scholarly journals Single-beam lifetime measurements via self-induced optical absorption

2019 ◽  
Vol 27 (4) ◽  
pp. 4445 ◽  
Author(s):  
Kevin M. W. Boyd ◽  
Rafael N. Kleiman
Keyword(s):  
Optical Absorption ◽  
Lifetime Measurements ◽  
Single Beam ◽  
Beam Lifetime

Study on the Photosynthetic Efficiency of the Bauhinia blakeana Leaves by Using Photo-Acoustic Tomography Technology

2013 ◽  
Vol 807-809 ◽  
pp. 1010-1014
Author(s):  
Gan Wen Lie ◽  
Guang Hua Lie ◽  
Ding Chao Pan ◽  
Long Hua Ye ◽  
Dong Yu Li
Keyword(s):  
Optical Absorption ◽  
Photosynthetic Efficiency ◽  
Photosynthetic Pigment ◽  
Pigment Content ◽  
Optical Absorption Coefficient ◽  
Growth Time ◽  
Acoustic Tomography ◽  
Single Beam ◽  
Green Leaves ◽  
Photosynthetic Pigment Content

By using a new kind of single-beam normalized photo-acoustic tomography spectroscopy (PAS-CT) technology with non-damage detection, the photo-acoustic tomography spectroscopy and optical absorption properties of green and yellow leaves ofBauhinia blakeanawere studied. The results show that: the photo-acoustic tomography spectroscopy ofBauhinia blakeanaleaves could be obtained from different chopping frequency and different sample positions, and photosynthetic pigment content of their leaves is closely related to their photosynthetic intensity. The more photosynthetic pigment content the leaves ofBauhinia blakeanacontain, the bigger optical absorption coefficient and the higher photosynthetic efficiency they have. The photosynthetic pigment content of the green leaves ofBauhinia blakeanais higher than that of the yellow ones. As a result, the photosynthesis of green leaves is better than that of the yellow ones. According to the results of our research, the photosynthetic efficiency ofBauhinia blakeanacould be improved and its growth time could be effectively controlled to enhance the growth ofBauhinia blakeana. Furthermore, it could play an important role on the development of forestry, and meet the need of forest for 6 billion people. The research showed high science value to the study and applications of the photosynthesis of plants.

Pulsed beam lifetime measurements in 64Cu, 59Ni, 65Zn, 45,47,49Ti and 47,49,50,51V

1976 ◽  
Vol 260 (2) ◽  
pp. 189-212 ◽  
Author(s):  
D.C.S. White ◽  
W.J. McDonald ◽  
D.A. Hutcheon ◽  
G.C. Neilson
Keyword(s):  
Lifetime Measurements ◽  
Beam Lifetime

Study on the Photosynthetic Efficiency of the Michelia alba Leaves by Using Photo-Acoustic Tomography Spectroscopy Technology

2012 ◽  
Vol 535-537 ◽  
pp. 2429-2433
Author(s):  
Guang Hua Lie ◽  
Gan Wen Lie ◽  
Xiao Qiong Feng ◽  
Ting Yang ◽  
Dao Qing Zhang ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Damage Detection ◽  
Photosynthetic Efficiency ◽  
Photosynthetic Pigment ◽  
Pigment Content ◽  
Optical Absorption Coefficient ◽  
Acoustic Tomography ◽  
Single Beam ◽  
Photosynthetic Pigment Content

By using a new kind of single-beam normalized photo-acoustic tomography spectroscopy (PAS-CT) technology with non-damage detection, the photo-acoustic tomography spectroscopy, optical absorption properties and photosynthetic pigment content of the green and yellow leaves of Michelia alba were studied. The results show that: photo-acoustic tomography spectroscopy could be obtained from different chopping frequency and different sample position. The more photosynthetic pigment content the leaves of Michelia alba contains, the bigger optical absorption coefficient and the higher photosynthetic efficiency they have. In the research, we could find that the photosynthetic pigment content of the green leaves of Michelia alba is higher than that of the yellow ones. As a result, the optical absorption coefficient and the photosynthetic efficiency of the green ones are higher than the yellow ones. The photo-acoustic tomography spectroscopy technology could be a kind of non-damage detection to confirm the growth of trees.

Reactions of Substituted Vinyl Cations in Acetonitrile Solution as Studied by Flash Photolysis, Part II

1992 ◽  
Vol 47 (9) ◽  
pp. 1319-1323 ◽  
Author(s):  
Shinjiro Kobayashi ◽  
Wolfram Schnabel
Keyword(s):  
Optical Absorption ◽  
Rate Constants ◽  
Steric Effect ◽  
Flash Photolysis ◽  
Aliphatic Alcohols ◽  
Acetonitrile Solution ◽  
Lifetime Measurements ◽  
Absorption Measurements

Vinyl cations of the structure were generated by flash photolysis of the corresponding halides. Lifetime measurements with the aid of optical absorption measurements yielded bimolecular rate constants k2 of the reaction of I+ with tetrahydrofuran and several aliphatic alcohols. On the basis of k2 values the steric effect of various substituents R1 and R2 at C2 and the combined mesomeric (+M) and inductive (-1) effect of substituent groups at C1 on the electrophilicity of I+ have been elucidated.

Optimization of Ce Content in CexLa1-xF3 Colloidal Nanocrystals for Gamma Radiation Detection

2009 ◽  
Vol 1164 ◽  
Author(s):  
Nathan J Withers ◽  
Krishnaprasad Sankar ◽  
John B Plumley ◽  
Brian A Akins ◽  
Tosifa A Memon ◽  
...  
Keyword(s):  
Steady State ◽  
Optical Absorption ◽  
Gamma Radiation ◽  
Radiation Detection ◽  
Colloidal Nanocrystals ◽  
Experimental Investigations ◽  
Lanthanum Fluoride ◽  
Lifetime Measurements ◽  
X Ray ◽  
Ce Content

AbstractWe report on experimental investigations of CexLa1-xF3 colloidal nanocrystals (CNCs) and their properties in function of Ce content. The CNCs were characterized by TEM, energy-dispersive X-ray spectroscopy (EDS), steady-state UV-VIS optical absorption and photoluminescence (PL) spectroscopy, and by PL lifetime measurements. We also report on observations of scintillation from the cerium-doped lanthanum fluoride CNC material in experiments on radiation detection.

Measure of the Photosynthetic Efficiency of the Ficus Altissima Leaves by Using Photo-Acoustic Tomography Spectroscopy Technology

2011 ◽  
Vol 415-417 ◽  
pp. 1219-1224 ◽  
Author(s):  
Guang Hua Lie ◽  
Gan Wen Lie ◽  
Zhi Lie Tang ◽  
Ting Yang ◽  
Wei Dong ◽  
...  
Keyword(s):  
Optical Absorption ◽  
Absorption Coefficient ◽  
Photosynthetic Efficiency ◽  
Photosynthetic Pigment ◽  
Pigment Content ◽  
Optical Absorption Coefficient ◽  
Acoustic Tomography ◽  
Single Beam ◽  
Photosynthetic Pigment Content ◽  
Ct Technology

By using a new kind of single-beam normalized photo-acoustic tomography spectroscopy (PAS-CT) technology with non-damage and weak signals detection, the photo-acoustic tomography spectroscopy, optical absorption properties and photosynthetic pigment content of the green and yellow leaves of Ficus altissima were studied. The results showed that: photo-acoustic tomography spectroscopy could be obtained from different chopping frequency. The more photosynthetic pigment content the leaves of Ficus altissima contain, the bigger optical absorption coefficient and the higher photosynthetic efficiency they have. In the research, we could find that the photosynthetic pigment content of the yellow leaves of Ficus altissma is lower than that of the green ones. As a result, the optical absorption coefficient and the photosynthetic efficiency of the yellow ones were smaller and lower than the green ones. The photo-acoustic tomography spectroscopy technology can be a kind of non-damage detection to confirm the growth of trees. It could make benefits to the controlled environmental forestry and increase forest production to meet the need of forest for 6 billion people. The research showed high practical value to the study and application of the photosynthesis of plants.

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