Considering teacher talk as the main input into the English as a foreign language classroom, this study aims to highlight and gain a deeper understanding of how target language use can look like in a foreign language classroom in Sweden. To investigate in this essay, the following research questions are addressed: • What is the teachers´ attitude towards the use of the target language in English teaching? • To what extent does the teacher communicate orally in English during English lessons? And on what occasions does the teacher choose to use the target language andthe first language during English lessons? The study was conducted in four different elementary schools, and four teachers were observed who taught in different grades. An interview was held after every observation, and through the interviews a deeper understanding was obtained. The material consists of notes through observation schedules and recordings of interviews and recording of observation. The study is based on Krashen's (1981) input hypothesis as well as Vygotskijs (2001) notion of Zone of proximal development. Research indicates that using the target language consistently can create learning opportunities for students, and a relaxing environment for them to use the target language themselves fluently during English lessons. Furthermore, studies has alsoshown using the first language can affect the students own language production and learning of the target language. However, other have shown that in some cases it can be an advantage to use the first language to include all students during English lessons, especially for the weak students in the class. Therefore, taking into consideration these different perspectives, I investigate four teachers´ use of English and Swedish in the Swedish EFL classroom.The findings show that three out of the four teachers observed used the target language in the beginning of the English lesson, while giving instructions, commanding the students to use the target language and asking them questions however, only one of them used the target language consistently during the English lesson. The findings also shows that the teachers used the first language to facilitate the students´ comprehension and to translate when they didn’t seem to understand what was said in English. Notably, some of the participating teachers indicated a desire to use the target language to a larger extent during English lessons, but they felt obligated to use Swedish in order to include all the students. The overall 3conclusion of this study is that it can be beneficial for both teachers and students if the teacher is aware of their approach toward the target language. They can thereby reflect on the impact this can have on their students´ language learning, their English lessons and their students´ use of the target language.

In 2018, the shipping industry accounted for 2.89% of worldwide greenhouse gas (GHG) emissions, with carbon dioxide (CO2) being the most significant GHG affecting global warming (IMO, 2020). This research aims to introduce a method for selecting propellers at the early design stage to lower CO2 emissions from ships.Traditionally, propeller design assumes that a ship travels in a straight line at a constant speed. However, real-sea conditions involve environmental forces and ship maneuvering, requiring frequent adjustments in speed and direction. These adjustments affect the flow angle and velocity at the propeller, causing it to operate outside its design point and, as a result, reducing its efficiency.To tackle this issue, a MATLAB-based simulation program was developed. Which predicts ship maneuvering motions in 4 degrees of freedom (DOF)—surge, sway, yaw, and roll—using the MMG model. The program applies wave and wind forces, calculates ship motion responses in each iteration, and employs two controllers to manage the rudder and propeller speed, ensuring the ship stays on course and arrives on time.The optimization process is iterative, using simulation outcomes to determine propeller speed, thrust, drift angle, etc., and then selecting an optimized propeller with the program's optimization tool that is more adequate for the operational condition.Building on Trodden's (2014) work, this approach improves maneuvering simulations' accuracy by incorporating ship rolling motion, more realistic wave modeling, and more accurate hydrodynamic coefficients. This offers a closer representation of operational conditions.Case studies comparing this method with the traditional approach to propeller selection have shown the simulation program's precision and its effectiveness in improving propeller open water efficiency by 1.65% and reducing CO2 emissions by 1.47% for a Pure Car Carrier (PCC) ship. The results of the research showed a promising potential for the program to predict ship maneuvering motions in real-sea conditions and optimize the propeller. / År 2018 stod sjöfartsindustrin för 2,89 % av de globala utsläppen av växthusgaser (GHG), där koldioxid (CO2) är den mest betydande växthusgasen som påverkar den globala uppvärmningen (IMO, 2020). Denna forskning syftar till att introducera en metod för val av propellrar i det tidiga designskedet för att sänka CO2-utsläppen från fartyg.Traditionellt antar propellerdesignen att ett fartyg reser i rakt linje med konstant hastighet. Men verkliga sjöförhållanden involverar miljöpåverkan och fartygsmanövreringar, vilket kräver frekventa justeringar av hastighet och riktning. Dessa justeringar påverkar flödesvinkeln och hastigheten vid propellern, vilket gör att den opererar utanför sin designpunkt och som ett resultat minskar dess effektivitet. För att ta itu med denna fråga utvecklades ett MATLAB-baserat simuleringsprogram. Programmet förutsäger fartygsmanövreringsrörelser i 4 frihetsgrader (DOF) - surge, sway, yaw och roll - med användning av MMG-modellen. Programmet tillämpar våg- och vindkrafter, beräknar fartygsrörelsesvar i varje iteration och använder två kontrollanter för att hantera rodret och propellerhastigheten, vilket säkerställer att fartyget håller kursen och ankommer i tid.Optimeringsprocessen är iterativ, använder simuleringsresultat för att bestämma propellerhastighet, dragkraft, drifvinkel osv., och väljer sedan en optimerad propeller med programmets optimeringsverktyg som är mer lämplig för driftsförhållandet. Genom att bygga vidare på Troddens (2014) arbete förbättrar denna metod noggrannheten i manövreringssimuleringar genom att inkludera fartygets rullningsrörelse, mer realistisk vågmodellering och mer exakta hydrodynamiska koefficienter. Detta erbjuder en närmare representation av driftsförhållanden.Fallstudier som jämför denna metod med det traditionella tillvägagångssättet för val av propeller har visat simuleringsprogrammets precision och dess effektivitet i att förbättra propellerns öppenvatteneffektivitet med 1,65 % och minska CO2-utsläppen med 1,47 % för ett Pure Car Carrier (PCC) -fartyg. Forskningens resultat visade en lovande potential för programmet att förutsäga fartygsmanövreringsrörelser under verkliga sjöförhållanden och optimera propellern.