bluuebunny/crossref_metadata_2025_split huggingface dataset:
Evaluation of water quality and heavy metal contamination in Cauvery River: Tamil Nadu region India
Authors: Velusamy Kavitha , Venkatesan Ragavendran , Sagadevan Suresh , Mahalingam Umadevi , Jamespandi Annaraj , Karazhanov Smagul , Pearce Joshua , Mayandi Jeyanthinath 
Published: October 2024

Abstract
Comprehensive water quality control is a fundamental requirement for environmental preservation and the sustainable development of communities around the globe. To showcase the importance of local quality controls in identifying the sources of pollution, a case study was conducted to analyze the quality of drinking water from different locations along the Cauvery River from Mettur to Trichy (200 km) in Tamil Nadu, India. The quality of water samples from different locations was indexed and compared with the World Health Organization and Indian Standards of water quality. The results indicate some high local values of TDS, hardness, and chloride content. These high values may be due to effluents from industries, dying factories, and sewage from the urban areas on the banks of the Cauvery River. This is most prevalent near Mohanur, where industrial waste and effluents were directly linked into the river. The results emphasize the importance of local quality control for accurately pinpointing the factors affecting the environment.
Clinical and immunogenetic characteristics of psoriatic arthritis: a single-center experience from South India
Authors: Mithun CB  , Antony Paul T , Mariaselvam Christina M , Negi Vir S 
Published: October 2024

Aim
The aim of this study was to determine the clinical characteristics and prevalence of HLA B27 in patients with psoriatic arthritis presenting to a tertiary care centre in South India.

Background
Although the prevalence of psoriasis is high in India, there is paucity of data, especially on Ps A.

Materials and methods
This retrospective study included 141 patients satisfying the ClASsification criteria for Ps A (CASPAR). Demographic, clinical, and laboratory data of the patients were collected through personal interviews, clinical examination, appropriate investigations, and analysis of case records. HLA-B27 typing by PCR method was done for all patients.
ФОРМУЛЫ ОЦЕНКИ ОШИБОК И ИХ АНАЛИЗ ДЛЯ CG, BI-CG И GMRES
Authors: ДЖАЙН П. , МАНГЛАНИ К. , ВЕНКАТАПАТИ М. 
Published: October 2024

Современные требования к точности в измерениях и инженерных моделях увеличивают число обусловленности задач. В то время как увеличение точности чисел с плавающей запятой привело к стабильным вычислениям, увеличилась неопределенность в вопросе сходимости при использовании невязки в качестве критерия остановки. Мы представляем анализ неопределенности сходимости при использовании относительной невязки в качестве критерия остановки для итеративного решения линейных систем, а также получаемое увеличение/уменьшение вычислений при заданной допустимой погрешности. Это показывает, что оценка ошибки важна для эффективного или точного решения, даже когда число обусловленности матрицы невелико. Формула оценки ошибки Ο(1) для итераций алгоритма CG была предложена более двух десятилетий назад. Недавно формула оценки ошибки Ο(κ2) была описана для алгоритма GMRES, который допускает также несимметричные линейные системы, где κ - номер итерации. Мы предлагаем небольшую модификацию этой оценки ошибки GMRES для повышения устойчивости. В данной работе мы также предлагаем формулу оценки ошибки Ο(n) для A-нормы и l2-нормы вектора ошибки в алгоритме Bi-CG. Надежная работа этих оценок в качестве критерия остановки увеличивает экономию и точность вычислений по мере увеличения числа обусловленности и размера задач.
The demands of accuracy in measurements and engineering models today render the condition number of problems larger. While a corresponding increase in the precision of floating point numbers ensured a stable computing, the uncertainty in convergence when using residue as a stopping criterion has increased. We present an analysis of the uncertainty in convergence when using relative residue as a stopping criterion for iterative solution of linear systems, and the resulting over/under computation for a given tolerance in error. This shows that error estimation is significant for an efficient or accurate solution even when the condition number of the matrix is not large. An Ο(1) error estimator for iterations of the CG algorithm was proposed more than two decades ago. Recently, an Ο(κ2) error estimator was described for the GMRES algorithm which allows for non-symmetric linear systems as well, where κ is the iteration number. We suggest a minor modification in this GMRES error estimation for increased stability. In this work, we also propose an Ο(n) error estimator for A-norm and l2-norm of the error vector in Bi-CG algorithm. The robust performance of these estimates as a stopping criterion results in increased savings and accuracy in computation, as condition number and size of problems increase.
ДВОЙСТВЕННЫЙ МЕТОД ДЛЯ РЕШЕНИЯ ЗАДАЧИ О РАВНОВЕСИИ ТЕЛА, СОДЕРЖАЩЕГО ТОНКИЙ ДЕФЕКТ
Authors: ЖИЛЬЦОВ А.В. , МАКСИМОВА Н.Н. 
Published: October 2024

Рассматривается задача о двумерном теле с тонким дефектом, свойства которого характеризуются параметром разрушения. Проводится дискретизация задачи и доказывается теорема о точности аппроксимации. Для решения задачи применяется двойственный метод, основанный на модифицированном функционале Лагранжа. В вычислительных экспериментах при решении прямой задачи используется обобщенный метод Ньютона с выбором шага, удовлетворяющего условию Армихо.
An equilibrium problem of a two-dimensional body with a thin defect whose properties are characterized by a fracture parameter is considered. The problem is discretized, and an approximation accuracy theorem is proved. To solve the problem, a dual method based on a modified Lagrange functional is used. In computational experiments, when solving the direct problem, a generalized Newton's method is used with a step satisfying Armijo's condition.
НЕТРАДИЦИОННЫЕ ИНТЕРВАЛЫ И ИХ ИСПОЛЬЗОВАНИЕ. КАКИЕ ИЗ НИХ ДЕЙСТВИТЕЛЬНО ИМЕЮТ СМЫСЛ?
Authors: ШАРЫЙ С.П. 
Published: October 2024

В статье рассматривается вопрос о том, почему интервалы, являющиеся основным объектом интервального анализа, имеют именно тот вид, который мы хорошо знаем и привычно используем, а не какой-то другой. В частности, мы исследуем, почему традиционные интервалы замкнуты, т.е. содержат свои концы, а также чем плох пустой интервал. Второй вопрос, рассматриваемый в работе, заключается в том, насколько целесообразно расширять набор традиционных интервалов некоторыми другими объектами. Мы показываем, что неправильные («вывернутые») интервалы и арифметика таких интервалов (полная интервальная арифметика Каухера) очень полезны с самых различных точек зрения.
The paper discusses the question of why intervals, which are the main object of Interval Analysis, have exactly the form that we know well and habitually use, and not some other. In particular, we investigate why traditional intervals are closed, i.e. contain their endpoints, and also what is wrong with an empty interval. A second question considered in the work is how expedient it is to expand the set of traditional intervals by some other objects. We show that improper («reversed») intervals and the arithmetic of such intervals (the Kaucher complete interval arithmetic) are very useful from many different points of view.
БЕЗЫНТЕРПОЛЯЦИОННЫЙ LBM НА НЕРАВНОМЕРНЫХ СЕТКАХ
Authors: БЕРЕЗИН А.В. , ИВАНОВ А.В. , ПЕРЕПЁЛКИНА А.Ю. 
Published: October 2024

Метод решёточных уравнений Больцмана (LBM) - это численная схема решения задач гидрогазодинамики. Одним из важных и развивающихся направлений LBM является корректное построение такой схемы на неравномерных пространственных решётках, которые позволяют значительно снизить общее число вычислений. Однако на текущий момент построение схемы LBM вблизи границы решёток с разным пространственным шагом неизбежно влечёт за собой необходимость интерполяции данных, что может снизить порядок аппроксимации LBM и привести к нарушению законов сохранения. В работе впервые разработан и протестирован безынтерполяционный метод построения атермического узлового LBM на неравномерных решётках с единым шагом по времени для сеток разного масштаба, основанный на двухступенчатой процедуре перекалибровки популяций, отвечающих разным шаблонам.
The lattice Boltzmann method (LBM) is a numerical scheme for solving fluid dynamics problems. One of the important and actively developing areas of LBM is correct construction of the scheme on non-uniform spatial grids. With non-uniform grids the total number of calculations can be significantly reduced. However, at the moment the construction of an LBM scheme near a boundary of grids with different spatial steps inevitably requires data interpolation, which can reduce the LBM approximation order and lead to violation of conservation laws. In this work, for the first time, we have developed and tested a method for constructing an athermal node-based LBM on non-uniform grids without interpolation, with the same time step for grids of different scales. The method is based on a two-stage transformation of populations corresponding to different on-grid stencils.
МОДЕЛИРОВАНИЕ МЕТОДОМ МОНТЕ-КАРЛО СИГНАЛА ЛАЗЕРНОЙ НАВИГАЦИОННОЙ СИСТЕМЫ
Authors: КАБЛУКОВА Е.Г. , ОШЛАКОВ В.Г. , ПРИГАРИН С.М. 
Published: October 2024

Разработаны алгоритмы статистического моделирования сигнала, регистрируемого фотоприёмником лазерной навигационной системы, предназначенной для безопасной посадки воздушных судов. Методом Монте-Карло оцениваются мощность и угловые распределения излучения, регистрируемого приёмником, а также анализируется влияние рассеяния различной кратности на регистрируемый сигнал. Проведённые вычисления показывают, что предлагаемые алгоритмы позволяют оценить эффективность работы лазерной навигационной системы в различных условиях.
We have developed stochastic algorithms to simulate signals detected by a receiver of a laser navigation system designed for safe aircraft landing. Radiant flux and radiance at the receiver, as well as the contribution of radiation of different orders of scattering are estimated by a Monte Carlo method. Computation results show that the proposed algorithms allow one to study the efficiency of the laser navigation system in various conditions.
ПРИБЛИЖЁННЫЙ ИТЕРАЦИОННЫЙ АЛГОРИТМ МОДЕЛИРОВАНИЯ НЕГАУССОВСКИХ ВЕКТОРОВ С ЗАДАННЫМИ ОДНОМЕРНЫМИ РАСПРЕДЕЛЕНИЯМИ И КОВАРИАЦИОННОЙ МАТРИЦЕЙ
Authors: АКЕНТЬЕВА М.С. , КАРГАПОЛОВА Н.А. , ОГОРОДНИКОВ В.А. 
Published: October 2024

В работе предложен новый итерационный метод моделирования негауссовских случайных векторов с заданными одномерными распределениями и ковариационной матрицей. Проведено сравнение предложенного алгоритма с другим итерационным алгоритмом моделирования негауссовских векторов, основанным на переупорядочивании выборки независимых случайных величин с заданными одномерными распределениями. Численные исследования показали, что алгоритмы являются фактически эквивалентными в плане точности воспроизведения заданной ковариационной матрицы при моделировании, однако предложенный алгоритм оказался более эффективным по использованию памяти и, во многих случаях, менее трудоёмким.
A new iterative method for the modeling of non-Gaussian random vectors with given marginal distributions and covariance matrix is proposed in this paper. The algorithm is compared with another iterative algorithm for the modeling of non-Gaussian vectors, which is based on reordering a sample of independent random variables with given marginal distributions. Our numerical studies show that both algorithms are equivalent in terms of the accuracy of reproducing the given covariance matrix, but the proposed algorithm turns out to be more efficient in terms of memory usage and, in many cases, is faster than the other one.
ИНВОЛЮЦИИ И КОН-ИНВОЛЮЦИИ
Authors: ИКРАМОВ Х.Д. 
Published: October 2024

Дан обзор свойств сравнительно малоизвестного класса матриц, называемых кон-инволюциями, путем сопоставления их свойств со свойствами хорошо изученных инволютивных матриц или, короче, инволюций.
A review of the relatively little-known matrix class, called coninvolutions, is given. The properties of these matrices are compared with those of the well studied involutory matrices or, briefly, involutions.
К РАСЧЕТУ ТЕЧЕНИЙ ГАЗОЖИДКОСТНЫХ СМЕСЕЙ МОДИФИЦИРОВАННЫМ УЗЛОВЫМ МЕТОДОМ ХАРАКТЕРИСТИК
Authors: СУРОВ В.С. 
Published: October 2024

Для расчета течений газожидкостных смесей предложен модифицированный обратный метод характеристик, в алгоритм которого введен дополнительный дробный временной шаг, что позволяет без потерь точности и устойчивости проводить вычисления с большим временным шагом. Обсуждается постановка граничных условий на криволинейных стенках применительно к многомерному узловому методу характеристик, который базируется на расщеплении вдоль координатных направлений исходной системы уравнений на ряд одномерных подсистем. Для граничных точек, расположенных на криволинейных непроницаемых поверхностях, предложен способ расчета, основанный на методике фиктивных узлов. При тестировании модифицированного метода характеристик рассчитано сверхзвуковое взаимодействие однородного дисперсного потока с преградой для режима течения с присоединенным ударным скачком. Решены задачи об установившихся течениях смеси около внешнего тупого угла, а также около конуса - аналогов течений Прандтля-Майера и Буземана в газовой динамике. Результаты вычислений сопоставлены с имеющимися автомодельными решениями и отмечено их удовлетворительное совпадение.
To calculate flows of a gas-liquid mixture, a modified inverse method of characteristics is proposed, in whose algorithm an additional fractional time step is introduced, which makes it possible to carry out calculations with a large time step without loss of accuracy and stability. A formulation of boundary conditions on curvilinear walls is discussed in relation to the multidimensional nodal method of characteristics, which is based on splitting along the coordinate directions of the original system of equations into a number of one-dimensional subsystems. For the boundary points located on curvilinear impenetrable surfaces, a calculation method based on the method of fictitious nodes is proposed. When testing the modified method, the supersonic interaction of a homogeneous dispersed flow with a barrier is calculated for a flow regime with an attached shock wave. Problems of steady mixture flows near an external obtuse angle, as well as near a cone, which are analogues of the Prandtl-Meyer and Busemann flows in gas dynamics, are solved. The calculation results are compared with available self-similar solutions, and a satisfactory agreement is reached.
Problems of the lower soul in Plotinus: Defining its powers and its origin
Authors: Guba Ágoston 
Published: October 2024

AbstractAlthough there is no real distinction in the soul in the metaphysics of Plotinus, discussing the activities of the individual souls, he does distinguish between higher and lower soul. Reading the Enneads, however, we face at least two major problems concerning the two kinds of soul. (i) Given that Plotinus uses the faculty psychology as well, how can we establish the border between the two kinds of soul in respect of the psychic powers? (ii) Some texts tell us that the lower soul stems from the higher soul, while others trace back to the World Soul. Does Plotinus necessarily have an inconsistent view on the lower soul's origin, or can we reconcile the two views somehow? First, I will present these two issues in more detail and their two main interpretations. Then, I am going to analyse passages of various topics, such as the emergence of desire (IV. 4 [28] 20), the possible extent of purification (I. 2 [19] 5), and the effect of magic on the soul (IV. 4 [28] 43–44). I shall argue that the crucial difference between the two kinds of soul is the ability to make free choices, which allows us to distinguish them in terms of psychic activities. On the basis of this, I intend to show that the lower soul does not originate from the World Soul strictly speaking. Instead, Plotinus uses this claim to demonstrate that certain aspects of us, including some psychic activities as well as moral character and practical life in general, cannot be under our rational control entirely, but they are subjected to the necessity of the cosmos.
“Phones off while school's on”: Evaluating problematic phone use and the social, wellbeing, and academic effects of banning phones in schools
Authors: King Daniel L. , Radunz Marcela , Galanis Christina R. , Quinney Blake , Wade Tracey 
Published: October 2024

AbstractBackground and aimsMobile phone bans in secondary schools are claimed to reduce student distraction and promote learning and face-to-face socializing. Currently, the evidence on phone bans is limited. The aim of this preregistered study was to evaluate the South Australian mobile phone ban's effects on students' problematic phone use, academic engagement, school belonging, and bullying. The study also sought to identify student variables that predict phone ban compliance.MethodsAs the ban was phased in over 2023, a 2 (phone ban: yes/no) × 2 (time: baseline, 1-month follow-up) repeated-measures design was employed. Students (n = 1,282 at baseline; n = 1,256 at follow-up) in Grades 7 to 12 were recruited from five public secondary schools. Surveys included measures drawn from the Longitudinal Study of Australian Children (LSAC) and the Programme for International Student Assessment (PISA).ResultsProblematic phone use was reported by 2.6% of the sample. Being older and a more frequent user of social media predicted lower phone ban compliance. Linear mixed models indicated that ban and no ban school groups did not differ significantly in terms of problematic phone use, academic engagement, and school belonging. There was slightly higher bullying in the ban group but bullying decreased significantly in both groups.DiscussionImposing access restrictions may not affect the underlying psychological mechanisms that drive problematic phone use. Although these results indicate limited to no short-term benefits of the ban, further evaluation with more sensitive methodologies is recommended.ConclusionsStudent-technology interactions in learning institutions should be continually monitored to determine the optimal balance to support student etiquette, learning, and wellbeing.
Effects of storage methods on the quality of Isatis indigotica radix based on active constituents and NIR spectra
Authors: Hou Jia , Guo Hongru , Du Tao , Wang Mingwei 
Published: October 2024

Isatis indigotica radix is a common traditional Chinese medicine and veterinary medicine widely cultivated in China, and inappropriate storage conditions may damage its quality. The objective of this work was to investigate the changes in epigoitrin and nucleosides compounds and Near Infrared Spectra (NIR) of Isatis indigotica radix packaging under vacuum (VP), nitrogen (NP), and sealing (SP), stored at different temperatures—room temperature (SPt), refrigerator (SPr), and frozen (SPf) during 12 months of storage. After 12 months of storage, the epigoitrin concentration of I. indigotica radix samples in VP, NP, and SPt was much higher than in SPr and SPf, while samples in SPf had more contents of nucleosides than the other. Moreover, a significant difference in principal component analysis revealed a superior storage method based on active compounds and NIR spectra. It suggested that NP was considered a better storage method for retaining the chemical and physical properties and quality of I. indigotica radix after 12 months of storage.
Kehinde/Dona Luisa/Luiza Mahin:Les représentations des femmes Noires brésiliennes dans Um Defeito de Cor d’Ana Maria Gonçalves
Authors: Barbosa dos Reis Roseli 
Published: October 2024

La novela Um defeito de cor surge de un contexto sociocultural, político de transición y de cambio de paradigmas de la representación de los Negros/Negras, lo que nos permite destacar las posiciones de los subalternos y de los dominantes. Entre literatura e historia y por medio de archivos recuperados sobre la esclavitud, la vida del personaje de Kehinde, unamujer africana esclavizada, es narrada desde el enfoque de una escritora negra, rompiendo con el racismo, el sexismo y el clasismo de una historiografía literaria hegemónica. Este artículo problematiza la aportación de la novela a la (re)construcción social y a la representación de una nueva imagen y de una nueva identidad sociocultural de las mujeres negras brasileñas por medio de la (re)visión de un pasado “olvidado” de la cultura de origen africano a través del proceso de recuperación de la memoria de la esclavitud.
Method for elimination of residual cavity with rigid fibrous capsule in patients with hepatic echinococcosis and comorbidity
Authors: Nazyrov F. G. , Babadjanov A. Kh. , Makhmudov U. M. , Tuksanov A. I. 
Published: October 2024

Aim. To improve the results of organ-preserving surgeries for hepatic echinococcal cysts with rigid fibrous capsule.Materials and methods. The study analyzed the results of surgical treatment of 221 patients with hepatic echinococcosis that was performed from 2016 to 2023. The main group included 94 patients (2020–2023), who underwent laparotomic or laparoscopic echinococcectomy followed by additional treatment of the residual cavity by the suggested method (113 cysts in total). The comparison group included 88 patients (2016–2019) who underwent standard interventions (108 cysts in total).Results. A treatment method for the residual cavity is selected with regard to the condition of the fibrous capsule. In case of elastic fibrous capsule, resections were performed in 1.7% of patients in the comparison group and 1.9% in the main group. Laparoscopic echinococcectomy was performed in 29.1% and 38.5% of cases, open echinococcectomy – in 69.2% and 59.6%, respectively. In case of rigid fibrous capsule, resections were made in 4.3% of patients in the comparison group and in 8% in the main group. Laparoscopic echinococcectomy was performed in 8.5% and 23.9% of cases, open echinococcectomy – in 87.2% and 68.2%, respectively.Conclusion. The suggested method of additional treatment for the residual cavity in cases of open and laparoscopic interventions enables the risk of early complications to be reduced from 19.1% to 4.5%, and from 16% to 3.4% within 3 months after surgery.