- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (WoW) - Montréal, QC, Canada (2018.6.3-2018.6.7)] 2018 IEEE PELS Workshop on Emerging Technologies: Wireless Power Transfer (Wow) - Analysis of the Effect of the Shielding on Coils in the Wireless Power Transfer System Applied in Trams
摘要： As an important component of Wireless Power Transfer (WPT) system for transmitting energy, the coupler, composed of coils and shielding, is worth studying parameters effect on the system performance. When the WPT system is applied to trams, the primary coupler is installed between two rails, and the secondary coupler is installed at the bottom of the carriages. The magnetic field produced by the coupler has an effect on carriages and rails, which need to be analyzed. In this paper, the influences of coupler parameters on system performance are analyzed. The mathematical model of coupler is found. The measure to improve the metal influences of the vehicle body is put forward, and the correctness of the analysis is verified through preliminary experiments.
关键词： Modern tram,Mathematical Modeling,Wireless Power Transfer,Coupler
更新于2025-09-23 15:23:52
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An analytical method to create patient-specific deformed bone models using X-ray images and a healthy bone model
摘要： Generation of patient-specific bone models from X-ray images is useful for various medical applications such as total hip replacement, implant manufacturing, knee kinematic studies and deformity correction. These models may provide valuable information required for a more reliable operation. In this work, we propose a new algorithm for generating patient-specific 3D models of femur and tibia with deformity, using only a generic healthy bone model and some simple measurements taken on the X-ray images of the diseased bone. Using the X-ray measurements, an interpolation function (a polynomial or a cubic spline) is fit to the mid-diaphyseal curve of the actual bone and the generic bone model is deformed in the guidance of this function with free form deformation method. The created models are intended to be used mainly for the visualization of fixation procedure in software-supported external fixation systems. An error measure is defined to quantify the error in this matching procedure. The method is found to be capable of producing deformed tibia models that satisfactorily reflect the actual bones, as confirmed by two orthopaedic surgeons who use software-supported external fixation systems regularly.
关键词： Deformity,3D bone modeling,Free form deformation,External fixation,Patient-specific bone models,Mathematical modeling
更新于2025-09-23 15:21:21
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Mathematical modeling of heat distribution on carbon fiber Poly(ether-ether-ketone) (PEEK) composite during laser ablation
摘要： Since large amounts of energy are transferred precisely to the material in a very short time, laser and material parameters strongly affect the laser process quality. Mathematical modeling of heat distribution during cavity formation on carbon fiber reinforced PEEK composite material was performed. The temperature distribution equation has been obtained by the Fourier method. At the first stage, 1 J energy laser beam was sent onto the material and the cavity on the composite material was obtained. The constants in the temperature distribution equation obtained by making measurements over the cavity were found. Then the cavities were created with 2, 3 and 4 J laser beams to prove its reliability of the model. The results obtained from the measurement on the cavities and calculated from the temperature distribution equation were compared. Since the unidirectional carbon fibers were used, the obtained cavities have an elliptical shape. Verification experiments were carried out using two different heat conduction constants for in direction along fibers and perpendicular to carbon fibers. Experimental results and the mathematical model are in good agreement.
关键词： Mathematical modeling,Fourier method,Laser ablation,Fiber reinforced composites,Poly(ether-ether-ketone) (PEEK)
更新于2025-09-23 15:21:01
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Propagation of Laser Beams by Decomposition into Gaussian Beamlets
摘要： This paper proposes a method for interpretation of the emotions detected in facial expressions in the context of the events that cause them. The method was developed to analyze the video recordings of facial expressions depicted during a collaborative game played as a part of the Mars-500 experiment. In this experiment, six astronauts were isolated for 520 days in a space station to simulate a flight to Mars. Seven time-dependent components of facial expressions were extracted from the video recordings of the experiment. To interpret these dynamic components, we proposed a mathematical model of emotional events. Genetic programming was used to find the locations, types, and intensities of the emotional events as well as the way the recorded facial expressions represented reactions to them. By classification of different statistical properties of the data, we found that there are significant relations between the facial expressions of different crew members and a memory effect between the collective emotional states of the crew members. The model of emotional events was validated on previously unseen video recordings of the astronauts. We demonstrated that both genetic search and optimization of the parameters improve the accuracy of the proposed model. This method is a step toward automating the analysis of affective expressions in terms of the cognitive appraisal theory of emotion, which relies on the dependence of the expressed emotion on the causing event.
关键词： Appraisal theory of emotion,mathematical modeling of affective interactions,interpretation of affective expressions,Mars-500,second-person perspective
更新于2025-09-19 17:13:59
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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) - Development of N-Type Amorphous and Microcrystalline Hydrogenated Silicon-Oxides (SiOx:H) and Investigation of their Impact as Window Layers on Silicon Heterojunction Solar Cells Device
摘要： This paper proposes a method for interpretation of the emotions detected in facial expressions in the context of the events that cause them. The method was developed to analyze the video recordings of facial expressions depicted during a collaborative game played as a part of the Mars-500 experiment. In this experiment, six astronauts were isolated for 520 days in a space station to simulate a flight to Mars. Seven time-dependent components of facial expressions were extracted from the video recordings of the experiment. To interpret these dynamic components, we proposed a mathematical model of emotional events. Genetic programming was used to find the locations, types, and intensities of the emotional events as well as the way the recorded facial expressions represented reactions to them. By classification of different statistical properties of the data, we found that there are significant relations between the facial expressions of different crew members and a memory effect between the collective emotional states of the crew members. The model of emotional events was validated on previously unseen video recordings of the astronauts. We demonstrated that both genetic search and optimization of the parameters improve the accuracy of the proposed model. This method is a step toward automating the analysis of affective expressions in terms of the cognitive appraisal theory of emotion, which relies on the dependence of the expressed emotion on the causing event.
关键词： interpretation of affective expressions,mathematical modeling of affective interactions,Mars-500,second-person perspective,Appraisal theory of emotion
更新于2025-09-19 17:13:59
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Effect of Drying on Lettuce leaves using Indirect Solar Dryer Assisted with Photovoltaic Cells and Thermal Energy Storage
摘要： The thin layer drying behavior of lettuce leaves was investigated using an indirect pilot solar dryer with thermal energy storage in water, equipped with solar collectors and photovoltaic cells. The drying procedure consisted of shredded lettuce leaves, temperature ≤ 52 °C, airspeed, 1.0 m?s?1, and process time ~10.0 h. Fifteen drying models were adjusted to the experimental data obtained; three models with maximum values of coefficient of determination (R2)—Page, Midilli, and Kucuk, and Weibull Distribution, whose values of R2 ≥ 0.998, and other statistical parameters, χ2, SSE, and RMSE values closer to zero were chosen. The initial browning index BI = 120.5 ± 0.7 decreased compared to the dry sample BI = 78.99 ± 0.5, with chromatic coordinate degradations a* and b*; but not the luminosity L*; where ΔE = 8.26; whose meaning is that the dry sample is a “more opaque brownish color” due to the difference in the chroma ΔC = 6.65, and with a change from the yellow‐green to yellow‐red zone, and a difference in hue angle, Δh° = 14.27, between the fresh and the dried sample. Deff values for shredded lettuce leaves were 1.8 × 10?9 m2 s?1 for values ≤ 52 °C.
关键词： solar drying,lettuce leaves,mathematical modeling,thin layer drying
更新于2025-09-19 17:13:59
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Exergoeconomic analysis of a solar photovoltaic-based direct evaporative air-cooling system
摘要： The target of this work is to perform the exergoeconomic analysis of a solar photovoltaic-based direct evaporative air-cooling system. The system was investigated experimentally with different thicknesses of cellulose and straw pads. For inlet air rates up to 1000 m3/h, the maximum changes in the humidity and temperature of outlet air are achieved by a pad with a thickness of 30 cm. A comprehensive mathematical model was developed for the system and the exergoeconomic analysis of the system was carried out. The influence of the effective parameter on the performance of the system was investigated. For an inlet air with a temperature of 30 °C and relative humidity of 30%, the maximum system exergy efficiency was obtained about 20%. With changes in the water temperature from 15 to 27 °C, inlet air rate from 300 to 1500 m3/h, and inlet air temperature from 26 to 34 °C, the system exergoeconomic factor changes up to 60%. The current system was compared with a conventional system and results showed that for four early years of systems lifetime, the exergoeconomic factor of the conventional system is greater than the solar system due to its lower initial investment, and for later years is lower due to its larger operating cost.
关键词： Cellulose and straw pads,Mathematical modeling,Exergoeconomic analysis,Solar photovoltaic panel,Direct evaporative air-cooling
更新于2025-09-16 10:30:52
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An Algorithm of Mathematical Modeling of Laser-Induced Indirect Thermotherapy of a Baker’s Cyst
摘要： A thermophysical model of heat transfer from a liquid heated by radiation into biological tissues with a cyst of an individual picture of temperature fields, which takes the parameters of laser radiation, as well as the individual thermodynamic and morphometric characteristics of the object of exposure and its syntopy, into account, is proposed. The model is designed for algorithmization of performance of laser-induced indirect thermotherapy of cavity tumors. A comparison was made between the theoretical prediction of the dynamics of temperature changes in the wall of a Baker’s cyst and the experimental data obtained using a thin needle thermocouple placed through a needle in the center of a cyst filled with liquid, whose dimensions had been previously determined by magnetic resonance imaging. It was shown that at the heat transfer coefficient of 3000 W/(m2 K) the proposed model described the heating of the cyst contents due to heat transfer from its inner wall accurately.
关键词： Baker’s cyst,mathematical modeling,laser-induced thermotherapy
更新于2025-09-16 10:30:52
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Increasing the Photocurrent of a Ga(In)As Subcell in Multijunction Solar Cells Based on GaInP/Ga(In)As/Ge Heterostructure
摘要： Spectral characteristics of the Ga(In)As subcell of triple-junction GaInP/Ga(In)As/Ge solar cells have been experimentally and theoretically studied. It is established that the use of a wide-bandgap “window” layer with optimum thickness (100 nm for Ga0.51In0.49P, 110 nm for Al0.4Ga0.6As, and 115 nm for the Al0.8Ga0.2As) in Ga(In)As subcell allows the response photocurrent to be increased by about 0.5 mA/cm2; the change of material in the rear potential barrier of the GaInP subcell from Al0.53In0.47P to p+-Ga0.51In0.49P or AlGaAs allows the short-circuit current of Ga(In)As subcell to be additionally increased by about 0.8 mA/cm2; and the use of a wide-bandgap n++-Ga0.51In0.49P layer instead of n++-GaAs in the tunnel diode increases the photocurrent by about 1 mA/cm2.
关键词： subcell,gallium arsenide,mathematical modeling,photocurrent,solar cell
更新于2025-09-16 10:30:52
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Output error of converse piezoelectric fiber voltage sensor caused by optical fiber factors
摘要： In fiber voltage sensor, imperfect fiber splicing angle and length difference between the sensing fiber and the compensating fiber usually influence the system output performance. This article established the mathematical model of the system output error using the Jones matrix and analyzed the relationship between the system output error and the above two error factors, respectively. The results show that the angle error of 90(cid:2) splice has a significant influence on the system output, and the tolerance of angle error varies with different test voltages. When the test voltage is higher than 6 kV, if the expected system error is less than 0.02%, the splicing angle error should be less than 0.15(cid:2). Additionally, the length difference also has a significant influence on the system output accuracy. The length difference between sensing fiber and compensating fiber should be less than 1 mm when the test voltage is 110 kV so that the system can meet the accuracy requirements of IEC 0.2s. This research provides a reference for the development of fiber voltage sensor based on the converse piezoelectric effect and also provides a basis for the design of intelligent power detection robot system.
关键词： Optical voltage sensor,mathematical modeling,converse piezoelectric effect,output error
更新于2025-09-12 10:27:22