First results with a new method for calculating 2-loop box-functions

1999 ◽  
Vol 6 (4) ◽  
pp. 693-699 ◽  
Author(s):  
R. Kreckel ◽  
D. Kreimer ◽  
K. Schilcher
Keyword(s):  
New Method ◽  
First Results

Lubricant compatibility of FKM seals in synthetic oils

2019 ◽  
Vol 72 (5) ◽  
pp. 557-565
Author(s):  
Dilek Bulut ◽  
Tatjana Krups ◽  
Gerhard Poll ◽  
Ulrich Giese
Keyword(s):  
Polyethylene Glycol ◽  
Design Methodology ◽  
Elevated Temperatures ◽  
Failure Mechanisms ◽  
Standard Test ◽  
New Method ◽  
Static Tests ◽  
Content Type ◽  
Lip Seals ◽  
First Results

Purpose Elastomer seals are used in many applications. They are exposed to lubricants and additives at elevated temperatures, as well as mechanical stresses. They can only provide good sealing function when they have resistance to those factors. There are many elastomer-lubricant compatibility tests based on DIN ISO 1817 in industry. However, they are insufficient and costly. Correlations between the tests and the applications are inadequate. The purpose of this study is investigating lubricant compatibility of fluoroelastomers (FKM) seals in polyethylene-glycol (PG)- and polyalphaolefin (PAO)- based synthetic oils and developing a methodology to predict seal service life. Design/methodology/approach A new compatibility test which is more sufficient in terms of time and cost was developed and compared with a standard test, currently used in industry. Compatibility of FKM radial lip seals with PG- and PAO-based synthetic oils with different additives was investigated chemically and dynamically. Failure mechanisms were examined. Findings The new method and the Freudenberg Flender Test FB 73 11 008 showed similar results concerning damages and similar tendencies regarding wear. The additive imidazole derivative was the most critical. Static tests give indications of possible chemically active additives, but alone they are insufficient to simulate the dynamic applications. Originality/value The paper describes a new method to investigate elastomer-lubricant compatibility and gives first results with a variety of lubricants.

Detecting the medieval cod trade: a new method and first results

2008 ◽  
Vol 35 (4) ◽  
pp. 850-861 ◽  
Author(s):  
James Barrett ◽  
Cluny Johnstone ◽  
Jennifer Harland ◽  
Wim Van Neer ◽  
Anton Ervynck ◽  
...  
Keyword(s):  
New Method ◽  
First Results

ION MOBILITY SPECTROMETRY: A NEW METHOD FOR THE DETECTION OF LUNG CANCER AND AIRWAY INFECTION IN EXHALED AIR? FIRST RESULTS OF A PILOT STUDY

CHEST Journal ◽  
2005 ◽  
Vol 128 (4) ◽  
pp. 155S ◽  
Author(s):  
Michael Westhoff ◽  
Patrick Litterst ◽  
Lutz Freitag ◽  
Vera Ruzsanyi ◽  
Sabine Bader ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Pilot Study ◽  
Ion Mobility Spectrometry ◽  
Ion Mobility ◽  
New Method ◽  
Airway Infection ◽  
Exhaled Air ◽  
First Results

New Method to Measure the Relativistic Doppler Shift: First Results and a Proposal

1985 ◽  
Vol 54 (1) ◽  
pp. 11-13 ◽  
Author(s):  
P. Juncar ◽  
C. R. Bingham ◽  
J. A. Bounds ◽  
D. J. Pegg ◽  
H. K. Carter ◽  
...  
Keyword(s):  
Doppler Shift ◽  
New Method ◽  
First Results
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