bluuebunny/crossref_metadata_2025 huggingface dataset:
11. Pouvoir, patronage et évergétisme à Chypre
Authors: Kantiréa Maria
Published: October 2020

Les interventions impériales, notamment d’’Auguste, de Tibère, des Flaviens, de Trajan et d’Hadrien, dans la province publique de Chypre résultaient de plusieurs facteurs relevant du pouvoir du prince, de l’image de bienfaiteur et de bâtisseur qu’il voulait se donner et de ses rapports avec les dieux et les cités. Financées par les empereurs ou par les autorités locales, les constructions édilitaires étaient supervisées par des proconsuls de Chypre et visaient à la romanisation de la province. Toutefois, bien que les provinciaux aient connu les modalités du patronage depuis 56 av. J.-C., ils ne semblent pas avoir établi de relations clientélaires avec les représentants de Rome. C’étaient surtout les notables locaux, dont le rôle sur le plan politique fut renforcé depuis la fondation du principat, qui s’étaient engagés dans le domaine de l’évergétisme et du culte impérial, contribuant ainsi à l’intégration « culturelle » de Chypre dans l’empire romain et assurant le loyalisme des provinciaux envers les institutions de Rome.
14. Heurs et malheurs de la prosopographie
Authors: Demougin Ségolène
Published: October 2020

Après une étude du terme « prosopographie », sont présentés les réussites et les échecs de cette discipline, en mettant l’accent sur l’identification des personnages et sur les destinées des familles de notables.
19. La constitutio de Scyris e l’insediamento dei barbari nell’impero
Authors: Rosafio Pasquale
Published: October 2020

La constitutio de Scyris del 409 rappresenta per noi la prima testimonianza certa dell’impiego dei barbari iure colonatus. Il panegirico di Costanzo Cloro del 297 sembra fare riferimento ad un uso dei Camavi e Frisi secondo una simile modalità. Si tratterebbe in questo caso di una attestazione dell’applicazione del principio derivante dall’introduzione della riforma fiscale appena introdotta all’inizio dell’età tetrarchica. In realtà il brano del panegirico non è altrettanto esplicito quanto la successiva costituzione imperiale. Anzi una più attenta analisi del testo fa pensare che siamo di fronte ad una diversa forma di impiego dei barbari sulla scia di una tradizione, già consolidata nel terzo secolo e ampiamente diffusa in tutto il corso del quarto, che vedeva i barbari installati come coltivatori e arruolati come soldati al servizio dell’impero. Sembra dunque più giusto spiegare la trasformazione dei prigionieri sciri in coloni sulla base delle circostanze storiche determinatesi tra la fine del quarto e gli inizi del quinto secolo.
21. Onomastique et société dans le monde romain
Authors: Raepsaet-Charlier Marie-Thérèse
Published: October 2020

Dans le monde romain, d’une part, la structure de la nomenclature reflète strictement le statut des personnes et, d’autre part, les dénominations des élites sont conditionnées par les appartenances familiales et les alliances ; dès lors, l’examen des noms de personne permet d’étudier différents aspects de l’histoire sociale. L’accent a été mis d’abord sur la prosopographie équestre et sénatoriale d’après quelques généalogies bien documentées ; ensuite, l’étude porte sur les phénomènes d’acculturation selon l’histoire des cités, dans le cadre de la répartition des citoyens et des pérégrins en Narbonnaise, Gaule Belgique et Germanie inférieure, puis dans celui de l’identité religieuse des dévots de Mars et de Mercure en Germanie supérieure.
23. Roman Imperial pasts
Authors: Dench Emma
Published: October 2020

Time, calendars and memory have been exciting topics in recent scholarship on Rome, but most treatments have either remained focused on the metropolis or characterized ‘Roman time’ as strongly interventionist. I consider the writing and commemoration of pasts as a broad phenomenon within cultures of the Roman empire, and examine some of the assumptions that lie behind these characterizations. How clear-cut are boundaries between ‘local’ and ‘Roman’ histories? Who has a stake in ‘Roman’ history, and to whom does ‘Roman’ history belong? How significant is the fact of Roman domination for the ways in which peoples conceptualize their past? Is there a division between ‘east’ and ‘west’ in patterns of ‘remembering’ or ‘forgetting’ pre-Roman pasts? The empire-wide study of ‘local’ and ‘Roman’ pasts suggests features specific to the Roman imperial experience. Recent scholarship on south Asia would characterize the interface between British and local histories as creative as well as destructive. What we do not see, however, is anything closely comparable to Roman subjects writing comprehensive histories of a Roman centre.
24. From norm to identity: Christians and Manichaeans in Codex Theodosianus XVI: separated by the law
Authors: Escribano María Victoria
Published: October 2020

In 380, Theodosius redefined the concept of religio in the Cunctos populos (CTh., XVI, 1, 2). Later, he had to expand the existing regulatory framework and specify who were entitled to use the nomen catholicorum christianorum and who were excluded from the privileges attached to it. In an endeavour to differentiate and identify the heretical groups that were liable to be punished because of their dissent from the fides catholica and thus facilitate the task of the judges in charge of enforcing the law, Theodosius’ chancery contributed to the creation of new legal categories and to the construction of religious identities. In this course from norm to identity, the nomen Manichaeorum took on precise features as an expression of alterity with regards to the nomen christianum since 381, despite the fact that the followers of Mani’s doctrines presented themselves as the true Christians. The purpose of this paper is to analyze the first Theodosian laws against Manichaeans in order to illustrate the part played by imperial regulation in the construction of identities and the various forms in which this contribution was made.
Les historiens et le mythe de Versailles en Europe, des années 1960 à nos jours
Authors: Leroux Flavie
Published: October 2020

« Le rayonnement de Versailles », dans l’Europe voire dans le monde, a longtemps été considéré comme acquis dans l’historiographie. Cette idée est étayée par les travaux des historiens, notamment français (Louis Réau, au premier chef), et relayée par plusieurs de leurs homologues à l’étranger, jusqu’au milieu, au moins, du xxe siècle. Elle participe à ériger Versailles en modèle pour les autres cours d’Europe et, ce faisant, contribue à sa mythification. L’enjeu de cet article est de revenir sur cette construction idéelle et scientifique : dans quelle mesure l’historiographie s’est-elle appuyée sur une idée fantasmée de Versailles et, inversement, comment a-t-elle contribué à l’entretenir ? Il s’agit également de restituer les évolutions de ce paradigme, en particulier ses remises en cause, afin de saisir comment les historiens l’ont progressivement disqualifié. Des premières critiques empiriques des années 1960-1970 à l’histoire des représentations, en passant par les transferts culturels et les Court Studies, retour sur plus d’un demi-siècle de réflexion scientifique pour mieux éclairer la recherche présente et à venir.
Human disease caused by Streptococcus alactolyticus: a case report of native valve infective endocarditis and review of the literature
Authors: Mylonas Charalampos Chrysanthos , Gomatou Georgia , Poulakou Garyphallia , Moraitou Eleni , Syrigos Konstantinos
Published: October 2020

Streptococcus alactolyticus, a member of the Streptococcus bovis/Streptoccus equinus complex, is primarily hosted in the gastrointestinal tract of animals and rarely of humans, with only scarce reports relating to human disease. We herein present a case of subacute infective endocarditis (IE) caused by S. alactolyticus in a 64-year old male with pre-existing mitral prolapse. Despite a 10-month history of low-grade fever and weight loss, the diagnosis of IE was triggered by left quadrant abdominal pain which revealed splenic infarcts on computed tomography. A definitive diagnosis of IE was subsequently established by four consecutive blood cultures positive for S.alactolyticus plus demonstration of a vegetation on the mitral valve by trans-esophageal ultrasound. Further workup revealed multiple embolic phenomena including brain and spine. A dental abscess was identified as the most probable origin of the bacteraemia, while colonoscopy revealed no evidence of cancer. The patient recovered uneventfully with antibiotic treatment and underwent successful cardiac surgery post-discharge. Although rare, IE caused by S. alactolyticus may be severe and of obscure origin; oral cavity should not be overlooked as a possible origin. Attention should be given in patients with preexisting risk factors.
Clinical profile & long-term natural history of symptomatic coronary artery disease in young patients (<30 yr)
Authors: Gopalakrishnan Arun , Sivadasanpillai Harikrishnan , Ganapathi Sanjay , Mohanan Nair Krishna Kumar , Sivasubramonian Sivasankaran , Valaparambil Ajitkumar
Published: October 2020

Background & objectives:

Several studies have shown a high prevalence of cardiovascular risk factors in patients in the age group of 30-74 yr, but there is a paucity of data in young patients below 30 yr. We analyzed the clinical and coronary angiographic profile of patients <30 yr of age with symptomatic coronary artery disease (CAD) and also assessed their intermediate and long-term outcomes.

Methods:

All patients less than 30 yr of age who presented with symptomatic CAD from 1978 to 2017 in the department of Cardiology of a tertiary care hospital in south India, were studied for coronary risk factors and angiographic and treatment patterns, and the follow up data were collected.

Results:

The mean age of the 159 patients <30 yr of age was 26.7±3.29 yr. Male preponderance was observed (91.8%), 63.5 per cent patients were smokers and 88.3 per cent were dyslipidaemic. Acute myocardial infarction was the most common mode of presentation. Forty one per cent patients were non-adherent to medications. Risk factor control was inadequate with respect to smoking cessation, alcoholism, physical activity and dietary regulation. The predictors of long-term mortality were multivessel CAD [hazard ratio (HR): 1.927, 95% confidence interval (CI): 1.003-3.701] and reduction in ejection fraction (EF) (10% decrease in EF; HR: 1.349, 95% CI: 1.096-1.662). Overall mortality was 30 per cent at 10 yr and 48 per cent at 20 yr.

Interpretation & conclusions:

Decreasing EF and multivessel involvement were found to be the strong correlates for long-term mortality in young patients below 30 yr of age with CAD. High long-term mortality rates and poor risk factor control suggest the vast scope for the improvement of outcomes in these patients with aggressive risk factor control.
Study of fine-needle aspiration microbiology versus wound swab for bacterial isolation in diabetic foot infections
Authors: Abdulbasith K.M. , Bhaskar Maanasa M. , Munisamy Malathi , Nagarajan Raj Kumar
Published: October 2020

Background & objectives:

Proper identification of the infection causing microbe in diabetic foot infections (DFIs) is essential for starting appropriate treatment. The objectives of this study were to compare fine-needle aspiration microbiology (FNAM) with wound swab as methods of sample collection in isolating microorganisms causing DFIs and also to compare the microbiological profile and sensitivity pattern of the infecting organisms.

Methods:

This study was conducted targeting all consecutive patients with DFIs with perfusion, extent, depth, infection and sensation (PEDIS) grade 2, 3, and 4 infections admitted in the department of Surgery of a tertiary care hospital in south India during July to August 2017. A superficial wound swab and an FNAM were collected from all the patients. These swabs are analyzed using standard microbiological techniques.

Results:

Eighty patients with DFI were included. Bacterial culture using FNAM samples yielded growth in 58.75 per cent samples, whereas wound swab samples yielded growth in 93.8 per cent cultures done. Measure of agreement between the two techniques using Kappa statistics was 0.069 (P=0.28).

Interpretation & conclusions:

In diabetic wound infections, wound swabs were sufficient to identify organisms in all grades of infection. However, in deeper infections (grade 3 and 4), FNAM would be a reliable investigation than wound swab.
Quality of anticoagulation with warfarin in rural Chhattisgarh, India
Authors: Chebrolu Puja , Patil Sushil , Laux Timothy S. , Al-Hammadi Noor , Jain Yogesh , Gage Brian
Published: October 2020

Background & objectives:

In most of rural India, warfarin is the only oral anticoagulant available. Among patients taking warfarin, there is a strong association between poor control of the international normalized ratio (INR) and adverse events. This study was aimed to quantify INR control in a secondary healthcare system in rural Chhattisgarh, India.

Methods:

The INR data were retrospectively obtained from all patients taking warfarin during 2014-2016 at a secondary healthcare system in rural Chhattisgarh, India. Patients attending the clinic had their INR checked at the hospital laboratory and their warfarin dose adjusted by a physician on the same day. The time in therapeutic range (TTR) was calculated for patients who had at least two INR visits.

Results:

The 249 patients had 2839 INR visits. Their median age was 46 yr, and the median body mass index was 17.7 kg/m2. They lived a median distance of 78 km (2-3 h of travel) from the hospital. The median INR was 1.7 for a target INR of 2.0-3.0 (n=221) and 2.1 for a target of 2.5-3.5 (n=28). The median TTR was 13.0 per cent, and INR was subtherapeutic 66.0 per cent of the time. Distance from the hospital was not correlated with TTR.

Interpretation & conclusions:

INR values were subtherapeutic two-thirds of the time, and TTR values were poor regardless of distance from the health centre. Future studies should be done to identify interventions to improve INR control.
Risk of type 2 diabetes mellitus among urban slum population using Indian Diabetes Risk Score
Authors: Nittoori Sreeja , Wilson Vidhya
Published: October 2020

Background and objectives:

Diabetes has emerged as a major health challenge in India due to a rapid rise in the number of diabetes cases. Early identification of high risk individuals through screening and early interventions in the form of lifestyle modifications and treatment would help in the prevention of diabetes and its complications. This study was done to assess the risk of type 2 diabetes mellitus (T2DM) in an urban slum population using the Indian Diabetes Risk Score (IDRS) and to determine the factors associated with high risk score.

Methods:

A community-based cross-sectional study was conducted among the urban slum population in North Telangana, India. A total of 136 study participants were selected randomly from the records. A pre-designed and pre-tested structured questionnaire was used for data collection. Assessment of risk of T2DM was done using the IDRS.

Results:

Of the 136 study participants, 101 (74.3%) were at high risk (IDRS ≥60) followed by 32 (23.5%) at moderate risk (IDRS 30-50) and three (2.2%) at low risk (IDRS <30). Sixty two (92.5%) individuals in the age group ≥50 yr were at high risk compared to 34 (63%) in 35-49 yr age group. Most (n=35, 87.5%) of sedentary workers were at high risk compared to those employed in moderate (n=52, 75.4%) and strenuous work (n=14, 51.9%).

Interpretation & conclusions:

Nearly three-fourth (74.3%) of the study participants were at a high risk of developing T2DM. Age, type of occupation, abdominal obesity, general obesity and high blood pressure were the factors significantly associated with high risk IDRS score.
Immunological markers for identifying recent HIV infection in North-West India
Authors: Chauhan Chandar Kanta , Lakshmi P.V.M. , Sagar Vivek , Sharma Aman , Arora Sunil K. , Kumar Rajesh
Published: October 2020

Background & objectives:

Being more efficient and widely used, limiting antigen (LAg)-avidity enzyme immunoassay (EIA) based on the recent infection testing algorithm (RITA) has been developed for differentiating recent and established HIV-1 infection. So far, LAg-avidity EIA has not been validated among the Indian population. Hence, the present study was planned to identify recent HIV infections in high risk patients in the North-West region of India using modified LAg-avidity RITA.

Methods:

Four hundred HIV-positive high risk patients registered on pre-antiretroviral therapy (ART) programme in the last one year, from five ART centres in North-Western States of India, were included for identifying the recent HIV infections. One hundred HIV-positive cases registered for pre-ART for greater than two years in ART centres were included for estimating false recent rate (FRR). Single-well LAg-avidity EIA-based modified RITA was used to identify recent HIV infection cases.

Results:

Of the 400 HIV-1-positive samples, 64 (16%) were found to have been infected within the past 130 days. The proportion of recent HIV infections was 16.8 per cent (18/107) among female sex workers, 10.7 per cent (9/84) among men who have sex with men and 17.7 per cent (37/209) among injecting drug users. The FRR was one per cent (1/100).

Interpretation & conclusions:

LAg-avidity EIA-based modified RITA provided good discrimination between recent and non-recent HIV infection, hence, it could be considered suitable for estimating HIV incidence in sentinel surveillance system in India.
Prevalence of red blood cell antibodies in whole blood donors
Authors: Solanki Archana , Chandra Tulika , Singh Ashutosh
Published: October 2020

Background & objectives:

Blood transfusion therapy involves multiple steps to ensure selection of safe blood component for transfusion. This includes testing for infectious markers, full ABO compatibility, free from any clinically significant red cell antibodies and acceptable donor's red cell survival rates without destruction of recipient's red cells. The red cell antibodies present in healthy blood donors can cause severe haemolytic transfusion reaction, especially in massive blood transfusion recipients and paediatric patients. Hence, screening of red cell antibodies in donor blood is important to provide compatible blood products and to avoid haemolytic transfusion reactions in susceptible patient population. This study was planned to assess prevalence, aetiology and type of unexpected red cell antibodies in a large number of whole blood donor population in north India.

Methods:

This three-year prospective observational study included blood donor samples for antibody screening from January 2015 to December 2017. A total of 166,803 healthy blood donors including 156,128 (93.6%) males and 10,675 (6.4%) females were screened.

Results:

The prevalence of red cell antibodies was 0.17 per cent in our donor population. Of the total 286 donors with red cell antibodies, 248 (86.7%) had alloantibodies, 30 (10.5%) had autoantibodies and eight donors (2.8%) showed positive antibody screening with inconclusive results.

Interpretation & conclusions:

Alloimmunization to red cell antigens is a challenging task for current transfusion practices. The antibody screening in blood donors may improve the quality and safety of blood transfusion in the recipients. It also reduces the risk of complications from incompatible blood transfusions.
Effect of zinc supplementation on relative expression of immune response genes in neonates with sepsis
Authors: Banupriya Newton , Bhat Ballambattu Vishnu , Vickneshwaran Vinayagam , Sridhar Magadi Gopalakrishna
Published: October 2020

Background & objectives:

Zinc alters gene expression mainly by binding to a site on the transcription factor. Genome-wide expression studies have shown early repression of genes related to zinc and immunity in adult patients with sepsis. The present study was conducted to evaluate the role of zinc supplementation on relative expression of immune response genes in neonatal sepsis.

Methods:

In the present study, a sample of convenience of 22 neonates each was selected from the zinc supplemented and control groups using random numbers for expression of immune-related genes by zinc supplementation. These neonates with sepsis were earlier randomized into two groups: with and without zinc supplementation in addition to standard antibiotics and supportive care. Relative expression of immune response genes were analyzed for 22 neonates in each group using quantitative real-time PCR for calprotectin (S100A8/A9), tumor necrosis factor-alpha (TNF-α), interleukin-6 (IL-6), toll-like receptor-4 (TLR-4), cluster of differentiation 14 (CD14) and lipopolysaccharide-binding protein (LBP) genes.

Results:

An increase in serum zinc levels was observed in zinc-supplemented group compared to controls. S100A8 gene showed downregulation by three-fold (P<0.001) and S100A9 gene showed upregulation by two-fold (P<0.05) in zinc group compared to controls. CD14 gene showed upregulation by one-fold in zinc-supplemented group compared to controls (P<0.05). No significant fold changes were observed with respect to TNF-α, IL-6, LBP and TLR-4 genes between the two groups.

Interpretation & conclusions:

The results of our preliminary study showed that the zinc supplementation might modulates the relative expression of immune-related genes involved in sepsis pathway among neonates. However, studies with larger sample size are needed to be done to provide a better picture on the outcome by gene expression in neonatal sepsis by zinc supplementation.
Epidemiology, diagnosis & treatment of non-tuberculous mycobacterial diseases
Authors: Sharma Surendra K. , Upadhyay Vishwanath
Published: October 2020

Non-tuberculous mycobacteria (NTM) are ubiquitously present in the environment, but NTM diseases occur infrequently. NTM are generally considered to be less virulent than Mycobacterium tuberculosis, however, these organisms can cause diseases in both immunocompromised and immunocompetent hosts. As compared to tuberculosis, person-to-person transmission does not occur except with M. abscessus NTM species among cystic fibrosis patients. Lung is the most commonly involved organ, and the NTM-pulmonary disease (NTM-PD) occurs frequently in patients with pre-existing lung disease. NTM may also present as localized disease involving extrapulmonary sites such as lymph nodes, skin and soft tissues and rarely bones. Disseminated NTM disease is rare and occurs in individuals with congenital or acquired immune defects such as HIV/AIDS. Rapid molecular tests are now available for confirmation of NTM diagnosis at species and subspecies level. Drug susceptibility testing (DST) is not routinely done except in non-responsive disease due to slowly growing mycobacteria (M. avium complex, M. kansasii) or infection due to rapidly growing mycobacteria, especially M. abscessus. While the decision to treat the patients with NTM-PD is made carefully, the treatment is given for 12 months after sputum culture conversion. Additional measures include pulmonary rehabilitation and correction of malnutrition. Treatment response in NTM-PD is variable and depends on isolated NTM species and severity of the underlying PD. Surgery is reserved for patients with localized disease with good pulmonary functions. Future research should focus on the development and validation of non-culture-based rapid diagnostic tests for early diagnosis and discovery of newer drugs with greater efficacy and lesser toxicity than the available ones.
Evaluation of multiparametric flow cytometry in diagnosis & prognosis of myelodysplastic syndrome in India
Authors: Dhingra Gaurav , Dass Jasmita , Arya Vandana , Gupta Nitin , Saraf Amrita , Langer Sabina , Aggarwal Shyam , Kotwal Jyoti , Bhargava Manorama
Published: October 2020

Background & objectives:

Diagnosis of myelodysplastic syndromes (MDS) is subjective in low-grade cases with <5 per cent blasts or <15 per cent ring sideroblasts. Flow cytometry (FCM) has been used to diagnose MDS; but, it still has only an adjunctive role. This study was conducted to evaluate the role of FCM to diagnose MDS and correlate the number of aberrancies with revised international prognostic scoring system (R-IPSS).

Methods:

This study included 44 consecutive clinically suspected cases of MDS with refractory cytopenia(s) and 10 controls. Patients were divided into two groups: (i) proven MDS cases (n=26), and (ii) suspected MDS (n=18). Ogata quantitative approach, pattern analysis and aberrant antigen expression were studied.

Results:

Ogata score ≥2 correctly diagnosed 80.7 per cent (21/26) while aberrant antigen and pattern analysis with flow score of ≥3 could diagnose 92.3 per cent (24/26) patients with proven MDS. Combination of both with flow score ≥3 could diagnose 100 per cent patients. Eight patients in suspected MDS group with persistent cytopenia on follow up were labelled as probable MDS. Ogata score ≥2 was present in 5 of 8 and pattern analysis score ≥3 was present in six probable MDS patients. Combination of both with flow score ≥3 was present in seven of eight patients. Spearman's correlation between Ogata score and R-IPSS, pattern analysis and R-IPSS and combination of both scores and R-IPSS showed significant positive correlation in proven MDS as well as when proven and probable MDS patients were combined.

Interpretation & conclusions:

Our results showed that combined Ogata approach and pattern analysis, demonstration of ≥3 aberrancies in >1 cell compartment could diagnose most MDS patients. Patients with high flow scores had high R-IPSS scores. Patient with flow score ≥3 and borderline cytomorphology should be observed closely for the development of MDS.
Динамика кривошипно-шатунного механизма под действием давления вязкого газа
Authors: Плотников Павел Игоревич , Plotnikov Pavel Igorevich , Соколовски Ян , Sokolowski Jan
Published: October 2020

Изучается начально-краевая задача со свободной границей для одномерных уравнений динамики вязкого газа. Рассматриваемая задача моделирует движение кривошипно-шатунного механизма под действием давления газа. Предполагается, что газ заполняет цилиндр, который моделируется отрезком $[0,1]$. Внутри цилиндра перемещается поршень, который моделируется переменной точкой $a(t)\in [0,1]$. Кроме того, предполагается, что поршень соединен с плоским трехзвенным кривошипно-шатунным механизмом. На границе цилиндра задается распределение скорости. На участках втекания газа дополнительно задается распределение плотности. Движение газа описывается одномерными уравнениями Навье-Стокса динамики вязкой сжимаемой жидкости. Требуется определить совместное движение газа и кривошипно-шатунного механизма. Доказывается, что эта задача имеет слабое ренормализованное решение.
Квазиклассическая асимптотика решения задачи Коши для уравнения Шрeдингера с дельта-потенциалом, локализованным на поверхности коразмерности 1
Authors: Шафаревич Андрей Игоревич , Shafarevich Andrei Igorevich , Щегорцова Ольга Александровна , Shchegortsova Olga Alexandrovna
Published: October 2020

Описана квазиклассическая асимптотика решения задачи Коши для уравнения Шрeдингера с дельта-потенциалом, локализованным на поверхности коразмерности $1$. Начальное условие представляет собой быстро осциллирующий волновой пакет. Показано, что асимптотика выражается через канонический оператор Маслова на паре лагранжевых многообразий в расширенном фазовом пространстве; вид дельта-потенциала определяет отображение между этими многообразиями, описывающее отражение и рассеяние волнового пакета.
Об устойчивости системы двух одинаковых точечных вихрей и цилиндра
Authors: Борисов Алексей Владимирович , Borisov Alexey Vladimirovich , Куракин Леонид Геннадиевич , Kurakin Leonid Gennadievich
Published: October 2020

Рассматривается задача устойчивости системы двух одинаковых точечных вихрей и кругового цилиндра, расположенного посередине между ними. Циркуляция вокруг цилиндра равна нулю. В задаче два параметра: присоединенная масса цилиндра $a$ и $q=R^2/R_0^2$, где $R$ - радиус цилиндра, а $2R_0$ - расстояние между вихрями. Исследованы матрица линеаризации и квадратичная часть гамильтониана задачи. Найдены условия орбитальной устойчивости и неустойчивости в нелинейной постановке. Указаны области параметров, при которых имеет место линейная устойчивость и требуется нелинейный анализ. Результаты при $a\to \infty $ согласуются с классическими для закрепленного цилиндра. Показано, что подвижность цилиндра приводит к расширению области устойчивости.
Дискретные геодезические потоки на многообразиях Штифеля
Authors: Йованович Божидар , Jovanovic Boidar , Федоров Юрий Николаевич , Fedorov Yurii Nikolaevich
Published: October 2020

Изучаются интегрируемые дискретизации геодезических потоков евклидовых метрик на кокасательных расслоениях многообразий Штифеля $V_{n,r}$. В частности, для $n=3$, $r=2$ после отождествления $V_{3,2}\cong \mathrm {SO}(3)$ мы получаем дискретный аналог случая Эйлера движения твердого тела, соответствующий оператору инерции $I=(1,1,2)$. Кроме того, рассматриваются отображения бильярдного типа; одно из них оказывается "квадратным корнем" дискретной системы Неймана на $V_{n,r}$.
Использование дифференциальных свойств обобщенных мер Лебега-Фейнмана при исследовании квантовых аномалий
Authors: Гоф Джон Эдвард , Gough John Edward , Ратью Тюдор Стефан , Ratiu Tudor Stefan , Смолянов Олег Георгиевич , Smolyanov Oleg Georgievich
Published: October 2020

Обсуждается проблема происхождения квантовых аномалий, для которой сравнительно недавно в монографиях были предложены противоречащие друг другу решения. Предлагаемый в настоящей работе подход является новым; он использует дифференциальные свойства обобщенных мер. Для определения таких мер вводится пространство пробных функций, определенных на локально выпуклом топологическом векторном пространстве, что позволяет ввести понятие логарифмической производной соответствующих обобщенных мер. В частности, показано, что квантовые аномалии получают естественное объяснение в терминах дифференциальных свойств обобщенной меры Лебега-Фейнмана (или соответствующего интеграла Фейнмана по траекториям). В тех же терминах дается точное определение квантовых аномалий.
Некоторые результаты о вынужденных колебаниях в механических системах
Authors: Полехин Иван Юрьевич , Polekhin Ivan Yur'evich
Published: October 2020

Приводятся достаточные условия существования вынужденных колебаний в неавтономных механических системах. Ранее аналогичные результаты были получены при условии наличия в системе трения. Представленные результаты верны как для систем с трением, так и для систем без трения. Общие утверждения иллюстрируются примерами.
Разбиение $n$-мерного евклидова пространства на описанные $n$-кубоиды
Authors: Драгович Владимир Ильич , Dragovich Vladimir Il'ich , Раноменджанахари Роже Фидель , Ranomenjanahary Roger Fidele
Published: October 2020

В 1970 г. Бeм сформулировал трехмерную версию своей двумерной теоремы о том, что деление плоскости прямыми на описанные четырехугольники обязательно состоит из касательных прямых к данной конике. Бeм не представил доказательство своего трехмерного утверждения. Цель данной работы - дать доказательство трехмерного утверждения Бeма о том, что деление трехмерного евклидова пространства плоскостями на описанные кубоиды состоит из трех семейств плоскостей таких, что все плоскости в одном и том же семействе пересекаются вдоль прямой, а три прямые компланарны. Доказательство основано на свойствах центров подобия. Представлены также обобщения утверждения Бeма на четырехмерный, а затем $n$-мерный случаи, и приведены соответствующие доказательства.
Дискретизация обыкновенных коммутирующих дифференциальных операторов ранга 2 в случае эллиптических спектральных кривых
Authors: Маулешова Гульнара Сайновна , Mauleshova Gulnara Sainovna , Миронов Андрей Евгеньевич , Mironov Andrei Evgen'evich
Published: October 2020

Исследуются одноточечные коммутирующие разностные операторы ранга $2$. Устанавливается взаимосвязь между этими операторами и коммутирующими дифференциальными операторами ранга $2$ в случае эллиптических спектральных кривых.
Локальные адиабатические инварианты в окрестности гомоклинического множества быстро-медленной гамильтоновой системы
Authors: Болотин Сергей Владимирович , Bolotin Sergey Vladimirovich
Published: October 2020

В быстро-медленных системах быстрые переменные меняются со скоростью порядка единицы, а медленные со скоростью порядка $\varepsilon \ll 1$. Система, получающаяся при $\varepsilon =0$, называется замороженной. Если замороженная (быстрая) система имеет одну степень свободы, то в области, где линии уровня замороженного гамильтониана - замкнутые кривые, существует адиабатический инвариант. А. Нейштадт показал, что вблизи сепаратрисы замороженной системы адиабатический инвариант испытывает квазислучайные скачки порядка $\varepsilon $. В данной работе результаты Нейштадта частично переносятся на многомерный случай. Показано, что если замороженная система имеет гиперболическую критическую точку и существует несколько трансверсальных гомоклинических траекторий, то при малых $\varepsilon $ существуют траектории, отслеживающие цепочки гомоклиник. Медленные переменные эволюционируют квазислучайным образом, отслеживая траектории систем с гамильтонианами, аналогичными адиабатическим инвариантам. Данная работа продолжает исследования В. Гельфрейха и Д. Тураева, рассматривавших аналогичные явления далеко от критических точек замороженного гамильтониана.
О нестационарном пограничном слое вязкой реологически сложной жидкости
Authors: Булатова Регина Рашидовна , Bulatova Regina Rashidovna , Самохин Вячеслав Николаевич , Samokhin Vjacheslav Nicolaevich , Чечкин Григорий Александрович , Chechkin Gregory Aleksandrovich
Published: October 2020

Рассматривается нестационарная система уравнений типа Прандтля, описывающая поведение пограничного слоя вязкой несжимаемой жидкости, в модификации О.А. Ладыженской. Доказывается теорема существования и единственности как в декартовых координатах, так и в переменных Крокко.
Гамильтониан в теории ведущего центра: подход на основе симплектической структуры
Authors: Нейштадт Анатолий Исерович , Neishtadt Anatolii Iserovich , Артемьев Антон Владимирович , Artemyev Anton Vladimirovich
Published: October 2020

Приближение ведущего центра широко используется при исследовании движения заряженных частиц в сильных магнитных полях. Это приближение основано на сохранении адиабатического инварианта - магнитного момента. Гамильтоновы уравнения для движения ведущего центра традиционно вводятся с использованием неканонической симплектической структуры. При этом подходе приходится применять неканоническую гамильтонову теорию возмущений для вычисления поправок к магнитному моменту. В настоящей работе излагается альтернативный подход, приводящий к каноническим гамильтоновым уравнениям для движения ведущего центра в нестационарных электромагнитных полях. В соответствующей канонической симплектической структуре разделены пары сопряженных переменных, отвечающих трем типам движения: гировращению, движению вдоль магнитного поля и дрейфу поперек магнитного поля. Полученная форма гамильтониана и симплектической структуры допускает простое введение адиабатического инварианта и может быть полезна при исследовании различных плазменных систем.
Существование оптимальных стационарных состояний эксплуатируемых популяций с диффузией
Authors: Давыдов Алексей Александрович , Davydov Alexey Alexandrovich
Published: October 2020

Изучается динамика популяции с диффузией, доставляемая параболическим уравнением с логистическим членом реакции, при наличии эксплуатации - постоянном отборе части плотности популяции. При естественных ограничениях на параметры модели доказано существование устойчивого стационарного состояния популяции, доставляющего наибольшую выгоду от эксплуатации в натуральном виде.
Efectele tehnologiilor de exploatare a lemnului asupra unor parametri fizici ai solurilor forestiere montane
Authors: Barbu Ion
Published: October 2020

Lucrarea tratează impactul diferitelor tehnici de exploatare a lemnului asupra parametrilor solului din pădurile de molid din Carpații Orientali - România. Experimentele au fost făcute pe soluri formate pe două substraturi geologice (șisturi cristaline și fliș) și arată schimbările produse asupra densității aparente, a umidității solului și asupra timpului de infiltrare a coloanei de apă de 100 mm, în cazul a două modalități de recoltare a lemnului: cu ajutorul tractoarelor grele și exploatare forestieră cu cai. Măsurătorile efectuate cu metode standardizate arată creșterea densității aparente a solurilor până la adâncimea de 30-40 cm. Pe solurile argilo-nisipoase densitatea aparentă crește de la 0,6 g/cm3 la 1,15 g/cm3 în primii 15 cm. Pe solurile dezvoltate pe fliș, densitatea aparentă crește în primii 5 cm de la 0,6 g/cm3 la 0,84 g/cm3. Timpul de infiltrare al unei coloane de apă de 100 mm crește de 10-15 ori, în principal pe solurile dezvoltate pe fliș la 1-10 cm. La 20 cm în sol, timpul de infiltrare crește de 3-3,6 ori pe drumurile de tractor și de 1-1,2 ori sub drumurile de exploatare cu caii. Sunt discutate consecințele compactării solului asupra solurilor și pădurilor și sunt propuse unele măsuri pentru reducerea impactului.
Activități Forestiere Ilegale și Părți Interesate. Două concepte utile pentru reconstrucția unei politici publice de contracarare a fenomenului „tăierilor ilegale”
Authors: Bălăcescu Cristian
Published: October 2020

Concentrată pe fenomenul exploatărilor ilegale de pădure din România, cercetarea actuală se ancorează în disciplina politicilor publice, dorind să intervină în procesul de re-definire a problemei.  Ambele obiective ale studiului sunt legate de această etapă a ciclului: A. identificarea activităților forestiere ilegale (conținutul problemei) și B. identificarea și verificarea părților interesate ambele elemente fiind specifice României. Ca metodologii au fost utilizate analiza documentară, analiza conținutului și tehnica interviului (pentru A) și tehnica „snow-ball” aplicată unui eșantion media on-line (pentru B). Pentru etapa de analiză a stakeholderilor a fost propus un model nou, „Tipologia Rolului Propus în Proiect” (TRPP) care permite celui care formulează politica publică să apropie rolurile stakeholderilor de cele mai importante caracteristici ale acestora: puterea și interesele, aspect esențial în cadrul fazei de implementare a măsurilor.  În secundar au fost notate anumite limite ale PNCTIA, considerată prima (și singura) propunere de politici publice dezvoltată de autoritatea forestieră centrală.
Despre procesul de formare a ecosistemului forestier
Authors: Doniță Nicolae
Published: October 2020

În curând
Mispricing and Investor Preference with Six Indicators of Blue-Chip Stocks’ Future Returns
Authors: Lubis Iman , Syamruddin Syamruddin , Irwansyah Irwansyah
Published: October 2020

This research involves three variables: future returns, mispricing, and investor preference. The issue is that future returns in the markets are difficult to understand, especially for beginner, amateur investors. They are advised to focus on blue-chip stocks due to their safety in the market. The objective of this research is to find a connection from mispricing and investor preference to the future anomalies as indicators of mispricing and ten measurements as indicators of investor preference leading to three anomalies of mispricing and three measurements of investor preference. The three anomalies are asset growth, net operating assets, and total returns of blue-chip stocks. The methods used are descriptive statistics and associative statistics. In this research, we adopted eleven liabilities to total assets, while the three investor preferences are beta synchronous trading, book equity to market equity, and size. The descriptive statistics show that the asset growth, net operating asset, and size of eight companies are above the mean and the others are below it. Blue-chip stocks have excellent growth in assets, high operating assets, and high market capitalization. In addition, they have low liabilities (solvable), book value to market value (high return), and beta (low market sensitivity). The associative statistics used the multiple-regression cross-section Newey–West method and conducted the examination three times; that is, it tested mispricing with three indicators, investor preference with three indicators, and additional indicators between mispricing and investor preference. The result is not significant for the investor preference and mispricing index for the future returns of blue-chip stocks. The policy implication is that there is no divergence between fundamental and price security in the types of blue-chip stocks for future returns. Moreover, the institutional or individual investor does not impact future return’s stocks.
Engaging Halal Lifestyle toward Purchase Intention of Event Marketing : A Study on Car Free Day Activities in Aceh
Authors: Yusniar Yusniar , Saputra Jumadil , Tebec Yuni Gemasih , Suhairid Laili
Published: October 2020

This study aims to be able to test and analyze the effect of halal lifestyle, price and location on purchase intention in the activities of the Banda Aceh City Car Free Day. The method used is quantitative with Non Probability Sampling in the form of purposive sampling. The data used is primary data, which is obtained directly from the object to be studied in the form of respondents' perceptions by circulating a list of questions in the form of a questionnaire to 100 respondents. Data were analyzed using multiple linear regression statistical tools. The partial test results show that the location variable does not have a positive and significant effect on purchase intention, while the price and halal lifestyle have a positive effect on purchase intention. The simultaneous test results also show that location, price and halal lifestyle variables have a positive and significant effect on purchase intention in the Banda Aceh City Car Free Day activities.
Transversalidad axiológica curricular y ecoactitudes en estudiantes de ingeniería de una universidad privada, Trujillo
Authors: Valverde Zavaleta Silvia
Published: October 2020

La investigación Transversalidad axiológica Curricular y Ecoactitudes en los estudiantes de Ingeniería de una universidad privada, se planteó como objetivo general describir la relación que hay entre la variable Transversalidad axiológica curricular y la variable Ecoactitudes. El tipo de investigación es no experimental con diseño descriptivo correlacional. La muestra estuvo constituida por 79 estudiantes de segundo ciclo de estudios de Ingeniería Civil, Ambiental, Industrial y Mecánica Eléctrica. Se aplicó la técnica de la encuesta administrándose el Cuestionario de opinión acerca de la Transversalidad axiológica curricular y de Ecoactitudes como instrumentos de recopilación de información, validado por juicio de expertos en el campo educativo, y para determinar la confiabilidad se aplicó a un grupo piloto de estudiantes registrando un valor de Alfa de Cronbach 0. 775 y 0. 803 respectivamente. Los resultados abordados registraron que la Transversalidad axiológica curricular correlaciona con las dimensión actitud ante los recursos (,250*) de la variable Ecoactitud, y la variable Ecoactitud correlaciona con las dimensión solidaridad (,250*) y responsabilidad (,322**) de la variable Transversalidad axiológica curricular. El desarrollo del estudio permitió concluir en establecer una relación significativa entre la transversalidad curricular axiológica y ecoactitudes (0,253) en los estudiantes universitarios de II ciclo de ingeniería, con un p-valor menor que el nivel de significancia estándar (p<0,05), por lo tanto, existe evidencia estadística para rechazar la hipótesis nula.
Organizadores gráficos para el aprendizaje significativo en estudiantes de primaria de Acoyó - Huaylas
Authors: Moreno Maguiña José Viterbo
Published: October 2020

Como propósito de la presente investigación, se llegó a establecer que los organizadores gráficos mejoraron el aprendizaje significativo en las diferentes Áreas Curriculares: de Matemática, Comunicación, Personal Social, Ciencia y Tecnología como Religión; de los estudiantes del quinto grado de primaria en la Institución Educativa N°86498 de Acoyó, Distrito de Pueblo Libre, Provincia de Huaylas, Departamento de Ancash. El tipo de investigación es pre experimental, debido a que se aplicó un programa experimental por espacio de diez sesiones de aprendizaje con el uso de los organizadores gráficos antes de administrar el pre test y luego de la ejecución del programa se tomó un pos test, para la confiabilidad del instrumento de medición se empleó Alfa de Cronbach, y para la comprobación de hipótesis se utilizó la prueba de rangos de Wilcoxon para muestras relacionadas. La población y muestra lo conformaron catorce estudiantes. Como técnica se empleó una encuesta y como instrumento se manejó un cuestionario. Para el procesamiento y análisis de la información se empleó la estadística descriptiva, y el SPSS versión 21.Como resultado de la investigación, se comprobó que el uso de los organizadores gráficos sí mejora el aprendizaje significativo en los estudiantes de educación primaria, al obtener una media en el pre test de 10.64 y en el pos test una media de 14.23 con una diferencia de medias de 3, 59; del cual se obtiene una t de 8,886 con 13 grados de libertad y con un nivel de significancia de 0,000 que es menor a 0.05 del cual inferimos que el programa de los organizadores gráficos mejoró significativamente el aprendizaje de los estudiantes.
Crisis del estado democrático de derecho y propuesta de control del poder político parlamentario
Authors: Mendoza Rodríguez John Michael
Published: October 2020

El presente trabajo de investigación, crítica el desenvolvimiento actual de la política nacional, no olvidándose de los principales acontecimientos políticos y su repercusión frente a la sociedad, por ello es nuestra preocupación en cuanto el ejercicio de un poder desmedido por parte de los representantes políticos (parlamentarios) que sin sujeción a control técnico, en nombre de la democracia representativa, causan el peor detrimento de aquellos derechos elementales de la ciudadanía. Por tanto, ante la circunstancias de crisis de un Estado de Derecho, se presenta esta investigación que con el fin de aportar ideas que refuercen los postulados de la institucionalidad de representación popular, bajo parámetros constitucionales y se construya una democracia constitucional sujeto a los parámetros deun Estado Democrático de Derecho, donde el principal actor que direccione el poder del pueblo no sea un órgano representativo reducido y concentrado sino un órgano controlador desconcentrado dirigido desde la sociedad.
Barreras de la educación superior no presencial y el aprendizaje significativo
Authors: Tapia Díaz Jessie Catherine
Published: October 2020

El propósito de la investigación es determinar si existe relación entre “las barreras de la educación superior no presencial” y “el aprendizaje significativo” de los estudiantes de una universidad particular de Trujillo. Según su fin es una investigación básica, descriptiva correlacional, donde se aplicaron el método Hipotético – Deductivo, de diseño de contrastación no experimental de corte transversal o transaccional. Los resultados presentaron una correlación negativa alta de -0.882, lo que indica que la “Barreras de educación superior no presencial” está relacionada con la “Aprendizaje Significativo”. Es decir, a menos Barreras de educación superior no presencial, mayor Aprendizaje Significativo de los estudiantes de educación superior. Como conclusión se puede afirmar que las barreras de la educación superior no presencial se relacionan negativa y significativamente en el aprendizaje significativo de los estudiantes; confirmándose la hipótesis de investigación