3,797 research outputs found
Practical Trade-Offs in Integrity Protection for Binaries via Ethereum
Ensuring the integrity of executable binaries is of vital importance to systems that run and depend on them.
Additionally, supply-chain attacks and security related bugs demonstrate that binaries, once deployed, may need to be revoked and replaced with updated versions.
Recently, blockchain ecosystems have garnered broad attention as middlewares for decentralised solutions to existing problems.
Stengele et al. presented a concept how the Ethereum blockchain and peer-to-peer network can be used to ensure the integrity of binaries with timely, accurate, and machine-readable revocations.
In this work, we show this concept in practice with a user client implementation in Go and demonstrate how revocations and updates can reliably reach a user client within minutes.
We show the client\u27s ability to ensure the integrity of multiple binaries and continuously monitor the Ethereum blockchain for updates and revocations via an unmodified Ethereum client.
We also examine the trust relations and trade-offs through our use case.
Since the user client fully relies on an Ethereum client as a gateway, the latter\u27s resilience against malicious actors is crucial to consider in a practical deployment
Effective attraction between oscillating electrons in a plasmoid via acoustic waves exchange
We consider the effective interaction between electrons due to the exchange
of virtual acoustic waves in a low temperature plasma. Electrons are supposed
to participate in rapid radial oscillations forming a spherically symmetric
plasma structure. We show that under certain conditions this effective
interaction can result in the attraction between oscillating electrons and can
be important for the dynamics of a plasmoid. Some possible applications of the
obtained results to the theory of natural long-lived plasma structures are also
discussed.Comment: 14 pages in LaTeX2e, two columns, 3 eps figures; minimal changes,
some typos are corrected; version published on-line in Proc. R. Soc.
Structure, optical, electrical and thermoelectric properties of solution-processed Li-doped NiO films grown by SILAR
The article presents a new facial synthesis of Li-doped NiO films (NiO:Li) via an easy and cost-effective method Successive Ionic Layer Adsorption and Reaction (SILAR) with the processing of the obtained NiO films in a
lithium-containing aqueous solution for their transformation after annealing into NiO:Li layers. Comparative analysis of crystal structure, optical, electrical and thermoelectric properties of the obtained NiO and NiO:Li 420-1050 nm thick films have reveiled a cubic rock-salt NiO structure, at that, NiO:Li samples are nanocrystalline single phased Li-NiO solid solutions. The fabricated NiO and NiO:Li films are p-type semiconductors with activation energy Ea = 0.1 eV and Ea = 0.25‒0.31 eV, respectively. The obtained in-plane Seebeck coefficients Z are in the range 0.20–0.33 mV/К. Notwithstanding the fact that the maximum values of the thermoelectric power factors P=2.2 μW/K2·m, are rather small, they were achieved if the hot end of the NiO:Li film was heated only to 115 °C. Thus, the produced in this work new low cost thermoelectric thin film material is suitable for a production of electrical energy for low-power devices due to absorption of low-potential heat
New exactly solvable systems with Fock symmetry
New superintegrable systems are presented which, like the Hydrogen atom,
possess a dynamical symmetry w.r.t. algebra o(4). One of them simulates a
neutral fermion with non-trivial dipole moment, interacting with the external
e.m. field. This system is presented in both non-relativistic and relativistic
formulations. Another recently discovered system (see arXiv:1208.2886v1) is
non-relativistic and includes the minimal and spin-orbit interaction with the
external electric field. It is shown that all the considered systems are shape
invariant. Applying this quality, these systems are integrated using the tools
of SUSY quantum mechanics.Comment: Section 6 and some new references are adde
Estimate or the effectiveness of intelligent information system of early diagnosis and prognosis of cardiovascular disease
This article describes a new approach to the implementation of the training program of risk probability of coronary heart disease (CHD) remote evaluation. It describes an example of training sample formation based on the statistical analysis of medical data. The proposed solution will allow medical personnel to carry out the personification of cardiac services and first of all, preventive orientation. Also a method for assessing the effectiveness of the program of expert system "ARM-Cardiologist" on the results of ongoing clinical trials is providedyesБелгородский государственный университе
Mutagenic analysis of Potato Virus X movement protein (TGBp1) and the coat protein (CP): in vitro TGBp1–CP binding and viral RNA translation activation
Coherent Excitation of a Two-Level Atom driven by a far off-resonant Classical Field: Analytical Solutions
We present an analytical treatment of coherent excitation of a Two-Level Atom
driven by a far-off resonant classical field. A class of pulse envelope is
obtained for which this problem is exactly solvable. The solutions are given in
terms of Heun function which is a generalization of the Hypergeometric
function. The degeneracy of Heun to Hypergeometric equation can give all the
exactly solvable pulse shapes of Gauss Hypergeometric form, from the
generalized pulse shape obtained here. We discuss the application of the
results obtained to the generation of XUV.Comment: 9 Pages, 8 Figures. Accepted for Physical Review A as a regular
articl
Bosonic String Quantization in Static Gauge
The bosonic string in D dimensional Minkowski space-time is quantized in
static gauge. It is shown that the system can be described by D-1 massless free
fields constrained on the surface L_m = 0, for m \neq 0, where L_m are the
generators of conformal transformations. The free fields are quantized and the
physical states are selected by the conditions L_m|phys>=0, for m>0. The
Poincar\'e group generators on the physical Hilbert space are constructed and
the critical dimension D=26 is recovered from the commutation relations of the
boost operators. The equivalence with the covariant quantization is
established. A possible generalization to the AdS string dynamics is discussed.Comment: 10 page
Data-driven efficient score tests for deconvolution problems
We consider testing statistical hypotheses about densities of signals in
deconvolution models. A new approach to this problem is proposed. We
constructed score tests for the deconvolution with the known noise density and
efficient score tests for the case of unknown density. The tests are
incorporated with model selection rules to choose reasonable model dimensions
automatically by the data. Consistency of the tests is proved
Gradual pressure-induced enhancement of magnon excitations in CeCoSi
CeCoSi is an intermetallic antiferromagnet with a very unusual temperature-pressure phase diagram: at ambient pressure it orders below TN = 8.8 K, while application of hydrostatic pressure induces a new magnetically ordered phase with exceptionally high transition temperature of ∼40 K at 1.5 GPa. We studied the magnetic properties and the pressure-induced magnetic phase of CeCoSi by means of elastic and inelastic neutron scattering (INS) and heat capacity measurements. At ambient pressure CeCoSi orders into a simple commensurate AFM structure with a reduced ordered moment of only mCe = 0.37(6)μB. Specific heat and low-energy INS indicate a significant gap in the low-energy magnon excitation spectrum in the antiferromagnetic phase, with the CEF excitations located above 10 meV. Hydrostatic pressure gradually shifts the energy of the magnon band towards higher energies and the temperature dependence of the magnons measured at 1.5 GPa is consistent with the phase diagram. Moreover, the CEF excitations are also drastically modified under pressure.Fil: Nikitin, S. E.. Max Planck Institute for Chemical Physics of Solids; Alemania. Technische Universität Dresden; AlemaniaFil: Franco, Diego Gaspar. Max Planck Institute for Chemical Physics of Solids; Alemania. Comisión Nacional de Energía Atómica. Gerencia del Área de Energía Nuclear. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro | Universidad Nacional de Cuyo. Instituto Balseiro. Archivo Histórico del Centro Atómico Bariloche e Instituto Balseiro; Argentina. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; ArgentinaFil: Kwon, J.. Max Planck Institute for Chemical Physics of Solids; AlemaniaFil: Bewley, R.. Harwell Campus. STFC Rutherford Appleton Laboratory. ISIS Facility; Reino UnidoFil: Podlesnyak, Andrey. Oak Ridge National Laboratory. Neutron Scattering Division; Estados UnidosFil: Hoser, A.. Helmholtz-Zentrum Berlin für Materialien und Energie; AlemaniaFil: Koza, M. M.. Institute Laue Langevin; FranciaFil: Geibel, C.. Max Planck Institute for Chemical Physics of Solids; AlemaniaFil: Stockert, O.. Max Planck Institute for Chemical Physics of Solids; Alemani
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