This bachelor thesis is about an ultrasonic sensor, implemented in a bubble chamber in Artis. The sensor consists of the piezoelectric sensor and an electronic control circuit. The control circuit consists of a programmable microprocessor, PIC18F2420 and a circuit, which sends the excitation signal to the piezoelectric sensor, and later receives the echo. This bachelor thesis consists also of a theoretical study, which examines different techniques of liquid level sensing in a chamber. The study discusses which factors are important in liquid level sensing and examine accepted methods.

In my essay I have examined how teachers look upon their role as leader in the classroom. I have interviewed six teachers, senior level ones and teachers from the upper secondary school, about how they look upon tasks that involve planning, control, motivation, groups, and individuals. Based on their answers, I have analyzed if there is anything that can be related to a common leader competence within their profession and, in that case, how it will appear.The result that I have found has been that it exists a common leadership style that teachers are more or less conscious of. The teachers decide on what level the classes or the pupils are andafter that decision they plan their education. The leadership in the classroom can be of different kinds depending on the situation.

HAFA Bathroom Group has given us the assignment to develop a standardized back panel for their bathroom cabinets. This cabinet is going to be applied to most of their current and future cabinet solutions. To this point, they have constructed unique suspensions-and back panels for most of their cabinet models. They have also been forced to pull wiring and assemble the cabinets differently because of factors like; position of the wall sockets, dimensions of the cabinets and their shapes.The company wants to distance themselves from their current solution, firstly because the cost of having manpower to design each individual suspension solution, secondly because they will save a lot of money when the manufacturing process requires a minimum of components to be constructed. As a result of this, the company can use their resources better to develop future products.The main idea is that the consumer isn?t required to change the suspension or back panel when they decide to buy a new cabinet.

The EU has decided that it should be possible for consumers to get information about the origin of the electricity they buy. Therefore, there is a need to examine different systems for electricity disclosure. In this thesis two ways of disclosure have been studied:? Certificate system. A certificate system involves two parallel markets, one for trading electrical energy and one for trading certificates of origin.? Separated Markets.

The purpose of this literature review was to find common factors for the persons who predispose to eating disorders. These factors shall help the nurse to recognise early signs of eating disorder behaviors. The literature review is directed to the nurse and will answer the issue: Which groups in the community run the risk of developing eating disorders? Furthermore, this knowledge shall lead to a better understanding of persons having eating disorders and be used as an aid in his/her encounter with these patients. The method was a literature review based on eight scientific articles, which were interpreted on the basis of the competence of the nurse.

There are some hazards associated with mediating dogs for adoption to Sweden from foreigncountries. Contagion is considered to be one of them, but this report focuses solely on what adoptionsmay signify to the dogs concerning animal welfare. The aim of this study is to investigate how thebusiness in Sweden is run and what this can imply to the adopted dogs. Websites of the organizationswhich perform mediation of dogs, has been examined to show which information is available. A webquestionnaire was sent to these organizations to learn more about their standard procedure.

When an organisation is going through a work of change, it is highly important that both management and employees has a healthy communication in order to make everybody feel involved. It is then important to be observant for both the managements and employees thoughts and ideas.This study has been performed on an upper secondary school which is performing a work of change. The change has divided the employees in three different groups. One, which thinks the change have evolved the organisation to something better. The second group of people means that it is preventing individual development of competence.

The construction process which is used today while constructing residential buildings has for along time remained unchanged. Unfortunately the development process has gone away frombecoming industrialized and instead most of the work is done at the construction site. In thisrespect this is a worse alternative because the project outcome will be more expensive and theconstruction time will be longer. Skanska?s vision is to have a process which is more like the oneused in small residential buildings which is fully industrialized.The constructing process for residential building involves more parties and therefore it becomesmore complicated.

Our study aimed at gaining insight of co-workers experiences of different factors that affects the verbal communication and leads to dialogue and misunderstanding between co-workers and their managers. The empirical material was gained from semi-structured interviews with co-workers at various departments within the same organization. We used a hermeneutic interpretive approach and our data was analyzed concerning different factors affecting communication. The result has been interpreted using the theories of deliberative conversations and dialogue competence. We have also used Illeris theory of learning.

The purpose of this study is to examine how outdoor education (friluftsliv) in upper secondary school is perceived by both students and teachers, and to identify the conditions that influence their motivation and commitment to participate in outdoor education activities. The study also aims to analyze the significance of students previous experiences on their perceptions of outdoor education in school. The following research questions were investigated: ? ? ? ?Which factors do students and teachers believe promote or hinder students engagement in outdoor education in upper secondary school? ? ? ? ?How do students and teachers explain the ways in which previous experiences of outdoor activities affect students engagement and motivation in outdoor education? ? ? ? ?How do students and teachers perceive that organizational conditions and teaching design influence the possibilities of creating meaningful outdoor education? The study is theoretically based on Self-Determination Theory (SDT) (Deci & Ryan, 2000) and Sense of Coherence (SOC) (Antonovsky, 1991). SDT was used to understand how autonomy, competence, and solidarity influence student?s motivation, while SOC highlights how comprehensibility, manageability, and meaningfulness shape student?s experiences of outdoor education.

Radio Frequency Identification, RFID, is a convenient way to enable contactless identification which does not require any physical nor optical contact. As with any radio-based communication the signal can be intercepted, thus making the technology vulnerable to several kinds of attacks. Interception of communication is not the only threat. Since RFID tags might contain personal information or information that will grant the owner access to secure areas, skimming and spoofing attacks are also major threats against this technology. In this thesis report,  the perspective of an adversary is portrayed in an RFID-enabled environment by presenting where RFID is used and how it could be abused.

The purpose of this report was to investigate what characterizes a good psychosocialwork environment, and whether it may have impact on a vessel's safe voyage. Thisreport is proposed to increase the understanding of what creates a good psychosocialwork environment and its potential effect on safety at sea. In order to find out thesuccess factors for a good work environment group interviews were conducted in socalledunstructured focus groups. During these conversations, the participants discussedfreely by the question "what is a good psychosocial work environment for you?? Thesuccess factors were thereafter applied on selected accident reports, to investigate theextent to which they were represented and taken into account.The results of the study show three categories of factors: colleagues, communicationand competence, where colleagues are the main contribution to a good psychosocialwork environment.

In Sweden, there are limits to how much leachable substances waste must contain in order to be deposited as hazardous waste. Fly ash from waste incineration often end up over the limit, mainly due to the chloride content. Fly ash is therefore often deposited abroad. The purpose of this study was to investigate the possibility to handle fly ash locally. To clarify how the law is applied, environmental reports and permit documents from ten waste sites with permission to deposit fly ash were studied.

How do you see on natural science within preschool? Does education and interest play a role for how the educationalist works with natural science? And is the children?s interest for natural science affected by the educationalist, what does the educationalist think himself? These questions have I under my teachers training and under deputyship in preschool asked myself and these questions lies to behalf for my investigation. I interviewed five educationalists on different preschools for my investigation.My investigation resulted in that I have been able to see a certain conjunction between how you work with natural science in preschool and the educationalist education or interest. What also plays a role is that you often associate natural science with knowledge of nature. The educationalist seems overall positive to natural science, but depending of a lack of knowledge it feels strange and difficult.

Radio Frequency Identification, RFID, is a convenient way to enable contactless identification which does not require any physical nor optical contact. As with any radio-based communication the signal can be intercepted, thus making the technology vulnerable to several kinds of attacks. Interception of communication is not the only threat. Since RFID tags might contain personal information or information that will grant the owner access to secure areas, skimming and spoofing attacks are also major threats against this technology. In this thesis report,  the perspective of an adversary is portrayed in an RFID-enabled environment by presenting where RFID is used and how it could be abused.