1,054 research outputs found

    Obituary for Sergej Bagapsh

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    Comparison of operating expenses and capital expenditures of two different types of boiler rooms covering extensions expected during the next twenty years

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    This thesis applies to a central power station located in a rapidly growing manufacturing city with a present population of 40,000. The station is connected by high voltage transmission lines with six hydro and steam generating stations located in other cities. These transmission lines are mainly for emergency purposes so that this report considers that the station here studied will carry its full load. The boiler room is the only part of the station considered in this thesis as a previous study showed that there was ample space in the engine room for turbo-generator for years to come --Introduction, page 1

    The Nub of an Automorphism of a Totally Disconnected, Locally Compact Group

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    To any automorphism, α\alpha, of a totally disconnected, locally compact group, GG, there is associated a compact, α\alpha-stable subgroup of GG, here called the \emph{nub} of α\alpha, on which the action of α\alpha is topologically transitive. Topologically transitive actions of automorphisms of compact groups have been studied extensively in topological dynamics and results obtained transfer, via the nub, to the study of automorphisms of general locally compact groups. A new proof that the contraction group of α\alpha is dense in the nub is given, but it is seen that the two-sided contraction group need not be dense. It is also shown that each pair (G,α)(G,\alpha), with GG compact and α\alpha topologically transitive, is an inverse limit of pairs that have `finite depth' and that analogues of the Schreier Refinement and Jordan-H\"older Theorems hold for pairs with finite depth

    Using Branch-and-Price to Find High Quality Solutions Quickly

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    We develop an exact solution approach for integer programs that produces high- quality solutions quickly by solving well-chosen restrictions of the problem. Column generation is used both for generating these problem restrictions and for producing bounds on the value of an optimal solution to the problem. Obtaining primal solutions by solving problem restrictions also provides an easy way to search for improved solutions in the neighborhood of the current best solution. The overall approach is parallelized and computational experiments demonstrate its efficacy. An application to inventory routing is presented

    The Four-Day School Week: Impact on Student Academic Performance

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    Although the four-day school week originated in 1936, it was not widely implemented until 1973 when there was a need to conserve energy and reduce operating costs. This study investigated how achievement tests scores of schools with a four-day school week compared with schools with a traditional five-day school week. The study focused on student performance in Colorado where 62 school districts operated a four-day school week. The results of the Colorado Student Assessment Program (CSAP) were utilized to examine student performance in reading, writing, and mathematics in grades 3 through 10. While the mean test scores for five-day week schools exceeded those of four-day week schools in 11 of the 12 test comparisons, the differences were slight, with only one area revealing a statistically significant difference. This study concludes that decisions to change to the four-day week should be for reasons other than student academic performance
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