No description available.

Im Rahmen einer Diplomarbeit an der TU Bergakademie Freiberg wurden in 2014 die Grundlagen für die Auswertung von 3D-Punktwolken zur automatisierten Nachtragung des Risswerks gelegt. Um die dafür notwendigen 3D-Punktwolken möglichst wirtschaftlich zu erstellen, laufen seit 2015 Untersuchungen und Testmessungen zur Machbarkeit des untertägigen Einsatzes von mobil messenden Laserscannern. Im Folgenden werden verschiedene technische Ansätze sowie die Ergebnisse der Testmessungen und die weiteren geplanten Schritte vorgestellt. / As part of a thesis at the Technical University of Freiberg, a basis for the analysis of 3D point clouds was set for refining the mine map automatically. Since 2015 studies and test measurements have been running to create the necessary 3D point clouds as economically as possible, by using an underground mobile scanning system. Below the different technical approaches will be presented as well as the results of the test measurements and the next planned steps.

Im Rahmen einer Diplomarbeit an der TU Bergakademie Freiberg wurden in 2014 die Grundlagen für die Auswertung von 3D-Punktwolken zur automatisierten Nachtragung des Risswerks gelegt. Um die dafür notwendigen 3D-Punktwolken möglichst wirtschaftlich zu erstellen, laufen seit 2015 Untersuchungen und Testmessungen zur Machbarkeit des untertägigen Einsatzes von mobil messenden Laserscannern. Im Folgenden werden verschiedene technische Ansätze sowie die Ergebnisse der Testmessungen und die weiteren geplanten Schritte vorgestellt. / As part of a thesis at the Technical University of Freiberg, a basis for the analysis of 3D point clouds was set for refining the mine map automatically. Since 2015 studies and test measurements have been running to create the necessary 3D point clouds as economically as possible, by using an underground mobile scanning system. Below the different technical approaches will be presented as well as the results of the test measurements and the next planned steps.

The ocean ambient noise is one of the important parameters in sonar equation. The ocean ambient noise includes diverse and complex sources like waves, marine life, ships, and etc. Using different ways to analyze are needed to understand the complicated properties of ambient noise. Empirical equation obtained from linear regression of wind speed and ambient noise data is a common method to predict noise level. In this article, the ambient noise data were collected from experiments at northeastern sea of Taiwan in 2007, 2008 and 2009. Applying corresponding wind speed data to observed noise level the time series, coefficient of determination is used to estimate how noise fit with wind speed data of regression. The K-S test and Sea States are used to determine the wind speed threshold. Although it is the same sea area in three years, the ocean ambient noise still has variations due to time and variance of sound sources, so it is important to be investigated. This study compares the statistical properties and distribution in ambient noise level and frequencies with corresponding wind speed in same season.

En esta tesis doctoral se han introducido y analizado de manera exhaustiva una nueva clase de matrices denominada matrices {K,s+1}-potentes. Estas matrices contienen como casos particulares las matrices {s+1}-potentes, periódicas, centrosimétricas, mirrorsimétricas, circulantes, etc. Estos últimos tipos de matrices son de gran utilidad en diferentes áreas tales como transmisión de líneas multiconductor, antenas, ondas, sistemas eléctricos y mecánicos, y teoría de la comunicación, entre otros. En el capítulo 1 se han presentado algunos resultados básicos. En el capítulo 2 se han obtenido diferentes propiedades de las matrices {K,s+1}-potentes relacionadas con la suma, el producto, la inversa, la adjunta, la semejanza y la suma directa. Posteriormente, se han encontrado caracterizaciones de las matrices {K,s+1}-potentes desde distintos puntos de vista: usando teoría espectral, mediante potencias de matrices, a partir de inversas generalizadas, y mediante una representación por bloques de una matriz de índice 1. Luego, en el capítulo 3, se ha relacionado la clase de matrices introducida con diferentes clases de matrices complejas conocidas en la literatura, a saber: matrices {K}-hermíticas, proyectores {s+1}-generalizados, matrices unitarias, matrices normales, centrosimétricas {K}-generalizadas, etc. Con la intención de construir de manera efectiva matrices de esta clase, en el capítulo 4 se han diseñado algoritmos tanto en el caso s mayor o igual a 1 y el caso s=0. Primero se construyen matrices en esta clase a partir de información espectral de la matriz involutiva K. Utilizando este algoritmo se pueden construir más ejemplos. Concretamente, se hallan matrices {K,s+1}-potentes que conmutan con las encontradas anteriormente, y mediante estos dos algoritmos, se puede realizar el análisis de combinaciones lineales de matrices de este tipo. Por otra parte, para los casos s mayor o igual a 1 y s=0 se ha resuelto el problema inverso de calcular las matrices involutivas K que satisfacen la ecuación matricial que se está tratando. También en este caso se han presentado métodos numéricos que lo resuelven. Por último, en este capítulo se incluyen ejemplos numéricos para mostrar las prestaciones de los métodos desarrollados. En el capítulo 5, se extiende el estudio anterior al caso de matrices {K,-(s+1)}-potentes, completando así todos los valores de s enteros posibles. Especial énfasis se ha puesto en el análisis espectral de estas clases de matrices. La tesis finaliza con un anexo en el que se indican las conclusiones finales y las líneas futuras. / Romero Martínez, JO. (2012). Estudio de la clase de matrices {K,s+1}-potentes [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/15974 / Palancia

Book review of the collection titled ´East African literature: Essays on Written and Oral Tradition´ edited by J.K.S. Makokha, Egara Kabaji and Dominica Dipio

無論是在社會科學或是自然科學的研究中, 經常會面對復雜難解的問題, 需要利用電 腦模擬一些自然狀態, 此時亂數就會被應用來增加其可靠性, 減少人為主觀的控制因 素。 1973年Lewis & Payne 提出GFSR方法使用M 序列:a =c a +----c a (mod 2)所有 的c =0或1;c =1且其特徵多項為f(D)=1+C D+-----+C P ,C =1為在GF(2) 中的原始多 項式來產生; 利用上述關系, 首先給定任意非零的初始值, 可以產生一個{a }周期為 2-1 的序列。采用一個固定的delay,使其每個位元行間的關系確定, 即y =0.a a -- ---,t=1,2,----- 。這個方法所產生的擬隨機序列可以得到較線性除模法更長周期的 序列, 且可以改善在除模法中變數個數愈多, 效果愈差的缺點。有定理可以證明它有 m=[p/l] distributed,1=位元數, 的優良性質。 在如何產生一個GFSR序列的演算法中, 除了早期Lewis & Payne(1973) 曾利用FORTRA N 程式發展了一套程式;Collings & Hembree(1986) 也針對他們的演算式加以改進修 正, 利用S (D) 表示D mod f(D)使得{S (D)} 滿足與{a }相同的基本周期關系來做轉 換, 使得演算法更有效率。另外,Fushimi & Tezuka(1983) 年曾提出一個簡便的生成 法。 最后本文將探討有關此產生器的應用, 如在判別分析及在K-S 統計量的修正上。

During the quasar era (redshifts between 1 and 3) Radio Galaxies (RGs) have been claimed to have substantially influenced the growth and evolution of large scale structures in the universe. In this dissertation I test the robustness of these exciting claims. In order to probe the impacts in more detail, good theoretical models for such RG systems are required. With this motivation, I seek to develop an essentially analytical model for the evolution of Fanaroff-Riley Class II radio galaxies both as they age individually and as their numbers vary with cosmological epoch. To do so, I first compare three sophisticated semi-analytical models for the dynamical and radio lobe power evolution of FR II galaxies, those given by Kaiser, Dennett-Thorpe & Alexander (1997, KDA), Blundell, Rawlings, & Willott (1999, BRW) and Manolakou & Kirk (2002, MK). I perform multi-dimensional Monte Carlo simulations leading to virtual radio surveys. The predictions of each model for redshift, radio power (at 151 MHz), linear size and spectral index are then compared with data. The observational samples are the low frequency radio surveys, 3CRR, 6CE and 7CRS, which are flux-limited and redshift complete. I next perform extensive statistical tests to compare the distributions of model radio source parameters and those of the observational samples. The statistics used are the 1-Dimensional and 2-Dimensional Kolmogorov-Smirnov (K-S) tests and the 4-variable Spearman partial rank correlation coefficient. I search for and describe the "best" parameters for each model. I then produced modifications to each of the three original models, and extensively compare the original and the modified model performances in fitting the data. The key result of my dissertation is that using the Radio Luminosity Function of Willott et al. (2001) as the redshift birth function of radio sources, the KDA and MK models perform better than the BRW models in fitting the 3CRR, 6CE and 7CRS survey data when using K-S based statistical tests, and the KDA model provides the best fits to the correlation coefficients. However, no pre-existing or modified model can provide adequate fits for the spectral indices. I also calculate the volume fraction of the relevant universe filled by the generations of radio galaxies over the quasar era. This volume filling factor is not as large as estimated earlier. Nonetheless, the allowed ranges of various model parameters produce a rather wide range of astrophysically interesting relevant volume fraction values. I conclude that the expanding RGs born during the quasar era may still play significant roles in the cosmological history of the universe.

The thesis deals with the evaluation of investments in company shares. It analyzes internal and external surroundings of the selected enterprises and it describes historical development of their ordinary shares. It further deals with the particular comparison of selected investment opportunities in order to find most preferably one. The thesis should enable potential investor to orientate in the investment field

Book review of the collection titled ´East African literature: Essays on Written and Oral Tradition´ edited by J.K.S. Makokha, Egara Kabaji and Dominica Dipio