Sökning: "stress redistribution"
Visar resultat 1 - 5 av 15 uppsatser innehållade orden stress redistribution.
1. Rock Wedge Stability Assessment : A Comparative Analysis of Limit Equilibrium and Discrete Element Methods
Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för samhällsbyggnad och naturresurserSammanfattning : Rock wedge stability is a common concern in underground excavations. Since the wedge stability influences the support design, it is important to use a wedge stability analysis method that can capture factors like excavation geometry, joint parameters and properties, rock mass properties, rock cover, and stress field as accurately as possible. LÄS MER
2. Off-State Stress Effects in AlGaN/GaN HEMTs : Investigation of high-voltage off-state stress impact on performance of and its retention in hybrid-drain ohmic gate AlGaN/GaN HEMTs
Master-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)Sammanfattning : High electron mobility transistors (HEMTs) realized using AlxGa1-xN/GaN are relatively new technology which is prominent for high-speed and high-power applications. Some of the main problems with this technology were identified as dynamic RDSon, current collapse and threshold voltage instabilities due to the off-state stress. LÄS MER
3. Prototyping and manufacturing of air-controlled damper unit to improve cooling system operating efficiency for data centers
Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Institutionen för teknikvetenskap och matematikSammanfattning : More and more people are using the internet for data processing, transfer, and storage. With it comes a higher demand for computational power from data servers. Unsurprisingly, the data center industry is becoming an increasingly large industry that is important for people’s daily lives. LÄS MER
4. Optimization of support in rock pillars between two parallel tunnels
Master-uppsats, KTH/Jord- och bergmekanikSammanfattning : When two parallel tunnels are excavated under high to moderate horizontal in-situ stresses combined with minor deformations in the pillar between the tunnels, the in-situ stresses can be redistributed over the tunnels in form of two compressive arches and are transferred from the roof to the abutments of the two tunnels. At additional deformations in the pillar, a new redistribution of the stresses can occur creating one compressive arch over both of the tunnels. LÄS MER
5. Internal stability of geosynthetic reinforced soil walls : Calculations procedures for practical design
Master-uppsats, KTH/Jord- och bergmekanikSammanfattning : Reinforced soil constructions have a long history, and various types of the soil reinforcement havebeen in use since the medieval period. Geosynthetic reinforced soil walls (GRS-walls) while beingcommon throughout the world, in not included in the current Eurocode for geotechnical design, SSEN1997-1. LÄS MER
