Hasil untuk "Periodicals"

Ariana Chin

In 2007, Fomin and Zelevinsky introduced the bipartite belt, a sequence of bipartite mutations whose exchange relations form a discrete dynamical system. Periodicity of this system is known as Zamolodchikov periodicity. In our previous work we have classified all Zamolodchikov periodic cluster algebras, but behavior halfway through the period was still unknown. This so-called half-periodicity was conjectured by Kuniba--Nakanishi--Suzuki for $Y$-systems of finite type Cartan matrices, and was proved by Inoue--Iyama--Keller--Kuniba--Nakanishi for tensor products of two simply-laced Dynkin diagrams. In this paper, we prove that for any Zamolodchikov periodic cluster algebra, the form at the half-period is a permutation of the cluster variables of order at most two.

Zhuoqi Lyu, Qing Ke

Understanding the changing structure of science over time is essential to elucidating how science evolves. We develop diachronic embeddings of scholarly periodicals to quantify "semantic changes" of periodicals across decades, allowing us to track the evolution of research topics and identify rapidly developing fields. By mapping periodicals within a physical-life-health triangle, we reveal an evolving interdisciplinary science landscape, finding an overall trend toward specialization for most periodicals but increasing interdisciplinarity for bioscience periodicals. Analyzing a periodical's trajectory within this triangle over time allows us to visualize how its research focus shifts. Furthermore, by monitoring the formation of local clusters of periodicals, we can identify emerging research topics such as AIDS research and nanotechnology in the 1980s. Our work offers novel quantification in the science of science and provides a quantitative lens to examine the evolution of science, which may facilitate future investigations into the emergence and development of research fields.

Anatoli Ivanov, Bernhard Lani-Wayda, Sergiy Shelyag

A simple non-autonomous scalar differential equation with delay, exponential decay, nonlinear negative feedback and a periodic multiplicative coefficient is considered. It is shown that stable slowly oscillating periodic solutions with the period of the feedback coefficient, and also with the double period of the feedback coefficient exist. The periodic solutions are built explicitly in the case of piecewise constant feedback function and the periodic coefficient. The periodic dynamics are shown to persist under small perturbations of the equation which make it smooth. The results are confirmed and illustrated by numerical simulations.

Masaki Takayama

30$\%$--50$\%$ of the luminous pulsating red-giant stars show light variations of a longer period than the pulsation periods. Those periods are called long secondary periods (LSP). There has been debated for many years but the origin of the LSP is still unknown. To explain the LSP variations, there have been many approaches in not only observations but also theoretical studies. However, the invariance of the length of the LSPs has been investigated little. Thus, we studied the temporal variations of the period by performing the weighted wavelet-Z-transform analysis. Using the OGLE-III database, the $I$-band light curves of 6904 and 1945 LSP candidates in the Large/Small Magellanic Clouds, respectively, were analyzed. Most of our sample stars indicated that the period corresponding to the LSP was constant during the observation term. However, 101 and 44 LSP stars in the LMC and SMC, respectively, showed the signature of the temporal variations of the LSPs. There were diversities of the period modulations i.e. monotonic increase or decrease, or constant until the middle and then increase, etc. The comet-like companion is one of the possible explanations for the LSP variations, but this hypothesis cannot explain the period modulations because the LSP is determined by the orbital period.

Aušra Navickienė

The aim of this article is to reconstruct the history of how anniversaries of Francysk Skaryna’s life and work were commemorated in the Lithuanian academic environment. It looks for answers to questions of when these anniversaries began to be celebrated in Lithuania, which part of the academic community was involved in these activities, and how they have contributed to the dissemination of the knowledge of book studies. The author analysed scholarly events and anniversary publications dedicated to Francysk Skaryna by discussing the authors and the content of scholarly publishing results, as well as the organizers, topics, and participant geography of scholarly events. Collection of data from written sources, such as various bibliographic resources, official documents, memoirs, and informational articles published in periodicals in various historical periods, was aided by examining informational and scholarly publications de visu and applying other methods of historical research. The collected historical facts were studied in the context of Skaryna studies and the historiography of the Lithuanian book, evaluated from the viewpoint of scholarly communication and systematized by using the already-established periodization of Lithuanian book studies.

S. O. Buranok

The Monroe Doctrine occupies a unique place in the US history. It became one of the key foreign policy documents of its time and provided the basis for a wide variety of interpretations of the United States’ role and goals in the international arena at turning points of world history. One of these moments was the turn of the 1910s−1920s, when a new Versailles-Washington order of international relations was emerging. In the US public discourse, this period was marked by intense debates between supporters of the Democratic President V. Wilson and his isolationist opponents. Both Republicans and Democrats constantly referred to the Monroe Doctrine, on the one hand, to justify their own views on US foreign policy in the new conditions, and, on the other hand, to refute the arguments of their political opponents. The controversy surrounding the Monroe Doctrine has been reflected in publications in periodicals and analytical journals, as well as in cartoons. Studying these materials, it is possible to trace the evolution of the approaches of American politicians, experts, editors, and journalists to the Monroe Doctrine. The arguments of the Republicans against the ‘internationalist’ interpretation of the Monroe Doctrine that emerged in the face of the changing global context after the First World War are of particular interest. The study shows that at the initial stage of discussions (1920), the Monroe Doctrine was used by the Republicans primarily to criticize W. Wilson’s concept of international relations in general and his position on the League of Nations in particular. At the next stage (1921−1923), the debate focused around the need to revise the Monroe Doctrine itself, that aroused due to new trends in the development of international relations in the Far East and, in particular, because of the increasing competition between the United States and Japan. The author identifies several main approaches to the interpretation of the Monroe Doctrine formulated during the public debate in 1921−1923. It is shown that, despite significant divergences of view, both isolationists and internationalists eventually came to broader interpretations of the Monroe Doctrine, recognizing the need to extend its principles to the entire Asia-Pacific region.

Harshini Suresh Kumar, Edwina N. Barnett, John L. Fowlkes et al.

ABSTRACT Diabetes is a chronic metabolic disorder that can lead to diabetic myopathy and bone diseases. The etiology of musculoskeletal complications in such metabolic disorders and the interplay between the muscular and osseous systems are not well understood. Exercise training promises to prevent diabetic myopathy and bone disease and offer protection. Although the muscle‐bone interaction is largely biomechanical, the muscle secretome has significant implications for bone biology. Uncoupling effects of biophysical and biochemical stimuli on the adaptive response of bone during exercise training may offer therapeutic targets for diabetic bone disease. Here, we have developed an in vitro model to elucidate the effects of mechanical strain on myokine secretion and its impact on bone metabolism decoupled from physical stimuli. We developed bone constructs using cross‐linked gelatin, which facilitated osteogenic differentiation of osteoprogenitor cells. Then muscle constructs were made from fibrin, which enabled myoblast differentiation and myotube formation. We investigated the myokine expression by muscle constructs under strain regimens replicating endurance (END) and high‐intensity interval training (HIIT) in hyperglycemic conditions. In monocultures, both regimens induced higher expression of Il15 and Igf1, whereas END supported more myoblast differentiation and myotube maturation than HIIT. When co‐cultured with bone constructs, HIIT regimen increased Glut4 expression in muscle constructs more than END, supporting higher glucose uptake. Likewise, the muscle constructs under the HIIT regimen promoted a healthier and more matured bone phenotype than END. Under static conditions, myostatin (Mstn) expression was significantly downregulated in muscle constructs co‐cultured with bone constructs compared with monocultures. Together, our in vitro co‐culture system allowed orthogonal manipulation of mechanical strain on muscle constructs while facilitating bone‐muscle biochemical cross‐talk. Such systems can provide an individualized microenvironment that allows decoupled biomechanical manipulation, help identify molecular targets, and develop engineered therapies for metabolic bone disease. © 2023 The Authors. JBMR Plus published by Wiley Periodicals LLC. on behalf of American Society for Bone and Mineral Research.

Helena Březinová, Jana Lainto

In our contribution, we explore the Czech-speaking discourse related to Georg Brandes in the Bohemian Lands in the late nineteenth and the early twentieth century, which means before and shortly after Czechs gained their independence from Austria-Hungary in 1918. Our research of archival sources, especially periodicals and private letters, enables us to confidently claim that the impact of Brandes’s criticism on the Czech arts was rather insignificant. At the same time, the sources give a clear picture that the Czech-speaking intelligentsia were interested in using Brandes’s symbolic capital to promote their struggle for Czech cultural autonomy. Thus, it was not Brandes’s works that can be considered influential in the Czech context but his persona. This strategy of using Brandes’s symbolic capital mirrors his own efforts to be viewed as an international intermediary. Finally, we explore the East-West dynamics in Brandes’s relationship with Czechs and vice versa, and here, we identify a considerable asymmetry

Satoshi Usui

For an eventually periodic module, we have the degree and the period of its first periodic syzygy. This paper studies the former under the name \lq\lq periodic dimension\rq\rq. We give a bound for the periodic dimension of an eventually periodic module with finite Gorenstein projective dimension. We also provide a method of computing the Gorenstein projective dimension of an eventually periodic module under certain conditions. Besides, motivated by recent results of Dotsenko, Gélinas and Tamaroff and of the author, we determine the bimodule periodic dimension of an eventually periodic Gorenstein algebra. Another aim of this paper is to obtain some of the basic homological properties of eventually periodic algebras. We show that a lot of homological conjectures hold for this class of algebras. As an application, we characterize eventually periodic Gorenstein algebras in terms of bimodules Gorenstein projective dimensions.

Eva Skříčková

The reviews, editorials, and short summaries that appear in archived Czech periodicals provide an abundant source of documentation on the propagation of Italian culture, as well as the Italian reception of Czech literature and culture, shedding light on a number of important figures and institutions that played a role in Czech-Italian cultural exchange. This study examines the mutual cultural relations that took place at the level of various institutions, including the organisation of numerous lectures and conferences, at which notable guests were invited to speak on (and promote) Italian culture and language. At its peak, this cultural exchange also included the founding of a library of Italian literary works and publication of various periodicals, as well as the participation of both Czech and Italian academics and intellectuals residing in Prague in the promotion of Italian culture.

Jerzy Zając

Reborn in 1918, the Second Polish Republic returned to the part of the territory lost in the East to undertake the hardships of developing the war-ravaged land. Its history was reflected in the local press and the memories of the “Polonuses” living in these areas. It was recorded in dozens of magazine titles issued mainly by the contemporary Catholic world. The titles mentioned in the present work indicate the life areas of people inhabiting those regions, which were penetrated by the press and which are, in a sense, equivalent only to the names of Polish old mansions in the East. Getting acquainted with their content requires meticulous study which would allow to discover and bring closer the worlds described there and still little known to us and which were deliberately and systematically destroyed by anti-Polish and anti-Catholic forces. The uneasy task of deciphering the Borderlands from its publishing legacy which is still, to this day, being rediscovered, will constitute the content of the second part of the study devoted to Catholic periodicals in Eastern Borderlands of the Second Polish Republic.

José Omar Varela Herrera, Leiden Liseth Márquez Rodríguez

El artículo tuvo como objetivo, analizar las prácticas pedagógicas interculturales en los licenciados en formación de la Facultad de Bellas Artes de la Universidad Popular del Cesar. Metodológicamente, se enmarcó en la tradición cualitativa desde una perspectiva fenomenológica, utilizando la entrevista como instrumento para recoger información. Los datos revelaron debilidades en los docentes y en los estudiantes, como informantes del proceso investigativo, sobre su conocimiento del enfoque educativo intercultural. La entrevista evidenció que les otorgan significatividad a las prácticas pedagógicas interculturales en la formación del profesorado. Las conclusiones apuntaron hacia la necesidad de aportar una serie de orientaciones para la acción pedagógica a los fines de potenciar y optimizar las prácticas interculturales que, actualmente, son utilizadas por los docentes y estudiantes, con la finalidad de contribuir al abordaje de la interculturalidad en el escenario educativo.

Michele Trabucchi, Nami Mowlavi

Pieces of empirical evidence suggest the existence of a period-age relation for long-period variables (LPVs). Yet, this property has hardly been studied on theoretical grounds thus far. We aim to examine the period-age relation using the results from recent nonlinear pulsation calculations. We combined isochrone models with theoretical periods to simulate the distribution of fundamental mode LPV pulsators, which include Miras, in the period-age plane, and we compared it with observations of LPVs in Galactic and Magellanic Clouds' clusters. In agreement with observations, models predict that the fundamental mode period decreases with increasing age because of the dominant role of mass in shaping stellar structure and evolution. At a given age, the period distribution shows a non-negligible width and is skewed toward short periods, except for young C-rich stars. As a result, the period-age relations of O-rich and C-rich models are predicted to have different slopes. We derived best-fit relations describing age and initial mass as a function of the fundamental mode period for both O- and C-rich models. The study confirms the power of the period-age relations to study populations of LPVs of specific types, either O-rich or C-rich, on statistical grounds. In doing so, it is recommended not to limit a study to Miras, which would make it prone to selection biases, but rather to include semi-regular variables that pulsate predominantly in the fundamental mode. The use of the relations to study individual LPVs, on the other hand, requires more care given the scatter in the period distribution predicted at any given age.

Takako Kojima

As potential conflicts of interest (COI) are common in biomedical research, handling related issues and managing disclosures is increasingly important. The International Committee of Medical Journal Editors (ICMJE) revised its guidance on COI in 2019 and introduced the latest version of the COI Disclosure Form in 2021. These documents provide guidance regarding COI policy for ICMJE member and non-member journals. The 2019 revision overviews the main changes in the ICMJE policy. The ICMJE prioritizes appropriate COI disclosures by authors and all others involved in scholarly publishing. Increasing the global awareness of the COI updated policies among all stakeholders is essential for strengthening ethical standing of journals.

Wei Qu, Li Yao, Xiaodan Liu et al.

Background: This study aimed to explore the effects of sodium-glucose co-transporter 2 (SGLT2) on hemoglobin levels in patients with type 2 diabetes mellitus (T2DM) and chronic kidney disease.Methods: PubMed, EMBASE, the Cochrane Central Register of Controlled Trials, the China National Knowledge Infrastructure database, Wanfang Digital Periodicals Database (WFDP) and the Chinese Biological and Medical database (CBM) were searched for randomized trials of SGLT2 inhibitors in patients with T2DM and chronic kidney disease up to July 25, 2020. A total of four studies that included 19,259 patients were identified.Results: Compared to control patients, SGLT2 inhibitors were shown to increase hemoglobin levels in patients with T2DM and chronic kidney disease (standard mean difference = 0.70, 95% CI, 0.59–0.82, p < 0.0001).Conclusion: SGLT2 inhibitors may bring additional benefits to patients with T2DM and chronic kidney disease.

Stanislav Jabuka

Edmonds famously proved that every periodic knot of genus g possesses an equivariant Seifert surface of genus g. We show that this is not true if one instead considers nonorientable spanning surfaces of a periodic knot. We demonstrate by example that the difference between the first Betti number of an equivariant and a nonequivariant nonorientable spanning surface of a periodic knot, can be arbitrarily large.

Lisa Egund, Sigrid Isaksson, Fiona E McGuigan et al.

ABSTRACT This study investigates the sex steroid hormone profile in younger men with distal radius fracture (DRF) to elucidate if this could explain the low bone density and osteoporosis previously observed. In a case–control study, 73 men with DRF (mean age 38 ± 9 years; range, 20–51) was compared with 194 age‐matched, population controls. Performed assays: total testosterone (TT), calculated free testosterone (cFT), luteinizing hormone (LH), follicle‐stimulating hormone (FSH), sex hormone‐binding globulin (SHBG), and total estradiol (E2). BMD hip and spine were measured. Fracture cases had lower cFT (298 versus 329 pmol/L; p = 0.008), but not TT, compared with controls. FSH and SHBG were not statistically different. LH was almost 30% higher (5.7 versus 4.5 IU/L; p < 0.001) and a lower E2 was observed (80.0 versus 87.1; p = 0.098). Men with DRF had a lower E2/SHBG ratio compared with controls (2.3 versus 2.9; p = 0.013). A higher proportion of the fracture group had low TT (<10.5 nmol/L; 21% versus 11%; p = 0.052), low cFT (<220 pmol/L; 18% versus 8%; p = 0.017), and low E2 (<73 pmol/L; 48% versus 35%; p = 0.044). Odds ratio (OR) for fracture when having low cFT was 2.3 (95% CI, 1.02–5.49; p = 0.044); with low E2, the OR was 1.7 (95% CI, 0.96–2.96). In this study in young men with DRF exploring sex hormone levels, we find that sex hormone profiles may be disturbed with a lower E2/SHBG ratio, lower cFT, and higher LH. Estrogen is also a strong determinant of bone mass in men; hence, low levels of E2 may be contributing to the observed lower BMD and these differences may be relevant to fracture risk. © 2020 The Authors. JBMR Plus published by Wiley Periodicals LLC on behalf of American Society for Bone and Mineral Research.

Hao Peng, Qing Ke, Ceren Budak et al.

Understanding the structure of knowledge domains is one of the foundational challenges in science of science. Here, we propose a neural embedding technique that leverages the information contained in the citation network to obtain continuous vector representations of scientific periodicals. We demonstrate that our periodical embeddings encode nuanced relationships between periodicals as well as the complex disciplinary and interdisciplinary structure of science, allowing us to make cross-disciplinary analogies between periodicals. Furthermore, we show that the embeddings capture meaningful "axes" that encompass knowledge domains, such as an axis from "soft" to "hard" sciences or from "social" to "biological" sciences, which allow us to quantitatively ground periodicals on a given dimension. By offering novel quantification in science of science, our framework may in turn facilitate the study of how knowledge is created and organized.

Suphan Kirmizialtin, David Wrisley

Our study utilizes deep learning methods for the automated transcription of late nineteenth- and early twentieth-century periodicals written in Arabic script Ottoman Turkish (OT) using the Transkribus platform. We discuss the historical situation of OT text collections and how they were excluded for the most part from the late twentieth century corpora digitization that took place in many Latin script languages. This exclusion has two basic reasons: the technical challenges of OCR for Arabic script languages, and the rapid abandonment of that very script in the Turkish historical context. In the specific case of OT, opening periodical collections to digital tools require training HTR models to generate transcriptions in the Latin writing system of contemporary readers of Turkish, and not, as some may expect, in right-to-left Arabic script text. In the paper we discuss the challenges of training such models where one-to-one correspondence between the writing systems do not exist, and we report results based on our HTR experiments with two OT periodicals from the early twentieth century. Finally, we reflect on potential domain bias of HTR models in historical languages exhibiting spatio-temporal variance as well as the significance of working between writing systems for language communities that have experienced language reform and script change.

Michael Piotrowski

Serial sources such as records, registers, and inventories are the ‘classic’ sources for quantitative history. Unstructured, narrative texts such as newspaper articles or reports were out of reach for historical analyses, both for practical reasons&nbsp;— availability, time needed for manual processing — and for methodological reasons: manual coding of texts is notoriously difficult and hampered by low inter-coder reliability. The recent availability of large amounts of digitized sources allows for the application of natural language processing, which has the potential to overcome these problems. However, the automatic evaluation of large amounts of texts — and historical texts in particular — for historical research also brings new challenges. First of all, it requires a source criticism that goes beyond the individual source and also considers the corpus as a whole. It is a well-known problem in corpus linguistics to determine the ‘balancedness’ of a corpus, but when analyzing the content of texts rather than ‘just’ the language, determining the ‘meaningfulness’ of a corpus is even more important. Second, automatic analyses require operationalizable descriptions of the information you are looking for. Third, automatically produced results require interpretation, in particular, when — as in history — the ultimate research question is qualitative, not quantitative. This, finally, poses the question, whether the insights gained could inform formal, i.e., machine-processable, models, which could serve as foundation and stepping stones for further research.