A Robust Continuous Time Fixed Lag Smoother for Nonlinear Uncertain Systems

This paper presents a robust fixed lag smoother for a class of nonlinear uncertain systems. A unified scheme, which combines a nonlinear robust estimator with a stable fixed lag smoother, is presented to improve the error covariance of the estimation. The robust fixed lag smoother is based on the use of Integral Quadratic Constraints and minimax LQG control. The state estimator uses a copy of the system nonlinearity in the estimator and combines an approximate model of the delayed states to produce a smoothed signal. In order to see the effectiveness of the method, it is applied to a quantum optical phase estimation problem. Results show significant improvement in the error covariance of the estimator using fixed lag smoother in the presence of nonlinear uncertainty.Comment: 8 pages, will be presented in 52nd Conference on Decision and Contro

Exploring the Coverage of Cyberchondria Addiction in Newspapers: A Perspective from the USA

Objectives: The purpose of this study is to investigate how US newspapers reported cyberchondria from 2009 to 2021. Cyberchondria shares similarities with addiction, making it imperative to delve into its representation in media. Cyberchondria refers to an issue of excessive and repetitive internet searches for health information often accompanied by obsessive-compulsive behavior. The goal of this research is locate the frames that appear in cyberchondria coverage, look at how the frames have changed over the given time span, and assess the emotions that the news frames portray. Method: After collecting the relevant news items, the study applies correspondence analysis, sentiment analysis, and cooccurrence network analysis. The NRC word-emotion lexicon is used for sentiment analysis, while the Fruchterman and Reingold algorithm is used for co-occurrence network analysis. Results: The co-occurrence network analysis reveals six frames in cyberchondria coverage. The frames depict themes such as defining cyberchondria, the impact on healthcare providers, health information-seeking behavior, internet diagnosis, and the exaggeration of health concerns. Sentiment analysis reveals that the predominant feeling, which reflects both the positive and negative elements of cyberchondria, is trust, followed by fear. Coding strategies validate the covering themes’ consistency during the years under examination. Correspondence analysis indicates a consistent framing pattern over the years, and we can see an increasing focus on academic studies addressing cyberchondria. Conclusions: The results point to the necessity of ongoing public awareness campaigns, health literacy initiatives, and stakeholder collaboration to effectively address the problems associated with cyberchondria addiction in the digital age. Policymakersand media practitioners can benefit greatly from the study’s insightful contributions in reducing the negative effects of cyberchondria addiction on society

Robust Smoothing for Estimating Optical Phase Varying as a Continuous Resonant Process

Continuous phase estimation is known to be superior in accuracy as compared to static estimation. The estimation process is, however, desired to be made robust to uncertainties in the underlying parameters. Here, homodyne phase estimation of coherent and squeezed states of light, evolving continuously under the influence of a second-order resonant noise process, are made robust to parameter uncertainties using a robust fixed-interval smoother, designed for uncertain systems satisfying a certain integral quadratic constraint. We observe that such a robust smoother provides improved worst-case performance over the optimal smoother and also performs better than a robust filter for the uncertain system.Comment: 6 pages, 7 figures, Proceedings of the 2014 European Control Conference, pp. 896-90

Dependencia de la viscosidad de cizalladura en la concentración depseudo plasticidad (oxido de polietileno - xantano) colisión de polímero

Introduction: Its necessary to bear in mind that we life in theword increase industrialization, therefore we make many modifications to material to getting on best characterizations. The aim ofthis research is to Prepare new Pseudo Plasticity Polymer Collide.Materials and Methods: In the present paper effects of xanthancellulose gum (X) on rheological properties of polyethylene oxidepolymer (PEO, 3000 Daltons) included different type of viscosityhas been investigated by using the following parameters: (Spindle:no.1, Speed: 60 rpm and Temperature: RT), different sort of viscosity is computed for a PEO that dissolved in distilled cold waterwith completely different various concentrations (0.1, 0.2 to 0.8)%g/mL once and before adding (0.25 and 0.5) g X for every concentration. Results and Discussion: The results show that all properties of density, shear viscosity, relative viscosity, specific viscosity,reduced viscosity, intrinsic viscosity, viscosity average mass and theeffective molecular radius have been enhanced after the addition ofxanthan. Conclusions: Addition of xanthan are often applied asthicker mixture in coating, oil drilling and pumping of fluids attributable related pseudo physical propert

High-pressure neutron study of the morphotropic PZT: phase transitions in a two-phase system

In piezoelectric ceramics the changes in the phase stabilities versus stress and temperature in the vicinity of the phase boundary play a central role. The present study was dedicated to the classical piezoelectric, lead-zirconate-titanate (PZT) ceramic with composition Pb(Zr$_{0.54}$Ti$_{0.46}$)O$_3$ at the Zr-rich side of the morphotropic phase boundary at which both intrinsic and extrinsic contributions to piezoelectricity are significant. The pressure-induced changes in this two-phase (rhombohedral $R3c$+monoclinic $Cm$ at room temperature and $R3c+P4mm$ above 1 GPa pressures) system were studied by high-pressure neutron powder diffraction technique. The experiments show that applying pressure favors the $R3c$ phase, whereas the $Cm$ phase transforms continuously to the $P4mm$, which is favored at elevated temperatures due to the competing entropy term. The $Cm\rightarrow R3c$ phase transformation is discontinuous. The transformation contributes to the extrinsic piezoelectricity. An important contribution to the intrinsic piezoelectricity was revealed: a large displacement of the $B$ cations (Zr and Ti) with respect to the oxygen anions is induced by pressure. Above 600 K a phase transition to a cubic phase took place. Balance between the competing terms dictates the curvature of the phase boundary. After high-pressure experiments the amount of rhombohedral phase was larger than initially, suggesting that on the Zr-rich side of the phase boundary the monoclinic phase is metastable.Comment: 6 figure

Application of caputo-fabrizio fractional order derivative (NFDt) in simulating the MHD flow of the third grade non-newtonian fluid in the porous artery

In this paper, the third grade non-Newtonian MHD blood flow in the porous arteries subjected to the periodic pressure gradient was studied using the Caputo-Fabrizio (NFDt ) time fractional order derivative. The time fractional model was solved by taking the Laplace and the finite Hankel transforms. Results were compared with those reported in the previous studies and good agreement was found. The Mathematica software was used to simulate the velocity profile and the Bessel functions with zero order and first order of first kind. The correlations between the flow velocity and the third grade non-Newtonian fluid parameter, the magnetic field and the porosity were negative. Nevertheless, the flow velocity increased with respect to the Womersely number