Cemre Ablay, 030060150, 8th Week

Pickling: (01.04.2011, 18:47)

Another chemical cleaning process is pickling, which is an acid-cleaning treatment that removes oxide scale and flux residues. Pickling involves cleaning of metal parts in dilute acids by spraying or immersion. Common acids used in pickling are 10% H2SO4 at 150-185°F or HCl acid in room temperature. The part is first cleaned with an alkali to allow acid to reach all surfaces. Pickling solution does not attack certain types of oils and grease, and alternative cleaning treatments may be needed.

(Asthana R. et al., Materials Processing an Manufacturing Science, p.316)

...............................................................................................

Amplitude: (02.04.2011, 22:49)

Amplitude is the maximum value of displacement. While describing simple harmonic motion (SHM), we mentioned that energy of a system executing SHM alternates between kinetic and potential forms. At the extremities of the oscillation, which are also called the turning points, the kinetic energy is zero and the potential energy is maximum.

(Garg S., Ghosh C.K., Gupta S., Oscillations and Waves, page 42)

...............................................................................................

Frequency: (02.04.2011, 22:49)

Frequency is the number of complete oscillations executed per second. It is expressed in cycles per seconds or simply [1/s] or Hertz (Hz). If the frequency is v, the system executes v oscillations per second.

(Garg S., Ghosh C.K., Gupta S., Oscillations and Waves, page 42)

...............................................................................................


Resin: (03.04.2011, 00:02)

A resin is a high-molecular-weight organic material with no sharp melting point. Resins usually exhibit a tendency to flow when subjected to stress, and they fracture in a ductile mode. Most resins are polymers. In reinforced plastics, the resin is the material used to bind together the reinforcement material (i.e., the matrix).

(Harper C.A., Petrie E.M., Plastics Materials and Processes: A Concise Encyclopedia, p.482)