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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.
21

Effect of harvest time, post-harvest storage and ripening temperature on fruit quality of reed avocado cultivar

Shikwambana, Kingsly January 2016 (has links)
Thesis (M. Sc. (Agriculture, Horticulture)) --University of Limpopo, 2016 / ‘Reed’ avocado is a late season cultivar introduced to South Africa from California. The cultivar has shown good adaptation and produces quality fruit with export potential. Its pre-harvest adaptation and production aspects have been researched and documented. However, the effect of harvest time, post-harvest storage and ripening temperature has not been comprehensively studied on this newly introduced ‘Reed’ avocado cultivar. Therefore, the aim of this work was to investigate the effect of different harvest time, post-harvest storage and ripening temperature on the quality of late season ‘Reed’ avocado fruit. Matured ‘Reed’ avocado fruit were harvested based on moisture content indexing in December (2015) and January (2016). The experiment was carried out in a factorial, arranged in a completely randomised design (CRD) with three replicates. Treatment factors were: 2 x harvest time (mid-and late), 2 x post-harvest storage (2.0 and 5.5°C), 3 x ripening temperature (16, 21 and 25°C) and 5 x ripening day (0, 2, 4, 6 and 8). Fruit were stored at 2.0 and 5.5°C for 28 days, thereafter, ripened at 16, 21 and 25°C until fully ripe. During ripening, fruit were evaluated for weight loss, skin colour, firmness, respiration rate, physiological and pathological disorders. Mid-harvest fruit had higher moisture content when compared with late harvest fruit. However, harvest time, post-harvest storage, ripening temperature and ripening time (days) significantly influenced fruit weight loss, firmness, respiration rate, ripening percentage of ‘Reed’ avocado fruit during ripening. Moreover, fruit firmness decreased faster at higher temperatures (25 and 21°C) with fruit ripening within 4 and 6 days, respectively. In addition, ripening at a lower temperature (16°C) was slower with fruit fully ripened within 8 days after withdrawal from cold storage at both harvest times. ‘Reed’ avocado fruit respiration rate followed a climacteric pattern, however, significantly higher rate at higher temperature (25°C) when compared with lower temperature (16°C) after withdrawal from cold storage during both harvest times. Interestingly, mid-harvest fruit showed high electrolyte damage after withdrawal from 2.0°C when compared with late harvest fruit at the same temperature. Furthermore, mid-harvest fruit stored at 2.0ºC and ripened at 21°C showed higher chilling injury when compared with fruit ripened at 16 and 25°C. High electrolyte leakage positively correlated (R2 = 0.242) with high chilling damage for xiv mid-harvest fruit stored 5.5°C. Treatment factors had a significant effect (P < 0.05) on lightness (L *) and hue angle (h ) but no significant effect (P > 0.05) on chroma (C *) and eye colour of ‘Reed’ avocado fruit during ripening, irrespective of harvest time. Overall results showed a visual change in ‘Reed’ avocado skin colour, with eye colour changing from green to bright yellow. Furthermore, late harvest fruit showed high post-harvest pathological diseases after removal from high temperature (5.5°C) when compared with mid-harvest fruit stored at low storage temperature (2.0°C). Ripening at a higher temperature (21 and 25°C) resulted in higher incidence of stem-end rot and body rot when compared with lower temperature (16°C) for both harvest times. Late harvest fruit showed a higher incidence of vascular browning at higher ripening temperatures (21 and 25°C) when compared with lower temperature (16°C) after withdrawal from cold storage. Moreover, overall results showed that harvest time, post-harvest storage and the ripening temperature had a profound influence on the quality of ‘Reed’ avocado fruit. In conclusion, ‘Reed’ avocado fruit can be harvested during mid- or late season and stored at recommended low temperature (2.0ºC); and thereafter, ripened at either 16 or 21ºC. In addition, future studies should focus on identifying pre-harvest practices that promote higher post-harvest fruit quality for ‘Reed’ avocado fruit under South African production environment. Keywords: ‘Reed’ avocado fruit; firmness; electrolyte leakage; respiration rate; stem-end rot; body rot; vascular browning
22

TELEMETRY ACQUISITION BOARD INCLUDING REED-SOLOMON FPGA DECODER FOR SPACE APPLICATIONS

Lassère, François, Ferréol, Max, Rocher, Jean-Pierre 10 1900 (has links)
International Telemetering Conference Proceedings / October 25-28, 1999 / Riviera Hotel and Convention Center, Las Vegas, Nevada / In order to reduce the ground segment equipment cost for small space missions, the French national space center (CNES) had the need to develop a CCSDS down-link interface board for low telemetry rates (< 1.5 Mb/s). This board performs frame synchronization and Reed-Solomon decoding. An important part of this design was the Reed-Solomon decoder development. In order to maintain low recurrent cost for this board, this decoder was realized in FPGA technology. Reed-Solomon decoding function, interleaving function (from 1 to 5) and virtual fill management are included in the same component. All set-up parameters are software programmable via the PCI bus, data and status are also available via the PCI bus under windows NT operating system. This paper presents the main features of this board and an overview of the Reed-Solomon decoder development.
23

Practical error control techniques for transmission over noisy channels

Martin, Ian January 1998 (has links)
No description available.
24

The history and development of the bassoon reed and embouchure

DeVos, Bradford R. January 1963 (has links)
Thesis (M.M.)--Boston University
25

Blind Alfred Reed: Life and Music

Olson, Ted 01 January 2016 (has links)
No description available.
26

Weed management for giant reed (Arindo donax) biomass production in Oregon

Attarian, Amir 06 March 2013 (has links)
Giant reed (Arundo donax L.) is a candidate to provide feedstock for the Portland General Electric power plant in Boardman, Oregon. Giant reed is a fast perennial grass, producing 23-27 metric tons ha⁻¹ of biomass and has the ability to adapt to diverse environments making it a good candidate for biomass production. This study tested postemergence and preemergence herbicides for controlling weeds in giant reed during the establishment year in which giant reed plants are more sensitive to weed competition. The greenhouse study demonstrated that among the tested herbicides, bromoxynil plus MCPA at 0.841 kg ai ha⁻¹, nicosulforun at 0.035 kg ha⁻¹, and dimethenamid-p at 0.735 kg ha⁻¹ did not injure giant reed. In a field study, preemergence application of dimethenamid-p at 0.735 kg ha⁻¹ followed by a postemergence application of 2,4-D amine at 0.560 kg ha⁻¹ and a postemergence application of bromoxynil plus MCPA at 0.841 kg ha⁻¹ did not injure giant reed. The presence of weeds in a field does not always mean that crop yield will be reduced and there are some periods during the growing season when weeds will not cause considerable yield loss. Therefore, predicting a critical period of weed control (CPWC) that includes the best time for weed control in giant reed could improve weed management in the field. The length of the CPWC could be different depending on the level of acceptable yield loss (AYL). Our results are reported for AYL of 5 and 10%. The CPWC started at 290 accumulated growing degree days (GDD) and ended at 820 for a 5% AYL, while for a 10% AYL, it started at 333 GDD and ended at 727 GDD. Based on the results, there are some herbicides which could be selected for further study for weed control in the giant reed and the estimated CPWC which could be used to inform weed management practices in giant reed production. / Graduation date: 2013
27

Postmodernism and its others : the fiction of Ishmael Reed, Kathy Acker, and Don DeLillo /

Ebbesen, Jeffrey, January 2006 (has links)
Texte remanié de: Thesis Ph. D.--University of Connecticut. / Bibliogr. p. 229-242.
28

Harold W. Reed : contributions to Christian higher education /

Goins, Mervyn L. January 1991 (has links)
Thesis (Ph. D.)--University of Oklahoma, 1991. / Includes bibliographical references (leaves 171-180).
29

A study of variation in the quality of oboe reeds made from Arundo donax L. (Gramieae)

Lawton, Clare Elizabeth January 1998 (has links)
No description available.
30

Fred T. Dubois, foe of the Mormons a study of the role of Fred T. Dubois in the Senate investigation of the Hon. Reed Smoot and the Mormon church, 1903-1907.

Lowe, Jay R. January 1960 (has links)
Thesis (M.A.)--Brigham Young University, Dept. of Political Science. / Electronic thesis. Also available in print ed.

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