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The pulsar spectral index distribution [PDF]
Monthly Notices of the Royal Astronomical Society, 2013 The flux density spectra of radio pulsars are known to be steep and, to first order, described by a power-law relationship of the form S_{\nu} \propto \nu^{\alpha}, where S_{\nu} is the flux density at some frequency \nu and \alpha is the spectral index.
Bates, Samuel D. +2 more
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Running Spectral Index from Inflation with Modulations [PDF]
Journal of Cosmology and Astroparticle Physics, 2011 We argue that a large negative running spectral index, if confirmed, might suggest that there are abundant structures in the inflaton potential, which result in a fairly large (both positive and negative) running of the spectral index at all scales.
A.A. Starobinsky +24 more
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Remote Sensing, 2021 The survival rate of seedlings is a decisive factor of afforestation assessment. Generally, ground checking is more accurate than any other methods. However, the survival rate of seedlings can be higher in the growing season, and this can be estimated in
Xuzhan Guo +6 more
doaj +1 more source
Sensors, 2021 The accurate estimation and timely diagnosis of crop nitrogen (N) status can facilitate in-season fertilizer management. In order to evaluate the performance of three leaf and canopy optical sensors in non-destructively diagnosing winter wheat N status ...
Jie Jiang +8 more
doaj +1 more source
ISPRS International Journal of Geo-Information, 2022 Estimation of soil organic matter content (SOMC) is essential for soil quality evaluation. Compared with traditional multispectral remote sensing for SOMC mapping, the distribution of SOMC in a certain area can be obtained quickly by using hyperspectral ...
Yayu Yang +4 more
doaj +1 more source
Remote Sensing, 2022 By studying the spectral information of cotton leaf nitrogen content, sensitive feature bands and spectral indices for leaf nitrogen content were screened, and different methods were used to model the screened feature bands and indices to find a method ...
Xiangyu Chen +5 more
doaj +1 more source
Remote Sensing, 2022 Leaf spot (LS) caused by Cercosporidium personatum is one of the most harmful peanut diseases in the late growth stage and severely affects the yield of peanuts.
Qiang Guan +4 more
doaj +1 more source
Spectral properties of geometric–arithmetic index [PDF]
Applied Mathematics and Computation, 2016 The concept of geometric-arithmetic index was introduced in the chemical graph theory recently, but it has shown to be useful. One of the main aims of algebraic graph theory is to determine how, or whether, properties of graphs are reflected in the algebraic properties of some matrices.
José M. Rodríguez, José M. Sigarreta
openaire +3 more sources
High-Resolution Drone-Acquired RGB Imagery to Estimate Spatial Grape Quality Variability
Agronomy, 2021 Remotesensing techniques can help reduce time and resources spent collecting samples of crops and analyzing quality variables. The main objective of this work was to demonstrate that it is possible to obtain information on the distribution of must ...
Marta García-Fernández +2 more
doaj +1 more source
An adaptive spectral index for carbonate rocks using OLI Landsat-8 imagery
Geocarto International, 2023 The accurate characterization of carbonate rocks is crucial for determining the potential for exploring outcrops in the oil industry. Modern remote sensing instruments have played an important role in estimating mineral characteristics in the most varied
V. F. Sales +8 more
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