Application of Ablation to a High Chamber Pressure Rocket Engine

Ablation cooling in rocket engine with combustion chamber liner and nozzle constructed of silica phenolic ablative materia

The Family History of Taylor Brecheisen

Taylor Brecheisen authored this family history as part of the course requirements for HIST 550/700 Your Family in History offered online in Spring 2019 and was submitted to the Pittsburg State University Digital Commons. Please contact the author directly with any questions or comments: [email protected]

Efficient and Effective Similarity Search on Complex Objects

Due to the rapid development of computer technology and new methods for the extraction of data in the last few years, more and more applications of databases have emerged, for which an efficient and effective similarity search is of great importance. Application areas of similarity search include multimedia, computer aided engineering, marketing, image processing and many more. Special interest adheres to the task of finding similar objects in large amounts of data having complex representations. For example, set-valued objects as well as tree or graph structured objects are among these complex object representations. The grouping of similar objects, the so-called clustering, is a fundamental analysis technique, which allows to search through extensive data sets. The goal of this dissertation is to develop new efficient and effective methods for similarity search in large quantities of complex objects. Furthermore, the efficiency of existing density-based clustering algorithms is to be improved when applied to complex objects. The first part of this work motivates the use of vector sets for similarity modeling. For this purpose, a metric distance function is defined, which is suitable for various application ranges, but time-consuming to compute. Therefore, a filter refinement technology is suggested to efficiently process range queries and k-nearest neighbor queries, two basic query types within the field of similarity search. Several filter distances are presented, which approximate the exact object distance and can be computed efficiently. Moreover, a multi-step query processing approach is described, which can be directly integrated into the well-known density-based clustering algorithms DBSCAN and OPTICS. In the second part of this work, new application ranges for density-based hierarchical clustering using OPTICS are discussed. A prototype is introduced, which has been developed for these new application areas and is based on the aforementioned similarity models and accelerated clustering algorithms for complex objects. This prototype facilitates interactive semi-automatic cluster analysis and allows visual search for similar objects in multimedia databases. Another prototype extends these concepts and enables the user to analyze multi-represented and multi-instance data. Finally, the problem of music genre classification is addressed as another application supporting multi-represented and multi-instance data objects. An extensive experimental evaluation examines efficiency and effectiveness of the presented techniques using real-world data and points out advantages in comparison to conventional approaches

Auswirkung der Schlachtung unterschiedlich stark verschmutzter Rinder auf die mikrobiologische Belastung ihrer Schlachtkörper

Hide contamination represents a main source of microbiological contamination of carcass surface. In order to reduce the potential health risks for the consumer the EU implemented measures in the context of the regulations no. 852/-, 853/- and 854/2004. These imply that only clean cattle are suitable for slaughter in order to eliminate the risk of meat contamination via hide or skin. Food business operators are responsible for ensuring that the requirements are met. One problem is, that the meaning of cleanliness is not defined clearly enough. Therefore some European states implemented regulations for the grading of hide cleanliness. The main objective of the own analysis was to point out the correlation between the level of hide contamination and the total bacteria count of the surfaces of the carcasses. Therefore an ascending hide cleanliness classification system for beef cattle was developed which is based on two vertical hide regions, an area measure as well as aspects of cleanliness and humidity based on three major-classes for hide-cleanliness. In total 180 female bovine cattle were classified by their hide, digitally photographed from four perspectives (two standing and two stunned) as well as slaughtered and examined in a group of equal or very similar level of conta- mination on test days. The sampling technique was based on stalked sponge swabs, which were pulled over four exactly defined locations of the freshly flayed carcass twice (front and back side) through a self-developed oblong template measuring 100 cm2. The four incre- mental samples per animal were pooled and tested for the hygiene indicators aerobic colony count as well as for Enterobacteriaceae count and Escherichia coli count. Analyzing the data set statistically all logarithmized aerobic colony counts were normally distributed. Three ordinal scores for aerobic colony count were defined (Score1:0bis≤2log10 cm-2,Score2:2bis≤ 3log10 cm-2 andScore3:>3log10 cm-2) and tested in conjunction with the three major classes of hide contamination. The general finding was that the amount of animals with low total bacteria count (Score 1) decreased with higher major class. The amount of cattle with moderate Summary 119 bacteria content (Score 2) increased slightly with the major class. The amount of animals with high total bacteria count (Score 3) increased substantially with the major class. It could be shown that major-class-I included a statistically significant lower amount of animals with high total bacteria count compared to major-class-II. The same held for the comparison of major-class-II and -III as well as of major- class-I and -III. E. coli and Enterobacteriaceae could be evidenced only on about a third of the carcasses and thus be analyzed in combination with the major-classes and the three Scores. Applying the reduced population respectively the same correlation could be confirmed approximately. Overall the described correlations can be taken as indication that the considered colony counts rise with an increasing visual level of contamination. In case of development and implementation of a regulation system in Germany the application of a maximum of three ascending classes of hide contamination appears to be justifiable. Furthermore the terms „clean“ and „cleanliness“ should be complemented with attributes as „sufficient(ly)“

Auswirkung der Schlachtung unterschiedlich stark verschmutzter Rinder auf die mikrobiologische Belastung ihrer Schlachtkörper

Hide contamination represents a main source of microbiological contamination of carcass surface. In order to reduce the potential health risks for the consumer the EU implemented measures in the context of the regulations no. 852/-, 853/- and 854/2004. These imply that only clean cattle are suitable for slaughter in order to eliminate the risk of meat contamination via hide or skin. Food business operators are responsible for ensuring that the requirements are met. One problem is, that the meaning of cleanliness is not defined clearly enough. Therefore some European states implemented regulations for the grading of hide cleanliness. The main objective of the own analysis was to point out the correlation between the level of hide contamination and the total bacteria count of the surfaces of the carcasses. Therefore an ascending hide cleanliness classification system for beef cattle was developed which is based on two vertical hide regions, an area measure as well as aspects of cleanliness and humidity based on three major-classes for hide-cleanliness. In total 180 female bovine cattle were classified by their hide, digitally photographed from four perspectives (two standing and two stunned) as well as slaughtered and examined in a group of equal or very similar level of conta- mination on test days. The sampling technique was based on stalked sponge swabs, which were pulled over four exactly defined locations of the freshly flayed carcass twice (front and back side) through a self-developed oblong template measuring 100 cm2. The four incre- mental samples per animal were pooled and tested for the hygiene indicators aerobic colony count as well as for Enterobacteriaceae count and Escherichia coli count. Analyzing the data set statistically all logarithmized aerobic colony counts were normally distributed. Three ordinal scores for aerobic colony count were defined (Score1:0bis≤2log10 cm-2,Score2:2bis≤ 3log10 cm-2 andScore3:>3log10 cm-2) and tested in conjunction with the three major classes of hide contamination. The general finding was that the amount of animals with low total bacteria count (Score 1) decreased with higher major class. The amount of cattle with moderate Summary 119 bacteria content (Score 2) increased slightly with the major class. The amount of animals with high total bacteria count (Score 3) increased substantially with the major class. It could be shown that major-class-I included a statistically significant lower amount of animals with high total bacteria count compared to major-class-II. The same held for the comparison of major-class-II and -III as well as of major- class-I and -III. E. coli and Enterobacteriaceae could be evidenced only on about a third of the carcasses and thus be analyzed in combination with the major-classes and the three Scores. Applying the reduced population respectively the same correlation could be confirmed approximately. Overall the described correlations can be taken as indication that the considered colony counts rise with an increasing visual level of contamination. In case of development and implementation of a regulation system in Germany the application of a maximum of three ascending classes of hide contamination appears to be justifiable. Furthermore the terms „clean“ and „cleanliness“ should be complemented with attributes as „sufficient(ly)“

Transpiration cooling of two-dimensional porous bodies using chemically reacting and nonreacting coolants

Call number: LD2668 .T4 1969 B7Master of Scienc

Quantifying Four Decades of Arid-region Agricultural Development in Arequipa, Peru Using Landsat

The Arequipa Nexus Institute for Food, Energy and the Environment (Nexus Institute) is located in Southwestern Peru, generally bounded by the city of Arequipa to the east, the Majes River to the west, the Pacific Ocean to the south, and the Andes mountains to the north. Though agriculture has been practiced in parts of this cool desert region (MAT~15°C, MA

Sustainable Environment: Nexus project

Arequipa region is locaed in Southwestern Peru. The Arequipa Nexus Institute for food, energy, water and the environment aims to address the key challenges to a sustainable furture for the people in the region. This roundtable discusses about the sustainable water management, geosaptial analysis and environment sharing, long range sensor network solution for soil health monitoring and data management and sharing in this Nexus project