This is a thesis presents a differential gear which is found in a tracked vehicle called BvS10. The tracked vehicle is manufactured by BAE Systems Hägglunds AB in Örnsköldsvik, Sweden. The differential gear has a bolted house. The differential meets the requirement specifications, but the problem is that the bolts are sheared off because of the extreme torque that the differential is exposed to resist.Previous report on the differential show pictures of bolts which have been sheared off at the threads. This report is also includes three lists that explain seven different proposals which some are approved and some are not, and the report also presents the force, tensile, and shear stress.In a bolted connection there is both axial tension stress and radial shear stress, which can lead to wear out and broken bolts.

Abstract The core is the center of gravity in our body. Injuries and overload in the joints, is the most common reason for not be able to work in Sweden today. A god strength capacity in the core is important for secure and effective movements, as well for active athletes, as for non athletes. The increased number of employees, who report in sick today, has been correlated with psychological bad health. New methods to deal with mental and physical health problems among people can indicate to the fact that Yoga in the western world has increased its members, due its spiritual and physical recognition in favor of well being.

Försvarsmakten beskriver i Arméns utvecklingsplan 2010-2020 att tre dygns uthållighet på taktisknivå inte är tillräckligt utan bör vara mer flexibelt så att den även passar mindre enheter som skall kunna verka över stora avstånd utan möjlighet till egen logistik. Syftet med uppsatsen är att utreda vad trovärdig uthållighet är. Att utreda om tre dygns uthållighet på taktisk nivå är tillräckligt eller om denna bör utökas till mer än tre dygn. I uppsatsen beskrivs vad som står skrivet i olika dokument från Försvarsmakten vilka styr uthålligheten. Det beskrivs även hur Försvarsmakten avser att uthålligheten skall se ut i framtiden.

AbstractTitle: The effect of caffeine on performance during resistance training ?A systematic overviewAuthor: Amanda Jonsson and Erica BenderSupervisor: Mette AxelsenExaminer: Anna WinkvistProgramme: Dietician study programme, 180/240 ECTSType of paper: Examination paper, 15 hpDate: 2015-03-31Background: Products with high content of caffeine has in recent years become popular for optimizing physical performance. Caffeine affects mechanisms in our body which can be beneficial to perform better during exercise, but the theories have not yet been systematically reviewed.Objective: The purpose of this review article, is to examine the acute effect of caffeine intake before strength training on athletic performance with the outcome muscle endurance.Search strategy: A systematic literature search in databases PubMed, Scopus and Cochrane using keywords: ?Caffeine?, ?strength?, ?muscle?, "resistance training", "muscle strength", "strength training", "athletic performance", ?repetitions to failure?, ?muscular endurance? and ?endurance training?.Selection criteria: Healthy subjects, 16-50 years old, with experience in strength training. Studies with a caffeine intake > 5 mg/kg body weight, which participants performed dynamic strength exercises on a weight > 60% of their 1 RM.

Testosterone is a steroid and anabolic hormone found in all mammals. Previous research indicates that testosterone levels correlates with physical capacities related to physical performance. However, these studies refers only to men and boys. The aim of present study was therefore to investigate the potential relationship between body composition, strength, power and endurance capabilities in relation to blood levels of testosterone and DHEAS in young female football players. Seventeen female elite football (age: 15,4 ± 0,6, body mass: 57,2 ± 7,4kg, height 1,65 ±0,04m) players volunteered for the study.

Core strength is important in order to be able to do all types of daily activities. One way to exercise ones core muscles is according to the pre- choreographed program Fokus. Previous studies have shown that core training gives better balance and stability in the core and also improved techniques, body awareness and control. Aim: To evaluate the core endurance strength, the balance and the studied individuals self estimated body awareness and control after six weeks of training according the pre- choreographed program Fokus. Methods: A total of 14 people volunteered to participate in the study, six of which completed the study.

Core strength is important in order to be able to do all types of daily activities. One way to exercise ones core muscles is according to the pre- choreographed program Fokus. Previous studies have shown that core training gives better balance and stability in the core and also improved techniques, body awareness and control. Aim: To evaluate the core endurance strength, the balance and the studied individuals self estimated body awareness and control after six weeks of training according the pre- choreographed program Fokus. Methods: A total of 14 people volunteered to participate in the study, six of which completed the study.

Background: Running economy is one of the key factors to achieve top performance in endurance events. Little evidence exists for improving running economy using high-intensity interval training while running. Objectives: The purpose of this study was to examine how HIIT affects running economy and VO2max. Method: 14 well-trained athletes (age 35 ± 8,9 years, height 175 ± 11,7 cm and weight 69 ± 12,2 kg) were divided into two separate groups (HIIT and Control). HIIT group performed 3 HIIT exercises every week for 4 weeks and Control group continued with their separate training programs consisting of mostly traditional endurance training. Results: Running economy showed no improvement in HIIT (pre 38,62 and post 38,62 ml/kg/min, p=1.00) but Control improved (pre 45,41 and post 43,37 ml/kg/min, p=0,03). VO2max decreased in HIIT (mean 61,32 to 60,84 ml/kg/min) and in Control (mean 61,99 to 58,47 ml/kg/min)..

Background: Running economy is one of the key factors to achieve top performance in endurance events. Little evidence exists for improving running economy using high-intensity interval training while running. Objectives: The purpose of this study was to examine how HIIT affects running economy and VO2max. Method: 14 well-trained athletes (age 35 ± 8,9 years, height 175 ± 11,7 cm and weight 69 ± 12,2 kg) were divided into two separate groups (HIIT and Control). HIIT group performed 3 HIIT exercises every week for 4 weeks and Control group continued with their separate training programs consisting of mostly traditional endurance training. Results: Running economy showed no improvement in HIIT (pre 38,62 and post 38,62 ml/kg/min, p=1.00) but Control improved (pre 45,41 and post 43,37 ml/kg/min, p=0,03). VO2max decreased in HIIT (mean 61,32 to 60,84 ml/kg/min) and in Control (mean 61,99 to 58,47 ml/kg/min)..

Bandvagnen BVS-10 är ettmidjestyrt fordon och består av en fram och bakvagn.På grund av terräng kan vissa geometriska förhållanden uppstå mellan dessa vagnar,vilket leder till att inspända moment kan uppstå i drivlinan. För att jämna utdessa inspändamoment med en bibehållen drivförmåga under varierande terrängdär friktionen mellan mark och band förändras, kan en differential integreras i fördelningsväxellådan.Rimligtvis bör samma differential som sitter i slutväxlarna förrespektive vagn användas även i fördelningsväxellådan. Differentialen som sitter islutväxeln för respektive vagn är av typen TrueTrac.BVS-10 är även ett amfibiskt fordon och skall därför även kunna klättra frånsimmande läge till fast mark. För att detta skall vara möjligt med en differential ifördelningsväxellådan behöver differentialen vara låsbar så att allt drivande momentfördelas till framvagnen.Syftet med detta examensarbete är att undersöka omdet är möjligt att integreraen låsbar TrueTrac differential i fördelningsväxeln och föreslå ett eller flera konceptför detta.Examensarbetet har drivits framåt somett produktutvecklingsprojekt vilket resulteradei ett slutkoncept innehållande en lösning med ett synkroniseringsdon.För att beräkna påfrestningar på lager, axlar och kugghjul i fördelningsväxellådanskapades en modell i beräkningsprogrammet KissSys, vilket resulterade i rimligaresultat.Efter handberäkningar går det att fastslå att låsningen av differentialen inte börgöras under höga vridmoment då de krafter som krävs för detta är stora. Vid låsningstillfälletsom för övrigt varar under en kort tid bör istället ett lägre momentkrävas.Slutkonceptet är designat för testning och inte tillverkning, vilket betyder attförslag på bearbetning av nuvarande komponenter har gjorts och att antalet nyakomponenter har försökts att hållas nere.Det går att konstatera att en låsbar differential av typen TrueTrac går att implementerai fördelningsväxellådan men utrymmet är begränsat.

Crossfit is a recently developed form of training which is based on a number of functional resistance exercises performed at high intensity, often to the point of muscular failure. Crossfit has since its introduction 30 years ago, reached vast popularity all around the world, including Sweden. Its practitioners considers Crossfit to be an effective training method for achieving a functional and total trained physique thru improvements in VO2max, muscle strength, endurance, balance and speed. Few scientific studies has been published in the subject which is why this study sets out to examine the effect of Crossfit on VO2max (measured with Åstrands submaximal cyclingtest), maximal strength capacity in lower- and upper body muscles (measured with 1 RM tests in bench press and leg press), rapid strength capacity and strength endurance capacity in upper body muscles (measured with push-up test in 30 seconds) and explosive strength capacity in lower body muscles (measured with sergeant jump test). Five women with an average of 33(±5) years of age all new to Crossfit, performed these tests at two separate occasions with a training period of four weeks consisting of 12(±3,67) Crossfit sessions in between.The result showed a significant improvement in the maximal strength capacity of the leg extension muscles (p=0,025).

In several scientific and technical educations today we meet mathematical studies in differential- and integral calculus. The classic mechanics is a foundation for the physics and it has made it possible for today's technical developments that we in our everyday life meet and make use of. The intention for this essay is to give a picture of the person behind this discoveries that changed the science and the world. Besides the purpose to bring the reader on a journey through Isaac Newton's life the main intention is to give an understanding of the way he discovered the binomial theorem, the differential- and integral calculus, the numerical methods Newton-Raphson's and Newton's interpolation-polynomial, Newtons identities and his classification of third-degree curves and elliptic curves. A derivation of Kepler's first law is also included..

Flow measurement is one of the greatest challenges in order to calculate efficiency in hydropower. Most hydropower plants in Sweden use differential pressure methods for flow measurement. These methods are dependent on constant conditions in the waterways. A change in these conditions, like turbine improvements, prevents differential pressure methods to verify efficiency improvements. Since efficiency improvements can?t be verified by one measurement system, another method, which isn?t affected by changing conditions, can be used.

As the 2010 Swedish election was closing in, there was a discussion about how the media represented the different party leaders in a differential and unfair manner. This study aims to identify if there were any differences in how four of these party leaders, Lars Ohly, Maud Olofsson, Fredrik Reinfeldt and Mona Sahlin were treated in four individual questioning sessions on Swedish television. Utilizing conversation analysis the study focuses on identifying differences in the usage of interruptions between the four different sessions. The study also analyzes the aggressiveness of the journalists? questioning and how they designed their questions in the four different sessions.

ABSTRACTBackground: On behalf of the Orthopedic clinic, Västerås, a study has been conducted with focus on comparing the results after conservative and surgical treatment due to complete achillestendon rupture.Aim: To compare results when testing the active and passive range of motion, calf muscle endurance, estimation of pain related to the achillestendon and self-efficacy to be physically active for individuals who have undergone conservative or surgical treatment after complete achillestendon rupture.Method: 14 individuals afflicted by complete achillestendon rupture in 2010 were recruited as a purposive sample. Examination were conducted of: Ankle range of motion with a goniometer, calf muscle endurance through a toe-raise test, estimation of pain intensity related to the achillestendon by VAS and self-efficacy to be physically active through ?Exercise self-efficacy scale?. P-value and the median were calculated.Result: The results of ankle range of motion and calf muscle endurance were based on the difference between the injured and the healthy side. When testing active plantarflexion the conservative group had a median of 4 ? and the surgical group had a median of 10 ?.