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Modernization of the Thl-100 Laser System to Produce Powerful Terahertz Radiation
摘要： This paper presents the results of research on parameters of the THL-100 hybrid laser system of the visible spectrum with a view to modernizing it, in order to achieve the boundary parameters required for the pumping of non-linear crystals and production of the unprecedented THz radiation powers. The laser system consists of the Start-480M Ti:Sa starting complex and photodissociation XeF(C-A) amplifier with a 24 cm aperture. After modernization, the starting complex provides the spectrally limited radiation pulse of 60 fs at the first harmonic (950 nm) at energy of 25 mJ and 50 fs at the second harmonic (475 nm) at energy of 10 mJ. In the case of the positively chirped pulse with duration of 50 ps, the energy at the second harmonic is 3 mJ. When amplifying the negatively chirped radiation pulse in the XeF(C-A) amplifier at the wavelength of 475 nm with duration of 1.8 ps, the power of 40 TW is reached, and the maximum energy is 2 J. When amplifying the positively chirped pulse with duration of 50 ps, the highest energy of 3 J is achieved.
关键词： femtosecond complex,second harmonic,laser beam,hybrid laser system,gas amplifier,radiation energy
更新于2025-09-23 15:21:01
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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) - Quantifying the Relationship Between Higher Photovoltaic Module Efficiency and the Adoption of Distributed Solar
摘要： Some applications of data from the Clouds and the Earth’s Radiant Energy System (CERES) scanning radiometer require the use of the point response function (PRF), which describes the influence of radiance from each point on the measurement. A radiance source for the measurement of the PRF of the CERES instruments was built and installed into the Radiometric Calibration Facility, in which the CERES instruments have been calibrated. The design and application of the PRF source and the computation of the PRF from these measurements are described. In order to compare the PRF based on measurements with the theoretical PRF, it is necessary to account for the finite size of the beam from the source. The use of the PRF source and the analysis of the data are demonstrated by application to the FM-5 instrument. The measured results compare well with theory for the CERES instruments and are presented for FM-5.
关键词： Aqua,Terra,point spread function,radiometry,National Polar-orbiting Partnership (NPP),Earth radiation budget,point response function (PRF),calibration,Clouds and the Earth’s Radiation Energy System (CERES)
更新于2025-09-23 15:19:57
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[IEEE 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS) - Cranfield, United Kingdom (2019.11.25-2019.11.27)] 2019 Workshop on Research, Education and Development of Unmanned Aerial Systems (RED UAS) - A multi-UAS system for the inspection of photovoltaic plants based on the ROS-MAGNA framework
摘要： Some applications of data from the Clouds and the Earth’s Radiant Energy System (CERES) scanning radiometer require the use of the point response function (PRF), which describes the in?uence of radiance from each point on the measurement. A radiance source for the measurement of the PRF of the CERES instruments was built and installed into the Radiometric Calibration Facility, in which the CERES instruments have been calibrated. The design and application of the PRF source and the computation of the PRF from these measurements are described. In order to compare the PRF based on measurements with the theoretical PRF, it is necessary to account for the ?nite size of the beam from the source. The use of the PRF source and the analysis of the data are demonstrated by application to the FM-5 instrument. The measured results compare well with theory for the CERES instruments and are presented for FM-5.
关键词： Aqua,Terra,point spread function,radiometry,Earth radiation budget,point response function (PRF),calibration,Clouds and the Earth’s Radiation Energy System (CERES),National Polar-orbiting Partnersship (NPP)
更新于2025-09-16 10:30:52
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Energy and Exergy Analysis of Photovoltaic Thermal Air Collector Under Climatic Condition of North Eastern India
摘要： The performance of photovoltaic thermal (PVT) air collector has been studied in the climatic condition of North East, India theoretically and as the climatic condition of north east is different from the other zones of India. For this study, one of the city located in north eastern India named Silchar is chosen. Firstly, the validation of the theoretical model has been done with the experimental model of Agarwal and Tiwari (2012) which shows that theoretical model is in fair agreement with the experimental model as the correlation coefficient and root mean square percent deviation has been found as 0.94 and 9.1 %. The study is performed with three different values of mass flow rate (0.007 kg/s, 0.0097 kg/s and 0.0128 kg/s) for a typical day of December and March. It has been found that the maximum solar radiation has been achieved at 12.00 hr of the day for both the month under consideration. The nature of variation of solar cell temperature, back surface temperature, outlet air temperature, thermal and exergy gain throughout the day has been observed for different mass flow rates. It was reported from the study that the PVT air collector has better thermal performance for the mass flow rate of 0.0128 kg/s. For a mass flow rate of 0.0128 kg/s, it has been observed that for a typical day of December, the thermal energy gain and exergy gain has been achieved as152 Wh, and 7.88Wh, respectively, whereas for the month of March it has been observed as 185.15 Wh, and 17.82 Wh, respectively at 12.00 hr. Maximum outlet temperature has been obtained as 45°C, and 53°C, during winter (December) and summer (March), respectively. The exergy gain is found to enhance by almost 100% during summer than that of winter.
关键词： exergy,mass flow rate,solar radiation,energy,PVT air coolector
更新于2025-09-12 10:27:22
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Solar light distribution inside a greenhouse with the roof area entirely covered with photovoltaic panels
摘要： Most photovoltaic (PV) greenhouses in Europe have maximised the energy production without considering the requirements of the crops, by applying PV panels on most part of the roof area. The aim of this work is to calculate the solar light distribution in a photovoltaic (PV) greenhouse where the entire roof area is covered with PV panels (100% cover ratio). The calculation of the incident global was estimated with clear sky conditions on several observation points located inside the greenhouse at 1.5 m from the ground level. The validation of the simulated data was conducted through measurements inside a PV greenhouse complex located in Florinas, Italy (40°38’38”N; 8°39’31”E), composed by 24 single-span greenhouse modules of 837 m2 each and total area of 2.2 ha. The roof area of each module was completely covered with a monocrystalline PV array with slope of 20° and a rated power of 22 kWp. The results were shown through a map of light distribution on the greenhouse area, which highlighted the most penalised zones and the percentage of available global radiation, compared to the same greenhouse without PV array. Good agreement was shown by the simulated data, compared to measurements (mean R2=0.78). The global radiation on the greenhouse area was 33% on yearly basis, compared to the potential value with no PV panels on the roof. The zones close to the gable walls and the south side wall suffered less shading compared to the central portion of the greenhouse area. The map of cumulated light distribution can support the growers to increase the agronomic sustainability of the PV greenhouse, since it will allow in perspective the identification of species and crop management practices for a profitable cultivation.
关键词： agricultural sustainability,PV greenhouse,crop,model,solar radiation,energy
更新于2025-09-11 14:15:04