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[IEEE 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - Berlin, Germany (2019.6.23-2019.6.27)] 2019 20th International Conference on Solid-State Sensors, Actuators and Microsystems & Eurosensors XXXIII (TRANSDUCERS & EUROSENSORS XXXIII) - In-Situ Transmission Electron Microscopy Coupled with Resonant Microcantilever for Comprehensive Evaluating Sulfurization Performance of Zinc Oxide Nanowires
摘要： This paper reports a new technique with in-situ transmission electron microscopy (in-situ TEM) and resonant microcantilever to comprehensively evaluate sulfurization performance of ZnO nanowires. Herein, in-situ TEM is used to real-time observe the sulfurization process of ZnO nanowires under SO2-contained atmosphere. temperature-varying micro-gravimetric method, thermodynamic interaction between ZnO nanowires and SO2 molecules is quantitatively evaluated by resonant microcantilever. By exposing the ZnO nanowires sample to SO2-contained atmosphere, a thick shell layer of ZnSO3 can be formed onto the surface of ZnO nanowires and a novel core-shell nanowire structure of ZnO@ZnSO3 is obtained finally. According to our comprehensive evaluation results, the ZnO nanowires sample with 100 nm diameter exhibits high reactive to SO2 molecules and is suitable for SO2 capture and storage.
关键词： sulfurization process,ZnO nanowires,thermodynamic parameter extraction,In-situ TEM
更新于2025-09-23 15:19:57
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[IEEE 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Daejeon, Korea (South) (2019.7.28-2019.8.1)] 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Multimodal and Multifunctional Plasmonic Nanostructures and Techniques
摘要： State-space current control enables high dynamic performance of a three-phase grid-connected converter equipped with an LCL filter. In this paper, observer-based state-space control is designed using direct pole placement in the discrete-time domain and in grid-voltage coordinates. Analytical expressions for the controller and observer gains are derived as functions of the physical system parameters and design specifications. The connection between the physical parameters and the control algorithm enables automatic tuning. Parameter sensitivity of the control method is analyzed. The experimental results show that the resonance of the LCL filter is well damped, and the dynamic performance specified by direct pole placement is obtained for the reference tracking and grid-voltage disturbance rejection.
关键词： Active damping,current control,LCL filter,grid-connected converter,parameter sensitivity,sensorless state feedback
更新于2025-09-23 15:19:57
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Quantum Fisher information of a two-level system controlled by non-Hermitian operation under depolarization
摘要： We investigated the dynamics of quantum Fisher information for a two-level system controlled by a non-Hermitian operation under the depolarization, and the non-Hermitian operation is described by a special Hamiltonian in which both the PT-symmetric zone and the PT-symmetry broken zone are considered. Our results show that the non-Hermitian operation can effectively control the evolutionary behavior of quantum Fisher information of the system. Especially, through a proper choice of the non-Hermiticity parameter combining with the optimal input state and a low depolarizing probability, quantum Fisher information of the system can be significantly increased by the non-Hermitian operation. According to the quantum Cramér–Rao inequality, the inverse of quantum Fisher information provides the lower bound of the error of the parameter estimation. Our investigation also shows that the non-Hermiticity in the operation which is performed on the initial state is robust against the depolarizing decoherence, and the precision of parameter estimation can be remarkably enhanced by applying an appropriate non-Hermitian operation.
关键词： Non-Hermitian dynamics,Quantum Fisher information,Parameter estimation
更新于2025-09-23 15:19:57
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Process development and characterization towards microstructural realization using laser micromachining for MEMS
摘要： This paper presents the process development and characterization towards microstructural realization using laser micromachining for MEMS. Laser micromachining technique is environmental friendly, fast patterning and able to avoid multi steps in conventional lithography based microfabrication techniques. This research focuses on understanding the dimensional properties of materials of the laser beam on the silicon wafers where microstructures were fabricated. Four main parameters like rectangular variable aperture (RVA-XY) size, number of pulse, stage/table feed rate and laser energy play important role in laser ablation process. The pattern of the microchannel or line with 1 cm length was drawn by AutoCAD software or any CAD software. The pattern in the CAD software is then transferred onto the silicon wafer by using laser micromachining. Finally, high power microscope (HPM) and Stylus Profiler will be used as measurement tools for observing and analysing the width and depth of the microchannel structures fabricated by laser micromachining. When using bigger size of RVA, it will lead to bigger microchannel width. There are a little effects or almost comparable in term of microchannel depth if varying all parameters’ value. Surface roughness test also needs to be considered before choosing the best setting for the laser ablation.
关键词： Microstructure,Micromachining,Laser,Parameter
更新于2025-09-23 15:19:57
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A new metaphor-less algorithms for the photovoltaic cell parameter estimation
摘要： The performance of the solar photovoltaic (PV) system can be improved by an accurate modelling of the solar cells, but cell modelling is inaccurate due to the lack of precise solar cell parameters. To model a reliable solar PV cell, the required parameters will not be provided in the manufacturer’s datasheet. Therefore, it’s necessary to estimate the required parameters adequately. Thereby, with this observation, in this paper, proposed a simple multi-objective optimization algorithm to estimate the cell parameters. Various optimization algorithms address this issue; however, most of the algorithms produce suboptimal results due to local minima and premature convergence. So, this paper proposes two simple metaphor-less algorithms named as Rao-2 (R-II), and Rao-3 (R-III) algorithm to estimate the PV cell parameters. The performance of the proposed algorithms is compared with other well-known optimization algorithms to show the pro?ciency of the proposed algorithms. To validate the performance of the proposed algorithms, the estimated parameters are compared with experimental results, including statistical analysis. Moreover, from the results, it can be judged that the proposed algorithms are more suitable for the estimation of three types of solar PV models e?ectively.
关键词： Parameter estimation,PV modelling,Metaphor-less algorithm,Photovoltaic cell
更新于2025-09-23 15:19:57
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Ultra-Short-Term Photovoltaic Power Prediction Based on Self-Attention Mechanism and Multi-Task Learning
摘要： This paper deals with methods for parameter estimation of two-mass mechanical systems in electric drives. Estimates of mechanical parameters are needed in the start-up of a drive for automatic tuning of model-based speed and position controllers. A discrete-time output error (OE) model is applied to parameter estimation. The resulting pulse-transfer function is transformed into a continuous-time transfer function, and parameters of the two-mass system model are analytically solved from the coefficients of this transfer function. An open-loop identification setup and two closed-speed-loop identification setups (direct and indirect) are designed and experimentally compared. The experiments are carried out at nonzero speed to reduce the effect of nonlinear friction phenomena on the parameter estimates. According to results, all three identification setups are applicable for the parameter estimation of two-mass mechanical systems.
关键词： resonant mechanical load,Electric drives,parameter estimation,torsional oscillation
更新于2025-09-23 15:19:57
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Economically sustainable growth of small-scale perovskite manufacturing in alternative PV markets
摘要： This paper proposes a new computational method for retrieving shapes under unpredictable conditions such as when occlusion, geometric distortion, and differences in image resolution occur simultaneously. The human visual system retrieves shapes from incomplete information in the real world, and it has inspired a lot of computational methods of retrieving shapes. In order to retrieve shapes, the observed shapes are decided to be alike or unlike remembered shapes in memory after the comparison of these shapes. To compare the observed and remembered shapes, they must first be appropriately represented so that the points on each shape can be mapped and compared. For this reason, the shape retrieval process needs an appropriate shape representation and shape mapping methods. Moreover, the shape representations should be normalized before the mapping process. However, a normalization process for representations under unpredictable conditions has not yet been established. In this paper, we describe a shape retrieval method that enables us to retrieve shapes under unpredictable conditions with a suitable normalization process. Using curvature partition and angle-length profile, our shape retrieval method normalizes the shape representation before it does the mapping. As a result, unlike the previously proposed methods, it can be used under unpredictable conditions such as when occlusion, geometric distortion, and differences in image resolution occur simultaneously.
关键词： occlusion,Shape recognition,shape retrieval,curvature partition,geometric parameter
更新于2025-09-23 15:19:57
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Effect of pulsed laser parameters on deformation inhomogeneity in laser shock incremental forming of pure copper foil
摘要： The dependence of deformation inhomogeneity on the pulsed laser parameters in laser shock incremental forming (LSIF) of pure copper foil was studied based on finite element simulation. The formed depth, angle, profile and limiting fluctuation value were adopted to evaluate the forming deviation of parts. The digital microscope was employed to examine the bottom surface morphology of formed parts. The effect of pulsed laser energy, spot diameter and overlapping rate on the deformation inhomogeneity in LSIF was investigated. It is revealed that there are variances in the shape and dimension of formed parts along both the shock and travelling directions owing to the local loading history of LSIF. The formed depth and angle are different in various positions of formed parts along the shock direction, while the formed profile presents a periodic variation along the travelling direction. The appropriate enhancement of laser energy can improve the deformation inhomogeneity along both the shock and travelling directions. The deformation profiles along the shock and travelling directions depend on the adopted spot diameter. The rebound effect may occur while too small spot diameter is employed, resulting in the degradation of forming accuracy. The overlapping rate has a major impact on the surface morphology of formed parts. As the overlapping rate increases to 80%, the limiting fluctuation values along the travelling direction become large due to the distortion at the free end. Under the given process conditions, the laser energy of 1100 mJ, the spot diameter of 2.5 mm and the overlapping rate of 60% are recommended to achieve straight-line channels with high forming quality.
关键词： Forming quality,Laser parameter,Deformation inhomogeneity,Numerical simulation,Laser shock incremental forming
更新于2025-09-23 15:19:57
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Full-spectrum periodic nonlinear Fourier transform optical communication through solving the Riemann-Hilbert problem
摘要： An algorithm is proposed for the detection and joint estimation of target parameters for a radar with a two-element rotating antenna. Rotation of the antenna introduces unwanted effects, which may cause inaccuracy in the parameter estimation. Target detection is performed by adding the processed data from two sensors. Joint estimation of range, Doppler, and direction of arrival (DOA) is carried while compensating the effects of antenna rotation. The detection performance is analyzed in terms of the receiver operating characteristics. Analytical expressions of Cramer–Rao Bound for Doppler, the range and DOA are derived. Computational complexity is also discussed. A simulation demonstrates and veri?es the proposed algorithm and its analyses.
关键词： target detection,parameter estimation,rotation compensation,Radar array processing,Cramer-Rao bound
更新于2025-09-23 15:19:57
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Effect of low power laser irradiation on bio-physical properties of wheat seeds
摘要： The production of quality food is indispensable and essential to overcome its global shortage. In order to exercise the facile route to acquire massive production, a laser irradiation treatment method was established. We have investigated the effects of diode laser irradiation on wheat seeds germination, its early growth and biochemical parameters. The variation in germination parameters, caused by laser treatment were monitored carefully. A comparison study was accomplished to examine the laser irradiation effects on treated and control seeds. The red laser indicated an enhancement of 25% in germination percentage, 4.68 cm in shoot length, and 0.64 cm in root length while green laser showed 6.25% less germination percentage than the untreated seeds. Further green laser showed 9.67 cm increase in shoot length, 5.39 cm in root length as compared to untreated seeds. It was found that the seeds which were irradiated with green laser showed an amount of superoxide dismutase (SOD), catalase (CAT) and peroxidase (POD), of 11.9, 10, and 1.53 per mg of protein, respectively as compared to control seeds. Thus, these investigations are promising and suitable for upcoming research on a large scale.
关键词： Wheat,Biochemical parameters,Protein,Germination parameter,Diode laser
更新于2025-09-23 15:19:57