- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Gramado, Brazil (2019.9.15-2019.9.18)] 2019 IEEE PES Innovative Smart Grid Technologies Conference - Latin America (ISGT Latin America) - Financial Impact of the Binomial Tariff in the Investment in Residential Photovoltaic Systems
摘要： The design of a sensitivity improved dual diaphragm based vibrating wire transducer for sensing pneumatic pressure is proposed. The improvement achieved in sensitivity of a dual diaphragm structure over the single diaphragm category is veri?ed through experiments. An experimental setup for ef?ciently assessing the dynamic performances of the pressure transducers is presented. Eventually, the improved sensitivity concedes improvement in precision and resolution of the instrument. While the vibrating wire transducer based pressure sensors always show better dynamic performances over others, the present dual diaphragm structure offers improved sensitivity, which adds to their dynamic performances and overall performance characteristics.
关键词： sensitivity improvement,time constant measurement,Diaphragm structure,dynamic pressure sensor
更新于2025-09-23 15:21:01
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[IEEE 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Sozopol, Bulgaria (2019.9.6-2019.9.8)] 2019 IEEE 8th International Conference on Advanced Optoelectronics and Lasers (CAOL) - Local Laser Heating of Biological Tissue
摘要： The mathematical model of the process of heating of biological media by continuous and pulsed laser radiation was created and investigated. The dimensions of the heated area, the time of heating are determined. It is necessary use blue or green laser radiation for creating a local area. The thermal time constant of the process is a few minutes. Therefore, the radiation of the pulse-modulated radiation differs from the constant power only with periodic of pulses more than 1 minute.
关键词： size,biological tissue,time constant,heating,radiation,laser
更新于2025-09-19 17:13:59
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Diagnostic method of solar thermal system based on the short time on-line measurements
摘要： This paper presents the method of a solar heating system diagnostics allowing determination of the following coefficients in operating conditions: heat loss coefficient ULK, collector efficiency factor F’ and heat removal factor FR related to the collector static properties, effective heat capacity (mc)e and time-constant Tz related to the collector dynamic properties. The proposed method is based on a comparison of two models: analytical and numerical. The analytical model was developed based on the collector energy balance and that combining characteristic parameters. The numerical model was developed based on the recorded operating data of the medium inlet and outlet temperature, and solar irradiance. The condition necessary to apply this method covers constant volume flow rate of the medium in the system during the experiment.
关键词： time-constant,parametric identification,solar collector,efficiency characteristics
更新于2025-09-10 09:29:36
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[IEEE 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Paris, France (2018.7.8-2018.7.13)] 2018 Conference on Precision Electromagnetic Measurements (CPEM 2018) - Progress on Simple Resistance Standard with Calculable Time Constant
摘要： This paper describes the progress on the development of the simple calculable bifilar resistors with nominal resistance below 100 W. The resistor have very simple and cheap construction that can be easily replicated. It is based on the ordinary circular cross-section resistance wire with enamel layer. Detailed characterization of the wire was made and thus the expanded uncertainty (k = 2) of the resistance is as low as 34 μW/W at 1 MHz. The expanded uncertainty of the time constant is below 0.11 ns (680 μrad/MHz).
关键词： impedance measurement,time constant,Calculable standards,resistor
更新于2025-09-10 09:29:36
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Optical Characterization of the SPT-3G Camera
摘要： The third-generation South Pole Telescope camera is designed to measure the cosmic microwave background across three frequency bands (centered at 95, 150 and 220 GHz) with ～ 16,000 transition-edge sensor (TES) bolometers. Each multi-chroic array element on a detector wafer has a broadband sinuous antenna that couples power to six TESs, one for each of the three observing bands and both polarizations, via lumped element ?lters. Ten detector wafers populate the detector array, which is coupled to the sky via a large-aperture optical system. Here we present the frequency band characterization with Fourier transform spectroscopy, measurements of optical time constants, beam properties, and optical and polarization ef?ciencies of the detec- tor array. The detectors have frequency bands consistent with our simulations and have high average optical ef?ciency which is 86, 77 and 66% for the 95, 150 and 220 GHz detectors. The time constants of the detectors are mostly between 0.5 and 5 ms. The beam is round with the correct size, and the polarization ef?ciency is more than 90% for most of the bolometers.
关键词： Frequency bands,Beam,Fourier transform spectrometer,Cosmic microwave background,Transition-edge sensor,Polarization,Optical ef?ciency,Time constant
更新于2025-09-09 09:28:46
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A New Dynamic Model to Predict Transient and Steady State PV Temperatures Taking into Account the Environmental Conditions
摘要： Photovoltaic (PV) cell and module temperature pro?les, Tc and Tpv, respectively, developed under solar irradiance were predicted and measured both at transient and steady state conditions. The predicted and measured Tc or Tpv covered both a bare c-Si PV cell, by SOLARTEC, at laboratory conditions using a solar light simulator, as well as various c-Si and pc-Si modules (SM55, Bioenergy 195W, Energy Solutions 125W) operating in ?eld conditions. The time constants, τ, of the Tc and Tpv pro?les were determined by the proposed model and calculated using the experimentally obtained pro?les for both the bare PV cell and PV modules. For model validation, the predicted steady state and transient temperature pro?les were compared with experimental ones and also with those generated from other models. The effect of the ambient temperature, Ta, wind speed, vw, and the solar irradiance, IT, on the model performance, as well as of the mounting geometries, was investigated and incorporated in the prediction model. The predicted temperatures had the best matching to the measured ones in comparison to those from six other models. The model developed is applicable to any geographical site and environmental conditions.
关键词： environmental effects,transient pro?les,steady state,time constant,PV cell temperature,wind velocity
更新于2025-09-04 15:30:14