99 research outputs found

    Noise diodes as a source of entropy for hardware random number generators

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    The purpose of this article is to describe the use of digital noise generators based on semiconductor noise diodes as part of systems for generating key numerical sequences used in cryptographic security methods. The classification of modern methods of cryptographic protection and the algorithms underlying them are considered. It is shown that ensuring high information entropy in systems for generating encryption keys is possible by using generators of truly random number sequences and cryptographically secure generators of pseudo-random number sequences. A number of disadvantages inherent in widely used sources of physical noise are described, namely: low spectral density of broadband noise, limited frequency range, nonlinearity of the noise spectrum, difficulties in technical implementation when using some methods, especially under conditions of extreme temperatures and exposure to special factors. It has been confirmed that the noise properties of semiconductor noise diodes depend on the composition and constancy of the defect-impurity structure, and defect engineering makes it possible to control their electrical parameters. The study of inhomogeneities and defects in noise diodes and the development on this basis of methods for controlling the level of structural defects made it possible to create technologies for their generation and annealing, and to improve a number of electrical and statistical properties of noise diodes

    The open abdomen in trauma and non-trauma patients: WSES guidelines

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    Track reconstruction and matching between emulsion and silicon pixel detectors for the SHiP-charm experiment

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    In July 2018 an optimization run for the proposed charm cross section measurement for SHiP was performed at the CERN SPS. A heavy, moving target instrumented with nuclear emulsion films followed by a silicon pixel tracker was installed in front of the Goliath magnet at the H4 proton beam-line. Behind the magnet, scintillating-fibre, drift-tube and RPC detectors were placed. The purpose of this run was to validate the measurement's feasibility, to develop the required analysis tools and fine-tune the detector layout. In this paper, we present the track reconstruction in the pixel tracker and the track matching with the moving emulsion detector. The pixel detector performed as expected and it is shown that, after proper alignment, a vertex matching rate of 87% is achieved

    Measurement of the muon flux from 400 GeV/c protons interacting in a thick molybdenum/tungsten target

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    The SHiP experiment is proposed to search for very weakly interacting particles beyond the Standard Model which are produced in a 400 GeV/c proton beam dump at the CERN SPS. About 1011 muons per spill will be produced in the dump. To design the experiment such that the muon-induced background is minimized, a precise knowledge of the muon spectrum is required. To validate the muon flux generated by our Pythia and GEANT4 based Monte Carlo simulation (FairShip), we have measured the muon flux emanating from a SHiP-like target at the SPS. This target, consisting of 13 interaction lengths of slabs of molybdenum and tungsten, followed by a 2.4 m iron hadron absorber was placed in the H4 400 GeV/c proton beam line. To identify muons and to measure the momentum spectrum, a spectrometer instrumented with drift tubes and a muon tagger were used. During a 3-week period a dataset for analysis corresponding to (3.27±0.07) × 1011 protons on target was recorded. This amounts to approximatively 1% of a SHiP spill

    Search for pair production of excited top quarks in the lepton+jets final state

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    Gut Microbiota Species Can Provoke both Inflammatory and Tolerogenic Immune Responses in Human Dendritic Cells Mediated by Retinoic Acid Receptor Alpha Ligation

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    La implementación de la estrategia del marketing directo construida sobre las ecuaciones estructurales permitirán garantizar que el potencial cliente se convierta en un cliente cautivo; este cambio es ilustrado por el modelo de Gemma Muñoz & Elósegui (2012), en el cual se precisan cuatro etapas, desde la captación hasta la retención; en la presente investigación se ha considerado en los objetivos cada etapa; además en cada una se han definido los indicadores de gestión, los cuales definen, a la vez, la información que permitirá conocer el avance en términos de preferencias. La investigación es cuantitativa, descriptiva y tecnológica; su diseño es cuasi experimental, con un muestreo no probabilístico, cuya muestra ha sido determinada por conveniencia, conformada por los potenciales clientes de la Escuela Profesional de Ingeniería de Sistemas y de los programas. Los resultados de la investigación indican que la estrategia emocional de Neuromarketing directo 3.0 mejoró el tiempo de búsqueda de páginas por sesión, en un 26.001%; además el valor de p=0,000 fue significativo, porque es menor al nivel de significancia, quedando comprobada la hipótesis específica. Así mismo, se demostró que esta estrategia emocional de NeuroMarketing directo 3.0 mejoró en un 36.25% la conversión de usuarios potenciales de las carreras de la Universidad Peruana Unión, cuyo valor de p=0,061, menor al nivel de significancia del 0.05, confirma la aprobación de la segunda hipótesis específica. Además, se demostró que estas estrategias de Neuromarketing mejoraron la cantidad de visitas que corresponde a otro objetivo, en un 46.43%, cuyo valor de P=0,000, menor al nivel de significancia 5%, confirma la prueba de la tercera hipótesis específica.TesisT02317TA 4 S23 201

    Extracts of Pomegranate, Persimmon, Nettle, Dill, Kale and Sideritis Specifically Modulate Gut Microbiota and Local Cytokines Production: in Vivo Study

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    The aim of the work was to use the in vivo model to reveal main changes in gut microbiota of immune competent mice in dynamic and find out the specificity of immunomodulation action (activity) of traditional foods ingredients - edible plants extracts on local mucosal cytokines to its oral administration.Materials and methods. In this study, seven groups of immunocompetent BALB/c mice were formed. All experimental mice had been fed orally by plants' extracts (15mg/200 µl/mouse) for the 14th days. The extracts of edible plants - ingredients of traditional food such as kale leaves, persimmon, pomegranate, dill, Sideritis scardica, and nettle were obtained as described and orally administrated to experimental animals. For microbiological analysis of gut microbiota changes, the colon content has been investigated, the key microbial representatives were isolated by plating of its serial dilution on selected chromogenic medium, identified serologically and biochemically. The production of cytokines in different gut compartments and gut associated lymphoid tissues (GALT) were detected by Enzyme-linked immunosorbent assay (ELISA).Results. In experiments in mice, the ability of Kale, Dill and Sideritis extracts, when administered orally, selectively inhibit the content of E. coli, K. pneumoniae, E. faecalis, L. acidophilus in the colon of mice had been demonstrated, and increasing of B. bifidum had been observed. Nettle extract leads to an increase in E. coli, and persimmon extract - to an increase in levels of E. faecalis, Bifidobacterium and a decrease in the content of Candida spp. Pomegranate extract specifically stimulates the growth of Bifidobacterium. There are sufficient differences in produced cytokines in fragment culture and serum of mice fed with different plants extracts. TNF-a, and IL-2 increased both systemically and locally in the different gut compartments by Dill extract, Nettle and Sideritis extracts only at mucosal sites. IL-2, but also IL-10 and IL-12, IFN-g, and IL-17 but not TNF-a were stimulated in different levels by Pomegranate, Persimmon and Kale extracts: both systemically and locally.Conclusions. No harmful influence of tested plants had been observed. The most beneficial properties are inherent to Persimmon extract and slightly less detected in Pomegranate and Kale extracts. Siderites extract rather show no significant influence on all the studied indices while the Nettle and Dill extracts are acting pro-inflammator

    Calculation and selection of compensation devices reactive power in performance qualification projects

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    Постнікова М. В., Ковальов О. В., Петров В. О. Розрахунок і вибір пристроїв компенсації реактивної потужності при виконанні кваліфікаційних проєктів. Удосконалення освітньо-виховного процесу в закладі вищої освіти : збірник науково-методичних праць ТДАТУ. 2022. Вип. 25. С. 242-247.UA: Запропонована методика розрахунку і вибору пристроїв компенсації реактивної потужності при виконанні кваліфікаційних проєктів. Ця методика дозволяє не тільки економити фінансові засоби, але і передавати більшу кількість активної електричної енергії в мережах. EN: The method of calculation and selection of reactive power compensation devices in the implementation of qualification projects is proposed. This technique allows not only to save not only money, but also to transfer more active electricity in the networks
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