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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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Novel efficient deep-red-emitting Ca2LuTaO6:Mn4+ double-perovskite phosphors for plant growth LEDs
摘要： Deep-red-emitting phosphors are important for fabricating light-emitting diodes (LEDs) toward applications in plant growth lighting. Herein, we reported on novel efficient deep-red-emitting Mn4+-activated Ca2LuTaO6 (CLT) double-perovskite phosphors. A series of CLT:xMn4+ (x = 0.1, 0.2, 0.4, 0.6, 0.8, and 1.0 mol%) samples were prepared by the conventional high-temperature solid-state reaction technique, and they were characterized by using X-ray diffraction (XRD), field-emission scanning electron microscope (FE-SEM), elemental mapping, photoluminescence excitation and emission, decay curves, CIE chromaticity coordinates, internal quantum efficiency (IQE), and temperature-dependent emission spectra. The CLT host crystallized in a monoclinic structure with space group of P21/n, and it contained an octahedral site of TaO6 for Mn4+ doping. Impressively, under 351 ultraviolet light excitation these CLT:xMn4+ phosphors exhibited bright deep-red emissions around 682 nm with CIE chromaticity coordinates of (0.7272, 0.2728) and full width at half maximum (FWHM) of 25 nm. Notably, the optimal CLT:0.2%Mn4+ sample possessed an IQE of 37% and good resistance to thermal quenching (I423 K/I303K = 47%). Considering the emission spectrum of CLT:0.2%Mn4+ deep-red-emitting phosphors matched well with the absorption spectrum of phytochrome PFR, the as-prepared CLT:0.2%Mn4+ phosphors showed great potential in plant growth LEDs.
关键词： Deep-red emissions,Phosphors,Luminescence,Double-perovskite,Mn4+,Plant growth lighting
更新于2025-09-19 17:13:59
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Cold plasma treatment and laser irradiation of <i>Triticum</i> spp. seeds for sterilization and germination
摘要： In this research work, plasma and laser-based treatments have been applied on wheat seeds to improve their growth and development. Plasma treatment modi?ed the surface morphology of seed which enhanced the germination rate and also exhibited great immunity against fungus; only 20% seeds are a?ected by fungus as compared to the untreated sample. In addition, an increase in protein concentration in plasma treated seeds has also been observed. In the laser treatment, laser pulses have been exercised on wheat seeds, while seeds were also exposed in argon plasma generated at di?erent applied voltages and exposure times. This laser treatment lessens germination time, increases water absorption, and abolishes disease development from seed borne fungi that are present on or within seeds. Thus, it is observed that the use of plasma and laser radiation on the seeds made productive e?ects on the growth parameters and may be the alternative source for the presowing seed treatment.
关键词： microbial inactivation,food chemistry,wheat seeds,plasma chemistry,plant biotechnology,cold plasma,germination
更新于2025-09-19 17:13:59
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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) - Comparison of AC and DC Bus Interconnections of Energy Storage Systems in PV Power Plants with Oversized PV Generator
摘要： Oversizing the photovoltaic (PV) generator improves the profitability of PV power plants, but a downside is energy losses due to power clipping. If an energy storage system (ESS) is needed, connecting it to the DC side enables the utilization of the clipped energy. We compared the AC and DC bus interconnections of ESS in a typical building block of megawatt-scale PV power plants. The DC bus interconnection increases the energy yield, but also the utilization of the ESS. The operation of the ESS is affected by the production profile of the PV generator, ESS energy capacity and DC-to-AC power ratio.
关键词： optimal design,power plant design,energy storage systems,PV generator
更新于2025-09-19 17:13:59
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A Cost-Effective and Portable Optical Sensor System to Estimate Leaf Nitrogen and Water Contents in Crops
摘要： Non‐invasive determination of leaf nitrogen (N) and water contents is essential for ensuring the healthy growth of the plants. However, most of the existing methods to measure them are expensive. In this paper, a low‐cost, portable multispectral sensor system is proposed to determine N and water contents in the leaves, non‐invasively. Four different species of plants—canola, corn, soybean, and wheat—are used as test plants to investigate the utility of the proposed device. The sensor system comprises two multispectral sensors, visible (VIS) and near‐infrared (NIR), detecting reflectance at 12 wavelengths (six from each sensor). Two separate experiments were performed in a controlled greenhouse environment, including N and water experiments. Spectral data were collected from 307 leaves (121 for N and 186 for water experiment), and the rational quadratic Gaussian process regression (GPR) algorithm was applied to correlate the reflectance data with actual N and water content. By performing five‐fold cross‐validation, the N estimation showed a coefficient of determination (??2) of 63.91% for canola, 80.05% for corn, 82.29% for soybean, and 63.21% for wheat. For water content estimation, canola showed an ??2 of 18.02%, corn showed an ??2 of 68.41%, soybean showed an ??2 of 46.38%, and wheat showed an ??2 of 64.58%. The result reveals that the proposed low‐cost sensor with an appropriate regression model can be used to determine N content. However, further investigation is needed to improve the water estimation results using the proposed device.
关键词： plant phenotyping,non‐invasive,machine learning,reflectance,leaf nitrogen
更新于2025-09-19 17:13:59
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The Analysis of Lead Phytotoxicity in Seeds Using CO2 Laser Photoacoustic Spectroscopy
摘要： Lead (Pb) is the most prevalent heavy metal pollutant in the natural environment. Pb is not a fundamental element for plants, but they absorb it when it is present in their environment, having no known physiological activity. The aim of our research was to evaluate the efficacy of laser photoacoustic spectroscopy as a tool to monitor changes induced by Pb in plant respiration by highlighting two molecular markers (C2H4 and CO2). To better understand Pb phytotoxicity, we monitored the plantlets evolution as well as the morphology of the root cells. Firstly, we showed that the treatment hinders the plantlet’s development. Furthermore, using laser photoacoustic spectroscopy, we found a decrease in the concentration of C2H4 and CO2 vapors measured in the respiration of treated plants. Finally, fluorescence microscopy results showed that in Pb treated plantlets, the cell roots morphology is clearly altered as compared with the untreated ones. All the results are well correlated and can help further in understanding Pb phytotoxicity.
关键词： fluorescence microscopy,gas molecules,plant respiration measurement,IR spectroscopy,analysis of gases
更新于2025-09-19 17:13:59
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Dye-sensitized solar cells based on graphene oxide and natural plant dye extract
摘要： The world is advancing quickly in terms of population and technology and this has placed a high demand on energy. The exploitation of conventional sources of energy such as fossil fuel, has proven to be harmful to the environment and its biota. Consequently, there is a need to exploit clean, renewable and sustainable sources of energy like the sun. Dye-sensitized solar cells (DSSCs) have been of particular interest owing to their low price-to-performance ratio, relatively low cost of fabrication, availability of raw materials and eco-friendliness. The performance of the cell is highly dependent on the materials used for each of its components: the sensitizer, photoanode, counter electrode and the electrolyte. This work was carried out to study the photovoltaic properties of DSSCs based on TiO2-GO photoanodes sensitized with natural dye pigments. Graphene oxide (GO), synthesized from graphite by Hummer’s method, was incorporated into the photoanodes to study the effects of its varying composition on the photovoltaic performance of the cells. GO was incorporated into the photoanodes by forming a nanocomposite layer (GO-TiO2) onto a pristine TiO2 nanoparticle layer to form double-layer sensitized photoanodes. The synthesized GO was characterized by UV–vis spectroscopy showing an absorbance peak at 221 nm wavelength, characteristic of GO. Mimosa pudica dye, a chlorophyll dye, was extracted from the leaves of the photosensitive green plant to sensitize the photoanodes. The photovoltaic properties of the cells were evaluated by current density–voltage (JV) curves. Promising results were observed. Generally, the incorporation of GO in the double layer photoanodes enhanced the photovoltaic properties of the cells. This led to a 41% improvement in ef?ciency for 0.71 wt% GO double layer based DSSC compared to the single layer nanoparticle based DSSC. The highest ef?ciency was recorded for the double layer (DL) photoanode with 0.71 wt% GO composition (Voc = 0.284, Jsc = 16.085, FF = 0.00035, g = 0.1%). Furthermore, single-layer chlorophyll-sensitized photoanodes were compared with single-layer anthocyanin-sensitized photoanodes using Rhoeo spathacea and Hibiscus rosa-sinensis dye extracts. The highest ef?ciency was recorded for the TiO2/ Hibiscus rosa-sinensis (Voc = 0.468, Jsc = 0.039, FF = 0.485, g = 0.55%).
关键词： Dye-sensitized solar cells,Plant dye,Photovoltaic properties,Graphene oxide
更新于2025-09-19 17:13:59
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[IEEE 2019 3rd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT) - Ankara, Turkey (2019.10.11-2019.10.13)] 2019 3rd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT) - Virtual Power Plant Application for Rooftop Photovoltaic Systems
摘要： Virtual Power Plant (VPP) systems are highly advanced and innovative systems that take complex infrastructure to work in synergy, compared to the traditional transmission energy system. The ICT component of a VPP is highly developed with vigorous algorithms that help to achieve specific functions. Identification and control either by reception of status and signaling the Distributed Energy Resource (DER) is what makes VPP a more advanced energy sharing platform. Above all, it has a business model and this makes it exceptional over traditional transmission system. VPPs with different scales and different energy system coverages have recently been applied in countries such as USA, Belgium, Germany and Sweden. Many companies are nowadays venturing into these systems as they proof to be the future of distributed energy systems that aim to integrate renewable energy with traditional energy resources, with the objective of generating energy at low cost and ensuring consumers participate in its production as proconsumers. In this paper, recent VPP applications along with renewable energy resources used have been discussed and the main components that make up a VPP system efficient have been clearly outlined. As a result of this preliminary research, potential road map of local/regional utility companies in Turkey for applicable VPP management structure and software architecture is suggested.
关键词： Virtual Power Plant,Rooftop photovoltaic,Renewable Energy Sources,Distributed Energy Sources
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Chengdu, China (2019.5.21-2019.5.24)] 2019 IEEE Innovative Smart Grid Technologies - Asia (ISGT Asia) - Review on modeling of photovoltaic power generation systems
摘要： In recent years, photovoltaic (PV) power generation has developed rapidly at China and abroad. PV power generation is on the trend from auxiliary power supply to main power supply even leading power supply. Due to the fluctuation and intermittent characteristics of PV power generation, and zero inertia, the integration of large-scale grid-connected PV power generation may have a negative impact on the stability of the power system. Modeling grid-connected PV power generation systems is the key factor to investigate the influence between it and other parts of power system. Modeling of PV is also a hot issue that has been studied continuously for many years around the world. GE, WECC, CIGRE, CEPRI and so on have attached great importance to this issue and have published many research results. The existing research at China and abroad is reviewed in this paper, the existing problems are analyzed, and suggestions for future research are given.
关键词： power plant,model validation,photovoltaic (PV) power generation,power unit,modeling
更新于2025-09-16 10:30:52
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Land Use Assessment of Economic Crops for Photovoltaic Power Plant in Phetchabun Province
摘要： This research focuses at the change of land use from agriculture to photovoltaic power plant. Geographic information system (GIS) technology was used to indicate the unsuitable areas for five economic crops namely paddy, sugar cane, maize, cassava and para rubber. The assess cost, income, and CO2 emission of the economic crops and photovoltaic power plant are the major factors for deciding the suitability of the land use. The results were found that the unsuitable areas of the five economic crops are 241,142 rai and there is 17.6 MJ/m2.day of average solar radiation, which is suitable to build the photovoltaic power plant. The profit/loss of paddy, sugar cane, maize, cassava and para rubber in the suitable areas are -1,193 baht/ton, 33 baht/ton, 85 baht/ton, 259 baht/ton and -9,150 baht/ton, respectively while photovoltaic power plant cost and income are 4.12 baht/kWh and 5.65 baht/kWh respectively. CO2 emission of paddy, sugar cane, maize, cassava, para rubber and photovoltaic power plant are 2,315 kgCO2eq/ton, 37.15 kgCO2eq/ton, 256.12 kgCO2eq/ton, 29.07 kgCO2eq/ton, 153 kgCO2eq/ton and -0.5743 kgCO2eq/kWh, respectively. Results revealed that land use change from economic crops planting to photovoltaic power plant construction, in unsuitable areas is appropriate and worthy from the environmental and the economic aspect.
关键词： Photovoltaic power plant,Geographic information system,Land use
更新于2025-09-16 10:30:52
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Active Hyperspectral Mid-Infrared Imaging Based on Widely Tunable QCL Laser
摘要： Thermal imaging and the recent availability of widely tunable infrared QCL lasers (Quantum Cascade Laser) allow us to propose an active hyperspectral imaging system operating in mid-infrared (MIR) band to obtain simultaneously large amounts of spatial and spectral information on the samples. In order to evaluate more precisely the capacities of the active hyperspectral imaging, we propose a system composed of four powerful QCL tunable lasers (in order to cover 3 – 5 μm and 7 – 11 μm wavelengths) and three cameras: a visible and near-infrared (NIR) range, a bolometer for 7 – 13 μm range and an InSb cooled camera for 3 – 5 μm range. We present the algorithm for image acquisition, image and data processing. Finally, we present and discuss some preliminary results using this system to characterize plant leaves under controlled growing conditions.
关键词： plant monitoring,tunable QCL laser,mid-infrared,hyperspectral imaging,image processing
更新于2025-09-16 10:30:52