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Complementary transmissive ultra-thin meta-deflectors for broadband polarization-independent refractions in the microwave region

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Photonics Research 2019年第1期7卷 80-88页

作者： YUEYI YUAN KUANG ZHANG XUMIN DING BADREDDINE RATNI shah nawaz burokur QUN WU Department of Microwave Engineering Harbin Institute of Technology State Key Laboratory of Millimeter Waves LEME UPL Université Paris Nanterre

Polarization manipulation is a significant issue for artificial modulation of the electromagnetic(EM) wave, but general mechanisms all suffer the restriction of inherent symmetric properties between opposite ***, a strategy to independently and arbitrarily manipulate the EM wave with orthogonal circular polarizations based on a metasurface is proposed, which effectually breaks through traditional symmetrical characteristics between orthogonal handedness. By synthesizing the propagation phase and geometric phase, the appropriate Jones matrix is calculated to obtain independent wavefront manipulation of EM waves with opposite circular polarizations. Two transmissive ultra-thin meta-deflectors are proposed to demonstrate the asymmetrical refraction of transmitted circularly polarized waves in the microwave region. Simulated transmitted phase front and measured far-field intensity distributions are in excellent agreement, indicating that the transmitted wave with different polarizations can be refracted into arbitrary and independent directions within a wide frequency band(relative bandwidth of 25%). The results presented in this paper provide more freedom for the manipulation of EM waves, and motivate the realizations of various polarization-independent properties for all frequency spectra.

关键词： Polarization manipulation general mechanisms effectually breaks

Bi-layered coded metasurface for multi-functional hologram with broadband transmission and efficient reflection

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Chinese Optics Letters 2024年第5期22卷 8-16页

作者：朱磊李绪胜董亮谢文静尚关玉 shah nawaz burokur 丁旭旻 School of Computer and Control Engineering Qiqihar UniversityQiqihar 161006China Communication and Electronics Engineering Institute Qiqihar UniversityQiqihar 161006China Heilongjiang Key Laboratory of Big Data Network Security Detection and Analysis Qiqihar UniversityQiqihar 161000China Department of Microwave Engineering Harbin Institute of TechnologyHarbin 150001China LEME UPLUniversitéParis NanterreF92410 Ville d’AvrayFrance Advanced Microscopy and Instrumentation Research Center Harbin Institute of TechnologyHarbin 150080China Key Laboratory of Millimeter Waves Southeast UniversityNanjing 210096China

A multi-functional full-space metasurface based on frequency and polarization multiplexing is *** metasurface unit consists of metallic patterns printed on the two faces of a single-layered dielectric *** unit cell can control electromagnetic wavefronts to achieve a broadband transmission with amplitudes greater than 0.4 from 4.4 to 10.4 ***,at 11.7 GHz and 15.4 GHz,four high-efficiency reflection channels with a reflection amplitude greater than 0.8 are also *** illuminated by linearly polarized waves,five different functions can be realized at five different frequencies,which are demonstrated by theoretical calculations,full-wave simulations,and experimental measurements.

关键词： multi-functional metasurface broadband transmission efficient reflection full space

Versatile metasurface platform for electromagnetic wave tailoring

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Photonics Research 2021年第9期9卷 1650-1659页

作者： RUI FENG BADREDDINE RATNI JIANJIA YI HAILIN ZHANG ANDRÉDE LUSTRAC shah nawaz burokur Key Laboratory of Integrated Services Networks Xidian UniversityXi’an 710071China UniversitéParis-Saclay CNRSCentre de Nanosciences et de Nanotechnologies91120 PalaiseauFrance LEME UPLUniv Paris NanterreF92410 Ville d’AvrayFrance School of Information and Communications Engineering Xi’an Jiaotong UniversityXi’an 710049China UPL Univ Paris NanterreF92410 Ville d’AvrayFrance

The emergence of metasurfaces provides a novel strategy to tailor the electromagnetic response of electromagnetic waves in a controlled manner by judicious design of the constitutive ***,passive metasurfaces tend to perform a specific or limited number of functionalities and suffer from narrow-frequency-band *** reconfigurable metasurfaces can generally be controlled only in a 1D configuration or use p-i-n diodes to show binary phase ***,a 2D reconfigurable reflective metasurface with individually addressable meta-atoms enabling a continuous phase control is proposed in the microwave *** response of the meta-atom is flexibly controlled by changing the bias voltage applied to the embedded varactor diode through an elaborated power supply *** assigning appropriate phase profiles to the metasurface through voltage modulation,complex beam generation,including Bessel beams,vortex beams,and Airy beams,is fulfilled to demonstrate the accurate phase-control capability of the reconfigurable *** simulations and measurements are performed as a proof of concept and show good *** proposed design paves the way toward the achievement of real-time and programmable multifunctional meta-devices,with enormous potential for microwave applications such as wireless communication,electromagnetic imaging,and smart antennas.

关键词： surface. microwave proof

Compact logic operator utilizing a single-layer metasurface

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Photonics Research 2022年第2期10卷 316-322页

作者： Zihan Zhao Yue Wang Xumin Ding Haoyu Li Jiahui Fu Kuang Zhang shah nawaz burokur Qun Wu Advanced Microscopy and Instrumentation Research Center School of Instrumentation Science and EngineeringHarbin Institute of TechnologyHarbin 150080China Department of Microwave Engineering Harbin Institute of TechnologyHarbin 150001China LEME UPLUniv Paris NanterreF92410 Ville d'AvrayFrance

In this paper, we design and demonstrate a compact logic operator based on a single-layer metasurface at microwave frequency. By mapping the nodes in the trained fully connected neural network(FCNN) to the specific unit cells with phase control function of the metasurface, a logic operator with only one hidden layer is physically realized. When the incident wave illuminates specific operating regions of the metasurface, corresponding unit cells are activated and can scatter the incident wave to two designated zones containing logical information in the output layer. The proposed metasurface logic operator is experimentally verified to achieve three basic logic operations(NOT, OR, and AND) under different input signals. Our design shows great application potential in compact optical systems, low-power consumption information transmission, and ultrafast wave-based full signal processing.

关键词： operator layer utilizing

Vibrations of FGM thin cylindrical shells with exponential volume fraction law

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Applied Mathematics and Mechanics(English Edition) 2009年第5期30卷 607-615页

作者： Abdul Ghafar shah Tahir Mahmood Muhammad nawaz Naeem Department of Mathematics The Islamia University of Bahawalpur Department of Mathematics Government College University

In this paper, the influence of an exponential volume fraction law on the vibration frequencies of thin functionally graded cylindrical shells is studied. Material properties in the shell thickness direction are graded in accordance with the exponential law. Expressions for the strain-displacement and curvature-displacement relationships are taken from Love＇s thin shell theory. The Rayleigh-Ritz approach is used to derive the shell eigenfrequency equation. Axial modal dependence is assumed in the characteristic beam functions. Natural frequencies of the shells are observed to be dependent on the constituent volume fractions. The results are compared with those available in the literature for the validity of the present methodology.

关键词： functionally graded material (FGM) vibration cylindrical shell Rayleigh- Ritz method exponential volume fraction law

Improved process monitoring using the CUSUM and EWMA-based multiscale PCA fault detection framework

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Chinese Journal of Chemical Engineering 2021年第1期34卷 253-265页

作者： Muhammad nawaz Abdulhalim shah Maulud Haslinda Zabiri Syed Ali Ammar Taqvi Alamin Idris Department of Chemical Engineering Universiti Teknologi PETRONAS32610 Bandar Seri IskandarPerakMalaysia Centre of Contaminant Control&Utilization(CenCoU) Universiti Teknologi PETRONAS32610 Bandar Seri IskandarPerakMalaysia Department of Chemical Engineering NED University of Engineering&TechnologyKarachi 75270Pakistan Department of Chemical and Engineering Sciences Karlstad UniversityKarlstadSweden

Process monitoring techniques are of paramount importance in the chemical industry to improve both the product quality and plant *** or incipient irregularities may lead to severe degradation in complex chemical processes,and the conventional process monitoring techniques cannot detect these *** this study to improve the performance of monitoring,an online multiscale fault detection approach is proposed by integrating multiscale principal component analysis(MSPCA) with cumulative sum(CUSUM) and exponentially weighted moving average(EWMA) control *** new Hotelling's T~2 and square prediction error(SPE) based fault detection indices are proposed to detect the incipient irregularities in the process *** performance of the proposed fault detection methods was tested for simulated data obtained from the CSTR system and compared to that of conventional PCA and MSPCA based *** results demonstrate that the proposed EWMA based MSPCA fault detection method was successful in detecting the ***,a comparative study shows that the SPEEWMA monitoring index exhibits a better performance with lower values of missed detections ranging from 0% to 0.80% and false alarms ranging from 0% to 21.20%.

关键词： Chemical process system CSTR Fault detection Multiscale Principal component analysis Process monitoring

Vibration characteristics of FGM circular cylindrical shells filled with fluid using wave propagation approach

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Applied Mathematics and Mechanics(English Edition) 2009年第11期30卷 1393-1404页

作者： Zafar Iqbal Muhammad nawaz Naeem Nazra Sultana shahid Hussain Arshad Abdul Ghafar shah Department of Mathematics University of Sargodha Department of Mathematics G. C. University Faisalabad Department of Mathematics University of Sargodha Department of Mathematics The Islamia University of Bahawalpur

The vibration characteristics of a functionally graded material circular cylindrical shell filled with fluid are examined with a wave propagation approach. The shell is filled with an incompressible non-viscous fluid. Axial modal dependence is approximated by exponential functions. A theoretical study of shell vibration frequencies is analyzed for simply supported-simply supported, clamped-simply supported, and clamped-clamped boundary conditions with the fluid effect. The validity and the accuracy of the present method are confirmed by comparing the present results with those available in the literature. Good agreement is observed between the two sets of results.

关键词： functionally graded material Love's shell theory cylindrical shell volumefraction law natural frequency wave propagation

Synthesis and Single Crystal X-ray Studies of 3-(3,5-Bis(trifluoromethyl)phenyl) Quinoline and 3-(4-Fluoro-3-methylphenyl) Quinoline

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Chinese Journal of Structural Chemistry 2014年第1期33卷 90-96页

作者： Malik Aman Ullah Muhammad Adeel Muhammad nawaz Tahir Muhammad Raza shah Irfan Ullah Department of Chemistry Gomal University Department of Physics University of Sargodha ICCBS HEJ Research Institute of ChemistryUniversity of Karachi

The title compounds 3-（3,5-bis（trifluoromethyl）phenyl）quinoline （1） and 3-（4- fluoro-3-methylphenyl）quinoline （2） were synthesized through Suzuki-Miyaura Cross coupling reaction of 3-bromoquinoloine with aryl boronic acids. The title compounds were characterized by single-crystal X-ray diffraction, 1H NMR, 13C NMR, El-MS, elemental analysis and IR. The crystals of 3-（3,5-bis（trifluoromethyl）phenyl）quinoline （C17H9F6N, Mr = 341.25） belongs to the monoclinic system, space group P21n, a = 12.3072（13）, b = 4.9378（6）, c = 24.493（2） A, V= 1473.1（3） A3, Z = 4, Dc = 1.539 Mg m-3, 2 - 0.71073A, μ = 0.144 mm^-1, F（000） = 688, the final R = 0.0715 and wR = 0.1873 for 1875 obserwed reflections with I 〉 2σ（I） and the crystal of 3-（4-fluoro-3- methylphenyl）quinoline （C16H12FN, Mr= 237.27） belongs to the orthorhombic system, space group Pca21, a = 23.794（2）, b = 3.9094（3）, c = 25.669（2） A, V = 2387.7（4） A3, Z = 8, D, = 1.320 Mg m-3, 2 = 0.71073 A, μ = 0.088 mm-1, F（000） = 992, the final R = 0.0534 and wR = 0.1188 for 2270 observed reflections with I 〉 2σ（I）.

关键词： 3-bromoquinoline crystal structure Pd(PPh3)3 boronic acid suzuki coupling

The Strategic Form of Quantum Prisoners' Dilemma

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Chinese Physics Letters 2013年第5期30卷 4-9页

作者： Ahmad nawaz National Centre for Physics Quaid-i-Azam University CampusIslamabad 45320Pakistan

In a normal form, prisoners' dilemma (PD) is represented by a payoff matrix showing players' strategies and payoffs. To obtain the distinguishing trait and strategic form of PD, certain constraints are imposed on the elements of its payoff matrix. We quantize PD by a generalized quantization scheme to analyze its strategic behavior in the quantum domain. The game starts with a general entangled state of the form |ψ>=cos(ξ/2)|00>+sin(ξ/2)|11> and the measurement for payoffs is performed in entangled and product bases. We show that for both measurements, there exist respective cutoff values of entanglement of the initial quantum state up to which the strategic form of the game remains intact. Beyond these cutoffs the quantized PD behaves like the chicken game (CG) up to another cutoff value. For the measurement in the entangled basis the dilemma is resolved for sinξ >1/7 with Q⊗Q as a Nash Equilibrium (NE). However, the quantized game behaves like PD when sinξ >1/3;whereas in the range 1/7

关键词： bases behave strategic