Light flow

Overhead projector and beamer have much in common. Focus them beforehand and try them out by looking at the projection from poor places in the room. A good overhead projector gives ten times the light flow of a beamer. However, it also distorts the projection and has a low contrast. Beamers are getting more reliable, but we always try them out before the presentation before the public is in the room. 

One of the main goals of the optical materials engineer is to control the direction of light flow. For the electrical engineer, the analogous task of controlling the flow of... 

ACETAL (105-57-7) Forms explosive mixture with air (flash point —5 F/-20°C cc). Reacts violently with oxidizers. Forms unstable and explosive peroxides on contact with heat and light. Flow or agitation of substance may generate electrostatic charges due to low... 

A solution of pentacarbonyliron (50.0 g, 33.6 mL, 255 mmol), l-(4-methoxyphenyl)-4-phenyl-l-azabuta-1,3-diene (7.70 g, 32.4 mmol), and cyclohexa-l,3 iene (31.3 g, 37.2 mL, 391 mmol) in dioxane (200 mL) is heated at reflux. During the reaction, a light flow of argon is directed through the apparatus. After a reaction time of 72 h, a solution of the azabutadiene catalyst (2.00 g, 8.43 mmol) and cyclohexa-1,3-diene (4.21 g, 5.0 mL, 52.5 mmol) in dioxane (50 mL) is added. The reaction mixture is stirred at reflux for 24 h. Caution Carbon monoxide is formed in the course of the reaction). The solvent is evaporated, pentane (200 mL) is added to the residue, and the solution is filtered over Celite to provide, after evaporation of the solvent, the tricarbonyliron complex as a yellow oil 50.2 g (89%). ... 

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