Sökresultat

The structure and motion problem of multiple one- dimensional projections of a two-dimensional environment is studied. One-dimensional cameras have proven useful in several different applications, most prominently for autonomous guided vehicles, but also in ordinary vision for analysing planar motion and the projection of lines. Previous results on one-dimensional vision are limited to classifying

The frequently used subincremental method has so far been based on a linear interpolation of the total strain path within each main step. This method has proven successful when elastic–plastic behaviour and secondary creep is involved. The present paper proposes a nonlinear subincremental method applicable to general elastic–plastic–creep behaviour including problems with a highly nonlinear total

Energy simulation programs are commonly used to calculate the climate and energy requirements in glazed spaces and adjacent buildings. However, these programs have usually been developed to study buildings with ordinary window sizes. Comparisons of four simulation programs were carried out for a sunspace with an adjacent room. The distribution of solar radiation between the glazed space and the ad

A formula is proposed for the longshore sediment transport in the swash based on the study by Larson et al. on swash-zone transport and foreshore evolution. Hydrodynamics needed to predict the local transport rate were derived from ballistics theory, where both the cases with and without friction were investigated. The formula was validated with data from two experiments carried out in the Large-s

A major issue related to our modern way of life is the noise caused by jet engine powered airliners. Methods to reduce the jet noise were proposed in the last decades starting with the introduction of high bypass turbofan engines. A numerical investigation of flow and acoustics of a separate flow exhaust system is performed in the present paper. The goal is to investigate how the noise generated b

The objective of the present study was to develop a set of pictures with different emotional facial expressions to be used in empirical studies. The photographs included in the database were chosen from six face databases on the basis of empirical studies in which 1) a large student sample judged the pictures on emotional category, expressiveness and quality of the photograph and 2) trained expert

Different phenomena such as complex flow field and heat release by combustion are involved in the heat transfer process in combustion chambers. This paper concerns prediction of heat load and wail temperature in a gas turbine combustor by taking different phenomena into account. Two dimensional axi-symmetric models were used to model the flow field and combustion in a premised combustor with two d

Abstract not available

Popular Abstract in Swedish Växande krav på transporters kvalitet och kvantitet ger höga förväntningar på vägarnas kvalitet. Därför har omfattande resurser ägnats åt vägbyggnad och särskilt förbättring av befintliga vägar för att bemöta krav på säkerhet, komfort och bärighet. Ett välfungerande vägnät är en viktig komponent i den ekonomi- och samhällsutvecklingsprocess som förbrukar en stor del av The main objective of this thesis is to study the response and development of permanent deformation in unbound granular materials, theoretically and experimentally. A testing box technique is used here to more closely simulate the behaviour of unbound aggregates subjected to external vertical loading. A small box device (800×800×800 mm) is employed to test both the response and permanent deforma

2023-03-16 Protokoll JoL-kommitten Sida 1 av 6 Kommittén för jämställdhet och lika villkor PROTOKOLL Diarienummer V 2023/702 Datum 2023-03-16 JoL-kommittén 2023-03-16 Närvarande ledamöter Sven Lidin, ordförande Else Lytken, fysiska institutionen Ola Wendt, kemiska institutionen Ricardo Guillén, INES Elsa von Corswant, LUNA Gertrud Wrange, LUNA Mats Rundgren, geologiska institutionen Yann Clough, C

https://www.naturvetenskap.lu.se/internt/sites/naturvetenskap.lu.se.internt/files/2023-12/2023-03-16-protokoll-JoL-kommitten-webb.pdf - 2026-05-11

Till följd av den pågående energikrisen har vi under 2022 upplevt skenande elpriser och hot om bortkoppling av kunder från elnätet. Nya lösningar som säkerställer tillgång på el och balans i elnätet är nödvändiga. En lösning som visar stor potential är lagring av energi i vätgas. En av utmaningarna som Sveriges elnät står inför, och som det pratats mycket om den senaste tiden, är effektbrist. EffWith climate change as the main driving force, the energy system is currently undergoing changes. Both the share of renewable resources used to produce electricity and the overall electrification is increasing. A way to handle the resulting challenges from more intermittent electricity production is by the implementation hydrogen technology. Hydrogen technology can help balance the electricity net

Name 1 MDC Bodycomp 2022-08-18 Contents: Measures of body composition. Anthropometric measurements were taken by a trained nurse. Bioelectrical impedance analysis (BIA 103, RLJ system) was used for measuring the resistance and reactance. Measured values of these two variables were used together with the participant's sex, age, height and weight in regression analysis and formulas to calculate the

https://www.malmo-kohorter.lu.se/sites/malmo-kohorter.lu.se/files/2023-11/MDC%20Bodycomp.pdf - 2026-05-11

This Master thesis work was performed in Ericsson AB, Lund. It studies and validates two classes of algorithms to be used in mm-wave massive MIMO antenna arrays, for their use in the future 5G mobile communication systems. The first class of algorithms relates to the calibration of the transceiver (TRX) chains responses of the antenna array and makes use of the antenna array mutual coupling, which

As interest in social vulnerability to hazards grows, more indices are formulated for identifying and mapping population groups that may experience differential consequences from natural hazards. However, less attention has been given to the underlying choices researchers make when creating these indices. With the aim to contribute to understanding the issues surrounding social vulnerability indic