Using Intrinsic Defect Spectra in 4H SiC as Imbedded Thermometers in the Temperature Range from 100°C to 1500°C

2011 ◽  
Vol 679-680 ◽  
pp. 237-240
Author(s):  
Fei Yan ◽  
A. Espenlaub ◽  
Robert P. Devaty ◽  
Takeshi Ohshima ◽  
Wolfgang J. Choyke
Keyword(s):  
Epitaxial Films ◽  
Temperature Measurements ◽  
Intrinsic Defect ◽  
Temperature Range ◽  
Two Temperature ◽  
Better Than

Low doped epitaxial films of 4H SiC irradiated at 1 MeV and electron fluences of 1×1015 cm-2, 3×1015 cm-2 and 1×1016 cm-2 have been used to measure temperatures in two temperature intervals: 580°C to 640°C and 1220°C to 1320°C. Possible accuracy of the temperature measurements is judged to be better than 10 degrees Centigrade. Similar measurements should be possible from 100°C to 1500°C.

Photoluminescence of Ca4Ga2S7:Eu2+ in wide excitation intensity and temperature range

2021 ◽  
pp. 2150392
Author(s):  
B. D. Urmanov ◽  
M. S. Leanenia ◽  
G. P. Yablonskii ◽  
O. B. Taghiyev ◽  
K. O. Taghiyev ◽  
...  
Keyword(s):  
Room Temperature ◽  
Laser Excitation ◽  
Excitation Intensity ◽  
Temperature Measurements ◽  
Constant Time ◽  
Photoluminescence Properties ◽  
Temperature Range ◽  
Chalcogenide Semiconductors ◽  
Time Frames

Photoluminescence properties of [Formula: see text] chalcogenide semiconductors have been studied under the impulse laser excitation in the range of 10–105 W/cm2 at room temperature. This study has shown that as a result of excitation, photoluminescence of [Formula: see text] is characterized by the emission in the interval of 450–575 nm with significant domination in the spectra line at 660 nm. Photoluminescence of [Formula: see text] quenches at wavelengths of 560 nm and 660 nm with constant time frames 258 ns and 326 ns, respectively. Moreover, the temperature measurements of photoluminescence were performed on the samples in the temperature range of 10–300 K.

scholarly journals Thermophysical Properties of 1-Butanol at High Pressures

Energies ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 5046
Author(s):  
Marzena Dzida
Keyword(s):  
Speed Of Sound ◽  
Thermophysical Properties ◽  
High Pressures ◽  
Fuel Additive ◽  
Temperature Range ◽  
Isobaric Thermal Expansion ◽  
Isentropic And Isothermal Compressibilities ◽  
Overlap Method ◽  
Pulse Echo ◽  
Better Than

1-Butanol can be considered as a good fuel additive, which can be used at high pressures. Therefore, the knowledge of high-pressure thermophysical properties is crucial for this application. In this paper, new experimental data on the speed of sound in 1-butanol in the temperature range from 293 to 318 K and at pressures up to 101 MPa are reported. The speed of sound at a frequency of 2 MHz was measured at atmospheric and high pressures using two measuring sets operating on the principle of the pulse–echo–overlap method. The measurement uncertainties were estimated to be better than ±0.5 m·s−1 and ± 1 m·s−1 at atmospheric and high pressures, respectively. Additionally, the density was measured under atmospheric pressure in the temperature range from 293 to 318 K using a vibrating tube densimeter Anton Paar DMA 5000. Using the experimental results, the density and isobaric and isochoric heat capacities, isentropic and isothermal compressibilities, isobaric thermal expansion, and internal pressure were calculated at temperatures from 293 to 318 K and at pressures up to 100 MPa.

Effects of Powder Synthesis Method on the Sinterability of Hydroxyapatite

2011 ◽  
Vol 264-265 ◽  
pp. 1538-1544 ◽  
Author(s):  
K.L. Aw ◽  
R. Tolouei ◽  
Ramesh Singh ◽  
Chou Yong Tan ◽  
Wei Hong Yeo ◽  
...  
Keyword(s):  
Fracture Toughness ◽  
Sintering Temperature ◽  
Synthesis Method ◽  
Theoretical Density ◽  
Wet Chemical Method ◽  
Powder Synthesis ◽  
Temperature Range ◽  
Increasing Trend ◽  
Wet Chemical ◽  
Better Than

The sinterability of hydroxyapatite (HA) powder synthesized through a novel wet chemical method (HAp) and a wet mechanochemical method (HAwm) was investigated over a temperature range of 1000oC to 1400oC in terms of phase stability, bulk density, hardness and fracture toughness. The results indicated that the sinterability of HAp powder were significantly better than HAwm powder. Moreover, the XRD traces of HAwm sintered samples showed signs of decomposition into TTCP when sintered at 1300oC and above. Densification of ~98% of theoretical density was attained by HAp compacts at 1100oC while the HAwm compacts exhibited only ~96% of theoretical density even at 1350oC with no significant increase of density at 1400oC. The Vickers hardness of HAp showed increasing trend for temperature range of 1000oC to 1100oC with the compacts attaining HV of ~7 GPa at 1100oC. Subsequently, the hardness decreased with increasing sintering temperature though the value does not dropped below ~5 GPa. Similarly, HAwm compacts showed an increasing trend from 1000oC to 1300oC with the largest HV attained was ~4.57 GPa. Further increased in sintering temperature resulted in the decreased of Vicker’s hardness. Moreover, the HAp samples reached a maximum fracture toughness of ~0.9 MPam1/2 at 1050oC while the HAwm attained maximum KIc of only ~0.7 MPam1/2 at 1300oC.

A NOTE ON TEMPERATURE MEASUREMENT IN THE BABCOCK TEST CENTRIFUGE

1951 ◽  
Vol 14 (4) ◽  
pp. 137-137
Author(s):  
Lincoln M. Lampert
Keyword(s):  
Temperature Measurement ◽  
Temperature Measurements ◽  
Maximum Temperature ◽  
Temperature Range ◽  
Definite Temperature

Many publications recommend a definite temperature range for the Babcock centrifuge, but do not state how this temperature should be measured, A thermometer placed in the shell of the centrifuge may show a temperature very different from that in the area wherein the bottles are placed. An ordinary six-inch stem, mercury type, maximum recording 0–220° F thermometer, suitably counter-balanced, can be placed in the centrifuge cup to measure the maximum temperature reached during the test. Examples are given of temperature measurements made by this method, compared with those shown by the thermometer regularly used in the centrifuge.

Galvanomagnetic Properties of 3C-SiC/6H-SiC Heterostructures

2008 ◽  
Vol 600-603 ◽  
pp. 541-544
Author(s):  
Alexander A. Lebedev ◽  
Pavel L. Abramov ◽  
Nina V. Agrinskaya ◽  
Ven I. Kozub ◽  
Alexey N. Kuznetsov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Hall Effect ◽  
Epitaxial Films ◽  
Epitaxial Layers ◽  
Temperature Range ◽  
Galvanomagnetic Properties ◽  
Magneto Resistance

3C-SiC epitaxial layers were grown by method of sublimation epitaxy in vacuum on 6HSiC substrates. It was done investigation of magneto resistance and Hall effect of 3C-SiC/6H-SiC heterostructures in temperature range 1,4 – 300 К. At helium temperatures it was founded low samples resistance and negative magneto-resistance in week magnetic field ( ~ 1 T). Analysis of obtained results shows, that low samples resistance can be connected with metal-isolation junction in 3C-SiC epitaxial films..

Growth of Epitaxial a-Axis and c-Axis Oriented Sr2RuO4 Films

1995 ◽  
Vol 401 ◽  
Author(s):  
S. Madhavan ◽  
B. J. Gibbons ◽  
A. Dabkowski ◽  
H. A. Dabkowska ◽  
S. Trolier-Mckinstry ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Epitaxial Films ◽  
Temperature Measurements ◽  
Laser Deposition ◽  
Metallic Films ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oriented Films

AbstractEpitaxial films of Sr2RuO4 have been grown in situ by pulsed laser deposition on (100) LaAlO3 and (100) LaSrGaO4 substrates. X-ray diffraction results show that the films are single domain and grow c-axis oriented on (100) LaAlO3 and a-axis oriented on (100) LaSrGaO4 substrates. X-ray ø-scans indicate epitaxial alignment of the film and substrate in-plane axes in both cases. Resistivity versus temperature measurements reveal that the as-grown c-axis oriented films are semiconducting and the a-axis oriented films are metallic. The metallic films grown so far were found to be non-superconducting down to 50 mK.

scholarly journals Temperature Measurements from Surface Drifters

2010 ◽  
Vol 27 (8) ◽  
pp. 1403-1409 ◽  
Author(s):  
G. Reverdin ◽  
J. Boutin ◽  
N. Martin ◽  
A. Lourenco ◽  
P. Bouruet-Aubertot ◽  
...  
Keyword(s):  
North Atlantic ◽  
Initial Temperature ◽  
North Atlantic Ocean ◽  
Temperature Measurements ◽  
Surface Velocity ◽  
Data Systems ◽  
Accurate Temperature ◽  
Surface Drifters ◽  
Conductivity Cell ◽  
Two Temperature

Abstract The accuracy of temperature measurements from drifters is first examined for 16 drifters (manufactured either by Metocean Data Systems or by Pacific Gyre) deployed with two temperature sensors in the tropical or North Atlantic Ocean. One of these sensors is the SST thermistor commonly used on Surface Velocity Program (SVP) drifters since the late 1980s; whereas the other sensor is a platinum temperature probe associated with a Seabird conductivity cell. The authors find (for 19 separate deployments) an average positive offset of the SST thermistor measurements in 17 out of 19 cases, exceeding 0.1°C in five instances. Among the five drifters that were at sea for a year or more, two present a large trend in this offset (0.10° and −0.10°C yr−1); and in two other cases, there is a clear annual cycle of the offset, suggesting a dependency on temperature. Offsets in 9 out of 12 drifters with sea time longer than 4 months present a negative trend, but the average trend is not significantly different from zero. The study also examined 29 drifters from four manufacturers equipped only with the usual SST thermistor, but for which either a precise initial temperature measurement was available or a float was attached to provide accurate temperature measurements (for a duration on the order of a month). These comparisons often identify SST biases at or soon after deployment. This initial bias is null (or slightly negative) for the set of Clearwater Instrumentation’s drifters, it is very small for two out of three sets of Technocean drifters, and positive for the third one, as well as for the set of Pacific Gyre drifters (on the order of 0.05°C).

Developments in 3 Layer PE Coating for Pipeline Protection

2017 ◽  
Author(s):  
Chanchal Dasgupta
Keyword(s):  
Uv Protection ◽  
Complete Fusion ◽  
Gas Barrier ◽  
Moisture Barrier ◽  
Temperature Range ◽  
Success Stories ◽  
Oil Pipelines ◽  
Outdoor Weathering ◽  
Weathering Resistance ◽  
Better Than

Three Layer Polyethylene (3LPE) coating for onshore pipelines have been used in India since the early 1980’s and have reached a level of maturity. The combination of Gas barrier by FBE layer and moisture barrier with mechanical and UV protection by black PE layer makes it better than either standalone FBE or 2LPE coatings. Further developments in PE materials makes 3LPE coating suitable for a design temperature range of −50°C to +90°C which practically covers all the onshore Oil pipelines in all geographies with excellent outdoor weathering resistance. It has also been possible to provide end-to-end protection with new PO Melt film technology that can give “factory applied” quality girth weld coating on site with complete fusion of girth weld coating with the parent coating, making it a hermetically sealed pipeline. This paper also discusses couple of the failure and success stories of 3LPE coating and their analysis.

Use of CdTe quantum dots for high temperature thermal sensing

RSC Advances ◽  
2014 ◽  
Vol 4 (47) ◽  
pp. 24612-24618 ◽  
Author(s):  
Yangyang Li ◽  
Ben Q. Li
Keyword(s):  
Quantum Dots ◽  
High Temperature ◽  
Cdte Quantum Dots ◽  
Temperature Measurements ◽  
Electromechanical Systems ◽  
High Temperature Range ◽  
Temperature Range ◽  
Thermal Sensing

Thermal sensitive photoluminescence of CdTe quantum dots was used for micro-electromechanical systems temperature measurements in the high temperature range.

Sign in / Sign up

Export Citation Format

Share Document