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result(s) for
"Bari, G."
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Modelling the situation of driving on the grip limit with DDPG algorithm
2018
The number of papers in the topic of autonomous vehicle research is growing exponentially. This paper addresses the problem of self driving a car on tire grip limit, in other words it gives a simple model of a race car driver. Driving is transformed into a simple deep learning problem, where the agent has one action, that is the direction in which the actual speed vector needs to be modified for the next step, and the environment state contains of the actual position and speed. The environment models the race track as a two colour map, to decide on and off track positions, and the car as a point mass with maximal possible acceleration according to the so called GG diagram. Results show that the agent can learn how to drive on the track under the described circumstances.
Journal Article
Role of the People’s Republic of China in the Activities of the Shanghai Cooperation Organisation
2022
The aim of the study is to identify the role of the People’s Republic of China in the activities of the organisation, based on the Chinese vision of its role in the Shanghai Cooperation Organisation as one of the ideological and philosophical leaders that determine its focus and ideology. In particular, China implements the principle of polycentrism in Eurasia and interstate partnership and promotes the idea of state-regulated economic globalisation. The methodology of this scientific research is based on the analytical method of studying the issues related to the topic of the scientific research. China proceeds from the concept of ensuring full sovereignty by the member states of the organisation, but against the backdrop of low development rates of national economies (up to 2–2.5%) and lack of awareness by countries of their national interests in the region, Chinese business will strengthen its expansion, relying on both the World Trade Organisation rules and using protectionist measures by absorbing ineffective business entities. China is guided by the principles of non-interference in the internal affairs of other states, while maintaining its socio-political model based on the fusion of the communist ideology and the traditional philosophical doctrines of China and the mentality of the country’s population, excluding the democracy export policy, denying the desire for undivided hegemony and to rule the world community. This is confirmed by the main key elements of the People’s Republic of China’s foreign policy, determined by the Chinese leadership.
Journal Article
Investigating the effects of roll center height in simulation, for safety-margin research
2018
Understanding the vehicle behaviour in the tire saturation region, close to the grip limit, is really important when the safety during vehicle motion is concerned. In case of autonomous vehicle research, usually the so called \"safety-margin\" is defined to describe this limit behaviour. For this, often a simulation environment is used. These environments can over-simplify suspension parameters that leads to inaccurate results, in such conditions. This paper investigates the effect of these parameters, in a given simulation software, to understand if parameter changes, eg.: roll center height, creates the expected changes in vehicle behaviour. This way it is possible to validate, if the chosen environment is \"good enough\" for our safety-margin research in the future.
Journal Article
Searching for Neutrinoless Double-Beta Decay of 130Te with CUORE
2015
Neutrinoless double-beta (0 ν β β ) decay is a hypothesized lepton-number-violating process that offers the only known means of asserting the possible Majorana nature of neutrino mass. The Cryogenic Underground Observatory for Rare Events (CUORE) is an upcoming experiment designed to search for 0 ν β β decay of 130Te using an array of 988 TeO2 crystal bolometers operated at 10 mK. The detector will contain 206 kg of 130Te and have an average energy resolution of 5 keV; the projected 0 ν β β decay half-life sensitivity after five years of livetime is 1.6 × 1026 y at 1 σ (9.5 × 1025 y at the 90% confidence level), which corresponds to an upper limit on the effective Majorana mass in the range 40–100 meV (50–130 meV). In this paper, we review the experimental techniques used in CUORE as well as its current status and anticipated physics reach.
Journal Article
Shaping a comprehensive government-supported country brand program
2020
Country brand support programs are instruments of open protectionism, which results from unilateral sanctions by foreign countries or acts as a mechanism for direct government support of national producers, creating positive perception by customers abroad and promoting goods and services to foreign markets. However, the long-term preservation of protectionist measures in the national economy leads to the loss of competitiveness by producers and the national economy as a whole. Therefore, it becomes relevant to study the programs of several states in the context of the development of national production and exports, and search for approaches to shaping a comprehensive program of government support for the country brands, which correspond to the main fair competition features in the global economy based on agreements within the WTO. This study is aimed at identifying the feasibility of transforming the “Made in Russia” initiative into a comprehensive country brand government support program. The methodological tools of the studied problem are based on expert and mutual assessments, the Delphi method, mathematical statistics, and graphical modeling. The expert assessment method was used to substantiate the expediency of protectionism for domestic producers to preserve quality and environmental friendliness of export-oriented products in the current conditions that contribute to cultivating the country’s positive image. A cause-and-effect diagram (the so-called Fishbone Diagram) developed on the basis of the K. Ishikawa model made it possible to identify the main causes and conditions for shaping a comprehensive program for the country brand government support.
Journal Article
Generating MMM diagram for defining the safety margin of self driving cars
2018
Autonomous driving, is considered as the future of mobility, and research on this topics growing exponentially. On the one hand, these vehicles must be controllable, making rapid maneuvers possible, in case of a sudden accident situation, while on the other hand their motion must be stable, to maintain directional stability under disturbances. It is important to specify the so called \"safety margin\", the range of possible motions that the vehicle can produce with keeping its stability. The limits of the possible movement of a vehicle depend on its parameters. The aim of our study is to determine which parameters affect the controllability and stability of a vehicle. To find this, we used the \"MRA moment method\" to create the \"Yaw Moment Diagram\" in our simulation environment. This method is usually used to map the possible range of motion and judge the stability and controllability of a possible motion state. Here we will use a two track vehicle model, with nonlinear tire characteristics, and complete model of suspension linkage to create the MMM diagram of a vehicle with given parameters.
Journal Article
CUORE sensitivity to Formula omitted decay
2017
We report a study of the CUORE sensitivity to neutrinoless double beta ( [Formula omitted]) decay. We used a Bayesian analysis based on a toy Monte Carlo (MC) approach to extract the exclusion sensitivity to the [Formula omitted] decay half-life ( [Formula omitted]) at [Formula omitted] credibility interval (CI) - i.e. the interval containing the true value of [Formula omitted] with [Formula omitted] probability - and the [Formula omitted] discovery sensitivity. We consider various background levels and energy resolutions, and describe the influence of the data division in subsets with different background levels. If the background level and the energy resolution meet the expectation, CUORE will reach a [Formula omitted] CI exclusion sensitivity of [Formula omitted] year with 3 months, and [Formula omitted] year with 5 years of live time. Under the same conditions, the discovery sensitivity after 3 months and 5 years will be [Formula omitted] year and [Formula omitted] year, respectively.
Journal Article
A gravity-based mounting approach for large-scale cryogenic calorimeter arrays
by
Juillard, A.
,
Yang, J.
,
Pira, C.
in
Astronomical instrumentation
,
Gravitational Physics
,
High Energy Physics
2025
Cryogenic calorimeters are among the leading technologies for searching for rare events. The CUPID experiment is exploiting this technology to deploy a tonne-scale detector to search for neutrinoless double-beta decay of 100Mo. The CUPID collaboration proposed an innovative approach to assembling cryogenic calorimeters in a stacked configuration, held in position solely by gravity. This gravity-based assembly method is unprecedented in the field of cryogenic calorimeters and offers several advantages, including relaxed mechanical tolerances and simplified construction. To assess and optimize its performance, we constructed a medium-scale prototype hosting 28 Li2 MoO4 crystals and 30 Ge light detectors, both operated as cryogenic calorimeters at the Laboratori Nazionali del Gran Sasso (Italy). Despite an unexpected excess of noise in the light detectors, the results of this test proved (i) a thermal stability better than ±0.5 mK at 10 mK, (ii) a good energy resolution of Li2 MoO4 cryogenic calorimeters, (6.6 ± 2.2) keV FWHM at 2615 keV, and (iii) a Li2 MoO4 light yield measured by the closest light detector of 0.36 keV/MeV, sufficient to guarantee the particle identification requested by CUPID.
Journal Article
Feasibility of vaccination in preventing secondary cases of hepatitis A virus infection
2005
Although the secondary transmission of hepatitis A virus (HAV) infection is preventable through vaccination, it is not known whether the vaccination of household contacts is feasible. To this end, we conducted a prospective cohort study among the household contacts, 40 years of age or less, of all persons infected with primary HAV infection (index cases) and admitted to eight hospitals in southern Italy within 7 days of onset. Household contacts were vaccinated, and serum samples were taken at vaccination and after 14 and 45 days. Secondary cases were defined as those with IgM seroconversion occurring at least two weeks after enrolment. Coprimary cases were those assumed to have had the same exposure as the index case. Susceptible cases were those who were negative for both IgG and IgM. A total of 495 household contacts participated (acceptance rate of 65%); 65% were vaccinated within 4 days of admission of the index case and 95% within 7 days. At enrolment, 196 (39.6%) household contacts were immune (IgG-positive serum). During follow-up, 19 (3.8%) were IgM-positive: 13 (2.6%) were coprimary cases and 6 (1.2%; 95% CI: 0.2–3.2) secondary cases (5 identified at 14 days from vaccination and 1 at 45 days). Of the 241 susceptible cases, 192 (79.7%) had developed IgG antibodies at 14 days and only 3 (1.2%) did not develop IgG antibodies at 45 days. The 65% acceptance rate and the finding that 95% of the participating household contacts were vaccinated within 7 days of the index case's hospitalization indicate that timely vaccination is indeed feasible. The necessity of returning for the collection of blood samples probably decreased the acceptance rate.
Journal Article
Search for double-beta decay of 130Te to the 0+ states of 130Xe with CUORE
2021
The CUORE experiment is a large bolometric array searching for the lepton number violating neutrino-less double beta decay (0νββ) in the isotope 130Te. In this work we present the latest results on two searches for the double beta decay (DBD) of 130Te to the first 02+ excited state of 130Xe: the 0νββ decay and the Standard Model-allowed two-neutrinos double beta decay (2νββ). Both searches are based on a 372.5 kg×yr TeO2 exposure. The de-excitation gamma rays emitted by the excited Xe nucleus in the final state yield a unique signature, which can be searched for with low background by studying coincident events in two or more bolometers. The closely packed arrangement of the CUORE crystals constitutes a significant advantage in this regard. The median limit setting sensitivities at 90% Credible Interval (C.I.) of the given searches were estimated as S1/20ν=5.6×1024yr for the 0νββ decay and S1/22ν=2.1×1024yr for the 2νββ decay. No significant evidence for either of the decay modes was observed and a Bayesian lower bound at 90% C.I. on the decay half lives is obtained as: (T1/2)02+0ν>5.9×1024yr for the 0νββ mode and (T1/2)02+2ν>1.3×1024yr for the 2νββ mode. These represent the most stringent limits on the DBD of 130Te to excited states and improve by a factor ∼5 the previous results on this process.
Journal Article