The non-secular behaviour discussed by Luo et al. (2016) occurs in systems in which the mass of the outer star is comparable or larger than that of the inner binary, and in which the octupole term is important ((vert epsilon_{mathrm{oct}} vert gtrsim0.05)).
The secular variation behaviour of the horizontal component (H) from 2006 till 2014 can be seen in Fig. 4.
An analysis of Fig. 4 reveals almost similar secular variation behaviour at both HER and HBK for the Z component around 2014.
However, from Fig. 1 it is obvious that a certain amount of scatter due to leakage of external fields is still present, but it had no influence on the morphology of the secular variation behaviour.
In this investigation, the focus is placed exclusively on the secular variation behaviour of X, Y and Z components around 2014 in Southern Africa, a region where rapid changes in the geomagnetic field are taking place at the moment.
Accurate assessment of physical activity levels is important to understand the association between physical activity and health, but also to monitor secular trends in behaviour and to evaluate the effectiveness of interventions and programs [ 1].
It was beyond the scope of this study to examine in detail the reasons for self reported secular changes in sexual behaviour over 30 years.
We examined secular trends in sexual behaviour (intercourse, age at sexual debut, sexual satisfaction, some sexual dysfunctions) and attitudes to sexuality in later life among four samples representative of the general population of 70 year olds from Gothenburg, Sweden, who were examined using identical methods in 1971-2, 1992-3, 1992000-1nd 2000-1.
A limitation of this approach is that for each individual, the pre-ART period will always be earlier than their post-ART period, and thus, any secular changes in sexual behaviours during the period of study might erroneously be interpreted as an impact of ART.
The effect of temporal damping is visible in the smooth, monotonically decreasing behaviour of the higher-degree secular variation and secular acceleration power.
But it "should be careful not to overestimate its possibilities".Mr Erdogan's secular critics argue that his behaviour points to another troubling impulse: to lead an arc of Sunni Muslim countries spanning Africa, Asia, the Balkans and the Middle East.
