Group Vector Space Method for Estimating Melting and Boiling Points of Organic Compounds

2002 ◽  
Vol 41 (22) ◽  
pp. 5534-5537 ◽  
Author(s):  
Xu Wen ◽  
Yang Qiang
Keyword(s):  
Vector Space ◽  
Organic Compounds ◽  
Boiling Points ◽  
Space Method

A method for estimating the boiling points of organic compounds from their melting points

Chemosphere ◽  
1995 ◽  
Vol 31 (4) ◽  
pp. 3001-3008 ◽  
Author(s):  
Andrea E. Walters ◽  
Paul B. Myrdal ◽  
Samuel H. Yalkowsky
Keyword(s):  
Organic Compounds ◽  
Melting Points ◽  
Boiling Points

Design and Implementation of Chinese Information Filtering System

2013 ◽  
Vol 756-759 ◽  
pp. 1164-1167
Author(s):  
Xiu Mei Zhang
Keyword(s):  
Information Processing ◽  
Vector Space ◽  
Information Filtering ◽  
Experimental Results ◽  
Important Research ◽  
Index Method ◽  
Network Information ◽  
Design And Implementation ◽  
Tree Index ◽  
Space Method

With the development of the network information, information processing is vital in all aspects. Information filtering is more important research aspect. Especially Chinese information filtering is urgent affairs. According to research of the domestic and abroad, in the article vector space method and hyB+ tree index method is combined to filter text. Experimental results show that, this method is feasible.

scholarly journals XVI. On the relation between boiling-point and composition organic compounds

1860 ◽  
Vol 150 ◽  
pp. 257-276 ◽  
Keyword(s):  
Chemical Composition ◽  
Organic Compounds ◽  
Boiling Point ◽  
Royal Society ◽  
Chemical Compounds ◽  
Molecular Volume ◽  
Isomeric Compound ◽  
Boiling Points ◽  
Constituent Elements ◽  
Further Development

The researches which I beg, in the following pages, to submit to the Royal Society, embody the results obtained in the further development of an observation which I made a considerable number of years ago, and which, since that time, I had to defend against the objections of others, both by experimental inquiries of my own, and by the collection and discussion of facts elicited in the investigations of other observers. As far back as 1841* I pointed out that in analogous compounds the same difference of composition frequently involves the same difference in boiling-points. The assertion of the existence of this law-like relation between the chemical composition of substances and one of their most important physical properties, when first enunciated, met rather with the opposition than with the assent of chemists. In Germany especially it was contested by Schröder in his memoir “On the Molecular Volume of Chemical Compounds.” These objections led me to collect additional evidence in favour of my views, and to show more particularly that in very extensive series of compounds (alcohols C n H n+2 O 2 ; acids C n H n O 4 ; compound ethers C n H n O 4 , &c.) an elementary difference x C 2 H 2 is attended by a difference of x X 19°C. in the boiling-points, and how this fact is intimately connected with other regularities exhibited by the boiling-points of organic compounds. Almost at the same period Schröder § convinced himself that the relation I had pointed out obtains in most cases. He collected himself a considerable number of illustrations of the regularities I had traced, and showed that the relation in question is rendered more especially conspicuous if the compounds be expressed by formulæ representing equal vapour-volumes of the several substances. Some of the views, however, which were peculiar to Schröder have not gained the approbation of chemists. This physicist was inclined to consider the boiling-point of a substance as the most essential criterion of its proximate constituents, as the most trustworthy indicator of its molecular consti­tution. His views were chiefly based upon the assumption that the elementary difference C 2 H 2 , when occurring in alcohols C n H n+2 O 2 , involved a difference of boiling-points other than that occasioned by the same elementary difference obtaining in acids C n H n O 4 and that the isomeric compound ethers differed from one another in their boiling-points. An extensive series of boiling-point determinations* which I made of these isomeric ethers, proved that the latter assumption is not founded on facts. The exertions made by Schröder, Gerhardt, Löwig and others, in the hope of recognizing the influence of the constituent elements on the boiling-point of a compound, have also essentially remained without result.

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