113 research outputs found
Evaluation of passive cooling system in plywood enclosure for agricultural robot prototype
Received: February 1st, 2021 ; Accepted: March 27th, 2021 ; Published: April 29th, 2021 ; Correspondence: [email protected] use of autonomous robots in agriculture has been increasing rapidly in recent
years, but is hampered by the complexity of data recording and processing. The prototyping
process involves many changes to the housing design during development. Using laser cutting to
make a housing is more convenient, faster and cheaper than milling or casting if only one body
needs to be made. To speed up the production of autonomous robot prototypes, the body was
made of birch plywood using laser-cut parts. The study analyses the efficiency of passive cooling
to make sure that birch wood plywood is suitable for the production of a robotic body for outdoor
use in agriculture. Under laboratory conditions, temperature measurements were made inside and
outside the housing to determine how the heat released by the electronic components dissipates
into the environment. An exponential model with a static coefficient and a time constant can be
used to determine the recommended operating time at different ambient temperatures when the
allowable operating temperature of the component is known. Air flow and heat transfer
simulations were performed to represent heat dissipation. Birch plywood can be used for the
production of prototype enclosures for agricultural robots, but the design must provide
technological solutions for heat dissipation to prevent overheating of electronic components
Experimental efficiency evaluation of 445 nm semiconductor laser for robotized weed control applications
Robotized weed control is one of perspective approaches for decreasing ecological
impact of farming. Although current level of technology development allows robotized weed
control to be economically reasonable only in specific applications, it is only a matter of time to
introduce them in full-scale industrial farming. In general terms weed control using agricultural
robots consist of two parts: recognition and spatial localization of weeds (distinguishing them
from crops) and precision application of some kind of growth limiting activity. Recognition and
localization is usually carried out using computer vision solutions (image filtering and
transformations, artificial neural networks etc.). Growth limiting in its turn is performed by
mechanical, precise chemical, thermal, cryogenic or other means. This article covers application
of laser radiation for thermal destruction of unwanted plant canopies. In most cases CO2 type
lasers with 10.6 µm wavelength is used as they are affordable and they are applicable to use with
plant biomass due to their spectral characteristics. Drawbacks of CO2 lasers are low efficiency,
size, weight and complex maintenance. In recent years relatively powerful short-wavelength
semiconductor lasers have became broadly available on market. Light absorption of healthy green
leaves is much better in blue-UV spectrum than in green, far infrared and near infrared, which is
almost completely reflected by leaves. Thus an experimental study of using 12 W output 445 nm
blue semiconductor laser for weed canopy cutting was carried out. The experiments were
performed with direct laser radiation, the laser module was positioned using robotic manipulator
with different speeds and cutting patterns
Examining vortex-induced vibration through convolutional neural networks
This research is supported by the projects GA21-31457S ”Fast flow-field prediction using deep
neural networks for solving fluid-structure interaction problems”
Design and characterization of the beam monitor detectors of the Italian National Center of Oncological Hadron-therapy (CNAO)
Characterization of a front-end electronics for the monitoring and control of hadrontherapy beams
Abstract An integrated 64-channel device for the read-out of parallel plate pixel and strip ionization detectors has been developed by the INFN and University of Torino. The detectors will be used for the monitoring and control of hadrontherapy beams. The ASIC has been designed in CMOS 0.8 μm technology and it is based on a current-to-frequency converter followed by a synchronous counter. In this paper, we present a detailed characterization of the device done with 113 chips
'Ionizing radiation effects on a 64-channel charge measurement ASIC designed in CMOS 0.35 μm technology'
A 64-channel circuit Application Specific Integrated Circuit (ASIC) for charge measurement has been designed in CMOS 0.35mm technology and characterized with electrical tests. The ASIC has been conceived to be used as a front-end for dosimetry and beam monitoring detector read-out. For that application, the circuitry is housed at a few centimeters from the irradiated area of the detectors and therefore radiation damages can affect the chip performances. The ASIC has been tested on an X-ray beam. In this paper, the results of the test and an estimate of the expected lifetime of the ASIC in a standard radio-therapeutical treatment environment are presented. An increase of the background current of 2 fA/Gy has been observed at low doses, whilst the gain changes by less than 3% when irradiated up to 15 kGy. Furthermore it has been assessed that, when used as an on-line beam monitor and the annealing effect has been taken into account, the background current increase is � 440 fA/year
Effect of dietary zinc (ii) chelate complex and zinc (ii) enriched soybean meal on selected parameters of in vivo caecal fermentation in laying hens (lohman brown)
Online beam monitoring in the treatment of ocular pathologies at the INFN Laboratori Nazionali del Sud-Catania.
Long-term changes in the inorganic nitrogen output in European ICP Integrated Monitoring catchments – an assessment of the impact of internal nitrogen-related parameters and exceedances of critical loads of eutrophication
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