Application of Infrared Spectrometry in Studying Fuels and Biofules for Aircraft Turbine Engines

AbstractThe research paper presents hydrocarbon biocomponents approved for use in aircraft turbine engines. The properties of these biocomponents are governed by ASTM D 7566 standard. One of the new issues regarding the utilization of fuels for aircraft turbine engines is the identification of non-petroleum elements, including hydrocarbon biocom-ponents. This article proposes applying infrared spectrometry as a technique for in-strumental analysis, which enables quick and qualitative identification of a used hydro-carbon biocomponent. Differences in the infrared spectrum between the mineral fuel and used fuel biocomponent were indicated based on the conducted preliminary tests.

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DETERMINATION OF MICRO-AMOUNTS OF 5β-PREGNAN-3α-OL-20-ONE IN URINE USING INFRARED-SPECTROMETRY

Acta Endocrinologica ◽

10.1530/acta.0.0410234 ◽

1962 ◽

Vol 41 (2) ◽

pp. 234-246 ◽

Cited By ~ 5

Author(s):

H. J. van der Molen

Keyword(s):

Infrared Spectrum ◽

Quantitative Determination ◽

Acid Hydrolysis ◽

Chromatographic Separation ◽

Pure Form ◽

Infrared Spectrometry ◽

Hydrolysis Of

ABSTRACT A procedure for the quantitative determination of 5β-pregnan-3α-ol-20-one in urine is described. After acid hydrolysis of the pregnanolone-conjugates in urine, the free steroids are extracted with toluene. Pregnanolone is isolated in a pure form as its acetate; after chromatographic separation of the free steroids on alumina, the fraction containing pregnanolone is acetylated and rechromatographed on alumina. Quantitative determination of the isolated pregnanolone-acetate is carried out with the aid of the infrared spectrum recorded by a micro KBr-wafermethod. The reliability of the method under various conditions is discussed under the headings, specificity, accuracy, precision and sensitivity. It is possible to determine 30–40 μg pregnanolone in a 24-hours urine portion with a precision of 25%.

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THE STUDY OF INTERACTIONS IN THE SYSTEM OF ”BORIC ACID-UREA” BY THE METHOD OF INFRARED-FURIE SPECTROMETRY

Vestnik of Samara University Natural Science Series ◽

10.18287/2541-7525-2012-18-3.1-145-155 ◽

2017 ◽

Vol 18 (3.1) ◽

pp. 145-155

Author(s):

A.L. Lobachev ◽

I.V. Lobacheva ◽

E.V. Revinskaya ◽

N.A. Redkin

Keyword(s):

Infrared Spectrum ◽

Boric Acid ◽

Infrared Spectrometry ◽

Influence Of Temperature ◽

Technical Mixture ◽

The Given ◽

Duration Of Heating

The possibility of usage of method of infrared spectrometry with Furie transformation for the investigation of the depth of the ﬂow of interactions in the system of ”boric acid-urea” is investigated. It is shown that infrared spectrum reﬂects even the smallest changes of the structure of the given system very good. The investigation of the inﬂuence of temperature, duration of heating, and correlation of components of the technical mixture ”boric acid-urea” on the process of their interaction is carried out.

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Examination of Fracture Interfaces in Silicon Nitride

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100113925 ◽

1975 ◽

Vol 33 ◽

pp. 60-61

Author(s):

Nancy J. Tighe

Keyword(s):

Silicon Nitride ◽

Grain Boundary ◽

Crack Growth ◽

Subcritical Crack Growth ◽

Slow Crack Growth ◽

Ceramic Materials ◽

Grain Boundary Sliding ◽

Boundary Phase ◽

Turbine Engines ◽

Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

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TEM study of boron additions to cobalt aluminide

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100104790 ◽

1988 ◽

Vol 46 ◽

pp. 546-547

Author(s):

Gerald B. Feldewerth

Keyword(s):

High Temperature ◽

Turbine Engines ◽

Major Drawback ◽

University Of Missouri ◽

Specific Strength ◽

Aerospace Applications ◽

Wide Range ◽

Ordered Alloys ◽

The University ◽

Very High

In recent years an increasing emphasis has been placed on the study of high temperature intermetallic compounds for possible aerospace applications. One group of interest is the B2 aiuminides. This group of intermetaliics has a very high melting temperature, good high temperature, and excellent specific strength. These qualities make it a candidate for applications such as turbine engines. The B2 aiuminides exist over a wide range of compositions and also have a large solubility for third element substitutional additions, which may allow alloying additions to overcome their major drawback, their brittle nature.One B2 aluminide currently being studied is cobalt aluminide. Optical microscopy of CoAl alloys produced at the University of Missouri-Rolla showed a dramatic decrease in the grain size which affects the yield strength and flow stress of long range ordered alloys, and a change in the grain shape with the addition of 0.5 % boron.

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