The attenuation coefficient and phase velocity of plane sound waves propagating in three perpendicular directions in glass wool were measured in the frequency range 50-10,000 Hz. For glass wool of mass density 14 kg/m3 at the frequency 1,000 Hz, the attenuation constant for propagation perpendicular to the glass wool sheets was 75 dB/m, and for propagation parallel with the sheets 57 dB/m. For ...

BACKGROUND Cotton wool spots are known to be a complication in patients with thrombotic thrombocytopenic purpura or with polymyositis. CASE A 53-year-old woman developed numerous cotton wool spots around the optic disc of both eyes. OBSERVATIONS Fluorescein angiography disclosed capillary obstruction and microaneurysms in the early phase, followed by dye leakage in the late phase. Systemica...

Insulation of buildings in order to save heating energy is an important technology for enabling sustainable development. This paper summarises the results of a comparative LCA study according to ISO 14040 standard series of HT stone wool, flax representing crop grown products and paper wool representing recycled products applied for roof insulation. As the three materials have vastly different ...

In four sheep dosed with N-[5-(4-aminophenoxy)pentyl]phthalimide (400 mg/kg live weight) fibre growth stopped within l-ls days and the sheep were readily defleeced after 9 days. Most follicles stopped growing fibres for 12-16 days. When wool growth resumed, autoradiographic measurements indicated that it was slightly enhanced in the early regrowth due to an increase in fibre diameter. This incr...

Wool textiles have been coated with nordihydroguaiaretic acid (NDGA) to improve their performance at use. This water insoluble phenolic compound has been grafted on wool through a laccase enzyme catalyzed reaction in an 80/20 (v/v, %) aqueous-ethanol mixture. The capacity of laccase to oxidise NDGA in this aqueous-organic medium has been studied electrochemicaly. FTIR spectra, together with the...

Eyring’s non-linear visco-elastic model has been used to describe two important time dependent mechanical behaviors for textile materials such as stress relaxation and creep. Three yarns suitable for the production of stretch fabrics, viz. 100% wool, wool–lycra and polyester–wool–lycra spun from siro spinning technology are considered in this study. The complex mathematical equations of Eyring’...

Figure 2: Formation of a polypeptide by reaction of amino acids. (R , R and R may be the same or different 1 2 3 side groups). These contaminants are removed during processing. Clean wool, together with other animal fibres, belongs to a group of proteins known as keratins. Unlike cotton and the majority of synthetic fibres, wool does not have a homogeneous structure. Wool fibres have highly com...

Figure 2: Formation of a polypeptide by reaction of amino acids. (R , R and R may be the same or different 1 2 3 side groups). These contaminants are removed during processing. Clean wool, together with other animal fibres, belongs to a group of proteins known as keratins. Unlike cotton and the majority of synthetic fibres, wool does not have a homogeneous structure. Wool fibres have highly com...

local scouring around bridge piers is a natural phenomenon caused by the erosive process of flowing stream on alluvial beds. the 3d flow field around bridge piers interacting with the bed materials increases complexity of local scour process. the local scour depth develops in accelerated flows and if it is not predicted correctly, the bottom level of local scour hole will exceed the original le...