scholarly journals Laser-induced fluorescence spectroscopic study of reactive plasma. The absolute density and spatial distribution of Si atoms in silane discharege.

1989 ◽  
Vol 17 (8) ◽  
pp. 578-585
Author(s):  
Yoshitaka TAKUBO ◽  
Manabu YAMAMOTO
Keyword(s):  
Spatial Distribution ◽  
Spectroscopic Study ◽  
Laser Induced Fluorescence ◽  
Reactive Plasma ◽  
Absolute Density ◽  
The Absolute

Absolute density measurement of nitrogen dioxide with cavity-enhanced laser-induced fluorescence

2018 ◽  
Vol 27 (10) ◽  
pp. 100601
Author(s):  
Zheng-Hai Yang ◽  
Yong-Cheng Yang ◽  
Lian-Zhong Deng ◽  
Jian-Ping Yin
Keyword(s):  
Nitrogen Dioxide ◽  
Density Measurement ◽  
Laser Induced Fluorescence ◽  
Absolute Density

PROBE — Profile Resolution Obtained by Excitation

1978 ◽  
Vol 32 (4) ◽  
pp. 381-388 ◽  
Author(s):  
R. M. Measures
Keyword(s):  
Spatial Distribution ◽  
Spatial Resolution ◽  
Pump Pulse ◽  
Probe Pulse ◽  
Laser Pulses ◽  
Laser Induced Fluorescence ◽  
Line Of Sight ◽  
Theoretical Formulation ◽  
New Approach ◽  
Fluorescence Methods

A new approach for evaluating, with spatial resolution, the line of sight properties of a specific constituent is proposed. This PROBE (profile resolution obtained by excitation) concept involves the use of two counter-propagating laser pulses; a pump pulse to condition the medium and a probe pulse to interrogate the medium where the pulses overlap. In this way, information regarding the spatial distribution of a species is transformed into temporal information in the form of a change in the amplitude of a returned probe pulse. For certain situations the PROBE technique offers several advantages over scattering or laser induced fluorescence methods. A theoretical formulation of the concept clearly indicates the importance of the lifetime of the pumped state.

Estimation of the Absolute Density of Glass Following the Sink/Float Technique

1987 ◽  
Vol 32 (1) ◽  
pp. 12329J ◽  
Author(s):  
David Kahane ◽  
John I. Thornton
Keyword(s):  
Absolute Density ◽  
The Absolute

scholarly journals SPATIAL DISTRIBUTION AND STRUCTURAL VARIATION OF Copaifera arenicola IN A CAATINGA FRAGMENT

FLORESTA ◽  
2020 ◽  
Vol 50 (3) ◽  
pp. 1660
Author(s):  
Dráuzio Correia Gama ◽  
Robério Anastácio Ferreira ◽  
Janisson Batista de Jesus ◽  
José Monteiro do Nascimento Júnior
Keyword(s):  
Spatial Distribution ◽  
Tree Species ◽  
Structural Variation ◽  
Basal Area ◽  
Stable Population ◽  
Distribution Analysis ◽  
Expansion Phase ◽  
Breast Height ◽  
Absolute Density ◽  
Univariate Function

The study of spatial distribution of tree populations has proven to be important for revealing how individuals are horizontally organized in the environment, facilitating the structural understanding and forms of colonization and dispersion of propagules. The present work aimed at studying the pattern of spatial distribution of tree species Copaiferaarenicola [(Ducke) J. Costa e L.P.Queiroz] and its structural relation with the altimetric profile in a Caatinga fragment in Ribeira do Pombal municipality, Bahia. Census of all individuals in the area with circumference at breast height (CBH) ≥ 6 cm was performed. The spatial distribution analysis was conducted for the whole population using Ripley K univariate function, with maximum search radius (h) of 128 m. 409 individuals were found, corresponding to absolute density of 89.49 ind. ha-1 and 0.681 m². ha-1 of basal area. The group of C. arenicola individuals corresponds to a stable population in expansion phase, presenting higher number of young and medium individuals. The pattern of spatial distribution of individuals in the area under study was the uniform arrangement. None of the altimetric classes of the area had a different influence on the structure and distribution of arboreal individuals.

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