scholarly journals 19.1: Synthesis and Spectral Quality of Flexible Display Dichroic Dye Polarizer

2021 ◽  
Vol 52 (S1) ◽  
pp. 126-126
Author(s):  
Xiaolian Li ◽  
Rouchen Pan
Keyword(s):  
Spectral Quality ◽  
Flexible Display ◽  
Dichroic Dye

scholarly journals Integration of Satellite Data with High Resolution Ratio: Improvement of Spectral Quality with Preserving Spatial Details

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4418 ◽  
Author(s):  
Aleksandra Sekrecka ◽  
Michal Kedzierski
Keyword(s):  
High Ratio ◽  
Data Sets ◽  
Spectral Quality ◽  
Local Statistics ◽  
Panchromatic Image ◽  
Urbanized Area ◽  
Fusion Methods ◽  
Spatial Quality ◽  
Different Levels

Commonly used image fusion techniques generally produce good results for images obtained from the same sensor, with a standard ratio of spatial resolution (1:4). However, an atypical high ratio of resolution reduces the effectiveness of fusion methods resulting in a decrease in the spectral or spatial quality of the sharpened image. An important issue is the development of a method that allows for maintaining simultaneous high spatial and spectral quality. The authors propose to strengthen the pan-sharpening methods through prior modification of the panchromatic image. Local statistics of the differences between the original panchromatic image and the intensity of the multispectral image are used to detect spatial details. The Euler’s number and the distance of each pixel from the nearest pixel classified as a spatial detail determine the weight of the information collected from each integrated image. The research was carried out for several pan-sharpening methods and for data sets with different levels of spectral matching. The proposed solution allows for a greater improvement in the quality of spectral fusion, while being able to identify the same spatial details for most pan-sharpening methods and is mainly dedicated to Intensity-Hue-Saturation based methods for which the following improvements in spectral quality were achieved: about 30% for the urbanized area and about 15% for the non-urbanized area.

scholarly journals On the Spectral Quality of Time-Resolved CMOS SPAD-Based Raman Spectroscopy With High Fluorescence Backgrounds

2020 ◽  
Vol 20 (9) ◽  
pp. 4635-4645
Author(s):  
Jere Kekkonen ◽  
Tuomo Talala ◽  
Jan Nissinen ◽  
Ilkka Nissinen
Keyword(s):  
Raman Spectroscopy ◽  
Spectral Quality ◽  
Time Resolved ◽  
High Fluorescence

Harmonics control of three phase voltage source inverter with random carriers and modified reference

2021 ◽  
pp. 002072092199659
Author(s):  
R Anand ◽  
L Padmasuresh ◽  
P Muthukumar ◽  
P Sreeja ◽  
V Krishnakumar ◽  
...  
Keyword(s):  
Motor Drives ◽  
Voltage Source ◽  
Spectral Quality ◽  
Phase Voltage ◽  
Voltage Source Inverter ◽  
Middle Portion ◽  
Induction Motor Drives ◽  
Three Phase ◽  
Experimental Values

The Harmonics control of any inverters can be decided by the PWM incorporated for the switches. In recent years the carrier and reference modification based research is going on the inverter field. This paper suggests that the alteration of carriers and references of the three phase voltage source inverter enhance the ability to decrease the harmonic content.This enhanced realization deals with the carrier and reference modification arrangement for three phase voltage source inverter through amalgamating the boosted reference and random triangular carrier. The boosted reference is the addition of sine reference with injection of 1/3rd of reference amplitude (3fs) in the middle portion of the reference wave. i.e., [Formula: see text] to [Formula: see text] and [Formula: see text] to [Formula: see text] . The proposed PWM scheme use two carriers, one is Triangle wave and another one is inverted Triangle wave. The process of selecting the winning carrier among the two triangle carriers is purely based on the LFSR technique. The spectral quality of the induction motor drives has improved by the random carriers. The simulation and experimental values are proving the validity of the PWM method. The PWMs are generated by using parallel processing enabled FPGA processor.

Perception of shade

1983 ◽  
Vol 303 (1116) ◽  
pp. 503-521 ◽  
Keyword(s):  
Blue Light ◽  
Physiological Responses ◽  
Specific Form ◽  
Radiation Environment ◽  
Physiological Age ◽  
Fluence Rate ◽  
Spectral Quality ◽  
Natural Radiation ◽  
Environment Changes

Plants perceive shade by responding to both the fluence rate and to the spectral quality of the natural radiation environment. Changes in fluence rate are perceived by separate photoreceptors absorbing in both the blue and the red wavebands. The identity of the photoreceptor (or photoreceptors) responding to changes in the fluence rate of blue light is unknown (see Briggs, this volume). Physiological responses to changes in the fluence rate in the red waveband appear to be mediated through phytochrome. The relative roles played by the blue-light-absorbing photoreceptor and phytochrome in determining the response to changes in fluence rate varies between species and organs and is also dependent on the physiological age of the plant. Evidence is also presented that supports the concept that phytochrome functions to perceive the specific form of shade caused by surrounding competitive vegetation.

scholarly journals Spectral pre and post processing for infrared and Raman spectroscopy of biological tissues and cells

2016 ◽  
Vol 45 (7) ◽  
pp. 1865-1878 ◽  
Author(s):  
Hugh J. Byrne ◽  
Peter Knief ◽  
Mark E. Keating ◽  
Franck Bonnier
Keyword(s):  
Raman Spectroscopy ◽  
Spectral Data ◽  
Biomedical Applications ◽  
Biological Tissues ◽  
Spectral Quality ◽  
Post Processing ◽  
Factors Influencing ◽  
Infrared And Raman Spectroscopy ◽  
Processing Steps

This review presents the current understanding of the factors influencing the quality of spectra recorded and the pre-processing steps commonly employed to improve on spectral quality, as well as some of the most common techniques for classification and analysis of the spectral data for biomedical applications.

scholarly journals Physiological characteristics of endive, lettuce and chicory seeds as a function of spectral quality

2020 ◽  
Vol 11 ◽  
pp. e3227
Author(s):  
Matheus Milani Pretto ◽  
Daniele Cristina Fontana ◽  
Jullie Dos Santos ◽  
Axel Bruno Mariotto ◽  
Braulio Otomar Caron ◽  
...  
Keyword(s):  
Dry Mass ◽  
Germination Percentage ◽  
Spectral Quality ◽  
Second Stage ◽  
Randomized Design ◽  
Seedling Length ◽  
Red Led ◽  
Third Stage ◽  
Significant Length

Seedling production is a critical step in the establishment of vegetables. This work aimed to evaluate the effect of different spectral qualities on the germination and vigor of endive, lettuce, and chicory seeds. The experiment was carried out in three stages. The first stage, two cultivars of lettuce (‘Crespa Repolhuda’ and ‘Vera’) and six spectral qualities (blue LED, red LED, blue + red LED, white LED, fluorescent and dark) were evaluated; the second stage, two cultivars of chicory (‘Lisa Escarola’ and ‘Palla Rosa’) and the same spectral qualities were evaluated. In the third stage, the spectral quality of the endive cultivar ‘Pão de Açúcar’ was evaluated. The experiments were performed in a completely randomized design, with four replications of 50 seeds each. The evaluated parameters were: germination percentage, first count, germination speed index, seedling length, and fresh and dry mass. Endive, lettuce and chicory seeds germinated both in the presence or not of light so that they can be classified as neutral photos. A spectral LED of red quality fostered the development of the most significant volume of fresh mass on the endive, lettuce, and chicory. All the spectral qualities stimulated root growth. The dark, on the other hand, promoted the most significant length of the aerial part, promoting seedlings etiolation.

scholarly journals Reducing Inflorescence Formation by Shading Individual Sultana Buds

1965 ◽  
Vol 18 (3) ◽  
pp. 463 ◽  
Author(s):  
P May
Keyword(s):  
Floral Initiation ◽  
Spectral Quality ◽  
Four Seasons ◽  
Phytochrome System

For four seasons, individual buds developing on sultana vines in the field were shaded with a number of materials during the period of floral initiation. Heavy shading up to complete darkening consistently reduced the number and size of inflorescence primordia. This reduced fruitfulness could not be related to changes in the spectral quality of the light, which might have upset the phytochrome system, nor to changes in temperature of the buds.

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