypomethylation in *** many genetic variants are now associated with Crohn's disease(CD),new therapeutic strategies targeting modi-fiable environmental triggers,such as the implementation of an anti-inflammatory diet that involves the removal of potential food antigens,are of growing interest in the current ***,as a strong epigenetic factor in the pathogenesis of inflammatory disorders like IBD,provides novel insights into the pathophysio-logy of intestinal and extraintestinal inflammatory disorders.

关键词： Inflammatory bowel disease Epigenetic Anti-inflammatory diet Immunogenetics Microbiome Polymeric diet Elemental diet

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High Voltage Direct Current (HVDC) Transmission: Future Expectation for Pakistan

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CSEE Journal of Power and Energy Systems 2019年第1期5卷 82-86页

作者： kamran Hafeez Shahid A.Khan Electrical Engineering Department CIIT Islamabad campus Pakistan

An HVDC transmission system for bulk power transfer over longer distance offers numerous advantages over an alternating current(AC)transmission system,such as direct integration of networks operating at different frequencies,comparatively low line losses on account of constant current and absence of *** paper presents details about HVDC power transmission systems and power converter *** concerning integration of electrical power generated by alternate sources(i.e.,wind,onshore and offshore)into the national grid of Pakistan using HVDC technology are also *** studies revealed that the energy crisis of countries like Pakistan can be mitigated to a larger extent with the use of HVDC transmission systems.

关键词： HVDC renewable energy transmission systems wind Energy

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Mesoscale eddies and their dispersive environmental impacts in the Persian Gulf

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Chinese Physics B 2020年第8期29卷 363-371页

作者： Amin Raeisi Abbasali Bidokhti Seyed Mohammad Jafar Nazemosadat kamran Lari Faculty of Natural Resources and Environment Science and Research BranchIslamic Azad UniversityTehran ***Iran Geophysics Institute University of TehranTehran ***Iran Department of Water Engineering Oceanic and Atmospheric Research CenterShiraz UniversityShiraz ***Iran Department of Physical Oceanography Faculty of Marine Science and TechnologyTehran North BranchIslamic Azad UniversityTehran ***Iran

As the mesoscale eddies in oceans and semi-enclosed seas are significant in horizontal dispersion of pollutants,we investigate the seasonal variations of these eddies in the Persian Gulf(PG)that are usually generated due to seasonal winds and baroclinic *** sea surface height(SSH)data from 2010 to 2014 of AVISO are used to identify and track eddies,using the SSH-based *** seasonal horizontal dispersion coefficients are estimated for the PG,using the properties of *** results show an annual mean of 78 eddies with a minimum lifetime of one *** of the eddies are predominantly cyclonic(59.1%)and have longer lifetimes and higher diffusion coefficients than the anti-cyclonic *** eddy activity is higher in warm seasons,compared to that of cold *** locations with high eddy diffusion coefficients are high-risk areas by using maps of horizontal eddy diffusion coefficients,perilous times and locations of the release of pollutants are specified to be within the longitude from 51.38°E to 55.28°*** mentioned areas are located from the Strait of Hormuz towards the northeast of the PG,closer to Iranian ***,July can be considered as the most dangerous time of pollution release.

关键词： Persian Gulf mesoscale eddies marine pollution horizontal eddy diffusion coefficient

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The role of the fiber ply configurations on the biomechanics of the hip prosthesis

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International Journal of Modeling, Simulation, and Scientific Computing 2022年第3期13卷 149-160页

作者： kamran Hassani Mohammad Nikkhoo alireza Karimi Department of Biomedical Engineering Science and Research Branch Islamic Azad University TehranIran Department of Ophthalmology and Visual Sciences University of Alabama at Birmingham Birmingham ALUSA

The total hip replacement is the only approved procedure for restoring a degenerated hip joint through *** life span of a prosthesis could depend on the geometry and material properties of the *** study aims to analyze the biomechanics of the carbon/polyetheretherketone(PEEK)composite prosthesis having three different fiber ply configurations compared to traditional stainless steel(SS)*** implant-bone system was established and subjected to a load from the head of the femur and abductor muscle *** stresses and strains in the implant-bone systems were calculated and *** results revealed lower stresses and strains in composite prostheses compared to SS *** fiber ply orientation of the carbon/PEEK composite prosthesis is shown to be a key asset in stress and strain distribution of the 13 implant-bone *** fiber plies which orientated multidirectionally with−45 and+45 degrees exhibited uniform stress and strain *** results suggested the advantage of using composite prostheses in implant designs as they not only invoke lower stresses and strains in the implant-bone system but also amplify the life span of implants in the body.

关键词： Prosthesis hip joint composite stress strain finite element

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Role of interlayer composition in microstructure and mechanical properties during TLP bonding of GTD-111/IN-718 superalloys

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Transactions of Nonferrous Metals Society of China 2022年第3期32卷 908-926页

作者： ali IZADI GHAHFEROKHI Masoud KASIRI-ASGARANI kamran AMINI Mahdi RAFIEI Reza EBRAHIMI-KAHRIZSANGI Advanced Materials Research Center Department of Materials EngineeringNajafabad BranchIslamic Azad UniversityNajafabadIran Center for Advanced Engineering Research Majlesi BranchIslamic Azad UniversityIsfahanIran

An investigation was carried out to assess the applicability of transient liquid phase bonding of two dissimilar super-alloys with different interlayers. The effect of using three types of interlayer such as BNi-2, BNi-3, and BNi-9 on microstructure and mechanical properties was studied in the GTD-111/IN-718 system at 1100 ℃ for different bonding time. To determine the compositional changes and microstructure in the joint region, field emission scanning electron microscopy equipped with energy dispersive spectroscopy was utilized. The formation of Ni_(3)B in the athermally solidified zone(ASZ) is controlled by the B content and, accordingly, the morphology of Ni_(3)Si is governed by the Si content. The Cr content might impede the relocation of B from the interlayer into the base metal and the formation of CrB inside the ASZ is dominated by the Cr content. The high micro-hardness of the eutectic compounds is originated from the formation of boride matrixes such as Ni or Cr boride. The shear strength of the joint using BNi-9 after the completion of isothermal solidification is lower compared that that using BNi-3 and BNi-2, which could be related to the absence of Si in the filler metals constituent and the significant presence of Cr in BNi-9.

关键词： transient liquid phase bonding Ni-based superalloy isothermal solidification Ni-B compounds

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Heat transfer effectiveness characteristics maps for additively manufactured TPMS compact heat exchangers

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Energy Storage and Saving 2022年第3期1卷 153-161页

作者： Moza Alteneiji Mohamed I.Hassan ali kamran A.Khan Rashid K.Abu Al-Rub Advanced Digital&Additive Manufacturing Center United Arab Emirates Department of Mechanical Engineering Khalifa UniversityAbu DhabiUnited Arab Emirates Aerospace Engineering Department Khalifa UniversityAbu DhabiUnited Arab Emirates Mechanical Power Engineering Department Helwan UniversityCairoEgypt(on leave)

Increased power density in modern miniaturized electronics caused difficulty in keeping electronic performance *** challenge leads to the search for high-performance compact heat exchanger as one of the thermal management *** manufactured heat exchangers had limitations that thwart the develop-ment of geometrically complex heat exchangers which are capable of exploiting topological aspects to enhance thermal ***,additive manufacturing(AM)is proposed as a powerful fabrication tech-nique for compact heat exchanger based on the mathematically known triply periodic minimal surfaces(TPMS).In this work,we present 3D compact crossflow heat exchanger computational fluid dynamics(CFD)modelling of geometrically complex structures based on TPMS using STARCCM+CFD ***,CFD modelling is used to obtain new characteristics maps that relate heat transfer effectiveness(Ɛ)and number of transfer units for the proposed heat *** convection heat transfer coefficient,pressure drop,and inlet and outlet fluid temperature are all examined.

关键词： Compact crossflow heat exchanger(CCHE) Additive manufacturing(AM) Triply periodic minimal surface(TPMS) Effectiveness(Ɛ) Number of transfer units(NTU)

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