A search for heavy pseudoscalar (A) and scalar (H) Higgs bosons decaying into a top quark pair (tt¯) has been performed with 20.3 fb−1 of proton-proton collision data collected by the ATLAS experiment at the Lar...
详细信息
A search for heavy pseudoscalar (A) and scalar (H) Higgs bosons decaying into a top quark pair (tt¯) has been performed with 20.3 fb−1 of proton-proton collision data collected by the ATLAS experiment at the Large Hadron Collider at a center-of-mass energy s=8 TeV. Interference effects between the signal process and standard model tt¯ production, which are expected to distort the signal shape from a single peak to a peak-dip structure, are taken into account. No significant deviation from the standard model prediction is observed in the tt¯ invariant mass spectrum in final states with an electron or muon, large missing transverse momentum, and at least four jets. The results are interpreted within the context of a type-II two-Higgs-doublet model. Exclusion limits on the signal strength are derived as a function of the mass mA/H and the ratio of the vacuum expectation values of the two Higgs fields, tanβ, for mA/H>500 GeV.
Several extensions of the standard model predict associated production of dark-matter particles with a Higgs boson. Such processes are searched for in final states with missing transverse momentum and a Higgs boson de...
详细信息
Several extensions of the standard model predict associated production of dark-matter particles with a Higgs boson. Such processes are searched for in final states with missing transverse momentum and a Higgs boson decaying to a bb¯ pair with the ATLAS detector using 36.1 fb−1 of pp collisions at a center-of-mass energy of 13 TeV at the LHC. The observed data are in agreement with the standard model predictions and limits are placed on the associated production of dark-matter particles and a Higgs boson.
A search for the dimuon decay of the Higgs boson was performed using data corresponding to an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector in pp collisions at s=13 TeV at the Large Hadron Col...
详细信息
A search for the dimuon decay of the Higgs boson was performed using data corresponding to an integrated luminosity of 36.1 fb−1 collected with the ATLAS detector in pp collisions at s=13 TeV at the Large Hadron Collider. No significant excess is observed above the expected background. The observed (expected) upper limit on the cross section times branching ratio is 3.0 (3.1) times the Standard Model prediction at the 95% confidence level for a Higgs boson mass of 125 GeV. When combined with the pp collision data at s=7 TeV and s=8 TeV, the observed (expected) upper limit is 2.8 (2.9) times the Standard Model prediction.
Introduction: Intensive care unit patients are heavily monitored, and a number of clinically relevant parameters are routinely extracted from high resolution signals. In particular, heart rate is derived from interval...
详细信息
Introduction: Intensive care unit patients are heavily monitored, and a number of clinically relevant parameters are routinely extracted from high resolution signals. In particular, heart rate is derived from intervals between pulses in pseudo-periodic signals such as the electrocardiogram (ECG) or arterial blood pressure (ABP) waveforms. However, poor signal quality and high noise levels can unfortunately lead to false localisation of these pulses (or peaks), resulting in incorrect estimates of heart rate. The goal of the 2014 Physionet/CinC Challenge was to encourage the creation of an intelligent system that fused information from different biosignals to create a robust set of peak detections. Methods: First, a set of peak detectors were evaluated on different cardiovascular signals. The detections were then fused using two different approaches: the first one was based on a calculated measures of signal quality for the ECG and ABP signals and the the second fusion technique was based on the regularity of the derived intervals between subsequent detections made on ECG, ABP, Stroke Volume and Photoplethysmogram signals. These techniques were developed using the MGH/MF database and submitted for scoring on the Challenge test-set. Conclusion: The best entries for the two approaches obtained an overall score of 87.88% and 87.66%, respectively, in phase III of the challenge, which provided the highest official score.
Introduction: The electrocardiogram (ECG) allows for interpretation of the electrical activity of the heart. The information which can be derived from the foetal ECG (FECG) goes beyond heart rate and heart rate variab...
详细信息
Introduction: The electrocardiogram (ECG) allows for interpretation of the electrical activity of the heart. The information which can be derived from the foetal ECG (FECG) goes beyond heart rate and heart rate variability. However morphological analysis of the FECG waveform is usually not performed in clinical practice. Methods: A Bayesian Filtering Framework based on an Extended Kalman Filter (EKF) for extracting the FECG from a single abdominal channel is described using a training database of 20, one minute maternal-foetal mixtures and evaluated on 200, one minute mixtures. (Data was generated using the simulator, fecgsyn, used to generate a subset of the signals of the Physionet Challenge 2013.) A single pass of the EKF (EKFS) was performed to cancel out the maternal ECG (MECG) in order to build an average FECG morphology. A dual EKF (EKFD, i.e. where both the MECG and FECG cycle morphology were modelled) was then applied to separate the three sources present in the signal mixture (noise, MECG and FECG). A normalised root mean square error and absolute QT error after EKFS and EKFD were calculated. Results: An SNR improvement of 1.97 dB after EKFS and 14.14 dB after EKFD on the test set were achieved. Median absolute error on QT measurement was 17.0 ms for the EKFS and 4.0 ms for the EKFD. Conclusion: This work is a proof of concept that the EKFD allows accurate beat to beat extraction of the FECG morphology from abdominal recordings.
Two-particle pseudorapidity correlations are measured in sNN=2.76TeVPb+Pb, sNN=5.02TeVp+Pb, and s=13TeVpp collisions at the Large Hadron Collider (LHC), with total integrated luminosities of approximately 7μb−1, 28 n...
详细信息
Two-particle pseudorapidity correlations are measured in sNN=2.76TeVPb+Pb, sNN=5.02TeVp+Pb, and s=13TeVpp collisions at the Large Hadron Collider (LHC), with total integrated luminosities of approximately 7μb−1, 28 nb−1, and 65 nb−1, respectively. The correlation function CN(η1,η2) is measured as a function of event multiplicity using charged particles in the pseudorapidity range |η|<2.4. The correlation function contains a significant short-range component, which is estimated and subtracted. After removal of the short-range component, the shape of the correlation function is described approximately by 1+〈a12〉1/2η1η2 in all collision systems over the full multiplicity range. The values of 〈a12〉1/2 are consistent for the opposite-charge pairs and same-charge pairs, and for the three collision systems at similar multiplicity. The values of 〈a12〉1/2 and the magnitude of the short-range component both follow a power-law dependence on the event multiplicity. The short-range component in p + Pb collisions, after symmetrizing the proton and lead directions, is found to be smaller at a given η than in pp collisions with comparable multiplicity.
In traffic & transportation system analysis the way individuals make choices plays a paramount role as these will affect the general efficiency with which people can *** on the system by means of policy interventi...
详细信息
In traffic & transportation system analysis the way individuals make choices plays a paramount role as these will affect the general efficiency with which people can *** on the system by means of policy intervention affect commuters' perspective impacting on the performance of the network and eventually on the society's *** emergence of system's behaviour,as a result of decisions at individual level,provides the traffic manager with the opportunity to evaluate modifications that have been implemented on the ***,there has been a slow advance in appropriately representing users and their behaviour in all social dimensions of intelligent transportation *** paper discusses on a social-oriented modelling & simulation framework for Artificial Transportation Systems,which accounts for different social dimensions of the system in the assessment and application of policy *** illustrate how a social agent-based model can be a useful tool to test the appropriateness and efficiency of transportation policies.
Previous research has shown that repetitive processes, a class of 2D systems, can be used to design linear model based iterative learning control laws for convergence and transient performance, with supporting experim...
详细信息
The development of Advanced Driver Assistance Systems (ADAS) is rapidly growing. However, most of the ADAS require field test, which is expensive, unpredictable and time consuming. In this paper we propose a multiagen...
详细信息
The development of Advanced Driver Assistance Systems (ADAS) is rapidly growing. However, most of the ADAS require field test, which is expensive, unpredictable and time consuming. In this paper we propose a multiagent-based driving simulator which integrates a human factor analysis suite and enables rapid and low-cost experimentation of mobile-device ADAS. Our architecture uses a microscopic simulator and a serious-game-based driving simulator. The latter allows the user to control a vehicle and change the correspondent simulation state in the microscopic simulator. The driving simulator also connects to an Android device and sends several kinds of data, such as current GPS coordinates or transportation network data. One important feature of this architecture is its suitability to serve as an appropriate means to conduct behaviour elicitation through peer-designed agents, so as to improve modelling of various driving styles accounting for different aspects of preferences and perception abilities, as well as other performance measures related to drivers' interaction with ADAS solutions. The potentials of our approach to aid experiments in human factor analysis are still to be tested, but are undoubtedly huge and encouraging.
暂无评论