597 research outputs found
Hand arm vibration generated by a rotary pick-up for table olives harvesting
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.  Keywords: HAV, portable olive shakers, rotary pick-up, table olive
Rare jaw bone tumor: The importance of multidisciplinary management and minimally invasive treatment
Objective: The aim of this study was to present a mini review of oral Cementoblastoma and to report a particular case of this tumor. The Cementoblastoma is a rare benign lesion that represents less than 1-6% of all odontogenic tumors. Cementoblastoma, in the current WHO classification of odontogenic tumors, falls under the category of mesenchymal tumors (WHO 2017) and it is characterized by the proliferation of cementum-like tissue and, in all cases, tends to be associated with an erupting permanent tooth, most often the first molar.
Case Presentation: A 15-year-old female presented a great Cementoblastoma with cortical expansion that affected the left mandibular body, extending from the canine to the first premolar (size 28x24 mm) and involving the mandibular canal. Surgery was performed under general anesthesia with total excision of the lesion, which was then sent for histological analysis. Due to the high risk of nerve injuries and the extreme fragility of the remaining bone after surgery, which required plates and intermaxillary blockage, the surgical site was regenerated with an iliac crest graft together with autologous and synthetic bone.
Results: For the mini-review, 107 articles were found, but only 26 were selected. The patient was monitored for 12 months after surgery; a perfect healing was reported without complications, and she showed no signs of
recurrence.
Conclusions: This case report emphasizes the usefulness of clinical choices in a rare case of cementoblastoma of great size in a very young patient. In this condition, finding the most effective eradicative and reconstructive treatment, following the last published protocols, could achieve optimal clinical and psychological patient outcomes
Dental pathology in present-day and copper age samples
Dental paleopathology has become an excellent
discipline to reconstruct the oral health of ancient
populations and its trend from the past to the present
day, especially regarding dietary habits. Our preliminary
research aims to perform a comparative analysis on
dental health status of two widely chronologically
distant samples from Sardinia: the first one dates back
to the Copper Age (III mill. B.C.) and comes from a
collective hypogean burial named Scab’e Arriu (Siddi,
SU), the second one is composed by extracted teeth
of present-day individuals, collected during some
traineeships at the Department of Surgical Science of
the Dentistry School, in Cagliari
Baryon Magnetic Moments and Proton Spin: A Model with Collective Quark Rotation
We analyse the baryon magnetic moments in a model that relates them to the
parton spins , , , and includes a contribution
from orbital angular momentum. The specific assumption is the existence of a
3-quark correlation (such as a flux string) that rotates with angular momentum
around the proton spin axis. A fit to the baryon magnetic
moments, constrained by the measured values of the axial vector coupling
constants , , yields , , where the error is a theoretical
estimate. A second fit, under slightly different assumptions, gives , with no constraint on . The
model provides a consistent description of axial vector couplings, magnetic
moments and the quark polarization measured in deep
inelastic scattering. The fits suggest that a significant part of the angular
momentum of the proton may reside in a collective rotation of the constituent
quarks.Comment: 16 pages, 3 ps-figures, uses RevTeX. Abstract, Sec. II, III and IV
have been expande
The Infertility-Related Stress Scale: Validation of a Brazilian–Portuguese Version and Measurement Invariance Across Brazil and Italy
Infertility constitutes an essential source of stress in the individual and couple's life. The Infertility-Related Stress Scale (IRSS) is of clinical interest for exploring infertility-related stress affecting the intrapersonal and interpersonal domains of infertile individuals' lives. In the present study, the IRSS was translated into Brazilian-Portuguese, and its factor structure, reliability, and relations to sociodemographic and infertility-related characteristics and depression were examined. A sample of 553 Brazilian infertile individuals (54.2% female, mean aged 36 ± 6 years) completed the Brazilian-Portuguese IRSS (IRSS-BP), and a subsample of 222 participants also completed the BDI-II. A sample of 526 Italian infertile individuals (54.2% female, mean aged 38 ± 6 years) was used to test for the IRSS measurement invariance across Brazil and Italy. Results of exploratory structural equation modeling (ESEM) indicated that a bifactor solution best represented the structure underlying the IRSS-BP. Both the general and the two specific intrapersonal and interpersonal IRSS-BP factors showed satisfactory levels of composite reliability. The bifactor ESEM solution replicated well across countries. As evidence of relations to other variables, female gender, a longer duration of infertility, and higher depression were associated with higher scores in global and domain-specific infertility-related stress. The findings offer initial evidence of validity and reliability of the IRSS-BP, which could be used by fertility clinic staff to rapidly identify patients who need support to deal with the stressful impact of infertility in the intrapersonal and interpersonal life domains, as recommended by international guidelines for routine psychosocial care in infertility settings
Recent deformation at Campi Flegrei caldera (Italy) detected by DinSar and leveling techniques
The Campi Flegrei caldera, a volcanic and densely populated area located to the west
of Napoli (Italy), was characterized by rapid ground deformation during 1970-72 and
1982-84, for a total amount of 3.5 m in the city of Pozzuoli. Since 1985 a slow deflation
was active, with episodic microcrises of uplifts.
A new and consistent uplift event is now going on, beginning in November 2004, as
revealed by spatial and terrestrial geodetic techniques.
In particular, we adopt almost all the available ENVISAT ASAR data acquired from
both ascending and descending orbits during 2002-2006, to generate mean deformation
velocity maps and time series with spatial resolution of about 100 m. The maps
are computed following the Small BAseline Subset (SBAS) approach (Berardino et
al., 2002), that implements an appropriate combination of differential interferograms
generated from SAR data pairs (60 SAR images for this work).
In addition to satellite observations, we show data from the high precision levelling network of the INGV-Osservatorio Vesuviano, consisting in about 320 benchmarks.
Levelling measurements are regularly carried out on both the whole network and along
the coast line; in case of a bradyseismic crisis, the temporal sampling is strongly increased.
Both DInSAR and levelling data evidence the maximum value of the vertical displacement
near the city of Pozzuoli.
We model the observed deformation by means of 3D pressurized point-source and
extended source, performing inversions to constrain their shape and location. The resulting
sources are also compared with that inverted for the 1982-84 unrest.UnpublishedWienope
Brief Communication: Rapid mapping of landslide events: the 3 December 2013 Montescaglioso landslide, Italy
We present an approach to measure 3-D surface deformations caused by large,
rapid-moving landslides using the amplitude information of high-resolution,
X-band synthetic aperture
radar (SAR) images. We exploit SAR data captured by the COSMO-SkyMed
satellites to measure the deformation produced by the 3 December 2013
Montescaglioso landslide, southern Italy. The deformation produced by the
deep-seated landslide exceeded 10 m and caused the disruption of a
main road, a few homes and commercial buildings. The results open up the
possibility of obtaining 3-D surface deformation maps shortly after the
occurrence of large, rapid-moving landslides using high-resolution SAR data
Recent deformation at Campi Flegrei caldera (Italy) detected by DinSar and leveling techniques
The Campi Flegrei caldera, a volcanic and densely populated area located to the west
of Napoli (Italy), was characterized by rapid ground deformation during 1970-72 and
1982-84, for a total amount of 3.5 m in the city of Pozzuoli. Since 1985 a slow deflation
was active, with episodic microcrises of uplifts.
A new and consistent uplift event is now going on, beginning in November 2004, as
revealed by spatial and terrestrial geodetic techniques.
In particular, we adopt almost all the available ENVISAT ASAR data acquired from
both ascending and descending orbits during 2002-2006, to generate mean deformation
velocity maps and time series with spatial resolution of about 100 m. The maps
are computed following the Small BAseline Subset (SBAS) approach (Berardino et
al., 2002), that implements an appropriate combination of differential interferograms
generated from SAR data pairs (60 SAR images for this work).
In addition to satellite observations, we show data from the high precision levelling network of the INGV-Osservatorio Vesuviano, consisting in about 320 benchmarks.
Levelling measurements are regularly carried out on both the whole network and along
the coast line; in case of a bradyseismic crisis, the temporal sampling is strongly increased.
Both DInSAR and levelling data evidence the maximum value of the vertical displacement
near the city of Pozzuoli.
We model the observed deformation by means of 3D pressurized point-source and
extended source, performing inversions to constrain their shape and location. The resulting
sources are also compared with that inverted for the 1982-84 unrest
The 2004–2006 uplift episode at Campi Flegrei caldera (Italy): Constraints from SBAS-DInSAR ENVISAT data and Bayesian source inference
We investigate the 2004–2006 uplift phase of Campi
Flegrei caldera (Italy) by exploiting the archive of ascending
and descending ENVISAT SAR data acquired from
November 2002 to November 2006. The SBAS-DInSAR
technique is applied to generate displacement mean velocity
maps and time series. An appropriate post-processing step is
subsequently applied to map the areas whose temporal
deformation behavior is correlated with that of the
maximum uplift zone. Our results show that the
deformation also extends outside the volcanological limits
of the Neapolitan Yellow Tuff caldera, without significant
discontinuities. The DInSAR data are inverted by
considering a finite spheroid and an isotropic pointsource.
The inversion results suggest that the new uplift is
characterized by a source location similar to the previous
small uplift event of 2000 and to the long term subsidence
of the 1990’s. In particular, the source is located at a depth
of about 3.2 km and very close to the city of Pozzuoli (about
800 m offshore, to the SW); the associated volume variation
is about 1.1 106 m3/year.PublishedL073081.10. TTC - TelerilevamentoJCR Journalreserve
Sardinia Radio Telescope wide-band spectral-polarimetric observations of the galaxy cluster 3C 129
We present new observations of the galaxy cluster 3C 129 obtained with the
Sardinia Radio Telescope in the frequency range 6000-7200 MHz, with the aim to
image the large-angular-scale emission at high-frequency of the radio sources
located in this cluster of galaxies. The data were acquired using the
recently-commissioned ROACH2-based backend to produce full-Stokes image cubes
of an area of 1 deg x 1 deg centered on the radio source 3C 129. We modeled and
deconvolved the telescope beam pattern from the data. We also measured the
instrumental polarization beam patterns to correct the polarization images for
off-axis instrumental polarization. Total intensity images at an angular
resolution of 2.9 arcmin were obtained for the tailed radio galaxy 3C 129 and
for 13 more sources in the field, including 3C 129.1 at the galaxy cluster
center. These data were used, in combination with literature data at lower
frequencies, to derive the variation of the synchrotron spectrum of 3C 129
along the tail of the radio source. If the magnetic field is at the
equipartition value, we showed that the lifetimes of radiating electrons result
in a radiative age for 3C 129 of t_syn = 267 +/- 26 Myrs. Assuming a linear
projected length of 488 kpc for the tail, we deduced that 3C 129 is moving
supersonically with a Mach number of M=v_gal/c_s=1.47. Linearly polarized
emission was clearly detected for both 3C 129 and 3C 129.1. The linear
polarization measured for 3C 129 reaches levels as high as 70% in the faintest
region of the source where the magnetic field is aligned with the direction of
the tail.Comment: 19 pages, 17 figures, accepted for publication in MNRA
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