Yunus Emre Aydoğdu 030050084

6. week

rotary evaporator 22.03.11 21:41

Rotary evaporators are a common feature in most undergraduate laboratories. Their primary purpose is to remove solvent following a reflux, perhaps before crystallization of a reaction product. To operate the evaporator, we place the reaction solution in a raound-bottomed flask while pressure inside the evaporator is decreased to about 1/30 x p⁰. The flask is then rotated. The solvent evaporates more easily at this low pressure than at p⁰ . The solvent removed under vacuum is trapped by a consider and collected for easy re-use, or disposal in an environmentally sensitive way.

(Monk P. M. S., Physical Chemistry: Understanding Our Chemical World, 2004, p.188)

Bending rate 22.03.11 22.11

Bending rate is the rate of the static tension on materials, where T is the weight of unloaded conveyance plus weight of ropes. The maximum recomended value for a recomended value for a particular installation is a function of the coefficient of friction of the treat materials, of the acceleration and deceleration required, and the angle of the lap of the material.

(Seeley W. Mudd Memorial Fund of AIME.,Society for Mining, Metallurgy, and Exploration (U.S.)SME Mining Handbook second edition, page 1666)

hardcoating 22.03.11 22:30

Although some types of glass are softer than others, generally they offer sufficient abrasion resistance not to require a hard surface coating.Same special glasses do require a coating because of their tendency to strain, but these are normally high index glasses, which would in any case, usually have a antireflection coating.

Hard coats are made from different materials but there are two main parts. The most common are lecquer hard coats applied by dipping or spinning, less common are the vacuum-deposites hard coats, which are thinner but of a harder material.

(Mo Jalie,Ophthalmic lenses & dispensing, second edition, page 81)

Self-directed work team 22.03.11 22.35

Self directed work team is a small number of people (7-15) with complementary skills who are committed to a common purpose,performance goals and approach for which they hold themselves mutually accountable.

(Paul C. Palmes, The magic of self directed work teams, 2006 page 31)