Sökning: "Richness Threshold"

Visar resultat 1 - 5 av 7 avhandlingar innehållade orden Richness Threshold.

1. 1. Multiport Antenna Systems for Space-Time Wireless Communications

   Författare :Nima Jamaly; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Spatial Correlation; Multiport Matching Efficiency; Multiport Antennas; Uncorrelated Multipath.; Richness Threshold; Multiport Effective Length; Pattern Overlap Matrix; Multiport Effective Area; Non-rich Multipath; Covariance Matrix; Predictor Antenna System; Correlated Multipath;

   Sammanfattning : Multiport antenna systems are indispensable part of modern wireless communication systems. Their crucial impact on the overall performance requires sufficient regard and dedication to a precise design and characterisation. This concern has been to a considerable extent addressed in the frame of the current thesis. LÄS MER

3. 2. Plant species diversity patterns in a Swedish rural landscape : effects of the past and consequences for the future

   Författare :Sara A. O. Cousins; Roy Haines-Young; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Plant species richness in rural landscapes is threatened as grassland management ceases or changes, and as many remaining semi-natural grasslands are becoming increasingly fragmented. This thesis is a study of plant species diversity in a rural landscape in south-eastern Sweden, and its relationship to management history and landscape pattern. LÄS MER

4. 3. The Use of Press Archives in the Temporal and Spatial Analysis of Rainfall-Induced Landslides in Tegucigalpa, Honduras, 1980-2005

   Författare :Elias Garcia-Urquia; Kristofer Gamstedt; José Cepeda; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; press archives; landslide database; urban landslides; critical rainfall intensity; antecedent rainfall; rainfall frequency contour lines; matrix method; landslide susceptibility index; Tegucigalpa; Honduras; Hurricane Mitch; Geovetenskap med inriktning mot miljöanalys; Earth Science with specialization in Environmental Analysis;

   Sammanfattning : The scarcity of data poses a challenging obstacle for the study of natural disasters, especially in developing countries where the social vulnerability plays as important a role as the physical vulnerability.  The work presented in this thesis is oriented towards the demonstration of the usefulness of press archives as a data source for the temporal and spatial analysis of landslides in Tegucigalpa, Honduras for the period between 1980 and 2005. LÄS MER

5. 4. Aspects of locomotor evolution in the Carnivora (Mammalia)

   Författare :Ki Andersson; Lars E. Holmer; Lars Werdelin; Margaret E. Lewis; Uppsala universitet; []
   Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Morphology; Mammalia; Carnivora; Locomotion; Cranial; Elbow joint; Morphology; Morphometrics; Landmarks; Multivariate statistics; Allometry; Ecomorphology; Dental; Body size; Morfologi; Morphology; cell biology; pathology; Morfologi; cellbiologi; patologi;

   Sammanfattning : In this thesis, the shape of the distal humerus trochlea is analysed using landmark-based morphometrics and multivariate methods, with the aim of exploring locomotor evolution in carnivorans. Elbow joint morphology is used together with body size and craniodental morphology to characterize past and present carnivorans. LÄS MER

7. 5. Essays on Social Interactions and the Long-term Effects of Early-Life Conditions

   Författare :Peter Nilsson; Per Johansson; Patrik Hesselius; Janet Currie; Uppsala universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Early-life conditions; social interactions; Economics; Nationalekonomi; nationalekonomi; Economics;

   Sammanfattning : This thesis consists of four self-contained essays. Essay 1: From the late 1970s through mid 1990s blood-lead levels decreased drastically in Swedish children due to the sharp phase-out of leaded gasoline. LÄS MER