Results 1 to 10 of about 4,401,389 (217)

Current mean values in the XYZ model

open access: yesSciPost Physics, 2023
The XYZ model is an integrable spin chain which has an infinite set of conserved charges, but it lacks a global $U(1)$-symmetry. We consider the current operators, which describe the flow of the conserved quantities in this model.
Levente Pristyák, Balázs Pozsgay
doaj   +1 more source

Detection of mean reversion point based on quantiles of extreme value distribution: evidences from Iran and international markets [PDF]

open access: yesتصمیم گیری و تحقیق در عملیات, 2021
Purpose: Deciding on the existence of the mean reversion property in financial data has attracted the attention of many researchers, and different tests have been proposed to evaluate the presence of this feature in the data.
Hossein Mohajer, Afshin Fayyaz Movaghar
doaj   +1 more source

The Mean Values of Character Sums and Their Applications

open access: yesMathematics, 2021
In this paper, we use the elementary methods and properties of classical Gauss sums to study the calculation problems of some mean values of character sums of special polynomials, and obtained several interesting calculation formulae for them.
Jiafan Zhang, Yuanyuan Meng
doaj   +1 more source

Statistical analysis of extreme value of meteorological elements observed for the last 31 years (1989–2019) at Narora site

open access: yesRadiation Protection and Environment, 2021
Understanding of extreme weather conditions at the site of interest is essentially required in the design of engineering structures so that the structures can withstand weather stresses. This paper presents an analysis of extreme values of meteorological
Deepak Kumar   +5 more
doaj   +1 more source

One Kind Special Gauss Sums and their Mean Square Values

open access: yesJournal of Mathematics, 2021
In this paper, we introduce one kind special Gauss sums; then, using the elementary and analytic methods to study the mean value properties of these kind sums, we obtain several exact calculating formulae for them.
Jianhong Zhao, Jiejie Gao
doaj   +1 more source

Effects of Different Contact Lens Designs on Visual Quality Among the Soft Spherical Contact Lens Users

open access: yesTürk Oftalmoloji Dergisi, 2013
Purpose: To evaluate the effects of different lens designs on visual quality among soft spherical contact lens users. Material and Method: Forty eyes of twenty patients from our contact lens unit were included in this study.
Mustafa Demir   +2 more
doaj   +1 more source

MEAN VALUES FOR HOMOGENEOUS STIT TESSELLATIONS IN 3D

open access: yesImage Analysis and Stereology, 2011
Recently (Nagel and Weiss, 2005), the class of homogeneous random tessellations that are stable under the operation of iteration (STIT) was introduced. In the present paper this model is reviewed and new results for the mean values of essential geometric
Werner Nagel, Viola Weiss
doaj   +1 more source

Analyzing differences between restricted mean survival time curves using pseudo-values

open access: yesBMC Medical Research Methodology, 2022
Hazard ratios are ubiquitously used in time to event analysis to quantify treatment effects. Although hazard ratios are invaluable for hypothesis testing, other measures of association, both relative and absolute, may be used to fully elucidate study ...
Federico Ambrogi   +2 more
doaj   +1 more source

Evaluation of mean gray values of a cat with chronic renal failure: case report [PDF]

open access: yesArquivo Brasileiro de Medicina Veterinária e Zootecnia, 2021
In this case, a 12-year-old female domestic cat with chronic renal failure (CRF), which had lived longer than the mean survival time for cats with that condition, was monitored to evaluate the effects of treatment and mean gray value (MGV) changes.
H.H. Arslan, U. Ozcan, Y. Durmus
doaj   +1 more source

NEW MEAN VALUES FOR HOMOGENEOUS SPATIAL TESSELLATIONS THAT ARE STABLE UNDER ITERATION

open access: yesImage Analysis and Stereology, 2010
Homogeneous random tessellations in the 3-dimensional Euclidean space are considered that are stable under iteration – STIT tessellations. A classification of vertices, segments and flats is introduced and a couple of new metric and topological mean ...
Christoph Thäle, Viola Weiss
doaj   +1 more source

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