Heavy flavours in AA collisions: production, transport and final spectra

A multi-step setup for heavy-flavour studies in high-energy nucleus-nucleus (AA) collisions --- addressing within a comprehensive framework the initial Q-Qbar production, the propagation in the hot medium until decoupling and the final hadronization and decays --- is presented. The initial hard production of Q-Qbar pairs is simulated using the POWHEG pQCD event generator, interfaced with the PYTHIA parton shower. Outcomes of the calculations are compared to experimental data in pp collisions and are used as a validated benchmark for the study of medium effects. In the AA case, the propagation of the heavy quarks in the medium is described in a framework provided by the relativistic Langevin equation. For the latter, different choices of transport coefficients are explored (either provided by a perturbative calculation or extracted from lattice-QCD simulations) and the corresponding numerical results are compared to experimental data from RHIC and the LHC. In particular, outcomes for the nuclear modification factor R_AA and for the elliptic flow v_2 of D/B mesons, heavy-flavour electrons and non-prompt J/\psi's are displayed.Comment: 16 pages, 21 figure

The Influence Of Consumer Perceptions About Price, Product Quality And Service Quality Towards Purchasing Decisions (at Janji Jiwa Bengkalis)

This study aims to determine the relationship and influence of price variables, product quality, service quality on purchasing decisions at the Janji Jiwa cafe in Bengkalis partially and simultaneously, to determine the magnitude of the influence of the price variable, product quality, and service quality on purchasing decisions. This type of research is associative. From the test results using partial and simultaneous tests that the variable price, product quality and service quality have a relationship and influence on purchasing decisions. The test results of the coefficient of determination variable price, product quality and service quality affect purchasing decisions with a value of price (22.8%), product quality (44.5%) and service quality (36.7%). This shows that the influence of price, product quality and service quality variables affect purchasing decisions by 60.8%. While the remaining 39.2% (100% - 60.8%) is explained by other causes

Measurement of the Λ hyperon lifetime

A new, more precise measurement of the Lambda hyperon lifetime is performed using a large data sample of Pb-Pb collisions at root s(NN) = 5.02 TeV with ALICE. The Lambda and (Lambda)_bar hyperons are reconstructed at midrapidity using their two-body weak decay channel Lambda -> p + pi(-) and (Lambda)_bar -> (p )_bar + pi(+). The measured value of the Lambda lifetime is tau(Lambda) = [261.07 +/- 0.37(stat.) +/- 0.72o(syst)] ps. The relative difference between the lifetime of Lambda and (Lambda)_bar, which represents an important test of CPT invariance in the strangeness sector, is also measured. The obtained value (tau(Lambda) - tau((Lambda)_bar))/tau(Lambda) = (0.0013 +/- 0.0028(stat.) +/- 0.0021(syst.) is consistent with zero within the uncertainties. Both measurements of the. hyperon lifetime and of the relative difference between tau(Lambda) and tau((Lambda)_bar) are in agreement with the corresponding world averages of the Particle Data Group and about a factor of three more precise

LATE FROST EVENTS IN AN ALPINE VALLEY: MEASUREMENTS AND CHARACTERISATION OF THE PROCESS

Under the research project GEPRI, aimed at investigating and characterizing late frost events potentiallydangerous for cultivated areas, in the spring of 2004 an intensive meteorological field experiment has been made in the Adige River Valley in Trentino (Northern Italy). The project is aimed at a better characterization of the mechanism of late frost events in complex topography in order to improve the forecast of the occurrence of nocturnal temperature minima. In this work some preliminary results of the micrometeorological measurements performed at a target area within an appletrees orchard are presented and discussed. Measurements allowed the determination of the complete energy balance, as well as the identification of specific local-scale circulations which appear to be relevant in characterizing the night-time cooling process. In case of fair weather conditions, the latter displays a sequence of at least four different phases which seem to alternate rather than superimpose advective- and radiative-effects

Operations and Performance of the Silicon Drift and Silicon Strip Detectors of the ALICE experiment.

The calibration and performance of the Silicon Drift and Silicon Strip Detectors of the ALICE experiment is presented. In particular the monitoring of the noise, bad channels and drift velocity, the monitoring and quality assurance, along with the charge calibration with cosmic muons and pp collisions are shown

Mechanistic aspects of the linear stabilization of non-stationary electrochemical oscillations

The problem of non-stationarity in experimentally recorded time-series is common in many (electro)chemical systems. Underlying this non-stationarity is the slow drift in some uncontrollable parameter, and it occurs in spite of the fact that all controllable parameters are kept constant. Particularly for electrochemical systems, some of us have recently suggested [J. Phys. Chem. C, 144, (2010), 22262–22268] an empirical method to stabilize experimental time-series. The method was exemplified for the electro-oxidation of methanol and different patterns were satisfactorily stabilized. In this paper we further elaborate some mechanistic aspects of this method and test it for the electro-oxidation of formaldehyde, a system that has some resemblance with the electro-oxidation of methanol, but produces a richer dynamics. In terms of the reaction mechanism, we were able to describe the coupling and to separate the surface processes of the two sub-systems: the fast one (or the core-oscillator) and the slow one, responsible for the drift

Towards the understanding of the interfacial pH scale at Pt(1 1 1) electrodes

The determination of the potentials of zero total and free charge, pztc and pzfc respectively, were made in a wide pH range by using the CO displacement method and the same calculation assumptions used previously for Pt(1 1 1) electrodes in contact with non-specifically adsorbing anions. Calculation of the pzfc involves, in occasions, long extrapolations that lead us to the introduction of the concept of potential of zero extrapolated charge (pzec). It was observed that the pztc changes with pH but the pzec is independent of this parameter. It was observed that the pztc > pzec at pH > 3.4 but the opposite is true for pH > 3.4. At the latter pH both pzec and pztc coincide. This defines two different pH regions and means that adsorbed hydrogen has to be corrected in the “acidic” solutions at the pztc while adsorbed OH is the species to be corrected in the “alkaline” range. The comparison of the overall picture suggests that neutral conditions at the interface are attained at significantly acidic solutions than those at the bulk.Support from MINECO (Spain) through project CTQ2013-44083-P is greatly acknowledged. E.S. also thanks CNPq (Brazil) for the scholarship (grant No. 200939/2012-2)

Hubungan Fungsi Keluarga Dengan Pemilihan Alat Kontrasepsi IUD Dan Non IUD Pada Akseptor KB

Background: The public comprehension that Family Planning (KB) is only women’s problem, it indicated less healthy family functioning. Syringe contraceptives is more public interest than IUD (Intra Uterine Device) which have high effectiveness. Selection of contraception is a health’s problem that can be influenced by family function. Purpose: The purpose of this research is analyze relationship of family function with selection of contraceptives IUD and Non IUD to the acceptor KB. Method: This research is an analytic observational with cross sectional approachment. It was performed on acceptor KB at Maternity Hospitals and Pusdiklat Migas Cepu Clinic on January 5th-31th 2015. The amount sample was used in 49 samples with simple random sampling. The data was collected by questionnaire and medical record. Data analysis was using with chi-square. Result: The respondents who have healthy family function chose IUD in 10 respondents (20,41%) and Non IUD’s 16 respondents (32,65%), less healthy family function chose IUD in 10 respondents (20,41%) and Non IUD’s 16 respondents (12,24%), unhealthy family function chose IUD in 6 respondents (12,24%) and Non IUD’s 6 respondents (12,24%). Result of statistic chi-square = 8.597 and p value= 0.014. Conclusion: There is a relationship of family function with selection of contraceptives IUD and Non IUD to the acceptor K