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With modern laser-engraving technology, personalized rubber stamps can be made in minutes. Rubber stamps for business commonly show an address, corporate logo and business registration number. [5] [6] Some stamps also have movable parts that allow the user to adjust the date or the wording of the stamp. They are used to date incoming mail, as ...
The following types of material are excluded (although they may also be collected by chemical stamp enthusiasts): Postal stationery, [14] e.g. a postcard depicting a chemist with a non-chemical stamp affixed; Cinderella, local, private or personal issues, i.e. unofficial stamps; Non-postal stamps, e.g. revenue stamps [15]
Barium, typically as barium nitrate imparts a yellow or "apple" green color to fireworks; [30] for brilliant green barium chloride is used. Barium peroxide is a catalyst in the aluminothermic reaction for welding rail tracks. It is also a green flare in tracer ammunition and a bleaching agent. [31] Barium titanate is a promising electroceramic ...
Barium sulfate is used as a catalyst support when selectively hydrogenating functional groups that are sensitive to overreduction. With a low surface area, the contact time of the substrate with the catalyst is shorter and thus selectivity is achieved. Palladium on barium sulfate is also used as a catalyst in the Rosenmund reduction.
A composite, thin PDMS stamp with a rigid back support has been used for patterning to help solve this problem. Magnetic field assisted micro contact printing: to apply a homogeneous pressure during the printing step, a magnetic force is used. For that, the stamp is sensitive to a magnetic field by injecting iron powder into a second layer of PDMS.
Also used in flash powders and some military infrared flares. Barium also serves as a stabilizer for the mixtures; [3] decomposes at higher temperatures than nitrates of lighter metals and promotes higher burning temperatures. With aluminium produces bright silver sparks; when used with aluminium, addition of boric acid as stabilizer is advised.
A never-before-seen ore containing vast quantities of an element widely used in semiconductors has been found in China in a discovery that could propel new advances in battery technology.
The following types of material are excluded (although they may also be collected by crystallography stamp enthusiasts): Postal stationery, [10] e.g. a postcard depicting a crystallographer with a non-crystallographic stamp affixed; Cinderella, local, private or personal issues, i.e. unofficial stamps; Non-postal stamps, e.g. revenue stamps [11]
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