Discharges, chemical physics

The Clean Water Act strives to restore and maintain the chemical, physical, and biological integrity of the nation s water. The act sets up a system of water quality standards, discharge limitations, and permits. If a project may result in the... 

After lapping, the sliders will be cleaned, and then a passivation film of diamond-like carbon (DLC) will be deposited on the surfaces of sliders through chemical vapor deposition (CVD) to protect the pole area from chemical-physical corrosion and electrostatic discharge attack. Corrosion in pole areas will result in loss of read/write functions. A corrosion test was taken to examine the ability of the sliders polished by different slurries as shown in Table 6. It can be seen that the MRR change rate of the sliders polished by UFD slurry is much less than that polished by the slurry T5qre III, that is, the capability of anti-corrosion of the former is much better than that of the latter. 

CASRN 75-18-3 molecular formula C2H6S FW 62.14 Chemical/Physical MacLeod et al. (1984) studied the reaction of hydroxyl radicals ( limiting reagent ) with dimethyl sulfide in a discharge flow reactor. The rate constants for this reaction were 9.2 x 10 and 7.8 x 10 cm /molecule-sec at 100 and 300 °C, respectively. 

Shahin, M.M. (1966) Mass-spectrometric studies of corona discharges in air at atmospheric pressure. Journal of Chemical Physics, 45, 2600-5. 

Synthesis of metallic nanoparticles proceeds in many ways they can be divided into physical and chemical. Physical methods include inert gas condensation, arc discharge, ion sputtering, and laser ablation. The main idea behind these methods is condensation of solid particles from the gas phase, the substrate for nanoparticle generation being pure metals (or their mixtures/alloys in the case of complex particle composition). Chemical methods, in turn, include various methods utilizing... 

As mentioned earlier, the 1972 Clean Water Act declared as its objective the restoration and maintenance of the chemical, physical, and biological integrity of the nation s waters. To achieve this objective, the Act assumes that all discharges into the nation s waters are unlawful, except as authorized by a permit. Several sections of the Act require permits and licenses Sections 402, 404, 405, 403, and 401. Whereas some of these sections will be specifically addressed and explained in the following, the others will not. 

A best process to achieve a goal, as indicated by the above examples, is a combination of many factors including the type of electrical discharge, chemical and physical properties of the substrate, size and shape of the substrate, and ultimately... 

The over-all results in radiation chemistry can be expected to differ from those in discharge chemistry because of two essentially different groups of facts, namely those associated with the initial physical aspects and those associated with what, for convenience, we hereinafter call chemical physics, namely those processes in the exposed material which involve the actual production and distribution of different excited states. The classes of effects are summarized in Tables I and II. 

Finally, there is one additional respect in which the chemical physics of radiation chemistry differs from that of discharge chemistry. The probability, in radiation chemistry, that a molecule may suffer a second interaction or that a product from a molecule which has been decomposed may itself be acted upon by an exciting species is extremly small—except in cases where the radiation is so intense that it is hardly of present theoretical or experimental interest. In discharge chemistry, the probability of such processes is very high indeed. Thus, the effect of successive excitations must be considered and it must also be considered possible... 

Vasilets, VN. (2005), Modification of Physical Chemical and Biological Properties of Polymer Materials Using Gas-Discharge Plasma and Vacuum Ultraviolet Radiation, Dr. Sci. Dissertation, Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Moscow. 

Thus over the course of half a century, the basic concepts of activated adsorption and active centers were made more precise by application of novel techniques In addition to the direct line work on catalysis, many scientific side lines were pursued photochemistry, discharge tube chemistry, radiation induced transformation, solid state chemical physics, and chemotherapy of cancer (113)... 

---