Sökning: "irreversibility"

Visar resultat 1 - 5 av 17 avhandlingar innehållade ordet irreversibility.

1. 1. Computational homogenisation and solution strategies for phase-field fracture

   Författare :Ritukesh Bharali; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; irreversibility; multi-scale; slack variable; micromorphic; quasi-brittle; brittle; phase-field fracture; homogenisation;

   Sammanfattning : The computational modelling of fracture not only provides a deep insight into the underlying mechanisms that trigger a fracture but also offers information on the post-fracture behaviour (e.g., residual strength) of engineering materials and structures. LÄS MER

3. 2. Essays on Firm Turnover, Growth, and Investment Behavior in Ethiopian Manufacturing

   Författare :Mulu G Gebreeyesus; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; firm turnover; productivity; firm growth; investment; adjustment cost; irreversibility; manufacturing; Africa; Ethiopia.;

   Sammanfattning : This thesis analyses the dynamics and investment behavior of Ethiopian manufacturing firms in post-reform period using establishment level industrial census panel data from 1996 to 2003. Three related topics such as firm turnover and productivity differentials, determinants of firm growth, and the effect of adjustment cost and irreversibility on firm investment decisions are investigated empirically. LÄS MER

4. 3. Analysis of Mining Investments in Zimbabwe

   Författare :Ronald Chifamba; Göteborgs universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Investment; minerals; natural resource; uncertainty; irreversibility; cost function; consumption; return; investment; risk premia; user-cost; capital; Zimbabwe;

   Sammanfattning : The papers in this thesis investigate issues related to investment with particular reference to the mining sector in Zimbabwe. Issues analysed are the levels of risk premia that attract investment in minerals in developing countries, whether firms in the sector manage to reduce operation to optimal levels consistent with theoretical predictions, and the extent to which irreversibility has reduced investment expenditures. LÄS MER

5. 4. Numerical methods and multi-scale modeling for phase-field fracture - With applications in linear elastic and poro-elastic media

   Författare :Ritukesh Bharali; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; fracture; multiphysics; finite element; multiscale; desiccation; solvers; fracking; phase-field; solution techniques;

   Sammanfattning : This thesis presents novel numerical methods and a multi-scale modelling framework tailored for advancing the phase-field fracture model with applications in linear elastic and poro-elastic media. In the realm of the numerical methods, the focus lies on devising computationally efficient and robust monolithic solution techniques. LÄS MER

7. 5. Synthesis and properties of substituted Hg-based superconductors

   Författare :Dmitriy A. Pavlov; Ingrid Bryntse; Lauri Niinistö; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hg-based cuprate superconductors; synthesis and structure determination; LiF flux; oxyfluorides; irrevrsibility line; Inorganic chemistry; Oorganisk kemi;

   Sammanfattning : This thesis is focused on studies of substituted Hg-based superconducting copper oxides ((Hg1-xMx)Ba2Can-1CunO2n+2+δ). These compounds are promising objects of investigation, not only from a fundamental point of view but also because of their high values of superconducting transition temperature (Tc) and irreversibility field (Hirr). LÄS MER