A Vacuum‐Tube Current Integrator of Improved Design

1949 ◽  
Vol 20 (4) ◽  
pp. 323-323 ◽  
Author(s):  
L. H. v. d. Tweel
Keyword(s):  
Vacuum Tube ◽  
Tube Current ◽  
Improved Design

A Vacuum Tube Current Integrator

1941 ◽  
Vol 12 (8) ◽  
pp. 412-413
Author(s):  
Gilbert J. Perlow
Keyword(s):  
Vacuum Tube ◽  
Tube Current

An Improved Design for Vacuum Tube Drains

2000 ◽  
Vol 45 (5) ◽  
pp. 565-566
Author(s):  
Oren Lapid ◽  
Yuval Kreiger ◽  
Ronen Glesinger ◽  
Alexander Bogdanov-Berezovsky
Keyword(s):  
Vacuum Tube ◽  
Improved Design

An improved design for an Scanning Tunnelling Microscope (STM) for use in a Transmission Electron Microscope (TEM)

1991 ◽  
Vol 49 ◽  
pp. 384-385
Author(s):  
W.K. Lo ◽  
J.C.H. Spence
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Mechanical Stability ◽  
Scanning Tunnelling Microscope ◽  
Reflection Mode ◽  
Specimen Holder ◽  
Transmission Electron ◽  
Scanning Tunnelling ◽  
Improved Design

An improved design for a combination Scanning Tunnelling Microscope/TEM specimen holder is presented. It is based on earlier versions which have been used to test the usefulness of such a device. As with the earlier versions, this holder is meant to replace the standard double-tilt specimen holder of an unmodified Philips 400T TEM. It allows the sample to be imaged simultaneously by both the STM and the TEM when the TEM is operated in the reflection mode (see figure 1).The resolution of a STM is determined by its tip radii as well as its stability. This places strict limitations on the mechanical stability of the tip with respect to the sample. In this STM the piezoelectric tube scanner is rigidly mounted inside the endcap of the STM holder. The tip coarse approach to the sample (z-direction) is provided by an Inchworm which is located outside the TEM vacuum.

Radiation Minimisation and Outcome Maximisation in Cardiac Computed Tomograpy

2010 ◽  
Vol 6 (1) ◽  
pp. 15
Author(s):  
James P Earls ◽  
Jonathon A Leipsic ◽  
◽  
Keyword(s):  
Radiation Dose ◽  
Dose Reduction ◽  
New Technologies ◽  
Cardiac Computed Tomography ◽  
Substantial Reduction ◽  
Radiation Doses ◽  
Tube Current ◽  
Prospective Triggering ◽  
Effective Radiation ◽  
Selection Of

Recent reports have raised general awareness that cardiac computed tomography (CT) has the potential for relatively high effective radiation doses. While the actual amount of risk this poses to the patient is controversial, the increasing concern has led to a great deal of research on new CT techniques capable of imaging the heart at substantially lower radiation doses than was available only a few years ago. Methods of dose reduction include optimised selection of user-defined parameters, such as tube current and voltage, as well as use of new technologies, such as prospective triggering and iterative reconstruction. These techniques have each been shown to lead to substantial reduction in radiation dose without loss of diagnostic accuracy. This article will review the most frequently used and widely available methods for radiation dose reduction in cardiac CT and give practical advice on their use and limitations.

The Development and Investigation of a Numerical Dynamic Model of Vacuum-Tube Devices

2002 ◽  
Vol 58 (1-2) ◽  
pp. 8
Author(s):  
M. V. Glumova ◽  
M. D. Vorobyov ◽  
V. V. Starostenko
Keyword(s):  
Dynamic Model ◽  
Vacuum Tube

The structure improved design of rod load reducer in Tahe oil field

2013 ◽  
Author(s):  
Zhiqiang Huang ◽  
Liyan Liu ◽  
Qin Li ◽  
Chengsong Qiu ◽  
Yachao Ma
Keyword(s):  
Oil Field ◽  
Improved Design ◽  
Tahe Oil Field
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