No description available.

No description available.

M.S.

Isotopic abundances of the elements xenon, cesium, barium, cerium, neodymium, samarium, rubidium and strontium formed in the fast (fission spectrum) neutron fission of u^238 have been measured using the mass spectrometric method. These ratios were normalized 'With respect to each other through isobaric nuclides and isotope dilution to obtain the relative yields of isobaric chains in the heavy mass region. By normalizing the heavy mass yields to 100%, the absolute fission yields of twenty-one isobaric Chains in the 130 - 154 mass range were determined. The origin of the fine structure in the cumulative yield versus mass curve is discussed. It has been concluded that, while most of the fine structure arises from the variation in neutron emission probabilities, some of it could be the result of the shell effect in the fission process itself. / Thesis / Doctor of Philosophy (PhD)

<p> In the field of communications electronic plug-in units operating together form a system. In the event of failure a plug-in unit can easily be replaced by another. Each unit consists of electronic components soldered onto a board in a particular pattern. A component may be either a single electronic part such as a transistor or a combination of single parts such as an integrated circuit. Electronic components with similar properties have been grouped into families. This reduces the number of parameters to be estimated from the observations available.</p> <p> The method of maximum likelihood is used to estimate the failure rates of component families. The number of unit failures and the number of units in use observed during measured periods of time and the component family makeup of the observed units are used to make the estimates.</p> <p> The probability of an electronic component from a given component from a given family being acceptable after the production process will be referred to as the component yield for that family. Similarly, the probability of a given type of unit being acceptable after the production process will be referred to as the yield for that type of unit. By taking the logarithms of the yields, the estimation problem can be reduced to the linear problem of estimating logarithms of component family yields. Using unit yields, the total number of each type of unit produced, and the component family makeup of those units produced, component family yields are estimated. The method of maximum likelihood is applied directly to the data and the method of weighted least squares is applied to the linearized problem.</p> / Thesis / Master of Science (MSc)

No description available.

No description available.

No description available.

No description available.

No description available.