Sökning: "Johan Richter"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden Johan Richter.

  1. 1. Algebraic Properties of Ore Extensions and Their Commutative Subrings

    Författare :Johan Richter; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ore extension; Noncommutative algebra; Algebraic dependence;

    Sammanfattning : This thesis deals with a class of rings known as Ore extensions. An Ore extension can be described as a noncommutative ring of polynomials in one variable. A special focus of the thesis is the study of commuting elements in Ore extensions. LÄS MER

  3. 2. Fluorescence Guided Resection of Brain Tumors : Evaluation of a Hand-held Spectroscopic Probe

    Författare :Johan Richter; Karin Wårdell; Jan Hillman; Peter Siesjö; Linköpings universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : Malignant gliomas grow infiltrative in the brain and can therefore not be completely removed by neurosurgical means. However, for an optimized oncological treatment it has proven useful to resect as much as possible of tumor. The identification of the tumor in the marginal zone is difficult but crucial. LÄS MER

  4. 3. On Hom-associative Ore Extensions

    Författare :Per Bäck; Sergei Silvestrov; Johan Richter; Lars Hellström; Anatoliy Malyarenko; Joakim Arnlind; Mälardalens universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Mathematics Applied Mathematics; matematik tillämpad matematik;

    Sammanfattning : In this thesis, we introduce and study hom-associative Ore extensions. These are non-unital, non-associative, non-commutative polynomial rings in which the associativity condition is “twisted” by an additive group homomorphism. LÄS MER

  5. 4. Reordering in Noncommutative Algebras, Orthogonal Polynomials and Operators

    Författare :John Musonda; Sergei Silvestrov; Sten Kaijser; Johan Richter; Viktor Abramov; Mälardalens högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Mathematics Applied Mathematics; matematik tillämpad matematik;

    Sammanfattning : The main object studied in this thesis is the multi-parametric family of unital associative complex algebras generated by the element $Q$ and the finite or infinite set $\{S_j\}_{j\in J}$ of elements satisfying the commutation relations $S_jQ=\sigma_j(Q)S_j$, where $\sigma_j$ is a polynomial for all $j\in J$. A concrete representation is given by the operators $Q_x(f)(x)=xf(x)$ and $\alpha_{\sigma_j}(f)(x)=f(\sigma_j(x))$ acting on polynomials or other suitable functions. LÄS MER

  7. 5. Clinical and Experimental Studies in Chronic Myeloid Leukemia : Studies of Treatment Outcome, In Vitro Cellular Drug Resistance and Gene Expression

    Författare :Ulla Olsson-Strömberg; Bengt Simonsson; Elin Lindhagen; Gisela Barbany; Johan Richter; Uppsala universitet; []
    Nyckelord :Medicine; chronic myeloid leukemia; adult; stem cell transplantation; mobilization of Ph-negative stem cells; in vitro assay; imatinib; gene expression; Medicin;

    Sammanfattning : The aims of the studies described in the thesis were to investigate different treatment strategies in chronic myeloid leukemia (CML) patients. Furthermore, activity of imatinib was investigated by in vitro cytotoxicity assay, and the gene expression pattern in interferon treated patients. LÄS MER