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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.
11

Aerodynamics and drying characteristics of grains in two-dimensional spouted beds

Kalwar, Muhammad Issa January 1991 (has links)
No description available.
12

Natural-air grain drying : modeling and validation

Maurer, Samuel Gwinn January 2011 (has links)
Typescript. / Digitized by Kansas Correctional Industries
13

Hygroscopic properties of corncobs and their application for small-scale, on-farm grain conditioning

Moncada, Luis Fernando. January 1978 (has links)
Call number: LD2668 .T4 1978 M65 / Master of Science
14

Environmental factors affecting pre-maturity alpha-amylase activity in winter wheat (Triticum aestivum)

Major, Bernard J. January 1999 (has links)
Pre-maturity <i>alpha</i>-amylase activity (PMAA) in the absence of sprouting is one of four causes of low Hagberg falling number (HFN) in UK winter wheat (<i>Triticum aestivum</i>), reducing the quality and value of milled flour. Other causes include the retention of pericarp <i>alpha</i>-amylase activity (RPAA), pre-maturity sprouting (PrMS) and post-maturity sprouting (PoMS). This thesis investigated the effects of environmental factors on PMAA which currently occurs in a variable and unpredictable fashion under UK weather conditions. A multi-site field experiment on four cultivars (Haven, Hornet, Pastiche and Riband), at four sites (Harper Adams University College, University of Nottingham, University of Aberdeen and ADAS-Bridgets) between 1994-1996 was undertaken to:- establish the frequency of the causes of low HFN; examine the relationship between grain drying-rate and PMAA; determine if it was possible to predict combine harvest HFN. A range of techniques including a visual sprouting assessment, fluorescein dibutyrate staining, iso-electric focusing and a beta-limit dextrin gel and iodine staining test were used to allow the cause of low HFN to be established. Of the forty crops analysed, 22 cases (45%) had detectable amounts of <i>alpha</i>-amylase activity. PMAA was identified solely in 2 cases (5%), in combination with PoMS in 8 cases (20%), in combination with RPAA in one case (2%), with PoMS occurring solely in 11 cases (28%). The HFN fell below the breadmaking standard of 250 s in 18 of the 36 site x year x cultivar combinations analysed. This was attributed solely to PMAA in two cases (11 %), a combination of PMAA and PoMS in a further eight cases (44%) and solely to PoMS in eight cases(44%). There were no cases where PrMS or RPAA reduced the HFN to below 250 s. The hypothesis that PMAA is related to the grain drying-rate between 40-20 % moisture content was tested. Grain drying-rate was determined by linear regression analysis using moisture content measurements made at regular intervals during grain development. In site x year x cultivar combinations where PMAA was detected the grain drying-rate was significantly (P = 0.047) lower (mean = 1.90 <i>cf</i>. 2.30% moisture loss day<sup>-1</sup>), suggesting a slow grain drying-rate enhances PMAA. However, the low frequency of occurrence of PMAA in isolation prevented quantification of this relationship. Initiation of PMAA in the grain, was shown to occur from a grain moisture content of 47.8%. A pre-harvest sample taken by hand at 850 °C-days (35 % moisture, Zadoks growth stage 85-87) was shown to enable a prediction of combine harvest HFN to be made in the absence of subsequent rainfall and PoMS. The 95 % confidence limits associated with this HFN prediction were however wide. The hypothesis that transient changes in temperature early in grain development may affect PMAA, before the onset of any grain drying-rate effects, was tested in five controlled-environment cabinet experiments. Of 36 cultivar x time of transfer combinations undertaken from a 16/ 10°C to a 26 /20°C temperature regime, six led to a significant increase (P < 0.05) arid one led to a significant decrease in PMAA. Of the 18 cultivar x time of transfer combinations undertaken from a 25 / 20°C to a 16 / 10°C temperature regime, one led to a significant increase and one led to a significant decrease in PMAA. A comparison between the field and controlled-environment experiment results highlighted that after conditions putatively stimulating PMAA had been encountered, subsequent environmental factors, such as mean temperature and relative humidity may also affect PMAA. It was concluded that PMAA can be enhanced by transient increases in temperature before the grain reaches 40% moisture content and by a slow grain drying-rate between 40-20% moisture content. The variability in the results, however, also suggested other environmental factors were influencing PMAA.
15

Development of a natural convection dryer for use in developing countries

Adeyemo, Theophilus Lalere. January 1979 (has links)
Call number: LD2668 .T4 1979 A33 / Master of Science
16

Application of silica gel for on-farm grain drying and storage in developing countries

Hsiao, Judy Yen-Chen January 2010 (has links)
Digitized by Kansas Correctional Industries
17

Static pressure drop in a fixed bed of grain as affected by grain moisture content

Ahmed, Yousef Nagi (Assalimy) January 2011 (has links)
Typescript (photocopy). / Digitized by Kansas Correctional Industries
18

Solar grain drier for small farms in northeastern Brazil

Pereira, Omar Jesus January 1978 (has links)
No description available.
19

Simultaneous heat, momentum and mass transfer in the through-flow drying of agricultural products

Brock, James Donald 05 1900 (has links)
No description available.
20

Heat transfer prediction and drying potential in a solid medium with a flighted rotating drum

Tessier, Sylvio, 1958- January 1982 (has links)
No description available.

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