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Visar resultat 1 - 5 av 166 avhandlingar som matchar ovanstående sökkriterier.

1. 1. Miljö i tanken? : Policyprocesser vid övergången till alternativa drivmedel i kollektivtrafiken i Linköping och Helsingborg 1976-2005

   Författare :Magdalena Fallde; Jenny Palm; Jane Summerton; Urban Strandberg; Linköpings universitet; []
   Nyckelord :Policy process; municipality; actor; policy entrepreneur; boundary walker; policy sectors; parallelism; public transport; alternative fuels; biogas; environment; Helsingborg; Linköping; Policyprocess; kommun; aktör; policyentreprenör; gränsgångare; policyområden; parallellitet; kollektivtrafik; alternativa drivmedel; biogas; miljö; Helsingborg; Linköping; SOCIAL SCIENCES; SAMHÄLLSVETENSKAP;

   Sammanfattning : Föreliggande avhandling studerar kommunala policyprocesser i en fråga där ett flertal olika policyområden ingår: övergången till alternativa drivmedel i kollektivtrafiken. Genom att undersöka hur och varför sådana policyer utvecklats i två kommuner bidrar studien dels till att förklara hur policy utvecklas på kommunal nivå; dels till att skapa förståelse för policyskapande där olika policyområden ingår. LÄS MER

3. 2. The Lagrangian Stochastic Advective-Reactive Approach to Modeling Solute Transport in Hydrological Systems

   Författare :Archana Gupta; KTH; []
   Nyckelord :solute transport; groundwater transport; unsaturated zone; stream hydrology; stream networks; stochastic processes; mass transfer kinetics; preferential flow; temporal moments; catchment hydrology; Lagrangian transport model;

   Sammanfattning : The Lagrangian stochastic advective-reactive modelingapproach has been used for analyzing transport of bothnonreactive and reactive solutes in different hydrologicalsystems (structured soil, groundwater, mining waste rockdeposits and surface waters including single stream and networkof streams) and at different spatio-temporal scales (rangingfrom laboratory column-scale to catchment-scale). Further, afirst step has been taken to extending the Lagrangianstochastic advective-reactive modeling methodology to integratethe soil-groundwater-stream transport through a catchment. LÄS MER

4. 3. Solute transport in the integrated soil-groundwater system

   Författare :Eva Simic; KTH; []
   Nyckelord :solute transport; groundwater transport; integrated soil.groundwater system;

   Sammanfattning : A Lagrangian stochastic travel time approach has been usedfor investigating dominant process impacts on (non-reactive andreactive) solute transport in the integrated soil-groundwatersystem. A first step has also been taken to extending thisLagrangian stochastic travel time approach to integrate thesoil-groundwater-stream transport through a catchment. LÄS MER

5. 4. Steering green buses : The opportunities and challenges of introducing renewable fuel in public transport

   Författare :Malin Aldenius; Miljö- och energisystem; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Public transport; Renewable fuel; Electric buses; Sustainable transport; Green public procurement; Environmental requirements;

   Sammanfattning : The aim of this thesis is to compare and analyse the introduction of renewable fuel in the public transport sector, focusing on the challenges and opportunities encountered by involved stakeholders on the regional and local levels. The results contribute to answering three research questions: 1) How do organisational factors and local and regional contextual factors influence the introduction of renewable fuel? 2) What are the challenges and opportunities of using green public procurement as a policy tool to introduce renewable fuel in the public transport sector? 3) How do the challenges and opportunities regarding the introduction of renewable fuel differ depending on the type of renewable fuel? Four papers are included in the thesis. LÄS MER

7. 5. The influence of multiscale hyporheic flow on solute transport : Implications for stream restoration enhancing nitrogen removal

   Författare :Ida Morén; Anders Wörman; Joakim Riml; Roy Haggerty; KTH; []
   Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; Hyporheic exchange flow; Hydrological modeling; Solute transport; Stream restoration; Nitrogen; Power spectral analysis; Hydraulic and Hydrologic Engineering; Hydraulik och teknisk hydrologi;

   Sammanfattning : Stream water that flows into and out of streambeds is called hyporheic exchange flow (HEF).It continuously interacts with groundwater and thereby affect the water quality of local streamreaches as well as downstream recipients by providing an environment where solutes andenergy can be retained and degraded. LÄS MER