Search for dissertations about: "A Herrera"

Showing result 1 - 5 of 19 swedish dissertations containing the words A Herrera.

  1. 1. A QUEST FOR ENVIRONMENTAL SOVEREIGNTY : Chicana/o Literary Experiences of Water (Mis)Management and Environmental Degradation in the US Southwest

    Author : María Isabel Perez-Ramos; Sverker Sörlin; Marco Armiero; Joni Adamson; Maria Herrera Sobek; KTH; []
    Keywords : HUMANITIES; HUMANIORA; HUMANIORA; HUMANITIES; Environmental humanities; ecocriticism; environmental history; comparative literature; U.S. Southwest; Chicana o; subaltern literature; environmental justice; water; political ecology; postcoloniality; decoloniality.; Miljöhumaniora; ekokritik; miljöhistoria; litteraturhistoria; sydvästra USA; Chicana o; subaltern litteratur; miljörättvisa; vatten; politisk ekologi; postkolonialitet; dekolonialitet.; Historiska studier av teknik; vetenskap och miljö; History of Science; Technology and Environment;

    Abstract : The U.S. Southwest is a semi-arid region affected by numerous environmental problems. Chicana/o communities have been directly affected by such problems, especially ever since the region was annexed from Mexico by the United States in the mid-nineteenth century. READ MORE

  2. 2. Preparation and characterization of nanocellulose films and coatings from industrial bio-residues

    Author : Martha Herrera; Luleå tekniska universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : The aim of this work has been to study cellulose nanocrystals (CNC) from bio-residues and their use as green coating materials. In the first part of this work, physical and chemical properties of different types of cellulose nanocrystals, from different raw material sources and different treatments were compared. READ MORE

  3. 3. Processing and Properties of Nanostructured Biocomposites

    Author : Natalia Herrera Vargas; Luleå tekniska universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : In this work, nanostructured biocomposite fibers and films with cellulose nanofibers (CNF), cellulose nanocrystals (CNC) and chitin nanocrystals (ChNC) were prepared using solutions mixing followed by electrospinning and melt compounding. The main processing challenges for these materials were to find parameters for: 1) fiber alignment in electrospinning, 2) feeding the nanomaterials into the extruder and 3) dispersion and distribution of the nanomaterials in the polymeric matrix. READ MORE

  4. 4. Processing and properties of nanocomposites based on polylactic acid, chitin and cellulose

    Author : Natalia Herrera Vargas; Kristiina Oksman; Aji P. Mathew; Jyrki Vuorinen; Luleå tekniska universitet; []
    Keywords : ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Nanocomposite; Cellulose; Chitin; Extrusion; Polylactic acid; Trä och bionanokompositer; Wood and Bionanocomposites;

    Abstract : The production of bio-based and biodegradable nanocomposites has gained attention during recent years for environmental reasons; however, the large-scale production of these nanocomposites still poses challenges. The objective of this work has been to prepare bio-based and biodegradable nanocomposites via liquid-assisted extrusion and to gain a deeper understanding of the process and the relationship between the process, composition, structure and properties. READ MORE

  5. 5. Environmental influence on alpha-helical peptides

    Author : Ana Caballero Herrera; Karolinska Institutet; Karolinska Institutet; []
    Keywords : MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MD alpha helix; C-peptide; membrane proteins; hydrogen bonds; packing; dynamics;

    Abstract : Most proteins at physiological conditions fold into a native functional three-dimensional conformation. The stability of the Native state is a balance between different interactions within the protein and with the solvent. READ MORE