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A bioassay screening against protozoa parasites of several Tacana medicinal plants gave Hyptis brevipes (Id'ene eidhue), traditionally used as decoction for intestinal parasites, as the most active extract. In this work we did a bioguided isolation of active constituents found in leaves. Structure elucidation was carried out by NMR spectroscopy and MS spectrometry analyses. Active constituents sho
A laser diode structure realizing internal gain switching is suggested for high-power picosecond optical pulse generation. A thin wideband barrier layer is incorporated in the active region of this structure, in order to provide additional control of the carrier distribution and the gain dynamics. The dynamic laser output response to the nanosecond pumping current pulses is modeled and analyzed. T
The extent to which an individual’s (or a group’s) creative potential is expressed depends considerably on the environment in which that individual (or group) works. To understand scientific and technological creativity, one needs to analyze the interactions between individuals or groups and their environment. We put forward the concept of a creative knowledge environment (CKE) to examine the envi
This paper presents an investigation of rational agents that have limited computational resources and that can interact with their environments. We analyse how such agents can combine deductive reasoning using domain knowledge and inductive learning from past experiences, while remaining time-aware in a manner appropriate for beings situated in a dynamic universe. In particular, we consider how th
In cold climates, all user requirements for footwear (insulation, waterproofing, vapour permeability, drying, etc.) cannot be met easily due to their conflicting nature. Defining user conditions is important. Cold may be roughly divided into the three ranges (>+5; +5 to –10; <–10 °C). The choice of proper footwear may be based on this approach. It also reduces some of the conflicting user requirem
The description of the drug user and drug abuse varies and has changed over time. The aim of this study is to put a social constructionist approach to examine the social construction of drug abuse and drug users within selected parts of a specific Swedish public inquiry (SOU 2011:35). I have analyzed my material by dividing it into categories using a qualitative method for analyzing the content of
The aim of the thesis is to provide a solution for a new dome camera housing that fits Axis' P33 camera model so that it can be placed on ships. Extensive research is done into the maritime environment, corrosion, surface treatments and the state of Axis' current cameras. Detailed analysis is done regarding aluminum, stainless steel and plastics and their respective manufacturing methods.
The purpose of this study is to compare different schemes of anti-windup. The methods are compared for different processes and different disturbances; step response in setpoint, and load and measurement noise. The controller parameters are determined by the MIGO method and the reset time constant. The tests have been done by simulation in Matlab Simulink and the report is divided for PI and PID co
This paper uses a recently developed methodology to investigate the spatial and temporal diffusion patterns of a shock to the regional house markets in Sweden. We model the change in regional house prices such that they are allowed to be contemporaneously affected by price changes in the dominant region – Stockholm - as well as being allowed to be subject to a cointegrated relationship with its ne
Almost every large Swedish online newspaper has disabled comments under their articles due to problems with hateful and offensive comments. In this Master's thesis, we explore different ways to detect toxic comments using machine learning. We carry out a comparison of classification algorithms and evaluate a number of different feature sets with the goal of optimizing accuracy for the classifi
Abstract: During the last couple of decades the spread of wages has increased throughout the western world. Sweden is no exception from this trend, and the increased wage inequality in Sweden can be traced back 1980. This thesis aims to answer whether technology driven changes in demand for labor can explain changes in relative wage, and if increased foreign competition can explain increasing wage
