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The main advantages of polymer gears in comparison to metal gears are low manufacturing costs for mass production, vibration damping and no need for lubricant. In the literature and guidelines, the allowable gear endurance limits for bending and contact stresses are mainly given for polyamides (PA) and polyacetals (POM). The large number of suitable polymer gear materials is available, but the sta
The critical impact of air pollution on human health and environment in one hand and the complexity of pollutant concentration behavior in the other hand lead the scientists to look for advance techniques for monitoring and predicting the urban air quality. Additionally, recent developments in data measurement techniques have led to collection of various types of data about air quality. Such data
Based on the experiences from a social innovation process ofSwedish preschool remodelling – aiming to enhance equal and inclusivelearning and play – the study investigates socio-material dimensions incomplex multi-actor/level (ex)change. Previous studies on systemic changethrough social innovation ecosystems help reveal dynamics and challenges inthe coordination of varying logics and interests amo
Fathers are expected to play an increasing part in the care of children, but fathers are not automatically included in studies of early childhood. In this paper we present Swedish fathers' experiences of child health care. In the study, a total of 237 out of 279 (85%) fathers of small children were telephone interviewed using a structured questionnaire. As many as 165 (70%) had visited the child h
To address the challenges of an ageing population, it is important to promote health by identifying factors for healthy ageing. The aim of this study was to investigate the bidirectional association between physical activity (PA) and sleep in healthy Japanese super-seniors over the age of 80. For approximately 1 year, 124 participants wore wearable devices and answered daily lifestyle questionnair
The brick kiln at Saltsjö Boo is one of very few such structures known from medieval Sweden. Approx ¾ of the kiln has been excavated in successive short excavations from 2006 to 2011. Carbon 14 and TL (Thermoluminiscence) analyses indicate that the kiln has been in operation from c. 1250 to c.1450. This paper presents the results of the excavations and discusses the production of bricks and indust
The reassignment technique is used to increase localization for signal components in the time-frequency representation. The technique gives perfect localization for linear chirp signals and constant frequency signals. Despite the recent interest in using the reassignment technique to determine phase-shifts, no general expression of cross-spectrogram reassignment vectors exists. This submission aim
In computer graphics, there are numerous aspects that must be considered when rendering images of virtual scenes:What physical light-generating phenomena do we care about? How should object and material surfaces be described? And how should these be stored to ensure as fast and efficient image rendering as possible?As a part of this thesis, a method for rendering images of scenes lit by virtual at
This article deals with study of ionization current sensing technique's signal characteristics while operating with pre-chamber spark plug to achieve plasma jet ignition in a 6 cylinder 9 liter turbo-charged natural gas engine under EGR and excess air dilution. Unlike the signal with conventional spark plug which can be divided into distinct chemical and thermal ionization peaks, the signal with p
Crystal plasticity models are often used to model the deformation behavior of polycrystalline materials. One major drawback with such models is that they are computationally very demanding. Adopting the common Taylor assumption requires calculation of the response of several hundreds of individual grains to obtain the stress in a single integration point in the overlying FEM structure. However, a
Second derivative regularization methods for dense stereo matching is a topic of intense research. Some of the most successful recent methods employ so called binary fusion moves where the combination of two proposal solutions is computed. In many cases the fusion move can be solved optimally, but the approach is limited to fusing pairs of proposals in each move. For multiple proposals iterative b
Sixty guinea pigs were exposed to a steady-state broadband noise with a falling frequency spectrum. The sound-pressure level was varied between 96 and 117 dB SPL, and the duration of the exposure was varied from 3 to 12 h. After 4-5 weeks, the auditory thresholds were determined by electrocochleography at 14 frequencies, and the results were compared with a control group. With increasing sound-pre
The present study examined programmed death-1 ligand-1 (PD-L1) detected by immunohistochemical. labeling in 102 cases of human gastric carcinoma, 10 adenoma and 10 normal tissues. The relationship between PD-L1 immunolocalization and clinical pathological features, as well as the prognosis of gastric carcinoma, was explored. There was no PD-L1 detectable in normal gastric tissues and very weak imm
Popular Abstract in Swedish Att opereras via titthålskirurgi eller öppen kirurgi med en operationsteknik som förhindrar sura uppstötningar och halsbränna - en slumpmässig jämförande studie från ett patientperspektiv Utdrag ur avhandlingen Laparoscopic or open surgery - A comparative study with special reference to the patient's perspective av Gunilla Nilsson Vad är problemet? Gastroesofageal reThe overall aim of this thesis was to compare the effects of laparoscopic versus open antireflux surgery in a randomized clinical trial focusing the patients' subjective and objective outcome postoperatively, from a short-term and a long-term perspective. A further aim was to describe GORD patients' experiences of illness and surgical treatment and if possible to find striking characteristics rela
Indoor positioning is recognized as one of the upcoming major applications which can be used in wide variety of applications such as indoor navigation and enterprise asset tracking. The significance of localization in indoor environments have made the use of Wi-Fi based indoor positioning so that it can utilize available current wireless infrastructure and perform positioning very easily. In this
The structure, stability, and hydrolysis characteristics of beta-lactoglobulin (LG) A are different from those of either beta-LG B or beta-LG C. Purified samples of these proteins were hydrolyzed with trypsin and the rates of loss of native monomeric beta-LG structure were measured using sodium dodecyl sulfate PAGE. At the same time, the appearance of many individual peptides were identified and f
Schema för KURSNAMN 10 p (15 ECTS) VT -2 2003 Schedule for GEOM08, 15 hp (15 credits) Spring-1 2021_ vs. 2020-03-15 Metamorphic Petrology Course coordinator: Charlotte Möller Teachers: CM = Charlotte Möller, CU = Cindy Urueña, CA = Carl Alwmark, US= Ulf Söderlund E-mail to teachers: name.surname@geol.lu.se Guest lecturer Bedrock quality: Jenny Andersson, Geological Survey of Sweden Guest lecture C
https://www.geology.lu.se/sites/geology.lu.se/files/2021-03/GEOM08_Schedule--2021_2021-03-15.pdf - 2026-06-25
https://www.hr-webben.lu.se/arbetsgruppen-lu-rals - 2026-06-25
