Sökning: "Surrogate"

Visar resultat 21 - 25 av 229 avhandlingar innehållade ordet Surrogate.

1. 21. Vehicle wakes subject to side wind conditions

   Författare :Magnus Urquhart; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; drag; surrogate model; cavity; Latin Hypercube Sampling; wake; aerodynamics; real world conditions; Proper Orthogonal Decomposition; wind averaged drag; Radial Basis Functions; side wind; optimization; tapered extensions; cycle averaged;

   Sammanfattning : Passenger vehicles are associated with travel flexibility, today it is clear that this flexibility impacts the environment. Passenger vehicles account for more than one-tenth of all greenhouse gasses in Europe with approximately a quarter of the vehicle's energy consumption wasted as aerodynamic drag. LÄS MER

3. 22. Optimization of truck tyres selection

   Författare :Zuzana Nedelkova; Göteborgs universitet; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; radial basis function; categorical variables; truck tyres; simulation-based optimization; surrogate model; approximately optimal solution; efficient solution; rolling resistance coefficient; vehicle dynamics; simulation-based optimization;

   Sammanfattning : This thesis, which consists of an introduction and five appended papers, concerns the optimal selection of tyres for a variety of vehicle configurations as well as operating environments. The selection problem stems from a project cooperation between Chalmers University of Technology and Volvo Group Trucks Technology. LÄS MER

4. 23. CFD-based Analysis of Combustion Processes in a Free-Piston Diesel Engine

   Författare :Miriam Bergman; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; chemical kinetics; Diesel; homogeneous charge compression ignition HCCI ; free-piston; equivalence ratio vs. temperature maps; computational fluid dynamics CFD ; surrogate fuel;

   Sammanfattning : The Free Piston Engine (FPE) which is capable of operating in a variable compression ratio mode, allows flexible auto-ignition control on a cycle-to-cycle basis without any hardware modifications. In this study combustion processes in an FPE were examined using the KIVA-3V CFD code with detailed chemical kinetics (305 reactions among 70 species) of a Diesel surrogate fuel incorporated. LÄS MER

5. 24. Studies in Swedish Sign Language : Reference, Real Space Blending, and Interpretation

   Författare :Anna-Lena Nilsson; Brita Bergman; Terry Janzen; Stockholms universitet; []
   Nyckelord :HUMANIORA; HUMANITIES; Swedish Sign Language; INDEX-c; first person pronoun; non-dominant hand; buoys; Real Space blending; token blend; surrogate blend; signing space; constructed dialogue; constructed action; sign language interpreting; Sign language; Teckenspråk; Sign Language; teckenspråk;

   Sammanfattning : This thesis comprises four separate studies of the same material: a ten-minute Swedish Sign Language monologue. Study I describes the form, meaning, and use of the sign INDEX-c, a pointing toward the chest traditionally described as a first person pronoun. LÄS MER

7. 25. Biological diversity values in semi-natural grasslands : indicators, landscape context and restoration

   Författare :Mathias Öster; Ove Eriksson; Martin Zobel; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Biodiversity; connectivity; Hygrocybe; indicators; landscape history; plants; pollen limitation; species-area effects; surrogate species; Biology; Biologi;

   Sammanfattning : Semi-natural grasslands, which are a declining and fragmented habitat in Europe, contain a high biodiversity, and are therefore of interest to conservation. This thesis examines how plant diversity is influenced by the landscape context, and how plant and fungal diversity can be targeted by practical conservation using indicator species and congruence between species groups. LÄS MER