4,566 research outputs found

    The study of initial permeability temperature dependences for LiTiZn ferrite ceramics

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    Results of obtaining and analyzing the temperature dependences of initial permeability of ferrite ceramics are presented in the paper. It was shown that the level of the defective state of ferrite ceramics can be obtained from the value of two parameters [alpha] and [beta] of the phenomenological expression describing the experimental dependences. The results showed that the main criterion of the defect state is the parameter [beta]/[alpha], which is related to the elastic stresses in the material. An indicator of the structure perfection is also the value of the maximum of the initial permeability near the Curie temperature

    Effects of Size Polydispersity on the Extinction Spectra of Colloidal Nanoparticle Aggregates

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    We investigate the effect of particle polydispersity on the optical extinction spectra of colloidal aggregates of spherical metallic (silver) nanoparticles, taking into account the realistic interparticle gaps caused by layers of stabilizing polymer adsorbed on the metal surface (adlayers). The spectra of computer-generated aggregates are computed using two different methods. The coupled-multipole method is used in the quasistatic approximation and the coupled-dipole method beyond the quasistatics. The latter approach is applicable if the interparticle gaps are sufficiently wide relative to the particle radii. Simulations are performed for two different particle size distribution functions (bimodal and Gaussian), varying the number of particles per aggregate, and different distribution functions of the interparticle gap width. The strong influence of the latter factor on the spectra is demonstrated and investigated in detail

    Questions and Situations on the Conjugation of the Eurasian Economic Union and the “Belt and Road” Initiative between China and Russia

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    Implementation and “interconnection” of large-scale supranational projects, such as the EEU and the BRI, require constant analysis of external and internal factors determining its development, immediate reaction and decisionmaking by the most active and large member countries participating in these initiatives — by Russia and China. This paper continues the research series being made by Russian-Chinese team under the guidance of the Counselor to the Russian President, academician of RAS Dr. Glaziev and Executive Dean of Chongyang Institute for Financial Studies at Renmin University of China, Professor Wang Wen. The paper’s purpose is promotion and practical assistance to conjugation between the EEU and the BRI. The methodology having been used in the research combines a wide range of methods: from general scientifi c ones, including a systematic approach to the investigation of conjugation processes, statistical and comparative analyses of the national economies’ achievements, etc., to specialized technique, such as modern tools of scientifi c diplomacy. We made assessment of the current state and identifi cation of key risks and problems of conjugation between the EEU and the BRI, offered recommendations for improving its effi ciency as well as raising quantitative and qualitative indicators of inter-countries interaction. Joint efforts of both sides formed authors’ Glossary which contains the basic terms, eliminating incorrect or false interpretation and deepening understanding of conjugation processes in the space of Eurasia. We reached a conclusion that despite the achievements in political collaboration of the countries, fi nancial and economic cooperation within the EEU and the BRI remains a sector with the greatest potential for development not only because of the bottlenecks’ availability, but also thanks to the opportunities being opened with transition to a new technological and world economic mode. Particular attention is paid to the development of conjugation strategy and joint creation of new world orderon the basis of broad Eurasian integration. The text of the article is presented in a technical translation on the original Russian Chinese report in English

    First Observation of barB0 to D*0 pi+pi+pi-pi- Decays

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    We report on the observation of B0bar -> D*0 pi+ pi+ pi- pi- decays. The branching ratio is (0.30 +/- 0.07 +/- 0.06)%. Interest in this particular mode was sparked by Ligeti, Luke and Wise who propose it as a way to check the validity of factorization tests in B0bar -> D*+ pi+ pi- pi- pi0 decays.Comment: 11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, Version to appear in Phys. Rev.

    Rate Measurement of D0K+ππ0D^{0}\to K^{+}\pi^{-}\pi^{0} and Constraints on D0D0D^{0} - \overline{D^{0}} Mixing

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    We present an observation and rate measurement of the decay D0 -> K+pi-pi0 produced in 9/fb of e+e- collisions near the Upsilon(4S) resonance. The signal is inconsistent with an upward fluctuation of the background by 4.9 standard deviations. We measured the rate of D0 -> K+pi-pi0 normalized to the rate of D0bar -> K+pi-pi0 to be 0.0043 +0.0011 -0.0010 (stat) +/- 0.0007 (syst). This decay can be produced by doubly-Cabibbo-suppressed decays or by the D0 evolving into a D0bar through mixing, followed by a Cabibbo-favored decay to K+pi-pi0. We also found the CP asymmetry A=(8 +25 -22)% to be consistent with zero.Comment: 10 pages postscript, also available through http://w4.lns.cornell.edu/public/CLN

    Bounds on the CP Asymmetry in Like-Sign Dileptons from B0Bˉ0B^{0}\bar{B}^{0} Meson Decays

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    We have measured the charge asymmetry in like-sign dilepton yields from B^0 B^0-bar meson decays using the CLEO detector at the Cornell Electron Storage Ring. We find a_ll = [N(l+l+) - N(l-l-)]/[N(l+l+) + N[l-l-)] = +0.013 +/- 0.050 +/- 0.005 . We combine this result with a previous, independent measurement and obtain Re(epsilon_B)/(1+|epsilon_B|^2) = +0.0035 +/- 0.0103 +/- 0.0015 (uncertainties are statistical and systematic, respectively) for the CP impurity parameter, epsilon_B.Comment: 11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLN

    Hadronic Mass Moments in Inclusive Semileptonic B Meson Decays

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    We have measured the first and second moments of the hadronic mass-squared distribution in B -> X_c l nu, for P(lepton) > 1.5 GeV/c. We find <M_X^2 - M_D[Bar]^2> = 0.251 +- 0.066 GeV^2, )^2 > = 0.576 +- 0.170 GeV^4, where M_D[Bar] is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b -> s gamma, we find the HQET parameter lambda_1 (MS[Bar], to order 1/M^3 and beta_0 alpha_s^2) to be -0.24 +- 0.11 GeV^2. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain |V_cb| = 0.0404 +- 0.0013.Comment: 11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PR

    A Search for Charmless BVVB\to VV Decays

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    We have studied two-body charmless decays of the BB meson into the final states ρ0ρ0\rho^0 \rho^0, K0ρ0K^{*0} \rho^0, K0K0K^{*0} K^{*0}, K0K0ˉK^{*0} \bar{K^{*0}}, K+ρ0K^{*+} \rho^0, K+K0ˉK^{*+} \bar{K^{*0}}, and K+KK^{*+} K^{*-} using only decay modes with charged daughter particles. Using 9.7 million BBˉB \bar{B} pairs collected with the CLEO detector, we place 90% confidence level upper limits on the branching fractions, (0.467.0)×105(0.46-7.0)\times 10^{-5}, depending on final state and polarization.Comment: 8 pages postscript, also available through http://w4.lns.cornell.edu/public/CLN
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