scholarly journals XXXIII. Observations on M. Reiset's remarks on the new method for the estimation of nitrogen in organic compounds, and also on the supposed part which the nitrogen of the atmosphere plays in the formation of ammonia

1841 ◽  
Vol 1 ◽  
pp. 197
Author(s):  
H. Will
Keyword(s):  
2020 ◽  
Vol 2020 ◽  
pp. 1-6
Author(s):  
Yalan Li ◽  
Bo Deng

The Wiener index is defined as the summation of distances between all pairs of vertices in a graph or in a hypergraph. Both models—graph-theoretical and hypergraph-theoretical—are used in mathematical chemistry for quantitatively studying physical and chemical properties of classical and nonclassical organic compounds. In this paper, we consider relationships between hypertrees and trees and hypercycles and cycles with respect to their Wiener indices.


Nature ◽  
1953 ◽  
Vol 172 (4384) ◽  
pp. 862-863
Author(s):  
R. C. VASISTH ◽  
M. S. MUTHANA
Keyword(s):  

2019 ◽  
Vol 64 (7) ◽  
pp. 857-863 ◽  
Author(s):  
Z. A. Fattakhova ◽  
G. S. Zakharova ◽  
E. I. Andreikov ◽  
I. S. Puzyrev
Keyword(s):  

2012 ◽  
Vol 12 (17) ◽  
pp. 8009-8020 ◽  
Author(s):  
J. Mao ◽  
X. Ren ◽  
L. Zhang ◽  
D. M. Van Duin ◽  
R. C. Cohen ◽  
...  

Abstract. The understanding of oxidation in forest atmospheres is being challenged by measurements of unexpectedly large amounts of hydroxyl (OH). A significant number of these OH measurements were made by laser-induced fluorescence in low-pressure detection chambers (called Fluorescence Assay with Gas Expansion (FAGE)) using the Penn State Ground-based Tropospheric Hydrogen Oxides Sensor (GTHOS). We deployed a new chemical removal method to measure OH in parallel with the traditional FAGE method in a California forest. The new method gives on average only 40–60% of the OH from the traditional method and this discrepancy is temperature dependent. Evidence indicates that the new method measures atmospheric OH while the traditional method is affected by internally generated OH, possibly from oxidation of biogenic volatile organic compounds. The improved agreement between OH measured by this new technique and modeled OH suggests that oxidation chemistry in at least one forest atmosphere is better understood than previously thought.


1953 ◽  
Vol 41 (1-2) ◽  
pp. 51-57 ◽  
Author(s):  
R. Belcher ◽  
A. J. Nutten ◽  
W. I. Stephen
Keyword(s):  

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