Denna uppsats handlar om konsten att uppöva förmåga till improvisation på orgel. Den tar upp frågor kring hur de s.k. musikaliska parametrarna spelar in vid improvisation, vilken plats improvisationen kan ha vid en gudstjänst samt hur jag gick tillväga för att uppöva en förmåga till Preludium innehållande trio och fuga. Det bestod i en klar kombination av teori via litteratur och föreläsning samt praktik med eget övande och analyserande. Reslutaten visar att det går att uppöva ändamålsenlig förmåga till improviserat spel på orgel, att det de musikaliska parametrarna spelar en central roll samt att gudstjänsten erbjudet tillfällen för organisten att improvisera.

More and more people are using the internet for data processing, transfer, and storage. With it comes a higher demand for computational power from data servers. Unsurprisingly, the data center industry is becoming an increasingly large industry that is important for people’s daily lives. Data centers cover 2 % of the world’s total electrical consumption and this number is expected to become higher. Running data centers with optimal performance while operating efficiently and as sustainably as possible is a task that is of utmost importance.The way data centers are cooled today is through a CRAH unit that features cooling coils and a fan, the fan blows air over cold coils to prevent damage to server components. Another task for this fan is to create a high differential pressure over the servers using this air, to ensure the air flows in the right direction. The air is uniformly distributed over the servers. With dynamic air-handling measures, it is possible to match the cooling for individual servers, because all servers have different workloads. They generate different amounts of heat. This thesis investigates manual redistribution between servers and how an air-handling damper unit, that sits on the server, is designed to investigate how it can reduce total power draw. Different tests are run in a wind tunnel which houses room for six servers whereas three prototypes are mounted on three of the servers. The main idea to test is that instead of running an even amount of stress on six servers, the same amount of stress is redistributed on only three servers. The ones now running idle have a damper unit blocking the server's rear side. That way the CRAH fan is using less power to create the same differential pressure. Also, the total power draw to all servers is reduced as well. One of the tests was the conventional way of cooling servers today and it had a total power draw of 1362 watts. The test with both redistribution, dampers closed at the rear and turned off servers had a power draw of 951 watts. That is a 30% decrease.

The Swedish Institute of Space Physics (IRF) at Kiruna focuses on research activities in the ionosphere, magnetosphere, and upper atmosphere of the planet as well as the development and production of various sensors and detectors for space research. The test facility includes the IRF SpaceLab which is equipped with multiple testing equipment. One of the testing resources available is the Solar Simulator, which consists of a vacuum chamber equipped with four metal halide lamps that produce a spectrum closely resembling that of the Sun. When any spacecraft payload or instrument is exposed to the Sun and its radiations, the most important factors to consider are the type of radiation, flux, and how the exposed material will react. Thermal designing and solar balance tests are important factors in achieving expected conditions for different missions. By testing and verifying these lamps, this solar simulator can be used not only for IRF missions but also for other institutes and private organizations that can access it. The characterization of four lamps is done in terms of temperature distribution, radiation, and power. According to preliminary experimental measured values obtained from the setup, exposed material, and its properties can be varied and the best suitable coating can be selected that includes α (absorptivity) and ϵ (emissivity) valueconsideration. The thesis is divided into four phases: Designing, Manufacturing, Testing, and Analyzing. Before entering into these phases, the basic knowledge of thermal engineering and thermal simulation is acquired. Thermal modeling and simulations are done in Airbus Defence & Space’s Systema Thermica software tool. The design phase includes designing a frame structure and a 350 x 350 mm screen in Autodesk Inventor software. Manufacturing of the frame structure and the screen was done in the IRF workshop. This screen kept hanging with the support of a frame structure which is mounted on the copper table inside the chamber. The screen is kept in the field of view of each lamp and every lamp is illuminated accordingly. The analysis is done by measuring the temperature of the back side of the screen. Temperature sensors were mounted and clamped mechanically instead of kapton tape to avoid direct contact with the screen. The obtained values are analyzed and compared with the thermally simulated values. Pressure and the temperature of the system were monitored with independent systems throughout the test procedure. This thesis report could operate as a foundation for future examination of the solar simulator’s lamps in order to determine precise efficiency.

In this master’s thesis, a sound-based notation system is explored and developed in the composition and performance of a musical work for live electronics. My approach builds on existing systems for electroacoustic music analysis, most notably Dennis Smalley’s (1997) theory of spectromorphology and the symbolic language of Lasse Thoresen & Andreas Hedman (2007) based on Pierre Schaeffer’s typo-morphology, as well as Mattias Sköld’s (2023) adaptation of this system for composition and transcription (Sound Notation). 

By separating the compositional processes from the interpretational process in the creation of a mixed work for live electronics and acoustic instruments, the notation could be explored as an isolated activity in the writing of sound objects, later realized in a studio environment in the form playable instrument patches. This resulted in two performances of the piece Sonic Mechanics (2022) where the author performed the electronics part together with musicians from the ensembles Norrbotten NEO in Piteå (Sweden) and Ensemble mise-en in NYC (USA). 

The thesis shows how symbolic notation does not need to be dismissed in live electronic performance, but that a sound-based score can complement the compositional and interpretational processes of instrument design and improvisation. The project thus demonstrates the plausibility of composing electronic music using a reduced sound- based notation system (spectromorphological reduction) and provides an example of how a sound-based score can be executed by an electronic performer, as well as investigating the affordances that this approach has for both the compositional and interpretational process. For composition, the affordances of sound-based notation are that it becomes a technology for thinking about sound and musical structures themselves, without interaction with audio technology. For performance, this approach enables different interpretations for other electronic instruments and setups. 

Bakgrund: Återinskrivning till sjukhus är vanligt förekommande och definieras som vårdtillfälle där återinskrivning sker inom 30 dagar från det tidigare vårdtillfället. Det finns olika orsaker till återinskrivning men två betydande faktorer är bristande vårdkoordination och uppföljningsvård. Samverkan vid utskrivning är en betydande faktor för att personen ska känna sig trygg vid hemgång och på så sätt undvika återinskrivning. Syfte: Att beskriva personers upplevelse av återinskrivning till sjukhus. Metod: Litteratursökningar gjordes i databaserna CINAHL och PubMed, elva vetenskapliga artiklar valdes ut och analyserades med innehållsanalys utifrån en kvalitativ design med induktiv ansats. Resultat: Analysen resulterade i fem kategorier som beskriver personers upplevelse av återinskrivning till sjukhus: Att tvingas genomgå ett nytt vårdtillfälle, Att känna sig missnöjd under sjukhusvistelsen, Att känna tillfredsställelse vid återinskrivning, Att känna blandade känslor vid utskrivning och Att vilja klara sig själv men behöva stöd från andra. Slutsats: Det framkom att vissa personer upplevde generellt en mer accepterande attityd till återinskrivning, medan andra personer upplevde känslor som frustration och lidande vid återinskrivning. För att undvika återinskrivning har sjuksköterskor en viktig roll i att förbereda patienter inför utskrivning och samverka med andra vårdaktörer inom hälso-och sjukvården för en personcentrerad hemgångsplanering.

VR gaming is an emerging market with relatively new technology when compared to PC and console gaming. Streamed VR gaming is when the VR game is being streamed from another device to the VR headset. This experiment will show how the VR hardware and software performs under network constraints such as RTT and packet loss for streamed VR gaming specifically. User QoE (quality of experience) will be gathered and compiled into MOS (mean opinion score) for later use in graphs to determine negative trends. All collected data will also be sent to the Infovista technical team so they can make theoretical models on how user QoE is affected by network conditions. This thesis will show how the QoS (quality of service) factors, such as latency and packet loss, impact the users overall QoE and the VR headsets FPS.

Before the subjective experiment could begin a testbed was chosen and setup, a VR game was decided on, and a streaming service was tested on. During the experiment the game Serious Sam VR: The Last Hope was played and NVIDIA’s CloudXR streaming service was used. The testbed setup consisted of two PCs, one router, one access point, a tablet used for user reviews, and a VR headset with two handheld controllers. The software program ALTRUIST was used for managing the user data and applying the desired network conditions such as latency. Each user experiment tested 28 different network conditions with varying values of RTT (round trip time), Packet loss, RTT with packet loss, and RTT with random jitter. 30 users were gathered for the actual experiment where the Calendly application was used to manage the user appointments.

The results consisted of objective and subjective data gathered during the experiments. From the objective data it could be determined that RTT primarily affects the FPS in the VR headset. Packet loss affected the FPS but to a minor degree compared to RTT. RTT of 175 ms received an average FPS of 53 while 24% packet loss yielded approximately 65 FPS. Random jitter had close to no impact on the FPS according to the results. The subjective data suggests that RTT of 75 ms and below yields a good user MOS and RTT of 175 ms gives an acceptable user MOS at 3 out of 5. Packet loss of 6% and below gives a good user MOS while 12% and above results in poor MOS. RTT with random jitter performs average to poorly with Standard deviation of 3 and above, for low RTT values. For future experiments it is advisableto use ALTRUIST or a similar software to help the researcher during the experiment.

Inledning: Världen förändrades när covid-19 pandemin bröt ut. På bara några dagar förändrades sjukvården drastiskt med nya arbetssätt och rutiner som sjukvårdspersonal behövde anpassa sig till. Diagnostisering med hjälp av röntgenundersökningar spelade en stor roll i vården av patienter med covid-19. Det innebar att röntgensjuksköterskor fick ställa om sitt arbetssätt och fick mer akuta patienter som behövde genomgå röntgenundersökningar. Syfte: Syftet med studien var att beskriva röntgensjuksköterskors upplevelser av att arbeta under covid-19 pandemin. Metod: Författarna har gjort en litteraturstudie med kvalitativ innehållsanalys. Nio artiklar analyserades med manifest ansats. Resultat: Litteraturstudien visade att röntgensjuksköterskor kände rädsla och oro över viruset. De upplevde frustration och maktlöshet gällande otydliga instruktioner om skyddsutrustning och arbetsrutiner, samt att de inte kunde utföra en personcentrerad vård. Ökad arbetsbelastning medförde att röntgensjuksköterskor beordrades längre arbetspass. Till följd av detta upplevde flera röntgensjuksköterskor stress och ångest. Röntgensjuksköterskor upplevde att de inte ansågs vara en del av frontlinjen, trots att de dagligen hade ett patientnära arbete med covidsjuka patienter. Slutsats: Röntgensjuksköterskorna har haft en viktig del i diagnostiseringen av covidsjuka patienter. Olika faktorer har gemensamt påverkat röntgensjuksköterskors upplevelser av sin arbetssituation under pandemin. För att värna om röntgensjuksköterskans arbetsförhållanden inför framtida pandemier bör en bättre beredskap implementeras.