Miracle-dz/UniFAR-FTUs huggingface dataset:
Experimental verification of pyragas's chaos control method applied to chua's circuit

We have built an experimental setup to apply Pyragas’s [1992, 1993] control method in order to stabilize unstable periodic orbits (UPO) in Chua’s circuit. We have been able to control low period UPO embedded in the double scroll attractor. However, experimental results show that the control method is useful under some restrictions we will discuss.
A Circular‐Orifice Number Describing Dependency of Primary Pfeifenton Frequency on Differential Pressure, Gas Density, and Orifice Geometry

A nondimensional number (Δp/ρ)12/ft for primary Pfeifentone relating the dependence of differential pressure Δp across orifice to density of gas ρ, thickness t of orifice‐plate terminating pipe, and frequency f of primary Pfeifentone is obtained by dimensional analysis. Correlation of experimental data presented on the basis of this number indicates that it is relatively constant in numerical value over range of variation of the parameters, pipe length, orifice diameter, differential pressure across orifice, and Pfeifenton frequency, studied.
Time‐ and frequency‐domain characteristics of laser‐generated ultrasonic surface waves

The generation of elastic waves by illumination of a free metal surface with a laser pulse was studied to establish a quantitative basis for laser ultrasonics in nondestructive evaluation of surfaces. Experiments were carried out using a Q‐switched Nd:YAG laser for generation and a wideband piezoelectric sensor for detection. A theoretical model for laser generation was developed for the thermoelastic energy regime. This model integrates over point source Green’s functions, suitably spread throughout the illuminated region. Good agreement was found between experiment and theory for characteristics in both time and frequency domains, for surface waves excited in the thermoelastic regime. For a given laser pulse energy, the highest Rayleigh wave peak frequency and bandwidth occurred when the Gaussian laser‐beam half‐width a was reduced just enough to begin surface damage. Once such damage commenced, further spot size reduction slightly lowered the peak frequency. Quantitative agreement with theory was found.
SLAM-share: visual simultaneous localization and mapping for real-time multi-user augmented reality

Augmented reality (AR) devices perform visual simultaneous localization and mapping (SLAM) to map the real world and localize themselves in it, enabling them to render the virtual holograms appropriately. Current multi-user AR platforms fall short in that they only allow asymmetric sharing of this SLAM information, resulting in multiple "secondary" devices viewing holograms placed by a single "primary" device, instead of equal participation. The goal of this work is to enable all AR devices to participate equally, by constructing a common global map to which all AR devices can contribute. However, doing so with low latency and high accuracy is challenging on resource-constrained mobile devices. This work proposes an appropriate partitioning between clients and a server to achieve high-throughput, low latency, multi-user SLAM. In our system, SLAM-Share, the edge server performs the complex SLAM computations so that the client devices need only perform lightweight operations. The server utilizes shared memory and efficient map merging to build and update a global map from different clients. It also exploits the parallelism of GPU processing to achieve high-performance tracking. Evaluations show that SLAM-Share is able to achieve significant tracking speedups (up to 50% reduction compared to alternative approaches), maintain good localization accuracy, and merge and update maps within 200 ms.
Optimizing Hardware Resource Partitioning and Job Allocations on Modern GPUs under Power Caps

CPU-GPU heterogeneous systems are now commonly used in HPC (High-Performance Computing). However, improving the utilization and energy-efficiency of such systems is still one of the most critical issues. As one single program typically cannot fully utilize all resources within a node/chip, co-scheduling (or co-locating) multiple programs with complementary resource requirements is a promising solution. Meanwhile, as power consumption has become the first-class design constraint for HPC systems, such co-scheduling techniques should be well-tailored for power-constrained environments. To this end, the industry recently started supporting hardware-level resource partitioning features on modern GPUs for realizing efficient co-scheduling, which can operate with existing power capping features. For example, NVidia’s MIG (Multi-Instance GPU) partitions one single GPU into multiple instances at the granularity of a GPC (Graphics Processing Cluster). In this paper, we explicitly target the combination of hardware-level GPU partitioning features and power capping for power-constrained HPC systems. We provide a systematic methodology to optimize the combination of chip partitioning, job allocations, as well as power capping based on our scalability/interference modeling while taking a variety of aspects into account, such as compute/memory intensity and utilization in heterogeneous computational resources (e.g., Tensor Cores). The experimental result indicates that our approach is successful in selecting a near optimal combination across multiple different workloads.
Microstructure and magnetic properties of FePt–Al–O granular thin films

We have investigated the microstructures and magnetic properties of L10 ordered FePt granular thin films prepared by ion beam sputtering and subsequent annealing. As-deposited FePt–Al–O films are composed of fine spherical FePt particles of ∼2 nm diameter with disordered face-centered-cubic structure. These particles are embedded in the amorphous aluminum oxide matrix with average spacing of ∼1.3 nm, and the film exhibits superparamagnetism. By annealing above 650 °C, the nanoparticles transform to the L10 ordered phase and the grains are coarsened to ∼20 nm, which results in a high coercivity up to 10 kOe. In the films with a high Al content, most of the particles are isolated by the amorphous aluminum oxide matrix, while the grains are interconnected in the films with a low Al content. The changes in magnetic properties are discussed based on the microstructural observation results.
Short-scale break-up in unsteady interactive layers: local development of normal pressure gradients and vortex wind-up

Following the finite-time collapse of an unsteady interacting boundary layer (step 1), shortened length and time scales are examined here in the near-wall dynamics of transitional-turbulent boundary layers or during dynamic stall. The next two steps are described, in which (step 2) normal pressure gradients come into operation along with a continuing nonlinear critical-layer jump and then (step 3) vortex formation is induced typically. Normal pressure gradients enter in at least two ways, depending on the internal or external flow configuration. This yields for certain internal flows an extended KdV equation with an extra nonlinear integral contribution multiplied by a coefficient which is proportional to the normal rate of change of curvature of the velocity profile locally and whose sign turns out to be crucial. Positive values of the coefficient lead to a further finite-time singularity, while negative values produce a rapid secondary instability phenomenon. Zero values in contrast allow an interplay between solitary waves and wave packets to emerge at large scaled times, this interplay eventually returning the flow to its original, longer, interactive, boundary-layer scales but now coupled with multiple shorter-scale Euler regions. In external or quasi-external flows more generally an extended Benjamin–Ono equation holds instead, leading to a reversal in the roles of positive and negative values of the coefficient. The next step, 3, typically involves the strong wind-up of a local vortex, leading on to explosion or implosion of the vortex. Further discussion is also presented, including the three-dimensional setting, the computational implications, and experimental links.
High‐Energy Trapped Radiation Penetrating the Rings of Saturn

Electrons and protons in the energy ranges 2–25 MeV and >67 MeV, respectively, have been discovered throughout the entire equatorial region inward from the outer edge of the A ring at L=2.3 to the periapsis of the Pioneer trajectory at L ∼1.3. The trapped radiation which populates Saturn's magnetosphere beyond L=2.3 is totally absent in this region. The electron measurements include (1) a differential energy spectrum ∝ E−0.6, (2) an L dependence consistent with L2.8; and (3) an intensity of ∼0.05 el/cm² s sr near L=2 for the energy range 7–17 MeV (a factor of 5 times the interplanetary quiettime flux in this energy range). The proton measurements display an L dependence of L² with a flux level of ∼6 × 10−2 protons/cm² s sr above 67 MeV, just inside the edge of the A ring. The pitch angle distributions of both the electrons and protons are consistent with isotropy in the dipole magnetic field. It is argued from these results that the electrons and protons are trapped and thus penetrate the A-B-C rings. However, from the above experimental evidence it is concluded that this trapped radiation is not remnant radiation from the trapped radiation region beyond L=2.3. We find that these measurements are consistent with a model for splash albedo production of electrons and protons resulting from the bombardment of the atmosphere and/or rings of Saturn by cosmic ray protons with energies above the Stormer cut-off at the magnetic latitudes of production. These secondary particles are then observed as trapped radiation propagating along the appropriate field lines crossing the ring plane. We also show that electron production may occur through π± → µ± → e± decay chain which yields an L dependence of L2.8 for pions. Our measurements and calculations are in reasonable agreement with extrapolations of electron albedo measurements from earth's upper atmosphere to the physical conditions at Saturn. We conclude that the absorption of the magnetospheric trapped radiation by Saturn's A, B, and C rings provides a set of physical conditions not present in other planetary magnetospheres for investigating the splash and reentrant albedo problems which can then be applied in the near-earth space.
Multiwavelength monitoring of the BL Lacertae object PKS 2155-304. 3: Ground-based observations in 1991 November

We present ground-based observations of the BL Lac object PKS 2155-304 during 1991 November. These data were obtained as part of a large international campaign of observations spanning the electro-magnetic spectrum from the radio waves to the X-rays. The data presented here include radio and UBVRI fluxes, as well as optical polarimetry. The U to I data show the same behavior in all bands and that only upper limits to any lag can be deduced from the cross-correlation of the light curves. The spectral slope in the U-I domain remained constant on all epochs but 2. There is no correlation between changes in the spectral slope and large variations in the total or polarized flux. The radio flux variations did not follow the same pattern of variability as the optical and infrared fluxes. The polarized flux varied by a larger factor than the total flux. The variations of the polarized flux are poorly correlated with those of the total flux in the optical (and hence UV domain; see the accompanying paper by Edelson et al.) nor with those of the soft X-rays. We conclude that the variability of PKS 2155-304 in the optical and near-infrared spectral domains are easier to understand in the context of variable geometry or bulk Lorentz factor than of variable electron acceleration and cooling rates.
Liquid Mass Sensing Using Resonating Microplates under Harsh Drop and Spray Conditions

We have performed in situ real time mass sensing of deposited liquid volatile droplets and sprays using plate-like microstructures, with robust and reusable performance attained over harsh conditions and multiple cycles of operation. A home-built electrooptical sensing system in ambient conditions has been used. The bimorph effect on the resonant frequency of altered mass loading, elasticity, and strain had been carefully compared, and the latter were found to be negligible in the presence of nonviscous liquids deposited on top of our microplate devices. In resonant mode, the loaded mass has been estimated from measured resonant frequency shifts and interpreted from a simple, uniformly deposited film model. A minimum submicrogram detectable mass was estimated, suggesting the system’s potential for robust, fast, and reusable sensing capabilities, in the presence of volatile liquids under harsh operation conditions.
Hot and cold gas toward young stellar objects

High-resolution M band spectra are presented for the seven embedded IR sources W3 IRS 5, S140 IRS1, NGC 7538 IRS 1, NGC 7538 IRS 9, GL 2136, LkH-alpha 101, and MWC 349A, and the data are combined with previously published work for W33A and GL 2591. Cold CO is seen toward all nine sources, with temperatures from 11 K to 66 K. Column densities of cold CO are presented. Hot gas is seen toward eight of the nine objects with temperatures from 120 K to 1010 K. New lower limits to the hot gas density are obtained. The hot gas toward GL 2591, GL 2136, W3 IRS 5, and S140 IRS 1 is probably very near the central source and heated via gas-grain collisions. The optical depth in the silicate feature is strongly correlated with the (C-13)O column density, confirming that silicate optical depth is a useful measure of gas column density. The ratio of solid-to-gaseous CO is obtained for seven sources. 43 refs.
Numerical simulations of cellular secondary currents and suspended sediment transport in open-channel flows over smooth-rough bed strips

The flow and transport of suspended sediment in open-channel flows over smooth-rough bed strips were simulated numerically. The flow equations were solved with the aid of the Reynolds stress model. Simulated flow structures are provided and compared with measured data available in the literature. The comparisons indicate that the numerical model successfully predicts the mean flow and turbulence statistics. The sediment distribution of suspended particles in such flows was also simulated. The transport equation for suspended sediment was solved using the eddy diffusivity concept. The computed results show that flows with higher concentration occur over the smooth strips as observed in a river flow during the floods. The eddy diffusivity profile was also obtained and compared with that from an analytical expression reported byWang and Cheng [Advances inWater Resources. 28 (2005) 441–450]
Van Hiele levels and the SOLO taxonomy

A comparison is made between van Hiele levels of development in geometry and the structure of learning outcomes (SOLO) taxonomy. It is hypothesized that if the correspondence between van Hiele levels and SOLO levels is tenable, then the latter may be used as an operational scheme for characterizing a posteriori the learning outcomes in geometrical tasks without going through the process of identifying van Hiele level indicators by empirically deriving them for a multitude of geometrical tasks. This is particularly relevant since the construct validity of the SOLO taxonomy has been established. A logical comparison and an illustrative example reveal a high degree of similarity between the two sets of levels. † This paper was presented to the 13th Annual Conference of the International Group on the Psychology of Mathematics Education (PME), Paris, July 9‐14, 1989.
Electrical switching in Fe∕Cr∕MgO∕Fe magnetic tunnel junctions

Hysteretic resistance switching is observed in epitaxial Fe∕Cr∕MgO∕Fe magnetic tunnel junctions under bias voltage cycling between negative and positive values of about 1V. The junctions switch back and forth between high- and low-resistance states, both of which depend on the device bias history. A linear dependence is found between the magnitude of the tunnel magnetoresistance and the crafted resistance of the junctions. To explain these results, a model is proposed that considers electron transport both by elastic tunneling and by defect-assisted transmission.
Theoretical foundations of coherent bistatic radar polarimetry

An engineering approach has been applied to the theory of radar polarimetry. It offers numerous advantages in analyzing propagation and scattering ofpolarized waves. It is based on introduction of two mutually conjugate 2-dim. complex spaces of the polarization and phase (PP) vectors and on application of the matrix calculus to the transmission equations when using the exactly defined PP bases. The PP vectors of waves and antennas, including their PP basis vectors, are considered as phasors tangent to the polarization sphere. Keywords: radar polanmetry, bistatic scauering, polarization and phase vector, tangential phasor
Acoustic coefficients of P_2O_5-doped silica fiber: acoustic velocity, acoustic attenuation, and thermo-acoustic coefficient

We present measurements and modeling of the effect of P2O5 doping on the acoustic damping and temperature sensitivity coefficients of silica fibers. In particular, the Brillouin gain spectrum of a highly P-doped fiber is measured and investigated at different temperatures. It is found that the acoustic damping coefficient (proportional to the Brillouin spectral width) of phosphorus pentoxide (1.41 × 105 m−1 for bulk P2O5 at 11 GHz) is similar to, but larger than, that of germanium dioxide. Additionally, the acoustic velocity (and thereby the Stokes’ shift) is found to be much less dependent on temperature in P2O5 ( + 0.12 m/s/°C) than in SiO2 ( + 0.56 m/s/°C). Using these coefficients (the thermo-acoustic coefficients), the modeled and unique slopes of the Stokes’-shift-versus-temperature curves for the four observed acoustic modes each lie within 3% of the measured values. Finally, utilizing both the thermo-optic and thermo-acoustic coefficients, a design example is presented where a composition is determined for which the dependence of the Brillouin frequency shift on temperature is minimized. In this example, the calculated temperature sensitivity is less than 5 kHz/°C over the temperature range −100 °C < T < 100 °C for the molar composition 0.54P2O5:0.46SiO2.
Can interface dislocations degrade ferroelectric properties

A thermodynamic analysis has been carried out to investigate the role of dislocations in ferroelectric materials. Due to the coupling of the stress field of the dislocation and the polarization, there is a drastic variation in the polarization near the dislocation. These polarization gradients result in strong depolarizing fields that suppress the polarization in a region that extends over several nanometrers. In epitaxial ferroelectric films, these polarization gradients should result in the formation of dead layers that severely degrade ferroelectric properties. The detrimental effect of such regions will be enhanced in ultrathin ferroelectric thin films, and hence play a critical extrinsic role in size effect studies of ferroelectrics.
Analysis of CCLM model biases in relation to intra-ensemble model variability

We present an analysis of the climatologies and the interannual variations of 2 m temperature and precipitation for ensemble simulations performed with the CCLM for Europe. Special focus is put on the analysis of the intra-ensemble variabilities. CCLM predicts a pronounced cold bias in spring and summer over large parts of Europe north of approximately 40N. In contrast, the model suffers from a distinct warm bias in Northern Europe in winter. Precipitation is clearly overestimated in Europe during all seasons, with the exception of a dry summer bias extending from Italy to the Black Sea. CCLM distinctly overestimates the precipitation variations over most of Europe while temperature variations tend to be underestimated in Northern Europe and overestimated in the Mediterranean. The study shows that temperature and precipitation biases for both the mean and interannual variability are critically dependent on the ensemble member that is selected for the evaluation. It is therefore essential to use ensemble simulations for model validation in order to avoid random model biases for both the mean and interannual variability of temperature and precipitation. The results suggest that the intra-ensemble variability relative to the model bias is higher for interannual variability than for the mean. It can thus be concluded that the model's performance in predicting climate extremes cannot be properly evaluated using only one model simulation. Finally, we also compare several extreme indices (largest number of consecutive frost days, summer days, wet days, and dry days). The study shows that the cold summer bias leads to an underestimation of the largest number of consecutive summer days over major parts of the model domain. The wet model bias in Central and Northern Europe leads to a distinct underestimation of the largest number of consecutive dry days.
Sensory Evaluation of Minimally Processed Parsley (Petroselinum crispum), Dill (Anethum graveolens) and Lovage (Levisticum officinale) Stored at Refrigeration Temperatures

Minimally processed fresh fruit, vegetables and aromatic herbs are a becoming more popular because they satisfy consumersâ€™ need for time and healthy nutrients. But, even applying packaging and refrigeration their shelf life is short. The main quality losses that occur along storage are changes in colour, texture and flavour. In consequence, it is important to establish how these factors affect acceptance and preference of minimally processed fresh plant food. So, the aim of the present paper is to evaluate the effect of storage at refrigeration temperature on some quality characteristics of the most important minimally processed Romanian seasoning herbs. The herbs under study were parsley, dill and lovage. A grid of attributes of fresh herbs was developed. The herbs, sealed in polyethylene bags, were stored at 4Â°C for 12 days. The evaluation of quality characteristics color, texture and flavor, on a scale of 1 to 5 was done in the 1 st, 5 th, 8th and 12day. In order to evaluate the average quality of the herbs, a quality number was used. Starting form herbs scores in the first day, a sensory profile was determined. This was maintained along the storage period. Even though, scores decreased along the storage period, there were no statistically significant differences for any of the parameters under study in the days taken into consideration. Quality number along the storage period do not differ statistically for none of the three herbs. For minimal processed parsley, dill and lovage the maximum shelf-life was estimated to be 23.3 days, 13.7 days and 15.3 days respectively. Â Â Â th