<%
id=request("id")
set rs=server.CreateObject("ADODB.Recordset")
if id<>"" then
sqltext="select * from news where id="&id&""
else
sqltext="select top 1 * from news where news10=3"
end if
rs.Open sqltext,cn,1,1
set news3=rs("news3")
set news5=rs("news5")
set news6=rs("news6")
set news8=rs("news8")
set news12=rs("news12")
%>
Porcelain is a ceramic material made by heating raw materials, generally including clay in the form of kaolin, in a kiln to temperatures between 1,200 °C (2,192 °F) and 1,400 °C (2,552 °F). The toughness, strength, and translucence of porcelain arise mainly from the formation of glass and the mineral mullite within the fired body at these high temperatures .
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Porcelain derives its present name from its resemblance to the cowrie shell, which in old Italian porcellana, from feminine of porcellano, of a young sow (from the shell's resemblance to a pig's back), from porcella, young sow, diminutive of porca, sow, from Latin, feminine of porcus, pig, and from the Greek , (Porcelain). Properties associated with porcelain include low permeability and elasticity; considerable strength, hardness, glassiness, brittleness, whiteness, translucence, and resonance; and a high resistance to chemical attack and thermal shock. |
For the purposes of trade, the Combined Nomenclature of the European Communities defines porcelain as being "completely vitrified, hard, impermeable (Porcelain), white or artificially coloured, translucent (except when of considerable thickness) and resonant." However, the term porcelain lacks a universal definition and has "been applied in a very unsystematic fashion to substances of diverse kinds which have only certain surface-qualities in common" (porcelain).
Porcelain is used to make table, kitchen, sanitary, and decorative wares; objects of fine art; and tiles. Its high resistance to the passage of electricity makes porcelain an excellent insulator. Dental porcelain is used to make false teeth, caps and crowns.
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