Temperature maturing

Temperature, maturing— The temperature, for a given time and bonding procedure, which produces required characteristics in components bonded with ceramic adhesives. 

Temperature, maturing n. The temperature, as a function of time and bonding condition, which produces desired characteristics in bonded components. Note— The term is specific for ceramic adhesives. 

This work leads to the conclusion that using low reactants concentrations is impoitant to get a support with a high surface area. The total porous volume is not significantly influenced by the preparation conditions studied However it possible to get a mesoporous support by choosing low reactants concentrations, high reaction and maturation temperature, maturation time and and addition rate. This corresponds to S2 which has a 110 m /g specific surface, 50% of the porous volume provided by pores of Dp>20 nm and 18% by pores of Dp in the range 5 to 20 run. The reproducibility of the preparation procedure is excellent. 

Several conditions need to be satisfied for the existence of a hydrocarbon accumulation, as indicated in Figure 2.1. The first of these is an area in which a suitable sequence of rocks has accumulated over geologic time, the sedimentary basin. Within that sequence there needs to be a high content of organic matter, the source rock. Through elevated temperatures and pressures these rocks must have reached maturation, the condition at which hydrocarbons are expelled from the source rock. 

The most important factor for maturation and hydrocarbon type is therefore heat. The increase of temperature with depth is dependent on the geothermal gradient which varies from basin to basin An average value is about 3°C per 100 meters of depth. 

These systems have been operated in extremely low quality (and radioactivity contaminated) industrial environments for the past several years without any major equipment or component failures. Utilizing specialized operating/warm-up procedures, they have operated in low grade, out-of-doors, dust ridden, rain-soaked, industrial environments at temperature ranges which greatly exceed the original equipment manufacturers (OEM) specified limits. The systems have been successfully operated at ambient temperatures of minus 10 to plus 103 degrees Fahrenheit without any pre-mature or un-anticipated equipment failures. 

The mature Haber-Bosch technology is unlikely to change substantiaHy in the foreseeable future. The centers for commercial ammonia production may, however, relocate to sites where large quantities of natural gas are flared from cmde oil production, eg, Saudi Arabia or Venezuela. Relocation would not offset the problems for agriculture of high transportation and storage costs for ammonia production and distribution. Whereas the development of improved lower temperature and pressure catalysts is feasible, none is on the horizon as of this writing. 

Transparent yeUow pigment is composed of needle particles of EeO(OH) having a thickness of 2—5 nm, a width of 10—20 nm, and a length of 50—100 nm. They are prepared by the precipitation process from a very diluted solution of ferrous salt, eg, 6 wt % ferrous sulfate, foUowed by the oxidation of the precipitate with atmospheric oxygen at a temperature of less than 25°C. The precipitate is left to mature for about one day, then filtered, dried, and milled. 

Within each type of distilled spidts, wide vadations of flavor can be achieved by the type and amount of starting grains or other fermentable matedals, methods of preparation, types of yeasts, fermentation conditions, distillation process, maturation time and temperature, blending, and use of new technologies such as membrane separation. 

Fish gonadal recrudescence assay effects on light and temperature sensitive sexual maturation. 

Maturation as a technology does not mean that advancement and innovation has ceased. Adhesive bonding is so essential to the aerospace field that as long as there is a desire to go higher, faster and farther more efficiently, there will be an incentive to develop new materials and processes for adhesive bonding. Areas of particular interest for future applications are high-temperature adhesives, fiber-reinforced metal laminates and more efficient bond assembly techniques. 

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