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Sökning: LAR1:cth > Övrigt vetenskapligt/konstnärligt

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31.
  • Abarkan, Abdellah, 1960 (författare)
  • Bebyggelsemönster i medelhavsområdet: en studie av medinan i Fes ställd i relief mot Siena|
  • 1995
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • This thesis is an analysis and comparative study of medieval Mediterranean urban patterns. With urban patterns is meant the arrangement of houses and public spaces with special regard to the relations between them. The thesis contains four parts. Previous research on Muslim cities is described and commented in the first part. A difference between research before and after 1960 is noted. The Medina of Fes is discussed in the second part. In an historical background sketch the foundation of the Medina and its development are presented. The spatial analysis shows that the physical structure of the Medina is based on a primary pattern unit of a square courtyard house with a closed, inward-turned physical structure. A number of these primary units are grouped around a cul de sac to form a second-level community unit; a number of these latter form a quarter. The quarters are adjacent and close to each other which means that the Medina as a whole can be regarded as a complex physical and social unit surrounded with the city walls. In a comparable approach the physical and social structure of Siena is studied. The primary units here are the casa corte, which is similar to the courtyard of the Medina, and the casa a schiera which is a filehouse without any comparative physical form in the medina. These two different primary units engendered two types of building patterns, one in the city centre where courtyard units are grouped around a central square, and the other one in the periphery of the city formed by the alignment of the filehouses along the street. An attempt to compare the physical and social units in the Medina and Siena is made in the fourth part of this thesis. The primary units, the community units, the quarters and the cities are compared. This comparative study shows that the similarities between the Medina and Siena are much more apparent on the social level and on the level of the smaller physical units, i.e. the habitat, than between the larger social and physical composition of the quarters.
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35.
  • Abbasi, Morteza, 1982, et al. (författare)
  • An E-Band(71-76, 81-86 GHz) Balanced Frequency Tripler for High-Speed Communications
  • 2009
  • Ingår i: APMC: 2009 ASIA PACIFIC MICROWAVE CONFERENCE. - 9781424428014 ; 1-5, s. 1184-1187
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • An E-Band transistor-based balanced frequency tripler is implemented using a 0.15 mu m GaAs mHEMT process which can be integrated into a single-chip RF front-end. The balanced configuration with 90 degrees hybrids at the input and output improves the port impedance matching which is measured to be better than 15 dB at the input and 10 dB at the output over the frequencies of interest. The tripler has a conversion loss of 11.5 dB from 71 GHz to 76 GHz and 14 dB from 81 GHz to 86 GHz. The second and forth harmonics are suppressed by more than 30 dB and the fundamental frequency by 20 dB. The tripler can deliver -2 dBm output power.
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36.
  • Abbasi, Morteza, 1982, et al. (författare)
  • Direct carrier quadrature modulator and Demodulator MMICs for 60 GHz gigabit wireless communications
  • 2011
  • Ingår i: Asia-Pacific Microwave Conference Proceedings (APMC 2011; Melbourne, VIC; 5 - 8 December 2011). - 9780858259744 ; , s. 1134-1137
  • Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
    • A 60 GHz direct carrier quadrature modulator is designed and fabricated in 0.15 μm mHEMT technology. The design is based on passive mixers and therefore reciprocal which makes it possible to be used both as modulator and demodulator. The modulator has an input bandwidth of 0-5 GHz on each of the I and Q ports and an RF bandwidth of 53-68 GHz. Carrier leakage to the output port is eliminated by addition of an inductive path from the LO port to the RF port. The modulator requires 5 dBm LO power and can output up to -6 dBm RF power in linear region and up to -4 dBm when driven into saturation. When operated as an SSB mixer, the conversion loss is measured to be 11 dB and image and LO signals are suppressed by as much as 30 dB compared to the desired signal. For demonstration, a pair of the presented modulator/demodulator is used to transmit 7Gbps BPSK signal over 1m and 10Gbps QPSK signal over 0.5m wireless link.
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40.
  • Abdulahovic, Tarik, 1976 (författare)
  • Analysis of High-Frequency Electrical Transients in Offshore Wind Parks
  • 2011
  • Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
    • In this thesis, a study of high frequency electromagnetic transient phenomena is performed. Models of various components needed for simulations of high frequency transients, such as for transformers, cables and breakers are developed. Measurements were performed in Chalmers research laboratory as well as at ABB Corporate Research in Västerås, Sweden for the purpose of parameter estimation of models and for verification of simulations. Critical cases where the voltage surges of the magnitude and/or rise time above basic lightning impulse voltage level appear, are identified. Also, some transient protection schemes are analyzed and the performance of different transient mitigation devices is studied. Furthermore, the voltage distribution along the winding during very fast transients is studied in order to estimate turn-to-turn voltages and the critical voltage envelope. In the work it was found that simulations of the high frequency transients are in a very good agreement with the measurements obtained in the laboratory. Simulations predicted accurately critical surges with the highest magnitude and matched with good accuracy surge waveforms recorded during the measurements. The accuracy of the rise times is within 10%, while the magnitudes during the critical cases are within a 5% margin. During the testing and simulations, surges which exceed the basic lightning impulse voltage level of dry-type transformers specified by IEEE standards, both in magnitude and rise time are observed at the transformers even when surge arresters are used to protect the transformers. Furthermore, obtained voltage surges exceeded the proposed critical voltage envelope. It is shown that the most critical voltage strikes are obtained with dry-type transformers, where the rise time is five to ten times shorter compared to oil-insulated transformer with the same rating. It was confirmed both in simulations and measurements that the use of additional transient protections devices such as surge capacitors and RC protections, decreased the magnitude of surges to be below the critical level. The analysis of the voltage during very fast transients showed that the rise time of the transients directly influences the magnitude of the turn-to-turn voltages. Furthermore, during the breaker closing transient, turn-to-turn voltages, measured in delta connected dry-type transformers, were 2.5 times higher than the voltages obtained during the same transient with a wye connected dry-type transformer, or during the stress with a 4.4 p.u. lightning impulse voltage.
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