MRT letter: full-tilt electron tomography w... [Microsc Res Tech. 2008] - PubMed

September 6, 2013 – 11:09
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Source

Department of Engineering Materials, University of Sheffield, Sheffield S1 3JD, United Kingdom.

Abstract

Piezoelectric nanoactuation, which is rapidly becoming established as state-of-the-art positioning control in transmission electron microscopy (TEM), is extended here to include a rotational degree of freedom. A piezoelectric goniometer with both translational and rotary drive action has been designed with high level of miniaturization to fit into a standard TEM specimen holder shaft without compromising any of the performance of the default TEM goniometer and without any modifications to the TEM. Enhanced functionality of such a goniometer-in-goniometer is outlined and experimental results for electron tomography of nanostructures over a full tilt range of views, without any missing angles, are demonstrated.


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Source: www.ncbi.nlm.nih.gov

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Click is usually actuator arm not head crash

2013-04-26 12:55:58 by RobNLA

The click can mean a head crash happened, and it may indicate that the head is being dragged on the platter, but it's not actually from the head hitting the platter.
In modern drives the clicking is almost always a result of the arm sweeping back and forth over the disk trying to get position data. The clicking sound is the back end of the actuator arm hitting the stop that constrains the arm's range of movement.
The clicking sound is usually caused by one of these:
1. Spindle motor failure/stuck spindle/bad power to motor
2. Circuit board failure
3. Read/write head failure

More ideas

2009-09-01 13:40:40 by davidcarradineded

Try taping the drive, with your knuckle, may throw it in working
long enoug
if you open the drive, do not get finger prints on the platter, its the oil from us that does the damage, not dust particles
the clicking you hear means the arm has scratched the disk, you might replace the head on the actuator arm, google it,
When you are replacing boards watch out for static electricity
I think its the head on the actuator arm, what fun
I back up my data three or four times now, jumbo drives are cheap now, and I also back up to dvd copies off site
(Never tried the freezing, I would worry about moisture...)

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