The Spectral Characteristics of Pre-Quaternary Climatic Records, an Example of the Relationship between the Astronomical Theory and Geo-Sciences

1989 ◽  
pp. 47-76 ◽  
Author(s):  
A. Berger
Keyword(s):  
Spectral Characteristics ◽  
Astronomical Theory ◽  
The Relationship ◽  
Climatic Records

scholarly journals Spectral Indices: In-Season Dry Mass and Yield Relationship of Flue-Cured Tobacco under Different Planting Dates and Fertiliser Levels

ISRN Agronomy ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ezekia Svotwa ◽  
J. Anxious Masuka ◽  
Barbara Maasdorp ◽  
Amon Murwira
Keyword(s):  
Spectral Characteristics ◽  
Dry Mass ◽  
Coefficient Of Determination ◽  
Planting Dates ◽  
Randomized Design ◽  
Crop Development ◽  
Best Fitting ◽  
Whole Plants ◽  
Relationship Of ◽  
The Relationship

This experiment investigated the relationship between tobacco canopy spectral characteristics and tobacco biomass. A completely randomized design, with plantings on the 15th of September, October, November, and December, each with 9 variety × fertiliser management treatments, was used. Starting from 6 weeks after planting, reflectance measurements were taken from one row, using a multispectral radiometer. Individual plants from the other 3 rows were also measured, and the above ground whole plants were harvested and dried for reflectance/dry mass regression analysis. The central row was harvested, cured, and weighed. Both the maximum NDVI and mass at untying declined with later planting and so was the mass-NDVI coefficient of determination. The best fitting curves for the yield-NDVI correlations were quadratic. September reflectance values from the October crop reflectance were statistically similar (P>0.05), while those for the November and the December crops were significantly different (P<0.05) from the former two. Mass at untying and NDVI showed a quadratic relationship in all the three tested varieties. The optimum stage for collecting spectral data for tobacco yield estimation was the 8–12 weeks after planting. The results could be useful in accurate monitoring of crop development patterns for yield forecasting purposes.

scholarly journals Investigation of the relationship between optical auroral forms and HF radar E region backscatter

2000 ◽  
Vol 18 (6) ◽  
pp. 608-617 ◽  
Author(s):  
S. E. Milan ◽  
M. Lester ◽  
N. Sato ◽  
H. Takizawa ◽  
J.-P. Villain
Keyword(s):  
Spectral Characteristics ◽  
Hf Radar ◽  
Vhf Radar ◽  
The Past ◽  
Optical Signature ◽  
E Region ◽  
Coherent Backscatter ◽  
First Time ◽  
The Relationship ◽  
East West

Abstract. The SuperDARN HF radars have been employed in the past to investigate the spectral characteristics of coherent backscatter from L-shell aligned features in the auroral E region. The present study employs all-sky camera observations of the aurora from Husafell, Iceland, and the two SuperDARN radars located on Iceland, Þykkvibær and Stokkseyri, to determine the optical signature of such backscatter features. It is shown that, especially during quiet geomagnetic conditions, the backscatter region is closely associated with east-west aligned diffuse auroral features, and that the two move in tandem with each other. This association between optical and radar aurora has repercussions for the instability mechanisms responsible for generating the E region irregularities from which radars scatter. This is discussed and compared with previous studies investigating the relationship between optical and VHF radar aurora. In addition, although it is known that E region backscatter is commonly observed by SuperDARN radars, the present study demonstrates for the first time that multiple radars can observe the same feature to extend over at least 3 h of magnetic local time, allowing precipitation features to be mapped over large portions of the auroral zone.Key words: Ionosphere (particle precipitation; plasma waves and instabilities)

scholarly journals Modeling the Relationships between the Height and Spectrum of Submerged Tufa Barrage Using UAV-Derived Geometric Bathymetry and Digital Orthoimages

Sensors ◽  
2021 ◽  
Vol 21 (21) ◽  
pp. 6987
Author(s):  
Jinchen He ◽  
Jiayuan Lin ◽  
Yanhao Xu
Keyword(s):  
Nature Reserve ◽  
Low Cost ◽  
Spectral Characteristics ◽  
Future Research ◽  
Contact Method ◽  
Ratio Analysis ◽  
Band Ratio ◽  
Sedimentary Records ◽  
Evolution And Development ◽  
The Relationship

Tufa barrages play an important role in fluviatile tufa ecosystems and sedimentary records. Quantifying the height of tufa barrage is significant for understanding the evolution and development of the Holocene tufa barrage systems. However, for submerged tufa barrages, there is no low-cost non-contact method to retrieve barrage height. Generally, it is difficult to recognize small tufa barrages by means of remotely sensed satellite data, but the combination of unmanned aerial vehicles (UAV) and Structure-from-Motion (SfM) photogrammetry makes it possible. In this study, we used a fixed-wing UAV and a consumer-grade camera to acquire images of the submerged tufa barrage in Lying Dragon Lake, Jiuzhaigou National Nature Reserve, China, and estimated the height of the tufa barrage through UAV-based photogrammetric bathymetry. On this foundation, the relationship between barrage height and its spectrum was established through band ratio analysis using UAV-derived geometric bathymetry and digital orthoimages, which provided an alternative strategy to characterize the height of submerged tufa barrages. However, the spectral characteristics of submerged tufa barrages will oscillate with changes in the environmental conditions. In future research, we will consider using a dedicated aquatic multispectral camera to improve the experimentation.

Identification of Grape Varieties

1964 ◽  
Vol 47 (4) ◽  
pp. 671-676
Author(s):  
A C Rice
Keyword(s):  
Spectral Response ◽  
Spectral Characteristics ◽  
Grape Juice ◽  
Concord Grape ◽  
Grape Juices ◽  
Two Peaks ◽  
Relationship Of ◽  
Grape Varieties ◽  
The Relationship

Abstract A series of grape juices and concentrates were diluted with Macllvaine’s buffer at pH levels ranging from 2 to 8 and analyzed spectrophotometrically. The relationship of various Concord and California grape juice samples from different geographical areas were characterized individually and in combination. The spectral characteristics of Concord and Salvador grape juice were found to be similar except at pH 7, where the Concord curve has two peaks (583 and 450 mμ) and the Salvador curve has only one. The anthocyanin components in Concord grape juice were studied chromatographically for an explanation of its unique spectral response at pH 7. Results are incomplete, and further study is recommended.

Polyimide Electronic Structural and Optical Properties from First Principles Calculations

2011 ◽  
Vol 694 ◽  
pp. 597-601
Author(s):  
Jia Qi Lin ◽  
Jing Leng ◽  
Ming Hui Xia ◽  
Jun Hui Shi ◽  
Qing Guo Chi
Keyword(s):  
Optical Properties ◽  
Band Structure ◽  
Band Gap ◽  
First Principles ◽  
Energy Band ◽  
Spectral Characteristics ◽  
Energy Band Structure ◽  
First Principles Calculations ◽  
Structural And Optical Properties ◽  
The Relationship

The electronic structural and optical properties of Polyimide (PI) are studied by first principle method of density theory. It is shown that molecules orbit contribution of PI is derived from carbon 2p orbital and oxygen 2p orbital, respectively,and the band gap from the energy band structure is much smaller than that of the experimental value. It is also found that the band gap calculated from the absorption edge of absorption spectra is in agreement with the result of the energy band structure. Furthermore, the relationship between the formation of dielectric function peaks and other spectral characteristics is interpreted.

The relationship between spectral characteristics and perceived hypernasality in children

2001 ◽  
Vol 109 (5) ◽  
pp. 2181-2189 ◽  
Author(s):  
Ryuta Kataoka ◽  
Donald W. Warren ◽  
David J. Zajac ◽  
Robert Mayo ◽  
Richard W. Lutz
Keyword(s):  
Spectral Characteristics ◽  
The Relationship

scholarly journals Study of physico-chemical properties of potential beta-adrenolytics

2014 ◽  
Vol 61 (2) ◽  
pp. 49-54
Author(s):  
M. Stankovičová ◽  
Ž. Bezáková ◽  
P. Mokrý ◽  
P. Salát ◽  
M. Kočík ◽  
...  
Keyword(s):  
Partition Coefficients ◽  
Spectral Characteristics ◽  
Chemical Properties ◽  
Side Chain ◽  
Log P ◽  
Structure Activity ◽  
Physico Chemical ◽  
The Relationship ◽  
Layer Chromatography ◽  
Derivatives Of

Abstract The aim of this paper is the study of physico-chemical properties of the chosen compounds, derivatives of 2-hydroxy-3-[2-(4-methoxyphenyl) ethylamino]propyl-4-[(alkoxycarbonyl)amino]benzoates and 2-hydroxy-3-[2-(2-methoxyphenyl)ethylamino]propyl-4-[(alkoxycarbonyl) amino]benzoates with potential ultra-short beta-adrenolytic activity. The studied compounds are different in the position of the substituent on the benzene ring in the side chain as well as in the aromatic ring in position 4 with alkyl- (methylto butyl-) carbamate. The physico-chemical characteristics, for example, lipophilicity, surface activity, adsorbability, acidobasic properties etc., are very important for the explanation of the relationship between structure and biological activity of the drug. These parameters serve as the base of quantitative structure-activity study. The goal of this work is to establish the spectral characteristics of studied compounds in UV-area, pKa values, the parameters of lipophilicity (the values of Rf and RM from thin layer chromatography, retention time t´R and capacity factor k´ from liquid chromatography and experimental partition coefficients log P´ values), surface tension, critical micelle concentrations, the adsorbability of compounds expressed by percent of adsorbed compound on active charcoal β% as well as by Freundlich adsorption isotherms. The obtained values are correlated with the parameters characterising the size of molecule, for example, the number of carbon atoms on carbamate functional group.

Study on the Screening Efficiency for the Probability Screen

2011 ◽  
Vol 314-316 ◽  
pp. 2238-2242
Author(s):  
Qin Tang ◽  
Yi Jian Huang
Keyword(s):  
Correlation Dimension ◽  
Spectral Characteristics ◽  
Vibration Signal ◽  
Ar Model ◽  
Screening Efficiency ◽  
The Relationship

Abstract: The evolution of the screening efficiency for the probability screen was given in this paper. Trispectrum based on AR model was estimated with the vibration signal obtained from the probability screen. The relevance between trispectral slices and screening efficiency was analyzed qualitatively. The evolution of screening efficiency was also discussed in detail with a statistical quantity, i.e., kurtosis(K); In addition, the relationship between the correlation dimension and screening efficiency was analyzed quantitatively. The results show that the relevance between the spectral characteristics and screening efficiency is consistent with the relationship between the correlation dimension and screening efficiency.

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