Sökning: "group reactions"

Visar resultat 1 - 5 av 480 avhandlingar innehållade orden group reactions.

  1. 1. Relativa betyg : några empiriska studier och en teoretisk genomgång i ett historiskt perspektiv

    Författare :Håkan Andersson; Umeå universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Group-referenced marks; norm-referenced marks; criterion-referenced marks; marks; grades; grading; selection; employment qualifications; merits; Relativa betyg; grupprelaterade betyg; normrelaterade betyg; målrelaterade betyg; kriterierelaterade betyg; betyg; urval; anställningsmeriter; meriter;

    Sammanfattning : Denna avhandling, som i huvudsak är resultatet av ett projekt finansierat av Skolöverstyrelsen, består av fem delstudier (I-V) utförda under åren 1977-1991 samt en sammanfattande analysdel (VI). Avhandlingens syfte är att studera det unika svenska relativa betygssystemet, som infördes på försök i folkskolan i början av 1940-talet för att senare permanentas och även införas i enhets- och grundskolan samt slutligen även i gymnasiet. LÄS MER

  3. 2. Human aspects on the evacuation of a passenger ship - passengers' and crew's capabilities and limitations to cope with a dangerous and demanding situation

    Författare :Monica Andersson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; stress; passenger groups; reactions; passenger ships; group reactions; evacuation;

    Sammanfattning : Todays evacuation systems and equipment are not adapted to realistic circumstances. The equipment is complicated, difficult and dangerous to handle. The equipment is furthermore tested and approved in limited weather conditions which make it more or less impossible to launch the equipment, if the weather conditions are too bad. LÄS MER

  4. 3. Atom and Group Transfer Reactions Involving High-valent Iron Complexes

    Författare :Yong Li; Kemisk fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Iron enzymes; high-valent iron intermediates; bio-inspired iron complexes; FeIV=O; FeIV=NR; catalytic reactions; electronic effects; steric restriction.;

    Sammanfattning : Iron enzymes play critical roles in biological oxidation reactions by utilizing highly reactive high-valent iron intermediates, such as FeIV=O, FeV(O)(OH), and FeIV=NR species, for catalytic reactions. These intermediates exhibit remarkable catalytic behavior with high reactivities and high regio- and stereospecificity in various biochemical reactions. LÄS MER

  5. 4. Palladium(II)-Catalyzed Addition Reactions : Synthesis of Aryl Amidines and Aryl Ketones

    Författare :Jonas Rydfjord; Mats Larhed; Adriaan Minnaard; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palladium; Catalysis; Palladium II catalysis; Synthesis; Addition Reactions; Cyanamide; Amidine; Aryl Amidine; Nitrile; Ketone; Aryl Ketone; Carbopalladation; Continuous-flow; Continuous flow; Microwave heating; Farmaceutisk vetenskap; Pharmaceutical Science;

    Sammanfattning : Palladium-catalyzed reactions have become one of the most important tools in modern organic chemistry due to its ability to catalyze the formation of new carbon-carbon bonds.The aim of the work presented in this thesis was to develop new palladium(II)-catalyzed addition reactions. LÄS MER

  7. 5. Surface reactions on metallic nanoparticles : Ligand adsorption, metal release, and reactive oxygen species generation

    Författare :Amanda Kessler; Inger Odnevall; Tommy Nylander; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; metallic nanoparticles; ROS; reactive oxygen species; metal release; ligand adsorption; corrosion; Fenton like Haber Weiss reactions; metalliska nanopartiklar; ROS; reaktiva syreradikaler; metallfrisättning; adsorption; korrosion; Fenton lika Haber Weiss reaktioner; Kemi; Chemistry;

    Sammanfattning : Humans are exposed daily to metallic nanoparticles (Me NPs) from multiple sources which can have both natural and anthropogenic origins. Such exposures take place via different routes including inhalation and skin contact and may result in adverse health effects. LÄS MER