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Etheric Force

Etheric force, a term coined by Thomas Edison to describe a phenomenon that was later to be understood as high frequency electromagnetic waves, effectively, radio. Edison believed it was the mysterious force that was believed to pervade the ether. At t... Read >

Symmetry combinations

Mirror-image symmetry in combination with rotational symmetry In 2D, mirror-image symmetry in combination with n-fold rotational symmetry, with the center of rotational symmetry on the line of symmetry, implies mirror-image symmetry with respect to lines... Read >

Trombone

Construction Basic Trombone Anatomy tuning slide counterweight mouthpiece slide lock ring bell knob/bumper water key/spit valve main slide second slide brace/stay first slide brace/stay bell lock nut A disassembled trombone. From left to righ... Read >

Electronic musical instrument

Early electronic musical instruments Emergence of electronic sound technology In the 18th-century a number of acoustic instruments were adapted by composers in order to exploit the novelty of electricity. Thus, in the broadest sense, the first electrif... Read >

LED lights and light theory

1, LED light emitting structure and principle It has been about 50 years ago, the semiconductor material can produce light of the basic knowledge, the first commercial diode produced in 1960. LED is the English light emitting diode (LED) acronym, and its... Read >

China heavy machinery industry characteristics

According to latest statistical data analysis, this year, China's heavy-duty machinery industry has been rapid development, from January to September, the domestic heavy-duty machinery industry total output value, product sales revenue has broken 100 bill... Read >

Speed up the zipper industry reshuffle

2008 sudden changes in macro-economic "wind" as the Chinese zipper industry reshuffle created a powerful atmosphere. Right now, the zipper as a household goods in people's lives, play an increasingly important role, over the years domestic and internation... Read >

Vietnam financial crisis pay enough attention to invest in Vietnam cooling appliances - home applian

Recently, accepted the majority of household electrical appliance enterprises interviewed said they mostly in Vietnam has just started a local business, small market share overseas, have limited impact on the business of large enterprises impact is "insi... Read >

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