Sökning: "slope"

Visar resultat 1 - 5 av 307 avhandlingar innehållade ordet slope.

1. 1. When mathematics teachers focus discussions on slope : Swedish upper secondary teachers in a professional development initiative

   Författare :Anna Bengtsson; Constanta Olteanu; Kirsti Hemmi; Linnéuniversitetet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; teacher professional development; upper secondary mathematics teachers; collegiality; slope; rate of change; teaching culture; community of practice; learning study; Mathematical Education; Matematikdidaktik;

   Sammanfattning : The shift towards collegiality is a new setting for many teachers. Most teachers work alone, in isolation from their colleagues and collegial collaboration requires organisational structures. LÄS MER

3. 2. On modelling of slope stability in sensitive clay

   Författare :Carolina Sellin; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; constitutive modelling; mobilisation of shear strength; destructuration; slope stability; anisotropy; sensitive clay; rate dependence;

   Sammanfattning : The stability of natural slopes is a global problem, with the number of landslides and the associated socioeconomic losses increasing, as a result of the global trend of urbanisation, deforestation and changed weather patterns. The available methods for identifying potential failure modes and assessing the stability, however, overly simplify the modelled soil behaviour within a slope, which might lead to unnecessary mitigation measures or non-conservative results. LÄS MER

4. 3. A GIS-based landscape analysis of dissolved organic carbon in boreal headwater streams

   Författare :Jan-Olov Andersson; Lars Nyberg; Hjalmar Laudon; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; boreal forests; wetlands; vegetation types; headwater streams; catchment hydrology; streamwater chemistry; DOC; GIS; terrain analysis; DEM; slope; wetness index; TWI; Freshwater ecology; Limnisk ekologi; Biology; Biologi;

   Sammanfattning : In boreal catchments, stream water chemistry is influenced and controlled by several landscape factors. The influence of spatially distributed variables is in turn dependent on the hydrological scale. LÄS MER

5. 4. Rate as the relation of changes in two quantities : A variation theory perspective of learning rate of change

   Författare :Per Håkansson; Robert Gunnarsson; Ulla Runesson Kempe; Jönköping University; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; rate of change; slope; covariation; functions; mathematics teaching and learning; variation theory; learning study; förändringstakt; lutning; samvariation; funktioner; matematiklärande; variationsteori; learning study;

   Sammanfattning : This thesis comprises three original papers about learning rate of change in school mathematics. The overall aim of the thesis is to contribute with knowledge in this particular area of research. Within this aim, each of the original papers contribute with its own perspective. LÄS MER

7. 5. Undrained shear strength in clay slopes - Influence of stress conditions. A model and field test study

   Författare :Hjördis Löfroth; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; preconsolidation pressure; piezocone test; slope; model test; consolidation; horizontal stress; clay; undrained shear strength; direct simple shear test; field vane test; field test;

   Sammanfattning : To counteract natural hazards such as landslides, current methods for evaluation of soil properties as a mean for determining the safety level of natural slopes need to be refined. The empirical relationships used for estimation of the undrained shear strength from piezocone and field vane test are based on the stress conditions valid for horizontal ground and normally consolidated or slightly overconsolidated soil. LÄS MER