Sökning: "Yellowing"

Visar resultat 1 - 5 av 16 uppsatser innehållade ordet Yellowing.

  1. 1. The discoloration of polyethylene obtained from chemical separation of laminates: Investigating additives and other potential causes

    Master-uppsats, Lunds universitet/Förpackningslogistik

    Författare :Can Feng; [2021]
    Nyckelord :Delamination; multilayered packaging; polymer discoloration; plastic film; recycling; Technology and Engineering;

    Sammanfattning : PolyAl, the material composed of laminated polyethylene (PE) films and aluminum (Al) in carton, is a challenge in recycling due to the strong adhesion of the layers and the low value of the end products. In Europe, recent efforts to improve the circularity of carton packages include the chemical separation of PolyAl, in order to obtain higher values of the PE and Al separately. LÄS MER

  3. 2. Virus yellows in sugar beets in Sweden and Europe

    Kandidat-uppsats, SLU/Dept. Of Plant Biology

    Författare :Alma Gustavsson Ruus; [2020]
    Nyckelord :virus yellows; BYV; BMYV; BChV; BWYV; sugar beet; Myzus persicae; green peach aphid; Aphis fabae; black bean aphid; neonicotinoids;

    Sammanfattning : This thesis describes virus yellows in sugar beets and converse both older and new knowledge about the viruses, vector and host relations and the control measures against the disease. The aim is to explore new potential control measures and to predict how the disease may affect agriculture in the future. LÄS MER

  4. 3. Thermal induced yellowing of peroxide bleached birch pulp

    Uppsats för yrkesexamina på avancerad nivå, Luleå tekniska universitet/Industriell miljö- och processteknik

    Författare :Alexander Nygren; [2020]
    Nyckelord :Accelerated ageing; Bleaching; Brightness reversion; Kraft pulp; pH; Yellowing;

    Sammanfattning : Brightness reversion, also known as yellowing, is a well-known phenomenon which means that the brightness of paper products decreases during ageing. The name of this phenomenon is based on that paper products usually change in color towards yellow during ageing. LÄS MER

  5. 4. Bekämpningsmedel för trädgårdar: utbudet i Lunds närområde och effekter på icke-målarter

    Kandidat-uppsats, Lunds universitet/Miljövetenskaplig utbildning

    Författare :Elsa Welin; [2020]
    Nyckelord :Keywords: pesticides; plant protection products; non-target organisms; private gardens; home gardens; pyrethrin; acetamiprid; pelargonic acid Nyckelord: bekämpningsmedel; växtskyddsmedel; icke-målorganismer; icke-målarter; privata trädgårdar; hemträdgårdar; pyretrin; pelargonsyra; Earth and Environmental Sciences;

    Sammanfattning : Several studies show that the use of pesticides within agricultural management have led to increased losses of biodiversity. However, information on the effects of garden pesticides on non-target organisms and the type of products used in private gardens are lacking. LÄS MER

  7. 5. Detection of poleroviruses causing virus yellows in sugar beet

    Master-uppsats, SLU/Dept. Of Plant Biology

    Författare :Josefin Pettersson; [2020]
    Nyckelord :beet chlorosis virus; beet mild yellowing virus; sugar beet; Sweden; turnip yellows virus;

    Sammanfattning : Sugar beet is a crop cultivated for production of sugar. Many diseases can cause yield loss of sugar beet, where some are caused by viruses. Virus yellows is caused by several viruses and is visible as yellowing of sugar beet leaves. These viruses are transmitted by aphids and can be found across the world in temperate regions. LÄS MER