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  • About
  • 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.
631

Flight Test Results from C-Band Missile Telemetry Project

Kujiraoka, Scott, Felder, Russ, Johnson, Ben 10 1900 (has links)
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA / Over the past few years, papers have been presented relating to the design and development of a telemetry section used to compare the performance between S-Band and C-Band telemetry links. In addition, the flight test plans to make this comparison have been discussed. Captive Carry Test Flights (on a F-18 fighter jet) over the NAVAIR Sea and Land Ranges at Point Mugu and China Lake were conducted during the April-July 2014 timeframe. In addition a Live Fire Test Flight over the Land Range of the specially outfitted missile was performed in July 2014 as well. This paper will discuss these series of flights tests and provide a performance assessment of the data quality between the C-Band and S-Band telemetry data links. In addition, lessons learned from the various test flights will be included as well. Due to publication deadlines, the results will be summarized at the actual conference.
632

C Band Telemetry at Airbus Flight Test Centre

Fréaud, Gilles 10 1900 (has links)
ITC/USA 2014 Conference Proceedings / The Fiftieth Annual International Telemetering Conference and Technical Exhibition / October 20-23, 2014 / Town and Country Resort & Convention Center, San Diego, CA / Airbus is authorized to use S-band for Telemetry transmission until 2015. In October 2011, the decision was taken to move to C-band in 2013, to cope with Airbus development aircraft planning. The objective was a real challenge for 2 main reasons: C-band channel was not characterized in Airbus transmission environment and it was necessary to validate the propagation performance for Flight Tests uses. The selected solution is based on Coded Orthogonal Frequency Division Multiplexing (COFDM) modulation. There was no existing solution so it has led the Airbus Test Centre to drive the development of its own C Band solution. C-band telemetry at Airbus has been tested and evaluated in flight from April 2012. The first goal was to check the coverage and the impact of the bad weather condition. Besides, it was necessary to characterize the channel to choose the optimised parameters for the waveform in the Toulouse Blagnac environment. This selection of parameters allows the high quality and increased data rate required for Airbus Telemetry to be reached. The test results consolidated the choice of a COFDM modulation, when given the high sensitivity to multipath of usual Frequency Modulation in the airport environment full of buildings and aircrafts. Moreover, it has been possible to reach a similar quality to the S-band telemetry systems, thanks to a fine tuning of the waveform parameters, and tracking system. Deployment of the system by modifying 8 reception antennas and 12 development aircrafts was done over a span of 4 weeks in January 2014. No impact on Airbus A350 certification campaign occurred due to close collaboration with Flight Test Operations. The new Telemetry system enables an increase of telemetry capabilities in the future, especially the data throughput, simplified remote control and monitoring. This experience is an opportunity to set up a new standard.
633

C-Band Missile Telemetry Test Project

Kujiraoka, Scott, Fielder, Russell 10 1900 (has links)
ITC/USA 2013 Conference Proceedings / The Forty-Ninth Annual International Telemetering Conference and Technical Exhibition / October 21-24, 2013 / Bally's Hotel & Convention Center, Las Vegas, NV / The physics associated with transmitting and receiving a telemetry signal at a frequency greater than an octave above the current operating band is such that an end-to-end evaluation of the complete data link system (both the transmit and receive side) is required. In 2012, Airborne Instrumentation Systems Division (AISD), Naval Air Warfare Center Weapons Division (NAWCWD) was sponsored by the Office of the Secretary of Defense (OSD) to develop a couple of short-range air-to-air missile platforms that use a specially-designed warhead-replaceable telemetry section incorporating three data links: (1) an S-band link to transmit Time- Space-Position Information (TSPI), (2) an C-band link, and (3) an additional S-band link where the latter two are transmitting the same pseudo-random bit sequence at the same effective radiated power level. Flight testing will consist of a series of captive tests conducted over land and water. The tests will be performed under a variety of conditions to induce potential issues caused by multipath, atmospheric ducting, fast-slewing of the tracking antenna, and large propagation losses. Flight testing will culminate with the live-fire of a missile over a military land range. This paper describes the continuing efforts of this test program from these series of flight tests, thus quantifying the performance of C-band telemetry data transmission as compared to the S-band.
634

Tropical narratives : Studies in a fifteenth-century poetic of desire and writing

Glover, B. W. January 1986 (has links)
This thesis seeks to re-evaluate the role of trope in English late-medieval poetic narratives. The main texts included in this study are The Floure and the Leafe, The Assembly of Ladies, Chaucer's Troilus and Criseyde, Lydgate's Temple of Glas, The Kingis Quair, Skelton's Bowge of Court and Garlande or Chapelet of Laurell, and The Isle of Ladies. Material drawn from other latemedieval texts is used for comparative and illustrative purposes. Study of these texts suggests that trope should be approached as a constitutive element of narrative structure, and so, while a particular use of familiar trope emerges in this study, the thesis also offers a methodology of reading which may be useful for understanding late-medieval narrative poems in general. One of the major issues discussed in the thesis is the relation of the individual text to a poetic discourse which is seen as pre-given and in determining relation to narrative structures. The thesis traces the emergence of a range of metaphors for the discussion of poetic and linguistic issues in narrative poems themselves. In particular, images of navigation are isolated as a major metaphorics of writing seen as an activity which engages with a problematics of the control of a pre-given discourse. Thus the thesis identifies the use made of trope, in a fifteenth-century poetic, to provide a comprehensive language for the discussion of meta-fictional and meta-linguistic issues. The introductory chapter examines the implications for fifteenth-century narrative of its response to an inherited (mainly) Chaucerian poetic discourse. The second section of this chapter also provides a study of the possible role of trope in narrative texts. The claim that trope is a constitutive element of narrative structures is tested by a reading of The Floure and the Leafe in section three of this chapter. In section four The Assembly of Ladies is studied as a text which exemplifies fifteenth-century narrative poems' selfconsciousness about the writing process. Chapter Two examines Chaucer's strategies towards lyric trope in Troilus and Criseyde, and then discusses Lydgate's reading of those strategies of The Temple of Glas. The objective of this chapter is to point out some of the different responses to the use of lyric tropes in poetic narrative. In Chapter Three The Kingis Quair is studied as a text which fictionalises the pleasure and confidence which may accrue from the 'mastery' or control of poetic discourse both past and present. In contrast, in Chapter Four, Skelton's Bowge of Courte presents a fiction of the anxieties of writing within a specific, prescribed poetic discourse. In this poem Skelton generates a narrative from the use of the typical anxieties of the conventional modesty topos. Skelton's Garlande or Chapelet of Laurell, provides a contrast to The Bowge for while it uses similar metaphors for its discussion of poetic issues, it constructs a fiction of poetic virtuosity; of over-confidence rather than high anxiety. Finally, in Chapter Five a study of The Isle of Ladies suggests that this text may stand as a comprehensive overview of fifteenth-century writers' knowing use of commonplace tropes and also of the relation of the individual text to its pre-given intertextually constituted, poetic discourse
635

Effect of ascorbic acid on copper deficiency in rats

Kwan, Sing Fook, 1941- January 1972 (has links)
No description available.
636

Evaluation of Compilers for MATLAB- to C-Code Translation

Muellegger, Markus January 2008 (has links)
MATLAB to C code translation is of increasing interest for science and industry. In detail two MATLAB to C compilers denoted as Matlab to C Synthesis (MCS) and Embedded MATLAB C (EMLC) have been studied. Three aspects of automatic code generation have been studied; 1) generation of reference code; 2) target code generation; 3) floating-to-fixed-point conversion. The benchmark code used aimed to cover simple up to more complex code by being viewed from a theoretical as well as practical perspective. A fixed-point filter implementation is demonstrated. EMLC and MCS offer several fixed-point design tools. MCS provides a better support for C algorithm reference generation, by covering a larger set of the MATLAB language as such. More suitable for direct target implementation is code generated from EMLC. As a result of the need to guarantee that the EMLC generated C-code allocates memory only statically, MATLAB becomes more constraint by EMLC. Functional correctness was generally achieved for each automatic translation.
637

Roles of the DOG-1 and JRH-1 helicase-like proteins in DNA repair in Caenorhabditis elegans

Youds, Jillian L. 05 1900 (has links)
Helicases perform vital roles in the cell by unwinding D N A to make it accessible for the essential processes of replication, transcription and repair. In Caenorhabditis elegans, the DOG- 1 helicase-like protein is required for polyG/polyC-tract (G/C-tract) maintenance, as dog-l animals have a mutator phenotype characterized by deletions that initiate in G/C-tracts. DOG-1 may unwind secondary structures that form in polyguanine D N A during lagging strand replication. In order to more completely understand the role of dog-1, genetic interactors were identified, dog-1 functionally interacts with the him-6/BLM helicase. Absence of recombinational repair-implicated proteins in the dog-1 background, including HIM-6/BLM, RAD-51, BRD-1/BARD1 and HIM-9/XPF, as well as the trans-lesion synthesis polymerases polKMD po/7 increased the frequency of animals with G/C-tract deletions, indicating that these pathways are important mechanisms for repair at G/C-tracts in the absence of DOG-1. These data support the hypothesis that persisting D N A secondary structures can cause replication fork stalling, which can be resolved by deletion-free or deletion-prone mechanisms. DOG-1 has highest sequence identity to human BR1P1/FANCJ, which is mutated in patients from the Fanconi Anemia (FA) subgroup J. D N A damage sensitivity experiments indicated that, like chicken F A N C J cells, dog-1 mutants were not significantly sensitive to DNA damage from X-ray or UV-irradiation, but were extremely hypersensitive to the D N A interstrand cross-linking agent UVA-activated trimethylpsoralen. Thus, DOG-1 appears to have a conserved role in cross-link repair and is the C. elegans F A N C J homolog. Characterization of the dog-1/FANCJ-relatsd helicase, Jrh-1, revealed that mutants for this putative helicase are moderately sensitive to cross-linking agents, dog-1 jrh-1 double mutants displayed a synthetic lethal phenotype characterized by excessive recombination intermediates and mitotic catastrophe in the germline. However, absence of JRH-1 did not have any effect on G/C-tract deletions, indicating that JRH-1 does not have a redundant function with DOG-1 at G/C-tracts. Absence of JRH-1 reduced the fitness of eTl and nTl translocation hétérozygotes, but not translocation homozygotes, jrh-1 was synthetically lethal with him-6/BLM and with the endonuclease mus-81, suggesting a possible role for JRH-1 in regulating the balance between different types of repair.
638

Planetinio kūno modeliavimo algoritmų tyrimas / Analysis of planetary body creation alghorithms

Mikalauskas, Vytautas 10 September 2004 (has links)
The bursted developing of 3D computer graphics on PC makes possible using it for increasing visual quality of teaching materials which are used in physic and informatic courses of secondary school. This master of science work is provided to research 3D graphic potential capabilities for interactive planetary bodies modeling. There is provided observation and analysis material about such existing modeling systems. The work contains software project for planetary body modeling system which will be used for teaching purposes. Data for system can be prepared by system’s user using Extended Markup Language (XML) standard X3D. The system makes generation and visualization of described planenetary body allowing interaction with user and providing graphic subsystem work parameters for analysis. Building of such system project requires using algorithhms which allows paralel work of PC’s central processing unit and 3D acceleration chip. They are the key for succesive system realization according users requirements. The system’s algorithms are designed in object oriented manner for making it more extensible and adjustable for needs of school’s teaching personal. It is possible to extend system functionality in the future providing demonstration of space physic laws.
639

Structural characterization of omega loop peptides from cytochrome c

Norris, Judy Barnett 08 1900 (has links)
No description available.
640

Manipulation of the Angiogenic Balance by Pharmacological Inhibition of Platelet PKC Signalling

Moncada de la Rosa,Cesar A. Unknown Date
No description available.

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