Application of fractional delay filters to tune the centre frequency location of single-band sigma-delta modulators

This paper presents a novel technique for the design of narrow-band sigma-delta modulators with an embedded tunable centre frequency mechanism. This method demonstrates that the use of sum filters combined with a fractional delayer provide the flexibility of tuning the noise shaping band for any desired variable centre frequency input signal.

A comparative study of complex multiple-band noise-shaping sigma-delta modulators for multi-tone input signals

This paper presents a comparative study of complex single-bit and multi-bit sigma-delta modulators that are capable of providing concurrent multiple-band noise-shaping for multi-tone narrow-band input signals. The concepts applied for the three design methodologies are based on the noise transfer functions of complex comb, complex slink and complex multi-notch filters.

Increasing the variability of centre frequency locations in multiple-band sigma-delta modulators via the use of fractional delay filters

This paper presents the design analysis of novel tunable narrow-band bandpass sigma-delta modulators, that can achieve concurrent multiple noise-shaping for multi-tone input signals. This approach utilises conventional comb filters in conjunction with FIR, or allpass IIR fractional delay filters, to deliver the desired nulls for the quantisation noise transfer function. Detailed simulation results show that FIR fractional delay comb filter based sigma-delta modulators tune accurately to most centre frequencies, but suffer from degraded resolution at frequencies close to Nyquist. However, superior accuracies are obtained from their allpass IIR fractional delay counterpart at the expense of a slight shift in noise-shaping bands at very high frequencies.

The University Band March 6, 1966

Concert program for The University Band March 6, 1966

Low Profile Multi-Band Antenna for Mobile Communications

In this paper, the design of low profile antennas by using Electromagnetic Band Gap (EBG) structures is introduced. Taking advantage of the fact that they can behave as Perfect Magnetic Conductor (PMC), it is shown that these structures exhibit dual band in-phase reflection at WLAN (Wireless Local Area Network) bands, the 2.4 GHz and 5.2 GHz bands. These structures are applied to PIFA (Planar Inverted-F Antenna) and the results show that it is possible to obtain low profile PIFA's.

Design and evaluation of multi-band RF energy harvesting circuits and antennas for WSNs

Radio frequency (RF) energy harvesting is an emerging technology that will enable to drive the next generation of wireless sensor networks (WSNs) without the need of using batteries. In this paper, we present RF energy harvesting circuits specifically developed for GSM bands (900/1800) and a wearable dual-band antenna suitable for possible implementation within clothes for body worn applications. Besides, we address the development and experimental characterization of three different prototypes of a five-stage Dickson voltage multiplier (with match impedance circuit) responsible for harvesting the RF energy. Different printed circuit board (PCB) fabrication techniques to produce the prototypes result in different values of conversion efficiency. Therefore, we conclude that if the PCB fabrication is achieved by means of a rigorous control in the photo-positive method and chemical bath procedure applied to the PCB it allows for attaining better values for the conversion efficiency. All three prototypes (1, 2 and 3) can power supply the IRIS sensor node for RF received powers of -4 dBm, -6 dBm and -5 dBm, and conversion efficiencies of 20, 32 and 26%, respectively. © 2014 IEEE.

Fly by data link: feasibility of a relative navigation solution for aviation relying on a future L-band data link

Trabalho final de Mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e Telecomunicações

Betydelsen av livsloppsperspektivet och den sociala utbytesteorin för förståelsen av närståendevård som en möjliggörare för ett gott åldrande : en kvalitativ studie

Bakgrunden till avhandlingen är att andelen äldre ökar i Finland, vilket medför ett behov av nya ekonomiska lösningar samtidigt som vårdkvaliteten tryggas. Närståendevård är en för samhället förmånlig vårdform som möjliggör att äldre får bo hemma längre samtidigt som institutionsvården minskar. Det är i enlighet med den finländska regeringens målsättningar och närståendevården ska därför utökas. I forskning om närståendevård har man främst fokuserat på vårdarens upplevelser och det finns ett behov av att öka kunskapen om vårdtagarnas upplevelser. Avhandlingens syfte är således att undersöka äldre vårdtagares upplevelser av närståendevård och åldrande genom att tillämpa livsloppsperspektivet och den sociala utbytesteorin. Avhandlingens fyra frågeställningar är ifall närståendevård upplevs som en god vårdform sett ur vårdtagarens synvinkel, vad som upplevs som positivt och negativt med vårdformen, vilken betydelse reciprocitet har för vårdtagaren och vilka möjligheter hon eller han har till reciprocitet i relationen till närståendevårdaren samt vilken betydelse vårdtagarens tidigare livsskeden har för hans eller hennes upplevelser av närståendevård. I avhandlingen behandlas även utvecklingen inom socialgerontologiska teorier. Två av de mest använda socialgerontologiska teorierna på 2000-talet är livsloppsperspektivet och den sociala utbytesteorin. Livsloppsperspektivet innebär att man tar i beaktande många olika faktorer såsom t.ex. samhälleliga förändringar och en individs tidigare livsskeden när man studerar åldrande. Den sociala utbytesteorin utgår från att det en människa ger åt en annan, förväntar hon sig tillbaka. I en obalanserad utbytesrelation uppstår missnöje och en känsla av maktlöshet hos den som enbart är mottagare. Det är en situation som äldre riskerar att hamna i, då deras resurser inte alltid värdesätts av den yngre, arbetsföra generationen. I denna kvalitativa studie har semistrukturerade temaintervjuer genomförts. Sju svenskspråkiga närståendevårdtagare i åldern 71-80 har intervjuats i Österbotten. Materialet har analyserats med hjälp av kvalitativ innehållsanalys. Resultaten visar att vårdtagarna överlag upplever närståendevård som en god vårdform med många fördelar. Vårdtagarna uppskattar framför allt att få bo hemma och tryggheten i att vårdas av någon anhörig som känner dem väl och hela tiden är tillgänglig. Flera vårdtagare upplever oro inför framtiden, eftersom de inte vet vad som händer om eller när närståendevårdarens hälsa försämras. Flera vårdtagare upplever frustration över sitt hälsotillstånd och hade inte förväntat sig att åldrandet skulle se ut på det sätt som det gör. Missnöjet tycks inte vara en följd av avsaknad av reciprocitet i relationen till närståendevårdaren, utan de negativa känslorna handlar om att acceptera det försämrade hälsotillståndet efter att tidigare ha levt ett aktivare liv.

The band structure of Cd0

The Augmented Pl ane Wave Method has been used to calculate the one-electron energy band structure of CdO. Energy eigenva l ues were calculated along three symmetry lines and for some other general wave-vectors of interest.

The satellite band patterns in the near ultraviolet absorption spectra of isotopic compounds of acetaldehyde

The 3700 A - 3000 A absorption spectra of CH3CHO and its isotopic compounds such as CH3CDO, CD3CHO and CD3CDO were studied in the gas phase at room temperature and low temperatures. The low resolution spectra of the compounds were recorded by a 1.5 m Baush and Lomb grating spectrograph. The high resolution spectra were recorded by a Ebert spectrograph with the Echelle grating and the holographic grating separately. The multiple reflection cells were used to achieve the long path length. The pressure-path length used for the absorption spectrum of CH 3CHO was up to 100 mm Hg )( 91 . 43mo The emission spectrum and the excitation spectrum of CH3CHO were also recorded in this research. The calculated satellite band patterns \vhich were ob-tailied by the method of Lewis were used to compare with the observed near UV absorption spectrum of acetaldehyde. These calculated satellite band patterns belonged to two cases: namely, the barriers-in-phase case and the barriers- out-of-phase case. Each of the calculated patterns corresponded to a stable conformation of acetaldehyde in the excited state . The comparisons showed that the patterns in the observed absorption spectra corresponded to the H-H eclipsed conformations of acetaldehyde in the excited state . The least squares fitting analysis showed that the barrier heights in the excited state were higher than in the ground state. Finally, the isotopic shifts for the isotopic compounds of acetaldehyde were compared to the compounds with the similar deuterium substitution.

Average White Band poster, ca. 2000

The Average White Band's debut album, Show your hand, was released in 1973. The "classic funk and R & B" band included members Alan Gorrie, Owen "Onnie" McIntyre, Malcolm "Mollie" Duncan, Roger Ball, Robbie McIntosh, and Mike Rosen. Rosen was quickly replaced by Hamish Stuart. The band, comprised of Scotsmen, released a second album in 1974 that featured the US number 1/UK Top 10 single "Pick up the Pieces". That same year, Robbie McIntosh died of a heroin overdose and was replaced by Steve Ferrone. The song "Cut the Cake" from their third album made the US top 10, and subsequent releases in the late 1970s and early 1980s proved successful. The members largely pursued individual projects in the years that followed, but re-formed in 1989 (with original members Gorrie, Ball and McIntyre, and new members Alex Ligertwood and Eliot Lewis) and released the album Aftershock. Over the years, the band's members have changed, and the band is currently comprised of Onnie McIntyre, Rocky Bryant, Alan Gorrie, Fred "Freddy V" Vigdor and Klyde Jones. Their most recent album, Times Squared, was released in 2009.

Rotational analysis of the 5 1 0 6 1 0 band of formyl chloride

Please consult the paper edition of this thesis to read. It is available on the 5th Floor of the Library at Call Number: Z 9999 C54 L434 1989