Cyclic aging

ASTM D1183-03 Standard test methods for resistance of adhesive to cyclic aging conditions. 

Resistance of Adhesives to Cyclic Aging Conditions, Test for (D1183)... 

Resistance of Adhesives to Cyclic Aging Conditions, Test for (Dll 83) Bonding Permanency of Water- or Solvent-Soluble Dquid Adhesives for Labeling Glass Bottles, Test for (D 1581)... 

Numerous cyclic ageing tests are defined, such as for example VDA cyclic ageing test or P1210 cyclic ageing test. According to the experience of vehicle manufacturers and to the authors experience, the adhesion of elastic bonding... 

Fig. 10. Tensile shear strength of ECA homopolymer after heat aging at IITC with and without cyclic sulfate, 9, on steel lapshears.

Much of the variation in these time series for the past 700 kyr can be described by a combination of a 100 kyr cycle plus additional cycles with periods of 20 and 40 kyr. This result immediately suggests that the ice-age cycles are caused by variations in the amount and seasonality of solar radiation reaching the Earth (insolation), because the 20, 40, and 100 kyr periods of climate history match the periods of cyclic variations in Earth s orbit and axial tilt, line hypothesis that these factors control climate was proposed by Milutin Milankovitch in the early part of the 20th century and is widely known as "Milankovitch Theory." It is now generally accepted that the Milankovitch variations are the root cause of the important 20 and 40 kyr climate cycles. The 100 kyr cycle, however, proves to be a puzzle. The magnitude of the insolation variation at this periodicity is relatively trivial, but the 100 kyr cycle dominates the climate history of the last 700 kyr. Further,... 

Specifically, for women with PCOS, the use of depot and intermittent oral medroxyprogesterone acetate suppresses pituitary gonadotropins and circulating androgens.15 Further, the use of cyclic progesterone may benefit women over age 40 and in whom anovulatory bleeding occurs.11... 

Figure 2.69 Cyclic voltammograms recorded for a 7500A-thick Ni(OH>2 film on a nickel electrode in 8M KOH. Scan rate=lmVs 1, The periods of ageing are shown in hours. Reprinted from Electrochimica Acta, 31, M. Fleischmann, A, Oliver and J. Robinson, tn situ X-ray diffraction studies of the electrode solution interface, pp. 899-906 (1986), with kind permission from Pcrgamon Press Ltd, Headington Hill Hall, Oxford 0X3 OBW, UK,...

Matt, D.M., Sarver, P.L. and Lu, J.K.H. (1987). Relation of parity and estrous cyclicity to the biology of pregnancy in aging female rats. Biol. Reprod. 31 421-430. 

The anions A2H may also be involved. The two forms of propagating centre, (III) and (IV), may well co-exist, their relative kinetic importance depending upon solvent, temperature, concentrations, age of the reaction and - in the general case - the nature of the acid. The transition states for both the reactions (iii) and (iv) can best be visualised as cyclic and 6-centred [2c, 7a, 29]. 

Weathering/Aging - the combined effect of cyclic exposure to varying moisture, temperature and sun exposure, or specific cyclic application conditions such as under the hood grease, oil and temperature variations. 

H.E. Meyer Zu Schwabedissen, M. Grube, B. Heydrich, K. Linnemann, C. Fusch, H.K. Kroemer, and G. Jedlitschky. Expression, localization, and function of MRP5 (ABCC5), a transporter for cyclic nucleotides, in human placenta and cultured human trophoblasts Effects of gestational age and cellular differentiation. Am J Pathol. 166 39 18 (2005). 

The dosage may be gradually titrated upward at 6- to 12-month intervals as needed to achieve appropriate bone age advancement and eventual epiphyseal closure. Chronic dosing with 0.625 mg is sufficient to induce artificial cyclic menses with sequential progestin treatment and to maintain bone mineral density after skeletal maturity is achieved. 

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