Aging time effect

Fig. 3. Network density versus ageing time—effect of unsaturation. Formulation of sulphur-cured gum vulcanisate (parts by weight) Rubber, 100 ZnO, 5 stearic acid, 1 MBTS, 1 TDEDC, 2 sulphur, 1-5. Cured for 20min at 145°C.

An example of the time effects in irreversible adsorption of a surfactant system is shown in Fig. XI-8 for barium dinonylnapthalene sulfonate (an oil additive) adsorbing on Ti02 (anatase). Adsorption was ineversible for aged systems, but much less so for those equilibrating for a short time. The adsorption of aqueous methylene blue (note Section XI-4) on TiOi (anatase) was also irreversible [128]. In these situations it seems necessary to postulate at least a two-stage sequence, such as... 

Aging The effect of exposure of plastics to the environment for a length of time. The specific effect and degree depend on the moisture in, and temperature and composition of the environment, in addition to the length of exposure. 

In conclusion, the different thermal histories imposed to PTEB have a minor effect on the /3 and y relaxations, while the a. transition is greatly dependent on the annealing of the samples, being considerably more intense and narrower for the specimen freshly quenched from the melt, which exhibits only a liquid crystalline order. The increase of the storage modulus produced by the aging process confirms the dynamic mechanical results obtained for PDEB [24], a polyester of the same series, as well as the micro-hardness increase [22] (a direct consequence of the modulus rise) with the aging time. 

BMI 19.8-36.0 kg m-2) were studied. All transit variables were unaffected by gender. The older subjects had a slower mean colonic transit time of radiolabeled plastic particles than the young subjects (p < 0.05), while BMI affected the gastric emptying of fiber but not other gastrointestinal variables [22]. In a more recent study, comparison was made between cohorts of young and elderly males, but no age-related effect could be determined [23]. 

Tab. 13.1 Effect of synthesis parameters, aging time, reaction temperature, and concentration of metal ions, upon the particle size of the LDHs.

Agonist/antagonist effects on serotonin receptors Time-dependent increases/decreases on dopamine and norepinephrine Age-dependent effects on MAO Increased firing of locus coeruleus neurons... 

Patients more than 12 years of age - The effective dose is 900 to 1800 mg/day in divided doses (3 times/day) using 300 or 400 mg capsules or 600 or 800 mg tablets. The starting dose is 300 mg 3 times/day. If necessary, the dose may be increased using 300 or 400 mg capsules or 600 or 800 mg tablets 3 times/day up to 1800 mg/day. Dosages up to 2400 mg/day have been well tolerated in long-term clinical studies. Doses of 3600 mg/day also have been administered to a small number of patients for a relatively short duration, and have been well tolerated. The maximum time between doses in the 3 times/day schedule should not exceed 12 hours. 

When a new piece of a tree or a coral grows, it takes carbon (including from the atmosphere or ocean. The concentration of a tree takes in is smaller than that in the atmosphere on a per-gram of carbon basis, because of carbon isotope fractionation. In age calculation, this effect has to be accounted for. Once the piece of the tree stops exchanging carbon with the atmosphere, simply decays away (Figure 5-1). Hence, from the measured concentration in the piece of the tree at present, the age (time elapsed since the piece stopped exchange with the atmosphere) can be calculated using Equation 5-11 ... 

A more quantitative study has been performed [57] by considering the temperature dependence of the strain of yielding for the occurrence of SDZs and crazes. The effects of ageing time at 130 °C and of MW were also considered. The results are shown in Fig. 78. 

Intergranular stress-corrosion cracking (IG-SCC) can occur in some sensitized materials when placed under tensile stress. Thus DL-EPR has been used to study the effects of aging time on the susceptibility of Alloy 600 to IGSCC, as shown in Fig. 41 (39). This work also shows the need to modify the experimental parameters of the test to achieve optimal correlation for alloys other than Type 304SS, in this case lowering the KCNS concentration and the temperature while raising the peak potential and the scan rate. 

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