Sökning: "linear free energy relationships"

Visar resultat 11 - 14 av 14 avhandlingar innehållade orden linear free energy relationships.

1. 11. Mechanisms for Solvolytic Elimination and Substitution Reactions Involving Short-lived Carbocation Intermediates

   Författare :Xiaofeng Zeng; Einar Uggerud; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organic chemistry; Organisk kemi; Organic chemistry; Organisk kemi; organisk kemi; Organic Chemistry;

   Sammanfattning : Solvolysis reactions of a range of tertiary substrates in largely aqueous solvents were studied in such respects as β-deuterium kinetic isotope effects, linear free energy relationships and stereochemistry.Solvolysis of the fluorene derivatives 9-methyl–9-(2´-X-2´-propyl)fluorene (1-X, X = Cl, Br, OOCCF3) involves a very short-lived carbocation intermediate. LÄS MER

3. 12. Bioavailability of organic contaminants in a changing climate

   Författare :Matyas Ripszam; Peter Haglund; Roland Kallenborn; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; climate change; organic contaminants; sorption; dissolved organic carbon; bioavailability;

   Sammanfattning : The effects of predicted future climate change was investigated with special emphasis on the association of organic contaminants with dissolved organic carbon (DOC) in the Baltic Sea.An automated method was developed for the measurements of DOC - water distribution constants at realistic DOC concentrations in brackish water. LÄS MER

4. 13. Partitioning and persistence of volatile methylsiloxanes in aquatic environments

   Författare :Dimitrios Panagopoulos; Matthew MacLeod; Annika Jahnke; Amelie Kierkegaard; Whelan Mick; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; siloxanes; organic carbon; sediment; partitioning; persistence; Applied Environmental Science; tillämpad miljövetenskap;

   Sammanfattning : The presence of volatile methylsiloxanes (VMS) in the environment has raised concerns among environmental chemists and regulators about their persistence and the risks they may pose to the environment. This thesis explores the partitioning and persistence of VMS in aquatic environments. LÄS MER

5. 14. Some Basic Problems in Rock Breakage by Blasting and by Indentation

   Författare :S.Q. Kou; Luleå tekniska universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

   Sammanfattning : This thesis is devoted to discussing some basic problems in rock breakage by blasting and by mechanical excavation, and contains a detailed summary and six appended papers numbered as Papers A to F. The central problem treated in this thesis is the interaction between either explosion products or mechanical tools and rock. LÄS MER