2,412 research outputs found
S. Pappas. Le Directoire et les Grecs. (Extrait de la Revue de la France moderne)
No full textBénay S. S. Pappas. Le Directoire et les Grecs. (Extrait de la Revue de la France moderne). In: Échos d'Orient, tome 3, n°6, 1900. p. 380
Groupes -divisibles avec condition de Pappas-Rapoport et invariants de Hasse
No full textWe study -divisible groups endowed with an action of the ring of
integers of a finite (possibly ramified) extension of over a
scheme of characteristic . We suppose moreover that the -divisible group
satisfies the Pappas-Rapoport condition for a certain datum ; this
condition consists in a filtration on the sheaf of differentials
satisfying certain properties. Over a perfect field, we define the Hodge and
Newton polygons for such -divisible groups, normalized with the action. We
show that the Newton polygon lies above the Hodge polygon, itself lying above a
certain polygon depending on the datum . We then construct Hasse
invariants for such -divisible groups over an arbitrary base scheme of
characteristic . We prove that the total Hasse invariant is non-zero if and
only if the -divisible group is -ordinary, i.e. if its Newton polygon
is minimal. Finally, we study the properties of -ordinary -divisible
groups. The construction of the Hasse invariants can in particular be applied
to special fibers of PEL Shimura varieties models as constructed by Pappas and
Rapoport
qPCR como ferramenta de monitoramento de sementes de feijão (Phaseolus vulgaris L.) em diferentes fases de envelhecimento.
No full textNa publicação: Marília C. R. Pappas
Banco de DNA de plantas da Embrapa Recursos Genéticos e Biotecnologia: conservação de material genético e documentação.
No full textEdição especial com os Anais do V Congresso Brasileiro de Recursos Genéticos. Na publicação: Gláucia Buso, Vânia C. R. de Azevedo, Marília C. R. Pappas
Plaque of St. Nicholas Greek Orthodox Church
No full textPlaque with the names of the Building Committee of 1924, inscribed "St. Nicholas Greek Orthodox Church erected 1924. Building Committee A.A. Adams, E.N. Plates, A.P. Argyris, W.S. Maskaleris, Gus D. Pappas, Reverend George Spyridakis, pastor.
Sur une petite levrette blanche : lettres inédites de D'Alembert et de Julie de Lespinasse à Louis Dutens, présentées
No full textJohn P appas : A little white female whippet. Unpublished letters of D'Alembert and Mlle de Lespinasse to Louis Dutens.
This article presents ten unpublished letters, discovered in the archives of Coutts in London, to L. Dutens, a French Protestant in England. As chargé d'affairs in Turin he had met Lagrange who introduced him to D'Alembert ; hence the references to Italian savants and to Lagrange, now in Frederick II' s court on D'Alembert' s recommendation. Much of the correspondence in 1766-68 deals with Mlle de Lespinasse's request for a white female whippet and how it is to be delivered ; the one letter by MUe de Lespinasse thanks him for his guidebook to Europe (1775). There are also references to the Rousseau-Hume quarrel and the Jesuits in England. Despite Dutens' s anti-Voltairian Le Tocsin (1769) D'Alembert remained on good terms with him, no doubt in part because he obtained a pension for Diderot in 1774.Pappas John. Sur une petite levrette blanche : lettres inédites de D'Alembert et de Julie de Lespinasse à Louis Dutens, présentées. In: Dix-huitième Siècle, n°26, 1994. Economie et politique. pp. 227-237
Heteroatom doped-carbon nanospheres as anodes in lithium ion batteries
No full textLong cycle performance is a crucial requirement in energy storage devices. New formulations and/or improvement of “conventional” materials have been investigated in order to achieve this target. Here we explore the performance of a novel type of carbon nanospheres (CNSs) with three heteroatom co-doped (nitrogen, phosphorous and sulfur) and high specific surface area as anode materials for lithium ion batteries. The CNSs were obtained from carbonization of highly-crosslinked organo (phosphazene) nanospheres (OPZs) of 300 nm diameter. The OPZs were synthesized via a single and facile step of polycondensation reaction between hexachlorocyclotriphosphazene (HCCP) and 4,4′-sulphonyldiphenol (BPS). The X-ray Photoelectron Spectroscopy (XPS) analysis showed a high heteroatom-doping content in the structure of CNSs while the textural evaluation from the N2 sorption isotherms revealed the presence of micro- and mesopores and a high specific surface area of 875 m2/g. The CNSs anode showed remarkable stability and coulombic efficiency in a long charge–discharge cycling up to 1000 cycles at 1C rate, delivering about 130 mA·h·g−1. This study represents a step toward smart engineering of inexpensive materials with practical applications for energy devices
A new method to constrain neutron star structure from quasi-periodic oscillations
No full textWe develop a new method to measure neutron star (NS) parameters and derive constraints on the equation of state (EoS) of dense matter by fitting the frequencies of simultaneous quasi-periodic oscillation (QPO) modes observed in the X-ray flux of accreting NSs in low-mass X-ray binaries. To this aim, we calculate the fundamental frequencies of geodesic motion around rotating NSs based on an accurate general-relativistic approximation for their external spacetime. Once the fundamental frequencies are related to the observed frequencies through a QPO model, they can be fit to the data to obtain estimates of the three parameters describing the spacetime, namely the NS mass, angular momentum and quadrupole moment. From these parameters we derive information on the NS structure and EoS. We present a proof of principle of our method applied to pairs of kHz QPO frequencies observed from three systems (4U1608-52, 4U0614+09, and 4U1728-34). We identify the kHz QPOs with the azimuthal and the periastron precession frequencies of matter orbiting the NS, and via our Bayesian inference technique we derive constraints on the neutrons stars' masses and radii. This method is applicable to other geodesic-frequency-based QPO models
Secure Communications for the Two-user Broadcast Channel with Random Traffic
No full textIn this work, we study the stability region of the two-user broadcast channel (BC) with bursty data arrivals and security constraints. It is assumed that one of the receivers has a secrecy constraint, i.e., its packets need to be kept secret from the other receiver, which is defined based on SINR. The receiver with secrecy constraint has full-duplex capability to send a jamming signal for improving its service rate. The stability region of the two-user BC with secrecy constraint is characterized for the general decoding case. Then, assuming two different decoding schemes the respective stability regions are derived. The fullduplex operation of receiver results in self-interference, and the effect of imperfect self-interference cancelation on the stability region is also investigated. The stability region of the BC with a secrecy constraint, where the receivers do not have full duplex capability can be obtained as a special case of the results derived in this paper. In addition, the paper considers the problem of maximizing the saturated throughput of the queue for which there is no secrecy constraint under minimum service guarantees for the other queue. The results provide new insights on the effect of the secrecy constraint on the stability region of the BC. It is found that the stability region with secrecy constraint is sensitive to the degree of self-interference cancelation.Funding agencies: National Research Foundation of Korea, Korea Government (MSIP) [2017R1C1B2009280]; DGIST Research and Development Program of the Ministry of Science and ICT [17-ST-02]; DGIST Research and Development Program of the Ministry of Science and ICT under ELLIIT</p
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