2,360 research outputs found
A Modular Testbed for Hardware Reconfigurable Radio at the 2.4 GHz ISM Band
No full textA modular testbed for use in developing software defined radio is documented in this paper. The testbed is focused on the 2.4 GHz ISM band but may be used at other frequencies. An RF transceiver with variable transmit/receive frequencies and bandwidths is provided.
It provides the capability to support many modulation schemes and standards such as GSM, UMTS< IEEE 802.11b and parts of the IEEE802.16 standards. It performs the RF functions of the radio, with the other PHY and MAC layer functions such as equalisation and error-coding being performed by a host computer. It communicates with the host computer system through a USB2 interface allowing data rates of up-to 60Mbytes a second. An API is used for communications with the host computer system allowing for modulation/demodulation and coding/decoding in software on the host system and reconfiguration of the radio syste
Interview with Philip Gerard
No full textInterview with Philip Gerard, author and professor of creative writing at UNCW. Here, he discusses his background and education, the founding and structure of UNCW's MFA in Creative Writing program, and the concerns of memoir and creative nonfiction
Farrell, Neil. Interview about cod fishery, cod traps, grades of fish, fish plants, decline in the fishery.
No full textInterview with Neil Farrell about the cod fishery, cod traps, grades of fish, fish plants, and the decline in the fishery over time.00:00-00:20 Neil Farrell, Marystown, born 1958, collector-Susanna Glavine, November 18, 2019; 00:32-last inshore fisherman, 35 years fishing; 00:41father involved in fishery, took over from him, new technology;1:03-all fishing involved cod, cod raps, cod jiggers in fall; 01:39- all fish sold to local merchant’s, Reddy, Murley, Wiscombe; 01:50- price low, fish grades, Jamaica; 02:23- quintal; 02:46-typical day, daylight, traps, splitting, salting, second trip to trap; 03:38- family, paid in September; 04:17- trap skiffs, local people, Gerard Kelly, Beau Bois, last skiff built, Dick Kelly, Edward Farrell’ 04:50- barter system; 05:20- opening of fish plant; 06:10-decline after shipyard opened, better wages; 06:41-memories, smoking on wharf, fire in shed, father, brothers, uncles; 07:30-community loss, decline of inshore fishery, no charge, no young men; 08:13- anecdotes, talk to brother John; 08:34-end of fishery, selling out licence, no one to take over, emotional at end of fishing caree
Supplemental Material2 - Supplemental material for Current evidence for nonpharmacological interventions and criteria for surgical management of persistent acromioclavicular joint osteoarthritis: A systematic review
No full textSupplemental material, Supplemental Material2 for Current evidence for nonpharmacological interventions and criteria for surgical management of persistent acromioclavicular joint osteoarthritis: A systematic review by Gerard Farrell, Lyn Watson and Hemakumar Devan in Shoulder & Elbow</p
Performance requirements for analog-to-digital converters in wideband reconfigurable radios
No full textWith the current trend towards software defined radio, several dandidate architectures for the analog receiver front-end have been presented. A common proposal for software defined reconfigurable radio is to develop a wideband ADC and utilise this for capturing a large segment of the spectrum. This would enable the subsequent signal processing operations of channel selection and data extraction to be carried out by a digital processor. This would allow the radio to be reconfigured by simply changing the software.
In analysis of these systems, powerful neighbouring signals, or blockers, are considered but it has been conveniently assumed that suitable dynamic range will be available at the ADC. THis is an acceptable assumption in narrowband systems where automatic gain control and analogue channel select filters can be used, but is not appropriate for a wideband system. In this paper we present an analysis based on bit-error-rates (BER) which shows the effect of blockers in a wideband architecture on the performance of the communication link and on the dynamic range requirements of the ADC.
We consider, as a representative example of a real world situation, the use of a wideband receiver on a Rayleigh fading channel. In any analysis of wideband receivers, the behaviour of the channel must also be included as the performance of the communication link is a combination of noise sources from both the channel and the electronics. The effect of high power interferers and blockers on the quantisation noise from the ADC will be mathematically modelled and the BER rates for the communication system will be presented. Given these results, it is possible to determine the minimum required resolution and dynamic range for an ADC in a wideband system given the spectral environment at the frequencies of interest
Supplemental Material1 - Supplemental material for Current evidence for nonpharmacological interventions and criteria for surgical management of persistent acromioclavicular joint osteoarthritis: A systematic review
No full textSupplemental material, Supplemental Material1 for Current evidence for nonpharmacological interventions and criteria for surgical management of persistent acromioclavicular joint osteoarthritis: A systematic review by Gerard Farrell, Lyn Watson and Hemakumar Devan in Shoulder & Elbow</p
Philip Gerard, 25th Annual ODU Literary Festival
No full textPhilip Gerard has published fiction and nonfiction in numerous magazines, including New England Review, Bread Loaf Quarterly, Creative Nonfiction, Hawaii Review, Hayden\u27s Ferry Review, and The World & I. He is the author of three novels: Hatteras Light, Cape Fear Rising, Desert Kill; two books of nonfiction, Brilliant Passage...a schooning memoir and Creative Nonfiction - Researching and Crafting Stories of Real Life, and Writing a Book that Makes a Difference. His most recent book is Secret Soldiers, about the first and last battlefield deception outfit ever authorized by the U.S. Army. Gerard has written shows for public television and radio. He teaches creative writing at the University of North Carolina at Wilmington
Modelling and Design of High-Order Phase Locked Loops
No full textIn this paper a new stable high order Digital Phase Lock Loop (DPLL) design technique is proposed. This technique uses linear theory to design the DPLL. The stability of the DPLL is guaranteed by placing a restriction on the system gain. This stability boundary is found by transforming the system transfer function to the Z-domain and plotting the root locus of the LPLL for values of gain where all the system poles lie inside the unit circle. The max value of gain where all the poles lie inside the unit circle is the stability boundary. It is shown that the stability boundary of the LPLL is comparable to the stability boundary of the
DPLL. Finally where the above Bessel filter system produces slow lock, gear shifting of the DPLL components is considered. This allows the DPLL to start off with a wide loop bandwidth and switch to the narrow bandwidth once the system has locked
Immune priming: the secret weapon of the insect world Gerard Sheehan, Gemma Farrell & Kevin Kavanagh
No full textInsects are a highly successful group of animals that inhabit almost every habitat and environment on Earth. Part of their success is due to a rapid and highly effective immune response that
identifies, inactivates, and eliminates pathogens. Insects possess an immune system that shows
many similarities to the innate immune system of vertebrates, but they do not possess an
equivalent system to the antibody-mediated adaptive immune response of vertebrates.
However, some insect do display a process known as immune priming in which prior exposure
to a sublethal dose of a pathogen, or pathogen-derived material, leads to an elevation in the
immune response rendering the insect resistant to a subsequent lethal infection a short time later.
This process is mediated by an increase in the density of circulating hemocytes and increased
production of antimicrobial peptides. Immune priming is an important survival strategy for certain
insects while other insects that do not show this response may have colony-level behaviors that
may serve to limit the success of pathogens. Insects are now widely used as in vivo models for
studying microbial pathogens of humans and for assessing the in vivo efficacy of antimicrobial
agents. Knowledge of the process of immune priming in insects is essential in these applications
as it may operate and augment the perceived in vivo antimicrobial activity of novel compounds
Kant and Gerard on imagination
No full textAlexander Gerard, a schottish philosopher, is nowadays almost
forgotten, but at the time of Kant’s philosophical development he was a very
popular author and his works were translated to german. Kant mentioned Gerard
sometimes in his lectures on anthropology, particularly about genius and
imagination. A near analysis and comparing of their conception of genius and
imagination shows a significant influence of Gerard on Kant. Purpose of this
paper is to analyse this influence in the particular case of imagination and active
imagination.O filósofo escocês Alexander Gerard foi quase que inteiramente
esquecido pela história da filosofia. Mas na época em que Kant estava
desenvolvendo sua filosofia crítica, particularmente nos anos 1770, Gerard era
um autor bastante popular, tendo seus principais escritos traduzidos inclusive
para o alemão. Kant o menciona algumas vezes nas lições sobre antropologia,
permitindo assim documentar sua leitura. Este artigo procura mostrar a
influência de Gerard sobre Kant na concepção de uma imaginação ativa, peça
central da filosofia transcendental kantiana
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