bluuebunny/crossref_metadata_2025_split huggingface dataset:
EFFECT OF DISLOCATION DENSITY ON THE DYNAMIC YIELD STRENGTH OF ALLOYS WITH NANOSCALE DEFECTS UNDER HIGH ENERGY EXTERNAL ACTIONS
Authors: Малашенко Вадим Викторович , Малашенко Татьяна Ивановна 
Published: December 2022

Выполнен теоретический анализ неупругих процессов в состаренных сплавах в условиях интенсивных внешних воздействий. Анализ проведен в рамках теории динамического взаимодействия дефектов. Получено аналитическое выражение зависимости динамического предела текучести от плотности дислокаций. Определена причина различного влияния наноструктурных дефектов на движение дислокаций при высокоскоростной и квазистатической деформации. Показано, что при высокоскоростной деформации наноразмерные дефекты влияют на характер зависимости динамического предела текучести от плотности дислокаций. Эта зависимость становится немонотонной и имеет минимум. В точке минимума происходит переход от доминирования торможения дислокации зонами Гинье-Престона к доминированию её торможения другими дислокациями. Выполнены численные оценки вклада зон Гинье-Престона в величину предела текучести. Показано, что при высокой концентрации зон Гинье-Престона этот вклад является весьма существенным. Выполнены численные оценки плотности дислокаций, при которой нарушается соотношение Тейлора.
A theoretical analysis of inelastic processes in aged alloys under intense external influences is carried out. The analysis was carried out within the framework of the theory of dynamic interaction of defects. An analytical expression for the dependence of the dynamic yield strength on the dislocation density has been obtained. The reason for the different influence of nanostructural defects on the dislocation motion under high strain rate deformation and quasi-static deformation is determined. It is shown that under high strain rate deformation, nanosized defects affect the nature of the dependence of the dynamic yield strength on the dislocation density. This dependence becomes nonmonotonic and has a minimum. At the minimum point, there is a transition from the dominance of the drag of the dislocation by Guinier-Preston zones to the dominance of its drag by other dislocations. Numerical estimates of the contribution of the Guinier-Preston zones to the yield strength are made. It is shown that at a high concentration of Guinier-Preston zones, this contribution is very significant. Numerical estimates are made of the dislocation density at which the Taylor relation is violated.
METHODS FOR DESCRIBING THE REACTIVITY OF TRANSITION METAL NANOPARTICLES
Authors: Замулин Иван Сергеевич , Голубничий Артем Александрович , Чепкасов Илья Васильевич , Байдышев Виктор Сергеевич 
Published: December 2022

Используя современные расчеты из первых принципов, в данной работе мы систематически изучали адсорбцию атомарного кислорода на поверхности наночастиц ГЦК металлов Ag, Cu, Pd состоящих из 79 атомов. Было рассмотрено две модели для описания реакционной способности переходных металлов на основе центра d-зоны (d-band center) атомов поверхности, а также на основе обобщенного координационного числа. Оба метода предсказания энергии адсорбции атомов кислорода на различных сайтах показали себя хорошо, однако метод основанный на обобщенном координационном числе более прост в вычислительном плане, так как для этого метода нужна информация лишь о структуре частицы, в то время как для модели d-band center необходимы расчеты электронной структуры. Полученные значения энергии адсорбции кислорода и d-band center соответствуют известным литературным данным. Наиболее благоприятные позиции для адсорбции атома кислорода находятся на плоскости (100) и представляют собой полости состоящие из 4 атомов и не зависят от типа рассматриваемого металла. Наибольшая энергия адсорбции атома кислорода наблюдалась в случае медных наночастиц.
Using modern calculations from first principles, in this work we systematically studied the adsorption of atomic oxygen on the surface of nanoparticles of fcc metals Ag, Cu, Pd consisting of 79 atoms. Two models were considered to describe the reactivity of transition metals based on the d-band center of surface atoms, as well as on the basis of the generalized coordination number. Both methods for predicting the adsorption energy of oxygen atoms at different sites have shown good results, however, the method based on the generalized coordination number is computationally simpler, since this method requires information only about the structure of the particle, while the d-band center model requires electronic structure calculations. The obtained values of the oxygen adsorption energy and d-band center correspond to the known literature data. The most favorable positions for the adsorption of an oxygen atom are on the (100) plane and are hollow consisting of 4 atoms and do not depend on the type of metal under consideration. The highest adsorption energy of the oxygen atom was observed in the case of copper nanoparticles.
IDENTIFICATION OF COMPLEX CORE-SHELL NANOSTRUCTURES FROM THE RADIAL DISTRIBUTIONS OF THE LOCAL DENSITY OF COMPONENTS
Authors: Талызин Игорь Владимирович , Богданов Сергей Сергеевич , Самсонов Владимир Михайлович , Сдобняков Николай Юрьевич , Григорьев Роман Евгеньевич , Первиков Александр Васильевич , Мишаков Илья Владимирович 
Published: December 2022

Работа посвящена обоснованию и дальнейшему развитию подхода к анализу мезоскопической и интегральной структуры бинарных металлических наночастиц по радиальным распределениям локальной плотности компонентов. В качестве примера рассмотрены распределения локальной плотности Ni и Al, полученные с использованием результатов молекулярно-динамического моделирования бинарных наночастиц Ni-Al с исходным однородным распределением компонентов и икосаэдрических наноструктур ядро-оболочка Ni@Al. Оба паттерна демонстрируют сегрегацию атомов Al в ходе релаксации и последующей закалки исходных конфигураций, содержащих 5000 атомов в соотношении 1:1 (радиус наночастиц 3 нм). В процессе закалки температура наночастиц уменьшалась от 1000 К до 0,01 К с низкой для атомистического моделирования скоростью охлаждения. Экспериментально бинарные наночастицы Ni-Al радиуса порядка 100 нм (76Ni:24Al ат.%) были синтезированы методом электровзрыва проволок. Представлены и проанализированы экспериментальные распределения интенсивностей, полученных по данным энергодисперсионного анализа при воздействии электронного пучка. Эти распределения в большей степени соответствуют начальным конфигурациям в молекулярно-динамических экспериментах, т.е., очевидно, являются неравновесными. Вместе с тем, сделан вывод, что и конечные молекулярно-динамические конфигурации также не являются в полной степени равновесными.
The paper is devoted to the substantiation and further development of the approach to the analysis of the mesoscopic and integral structure of binary metal nanoparticles from the radial distributions of the local density of the components. As an example, the local density distributions of Ni and Al obtained using the results of molecular dynamics modeling of binary Ni-Al nanoparticles with an initial uniform distribution of components and Ni@Al core-shell icosahedral nanostructures are considered. Both patterns demonstrate the surface segregation of Al atoms during relaxation and subsequent quenching of the initial configurations containing 5000 atoms in 1:1 ratio (nanoparticle radius 3 nm). During cooling, the temperature of the nanoparticles decreased from 1000 K to 0,01 K with a low for atomistic simulation cooling rate. Experimentally binary Ni-Al nanoparticles with a radius of about 100 nm (76Ni:24Al at.%) were synthesized by the wire electric explosion. The experimental intensity distributions obtained from the data of energy-dispersive analysis under the action of an electron beam are presented and analyzed. These distributions correspond to a greater extent to the initial configurations in our molecular dynamics experiments, i.e., they are obviously nonequilibrium. At the same time, it was concluded that the final molecular dynamic configurations are also not entirely equilibrium.
TO THE PROBLEM OF INVESTIGATING THE PROCESSES OF STRUCTURE FORMATION IN FOUR-COMPONENT NANOPARTICLES
Authors: Вересов Сергей Александрович , Савина Ксения Геннадьевна , Веселов Алексей Дмитриевич , Серов Сергей Викторович , Колосов Андрей Юрьевич , Мясниченко Владимир Сергеевич , Сдобняков Николай Юрьевич , Соколов Денис Николаевич 
Published: December 2022

Исследованы различные типы конфигураций четырехкомпонентной наносистемы Au-Cu-PD-PT, включая сложные структуры ядро-оболочка. В качестве метода моделирования использовался метод Монте-Карло, межатомное взаимодействие описывалось потенциалом сильной связи - потенциалом Гупты. По результатам серий компьютерных экспериментов было установлено, что четырехкомпонентные наночастицы в данной системе не имеют склонности к формированию структуры ядро-оболочка, даже при том, что атомы золота имеют повышенную сегрегацию к поверхности. Определены температуры плавления для исследуемых наносплавов. Полученные значения находятся в диапазоне от 1100 K до 1250 K и слабо зависят от композиции наночастиц (соотношения числа атомов). Обнаружен стехиометрический состав на основе этих металлов, для которого в процессе охлаждения формируется кристаллическая ГЦК структура с включениями ГПУ фазы. Однако отличительных особенностей в характере сегрегации для данного стехиометрического состава не установлено. Все рассмотренные составы в исследуемом температурном диапазоне были стабильны по отношению к распаду.
Various types of configurations of the Au-Cu-Pd-Pt four-component nanosystem, including complex core-shell structures, have been studied. The Monte Carlo method was used as a simulation method, the interatomic interaction was described by the tight-binding potential, i.e. the Gupta potential. According to the results of a series of computer experiments, it was found that four-component nanoparticles of this system do not tend to form a core-shell structure, even though gold atoms have an increased surface segregation. The melting temperatures for the nanosystems under study have been determined. The obtained values are in the range from 1100 K to 1250 K and weakly depend on the composition of nanoparticles (the ratio of the number of atoms). A stoichiometric composition based on these metals was found, for which, during cooling, an FCC crystal structure with inclusions of the HCP phase is formed. However, no distinctive features in the nature of segregation for this stoichiometric composition have been established. All considered stoichiometric compositions in the studied temperature range were stable with respect to decomposition.
STUDY OF THE STRUCTURE AND PROPERTIES OF ZINC SILICATE STABILIZED WITH L-HISTIDINE
Authors: Блинова Анастасия Александровна , Ясная Мария Анатольевна , Маглакелидзе Давид Гурамиевич , Тараванов Максим Александрович , Лапин Вячеслав Анатольевич , Леонтьев Павел Сергеевич 
Published: December 2022

В данной работе представлены результаты исследования процесса стабилизации наночастиц силиката цинка с использованием аминокислоты L-гистидина. В качестве прекурсора использовали ацетат цинка, в качестве осадителя -силикат натрия, стабилизатором выступала аминокислота L-гистидин. Синтез осуществляли методом химического осаждения в водной среде. Провели синхронный термический анализ, в результате которого установлено, что добавление аминокислоты в наноразмерный силикат цинка оказывает большое влияние на кристаллическую структуру и термические переходы для данного материала. Далее провели рентгенофазовый анализ, который показал, что частицы силиката цинка имеют аморфную структуру и находятся в наноразмерном состоянии. Затем исследовали процесс взаимодействия аминокислоты с частицей силиката цинка методом ИК-спектроскопии. Результаты исследования показали, что стабилизация частиц сопровождается образованием химической связи между кремнием в молекуле силиката цинка и аминогруппой в молекуле L-гистидина.
This paper presents the results of a study of the process of stabilization of zinc silicate nanoparticles using the amino acid L-histidine. Zinc acetate was used as a precursor, sodium silicate was used as a precipitant, and the amino acid L -histidine acted as a stabilizer. Synthesis was carried out by chemical precipitation in an aqueous medium. A simultaneous thermal analysis was carried out, as a result of which it was found that the addition of an amino acid to nanosized zinc silicate has a great influence on the crystal structure and thermal transitions for this material. Next, the X-ray phase analysis was carried out, which showed that of zinc silicate particles have an amorphous structure and are in a nanoscale state. At the next stage of the work, the process of interaction of an amino acid with a zinc silicate particle was studied by IR spectroscopy. The results of the study showed that stabilization of particles is accompanied by the formation of a chemical bond between silicon in the zinc silicate molecule and the amino group in the L -histidine molecule.
Student debt incidence: recent data and conceptual issues
Authors: Manes Jordan B. , Moschini Emily , Phelan Thomas M. 
Published: December 2022

Abstract: In recent years, the rising level of student debt has led to calls for increased government assistance in the form of partial or full student debt cancellation. In this Commentary, we use the 2019 Survey of Consumer Finances (SCF) to study the incidence of student debt and cancellation benefits along quantiles of household income, net worth, and our estimate of lifetime wealth. We show that student debt is highly concentrated among households with low net worth, but much more evenly distributed across income and lifetime wealth. We then highlight several challenges in using such statistics to draw conclusions about whether cancellation will ultimately increase or decrease inequality in lifetime wealth, and we outline open questions for future research.
Replication materials for this Commentary may be found at https://github.com/tphelanECON/student_debt_SCF
Hepatitis C time trends in reported cases and estimates of the hidden population born before 1965, Denmark and Sweden, 1990 to 2020
Authors: Christensen Peer Brehm , Debrabant Birgit , Cowan Susan , Debrabant Kristian , Øvrehus Anne , Duberg Ann-Sofi 
Published: December 2022

Background
According to the World Health Organization, hepatitis C virus (HCV) infection should be under control by 2030.

Aim
Our aim was to describe the size and temporal changes in reported cases of chronic HCV infection in Denmark and Sweden and to estimate the size of the hidden (undiagnosed) population born before 1965.

Methods
We extracted all HCV infections reported to national surveillance systems in Denmark and Sweden from 1990 to 2020. Prediction of the size of the hidden HCV-infected population was restricted to the cohort born before 1965 and cases reported up to 2017. We applied a model based on removal sampling from binomial distributions, estimated the yearly probability of diagnosis, and deducted the original HCV-infected population size.

Results
Denmark (clinician-based) reported 10 times fewer hepatitis C cases annually than Sweden (laboratory and clinician-based), peaking in 2007 (n = 425) and 1992 (n = 4,537), respectively. In Denmark, the birth year distribution was monophasic with little change over time. In recent years, Sweden has had a bimodal birth year distribution, suggesting ongoing infection in the young population. In 2017, the total HCV-infected population born before 1965 was estimated at 10,737 living persons (95% confidence interval (CI): 9,744–11,806), including 5,054 undiagnosed, in Denmark and 16,124 (95% CI: 13,639–18,978), including 10,580 undiagnosed, in Sweden.

Conclusions
The reporting of HCV cases in Denmark and Sweden was different. For Denmark, the estimated hidden population was larger than the current national estimate, whereas in Sweden the estimate was in line with the latest published numbers.
Covid-19 Effect on Business Performance SMMES Perspectives in a South African Context
Authors: Mkhonza Vukile Mlungisi , Sifolo Portia Pearl Siyanda 
Published: December 2022

Purpose: There is lack of enough empirical and conceptual studies of business performance among Small Medium Enterprises (SMEs), not only in South Africa, but the African continent.
Design/methodology/approach: A quantitative study was conducted with the use of an online survey distributed to the sample of 169 participants who were SMME owners and management in Johannesburg CBD.
Findings: The results showed that most SMMEs owners used strategic planning techniques which helped improve their performance. Formalizing SMMEs strategic planning process and taking advantage of technology is imperative for business performance. However, these results were based on a single point in time; therefore,
longitudinal research will be able to provide new insight on how strategic planning can influence the performance of SMMEs.
Research limitations/implications: This research study sought to investigate the Small Micro Medium Enterprises (SMMEs)’ perspective on business performance during Covid-19 in Johannesburg Central District Municipality (CBD).
Practical implications: The research focused mainly on SMMEs operating in Johannesburg CBD
Paper type: Research Paper
Participation Ladder in Business Incubation Program
Authors: Utomo Priyo , Dharmawan Arif , Zakariya Zakariya , Handoko Rudy 
Published: December 2022

Purpose: The government's efforts in developing the economy of low-income communities in the city of Surabaya require high participation support. The low community participation in the incubation facilitation program for independent businesses is a problem that needs a solution
Design/methodology/approach: The research method used is descriptive quantitative and case study methods. Data collection techniques using a questionnaire. The analysis technique uses inferential analysis and analysis of data characteristics.
Findings: The results of this study indicate that the novelty at the level of community participation is arranged into three steps, namely: Stairs 1 (Basic Need Participation), 2 (Learning Encouragement), and 3 (Participation for growth).
Paper type: Research paper
Analysis of the Level of Efficiency, Effectiveness, and Convenience of Using a Pedal Powered Water Pump for Irrigation Activities
Authors: Hatta Mochammad , Tjahjani Ida Kusnawati , Nurmawati Nurmawati 
Published: December 2022

Purpose: Analyze the level of efficiency, effectiveness, and convenience of using a pedal-powered water pump for irrigation activities.
Design/methodology/approach: This study uses a qualitative approach by conducting interviews, observations, and documentation on farmers in Carat Village, Pasuruan Regency and conducting descriptive analysis of the data that has been collected.
Findings: The results show that the use of a pedal-powered water pump has various benefits, including efficiency, effectiveness, convenience for farmers, and other benefits.
Research limitation/implications: This research is limited to land that has the same geographical conditions
Practical implications: This research is limited to land that has the same geographical conditions.
Originality/value: This research is original
Paper type: Research paper
Government Policy, Innovation Capability, Internal Environment and Its Influence on the Business Performance of Craftsmen at the Silver Handicraft Industry Clushter in Pasuruan Regency
Authors: Sitohang Arga Christian , Wiwoho Bambang 
Published: December 2022

This study aims to explain Government Policy, Internal Environmental, Innovation Capability, and Its Influence on the Business Performance of Craftsmen at the Silver Handicraft Industry Clushter in Pasuruan Regency. The research model with hypothesis development was derived based on the literature. To provide empirical evidence, this study conducted a survey, using primary data collected using a list of questionnaires, and saturated sampling of 50 craftsmen at the Silver Handicraft Industry Clushter in Pasuruan Regency. The results showed that Government Policy had an insignificant effect, Innovation Ability had a positive and significant effect, Internal Environment had a positive and significant effect on employee performance at the Silver Handicraft Industry Center in Pasuruan Regency. The results of this study do not support the research of Hafizah, et al (2017), Putra and Bayu (2017), Wisardja (2000), Yonggui, et al. (2000), Fogel (2001), Poisson, et al. (2002), Saxby, et al. (2002), Prasetyo (2003), Supriyono and Setiawan (2004), Mujali (2004), Ngamkroeckjoti, et al (2005), Pettus, et al. (2007), Rodrigues and Esteves (2007). The implication of the research is to examine the perceptions of 50 employees at the Brem Small Industry Clushter in Pasuruan Regency. The analytical technique used is multiple linear regression.
The Effect of Supervision, Work Motivation, and Interpersonal Communication on Employee Performance and Organizational Commitment as Variables Intervening
Authors: Norawati Suarni , Lutfi Amir , Zulher Zulher , Basem Zamhir 
Published: December 2022

Purpose: Performance is a result that can be achieved by an individual at a certain time. Many factors can affect employee performance, but this study only aims to see the effect of supervision, work motivation and personal communication on performance and moderated by organizational commitment.
Design/methodology/approach: This research was conducted at PR Lutvindo Wijaya Perkasa by using as many as 137 employees as respondents in this study. The types of data used are primary data and secondary data, obtained by interviews, questionnaires and documentation.
Findings: The results of this study conclude that supervision and motivation have a significant effect on employee performance, but interpersonal communication has no effect on organizational commitment. Then supervision and personal communication have no significant effect on performance, while motivation and organizational commitment have a significant effect on employee performance.
Practical implications: The data analysis tool is Path Analysis using the Smart PLS Versi 3.00 program.
Originality/value: This paper is original
Paper type: Research paper
The Impact of Project-Based Collaborative and Participatory Learning Models on Student Achievement and Recognition Faculty of Computer Science Narotama University
Authors: Falani Achmad Zakki , Alimudin Arasy , Sukoco Agus , Setiawan M. Ikhsan , Mudjanarko Sri Wiwoho , Kamisutara Made , Setiawan Eman 
Published: December 2022

Purpose: This study aims to determine the influence of project-based collaborative and participatory learning on student achievement and recognition, especially at the Faculty of Computer Science, University of Narotama (Unnar).
Design/methodology/approach: The model is carried out by involving the Information Systems and Informatics Engineering Study Program. It analyzes the relationship between the variables associated with the learning model.
Findings: The results showed a significant effect of collaborative and participatory learning on educational accomplishments and understanding.
Originality/value: This paper is original
Paper type: Research paper