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The master thesis is a collaboration between Trelleborg AB and the division of Production and Materials Engineering at Lund University, Faculty of Engineering. The objective of the thesis has been to analyse the current production system from a lean perspective, identify an area in need of improvement and generate concrete solutions for how the studied area can be improved in terms of cost, perfor

Höganäs AB is developing an axial flux machine, where an even airgap between the stator and rotor is a vital parameter when designing a well functioning machine. It is believed that the stator is the component that introduces the biggest variations to the airgap, and that is why the stator is the object of investigation for this thesis. The stator is made of metal powder and the steps in the manuf

Colorless distributed combustion (CDC) is a promising novel technology to reduce emissions of carbon monoxide and nitrogen oxides in gas turbine combustors. CDC features a different flame regime than conventional gas turbine combustors, associated with a distributed reaction zone and low and uniform temperatures due to dilution of combustion air with exhaust gases. In this thesis, an attempt has b

Vid läkemedelsutveckling används proteiner vars funktion är beroende på hur det är veckat (dess konformation). Denna veckning påverkas i sin tur av vätebindningar från vatten, som bildar vätskemiljön i kroppen där medicinen ska verka och styrkan av vätebindningar påverkas i sin tur av vattenmolekylernas orientering kring proteinet. För att kunna förutse proteinets funktion i kroppen är det därför A protein’s function is directly related to its structure, which is in a water medium where it is affected by hydrogen bonds and the hydrophobic effect. These interactions are in turn dependent on the water molecules’ orientations around the protein. Therefore, it is vital to have correct orientations for the water molecules. Such information can be obtained by neutron crystallography. However, ev

The main aim with this master’s thesis was to study the possibilities of detecting an event (rat trap going off) by analyzing audio streams from a MEMS (micro-electromechanical systems) microphone or movement patterns from a MEMS accelerometer. To achieve this goal, a small, power efficient and cost efficient embedded system was built with the help of a development board, a MEMS accelerometer, a

Data har många användningsområden inom både forskning och industri. I detta examensarbete skapades en platform som självgående kan användas för att samla in stora mängder data från omgivningen.Everyone who has worked with research knows how rewarding experimenting and developing new algorithms can be. However in some cases, the hard part is not the invention of these algorithms, but their evaluation. To try and make that evaluation easier, this thesis focuses on the collection of data that can be used as positional ground truths using an autonomous measurement platform. This should assi

This thesis examines the possibility of modelling trajectory and estimating distance during a walk using only a smart phone attached to the waist. Due to GPS not functioning indoors, a navigation system without the need of external communication could be the perfect complement for closed spaces. This thesis considers such a system, where the smart phone contains accelerometer and gyroscope sensors

The study was carried out to identify critical factors for processed fruit shelf life in Tetra Recart packages. To investigate the importance of package volume and headspace volume, vitamin C was chosen to be the indicator. Oxygen in headspace, headspace volume, dissolved oxygen in product, oxygen transmission rate (OTR) and the concentration of vitamin C along storage time were measured to unders

This bachelor thesis evaluates the use of Clustering and Regression to separate good images from a given set of images. Whether the images are good or not is decided by the customers of the company that this system is developed for. In this thesis these customers are represented by a number of test persons. The images have been analysed with Amazon’s service Amazon Rekognition where the answers ar

Genom att ta bilder i specifika våglängder på växer, från det visuella till det osynliga, kan man ta reda diverse information om växter såsom biomassa och stress. Detta kan man då göra med multispektrala kameror som oftast har varit monterade på satelliter. Satelliter har dock problem såsom eventuella molntäcken som täcker vyn över växterna. Drönare med multispektrala kameror har därmed blivit all

In this paper we discuss the problem of finding a suitable filter used as prefilter at digital Kalman filtering. The process is described by a stochastic state model. Two different filters are analyzed: a low-pass filter and a mean value filter. Especially we examine optimal choices of the parameters of the filters i.e. optimal integration area in the mean value filter and optimal time constant in

The consequences of early rheumatoid arthritis were studied in a series of patients treated at University Hospital, Lund, during the period 1985-1989. Mean disease duration at enrollment was 12 months. Most of the patients have now been followed prospectively for five years, during which time disease activity and pain have increased markedly. Ability to perform the activities of daily living (ADL)

Popular Abstract in Swedish I de flesta reglerproblem är syftet att hålla utsignalen nära ett önskat värde trots störningar som påverkar systemet. Ibland är det bästa referensvärdet inte känt i förväg. I stället skall det hittas i realtid för att optimera systemets prestanda. Denna avhandling behandlar en så kallade probing-strategi som kan tillämpas för denna klass av problem. Fokus ligger i till

Three methanogenic biofilm bioreactors were studied to evaluate the performance of three types of carriers. The carrier material were consisted of sisal fibre waste, pumice stone and porous glass beads, and the bioprocess evaluated was the methanogenesis anaerobic digestion of sisal leaf waste leachate. Process performance was investigated by increasing the organic loading rate (OLR) step-wise. Th

We studied electrophysiological properties of single chemosensory neurons in the mouthparts of the spiny lobsters Panulirus argus and Panulirus interruptus to complement our growing understanding of the behavioral roles of mouthparts of decapod crustaceans. Food mixtures and 13 single compounds were used to characterize the response specificity, sensitivity, and time course of individual neurons i

We consider the “minor” and “homeomorphic” analogues of the maximum clique problem, i.e., the problems of determining the largest h such that the input graph (on n vertices) has a minor isomorphic to Kh or a subgraph homeomorphic to Kh, respectively, as well as the problem of finding the corresponding subgraphs. We term them as the maximum clique minor problem and the maximum homeomorphic clique p

Electromagnetic induction measurements (EM) were taken in a saline gypsiferous soil of the Saharan-climate Fatnassa oasis (Tunisia) to predict the electrical conductivity of saturated soil extract (ECe) and shallow groundwater properties (depth, Dgw, and electrical conductivity, ECgw) using various models. The soil profile was sampled at 0.2 m depth intervals to 1.2 m for physical and chemical ana