Miracle-dz/UniFAR-FTUs huggingface dataset:
A search for SH(+) toward Zeta Ophiuchi

L'absorption interstellaire dans la raie R11(O) dans la bande A 3 π-X 3 Σ − (0-0) de SH + a ete recherchee en direction de Zeta Ophiuchi afin de tester les modeles recents d'ondes de choc MHD. Les observations sont comparees aux predictions theoriques de Pineau des Forets, Roueff et Flower (1986, Mon. Not. R. astr. Soc., 223) qui ont etabli des modeles de la chimie du soufre dans les chocs MHD
Singularly perturbed zero dynamics of nonlinear systems

Stability properties of zero dynamics are among the crucial input-output properties of both linear and nonlinear systems. Unstable, or nonminimum phase, zero dynamics are a major obstacle to input-output linearization and high-gain designs. An analysis of the effects of regular perturbations in system equations on zero dynamics shows that whenever a perturbation decreases the system's relative degree, it manifests itself as a singular perturbation of zero dynamics. Conditions are given under which the zero dynamics evolve in two time scales characteristic of a standard singular perturbation form that allows a separate analysis of slow and fast parts of the zero dynamics. The slow part is shown to be identical to the zero dynamics of the unperturbed system, while the fast part, represented by the so-called boundary layer system, describes the effects of perturbation. >
On particle-in-cell methods for the Vlasov-Poisson equations

Abstract Particle methods are now commonly used in the numerical simulation of problems arising in Plasma Physics. They consist in replacing the plasma by a “large” set of charged superparticles which obey the usual Physics laws and then in computing the interactions of these superparticles. For a detailed description of the particle methodology in Plasma Physics, we refer to Hockney and Eastvood [11].
Iterative methods for the split feasibility problem in infinite-dimensional Hilbert spaces

The split feasibility problem (SFP) (Censor and Elfving 1994 Numer. Algorithms 8 221–39) is to find a point x* with the property that x* ∊ C and Ax* ∊ Q, where C and Q are the nonempty closed convex subsets of the real Hilbert spaces and , respectively, and A is a bounded linear operator from to . The SFP models inverse problems arising from phase retrieval problems (Censor and Elfving 1994 Numer. Algorithms 8 221–39) and the intensity-modulated radiation therapy (Censor et al 2005 Inverse Problems 21 2071–84). In this paper we discuss iterative methods for solving the SFP in the setting of infinite-dimensional Hilbert spaces. The CQ algorithm of Byrne (2002 Inverse Problems 18 441–53, 2004 Inverse Problems 20 103–20) is indeed a special case of the gradient-projection algorithm in convex minimization and has weak convergence in general in infinite-dimensional setting. We will mainly use fixed point algorithms to study the SFP. A relaxed CQ algorithm is introduced which only involves projections onto half-spaces so that the algorithm is implementable. Both regularization and iterative algorithms are also introduced to find the minimum-norm solution of the SFP.
New results on discrete-time bounded real lemma for singular systems: strict matrix inequality conditions

Some existing bounded real conditions for discrete-time singular systems usually include a semi-definite matrix inequality which can not be solved by standard LMI solvers. In this paper we prove that the semi-definiteness constrain may be removed and the corresponding bounded real lemma can be described by a strict matrix inequality. The results lead to more tractable and reliable computation when applying them to design control systems.
The Riemann problem for a hyperbolic model of two-phase flow in conservative form

This article is to continue the present author's work (International Journal of Computational Fluid Dynamics (2009) 23 (9), 623–641) on studying the structure of solutions of the Riemann problem for a system of three conservation laws governing two-phase flows. While existing solutions are limited and found quite recently for the Baer and Nunziato equations, this article presents the first instance of an exact solution of the Riemann problem for two-phase flow in gas–liquid mixture. To demonstrate the structure of the solution, we use a hyperbolic conservative model with mechanical equilibrium and without velocity equilibrium. The Riemann problem solution for the model equations comprises a set of elementary waves, rarefaction and discontinuous waves of various types. In particular, such a solution treats both the wave structure and the intermediate states of the two-phase gas–liquid mixture. The resulting exact Riemann solver is fully non-linear, direct and complete. On this basis then, we use locally the exact Riemann solver for the two-phase flow in gas–liquid mixture within the framework of finite volume upwind Godunov methods. In order to demonstrate the effectiveness and accuracy of the proposed solver, we consider a series of test problems selected from the open literature and compare the exact and numerical results by using upwind Godunov methods, showing excellent oscillation-free results in two-phase fluid flow problems.
Pseudorandomness of Basic Structures in the Block Cipher KASUMI

The notion of pseudorandomness is the theoretical foundation on which to consider the soundness of a basic structure used in some block ciphers. We examine the pseudorandomness of the block cipher KASUMI, which will be used in the next‐generation cellular phones. First, we prove that the four‐round unbalanced MISTY‐type transformation is pseudorandom in order to illustrate the pseudorandomness of the inside round function FI of KASUMI under an adaptive distinguisher model. Second, we show that the three‐round KASUMI‐like structure is not pseudorandom but the four‐round KASUMI‐like structure is pseudorandom under a non‐adaptive distinguisher model.
Nanosecond-pulse fiber lasers mode-locked with nanotubes

We demonstrate that mode-locking of ytterbium fiber lasers with a carbon nanotube saturable absorber can produce pulses ranging from 20 ps to 2 ns at repetition rates between 21 MHz and 177 kHz, respectively, depending on cavity length. Nonlinear polarization evolution is not responsible for mode-locking. Even in the nanosecond regime, clean single pulses are observed and the pulse train exhibits low jitter. Combined with extremely large chirp, these properties are suited for chirped-pulse amplification systems.
The pulsations of the B5IVe star HD 181231 observed with CoRoT and ground-based spectroscopy

Context. HD 181231 is a B5IVe star, which has been observed with the CoRoT satellite during ∼5 consecutive months and simultaneously from the ground in spectroscopy and spectropolarimetry. Aims. By analysing these data, we aim to detect and characterize as many pulsation frequencies as possible, to search for the presence of beating effects possibly at the origin of the Be phenomenon. Our results will also provide a basis for seismic modelling. Methods. The fundamental parameters of the star are determined from spectral fitting and from the study of the circumstellar emission. The CoRoT photometric data and ground-based spectroscopy are analysed using several Fourier techniques: Clean-ng ,P asper ,a nd Tisaft, as well as a time-frequency technique. A search for a magnetic field is performed by applying the LSD technique to the spectropolarimetric data. Results. We find that HD 181231 is a B5IVe star seen with an inclination of ∼45 degrees. No magnetic field is detected in its photosphere. We detect at least 10 independent significant frequencies of variations among the 54 detected frequencies, interpreted in terms of non-radial pulsation modes and rotation. Two longer-term variations are also detected: one at ∼14 days resulting from a beating effect between the two main frequencies of short-term variations, the other at ∼116 days due either to a beating of frequencies or to a zonal pulsation mode. Conclusions. Our analysis of the CoRoT light curve and ground-based spectroscopic data of HD 181231 has led to the determination of the fundamental and pulsational parameters of the star, including beating effects. This will allow a precise seismic modelling of this star.
Numerical methods for solving a hyperbolic inverse integro-differential problem

We present a numerical approximation to an inverse hyperbolic integro-differential problem arising in geophysics. The problem is considered in a one-dimensional region; its regularization is carried out according to [7]. We use the Legendre collocation methods and the explicit Leap-Frog advancing time scheme for discretization of the spatial and temporal differential operators respectively. Time integrals are approximated by a composite quadrature formula. We present the results of several experiments in order to validate our discretization schemes. In particular, our tests show that the convergence rate of numerical solutions with respect to the regularization parameters agrees with the theoretical estimates obtained for the continuous case. INTRODUCTION In this paper we consider the numerical approximation to a hyperbolic inverse integrodifferential problem arising in geophysics when studying such phenomena as, for instance, wave propagation in viscoelastic materials or electromagnetic waves in dispersive media. The solution of a geophysical problem is a vector function (u, / i ) where the first component u indicates the state of the physical system (displacement field, electric field, temperature, etc.), whereas h represents the set of unknown parameters that characterize the material. In the analysis of inverse problems these parameters, but not the state function u, are usually the main goal of investigation. Since an identification problem is as a rule ill-posed, several regularizing techniques have been introduced to approximate a given inverse problem by a family of well-posed identification problems depending on two small positive parameters ε and δ. It was sho\vn in [7] that under suitable assumptions the regularized solution converges to the exact one when ε and δ tend to zero accordingly. Note that one-dimensional identification problems are by far more thoroughly investigated as compared to multi-dimensional ones, since the latter, even though being more interesting for practical applications in physics, geophysics, and so on, give rise to several analytical difficulties. In the present paper we consider some numerical schemes for approximation to a family of one-dimensional regularized problems. The latter consist of an integro-differen"Universita di Milano, Dipartimento di Matematica F. Enriques, via Saldini 50, 20133 Milano, Italy. E-mail: zampieri@vmimat.mat. unimi.it
Report on key comparison CCAUV.A-K1

This is the final report for key comparison CCAUV.A-K1 on the pressure calibration of laboratory standard microphones in the frequency range from 125 Hz to 8 kHz. Twelve national measurement laboratories took part in the key comparison and the National Physical Laboratory piloted the project. Two travelling standard microphones were circulated to the participants and results in the form of regular calibration certificates were collected throughout the project. The key comparison reference value (KCRV) has been calculated using the unweighted mean value of the results. Deviations from this value are below 0.05 dB at all frequencies. A frequency of 250 Hz has been chosen to illustrate the degrees of equivalence with the KCRV. In all but one case, the degree of equivalence is smaller than the associated uncertainty. Main text. To reach the main text of this paper, click on Final Report. Note that this text is that which appears in Appendix B of the BIPM key comparison database kcdb.bipm. org/. The final report has been peer-reviewed and approved for publication by the CCAUV, according to the provisions of the Mutual Recognition Arrangement (MRA).
Weakly reductive semigroups with atomistic congruence lattices

Abstract The structure of semigroups with atomistic congruence lattices (that is, each congruence is the supremum of the atoms it contains) is studied. For the weakly reductive case the problem of describing the structure of such semigroups is solved up to simple and congruence free semigroups, respectively. As applications, all commutative, finite, completely semisimple semigroups, respectively, with atomistic congruence lattices are described.
Accurate Stock Movement Prediction with Self-supervised Learning from Sparse Noisy Tweets

Given historical stock prices and sparse tweets, how can we accurately predict stock price movement? Many market analysts strive to use a large amount of information for stock price prediction, and Twitter is one of the richest sources of information presenting real-time opinions of people. However, previous works that use tweet data in stock movement prediction have suffered from two limitations. First, the number of tweets is heavily biased towards only a few popular stocks, and most stocks have insufficient evidence for accurate price prediction. Second, many tweets provide noisy information irrelevant of actual price movement, and extracting reliable information from tweets is as challenging as predicting stock prices.In this paper, we propose SLOT (Self-supervised Learning of Tweets for Capturing Multi-level Price Trends), an accurate method for stock movement prediction. SLOT has two main ideas to address the limitations of previous tweet-based models. First, SLOT learns embedding vectors of stocks and tweets in the same semantic space through self-supervised learning. The embeddings allow us to use all available tweets to improve the prediction for even unpopular stocks, addressing the sparsity problem. Second, SLOT learns multi-level relationships between stocks from tweets, rather than using them as direct evidence for prediction, making it robust to the unreliability of tweets. Extensive experiments on real world datasets show that SLOT provides the state-of-the-art accuracy of stock movement prediction.
Adhesion of E. coli to silver- or copper-coated porous clay ceramic surfaces

Porous ceramic water filters (CWFs), produced by sintering a mixture of clay and a combustible material (such as woodchips), are often used in point-of-use water filtration systems that occlude microbes by size exclusion. They are also coated with colloidal silver, which serves as a microbial disinfectant. However, the adhesion of microbes to porous clay surfaces and colloidal silver coated clay surfaces has not been studied. This paper presents the results of atomic force microscopy (AFM) measurements of the adhesion force between Escherichia coli bacteria, colloidal silver, and porous clay-based ceramic surfaces. The adhesion of silver and copper nanoparticles is also studied in control experiments on these alternative disinfectant materials. The adhesive force between the wide range of possible bi-materials was measured using pull-off measurements during force microscopy. These were combined with measurements of AFM tip radii/substrate roughness that were incorporated into adhesion models to obtain the.
Enhanced light outcoupling in a thin film by texturing meshed surfaces

The authors demonstrate a method of texturing a meshed surface on a poly(dimethyl siloxane) (PDMS) film for improving light extraction. This meshed surface is fabricated through a casting process by using a self-organized porous film as a template. Experimental results show that the light outcoupling efficiency increases on the meshed surface of a freestanding PDMS film with large incident angles. The external quantum efficiency of an organic light-emitting diode with the textured PDMS film was also demonstrated to have an enhancement of 46%.
Phase transition‐like behavior of the magnetosphere during substorms

The behavior of substorms as sudden transitions of the magnetosphere is studied using the Bargatze et al. [1985] data set of the solar wind induced electric field vBs and the auroral electrojet index AL. The data set is divided into three subsets representing different levels of activity, and they are studied using the singular spectrum analysis. The points representing the evolution of the magnetosphere in the subspace of the eigenvectors corresponding to the three largest eigenvalues can be approximated by two-dimensional manifolds with a relative deviation of 10–20%. For the first two subsets corresponding to small and medium activity levels the manifolds have a pleated structure typical of the cusp catastrophe. The dynamics of the magnetosphere near these pleated structures resembles the hysteresis phenomenon typical of first-order phase transitions. The reconstructed manifold is similar to the “temperature-pressure-density” diagrams of equilibrium phase transitions. The singular spectra of vBs, AL, and combined data have the power law dependence typical of second-order phase transitions and self-organized criticality. The magnetosphere thus exhibits the signatures of both self-organization and self-organized criticality. It is concluded that the magnetospheric substorm is neither a pure catastrophe of the low-dimensional system nor a random set of avalanches of different scales described by the simple sandpile models. The substorms behave like nonequilibrium phase transitions, with features of both first- and second-order phase transitions.
Is 89 Herculis a binary star

A periodicity of about 285 days has been found in the 1977-81 radial velocities of the yellow supergiant variable 89 Her (HR 6685) which has a pulsational period of about 63.5 days. This is interpreted as being due to orbital motion around an unseen companion. The orbital parameters are computed and seem to favor the high mass case (between 13 and 24 solar mass) for 89 Her. Several possibilities for the nature of the presumed companion are considered.
Magnetic Hydroxyapatite Composite Nanoparticles for Augmented Differentiation of MC3T3-E1 Cells for Bone Tissue Engineering

Progressive aging harms bone tissue structure and function and, thus, requires effective therapies focusing on permanent tissue regeneration rather than partial cure, beginning with regenerative medicine. Due to advances in tissue engineering, stimulating osteogenesis with biomimetic nanoparticles to create a regenerative niche has gained attention for its efficacy and cost-effectiveness. In particular, hydroxyapatite (HAP, Ca10(PO4)6(OH)2) has gained significant interest in orthopedic applications as a major inorganic mineral of native bone. Recently, magnetic nanoparticles (MNPs) have also been noted for their multifunctional potential for hyperthermia, MRI contrast agents, drug delivery, and mechanosensitive receptor manipulation to induce cell differentiation, etc. Thus, the present study synthesizes HAP-decorated MNPs (MHAP NPs) via the wet chemical co-precipitation method. Synthesized MHAP NPs were evaluated against the preosteoblast MC3T3-E1 cells towards concentration-dependent cytotoxicity, proliferation, morphology staining, ROS generation, and osteogenic differentiation. The result evidenced that MHAP NPs concentration up to 10 µg/mL was non-toxic even with the time-dependent proliferation studies. As nanoparticle concentration increased, FACS apoptosis assay and ROS data showed a significant rise in apoptosis and ROS generation. The MC3T3-E1 cells cocultured with 5 µg/mL MHAP NPs showed significant osteogenic differentiation potential. Thus, MHAP NPs synthesized with simple wet chemistry could be employed in bone regenerative therapy.
Older Adults and Immune Thrombocytopenia: Considerations for the Clinician

Abstract Many epidemiological studies have shown that the incidence of immune thrombocytopenia (ITP) increases after age 60 years and peaks in patients over age 80 years. Therefore, ITP is a concern for physicians taking care of older patients, especially regarding its diagnosis and management. The diagnostic work-up should exclude other causes of thrombocytopenia and secondary ITP, including myelodysplastic syndrome and drug-induced ITP. The treatment decision is influenced by an increased risk of bleeding, infectious diseases and thrombosis in this population and should take into account comorbidities and concomitant medications such as anticoagulant drugs. First-line treatment is based on short corticosteroids courses and intravenous immunoglobulin, which should be reserved for patients with more severe bleeding complications, with their higher risk of toxic effects as compared with younger patients. Second-line treatment should be tailored to the patient’s history, comorbidities and preferences. Preferred second-line treatments are thrombopoietin receptor agonists for most groups and guidelines given their good efficacy/tolerance ratio, but the thrombotic risk is increased in older people. Other second-line options that can be good alternatives depending on the clinical context include rituximab, dapsone, fostamatinib or immunosuppressive drugs. Splenectomy is less often performed but remains an option for fit patients with chronic refractory disease. Emerging treatments such as Syk or Bruton tyrosine kinase inhibitors and FcRn antagonists are becoming available for ITP and may modify the treatment algorithm in the near future. The aim of this review is to describe the particularities of the diagnosis and treatment of ITP in older people, including the response and tolerance to the currently available drugs. We also discuss some situations related to co-morbidities that can frequently lead to adapt the management strategy in older patients.
Comment on ``Accurate Hartree-Fock energy of extended systems using large Gaussian basis sets''

In a recent paper on Hartree-Fock (HF) calculations on solid LiH with large Gaussian-type basis sets, Paier et al. [Phys. Rev. B 80, 174114 (2009)] report a comment that we dispute: that similar calculations appear unlikely to be feasible using the CRYSTAL code. Here we show that using a full HF approach within periodic boundary conditions as implemented in the CRYSTAL code the same total energy is obtained as from the schemes adopted by Paier et al.
A characterization of strictly convex Banach spaces

A very short proof is given for Petryshyn's characterization of strictly convex Banach spaces l_2j. Let X be a real Banach space. Now X is strictly convex (s.c.) iff every j £ X attains a maximum on at most one point of the unit sphere [l]. A duality mapping is a function /: X—>2 which satisfies /(x) = {/ £ X : ¡(x) = u/11 ||x|| and ||/|| = ||x||! We say that / is strictly monotone if for every x 4 y and every / £ J(x), g £ J(y) we have (/ g)(x y) > 0 [2], For / £ }(x), g £ ](y), we see from the following expansion due to Browder that if-g)ix y) = (||*|| ||y||)2 + (U/H llyl! fiy)) + (||g|| 11*11 gix)) > 0. Theorem (Petryshyn). X is s.c. iff ] is strictly monotone. Proof. Since each term of Browder's expansion is nonnegative we have: / is not strictly monotone <=> 3 x ^ y, / e J(x), g £ }(y) with (/ _ g)(x y) = 0 « 3 / £ X* with /(x/||x||) = /(y/||y|i) = Ü/II = ||x|| = ||y|| <=> 3 / £ X that attains a maximum at two points of the unit sphere. REFERENCES 1. N. Dunford and J. T. Schwartz, Linear operators. I: General theory, Pure and Appl. Math., vol. 7, Interscience, New York and London, 1958. MR 22 #8302. 2. W. Petryshyn, A characterization of strict convexity of Banach spaces and other uses of duality mappings, J. Functional Analysis 6 (1970), 282—291. MR 44 #4496. Received by the editors April 18, 1974. AMS (MOS) subject classifications (1970). Primary 46B10; Secondary 47H05.