Results 131 to 140 of about 4,759 (244)
Coherent Forecasting of Realized Volatility
Journal of Forecasting, Volume 45, Issue 4, Page 1714-1729, July 2026.ABSTRACT The QLIKE loss function is the stylized favorite of the literature on volatility forecasting when it comes to out‐of‐sample evaluation and the state of the art model for realized volatility (RV) forecasting is the HAR model, which minimizes the squared error loss for in‐sample estimation of the parameters.
Marius Puke, Karsten Schweikert
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Polymer Composites, Volume 47, Issue S2, Page S85-S95, 20 June 2026.Acquisition, filtering and modeling by genetic programming (tree pattern) of the acoustic signal for fiber‐filled composites. ABSTRACT This study experimentally investigated the discrete phase contributions of fibers and entrapped air on the attenuation spectrum of a fiber‐filled thermoplastic composite and derives a mathematical expression for sound ...
Austin D. Bedrosian +3 more
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Advanced Optical Materials, Volume 14, Issue 23, 19 June 2026.This work studies the effect of halide alloying in Cs3Bi2(Br1−xIx)9 (0 ≤ x ≤ 1) semiconductors. The x = 0.6 shows the smallest bandgap, lowest exciton binding energy, and longest charge carrier lifetimes, showing promising properties for optoelectronic and photocatalytic applications.
He Zhao, Eline M. Hutter
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On the Meaning of Localization in Non‐Local Quantum Field Theory
Annalen der Physik, Volume 538, Issue 6, June 2026.In non‐local quantum field theory nature does not necessarily allow objects or events to be localized to exact mathematical points. Instead any physical measurement has a built‐in finite resolution set by the non‐locality scale. Spacetime remains continuous and Lorentz‐covariant, but below this scale pointlike localization becomes an idealization ...
E. J. Thompson
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Quartic Loss Function and Its Application to the Parameter Design Problem
, 2003 There are two functional forms that are commonly used to represent a quality loss function. One form is the conventional step function that is based on classifying the units as defective and non-defective, and the other form is the quadratic loss ...
Poonthanomsook, Chanwut
core
Quartic Functions for Time-Frequency Analysis with Applications to Signal Adaptive Kernel Design
, 1997 In time-frequency analysis, we extend functions of one variable to functions of two variables. The functions of two variables provide information about the signal that is not easily discernible from the functions of one variable.
Jeffrey C. O'neill +1 more
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Water Cationic Composition on Potassium Displacement in Tropical Soils
CLEAN – Soil, Air, Water, Volume 54, Issue 6, June 2026.ABSTRACT This study aimed to evaluate the interplay between water hardness, sodium adsorption ratio (SAR), and electrical conductivity (EC); with tropical soil physical, chemical, and mineralogical characteristics on the displacement K+. The water quality treatments represented solutions suitable and not suitable for irrigation, with varying levels of ...
Miguel Angel Corea Alvarez +8 more
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Giant vortices in combined harmonic and quartic traps
, 2004 We consider a rotating Bose-Einstein condensate confined in combined harmonic and quartic traps, following recent experiments [V. Bretin, S. Stock, Y. Seurin and J. Dalibard, cond-mat/0307464]. We investigate numerically the behavior of the wave function
Aftalion, Amandine, Danaila, Ionut
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Ecology and Evolution, Volume 16, Issue 6, June 2026.We used 27 years of data from an insectivorous passerine in southeastern Australia, the superb fairy‐wren Malurus cyaneus, to assess how climate variation influences vegetation productivity and, indirectly, reproduction and survival via potential trophic interactions.
Richard S. Turner +6 more
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Quartic spline-on-spline interpolation
, 1996 This paper provides a class of quartic spline-on-spline interpolation S[k](x) on the function f(x), k = 0(1)4. Under the end conditions selected appropriately, we show that when the knots are equally spaced, with spacing h, then the order of accuracy of ...
Shi-Shu,, Kaixin-Fu,, Xieping-Gao,
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