Effects of fertilization with diammonium phosphate on growth and foliar N and P concentrations of 1-0 Quercus alba seedlings were evaluated one year after planting and fertilization. Soil P tests were made by three methods: dilute acid extractable P (Mehlich), acid flouride extractable P (Bray no. 1), and total P by perchloric acid digestion. Correlation analyses were performed on seedling growth, foliar P content, and soil P tests. Confounding factors, including site variation, seedling stress resulting from planting, and an equilibration period of only one growing season, suggest that first-year results are inconclusive. Site factors were the most common source of variation for growth and soil P measurements. Dilute acid extractable P was significantly correlated with height growth. Correlations of first-year responses may be obscured by factors discussed. / Master of Science

No description available.

The purpose of this investigation was to study three classes of sequencing rules in a simulated Job Shop. A computer program simulating the Job Shop was developed to provide an experimental base from which the behavior of the Shop could be observed. In the simulated Job Shop, three sequencing rules, one from each class, were tested. The sequencing rules used were First Come First Serve (FCFS), Shortest Processing Time (SPT), and Probability Sequencing (PS). Due date performance, number of jobs processed in a simulated interval, number of jobs late, mean lateness and in-process inventory level were the measures of performance used. The results indicated that at low traffic density there was no appreciable difference among the measures of performance for the three sequencing rules. At high traffic density SPT had the lowest inventory level but its mean lateness was larger than That of FCFS even Though its number of jobs late was smaller. The performance of FCFS and SPT did not change with changes in allowed flow time but for PS the in-process inventory level increased with decreasing allowed flow time and The number of jobs processed decreased with decreasing allowed flow time. / Master of Science

It was found that the systems analysis technique is a useful tool for hydrologic systems and is not only applicable to artificial hydrologic systems but also to natural catchments. The general equation describing the relationship between surface runoff and rainfall excess of a hydrologic system is a second order nonlinear equation. The damping coefficient for hydrologic systems is approximately unity and the other parameters in the transfer function (Eq. 5-4) such as the time constant and the nonlinear parameter depend on basin characteristics and input intensity. / Ph. D.

The unexpected monoamine oxidase (MAO) substrate properties of 1-cyclopropyl-4-substituted-1 ,2,3,6-tetrahydropyridines have been interpreted in terms of partitioning of these tertiary cyclic allylamines between substrate turnover and ring opening inactivation processes. To evaluate further this proposal, we examined the bioactivities of the related saturated analogs. Several 1,4-disubstituted piperidine derivatives were synthesized and their interactions with MAO-A and MAO-B were characterized. These compounds displayed poor substrate properties toward MAO-A and MAO-B and led to the expected α-carbon oxidized metabolites which were fully characterized. Both the N-methyl and N-cyclopropyl derivatives were good inactivators of MAO-B, suggesting that some species other than the radical resulting from cyclopropyl ring opening is responsible for the inactivation. Both the N-methyl and N-cyclopropyl derivatives also inactivated MAO-A. In this instance, the N-cyclopropyl analogs were much more potent inactivators than the N-methyl analogs. These results suggest that the radical derived from cyclopropyl ring opening may be involved in this inactivation process. The MAO substrate/inactivator properties of these piperidine analogs are discussed in terms of current proposed mechanisms for the MAO catalyzed oxidation of amines. / Master of Science

The thesis deals with the design of technology for production of weapon conclusion by die forging. The weapon conclusion will be made of C45 steel in series of 500 000 pieces per year. Before forging, the base semi-finished product will be treated using cross-wedge rolling technology. Thanks to the chosen production process, the forging will be made as four pieces. A simulation of the forging process was made for the created design. Results of a simulation showed that metal did not fill entire hollow. Based on these results was made changes in design and the simulation was performed again. According to the results of the second simulation, the hollow has already been filled with metal. For the forging was chosen the machine LZK 2500P from Šmeral a.s with a nominal force 25MN. In the conclusion there was a technical-economic evaluation of costs for the material required for production of entire series.

We specify a class of non-linear and non-Gaussian models for which we estimate and forecast the conditional distributions with daily frequency. We use these forecasts to calculate VaR measures for three different equity markets (US, GB and Japan). These forecasts are evaluated on the basis of different statistical performance measures as well as on the basis of their economic costs that go along with the forecasted capital requirements. The results indicate that different performance measures generate different rankings of the models even within one financial market. We also find that for the three markets the improvement in the forecast by non-linear models over linear ones is negligible, while non-gaussian models significantly dominate the gaussian models. / Series: Report Series SFB "Adaptive Information Systems and Modelling in Economics and Management Science"

Communication through text messaging, SMS (Short Message Service), is nowadays a huge industry with billions of active users. Because of the huge userbase it has attracted many companies trying to market themselves through unsolicited messages in this medium in the same way as was previously done through email. This is such a common phenomenon that SMS spam has now become a plague in many countries. This report evaluates several established machine learning algorithms to see how well they can be applied to the problem of filtering unsolicited SMS messages. Each filter is mainly evaluated by analyzing the accuracy of the filters on stored message data. The report also discusses and compares requirements for hardware versus performance measured by how many messages that can be evaluated in a fixed amount of time. The results from the evaluation shows that a decision tree filter is the best choice of the filters evaluated. It has the highest accuracy as well as a high enough process rate of messages to be applicable. The decision tree filter which was found to be the most suitable for the task in this environment has been implemented. The accuracy in this new implementation is shown to be as high as the implementation used for the evaluation of this filter. Though the decision tree filter is shown to be the best choice of the filters evaluated it turned out the accuracy is not high enough to meet the specified requirements. It however shows promising results for further testing in this area by using improved methods on the best performing algorithms.

Dans ce travail de thèse, une amélioration aussi bien à l'échelle globale qu'à l'échelle locale a été apportée sur la compréhension des mécanismes tribologiques aux interfaces outil-pièce-copeau durant l'usinage à sec de l'acier C45 avec des outils en carbure de tungstène revêtus en TIN. Dans une première partie expérimentale, des essais de frottement ont permis d'étudier la sensibilité des paramètres de frottement sur le comportement tribologique aux interfaces pion-pièce. Ainsi, l'évolution du coefficient de frottement, du flux de chaleur et du coefficient de partage de chaleur aux interfaces outil-pièce-copeau ont été identifiés pour le couple de matériau frottant et frotté. Pour mieux comprendre ces phénomènes, une étude métallographique a été effectuée sur des échantillons. Elle a notamment permis l'obtention des transformations métallurgiques au niveau de la surface superficielle de la pièce : des affinements des grains (déformation plastique) aux basses vitesses de frottement et des couches blanches (durcissement thermique) pour les grandes vitesses. Pour avoir plus de détails, un modèle numérique simulant l'essai de frottement a été développé en se basant sur l'approche Arbitraire Lagrangienne Eulérienne (A.L.E). Ce modèle nous a permis d'avoir plus d'informations sur les grandeurs locales de frottement (pression de contact, température de contact, vitesse locale de glissement, déformation plastique). Un modèle de frottement et un modèle de coefficient de partage de chaleur ont été identifiés à travers cette étude numérique. Dans la deuxième partie expérimentale, deux types d'essais d'usure ont été effectués dans des conditions similaires sur des pions et sur des plaquettes d'outils de coupe de même nuance. Des analyses microscopiques et au MEB couplés à une analyse EDS ont été faites afin de mieux analyser les mécanismes tribologiques durant les essais d'usure. Des similitudes de faciès d'usure ont été observées à différentes échelles d'analyse, sur les pions ainsi que sur les plaquettes d'outils de coupe. Ces similitudes ont permis d'aboutir à une corrélation des phénomènes tribologiques observés sur les pions et ceux observés sur les plaquettes.

Mothercraft, or Nutritional Rehabilitation, Centers have been instituted throughout the Third World, in order to alleviate malnutrition in preschool populations. Analysis of Centers, however, is complicated by problems with evaluative methods. There is controversy over the best measure of a child's nutritional status, while confusion has also arisen from the use of static methods for dynamic data. And this author noted that maintenance of any certain Percent Standard Weight (PSW) is often wrongly interpreted as a 100 Percent Standard Weight Gain. From 1964 through 1969, when the Center in Fond Parisien was operating, agricultural improvement programs were also being conducted there. Improvements seen in the nutritional survey could not, therefore, be credited to any single program. The community child health survey indicated that the health of the preschool children who never attended the Center worsened during this period. But both surveys were subject to sampling bias, and no clear conclusions could be drawn. Fond Parisien Center data indicated initial age and PSW as statistically significant influences on the percentage points a child gained in his PSW (percent gain). Regression equations based on these two variables were found to predict the percent gain after three and four months in the Center. Indications from this data are that most children do not profit in their percent gain from a fourth month in the Center. Follow-up data was inconclusive. Comparisons between non-Center and Center children indicated no long-term benefits of the Center. Detailed long-range study of a few Centers is needed. / Master of Science