bluuebunny/crossref_metadata_2025 huggingface dataset:
Простой способ оценки производной эмпирической функции по ее значениям в неравноотстоящих точках
Authors: Beygelzimer Emmanuil , Beygelzimer Yan
Published: August 2023

Бейгельзимер Э. Е., Бейгельзимер Я. Е. Простой способ оценки производной эмпирической функции по ее значениям  в неравноотстоящих точках

Предложена эвристическая формула 5-точечной аппроксимации первой производной неизвестной функции, значения которой измерены с погрешностью в неравноотстоящих точках. Расчет производной в данной точке выполняется по эффективным приращениям функции и аргумента, учитывающим разные весовые коэффициенты для ближних и удаленных точек измерений. Для определения рациональных значений весовых коэффициентов применено имитационное моделирование на тестовых функциях с известными производными. Детально описаны результаты моделирования на двух тестовых функциях, одна из которых имитирует процесс водяного охлаждения горячего стального листа, вторая – сложный колебательный процесс с переменной частотой и амплитудой. Установлено, что оптимальные значения весовых коэффициентов остаются примерно одинаковыми для существенно разных функций, что позволяет рекомендовать одну и ту же формулу для всех случаев. В отличие от классических методов численного дифференцирования функций, табулированных в неравноотстоящих узлах, предложенная формула одновременно учитывает сглаживание эмпирических данных. Показано, что это существенно повышает точность численной оценки производной даже в тех случаях, когда случайная погрешность измерения функции составляет весьма малую величину, - от ± 1 %. Полученная формула рекомендуется к использованию при решении любых задач ОМД, требующих оценки производной эмпирической функции, в том числе при расчете напряженно-деформированного состояния металла, описании тепловых процессов, определении теплофизических свойств материалов.
Вплив швидкості деформування на гаряче зворотне видавлювання осесиметричного порожнистого виробу
Authors: Kaliuzhnyi Vladymyr , Levchenko Volodymyr , Yarmolenko Oleksandr , Tahan Liubov
Published: August 2023

Калюжний В. Л., Левченко В. М., Ярмоленко О. С., Таган Л. В. Вплив швидкості деформування на гаряче зворотне видавлювання  осесиметричного порожнистого виробу

Моделюванням методом скінченних елементів вивчено вплив швидкості деформування на процес гарячого зворотного видавлювання з осаджуванням із високовуглецевої сталі осесиметричного порожнистого виробу з виступом на торці донної частини. Швидкість переміщення пуансону змінювалася від 50 до 400 мм/сек. Проведено розрахунковий аналіз процесів видавлювання з осаджуванням, процесів вилучення пуансонів із здеформованих заготовок та процесів виштовхування виробів із матриць. Встановлено залежності зусилля видавлювання від переміщення пуансона, залежності зусилля вилучення пуансона від його зворотного переміщення і залежності зусилля виштовхування виробу з матриці від переміщення виштовхувача. За величинами нормальних напружень визначено розподіл питомих зусиль на торцях пуансона, виштовхувача та по висоті поверхні матриці. Збільшення швидкості деформування з 50 до 200 мм/сек призводить до суттєвого зниження зусилля деформування. Подальше зростання швидкості мало впливає величину зусилля. Наведено рекомендації щодо вибору пресового обладнання. Для кінцевої стадії видавлювання з осаджуванням показано розподіл температури, компонент напружень і деформацій в деформованому металі. Визначено температуру охолодження в шарах металу, розташованих поблизу контактуючих поверхонь. Встановлено кінцеві форма та розміри виробу. Для одержання рівного торця стінки необхідна додаткова операція його підрізання. Проробку структури металу пластичною деформацією оцінено за величиною інтенсивності деформацій у стінці та донній частині виробу. Одночасне формоутворення зворотним видавлюванням з осаджуванням призводить до більш інтенсивного пропрацювання структури металу пластичною деформацією і знижує нерівномірність інтенсивності деформацій по ширині стінки виробу.
The Effect of Earthquake Disaster Management Preparedness Knowledge and Training on Midwife Preparedness in Central Aceh Regency, Indonesia
Authors: Hasritawati  , Sri Wahyuni MS  , Barirah Madeni
Published: August 2023

The threat of an earthquake has received wide attention, because it is sudden, predictable, but difficult to determine when it will occur. Predictions are based on the monitoring of seismic activity, historical records and observations. Disasters always have an adverse impact, such as damage to physical facilities and infrastructure (residential housing, office buildings, schools, places of worship, roads, bridges and others). Midwives are health workers who generally work in Health Center or in the community/community closest to the impact of the disaster. The contribution of the midwife to disaster/emergency risk reduction or preparedness is very important. Meanwhile, midwives are often not included in the workforce for disaster preparedness at local, national and international levels. This study aimed to determine the effect of knowledge and training on earthquake disaster preparedness on the preparedness of midwives in Central Aceh Regency. This study uses a survey research design that is analytic in nature with an approach cross-sectional which is measured at the same time as the research takes place and tested through hypothesis testing. The sample is 208 samples. The sampling method in this study was carried out proportionally in proportion to the total population spread across 14 Districts in Central Aceh Regency. The results of the study show that there is an influence of knowledge variables (p = 0.018), and disaster training (p = 0.000). This shows that knowledge and training have a relationship and influence on earthquake disaster preparedness in Central Aceh Regency.
Preparedness of Teachers for Implementing Competency-Based Curriculum System of Education in Public Secondary Schools in Nyamira South Sub- County
Authors: Okeyo Sarah Moraa , Mokua Zacharia Ondieki
Published: August 2023

Competency-based curriculum (CBC) was introduced in primary schools in Kenya in 2016. It was rolled out in secondary schools in January 2023. Its success depended on early preparations in terms of training of teachers, among other requirements. A convergent mixed methods research design was employed, while Concern-Based Adoption Model guided the study. Stratified, purposive and simple random sampling techniques were used to obtain a sample of 483 respondents. Data from the respondents was obtained through a questionnaire, interview schedule and document analysis and observation schedule. These instruments were subjected to piloting to ascertain their validity and reliability. Quantitative data was analysed through descriptive techniques. NVivo software was used to analyse qualitative data. Findings from both quantitative and qualitative analysis were triangulated to facilitate reliable findings. The study established that all public secondary schools in Nyamira South Sub-County were ill-prepared to implement CBC. Most of their teachers had not been trained in the new curriculum. The study concluded that teachers need to be well-trained on CBC before implementing it in public secondary schools in the Nyamira South Sub-County. That the training should not be hurriedly done as a public relations exercise
Descripción Clínica de los Pacientes Pediátricos Oncológicos con Neutropenia Febril Ingresados a la Unidad de Cuidados Intensivos de la Unidad Nacional de Oncología Pediátrica
Authors: Gavidia Mayora Gabriela Marina , Armendáriz Ortíz Amanda Lucía , Mack Rivas Ricardo Alfredo
Published: August 2023

Objetivo: Describir las características clínicas de los pacientes pediátricos oncológicos que fueron diagnosticados con Neutropenia Febril (NF) ingresados por primera vez a la Unidad de Cuidados Intensivos (UCI) de la Unidad Nacional de Oncología Pediátrica (UNOP). Métodos:  Estudio descriptivo y retrospectivo, se caracteriza un total de 211 pacientes que desarrollaron NF y requirieron ingreso a la UCI, entre los años 2017 a 2021. Resultados: La edad promedio fue de 8 años, 46% fueron hombres y 54% mujeres. Se presentó neutropenia severa en el 72.77% de los casos y la leucemia (81.99%) fue el diagnóstico oncológico destacado. Dentro de todos los tratamientos, el 38.39% de los pacientes se encontraban en fase de inducción. En un 33.18% se logró identificar un agente infeccioso asociado. Las bacterias de tipo Gram-negativo fueron el agente infeccioso causal más frecuente (13.74%). La media del tiempo de estancia en UCI fue de 6.75 ± 5.79 días. Un 91.62% de pacientes no ameritaron ventilación mecánica y la complicación más frecuentemente asociada a NF fue Sepsis en un 65.88% de los casos. Conclusión: La mayoría de los casos de Neutropenia Febril son severos, las neoplasias hematológicas (LLA y LMA) son la enfermedad de base más frecuente para el desarrollo de NF y las bacterias de tipo Gram-negativo son el agente infeccioso más frecuente. La mayoría de los pacientes no ameritan ventilación mecánica y las complicaciones más frecuentemente asociadas son Sepsis y Neumonía.
1H NMR-based metabolomics of cacao pod husk: profile comparison of three drying treatments
Authors: Villalón-López Demelza Nayelli , Hernández-Ortega Marcela , Ortiz-Moreno Alicia , Ceballos Guillermo , Zepeda-Vallejo Gerardo , Valadez-Carmona Lourdes
Published: August 2023

Aim: The aim of this study is to apply untargeted proton nuclear magnetic resonance (1H NMR) and chemometric analysis to obtain the cacao pod husk (CPH) fingerprint and evaluate the effect of dehydration in the CPH metabolome.
Methods: Phosphate buffer extracts (pH 6.5) were obtained and measured using a one-dimension (1D) 1H NMR spectrometry. The 1D 1H NMR spectra were recorded without spinning and using the presaturation (PRESAT) pulse sequence to suppress the residual H2O signal. The 3-(trimethylsilyl) propionic-2,2,3,3-d4 acid sodium salt (TSP) was used as an internal reference. Analysis of processed data, applying an orthogonal projection on latent structure-discriminant analysis (OPLS-DA) model was used to highlight significant differences between the three dehydration treatments. Signal assignment of CPH metabolites was carried out based on the coupling constant, software simulation prediction, published data comparison, and metabolomics databases.
Results: A total of 25 compounds were detected by 1H NMR, methylxanthines, sugars, some amino acids, fatty acids, and organic acids were found among the identified compounds. The fingerprint spectra of the three dehydration methods were clustered separately discriminating the metabolome profile of each of the dehydration treatments, finding that metabolome remarkably differed in theanine, myristic acid, fumaric acid, and aspartic acid composition.
Conclusions: An untargeted metabolomics to obtain the fingerprint of CPH was successfully established. A 1H NMR spectra with a detailed signal assignment aided to identify 25 metabolites present in CPH fresh and dried by different methods. The results complement the information about CPH composition and how it is affected by the temperature used during the dehydration process. The multivariate analysis points out that freeze drying (FD) preserves the metabolites better than microwave drying (MWD) or hot air drying (HAD). FD and MWD are similar in composition maintaining most of the compounds after drying.
FIVE FORCES ANALYSIS OF COFFEE BUSINESS INDUSTRY IN TEMANGGUNG REGENCY OF CENTRAL JAVA
Authors: Kusmulyono Muhammad Setiawan , Rachman Rathria Arrina , Gunawan Vania Pradipta
Published: August 2023

Coffee is a valuable commodity whose popularity is increasing and substantially contributes to economic growth. Coffee is an essential asset on a global scale, and the market has been continuously rising over the past 30 years. Temanggung, in Central Java, is one of the most well-known coffee-producing regions with a unique character. Temanggung is remarkable because it has two geographical indication certificates, Sindoro Sumbing Arabica, and Temanggung Robusta, and is the largest Arabica and Robusta coffee-producing area in Central Java. This study aimed to investigate the competitive landscape using Porter's Five Forces by applying qualitative research to the coffee business in Temanggung. The study's findings revealed that by understanding the capabilities of each force in the industry for each category of business actor and coffee bean type, stakeholders could gain unique knowledge about the coffee industry, particularly the problems throughout the value chain. This research is useful in assisting business actors and other stakeholders in making the best possible decisions. Finally, this research can assist central and local governments in efficiently promoting Indonesia's increasingly promising coffee sector in the future.
PURCHASE INTEREST REVIEWED BASED ON PRICE AND LOCATION AT DANU JAYA BIRDSHOP PEMATANG SIANTAR
Authors: Efendi Efendi , Butarbutar Marisi , Girsang Rosita Manawari , Chandra Erbin , Candra Vivi
Published: August 2023

The research objective is to determine the impact of price and location on buying interest. The approach used in the research design is a qualitative descriptive approach and a quantitative descriptive approach. This study uses a test of validity, reliability, normality, simple linear regression, correlation and determination, the t test with the results of the study, namely a positive and significant effect between price and location on buying interest and a moderately high level of relationship. The contribution of price and location to buying interest was 49,5%
Analisis Perbandingan Tingkat Keuntungan Dan Risiko Portofolio Dengan Menggunakan Model Indeks Tunggal Dan CAPM
Authors: Achmad Daniel Noor , Yudha Andi , Bela Marita
Published: August 2023

The purpose of this study is to determine the level of retum and risk from a portfolio using Single Index method and CAPM measured using average yield, while the risk ofportfolio is measured by Single Index model calculated using variance, while the risk is measured using CAPM model by beta value (market risk). The analysis used in this study is comparing results of calculation using formulas both Single Index and CAPM models. The fonnulas include methods to measure the return and risk of a stock portfolio. Beta factor is used to measure the sensitivity of the portfolio to the market and both models use the same calculation. The period of this study is during August 2012 — January 2013 by using index data to determine the level of expected return and the risk of each portfolio. The result shows that the highest average expected return rate in the period ofstudy which using the Single Index Model is owned by Sri-Kehati portfolio that has an average rate of return amount 0.0009 and has as small risk of total consisting in market company risk with an amount of 0.00007. Furthermore the smallest return in average is owned by Pefind025 with the amount of 0.0004 and the highest risk with the amount of 0.00010, and the pefind025 portfolio has the smallest beta. In CAPM model we found that all portfolios has negative return and negative risk premises which means six ofthe portfolios do not meet the expected returns.

Keywords: return, risk, beta, Single Index Model, CAPM
Pengaruh Kualitas Produk Dan Kualitas Pelayanan Terhadap Kepuasan Pelanggan Pada PDAM Tirta Pakuan Kota Bogor
Authors: Retna Dewi Wulan , Sulistiono Angga
Published: August 2023

In the free trading era, many companies are met with increasing consumer demands. Companies must provide service excellenæ to satisfr customets. The serviæ quality has a closed relationship with the customer satisfaction. PDAM Tirta Pakuan Kota Bogor, as a public service company, develops the products and services quality. The companies' strategies are providing a goodfoundation for business continuity, encourage the creation ofcustomer satisfaction, establish recommendations through word of mouth. The purpose of this study is to examine the effect of product quality and service quality on customer satisfaction. The results showed that the regression equation ofproduct quality and service quality on customer satisfaction is: Y = 7.054 + 0.164 XI + 0.468 X2. It means that all the independent variables has a positive effect on customer satisfaction. The hypothesis test ofpartial variable product quality and service quality showed significantly, because all the significant value under 0.05. Product quality has significantly positive effect on customer satisfaction. The result ofsimultaneous hypothesis testing are rejecting HO and accepting HI. So it can be concluded that the product quality (XI) and service quality (X2) simultaneously influenæ the customer satisfaction variable. Based on the result study, The Product Quality and Service Quality are the important components to be increased by PDAM Tirta Pakuan Kota Bogor.

Keywords: quality products, quality service, customer satisfaction
Pengaruh Hutang Jangka Pendek Dan Hutang Jangka Panjang Dalam Menilai Kinerja Perusahaan Dari Aspek Profitabilitas
Authors: Supriadi Yoyon , ALFIANA M. NUR
Published: August 2023

Firms are facing dificulties in running business if only using internal source of funds. The growth or development of a company results in the need for greater funding. Hartono (2000, 254), mentions that the debt contains risk. The higher the risk of a company, the higher the level ofprofitability expected in retumfor the high risk and conversely the lower the risk of the company, the lower the level of profitability expected in return for lower risk. This study tries to investigate the effect of short and long term debts on company's performance when viewed from its profitability aspect. The results showed that simultaneous independent variables Y1(Return on Assets) and the independent variable Y2 (Return On Equity) there is no significant effect on the independent variable. The coeficients determinations show that there are other variables that determine the returns or profitability. Based on the establishment of the regression equation suggests that if there is an addition of one - unit on the coefficients Change of Debt Short - Range and the Longterm Debt Equity Retum on Assets will decrease, as well as in the event ofone - unit increments of the coefficients Change of Debt Short - Range Longterm Debt Equity and the Retum On Equity will decline .

Keywords: long-term debt, profitability
Analisis EBIT-EPS Dalam Hubungannya Dengan Keputusan Pendanaan Perusahaan
Authors: Purba Jan Horas V , Effendy Marwan , Kirana Resti
Published: August 2023

The purpose of this study is to examine the funding policy decision taken by the management company or whether it should use alternate equity financing or debt financing altematives using analysis of EBIT-EPS indifference point through calculations and conduct analyzes related to EBIT-EPS indifference point and corporate funding in the period 2006-2011. The analytical method used is the ratio analysis to determine the value of each variable, correlation coeficient to determine the relationship between variables, coefficient of determination to measure the relationship between variables, and the regression coeficient, where the authors used a simple linear regression with t-test and f-test to measure the effect of independent variables on the dependent variable.

Keywords: EBIT-EPS indifference point, funding decisions
Analisis Profitabilitas, Firm Size, Business Risk dan Asset Tangibility Terhadap Komposisi Struktur Modal
Authors: Muktiadji Nusa , Setiana Anna , Deviena Cinthia
Published: August 2023

The decision of financing closely related to the type of source of funds that will be used. Such decision must take into consideration whether the firm will be using internal or external source of funds. The purpose of this study is to analyse profitability as measured by the Operating Profit Margin (OPM), firm size, and determine business risk on the composition of the capital structure measured by Debt to Equity Ratio (DER). The methods used in this research are descriptive comparative and statistic analyses. These methods are used to answer the research questions on profitability analysis, firm size, business resik and asset tangibility and their influence on firm 's capital structure.

Keywords: Profitability, Firm Size, Business Risk, Asset Tangibility, Composition of capital Structure.
PENGARUH KUALITAS JASA PELAYANAN DAN KUALITAS JASA CETAK TERHADAP KEPUASAN PELANGGAN
Authors: Sukartaatmadja Iswandi , Rifqy Dihya Nur
Published: August 2023

This research is aimed at investigating the effect of service quality on consumers ' satisfaction. Using quantitative approach as the method, there are 100 respondents in this research. There are two independent variables and one dependent variable. First independent variable is service quality and second independent variable is printing quality and the dependent variable is customer satisfaction. This research uses multiple regression linear method. The equation of the regression is Y=2,089+0,323+0,466. First independent variable 's value is 3,917 and the second Independent variable 's value is 4,465 which means there are positive and significant effect for customer satisfaction. Simultaneous hypothesis and partial hypothesis tests show significant and positive results from the independent variables to dependent variable.

Keyword: Service Quality and Printing Quality to Customer Satisfaction
Pengaruh Dana Alokasi Umum, Pendapatan Per Kapita Dan Kemiskinan Terhadap Pendapatan Asli Daerah Kabupaten/Kota Di Provinsi NTT
Authors: Kale Patris Enos Rihi Kana , Nanga Muana
Published: August 2023

The study is aimed to investigate the effect of general purposes transfer (DAU), per capita GRDP and poverty rate on own sources revenue (PAD) for District level in Province of East Nusa Tenggara (NTT). To estimate the effect of DAU, per capita GRDP and poverty rate on PAD, the panel data regression model are used that is model based on panel data (combination of time series and crosssection data); and pooled least squares (PLS), fixed effect model (FEM) and random effect model (REM) methods are used to estimate the regression model. The result shows that all independent variables that is DAU, per capita GDRP and poverty rate has significant statistical effect on PAD in Province of East Nusa Tenggara. The findings in this study has an important policy implication for the regional and central govemment, that is, to increase PAD di regional level, DAU and per capita GRDP should be incrased, and the contrary, poverty reduction in regional level should be continously conducted by the government at all level.

Keyword: general purpose transfer, own source revenue
Implementation Of Environmental Management System And Pro-Environmental Behaviour To Achieve Sustainable Industrial Performance For Hotels
Authors: Rainanto Bambang Hengky , Qhalby Juwita
Published: August 2023

The COVID-19 pandemic has affected the world of tourism, especially in the hotel industry. Movement and travel restrictions, changes in human behaviour while traveling, as well as the existence of several regulations from the central government of Indonesia and local governments affect tourist visits and occupancy rates in hotels. As in large and star hotels, small hotels and non-star hotels have also been affected by the COVID-19 pandemic. This research was conducted in East Java Province, Indonesia, involving 161 non-star hotels during the data collection period in March and April 2020, namely in the early months of the Covid-19 Pandemic in Indonesia. The measurement parameters for the independent variables are Environmental Management System (EMS) and Pro-Environmental Behaviour (PEB), while the dependent variable is Sustainable Industry Performance. Research analysis using Smart-PLS 2.0. The conclusions of this study indicate that in the early months of the COVID-19  pandemic the Environmental Management System and Pro-Environmental Behaviour had a significant and positive effect on Economic Sustainability, with the strongest influence being given by Pro-Environmental Behaviour; only Pro-Environmental Behaviour has a significant and positive influence on Environmental Sustainability; Environmental Management System and Pro-Environmental Behaviour have a significant and positive influence on Social Sustainability, with the strongest influence exerted by the Environmental Management System.

 

Keywords: Environmental Management System (EMS), Pro-Environmental Behaviour (PEB), Sustainable Industrial Performance, Non-Star Hotels, COVID-19 Pandemic
Cap II. ¿A qué se refiere un problema de investigación en la investigación cuantitativa?
Authors:   Universidad Cesar Vallejo, Ordoñez Yaipén Rossana del Pilar , Figueroa Coronado Erick Carlo ,   Universidad César Vallejo, Huamán Almonacid Genrry Smith ,   Universidad César Vallejo, Ponce Yactayo Dora Lourdes ,   Universidad César Vallejo
Published: August 2023

La investigación es un proceso de gran impacto en cualquier ámbito; sin embargo, en el mundo académico y científico ha sido objeto de resistencia, tabú y mitos que entorpecen el desarrollo apropiado de competencias y habilidades en estudiantes de todos los niveles para la investigación; en general, son variadas las connotaciones negativas asociadas a la investigación, por tal razón, el capítulo que se presenta a continuación tiene como objetivo describir cómo se elabora un planteamiento del problema desde el enfoque cuantitativo de investigación. De esta forma el capítulo se diseña con ejercicios prácticos y ejemplos que permiten al lector comprender fácilmente el qué, para qué y por qué de la definición del problema. En el desarrollo se hizo uso de la metodología documental bibliográfica y hemerográfica, revisando bases de datos tales como Redalyc, Dialnet, Scielo, así como repositorios de instituciones universitarias para la selección de los documentos que sirven como referencia. Se consideró su similitud, así como el uso de los criterios más comúnmente requeridos por las revistas científicas e instituciones educativas, de forma tal que su contenido pueda servir de modelo para los lectores. El planteamiento del problema se constituye como la clave para garantizar claridad en el camino a recorrer en la ejecución de una investigación, su definición asertiva contextualiza el interés de la investigación, advirtiendo así su alcance e impacto en la sociedad.
Cap III. Construcciones teóricas en procesos de investigación científica
Authors:   Universidad César Vallejo, Meleán Romero Rosana , Guerrero Bejarano María Auxiliadora ,   Tecnológico Universitario Espíritu Santo, Carhuancho Mendoza Irma Milagros ,   Universidad César Vallejo, Torres Granadillo Fernando ,   Universidad del Zulia
Published: August 2023

Precisar elementos centrales para construir el cuerpo teórico de un producto científico, a partir del establecimiento de lineamientos teóricos prácticos necesarios para sustentar procesos de investigación de corte científica, es el objetivo de esta investigación. Se enfatiza una ruta de trabajo de manera que un estudiante a nivel de pregrado, especialidad, maestría e incluso doctorado, así como investigadores nóveles o consolidados, puedan seguir para elaborar el constructo teórico de la investigación, sea esta de orden cualitativa, cuantitativa o mixta. Desde el plano metodológico, se proyecta una investigación de corte documental, con énfasis en la descripción, análisis, reflexión y proyección de rutas de trabajo desde el pragmatismo, la sencillez y la racionalidad. Existen elementos centrales a considerar al elaborar las diferentes secciones que forman parte del cuerpo teórico de un producto científico, entre ellos, los antecedentes o estado del arte, según el producto que corresponda; fundamentos o marco teórico, sistema teórico como enriquecimiento del cuerpo teórico, sumando también lineamientos necesarios para lograr adecuadas categorizaciones u operacionalizaciones de los temas centrales. Adoptar prácticas que permitan realizar construcciones teóricas con aportes reales y válidos al conocimiento científico.
Cap IV. Paradigmas de investigación
Authors:   Universidad César Vallejo, Nolazco Labajos Fernando Alexis , Menacho Carhuamaca Jaime David ,   Universidad César Vallejo, Moreno Rodríguez Rosa Ysabel ,   Universidad Autónoma del Perú, Manosalvas Vaca Carlos Aníbal ,   Universidad Estatal Amazónica del Ecuador
Published: August 2023

El estudio de los paradigmas en una investigación científica ha cobrado interés en los últimos años con la alta proliferación de producciones investigativas en los diversos ámbitos académicos. El propósito de este estudio consiste en analizar la relevancia de las principales publicaciones científicas entorno a los paradigmas de investigación. Se tuvo una metodología por selección de documentos basándose en la revisión sistémica que abordó producciones de los últimos años de importantes investigadores internacionales. Los resultados mostraron que los paradigmas positivistas, neopositivista, sociocrítico y hermenéutico son los más relevantes en las producciones por predisponerse con mayor énfasis a la realidad problemática. Por lo tanto, se concluyó en la importancia de los paradigmas como referentes de orientación teórica metodológica para el avance innovador y del conocimiento científico.
SELF-REGULATED LEARNING AND CREATIVE THINKING SKILLS OF ELEMENTARY SCHOOL STUDENTS IN THE DISTANCE EDUCATION DURING THE COVID-19 PANDEMIC
Authors: Maryani Ika , Estriningrum Ummu , Nuryana Zalik
Published: August 2023

The research aimed to know the relation between self-regulated learning and creative thinking skills of elementary school students in the distance education during COVID-19 pandemic. Self-regulated learning and creative thinking skills are needed by elementary school students. They train the students’ cognitive development during the learning process and prepare them for the next educational level. Teachers should guide, encourage, and implement appropriate learning strategies to improve the students’ self-regulated learning and creative thinking skills. It employed a quantitative approach with ex post facto and survey methods. The sample was 121 elementary school students taken randomly in Sleman Regency, Indonesia. The data were collected using a Likert scale questionnaire. The results showed that the students’ self-regulated learning level was in the moderate category, which was the highest frequency. The creative thinking skills also reached the same level and frequency. Further, self-regulated learning and creative thinking skills were correlated with a high correlation coefficient rate (R = 0.856). Therefore, it is recommended that teachers use a learning method that can activate and develop the self-regulated learning to increase the students’ creative thinking skills.
THE INFLUENCE OF INFORMATION ON RESIDENTS’ GREEN HOUSING PURCHASING BEHAVIOR: DIFFERENT INFORMATION CONTENTS AND PROVIDERS
Authors: He Chenchen , Liu Xuan , Bi Jiahui , Wang Xiaohua , Li Jiaxin
Published: August 2023

To promote consumers to buy green housing, the paper tries to find the effect of information on consumers’ green housing purchasing behavior. It classifies the contents and providers of information and explores their different influences. The results show that: 1) Consumers’ age and environmental protection attitude have a significant impact on their purchasing behavior, while consumers’ gender and monthly income have no significant impact; 2) Consumers are more affected by information relating to the economy and indoor air quality. The detailed order of influence is as follows: information on loan at concessionary rates > cost saving in usage phase > indoor air quality > waste classification > investment benefit > carbon emission reduction > thermal comfort > acoustic environment > greening rate > luminous environment; 3) Consumers with higher environmental awareness care more about the information on living environment and carbon emission. Whereas, those with low awareness of environmental protection are more affected by information on economic benefits. 4) Regarding different information providers, the consumers are mostly impacted by the government, while the information from developers could induce limited effects. It could guide the government and developers to provide appropriate information to promote GH purchasing behavior.
Planetesimal Accretion at Short Orbital Periods
Authors: Wallace Spencer C. , Quinn Thomas R.
Published: August 2023

Formation models in which terrestrial bodies grow via the pairwise accretion of planetesimals have been reasonably successful at reproducing the general properties of the Solar System, including small-body populations. However, planetesimal accretion has not yet been fully explored in the context of the wide variety of recently discovered extrasolar planetary systems, in particular those that host short-period terrestrial planets. In this work, we use direct N-body simulations to explore and understand the growth of planetary embryos from planetesimals in disks extending down to ≃1 day orbital periods. We show that planetesimal accretion becomes nearly 100% efficient at short orbital periods, leading to embryo masses that are much larger than the classical isolation mass. For rocky bodies, the physical size of the object begins to occupy a significant fraction of its Hill sphere toward the inner edge of the disk. In this regime, most close encounters result in collisions, rather than scattering, and the system does not develop a bimodal population of dynamically hot planetesimals and dynamically cold oligarchs, as is seen in previous studies. The highly efficient accretion seen at short orbital periods implies that systems of tightly packed inner planets should be almost completely devoid of any residual small bodies. We demonstrate the robustness of our results to assumptions about the initial disk model, and we also investigate the effects that our simplified collision model has on the emergence of this non-oligarchic growth mode in a planet-forming disk.
Exploring the past, present, and future of postoperative radiotherapy for N2 stage non-small cell lung cancer
Authors: Kim Byoung Hyuck , Kim Jae Sik , Kim Hak Jae
Published: August 2023

Despite conventionally applied postoperative radiotherapy (PORT) in pathological N2 (pN2) stage non-small cell lung cancer (NSCLC) considering high locoregional recurrence, its survival benefit has been a continuous topic of debate. Although several randomized clinical trials have been conducted, many of them have been withdrawn or analyzed without statistical significance due to slow accrual, making it difficult to determine the efficacy of PORT. Recently, the results of large-scale randomized clinical trials have been published, which showed some improvement in disease-free survival with PORT, but finally had no impact on overall survival. Based on these results, it was expected that the debate over PORT in pN2 patients with NSCLC would come to an end. However, since pN2 patients have different clinicopathologic features, it has become more important to carefully select the patient population who will benefit from PORT. In addition, given the development of systemic treatments such as molecular-targeted therapy and immunotherapy, it is crucial to evaluate whether there is any benefit to PORT in the midst of these recent changes. Therefore, determining the optimal treatment approach for NSCLC pN2 patients remains a complex issue that requires further research and evaluation.
All records of rodents (Mammalia, Rodentia) and hares (Mammalia, Lagomorpha) in Georgia from 1855 through to 2022
Authors: Buknikashvili Alexander , Kandaurov Andrei , Sheklashvili Giorgi , Natradze Ioseb
Published: August 2023

In Georgia, there are 40 species from 21 genera and nine families of rodents, along with one species from a single genus and a family of hares. The dataset, which includes 3146 records, provides information regarding the presence of these species within 1559 locations. Of the total of 3146 records, 285 records from 281 locations belong to hares, while 2864 records from 1394 locations are associated with rodents. The dataset incorporates data sourced from various institutions, including the Collection of the Institute of Zoology of Ilia State University, the Georgian National Museum, the Collection of the Zoological Institute of Russian Academy of Sciences, the Zoological Museum of Moscow State University, as well as data extracted from literature and our own field data. The method for establishing the dataset included data compilation from all the above-mentioned sources. The dataset includes records from 1855 through to 2022.

In this publication, out of 3146 records, 14.9% are our new unpublished data. The unpublished data were collected from 2004 through to 2022. In total, 26% of all records are literature data, 50% are museum data and 24% are data collected by us. The dataset includes data obtained from literature sources, museum collections and the field observations. It includes occurrences of species found in the same locality, but within different years, resulting in separate records for each location. The dataset provided has the potential to significantly contribute to our understanding of the distribution of rodents and hares in Georgia.
Peruvian nudibranchs (Mollusca, Gastropoda, Heterobranchia): an updated literature review-based list of species
Authors: Grández Alessandra , Ampuero André , Barahona Sergio P.
Published: August 2023

Nudibranchs, as a group, have received limited attention in terms of scientific study along the coastline of Peru. Here, an updated and comprehensive list of nudibranch species found in the Peruvian sea is presented, compiled through an extensive review of relevant literature. This compilation encompasses a total of 31 species, classified into two suborders, 10 superfamilies, 20 families, and 28 genera. With respect to the biogeographic provinces along the Peruvian coast, 23 species inhabit the Warm Temperate Southeastern Pacific province, 18 species occur in the Tropical Eastern Pacific province, and 10 species are found in both provinces, crossing the transitional zone between them. In terms of distribution patterns, two species exhibit a cosmopolitan distribution (Glaucus atlanticusandFiona pinnata), while two species display a circumtropical distribution (Cephalopyge trematoidesandPhylliroe bucephala). One species exhibits a bipolar distribution in the Eastern Pacific and possesses an amphi-South American distribution (Rostanga pulchra). Additionally, six species exhibit an amphi-South American distribution (Rostanga pulchra,Diaulula punctuolata,Doto uva,Tyrinna evelinae,Tyrinna delicata, andDoris fontainii), and two species are endemic to Peru (Corambe mancorensisandFelimare sechurana). This study provides comprehensive information on biogeographical aspects, geographical distributions, and taxonomic updates within the nudibranch species documented in Peru. Furthermore, we discuss the status of species listed in previous literature that have not been confirmed by collections, referring to them as potentially occurring species.
Neural-SEIR: A flexible data-driven framework for precise prediction of epidemic disease
Authors: Wang Haoyu , Qiu Xihe , Yang Jinghan , Li Qiong , Tan Xiaoyu , Huang Jingjing
Published: August 2023

Accurately modeling and predicting epidemic diseases is crucial to prevent disease transmission and reduce mortality. Due to various unpredictable factors, including population migration, vaccination, control efforts, and seasonal fluctuations, traditional epidemic models that rely on prior knowledge of virus transmission mechanisms may not be sufficient to forecast complex epidemics like coronavirus disease 2019(COVID-19). The application of traditional epidemiological models such as susceptible-exposed-infectious-recovered (SEIR) may face difficulties in accurately predicting such complex epidemics. Data-driven prediction approaches lack the ability to generalize and exhibit low accuracy on small datasets due to their reliance on large amounts of data without incorporating prior knowledge. To overcome this limitation, we introduce a flexible ensemble data-driven framework (Neural-SEIR) that "neuralizes" the SEIR model by approximating the core parameters through neural networks while preserving the propagation structure of SEIR. Neural-SEIR employs long short-term memory (LSTM) neural network to capture complex correlation features, exponential smoothing (ES) to model seasonal information, and prior knowledge from SEIR. By incorporating SEIR parameters into the neural network structure, Neural-SEIR leverages prior knowledge while updating parameters with real-world data. Our experimental results demonstrate that Neural-SEIR outperforms traditional machine learning and epidemiological models, achieving high prediction accuracy and efficiency in forecasting epidemic diseases.
Altered Metabolic Phenotypes and Hypothalamic Neuronal Activity Triggered by Sodium-Glucose Cotransporter 2 Inhibition
Authors: Lee Ho Gyun , Jung Il Hyeon , Park Byong Seo , Yang Hye Rim , Kim Kwang Kon , Tu Thai Hien , Yeh Jung-Yong , Lee Sewon , Yang Sunggu , Lee Byung Ju , Kim Jae Geun , Nam-Goong Il Seong
Published: August 2023

Background: Sodium-glucose cotransporter 2 (SGLT-2) inhibitors are currently used to treat patients with diabetes. Previous studies have demonstrated that treatment with SGLT-2 inhibitors is accompanied by altered metabolic phenotypes. However, it has not been investigated whether the hypothalamic circuit participates in the development of the compensatory metabolic phenotypes triggered by the treatment with SGLT-2 inhibitors.Methods: Mice were fed a standard diet or high-fat diet and treated with dapagliflozin, an SGLT-2 inhibitor. Food intake and energy expenditure were observed using indirect calorimetry system. The activity of hypothalamic neurons in response to dapagliflozin treatment was evaluated by immunohistochemistry with c-Fos antibody. Quantitative real-time polymerase chain reaction was performed to determine gene expression patterns in the hypothalamus of dapagliflozin-treated mice.Results: Dapagliflozin-treated mice displayed enhanced food intake and reduced energy expenditure. Altered neuronal activities were observed in multiple hypothalamic nuclei in association with appetite regulation. Additionally, we found elevated immunosignals of agouti-related peptide neurons in the paraventricular nucleus of the hypothalamus.Conclusion: This study suggests the functional involvement of the hypothalamus in the development of the compensatory metabolic phenotypes induced by SGLT-2 inhibitor treatment.
Student Reactions to Learning Theory Based Curriculum Materials in Linear Algebra - A Survey Analysis
Authors: Cooley Laurel , Vidakovic Draga , Martin William O. , Dexter Scott , Suzuki Jeff
Published: August 2023

This report examines students' perceptions of the implementation of carefully designed curriculum materials (called modules) in linear algebra courses at three different universities. The curricular materials were produced collaboratively by STEM and mathematics education faculty as members of a professional learning community (PLC) over several years.
Course Redesign to Improve Pre-service Teacher Engagement and Confidence to Teach Mathematics: A Case Study in Three Parts
Authors: Larkin Kevin
Published: August 2023

This article examines pedagogical changes to a mathematics education course for preservice teachers (PSTs) over a three-year period. Transactional Distance Theory (TDT) is used as a conceptual framework underpinning the course redesign. A case study of one campus (Campus A) is presented. It is chosen for analysis because, of the three campuses on which this course is taught, it is this Campus that starkly illuminates the unfolding, three-year drama of course redesign.
Students' Extrinsic and Intrinsic Motivation Level and its Relationship with their Mathematics Achievement
Authors: Acar Güvendir Meltem
Published: August 2023

This study focused on the extrinsic and intrinsic motivation levels of eighth grade students and its relationship with their mathematical achievement. The participants of the study included 6829 students who took TIMSS in 2011 and 239 mathematics teachers. The data obtained from the student and teacher questionnaires that are included in the content of TIMSS exam were used.
A Comparative Study of Students Attitudes towards Mathematics in Two Different School Systems
Authors: Prendergast Mark , Hongning Zhang
Published: August 2023

Much research has been carried out in the history of mathematics education to find the factors that influence student achievement in the subject. Among these factors, student attitude towards mathematics has been consistently studied. There has often been a correlation found between students' attitudes and their achievement. In recent years Chinese students have consistently scored in the top band in mathematics international comparison tests while Irish students have been ranked at either side of the average mark. This study is in part motivated to explain why Chinese students appear to do so well in these international comparisons and whether differences in students' attitudes may play a key role. The attitudes towards mathematics of a cohort of 15 to 16 year old students in two selected schools in Ireland and China will be compared. This is a sample of students from one school in each country and so caution should be applied and the results should not be generalised. However there are some noteworthy findings which upon further investigation may have implications for policy makers and mathematics educators in both countries.
Realistic real world contexts: Model eliciting activities
Authors: Doruk Bekir Kürşat
Published: August 2023

Researchers have proposed a variety of methods to make a connection between real life and mathematics so that it can be learned in a practical way and enable people to utilise mathematics in their daily lives. Model-eliciting activities (MEAs) were developed to fulfil this need and are very capable of serving this purpose. The reason MEAs are so effective is the series of principles that should guide the development of these activities. This study aims to determine how one of these principles, the "reality" principle, is reflected in a MEA activity and to investigate participants' opinions of the realistic context of MEA. As a result of analysing work from pre-service teachers (PTs) who engaged in process during a MEA, and data acquired in interviews conducted after the activity, it was found that these activities of realistic real life contexts played a significant role in highlighting the various advantages and challenges of MEAs that have been reported by authors of past studies. These results are used to argue for mathematics instruction to include MEAs that promote connecting real life and mathematics in the classroom, and understanding different aspects of mathematics in real life.
Primary Mathematics Teacher Education Encountering Difficult Terrain: A Personal Perspective
Authors: Norton Stephen
Published: August 2023

This paper is a case study in preparing prospective primary teachers to teach mathematics at one Australian university. The paper describes the content knowledge of prospective teachers, pre and post a final mathematics curriculum subject. The teaching approach which attempts to account for both content and pedagogical content knowledge is described. The constraints with respect to time and delivery mode are documented as well as the strategies used to maximise learning opportunities. The findings suggest that current mechanisms of student entry enable students with low levels of personal mathematics to enter and indeed pass teacher education courses. The data suggest there is merit in considering specialist or part-specialist primary teachers of mathematics or in extending teacher preparation time in pre-service teaching programs and refocusing their intent to better account for prospective teachers' knowledge of mathematics which is widely considered essential for effective teaching of the discipline.
Steel, Corrosion- and Heat-Resistant, Welded Tubing 12Cr - 8.5Ni -
0.30Cb - 1.1Ti - 2.0Cu Vacuum Induction Plus Consumable Electrode Vacuum Melted
Solution Heat Treated, Precipitation Hardenable
Authors:   AMS F Corrosion and Heat Resistant Alloys Committee
Published: August 2023

This specification covers a premium-quality corrosion- and heat-resistant steel in the form of welded and drawn tubing.