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Nickel electroplating was developed in the first half of the 19th century, with notable experiments made by Golding Bird (1837) and nickel nitrate patent by Joseph Shore (1840). The first practical recipe, an aqueous solution of nickel and ammonium sulfates, was invented by Böttger in 1843 and was in use for 70 years. [8]
The Hull cell is a type of test cell used to semi-quantitatively check the condition of an electroplating bath. It measures useable current density range, optimization of additive concentration, recognition of impurity effects, and indication of macro throwing power capability. [ 14 ]
Copper electroplating is the process of electroplating a layer of copper onto the surface of a metal object. Copper is used both as a standalone coating and as an undercoat onto which other metals are subsequently plated. [ 1 ]
It usually refers to the educational integration of the elementary school and the middle school. After graduating from elementary school, graduates can directly enter into the junior high school. The grades in schools that implement the 9-year System are usually called Grade 1, Grade 2, and so on through Grade 9. Main features of the 9-year System:
Grade 9 subjects include Danish, English, Christian studies, history, social studies, mathematics, geography, biology, physics/chemistry and German and French as electives. [11] Students must sit compulsory school-leaving exams at the end of grade 9, and must also complete a mandatory project assignment during the year. [11] After grade 9 ...
Advancing issues outnumbered decliners by a 2.9-to-1 ratio on the NYSE and by a 2.11-to-1 ratio on the Nasdaq. The S&P 500 posted 71 new 52-week highs and no new lows while the Nasdaq Composite ...
Subjects usually taken up include Communication Arts in Mother Tongue (until Grade 3), English (some private schools break this down into Language and Reading) and Filipino, Mathematics, Science, Social Studies (taught in Mother Tongue from Grade 1-Grade 3, Filipino in Grades 4-6), Music, Art, Physical Education and Health (collectively known ...
Authorities have identified the man who assaulted and killed a Washington woman 36 years ago, and they used DNA to solve the case. Fishermen found a body on Aug. 28, 1988, according to the Pierce ...