25 research outputs found
Packet Reservation Multiple Access with Hindering States Operating in TD/CDMA terrestrial Networks
No full textRemote Laboratory Experiments in a Virtual Immersive Learning Environment
No full textThe Virtual Immersive Learning (VIL) test bench implements a virtual collaborative immersive environment, capable of integrating natural contexts and typical gestures, which may occur during traditional lectures, enhanced with advanced experimental sessions. The system architecture is described, along with the motivations, and the most significant choices, both hardware and software, adopted for its implementation. The novelty of the approach essentially relies on its capability of embedding functionalities that stem from various research results (mainly carried out within the VICOM national project), and “putting the pieces together” in a well-integrated framework. These features, along with its high portability, good flexibility, and, above all, low cost, make this approach appropriate for educational and training purposes, mainly concerning measurements on telecommunication systems, at universities and research centers, as well as enterprises. Moreover, the methodology can be employed for remote access to and sharing of costly measurement equipment in many different activities. The immersive characteristics of the framework are illustrated, along with performance measurements related to a specific application
NeBULA (Network-Based User-Location Aware): a novel location sensing system within a WLAN environment
No full textPhalangeal quantitative ultrasound and bone mineral density in evaluating cortical bone loss. a study in postmenopausal women with hyperparathyroidism and subclinical iatrogenic hyperthyroidism
No full textTwenty-five postmenopausal women with primary hyperparathyroidism (PHPT) and 30 age-matched women with subclinical hyperthyroidism (sHTH) were studied to assess cortical bone loss. One hundred two healthy women were also recruited. Bone mineral density (BMD) was measured by dual-energy X-ray absorptiometry at lumbar spine (LS), femoral neck (FN) and femoral total (FT), and at one-third of the radius (R). Amplitude-dependent speed of sound (ADSoS) and Ultrasound Bone Profile Index (UBPI) were also evaluated using phalangeal quantitative ultrasound (QUS). A significant correlation was found between QUS and BMD at LS (ADSoS, p < 0.05) and R (ADSoS and UBPI, p < 0.001) in controls. QUS significantly correlated with BMD at LS, FN (p < 0.01), and FT (p < 0.001) in sHTH. No correlations were found in the PHPT group. Mean T-score values of all parameters were significantly lower in patients compared with controls (p < 0.001); however, they did not differ between PHPT and sHTH patients. T-score of R, ADSoS, and UBPI was reduced compared with other sites (p < 0.001) in both diseases. In postmenopausal women with PHPT and sHTH, bone loss is mainly detectable at cortical level. However, qualitative and/or structural changes of bone could account for the lack of correlations between these 2 techniques at cortical sites
Effects of age on the urinary excretion of total and non-dialyzable hydroxyproline
No full textThis study was carried out in order to investigate the effects of age on the urinary excretion of total and non-dialyzable hydroxyproline (OHPr) in normal subjects. We found that total urinary OHPr was negatively correlated with age but, by means of partial regression analysis, no correlation was found after correction for changes in creatinine clearance; on the contrary, non-dialyzable OHPr showed a statistically significant negative correlation with age (r=-0.56) even when creatinine clearance was held constant (p<0.05). A highly significant direct correlation was found between total and non-dialyzable OHPr in the whole group (r=0.54) and when only premenopausal women and men under 60 years of age were considered (r=0.51). No correlation was found when postmenopausal women and men more than 60 year-old were taken into account. Our data appear to indicate that also the decrease in osteogenetic activity is responsible for the physiological late involutional bone loss; they also show the importance of hormonal changes in inducing an uncoupling between bone formation and resorption. © 1984 Springer-Verlag
FALSELY NORMAL VALUES OF INTACT PARATHYRIN IN SERUM OF PATIENTS WITH MILD PRIMARY HYPERPARATHYROIDISM
No full text[No abstract available
Study of effects of Fipronil and Fipronil-sulfone on meat nutritional quality and validation of confirmatory GC-MS/MS method for their analysis
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