Recently, the "Inspection Method of Gel Particles in Polyacrylonitrile Polymer Solution" invented by the Xi'an Institute of Optics and Precision Mechanics of the Chinese Academy of Sciences has obtained the national patent authorization, the patent number is "201010210608.9".
"Testing method for gel particles in polyacrylonitrile polymerization solution" solves the technical problem that the gel particles in polyacrylonitrile polymerization solution in the existing inspection method will cause hole clogging, broken wires or paste boards. Specifically, it includes the following steps: 1. Adjust the weight percentage of polyacrylonitrile polymerization solution to 2-8% with an organic solvent (dimethylsulfoxide, dimethylformamide or dimethylacetamide); 2. Use glass fiber filter paper Filter the above solution, the pore size of the glass fiber filter paper is 0.5 ~ 2μm; 3. Irradiate the glass fiber filter paper filtered with the above solution under an ultraviolet fluorescent lamp, if there is foreign matter on the filter paper that emits white or bluish white light, there is gel in the polymerization solution Particles; otherwise, no gel particles are present in the polymerization solution.
This "method for testing gel particles in polyacrylonitrile polymerization solution" does not require expensive detection equipment and can quickly and inexpensively detect the presence of gel particles in polyacrylonitrile polymerization solution.
A coffee table is a low table designed to be placed in a sitting area for convenient support of beverages, remote controls, magazines, books (especially large, illustrated coffee table books), decorative objects, and other small items.
Most coffee tables are made of wood (though faux wood tables are increasingly common) or glass and metal, typically, stainless steel or aluminum and may incorporate cabinets or drawers.
Coffee tables were thought to initially be constructed in Renaissance England.
Origins
Japanese style coffee table.
In Europe, the first tables specifically designed as and called coffee tables, appear to have been made in Britain during the late Victorian era.
Couch and coffee table in a hotel room
According to the listing in Victorian Furniture by R. W. Symonds & B. B. Whineray and also in The Country Life Book of English Furniture by Edward T. Joy, a table designed by E. W. Godwin in 1868 and made in large numbers by William Watt, and Collinson and Lock, is a coffee table. If this is correct it may be one of the earliest made in Europe. Other sources, however, list it only as "table" so this can not be stated categorically. Far from being a low table, this table was about twenty-seven inches high.[citation needed]
Later coffee tables were designed as low tables and this idea may have come from the Ottoman Empire, based on the tables in use in tea gardens. However, as the Anglo-Japanese style was popular in Britain throughout the 1870s and 1880s and low tables were common in Japan, this seems to be an equally likely source for the concept of a long low table.
From the late 19th century onwards, many coffee tables were subsequently made in earlier styles due to the popularity of revivalism, so it is quite possible to find Louis XVI style coffee tables or Georgian style coffee tables, but there seems to be no evidence of a table actually made as a coffee table before this time. Joseph Aronson writing in 1938 defines a coffee table as a, "Low wide table now used before a sofa or couch. There is no historical precedent...," suggesting that coffee tables were a late development in the history of furniture. With the increasing availability of television sets from the 1950s onwards coffee tables really came into their own since they are low enough, even with cups and glasses on them, not to obstruct the view of the TV.[citation needed]
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