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Almost Everywhere Convergence of Sequences of Cesàro and Riesz Means of Integrable Functions with Respect to the Multidimensional Walsh System

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Acta Mathematica Sinica,English Series 2014年第2期30卷 311-322页

作者： gyrgy gt Institute of Mathematics and Computer Science College of Nyíregyhza

the aim of this paper is to prove the *** of sequences of the Cesaro and Riesz means of the Walsh–Fourier series of d variable integrable *** is,let a=（a1,...,ad）：N→Nd（d∈P）such that aj（n＋1）≥δsupk≤n aj（k）（j=1,...,d,n∈N）for someδ〉0 and a1（＋∞）=···=ad（＋∞）=＋∞.then,for each integrable function f∈L1（Id）,we have the *** for the Cesaro means limn→∞σαa（n）f=f and for the Riesz means limn→∞σα,γa（n）f=f for any 0〈αj≤1≤γj（j=1,...,d）.A straightforward consequence of our result is the so-called cone restricted *** of the multidimensional Cesaro and Riesz means of integrable functions,which was proved earlier by Weisz.

关键词： Walsh system d-dimensional Fejer and Riesz means subsequence almost everywhereconvergence

Pointwise Convergence of Cone-like Restricted two-dimensional Fejér Means of Walsh-Fourier Series

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Acta Mathematica Sinica,English Series 2010年第12期26卷 2295-2304页

作者： gyrgy gt Kroly NAgy Institute of Mathematics and Computer Sciences College of Nyíregyhza

For the two-dimensional Walsh system, gat and Weisz proved the a.e. convergence of Fejer means σnf of integrable functions, where the set of indices is inside a positive cone around the identical function, that is, β^-1≤n1/n2 ≤β is provided with some fixed parameter ~ 〉 1. In this paper we generalize the result of gat and Weisz. We not only generalize this theorem, but give a necessary and sufficient condition for cone-like sets in order to preserve this convergence property.

关键词： Walsh group Walsh system pointwise convergence Fejer means

Mapping the geography of editors-in-chief

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Journal of Data and Information Science 2024年第1期9卷 124-137页

作者： gyorgy Csomos Department of Civil Engineering University of Debrecen4028 DebrecenOtemeto utca.2-4Hungary

Purpose:this study aims to explore the geography of editors-in-chief to demonstrate which countries exercise the highest-level decision-making in scholarly *** addition,the study seeks to investigate the potential relationships between the origin and nationality of academic publishers and the geography of ***/methodology/approach:the analysis involves 11,915 journals listed in Web of Science’s Social Sciences Citation Index(SSCI)and Science Citation Index Expanded(SCIE).these journals employ 15,795 scholars as *** geographical locations of the institutions the editors-in-chief are affiliated with were identified;then,the data were aggregated at the country ***:the results show that most editors-in-chief are located in countries of the Anglosphere,primarily the United States and the United *** addition,most academic publishers and professional organizations that publish academic journals were found to be based in the United States and the United Kingdom,where most editors-in-chief are also *** limitations:the analysis involves journals indexed in the Web of Science’s SCIE/SSCI databases,which are demonstrably biased toward the English ***,the study only takes a snapshot of the geography of editors-in-chief for the year 2022,but it does not investigate *** implications:the study maps the highest-level decision-making in scholarly ***/value:the study explores and maps the geography of editors-in-chief by using a massive dataset.

关键词： Editor-in-chief Highest-level decision-making Academic publisher Web of Science Anglosphere

On the Divergence of N(?)rlund Logarithmic Means of Walsh-Fourier Series

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Acta Mathematica Sinica,English Series 2009年第6期25卷 903-916页

作者： gyrgy gAt Ushangi gOgINAVA Institute of Mathematics and Computer Science College of Nyíregyháza Department of Mechanics and Mathematics Tbilisi State University

It is well known in the literature that the logarithmic means 1/logn ^n-1∑k=1 Sk（f）/k of Walsh or trigonometric Fourier series converge a.e. to the function for each integrable function on the unit interval. this is not the case if we take the partial sums. In this paper we prove that the behavior of the so-called NSrlund logarithmic means 1/logn ^n-1∑k=1 Sk（f）/n-k is closer to the properties of partial sums in this point of view.

关键词： Walsh function Norlund logarithmic means a.e. divergence.

Convergence in L^p-norm of Fourier Series on the Complete Product of Quaternion groups with Bounded Orders

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Acta Mathematica Sinica,English Series 2014年第9期30卷 1566-1578页

作者： gyrgy gAt Rodolfo tOLEDO College of Nyiregyhza Inst.of Math.and Comp.Sci.Nyiregyhza

A well-known result for Vilenkin systems is the fact that for all 1 〈 p 〈 oc the n-th partial sums of Fourier series of all functions in the space Lp converge to the function in LP-norm. this statement can not be generalized to any representative product system on the complete product of finite non-abelian groups, but even then it is true for the complete product of quaternion groups with bounded orders and monomial representative product system ordered in a specific way.

关键词： Fourier analysis Walsh-Paley system representative product systems complete product of quaternion groups convergence in norm

Role of Orvosi Hetilap in the development of Hungarian gastroenterology

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World Journal of gastroenterology 2010年第18期16卷 2317-2320页

作者： gyrgy Miklós Buzás Department of gastroenterology Ferencváros Health Service Non-Profit Ltd.

AIM:to analyze the contribution of Orvosi Hetilap(Hungarian Medical Journal) to the field of ***:All issues of the journal between 1857 and 2008 and identified original articles and reviews dealing with gastroenterology were *** rate of publications,the thematic distribution and foreign sources of knowledge were *** dates that major achievements in gastroenterology were introduced in Hungary were compared to those dates in Western ***:A total of 4799 original/research articles on gastroenterology were published,which represents 11.1% of the total *** rankings showed that liver and biliary diseases represented 20.36% of the total,followed by gastric diseases(9.35%) and surgery(8.77%).A total of 268 foreign journals were reviewed:50.9% were german,30.4% English,12.1% French and only 6.6% were in other *** major achievements of gastroenterology were introduced with varying delays compared to Western ***:Orvosi Hetilap has made a large contribution to the development of Hungarian *** high proportion of gastroenterology studies underlines the importance of digestive diseases in public health.

关键词： Content analysis gastroenterology Hepatology Orvosi Hetilap Scientometrics

Factors Influencing Cities’ Publishing Efficiency

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Journal of Data and Information Science 2018年第3期3卷 43-80页

作者： Csomós györgy Department of Civil Engineering University of Debrecen

Purpose:Recently,a vast number of scientific publications have been produced in cities in emerging *** has long been observed that the publication output of Beijing has exceeded that of any other city in the world,including such leading centres of science as Boston,New York,London,Paris,and *** have suggested that,instead of focusing on cities'total publication output,the quality of the output in terms of the number of highly cited papers should be ***,in the period from 2014 to 2016,Beijing produced as many highly cited papers as Boston,London,or New *** this paper,another method is proposed to measure cities'publishing performance by focusing on cities'publishing efficiency(i.e.,the ratio of highly cited articles to all articles produced in that city).Design/methodology/approach:First,554 cities are ranked based on their publishing efficiency,then some general factors influencing cities'publishing efficiency are *** general factors examined in this paper are as follows:the linguistic environment of cities,cities'economic development level,the location of excellent organisations,cities'international collaboration patterns,and their scientific field ***,the paper examines the fundamental differences between the general factors influencing the publishing efficiency of the top 100 most efficient cities and the bottom 100 least efficient ***:Based on the research results,the conclusion can be drawn that a city's publishing efficiency will be high if meets the following general conditions:it is in a country in the Anglosphere-Core;it is in a high-income country;it is home to top-ranked universities and/or world-renowned research institutions;researchers affiliated with that city most intensely collaborate with researchers affiliated with cities in the United States,germany,England,France,Canada,Australia,and Italy;and the most productive scientific disciplines of highly cited articles are publi

关键词： Cities Publishing efficiency Spatial scientometrics Highly cited articles Web of Science

First-line eradication of Helicobacter pylori:Are the standard triple therapies obsolete? A different perspective

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World Journal of gastroenterology 2010年第31期16卷 3865-3870页

作者： gyrgy Miklós Buzás Department of gastroenterology Fe-rencváros Health Service Non-Profit Ltd.

Studies concerning the eradication of Helicobacter pylori have resulted in a proliferation of meta-analyses. to date, there are 303 meta-analyses cited in PubMed, 113 dealing with the therapy of the infection. A chronological analysis of the results of meta-analyses performed between 1998 and 2010 shows that first-line standard triple therapies achieved eradication rates on an intention-to-treat basis of around 80%; prolonging treatment to 14, but not 10 d should improve the results. the proton pump inhibitors have a similar efficiency, and giving a double dose is more efficient than the standard doses of these drugs. triple and quadruple therapies proved to be equivalent. Based on meta-analytical data, the decrease in efficiency over time cannot be substantiated: eradication rates the introduction of triple therapies. As alternatives, ranitidine bismuth citrate-, levofloxacinor furazolidone-based therapies were shown to obtain the same eradication rates as standard triple regimens. Sequential therapies and quadruple non-bismuth-based therapies were superior to standard triple therapies but their use is limited to certain countries. In the author's opinion, and from a meta-analytical viewpoint, standard triple therapies cannot yet be considered obsolete. Furthermore, noninferiority trials are proposed for the future, including assessment of local contemporary antimicrobial resistance profi les and the CagA and CYP2C19 status of the enrolled patients.

关键词： Antibiotics Eradication Helicobacter pylori Meta-analysis

Metabolic consequences of Helicobacter pylori infection and eradication

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World Journal of gastroenterology 2014年第18期20卷 5226-5234页

作者： gy?rgy Miklós Buzás Department of gastroenterology Ferencváros Health Centre1095 BudapestHungary

Helicobacter pylori(***)is still the most prevalent infection of the *** of the stomach by this agent will invariably induce chronic gastritis which is a low-grade inflammatory state leading to local complications(peptic ulcer,gastric cancer,lymphoma)and remote *** *** does not enter circulation,these extragastric manifestations are probably mediated by the cytokines and acute phase proteins produced by the inflammed *** epidemiologic link between the *** infection and metabolic changes is inconstant and *** delay was described mainly in low-income regions with high prevalence of the infection,where probably other nutritional and social factors contribute to *** timely eradication of the infection will lead to a more healthy development of the young population,along with preventing peptic ulcers and gastric cancer An increase of total,low density lipoprotein and high density liporotein cholesterol levels in some infected people creates an atherogenic lipid profile which could promote atherosclerosis with its complications,myocardial infarction,stroke and peripheral vascular *** designed and adequately powered long-term studies are required to see whether eradication of the infection will prevent these *** case of glucose metabolism,the most consistent association was found between *** and insulin resistance:again,proof that eradication prevents this common metabolic disturbance is *** results of eradication with standard regimens in diabetics are significantly worse than in non-diabetic patients,thus,more active regimens must be found to obtain better *** eradication itself led to an increase of body mass index and cholesterol levels in some populations,while in others no such changes were *** of the metabolic consequences of *** infection must be clarified in the future.

关键词： Diabetes mellitus Cytokines glucose homeostasis growth Helicobacter pylori Interleukins Lipid metabolism Metabolic syndrome