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Search Results: 1 - 10 of 189932 matches for " G. Bonomi "
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Hypernuclei Production by K- at rest
G. Bonomi
Physics , 2011,
Abstract: The creation of a hypernucleus requires the injection of strangeness into the nucleus. This is possible in different ways, mainly using pi+ or K- beams on fixed targets. A review of hypernuclei production by K- at rest is here presented. When a K- stops inside a nucleus it can undergo the so called "strangeness-exchange reaction", in which a neutron is replaced by a Lambda with the emission of a pion. By precisely studying the outgoing pions both the binding energy and the formation probability of the hypernuclei can be measured. New measurements from the FINUDA experiment on 7Li, 9Be, 13C and 16O, coupled with previous measurements on 12C and 16O, allowed for the first time the study of the formation of hypernuclei as a function of the atomic mass number A. The new measurements also offered the possibility of disentangling the effects due to atomic wave-function of the captured K- from those due to the pion optical nuclear potential and from those due to the specific hypernuclear states. These new results on the study of the hypernuclei production by K- at rest are here presented and discussed.
Assessment of Human Ambulatory Speed by Measuring Near-Body Air Flow
Alberto G. Bonomi,Stefano Salati
Sensors , 2010, DOI: 10.3390/s100908705
Abstract: Accurate measurements of physical activity are important for the diagnosis of the exacerbation of chronic diseases. Accelerometers have been widely employed in clinical research for measuring activity intensity and investigating the association between physical activity and adverse health conditions. However, the ability of accelerometers in assessing physical activity intensity such as walking speed has been constrained by the inter-individual variability in sensor output and by the necessity of developing unobtrusive low-power monitoring systems. This paper will present a study aimed at investigating the accuracy of a wearable measuring system of near-body air flow to determine ambulatory speed in the field.
The EU-ETS scheme and the forest credits: analysis of possible scenarios for the period 2013-2020
Bonomi A,Droghei G,Lumicisi A
Forest@ , 2009, DOI: 10.3832/efor0601-006
Abstract: According to art. 3.3 and 3.4 of the Kyoto Protocol it is possible to achieve the emissions reductions goals through removals by sinks resulting mostly from afforestation, reforestation and forest management activities. At the moment the EU-ETS scheme does not allow the trade of LULUCF credits, though the member states can use the RMUs or develop CDM projects on afforestation and reforestation (tCER/lCER) to achieve the emissions reductions goals. This paper will focus on the impact on the EU-ETS allowance price of the trade of LULUCF credits and will analyze the key-role that the rewarding of avoided deforestation credits (REDD credits) could play against the deforestation of Amazon Rainforest.
Inversion of electrical conductivity data with Tikhonov regularization approach: some considerations
G. P. Deidda,E. Bonomi,C. Manzi
Annals of Geophysics , 2003, DOI: 10.4401/ag-3427
Abstract: Electromagnetic induction measurements, which are generally used to determine lateral variations of apparent electrical conductivity, can provide quantitative estimates of the subsurface conductivity at different depths. Quantitative inference about the Earth's interior from experimental data is, however, an ill-posed problem. Using the generalised McNeill's theory for the EM38 ground conductivity meter, we generated synthetic apparent conductivity curves (input data vector) simulating measurements at different heights above the soil surface. The electrical conductivity profile (the Earth model) was then estimated solving a least squares problem with Tikhonov regularization optimised with a projected conjugate gradient algorithm. Although the Tikhonov approach improves the conditioning of the resulting linear system, profile reconstruction can be surprisingly far from the desired true one. On the contrary, the projected conjugate gradient provided the best solution without any explicit regularization ( a= 0) of the objective function of the least squares problem. Also, if the initial guess belongs to the image of the system matrix, Im(A), we found that it provides a unique solution in the same subspace Im(A).
Antiproton annihilation on light nuclei at very low energies
K. V. Protasov,G. Bonomi,E. Lodi Rizzini,A. Zenoni
Physics , 1999, DOI: 10.1007/s100500050413
Abstract: The recent experimental data obtained by the OBELIX group on $\bar{p}$D and $\bar{p}^4$He total annihilation cross sections are analyzed. The combined analysis of these data with existing antiprotonic atom data allows, for the first time, the imaginary parts of the S-wave scattering lengths for the two nuclei to be extracted. The obtained values are: $Im a^{sc}_0 = [- 0.62 \pm 0.02 ({stat}) \pm 0.04 ({sys})] fm$ for $\bar{p}$D and $Im a^{sc}_0 = [- 0.36\pm 0.03({stat})^{+0.19}_{-0.11}({sys})] fm$ for $\bar{p}^4$He. This analysis indicates an unexpected behaviour of the imaginary part of the $\bar{p}$-nucleus S-wave scattering length as a function of the atomic weight A: $|Im a^{sc}_0|$ ($\bar{p}$p) > $|Im a^{sc}_0|$ ($\bar{p}$D) > $|Im a^{sc}_0|$ ($\bar{p}^4$He).
On the different role of protons and neutrons in antinucleon annihilations on nuclei
A. Bianconi,G. Bonomi,M. P. Bussa,G. Gomez,E. Lodi Rizzini,L. Venturelli,A. Zenoni
Physics , 2000,
Abstract: We compare data of antineutron and antiproton annihilation cross sections on different targets at very low energies. After subtracting Coulomb effects, we observe that the ratio between the antineutron proton and antiproton proton annihilation cross sections is an oscillating function of the energy at momenta smaller 300 MeV/c. This nontrivial behavior is confirmed by the analysis of the relative number of antiproton-neutron and antiproton-proton annihilations in nuclei. We show that a part of the strong shadowing phenomena in antiproton-nucleus annihilations can be explained in terms of this oscillation, while a part requires different explainations.
Analysis of bioreactor experimental data by the application of metabolic pathway stoichiometry to polyhydroxyalkanoate production by Alcaligenes Eutrophus
Brazilian Journal of Chemical Engineering , 1999,
Abstract: In biochemical processes, the stoichiometry can be the result of macroscopic balances (where the microorganism is specified by the elementary composition and only the chemical reactions of the conversion process are considered) or the balances of the metabolic pathway, where biochemical knowledge available for metabolic reactions, in addition to the chemical characteristics of the system, are considered. It is possible to identify several linear relationships among the conversion rates in these processes. While several rates are measured, others can be calculated. If a calculated conversion rate is also measured, measurement errors or errors of the described model can be detected or even diagnosed by comparing these values, and accurate estimates can be obtained by combining them.
Weight-Loss Induced Changes in Physical Activity and Activity Energy Expenditure in Overweight and Obese Subjects before and after Energy Restriction
Alberto G. Bonomi, Stijn Soenen, Annelies H. C. Goris, Klaas R. Westerterp
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0059641
Abstract: Activity energy expenditure (AEE) is the component of daily energy expenditure that is mainly influenced by the amount of physical activity (PA) and by the weight of the body displaced. This study aimed at analyzing the effect of weight loss on PA and AEE. The body weight and PA of 66 overweight and obese subjects were measured at baseline and after 12 weeks of 67% energy restriction. PA was measured using a tri-axial accelerometer for movement registration (Tracmor) and quantified in activity counts. Tracmor recordings were also processed using a classification algorithm to recognize 6 common activity types engaged in during the day. A doubly-labeled water validated equation based on Tracmor output was used to estimate AEE. After weight loss, body weight decreased by 13±4%, daily activity counts augmented by 9% (95% CI: +2%, +15%), and this increase was weakly associated with the decrease in body weight (R2 = 7%; P<0.05). After weight loss subjects were significantly (P<0.05) less sedentary (–26 min/d), and increased the time spent walking (+11 min/d) and bicycling (+4 min/d). However, AEE decreased by 0.6±0.4 MJ/d after weight loss. On average, a 2-hour/day reduction of sedentary time by increasing ambulatory and generic activities was required to restore baseline levels of AEE. In conclusion, after weight loss PA increased but the related metabolic demand did not offset the reduction in AEE due to the lower body weight. Promoting physical activity according to the extent of weight loss might increase successfulness of weight maintenance.
Limits on the low energy antinucleon-nucleus annihilations from the Heisenberg principle
A. Bianconi,G. Bonomi,M. P. Bussa,E. Lodi Rizzini,L. Venturelli,A. Zenoni
Physics , 2000, DOI: 10.1209/epl/i2001-00264-2
Abstract: We show that the quantum uncertainty principle puts some limits on the effectiveness of the antinucleon-nucleus annihilation at very low energies. This is caused by the fact that the realization a very effective short-distance reaction process implies information on the relative distance of the reacting particles. Some quantitative predictions are possible on this ground, including the approximate A-independence of antinucleon-nucleus annihilation rates.
Annihilation of antiprotons on nuclear targets at low energies: a simple analysis
A. Bianconi,G. Bonomi,E. Lodi Rizzini,L. Venturelli,A. Zenoni
Physics , 1999,
Abstract: We set up a plane wave impulse approximation (PWIA) formalism for the analysis of the annihilation cross sections of antinucleons on nuclear targets at very low momenta (below 100 MeV/c), where semiclassical approximations can't be applied. Since, as we test here, PWIA fails in reproducing the unexpected ``inversion'' behavior of the $\bar{p}p$ and $\bar{p}-$nucleus annihilation cross sections found in a recent experiment\cite{obe1,obe2} we discuss some further possibilities, with a special attention to the optical potential model.
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