Sökning: "passing zones"

Visar resultat 1 - 5 av 8 avhandlingar innehållade orden passing zones.

  1. 1. A methodology for operations-based safety appraisal of two-lane rural highways : Application in Uganda

    Författare :Godfrey Mwesige; Harilaos Koutsopoulos; Basil Psarianos; KTH; []
    Nyckelord :passing zones; passing rate; collision risk; accepted gap; time-to-collision; passing sight distance; two-lane rural highways; Uganda; Transportvetenskap; Transport Science;

    Sammanfattning : The majority of the road infrastructure in developing countries consists oftwo-lane highways with one lane in each travel direction. Operational efficiency of these highways is derived fromintermittent passing zones where fast vehicles are permitted by design to pass slow vehicles using the opposite traffic lane. LÄS MER

  3. 2. Essays on Educational Choices and Integration

    Författare :Elisabet Olme; David Seim; Jonas Vlachos; Robert McMillan; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; School Choice; School Segregation; Information; Refugees; Human Capital; Immigration; Language Training; Performance Bonuses; Economics; nationalekonomi;

    Sammanfattning : Are Parents Uninformed? The Impact of School Performance Information on School Choices and School Assignments. We study the impact of providing information about schools' performances on households' choice of school. LÄS MER

  4. 3. Development of a Methodology for Detecting Coolant Void in Lead-cooled Fast Reactors by Means of Neutron Measurements

    Författare :Peter Wolniewicz; Håkansson Ane; Christian Jammes; Uppsala universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LFR; fission chamber; nuclear; reactor; leak; criticality;

    Sammanfattning : In a lead-cooled fast reactor (LFR), small bubbles (in the order of one mm or less) may enter the coolant from a leaking steam generator. If such a leakage is undetected the small bubbles may eventually coalesce into a larger bubble in local stagnation zones under the active core. LÄS MER

  5. 4. Magnetic map sense in animals: effects of geographic and magnetic displacements

    Författare :Jannika Boström; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Oenanthe oenanthe; skylight polarization; geomagnetic map; geomagnetic field; endogenous migration programme; migratory fuelling; orientation; animal navigation;

    Sammanfattning : Migration research is a large and diverse field and in my thesis I have focused on the impact of geomagnetic cues on animal orientation, navigation and migratory fuelling. Several animal species from widely different taxa possess the ability to sense and make use of geomagnetic information during migratory or homing events. LÄS MER

  7. 5. Affective Borderscapes : Constructing, Enacting and Contesting Borders across the Southeastern Mediterranean

    Författare :Ioanna Wagner Tsoni; James W. Scott; Malmö universitet; []
    Nyckelord :Migration; Affect; Borders; Borderscapes; Mediterranean; Greece; Aegean Sea; Lesvos; Refugees;

    Sammanfattning : In the wake of a sociopolitically volatile era, which is increasingly characterized by the intensive and extensive proliferation of borders, the management of borders and migration are considered as predominantly rational and dispassionate processes. Their functions and filtering mechanisms, however, are increasingly underpinned by the instrumental top-down exertion of affective power and by the cultivation of emotional dispositions among political communities. LÄS MER