Hasil untuk "Periodicals"

Cyntia Espinosa Acosta, Jaime Humberto Moreno Méndez

La adolescencia es una etapa de la vida en la cual se presenta alta comorbilidad entre problemas alimenticios, emocionales y afectivos; no obstante, en la evidencia empírica, se reporta inestabilidad en las asociaciones entre dichas variables. Por lo tanto, se llevó a cabo un estudio acerca de los avances en el conocimiento sobre estas relaciones, cuyo objetivo fue mapear la producción científica acerca de la relación entre problemas alimenticios y comportamientos internalizados en adolescentes, comprendiendo un periodo de 2019 a 2024. Se realizó una revisión de alcance de artículos publicados en las bases de datos EBSCO, ScienceDirect, Scopus y PsycArticles. Se encontraron 52.643 registros, de los cuales se escogieron 24 para el presente análisis. Los resultados señalaron que los adolescentes son más propensos a presentar trastornos de conducta alimentaria con comportamientos internalizados, en particular en la adolescencia tardía, siendo más común la relación entre la bulimia y la anorexia nerviosa, con comportamientos como la ansiedad y la depresión. Por otra parte, las mujeres tienen más probabilidades de padecer problemas alimentarios en comparación con los hombres, en una proporción de 9 a 1. Estos hallazgos sugieren estrategias de prevención e intervención para adolescentes con problemas alimenticios y comportamientos internalizados.

Yücel Yiğit, Cihan Özgün

This study examines the evolution of the Ottoman Maritime Police from the mid-XIXth century, when it was founded, to the early years of the Second Constitutional Era, highlighting the development of coastal security responsibilities within the Ottoman police structure. Initially managed by Ottoman military officers in the classical period, coastal security shifted to civilian roles such as safety boatmen and porters, especially after the abolition of the Janissary Corps. Legal reforms in the Union and Progress Era marked a significant restructuring aimed at addressing smuggling, etc., establishing the Maritime Central Office under the supervision of the Istanbul Police.The primary responsibilities of the Ottoman Maritime Police included ensuring coastal security, preventing smuggling, and administering entry permits for travelers. With the inclusion of motorized vessels in their inventory, they have become an integral part of maritime security. This research emphasizes the role of the Ottoman Maritime Police in adapting to the security needs that have emerged within the framework of Turkey’s modern law enforcement forces and their legacy. Using the Presidency of the State Archives, the Ottoman Archives, the General Directorate of Security Archives, and various periodicals, this article traces the development of the Ottoman Maritime Police, focusing on its duties, operational challenges, and organizational changes.

Adam Skowyrski

This article is devoted to introduce a new notion of periodicity shadow, which appeared naturally in the study of combinatorics of tame symmetric algebras of period four, or more generally, algebras of generalized quaternion type. For any such an algebra $\La$, we consider its shadow $\bS_\La$, which is the (signed) adjacency matrix of the Gabriel quiver of $\La$. Studying properties of shadows $\bS_\La$ leads us to the definition of the periodicity shadow, which is basically, a skew-symmetric integer matrix satisfying certain set of conditions motivated by the properties of shadows $\bS_\La$. This turned out to be a very useful tool in describing the combinatorics of Gabriel quivers of algebras of generalized quaternion type, not only for algebras with small Gabriel quivers (i.e. up to $6$ vertices), which it was originally desined for. In this paper, we introduce and briefly discuss this notion and present one of its theoretical applications, which shows how significant it is. Namely, the main result of this paper describes the global shape of the Gabriel quivers of algebras of generalized quaternion type, as quivers obtained from some basic shadows by attaching $2$-cycles, and moreover, postion of the $2$-cycles is restricted by precise rules (see the Main Theorem). Computational aspects are reported in the second part.

Natalia Saburova

We consider discrete Schrödinger operators with periodic potentials on periodic graphs. Their spectra consist of a finite number of bands. We perturb a periodic graph by adding edges in a periodic way (without changing the vertex set) and show that if the added edges are long enough, then the perturbed graph is asymptotically isospectral to some periodic graph of a higher dimension but without long edges. We also obtain a criterion for the perturbed graph to be not only asymptotically isospectral but just isospectral to this higher dimensional periodic graph. One of the simplest examples of such asymptotically isospectral periodic graphs is the square lattice perturbed by long edges and the cubic lattice. We also get asymptotics of the endpoints of the spectral bands for the Schrödinger operator on the perturbed graph as the length of the added edges tends to infinity.

Yen-Tsung Chen, Changningphaabi Namoijam

Inspired by the relations between periods of elliptic integrals of the third kind and the periods of the extensions of the corresponding elliptic curves by the multiplicative group, we introduce the notion of the third kind periods for abelian $t$-modules and establish an evaluation for these periods that is parallel to the classical setting. When we specialize our result to the case of Drinfeld modules, an explicit formula for these third kind periods is established. We also prove the algebraic independence of periods of the first, the second, and the third kind for Drinfeld modules of arbitrary rank. This generalizes prior results of Chang for rank $2$ Drinfeld modules.

Favour C. Uroko

This article examines Proverbs 3:31–35 in the exam malpractice crisis ravaging secondary schools in Nigeria. Proverbs 3:31–35 has the central thesis of the call to avoid the company of evildoers and the blessings of going on the right path. Scholars have approached the issue of examination malpractice from an economic, social and psychological lens. In this study, the Old Testament was used as the lens for tackling the situation. This is a qualitative study using the rhetorical method. The data were obtained from the Bible, Bible commentaries, gazettes, journal articles and other periodicals. Emerged themes include: (1) warning not to join bad people; (2) consequences of the warning and (3) end point of one’s decision. Exam misconduct reflects deeper societal concerns such as corruption, weak regulatory enforcement and the temptation to succeed at any cost. Intradisciplinary and/or interdisciplinary implications: Proverbs 3:31–35 has shown that the increasing number of graduates who cannot defend their certificates and corruption is caused by the blatant and obscene nature of exam malpractice in Nigeria. Old Testament and Practical Theology were implicated in the study.

Refqa Abu-Remaileh, Lindsey Waldenberg

In this interview, Dr. Refqa Abu-Remaileh discusses her new project, Country of Words: A Transnational Atlas for Palestinian Literature. Country of Words combines literary history, a rich and expansive set of primary sources, and digital humanities tools to trace Palestinian literature’s development in the twentieth century. Abu-Remaileh resists the de facto use of the predominant nation state framework to categorize Palestinian literature, an approach, she asserts, that is inadequate for conveying continuities between periods and literary geographies. Instead, Country of Words demonstrates the possibility of methodologies for studying the creation and dissemination of national and exilic literature beyond set physical and temporal borders. Her project primarily uses periodicals published throughout the Arab world and across the North and South American mahjars to demarcate Palestinian literature’s development into seven separate, though sometimes concurrent, periods. Coupled with the use of digital humanities tools, her project offers readers the opportunity to not only interact with a comprehensive overview of Palestinian local and global works but also consider the overlapping networks and trajectories that characterize and continue to shape this literature. This interview discusses the project’s inception, accomplishments, challenges, and impact.

Matthew Williams, Oleg Makarenkov

We prove that if a certain entry in the map of the Hadamard-Perron theorem is $T$-periodic in one of the variables, then the stable manifold guaranteed by the Hadamard-Perron theorem is a graph of a $T$-periodic function. As an application, we extend the classical Levinson's result about the occurrence of an attracting closed invariant curve near a stable cycle of a system of autonomous equations under periodic perturbations to hybrid differential equations.

Shih-Yu Chen

In this paper, under some regularity conditions, we prove a period relation between the Betti--Whittaker periods associated to a regular algebraic cuspidal automorphic representation of ${\rm GL}_n(\mathbb{A})$ and its contragredient. As a consequence, we obtain the trivialness of the relative period associated to a regular algebraic cuspidal automorphic representation of ${\rm GL}_{2n}(\mathbb{A})$ of orthogonal type, which implies the algebraicity of the ratios of successive critical $L$-values for ${\rm GSpin}_{2n}^* \times {\rm GL}_{n'}$ by the result of Harder and Raghuram.

Peter Albers, Philipp Aretz, Irene Seifert

We construct and analyze families of periodic delay orbits for a class of delay differential equations in two dimensions depending on two real-valued functions. These families are parametrized by the delay parameter. It is possible to represent the dependency of these periodic delay orbits on the delay parameter by a curve in the plane, without loss of information. It turns out that the singularities of these curves necessarily are cusps in the non-degenerate case. After discussing degenerate situations in general, we explain how to glue different families of periodic delay orbits at degeneracies in the delay parameter.

Fangzhou Ai, Vitaliy Lomakin

We propose a Fast Fourier Transform based Periodic Interpolation Method (FFT-PIM), a flexible and computationally efficient approach for computing the scalar potential given by a superposition sum in a unit cell of an infinitely periodic array. Under the same umbrella, FFT-PIM allows computing the potential for 1D, 2D, and 3D periodicities for dynamic and static problems, including problems with and without a periodic phase shift. The computational complexity of the FFT-PIM is of $O(N \log N)$ for $N$ spatially coinciding sources and observer points. The FFT-PIM uses rapidly converging series representations of the Green's function serving as a kernel in the superposition sum. Based on these representations, the FFT-PIM splits the potential into its near-zone component, which includes a small number of images surrounding the unit cell of interest, and far-zone component, which includes the rest of an infinite number of images. The far-zone component is evaluated by projecting the non-uniform sources onto a sparse uniform grid, performing superposition sums on this sparse grid, and interpolating the potential from the uniform grid to the non-uniform observation points. The near-zone component is evaluated using an FFT-based method, which is adapted to efficiently handle non-uniform source-observer distributions within the periodic unit cell. The FFT-PIM can be used for a broad range of applications, such as periodic problems involving integral equations in computational electromagnetic and acoustic, micromagnetic solvers, and density functional theory solvers.

Julia Cen, Yogesh N. Joglekar, Avadh Saxena

Hermitian Hamiltonians with time-periodic coefficients can be analyzed via Floquet theory, and have been extensively used for engineering Floquet Hamiltonians in standard quantum simulators. Generalized to non-Hermitian Hamiltonians, time-periodicity offers avenues to engineer the landscape of Floquet quasi-energies across the complex plane. We investigate two-level non-Hermitian Hamiltonians with coefficients that have different periodicities using Floquet theory. By analytical and numerical calculations, we obtain their regions of stability, defined by real Floquet quasi-energies, and contours of exceptional point (EP) degeneracies. We extend our analysis to study the phases that accompany the cyclic changes. Our results demonstrate that time-periodic, non-Hermitian Hamiltonians generate a rich landscape of stable and unstable regions.

Takuya Inoue, Yusuke Nakamura

The purpose of this paper is to extend the scope of the Ehrhart theory to periodic graphs. We give sufficient conditions for the growth sequences of periodic graphs to be a quasi-polynomial and to satisfy the reciprocity laws. Furthermore, we apply our theory to determine the growth series in several new examples.

I. V. Fedotova

The article described a little-studied aspect of Soviet military construction in Siberia at the final stage of the Civil War in Russia — the creation and the first months of the activity of the Siberian Directorate of Military Educational Institutions of the Red Army. The source base of the study is unpublished materials of the office work of Siberian Revolutionary Committee, the Omsk press and memoirs. The theoretical basis of the study is a combination of anthropological and systemic approaches, problem-chronological, comparative-historical and biographical methods. The author comes to the conclusion about the key role of the Soviet military leaders M. N. Tukhachevsky and N. I. Koritsky in the formation of a network of military schools in Siberia, and the influence of the Siberian Directorate of Military Educational Institutions on the development of military education in the region and the cultural level of the local population.

Daniel Sullivan

This essay reviews the anthology Siegfried Kracauer: Selected Writings on Media, Propaganda, and Political Communication (2022), edited and with translations by Jaeho Kang, Graeme Gilloch, and John Abromeit. The editors describe the volume as "a selection of Kracauer’s diverse materials on propaganda and political communication – texts hitherto unavailable in English or strewn among different […] journals, periodicals, and magazines" (2). Beyond this, Selected Writings presents readers and scholars with an opportunity to re-evaluate the legacy of Siegfried Kracauer, particularly in connection with the strands of mutual influence and parallel thought between his work and the development of early Frankfurt School critical theory. The volume contains remarkable and largely unpublished work on totalitarian propaganda in film; the manipulative devices of the U.S. advertising industry of the 1940s and 50s; and philosophy of science in the area of sociologically informed empirical research.

Izabela Krasińska

In the 1930s, the Polish-language Orthodox periodicals appeared on the press and the publishing market. Their recipients were the Orthodox believers living mainly in the eastern areas of the Second Polish Republic, and their creators were the Orthodox Polish intelligentsia, including the clergy. One of such magazines was ‘Przegląd Prawosławny’, published from January to August 1939 in Grodno. The editor in charge of the magazine was Fr. Leonidas Kasperski, and the publisher is the Orthodox Scientific and Publishing Institute. The analyzed magazine was partly of the local nature, as a lot of space was devoted to the life and activities of the Orthodox believers from the Nowogródek and Białystok voivodeships. Polish culture, history, language and traditions were promoted in ‘Przegląd Prawosławny’. They wrote about the affairs of the contemporary Church in Poland and around the world, as well as about its dignitaries. The life and activities of the Orthodox Polish patriots from the past eras were described.

Claudio Vita-Finzi

The Schwabe (~11 yr) value for the annual sunspot number is sometimes uncritically applied to other measures of solar activity, direct and indirect, including the 10.7 cm radio flux, the inflow of galactic cosmic rays, solar flare frequency, terrestrial weather, and components of space climate, with the risk of a resulting loss of information. The ruling (Babcock) hypothesis and its derivatives link the sunspot cycle to dynamo processes mediated by differential solar rotation, but despite 60 years of observation and analysis the ~11 yr periodicity remains difficult to model; the possible contribution of planetary dynamics is undergoing a revival. The various solar sequences that genuinely display an ~11 yr cycle stand to benefit from an understanding of its periodicity that goes beyond statistical kinship. The outcome could ironically prompt the demotion of sunspots from their dominant historical role in favour of other possible indicators of solar cyclicity, such as the solar wind flux and its isotopic signatures, even if they are less accessible.

Ezekiel Barnett, Olga Kaiser, Jonathan Masci et al.

We introduce a new periodicity detection algorithm for binary time series of event onsets, the Gaussian Mixture Periodicity Detection Algorithm (GMPDA). The algorithm approaches the periodicity detection problem to infer the parameters of a generative model. We specified two models - the Clock and Random Walk - which describe two different periodic phenomena and provide a generative framework. The algorithm achieved strong results on test cases for single and multiple periodicity detection and varying noise levels. The performance of GMPDA was also evaluated on real data, recorded leg movements during sleep, where GMPDA was able to identify the expected periodicities despite high noise levels. The paper's key contributions are two new models for generating periodic event behavior and the GMPDA algorithm for multiple periodicity detection, which is highly accurate under noise.

E.V. Eremina, Yu.R. Lukanina, A.V. Lukanin

Background. Modern youth spends the most of their lives in social networks. Thus, it is social networks as an information and communication space that largely shape the attitudes and values of young people, a certain virtual identity in all its manifestations, and influence the real behavior of young people in society. The purpose of the study is to consider the figurative-symbolic and cultural-traditional aspects of the influence of social networks on modern youth. Materials and methods. When implementing the tasks set, methods of scientific analysis and generalization of periodicals, statistical information on the research problem, methods of secondary analysis of various sociological surveys on the topic under study were used. The main methods of empirical research were conducted with the participation of the authors a mass questionnaire survey of school and student youth in Moscow, Penza and Saratov regions (n = 1000), a semi-formalized interview with students of Penza universities (n = 50), as well as an analysis of the content of a social network “VKontakte” which is popular among young people. Results. The study conducted by the authors gives an idea of the deep involvement of modern youth in the virtual space through the active use of various social networks. The analysis of questionnaires and interviews shows the structure of the interests of young people with a predominance of the desire to communicate and have fun, as well as the peculiarities of the influence of the content of the messengers they use on the cultural, personal and civic identification of young people. Conclusions. The results of the study indicate the need to use the potential of the figurative-symbolic and socio-cultural content of social networks as the most important condition for the formation of the state-civil identity of young people.

Jonathan J Neville, Tommaso Palmieri, Antony R Young

ABSTRACT Vitamin D synthesis by exposure of skin to solar ultraviolet radiation (UVR) provides the majority of this hormone that is essential for bone development and maintenance but may be important for many other health outcomes. This process, which is the only well‐established benefit of solar UVR exposure, depends on many factors including genetics, age, health, and behavior. However, the most important factor is the quantity and quality of UVR reaching the skin. Vitamin D synthesis specifically requires ultraviolet B (UVB) radiation that is the minority component (<5%) of solar UVR. This waveband is also the most important for the adverse effects of solar exposure. The most obvious of which is sunburn (erythema), but UVB is also the main cause of DNA damage to the skin that is a prerequisite for most skin cancers. UVB at the Earth's surface depends on many physical and temporal factors such as latitude, altitude, season, and weather. Personal, cultural, and behavioral factors are also important. These include skin melanin, clothing, body surface area exposed, holiday habits, and sunscreen use. There is considerable disagreement in the literature about the role of some of these factors, possibly because some studies have been done by researchers with little understanding of photobiology. It can be argued that vitamin D supplementation obviates the need for solar exposure, but many studies have shown little benefit from this approach for a wide range of health outcomes. There is also increasing evidence that such exposure offers health benefits independently of vitamin D: the most important of which is blood‐pressure reduction. In any case, public health advice must optimize risk versus benefit for solar exposure. It is fortunate that the individual UVB doses necessary for maintaining optimal vitamin D status are lower than those for sunburn, irrespective of skin melanin. © 2020 The Authors. JBMR Plus published by Wiley Periodicals LLC. on behalf of American Society for Bone and Mineral Research.