A catalogue of three-level regular fractional factorial by Hongquan Xu

Nonfiction 1

By Hongquan Xu

A typical challenge that experimenters face is the alternative of fractional factorial designs. minimal aberration designs are universal in perform. There are events within which different designs meet functional wishes larger. a listing of designs could support experimenters pick out the simplest layout. in accordance with coding conception, new tools are proposed to categorise and rank fractional factorial designs successfully. we now have thoroughly enumerated all 27 and 81-run designs, 243-run designs of solution IV or larger, and 729-run designs of solution V or greater. a suite of beneficial fractional factorial designs with 27, eighty one, 243 and 729 runs is given. This extends the paintings of Chen, sunlight and Wu (1993), who gave a set of fractional factorial designs with sixteen, 27, 32 and sixty four runs.

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It is thus customary to evaluate calf mortality rate by the age of five years. In the captive population it is currently irrelevant to talk about inter-birth interval as many females bear only a single calf over their reproductive lifespan, if they get pregnant at all. In recent years, the North American Species Survival Plan (SSP) and the European Endangered Species Program (EEP) have devised elephant reproduction programs for their respective participating zoological institutions. The inception of these programs and the efforts invested towards increased breeding in the captive populations are evidently bearing fruits.

In the Myanmar working elephants, stillbirths are more evenly distributed so that in each age group between 15 and 40 years old, only 10 to 20% of the births are stillbirth (Mar 2002). Stress may also contribute to the rate of stillbirths as the elephant is known to be able to cease all labor activity at will due to stress, pain or other disturbances (Hermes et al. 2008) and such cessation may compromise calf well-being and survival. A second very important infant mortality issue in zoo elephants is infanticide.

05). 05) (Schwammer and Fruehwirth 2011). Even if these secondary sex ratio shifts are merely numerical, and certainly when they are statistically significant, the end result is that the ratio of males in the population gradually increases, resulting in a two-fold problem. When fewer females are produced or survive, there will be fewer females to replace the aging female population and thus it is possible that fewer calves will be produced in the future, leading to a decline in population size.

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