This study investigated the development potentials in the mineral processing plant of Björkdal. The flotation processes were explored with the purpose of finding out how to achieve a higher and a more uniform gold recovery with adapted choices of parameters. A material balance was carried out to describe in what flows the gold was distributed the current day of sampling. The material was sampled, prepared, and analysed according to gold grade. The sampling method of grab sampling was used and samples from seven occasions during the day were added and created the sample of the day. The sizes of the samples were based on experience but were checked by the Gy´s sampling formula. The sampling was performed during three days and the results were compiled in three material balances, one of which was a fraction balance. The pulp flow, the solid flow and the gold flow were documented as material balances. Deficiencies in the form of imbalances between inflows and outflows were corrected by a method of data reconciliation. The balanced measured values were used for analysis and documentation.In the mine of Björkdal the pH values were measured in the flotation processes. The residence times of the flows through the flotation plant was calculated from the material balance. The additions of reagents were noted and scaled down to the conditions of the laboratory. The conditioning was not included in the Björkdal process.In the flotation experiments at the Mineral processing laboratory, Luleå University of Technology, the influence of the adaptable parameters on the gold recovery was investigated. The following parameters were included in the experiments: pH, flotation time, particle sizes, conditioning time, and reagents additions. The conditions in the Björkdal plant were scaled down to correspond to those of the flotation cells of RÅ0 and RÅ1-3. For the experiments the material was sampled from the RÅ0 entry flow and from the Flotation entry flow. The material samples from the Flotation entry flow replaced the RÅ1-3 entry flow to imitate the conditions of the RÅ1-3 cell. This simplification was motivated by the practical sampling conditions.The results showed that it was possible to achieve a higher gold recovery by adapting pH, residence time and particle sizes. The gold recovery appeared to be independent of conditioning time. The experiment with reagent additions as parameter indicated that higher reagent additions resulted in faster flotation in the introduction part of the process. The report summarized graphically the measurements from the material balance and the flotation experiments in order to give best possible survey of the dependences between parameters and gold recovery. The experiments made it obvious that higher gold recovery resulted in lower gold grade. Therefore a compromise of adjustment between gold recovery and gold grade is important to consider. Variations of the gold recovery could be connected to the geological conditions. In the report significant results were documented. / <p>Validerat; 20130618 (global_studentproject_submitter)</p>

Bakgrund: Hundterapi är ett relativt outforskat område, i dagsläget finns det en begränsad mängd med evidensbaserad forskning rörande vårdhundens effekter. Vårdhunden har många olika användningsområden inom sjukvården. Sjukdomar som demens och psykisk ohälsa är vida utbrett i världen och det syns en ökning av personer som drabbas av demens vilket kan kopplas till en ökad medellivslängd. Syfte: Syftet med denna litteraturstudie var att beskriva vårdhundens effekter på välbefinnandet hos personer med kognitiv nedsättning samt att som metodologisk aspekt beskriva på vilket sätt hunden använts som oberoende variabel i studiernas interventioner. Metod: En deskriptiv litteraturstudie där tio kvantitativa experimentella studier har granskats och sammanställts. Huvudresultat: Sammanställningen av studierna gav tre olika utfall, förbättrad effekt, försämrad effekt samt oförändrat utfall. Flera av studierna visade på att vårdhunden hade minskat deltagarnas depressiva symtom och deras nedstämdhet. Samtidigt syntes en ökad emotionell stabilitet samt en minskad ångest och aggressivitet hos deltagarna. De ingående studierna visade även en försämrad effekt av välbefinnandet och en ökning av dementa symptom vilket yttrade sig genom att deltagarna blev mindre adekvata och mer verbalt aggressiva, huruvida denna effekt berodde på vårdhunden framkom inte. Utifrån den metodologiska frågeställningen framkom det ur studierna att deltagarna fått klappa, leka, utfodra, promenera samt fått välja själva hur de spendera tiden med hunden. Slutsatser: Ur litteraturstudien framkom det förbättrade effekter på välbefinnandet hos deltagarna med kognitiva nedsättningar efter hundterapin, vilket framhåller hundens hälsofrämjande egenskaper. Vidare saknade stora delar av de ingående studierna statistisk signifikans och blev därför inte tillförlitliga. Det behövs därför mer evidensbaserad forskning för att kunna fastställa vårdhundens effekter inom området. / Background: Dog therapy is an unexplored area within the field of nursing, to date there´s a lack of evidence based research regarding the therapeutic effects of the dog in health-care. The therapy dog has a variety of areas in the healthcare which it can be used. Dementia and mental illness is a widely spread over the world and there is an increase in people diagnosed with the disorder, it´s thought to be related to increased average life expectancy. Aim: The aim of this literature-review was to describe the effects of the therapy dog on the wellbeing on patients with cognitive dysfunctions and as methodological aspect describe in which way the dog has been used as an independent variable in the interventions of the studies. Method: A descriptive literature-review where ten quantitative experimental studies has been reviewed and complied. Main result: The result of the included studies were summarized under three different outcomes, improved effect, degraded effect and unchanged effect. Several of the studies showed a decrease in the participant’s depressive symptoms, it was thought to be due to the effects of the dog. The participants showed an increased emotional stability and a reduced grade of anxiety as well as decreased aggressive behavior. The outcome of the included studies also showed a decreased tendency in the participant’s self-experience quality of life and an increased frequency of dementia symptoms, which were revealed as les adequateness and more verbally aggressive. Based on the methodological question the studies showed that the activities the participants did during the intervention were; pet the dog, play with the dog, feed it, take walks with the dog and they could choose individually what they wanted to do. Conclusion: The literature- review revealed that the therapy dog had a improved impact on the participants wellbeing after the intervention, compared to before the intervention. This emphasizes the dog´s health-promoting characteristics. Furthermore, the outcome of the literature- review shows that the result from the included studies lack statistical significance, therefore these results were not counted as reliable. The present review underlines the need for further evidence- based research regarding the health-promoting effects of the therapy dog.

Diss. (sammanfattning) Umeå : Univ., 2004. / Härtill 6 uppsatser.

Diss. (sammanfattning) Stockholm : Karol. inst., 2002. / Härtill 6 uppsatser.

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 5 uppsatser.

Diss. (sammanfattning) Umeå : Univ., 2005. / Härtill 5 uppsatser.

Diss. (sammanfattning) Stockholm : Karol. inst., 2003. / Härtill 5 uppsatser.