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Hand arm vibration on a chain saw: measurement of grip force, push force and haemodynamic effects.
No full textVibration transmitted to operator’s hands by a new type of rotary pick-up for the harvest of table olives
No full textAbstract
Fruit removal is the main aim of vibratory fruit-harvesting machines used on fruit-bearing
trees. The harvesting methods vary and depend on different factors such as fruit species,
characteristics, tree size and the grower’s economic situation. New types of rotary table olive
hand harvesters have been studied. This work has two aims. The first objective is to determine
and evaluate vibration transmitted to operator’s hand. The second one is to evaluate the
combination, in terms of the best performance, of the machines used for mechanized harvesting
of table olives. Several factors have been examinated: undulating teeth variation thickness,
different rotational speed and different coating material used to reduce the impact damage on
olives
Hand arm vibration generated by a rotary pick-up for table olives harvesting
No full textAbstract: The manual harvest of olives is one of the most expensive operations in the table olives production, but the use of the
electric hand-guided machines triples the productivity. The development of these new machines leads to changes in the
harvesting methodologies and in the operator’s working behavior. These items may also affect the hand-arm vibration (HAV)
transmitted to the operators during the work. Aim of this study is to evaluate the hand-arm vibration transmitted to the
operator using an experimental electric labor saving machine with rotary combs with teeth of different dimensions covered by
silicon to minimize the damage to the drupes. Moreover, the olives removal forces have been analyzed to understand if the
force necessary to detach the drupes is correlated to the vibration levels transmitted to the operator’s hand arm. With this type
of hand held olive harvester, it has been found that higher is the fruit removal force, higher are the measured vibration levels
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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