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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

IAS Water project in Sudan

Johansson, Samuel January 2007 (has links)
<p>Northern Bahr el Ghazal area in southwestern part of Sudan was severely affected by the civil wars in Sudan. This has led to lacks of development in most areas, not least water supply. In combination with a high number of refugees returning to the area the water situation is very difficult.</p><p>This study is made to investigate how the water project of International Aid Services (IAS) is working. First I wanted to get a good image of the different areas connected to the IAS water project such as community mobilization, drilling and water source and sanitation education.</p><p>At the time of my studies the Community Mobilization Unit (CMU) had just began their work, therefore the system with Water Source and Sanitation Committees had not yet been really implemented. However, some had been formed but not trained.</p><p>The drilling is performed using two different methods, Mud Rotary and Air Flush. Mud Rotary is used in clay soil and Air Flush is used in more rocky soil.</p><p>One of the main problem issues is transport, mainly transport of drilling machines, well material and water used during drilling. Problems in the means of transport are the terrible conditions of the roads which also lead to terrible conditions of the vehicles, especially the heavy vehicles which are very old.</p><p>Another main problem is supplies, especially supplies of spares for the vehicles and equipment but also food and other essentials. Many things have to be brought from other countries via Khartoum and then by lorry to Northern Bahr el Ghazal.</p><p>One of my conclusions is that much weight must be put on the county community mobilization to really involve the local people in the project so that they feel responsible for the well after it has been handed over. This is crucial to get full impact of the project.</p><p>Another conclusion is that if supplies could be handled through Southern Sudan (Juba) it could cut down transport time and costs. But this cannot be realized yet since the range of things in Juba is rather limited compared to Khartoum.</p><p>Finally I believe that the personnel must be very observant for coming breakdowns and report this immediately to enable ordering spares, etc. as soon as possible and minimize the time standing still.</p>
2

IAS Water project in Sudan

Johansson, Samuel January 2007 (has links)
Northern Bahr el Ghazal area in southwestern part of Sudan was severely affected by the civil wars in Sudan. This has led to lacks of development in most areas, not least water supply. In combination with a high number of refugees returning to the area the water situation is very difficult. This study is made to investigate how the water project of International Aid Services (IAS) is working. First I wanted to get a good image of the different areas connected to the IAS water project such as community mobilization, drilling and water source and sanitation education. At the time of my studies the Community Mobilization Unit (CMU) had just began their work, therefore the system with Water Source and Sanitation Committees had not yet been really implemented. However, some had been formed but not trained. The drilling is performed using two different methods, Mud Rotary and Air Flush. Mud Rotary is used in clay soil and Air Flush is used in more rocky soil. One of the main problem issues is transport, mainly transport of drilling machines, well material and water used during drilling. Problems in the means of transport are the terrible conditions of the roads which also lead to terrible conditions of the vehicles, especially the heavy vehicles which are very old. Another main problem is supplies, especially supplies of spares for the vehicles and equipment but also food and other essentials. Many things have to be brought from other countries via Khartoum and then by lorry to Northern Bahr el Ghazal. One of my conclusions is that much weight must be put on the county community mobilization to really involve the local people in the project so that they feel responsible for the well after it has been handed over. This is crucial to get full impact of the project. Another conclusion is that if supplies could be handled through Southern Sudan (Juba) it could cut down transport time and costs. But this cannot be realized yet since the range of things in Juba is rather limited compared to Khartoum. Finally I believe that the personnel must be very observant for coming breakdowns and report this immediately to enable ordering spares, etc. as soon as possible and minimize the time standing still.
3

Simulering av pneumatisk sänkborrhammare

Ek, Fredrik January 2003 (has links)
Denna rapport utgör dokumentationen av ett examensarbete utfört på Atlas Copco Secoroc i Fagersta under handledning av Maskinkonstruktions före detta universitetslektor Håkan Wettergren och Fluid &amp; Mekaniksystems professor Karl-Erik Rydberg och på Atlas Copco Secoroc konstruktör Risto Wisakanto, avdelningschef Thomas Greijer, båda avdelning DTH, samt Secorocs utvecklingschef Lars Holmgren.   Arbetet syftar till att utveckla en simuleringsmodell vilken ska användas vid utveckling av pneumatiska sänkborrmaskiner. Målsättningen var att göra en så bra modell som möjligt, en modell som skulle kunna användas vid utveckling av nya sänkborrmaskiner, och att stegvis förfina en i grunden enkel modell. Första modellen var dock lite för enkel och baserad på teori för slutna system så den gick inte bygga vidare på utan det var enklare att göra en helt ny modell baserad på teori för öppna system. Det var dock inte förgäves att bygga den första modellen utan de geometriska villkoren som använts i den enkla modellen kunde återanvändas i den mer avancerade som tack vare detta relativt snabbt kunde skapas.  Den mer avancerade modellen ger värden som stämmer mycket bra överens med mätresultat vid höga tryck, i detta fall 16 bar. Att modellen inte stämmer överens så bra vid låga tryck kan bero på flera saker, naturligtvis på att faktorer som försummats kanske har stor inverkan vid låga tryck eller att mätvärdena helt enkelt är fel. Maskinen går inte stabilt 6 respektive 10,5 bar utan gör det först vid 16 bar vilket gör att det är relevant att jämföra simulerade värden med mätvärden först vid 16 bar, en annan felkälla kan vara att givarna inte hänger med i det snabba förloppet samt att de inte är helt exakta (Greijer, 2002).     Kartläggning av en befintlig maskins geometrier, studier av termodynamiska lagar samt provborrningsresultat har legat till grund för modellen. / This report constitutes the documentation of a master thesis performed at Atlas Copco Secoroc in Fagersta under supervision by the division of Machine Design’s former lecturer (PhD) Håkan Wettergren and the division of Fluid &amp; Mechanical Engineering System’s professor (PhD) Karl-Erik Rydberg and at Atlas Copco Secoroc design engineer Risto Wisakanto, head of department Thomas Greijer, both department DTH, and Secorocs head of research and development Lars Holmgren. The purpose with this work is to develop a simulation model which will be used at development of pneumatic down-the-hole hammers.  Mapping of an existing machines geometry, studies of thermodynamic laws and test results is the basic sources used during development of this model.
4

Simulering av pneumatisk sänkborrhammare

Ek, Fredrik January 2003 (has links)
<p>Denna rapport utgör dokumentationen av ett examensarbete utfört på Atlas Copco Secoroc i Fagersta under handledning av Maskinkonstruktions före detta universitetslektor Håkan Wettergren och Fluid & Mekaniksystems professor Karl-Erik Rydberg och på Atlas Copco Secoroc konstruktör Risto Wisakanto, avdelningschef Thomas Greijer, båda avdelning DTH, samt Secorocs utvecklingschef Lars Holmgren.   Arbetet syftar till att utveckla en simuleringsmodell vilken ska användas vid utveckling av pneumatiska sänkborrmaskiner. Målsättningen var att göra en så bra modell som möjligt, en modell som skulle kunna användas vid utveckling av nya sänkborrmaskiner, och att stegvis förfina en i grunden enkel modell. Första modellen var dock lite för enkel och baserad på teori för slutna system så den gick inte bygga vidare på utan det var enklare att göra en helt ny modell baserad på teori för öppna system. Det var dock inte förgäves att bygga den första modellen utan de geometriska villkoren som använts i den enkla modellen kunde återanvändas i den mer avancerade som tack vare detta relativt snabbt kunde skapas.  Den mer avancerade modellen ger värden som stämmer mycket bra överens med mätresultat vid höga tryck, i detta fall 16 bar. Att modellen inte stämmer överens så bra vid låga tryck kan bero på flera saker, naturligtvis på att faktorer som försummats kanske har stor inverkan vid låga tryck eller att mätvärdena helt enkelt är fel. Maskinen går inte stabilt 6 respektive 10,5 bar utan gör det först vid 16 bar vilket gör att det är relevant att jämföra simulerade värden med mätvärden först vid 16 bar, en annan felkälla kan vara att givarna inte hänger med i det snabba förloppet samt att de inte är helt exakta (Greijer, 2002).     Kartläggning av en befintlig maskins geometrier, studier av termodynamiska lagar samt provborrningsresultat har legat till grund för modellen.</p> / <p>This report constitutes the documentation of a master thesis performed at Atlas Copco Secoroc in Fagersta under supervision by the division of Machine Design’s former lecturer (PhD) Håkan Wettergren and the division of Fluid & Mechanical Engineering System’s professor (PhD) Karl-Erik Rydberg and at Atlas Copco Secoroc design engineer Risto Wisakanto, head of department Thomas Greijer, both department DTH, and Secorocs head of research and development Lars Holmgren. The purpose with this work is to develop a simulation model which will be used at development of pneumatic down-the-hole hammers.  Mapping of an existing machines geometry, studies of thermodynamic laws and test results is the basic sources used during development of this model.</p>

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