Miracle-dz/UniFAR-FTUs huggingface dataset:
Activity in the SPB star 53 Piscium

New spectroscopic observations of the star 53 Psc are presented. A correlation technique has been used to derive the radial velocity curves with a high accuracy. Four frequencies have been detected in the radial velocity variations using four frequency analysis algorithms. Three frequencies (1.81, 1.22 and 1.57 cd 1 )a re typical SPB star frequencies, the last one being close to our detection threshold. They are associated to low amplitude velocities, of the order of 1{2 km s 1 . So we classify 53 Psc in the SPBs class in agreement with its position in the HR diagram. Line equivalent width and central depth variations are also observed. Two phenomena appear: rst, a smooth variation, present in all lines with a time scale of 10 days, could be related to the stellar rotation and a magnetic eld. Second, on two consecutive nights, a sudden and important increase (20%) of equivalent widths and central depths of H and He i lines could be due to an outburst similar to the ones present in some Be stars. The variation in the equivalent widths is mainly due to the increase of the central depth of the quoted lines. This suggests the existence of NLTE eects due to a hot low density plasma in the upper layers of the atmosphere of 53 Psc. An additional frequency is pointed out around 0.11 cd 1 . The best interpretation is
A classification of service discovery protocols

Service discovery is an emerging field in the area of ubiquitous computing. There are various techniques and protocols (proposed or/and already implemented) particularly tailored to specific sets of objectives. This paper analyses the current state of the art and presents a taxonomy of service discovery protocols. Along with design issues, the diversity of solutions and open questions are systematically studied
The influence of energy deposition parameters on laser plasma drag reduction

Laser plasma drag reduction is a new method to reduce the wave drag of hypersonic flight. The research of the laser plasma drag reduction performance is an important work. The purpose of this paper is investigating laser plasma drag reduction by numerical simulation to enhance the understanding of the drag reduction mechanism, get the drag reduction performance in different conditions, and provide references for laser plasma drag reduction experiment in the future. Based on summarizing correlative references systematically, through building the model of energy deposition and comparison the simulated results to the empirical formula and computation results to verify the program correctness, the influence of laser energy parameters to laser plasma drag reduction were simulated numerically for optimize the performance. The follow conclusions were got by numerical simulation: The computation program can well simulate the interacting of LSDW(laser supported detonation wave) to the bow shock in front of the blunt body. Results indicate that the blunt body drag could be decreased by injecting laser energy into the incoming hypersonic flow. The correctness of program was verified by compare result to the experiment and computation results. Blunt body drag will be greatly decreased with injected laser power increased, The bigger laser power is injected, the more drag decreases. There’s an energy saturation value for each laser power level, the injecting laser power effectiveness values are never quite high for all laser power level. There is an optimized energy deposition location in upstream flow, this location is right ahead of the blunt body. When the distance from deposition location to the surface of blunt body is 5 times the blunt radius, blunt body drag decreased the most. This paper investigated the parameters which primary influence the performance of drag reduction. The numerical simulation data and obtained results are meaningful for laser plasma drag reduction experiment investigation. Aerodynamic drag, laser plasma, hypersonic, drag reduction, numerical simulation
Energy trapping of thickness-shear vibrations excited by parallel electric field and its application to piezoelectric vibratory gyroscopes

The energy trapping of thickness shear vibrations, which are excited by parallel electric field in a partially polarized piezoelectric ceramic plate, is studied, and the mechanism of energy trapping is theoretically and experimentally clarified. A new piezoelectric vibratory gyroscope with three electrodes using the energy trapping of thickness-shear vibrations is proposed and experimental results are presented. The results show that high reliability vibratory gyroscopes with the ease in mechanical support can be realized because of the energy trapping effect. A detection sensitivity of 2.8 mV/deg/sec is obtained.
The late-type stellar content of NGC 2403

The late-type stellar content of three disk fields in NGC 2403 was examined using Cousins RI and VI CCD photometry. The AGB luminosity function has been constructed separately for the inner and outer fields. In both cases, relatively fewer bright AGB stars are seen in the NGC 2403 fields than in the LMC. The shape of the AGB luminosity function for the innermost field is quite different from that of the LMC, and there is an indication that recent star formation may have occurred. Several red and blue supergiants and H II regions are also identified in the field to support this. The luminosity function for the outer NGC 2403 fields appears more similar to that of the LMC, and a difference in the star-formation rate in the two regions of NGC 2403 is suggested. A narrowband photometric technique has been used to identify carbon and M stars in the innermost field. Several late M stars are identified, but the carbon star identifications are, at best, tentative. 38 refs.
Spectral linear prediction: Properties and applications

Linear prediction (LP) is presented as a spectral modeling technique in which the signal spectrum is modeled by an all-pole spectrum. The method allows for arbitrary spectral shaping in the frequency domain, and for modeling of continuous as well as discrete spectra (such as filter bank spectra). In addition, using the method of selective linear, prediction, all-pole modeling is applied to selected portions of the spectrum, with applications to speech recognition and speech compression. LP is compared with traditional analysis-by-synthesis (AbS) techniques for spectral modeling. It is found that linear prediction offers computational advantages over AbS, as well as better modeling properties if the variations of the signal spectrum from the desired spectral model are large. For relatively smooth spectra and for filter bank spectra, AbS is judged to give better results. Finally, a sub-optimal solution to the problem of all-zero modeling using LP is given.
Existence of Nontrivial Weak Solutions to Quasi-Linear Elliptic Equations with Exponential Growth

In this paper, we study the existence of nontrivial weak solutions to the following quasi-linear elliptic equations −△nu+V(x)|u| u= f (x,u) |x|β , x∈Rn (n>2), where−△nu=−div(|∇u|∇u), 06β<n, V :Rn→R is a continuous function, f (x,u) is continuous in Rn×R and behaves like eαu n n−1 as u →+∞. AMS Subject Classifications: 35J20, 35J60 Chinese Library Classifications: O175
A semiparametric method of multiple imputation

In this paper, we describe how to use multiple imputation semiparametrically to obtain estimates of parameters and their standard errors when some individuals have missing data. The methods given require the investigator to know or be able to estimate the process generating the missing data but requires no full distributional form for the data. The method is especially useful for non‐standard problems, such as estimating the median when data are missing.
A note on the effect of daylight upon the propagation of electromagnetic impulses over long distances

During some long-distance space telegraphy tests carried out towards the end of February last between a transmitting station situated at Poldhu, on the coast of Cornwall, and a receiving station on board the U. S. s. s. “Philadelphia” travelling from Southampton to New York, I had the opportunity of noticing for the first time in my experience, considerable differences in the distances at which it was possible to detect the received oscillations during daylight, as compared with the distances at which the effects could be obtained at night. Before describing the results obtained, it may be useful if I give a brief description of the nature of the apparatus used at the transmitting and receiving stations.
A Fixed-Point Theoretic Solution of the Hamilton-Jacobi Equation and Its Application to Nonlinear H∞ Control

This paper proposes a novel approach to the Hamilton-Jacobi equation (HJE). Through a functional analytic formulation, a stabilizing solution of the HJE is derived from a fixed-point of a nonlinear mapping on a function space. A sufficient condition for the existence of such a fixed-point is derived quantitatively. For computing the fixed-point, a numerical method based on optimization techniques is introduced. Based on these results, the nonlinear H∞ control problem is reconsidered. Simple numerical examples show that the resulting controllers have enough performance and computed solutions can approximate their analytical counterparts almost uniformly in the entire region under consideration.
Spiral electron beam interaction with whistler waves at cyclotron resonances

The interaction of a radially bounded electron beam spiraling in a magnetoplasma with a quasi-monochromatic whistler at the Cherenkov and Doppler-shifted resonance conditions is investigated. For the linear stage of the interaction, the instability growth rate as well as the radial flux of wave energy emitted by the thin spiral beam are calculated. Compared to previous works considering a cylindrical beam or electrostatic lower hybrid waves, the present study gives the possibility to extend the investigation of the whistler-beam interaction to wider ranges of physical parameters, and, in particular, to situations where the beam is injected obliquely with respect to the ambient magnetic field. The main physical process occurring during the dissipative beam-wave interaction—that is, which takes into account the energy leakage out of the bounded beam volume—is the nonlinear self-organization of part of the beam electrons which leads to the formation of dynamically stable bunches that are continuously deceler.
Linear Source in a Circular Tunnel

We study models for propagation in circular tunnels. The excitation is a fundamental electric current source. We produce expressions for the fields in terms of a Fourier transform over the axial variable. We perform an asymptotic analysis of the complex wavenumbers for use as initial estimates in a complex root finder. We then produce the modes in the lossy structure by contour integration techniques. We include numerical results for the field intensity as a function of axial distance for several frequencies and constitutive parameters of interest.We comment in particular concerning the modal content and the specific form of the field both near to and far from the antenna source.
Minimum entropy generation for laminar boundary layer flow over a permeable plate

A two dimensional laminar boundary layer flow over an isothermal permeable flat plate with blowing and suction has been performed as similar solution for the velocity and temperature fields. The governing equations are approximated by a system of non-linear ordinary differential equations which are solved numerically by applying the shooting iteration method along with fourth-order Runge-Kutta integration scheme. The utilisation of the second law of thermodynamics is focused on the entropy generation minimisation for the optimum blowing and suction velocities on the permeable wall for Pr from 10−2 to 102 and Br, from 10−2 to 102 and the blowing/suction velocity, fw, from −1.238 to 5.
Assessing Goodness-of-Fit of Generalized Logit Models Based on Case-Control Data

We consider testing the validity of the generalized logit model with I+1 categories based on case-control data. After reparametrization, the assumed logit model is equivalent to an (I+1)-sample semiparametric model in which the Ilog ratios of two unspecified density functions are linear in data. By identifying this (I+1)-sample semiparametric model, which is of intrinsic interest in general (I+1)-sample problems, with a biased sampling model, we propose a weighted Kolmogorov? Smirnov-type statistic to test the validity of the generalized logit model. We establish some asymptotic results associated with the proposed test statistic. We also propose a bootstrap procedure along with some results on simulation and on analysis of three real data sets.
Extremely low surface brightness galaxies in the Fornax Cluster - Properties, stability, and luminosity fluctuations

Photographic amplification has led to the discovery of additional low surface brightness (LSB) galaxies in the Fornax Cluster; attention is presently given to these LSBs' morphological appearance, dynamical stability, and usefulness as distance indicators via luminosity fluctuations. The sample obtained is combined with a Virgo LSB sample in order to reinvestigate the faint-end slope of the galaxy luminosity function (LF). Crude dynamical arguments involving questions of disk stability and resistance to disruption by the mean tidal field of the cluster yield circumstantial evidence for an M/L ratio higher than that implied by observed blue colors. In combination with the increase in the faint-end slope of the LF, this implies a nonnegligible mass contribution from these objects. 64 refs.
An X-ray survey for pre-main-sequence stars in the Taurus-Auriga and Perseus molecular cloud complexes

Seventy-five fields from the Einstein X-Ray Observatory IPC detector between 3h and 5h right ascension and 15 deg and 35 deg declination are examined to search for X-ray-emitting low-mass pre-main-sequence (PMS) stars. Six such stars were previously found; they appear to be similar to T Tauri stars but without dense circumstellar envelopes or winds. Finding charts are presented for 59 X-ray sources that may be PMS stars. While some are likely to be spurious X-ray sources, chance coincidences with unrelated stars, or non-PMS stellar sources such as RS CVn type binaries, approximately half are probably X-ray-selected PMS stars. 46 references.
Analysis on Error Bounds of Heat Transfer Problems Using the Fast Residual Correction Method

In this article, the concept of improved fast residual correction is proposed to simplify traditional methods for residual correction. As verified by four heat transfer problems, integrating residual correction into nonlinear iterative processes makes it easier and faster to obtain upper and lower approximate solutions in combination with the finite-difference method, and can even define the maximum error bounds of approximate solutions clearly, without more iteration, solutions to nonlinear problems.
The Relative Roles of Lateral Boundaries, Initial Conditions, and Topography in Mesoscale Simulations of Lee Cyclogenesis

Abstract The contributions of boundary factors, which may be considered to be independent of the physics or the dynamics of the mesoscale model, are explored in a consistent approach for a widely investigated Alpine Experiment (AL-PEX) lee cyclogenesis case. The roles of the lateral boundaries and the initial fields in conjunction with that of the topography, as well as their possible nonlinear interactions in various model settings, are calculated with the aid of the recently developed factor separation method. Focus is given to the influences of the extent of the model domain and of the running period prior to the climax of the lee cyclone development during 36 March 1982. It is shown that the initial conditions are dominant in the first 915 h, during which time the topography and lateral boundaries play negative roles because of the adjusting processes. The nonlinear interaction BI between lateral boundaries (B) and the initial conditions (I) was found to be the major contributor to the cyclone deepe.
Estimating the number of classes in multiple populations: A geometric analysis

The authors study estimation of the total number of classes present in multiple overlapping populations. They show that the number of classes is identifiable in a nonparametric mixture model of multivariate Poisson densities. Unusual phenomena occur in both point estimation and confidence inference for the parameter defined as the odds of a class being unidentified in the data. Consequently only one‐sided confidence intervals are available for the number of classes.
Root n Bandwidth Selectors for Kernel Estimation of Density Derivatives

Abstract Based on a random sample of size n from an unknown density f on the real line, the problem of adaptively selecting the bandwidth in kernel estimation of f (k) is investigated, where f (k) denotes the kth derivative of f. The estimates of density derivatives can be used to evaluate modes and inflection points of f and can be applied to the estimation of scores in certain additive models and to the empirical verification of the law of demand in econometrics. For all k, the information bounds for bandwidth selectors are given, and two types of adaptive bandwidth selectors are proposed. A careful analysis of the kernel estimate of the integrated squared bias (ISB) term, contained in a generalization of smoothed cross-validation, indicates that the “sync kernel” is the proper choice for estimating ISB and, consequently, leads to the first type of selector. The second type of selector is based on the plug-in method, which involves expanding ISB up to suitable order and estimating integrated squared den.
Interior-penalty-stabilized Lagrange multiplier methods for the finite-element solution of elliptic interface problems

In this paper we propose a class of jump-stabilized Lagrange multiplier methods for the finite-element solution of multidomain elliptic partial differential equations using piecewise-constant or continuous piecewise-linear approximations of the multipliers. For the purpose of stabilization we use the jumps in derivatives of the multipliers or, for piecewise constants, the jump in the multipliers themselves, across element borders. The ideas are illustrated using Poisson's equation as a model, and the proposed method is shown to be stable and optimally convergent. Numerical experiments demonstrating the theoretical results are also presented.
On an Ar(1) Time Series Model with Marginal Two Parameter Wright Inverse–Gamma Distribution

In the article, we consider the AR(1) time series model when X t has two parameter inverse–gamma distribution IG2(a, b), a ∈ (0, 1/2], b > 0. It will be shown that Laplace transform of two parameter inverse gamma distribution is Krätzel function. Using suitable approximation procedure Laplace transform of IG2(a, b) will be approximated when transformation argument is large. It will be shown that innovation process has continuous distribution. Finally, model's parameters have been estimated.
HYDRODYNAMIC LIMITS FOR A TWO-SPECIES REACTION-DIFFUSION PROCESS

two-species interaction. We prove the process admits hydrodynamic limits, first with a technique based on correlation functions, then with the method of relative entropy plus coupling. 1. Introduction. The interacting particle system we study in this paper was introduced by Durrett and Levin in [81 where they compare four approaches to model a biological phenomenon. The latter, called hawks and doves model, describes two different species living in interaction in the same region. The approaches considered by Levin and Durrett are discrete or infinitesimal, spatial or not spatial: More precisely, they write the model as a patch model (see [12]), as an interacting particle system (see [4]), as a couple of ordinary differential equations and as a couple of partial differential equations. After comparing the resulting behavior for these four models (that they obtain by heuristic methods), they explain how one could derive PDE from the particle system: By rescaling time and space, a discrete particle system would "converge" to the solution of a partial differential equation, called hydrodynamic equation. In this paper, we prove rigorously this assertion. First of all, we give a precise description of the dynamics:
An E∞ splitting of spin bordism

The work determines the E∞ structure of the K(1)-local spin bordism spectrum by giving a multiplicative splitting into E∞ cells. The splitting leads to a cellular decomposition of the ˆ A-map and creates new isomorphisms of Conner-Floyd type. Introduction and statement of results. One of the most important results on spin bordism goes back to Anderson, Brown and Peterson (ABP). They showed that two spin manifolds are spin bordant if and only if all Stiefel-Whitney and KO-characteristic numbers coincide. Moreover, the spin bordism groups can be computed from the additive 2-local splitting MSpin ∼ =
Lidar and Radiometric Observations of Cirrus Clouds

Abstract The technique of using combined lidar (0.694µm) and radiometric (10–12µm) measurements on cirrus clouds was developed in order to determine their infrared emissivity and to examine the experimental relationships between the infrared and lidar data. Detailed measurements of cirrus infrared emissivity and lidar backscatter were made on several cirrus systems at Adelaide in November 1970. The mean zenith emissivity of cirrus was found to be 0.245. Emissivity was only weakly correlated with thickness. The cirrus extinction coefficient, which is proportional to the particle density, was totally uncorrelated with mid-cloud temperature. Various infrared and visible optical quantities were calculated from the experimental data and the relationships between some of these quantities were examined. The lidar backscatter amplitude integrated through the cloud was found to be well correlated with the infrared optical thickness. A simple model of absorption and scattering of radiation in a cloud of large (σ50µ.
A hybrid algorithm with GA and DAEM

Although the expectation-maximization (EM) algorithm has been widely used for finding maximum likelihood estimation of parameters in probabilistic models, it has the problem of trapping by local maxima. To overcome this problem, the deterministic annealing EM (DAEM) algorithm was once proposed and had achieved better performance than EM algorithm, but it is not very effective at avoiding local maxima. In this paper, a solution is proposed by integrating GA and DAEM into one procedure to further improve the solution quality. The population based search of genetic algorithm will produce different solutions and thus can increase the search space of DAEM. Therefore, the proposed algorithm will reach better solution than just using DAEM. The algorithm retains the property of DAEM and gets the better solution by genetic operation. Experiment results on Gaussian mixture model parameter estimation demonstrate that the proposed algorithm can achieve better performance.
The λstructure of the green ring of GL(2, (F p) in characteristic P, III

In this paper the reader is assumed to have taken notice of [I]. In [III] 1 we described the $lambda;, and s-, structure of the Green ring of GL(2,F p), and Sl(2,F p). We shall now construct a subring of the Green ring which is invariant for the $lambda;, and s-, operations. It is generated by all the indecomposables with odd-dimensional composition factors. This sheds another light on the results in the previous sections. We shall also study a certain quotient of the Green ring, which is in fact the Green ring of a certain subgroup of GL(2,F p) consisting of upper triangular matrices. The multiplication and the λ, s-, structure of this quotient Green ring is described. Moreover it is shown how this λ and s-, structure controls the deviation from being a λ, respectively s-, ring of the Green ring of any finite group with a normal Sylow subgroup of order p. The sequence of Adams operations for these groups is shown to be periodic, and the period reflects the internal p-structure of these groups.