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81.
Langaro E. A. Costa de Moraes M. Buth I. S. Angulski da Luz C. Pereira Filho J. I. Matoski A. 《Journal of Thermal Analysis and Calorimetry》2020,142(3):1223-1231
Journal of Thermal Analysis and Calorimetry - Alkali-activated cements are low-environmental-impact binders and can be obtained from the alkaline activation of wastes such as slags and fly ashes,... 相似文献
82.
In this paper, we are interested in evaluating the resilience of financial portfolios under extreme economic conditions. Therefore, we use empirical measures to characterize the transmission process of macroeconomic shocks to risk parameters. We propose the use of an extensive family of models, called General Transfer Function Models, which condense well the characteristics of the transmission described by the impact measures. The procedure for estimating the parameters of these models is described employing the Bayesian approach and using the prior information provided by the impact measures. In addition, we illustrate the use of the estimated models from the credit risk data of a portfolio. 相似文献
83.
J. H. de Araújo J. B. M. da Cunha A. Vasquez L. Amaral J. T. Moro F. C. Montenegro S. M. Rezende M. D. Coutinho Filho 《Hyperfine Interactions》1991,67(1-4):507-511
57Fe Mössbauer effect measurements in the diluted Ising antiferromagnet Fe x Zn1?x F2 withx=0.25 andx=0.57 at temperatures between 4.2 and 55 K, are reported. DC suceptibility measurements show a spin-glass (SG) phase at low temperatures forx≤0.31. Our Mössbauer spectra show a phase transition to a SG state with antiferromagnetic order (AFSG) forx=0.25 and only antiferromagnetic order forx=0.57. 相似文献
84.
The field dependence of the magnetic susceptibility of powdered NiBr2 6NH3 and NiCl2 6NH3 was measured up to 75 koe at temperatures above and below TN. The anomalies found are discussed in terms of other magnetic data known for these salts. 相似文献
85.
In this work we study the asymptotic behavior of viscous incompressible 2D flow in the exterior of a small material obstacle. We fix the initial vorticity ω0 and the circulation γ of the initial flow around the obstacle. We prove that, if γ is sufficiently small, the limit flow satisfies the full-plane Navier–Stokes system, with initial vorticity ω0 + γδ, where δ is the standard Dirac measure. The result should be contrasted with the corresponding inviscid result obtained by the authors in Iftimie et al. (Comm. Part. Differ. Eqn. 28, 349–379 (2003)), where the effect of the small obstacle appears in the coefficients of the PDE and not only in the initial data. The main ingredients of the proof are L
p
− L
q
estimates for the Stokes operator in an exterior domain, a priori estimates inspired on Kato’s fixed point method, energy estimates, renormalization and interpolation. 相似文献
86.
Alves GA Amato S Anjos JC Appel JA Astorga J Bracker SB Cremaldi LM Dagenhart WD Darling CL Dixon RL Errede D Fenker HC Gay C Green DR Jedicke R Karchin PE Kennedy C Kwan S Lueking LH de Mello Neto JR Metheny J Milburn RH de Miranda JM da Motta Filho H Napier A Passmore D Rafatian A dos Reis AC Ross WR Santoro AF Sheaff M Souza MH Spalding WJ Stoughton C Streetman ME Summers DJ Takach SF Wallace A Wu Z 《Physical review letters》1996,77(12):2388-2391
87.
88.
Condeixa Lucas Dias Silva Pierry Moah Diego Farias Brenda Leiras Adriana 《Central European Journal of Operations Research》2022,30(3):921-940
Central European Journal of Operations Research - Societal awareness and legislation changes concerning sustainability have affected how organizations generate value for stakeholders, as well as... 相似文献
89.
90.
K. Bescherer J. A. Barnes S. Dias G. Gagliardi H.-P. Loock N. R. Trefiak H. Waechter S. Yam 《Applied physics. B, Lasers and optics》2009,96(1):193-200
Multi-exponential decay waveforms are common occurrences in cavity ring-down spectroscopy and the respective ring-down times
are typically obtained by fitting the ring-down waveform to the sum of exponential decay functions. In phase-shift cavity
ring-down (CRD) spectroscopy the measurement of a single phase angle will not provide sufficient information and needs to
be complemented by either intensity measurements or phase angle measurements at different modulation frequencies. Here, a
formalism analogous to that developed for fluorescence lifetime spectroscopy is adapted to the phase-shift CRD technique and
is tested for two types of waveguide CRD systems: (1) a single-mode fiber cavity in which light is confined by two identical
Fiber Bragg Gratings and (2) a multimode fiber loop. By measuring the phase angle at different modulation frequencies, lifetimes
for up to three different decay processes were obtained. 相似文献