Search for dissertations about: "substitution"

Showing result 21 - 25 of 735 swedish dissertations containing the word substitution.

  2. 21. Meniscectomy, meniscal repair, and prosthetic substitution : Clinical and experimental investigations

    Author : Karola Messner; Linköpings universitet; []
    Keywords : MEDICINE; MEDICIN;

    Abstract : This study comprising 7 papers is concerned with different treatment of meniscal injuries. The aim was to analyse today's clinical methods and the possibility for prosthetic substitution in the future. Open peripheral meniscal repair was compared with partial arthroscopic meniscectomy in a 7·year follow-up evaluation of 130 patients. READ MORE

  4. 22. The role of wastepaper in the pulp and paper industry : investments, technical change and factor substitution

    Author : Robert Lundmark; Luleå tekniska universitet; []
    Keywords : SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Economics; Nationalekonomi;

    Abstract : Environmental concerns, both public and private, has resulted in, among other things, an increased wastepaper recovery. The segment of the economy this has had a major impact on is the pulp and paper industry since they are the prime user of wastepaper in the production of paper and paperboard. READ MORE

  5. 23. Computer-Assisted Organic Synthesis. Addition to Carbonyl Carbons and Aromatic Substitution

    Author : Ingvar Lagerstedt; Chalmers tekniska högskola; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; CAOS; torsional strain; selectivity; aromatic substitution reaction;

    Abstract : This thesis concerns the computer-assisted modelling of additions to ketones and aromatic substitution, and how this modelling can be used within an existing program for synthesis planning. I include a review of existing computer-assisted organic synthesis (CAOS) programs, and discuss how some of these programs deal with knowledge representation. READ MORE

  6. 24. Quantum Chemical Studies of Aromatic Substitution Reactions

    Author : Magnus Liljenberg; Tore Brinck; Leif Eriksson; KTH; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Teoretisk kemi och biologi; Theoretical Chemistry and Biology;

    Abstract : In this thesis, density functional theory (DFT) is used to investigate the mechanisms and reactivities of electrophilic and nucleophilic aromatic substitution reactions (SEAr and SNAr respectively). For SEAr, the σ-complex intermediate is preceded by one (halogenation) or two (nitration) π-complex intermediates. READ MORE

  7. 25. Palladium-catalyzed aromatic coupling and allylic substitution

    Author : Helena Hagelin; KTH; []
    Keywords : ;

    Abstract : Different types of palladium(II)-catalyzed aromatic couplingreactions have been investigated.The cyclization of diphenyl ether was found to be moresensitive to reaction conditions than was the cyclization ofthe diphenylamine derivatives. READ MORE