Search

Live Art Network Africa - Postponed

Fri, 2017-11-10 15:46 -- 01406352

The launch of the Live Art Network Africa (LANA), and the accompanying symposium scheduled to take place from 30 November - 3 December 2017 at the University of Cape Town’s Hiddingh Campus, has been postponed to 17 - 21 February 2018. This difficult decision was taken in the wake of ongoing protests, and the Institute for Creative Arts (ICA) tenders sincere apologies for any inconvenience caused.

Operating Instructions for film dessicators

NOTE FIRST: On no account allow a throughput of air into the system with the pump running. This may be done by not closing taps or not sealing the dessicator doors properly. The pump is designed to run continually, but not with a large airflow, which will result in damage.

Each chamber should have a cartridge of zeolite dessicant in the base.

TO REMOVE/REPLACE A FILM CASSETTE

Use the chamber marked "open next".

Operation of Oxford Instruments cryotransfer stage

Initial preparations

  1. Attach cryostage goniometer adaptor to the EM.
  2. Prepare silver dewar with black lid and spout with filtered liquid N2 and larger dewar for filling anticontaminators.
  3. 1200 holder
    1. Turn on HT (load AUTOHT; run; vstep 100 V, 1 sec).
    2. Align microscope (normally 120 kV for low dose) and set specimen position at 1.
    3. Insert Oxford blade anticontaminator into position, holding it against vacuum pressure. (Remove plastic stop and engage to the last slot).

Optical diffraction and defocus calculations

Optical diffractometer

For the present calibration grating, spacing = 0.167 mm, and radius of 1st diffraction spot = 3.05 mm (you need to check this in case the optical components have been moved)

Camera constant = [grating spacing (mm) x diffraction repeat (mm) /magnification] x 106 to convert to nm.

NB: The diffraction repeat is measured in mm, but really corresponds to reciprocal mm, so that bigger spacings on the image correspond to smaller distances on the diffraction pattern.

Services offered

Access to Major Equipment

To use any of the Unit's instruments, you must be a registered user. To enquire about registering, contact Miranda Waldron. Alternatively, the Unit may be able to undertake contract work for you.

Pages