Sökning: "chemical bonding"

Visar resultat 1 - 5 av 269 avhandlingar innehållade orden chemical bonding.

  1. 1. Protein-based packaging films, sheets and composites : process development and functional properties

    Författare :Sung-Woo Cho; Mikael Hedenqvist; Amar K. Mohanty; Högskolan i Borås; []
    Nyckelord :ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wheat gluten; solution casting; compression molding; extrusion; injection molding; aging; migration; opacity; heat sealability; hemp fiber; laminate; polylactic acid; clay; nanocomposites; Energi och material; nanocomposites.; Other chemical engineering; Övrig kemiteknik;

    Sammanfattning : The depletion of the petroleum resources and a number of environmental concerns led to considerable research efforts in the field of biodegradable materials over the last few decades. Of the diverse range of biopolymers, wheat gluten (WG) stands out as an alternative to synthetic plastics in packaging applications due to its attractive combination of flexibility and strength, high gas barrier properties under low humidity conditions and renewability. LÄS MER

  3. 2. Models of chemical bonding : Representations Used in School Textbooks and by Teachers and their Relation to Students´Difficulties in Understanding

    Författare :Anna Bergqvist; Michal Drechsler; Shu-Nu Chang Rundgren; Pernilla Nilsson; Karlstads universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; pedagogical content knowledge; chemical bonding; textbook analysis; students learning difficulties; models in science education; Kemi; Chemistry;

    Sammanfattning : This thesis focuses on how school textbooks and teachers present models of chemical bonding in upper secondary schools in Sweden. In science, as well as in science education, models play a central role, but research has shown that they often are difficult for students to understand. LÄS MER

  4. 3. Computational Studies of Chemical Interactions: Molecules, Surfaces and Copper Corrosion

    Författare :Joakim Halldin Stenlid; Tore Brinck; Thomas Bligaard; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; computational chemistry; density functional theory; chemical interactions; reactivity descriptors; copper corrosion; surface and materials science; nucleophilic substitution reactions; heterogeneous catalysis; transition metal oxides; nanotechnology; beräkningskemi; täthetsfunktionalteori; kemiska interaktioner; reaktivitetsdeskriptorer; kopparkorrosion; yt- och materialvetenskap; nukleofila substitutionsreaktioner; heterogen katalys; överångsmetalloxider; nanoteknologi; Kemi; Chemistry;

    Sammanfattning : The chemical bond – a corner stone in science and a prerequisite for life – is the focus of this thesis. Fundamental and applied aspects of chemical bonding are covered including the development of new computational methods for the characterization and rationalization of chemical interactions. LÄS MER

  5. 4. Teaching and learning of chemical bonding models : Aspects of textbooks, students’ understanding and teachers’ professional knowledge

    Författare :Anna Bergqvist; Shu-Nu Chang Rundgren; Pernilla Nilsson; Ingo Eilks; Karlstads universitet; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Chemical bonding models; Pedagogical content knowledge; Teachers professional development; Chemistry education; Students learning; Kemi; Chemistry;

    Sammanfattning : Despite the growing importance of science and technology in society, school students consider these subjects irrelevant and hard to learn. Teachers must therefore know how to teach science in ways that enhance students’ understanding and interest. LÄS MER

  7. 5. Design, Synthesis and Thermodynamic Studies of Galectin Ligands

    Författare :Maria Luisa Verteramo; Centrum för analys och syntes; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; TEKNIK OCH TEKNOLOGIER; NATURAL SCIENCES; ENGINEERING AND TECHNOLOGY; galectin; conformational entropy; solvation; thermodynamic; interaction; molecular recognition; thiodigalactoside; diastereomer; structure-based design;

    Sammanfattning : The signaling within and between cells in biology is governed by molecular recognition between natural or synthetic ligands and proteins. This thesis project aimed to investigate the thermodynamic properties of specific interaction between synthetic ligands and galectin proteins. LÄS MER