نتایج جستجو برای: variable cross

تعداد نتایج: 735960  

2011
Thomas A. Manz

We show that developing a Theory of Everything (TOE) to unify all physical interactions requires a spacetime model having: (i) a discrete-continuous dual structure in which physical properties that could hypothetically vary continuously in some abstract sense are discretized upon measurement and (ii) a variable connectivity dimensionality field. Because this type of space transcends variable-ba...

2009
Ivana HRISTOVA

Exclusive electroproduction of π + mesons was studied by scattering 27.6 GeV positrons or electrons off a gaseous hydrogen target. The spin-averaged cross section and the single-spin azimuthal asymmetry with respect to transverse target polarisation were measured as a function of the Man-delstam variable t, the Bjorken scaling variable x B , and the virtuality Q 2 of the exchanged photon. The r...

Journal: :iranian journal of public health 0
h.ladonni m. baniardalani s.r. nadaf dezfulli

the genetics and mechanism of malathion resistance in the adults of an. stephensi (ban-s), was studied. nine successive generations of malathion selection in the adults resulted in an increase in ltso of about 3-fold. the crossing experiments indicated that the resistance is inherited as partially dominant character with no indication of sex linkage. the results of back-crosses suggested that p...

Journal: :Journal of pediatric psychology 2014
Kristoffer S Berlin Natalie A Williams Gilbert R Parra

OBJECTIVE Pediatric psychologists are often interested in finding patterns in heterogeneous cross-sectional data. Latent variable mixture modeling is an emerging person-centered statistical approach that models heterogeneity by classifying individuals into unobserved groupings (latent classes) with similar (more homogenous) patterns. The purpose of this article is to offer a nontechnical introd...

Journal: :international journal of data envelopment analysis 2015
sh. banihashemi m. sanei

the present study is an attempt toward evaluating the performance of portfolios and asset selectionusing cross-efficiency evaluation. cross-efficiency evaluation is an effective way of ranking decisionmaking units (dmus) in data envelopment analysis (dea). conventional dea models assume nonnegativevalues for inputs and outputs. however, we know that unlike return and skewness, varianceis the on...

2005
Karl F. Doerner Richard F. Hartl Martin W. P. Savelsbergh

We introduce a real-life problem faced by the blood bank of the Austrian Red Cross for Eastern Austria: how to cost-effectively organize the periodic delivery of blood products to Austrian hospitals. We present various solution approaches, based on integer programming and variable neighborhood search, and empirically evaluate their performance. Moreover, we study the potential value of switchin...

2007
Xueming Luo

Prior research has largely focused on the positive side of customer experience, such as satisfaction. In contrast, this study investigates the negative side of customer experience and tests the harmful impact of consumer negative voice on firms’ stock returns. Based on a longitudinal real-world data set that matches consumer negative voice (complaint records) in the airline industry with firm s...

2004
Joachim Wagner

Using quantile regression and a rich cross section data set for German manufacturing plants this paper documents that the impact of plant characteristics on export activities varies along the conditional size distribution of the export/sales ratio. For example, firm size is statistically significant at a conventional level for the 0.25 quantile only; branch plant status matters at the upper tai...

2012
Jon Claerbout Qiang Fu Antoine Guitton

Because predictive decon fails on the Ricker wavelet, earlier we devised an extension to non-minimum phase wavelets (Yang et al, 2011). It showed remarkable clarity of seismogram polarity. Here we improve our method by a log spectral parameterization. Another innovation here is correctly handling time-variable gain. Since filtering does not commute with TV gain, gain is now done after decon (no...

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