Miracle-dz/UniFAR-FTUs huggingface dataset:
Compact Cylindrical Pattern-Diversity Dielectric Resonator Antenna

A compact cylindrical pattern-diversity dielectric resonator antenna (DRA) is designed using the HEM11δ and TM01δ modes, which are the fundamental modes of the hybrid electromagnetic (HEM) and TM modes, respectively. To make the two resonance frequencies equal for the diversity operation, a meander-line-loaded annular slot is used to excite the TM01δ mode and to lower its resonance frequency. The annular slot, however, does not significantly affect the HEM11δ mode, which is excited by a pair of differential strips. It is found that impedance match of each port can be tuned independently. To verify the idea, a 2.4 GHz prototype was designed, fabricated, and measured for WLAN applications. Good agreement between the measured and simulated results is observed. The impedance passbands of the two modes have an overlapping bandwidth of 5.7%, with the port isolation higher than 30 dB. The envelope correlation coefficient obtained from the measured field patterns is desirably very low, being less than 0.001. Our design is electrically smallest in volume and lowest in profile among the reported pattern-diversity DRAs.
Strong stabilization of (almost) impedance passive systems by static output feedback

The plant to be stabilized is a system node \begin{document}$ \Sigma $\end{document} with generating triple \begin{document}$ (A,B,C) $\end{document} and transfer function \begin{document}$ {\bf G} $\end{document} , where \begin{document}$ A $\end{document} generates a contraction semigroup on the Hilbert space \begin{document}$ X $\end{document} . The control and observation operators \begin{document}$ B $\end{document} and \begin{document}$ C $\end{document} may be unbounded and they are not assumed to be admissible. The crucial assumption is that there exists a bounded operator \begin{document}$ E $\end{document} such that, if we replace \begin{document}$ {\bf G}(s) $\end{document} by \begin{document}$ {\bf G}(s)+E $\end{document} , the new system \begin{document}$ \Sigma_E $\end{document} becomes impedance passive. An easier case is when \begin{document}$ {\bf G} $\end{document} is already impedance passive and a special case is when \begin{document}$ \Sigma $\end{document} has colocated sensors and actuators. Such systems include many wave, beam and heat equations with sensors and actuators on the boundary. It has been shown for many particular cases that the feedback \begin{document}$ u = - {\kappa} y+v $\end{document} , where \begin{document}$ u $\end{document} is the input of the plant and \begin{document}$ {\kappa}>0 $\end{document} , stabilizes \begin{document}$ \Sigma $\end{document} , strongly or even exponentially. Here, \begin{document}$ y $\end{document} is the output of \begin{document}$ \Sigma $\end{document} and \begin{document}$ v $\end{document} is the new input. Our main result is that if for some \begin{document}$ E\in {\mathcal L}(U) $\end{document} , \begin{document}$ \Sigma_E $\end{document} is impedance passive, and \begin{document}$ \Sigma $\end{document} is approximately observable or approximately controllable in infinite time, then for sufficiently small \begin{document}$ {\kappa} $\end{document} the closed-loop system is weakly stable. If, moreover, \begin{document}$ \sigma(A)\cap i {\mathbb R} $\end{document} is countable, then the closed-loop semigroup and its dual are both strongly stable.
Singularities in fluid mechanics

Singularities of the Navier-Stokes equations occur when some derivative of the velocity field is infinite at any point of a field of flow (or, in an evolving flow, becomes infinite at any point within a finite time). Such singularities can be mathematical (as e.g. in two-dimensional flow near a sharp corner, or the collapse of a Mobius-strip soap film onto a wire boundary) in which case they can be resolved by refining the geometrical description; or they can be physical (as e.g. in the case of cusp singularities at a fluid/fluid interface) in which case resolution of the singularity involves incorporation of additional physical effects; these examples will be briefly reviewed. The finite-time singularity problem for the Navier-Stokes equations will then be discussed and a recently developed analytical approach will be presented; here it will be shown that, even when viscous vortex reconnection is taken into account, there is indeed a physical singularity, in that, at sufficiently high Reynolds number, vorticity can be amplified by an arbitrarily large factor in an extremely small point-neighbourhood within a finite time, and this behaviour is not resolved by viscosity. Similarities with the soap-film-collapse and free-surface--cusping problems are noted in the concluding section, and the implications for turbulence are considered.
Hyper-realism in the Adventures of Tintin

The Adventures of Tintin: The Secret of the Unicorn is an animated feature film that blends graphic stylisation with photorealistic surfaces and motion capture to create digital beings in a hyper-realistic style. As a result, the visual style of The Adventures of Tintin is significantly different to the now dominant cartoon stylisation that continues to develop in studios such as Disney, PIXAR and many others. Disney inspired cartoon stylised films, such as Frozen, continue to engage audiences around the world; receiving relatively little criticism for their visual style. Hyper-realistic animation, however, has struggled to achieve the same widespread acceptance. Many people continue to find hyper-realistic characters less engaging than cartoon characters and at times even find them to be somewhat repulsive. Via close analysis of The Adventures of Tintin, this paper illuminates the significance of establishing visual harmony between the elements of shape, surface and motion to sustain appealing and believable hyper-realistic characters.
Convolutional Neural Network for Blind Image Quality Assessment

Blind image quality assessment (BIQA) methods can measure the quality of distorted images even without referencing the original images. This property is indispensable in the image processing ﬁeld because reference images are normally not available in practice. Unlike the existing trained models, in our work, the training process is constructed as an end-to-end learning mechanism that minimizes the loss between the predicted score and the ground-truth score of the human vision system (HVS). Moreover, a convolutional neural network (CNN) takes distorted images as input and outputs the related score for each image. In this paper, we evaluate the proposed method on six publicly available benchmarks and the cross-database validation performance on the LIVE, CSIQ and TID2013 databases. The experimental results show that our proposed method outperforms other state-of-the-art methods.
Sensitivity of fiber‐based modalmetric devices intended for optical detection of acoustic signals

The basic structure of fiber‐based modalmetric devices consists of a single‐mode fiber (SMF) spliced to a sensitive multimode fiber (s‐MMF) strand. The aim of this article, is to show and compare the sensitivity measurement results amongst of distinct implementations of lumped multimode interference fiber‐optic reflecting (R‐MMI) and transmitting (T‐MMI) modalmetric detectors, and a fiber Bragg grating (FBG) device, each one working as uncalibrated detector of ultrasound acoustic‐signals. All experiments were performed at 42.9 kHz carrier frequency and most of them were at 1551.5 nm wavelength. In all cases, the interaction length of the s‐MMF for a single traveling was kept at 50 mm and the fiber ends of R‐MMI samples were not mirrored. The sensitivity was observed to increase when: the modalmetric device was used instead of the FBG; the core diameter of s‐MMF was increased from 50 μm to 62.5 μm; the SMF/s‐MMF connection was angularly misaligned from 0° to 8°; the feeding optical power level was increased; the interaction length of s‐MMF was doubled and the wavelength probe was reduced from 1551.5 nm to 1520 nm. The dependence of the modalmetric devices' transmission with the length of the s‐MMF and wavelength was numerically calculated. It was concluded that modalmetric devices are highly sensitive and can be further improved yet, but have a stochastic nature in their present implementation.
TP regrmen combined with concurrent or sequential radiotherapy for advanced esophageal carcinoma

OBJECTIVE:To observe efficacy and toxicity of TP with concurrent or sequential radiotherapy for stage Ⅱ-Ⅲesophageal carcinoma,and compared efficacy and toxicity between different nationalities.METHODS:Totally 171 patients with advanced esophageal carcinoma who were treated in our hospital from 2006-12-01to 2009-12-31were ran-domly divided into two groups,86of them were treated with concurrent chemoradiotherapy and 85of them in the sequen-tial chemoradiotherapy group were given chemotherapy after 3-4weeks of radiotherapy.All the patients were treated with 3D-CRT or IMRT combined with TP chemotherapy(cisplatin/carboplatin+paclitaxel). RESULTS:The short term effective rates was 73.26%in the concurrent chemoradiotherapy group and 65.88%in the sequential chemoradiotherapy group,and there was no significant difference(χ2=1.089,P=0.295);1,2,3-years survival rates of the two groups were 77.91%,61.18%,65.12%,47.06% and 41.86%,31.76% respectively,and the statistic difference was found between them(χ2=5.098,P=0.024);1,2,3-years survival rates of the Han and the Minority in the two groups were 82.98%, 71.79%,68.09%,61.54%,53.19%,28.21% and 71.11%,50.00%,57.78%,35.00%,42.22%,20.00% respectively, which could be found that the 1,2,3-years survival rates of the Han were higher than the Minority,but the statistic differ-ence can only be found in the sequential chemoradiotherapy group(χ2=8.325,P=0.016);It also could be found that the 1, 2,3-years survival rates of the concurrent chemoradiotherapy group were higher than that of the sequential chemoradiotherapy group in both Han group(χ2=3.549,P=0.049)and the Minority group(χ2=3.955,P=0.039). The main toxicity of the two groups were radiation esophagitis,myelosuppression and gastrointestinal reaction,which were more serious in the con-current chemoradiotherapy group than that in the sequential chemoradiotherapy group,but only in the myelosuppression(χ2=12.74,P=0.013)and gastrointestinal reaction(χ2=10.47,P=0.033)the statistic difference could be found,and all patients were well-tolerated;the rates of all the toxicity were higher in the Han group than that of the Minority group(P0.05). CONCLUSION:TP with concurrent radiotherapy has higher survival rates compared with the sequential che-moradiotherapy for advanced esophageal carcinoma,the efficiency and the toxicity are different in the different Peoples,and the toxicity is tolerable.
AN R PACKAGE FOR MULTIVARIATE HYPOTHESIS TESTS: MVTESTS

In recent years, the R program is widely used for statistical analysis. Because the R program is open source software, it may contain the R packages developed by users. This study aims to promote an R package entitled MVTests, which consists of multivariate hypothesis tests. By using this package, one performs hypothesis tests, which are used widely and related to each other, such as One-Way MANOVA, multivariate normality tests, Box-M test. In this study, the theoretical background of these tests and their applications with MVTests package are given. Users test easily to their data with MVTests package. Therefore, it is believed that this study is a helpful tool for researchers and users.
Particle-in-cell plasma simulation with OmpSs-2

With the increasing numerical power of supercomputing facilities, High Performance Computing (HPC) has become key for scientific research. Consequently, the heterogeneous computer architectures are more complex and present a challenge in order to write efficient and scalable programs. The programming model provided by OmpSs-2 based in annotations in the code to define tasks and dependencies, unleash a new way to develop complex applications hiding the complications away from the programmer. However, it is not until a specific problem is addressed when the limitations and unforeseen difficulties are observed and only then new solutions can be proposed. In this project, a plasma simulator is designed and parallelized using the taskflow model, while the different challenges found are used to propose improvements in the programming model. As a result, a fully functional 2D electrostatic with background magnetic field plasma simulator is designed, based on the particle-incell method. A fast spectral and parallelized solver is included with a real-time visualization software. The scalability is evaluated with various benchmarks and our results suggest that the FFT leads to a bottleneck in the simulation, from which a new proposed method is left to future work.
Odnos inteligencije, jasnoće pojma o sebi i samohendikepiranja u situaciji manipuliranog neuspjeha na testu inteligencije

Self-handicapping is an important area of study because of its frequency and its negative impact on the achievements of people who use it. Its use is particularly noticeable in the academic context, and this is why this research was conducted in school with the main aim to examine relationship between self-handicapping, intelligence and self-concept clarity in the situation when students face failure on the intelligence test. In the study participated a total of 51 second grade students from high school in Zadar. Intelligence was measured twice by A and B form of Test nizova (Pogacnik, 1997). Before second measurement students were given negative feedback which contained information about failure on the first intelligence test. Afterwards they had the opportunity to use claimed and behavioural self-handicapping strategies. Additionaly, we used Academic self-handicapping scale (from PALS, Midgley et al., 2000), Self-concept clarity scale (Campbell et al., 1996) and BIS scale (Carver & White, 1994). Resultes of this research showed differences in the result on the second intelligence test, incremental theory, claimed self-handicapping and self-assesment of intelligence between students who use behavioral self-handicapping strategy highly, moderately and slightly/not use it. On the other side, difference was not found for self-concept clarity, BIS sensitivity, entity theory and academic self-handicapping between those groups. No statistically significant relation has been established between different measures of selfhandicapping. Behavioural self-handicapping is positively correlated with self-assessment of intelligence, result on second intelligence test and incremental theory, while claimed selfhandicapping is correlated with self-concept clarity and BIS sensitivity. Sex, self-assessment of intelligence, implicit theories of intelligence and self-concept clarity have not been found significant predictors of claimed, behavioural and academic selfhandicapping. The only significant predictor of claimed self-handicapping is BIS sensitivity.
Adaptive NN Cooperative Control of Unknown Nonlinear Multiagent Systems With Communication Delays

In this article, we address the distributed adaptive neural network (NN) control problem for approximate state consensus under communication delays. High-order agent models are considered with unknown nonlinearities and unknown, nonidentical control directions. A novel set of variables called proportional and delayed integral (PdI) consensus error variables are introduced that allow us to recast the approximate consensus problem as an approximate regulation problem. Each PdI variable associated with a certain agent uses only delayed measurements of its neighbors’ states in accordance to our delayed communication protocol. Radial basis function (RBF) NNs are employed to approximate the unknown nonlinearities and distributed adaptive NN control laws with Nussbaum gains are proposed that ensure approximate consensus by steering all PdI variables to a neighborhood of zero. Simulation results are also presented that verify the validity of our theoretical analysis.
Gaussian sum pseudolinear Kalman filter for bearings‐only tracking

The efficacy of a bearings-only tracking algorithm, to a great extent, depends on the target-sensor geometry and motion. Although the pseudolinear Kalman filter and its variants have demonstrated comparable performance with the elite non-linear filters, they still suffer from bias problems and the tracking performance is inevitably affected by the relative geometry and motion relationships. In this study, an observability metric based on classical control theory is first presented to characterise the relative relationships between the target and the sensor. Then an efficient bearings-only tracking algorithm called Gaussian sum pseudolinear Kalman filter is developed. It is based on the bias-compensated pseudolinear Kalman filter and is built within a Gaussian sum framework. In the novel algorithm, a splitting and merging procedure will be triggered when a low degree of observability is detected. Simulation results show the significant performance improvement of the proposed algorithm.
Compressed hydrides as metallic hydrogen superconductors

The 2014-2015 prediction, discovery, and confirmation of record high temperature superconductivity above 200K in H$_3$S, followed by the 2018 extension to superconductivity in the 250-280K range in lanthanum hydride, marks a new era in the longstanding quest for room temperature superconductivity: quest achieved, at the cost of supplying 1.5-2 megabars of pressure. Predictions of numerous high temperature superconducting metal hydrides $XH_n$ ($X$=metal) have appeared, but are providing limited understanding of what drives the high transition temperature T$_c$, or what limits T$_c$. We apply an opportunistic atomic decomposition of the coupling function to show, first, that the $X$ atom provides coupling strength as commonly calculated, but is it irrelevant for superconductivity; in fact, it is important for analysis that its contribution is neglected. Five $X$H$_n$ compounds, predicted to have T$_c$ in the 150-300K range, are analyzed consistently for their relevant properties, revealing some aspects that confront conventional wisdom. A phonon frequency -- critical temperature ($\omega_2$-T$_c$) phase diagram is obtained that reveals a common phase instability limiting T$_c$ at the {\it low pressure} range of each compound. The hydrogen scattering strength is identified and found to differ strongly over the hydrides. A quantity directly proportional to T$_c$ in these hydrides is identified.
Numerical prediction of interaction between turbulence structures and vortex cavitation

ABSTRACT A novel numerical method to perform direct numerical simulations (DNS) of turbulent flow was established to predict the characteristics of compressible gas–liquid two-phase flow. A cavitation model was introduced to reproduce the phase change in the cavitation phenomena, and a DNS of wall turbulence of water with cavitation was performed. Vortex cavitation was observed in the wall turbulence. The growing cavity in the core of the vortex changed the vortex intensity. After vortex cavitation finished, the friction coefficient for the cavitating flow became lower than that of non-cavitating flow. The variation tendency of turbulent statistics corresponded to that of experimental measurements. For a small friction coefficient of the cavitating flow, the redistribution term in the streamwise component of the turbulent kinetic energy equation was reduced owing to the vortex cavitation. Consequently, it was proved that the occurrence of vortex cavitation modified the redistribution term, resulting in turbulence modification.
Simulation research of underwater passive direction finding technology

As one of the indispensable technologies for underwater target detecting, underwater acoustic passive detection technology has always been a hot spot in marine system research. A vector sensor can detect underwater targets by combination with the pressure and vibration velocity information; vector sensor array can obtain higher gain than pressure array with the same number hydrophones. Vector sensor can reduce the length of the underwater sensor array and can detect underwater targets in the case of low signal to noise ratio. This is the goal that many researchers strive to solve for many years; therefore, vector sensor passive detection technology has far-reaching scientific research value.Through the verification of the simulation experiment, the azimuth estimation technique and the adaptive frequency estimation technique are feasible. By estimating the azimuth sequence and frequency sequence of the target radiation signal, the relevant information of the target can be obtained, and so it is of great significance in the research of underwater acoustic detection technology.
Dual extended state observer-based backstepping control of electro-hydraulic servo systems with time-varying output constraints

In this paper, a novel nonlinear robust controller ensuring time-varying output constraints for the double-rod hydraulic servo systems in the presence of largely unknown matched and mismatched disturbances is proposed. By employing two extended state observers for each channel of the load dynamics and pressure dynamics of the considered hydraulic system, the large matched and mismatched disturbances are successfully compensated. In addition, a time-varying barrier Lyapunov function (BLF) of asymmetric type has been employed to make sure that the position output is never violated. The resulting controller is synthesized using the backstepping procedure. The stability of the whole closed-loop hydraulic system associated with the dual extended state observer (ESO)-based controller is strictly guaranteed. In theory, the proposed control strategy can not only ensure the output satisfy the preset constrained space, but also enhance the output tracking performance when the system faces various largely unknown disturbances. The effectiveness of the proposed controller has also been demonstrated via comparative simulation results.
Multivalued solutions of hyperbolic Monge-Ampère equations: solvability, integrability, approximation

Solvability in the class of multivalued solutions is investigated for Cauchy problems for hyperbolic Monge-Ampère equations. A characteristic uniformization is constructed on definite solutions of this problem, using which the existence and uniqueness of a maximal solution is established. It is shown that the characteristics in the different families that lie on a maximal solution and converge to a definite boundary point have infinite lengths. In this way a theory of global solvability is developed for the Cauchy problem for hyperbolic Monge-Ampère equations, which is analogous to the corresponding theory for ordinary differential equations. Using the same methods, a stable explicit difference scheme for approximating multivalued solutions can be constructed and a number of problems which are important for applications can be integrated by quadratures. Bibliography: 23 titles.