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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
provided by the
Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 31 to 37 of 37 (0.024 seconds)| 31 |
Useful criteria relating to the acceptance of weak prophetic reports corroborated by other narrative chains / Timār al-yāniʻat fī aḥkām al-shāhid wa-al-matābat / Useful criteria relating to the acceptance of weak prophetic reports corroborated by other narrative chainsMohamud, M. M. 30 November 2005 (has links)
Prophetic reports, constituting the second foundational source of the Islamic
Weltanschauung, have been categorised in terms of their authenticity. The current work
explores reports occurring in single transmission chains that are corroborated in word or
meaning by other similarly narrated reports whose source at the level of Prophet
Muhammad's companions could either be the same or different.
Rules pertaining to this field have been amalgamated for the first time to simplify their
application. Appropriated practical examples have been given to illustrate harmony between
theory and praxis.
Concentration has been restricted to a corroboration of reports by other transmission chains.
An examination of the latter falls outside the scope of this investigation. / Religious Studies and Arabic / M.A. (Islamic Studies)
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Useful criteria relating to the acceptance of weak prophetic reports corroborated by other narrative chains / Timār al-yāniʻat fī aḥkām al-shāhid wa-al-matābat / Useful criteria relating to the acceptance of weak prophetic reports corroborated by other narrative chainsMohamud, M. M. 30 November 2005 (has links)
Prophetic reports, constituting the second foundational source of the Islamic
Weltanschauung, have been categorised in terms of their authenticity. The current work
explores reports occurring in single transmission chains that are corroborated in word or
meaning by other similarly narrated reports whose source at the level of Prophet
Muhammad's companions could either be the same or different.
Rules pertaining to this field have been amalgamated for the first time to simplify their
application. Appropriated practical examples have been given to illustrate harmony between
theory and praxis.
Concentration has been restricted to a corroboration of reports by other transmission chains.
An examination of the latter falls outside the scope of this investigation. / Religious Studies and Arabic / M.A. (Islamic Studies)
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Měření přenosových a imitančních charakteristik aktivních obvodových prvků / Measurement of Transfer and Immittance Characteristics of Active Circuit ElementsMarek, Pavel January 2009 (has links)
This diploma work deals with active circuit elements and proposals of methods for measuring of some parameters of these elements. In the opening part the work deals with general classification of elements used in electronic circuits, ideal and real current sources and power supplies. Further there are stated basic parameters and characteristics presented by producers in a catalogue sheet for active elements MAX435, OPA660, AD844 and MAA741 element which already belongs to the history of IC. Main attention is paid to active circuit elements with current sources driven by CCCS (Current Controlled Current Source) and AD844 (high speed monolithic operational amplifier). In the work there is described a method for determining of selected parameters of active elements with CCCS. Examined parameters were frequency characteristics of current transfer, input impedance and output impedance. The proposed method was verified by a computer simulation on above mentioned active elements by means of PSpice software. Findings along with the description are summarized at the end of the work. In the closing part of the work there is undertaken a real measure of AD844 element based on the proposed method and the findings are compared with particular simulations. However, at first a flat connection board was made by means of EAGLE software and then the measure was performed on it.
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Systemanalyse und Entwicklung Six-Port basierter Funkempfängerarchitekturen unter Berücksichtigung analoger StöreffekteMailand, Marko 09 January 2008 (has links) (PDF)
Due to the increasing demand of broadband capability and reconfigurability for mobile applications, there is an enormous interest to develop appropriate analog receiver front-ends. In this respect, one promising candidate group is the Six-Port-based direct conversion receiver. The presented work focuses on the investigation of Six-Port-based mobile receiver front-ends with their specific systematical signal processing. Thereby, issues of spurious interfering signals which are generated within the down conversion process of such receivers are of special interest. Based on a comprehensive description of the analog signal processing within additive frequency conversion, a reason could be identified why existing Six-Port receivers have not found any practical application in mobile communication yet – the dynamic DC-offset. With this insight compensation techniques were developed to overcome the negative influences of the dynamic DC-offset. Furthermore, this work presents novel Six-Port-based receiver architectures which, on the one hand, keep the advantages of additive mixing systems like: low power consumption, broadband capability and simplicity of implementation especially for mm-wave transmissions. On the other hand, these novel architectures comprise compensation techniques such that systematically generated spurious signals are inherently compensated in the analog part of the receiver. Moreover, the influence of impairments of phase and amplitude within the IQ-branches of a receiver was investigated. The resulting, unwanted IQ-imbalance was shown to be a mixing method (multiplicative or additive) independent spurious effect. It is suggested to compensate for IQ-imbalance in the digital part of the receiver system. This can be realized with the use of adaptive algorithms. The comparison with conventional analog receiver architectures (especially homodyne receivers) with respect to the reception of today’s and future digitally modulated transmission signals indicate the proposed Six-Port-based receiver architectures to be suitable candidates to fulfill the difficult tasks of modern mobile communication.
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Systemanalyse und Entwicklung Six-Port basierter Funkempfängerarchitekturen unter Berücksichtigung analoger StöreffekteMailand, Marko 22 October 2007 (has links)
Due to the increasing demand of broadband capability and reconfigurability for mobile applications, there is an enormous interest to develop appropriate analog receiver front-ends. In this respect, one promising candidate group is the Six-Port-based direct conversion receiver. The presented work focuses on the investigation of Six-Port-based mobile receiver front-ends with their specific systematical signal processing. Thereby, issues of spurious interfering signals which are generated within the down conversion process of such receivers are of special interest. Based on a comprehensive description of the analog signal processing within additive frequency conversion, a reason could be identified why existing Six-Port receivers have not found any practical application in mobile communication yet – the dynamic DC-offset. With this insight compensation techniques were developed to overcome the negative influences of the dynamic DC-offset. Furthermore, this work presents novel Six-Port-based receiver architectures which, on the one hand, keep the advantages of additive mixing systems like: low power consumption, broadband capability and simplicity of implementation especially for mm-wave transmissions. On the other hand, these novel architectures comprise compensation techniques such that systematically generated spurious signals are inherently compensated in the analog part of the receiver. Moreover, the influence of impairments of phase and amplitude within the IQ-branches of a receiver was investigated. The resulting, unwanted IQ-imbalance was shown to be a mixing method (multiplicative or additive) independent spurious effect. It is suggested to compensate for IQ-imbalance in the digital part of the receiver system. This can be realized with the use of adaptive algorithms. The comparison with conventional analog receiver architectures (especially homodyne receivers) with respect to the reception of today’s and future digitally modulated transmission signals indicate the proposed Six-Port-based receiver architectures to be suitable candidates to fulfill the difficult tasks of modern mobile communication.
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Koexistence mobilních komunikačních systémů GSM-EDGE a UMTS / GSM-EDGE and UMTS Systems CoexistenceGleissner, Filip January 2009 (has links)
The dissertation thesis deals with the investigation of the coexistence of GSM–EDGE and UMTS systems with focus on the physical layer of the systems. The aim is to provide a set of recommendations for practical cooperation while the systems operate in both the separated and the common radio bands. A detailed description of signal processing of both the systems on the physical layer is presented. On the basis of this description, models of both systems were created and implemented in the MATLAB environment. The simulations are focused on the physical layer quality parameters, especially the bit error ratio evaluation for various ratios of useful signal power to noise power during the transmission over the radio channel. Simulation is also used to examine the quality of received useful signal while it is interfered by signals from the same and adjacent channels. The purpose is to determine the isolation between these adjacent channels, when the bit error ratio of the useful signal does not exceed a certain reference value. The simulation results are subsequently subjected to comparison with the results of the experimental measurements in laboratory conditions. Before the measurements are carried out, a study of possible interference types is performed. Consequently, the crucial parameters of the measuring equipment used are verified. From the results of simulations and measurements, the proposal of a minimum and recommended carrier separation between both the systems is presented in order to efficiently utilize the assigned frequency spectrum. Furthermore, for the cooperation in both the separated and the common radio bands, the necessary precautions are given for reaching the required isolation and thereby inter-system interference minimization.
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FauxtopiaKampf, Raymond William 01 January 2004 (has links)
To all who come to this fictitious place:Welcome.Fauxtopia is your land. Here, age relives distorted memories of the past, and here, youth may savor the challenge of trying to understand the present. Fauxtopia is made up of the ideals, the dreams and the fuzzy facts which have re-created reality... with the hope that it will be a source of edutainment for all the world.Ray KampfFauxtopia DedicationApril 1st, 2004
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