Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

How can the quality of Garden and orchard produce be measured?

17.06.2004


Optimising and standardising trials on the resistance of orchard fruit to the harvesting and picking processes, increasingly used to determine quality, was the aim of the PhD presented by Martín Sanmartín Goñi at the en Public University of Navarre.

Handling and conservation

The harvesting, transport and conservation of fruit and garden produce is currently carried out mechanically. In these processes of product handling, they can be subject to bangs, vibrations and crushing which all have an influence on their subsequent conservation.



Given this, it is necessary to determine to what extent fruit and garden produce can resist mechanical forces. One of these mechanical properties, one which moreover provides more information than most, is the resistance to cutting.

Trials on the resistance to cutting have been used by many researchers to different ends. However, normally there is no mention in the literature of the parameters taken into account when carrying out such tests.

To address this lack of standards was precisely the aim of Martín Sanmartín Goñi’s PhD. So, after analysing the various test parameters, he concluded that the diameter is the parameter that has most influence in resistance to cutting of fruit and garden produce. Thus, for the test parameters for cutting sections to be comparable, the diameter of the cut sections have to be determined; the compression pressure exercised on them should be less than 0.08 N/mm2 and the velocity of the cutting should be less than 0.6 mm/s. The length of the cutting could be the most convenient parameter.

Trials with potatoes

In order to carry out the trials, Sanmartín Goñi used two materials: vegetable material (potato) and, as a control, an inert one (polyurethane). Apart from the diameter, another variable parameter was taken into account: the length of the cut section. Apart from these, two other important trial conditions were the compression pressure exercised and the velocity of the cutting.

Sanmartín Goñi concluded that the length of the section could be the most convenient parameter, given that this does not have a great influence on the test results.

Contact :
Iñaki Casado Redin
Nafarroako Unibertsitate Publikoa
inaki.casado@unavarra.es
(+34) 948 16 97 82

Iñaki Casado Redin | Basque research
Further information:
http://www.basqueresearch.com/berria_irakurri.asp?Gelaxka=1_1&Berri_Kod=510&hizk=I
http://www.unavarra.es

More articles from Agricultural and Forestry Science:

nachricht Researchers discover natural product that could lead to new class of commercial herbicide
16.07.2018 | UCLA Samueli School of Engineering

nachricht Advance warning system via cell phone app: Avoiding extreme weather damage in agriculture
12.07.2018 | Leibniz-Zentrum für Agrarlandschaftsforschung (ZALF) e.V.

All articles from Agricultural and Forestry Science >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: First evidence on the source of extragalactic particles

For the first time ever, scientists have determined the cosmic origin of highest-energy neutrinos. A research group led by IceCube scientist Elisa Resconi, spokesperson of the Collaborative Research Center SFB1258 at the Technical University of Munich (TUM), provides an important piece of evidence that the particles detected by the IceCube neutrino telescope at the South Pole originate from a galaxy four billion light-years away from Earth.

To rule out other origins with certainty, the team led by neutrino physicist Elisa Resconi from the Technical University of Munich and multi-wavelength...

Im Focus: Magnetic vortices: Two independent magnetic skyrmion phases discovered in a single material

For the first time a team of researchers have discovered two different phases of magnetic skyrmions in a single material. Physicists of the Technical Universities of Munich and Dresden and the University of Cologne can now better study and understand the properties of these magnetic structures, which are important for both basic research and applications.

Whirlpools are an everyday experience in a bath tub: When the water is drained a circular vortex is formed. Typically, such whirls are rather stable. Similar...

Im Focus: Breaking the bond: To take part or not?

Physicists working with Roland Wester at the University of Innsbruck have investigated if and how chemical reactions can be influenced by targeted vibrational excitation of the reactants. They were able to demonstrate that excitation with a laser beam does not affect the efficiency of a chemical exchange reaction and that the excited molecular group acts only as a spectator in the reaction.

A frequently used reaction in organic chemistry is nucleophilic substitution. It plays, for example, an important role in in the synthesis of new chemical...

Im Focus: New 2D Spectroscopy Methods

Optical spectroscopy allows investigating the energy structure and dynamic properties of complex quantum systems. Researchers from the University of Würzburg present two new approaches of coherent two-dimensional spectroscopy.

"Put an excitation into the system and observe how it evolves." According to physicist Professor Tobias Brixner, this is the credo of optical spectroscopy....

Im Focus: Chemical reactions in the light of ultrashort X-ray pulses from free-electron lasers

Ultra-short, high-intensity X-ray flashes open the door to the foundations of chemical reactions. Free-electron lasers generate these kinds of pulses, but there is a catch: the pulses vary in duration and energy. An international research team has now presented a solution: Using a ring of 16 detectors and a circularly polarized laser beam, they can determine both factors with attosecond accuracy.

Free-electron lasers (FELs) generate extremely short and intense X-ray flashes. Researchers can use these flashes to resolve structures with diameters on the...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

Leading experts in Diabetes, Metabolism and Biomedical Engineering discuss Precision Medicine

13.07.2018 | Event News

Conference on Laser Polishing – LaP: Fine Tuning for Surfaces

12.07.2018 | Event News

11th European Wood-based Panel Symposium 2018: Meeting point for the wood-based materials industry

03.07.2018 | Event News

 
Latest News

Subaru Telescope helps pinpoint origin of ultra-high energy neutrino

16.07.2018 | Physics and Astronomy

Barium ruthenate: A high-yield, easy-to-handle perovskite catalyst for the oxidation of sulfides

16.07.2018 | Life Sciences

New research calculates capacity of North American forests to sequester carbon

16.07.2018 | Earth Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>