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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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Enhanced deep-red emission from Mn <sup>4+</sup> /Mg <sup>2+</sup> co-doped CaGdAlO4 phosphors for plant cultivation
摘要： Mn4+ doped oxide phosphors are under intensive investigation owing to their low manufacture cost and attractive luminescent features for indoor plant cultivation applications. However, it is still a challenge to develop Mn4+ doped oxides with high luminescence efficiency and thermal stability. Herein, Mn4+-Mg2+ pairs are incorporated into a CaGdAlO4 host to reduce non-radiative channels formed by Mn4+-Mn4+-O2- clusters. The photoluminescence and quantum efficiency are significantly enhanced after the introduction of Mg2+ ions to the host. A prolonged Mn4+ decay time is also obtained from the Mn4+/Mg2+ co-doped samples. Intense red emission with a narrow peak at 712 nm due to the 2Eg → 4A2g transition of Mn4+ ions is observed under 335 nm excitation. The LED fabricated by coating the synthesized phosphor on a 365 nm near-UV chip exhibit intense deep red emission with CIE chromaticity coordinates of (0.712, 0.285). The results indicate the Mn4+/Mg2+ co-doped CaGdAlO4 phosphors may be applied to the plant cultivation fields.
关键词： red phosphors,plant cultivation,LEDs,photoluminescence,Mn4+
更新于2025-09-19 17:15:36
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Impact of DNI forecasting on CSP tower plant power production
摘要： In the context of energy policies focusing on minimizing power plant emissions, concentrating solar power (CSP) technology plays an important role in the energy mix. These plants require a high level of direct normal irradiance to work properly and profitably. Over-sizing of plant capacity is frequently employed in order to store part of the energy produced, to extend the operating time throughout the day, and also to manage cloud transients. Forecasting the energy delivered by the plant is very important in plant operational strategies to ensure dispatchability as much as possible. This work presents an analysis of energy forecasting in solar tower plants by combining a short-term solar irradiation forecasting scheme with a solar tower plant model using the System Advisor Model (SAM), as the modelling tool for computing plant production throughout the year. Satellite images were used to predict Direct Normal Irradiance (DNI) on an intra-hour time-scale (up to three hours). The predictions were introduced into SAM to simulate the behaviour of the Gemasolar and Crescent Dunes plants, placed on Spain and Nevada, respectively). The results show that the best outcomes appear for the 90-mins horizon, where the Mean Bias was about -10% and the RMSE near to 23%.
关键词： Crescent Dunes (Nevada),CSP tower plant,DNI Forecasting,System Advisor Model,Gemasolar (Spain),Power Output prediction
更新于2025-09-19 17:15:36
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Can UAV-Based Infrared Thermography Be Used to Study Plant-Parasite Interactions between Mistletoe and Eucalypt Trees?
摘要： Some of the remnants of the Cumberland Plain woodland, an endangered dry sclerophyllous forest type of New South Wales, Australia, host large populations of mistletoe. In this study, the extent of mistletoe infection was investigated based on a forest inventory. We found that the mistletoe infection rate was relatively high, with 69% of the Eucalyptus fibrosa and 75% of the E. moluccana trees being infected. Next, to study the potential consequences of the infection for the trees, canopy temperatures of mistletoe plants and of infected and uninfected trees were analyzed using thermal imagery acquired during 10 flights with an unmanned aerial vehicle (UAV) in two consecutive summer seasons. Throughout all flight campaigns, mistletoe canopy temperature was 0.3–2 K lower than the temperature of the eucalypt canopy it was growing in, suggesting higher transpiration rates. Differences in canopy temperature between infected eucalypt foliage and mistletoe were particularly large when incoming radiation peaked. In these conditions, eucalypt foliage from infected trees also had significantly higher canopy temperatures (and likely lower transpiration rates) compared to that of uninfected trees of the same species. The study demonstrates the potential of using UAV-based infrared thermography for studying plant-water relations of mistletoe and its hosts.
关键词： plant hemiparasite,transpiration,infrared thermography,UAV
更新于2025-09-19 17:15:36
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uality Evaluation of “Tardivo di Ciaculli” Mandarins in Post-Harvest Processing on an Industrial Scale Using a Portable Vis/NIR Device
摘要： Vis/NIR technology is widely used today to quickly and non-destructively evaluate fruit and vegetable qualities, and many applications have been found since the 1990s. However, no industrial-scale applications can further consolidate the use of non-destructive techniques in post-harvest processing. This study aims to test the possibility of applying vis/NIR technology in a modern citrus-processing plant to assess the damage that the fruits eventually suffer when they are processed on an industrial scale and the evolution of their key quality parameters in a period of 10 days after harvest. The spectral acquisitions were performed using a portable vis/NIR device, which operated in the wavelength range of 600 to 1000 nm. The firmness, pH, and soluble solids content (SSC) were studied for “Tardivo di Ciaculli” mandarin on a total of 1800 fruits. The results show that the vis/NIR device can predict 96% of the total variability of the observed values for fruit firmness; however, the insignificance of the coefficients corresponding to the different sampling points of the processing plant, in the early stages of time, denotes the poor ability of the device to properly detect firmness in the time points closer to the fruit processing. The vis/NIR device explains 93% of the variability of the observed pH and SSC values.
关键词： Mandarin,Processing plant,Post-harvest,Vis/NIR
更新于2025-09-19 17:15:36
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Comparative assessments of the performances of PV/T and conventional solar plants
摘要： The building’s energy demand consists of both thermal energy and electricity that may be provided through solar energy sources. Typically, the electrical energy needs are satisfied by photovoltaic plants (PV)s, while the thermal energy needs are satisfied by solar thermal plants (ST)s. However, there is the possibility to produce simultaneously electrical and thermal energy by hybrid photovoltaic/thermal (PV/T) plants. This study presents the comparison of the performances of a hybrid photovoltaic/thermal (PV/T) plant with those of a systems made by a PV plant plus a ST plant (PV+ST). Such comparisons are interesting in those buildings where there is not enough available surface for installing both PV and ST plants as much as necessary for satisfying the energy needs of such buildings ( e.g. in residential tower buildings). This research is carried out having as target a residential unit situated in different geographic areas: Catania (IT) , Split (HR) and Freiburg (D). The outcomes of the energy analysis, calculated following the first and the second thermodynamic law approach, highlight that a PV/T plant produces more energy than a conventional solar system (PV-ST) in the three cities. Otherwise, the results of the economic analysis show that the PV plants allow to achieve the most economic benefits due to the cheaper cost of this technology.
关键词： Solar energy,economic analysis,hybrid PV/T plant,TRNSYS simulation,quality of energy,renewable energy
更新于2025-09-19 17:15:36
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P-Q capability chart analysis of multi-inverter photovoltaic power plant connected to medium voltage grid
摘要： This paper presents the proposal of the methodology for the development of realistic P-Q capability chart at point of common coupling of photovoltaic power plant, comprised of multiple inverter units and connected to medium voltage grid. Theoretical equations for the contribution to the total active and reactive power of the plant are derived for all plant components: inverters, low voltage cables, transformers, medium voltage cables and auxiliary consumption. It is concluded that equations for total active and reactive power are dependable on only two changing variables: voltage and momentary generation power of inverters. Equations for maximum and minimum values for total active and reactive power are further derived when known maximum and minimum values of changing variables are entered to equations, and these are presented on graph diagram as curves. Area in P-Q diagram within such calculated border curves is area of possible power plant operation points at the point of common coupling. Such representation model of this type of plant has not been proposed before. The proposed methodology has been applied to the case study plant and its operation P-Q diagram is constructed Measurements conducted on this case study plant are compared with calculated values for necessary corrections to the model.
关键词： Multi-inverter,Medium voltage grid,P-Q capability chart,Photovoltaic power plant,Reactive power
更新于2025-09-19 17:13:59
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Exergy and economic analyses of a novel hybrid structure for simultaneous production of liquid hydrogen and carbon dioxide using photovoltaic and electrolyzer systems
摘要： Power-to-X technology that converts renewable electricity to chemicals and liquid fuels will be a key component of the energy turnaround. However, for a successful transition toward fossil-free energy alternatives, serious issues associated with renewable energy storage have to be addressed. Here, we report an innovative power-to-liquid hydrogen and carbon dioxide plant. The proposed integrated plant is composed of five subsystems: power generation using grid-connected solar photovoltaic (PV) subsystem, hydrogen and oxygen gas production using an electrolyzer, oxyfuel power plant for power and heat generation, carbon dioxide liquefaction using an absorption–compression refrigeration subsystem, and a hydrogen liquefaction subsystem. This hybrid structure produces 3.359 (cid:1)(cid:2)/(cid:4) (~300 ton/day) liquid hydrogen and 10.04 (cid:1)(cid:2)/(cid:4) liquid carbon dioxide. The total exergy efficiency and specific energy consumption of the hydrogen liquefaction system are 94.87% and 3.368 (cid:1)(cid:6)?/(cid:1)(cid:2)(cid:8)(cid:9)(cid:10), respectively. Exergy analysis of this integrated structure shows that the largest contribution of exergy destruction (30.58%) is associated with the photovoltaic system and the lowest exergy efficiency (25.28%) belongs to the Turbine in an oxy-fuel subsystem where it, interestingly produces over 70% of the total energy consumption of the plant. Furthermore, the economic analysis of the plant indicates that the time required for the return of capital is 4.794 years, where the prime price of the product and the value added are 0.1921 (cid:11)(cid:12)$/(cid:1)(cid:2)(cid:8)(cid:9)(cid:10) and 0.5433 (cid:11)(cid:12)$/(cid:1)(cid:2)(cid:8)(cid:9)(cid:10), respectively. This work can certainly provide a new approach to producing liquid hydrogen and carbon dioxide for long-distance transportation and CO2 reduction using solar as the renewable energy source.
关键词： Oxyfuel power plant,Renewable energy,Photovoltaic,Electrolyzer,Thermo-Economic,Liquid hydrogen,Absorption–compression refrigeration
更新于2025-09-19 17:13:59
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Reliable energy prediction method for grid connected photovoltaic power plants situated in hot and dry climatic condition
摘要： This paper presents a mathematical model to predict the energy generation of photovoltaic power plant in hot and humid climatic condition. This model is based on meteorological data and laboratory tested solar module parameters with twenty-four inputs and one output. In addition the twenty-four inputs drive an equation to calculate final energy generation from photovoltaic power plant. Validation of the proposed model was done by comparing the results of predicted energy generation using proposed model and PVWATT software model for two existing PV power plants of India. Monthly and annual energy production and errors will be the main criteria for the selection of batter model. The result shows that in comparison with PVWATT software proposed model was found to be more efficient and accurate to predict energy generation and proposed model also reduces mean absolute percentage error and root mean square error significantly compared to PVWATT software for hot and humid climatic condition.
关键词： PV power plant,Climatic condition,India,Mathematical method,Prediction model,Energy generation
更新于2025-09-19 17:13:59
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Potential of floating photovoltaic plant in a tropical reservoir in Brazil
摘要： The increasing global demand for electricity has led to a significant increase in the search for low-impact alternative sources, with solar photovoltaic being identified as one of the most feasible options. However, photovoltaic power plants require large ground areas, which represent a major constraint. If the panels are installed on water bodies, this restriction may be avoided. In this work, a simulation was performed to assess the potential of floating photovoltaic power generation in the tropical Gavi~ao reservoir, located in the Northeast of Brazil. A payback analysis indicated that the investment in construction of the system is fully recovered in eight years, and that water losses due to evaporation can be reduced by approximately 2.6 (cid:3) 106 m3/year, sufficient to supply roughly 50,000 people.
关键词： surface reservoir,floating photovoltaic plant,renewable energy
更新于2025-09-19 17:13:59
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Quantum dots are conventionally applicable for wide-profiling of wall polymer distribution and destruction in diverse cells of rice
摘要： Plant cell walls represent enormous biomass resources for biofuels, and it thus becomes important to establish a sensitive and wide-applicable approach to visualize wall polymer distribution and destruction during plant growth and biomass process. Despite quantum dots (QDs) have been applied to label biological specimens, little is reported about its application in plant cell walls. Here, semiconductor QDs (CdSe/ZnS) were employed to label the secondary antibody directed to the epitopes of pectin or xylan, and sorted out the optimal conditions for visualizing two polysaccharides distribution in cell walls of rice stem. Meanwhile, the established QDs approach could simultaneously highlight wall polysaccharides and lignin co-localization in different cell types. Notably, this work demonstrated that the QDs labeling was sensitive to profile distinctive wall polymer destruction between alkali and acid pretreatments with stem tissues of rice. Hence, this study has provided a powerful tool to characterize wall polymer functions in plant growth and development in vivo, as well as their distinct roles during biomass process in vitro.
关键词： Glycan immunolabeling,Plant cell wall,Biomass,Rice,Quantum dots,Chemical pretreatment
更新于2025-09-19 17:13:59