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Physical,Thermal and Partial Discharge Evaluation of Nano Alumina Filled Silicone Rubber in an Inclined Plane Test

CSEE Journal of Power and Energy Systems 2022年第4期8卷 1242-1249页

作者： m.Tariq Nazir Faizan Tahir Butt Haider Hussain B.Toan Phung Shakeel Akram m.shoaib bhutta Ghulam Yasin School of Engineering RMIT UniversityMelbourneVIC 3000Australiaand the School of Mechanical and Manufacturing EngineeringUniversity of New South Wales SydneyNSW 2052Australia School of Electrical Engineering and Telecommunications University of New South Wales SydneyNSW 2052Australia Institut d'Electronique et des Systès(IES) UMR 5214CNRSUniversitéde Montpellier34095 MontpellierFrance State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing UniversityChonging 400044China State Key Laboratory of Chemical Resource Engineering College of EnergyBeijing University of Chemical TechnologyBeijing 100029China

Silicone rubber(SiR)composite material is a modern-day insulator for high voltage outdoor *** imperfection attributed to SiR is its weak resistance to tracking and erosion when exposed to an outdoor polluted environment which reduces its operational *** paper investigates the performance of SiR with the addition of 0,1,2.5,5,10 and 20%by weight contents of nano alumina(Al_(2)O_(3)).Inclined plane tests are performed according to IEC 60587 using the step up tracking voltage method with an initial voltage of 3.0 kV and the contaminant solution flow rate is maintained at 0.3 ml/min using a peristaltic *** applied voltage level is increased at a rate of 0.25 kV/*** suggest that physical tracking,erosion,RmS leakage current and surface partial discharge(PD)performance of samples is improved with the addition of nano *** tracking length,eroded mass,RmS leakage current and average PD magnitude are measured 22%,79%,30%and 52%lesser in 20 wt%relative to 0 wt%,respectively.A thermal distribution analysis is undertaken with infrared camera and it is discovered that heat is accumulated in the discharge area of the liquid *** maximum temperature on the insulating specimen is decreased with increasing nanofiller *** above promising findings can be due to better thermal stability with low chain mobility at the interaction zone of SiR and ***,less liquid evaporation due to better thermal conduction and improved physical bonding between SiR and nano alumina are possible reasons behind the excellent performance of nanocomposites.

关键词： Alumina(Al_(2)O_(3)) dry band arcing(DBA) inclined plane test(IPT) infrared thermal analysis leakage current partial discharge(PD) silicone rubber(SiR) thermal properties

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Nitriding of Aluminium Alloy in Nitrogen and Nitrogen-Helium mixture Using 100 Hz-Pulsed DC Glow Discharge

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Plasma Science and Technology 2010年第4期12卷 452-460页

作者： Nasrullah KHAN m.shoaib SHAH R.AHmAD Department of Physics GC University

Nitriding of aluminium alloy （***0.8） in nitrogen and nitrogen-helium mixture was carried out by using 100 Hz-pulsed DC glow discharge. Samples are treated for different durations, namely 4 h, 8 h and 12 h, in nitrogen plasma as well as in a mixture of nitrogen- helium plasma for the same processing duration of 4 h. All nitriding treatments are carried out at an input power of 100 W, filling pressure of 1 mbar and substrates temperature of 250~C. X-ray diffraction （XRD） results show an expansion in lattice spacing and consequently shift of diffraction peaks towards lower angle with the addition of helium in nitrogen plasma. Surface morphology of the treated sample is investigated by scanning electron microscopy （SEm） and energy dispersive X-ray analysis （EDX）. Vickers micro-hardness testing results show increases in surface hardness with processing duration as well as with the addition of helium in nitrogen plasmas. This increase of surface hardness may be attributed to the diffusion of nitrogen content in the surface layer generating internal stresses. It is observed that the addition of helium positively affects the nitriding of samples.

关键词： nitrogen-helium mixture plasma nitriding X-ray diffraction surface hardness

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Analytical approach to entropy generation and heat transfer in CNT-nanofluid dynamics through a ciliated porous medium

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Journal of Hydrodynamics 2018年第2期30卷 296-306页

作者： Noreen Sher Akbar m.shoaib Dharmendra Tripathi Shashi Bhushan O.Anwar Bég DBS&H CEME National University of Sciences and Technology School of Natural Sciences National University of Sciences and Technology Department of mechanical Engineering Manipal University medical Energy and Propulsion Engineering Sciences Department of Aeronautical and Mechanical Engineering University of Salford

The transportation of biological and industrial nanofluids by natural propulsion like cilia movement and self-generated contraction-relaxation of flexible walls has significant applications in numerous emerging technologies. Inspired by multi-disciplinary progress and innovation in this direction, a thermo-fluid mechanical model is proposed to study the entropy generation and convective heat transfer of nanofluids fabricated by the dispersion of single-wall carbon nanotubes（SWCNT） nanoparticles in water as the base fluid. The regime studied comprises heat transfer and steady, viscous, incompressible flow, induced by metachronal wave propulsion due to beating cilia, through a cylindrical tube containing a sparse（i.e., high permeability） homogenous porous medium. The flow is of the creeping type and is restricted under the low Reynolds number and long wavelength approximations. Slip effects at the wall are incorporated and the generalized Darcy drag-force model is utilized to mimic porous media effects. Cilia boundary conditions for velocity components are employed to determine analytical solutions to the resulting non-dimensionalized boundary value problem. The influence of pertinent physical parameters on temperature, axial velocity, pressure rise and pressure gradient, entropy generation function, Bejan number and stream-line distributions are computed numerically. A comparative study between SWCNT-nanofluids and pure water is also computed. The computations demonstrate that axial flow is accelerated with increasing slip parameter and Darcy number and is greater for SWCNT-nanofluids than for pure water. Furthermore the size of the bolus for SWCNT-nanofluids is larger than that of the pure water. The study is applicable in designing and fabricating nanoscale and microfluidics devices, artificial cilia and biomimetic micro-pumps.

关键词： metachronal wave single-wall carbon nanotubes (SWCNT) entropy generation porous medium cilia motion heat transfer Bejan number

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Comparative study of Sm^(3+) ions doped phosphate based oxide and oxy-fluoride glasses for solid state lighting applications

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Journal of Rare Earths 2019年第4期37卷 374-382页

作者： m.shoaib G.Rooh R.Rajaramakrishna N.Chanthima N.Kiwsakunkran H.J.Kim J.Kaewkhao S.Tuscharoen Department of Physics Abdul Wali Khan University Center of Excellence in Class Technology and materials Science (CEGm) Nakhon Pathom Rajabhat University Physics Program Faculty of Science and TechnologyNakhon Pathom Rajabhat University Department of Physics Kyungpook National University

The physical and luminescent properties of Sm^(3+)-doped oxide and oxy-fluoride phosphate glasses were investigated. The glass samples with chemical composition of 69 P_2 O_5-10 BaO-10 ZnO-10 Gd_2 O_3-1 Sm_2 O_3 and 69 P_2 O_5-10 BaO-10 ZnO-10 GdF_3-1 Sm_2 O_3 were prepared by conventional melt quenching technique. The prepared glass samples were characterized with density, molar volume, refractive index,FTIR, UV-Vis-NIR, photo luminesce nce, radio luminescence, decay time profile and CIE diagram. The density and refractive index of the oxide glass have higher values as compared to the oxy-fluoride *** FTIR spectra show the reduction of O-H group in oxy-fluoride glass. The characteristic peaks of Sm^(3+)are observed at 360,372,402,438,419,473,944,1077,1227,1373,1474,1529 and 1585 nm in UV-VIS-NIR spectra. These peaks are related respectively to the transitions from ground state ~6 H_(5/2) to ~4 D_(3/2), ~6 P_(7/2),6 P3/2, ~4 I_(11/2), ~6 F_(11/2), ~6 F_(9/2), ~6 F_(7/2),~6 F_(5/2),~6 F_(3/2), ~6 H_(15/2) and ~6 F_(1/2) excited states. From photoluminescence and radio-luminesce nce it is observed that the oxy-fluoride glass samples show better emission intensity than the oxide glass. The Judd-Ofelt theory(J-0 theory) was used to find J-O intensity Ω_λ(λ = 2,4 and 6)parameters and radiative properties such as transition probability, stimulated emission cross section and branching ratios for titled glasses. The trend observed in the J-O parameters is Ω_4 >Ω_2 >Ω_6. The transition probability,emission cross section and branching ratio have the highest values for the ~4 G_(5/2)→~6 H_(7/2)transition. The CIE coordinates of the prepared glass samples are positioned in the orange region and the CCT value is 3776.105 for oxide and oxyfluoride glass. The oxy-fluoride glass has shorter decay time as compared to the oxide glass and it is recorded to be 1.62 and 1.32 ms for oxide and oxy-fluoride respectively. According to the results obtained in this work, it is obvious t

关键词： Oxy-fluoride glass Photoluminescence Judd-Ofelt theory CIE coordinates Rare earths

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基于风机主动控制的风电场低电压穿越能力深度挖掘研究

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中国电机工程学报 2017年第15期37卷 4388-4398页

作者：林湘宁卓毅鑫李正天童宁徐铝洋张伟 m.shoaib Khalid 强电磁与新技术国家重点实验室(华中科技大学) 湖北省武汉市430074

该文基于具备低电压穿越能力的风机在部分电压扰动场景下仍无法成功穿越的场景分析,研究提出风电场内双馈风机可用无功与异步风机无功负荷的协调控制策略。该策略通过列写各风机的电压约束方程并在二维平面上求解可行域,得出最小脱网台... 详细信息

该文基于具备低电压穿越能力的风机在部分电压扰动场景下仍无法成功穿越的场景分析,研究提出风电场内双馈风机可用无功与异步风机无功负荷的协调控制策略。该策略通过列写各风机的电压约束方程并在二维平面上求解可行域,得出最小脱网台数下的无功增发与切机策略,实现多场景电压扰动下风电场低电压穿越能力的进一步挖掘提升,通过对实际风电场的仿真分析,验证了所提策略的有效性。

关键词：风电场低电压穿越能力风机主动控制无功协调减载切机

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一种计及等效损伤载荷约束的风机黏性控制策略

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中国电机工程学报 2018年第7期38卷 1951-1961页

作者：林湘宁丁苏阳张哲原卓毅鑫李正天谭爱国 m.shoaib Khalid Owolabi Sunday Adio 强电磁工程与新技术国家重点实验室(华中科技大学电气与电子工程学院) 湖北省武汉市430074 广西电网公司电力调度控制中心广西壮族自治区南宁市530023

恶劣风况下,风电场将因风机过风速保护相继动作而发生功率陡降甚至风电机组大规模脱网,严重影响电网的安全稳定运行。针对此问题,构建了风电机组的安全运行载荷约束条件,提出一种计及等效损伤载荷约束的黏性控制策略。所提策略能够在不... 详细信息

恶劣风况下,风电场将因风机过风速保护相继动作而发生功率陡降甚至风电机组大规模脱网,严重影响电网的安全稳定运行。针对此问题,构建了风电机组的安全运行载荷约束条件,提出一种计及等效损伤载荷约束的黏性控制策略。所提策略能够在不改变风机原有机械控制系统的基础上,根据运行风况实时调节风机功率,追踪风机等效损伤载荷约束,使载荷维持在相应风况下的安全边界内,在充分利用风机的载荷承受能力的前提下最大化维持风电场功率输出,以实现降低恶劣风况下风电场功率陡降风险的目标。通过算例仿真与策略对比,验证了所提策略的有效性和优越性。

关键词：恶劣风况风机脱网安全边界等效损伤载荷约束黏性控制

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Augmenting IoT Intrusion Detection System Performance Using Deep Neural Network

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Computers, materials & Continua 2023年第1期74卷 1351-1374页

作者： Nasir Sayed muhammad shoaib Waqas Ahmed Sultan Noman Qasem Abdullah m.Albarrak Faisal Saeed Department of Computer Science Islamia College PeshawarPeshawar25120Pakistan Department of Computer Science CECOS University of IT and Emerging SciencesPeshawar25000Pakistan Department of Electrical Engineering HITEC University TaxilaTaxila47080Pakistan Computer Science Department College of Computer and Information SciencesImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia DAAI Research Group Department of Computing and Data ScienceSchool of Computing and Digital TechnologyBirmingham City UniversityBirminghamB47XGUK

Due to their low power consumption and limited computing power,Internet of Things(IoT)devices are difficult to ***,the rapid growth of IoT devices in homes increases the risk of *** detection systems(IDS)are commonly employed to prevent *** systems detect incoming attacks and instantly notify users to allow for the implementation of appropriate *** have been made in the past to detect new attacks using machine learning and deep learning techniques,however,these efforts have been *** this paper,we propose two deep learning models to automatically detect various types of intrusion attacks in IoT ***,we experimentally evaluate the use of two Convolutional Neural Networks(CNN)to detect nine distinct types of attacks listed in the NF-UNSW-NB15-v2 *** accomplish this goal,the network stream data were initially converted to twodimensional images,which were then used to train the neural network *** also propose two baseline models to demonstrate the performance of the proposed ***,both models achieve high accuracy in detecting the majority of these nine attacks.

关键词： Internet of things intrusion detection system deep learning convolutional neural network supervised learning

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Alternate solutions for mine ventilation network to keep a preassigned fixed quantity in a working place

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International Journal of Coal Science & Technology 2015年第4期2卷 269-278页

作者： K. A. El-Nagdy A. m. shoaib Faculty of Petroleum and mining Engineering SuezUniversity Suez 43721 Egypt

In underground constructions, a good ventilation design not only delivers fresh air to establish good working environment, but also provides a scientific and reliable basis to prevent disasters. In emergency cases, unexpected closure of the main airways may occur, providing the workers with alternative airways is substantial. This is important not only to sustain personnel lives, but also to prevent the mine ventilation system from damage. In this research, alternate solutions were introduced in case of failure in the underground construction to keep a pre-assigned fixed quantity in a working place for mine ventilation network. Eight different collapse scenarios were proposed to study their effect on the air quantity distribution among the branches in the ventilation circuit. From these scenarios, it is found that providing a sufficient air quantity in the working places could be achieved through modification of the network topology and adjusting the values of the regulators pressure. It is also indicated that the distance between the collapse and working places has a great effect on the amount of air delivered to it. A reduction in the power consumption could be done by re-arrange the installed regulators and decreasing the number of nodes and branches inside the network. A relationship representing the effect of changing the network topology on the total network power consumption was deduced through regression analysis. It is found that the total network power is quadratic dependent on the number of regulators and number of branches while it is directly dependent on the regulator power.

关键词： mine ventilation network Power consumption through mine ventilation networks Regulators adjustment Nonlinear optimization Air flow control

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Dielectric properties of (Zn)x/CuTl-1223 nanoparticle-superconductor composites

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Journal of Advanced Ceramics 2016年第2期5卷 159-166页

作者： m.mUmTAZ Liaqat ALI shoaib AZEEm Saad ULLAH G.HUSSAIN m.W.RABBANI Abdul JABBAR materials Research Laboratory Department of Physics FBAS International Islamic University(IIU) Islamabad 44000 Pakistan Department of Physics Ghazi University Dera Ghazi Khan 32200 Pakistan

Zinc (Zn) nanoparticles and (Cu0.5Tl0.5)Ba2Ca2Cu3O10−δ (CuTl-1223) superconducting phase were prepared separately by sol-gel and solid-state reaction methods, respectively. Zn nanoparticles were added in CuTl-1223 superconducting matrix with different weight percentage during the final sintering process to obtain (Zn) x /CuTl-1223 (x = 02-4 wt%) nanoparticle-superconductor composites. The effect of Zn nanoparticles on structural, morphological, superconducting, and dielectric properties of CuTl-1223 phase was investigated. The addition of these Zn nanoparticles has not affected the crystal structure of host CuTl-1223 superconducting phase. Superconducting properties were enhanced after the addition of Zn nanoparticles up to certain optimum content (i.e., x = 1 wt%), which were due to improved inter-grain connectivity by healing up of micro-cracks and reduction of defects like oxygen deficiencies, etc. The activation energy (U) was increased after the addition of Zn nanoparticles in CuTl-1223 phase. The dielectric properties of these samples (i.e., dielectric constant, dielectric loss) were determined by experimentally measured capacitance (C) and conductance (G) as a function of frequency at room temperature. The addition of metallic Zn nanoparticles in CuTl-1223 matrix has overall suppressed the dielectric parameters of (Zn) x /CuTl-1223 nanoparticle-superconductor composites. The metallic Zn nanoparticles played a significant role in inter-grain couplings by filling the voids and pores.

关键词： (Zn)x/CuTl-1223 nanoparticle-superconductor composites dielectric properties activation energy

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Nitrogen-doped carbon encapsulated in mesoporous TiO2 nanotubes for fast capacitive sodium storage

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Journal of Energy Chemistry 2021年第4期30卷 202-210页

作者： Baosong Li shoaib Anwer Xinhua Huang Shaohong Luo Jing Fu Kin Liao Department of Aerospace Engineering Khalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Department of mechanical Engineering Khalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates Department of Biomedical Engineering Khalifa University of Science and TechnologyAbu Dhabi127788United Arab Emirates

Controllable synthesis of insertion-type anode materials with beneficial micro-and nanostructures is a promising approach for the synthesis of sodium-ion storage devices with high-reactivity and excellent electrochemical *** this study,we developed a sacrificial-templating route to synthesize TiO_(2)@N-doped carbon nanotubes(TiO_(2)@NC-NTs)with excellent electrochemical *** asprepared mesoporous TiO_(2)@NC-NTs with tiny nanocrystals of anatase TiO_(2) wrapped in N-doped carbon layers showed a well-defined tube structure with a large specific surface area of 198 m^(2) g^(-1) and a large pore size of~5 *** TiO_(2)@NC-NTs delivered high reversible capacities of 158 m A h g^(-1) at 2 C(1 C=335 m A g^(-1))for 2200 cycles and 146 m A h g^(-1) at 5 C for 4000 cycles,as well as an ultrahigh rate capability of up to 40 C with a capacity of 98 m A h g^(-1).Even at a high current density of 10 C,a capacity of 138 m A h g^(-1) could be delivered over 10,000 ***,the synthesis of mesoporous TiO_(2)@NC-NTs was demonstrated to be an efficient approach for developing electrode materials with high sodium storage and long cycle life.

关键词： TiO2 nanotubes moO3 template Nitrogen-doped carbon Anode Sodium-ion battery

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