To mitigate microbial activity in swimming pools and to assure hygienic safety for bathers, pool systems have a re-circulating water system ensuring continuous water treatment and disinfection by chlorination. A major drawback associated with the use of chlorine as disinfectant is its potential to react with organic matter (OM) present in pool water to form potentially harmful disinfection by-products (DBP). In this thesis, the treatment performance of different combinations of conventional and novel treatment processes was compared using a pilot scale swimming pool model that was operated under reproducible and fully controlled conditions. The quality of the pool water was determined in means of volatile DBPs and the concentration and composition of dissolved organic carbon (DOC). Further, overall apparent reaction rates for the removal of monochloramine (MCA), a DBP found in pool water, in granular activated carbon (GAC) beds were determined using a fixed-bed reactor system operated under conditions typical for swimming pool water treatment. The reaction rates as well as the type of reaction products formed were correlated with physico-chemical properties of the tested GACs.

Drought related problems are a major stress source on the livelihood of communities in several areas of the world. Due to inefficient water resources management people leave their traditional habitat in search for security in larger agglomerations. This creates a big stress on the carrying capacity of urban centers and leaves deserted rural areas incapacitated. Setting Sustainable Development Goals as targets to reach, using Resilience Thinking to provide for resilience, adaptability and transformability, and planning for Integrated Water Resources Management can be a solution to reduce this outmigration. Rajasthan is a state in India where communities have been surviving with very little available water for ages. Contemporaneous implementations in parts of Rajasthan fulfill the framework set for this study. After identifying a promising SES in terms of drought resilience a field investigation was conducted for adequate assessment and model of resilient SES was reverse engineered from the findings. Reading thru this document one can explore the uniqueness of Rajasthan water governance from pasts long gone and to the current date. In the end of the study strategic adaptive planning recommendations can be found for creating a similar SES.

Mitt i gränsen mellan stadsdelarna Västertorp och Hägerstensåsen i Stockholm ligger den avlånga Mellanbergsparken. I det norra kortändan hittar man Hägerstensåsens tunnelbanestation och i den söndra går den mycket trafikerade motorleden E4an. Det är en platt park med få träd så den är starkt bullerstörd från E4an. I den söndra ändan finns ett utomhusbad som är välbesökt varma sommardagar, men  motorvägens närvaro går inte att ignorera, så badupplevelsen blir inte fullt så avslappnande som den skulle kunna önskas. Västertorps parkbadhus är tänkt att ligga i det sydvästra hörnet och då fungerar som skydd mot bullret. De högsta delarna i byggnaden hamnar närmast motorvägen för så stor bullerdämpning som möjligt, och för att minimera skuggningen av parken och utomhusbadet. Hela byggnaden är dessutom täckt med ett spaljésystem där klätterväxter kan slingra sig, och de tillsammans med den skog som planteras på markplätten som lämnats mellan byggnaden och motorvägen, bidrar ytterligare till bullerdämpning, samt till luftrening från alla avgaser. Entrén till parkbadhuset och dess tillhörande sporthallar är belägen i en gångtunnel som går genom byggnaden från den nuvarande gångtunneln under Personnevägen. För upplivning av tunneln och förståelse av byggnadens funktion finns här fönster in den djupa hoppbassängen. Själva simhallen är sammansatt av tre volymer som har olika takhöjd och nivå på golven som skapar flera typer av rumsligheter i ett och samma rum. Mellan de tre delarna finns dessutom höga pelare med metallstag emellan som stabiliserar den stora hallen. Längs dessa växer klätterväxter som tar in parkupplevelsen även inomhus. I den minsta volymen, ägnat främst barnen, finns också stora träd planerade som skapar nya rum mellan dem samtidigt som de förbättrar luftkvaliteten. / Amid the border between the districts Västertorp and Hägerstensåsen in Stockholm is the elongated park "Mellanbergsparken" situated. In the northern short end of the park you find Hägerstensåsen subway station and in the southern end is the highly trafficked freeway E4. The park is a flat landscape with few trees so the loud noise from the E4 is much disturbing. In the southern end is an outdoor swimming pool that is frequented hot summer days, but the presence of the motorway can't be ignore, so the experience of bathing will not be quite as relaxing as desired. The Park Bathhouse in Västertorp is supposed to be located in the southwest corner and then acts as noise protection against the motorway. The highest parts of the building are closest to the freeway for as much noise reduction as possible, and also to minimize shading of the park and outdoor bath. The entire building is additionally covered with a trellis system where vines can wriggle, and they, together with the forest planted on the land between the building and the highway, further contributes to noise reduction as well as air purification from all exhaust. The entrance to the park bathhouse and its associated sports halls are situated in a pedestrian tunnel that goes through the building from the existing underpass under Personnevägen. For understanding of the building's function there will be windows that go in to the deep diving pool. The swimming pool hall is composed of three volumes that have different height and level the floors, creating several types of spatial features within a single room. Between the three components is also high pillars with metal rods between which stabilizes the large hall. Along these wriggle vines that take the park experience indoors. In the smallest volume, devoted mainly to children, there are large trees planted, creating new rooms between them while improving air quality.

Beståndsdelarna som bildar betong är ballast, cement, vatten och ibland olika tillsatsmedel och tillsatsmaterial. När betongen blandas startar hydratationen som leder till att cementpastan expanderar och värme frigörs. Hydratationshastigheten avtar med tiden vilket gör att cementpastan efter en viss mognad kommer kontrahera. Dessa töjningsrörelser kan under olika omständigheter bidra till att sprickor uppstår. Sprickorna kan begränsas eller elimineras med hjälp av olika åtgärder.   Genom redogörelse för hur ingjutna kylrör minskar risken för att temperatursprickor uppstår i ung betong vid uppförandet av en simbassängkonstruktion kan syftet uppnås. Rapporten avgränsas till den första och andra fasen i betongens hårdnandeprocess.   En fallstudie har genomförts där metoden innefattar en intervju och dialog med sakkunniga, läsning i rekommenderad litteratur från företaget samt observation av arbetet innan, under och efter gjutning. Datan har verifierats för att bibehålla korrekt information.   Förekomsten av sprickor påverkas av olika faktorer som betongreceptet, mängden armering och temperatur. En konstruktions geometri med planerade gjutetapper är också betydelsefull för minimering av sprickor.   Ingjutna kylrör fördelar temperaturen i betongkroppen för att undvika att en för hög temperaturdifferens uppstår mellan betongens kärna och yta. Detta gör att betongens inre delar inte kommer expandera lika mycket och skapa ett inre tvång, på grund av värmen som hydratationen bidrar till. Värmeutvecklingen för de olika delarna har registrerats med hjälp av temperaturmätare, vilka resulterade i olika diagram.   I simbassängen uppkom inte några temperatursprickor. Dock var det svårt att urskilja om det var på grund av det specifika betongreceptet som användes eller om kylningen var den bidragande faktorn till resultatet.

Populations of the sympatric intertidal bivalves, Macoma secta and M. nasuta are compared as to reproductive ecology and population dynamics. Histological examination of seasonal gonadal changes indicate that both species undergo dormancy in the winter months and rapid gamete proliferation in the spring. However, the timing of spawning differs. The M. secta population synchronously spawned in August while the M. nasuta population spawned lightly in late spring and more heavily in the fall. Fecundity estimates indicate M. nasuta adds 140% of winter weight in gametes and M. secta only adds 43% of winter weight in gametes. Spat fall was detected in January for both species and was light in intensity, for either species only 24 per m2. Nursery areas were determined for M. nasuta, which corresponds to adult distributions, and for M. secta, which correspond to the upper and lower fringes of the intertidal distribution but not the center. Analysis of variance on distributional data indicate the temporal stability of density and size for M. secta. M. nasuta densities were also temporally stable but sizes were not. Both species demonstrated significant changes in density with tidal height. A measure of seasonal population variability, the Population-Time Mean Square, was found to have zero correlation with tidal height for M. secta, meaning that environmental stress was the same for individuals at each tidal height . This is believed related to the gradient of calm size to tidal height. An argument for density dependence in M. secta is given with emphasis on individual growth and realized population fecundity; the null hypothesis: As density increases, the resources per individual decrease, therefore the growth rate of individuals decreases. Analysis of sympatric populations indicate differing patterns of life history, pointing out that selection has favored these two species coexistence. Analysis of population dynamics indicated that in comparison to M. nasuta (Low Tide Horizon), M. secta (Mid Tide Horizon) was more stable (terminology from Ricketts, Calvin and Hedgpeth, 1969). This supports Castenholz’ (1967) idea that where climates are mild, the intertidal communities are more stable than the subtidal communities.

The current industry landscape is witnessing a trend towards high-mix production, which requires a reconsideration of the existing production systems. Although high levels of automation have been achieved in the industry, the traditional automated production line, designed for mass production of homogeneous goods, is not well-suited for high-mix production. To address this situation, flexible and adaptable alternatives have been sought to replace the inflexible and rigid traditional production lines. One of the proposed solutions is the combination of digital technology and physical automation, creating a highly connected and intelligent production environment. Such an environment requires the implementation of a cyber-physical production system that integrates Industry 4.0 technologies, such as Automated Guided Vehicles (AGVs) and flexible robots. This system enables a set of robots to perform different tasks instead of being exclusively dedicated to a specific task, making it moreadaptable and flexible. The integration of advanced technologies, such as AGVs and Cyber-Physical Production Systems (CPPS), can significantly enhance workflow optimization, reduce production times, and enable flexible layout adaptations to cater to the specific requirements of different products in the production line. Furthermore, it can facilitate better control of information and enable real-time monitoring of the production process, leading to improved production efficiency and quality. To demonstrate the potential of such a system, a virtual commissioning of a fully innovative production line has been carried out, encompassing all the previously mentioned technologies and elements. The virtual commissioning of the production line serves as a proof-of-concept for the cyber-physical production system and its ability to provide a highly connected, intelligent, and adaptable production environment. / <p>Utbytesstudenter</p>

This thesis examines the relationship between the forestry industry and indigenous Sámi peoplein northern Sweden, focusing on institutional mechanisms for resolving land-use conflictsregarding forest logging on reindeer herding lands. Sámi reindeer herding communities andforestry companies have overlapping usage rights, making Swedish forests a common poolresource. Clear-cut forestry is damaging the reindeers’ access to lichen and the long-termsurvival of traditional reindeer herding, creating a need for effective Sámi influence in localforest decision-making. This study analyzes the recently reformed institutional framework forparticipatory planning and consultations, as well as participants’ experiences of Sámi influence.Interviews were conducted with three Sámi RHCs, two Sveaskog employees and one ForestAgency official. The theoretical framework draws from literature on co-management, commonpool resources and free, prior and informed consent to analyze Sámi space for influence. Resultsshow that the changes in regulations and practices have enabled RHCs space to withdrawconsent to specific logging plans under specific conditions, but influence is still limited. TheForest Agency has not consulted RHCs despite the new law, indicating continued difficultiesfor Sámi people to influence logging decisions on a local level. The main contribution of thisstudy is showcasing remaining barriers and positive developments based on original empiricalinterview material.

The author explores the current state of information exchange and access in the procurement process for mobility assistive equipment. While the idealized model is of a linear process starting with a need and ending with the purchase, in practice the procedures for acquiring a device such as a wheelchair or electric scooter can be a time consuming task that involves client, family, medical care specialists, vendors, manufacturers, insurance companies and possibly alternate sources of funding. This study utilized Participatory Action Research (PAR) to collect both qualitative and quantitative data about information sources such as the Internet, the medical community, and vendors. The findings of this study suggest that in spite of the presence of the Internet, overall primary sources are similar to the traditional model and that for most there is no one source that could be easily accessed for information. A brief examination is made of the “Information landscape” utilized in the process and a brief discussion of two relatively unmentioned information sources: expos and the wheelchair sports community.

Universal screening is an emerging practice in the field of education to provide at-risk students with early intervention services. Currently there is not a universal screener specifically designed for the middle school population. Therefore, the purpose of this study was to obtain junior high and middle school teachers' perspectives on behaviors exhibited by students at risk for emotional and behavioral disorders in order to develop preliminary test items. Several themes were identified from the teachers' perspectives. Teacher perspectives noted that at-risk students displayed a variety of internalizing and externalizing behaviors. These issues included difficulty maintaining peer and teacher relationships, difficulty with hygiene and sleep, challenging home and school relationships, and noncompliant behaviors. From these themes, the researcher created an initial item pool of 24 items, which can be used for future development of a screening instrument.

The use of nanofluids as heat transfer fluids has received a lot of attention from the heat transfer research community. Due to the increased thermal conductivity of nanofluids over their base fluids, the number of nanofluids scientific publications increased significantly in the past decade. The effects of the heated surface roughness, nanoparticles and surfactant concentrations on pool boiling of nanofluids have been thoroughly investigated. However, contradicting findings have been observed under what appeared to similar test conditions. In this experimental investigation, two boiling surfaces have been prepared with an average surface roughness of 6 and 60 nm using high precision machining. Alumina Oxide-Water based nanofluids have been used in this investigation. The initial nanoparticle size reported by the manufacturer is 10 nm. The nanoparticles concentration has been kept at 0.05 wt. %. A Sodium Dodecylbenzenesulfonate (SDBS) surfactant has been added to the nanofluids in order to improve its stability. Results showed that the nanofluids boiling performance depended on the boiling surface roughness. The heat transfer coefficient (HTC) obtained in the case of the smooth, mirror finished surface showed an enhancement of 205% with respect to pure water. This trend was reversed in the case of the rough surface which is believed to be due to significant nanoparticles deposition. The HTC obtained with the rough surface was 12% lower than that of pure water. The effect of the surfactant concentration on nanoparticles deposition has been investigated by changing the surfactant concentration from 0.1 to 1.0 wt. %. In the case of the rough surface, the increase of surfactant concentration was found to reduce the formation of the nanoparticles deposition layer. The HTC obtained with the higher surfactant concentration was increased by 46 %. The effect of nanoparticles concentration on the smooth surface shows an unexpected trend of 20 % reduction of the transfer rate of the nanofluids coupled with the increase of the nanoparticle concentration from 0.05 to 0.1 wt. %. However all concentrations showed heat transfer enhancement with respect to pure water. The minimum heat transfer coefficient ratio enhancement was 11 % using 0.1 wt. % nanofluids with respect to pure water. Since nanoparticles deposition has been observed and attributed to micro-layer evaporation, an investigation has been carried out to examine the nucleation process during the pure water and nanofluids pool boiling. The bubble growth rate in both cases was analyzed at different wall degrees of superheat ranging from 104.3 to 105.9 ºC. In addition, the bubble departure diameter and frequency have been measured and compared for both cases. The nanofluid bubble size was about 80 % smaller than that of pure water. The nanofluid bubble departure had almost constant frequency of 500 Hz over the range of wall superheats whereas the maximum bubble frequency in the case of pure water was 22.72 Hz. / Thesis / Master of Applied Science (MASc)