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- 2015
- Xanthomonas oryzae
- multispectral and multimodal microscopy
- spectroscopic imaging
- plant cell diseases
- classification
- rice
- Applied Physics
- University of Sciences, Technique and Technology Bamako
- Institut National Polytechnique Felix Houphou?t-Boigny Yamoussoukro
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Performance assessment of domestic photovoltaic power plant with a storage system
摘要： Grid-connected low voltage photovoltaic power plants cover the majority of the power capacity installed in Italy. They offer an important contribution to the power demand of the utilities connected but, due to the nature of the solar resource, the night time consumption can be satisfied only withdrawing the energy by the national grid, at the price of the energy distributor. Thanks to the improvement of storage technologies and the decreasing of costs, the installation of a system of battery looks a promising solution. In this paper, a model-based approach to analyze and discuss the performance of a domestic photovoltaic power plant with a storage system is presented.
关键词： Service Availability,Dynamic Reliability,Retrofit Photovoltaic Power Plant,Monte Carlo Simulation
更新于2025-09-16 10:30:52
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Study to improve the efficiency of c-Si material in photovoltaic power plant
摘要： In the present communication, comparison between performance of photovoltaic module with and without duct has been carried out. Different input parameters (namely, ambient air temperature, solar radiation wind speed etc.) have been considered for IIT, Delhi campus. Further, thermal modelling has been derived for the c-Si photovoltaic (PV) module alone and PV module with duct. Different parameters like outlet air temperature from duct and cell temperature have been calculated through MATLAB coding. Due to integration of duct, 3.89% and 125.74% increase in electrical output and equivalent thermal energy have been found in comparison to stand-alone PV module.
关键词： Power plant,Thermal modelling,Photovoltaic module,Equivalent thermal efficiency,Equivalent thermal energy
更新于2025-09-16 10:30:52
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Effect of Irradiance Measurement Sensors on the Performance Ratio of Photovoltaic Power Plant Under Real Operating Conditions: An Experimental Assessment in Turkey
摘要： The performance analysis of photovoltaic (PV) plants plays an important role in making investment decisions, creating more efficient designs, and in the operation and maintenance decisions in new plants. In addition, performance analysis provides a way to identify real-time operational problems and allows comparisons among different PV plants. Performance of PV plants can be indexed with many parameters, but service providers are giving energy guarantees according to their performance ratio (PR). There are many factors that affect PR, such as irradiation, temperature, wind speed, humidity and soiling. But, the most important factors affecting PR are irradiation and temperature. Hence, both the irradiation and the temperature must be measured correctly. Solar irradiation is usually measured with a pyranometer or reference cell. However, there are differences between the obtained data from these two sensors, which affects the PR significantly. In this study, the PR of an MW PV plant installed in Turkey was investigated. Two types of irradiation sensors (pyranometer and reference cells) and PVGIS program were used. The data were collected every 5 min during 1 year. The data passed through quality control and filtered process and some improper values were removed from the row data set. In addition, new data were written instead of the missing data. PR was calculated by using conventional and corrected method. As a result, the average annual PR is determined to be 81.05%, 79.04% and 78.96% and the corrected PR is determined to be 83.69%, 82.48% and 80.87% using the reference cell, pyranometer and PVGIS program, respectively.
关键词： Solar energy,Uncertainty of measurement sensors,Irradiance sensor,Corrected PR,Performance ratio (PR),Photovoltaic plant
更新于2025-09-16 10:30:52
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Photomorphogenesis of wheat sprouts with LED irradiation of different intensities
摘要： Definition of the growth and development characteristics of plants in varied light conditions is a key factor for the creation of highly efficient light facilities for plant cultivation. Experimental research was conducted using an LED irradiation facility with photosynthetic photon flux densities ranging from 0 to 261 lmol m?2 s?1 and a continuous spectrum with maxima at 445 and 600 nm. Under the maximum photosynthetic photon flux density (261 lmol m?2 s?1) wheat germs demonstrated diminishing leaf surface with high values of specific leaf area, enhanced pubescence of ground tissues, increases in the number of stomata on the upper epidermis and palisade, and an increase in the thickness of the leaves as well as an increase in carotenoids but a decrease in the chlorophyll atb/carotenoids relation. It was revealed that the optimum level of photosynthetic photon flux density for the referred spectrum was in the range from 82 to 100 mmol m?2 s?1, which may enable a reduction of irradiance under specific conditions during early development with no harm to the plants while minimizing energy consumption during cultivation.
关键词： photosynthetic photon flux density,photomorphogenesis,wheat sprouts,LED irradiation,plant cultivation
更新于2025-09-16 10:30:52
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A Novel Plant Propagation-Based Cascaded Fractional Order PI Controller for Optimal Operation of Grid-Connected Single-Stage Three-Phase Solar Photovoltaic System
摘要： Grid-connected photovoltaic (PV) inverters are gaining attention all over the world. The optimal controller setting is key to the successful operation of a grid-connected PV system. In this paper, a novel plant propagation algorithm-based fractional order proportional-integrator (FOPI) controller for cascaded DC link voltage and inner current control of a grid-connected PV controller has been proposed, which outperforms particle swarm optimization-based PI and elephant herding optimization-based FOPI in terms of multicriteria-based analysis. The performance of the proposed controller also has been measured in terms of total harmonic distortion to maintain the appropriate power quality. Also, the proposed controllers were tested under various solar irradiance and voltage sag conditions to show the effectiveness and robustness of the controllers. The whole system is developed in OPAL-RT using MATLAB/Simulink and RT-LAB as a machine-in-loop (MIL) system to validate the performance in real time.
关键词： DC link voltage controller,inner current controller,elephant herding optimization,plant propagation algorithm,grid-connected PV,particle swarm optimization,fractional order PI controller
更新于2025-09-16 10:30:52
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Novel orange–red emitting phosphor Sr8ZnY(PO4)7:Sm3+ with enhanced emission based on Mg2+ and Al3+ incorporation for plant growth LED lighting
摘要： In this paper, a series of novel orange-red emission phosphors Sr8ZnY(PO4)7:Sm3+ (SZYP:Sm3+) were synthesized by high-temperature solid-state reaction. The photoluminescence and concentration-dependent properties of this phosphor were investigated carefully through diffuse reflection spectra, excitation and emission spectra, Commission Internationale de l’éclairage (CIE) chromaticity coordinate and decay times. SZYP:Sm3+ could be efficiently excited by n-UV and blue lights which center at 318, 345, 363, 376, 401, 410, 440 and 475 nm, respectively. The characteristic orange-red emission peaking at 563, 601 and 647 nm had been detected, which should be attributed to the characteristic f–f forbidden transition of Sm3+. The internal quantum efficiency (IQE) of ideal phosphor of SZYP:0.09Sm3+ reached as high as 47%. In addition, The concentration quenching mechanism and thermal stability of SZYP:Sm3+ were further investigated. It was found SZYP:Sm3+ can maintain 93% of initial emission intensity at 150 °C and the corresponding activation energy was calculated to be 0.26 eV based on Arrhenius formula. The emission intensity of 1.0Mg2+ incorporated SZYP:0.09Sm3+ and 0.02Al3+ reached up to 134% and 117% of the initial value, respectively. Moreover, (light-emitting diodes) LED devices were fabricated by employing the optimized samples as orange-red component with 365 nm n-UV chips. The desired emission in plant absorption region and extremely high thermal stability imply that SZYP:Sm3+ is suitable for the application in plant growth LED lighting.
关键词： Thermal stability,Sm3+,Plant growth lighting,Phosphors
更新于2025-09-16 10:30:52
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AIP Conference Proceedings [Author(s) SolarPACES 2017: International Conference on Concentrating Solar Power and Chemical Energy Systems - Santiago, Chile (26–29 September 2017)] - Techno-economic optimization of molten salt solar tower plants
摘要： In this paper the results of a techno-economic analysis of improved and optimized molten salt solar tower plants (MSSTP plants) are presented. The potential improvements that were analyzed include different receiver designs, different designs of the HTF-system and plant control, increased molten salt temperatures (up to 640°C) and multi-tower systems. Detailed technological and economic models of the solar field, solar receiver and high temperature fluid system (HTF-system) were developed and used to find potential improvements compared to a reference plant based on Solar Two technology and up-to-date cost estimations. The annual yield model calculates the annual outputs and the LCOE of all variants. An improved external tubular receiver and improved HTF-system achieves a significant decrease of LCOE compared to the reference. This is caused by lower receiver cost as well as improvements of the HTF-system and plant operation strategy, significantly reducing the plant own consumption. A novel star receiver shows potential for further cost decrease. The cavity receiver concepts result in higher LCOE due to their high investment cost, despite achieving higher efficiencies. Increased molten salt temperatures seem possible with an adapted, closed loop HTF-system and achieve comparable results to the original improved system (with 565°C) under the given boundary conditions. In this analysis all multi tower systems show lower economic viability compared to single tower systems, caused by high additional cost for piping connections and higher cost of the receivers.
关键词： receiver designs,HTF-system,molten salt solar tower plants,plant control,techno-economic analysis,increased molten salt temperatures,multi-tower systems
更新于2025-09-16 10:30:52
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LED applications in greenhouse and indoor production of horticultural crops
摘要： Arrays of light-emitting diodes (LEDs) are increasingly being used in controlled environments to deliver photoperiodic, supplemental, and sole-source lighting to speciality crops. Compared to conventional light fixtures such as high-pressure sodium or fluorescent, LEDs emitting different bands of radiation can be combined to create light spectra that regulate specific plant responses such as extension growth and flowering. LED applications in horticulture can be divided into three major categories: 1) low-intensity lighting to regulate photoperiodic and photomorphogenic responses; 2) supplemental (photosynthetic) lighting in greenhouses to increase growth and yields; and 3) sole-source lighting to consistently produce crops indoors, conceivably with value-added attributes. Potential advantages of LED lighting include greater efficacy at converting electricity into photosynthetic photons; selection and manipulation of the radiation spectrum to elicit specific plant responses; less emission of radiant heat; more focused lighting, resulting in less loss to non-target areas; instant on/off and dimming capabilities; and greater longevity. The primary barrier to commercial implementation of LED lighting in horticulture continues to be return on investment, which is situational. This paper presents a science-based, practical summary of LED applications in the production of horticultural crops grown in controlled environments, especially vegetable and floriculture crops.
关键词： photoperiodic lighting,sole-source lighting,plant growth,flowering,controlled environments,supplemental lighting,light-emitting diodes
更新于2025-09-12 10:27:22
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Investigations of the instantaneous performance of a solar chimney power plant installed in Aswan using IoT
摘要： Although solar chimney power plant (SCPP) has a promising potential to convert the solar energy to electric power, greater efforts are needed to ensure its successful commercialisation on a large scale. The main obstacles with regard to the large-scale applications of SCPP are its efficiency, bulk size and dependency on solar irradiation. A comprehensive study on the integration of the Internet-of-Things (IoT) as a novel technique to monitor and hence improve its performance is presented. A small-scale SCPP is designed and constructed specifically for this purpose in Aswan, Egypt. The instantaneous performance parameters (temperature, solar intensity, wind speed, open circuit voltage, power etc.) were measured and further processed using IoT. The results show that IoT has a promising potential to enhance the performance of the system by providing a complete picture of the whole measurements. This is considered as a step forward for enhancing the technologies which will ensure the success of large-scale SCPP in the real world.
关键词： solar chimney power plant,performance monitoring,renewable energy,Internet-of-Things
更新于2025-09-12 10:27:22
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Environmental evaluation of Waste to Energy plant coupled with concentrated solar energy
摘要： Life Cycle Assessment (LCA) was applied to evaluate the environmental impact of a hybrid energy system based on the integration of a Waste to Energy plant with concentrated solar energy plant. In the Waste to Energy (WtE) section only saturated steam is produced, while the superheating takes place in an external superheater fed by the concentrated solar energy or, when this is not enough, by a natural gas backup boiler. Different couples of pressure and temperature, for the superheated steam (51 bar, 440 °C; 60 bar, 480 °C; 70 bar, 520 °C), different values for the solar multiple (1.5, 2.0 and 2.5) and different values for the thermal storage capacity (6 h, 10 h and 14 h) were considered, leading to 27 possible cases. Construction, operation and end-of-life phases were included in the LCA system boundary. Calculated global warming indicator, in kg of equivalent CO2 per MJ of produced electricity, slightly decreases for increasing steam parameter cases and for increasing storage hour cases, while a more relevant reduction was observed for increasing solar multiple values. The main contribution to global warming derives from the operation phase of the WtE part (67-86% of the operation), while the remaining part (14-33%) is given by the solar section, for which, in turn, the main contribution is the impact deriving from the natural gas combustion in the backup boiler.
关键词： WtE plant,life cycle assessment,global warming,concentrated solar energy
更新于2025-09-12 10:27:22