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We address a number of geometric issues in spatial indexes. One area of interest is spherical data. Two main examples are the locations of stars in the sky and geodesic data. The first part of this dissertation addresses some of the challenges in handling spherical data with a spatial database.
In modern motor manufacturing, it is often a necessary exercise to seek ways to reduce the production cost to stay being competitive. Ball bearings are one of the main components that are used in most high performance motors. The typical cost for a set of ball bearing, that used in vacuum cleaner motor is around US$0.40 each
Steganography, meaning hidden writing, is the technique of concealing secret information into another cover-media, such as audio, video, image and text, in such a manner that the very existence of the information is camouflaged. Unlike the goal of cryptography, which prevents the data from illicit access and modification by transforming the secret data into messy and meaningless bit-streams, the aim of steganography is to conceal their very existence such that the embedded data is inaudible or invisible to the grabbers.
Since the 1970s and 1980 important links in the European rail network have slowly been enhanced or made suitable for high speed trains. The main reasons why these links were enhanced are to increase the link capacity, to raise speed in slow areas and to improve long distance accessibility. Some 40 years later the European rail network provides fast medium distance passenger transport within distinct nations, but also on international links.
In this document the final outcomes of the analysis on rework events in construction projects of Grupo Williams (GW) are shown. The intention of the study has been formulated as: To assess rework costs in construction projects of Grupo Williams and recommend improvements to cut back these rework costs. The assessment was done through analysis of realized projects.
Silica-based membranes are regarded as promising way of hydrogen separation at elevated temperatures because of their high H2 permeance, excellent selectivity and relative ease to scale up. This really is particularly relevant because of their applications in coal gasification and steam reforming
A long-period grating formed in a single-mode optical fiber or waveguide can cause light coupling between the guided mode and the co-propagating cladding modes at specific resonance wavelengths and, therefore, produce a transmission spectrum that consists of a series of rejection-bands centered at those wavelengths.
A Barker sequence is a finite length binary sequence using the minimal possible aperiodic autocorrelation. Presently, only 8 known Barker sequences exist and it has been conjectured that these are the only Barker sequences which exist. This dissertation shows that long sequences
Currently, code-division multiple access (CDMA) technique continues to be a dominant air-interface technology for personal wireless communication systems. Mobile communication systems based on CDMA is always subject to multiple access interference (MAI) problem due to the difficulty in maintaining orthogonality of CDMA signals in a mobile environment.
Integrated optics, by which optical devices are fabricated on a chip, is really a speedily growing field. Integrated optics is different from free-space optics in the manner which performs that will usually need bulky equipment in free-space optics, are put together on