Ignition of a ballistite propellant by light radiation

1970 ◽  
Vol 4 (1) ◽  
pp. 1-4 ◽  
Author(s):  
V. F. Mikheev ◽  
A. A. Koval'skii ◽  
S. S. Khlevnoi
Keyword(s):  
Light Radiation ◽  
Ballistite Propellant

On the photoreactivity of some hardwood species studied by their leaf characteristics

1970 ◽  
Vol 23 ◽  
Author(s):  
M. Van Miegroet
Keyword(s):  
Morphological Characteristics ◽  
Vegetation Period ◽  
Forest Stand ◽  
Light Environment ◽  
Light Radiation ◽  
Light Conditions ◽  
Site Factors ◽  
Leaf Characteristics ◽  
Single Tree ◽  
Changing Light

A  certain number of measurable characteristics of tree leaves (morphological  characteristics, absorption of light radiation, intensity of respiration and  photosynthesis) are clearly linked with the presence of physiologically  active pigments in the leaves.     Leaf characteristics are highly and inequally influenced by changing  conditions of light environment, especially those related to light intensity,  light quality and duration of the daily illumination period. These  modifications do not only apply to light radiation as created under  laboratory conditions, but also to light conditions ensuing from the place in  the crown of a single tree, the social position of the tree in a forest stand  and the site factors in general.     There are also changes taking place due to the progression of the  vegetation period, at the end of which all species are less tolerant or more  light demanding. The reaction of the leaves towards light radiation out of  different regions of the spectrum is also different. The so-called blue light  radiation (λmax = 440 nm) seems to be of the greatest importance in this  relation, as species react quite different to its action.     The biggest variation in leaf characteristics due to changing light  environment was measured for oak and beech, which both react quickly and are  qualified as 'photolabile species'. No important variations occur in leaves  of ash and maple, which therefore are qualified as 'photostable species'.      As a consequence of variable reactions to changing light conditions, the  relationships between the species are continually modified, even in such a  way that their potential for dominance is not constant.     The classical division into tolerant and intolerant species or  classification of the species based upon the degree of light demand, is  highly inaccurate and it seems preferable to speak of relative light demands  and relative tolerance. All these observations and conclusions bring about a  clear confirmation of the necessity to recognize the individuality of the  single tree, the special character of each growth condition, the own  structure of each forest stand, the specific reaction to one sided  modifications of environmental factors. This is especially important for an  intensive sylvicultural practice.     They also prove the necessity for more physiological and biochemical  research to arrive at a better understanding of growth and its mechanism.      Sylviculture in fact must try to regulate, on an expanded scale, the  phenomens of growth, which is the exchange, absorption and transformation of  energy.     A practical interpretation and regulation of fundamental laws of physiology  and growth will be possible as soon as a clinical form of sylviculture is  created and the adequate instrumentarium developed.

scholarly journals Enhanced Photocatalytic Activity of Spherical Nd3+ Substituted ZnFe2O4 Nanoparticles

Materials ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2054
Author(s):  
Loan T. T. Nguyen ◽  
Hang T. T. Nguyen ◽  
Thieng H. Le ◽  
Lan T. H. Nguyen ◽  
Hai Q. Nguyen ◽  
...  
Keyword(s):  
Grain Size ◽  
Photocatalytic Activity ◽  
Dye Removal ◽  
Catalyst Loading ◽  
Separation Mechanism ◽  
Light Radiation ◽  
Efficient Separation ◽  
Oxidant Concentration ◽  
Znfe2o4 Nanoparticles ◽  
Removal Efficiencies

In this study, nanocrystalline ZnNdxFe2−xO4 ferrites with x = 0.0, 0.01, 0.03 and 0.05 were fabricated and used as a catalyst for dye removal potential. The effect of Nd3+ ions substitution on the structural, optical and photo-Fenton activity of ZnNdxFe2−xO4 has been investigated. The addition of Nd3+ ions caused a decrease in the grain size of ferrites, the reduction of the optical bandgap energies and thus could be well exploited for the catalytic study. The photocatalytic activity of the ferrite samples was evaluated by the degradation of Rhodamine B (RhB) in the presence of H2O2 under visible light radiation. The results indicated that the ZnNdxFe2−xO4 samples exhibited higher removal efficiencies than the pure ZnFe2O4 ferrites. The highest degradation efficiency was 98.00%, attained after 210 min using the ZnNd0.03Fe1.97O4 sample. The enhanced photocatalytic activity of the ZnFe2O4 doped with Nd3+ is explained due to the efficient separation mechanism of photoinduced electron and holes. The effect of various factors (H2O2 oxidant concentration and catalyst loading) on the degradation of RhB dye was clarified.

Beam profile measurements based on light radiation of atoms excited by the particle beam

2007 ◽  
Author(s):  
J. Dietrich ◽  
C. Boehme ◽  
T. Weis ◽  
A.H. Botha ◽  
J.L. Conradie ◽  
...  
Keyword(s):  
Particle Beam ◽  
Beam Profile ◽  
Light Radiation

Light, Radiation, and Academic Behavior

1974 ◽  
Vol 10 (1) ◽  
pp. 33-47 ◽  
Author(s):  
Lewis W. Mayron ◽  
John Ott ◽  
Rick Nations ◽  
Ellen L. Mayron
Keyword(s):  
Light Radiation ◽  
Academic Behavior

Influences of ultra‐violet (UV)‐blue light radiation on the growth of cotton. II. Photosynthesis, leaf anatomy, and iron reduction

1987 ◽  
Vol 10 (17) ◽  
pp. 2283-2297 ◽  
Author(s):  
James C. Pushnik ◽  
Gene W. Miller ◽  
Von D. Jolley ◽  
John C. Brown ◽  
Tim D. Davis ◽  
...  
Keyword(s):  
Blue Light ◽  
Leaf Anatomy ◽  
Iron Reduction ◽  
Ultra Violet ◽  
Light Radiation

Design and characterization of a novel indicator dosimeter for blue-light radiation

2009 ◽  
Vol 36 (2) ◽  
pp. 642-644 ◽  
Author(s):  
G. R. Ferreira ◽  
C. K. B. de Vasconcelos ◽  
R. F. Bianchi
Keyword(s):  
Blue Light ◽  
Light Radiation
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