Sökning: "stabilisers"

Visar resultat 1 - 5 av 24 avhandlingar innehållade ordet stabilisers.

  1. 1. Voltage Stabilisers for XLPE Cable Insulation

    Författare :Villgot Englund; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; polyethylene; insulation; electrical treeing; degradation; cable; stabilisers; XLPE;

    Sammanfattning : The demand for energy in the Western world has istorically increased steadily and a steady increase is forecasted for the next decades. This steady increase together with the huge merging markets in India and China are setting new standards for the energy transmission. LÄS MER

  3. 2. Consumption and loss of commercial stabilisers in polyethylene exposed to different natural environments

    Författare :Nadejzda Haider; KTH; []
    Nyckelord :LDPE; MDPE; ultrasonic extraction; polymer additives; stabilisers; antioxidants; HALS; Irganox 1010; Irgafos 168; migration; consumption; GC-MS; additive degradation products;

    Sammanfattning : A procedure for the extraction and analysis of commercialstabilisers in low density and medium density polyethylene(LDPE and MDPE) films was developed and used to study theconsumption of stabilisers in polymers exposed to differentnatural environments. An ultrasonic technique was applied toextract HALS-3 (Chimassorb 944) from LDPE film and antioxidants(Irganox 1010 and Irgafos 168) from MDPE film. LÄS MER

  4. 3. Regime Stability and Foreign Policy Change : Interaction between Domestic and Foreign Policy in Hungary 1956-1994

    Författare :Tomas Niklasson; Statsvetenskapliga institutionen; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; WTO; comecon; CMEA; gorbachev; antall; kádár; ethnic minorities; hungarian politics; hungary; political opposition; authoritarian regime; reference society; two-level game; stabilisers; foreign policy change; foreign debt; economic reform; democratisation; coercion; legitimacy; regime stability; political stability; warsaw pact; CSCE; OSCE; EU enlargement; NATO enlargement; Political and administrative sciences; Statsvetenskap; förvaltningskunskap;

    Sammanfattning : Domestic and foreign policy cannot always be kept apart. A change of Government at national level may impact on foreign policy, and foreign policy adventures sometimes translate into consequences at home. LÄS MER

  5. 4. New Test Arrangement for Measuring Electrical Treeing in Polymers

    Författare :Ramona Huuva; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Voltage stabilisers.; Wire-plane configuration; Polyethylene LDPE; Needle electrode; XLPE ; Electrical treeing;

    Sammanfattning : Electrical treeing in high voltage cable insulation has been studied for a number of years and today the mostly used laboratory test set-up is the needle-plane electrode configuration. In this thesis a different type of electrode configuration is described. LÄS MER

  7. 5. Electrical properties of thermally aged polyethylenes and of polyethylenes containing voltage stabilisers

    Författare :Patrik A. Roseen; KTH; []
    Nyckelord :;

    Sammanfattning : The use of polyethylene (PE) in electrical applications athigh voltages requires a certain resistance of the material topartial discharges (PDs). The space charge behaviour of PE isof great importance when PE is used as insulator inhigh-voltage DC cables. LÄS MER