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A performance monitoring system for a mechanical cantaloupe harvesterLopes, Normando Vasconcelos, 1938- January 1975 (has links)
No description available.
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Physico-chemical properties and selected nutritional components of Wild Medlar (Vangueria Infausta) fruit harvested at two haevesting timeMothapo, Matholo Joyce January 2014 (has links)
Thesis (M.Sc. (Plant Production)) -- University of Limpopo, 2014 / Wild medlar (Vangueria infausta subsp. infausta) is a popular indigenous fruit available and consumed by rural communities in Limpopo Province, South Africa. Inadequate post-harvest practices in indigenous fruit plants including V. infausta fruit forms major constrains in expanding their production. There is scanty information documented on neither objective nor subjective harvesting indices of indigenous fruit plants consumed by locals in sub-Saharan Africa. Thus, the objective of this study was to determine the effect of harvesting time on physico-chemical properties and selected nutritional composition of V. infausta fruit. Fruits were harvested twice, where two harvesting times were regarded as treatments and each tree as replication. The reduction for fruit weight, sugar content and sugar/acid ratio was highly significant (P ≤ 0.05), whereas for average fruit diameter, seed weight, acid ratio and pH content this may imply that the listed parameters are treatment which was non-significant (P ≤ 0.05). The treatment reduced P, K, Mn and Fe by 33%, 18%, 3% and 7%, respectively. On the other hand, treatments had no effect on N and Ca. The reduction of phosphorus was highly significant (P ≤ 0.05), whereas for N, K, Ca, Mn and Fe treatment impact was non-significant (P ≤ 0.05). Similarly, the treatment consistently reduced moisture content and increased dry matter and crude protein of V. infausta by 76%, 300% and 7%, respectively. The reduction of moisture content, increase in dry matter was highly significant (P ≤ 0.05), whereas crude protein treatment impact was non-significant (P ≤ 0.05). The data indicated that the best time to harvest V. infausta fruit was during January when fruits were cosmetically appealing and not wrinkled. This study demonstrated that there was less variation in some measured objective harvesting indices of V. infausta fruit harvested at two harvesting time. More work would be required to do physico-chemical properties and selected mineral elements analysis from wide growth habitat for conclusive recommendations.
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The convergence of parametric resonance and vibration energy harvestingJia, Yu January 2014 (has links)
No description available.
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EFFECTS OF PARENT PLANT NUTRITION AND TIME OF HARVEST ON GERMINATION CHARACTERISTICS OF TWO GRASS SPECIES (GERMINATION RATE, FERTILITY)Paul, Nancy Elizabeth, 1960. January 1986 (has links)
No description available.
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Pneumatic harvesting of jojoba seedsYazici, Erol, 1961- January 1989 (has links)
A pneumatic harvesting method for jojoba seed was investigated. By constructing a stationary experimental unit, the motion of jojoba seeds and stones, which were close in size and weight to seeds, were examined under the effect of positive, negative, and a combination of both pressures. It was determined that there was a reasonable difference in the motion depending upon test conditions and head design. A vacuum head was designed based on the observations and data obtained from the experiments. Using this head it was possible to pick up jojoba seed without picking up stones. A nonstationary unit was constructed to examine the effect of ground speed on picking efficiency. Results showed that a cleaner harvest using a normal ground speed can be obtained with the new head than with conventional equipment. A blowing head was added to windrow seeds and increase the capacity of the machine. It was determined that when the two heads were used together harvesting field capacity increased, however reduced efficiency was found.
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Development of computer aided design for the effective design of micro-catchments in arid climatesNoura, Nader January 2002 (has links)
No description available.
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Development and application of PARCHED-THIRST : a user-friendly agrohydrological model for improving dryland cropping systemsYoung, Mark Damion Bede January 2002 (has links)
No description available.
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An economic analysis of early potato harvestingWhite, Benedict January 1989 (has links)
No description available.
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Efficient power management design for energy harvesting biomedical applicationsChen, Zhi Yuan January 2018 (has links)
University of Macau / Faculty of Science and Technology. / Department of Electrical and Computer Engineering
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Economic feasibility of mechanical strawberry harvesting in Oregon : estimated private and social benefits and costsHussen, Ahmed M. 08 May 1978 (has links)
At its peak, Oregon produced 21 percent of the nation's
total commercial strawberry production. However, since
1971, Oregon's share of strawberry production has been
declining steadily. In fact, for the last three years
strawberry production in Oregon constitutes only 8 percent
of the nation's total production, which is the lowest since
the end of the Korean War (Figure 1). Among other factors,
the increase in harvest cost without an offsetting increase
in the farm prices of strawberries, is the main cause for
the continuing decline of strawberry production in Oregon.
Decrease in the supply of strawberry pickers is the
main cause for the upward trend of the strawberry harvest
cost in Oregon. Particularly, since 1973, due to enactment
of the child labor law, the shortage in the supply of strawberry
pickers in Oregon has intensified, causing further
escalation in harvest cost. Thus, in order to alleviate
the problems associated with harvest cost, since 1967,
Oregon has been actively seeking to mechanize its strawberry
harvest.
The principal objective of this thesis has been to
evaluate the economic feasibility of mechanical strawberry
harvest in Oregon. As demonstrated in Chapter V, depending
on the assumptions about the quality and the average yield
of the strawberry varieties that would eventually be harvested
mechanically, and the efficiency of the harvester;
the expected savings per acre to the strawberry growers from
the use of mechanical harvester was shown to range from a
net saving of $523.50 to a net loss of $186.76 (Table 9).
Even though negative savings are shown to appear when extremely
unfavorable conditions are assumed, in the majority
of cases discussed in Chapter V, the implementation of
mechanical strawberry harvesting in Oregon is found to be
associated with significant positive returns to the growers.
In addition, in Chapter VI, under certain conditions
which are expected to prevail if mechanization of strawberry
harvest become a reality in Oregon, the annual gross
and net 'social rate of returns' were estimated to be 330
percent and 95.7 percent respectively. The difference between
the gross and net social rate of return is the wage
loss of the displaced workers. Based on the above social
return figures and the estimated savings to the growers,
it appears that mechanical strawberry harvesting is an
economically viable alternative that could eventually
solve the problem of the growing shortage of strawberry
pickers in Oregon. / Graduation date: 1978
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