Argon environment

Cyclopropane versus propene branching ratio was analyzed under isolate conditions in the gas phase and under the argon environment with different reduced densities (p ). At a low density (p =0.5), the branching ratio was nearly constant at 0.8-0.85, for the two initial sampling methods, with various bath temperature regions (100-1000 K) for the lower energy trajectories (54.6 kcal mol ). These numbers were similar to those (0.85-0.90) obtained... 

Bhatt RT, Hull DR (1998) Strength-degrading mechanisms for chemically-vapor-deposited SCS-6 silicon carbide fibres in an argon environment. J Am Ceram Soc... 

The entire laser-induced ignition process of RDX in an argon environment has been studied in detail [39,40]. Figure 15 shows the predicted temporal evolution of the temperature field at an incident laser heat flux of 400 W/cm under atmospheric pressure. The initial temperature is 300 K. The interface between the subsurface and gas-phase regions is set to be x = 0, with negative and positive values of the. v-coordinate representing the subsurface and gas phase, respectively. The surface temperature is rapidly increased to 475 K within 1 ms, due to the high intensity of laser heat flux. The profiles for t < 1... 

Sphere-Flat Test Results. Kitscha [47] performed experiments on steady heat conduction through 25.4- and 50.8-mm sphere-flat contacts in an air and argon environment at pressures between 10 5 torr and atmospheric pressure. He obtained vacuum data for the 25.4-mm-diameter smooth sphere in contact with a polished flat having a surface roughness of approximately 0.13 pm RMS. The mechanical load ranged from 16 to 46 N. The mean contact temperature ranged between 321 and 316 K. The harmonic mean thermal conductivity of the sphere-flat contact was found to be 51.5 W/mK. The emissivities of the sphere and flat were estimated to be e, = 0.2 and e2 = 0.8, respectively. 

Of all known normal azides including HN3, fluorine azide appears to be the most sensitive. The greenish-yellow gas was obtained in a nitrogen or argon environment at low temperatures. Slow mixing of diluted (1 200) fluorine and HN3 yielded the azide, apparently according to [334] ... 

The results of the 20-Hz, 10-Hz, and 1-Hz room-temperature tests for an R value of 0.1 are shown in Fig. 4. There did appear to be a frequency effect in the argon environment. This is somewhat surprising, as it is an inert environment for the 3003-0 alloy. As with the air results, the 10-Hz data were close to the 20-Hz results at lower levels and the 1-Hz data at the higher levels. The C and m values for these tests are summarized in Table I. 

Bodet, R., J. Lamon, N. Jia, and R.E. Tressler. 1996. Microstruotural stability and creep behavior of Si-C-O (Nicalon) fibers in carbon monoxide and argon environments. Journal of the American Ceramic Society 79(10) 2673-2686. ... 

Strength. Similar st iarios hold for bond fomiation and the use of an argon environment during heat treatment. Tables III-V. 

Thermogravimetric analysis measurements have also provided information regarding dendrimer decomposition. Thermolysis of G40H dendrimers on a gold surface in both air and argon environments has shown that the greatest weight loss... 

Y2O3 laser ablation plasma in vacuum, oxygen, and argon environments. /, Appl. Phys., 88,1088. 

Li and coworkers [19] investigated the effect of atmosphere on the wear rate. Their observations are presented in Fig. 6.9c. It is clear that at low load (2N), the wear rate of Stellite 21 containing Y in air is lower than the wear rate of the same material in an argon environment. In contrast, the wear rate of Y containing Stellite 21 in an argon atmosphere is lower than the wear rate in air when the applied load is 5 N. It should be stated here that irrespective of the Y content of the wearing material Stellite 21, the mechanical... 

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