Sökning: "Stefan Stefan Lutz"

Hittade 5 avhandlingar innehållade orden Stefan Stefan Lutz.

1. 1. Lipase and ω-Transaminase : Biocatalytic Investigations

   Författare :Maria Svedendahl; Per Berglund; Stefan Stefan Lutz; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Candida antarctica lipase B; enzyme catalysis; enzyme catalytic promiscuity; molecular modeling; ω-transaminase; Biochemistry; Biokemi;

   Sammanfattning : In a lipase investigation, Candida antarctica lipase B (CALB) are explored for enzyme catalytic promiscuity. Enzyme catalytic promiscuity is shown by enzymes catalyzing alternative catalytic transformations proceeding via different transition state structures than normal. LÄS MER

3. 2. Oxidation of 1,2-Diols Using Alcohol Dehydrogenases : From Kinetic Characterization to Directed Evolution

   Författare :Cecilia Blikstad; Mikael Widersten; Stefan Lutz; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; enzyme kinetics; alcohol dehydrogenase; directed evolution; enzyme engineering; diol; α-hydroxy aldehyde; Biokemi; Biochemistry;

   Sammanfattning : The use of enzymes as catalysts for chemical transformations has emerged as a “greener” alternative to traditional organic synthesis. An issue to solve though, is that enzymes are designed by nature to catalyze reactions in a living cell and therefore, in many cases, do not meet the requirements of a suitable biocatalyst. LÄS MER

4. 3. Numerical computations of wind turbine wakes and wake interaction

   Författare :Karl Nilsson; Dan Henningson; Stefan Ivanell; Thorsten Lutz; KTH; []
   Nyckelord :;

   Sammanfattning : When wind turbines are placed in farms, wake effects reduce the overall power production. Also, turbine loads are significantly increased since turbulence levels are high within the wake flow. LÄS MER

5. 4. Wind power wake modelling : Development and application of an actuator disc method for industrial utilization

   Författare :Nikolaos Simisiroglou; Stefan Ivanell; Thorsten Lutz; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Wind power; Offshore wind farm; Wakes; Actuator Disc Method ACD ; Computational Fluid Dynamics CFD ; Reynolds Average Navier–Stokes RANS ; WindSim; PHOENICS;

   Sammanfattning : As a wind turbine extracts energy from the wind it creates a region downstream where the wind velocity is decreased and the urbulence intensity is increased, this region is commonly called the wake region. Today’s wind farms include a large number of wind turbines position in tight layouts. LÄS MER

7. 5. Rapid sintering of ceramics by intense thermal radiation

   Författare :Duan Li; Zhijian Shen; Lutz-Michael Berger; Stockholms universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Sintering; sintering by intense thermal radiation; spark plasma sintering; heat transfer; mass transfer; scattering; coalescence; densification; grain growth; numerical simulation; porous ceramic; foaming; nanostructure; hierarchical heterogeneities; permeability; Materials Chemistry; materialkemi;

   Sammanfattning : Sintering is an important processing step for obtaining the necessary mechanical stability and rigidity of ceramic bulk materials. Both mass and heat transfer are essential in the sintering process. The importance of radiation heat transfer is significantly enhanced at high temperatures according to the well-known Stefan-Boltzmann’s law. LÄS MER