Miracle-dz/UniFAR-FTUs huggingface dataset:
Solar radiation pressure perturbations for Earth satellites II. an approximate method to model penumbra transitions and their long-term orbital effects on LAGEOS

We have developed an approximate version of our theory (Vokrouhlicky et al. 1993c) for the perturbing force due to solar radiation pressure undergone by artificial Earth satellites when they cross the penumbra zones. The relative discrepancies in the instantaneous acceleration values with respect to the complete theory are generally smaller than 1%, and no systematic pattern resulting into spurious long-term perturbations arises. At the same time, the approximate approach leads to a considerable gain in the computing time needed for evaluating the perturbing force, typically an improvement by a factor 10 to 50. As a consequence, the theory is now suitable for implementation in the orbit analysis/determination codes used in space geodesy
Approximation rate and invertibility for some singular integral operators

We consider discrete analogues of multi‐dimensional singular integrals and integral operators in a half‐space in square integrable and Hölder spaces with weight, and invertibility of discrete operators, and give the approximation rate for discrete operators. (© 2013 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Dissipativity and global stabilizability of nonlinear systems

In this paper, a "normal form" for the supply rate of an arbitrary dissipative nonlinear system is proposed. On the basis of this "normal form", the connection between notions of dissipativeness and stabilizability by linear constant feedback is investigated. It is shown that a dissipative zero-state detectable system can be robust globally asymptotically stabilized by linear constant feedback; some converse theorems are proved.
Instantons on the 5-sphere and M5-branes

We calculate the partition functions of supersymmetric gauge theories on S^5, which acquire non-perturbative contributions from instanton loops wrapping its Hopf fiber. The instantons on the CP^2 base equivariantly localize to 3 fixed points of SU(3) Cartans. Using our results, we study the index of the 6d (2,0) theory. We first study the partition functions of maximal SYM with AD(E) gauge groups, which agree with the gravity dual indices on AdS_7 in the large N limits. We also show that the most general partition function of the Abelian theory agrees with the index for a free 6d tensor supermultiplet. We explain possible ambiguities in our 5d approach, role of maximal SUSY, and the Wilson loops on S^5 dual to M2-brane Wilson surfaces in AdS_7.
THE CLUSTERING OF GALAXIES IN THE SDSS-III BARYON OSCILLATION SPECTROSCOPIC SURVEY: LUMINOSITY AND COLOR DEPENDENCE AND REDSHIFT EVOLUTION

We measure the luminosity and color dependence and the redshift evolution of galaxy clustering in the Sloan Digital Sky Survey-III Baryon Oscillation Spectroscopic Survey Ninth Data Release. We focus on the projected two-point correlation function (2PCF) of subsets of its CMASS sample, which includes about 260,000 galaxies over ∼3300 deg2 in the redshift range 0.43 < z < 0.7. To minimize the selection effect on galaxy clustering, we construct well-defined luminosity and color subsamples by carefully accounting for the CMASS galaxy selection cuts. The 2PCF of the whole CMASS sample, if approximated by a power-law, has a correlation length of r0 = 7.93 ± 0.06 h−1 Mpc and an index of γ = 1.85 ± 0.01. Clear dependences on galaxy luminosity and color are found for the projected 2PCF in all redshift bins, with more luminous and redder galaxies generally exhibiting stronger clustering and steeper 2PCF. The color dependence is also clearly seen for galaxies within the red sequence, consistent with the behavior of SDSS-II main sample galaxies at lower redshifts. At a given luminosity (k + e corrected), no significant evolution of the projected 2PCFs with redshift is detected for red sequence galaxies. We also construct galaxy samples of fixed number density at different redshifts, using redshift-dependent magnitude thresholds. The clustering of these galaxies in the CMASS redshift range is found to be consistent with that predicted by passive evolution. Our measurements of the luminosity and color dependence and redshift evolution of galaxy clustering will allow for detailed modeling of the relation between galaxies and dark matter halos and new constraints on galaxy formation and evolution.
Superlogic manifolds and geometric approach to quantum logic

The main purpose of this paper is to present a new approach to logic or what we will call superlogic. This approach constitutes a new way of looking at the connection between quantum mechanics and logic. It is a geometrization of the quantum logic. Note that this superlogic is not distributive reflecting a good propriety to describe quantum mechanics, non-commutative spaces and contains a nilpotent element.
M54 + SAGITTARIUS = ω CENTAURI

We derive homogeneous abundances of Fe, O, Na, and α-elements from high-resolution FLAMES spectra for 76 red giant stars in NGC 6715 (M54) and for 25 red giants in the surrounding nucleus of the Sagittarius (Sgr) dwarf galaxy. Our main findings are the following. (1) We confirm that M54 shows intrinsic metallicity dispersion, ∼0.19 dex rms. (2) When the stars of the Sgr nucleus are included, the metallicity distribution strongly resembles that in ω Cen; the relative contribution of the most metal-rich stars is, however, different in these two objects. (3) In both globular clusters (GCs) there is a very extended Na–O anticorrelation, which is a signature of different stellar generations born within the cluster. (4) The metal-poor and metal-rich components in M54 (and ω Cen) show clearly distinct extension of the Na–O anticorrelation, the most heavily polluted stars being those of the metal-rich component. We propose a tentative scenario for cluster formation that could explain these features. Finally, similarities and differences found in the two most massive GCs in our Galaxy can be easily explained if they are similar objects (nuclear clusters in dwarf galaxies) observed at different stages of their dynamical evolution.
Plasmas in the laboratory and in the universe : new insights and new challenges, Como, Italy 16-19 September 2003

The volume illustrates the State of the art and new directions in plasma physics, space physics, and astrophysics. It covers several hot topics of interdisciplinary interest where progress is made by the use of joint expertise. It summarizes an unusually lively symposium that has gathered world experts with a broad spectrum of research interests. Interdisciplinary meetings at the border between plasma physics and astrophysics are becoming increasingly important. In the recent past, several proceedings volumes have been devoted to astrophysical plasmas. This volume has the unique feature of being professional but not specialized, because it covers an unusually broad spectrum of topics under the common theme of the study of complex and collective phenomena in macroscopic systems, from the scale of laboratory plasma experiments to the scale of the universe. Included are:- basic plasma processes- space plasmas, planetary plasmas, and the heliosphere- solar and stellar plasmas - plasmas around compact objects- plasmas in galaxies - plasmas in clusters of galaxies- cosmological plasmas- testing plasma astrophysics in the laboratory
Multi-responsive rotaxane with tunable fluorescence under azobenzene-based benzoxazine structure

Rotaxanes are known for the mechanically interlocked molecules for decades. The present work demonstrates a method to prepare multi-responsive rotaxane by conjugating with a multi-responsive supramolecule. Benzoxazine dimers, N, N’-bis(3,5-dimethyl-2-hydroxybenzyl) methylamine derivatives, are good models because their simple chemistry. An azobenzene containing benzoxazine with remaining hydroxyl group for further conjugation with rotaxane was designed. The ring opening of rotaxane using fluorescent phenol provides benzoxazine dimer with metal ion responsive and fluorescent properties. Based on this concept, light responsive benzoxazine conjugated with rotaxane system shows light, metal ion and rotaxane shuttling responsiveness which can be followed by fluorescent signals. The present work shows simple way to develop rotaxanes with multi-responsive functions using supramolecular chemistry of benzoxazine dimer prepared from light responsive phenol.
Risk Assessment and Possible Solutions of Brain-Computer Interface Technologies

: There has been rapid development in Brain-computer interface (BCI) technology in recent years, the current research results indicate that BCI are characterized not only by high values of application but also by broad prospects of application. However, some potential risks are accompanied by the rapid development of BCI technology , such as technical security risk, privacy risk, autonomy risk and fairness risk. On the whole, these risks are objective and dynamic. Whether we can use these technologies depends on the balance of the risks and benefits. We should pay full attention to the risks of brain-computer interfaces, and respond to them from four aspects: identification of risks, assessment of risks, warning of risks, and control of risks.
Simultaneous multiple surfaces method applied to infrared lenses

In optical design, the designer's experience is critical. Indeed, an experienced optical designer will often choose a better starting point for optimization than an inexperienced one. Most of the time, lens design software use a local optimization algorithm, which is why the starting point is so important to get an excellent optical system. We present here an alternative to the classical optical design method and a solution to reduce the impact of the designer's experience. Our alternative couples the Simultaneous Multiple Surfaces (SMS) method, introduced by Benítez and Miñano with optimization in Zemax OpticStudio. The SMS method is a direct construction method of optical systems without optical aberrations for as many field points as the system contains surfaces. This method can deal with both aspheric and freeform optical systems depending on the dimension of the method implemented. Our implementation of the SMS method can design optical systems with three surfaces. We use the SMS method to define a freeform system with an F-number of 0.85. Then, we use this fast freeform system as a starting point to perform further optimization in Zemax OpticStudio. Finally, we achieve to design two diffraction-limited freeform systems, one over a square field of view of ±30° and another over a rectangular field of view of ±33° × ±26°.
Probing the wavefunction of the surface states in Bi2Se3 topological insulator: a realistic tight-binding approach

We present results of a microscopic tight-binding modeling of Bi 2 ? > Se 3 ? > three-dimensional topological insulator using a sp 3 ? > Slater–Koster Hamiltonian, with parameters calculated from density functional theory. Based on the calculated atomic- and orbital-projections of the wavefunctions associated with valence- and conduction-band states at the center of the Brillouin zone, we propose a real-space description of band inversion for both bulk and a slab of finite thickness. A systematic analysis of the key features of the surface states, in particular the spatial distribution and the spin-character of the surface states wavefunction, is carried out for slabs of different thickness, ranging from one to tens of quintuple layers. We obtain an estimate of the slab thickness at which the energy gap induced by interaction between the top and bottom surface states becomes negligible, based on the present available numerical precision. We anticipate that this finding will be relevant for all microscopic calculations addressing the effect of external perturbations on the surface states near the Dirac point. The modifications in the helical spin-texture of the Dirac-cone surface states, in the form of in-plane and out-of-plane spin projections, are calculated as a function of the slab thickness. These calculations are important for the interpretation of ongoing experiments, which probe the spin-polarization of the surface states in topological insulator thin films.
Photo-induced ionization dynamics of the nitrogen vacancy defect in diamond investigated by single-shot charge state detection

The nitrogen–vacancy centre (NV) has drawn much attention for over a decade, yet detailed knowledge of the photophysics needs to be established. Under typical conditions, the NV can have two stable charge states, negative (NV−) or neutral (NV0), with photo-induced interconversion of these two states. Here, we present detailed studies of the ionization dynamics of single NV centres in bulk diamond at room temperature during illumination and its dependence on the excitation wavelength and power. We apply a recent method which allows us to directly measure the charge state of a single NV centre, and observe its temporal evolution. We find that the steady-state NV− population is always ⩽75% for 450–610 nm excitation wavelength. In combination with saturation measurements, we show that the optimal excitation wavelength is around 510–540 nm. Furthermore, the relative absorption cross-section of NV− is determined for 540–610 nm, revealing a double-peak structure. Finally, the energy of the NV− ground state of 2.6 eV below the conduction band is measured. These results reveal new insights into the charge state dynamics of the NV centre.
Spatial fluctuations in transient creep deformation

We study the spatial fluctuations of transient creep deformation of materials as a function of time, both by digital image correlation (DIC) measurements of paper samples and by numerical simulations of a crystal plasticity or discrete dislocation dynamics model. This model has a jamming or yielding phase transition, around which power law or Andrade creep is found. During primary creep, the relative strength of the strain rate fluctuations increases with time in both cases—the spatially averaged creep rate obeys the Andrade law ϵt ∼ t − 0.7, while the time dependence of the spatial fluctuations of the local creep rates is given by Δϵt ∼ t − 0.5. A similar scaling for the fluctuations is found in the logarithmic creep regime that is typically observed for lower applied stresses. We review briefly some classical theories of Andrade creep from the point of view of such spatial fluctuations. We consider these phenomenological, time-dependent creep laws in terms of a description based on a non-equilibrium phase transition separating evolving and frozen states of the system when the externally applied load is varied. Such an interpretation is discussed further by the data collapse of the local deformations in the spirit of absorbing state/depinning phase transitions, as well as deformation–deformation correlations and the width of the cumulative strain distributions. The results are also compared with the order parameter fluctuations observed close to the depinning transition of the 2d linear interface model or the quenched Edwards–Wilkinson equation.
Marangoni Patterns in a Non-Isothermal Liquid with Deformable Interface Covered by Insoluble Surfactant

Marangoni patterns are created by instabilities caused by thermocapillary and solutocapillary stresses on the deformable free surface of a thin liquid layer. In the present paper, we consider the influence of the insoluble surfactant on the selection and modulational instability of stationary Marangoni patterns near their onset threshold. The basic governing parameters of the problem are the Biot number characterizing the heat-transfer resistances of and at the surface, the Galileo number indicating the role of gravity via viscous forces, and the elasticity number specifying the influence of insoluble surfactant on the interfacial dynamics of the liquid. The paper includes a review of the previous results obtained in that problem as well as new ones.
State-of-the-Art of Myocardial Perfusion by CMR: A Practical View

Ischemic heart disease (IHD) outstands among diseases threatening public health. Essential for its management are the continuous advances in medical and interventional therapies, although a prompt and accurate diagnosis and prognostic stratification are equally important. Besides information on the anatomy of coronary arteries, well covered nowadays by invasive and non-invasive angiographic techniques, there are also other components of the disease with clinical impact, as the presence of myocardial necrosis, the extent of pump function impairment, and the presence and extent of inducible myocardial ischemia, that must be considered in every patient. Cardiovascular Magnetic Resonance (CMR) is a multiparametric diagnostic imaging technique that provides reliable information on these issues. Regarding the detection and grading of inducible ischemia in particular, the technique has been widely adopted in the form of myocardial perfusion sequences under vasodilator stress, which is the subject of this review. While the analysis of images is conventionally performed by visual inspection of dynamic first-pass studies, with the inherent dependency on the operator capability, the recent introduction of a reliable application of quantitative perfusion (QP) represents a significant advance in the field. QP is based on a dual-sequence strategy for conversion of signal intensities into contrast agent concentration units and includes a full automatization of processes such as myocardial blood flow (MBF) calculation (in mL/min/g), generation of a pixel-wise flow mapping, myocardial segmentation, based on machine learning, and allocation of MBF values to myocardial segments. The acquisition of this protocol during induced vasodilation and at rest gives values of stress/rest MBF (in mL/min/g) and myocardial perfusion reserve (MPR), both global and per segment. Dual-sequence QP has been successfully validated against different reference methods, and its prognostic value has been shown in large longitudinal studies. The fact of the whole process being automated, without operator interaction, permits to conceive new interesting scenarios of integration of CMR into systems of entirely automated diagnostic workflow in patients with IHD.
LGBTI+fobia virtual: notas sobre uma etnografia em comunidades virtuais no Facebook

O artigo discute a LGBTI+fobia em ambientes virtuais, a partir de etnografia virtual realizada em duas comunidades virtuais no Facebook, “Brasil sem ideologia de gênero” e “Não à ditadura gay”. A observação silenciosa (lurking) ocorreu no período 2018 a 2019, sendo analisadas 75 postagens. Seguiu-se um roteiro que buscou identificar as características dos membros, o perfil de interação, a arquitetura das comunidades, e também a percepção dos membros sobre expressões de sexualidade e gênero dissidentes da heteronormatividade. A LGBTI+fobia começa a ficar mais perceptível a partir de discursos de ódio de natureza ultraconservadora e simbólica, que se utiliza de elementos como humor, política, desinformação, e deturpação de dados científicos, visando deslegitimar a existência da população LGBTI+, justificar a retirada de direitos, e minimizar suas pautas. Destacou-se a necessidade de observação das plataformas responsáveis por esses ambientes digitais, como também a importância de uma alfabetização digital da população, de modo a capacitá-la ao uso crítico e responsável desses ambientes digitais.
Estimation of Multiple Illuminant Colors Using Color Line Features

SUMMARY The colors of objects in natural images are a ﬀ ected by the color of lighting, and accurately estimating an illuminant’s color is indispensable in analyzing scenes lit by colored lightings. Recent lighting environments enhance colorfulness due to the spread of light-emitting diode (LED) lightings whose colors are ﬂexibly controlled in a full visible spectrum. However, existing color estimations mainly focus on the single illu-minant of normal color ranges. The estimation of multiple illuminants of unusual color settings, such as blue or red of high chroma, has not been studied yet. Therefore, new color estimations should be developed for multiple illuminants of various colors. In this article, we propose a color estimation for LED lightings using Color Line features, which regards the color distribution as a straight line in a local area. This local estimate is suitable for estimating various colors of multiple illuminants. The features are sampled at many small regions in an image and aggregated to estimate a few global colors using supervised learning with a convolutional neural network. We demonstrate the higher accuracy of our method over existing ones for such colorful lighting environments by producing the image dataset lit by multiple LED lightings in a full-color range.
Threshold multiparty multi‐randomness secure partially homomorphic encryption for data security in cloud

Threshold cryptography is used to secure a cryptographic secret by dividing it into N shares and storing each claim on a diverse server. Any subgroup of t servers can use the secret without re‐making it. However, an adversary cannot recover the secret by compromising t − 1 servers. Homomorphic encryption operates directly on the ciphertext. In this study, a Threshold multiparty multi‐randomness secure partially homomorphic encryption (TM‐MR‐SPHE) algorithm is proposed to secure the outsourced data and perform multiplication and division operations on the ciphertext. The model is implemented in Eclipse IDE and AWS Toolkit for Eclipse and deployed in Amazon Elastic Beanstalk (EB) environment. This model is mainly used to secure the patient e‐health details and perform computation on outsourced data. The patient details are encrypted by the algorithm MR‐SPHE and uploaded in AWS (Amazon Web Service) S3 bucket. AWS identity and access management (IAM) creates the users' service and secret shares among multiple users in the EB environment. The proposed model performance is studied by comparing with other partially homomorphic Elgamal, Pailler, and Benaloh. This model achieves data integrity and confidentiality using the threshold multiparty with multi‐randomness secure partially homomorphic encryption.
Traveling Wave Solutions of the Porous Medium Equation

We prove the existence of a one-parameter family of solutions of the porous medium equation, a nonlinear heat equation. In our work, with space dimension 3, the interface is a half line whose end point advances at constant speed. We prove, by using maximum principle, that the solutions are stable under a suitable class of perturbations. We discuss the relevance of our solutions, when restricted to two dimensions, to gravity driven flows of thin films. Here we extend the results of J. Iaia and S. Betelu in the paper "Solutions of the porous medium equation with degenerate interfaces" to a higher dimension.
Magnetocapacitance of a graphene monolayer

We present a theoretical study of magnetocapacitance in a graphene monolayer at finite temperature taking into account the effects of disorder. The density of states (DOS) and magnetocapacitance found for graphene are compared to those found in standard two dimensional electron gas (2DEG) systems. The magnetic oscillations in DOS and magnetocapacitance are found to be enhanced and much more robust with respect to temperature damping in monolayer graphene in comparison with a 2DEG. Furthermore, we find that there is a $\pi$ phase shift between magnetic oscillations in the two systems which can be attributed to Dirac electrons in graphene acquiring a Berry's phase as they traverse a closed path in a magnetic field.
Categorical Aspects in Pasch Geometry

In this study, after introducing Pasch geometries and algebraic properties of their, we studied categorical structure of the categories of Pasch geometries with morphisms and homomorphisms. In this regard, definition and construction of some categorical objects such as: equalisers, pullbacks, initial and terminal objects and products are given.