Sökning: "löfgren"

Visar resultat 1 - 5 av 144 avhandlingar innehållade ordet löfgren.

  1. 1. Linear and Nonlinear Transport in Quantum Nanostructures

    Författare :Anneli Löfgren; Fasta tillståndets fysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; magnetoconductance; mesoscopic; electron billiard; quantum dot; quantum ratchets; non-linear; symmetries; non-symmetric conduction; rectification; artificial material; Halvledarfysik; Fysicumarkivet A:2002:Löfgren; ballistic transport; quantum transport; 2DEG; Semiconductory physics; InP InGaAs; GaAs AlGaAs;

    Sammanfattning : In this thesis, electron transport in mesoscopic semiconductor nanostructures, in particular so-called electron billiards or quantum dots, is studied. The thesis can be divided into two areas: the linear response regime of transport, and the nonlinear response regime of transport. LÄS MER

  3. 2. Developing integrated downstream processes for next-generation biologics

    Författare :Anton Löfgren; Avdelningen för kemiteknik; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Downstream processing; Preparative chromatography; Optimization; Integration;

    Sammanfattning : Manufacturing of biopharmaceuticals is a costly and time consuming process due to its inherent complexity and variability. The downstream process is the most expensive part and it involves multiple non-trivial steps. Continuous integrated manufacturing is a new concept that is encouraged by authorities. LÄS MER

  4. 3. International network competitiveness : Technical and foreign market knowledge development in international SME networks

    Författare :Angelika Löfgren; James Sallies; Handelshögskolan i Stockholm; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; International competiveness; SME; International entrepreneurship; Business networks; Innovation; Co-innovation; Internationalization; International entrepreneurship; Network management; Network coordination; Knowledge management; Knowledge development; Business studies; Företagsekonomi;

    Sammanfattning : How can small and medium-sized enterprises (SMEs) compete over time within international networks? This thesis takes a stance in that business network relationships are essential for international SMEs as such networks can provide knowledge and learning opportunities. International network competitiveness is, in this thesis, introduced as a concept that captures SMEs long term performance, resulting from the firms being competitive within international business networks. LÄS MER

  5. 4. Physicians sickness certification practices : frequency, problems, and learning

    Författare :Anna Löfgren; Karolinska Institutet; Karolinska Institutet; []
    Nyckelord :Sick leave; sickness certification; insurance medicine; physician; family practice; competence; learning; health care;

    Sammanfattning : Background: Administration of sickness absence involves many stakeholders, among them physicians, who play a key role in the sickness insurance systems in most western countries. Despite the impact that sickness absence can have on the life situation of the affected individual, physicians have limited training in how to handle sickness certification cases, and very little research has examined the practices of those medical professionals in this context. LÄS MER

  7. 5. Stability of the free-surface problem arising in ice-sheet- and glacier modeling : Numerical investigation and stabilization

    Författare :André Löfgren; Josefin Ahlkrona; Fabien Gillet-Chaulet; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Ice-sheet modeling; glacier modeling; ice-sheet dynamics; free-surface flow; stability; stabilization; free-surface stabilization algorithm; Numerical Analysis; numerisk analys;

    Sammanfattning : This thesis consists of two papers dealing with a stabilization method for free-surface flows. The method was initially developed to stabilize mantle-convection simulations, but is in this work extended to ice-sheet- and glacier modeling. LÄS MER