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745 Uppsatser om Ground fault - Sida 4 av 50
Hänsyn till mark och vatten vid slutavverkning : en fältstudie på känsliga marker
The purpose of this study is to investigate if there is enough consideration taken to sensitive forest areas close to water or wetlands during clear cutting assignments, and to estimate the extent of damage made by forestry machines used at that time. A field and literature study is used to show how to improve and prevent the damage made in the wake of the machines.
This study is made for Sydved, and shall culminate in a policy to prevent ground damage during their clear cutting assignments.
The areas which were part of the field studies were clearcuttings on fine grained soil close to water and wetlands. The purpose was to find out if the water had been affected, what had been done to prevent ground damages and what more could have been done.
The results of the field studies show that more work needs to be done to reach up to expectations. More information about the assignment area, better planning of sensitive regions, and strengthening of the main haul roads with brush are some of the improvements that can be done. There is also a need for more exact guidelines, follow-ups and education for everyone involved to have the same goals and understanding to prevent ground damage..
Kommunikation i Designer- Klientinteraktionen : Användning av objekt för att uppdatera Common Ground
En designers främsta uppgift är att hitta lösningar på problem som är svårformulerade vilket kräver full förståelse för designsituationen. Interaktionsdesignern fungerar dessutom som länk mellan olika aktörer i en beställarprocess med syfte att tillgodose slutanvändarens behov, som ofta faller mellan stolarna. Avsikten med denna rapport är att studera hur interaktionsdesignern kan vara den kommunikatör som krävs. Detta har gjorts genom att titta på hur objekt används i kommunikationen mellan designern och dess klient. Studien är gjord genom en videoanalys som tolkats utifrån Herbert H.
Uttorkning av lera : Orsaker och följder
When building a house or similar the stress on the ground increases and deformations can arise. The deformations create a foundation that the building is not constructed for and damages on the building arise. The increased stress on the ground can be derived back to the building, but it is possible that the increased stress may well derive from different sources such as other buildings or trees. The building is an older property, built in the late 19th century alternatively early 20th century, and is today used for rental housing and has suffered severe damages due to subsidence. The goal of the thesis is to find possible causes for these subsidences. The thesis was executed as a combination between literature- and casestudie. After careful studies it has been found that a probable cause for these subsidences is trees. Through field- and lab studies it has been found that the trees has effected the ground through there accumulation of water.
Slaget om Breitenfeld : En analys med hjälp av de grundläggande förmågorna, marktaktiska grundprinciperna och ledningsfilosofin uppdragstaktik
The Battle of Breitenfeld took place in 1631, during the 30-year war. It was the biggest battle the Swedish army has participated in. The essay analyses the battle from a Swedish-Saxon perspective, using the basic skills, ground tactical principles and management philosophy of decentralized command.The essay is based on a case study stemming from a qualitative text analysis, and is as such divided into three parts. The first part of the essay describes my theory, and explains what the different terms stand for. The second part narrates the battle and the participating armies.
Förhandling vid tomträttsavgäldsreglering av kommersiella tomträtter - Med fokus på beräkningsmodell för avgäldsunderlag
The objective of a site leasehold is to allow the lessee to occupy a specific plot of land. In return, the lessor imposes an annual ground rent. The ground rent ownership gives the lessor the possibility to capture the increasing in land value. As such, the rent is based on the value of the land multiplied with a percentage that reflects the yield of the land value. It is renegotiated every ten years.
Röjning på snö och röjning på barmark : effekter på produktivitet och kvarvarande bestånd
Approximately 4000-5000 hectares, of SCA´s forest land area in Västerbotten, are in need of pre-commercial thinning (PCT) every year. Within the management district, the areas annually treated with PCT must increase, in order to decrease the area with an urgent need for PCT. This can be done by employing more forest workers or entrepreneurs, by mechanized PCT or by an extended season for PCT. Positive experiences from a private forest owner, who started to carry out PCT when the first snow came and then continued for several months, gave an idea to investigate the possibilities to prolong the season of PCT.
The purpose of this experiment was to compare PCT carried out when there was snow on the ground with PCT performed when there was no snow on the ground.
Förbränning av pellets framställda av defibrerad granråvara :
Fuel pellets are in Sweden mainly produced from sawdust and cutter shavings. Before the pelletising process the raw material is dried to attain consistent moisture content and ground up in a hammer mill. In the densification process (pelletising) the ground material is forced through holes in a rotating die. This heats up the wood particles which cause them to soften and self bond. After the process the pellets are cooled, sieved and bagged.
The milling process creates a wide range of particle sizes.
The effects of Gotland pony grazing on forest composition and structure in Lojsta hed, south eastern Sweden
Livestock animals affect their environment in a number of different ways, mostly through grazing and trampling. This study focused on the effects of Gotland pony grazing on forest structure and diversity, and the impact on ground cover. To compare the fenced and grazed area with a reference area outside the enclosure a number of transects were used. The study showed that there was no significant difference in height structure and diversity between the compared sites; however, there were a significantly higher proportion of damaged trees inside the enclosure. The ground cover variables showed a higher amount of bare soil, plant litter and wood-rush (Luzula sp.) inside the enclosure whilst grass was more frequent in the reference area.
Jordlöparfaunan i bestånd av contortatall (Pinus contorta) och svensk tall (P. sylvestris) 1987 och 2010
In the 1970´s the North American lodgepole pine (Pinus contorta) was introduced to Sweden in large scale. The lodgepole pine affects its new environment different from Scots pine (P. sylvestris), leading to a change in biological diversity.
Forestry today affects the ground beetle fauna (Carabidae). Habitat specialists associated with older forests are first affected. When the canopy closes again after a clear-cutting species that prefer open habitats reduces and those who prefer mature/closed forests increase.
In this study we compare differences in diversity and community structure of ground beetles in stands of lodgepole pine and Scots pine.
Sand pits as habitat for ground beetles (Carabidae) : does the area affect species number and composition?
Sand pits are a valuable habitat which can hold many sand living species including several endangered ones. As many sand habitats with exposed sand are declining, sand pits have a potential as a substitute habitat. This study was conducted to see what effect the area of a sand pit has on species number and composition of ground beetles (Coleoptera: Carabidae). Also, the effects of other environmental variables were tested, for example the proportion open sand, vegetation cover, sun exposure and tree cover. The study was conducted in the county of Uppsala in 2008 and included 13 sand pits with areas between 200 and 180,000 m2.
Tillförlitlighet i Stockholms elnät : En analys med hjälp av Tekla NIS
Outages in the electric grid can be costly for society. Because of this, reliability is one of the parameters used to regulate network companies. Reliability in electrical grids can be measured with SAIDI, system average interruption duration index, which for Fortum Distribution has increased in Stockholm?s distribution network (11 kV) in the early 2000?s.By using outage data for Stockholm from 2011-2013, sets of parameters to be used for reliability calculations in the network information program Tekla NIS were derived. Two different options for investment were then analysed: changing old cables with high fault frequencies, and installing automatic switching in distribution substations.
Ny stamstation i Yttermalung för anslutning av vindkraft : Nätstudie av olika utföranden i normal- och reservdrift
Since 2004, wind power has had the largest installation of new capacity compared to other energy sources in Sweden. Accommodating new wind power may require strengthening or rebuilding of the existing grid in areas where the grid is already loaded to maximum capacity. This master thesis examine the possibility of a new 400/130 kV substation in Yttermalung, Sweden, with a connection to the two neighboring regional grids in Dalarna and Värmland owned by Fortum. This substation would provide a new connection point to the Swedish transmission system as well as an interconnection of the two, currently separated, regional grids. Different expansion scenarios where a substation with and without series compensation or a phase shifting transformer (PST) to control active power flow were studied.
Social Construction of Crisis: The Constructed Realities of SAS Ground Service Employees Regarding the Preparatory Period of Strategy 2011 Organizational Development Program.
The thesis explores an ongoing dialectical process between different levels of employees including top management to workers of Scandinavian Airline Service (SAS) regarding a new change program and to find out the possible social construction among them. In particular, it searches for the constructed reality of SAS ground service employees at Malmö Airport with regard to the preparatory stage of SAS Strategy 2011. A possible ambiguity in dialectical process is explored as it relates to an organization?s ability to effectively influence the understanding and identity of its employees through discourse.
Framtidens begravningsplatser : en historisk tillbakablick, dagssituationen och visioner för framtidens gestaltningsuttryck
The purpose of this article is partly to find out how
the burial grounds are used today and the needs of its
visitors, but also to develop the character and
expression of future burial grounds. My suggestions
focus on burial grounds without religious attributes;
something that, according to the burial law
(Begravningslagen, 1990:1144), the manager of the
burial ground is ordered to obey. In my design I aim to
fulfill any requests regarding the place of burial that
have been raised during my study.
I have chosen the history of burial grounds as my
starting point and will subsequently discuss their
significance in today's society. I describe what
distinguishes the burial ground throughout history
from medieval times and onwards. Tradition and
religion are closely linked regarding burial rituals.
Stålfiberarmerad betong för platta på mark : -En kostnads- och sprickbreddsanalys
AbstractToday there is an opportunity to reinforce concrete with steel fiber reinforcement. In some cases, completely replace the conventional reinforcement. Replacing conventional mesh reinforcement with steel fiber reinforcement in slabs on ground has shown economic benefits, less crack width and less reinforcement amount.Today there are no Swedish standard for designing steel fiber reinforced concrete, what is there is different international recommendations.In this work, design methods for steel fiber concrete are used according to RILEM and Bekaer Swedish AB's software DRAPRO. For other design methods Eurokod 2 is followed.In this work, the design of slabs on ground that are not exposed by large tension strength been designed. Design of crack-reinforcement and restrictions of crack width have been conducted in three different slabs on ground.The calculations have been performed using only conventional reinforcement and only steel fiber reinforcement, and the results are then compared.The results of the theoretical analysis are summarized in tables that compare the amount of reinforcement, crack width and economic cost.This work showed that the slabs on the ground reinforced with steel fibers provide less crack width with a minor amount of reinforcement.