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基于CFD的具有首翼的新型飞翔形式AUV升力和阻力估计:对阻力极曲线和推力估计的见解

哈尔滨工程大学学报（英文版） 2024年第2期23卷 352-365页

作者： faheem ahmed Xianbo Xiang Haotian Wang Gong Xiang Shaolong Yang School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology1037Luoyu RoadWuhan 430074China State Key Laboratory of Intelligent Manufacturing Equipment and Technology Huazhong University of Science and Technology1037Luoyu RoadWuhan 430074China

To achieve hydrodynamic design excellence in Autonomous Underwater Vehicles(AUVs)largely depends on the accurate prediction of lift and drag *** study presents Computational Fluid Dynamics(CFD)-based lift and drag estimations of a novel torpedo-shaped flight-style AUV with *** horizontal bow-wings are provided to accommodate the electromagnetic arrays used to perform the cable detection and tracking operations near the *** hydrodynamic performance of the AUV due to addition of these horizontal bow-wings is required to be investigated,particularly at the initial design ***,CFD techniques are employed to compute the lift and drag forces observed by the flight-style AUV,maneuvering underwater at different angles of attack and varying *** Reynolds-Averaged Navier-Stokes Equations(RANSE)closure is achieved by employing the modified k-ϵ model and Two-Scale Wall Function(2-SWF)approach is used for boundary layer ***,the study also highlights the unique mesh refinement and solution-adaptive meshing techniques to perform the CFD simulations in Solidworks Flow Simulation(SWFS)*** drag polar curve for flight-style AUV with and without bow-wings is generated using the computed lift and drag *** curve provided essential insights for achieving hydrodynamically efficient and optimized AUV *** the drag polar curve,it is revealed that due to horizontal bow-wings,the flight-style AUV is capable to generate higher lift with less drag and thus,it gives better lift-to-drag ratio compared to the AUV without ***,simulated results of axial drag observed by the AUV have also been compared with free-running experimental results and are found in good agreement.

关键词： Autonomous underwater vehicle(AUV) Computational fluid dynamics(CFD) Solidworks flow simulation(SWFS) Drag polar curve Free-running experiments

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Electrochemical performance of a symmetric supercapacitor device designed using laser-induced multilayered graphene

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新型炭材料(中英文) 2024年

作者： Gargi Dhiman Kavita Kumari Bon-Heun Koo faheem ahmed Nagih M.Shaalan Saurabh Dalela Parvez A.Alvi Ranjeet Kumar Brajpuriya Shalendra Kumar Department of Physics School of Advanced EngineeringUPES Industrial Technology Research Institute Changwon National University Changwon Department of Applied Sciences and Humanities Faculty of Engineering and Technology Jamia Millia Islamia Department of Physics College of Science King Faisal University Physics Department Faculty of Science Assiut University Department of Pure & Applied Physics University of Kota Department of Physical Science

This study demonstrates a facile and economical approach for fabricating laser-induced graphene（LIG）, which results in improved electrochemical performance. Polyimide polymer was used as a starting material for LIG synthesis and irradiated under ambient conditions using a CO2laser. The prepared LIG samples were characterized by Raman spectroscopy and FTIR, which validated the formation of multilayered graphene containing sp2 hybridized C=C bonds. The FE-SEM revealed three-dimensional sheetlike structures, while HR-TEM images displayed lattice planes with an interplanar spacing of approximately 0.33 nm, corresponding to the（002） plane of graphene. The electrochemical performance of the as-prepared LIG samples demonstrated a remarkable areal specific capacitance（CA） of 51 mF cm-2(170 F g-1) at 1 mA cm-2(3.3 A g-1) in a three-electrode configuration with 1M KOH as the aqueous electrolyte. The LIG electrodes produced an energy density of ～3.5 μWh cm-2and a power density of ～350 μW cm-2,demonstrating significant energy storage capabilities. Additionally, the electrodes exhibited excellent cyclic stability, retaining 87%of their specific capacitance after 3 000 cycles at 1 mA/cm2. The symmetric supercapacitor fabricated with LIG electrodes and the tested 1M KOH electrolyte showed a specific capacitance of 23 mF cm-2and maintained excellent retention after 10,000 cycles,showing LIG's potential for supercapacitor applications.

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Critical Success Factors to Improve the Game Development Process from a Developer＇s Perspective

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Journal of Computer Science & Technology 2016年第5期31卷 925-950页

作者： Saiqa Aleem Luiz Fernando Capretz faheem ahmed College of Technological Innovation Zayed University Abu Dhabi 144534 United Arab Emirates Department of Electrical and Computer Engineering Western University Ontario N6A 5B9 Canada Department of Computing Science Thompson Rivers University Kamloops BC V2C OC8 Canada

The growth of the software game development industry is enormous and is gaining importance day by day. This growth imposes severe pressure and a number of issues and challenges on the game development community. Game development is a complex process, and one important game development choice is to consider the developer＇s perspective to produce good-quality software games by improving the game development process. The objective of this study is to provide a better understanding of the developer＇s dimension as a factor in software game success. It focuses mainly on an empirical investigation of the effect of key developer＇s factors on the software game development process and eventually on the quality of the resulting game. A quantitative survey was developed and conducted to identify key developer＇s factors for an enhanced game development process. For this study, the developed survey was used to test the research model and hypotheses. The results provide evidence that game development organizations must deal with multiple key factors to remain competitive and to handle high pressure in the software game industry. The main contribution of this paper is to investigate empirically the influence of key developer＇s factors on the game development process.

关键词： developer's perspective software game empirical investigation good-quality game game development process,game developer's factor

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Day-ahead allocation of operation reserve in composite power systems with large-scale centralized wind farms

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Journal of Modern Power Systems and Clean Energy 2016年第2期4卷 238-247页

作者： Jianxue WANG ahmed faheem ZOBAA Chengchen HUANG Chen CHEN School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China College of Engineering Design and Physical SciencesBrunel University LondonUxbridgeMiddlesex UB83PHUK

This paper focuses on the day-ahead allocation of operation reserve considering wind power prediction error and network transmission constraints in a composite power system.A two-level model that solves the allocation problem is *** upper model allocates operation reserve among subsystems from the economic point of *** the upper model,transmission constraints of tielines are formulated to represent limited reserve support from the neighboring system due to wind power *** lower model evaluates the system on the reserve schedule from the reliability point of *** the lower model,the reliability evaluation of composite power system is performed by using Monte Carlo simulation in a multi-area *** power prediction errors and tieline constraints are *** reserve requirements in the upper model are iteratively adjusted by the resulting reliability indices from the ***,the reserve allocation is gradually optimized until the system achieves the balance between reliability and economy.A modified two-area reliability test system (RTS) is analyzed to demonstrate the validity of the method.

关键词： Composite system reliability Reserve allocation Wind power fluctuation Operation reserve

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Green Synthesis of Silver Nanoparticles and Their Reduced Graphene Oxide Nanocomposites as Antibacterial Agents:A Bio-inspired Approach

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Acta Metallurgica Sinica(English Letters) 2017年第1期30卷 45-52页

作者： Edreese Alsharaeh Sarah Alazzam faheem ahmed Nishat Arshi Mohammed Al-Hindawi Garwin Kim Sing College of Science & General Studies Alfaisal UniversityRiyadhSaudi Arabia

In this paper, silver nanoparticles （AgNPs） and AgNPs/reduced graphene oxide （RGO） nanocomposites were prepared using lemon juice under microwave irradiation （MWI） and UV light irradiation. AgNPs with face-centered cubic structure RGO peaks were observed by X-ray diffraction. The UV-Vis spectrum showed modifications in the absorption peaks of the AgNPs with the concentration of the precursor solution and irradiation time, and the optimized condition was obtained for 20 min MWI and 60 s of UV light. Raman analysis confirmed the presence of RGO as D and G bands in the spectrum. Transmission electron microscopy analyses confirmed that the AgNPs of size ranging from 3 to 8 nm were anchored onto the RGO sheets. The antibacterial properties of the AgNPs/RGO nanocomposites were investigated using gram-negative bacteria. The results revealed that AgNPs/RGO nanocomposites consisting of approximately 5 wt% AgNPs can achieve antibacterial performance similar to that of neat AgNPS. This method can be useful for the applications of AgNPs-based nanocomposites, where minute amount of silver will be utilized.

关键词： Silver nanoparticles (AgNPs) Nanocomposites Reduced graphene oxide Antibacterial

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Bioinspired Multi-material Polyjet-printed Frog Robot for Synchronous and Asynchronous Swimming

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Journal of Bionic Engineering 2023年第3期20卷 923-933页

作者： Afaque Manzoor Soomro Jae-Wook Lee Fida Hussain Memon faheem ahmed Kashif Hussain Kyung Hyun Choi Department of Mechatronics Engineering Jeju National UniversityJeju63243South Korea Department of Electrical Engineering Sukkur IBA UniversitySukkur65200Pakistan

This paper proposes the bioinspired soft frog robot. All printing technology was used for the fabrication of the robot. Polyjet printing was used to print the front and back limbs, while ultrathin filament was used to print the body of the robot, which makes it a complete soft swimming robot. Dual thrust generation approach has been proposed by embedding the main muscle and antagonistic muscle in all the limbs, which enables it to attain high speed (18 mm/s), significant control to swim in dual mode (synchronous and asynchronous modes). To achieve the swimming motion of frog, four SMA (BMF 300) muscle wires were used. The frog robot is named as (FROBOT). The hind limbs are 60 mm long and 10 mm thick on average, while the front limbs are 35 mm long and 7 mm thick. Model-based design and rigorous analysis of the dynamics of real frogs have allowed FROBOT to be developed to swim at a level that is remarkably consistent with real frogs. Electrical and mechanical characteristics have been performed. In addition, the test data were further processed using TRACKER to analyze angle, displacement and velocity. FROBOT (weighs 65 g) can swim at different controllable frequencies (0.5–2 Hz), can rotate in any direction on command from custom built LabVIEW software allowing it to swim with speed up to 18 mm/s on deep water surface (100 cm) with excellent weight balance.

关键词： Bioinspired Soft robotics Frog FROBOT Asynchronous swimming

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Multi-material Bio-inspired Soft Octopus Robot for Underwater Synchronous Swimming

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Journal of Bionic Engineering 2022年第5期19卷 1229-1241页

作者： faheem ahmed Muhammad Waqas Bushra Shaikh Umair Khan Afaque Manzoor Soomro Suresh Kumar Hina Ashraf Fida Hussain Memon Kyung Hyun Choi Department of Mechatronics Engineering Jeju National UniversityJeju 63243South Korea Department of Electrical Engineering Sukkur IBA UniversityAirport RoadSukkur 65200SindhPakistan Advanced Micro Mechatronics and Energy Lab Sukkur IBA UniversitySukkur 65200Pakistan Department of Ocean Sciences Jeju National UniversityJeju 63243South Korea

Inspired by the simple yet amazing morphology of the Octopus, we propose the design, fabrication, and characterization of multi-material bio-inspired soft Octopus robot (Octobot). 3D printed molds for tentacles and head were used. The tentacles of the Octobot were casted using Ecoflex-0030 while head was fabricated using relatively flexible material, i.e., OOMOO-25. The head is attached to the functionally responsive tentacles (each tentacle is of 79.12 mm length and 7 void space diameter), whereas Shape Memory Alloy (SMA) muscle wires of 0.5 mm thickness are used in Octobot tentacles for dual thrust generation and actuation of Octobot. The tentacles were separated in two groups and were synchronously actuated. Each tentacle of the developed Octobot contains a pair of SMA muscles (SMA-α and SMA-β). SMA-α muscles being the main actuator, was powered by 9 V, 350 mA power supply, whereas SMA-β was used to provide back thrust and thus helps to increase the actuation frequency. Simulation work of the proposed model was performed in the SolidWorks environment to verify the vertical velocity using the octopus tentacle actuation. The design morphology of Octobot was optimized using simulation and TRACKER software by analyzing the experimental data of angle, displacement, and velocity of real octopus. The as-developed Octobot can swim at variable frequencies (0.5–2 Hz) with the average speed of 25 mm/s (0.5 BLS). Therefore, the proposed soft Octopus robot showed an excellent capability of mimicking the gait pattern of its natural counterpart.

关键词： Bio-inspired Octopus Octobot Sub-surface Soft robotics Swimming

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Effect of sintering temperature on structure, magnetic and magnetocaloric properties of La_(0.6)Ca_(0.4)MnO_3 manganite

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 141-145页

作者： Seung Rok LEE M.S.ANWAR faheem ahmed Bon Heun KOO School of Materials Science and Engineering Changwon National University

The effect of sintering temperature on the structure, magnetic transition and magnetic entropy of La0.6Ca0.4MnO3 manganite was studied. It was observed that this compound belongs to the orthorhombic structure with the Pnma space group without any impurity phase. The effect of sintering temperature on the Curie temperature(TC) was studied. The small increment in TC is found with increasing the sintering temperature. The magnetocaloric study exposes a quite large change of the magnetic entropy, which varies with sintering temperature. For an applied magnetic field of 3 T and sintering temperature of 1300 °C, the relative cooling power(RCP) is 89 J/kg. As a result, the studied compound can be considered as potential material for magnetic refrigeration near and below room temperature.

关键词： manganite magnetocaloric effect sintering temperature colossal magnetoresistance

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Construction of Vectors to Suppress Photorespiratory Pathway in Wheat and Reviews of Recombinant Protein Expression Technologies

Construction of Vectors to Suppress Photorespiratory Pathway...

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作者： faheem ahmed KHAN 华中农业大学

学位级别：硕士

Life on earth is sustained by a process of Photosynthesis. Plants utilise visible light spectra to produce biomass. Our environment is constantly changing which requires the photosynthetic machinery to work in more vigorous way to adopt itself to upcoming challenges of severe biotic and abiotic nature. To cope with these challenges, plant scientists are constantly working on the ways to enhance the photosynthetic activity. Photorespiration which fixes O2and releases CO2in C3plants is the competing pathway with photosynthesis. One of the method to increase yield is to enhance photosynthesis through engineering photorespiratory pathway. A number of efforts have been carried out in this pursuit resulting in three engineered photorespiratory pathways to date, out of which two have been proven experimentally in model plant, Arabidopsis. These approaches may prove useful for field crops in future environment of more hostile nature. To experimentally prove this in wheat, six vectors are constructed expressing AtGDH, GCL and TSR aiming to install a novel pathway in wheat to supress photorespiration by gene gun. These vetors are PXJC-Ubi-TaCTP-GDH, PXJC-Ubi-HvCTP-GCL, PXJC-Ubi-ZmCTP-TSR, PXJC-Cmps-TaCTP-GDH, PXJC-Cmps-HvCTP-GCL, PXJC-Cmps-ZmCTP-TSR. These vectors are mainly divided into two groups based on Promoter. One group contain Ubiquitin promoter which is a strong promoter and shows very good results in wheat. The other one is with Cmps promoter. Three genes namely AtGDH, GCL, and TSR involved in novel pathway are codon optimised to wheat and synthesized synthetically. Additionally to make these genes express in Chloroplast different Chloroplast transit peptides from wheat barley and maize are used. These were then cloned in PXJC-Ubi-Upmi and PXJC-Cmps-Upmi vectors （Molecular Biotechnology Laboratory for Triticeae Crops）. The plasmid as a whole or Clean Cassete can be used in gene gun transformation of wheat. A review is made on recent developments in protein expres

关键词：小麦蛋白质表达亚单位疫苗基因转化

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Facile synthesis of single-crystalline rutile TiO_2 nano-rods by solution method

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Transactions of Nonferrous Metals Society of China 2014年第S1期24卷 152-156页

作者： Rehan DANISH faheem ahmed Nishat ARSHI M.S.ANWAR Bon Heun KOO School of Nano and Advanced Materials Engineering Changwon National University

A convenient and scalable technique for the synthesis of rutile titanium dioxide(TiO2) nano-rods was presented by using bulk TiO2 powder, sodium hydroxide(NaOH) and distilled water as raw materials. X-ray diffraction(XRD) and field emission scanning electron microscopy(FESEM) studies indicate that the prepared sample is crystalline and free from any impurities, however, it has no distinct shape and possesses a huge degree of agglomeration, and the average crystal size is around 40 nm. After annealing the sample at 600 °C for 2 h, it is observed through FESEM that nano-rods are formed. And XRD analysis shows that the nano-rods are single crystalline with distinct and smooth surfaces in different sizes with average length of about 1 μm and diameter of about 80 nm. Further UV-visible spectroscopy and Raman studies were conducted for the prepared sample and the band gap of the final product is found to be 3.40 eV.

关键词： TiO2 nanorods solution method crystal growth rutile

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