Essays about: "Yellowing"

Showing result 1 - 5 of 12 essays containing the word Yellowing.

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

    University essay from Lunds universitet/Förpackningslogistik

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

    Abstract : 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. READ MORE

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

    University essay from SLU/Dept. Of Plant Biology

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

    Abstract : 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. READ MORE

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

    University essay from Luleå tekniska universitet/Industriell miljö- och processteknik

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

    Abstract : 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. READ MORE

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

    University essay from SLU/Dept. Of Plant Biology

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

    Abstract : 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. READ MORE

  6. 5. Diversity of barley yellow dwarf-associated viruses in winter cereals of Southern Sweden

    University essay from SLU/Dept. Of Plant Biology

    Author : Marcelle Lauren Johnson; [2019]
    Keywords : barley; BYDV; luteovirus; polerovirus; Skåne; wheat;

    Abstract : Barley yellow dwarf virus (BYDV) is a widespread complex of virus species of cereal crops in the world, known to infect both wild and cultivated plants of the family Poaceae, having the effect of yield reductions and subsequently large economic losses to farmers. Barley yellow dwarf disease (BYD) is a result of infection from BYDV species (genus: Luteovirus) and cereal yellow dwarf virus (CYDV; genus: Polerovirus). READ MORE