- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Experimental Investigations Conducted for the Characteristic Study of OM29 Phase Change Material and Its Incorporation in Photovoltaic Panel
摘要： The solar photovoltaic (PV) system is emerging energetically in meeting the present energy demands. A rise in PV module temperature reduces the electrical efficiency, which fails to meet the expected energy demand. The main objective of this research was to study the nature of OM29, which is an organic phase change material (PCM) used for PV module cooling during the summer season. A heat transfer network was developed to minimize the experimental difficulties and represent the working model as an electrical resistance circuit. Most existing PV module temperature (TPV) reduction technology fails to achieve the effective heat transfer from the PV module to PCM because there is an intermediate layer between the PV module and PCM. In this proposed method, liquid PCM is filled directly on the back surface of the PV module to overcome the conduction barrier and PCM attains the thermal energy directly from the PV module. Further, the rear side of the PCM is enclosed by tin combined with aluminium to avoid any leakages during phase change. Experimental results show that the PV module temperature decreased by a maximum of 1.2 ?C using OM29 until 08:30. However, after 09:00, the OM29 PCM was unable to lower the TPV because OM29 is not capable of maintaining the latent heat property for a longer time and total amount of the PCM experimented in this study was not sufficient to store the PV module generated thermal energy for an entire day. The inability of the presented PCM to lower the temperature of the PV panel was attributed to the lower melting point of OM29. PCM back sheet was incapable of dissipating the stored PCM’s thermal energy to the ambient, and this makes the experimented PCM unsuitable for the selected location during summer.
关键词： PV module cooling,Thermal absorption,Organic PCM,Thermal dissipation
更新于2025-09-23 15:19:57
-
[IEEE IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Lisbon, Portugal (2019.10.14-2019.10.17)] IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society - Research of the Uncertainty of Measurement Frequencies and Definitions of the Frequency Signal in the Waveguide with Respect to Power
摘要： In this work, a method is proposed for measuring the frequency and frequency deviations of a signal in a waveguide with respect to the power sensors embedded in the waveguide. The report contains expressions for estimating the uncertainty of the obtained measurement results. The ways of optimization of the measuring experiment are shown.
关键词： signal frequency deviation,power dissipation,signal frequency,sensor,waveguide
更新于2025-09-23 15:19:57
-
Design and Analysis of Multilayer Solenoid Coil for Faraday Modulator
摘要： A well-designed polarimeter is integral to the realization of the highly sensitive atomic magnetometer. Amongst various detection schemes, optical polarimetry based on Faraday modulator is most commonly used owing to its angular sensitivity at low-frequency range. The multilayered solenoid coil is the key component of Faraday effect based optical detection system. This paper primarily deals with design and analysis of multilayered coil of Faraday modulator. All deterministic parameters that affect the optimum design have been identified and analyzed. Mathematical expressions have been obtained for axial field homogeneity; modulation depth and power dissipation manifesting direct dependence on coil geometry. The design parameters of the coil are optimized with respect to axial magnetic field homogeneity over region of interest and reduced power losses with suitable geometric construction. The influence of different geometrical and electromagnetic parameters on optimum design has been highlighted and guidelines for design procedure are given. Theoretical results have been compared with simulation and experimental results. The mathematical formulation could be implemented in a computer program for recurrence design and to assist the realization of an optimized design of Faraday modulator coil.
关键词： solenoid coil,Faraday modulator,modulation depth,magnetic field homogeneity,power dissipation
更新于2025-09-23 15:19:57
-
[Communications in Computer and Information Science] VLSI Design and Test Volume 892 (22nd International Symposium, VDAT 2018, Madurai, India, June 28-30, 2018, Revised Selected Papers) || Performance Analysis of Graphene Based Optical Interconnect at Nanoscale Technology
摘要： In the modern technology era, interconnect is the key element for designing integrated circuits that provides on-chip and off-chip communication path for various systems. The primary challenges for modeling interconnect are reduced propagation delay, power dissipation, and its power delay product at advanced technology. This paper critically addresses the performance of optical interconnects using equivalent electrical model that comprises of different composite materials. Using industry standard HSPICE, the propagation delay and power dissipation characteristics of graphene nanoribbon have been compared with other composite materials. It has been observed that the propagation delay for graphene nanoribbon can be improved by 99.91% as compared to other composite materials. The power delay product of the proposed graphene based interconnect model is 59.73% lesser compared to other composite materials at 22 nm technology node.
关键词： Power delay product (PDP),Graphene nanoribbons,Propagation delay,Optical interconnect,Power dissipation
更新于2025-09-19 17:15:36
-
[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) - The Journey from Manipulating Single Quantum Systems to Quantum Information Processing
摘要： The quality factor of a resonator represents the decay of vibrational energy over time, and is directly related to the frequency response and other key parameters that determine performance of inertial sensors and oscillators. Accurate prediction of the quality factor is essential for designing high-performance microelectromechanical (MEMS) devices. Several to the quality factor. Due to computational complexity, highly simplified models for the dominant dissipation mechanism, such as Zener’s model for thermoelastic dissipation (TED), are often the intuition provided by these models employed. However, is inadequate to predict the quality factor of more complex designs and can be highly misleading. In this paper, we construct complete, quantitative, and predictive models with finite-element methods for the intrinsic energy dissipation mechanisms in MEMS resonators using full anisotropic representation of crystalline silicon and the temperature dependence of all parameters. We find that TED is often a more significant source of damping than has been assumed, because of the previously neglected role of crystalline anisotropy and small geometric features, such as etch release holes—all of which can now be included in practical models. We show that these models, along with simpler scaling models for extrinsic dissipation mechanisms, explain measurements of quality factor in diverse sets of MEMS resonators with unprecedented accuracy.
关键词： internal friction,frequency response,micromechanical resonators,microelectromechanical devices,thermal-mechanical coupling,thermoelastic dissipation,geometry,resonance,systems,Capacitive sensors,damping,energy dissipation,frequency-domain analysis
更新于2025-09-19 17:13:59
-
[IEEE 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Rome, Italy (2019.6.17-2019.6.20)] 2019 PhotonIcs & Electromagnetics Research Symposium - Spring (PIERS-Spring) - Electro-thermal Model of Approximated Organic Tissue for Investigation of Harmful Electrosurgical Impacts
摘要： The quality factor of a resonator represents the decay of vibrational energy over time, and is directly related to the frequency response and other key parameters that determine performance of inertial sensors and oscillators. Accurate prediction of the quality factor is essential for designing high-performance microelectromechanical (MEMS) devices. Several to the quality factor. Due to computational complexity, highly simplified models for the dominant dissipation mechanism, such as Zener’s model for thermoelastic dissipation (TED), are often the intuition provided by these models employed. However, is inadequate to predict the quality factor of more complex designs and can be highly misleading. In this paper, we construct complete, quantitative, and predictive models with finite-element methods for the intrinsic energy dissipation mechanisms in MEMS resonators using full anisotropic representation of crystalline silicon and the temperature dependence of all parameters. We find that TED is often a more significant source of damping than has been assumed, because of the previously neglected role of crystalline anisotropy and small geometric features, such as etch release holes—all of which can now be included in practical models. We show that these models, along with simpler scaling models for extrinsic dissipation mechanisms, explain measurements of quality factor in diverse sets of MEMS resonators with unprecedented accuracy.
关键词： micromechanical resonators,energy dissipation,Capacitive sensors,frequency-domain analysis,damping,frequency response,geometry,thermal-mechanical coupling,resonance,thermoelastic dissipation,internal friction,microelectromechanical devices,systems
更新于2025-09-19 17:13:59
-
Thermal analysis and heat dissipation improvement for quantum cascade lasers through experiments, simulations, and structure function
摘要： We quantified the thermal resistance of quantum cascade lasers (QCLs) using their structure functions and increased the laser output by employing ridge structures in which thermal resistance was reduced. To improve heat properties, three different QCL devices were prepared as follows. One was a device whose ridge was covered with SiO2, another was a device whose ridge was embedded with Au, and the other was a device whose ridge was embedded with Cu. The temperature distributions were measured with a thermoviewer and were analyzed with three-dimensional simulations. From the results, improved heat dissipation by embedding the ridge was clarified. Furthermore, the structure functions obtained by static mode measurement suggested that the thermal resistance was improved from 9.3 to 6.5 K W?1 by embedding the ridge. As a result of the improvement, the QCL with the Au-embedded ridge had a 1.5-fold higher laser power than the QCL with the SiO2-covered ridge.
关键词： thermal resistance,laser output,heat dissipation,structure function,quantum cascade lasers
更新于2025-09-19 17:13:59
-
[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) - Slow Light to Reduce the Energy Dissipation of Mach-Zehnder Modulators in Silicon Photonics
摘要： Integrated Mach-Zehnder (MZ) modulators are important components in silicon photonic devices that rely on a reverse-biased p-n junction to modulate the optical signal via a change of the waveguide refractive index. Reducing their energy consumption is a crucial step towards the application of silicon photonics, especially in connection with the growing traffic volumes in data centers. In this work, we combine band-edge slow light structures consisting of silicon grating waveguides with periodic (interlaced) p-n junctions to maximize spatial matching between the optical field mode and the depletion region of the p-n junction. The two effects together will result in an improved modulation efficiency, leading to a strongly reduced energy dissipation per bit.
关键词： Energy Dissipation,Silicon Photonics,Slow Light,Mach-Zehnder Modulators
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Study on Temperature Rise Characteristic of LED Lighting Fixture under Different Conditions
摘要： The temperature rise characteristic of LED lighting fixture under different conditions was studied in the paper. The experimental results showed that the temperature rise of LED lighting fixture under the condition of with cover and no dust was about 1.5 times higher than that of LED lighting fixture under the condition of no cover and with dust. Apparently, the influence of the cover on the heat dissipation of LED lighting fixture was much larger than the dust.
关键词： Cover,Thermal Resistance,Temperature Rise,Heat Dissipation,LED lighting fixture,Dust
更新于2025-09-16 10:30:52
-
Non-monotonic dependence of fluid dissipation on fluid density in fluid-coupled nanoresonators
摘要： Recent studies on ?uid-coupled nanoresonators (represented by argon-?lled carbon nanotubes or CNTs) have shown nonintuitive variation of the ?uid dissipation (D?u) with ?uid density (q(cid:2)) at high-frequency oscillations. In this letter, we propose a physical mechanism that can explain such a behavior. We identify that argon atoms are in the disordered (ordered) state within the CNTs at small (large) q(cid:2). For low-frequency oscillations, i.e., for oscillations with large characteristic excitation time scales, the argon atoms, at both large and small q(cid:2), have enough time to dissipate all the energy added from the imposed oscillations. But for high-frequency oscillations, i.e., for oscillations with small characteristic excitation time scales, while the argon atoms in the disordered state (low density) can dissipate all the energy in that small time, those in the ordered state (high density) cannot dissipate all the energy (and hence stores some energy) in that time. This explains the nonmonotonic density-dependence of D?u in argon-?lled CNTs at high frequency. We also explain this nonmonotonic density-dependence of D?u from the corresponding Deborah number (De). De represents the ratio of the ?uid relaxation to the excitation time scales. The relaxation time of CNT-con?ned argon increases with q(cid:2). Therefore, for a large-frequency (or a small excitation time) oscillation, De becomes large and the ?uid starts losing its ?uidity and shows solidlike (“elastic”) characteristics. This viscoelastic behavior ensures a partial storage (without dissipation) of the imposed oscillation, which in turn explains the nonmonotonic variation of D?u with q(cid:2) for large-frequency oscillations.
关键词： viscoelastic behavior,fluid density,fluid dissipation,nanoresonators,Deborah number
更新于2025-09-12 10:27:22