Aquaponics is a food production system consisting of a consecutive cultivation of plants and aquatic animals, fish or shellfish, in recirculating water. The plants feed on the nutritious effluents from the fish tank and bacteria converts ammonia from the fish tank into nitrate that is absorbed by the plants. The plants receive nutrition and the fish gain purified water. The environmental impact of the production of fish meal and fish oil used in conventional fish feed includes a large consumption of fossil fuels with subsequent carbon dioxide emission. The aquaponic system can be made environmentally sustainable and self-supporting if supplemented with a vermicompost/vermiculture for the production of worm protein as a fish feed. Vegetable waste from the hydroponic part of the system can be reused as worm feed in the compost and the protein rich worms can be harvested, dried and grinded and brought back to the aquaculture as fish feed. As a first step in this direction, I have investigated the effect of recycling of vegetable waste in vermicomposts on the growth and number of earthworms (this was evaluated after harvesting). The hypotheses were that earthworms can be cultivated in the vegetable waste and that by adding manure to the vermicompost it is possible to obtain a nutrient content adequate to support a continuous worm harvest, in other words create a vermiculture. Eisenia fetida and Dendrobaena veneta were grown in 20 L bins containing peat mixed with either poultry or cattle manure. The proportions were 70% peat and 30 % manure. Discarded plant parts from lettuce cultivation was added to the vermicomposts (35 g per week) and water was supplied with 0.8 L per week.

Today?s electrical grid companies understand that better knowledge of and information about their grid can help realize a smart grid network. One way to gain better knowledge and information about the low voltage network is to install measuring equipment on the substation transformer´s secondary low voltage side that measures the low voltage network losses for that specific substation. By doing so, grid companies can, due to the calculation of the low voltage network losses, identify and address issues such as illegal power dissipation, unmeasured power outtakes, and unsatisfied technical documentation for the substations low voltage network.During 2012, Mälarenergi Elnät AB had a total electrical network loss (both medium and low voltage network losses included) of three to four percent of their total distributed electrical volume. Converting this energy volume into a monetary figure this accounts for a loss of around 30 million Swedish crowns.

Background: Multiple Sclerosis (MS) is a chronic disease that mainly strikes young people in working age, twice as many women than men falls ill. Approximately 85 % suffers from MS-related fatigue that divides itself from common fatigue in that way that it is persistent and does not disappear in spite of sleep. This fatigue is experienced of many as one of the most difficult symptoms, which has considerable impact on the everyday life. Aim: The aim with the study was to elucidate how MS-related fatigue was experienced by persons with MS. Method: The study has been implemented as a literature study through systematic review of scientific articles.

The education sector can be seen as a cornerstone of today's society, an organization that is under constant change and evolve as society. The compulsory school system is of significant role in society that places high demands on its management. The following study investigates the requirements for documentation in primary school organization and operations, and how these requirements are perceived and affect the school's organization and activities of the study carried out at different levels of the organization so as to get an overall picture of its impact. In order to analyze and create understanding of the results, the study applies the theory of New Public Management and various reforms that can be linked to the increased documentation requirements and its influence in the public administration. Study results show that there is a mixed picture of the documentation impact on the school system. Shown are both positive and negative effects of the documentation requirements.

The pig is unique in the way that it gives birth to a large number of newborns in each litter. Because of this the sow has developed a special behaviour during suckling to ensure that not only a part of the litter gets all the milk. Milk is only available during milk letdown. The piglets have to massage the udder for a long time before letdown and the more piglets at the udder the sooner the milk comes. The sow has developed a special grunting pattern to let the piglets know when she is ready for suckling and to signal milk letdown. Our aim with this study was to investigate if sows have individual grunting patterns repeated over time. We also wanted to know if sows with a more distinct grunting pattern have better growth in their litters.

This thesis has the overall objective to develop the optimum sealing system between the retarder and transmission. Today, there is a pressure-relief and two radial seals separation between the retarder and transmission. It has been found that carbon residue formation may occur between retarder axle and seal lips with, in some cases, leakage as a result.We have in this thesis tried to explain the phenomenon of carbon residue, how it is formed and why it can be seen just on the seals? A rig test was conducted where we show how friction, speed, transmission temperature and mitigation phases of the retarder affects temperatures in the sealing environment. Factors affecting the coke structure are reported, together with proposals for measures that provide a mitigating seal environment.

This study is done on behalf of Södra skogsägarna in the autumn of 2012. The main purpose of the study is to get an explanation to why some of the members are passive in their forestry, and how Södra can stimulate them to become more active. To achieve this a questionnaire study was conducted on the members of Södra in the community of Gislaved. The result of the study shows that there are many different factors that influence whether the forest owner is active or not. Examples of those factors are timber prices, the forest owner's objectives and the forest owner's financial situation. The main goal for the forest owners in the survey was to obtain high economic result and to increase the standing timber volume for the next generation.

This thesis investigates how web agencys in Stockholm use, value and incoroprate the terms usability, user experience and interaction design in their work process. The purpose of this study is to investigate how creative professionals works with the notions of usability, user experience and interaction design with focus on the end user. Our definition of creative professionals is every employee at a web agency involved in the work process of developing digital artefacts in any capacity. We wanted to investigate how these notions are considered, consciously or unconsciously, during the workprocess. Semi-structured interviews were conducted at three different web agencys with eight different employees.

The study aims to shed light on the phenomenon of employeeship at a Swedish Staffing Agencise . This has been done on the basis of two questions. How can employeeship look like in a service? What is the role given employeeship in developing contexts? In order to answer the purpose and issues have a quantitative approach been used. Based on the theoretical frame of reference has the form of surveys created.

Customer service has traditionally consisted of telephone, mail, and later on chat.But the entry of social media has changed the way companies exercise customerservice. Companies should ask themselves whether the same type of traditionalcommunication may or may not function in a new channel and thus whether itcan be applied to social media.The purpose of this study is to describe the companies? use of customer servicein social media and how the communication differentiates from thecommunication in traditional customer service, and also to define the effect onthe customers? relationship to the company. To reach our conclusions we havecombined theoretical references with qualitative interviews.By our analysis, we found that the communication in social media expandsthe possibilities. By entering an unfamiliar channel, customer service has hadto adapt themselves and their language.

The purpose of this study was to examine the problematic and frustrating aspects of parenthood in the modern runaway world of today. In other words, we wanted to study how parents in Sweden experienced their life as parents in the beginning of the 21th century.We wanted to find answers to the following questions:What kind of problems do parents experience and how do they deal with these problems?What would parents consider to be typical for them as parents compared to how they remember their own parents?What do parents think about family politics?Do parents think they need parent education?If parents want parent education, why do they want it?To answer these questions we used qualitative interviews. With this method we got information from six parents and five professional parent educators who was kind enough to let us interview them. We also gathered information about the subject through literature and news articles.The result of the study can be divided into three parts.

The aim of this report was to investigate the hypothesis that Norway spruce (Picea abies L. Karst), planted on poor ?Scots pine? stands will not have sustained growth during the whole rotation, due to water deficit in the closed stands. In order to investigate this hypothesis, data from 10 Norway spruce stands in southern-eastern Sweden were collected. In 10 plots in each stand, diameter and breast heights were measured on every tree.

When a child is diagnosed with diabetes the whole family is affected. The effect of the illness often means drastically changes to their daily life. The aim of this study has been to describe the experiences of the parents´ having a child fallen ill with diabetes. The study has been done as a general literature study. The procedure has been to systematically search, critically investigate and summarise results from different studies made on the chosen area of subject.

This Masters thesis is analysing four Swedish novels written by first time authors published between 1993-2002. The purpose is to make the fictitious main characters illustrate what conditions and obstacles there can be for the individual of today to create a self-identity. Anthony Giddens ideas about the self in the late modern society are used as a theoretical framework. In the core of Giddens theory is the concept of reflexitivity which means that the self must be constructed in a continuous fashion because the overall conditions in society are subject to constant change. The questions posed in this study are dependable on Giddens in general and the concept of reflexivity in particular.

This master thesis work was done at Saab Underwater Systems AB, a company at the cutting edge of underwater technology. Here torpedoes and other underwater vehicles are developed and manufactured. The major customers are navies of different countries, mostly the Swedish navy. The aim of this master thesis is to develop, construct and evaluate an automatic Trim System for Unmanned Underwater Vehicles. The task of the system is to change the position of the centre of mass and the vehicle?s total mass or volume.