Miracle-dz/UniFAR-FTUs huggingface dataset:
Delay Estimation in Presence of Dense Multipath

Exploiting single-shot channel measurements for estimating radio frequency channel parameters remains an active research topic. In presence of dense multipath, it is challenging to estimate accurately parameters of multipath components (MPCs). While standard methods identify MPCs with high energy, we propose to estimate MPCs which are uncorrupted by interfering dense multipath. Based on real and synthetic data, our evaluations demonstrate the potential performance gain with respect to standard methods. The results are compared to the Cramér–Rao bound showing the efficiency of the proposed method.
ANALYSIS OF STUDENTS’ COMMUNICATION STRATEGIES IN ESP CLASS OF MATHEMATIC STUDY PROGRAM

This study examines communication strategies mostly appeared during the learning process at an ESP class, the code switch occurred during the presentation, and the meaning of the code switch that the students used. This research was non experimental descriptive study. Samples in this study were 20 fresh college learners of mathematic study program in a class at University of Lampung. The results show that of the 12 Communications Strategies (CSs) available, the students used 9 CSs. The researcher divided CSs that is used by the students into 4 levels, High frequency strategies (code switching (36,28%), time-gaining strategies (30,37%), and appeal for help (16,03%)), Mid frequency strategies (non-linguistic signal (6,32%) and literal translation (4,64%)), low frequency strategies (message abandonment (2,53%), topic avoidance (2,11%), circumlocution (0,84%), and approximation (0,84%)), non existence strategies (use of all purpose words, word coinage, and foreignizing).
Correlation and Path Coefficient Analysis for Seed Yield and Yield Components in Chickpea under Rainfed Condition

Chickpea is rich in protein and micronutrients and plays a significant role in human diet especially as accompaniment to staples, but seed yields in Kurdistan are still below the crop potential. This investigation was conducted during the spring seasons of 2017, at Bakrajo Research Station, College of Agricultural Sciences/University of Sulaimani to determine relationships among yield and some yield components using correlation and path coefficient analysis in chickpea grown under rainfed conditions. The character seed yield showed positive and highly significant correlation with most characters including plant height, number of branches per plant, deep of roots, number of pods per plant, number of seeds per pod, 100 seed weight, dry mater weight, pod weight per plant, protein percentage and biological weight. Characters dry matter weight per plant recorded the highest positive direct effect on seed yield reached 0.848, while the maximum positive indirect effect on seed yield recorded by weight of pods per plant via dry matter weight per plant with 0.795.
How High is High? A Meta-Analysis of NASA-TLX Global Workload Scores

This paper presents a descriptive analysis of over 1000 global NASA Task Load Index (TLX; Hart & Staveland, 1988) scores from over 200 publications. This analysis is similar to that which was suggested by Hart (2006). The frequency distributions and measures of central tendency presented will aid practitioners in understanding global NASA-TLX scores observed in system tests.
Late complications following tetralogy of Fallot repair: the need for long-term follow-up.

INTRODUCTION We report a series of operated tetralogy of Fallot (TOF) patients focusing on complications and outcomes. MATERIALS AND METHODS Data from TOF patients seen at our centre's adult congenital heart disease clinic was analysed. RESULTS There were 21 patients: the mean age was 32.2 +/- 12.4 years; the age at first operation was 9.0 +/- 7.9 years; the mean postoperative follow-up duration was 23.5 +/- 12.1 years; and the current New York Heart Association (NYHA) status: I, 82%; II, 4%; III, 14%. Fourteen patients had complete operative notes. All these patients underwent total TOF correction; 2 had staged aortopulmonary shunt with total correction at a mean of 3.2 years later, pulmonary artery patch augmentation in 8 patients and pulmonary valvotomy in 8 patients. Three patients required pulmonary valve homograft replacement for severe pulmonary regurgitation (PR) at 13, 28 and 36 years after the initial corrective operation. CURRENT INVESTIGATIONS RBBB on ECG (91%), QRS duration 137 +/- 29 ms. Echocardiography showed dilated right ventricular end-diastolic (RVED) diameters (3.2 +/- 0.8 cm); severe PR (67%), residual right ventricular outflow tract obstruction (RVOTO) (42%) and VSD patch leakage (9%). Cardiac magnetic resonance (CMR) (8 patients) showed dilated RVED volumes 252.6 +/- 93.8 mL, indexed RV volume 165.7 +/- 34.8 mL; RV systolic function was preserved in most patients with a RV ejection fraction of 49.5 +/- 5.7%. One patient had atrial tachycardia and another had frequent non-sustained ventricular tachycardia that required radiofrequency ablation. CONCLUSION Patients with TOF who had full corrective surgery during childhood are now surviving into adulthood. Many challenges arising from complications in the postoperative period remain. It is imperative that adult TOF patients should have regular followup to monitor development and subsequent management of these complications.
Evaluation of Cumulus and Microphysics Parameterizations in WRF across the Convective Gray Zone

This study evaluates the grid-length dependency of the Weather Research and Forecasting (WRF) Model precipitation performance for two cases in the Southern Great Plains of the United States. The aim is to investigate the ability of different cumulus and microphysics parameterization schemes to represent precipitation processes throughout the transition between parameterized and resolved convective scales (e.g., the gray zone). The cases include the following: 1) a mesoscale convective system causing intense local precipitation, and 2) a frontal passage with light but continuous rainfall. The choice of cumulus parameterization appears to be a crucial differentiator in convective development and resulting precipitation patterns in the WRF simulations. Different microphysics schemes produce very similar outcomes, yet some of the more sophisticated schemes have substantially longer run times. This suggests that this additional computational expense does not necessarily provide meaningful forecast improvements, and those looking to run such schemes should perform their own evaluation to determine if this expense is warranted for their application. The best performing cumulus scheme overall for the two cases studies here was the scale-aware Grell–Freitas cumulus scheme. It was able to reproduce a smooth transition from subgrid- (cumulus) to resolved-scale (microphysics) precipitation with increasing resolution. It also produced the smallest errors for the convective event, outperforming the other cumulus schemes in predicting the timing and intensity of the precipitation.
Characterization of Riemannian metrics on \(T^{2}\) with and without positive topological entropy

In der vorliegenden Arbeit wird das Verhalten von Geodatischen auf einem zwei-dimensionalen Torus mit einer Riemannschen Metrik untersucht. Anhand von Eigenschaften von Geodatischen wird zwischen geodatischen Flussen mit positiver und verschwindender topologischer Entropie unterschieden. Die topologische Entropie ist hierbei ein Mas fur die Komplexitat des geodatischen Flusses. Es werden sowohl notwendige als auch hinreichende Kriterien fur verschwindende topologische Entropie des geodatischen Flusses in Abhangigkeit vom Verhalten der Geodatischen entwickelt.
Photospheric and coronal abundances in solar-type stars: the peculiar case of τ Bootis

Aims. Chemical abundances in solar-type stars are still a much debated topic in many respects. In particular, planet-hosting stars are known to be metal-rich, but whether or not this peculiarity applies also to the chemical composition of the outer stellar atmospheres is still to be clarified. More in general, coronal and photosp heric abundances in late-type stars appear to be different in many cases, but understanding how chemical stratification e ffects work in stellar atmospheres requires an observational base larger than currently available. Methods. We obtained XMM-Newton high-resolution X-ray spectra ofBootis, a well known nearby star with a Jovian-mass close-in planet. We analyzed these data with the aim to perform a detailed line-based emission measure analysis and derive the abundances of individual elements in the corona with two different methods applied independently. We have compared the coronal abundances of � Bootis with published photospheric abundances based on high-resolution optical spectra and with those of other late-t ype stars with different magnetic activity levels, including the Sun. Results. We find that the two methods provide consistent results withi n the statistical uncertainties for both the emission measu re distribution of the hot plasma and for the coronal abundances, with discrepancies at the 2�level limited to the amount of plasma at temperatures of 3-4 MK and to the O and Ni abundances. In both cases, the elements for which both coronal and photospheric measurements are available (C, N, O, Si, Fe, and Ni) result systematically less abundant in the corona by a factor 3 or more, with the exception of the coronal Ni abundance which is similar to the photospheric value. Comparison with other late-type stars of similar activity level shows that these coronal/photospheric abundance ratios are peculiar toBootis and possibly related to the characteristic over-metallicity of this planet-hosting star.
The old Nuclear Star Cluster in the Milky Way

We derive new constraints on the mass, rotation, orbit structure and statistical parallax of the Galactic old nuclear star cluster (NSC) and the mass of the supermassive black hole. We combine star counts and kinematic data from Fritz et al (2014), including 2'500 line-of-sight velocities and 10'000 proper motions. We show that the difference between the proper motion dispersions sigma_l and sigma_b cannot be explained by rotation, but is a consequence of the flattening of the NSC. We fit the surface density distribution of stars in the central 1000" by a spheroidal cluster with scale ~100" and a much larger nuclear disk component. We compute the two-integral distribution function f(E,Lz) for this density model, and add rotation self-consistently. We find that: (i) The orbit structure of the f(E,Lz) gives an excellent match to the observed velocity dispersion profiles as well as the proper motion and line-of-sight velocity histograms, including the double-peak in the v_l-histograms. (ii) This requires an axial ratio of q= 0.73+-0.04 for r<70" consistent with our determination from star counts. (iii) The NSC is approximately described by an isotropic rotator model. (iv) Using the corresponding Jeans equations to fit the proper motion and line-of-sight velocity dispersions, we obtain best estimates for the NSC mass, black hole mass, and distance M*(r<100")=(8.94+-0.31|stat+-0.9|syst)x10^6Msun, Mbh=(3.86+-0.14|stat+-0.4|syst)x10^6Msun, and R0=8.27+-0.09|stat+-0.1|syst kpc, where the systematic errors estimate additional uncertainties in the dynamical modeling. (v) The combination of the cluster dynamics with the S-star orbits around Sgr A* strongly reduces the degeneracy between black hole mass and Galactic centre distance present in previous S-star studies. A joint statistical analysis with the results of Gillessen et al (2009) gives Mbh=(4.23+-0.14)x10^6Msun and R0=8.33+-0.11kpc.
Semilinear Schr\"odinger Flows on Hyperbolic Spaces: Scattering in H^1

We prove global well-posedness and scattering in $H^1$ for the defocusing nonlinear Schr\"{o}dinger equations \begin{equation*} \begin{cases} &(i\partial_t+\Delta_\g)u=u|u|^{2\sigma}; u for comparison, on Euclidean spaces scattering in $H^1$ is not known for any exponent $\sigma\in(1/d,2/d]$ and is known to fail for $\sigma\in(0,1/d]$. Our main ingredients are certain noneuclidean global in time Strichartz estimates and noneuclidean Morawetz inequalities.
Urban Extent Extraction Combining Sentinel Data in the Optical and Microwave Range

This paper illustrates a fusion approach to jointly exploit Sentinel-1 (S1) and Sentinel-2 (S2) data to detect urban areas. The proposed procedure is designed to automatically and effectively exploit the specific characteristics of synthetic aperture radar (SAR) and multispectral data, so that it can be safely applied to different urban environments with satisfying results. To this aim, it starts from two previously developed algorithms for urban extent extraction designed for multispectral or SAR spaceborne data. They are first adapted to use S1 and S2 datasets, and then coupled to a novel procedure that merges the two processing chains with the goal to exploit the spectral properties of man-made materials as well as the double bounce backscatter effect that is common in built-up environments. Experimental results in urban areas all around the world show that the proposed approach is successful at combining S1 and S2 information by reducing the errors of the two original techniques.
Phraseology effects as a trigger for errors in L2 English: The case of more advanced learners

When language learners produce “simple” errors (e.g. omission of 3rd person - s ) on forms where their performance is predominantly target-like, are these errors random instances of backsliding, or is there some pattern to the contexts in which they appear? This chapter looks at four such errors – omission of 3rd person - s , inappropriate adverb placement, pluralized adjectives, and plural use of mass nouns – taken from two corpora of written productions by university level learners of English. The occurrence of these errors, even in careful written production, is facilitated by certain phraseological effects. Three types of effect are described – “blending”, where items used together share or transfer their features, “bonding” when collocational links override the requirements of syntax, and “burying”, where elements which are embedded inside larger units become less salient, and so lose grammatical features that they would normally be expected to carry. It is argued that persistent errors do not surface at random, but are triggered by the context.
Using Mobile Phones and PDAs in Ad Hoc Audience Response Systems

This chapter investigates how to create ad hoc audience response systems using nonspecialist devices. The chapter revolves around two case studies: one involving the use of mobile phones, and the other based on PDAs. Both case studies are carried out in tertiary education institutions, showing how these devices can be used to facilitate audience participation using devices that students might, themselves, bring to lectures. Both are evaluated from the perspective of the student and the educator, using a mixture of observational and interview-based techniques. IntroductIon
Existence And Regularity Of Solutions To Nonlinear Elliptic Equations Without Sign Condition

In this paper we study the existence of bounded weak solutions for some nonlinear Dirichlet problems in a bounded domains. Without any sign condition on the term which growth quadratically on the gradient and for a given function f in L m(â¦) with m > N/2, we prove the existence of bounded weak solutions via L∞-estimates. Our methods relay on Schauder fixed point theorem, a priori estimates and Stampacchia’s L∞-regularity.
THE ARECIBO DETECTION OF THE COOLEST RADIO-FLARING BROWN DWARF

Radio detection provides unique means to measure and study magnetic fields of the coolest brown dwarfs. Previous radio surveys have observed quiescent and flaring emission from brown dwarfs down to spectral type L3.5, but only upper limits have been established for even cooler objects. We report the detection of sporadic, circularly polarized flares from the T6.5 dwarf, 2MASS J1047+21, with the Arecibo radio telescope at 4.75 GHz. This is by far the coolest brown dwarf yet detected at radio frequencies. The fact that such an object is capable of generating observable, coherent radio emission, despite its very low, ∼900 K temperature, demonstrates the feasibility of studies of brown dwarfs of the meagerly explored L, T, and Y spectral types, using radio detection as a tool.
Mixing of a passive scalar by the instability of a differentially rotating axial pinch

The mixing of a passive scalar like lithium, beryllium or temperature fluctuations due to the magnetic Tayler instability of a rotating axial pinch is considered. Our study is carried out within a Taylor-Couette setup for two rotation laws: quasi-Kepler and solid-body rotation. The minimum magnetic Prandtl number used is 0.05 while the molecular Schmidt number Sc of the fluid varies between 0.1 and 2. An effective diffusivity coefficient for the mixing is numerically measured by the decay process of a global concentration peak located between the cylinder walls. We find that only models with Sc>0.1 do provide finite eddy diffusivity values. We also find that for quasi-Kepler rotation at a magnetic Mach number Mm~2 the flow transits from the slow-rotation regime to the fast-rotation regime. For fixed Reynolds number the relation between the normalized eddy diffusivity and the Schmidt number of the fluid is always linear so that also a linear relation between the instability-induced diffusivity and the molecular viscosity results just in the sense proposed by Schatzman (1977). The numerical value of the coefficient in this relation will reach a maximum at Mm~2 and will decrease for Mm>>1 implying that only toroidal magnetic fields of order kG can exist in the solar tachocline.
Multiplicity and ellipticity of closed characteristics on compact star-shaped hypersurfaces in ${\bf R}^{2n}$

In this paper, we firstly generalize some theories developed by I. Ekeland and H. Hofer in [EkH] for closed characteristics on compact convex hypersurfaces in ${\bf R}^{2n}$ to star-shaped hypersurfaces. As applications, we use Ekeland-Hofer theory and index iteration theory to prove that if a compact star-shaped hypersuface in ${\bf R}^4$ satisfying some suitable pinching condition carries exactly two geometrically distinct closed characteristics, then both of them must be elliptic. We also conclude that the theory developed by Y. Long and C. Zhu in [LoZ] still holds for dynamically convex star-shaped hypersurfaces, and combining it with the results in [WHL], [LLW], [Wan3], we obtain that there exist at least $n$ closed characteristics on every dynamically convex star-shaped hypersurface in ${\bf R}^{2n}$ for $n=3, 4$.
The International Large Detector: Letter of Intent

The International Large Detector (ILD) is a concept for a detector at the International Linear Collider, ILC. The ILC will collide electrons and positrons at energies of initially 500 GeV, upgradeable to 1 TeV. The ILC has an ambitious physics program, which will extend and complement that of the Large Hadron Collider (LHC). A hallmark of physics at the ILC is precision. The clean initial state and the comparatively benign environment of a lepton collider are ideally suited to high precision measurements. To take full advantage of the physics potential of ILC places great demands on the detector performance. The design of ILD is driven by these requirements. Excellent calorimetry and tracking are combined to obtain the best possible overall event reconstruction, including the capability to reconstruct individual particles within jets for particle ow calorimetry. This requires excellent spatial resolution for all detector systems. A highly granular calorimeter system is combined with a central tracker which stresses redundancy and efficiency. In addition, efficient reconstruction of secondary vertices and excellent momentum resolution for charged particles are essential for an ILC detector. The interaction region of the ILC is designed to host two detectors, which can be moved into the beam position with a push-pull scheme. The mechanical design of ILD and the overall integration of subdetectors takes these operational conditions into account.
Structural correlations in $Cs_2CuCl_4$: Pressure dependence of electronic structures

We have investigated the crystal structure of $Cs_2CuCl_4$ in the 0-20 GPa range as a function of pressure and how pressure affects its electronic properties by means of optical absorption spectroscopy. In particular, we focused on the electronic properties in the low-pressure Pnma phase, which are mainly related to the tetrahedral $CuCl_4^{2-}$ units distorted by the Jahn-Teller effect. This study provides a complete characterization of the electronic structure of $Cs_2CuCl_4$ in the Pmna phase as a function of the cell volume and the $Cu-Cl$ bond length, $R_{Cu-Cl}$. Interestingly, the opposite shift of the charge-transfer band-gap and the $Cu^{2+}$ d-d crystal-field band shift with pressure are responsible for the strong piezochromism of $Cs_2CuCl_4$. We have also explored the high-pressure structure of $Cs_2CuCl_4$ above 4.9 GPa yielding structural transformations that are probably associated with a change of coordination around $Cu^{2+}$. Since the high-pressure phase appears largely amorphized, any structural information from X-ray diffraction is ruled out. We use electronic probes to get structural information of the high-pressure phase. Edited by: A. Goñi, A. Cantarero, J. S. Reparaz
Characteristics of Tornado Events and Warnings in the Southeastern United States

The southeastern United States has become a prime area of focus in tornado-related literature due, in part, to the abundance of tornadoes occurring in high-shear low-CAPE (HSLC) environments. Through this analysis of 4133 tornado events and 16 429 tornado warnings in the southeastern United States, we find that tornadoes in the Southeast do indeed have, on average, higher shear and lower CAPE than tornadoes elsewhere in the contiguous United States (CONUS). We also examine tornado warning skill in the form of probability of detection (POD; percent of tornadoes receiving warning prior to tornado occurrence) and false alarm ratio (FAR; percent of tornado warnings for which no corresponding tornado is detected), and find that, on average, POD is better and FAR is worse for tornadoes in the Southeast than for the CONUS as a whole. These measures of warning skill remain consistent even when we consider only HSLC tornadoes. The Southeast also has nearly double the CONUS percentage of deadly tornadoes, with the highest percentage of these deadly tornadoes occurring during the spring, the winter, and around local sunset. On average, however, the tornadoes with the lowest POD also tend to be those that are weakest and least likely to be deadly; for the most part, the most dangerous storms are indeed being successfully warned.