The rail deflection, bending moment, and rail seat load are influenced by the track responses. The effect is as: Bending moment reduces. Rail deflection is reduced. Rail seat load reduces.
To study the effect of k and EI on the track responses, such as rail deflection, bending moment, and rail seat load for a two-axle bogie, we use the following information. The wheelbase distance is 2.0 m, and the same axle load is Qi. Effect of increasing the track modulus (k) on bending moment, rail deflection and rail seat load for the two axle load
When we increase the track modulus (k), bending moment and rail deflection decrease. Rail seat load increases when track modulus (k) is increased. Thus, when track modulus (k) is increased to 2k, 4k, and so on, the effect is as follows:Bending moment reduces. Rail deflection is reduced. Rail seat load increases. Effect of increasing the rail bending stiffness (EI) on bending moment, rail deflection and rail seat load for the two axle load
The rail deflection, bending moment, and rail seat load are influenced by an increase in the rail bending stiffness (EI). When the rail bending stiffness (EI) is increased, the bending moment reduces and the rail deflection reduces. When the rail bending stiffness (EI) is increased to 2EI, 4EI, and so on, the effect is as follows: Bending moment reduces. Rail deflection is reduced. Rail seat load reduces.
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This is an excerpt from- Sexual selection and special design authored by Steven W Gangestad, in the Annals New York academy of Science. Answer the questions based on the excerpt provided below. "…..Women claim men’s scent importantly affects their attraction to them. Moreover, evidence suggests that women’s olfaction changes across menstrual cycle. For instance, women tend to rate androstenone, a steroid found in men’s sweat, more positively near ovulation than during non-fertile phases.
In an initial study, we asked 41 men to wear T-shirt for two consecutive nights. During the two-day period, they were to wash only with unscented soap, not to wear any fragrances or colognes, not eat certain strong foods, and not to sleep with another person. They dropped shirts off at our lab on a designated morning. Later that same morning and throughout the next day, women came in, smelled each T-shirt and rated its attractiveness (a composite of two ratings: pleasantness and sexiness). For each woman, we regressed her rating on men’s symmetry to yield "a preference for symmetry" score (the regression slope, a measure of the change in rating as a function of a change in symmetry). We then examined the correlation of these preference scores with women’s estimated fertility based on their self-reported day of the cycle and actuarial data on probability of conception for each day. Across 28 normally ovulating women the correlation was 0.54, p<0.001. Examination of the bivariate plot revealed that when women’s fertility was near zero (very early and late in the cycle), they had no systematic preference for the scent of either symmetrical or asymmetrical men. As their fertility increased, however, they increasingly preferred the scent of symmetrical men.
A subsequent study replicated and extended that result in a larger sample of about 50 normally ovulating women and 80 men. Women’s preference for symmetry correlated 0.42 with their fertility based on the day of their cycle, p<0.001. We asked men how many times they showered and whether they wore any fragrances. The number of times men showered predicted the attractiveness of their scent. When this variable was partialled out and all men who wore fragrances were eliminated from the analysis, the correlation between women’s symmetry and their fertility actually increased, r=0.48, p<0.001. In a third study in our lab, this result was once again replicated, r=0.26, p<0.05. When data from all three studies were pooled, the correlation between women’s preference for symmetry and the fertile phase of their cycle was r=0.40, p<0.0001." [Note: p values reported here means that correlation r is statistically significant]
From this scenario, the immune systems of humans should be exceptionally high. Yet, there is a rising incidence of autoimmune diseases and lack thereof immunity. What form of selection do you think is at play here? Explain.
Autoimmune diseases are rising despite the fact that humans should have exceptionally high immune systems. This can be explained by the fact that sexual selection is at play, leading to a reduction in immune function.
The excerpt explains the correlation between women's preference for symmetry and their fertile phase of their cycle. It is observed that women tend to prefer the scent of symmetrical men as their fertility increases. This indicates that women use scent as a factor in determining mating partners, which is an example of sexual selection.Sexual selection is a special type of natural selection in which individuals with certain traits are more likely than others to obtain mates.
This leads to traits that improve an individual's ability to secure a mate being favored, while traits that do not aid in mate selection are not favored.As a result, it is suggested that sexual selection may have favored traits that lower immune function in order to signal traits related to mate quality. This could explain the rising incidence of autoimmune diseases despite the fact that humans should have exceptionally high immune systems.
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