Hopfield Neural Network deconvolution for weak lensing measurement

Weak gravitational lensing has the potential to place tight constraints on the equation of the state of dark energy. However, this will only be possible if shear measurement methods can reach the required level of accuracy. We present a new method to measure the ellipticity of galaxies used in weak lensing surveys. The method makes use of direct deconvolution of the data by the total Point Spread Function (PSF). We adopt a linear algebra formalism that represents the PSF as a Toeplitz matrix. This allows us to solve the convolution equation by applying the Hopfield Neural Network iterative scheme. The ellipticity of galaxies in the deconvolved images are then measured using second order moments of the autocorrelation function of the images. To our knowledge, it is the first time full image deconvolution is used to measure weak lensing shear. We apply our method to the simulated weak lensing data proposed in the GREAT10 challenge and obtain a quality factor of Q=87. This result is obtained after applying image denoising to the data, prior to the deconvolution. The additive and multiplicative biases on the shear power spectrum are then +0.000009 and +0.0357, respectively.Comment: 10 pages, 11 figures and 2 tables, accepted for publication in A&

On the effect of image denoising on galaxy shape measurements

Weak gravitational lensing is a very sensitive way of measuring cosmological parameters, including dark energy, and of testing current theories of gravitation. In practice, this requires exquisite measurement of the shapes of billions of galaxies over large areas of the sky, as may be obtained with the EUCLID and WFIRST satellites. For a given survey depth, applying image denoising to the data both improves the accuracy of the shape measurements and increases the number density of galaxies with a measurable shape. We perform simple tests of three different denoising techniques, using synthetic data. We propose a new and simple denoising method, based on wavelet decomposition of the data and a Wiener filtering of the resulting wavelet coefficients. When applied to the GREAT08 challenge dataset, this technique allows us to improve the quality factor of the measurement (Q; GREAT08 definition), by up to a factor of two. We demonstrate that the typical pixel size of the EUCLID optical channel will allow us to use image denoising.Comment: Accepted for publication in A&A. 8 pages, 5 figure

Thermodynamic modeling of the reaction of simultaneous interaction of nickel (II), cobalt (II) and iron (III) oxides with carbon

This paper considers thermodynamic modeling of electric smelting of Allarechenskoye deposit dumps for nickel, cobalt, and iron extraction. Thermochemical transformations in the reaction of interaction of carbon with oxides of nickel (II), cobalt (II) and iron (III) are considered. The investigations of thermochemical transformations of the chemical-phase composition of the system were carried out using the software complex “Astra-4” developed by a team of scientists at the Bauman Moscow State Technical University. Thermochemical transformations and chemical-phase composition of the system as a function of T (temperature) and P (pressure) were studied. In particular, the temperature was in the range from 973K to 1773K and the pressure range was taken from 0.001 MPa to 0.1 MPa. According to the results, it was found that iron in the system transitions to condensed iron, with the degree of transition (αFe) from 29.0% at T = 1173K to 99.1% at 1773K, the degree of transitions of nickel to condensed nickel is 100% before T = 1273K, and with an increase in temperature from 1273K to 1773K decreases to 99,98%; the transition of cobalt to the gas phase is distributed similarly to nickel

METHODS OF NON-DRUG THERAPY IN PATIENTS WITH POLYNEUROPATHY CAUSED BY COMBINED ACTION OF GENERAL VIBRATION AND PHYSICAL ACTIVITY

We carried out comparative estimation of treatment of polyneuropathy of extremities caused by exposure of general vibration and physical activity with use of travelling magnetic field on the extremity and. organ-mineral napkins on the basis of "extraction" of sludge dirt rich with mineral salts and. wide complex of microelements. As the result of performed therapy we registered regress of main symptoms and. improvement of electrophysiological indices

Alkaline hydrolysis of wool fat (lanolin) in a medium of proton and aprotic solvents

The raw material being studied is the woolen fat of the sheep of the Edilbay fine-fleece and Kazakh arkharomeric fine-fleece, which is excreted when washing wool in primary wool processing plants (PWP) in the regions of Kazakhstan, such as Semipalatinsk, Aktyubinsk, Zhambyl and Tokmak. Earlier we obtained anhydrous lanolin from the fat of various factories of the PWP. In both cases, positive results were obtained and a certificate of compliance of anhydrous lanolin FS RK was obtained. In terms of its chemical composition, wool fat is a mixture of C10-C16 carboxylic acid esters with aliphatic, terpenic, triterpene and sterol alcohols. It also contains vitamins, proteins, sterols and other physiologically active compounds. In the hydrolysis of wool fat, a mixture of sterol alcohols, triterpene alcohols and fatty acid salts are assumed. Valuable among them are sterol alcohols, which constitute up to 29% of the sum of all alcohols. Cholesterol and its derivatives are the raw materials for the synthesis of steroid drugs. Salts of fatty acids are used as an emulsifier in pharmacy and cosmetology. The aim of this paper is to complete the saponification of wool fat and the separation of a mixture of sterol alcohols. We show the patterns of alkaline hydrolysis of wool fat in the liquid phase in the presence of mixtures of various solvents. As a solvent, the ethanol-water, isopropanol-water system in which wool fat is only partially dissolved has been studied. In the wool fat-alcohol-water-NaOH system, a stable emulsion is formed. Ways that prevent the formation of an emulsion are proposed

GREAT3 results I: systematic errors in shear estimation and the impact of real galaxy morphology

We present first results from the third GRavitational lEnsing Accuracy Testing (GREAT3) challenge, the third in a sequence of challenges for testing methods of inferring weak gravitational lensing shear distortions from simulated galaxy images. GREAT3 was divided into experiments to test three specific questions, and included simulated space- and ground-based data with constant or cosmologically-varying shear fields. The simplest (control) experiment included parametric galaxies with a realistic distribution of signal-to-noise, size, and ellipticity, and a complex point spread function (PSF). The other experiments tested the additional impact of realistic galaxy morphology, multiple exposure imaging, and the uncertainty about a spatially-varying PSF; the last two questions will be explored in Paper II. The 24 participating teams competed to estimate lensing shears to within systematic error tolerances for upcoming Stage-IV dark energy surveys, making 1525 submissions overall. GREAT3 saw considerable variety and innovation in the types of methods applied. Several teams now meet or exceed the targets in many of the tests conducted (to within the statistical errors). We conclude that the presence of realistic galaxy morphology in simulations changes shear calibration biases by $\sim 1$ per cent for a wide range of methods. Other effects such as truncation biases due to finite galaxy postage stamps, and the impact of galaxy type as measured by the S\'{e}rsic index, are quantified for the first time. Our results generalize previous studies regarding sensitivities to galaxy size and signal-to-noise, and to PSF properties such as seeing and defocus. Almost all methods' results support the simple model in which additive shear biases depend linearly on PSF ellipticity.Comment: 32 pages + 15 pages of technical appendices; 28 figures; submitted to MNRAS; latest version has minor updates in presentation of 4 figures, no changes in content or conclusion

Нетоз в патогенезе антифосфолипидного синдрома и системной красной волчанки

Antiphospholipid syndrome (APS) and systemic lupus erythematosus (SLE) are autoimmune diseases. In recent years, APS has been considered as an autoimmune thrombo-inflammatory disease. It has been established that clinical manifestations of APS can persist, progress over time, or debut during an adequate anticoagulant therapy and, in some cases, require administration of immunosuppressive drugs, which indicates the role of autoimmune inflammation in their development. The formation of extracellular neutrophil traps (neutrophil extracellular traps, NETs) is one of the connecting links of inflammation and thrombosis. Netosis is the process by which activated neutrophils in the extracellular space form netlike structures (NETs). This review examines the role of neutrophils and netosis in the pathogenesis of APS and SLE.Антифосфолипидный синдром (АФС) и системная красная волчанка (СКВ) являются аутоиммунными заболеваниями. В последние годы АФС рассматривается как аутоиммунное тромбовоспалительное заболевание. Установлено, что клинические проявления АФС могут персистировать, прогрессировать со временем или дебютировать на фоне адекватной антикоагулянтной терапии и в некоторых случаях требуют назначения иммуносупрессивных препаратов, что указывает на роль аутоиммунного воспаления в их развитии. Образование внеклеточных нейтрофильных ловушек (neutrophil extracellular traps, NETs) является одним из связующих звеньев воспаления и тромбоза. Нетоз представляет собой процесс, при котором активированные нейтрофилы во внеклеточном пространстве формируют «сетеподобные» структуры (NETs). В данном обзоре рассмотрена роль нейтрофилов и нетоза в патогенезе АФС и СКВ

Роль нейтрофилов в патогенезе болезни Бехчета

Behcet's disease (BD) is a systemic vasculitis of unknown etiology, characterized by damage of vessels of any type and caliber, manifested by recurrent ulcerative process in the oral cavity and genital organs, eye damage, joints, gastrointestinal tract, central nervous system and other organs involvement. The pathogenesis of the disease is complex. The contribution of both innate and adaptive immune responses is noted. A feature of BD is hyperactivation of neutrophils and neutrophilic infiltration of affected tissues.The review presents data from studies related to the assessment of the main functions of neutrophils in this disease.Болезнь Бехчета (ББ) – системный васкулит неизвестной этиологии, характеризующийся поражением сосудов любого типа и калибра, проявляющийся рецидивами язвенного процесса в ротовой полости и на гениталиях, поражением глаз, суставов, желудочно-кишечного тракта, центральной нервной системы и других органов. Патогенез заболевания сложен. Отмечается вклад как врожденного, так и адаптивного иммунного ответа. Особенностью ББ является гиперактивация нейтрофилов и нейтрофильная инфильтрация пораженных тканей.В обзоре представлены данные исследований, связанных с оценкой основных функций нейтрофилов при данном заболевании