Heats of vaporization of five polynuclear aromatic compounds at elevated temperatures

1981 ◽  
Vol 26 (1) ◽  
pp. 11-13 ◽  
Author(s):  
Stefan A. Wieczorek ◽  
Riki Kobayashi
Keyword(s):  
Aromatic Compounds ◽  
Elevated Temperatures ◽  
Heats Of Vaporization

Pyrolysis Products of Lignin at Different Temperature Detected by Py-GC-MS

2013 ◽  
Vol 663 ◽  
pp. 392-396 ◽  
Author(s):  
Yin Xuan Fu ◽  
Hai Bin Zhu ◽  
Yan Zhi Sun ◽  
Yong Mei Chen ◽  
Ping Yu Wan
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Aromatic Compounds ◽  
Elevated Temperatures ◽  
Gas Chromatography Mass Spectrometry ◽  
Efficient Utilization ◽  
Pyrolysis Gas ◽  
Pyrolysis Products ◽  
Pyrolysis Gas Chromatography ◽  
Methoxy Groups

Pyrolyzation of lignin to aromatic compounds with small molecule weight is one of the ways to efficient utilization of lignin resource. Basing on the data of thermogravimetric scanning curve (TG-DTG) and pyrolysis-gas chromatography -mass spectrometry (Py-GC-MS), the change in the distribution of pyrolysis products at different temperature was analyzed. The results showed that lignin could produce a large number of aromatic compounds having hydroxy or methoxy groups under the conditions of anaerobic and 250-450°C, but it was not benefit to obtain useful organic compounds when pyrolyzed at elevated temperatures.

Protium–deuterium exchange of cyclic and acyclic alkenes in dilute acid medium at elevated temperatures

1985 ◽  
Vol 63 (2) ◽  
pp. 530-533 ◽  
Author(s):  
Nick Henry Werstiuk ◽  
George Timmins
Keyword(s):  
High Temperature ◽  
Acid Medium ◽  
Aromatic Compounds ◽  
Elevated Temperatures ◽  
Deuterium Exchange ◽  
Dilute Acid ◽  
Deuterium Labelling ◽  
Excellent Yield

A modification of the high temperature – dilute acid (HTDA) method for deuterium labelling of aromatic compounds has been applied to the H–D exchange of a number of cyclic and acyclic alkenes. Cyclopentene, cyclohexene, cyclododecene, and tetramethylethylene have been completely exchanged in excellent yield. 1-Methylcyclopentene and 1-methylcyclohexene have also been perdeuterated and cycloheptene and cyclooctene partially labelled but require spinning band distillation or preparative glpc for separation from rearrangement products. A variety of C5–C8 acyclic alkenes have also been treated under HTDA conditions.

Characterization of Rare-Earth Fluoride Anti-Stokes Phosphors by Scanning arid Transmission Electron Microscopy

1971 ◽  
Vol 29 ◽  
pp. 142-143
Author(s):  
N. M. P. Low ◽  
L. E. Brosselard
Keyword(s):  
Electron Microscopy ◽  
Rare Earth ◽  
Elevated Temperatures ◽  
Stoichiometric Composition ◽  
Rare Earth Ions ◽  
Crystalline Solid ◽  
Precipitation Process ◽  
Rare Earth Fluoride ◽  
Earth Fluoride ◽  
Rare Earth Fluorides

There has been considerable interest over the past several years in materials capable of converting infrared radiation to visible light by means of sequential excitation in two or more steps. Several rare-earth trifluorides (LaF3, YF3, GdF3, and LuF3) containing a small amount of other trivalent rare-earth ions (Yb3+ and Er3+, or Ho3+, or Tm3+) have been found to exhibit such phenomenon. The methods of preparation of these rare-earth fluorides in the crystalline solid form generally involve a co-precipitation process and a subsequent solid state reaction at elevated temperatures. This investigation was undertaken to examine the morphological features of both the precipitated and the thermally treated fluoride powders by both transmission and scanning electron microscopy.Rare-earth oxides of stoichiometric composition were dissolved in nitric acid and the mixed rare-earth fluoride was then coprecipitated out as fine granules by the addition of excess hydrofluoric acid. The precipitated rare-earth fluorides were washed with water, separated from the aqueous solution, and oven-dried.

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Voids in Irradiated Tungsten and Molybdenum

1969 ◽  
Vol 27 ◽  
pp. 190-191
Author(s):  
Robert C. Rau ◽  
Robert L. Ladd
Keyword(s):  
Melting Point ◽  
Fast Neutron ◽  
Neutron Irradiation ◽  
Elevated Temperatures ◽  
Irradiation Temperature ◽  
The Body ◽  
Face Centered Cubic ◽  
Body Centered Cubic ◽  
Cubic Metals ◽  
Face Centered

Recent studies have shown the presence of voids in several face-centered cubic metals after neutron irradiation at elevated temperatures. These voids were found when the irradiation temperature was above 0.3 Tm where Tm is the absolute melting point, and were ascribed to the agglomeration of lattice vacancies resulting from fast neutron generated displacement cascades. The present paper reports the existence of similar voids in the body-centered cubic metals tungsten and molybdenum.

Mechanical Properties and Dislocation Structure of Single Crystal Cdte Deformed in Compression at 300°C

1976 ◽  
Vol 34 ◽  
pp. 592-593
Author(s):  
Ernest L. Hall ◽  
J. B. Vander Sande
Keyword(s):  
Mechanical Properties ◽  
Single Crystal ◽  
Dislocation Structure ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Strain Curve ◽  
Optical Devices ◽  
Semiconductor Compound ◽  
Wide Range ◽  
Sample Orientation

The present paper describes research on the mechanical properties and related dislocation structure of CdTe, a II-VI semiconductor compound with a wide range of uses in electrical and optical devices. At room temperature CdTe exhibits little plasticity and at the same time relatively low strength and hardness. The mechanical behavior of CdTe was examined at elevated temperatures with the goal of understanding plastic flow in this material and eventually improving the room temperature properties. Several samples of single crystal CdTe of identical size and crystallographic orientation were deformed in compression at 300°C to various levels of total strain. A resolved shear stress vs. compressive glide strain curve (Figure la) was derived from the results of the tests and the knowledge of the sample orientation.

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