The relationship of stress and temperature on high-temperature corrosion fracture mechanism of waspaloy in various catalyst environments

2001 ◽  
Vol 18 (2) ◽  
pp. 107-118 ◽  
Author(s):  
Phillip Dowson ◽  
Charles P. Stinner
Keyword(s):  
High Temperature ◽  
Fracture Mechanism ◽  
High Temperature Corrosion ◽  
Corrosion Fracture ◽  
Relationship Of ◽  
The Relationship

A NOVEL GREEN LONG-LASTING PHOSPHOR Ca2ZnSi2O7:Eu2+

2011 ◽  
Vol 04 (03) ◽  
pp. 289-293 ◽  
Author(s):  
WEI ZENG ◽  
YUHUA WANG ◽  
XUHUI XU ◽  
YU GONG
Keyword(s):  
High Temperature ◽  
Zinc Vacancy ◽  
Solid State Method ◽  
Naked Eye ◽  
State Method ◽  
Relationship Of ◽  
The Relationship ◽  
Fluorescence And Phosphorescence Spectra ◽  
Fluorescence And Phosphorescence ◽  
Phosphorescence Spectra

A new green emitting long-lasting phosphor Ca2ZnSi2O7:Eu2+ has been synthesized through the high temperature solid-state method. The excitation spectrum of [Formula: see text] shows a broadband attributed to 8S7/2–4f65d1 transition of Eu2+ ions. Both of the fluorescence and phosphorescence spectra showed a broadband centered at 528 nm, corresponding the only one Ca2+ site in Ca2ZnSi2O7 . The relationship of emission wavelength and Eu–O distance is investigated. Its afterglow can be seen with the naked eye in the dark clearly for 2 h after removal of the excitation source. Oxygen vacancy [Formula: see text] and zinc vacancy [Formula: see text], two different kinds of traps are proposed and their contrary influence on afterglow is discussed.

Pain and thermal burns in skin areas previously exposed to ultraviolet radiation

1960 ◽  
Vol 15 (3) ◽  
pp. 489-492 ◽  
Author(s):  
Alice M. Stoll ◽  
Leon C. Greene ◽  
James D. Hardy
Keyword(s):  
High Temperature ◽  
Ultraviolet Radiation ◽  
Thermal Radiation ◽  
Pain Threshold ◽  
Reaction Rates ◽  
Threshold Theory ◽  
Relationship Of ◽  
The Relationship ◽  
Skin Temperatures ◽  
Moderately High Temperature

In order to evaluate the relationship of tissue damage to pain sensation in areas of hyperalgesia, the skin of three subjects was irradiated with injurious doses of ultraviolet radiation and then exposed to thermal radiation. Measurements were made of the pain-threshold-lowering effect of the ultraviolet radiation and, following the development of the hyperalgesia, of the lowering of the blister threshold to thermal radiation. Lowering of the pain threshold of 4-7°C was observed, while the lowering of the blister threshold (i.e. the temperature at which blistering was produced) was of the order of 0.5°C. The ultraviolet-irradiated hyperalgesic skin is therefore not more fragile as regards moderately high temperature (50°C) and high temperature burns than is normal undamaged skin. This finding is in keeping with the previously proposed theory that the intensity of pain is a function of the relative reaction rates at the thermal threshold and at skin temperatures above this threshold. Theory predicts, however, that ultraviolet-irradiated skin heated to, and maintained at, relatively low temperatures (40–45°C) will be more easily blistered than will undamaged skin. Submitted on December 30, 1959

The Relationship of “Volcanic Ash,” sak lu'um, and Palygorskite in Northern Yucatan Maya Ceramics

1974 ◽  
Vol 39 (3) ◽  
pp. 483-488 ◽  
Author(s):  
Wayne C. Isphording ◽  
Eugene M. Wilson
Keyword(s):  
High Temperature ◽  
Volcanic Ash ◽  
Marine Waters ◽  
Shallow Marine ◽  
Direct Precipitation ◽  
Indigenous Materials ◽  
Relationship Of ◽  
The Relationship ◽  
White Earth ◽  
Glass Shards

AbstractShepard has described several principal types of temper used in pre-Hispanic ceramics in northern Yucatan. One of these, identified as “volcanic ash,” has long been a mineralogical problem because no unequivocal deposits of volcanic materials are known to exist in the area.The possible indigenous materials that could have been identified as “volcanic ash” have been examined and the conclusion reached that the material in question is the mineral palygorskite. This mineral is widespread in the peninsula and is often associated with the mineral sepiolite. Palygorskite (also known as “attapulgite”) was known to the Maya as sak lu'um (white earth) and has been identified by high temperature studies as a constituent of Mayan ceramicware. Its origin, in Yucatan, is attributed to direct precipitation in shallow marine waters and in hypersaline, fringing lagoons. It is suggested that, unless ceramicware from Yucatan is found that actually contains true volcanic detritus (glass shards, grains of feldspar, amphibole, pyroxene, rutile, zircon, and so forth), reference to “ash temper” be avoided.

scholarly journals Vapor Pressure Deficit, Temperature, and Light Affect Postharvest Drying of Fraser Fir and Eastern White Pine

HortScience ◽  
1991 ◽  
Vol 26 (4) ◽  
pp. 402-405 ◽  
Author(s):  
L.E. Hinesley ◽  
L.K. Snelling
Keyword(s):  
High Temperature ◽  
Vapor Pressure ◽  
White Pine ◽  
Eastern White Pine ◽  
Fraser Fir ◽  
Light Regimes ◽  
Drying Rates ◽  
Relationship Of ◽  
The Relationship ◽  
Needle Water Potential

Branches of Fraser fir [Abies fraseri (Pursh) Poir.] and eastern white pine (Pinus strobus L.) were subjected to various temperatures, vapor pressure deficits (VPD), and light regimes in controlled-environment chambers. Drying rates, based on measurements of needle water potential (ψ), were accelerated by increasing VPD, high temperature, and light. Fraser fir and white pine dried to – 4.0 MPa and – 3.0 MPa, respectively, in about the same time. The relationship of moisture content (MC) to ψ was linear for Fraser fir, quadratic for white pine. The MC of Fraser fir at – 4.0 MPa was also a linear function of VPD during drying. Water loss was greatest early in the drying cycle, and high temperature (25C) promoted rapid drying, even at low VPD.

Electrical Properties of Rutile Single Crystal Irradiated by High-Fluence-Reactor-Neutron

2003 ◽  
Vol 792 ◽  
Author(s):  
Tiecheng Lu ◽  
Libin Lin ◽  
Gang Cheng ◽  
Xuechun Xu ◽  
Chunpei Zhao ◽  
...  
Keyword(s):  
High Temperature ◽  
Electrical Properties ◽  
Low Temperature ◽  
Single Crystal ◽  
Electrical Conductance ◽  
Annealing Atmosphere ◽  
High Fluence ◽  
Relationship Of ◽  
First Time ◽  
The Relationship

ABSTRACTElectrical properties of rutile (TiO2) single crystals irradiated by high-fluence-reactor neutrons have been investigated for the first time. In this paper, the colorless rutile single crystal turns into dark blue after being irradiated by high-fluence-reactor neutrons of 1019/cm2 and its electrical properties change, from high insulator to normal semiconductor. The relationship of sample resistance to temperature (at low temperature, room temperature and high temperature, respectively) and the effect of annealing atmosphere (in air or in vacuum) on the electrical property of the sample have been studied. The results show that the sample has semiconductor properties at low temperature. At high temperature, however, it is oxidized into colorless insulator in air and the activation energy gradual changes due to slow oxidization process. In 10-4 Pa vacuum condition, TiO2 becomes a semiconductor due to the presence of ion defects. The electrical conductance mechanism is also discussed.

The Optimization Design and Research of CX20 Clutch Friction Plate

2014 ◽  
Vol 900 ◽  
pp. 781-786
Author(s):  
Lei Ming Shi ◽  
Shun Li Feng ◽  
Zhi Hong Wang ◽  
Yi Ming Shao ◽  
Xiao Chun Jian
Keyword(s):  
High Temperature ◽  
Optimization Design ◽  
Orthogonal Experiment ◽  
Plate Material ◽  
Friction Heating ◽  
Friction Plate ◽  
Fiber Materials ◽  
The Stability ◽  
Relationship Of ◽  
The Relationship

With the help of the orthogonal experiment and the friction-wear mechanism by car as the research object of the clutch driven platen friction plate of Chongqing Changan CX20 auto power take-off installation, the optimization of clutch friction materials is studied.It was selected for the resin-base fiber materials of clutch driven platen to be commonly used in auto mechanical manufacture. It was analyzed for the abrasion mechanism of the clutch driven platen friction plate between the flywheel and the pressure plate,and discussed for the relationship of driven platen friction-plate heat recession-performance and the driven plate material at high temperature. The results show that the friction factor of the optimized driven platen lining materials do not change. In the process of the frequent friction heating to high temperature, the stability of the optimized driven platen lining materials is strong, the wear of those is reduced, and the optimized driven platen lining materials have good performance of high temperature-thermal recession.

The feldspar phenocrysts of some Tertiary acid glasses

1960 ◽  
Vol 32 (251) ◽  
pp. 587-608 ◽  
Author(s):  
I. S. E. Carmichael
Keyword(s):  
High Temperature ◽  
The Other ◽  
Plagioclase Feldspar ◽  
Relationship Of ◽  
The Relationship ◽  
Acid Melts

SummaryThe feldspar phenocrysts of some British and Icelandic Tertiary acid glasses have been studied optically and chemically. Six new analyses of the feldspar phenocrysts are presented together with an anorthoclase from a glassy pantellerite. The analysed feldspars and all the other feldspar phenocrysts that have been examined show high-temperature optics, and confirm the results of previous investigations of plagioclase feldspar determinative curves. The relationship of the feldspar phenoerysts to the plagioclase components in the analysed residual glasses conforms to the synthetic plagioelase system, and the crystallization of feldspar in natural acid melts is considered.

Numerical Correction High Temperature of Near-Infrared Colorimetry

2011 ◽  
Vol 301-303 ◽  
pp. 1378-1383
Author(s):  
Li Hua Yuan ◽  
Guan Hua Wu ◽  
Ming Li
Keyword(s):  
High Temperature ◽  
Surface Temperature ◽  
Near Infrared ◽  
Least Square Method ◽  
Mathematic Model ◽  
Least Square ◽  
Radiation Pyrometer ◽  
Surface Emissivity ◽  
Relationship Of ◽  
The Relationship

Colorimetry is commonly used to measure the surface temperature as true one when the surface emissivity is constant. That is, the target is regarded as greybody. But in fact, most materials are not greybody. Spectrum emissivity has to do with wavelength and temperature. And in the most case, it is difficult to assure the exact values of the emissivity .This makes the relative error of the temperature big. Therefore, it is necessary to modify the emissivity response of radiation pyrometer. The factor influencing the spectrum was researched through the application of least square method to create the relationship of spectrum emissivity with wavelength and temperature, at last mathematic model was established which provided numerical correction of infrared two-color thermometry.

scholarly journals Structural Relationships in High Temperature Superconductors

1987 ◽  
Vol 01 (03n04) ◽  
pp. 821-828 ◽  
Author(s):  
Ivan K. Schuller ◽  
C.U. Segre ◽  
D.G. Hinks ◽  
J.D. Jorgensen ◽  
L. Soderholm ◽  
...  
Keyword(s):  
High Temperature ◽  
Copper Oxide ◽  
High Temperature Superconductors ◽  
Metallic Copper ◽  
Superconducting Materials ◽  
Superconducting Properties ◽  
Structural Relationships ◽  
Covalently Bonded ◽  
Relationship Of ◽  
The Relationship

The recent discovery of two types of metallic copper oxide compounds which are superconducting to above 90K has renewed interest in the search for new high temperature superconducting materials. It is significant that both classes of compounds, La2−xSrxCuO4−y and YBa2Cu3O7−δ are intimately related to the extensively studied perovskite family. Both compounds contain highly oxidized, covalently bonded Cu-O sublattices, however, they differ in geometry. In this paper we discuss the relationship of these features to the superconducting properties.

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