Sökning: "relative efficiency"

Visar resultat 21 - 25 av 308 uppsatser innehållade orden relative efficiency.

1. 21. Active flow control of the turbulent boundary layer over a NACA4412 wing profile for skin friction drag reduction

   Master-uppsats, KTH/Teknisk mekanik

   Författare :Giacomo Semprini Cesari; [2023]
   Nyckelord :Active flow control; drag reduction; numerical simulations; turbulent boundary layer; wings;

   Sammanfattning : In the context of building a framework for active flow control of turbulent boundary layers in wings, a set of large-eddy simulation (LES) are implemented in OpenFOAM. The flow around a NACA4412 wing profile is simulated at 5° angle of attack and Re_c = 400˙000. LÄS MER

3. 22. The Future of Warehouse Automation: Will Drones Ever Take Off?

   Master-uppsats, Lunds universitet/Teknisk logistik

   Författare :Filip Axén; Idun Jerlhagen Forsgren; [2023]
   Nyckelord :Autonomous drones; UAV; Warehousing; Technology adoption; Delphi study; Technology and Engineering;

   Sammanfattning : Background: In recent years, manually controlled drones have taken off on the commercial market, as well as in the agricultural industry and in humanitarian logistics. This has increased the interest in investing in autonomously controlled drones to increase efficiency and reduce costs. LÄS MER

4. 23. A comparison of remote sensed semi-arid grassland vegetation anomalies detected using MODIS and Sentinel-3, with anomalies in ground-based eddy covariance flux measurements.

   Master-uppsats, Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

   Författare :Jason Craig Joubert; [2023]
   Nyckelord :Geography; GIS; Anomaly Detection; Remote Sensing; fAPAR; GDMP; GPP; MODIS; Sentinel-3; Earth and Environmental Sciences;

   Sammanfattning : Remote sensed vegetation biophysical indicators are derived from various sensors and methods and contribute to the quantification of vegetation growth. They are used as inputs to early warning systems for crop yield estimation, thus improving crop management and food security. LÄS MER

5. 24. When is Electric Freight Cost Competitive? : Computational modeling and simulation of total cost of ownership for electric truck fleets

   Uppsats för yrkesexamina på avancerad nivå, Linköpings universitet/Institutionen för ekonomisk och industriell utveckling

   Författare :Anton Zackrisson; [2023]
   Nyckelord :electric freight; battery-electric trucks; total cost of ownership; decision making under deep uncertainty DMDU ; cost-competitiveness; exploratory modeling and analysis EMA ; EMA workbench; quasi-Monte Carlo method; VRP; EVRP; elektrifiering; godstransport; elektriska lastbilar; total ägandekostnad; kostnadskonkurrenskraft; ruttoptimering;

   Sammanfattning : Battery electric trucks (BETs) offer environmental benefits in terms of reduced carbon emissions and enhanced energy efficiency but have been challenged with economic viability compared to conventional internal combustion engine trucks (ICETs) caused by substantial acquisition costs, limited charging infrastructure, and concerns regarding range and payload capacity.  Previous studies focus on TCO at the vehicle or policy level but overlook the system and firm-level impacts. LÄS MER

7. 25. Embedment Behavior of Steel Dowel in Timber Loaded Perpendicular to the Grain : Influence of Assembly History in Combination with Moisture Change and Cyclic Loading

   Master-uppsats, Linnéuniversitetet/Institutionen för byggteknik (BY)

   Författare :Mojtaba Khalili; [2023]
   Nyckelord :Embedment strength; elastic and plastic embedment stiffness; moisture content; swelling and shrinkage; steel dowel; assembly history; cyclic loading;

   Sammanfattning : The embedment behavior of dowels in timber structures, as an essential parameter in the design of connections, is the subject of this thesis. There are numerous advantages using timber structures, including sustainability, energy efficiency, and aesthetic appeal. LÄS MER