Recent developments in RF and microwave dielectric measurements at the UK National Physical Laboratory

2002 ◽  
Author(s):  
R.N. Clarke
Keyword(s):  
National Physical Laboratory ◽  
Dielectric Measurements ◽  
Microwave Dielectric ◽  
Physical Laboratory ◽  
Recent Developments ◽  
The Uk

Some recent developments at the National Physical Laboratory

1962 ◽  
Vol 265 (1321) ◽  
pp. 141-160
Keyword(s):  
Royal Society ◽  
National Physical Laboratory ◽  
Industrial Research ◽  
Scientific Policy ◽  
Governing Body ◽  
Physical Laboratory ◽  
Recent Developments ◽  
The Creation

When the National Physical Laboratory was founded in 1900, the Royal Society was ‘invited to control the proposed institution and to nominate a governing body’. Since the Royal Society had agitated strongly for the creation of such a laboratory, this invitation was accepted, and although the National Physical Laboratory was incorporated into the Department of Scientific and Industrial Research when that body was created in 1917, the connexion between the Royal Society and the National Physical Laboratory is still very close on all matters of scientific policy.

scholarly journals Down With Magnification: The Micron Marker Rules!

1998 ◽  
Vol 6 (6) ◽  
pp. 12-13
Author(s):  
Joe Geller
Keyword(s):  
Quality Control ◽  
National Physical Laboratory ◽  
Image Display ◽  
Sem Image ◽  
Si Units ◽  
Current Wave ◽  
Physical Laboratory ◽  
The Uk ◽  
Almost All ◽  
The U.S

With today's current wave of quality consciousness, our quality control people tell us we MUST calibrate our instruments using standards that are traceable to the national laboratories (NIST - National Institute of Standards and Technology in the U.S.,. NPL - National Physical Laboratory in the UK, and others). But, is it really magnification that should be calibrated?While recently walking around the exhibit floor at the Microscopy & Micrcanalysis ‘98 Conference, I noticed the large SEM image display screens that now present our highly magnified specimens. Almost all vividly show a micron (using SI units this should be a “micrometer”) marker as well as the magnification. No doubt the accuracy is within the ± 3% that is commonly quoted by the manufacturers.

The Boundary Layer and Recent Developments

1936 ◽  
Vol 40 (309) ◽  
pp. 563-585 ◽  
Author(s):  
L. Bairstow
Keyword(s):  
Boundary Layer ◽  
National Physical Laboratory ◽  
Boundary Layer Theory ◽  
Compressed Air ◽  
Flat Plates ◽  
Physical Laboratory ◽  
Recent Developments

As time passes more and more knowledge of the flow of fluids past bodies accumulates and of this increase some becomes applied to the problems of the day. Boundary layer theory is being applied at the present time to the problem of the degree of polish which should be given to a wing in order to reduce its profile drag to a minimum. Tests in the compressed air tunnel at the National Physical Laboratory and in flight at Cambridge and Farnborough have recently been directed to this point and give quantitative assurance of the correctness of theory. In what follows, a survey is made of a group of theorems relating to the resistance of various bodies such as aerofoils and flat plates and more generally to streamline forms. The theorems are partly physical and partly mathematical and approximations are numerous and of very different degrees of validity.

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