Introduction: Very few studies have looked at the effect of vibration on flexibility, and no studies exist that have looked at stretching concurrently with whole body vibration (WBV) training. Therefore, the purpose of this study was to determine if whole-body-vibration training (WBV) done concurrently with static stretch (SV) is more effective than static stretching alone (SS), and to see if WBV training independently (SQ) improves hamstring flexibility without stretching. A secondary purpose of this study is to determine if retention of flexibility gains are maintained. Methods: Forty-four subjects (31 men, 13 women) completed this study (age 22.5 ± 1.8 years; body mass 75.54 ± 13.18 kg; height 176.7 ± 8.06 kg). All subjects were randomly assigned to 1 of 5 groups: SV group (8 males, 3 females), SQ group (8 m, 4 f), SS group (8 m, 3 f), and the C group (7 m, 3 f). All subjects were measured bilaterally for hamstring flexibility using the lying passive knee extension test (LPKE) prior to group assignment. Subjects from each treatment group reported to lab 5 times per week for treatment. Subjects stood on the WBV platform for 5 repetitions of 30-seconds at with 30-seconds in between bouts. The SV group stretched hamstrings while standing on the WBV during the vibration bouts (at 26 Hz and 4 mm amplitude). The SS group did the same thing except the unit was not turned on. The SQ group stood on the WBV platform in a semi-squat position similar to most WBV training studies, without stretching, but with vibration. The C group stood on the WBV platform in a semi-squat without vibration. Analysis and Results: A mixed models analysis of covariance (ANCOVA) was used while blocking on subjects to analyze data using the statistical program SAS (version 9.1). A Bonferroni correction was used for significance on all post hoc tests (p<.0001). At baseline there were no significant differences between groups for flexibility (see Table 1), showing that each group was similar in flexibility to start. Throughout the treatment period (3 weeks of stretching) both the SS and SV groups had significant increases in flexibility compared to SQ and C. Analysis of the slopes (rate of change) for the treatment period was significantly different between the SV group and all other groups (p<.0001 for all comparisons), showing that the SV group had a greater rate of change than all other groups. For the retention period there was no significant difference between the SV and SS group (p=0.0455), but there was a significant difference between both the SV and SS groups and all other groups (p<.0001 for all comparisons). Conclusion: Stretching during WBV improves flexibility more than static stretching alone and at a faster rate. WBV on its own without stretching does not significantly improve hamstring flexibility.

This thesis presents Web Utility Kit (WUT): a platform that helps to simplify the process of creating modern web applications. It addresses the need to simplify the web development process through the creation of a hosted service that provides access to a unified set of resources. The resources are made available through a variety of protocols and formats to help simplify their consumption. It also provides a uniform model across all of its resources making multi-resource development an easier and more familiar task. WUT saves the time and cost associated with deployment, maintenance, and hosting of the hardware and software in which resources depend. It has a relatively low overhead averaging 123 ms per request and has been shown capable of linear scaling with each application server capable of handling 120+ requests per minute. This important property of being able to seamlessly scale to developer's needs helps to eliminate the expensive scaling process. Initial users of the platform have found it to be extremely easy to use and have paved the way for future developments.

This study examines how systems development operations manage the Software Development Life Cycle (SDLC) in a Low-Code Platform (LCP) and how these descriptions relate to today's SDLC standards. To investigate this, a case study for a specific LCP has been made. Semi-structured interviews have been carried out with the aim of investigating theSDLC managed in the investigated LCP. An analysis model based on ISO/IEC/IEEE12207:2017 has been used for a deductive thematic analysis. The analysis shows a great breadth regarding how system development operations can integrate an LCP into their IT infrastructure and work with it. The choice of strategy will control how the system development operation works with the SDLC for IT artifacts that are developed in theplatform. In order for the organization to be able to enjoy the benefits of the LCP, business processes need to be possible to model in the platform. Complex and extensive business rulesaffect the possibilities to model business logic through low-code in the platform. Addressing this through traditional code can increase the complexity of certain elements of the SDLC and the need for expertise, which can significantly increase resource requirements and the time required for the system development process. / Denna studie undersöker hur systemutvecklings-verksamheter hanterar SoftwareDevelopment Life Cycle (SDLC) i en Low-Code Platform (LCP) och hur dessa beskrivningarrelaterar till dagens standarder för SDLC. För att undersöka detta har en fallstudie för enspecifik LCP genomförts. Semistrukturerade intervjuer har utförts i syfte att undersöka hurolika projekt hanterat SDLC i den undersökta LCP:en. En analysmodell baserad påISO/IEC/IEEE 12207:2017 har använts för en deduktiv tematisk analys. Analysen visar på enstor bredd gällande hur systemutvecklings-verksamheter kan integrera en LCP i sinIT-infrastruktur och arbeta med denna. Valet av strategi kommer styra hursystemutvecklings-verksamheten arbetar med SDLC för IT-artefakter som utvecklas iplattformen. För att organisationen ska kunna åtnjuta fördelarna med LCP:en behöveraffärsprocesser vara möjliga att modellera i plattformen. Komplexa och omfattandeaffärsregler påverkar möjligheterna att modellera affärslogik genom low-code i plattformen.Att åtgärda detta genom traditionell kod kan öka komplexiteten i vissa moment i SDLC ochpåverka behovet av kompetens vilket avsevärt kan öka resurskrav och tidsåtgången försystemutvecklingsprocessen.

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This work presents a preliminary design of a liquid rocket engine test platform to support research into liquid propulsion systems and rocket engine components, including injectors, ignition systems, combustion chambers and engine cooling systems. The liquid propellants, specifically liquid oxygen and ethanol, are pressure-fed using gaseous nitrogen. The test platform supports engine thrust values up to 1 kN, as well as varying oxidizer/fuel ratios up to 4.0 and varying ethanol concentrations between 70 and 100%. The test platform will integrate with a mobile control centre, which was designed concurrently, and provides remote control of the test procedures and data acquisition of all relevant pressure, temperature, mass flow and thrust data. The propellant feed assembly can support both cold and hot fire testing campaigns and is equipped with numerous safety features including inert gas purge lines, emergency drain lines and emergency shut-down and de-pressurization procedures.