A Dual-Element Transducer for Measuring High Gas-Stream Temperatures

1965 ◽  
Vol 87 (3) ◽  
pp. 397-402 ◽  
Author(s):  
W. H. Giedt ◽  
J. T. Chambers
Keyword(s):  
Temperature Profile ◽  
Experimental Evaluation ◽  
Stream Temperature ◽  
Thermal Capacity ◽  
Profile Measurement ◽  
Experimental Accuracy ◽  
Medium Temperature ◽  
Temperature Time ◽  
Made In

An experimental evaluation of a dual-element transducer for measuring gas stream temperatures is described. Temperatures are inferred from simultaneous temperature-time measurements of two elements of identical geometry but unequal thermal capacity. The major effort was devoted to measurements in medium-temperature streams to prove the feasibility of the method. The accuracy of the results was within ±6 percent for measurements from 1950 to 2250 deg F, which was the best experimental accuracy predicted by an earlier analysis of the concept. A limited number of measurements were made in an oxyacetylene flame. The indicated flame temperatures were 4700 and 4789 deg F which agree within 5 percent with measurements made by sodium-line-reversal techniques for equivalent combustion conditions. A gas-stream temperature profile measurement is also presented.

Temperature profile measurement of graphite material using a CO2laser

2010 ◽  
Vol 82 (5) ◽  
pp. 055402 ◽  
Author(s):  
Payal Mehta ◽  
Arun Sarma ◽  
Joydeep Ghosh ◽  
Shwetang Pandya ◽  
Santosh Pandya ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Profile Measurement ◽  
Graphite Material

Rayleigh-Raman lidar used for atmospheric temperature profile measurement

2010 ◽  
Vol 22 (7) ◽  
pp. 1449-1452
Author(s):  
卜令兵 Bu Lingbing ◽  
郭劲秋 Guo Jinqiu ◽  
田力 Tian Li ◽  
黄兴友 Huang Xingyou ◽  
刘博 Liu Bo ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Atmospheric Temperature ◽  
Profile Measurement ◽  
Raman Lidar ◽  
Atmospheric Temperature Profile

scholarly journals Non-stationary temporal characterization of the temperature profile of a soil exposed to frost in south-eastern Canada

2008 ◽  
Vol 15 (3) ◽  
pp. 409-416 ◽  
Author(s):  
F. Anctil ◽  
A. Pratte ◽  
L. E. Parent ◽  
M. A. Bolinder
Keyword(s):  
Time Series ◽  
Soil Temperature ◽  
Temperature Profile ◽  
Air Temperature ◽  
Soil Depth ◽  
Time Lag ◽  
Power Spectra ◽  
Temperature Time Series ◽  
Soil Temperatures ◽  
Temperature Time

Abstract. The objective of this work was to compare time and frequency fluctuations of air and soil temperatures (2-, 5-, 10-, 20- and 50-cm below the soil surface) using the continuous wavelet transform, with a particular emphasis on the daily cycle. The analysis of wavelet power spectra and cross power spectra provided detailed non-stationary accounts with respect to frequencies (or periods) and to time of the structure of the data and also of the relationships that exist between time series. For this particular application to the temperature profile of a soil exposed to frost, both the air temperature and the 2-cm depth soil temperature time series exhibited a dominant power peak at 1-d periodicity, prominent from spring to autumn. This feature was gradually damped as it propagated deeper into the soil and was weak for the 20-cm depth. Influence of the incoming solar radiation was also revealed in the wavelet power spectra analysis by a weaker intensity of the 1-d peak. The principal divergence between air and soil temperatures, besides damping, occurred in winter from the latent heat release associated to the freezing of the soil water and the insulation effect of snowpack that cease the dependence of the soil temperature to the air temperature. Attenuation and phase-shifting of the 1-d periodicity could be quantified through scale-averaged power spectra and time-lag estimations. Air temperature variance was only partly transferred to the 2-cm soil temperature time series and much less so to the 20-cm soil depth.

The Use and Results of the Wind Machine to Prevent Freeze Damage

1959 ◽  
Author(s):  
James G. Georg
Keyword(s):  
Temperature Profile ◽  
Weather Conditions ◽  
Federal State ◽  
Primary Concern ◽  
Small Tree ◽  
The Past ◽  
Freeze Damage ◽  
Frost Protection ◽  
Made In

The Federal-State Frost Warning Service, Lakeland, Florida has been investigating the use of wind machines for frost protection under Florida weather conditions for the past six years. Lake Garfield Nurseries Company of Bartow was the cooperator during all the investigations to date. Their machines were located in nursery and small tree plots, and the effectiveness of the machines on the 18" temperature profile was our primary concern. More recently, however, studies at standard shelter height have also been made in a bearing grapefruit grove. A summary of most investigations is available upon request from the Federal-State Frost Warning Service, Box 1058, Lakeland, Florida. Paper published with permission.

scholarly journals Thermal Effects of Crevassing on Steele Glacier, Yukon Territory, Canada

1974 ◽  
Vol 13 (68) ◽  
pp. 243-254 ◽  
Author(s):  
Gary T. Jarvis ◽  
Garry K. C. Clarke
Keyword(s):  
Temperature Profile ◽  
Thermal Effects ◽  
Yukon Territory ◽  
Temperature Measurements ◽  
Temperature Profiles ◽  
Two Dimensional ◽  
Dimensional Model ◽  
Two Dimensional Model ◽  
Made In

Ice temperature measurements have been made in Steele Glacier to a depth of 114 m. All measured temperatures were below 0° C, the coldest being –6.5° C at a depth of 114 m. The temperature profile indicates an anomalously warm layer of ice between 30 m and 50 m, which is probably due to the freezing of water in crevasses opened during the 1965–66 surge. A two-dimensional model of a cold glacier with partially water-filled crevasses predicts temperature profiles very similar to that observed.

scholarly journals The Haemoglobin Concentration of Normal English Males and Females

1933 ◽  
Vol 33 (1) ◽  
pp. 36-41 ◽  
Author(s):  
C. E. Jenkins ◽  
C. S. D. Don
Keyword(s):  
Statistical Significance ◽  
Haemoglobin Concentration ◽  
Gas Analysis ◽  
Experimental Accuracy ◽  
Males And Females ◽  
The Mean ◽  
The Difference ◽  
Made In

The determination of the mean normal haemoglobin concentration has re ceived more attention in America than in this country. Recently Price-Jones (1931) has compared the values in London with those found in America. He used the Haldane haemoglobinometer and his results are as accurate as is possible having regard to the method employed. In America his results were 3 percent. above those of the Haldane gas analysis apparatus (1901) by which theclinical instrument is supposed to be calibrated. Twenty comparisons were made in America and showed that the Haldane gas apparatus gave results averaging 2·6 per cent. below those of the Van Slyke apparatus. Price-Jones considers this to have no statistical significance. From the standpoint of experimental accuracy the difference is appreciable, as all methods for the measurement of oxygen combined with Hb are essentially pragmatic.

Experimental Evaluation of the Hysteretic Damping of Elastomeric Systems at Low-Cyclic Harmonic Kinematic Displacements

2013 ◽  
Vol 430 ◽  
pp. 323-328
Author(s):  
Vasile Ovidiu
Keyword(s):  
Hysteresis Loop ◽  
High Precision ◽  
Experimental Evaluation ◽  
Hysteretic Behavior ◽  
Digital Form ◽  
Hysteretic Damping ◽  
Analogical Representation ◽  
European Standards ◽  
Physical Signal ◽  
Made In

The paper presents the experimental results regarding the hysteretic behavior of elastomeric systems made in conformity with the European Standards SR EN 1337-3 and SR EN 15129. It is also mentioned that the hysteretic damping was determined by experimentally raising the hysteresis loop in a low-cycle harmonic regime, with a kinematic exterior excitation defined by a harmonic displacement law. In this context, it is mentioned that the area of the hysteretic loops was determined instrumentally (in analogical representation of the signals) as well as under digital form, through a sampling of the physical signal, which allows a high precision of the determination.

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