Hasil untuk "Periodicals"

F. Haber, J. Weiss

Zeshui Xu, Qingli Da

In this work, we first make a survey of the existing main aggregation operators and then propose some new aggregation operators such as the induced ordered weighted geometric averaging (IOWGA) operator, generalized induced ordered weighted averaging (GIOWA) operator, hybrid weighted averaging (HWA) operator, etc., and study their desirable properties. Finally, we briefly classify all of these aggregation operators. © 2003 Wiley Periodicals, Inc.

E. Tabak, C. Turner

A new methodology for density estimation is proposed. The methodology, which builds on the one developed by Tabak and Vanden‐Eijnden, normalizes the data points through the composition of simple maps. The parameters of each map are determined through the maximization of a local quadratic approximation to the log‐likelihood. Various candidates for the elementary maps of each step are proposed; criteria for choosing one includes robustness, computational simplicity, and good behavior in high‐dimensional settings. A good choice is that of localized radial expansions, which depend on a single parameter: all the complexity of arbitrary, possibly convoluted probability densities can be built through the composition of such simple maps. © 2012 Wiley Periodicals, Inc.

M. Brackett, R. Palomera, Justyna Mojsa-Kaja et al.

David Futer

This paper proves that every periodic automorphism of a closed hyperbolic surface S sends some curve to a nearly disjoint curve. In particular, periodic maps cannot have the property that every curve fills with its image, so no such map can give a positive answer to a question of Wright. This paper also answers a question of Schleimer about irreducible periodic surface maps.

Yiping Liu, Yifan Jiang, Jingyi Wang et al.

ObjectiveOrthostatic hypotension (OH) and cognitive impairment are prevalent non-motor symptoms in Parkinson’s disease (PD). Although numerous epidemiological studies have explored the association between OH and cognitive impairment, the findings remain controversial. This study aims to systematically evaluate the relationship between OH and cognitive function in patients with PD and to investigate the impact of OH on different cognitive domains.MethodsDatabases, including the Chinese National Knowledge Infrastructure (CNKI), Wanfang Database, SinoMed, VIP (Database of Chinese Scientific and Technical Periodicals), PubMed, Embase, Cochrane Library, Web of Science, ProQuest, Scopus, and Ovid, were searched for eligible publications from their inception to July 2025. After literature screening and quality evaluation based on inclusion and exclusion criteria, meta-analysis, heterogeneity testing, sensitivity analysis, and subgroup analysis were conducted using Review Manager 5.4 software. Publication bias analysis was assessed using Stata software.ResultsThirteen studies with a total of 1,417 participants were ultimately included, comprising 552 Parkinson’s patients with OH (PD-OH group) and 865 Parkinson’s patients without OH (PD-NOH group). Compared to the PD-NOH group, the global cognitive score of the PD-OH group was significantly lower [SMD = −0.62, 95%CI [−0.78, −0.46], p < 0.01]. In terms of cognitive domains, the PD-OH group showed the following results: memory: SMD = −0.12, 95% CI (−0.64, 0.17), p = 0.25; executive function: SMD = −0.29, 95% CI (−0.50, −0.07), p < 0.01; verbal ability: SMD = −0.35, 95% CI (−0.65, −0.04), p < 0.01; attention: SMD = −0.12, 95% CI (−0.33, 0.09), p = 0.27; and visuospatial function; SMD = −0.40, 95% CI (−0.61, −0.18), p < 0.01. PD patients with OH did not exhibit significant cognitive impairment in the attention and memory domains but showed marked cognitive deficits in the executive function, verbal ability, and visuospatial function.ConclusionThis meta-analysis indicates that cognitive function decline in PD patients is associated with OH. Patients with OH have lower global cognitive scores compared to those without OH, particularly demonstrating significant deficits in executive, verbal, and visuospatial functions, especially in those with a long disease duration. Clinicians should be vigilant about these potential cognitive deficits and consider comprehensive cognitive assessments and targeted interventions for PD patients experiencing OH.

Kotryna Rekašiūtė

This article presents Lithuanian publications related to the Masonic society which appeared in the late 19th and early 20th century Lithuanian perio­dical press (both in Prussian Lithuania and in the Lithuanian lands of the Russian Empire). It discusses the image of Freemasons in the press dedicated to Lithuanian lands in both empires. The study presents the number of publications released in of the two Lithuanian territories under discussion and identifies the periodicals that published them. It also reveals the cultural context of Masonic-related publications in the periodical press (indicating the authors of the publications, the names of periodical editors, and discussing their connection to the cultural world). The topic of Freemasonry-related Lithuanian publications in the periodical press has not been discussed in detail until now.

R. V. Rybakov

The article is devoted to the analysis of socio-economic methods to overcome youth unemployment in Omsk in the 1920s. Archival materials and regional periodicals are used as the main source base. The publication demonstrates the dependence of the nature of youth unemployment on the specifics of regional industry and analyzes the factors influencing employment dynamics. The author comes to the conclusion that limited material resources and the lack of high demand for qualified specialists made it difficult to solve the problem. At the same time, thanks to the increase in the number of adolescents in the vocational education system, it was possible to stabilize the situation with youth employment and improve their financial situation.

A. Yu. Karpinets

The article is devoted to the development of the Kiselevsk village in 1935, the last year when Kiselevsk existed in the status of a workers’ settlement. The issue of improving the living and communal conditions of the miners of the Kiselevsky mine and their families is being considered. Attention is paid to the problems of the relationship between the material well-being of workers and the increase in labor productivity. The problems of housing and communal services, the development of the branches of upbringing, education and health care are characterized. The methods of ensuring the food security of miners are determined. Specific measures to improve the quality of life of workers in the context of the transformation of the settlement from a working settlement into a city are demonstrated. The novelty of the study is seen in the fact that for the first time, based on the processing of materials from the periodical press, the social sphere of the Kiselyovsky mine was characterized in detail in the mid-1930s. The relevance of the study is due to its scientific and social significance. The first is determined by the fact that this kind of research is undertaken for the first time. The second is connected with the need to draw attention to the problems of sustainable socio-economic development of the city of Kiselevsk at the present time.

Vipin Agrawal, Dhrubaditya Mitra

We study a single, freely--floating, inextensible, elastic filament in a linear shear flow: $\mathbf{U}_{0}(x,y) = \dotγ y \hat{x}$. In our model: the elastic energy depends only on bending; the rate-of-strain, $\dotγ = S \sin(ωt)$ is a periodic function of time, $t$; and the interaction between the filament and the flow is approximated by a local isotropic drag force. Based on the shape of the filament we find five different dynamical phases: straight, buckled, periodic (with period two, period three, period four, etc), chaotic, and one with chaotic transients. In the chaotic phase, we show that the iterative map for the angle, which the end-to-end vector of the filament makes with the tangent its one end, has period three solutions; hence it is chaotic. Furthermore, in the chaotic phase the flow is an efficient mixer.

J. I. Katz

Popular Fast Radio Burst models involve rotating magnetized neutron stars, yet no rotational periodicities have been found. Small datasets exclude exact periodicity in FRB 121102. Recent observations of over 1500 bursts from each of FRB 121102 and FRB 20201124A also have not found periodicity. Periodograms of events with cosine-distributed random offsets as large as $\pm 0.6 P$ from a strict period $P$ would still reveal the underlying periodicity. The sensitivity of periodograms of long data series, such as bursts observed on multiple days, to slow frequency drifts is mitigated by considering individual observing sessions, and results are shown for FRB 121102. Models of repeating FRB without intrinsic periodicity are considered, as are models of apparently non-repeating FRB.

Theo Mckenzie, Mostafa Sabri

We prove quantum ergodicity for a family of periodic Schrödinger operators $H$ on periodic graphs. This means that most eigenfunctions of $H$ on large finite periodic graphs are equidistributed in some sense, hence delocalized. Our results cover the adjacency matrix on $\mathbb{Z}^d$, the triangular lattice, the honeycomb lattice, Cartesian products and periodic Schrödinger operators on $\mathbb{Z}^d$. The theorem applies more generally to any periodic Schrödinger operator satisfying an assumption on the Floquet eigenvalues.

Kristián Benyovszky

The article maps current issues concerning popular literature in Central European cultures with a special emphasis on the Hungarian, Slovak, Czech and Polish contexts. It provides a partial overview of the current state of art and of the research approaches and outlines comparative perspectives. The research of popular literature and culture is done either from the inside, i.e. from the position of the experientially motivated recipient (recipient’s perspective) or from the outside – from the position of an external observer. In the latter approach, the interest might lie in the wider external cultural and social contexts (sociocultural perspective) or in the summarisation of bibliographical data (archival perspective). These research lines testify to generically and thematically typical publications from all four linguistic areas – bibliographies, dictionaries, lexicons, case studies, deeper close readings and book-length research. The corpus this study takes as its material is composed of texts published in periodicals and online materials as platforms where popular literature is published and critically analysed. It also takes into consideration Central European feedback on the writers of the Western canon, imagological analysis of national stereotypes, popular socialist culture, fandom and fan literature and intermediality and transmediality and fan literature and intermediality and transmediality of popular culture.

Sideq Ben Suliman, Mohamed Ben Musa

This study aimed to identify the features of the scientific production about the Corona pandemic published during the year 2020 and indexed in four Arab periodicals platforms. The platforms and published studies on the Corona pandemic were surveyed, Microsoft Excel was used for data analysis. The researchers investigated the thematic, linguistic and temporal trends of this production, as well as identifying the most important periodicals that published it, in addition to the features of authorship, the authors' specializations, and the most important institutions they belong to. The most important results were that the number of articles published on the Corona pandemic amounted to 748 articles. the most important topics covered were medicine, economics, and law, respectively. the Arabic language had the largest share of published articles, and the highest publication rate was in the month of December.

M. A. Abramova

The ongoing transformation of the monetary sphere, affecting its fundamental, organizational, institutional and legal segments, cannot but have a significant impact on the financial behavior of market entities, primarily the population and representatives of small and medium-sized businesses. And the matter is not only in the digitalization of the financial market recognized and generally accepted by all market participants, in the use of digital technologies in the monetary sphere, but also in the growth of geopolitical, informational, behavioral and communication risks. In this regard, the “new realities of the new world” reinforce the relevance of the stated topic, as they add new aspects to the study of financial inclusion. Based on the analysis of the theoretical provisions reflected in the works of modern foreign and Russian researchers of the monetary sphere, the practice of financial regulators in the context of increasing the level of financial inclusiveness, the author of the article comes to the conclusion that in modern realities, not only study, but also risk-oriented regulation of human involvement in economic processes, in particular, regulation of financial inclusion adequate to the “new realities of the new world”. The financial affordability achieved as a result of such regulation provides an opportunity to attract resources for their subsequent use, to optimize financial flows, and to possibly reduce the level of poverty. And, at the same time, financial inclusiveness is the basis for the inclusion of market entities in the formal economy, preventing a possible “leaving” for the informal, “shadow” sphere of life. The theoretical and empirical basis of the study were the results of the works of domestic and foreign authors, legislative and regulatory acts of the Russian Federation, foreign countries, analytical data of central banks, analytical and information materials of Russian and foreign periodicals, Internet networks, revealing the foundations of the transformation of the monetary sphere, assessing its trends in the context of their impact on financial inclusion. At the theoretical level, the study used such methods as terminological analysis of concepts, aggregation and abstraction, induction and deduction, comparative analysis and synthesis, at the empirical level — statistical and correlation. The conclusions drawn by the author can serve as the basis for the recommendations being developed by the Bank of Russia to maintain and increase the achieved level of financial inclusion in the context of the “new realities of the new world”.

Hugo Beirao da Veiga, Jiaqi Yang

We study the motion of an incompressible fluid in an $n+1$-dimensional infinite pipe $\,\La\,$ with an $L$-periodic shape in the $z=x_{n+1}$ direction. We set $\,x=(x_1,x_2,\cdots,x_{n})$, and $z=x_{n+1}$. We denote by $Σ_z$ the cross section of the pipe at the level $z\,,$ and by $v_z$ the $n+1$ component of the velocity. Fluid motion is described by the evolution Stokes or Navier-Stokes equations together with the non-slip boundary condition $\bv=\,0\,$. We look for solutions $\bv(x,z,t)$ with a given, arbitrary, $T-$time periodic total flux $\,\int_{Σ_z} \,v_z(x,z,t)\,dx=g(t)\,,$ which should be simultaneously $T$-periodic with respect to time and $L$-periodic with respect to $z\,.$ We prove existence and uniqueness of the solution to the above problems. The results extend those proved in reference \cite{B-05}, where the cross sections were independent of $z$. The argument is presented through a sequence of steps. We start by considering the linear, stationary, $z-$periodic Stokes problem. Then we study the double periodic evolution Stokes equations, which is the heart of the matter. Finally, we end with the extension to the full Navier-Stokes equations.

M. V. Makarochkina, Ya. P. Sandakov, L. G. Sokolova

Background. Currently, the multichannel nature of financial flows determines the multivariate methods of payment for medical services, which are also influenced by the type of medical care, conditions, form of its provision, and type of institution. As a result, the cost of a medical service can vary significantly not only in different, but even in one medical organization. The lack of a unified methodological approach puts healthcare organizations in unequal conditions, as a result, public sector medical organizations are forced to seek additional resources to provide medical care to the population that meets the standards. None of the current methods for determining the cost of a medical service reflects its actual cost, since it does not take into account the structure of production costs.The aim. To improve the methodology for the formation of the cost of public services in the health care system, taking into account their resource intensity.Materials and methods. The study included the analysis of the forms of state statistical observation of medical organizations of the Irkutsk region, reports of the federal and regional accounting chambers, industry regulations, materials of scientific periodicals, conferences, monographic studies, including on the Internet; comparison of the cost of medical services in various medical organizations of the Irkutsk region; modeling methods for calculating the cost of medical services using the Cobb – Douglas production function.Results. A unified classification of medical services based on their resource intensity and an improved method of forming the cost of medical services based on the Cobb – Douglas production function are proposed, revealing the dependence of the volume of production on two factors of production – capital and labor; the cost of medical services was calculated using the example of real services provided in one of the medical organizations of the public health sector of the Irkutsk region.Conclusions. The proposed method for determining the cost of a medical service based on its resource intensity makes it possible to determine the real cost of a medical service, the full reimbursement of which will increase the financial stability of medical organizations in the public sector, which will be reflected in the improvement of their material and technical base and, as a result, will increase the quality of medical services.

Jani Marjanen, Elaine Zosa, Simon Hengchen et al.

This paper addresses methodological issues in diachronic data analysis for historical research. We apply two families of topic models (LDA and DTM) on a relatively large set of historical newspapers, with the aim of capturing and understanding discourse dynamics. Our case study focuses on newspapers and periodicals published in Finland between 1854 and 1917, but our method can easily be transposed to any diachronic data. Our main contributions are a) a combined sampling, training and inference procedure for applying topic models to huge and imbalanced diachronic text collections; b) a discussion on the differences between two topic models for this type of data; c) quantifying topic prominence for a period and thus a generalization of document-wise topic assignment to a discourse level; and d) a discussion of the role of humanistic interpretation with regard to analysing discourse dynamics through topic models.

Gail A Greendale, Nicholas J Jackson, Weijuan Han et al.

ABSTRACT This longitudinal cohort study's aim was to detect whether larger increases in C‐reactive protein (CRP) predict greater amounts of subsequent bone loss in women transitioning from premenopause to postmenopause. Participants were initially 42 to 52 years of age and premenopausal or early perimenopausal. The sample included 1431 women who were not using hormone therapy and whose CRP values were not consistent with acute inflammation. Individual fixed effects (IFE) models estimated the association of log2 CRP with subsequent bone mineral density (BMD) decline rate, adjusted for menopause transition (MT) stage (1: premenopausal or early perimenopausal; 2: late perimenopausal or early postmenopausal; or 3: late postmenopausal), body mass index, diabetes, smoking, alcohol, bone active medications, and anti‐inflammatory medications. BMD decline at both the lumbar spine (LS) and femoral neck (FN) was faster for observations made in MT stage 2 than that during other stages (all p < .001). In adjusted IFE models, MT stage modified the relation between increase in CRP and BMD decline rate (interaction p values <.05). Each within‐woman doubling of CRP was associated with a 0.09% faster yearly decline in FN BMD in MT stages 1 (p = .006) and 3 (p = .03), and 0.10% faster decline in LS BMD in MT stage 3 only (p = .007). Within‐woman increases in CRP in premenopause and early perimenopause and in late postmenopause predict faster BMD decline in the next ~2 years, but the magnitude of CRP's effect is small. © 2021 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.

L. de Jesus, C. M. Silva, H. Vilarinho

We address the existence of periodic orbits for periodic eco-epidemiological system with disease in the prey. To do it, we consider three main steps. Firstly we study a one parameter family of systems and obtain uniform bounds for the components of any periodic solution of these systems. Next, we make a suitable change of variables in our family of systems to establish the setting where we are able to apply Mawhin's continuation Theorem. Finally, we use Mawhin's continuation Theorem to obtain our result. Later on, we present two examples that include previous results in the literature and some numerical simulations to illustrate our results.