Sökning: "high impact"
Visar resultat 1 - 5 av 3941 avhandlingar innehållade orden high impact.
1. Geochronology of impact structures - constraining syn- and post-impact processes using the 40Ar/39Ar and U-Pb techniques
Sammanfattning : The discovery, at the beginning of the 20th century, that elements can transform into other elements, due to the spontaneous decay of an instable to a stable atomic nuclei, gave rise to a powerful source for age information in many fields of earth science. For impact structures, it is crucial to establish well-defined and precise ages in order to understand how impact events affect the Earth’s geo and biosphere and also with regard to possible future events that can have devastating effects on our civilization. LÄS MER
2. Impact wave process modeling and optimization in high energy rate explosive welding
Sammanfattning : Impact waves are used in many different industries and are classified according to whether they cause plastic or elastic deformations. In the plastic deformation mode, these waves can be used to produce special electrical joints. In the elastic deformation mode, they can be used to detect leakage or to measure the thickness of pipes. LÄS MER
3. Damage Tolerance of Impacted Composite Sandwich Structures
Sammanfattning : This thesis deals with damage tolerance of impacted sandwich structures for load bearing applications. Composite sandwich structures find wide application as lightweight solutions in aerospace components, since weight reduction and less fuel emissions are primary concerns for aircraft manufactures. LÄS MER
4. Addressing poor educational outcomes among children with out-of-home care experience : Studies on impact, pathways, and interventions
Sammanfattning : Children with out-of-home care (OHC; foster family/residential care) experience is a high-risk group for future adverse outcomes. With an ambition of supporting the design of effective preventive child welfare measures targeting children in OHC, the overall aim of this thesis is to examine education as a possible intervention path for improving their development and overall life chances. LÄS MER
5. Assessing mathematical creativity : comparing national and teacher-made tests, explaining differences and examining impact
Sammanfattning : Students’ use of superficial reasoning seems to be a main reason for learning difficulties in mathematics. It is therefore important to investigate the reasons for this use and the components that may affect students’ mathematical reasoning development. LÄS MER