bluuebunny/crossref_metadata_2025 huggingface dataset:
Investigación sobre método de predicción de divorcio en aprendizaje automático
Authors: Mendoza Canales Aurón Eduardo
Published: January 2024

The present investigation shows a list of important data for the prediction of divorce in machine learning. The model of the current repository is made, with 170 records and 54 variables, integer attribute type, with characteristics of the multivariate, univariate data set. The Rapid Miner program was obtained to process all the information, following the steps, as mentioned in the flowchart, see Figure 3, and the best method of the Decision Tree and Deep learning simulator was obtained. Where I throw the best 4% error result, it has better performance, less error and the determining algorithms are the variables that most influence the positive and negative.
Metodología de comparación de técnicas de corto plazo para el pronóstico de la producción de energía eléctrica de plantas solares fotovoltaicas
Authors: Yajure Ramírez César Aristóteles
Published: January 2024

There is increasing awareness about the need to use renewable energy sources to produce electricity. Among these sources, photovoltaic solar energy stands out due to its great growth in recent years, and the possibility that photovoltaic solar plants have of operating in on-grid and off-grid modes. In either case, it is important to have a forecast of the plant's electrical energy production. In this research, a methodology is proposed to compare the short-term forecasts of the electrical energy produced by a photovoltaic solar plant, using machine learning algorithms, time series analysis, and making use of the historical data of the production of the plant and climatic variables. Forecast models were obtained with data in both hourly temporal resolution and fifteen-minute temporal resolution. The performance metrics used in the evaluation of the models were: R2, RMSE, MAE, and MAPE. For the resolution of fifteen minutes, both models, artificial neural network, and K nearest neighbors, fulfilled the statistical assumptions, but the network model had the lowest values of the metrics. For hourly resolution, again the artificial neural network model had the best performance over the ARIMA model of time series analysis.
Inteligencia artificial aplicado en la detección del discurso de odio en el contexto político social a principios del año 2023 en el Perú
Authors: Torres Talaverano Luz Elena , Rojas Villanueva Paula Elianne , Huamán Ampuero Lucero Marysol , Rodriguez Rodriguez Ciro , Petrlik Azabache Ivan Carlo
Published: January 2024

The rapid spread of hate speech through social networks to a large number of people has generated destabilization in a social and economic context at the beginning of the year 2023. The purpose of the research is to detect hate speech through Artificial Intelligence with Machine Learning techniques in a social political context. In addition, the research is of an applied type in which an exploratory search was carried out and the population is comprised of 1,970 tweets in the central and southern regions of Peru. The sampling is probabilistic, and 1,970 tweets from the regions involved were reviewed and manually labeled. Likewise, the methodology applied was SEMMA, as it allows to ensure that the models are accurate and fit the data of this study. A comparison of the respective models was performed to achieve an optimal result, of which the main indicator was the average accuracy in which the Multinomial Naive Bayes model was the best model with a score of 73.87%. Finally, it is concluded that this study allows accelerating the process of detecting verbal hate speech in social networks for the analysis of public opinion and the detection of suspected hate inciters.
Prototipo de un Invernadero automatizado hidropónico NFT con dos microclimas para el hogar basado en Internet de las cosas
Authors: Puelles Bulnes Maria Elizabeth
Published: January 2024

Ensuring food security and sustainability at the global level is one of the current major challenges. This challenge is intensified by the various prospects for population growth and conventional farming methods that are unable to meet the global demand for food. In the last decades, with advancing technology, automated hydroponic greenhouses have been gaining prominence in agricultural fields and urban areas including homes. One of the technological applications highlighted is to enable constant control monitoring of ideal parameters for cultivation. Thus, this article aims to design and implement a prototype of an automated hydroponic greenhouse with the NFT (Nutrient Film Technique) system with two microclimates for the home, bringing practicality to the user with the autonomy of the system and obtaining various plants, vegetables, or vegetables free of fertilizers, good quality and low cost. The microclimates of the greenhouse are intended for a variety of plants, including medicinal, aromatic or ornamental plants, as well as short and long-stemmed vegetables and vegetables. Market research was performed as a first stage for the validation of low fidelity in order to know the potential customers, plants, and vegetables of customer preference as well as the appropiate dimensions of the greenhouse prototype to be installed at homes. After that, an Internet of Things (IoT) platform was used as an engineering project and the transmission of the measured data through cloud computing was used to help the data process in a remote server for the control and automation of the hydroponic greenhouse.
Los entornos virtuales y el aprendizaje significativo en estudiantes universitarios de la Facultad de Educación de la UNMSM
Authors: Villanueva Salas Elsa A.
Published: January 2024

Los cambios recientes en la educación superior son desafiantes y trascendentales; en ese contexto, la impartición de clases en los entornos virtuales exige una exhaustiva preparación, dedicación y constante retroalimentación para que se produzcan los Aprendizajes significativos en los estudiantes universitarios de la Facultad de Educación de la UNMSM. El objetivo de este artículo es determinar de qué manera se relacionan los entornos virtuales y el aprendizaje significativo de los estudiantes. El enfoque es cuantitativo diseño no experimental, nivel correlacional y tipo básica. La muestra estuvo conformada por 105 alumnos y como instrumento de recolección de datos se utilizó la encuesta a través de un cuestionario de 20 ítems para cada uno de las variables de investigación. La validez se realizó por juicio de expertos, con una confiabilidad de Alfa de Cronbach mayor 0,94 y 0,96 resultando que ambas variables tienen una confiabilidad aceptable y procede para su aplicación, de esta manera la correlación de Pearson fue 0,853, demostrando que hay una fuerte relación positiva entre los entornos virtuales y el aprendizaje significativo, esto implica que el uso de herramientas y plataformas virtuales mejora la calidad y efectividad del proceso de aprendizaje, fomentando una comprensión más profunda y duradera de los contenidos. En conclusión, los EV usados correctamente es un instrumento útil y eficaz para mejorar el aprendizaje en comparación con otros métodos tradicionales.
Mejora del proceso de desarrollo de software en instituciones públicas del Perú incorporando el método COSMIC: caso de estudio en el OSINFOR
Authors: Marca Quispe Raul , Bautista Ubillús Efraín R.
Published: January 2024

Uno de los principales retos cuando se administra proyectos de software es determinar el esfuerzo que se necesita para la entrega del producto, y en el Perú, las entidades públicas están enmarcadas en el cumplimiento normativo por lo que se ha incrementado el uso de enfoques ágiles debido a la incertidumbre en la medición del tamaño del software. En ese sentido, a través de la presente investigación se realizó la mejora al proceso de desarrollo para el OSINFOR incorporando el método COSMIC para medir el tamaño del software y determinar el esfuerzo para los desarrollos. El proceso mejorado ha sido analizado en dos casos de estudio para corroborar la medición estándar y el uso del enfoque de aproximación del método COSMIC. Finalmente, como resultado se ha demostrado que la incorporación de actividades de medición considerando el estándar COSMIC mejora el proceso para la construcción de software logrando un 75% en cumplimiento de las actividades, 75% en la eficiencia de la medición y 76% en la satisfacción del uso del proceso mejorado.
Abriendo la caja negra de un proyecto fallido de agua potable. El caso del Proyecto Integral de Agua Potable en la ciudad de Pasco desde la Teoría del Actor-Red
Authors: Aguilar Pável
Published: January 2024

Esta investigación recurre a la caja de herramientas de la Teoría del Actor-Red para abrir la caja negra detrás del colapso del Proyecto Integral de Agua Potable de Pasco, una ambiciosa intervención pública infraestructural suscitada tanto por las condiciones locales de contaminación como por la carencia del recurso hídrico. Se trabajó con una metodología cualitativa centrada en rastreo de procesos mediante el análisis de las narrativas multisituadas acerca de humanos y no-humanos. Se empleó observación no-participante, análisis documentario y entrevistas semi-estructuradas anónimas a catorce portavoces del proyecto. Los resultados sugieren que el colapso del proyecto se produjo por la fragilidad del sistema de alianzas puesto que los portavoces no pudieron centralizar la gestión de la Red Local de implementación ni mediar las controversias sociotécnicas en torno al agua, dada su naturaleza multidimensional.
Presentación
Authors: Calderón Cockburn Julio , Loayza Javier Jerjes
Published: January 2024

La revista de Sociología número 35 se publica en un difícil contexto de la realidad peruana, caracterizada por la crisis política que, aunque respon-diendo a factores histórico estructurales, se agudiza a partir del 28 de julio del 2016 por el conflicto de poderes entre el ejecutivo y el parlamento. La crisis da cuenta de la imposibilidad de construir y desarrollar una agenda de política pública al servicio de las mayorías olvidadas del país, y de configurar un camino viable para la nación. En estos momentos, la crisis actual está dando lugar a la convulsión social, la mella de la democracia representativa, los extremos de las posturas políticas y la continuidad de la débil conciencia de ciudadanía en el país.
Análisis discursivo de la emergencia del concepto de hábitat en el marco de los Organismos Internacionales
Authors: Sesma María Inés
Published: January 2024

El siguiente artículo se propone mostrar cómo, por qué y para qué la categoría discursiva de hábitat, fue y es configurada por los organismos internacionales de acuerdo a nociones dominantes, en el marco del proyecto de desarrollo. Para ello, se muestran las diferentes tematizaciones que se hacen del hábitat en tres grandes épocas en función de las Conferencias sobre Hábitat celebradas por la Organización de las Naciones Unidas (HABITAT I, II y III), para poder encontrar en cada una de estas las particularidades discursivas que conformaron los “regímenes de verdad” en torno al hábitat. Para el análisis, se toman la propuesta teórica y analítica de   Michel   Foucault   en   torno al discurso y los aportes de Arturo Escobar sobre el concepto de desarrollo. Partiendo de la hipótesis de que estas nociones dominantes de hábitat son posibles de ser agrupadas bajo la noción de “hábitat urbano”, como aquel espacio en donde convergen formas “legítimas” de habitar, el artículo invita a pensar desde una perspectiva crítica sobre el significado y la implicancia de abordar al hábitat desde discursos dominantes.
Política cultural en contextos de crisis: las encrucijadas de la Política Nacional de Cultura del Perú al 2030
Authors: Lossio Chávez Félix Antonio
Published: January 2024

Este artículo tiene como argumento central que la política y gestión cultural en el Perú ocurre en un contexto de dinamismos desarticulados y consolidación precaria, lo que desestabiliza, pero al mismo tiempo exige, una narrativa articuladora de su marco orientador, la Política Nacional de Cultura al 2030. En particular, se sostiene que el escenario que define la política y gestión cultural actual en el Perú se caracteriza, por un lado, por avances notables tanto desde la sociedad civil como del sector público y privado en distintos aspectos del campo cultural, así como por la afirmación de consensos con relación a nuevos enfoques para el desarrollo del sector. Pero también, y en simultáneo, por la incertidumbre institucional-administrativa, las múltiples crisis y la ausencia de horizontes políticos con relación al campo de la cultura. Ello, tiene como resultado una Política Nacional de Cultura al 2030 (PNC 2030) que parte de premisas necesarias y enfoques en sintonía con la agenda cultura global, que se basa en evidencias sólidas y que traza objetivos necesarios para el fortalecimiento del sector en el país; pero que es incierta respecto a su sostenibilidad, resultados y legitimidad social. Entonces, este artículo sugiere que la PNC 2030 —y la gestión cultural en el Perú— tienen como principal desafío actuar en un escenario sin garantías y, desde allí, recuperar su dimensión ético-política haciendo uso de las herramientas de la administración pública.
Maternidades tardías en la Ciudad de Buenos Aires: experiencias y voces de mujeres que son madres a partir de los 35 años
Authors: Astorino Julieta
Published: January 2024

En la Ciudad de Buenos Aires, observamos una disminución constante de la fecundidad desde el año 2008 aproximadamente. En la actualidad (datos a 2022), la tasa global de fecundidad se encuentra en 1,48 hijos por mujer, lo que significa que está por debajo del nivel necesario para el reemplazo generacional. Además, la edad promedio de las madres es de 32,4 años, siendo de 31,1 años para las madres primerizas y de 33,5 años para aquellas que ya han tenido hijos. Estos datos indican que las mujeres en la Ciudad de Buenos Aires tienen menos descendencia y a edades más avanzadas o tardías. El propósito de este artículo es reflexionar sobre esta tendencia, tomando como punto de partida los testimonios de mujeres que se convirtieron en madres después de los 35 años. Estos testimonios nos permiten comprender sus vivencias en relación con la maternidad tardía, poniendo un enfoque especial en sus prácticas culturales y sus percepciones sobre la familia, la maternidad, entre otros aspectos. Se trata de un trabajo de investigación cualitativo, basado en la realización de entrevistas en profundidad. Esta indagación forma parte del trabajo de tesis doctoral «¿Quién dice que es tarde? Experiencias de maternidad después de los 35 años en la Ciudad de Buenos Aires.».
Hacia una epistemología exploratoria para el ejercicio de ciudadanía digital: elementos para su construcción
Authors: Boglione Matias Federico
Published: January 2024

La tecnología, ahora convertida en mediación cultural, se ha vuelto transversal a la vida de las personas, configurando verdaderos “ecosistemas comunicativos” de la sociedad que posibilitan nuevos espacios de lucha y resistencia cultural y mediática. Es debido al auge de estas nuevas espacialidades que este trabajo se propone un acercamiento a las problemáticas que giran en torno al ejercicio de las nuevas ciudadanías digitales, haciendo especial énfasis en la apropiación tecnológica y las prácticas de activismo mediático como formas de resistencia; para, a partir de ello, presentar un repertorio de herramientas epistemológicas que contribuyan a describir y comprender acciones y experiencias del ejercicio ciudadano en entornos digitales.
The numerical simulation of military skills
Authors: Pincevičius Albertas , Rakauskas Rimantas-Jonas , Misevičius Gintautas
Published: January 2024

There is not abstract.
Parabolic (φ, ξ, η, g, λ)-structures of second kind on hypersurfaces of dual metric 4-dimensional spaces
Authors: Baškienė Angelė
Published: January 2024

Parabolic metric (φ, ξ, η, g, λ)-structures of second kind on hypersurfaces of 4-dimensional dual metric space and its properties are investigated. Some examples of normal, integrable parabolic metric structures of second kind are given.
On zeros of the derivative of the Lerch zeta-function
Authors: Garunkštis Ramūnas
Published: January 2024

We consider zeros of the derivative of the Lerch zeta-function. We obtain some lower bound for the number of zeros lying on the right from the critical line.
About uniform distribution of four-dimensional torus
Authors: Kryžienė Birutė , Misevičius Gintautas
Published: January 2024

Results on the uniform distribution of ergodic endomorphisms on the four-dimensional torus are obtained. They extend previous results [1] for the case when the characteristic polynomial of matrix V may be reducible.
On generalized Euler constants
Authors: Stankus Eugenijus
Published: January 2024

The generalized Euler constants are defined by formulas

γ(r, k) = limx → ∞ {∑0 < n ≤  x; n ≡  r(mod k) ⅟n - ⅟k log x}.

The explicit formula for γ(r, k) is obtained applying the method of contour integration.
On the zeros of the derivative of Dedekind zeta-functions
Authors: Šleževičienė Rasa
Published: January 2024

There is not abstract.
Асимптотические свойства мартингальных оценок процессов восстановления
Authors: Kanišauskas Vaidotas
Published: January 2024

There is not abstract
Modelling of the VU budget means alocation
Authors: Pikturna Aleksas , Ivanauskas Feliksas , Lapcun Bogdan
Published: January 2024

Quantitative tools for the budget in higher education have appeared in great number in last decade of last century. Two approaches of the mathematical modelling have appeared in higher education: the package model and locally designed model. Package models employ generalized re­lationships that are applicable to behavior in many different settings. These models seems to be the least utilized of the quantitative tools. Locally designed models simulate behavior or a process in a specific setting. This paper analyze one locally designed model – Vilnius University budget allo­cation (among departments) model. Calculations have been made using data of Vilnius University administration.
Неоднородная краевая задача Римана с неограниченным коэффициентом логарифмического порядка для полуплоскости
Authors: Alekna Petras
Published: January 2024

There is not abstract.
The asymptotic stability for a system of nonlinear PDEs
Authors: Golokvosčius Petras
Published: January 2024

The asymptotic stability of a system of nonlinear PDEs is proved.
Система уравнений Шредингера с неоднородной нелинеиной частью
Authors: Puriuškis Gintaras
Published: January 2024

There is not abstract.
Artificial intelligence challenges to education
Authors: Baskas Antanas
Published: January 2024

Paper discusses challenges to education called out by Educational delivery, Course manage­ment, Learning management and Authoring intelligence tutoring systems.Educational delivery systems – a software product or suite that facilitates the delivery of content or interaction by the web. Course management systems (CMS) – a software product that generally incorporates an educational delivery system for a topic (typically called a ``Course'' in educational institutions and most often facilitated via asynchronous-based formats) and provides integrated tools for measuring outcomes and reporting progress for individual or groups of students. CMS systems are currently most popular for educational institutions that are inclined to think of on-line development as course-centric.Learning management systems (LMS) – a software product that provides learners an integrated view of all their active coursework and assignments in a ``syllabus'' that spans multiple courses. LMS systems are most often found in large corporate training departments and corporate universi­ties.Intelligent management systems art computer-based instructional systems with models of inst­ructional content that specify what to teach, and teaching strategies that specify how to teach.
Methodological reasoning of the computer literacy standard for students
Authors: Dagienė Valentina
Published: January 2024

This paper discusses the computer literacy standard of students with respect to the European Computer Driving License (ECDL) and general informatics curricula of comprehensive schools. Some aspects of relations to ECDL Start modules are analyzed. The main attention is paid to discuss the virtue attitude of using the information and communication technology as well as to general capabilities related to computer literacy. The main propositions are presented and motivated. The paper also deals with the main fields of computer literacy topics: Basic principles and concepts of applying computers (1), Basics of information processing (2), Text handling and information presentation (3), Web and electronic mail (4), Introducing spreadsheet and data base (5), Social, juridical and ethical aspects (6).
Problems on the computer literacy of educators
Authors: Dagienė Valentina
Published: January 2024

This paper deals with the main problem of involving information technologies in education – contents of teachers' training courses. Three directions are presented: preparation of teachers (1), in-service teacher training (2), re-qualification of the speciality (3). The main attention should be paid to the constant in-service teachers' training. The Standard of computer literacy for educators has been developed. It should be the main sources of all teachers' training courses on informa­tion technology. The Standard consists of two parts: technological one and educational one. The technological part is based on ECDL Start modules. The educational part is uniqu: it requires some psychological, social, and pedagogical knowledge referring to information technology usage in education. The main attention of the paper is paid to the analysis and requirements of the educa­tional part of the Standard of computer literacy for educators.
Visualization of multidimensional data taking into account the learning flow of the self organizing neural network
Authors: Dzemyda Gintautas , Kurasova Olga
Published: January 2024

In the paper we discuss the visualization of multidimensional vectors taking into account the learning flow of the self organizing neural network. A new algorithm realizing a combination of the self-organizing map (SOM) and Sammon's mapping has been proposed. It takes into account the intermediate learning results of the SOM. The experiments showed that the algorithm gives lower average projection errors compared with a consequent application of the SOM and Sammon's mapping.
Interdisciplinary relations in teaching computer technologies in gymnasium
Authors: Kaklauskas Liudvikas , Kaklauskienė Danutė
Published: January 2024

In the article discuss about teaching of computers technology in the secondary school. Analysis relationships between this thing and others disciplines which is teaching. Look for best methods to use in investigation of this course.
The mathematical learning by Mathcad software use
Authors: Petraitienė Stasė , Bikulčienė Liepa , Kravčenkienė Violeta
Published: January 2024

The usidge of special mathematical software are impossible without mathematical knowledge, because they use functions which is common in everyday use. The MathConnex convert data from Excel, Matlab to MathCad and other way.
Models of idealized films and optimal networks relations between the problems and simulation results
Authors: Šaltenis Vydūnas
Published: January 2024

Simulation of idealized films under complex constraints is an instrument of investigating length-minimizing curves. If we select the proper evolution of the curves, their shapes may appro­ach to the solution of some combinatorial problems. The simulation of wet films was used in algorithms and software for solving the Steiner prob­lem. The results of the computational experiments are presented.
Deriving active database triggers from business rules model with conceptual graphs
Authors: Valatkaitė Irma , Vasilecas Olegas
Published: January 2024

ECA rules implemented into database management systems (DBMS) as triggers have proven to be powerful and effective mechanisms to enforce business rules in applications. Collection of all business rules implemented in united repository of specific DBMS reduces efforts of implemen­tation and maintenance, so does uniform domain conceptual model. Several conceptual modelling languages might be used but we propose to use conceptual graphs (CGs) because CGs offer const­ructs for modelling all static and dynamic aspects of application domain in a uniform way, and have both, a standard representation, and a graphical notation. In this paper we propose a generic algo­rithm to generate database triggers from domain model represented by CGs. The algorithm uses Conceptual Graphs Interchange Format (CGIF) representation. Such usage of CGs for business rules modelling is advocated.
The optimization of temperature regime in diode-pumped solid-state laser when applying cooling by water
Authors: Dabulytė Jurgita , Ivanauskas Feliksas
Published: January 2024

There is not abstract.
Algebraic data parallelism implementation in HPF
Authors: Judickaitė Valdona , Kulvietienė Regina , Kulvietis Genadijus
Published: January 2024

There is not abstract.
Computer modeling of solutions to stochastic differential equations: weak approximations
Authors: Lenkšas Antanas
Published: January 2024

There is not abstract.
The numerical models of the estimation of the electrooptical parameters of GaAs
Authors: Pincevičius Albertas , Rakauskas Rimantas-Jonas , Vošterienė Svajonė
Published: January 2024

In this paper we offer method for estimation of the relaxation of a photoconductivity of high resistivity crystal, stimulate by laser impulse. The system of the six nonlinear ordinary differen­tial equations is solved. The relaxation of electrons across four most influential deep levels is ta­ken into account. Electron concentration changes on fifteen orders in a narrow boundary layer (0–5 × 10-8 s). In the sequent layers change of the electrons concentration is slower in the time interval up to 10-4 second. The system of the differential equations was solved by a method Gear with a modification of a step. The electro-optical parameters of the crystal we found out by the com­parison of calculation and experiment outcomes. From the other side it is possible to use calculation for improvement of the characteristics of the devices.
Mathematicians in pre-war national defense forces of Lithuania
Authors: Ažubalis Algirdas
Published: January 2024

The article presents condensed biographical data and activity analysis on the 15 Lithuanian mathematicians who served in pre-war National Defense Forces of Lithuania, with the special emphasis on their contribution to strengthening national defense potential of the country.
Competition in mathematics as a form of educating gifted children: Kaunas case study
Authors: Dabrišienė Vilija , Narkevičienė Bronė
Published: January 2024

The goal of this article is to disclose peculiarities of pedagogue's activities while preparing gifted students to participate in mathematical competitions and contests. The article presents the analysis of the situation in Kaunas. The given results are related to the research of the pedagogue attitudes towards educating gifted children, the pedagogue's teaching ways and methods and the dependence of the achievement of the participators of mathematical competitions on the type of school.The data of the research shows that the pedagogue attitudes are not favourable enough towards individualized education of giftted children. The individualization of giftted children in the se­condary school is incomplete, the diversity in the modes of teaching activities is scarce and used episodically, this work is not planned, and it is not organized systematically. It is necessary to stimulate this activity of pedagogues and implement the system of motivation.
Об иррациональности значений тригонометрических функций
Authors: Mačys Juozas
Published: January 2024

There is not abstract.
Application of information technologies in teaching of mathematics in Vilnius College in higher education
Authors: Saldauskienė Jovita , Virkutis Vytautas
Published: January 2024

This work contains the material about forms and methods of teaching of mathematics. It con­tains clear description of the aims, terms, techniques and methods of teaching. The research was made. The analysis of students' questionnaire datum was made.There were made the following conclusions:

Mathematics teaching module in college in higher education is expedient to use emphasizing on practically applied subject.

Mathematics computer programs are recommended as a more effective teaching method.
Correlation analysis of marks for mathematics and prognosis of results of examinations
Authors: Raulynaitis Juozas , Krylovas Aleksandras
Published: January 2024

In this article a correlational analysis of different marks for mathematicas of those who whe admitted to the Faculty of Construction of the Vilnius Gediminas Technical University in 2001 is carried out.
Structural rules and cut admissibility in a sequent calculus of temporal logic with predicates = and >
Authors: Alonderis Romas
Published: January 2024

There is not abstract.
About the possibility of the extension of the additive arithmetic
Authors: Maliaukienė Livija
Published: January 2024

In this paper the sequential variant of the additive arithmetic with equality and the non-logical symbols o, t, P, + , = is investigated and the proovable properties of the additional function nit is ascertained.
Decision procedure for first-order linear temporal logic with semi-periodic kemels
Authors: Pliuškevičius Regimantas
Published: January 2024

There is not abstract.
Separable spatio-temporal covariance functions
Authors: Dučinskas Kęstutis , Lesauskienė Edita
Published: January 2024

Ther is not abstract.
Comparison of confidence interval construction methods for discrete biological data
Authors: Kanopaitė Alesia , Mickevičius Eduardas , Radavičius Marijus
Published: January 2024

The bootstrap (resampling) methods of construction of confidence intervals (c.i.) are conside­red. The c.i. obtained are compared with each other and with the standard student c.i. by simula­tion. The study is based on a real biological data about distribution of badger, fox, and raccoon dog borrow number in 1 km2 square areas uniformly allocated throughout Lithuania territory. The dist­ributions take only a few nonzero values with relatively large proportion of zeros, are very skewed and have irregular tails. In this case the normal approximation, the student c.i. is based on, of the distribution of the sample mean is not sufficiently accurate for small samples.
Projection-based estimation of multivariate distribution density
Authors: Kavaliauskas Mindaugas , Rudzkis Rimantas
Published: January 2024

There is not abstract.
One parametric fertility model
Authors: Lapinskas Remigijus , Verikaitė Ramunė
Published: January 2024

There is not abstract.
On uniform error of kemel estimate of discontinuous regression function
Authors: Račkauskas Alfredas , Tamulis Aurelijus
Published: January 2024

There is not abstract.
Discriminant analysis of spatial-temporal data
Authors: Šaltytė-Benth Jūratė , Dučinskas Kęstutis
Published: January 2024

There is not abstract.
On the numerical solving of one minimization problem
Authors: Čiegis Raimondas , Pakenienė Violeta
Published: January 2024

In this paper we consider the dependence of iterative methods convergence rate on iterative parameters selection. We propose the numerical algorithm determination of the optimal iterative parameters. Using it we solve classical minimization 2D and 3D problems and modificate 2D and 3D minimization problems and analyse the convergence rate dependence on the matrix spectral characteristics.
Mathematical model of evaluating dissipated pollution and its numerical realization
Authors: Kleiza Vytautas , Sakalauskienė Gaudenta
Published: January 2024

The paper considers pollution spreading models, based on turbulent diffusion equation, as well as their numerical realization using particular data of rivers in Lithuania.
Determination of the Dirichlet condition in an electrodynamic problem describing the anyzotropically conductive medium
Authors: Kleiza Vytautas , Sėrikovienė Silvija
Published: January 2024

The paper deals with the problem of potential determination on a plain domain, using the con­formal mapping theory.
Long-term stability of cylindrical shells of viscoelastic composites
Authors: Sirius Vaclovas
Published: January 2024

On the grounds of Hamilton's principle the system of linear integral equations has been ob­tained for the solution of stability problems of cylindrical shells made of viscoelastic composite materials by the finite element method.
Application of the dynamical damper in a piecewise linear system
Authors: Zaksienė Genovaitė
Published: January 2024

The linear dynamical damper of nonlinear system functions better than in linear system. It can compensate excitation in the wild diapason of frequency.
On approximation by the Poisson law
Authors: Čekanavičius Vydas
Published: January 2024

There is not abstract.
Asymptotic expansion for the distribution function of the series scheme of random variables in the large deviation Cramer zone
Authors: Deltuvienė Dovilė
Published: January 2024

There is not abstract.
Discrete limit theorems for general Dirichlet polynomials
Authors: Macaitienė Renata
Published: January 2024

There is not abstract.
Physical activity and sedentary behaviors and the impact on college student’s stress, depression, and anxiety
Authors: S Geller Karly , M Capito Angelo , T Marsh Zachary
Published: January 2024

University students are at a significant risk for mental health issues, including stress and depression. Negative mental health among college-aged adults continues to rise, impacting students’ cognitive function, academic performance, social development, and overall well-being. Rather than offering support through medication, physical activity has demonstrated a potential behavioral approach to reduce students’ stress and anxiety. The current study examined the influence of young adults’ physical activity and sedentary behavior levels and their self-reported stress, depression, and psychological well-being. Participants were undergraduate and graduate students recruited from a Midwestern university and a Mid-Southern university. Multiple linear regressions estimated mean differences in participants’ self-reported stress, depression, and psychological well-being based on their physical activity levels and sitting minutes. Moderate levels of physical activity improved participants’ growth psychological well-being (p = .01). Vigorous physical activity had an effect on participants’ relations, purpose, and self-acceptance (p<0.05). Daily sitting minutes significantly affected participants’ stress, perceived stress, depression, and environmental psychological wellness (p<0.05). Results demonstrate how physical activity can be a natural medicine for symptoms of stress and depression. Current outcomes support the development of future programs to prevent and react to mental health via physical activity.
Malay Apple (Syzygium malaccense) Fruit Calendar: A Case in Central Java
Authors: Widodo Pudji , Proklamasiningsih Elly
Published: January 2024

AbstractMalay apple (Syzygium malaccense) is a kind of popular fruit tree originally from Indo-Malayan-Region or South East Asia. There are many environmental factors affecting the flowering time, infrutescence number, fruit size, and fruit number, such as fruit position on the spur, spur size, fruit number set on the spur, and the date of flowering. The objectives of this study were to find out the fruit production during dry and wet seasons, so that fruit calendar can be determined.  The method used in this study was survey and observation on Malay apple trees in Banyumas, Purbalingga, and Kebumen from 2018 to 2021. The results of this study showed that June, July, and August when the precipitation was the lowest, the fruit number is the highest, and fruit size is the smallest (145–175 mL). On the other hand, when the precipitation was high (September-April), the fruit was the largest (180–500 mL).  Fruit harvest time might change every year depending on climatic factors such as average daily temperature and precipitation. There is no specific harvest time for Malay apples. The implementation of the results of this research is that we do not need to predict when the Malay apple harvest season will be, because the harvest time can be at any time.AbstrakJambu bol (Syzygium malaccense) merupakan salah satu jenis pohon buah-buahan populer yang berasal dari Wilayah Indo-Malayan atau Asia Tenggara. Banyak faktor lingkungan yang memengaruhi waktu berbunga, jumlah bunga, ukuran buah, dan jumlah buah, seperti posisi buah pada tajuk, ukuran tajuk, jumlah buah tiap dompol, dan tanggal berbunga. Penelitian ini bertujuan untuk mengetahui produksi buah pada musim kemarau dan musim hujan, sehingga dapat ditentukan kalender buah. Metode yang digunakan dalam penelitian ini adalah survei dan observasi pada pohon jambu bol di Banyumas, Purbalingga, dan Kebumen dari tahun 2018 sampai dengan tahun 2021. Hasil penelitian ini menunjukkan bahwa pada bulan Juni, Juli, dan Agustus curah hujan paling rendah, jumlah buahnya paling tinggi, dan ukuran atau volume buahnya relatif  paling kecil (145–175 mL). Sebaliknya, ketika curah hujan rata-rata tinggi (September-April), buahnya berukuran besar, dengan volume 180–500 mL. Waktu panen buah dapat berubah setiap tahun tergantung pada faktor iklim seperti suhu harian rata-rata dan curah hujan. Hasil penelitian ini menunjukkan bahwa tidak ada waktu yang spesifik untuk waktu panen jambu bol. Implementasi dari hasil penelitian ini adalah bahwa kita tidak perlu memprediksi kapan musim panen jambu bol, karena waktu panen bisa kapan saja.
Potensi Isolat Bakteri Selulolitik Toleran Panas Asal Tanah, Sampah Dapur, dan Kotoran Sapi Dalam Biodegradasi Serasah Daun
Authors: Satwika Taruna Dwi , Pramono Hendro , Yulianti Dwiana Muflihah
Published: January 2024

AbstrakBakteri selulolitik memainkan peranan penting dalam biodegradasi komponen selulosa pada sampah organik. Namun, proses pengomposan umumnya melewati fase termofilik (suhu mencapai 55 °C), sehingga tidak semua bakteri dapat bertahan. Sebanyak delapan isolat bakteri selulolitik telah berhasil diisolasi dari tanah, sampah dapur, dan kotoran sapi. Namun, isolat-isolat tersebut belum diketahui aktivitas selulolitiknya pada suhu tinggi dan kemampuannya dalam mendegradasi biomassa serasah daun. Tujuan penelitian ini adalah mengetahui aktivitas selulolitik isolat bakteri pada suhu tinggi secara kualitatif, mengetahui aktivitas selulolitik isolat bakteri secara kuantitatif, dan mengetahui kemampuan isolat bakteri selulolitik dalam mendegradasi biomassa serasah daun. Penelitian dilakukan dengan tahapan peremajaan isolat, skrining kualitatif aktivitas selulolitik isolat pada suhu ruangan, 45 °C dan 55 °C, skrining kuantitatif aktivitas selulolitik isolat, dan uji degradasi biomassa serasah daun. Sebanyak 6 dari 8 isolat bakteri menunjukkan aktivitas selulolitik pada medium Carboxy Methyl Celullose (CMC) Agar pada suhu 55 °C. Berdasarkan uji aktivitas enzim secara kuantitatif, 3 isolat (KS1, KS4, dan SD5) dengan aktivitas enzim tertinggi terpilih untuk pengujian degradasi serasah daun dan menunjukkan rata-rata aktivitas enzim secara berurutan 0,0074 UI/mL; 0,0080 UI/mL; 0,0159 UI/mL. Ketiga isolat mampu mempercepat proses degradasi serasah daun dan berpotensi sebagai agen pengomposan.AbstractHowever, the composting process generally passes through a thermophilic phase (55 °C), so that not all bacteria can survive. A total of 8 isolates of cellulolytic bacteria isolated from soil, kitchen waste, and cow dung have not yet known their cellulolytic activity at high temperatures and their ability to degrade leaf litter biomass. This study aimed to determine the cellulolytic activity of bacterial isolates at high temperatures qualitatively, to determine the cellulolytic activity of bacterial isolates quantitatively, and to determine the ability of these isolates to degrade leaf litter biomass. The research was carried out by reculture isolates; qualitative screening of isolate cellulolytic activity at room temperature, 45 °C and 55 °C; quantitative screening of isolate cellulolytic activity; and leaf litter biomass degradation test. Six of eight bacterial isolates showed cellulolytic activity on Carboxy Methyl Celullose (CMC) Agar medium at 55 °C. Three isolates (KS1, KS4, and SD5) with the highest enzyme activity were selected for the leaf litter degradation test and showed an average enzyme activity of 0.0074 UI/mL; 0.0080 UI/mL; 0.0159 UI/mL, respectively. The three isolates were able to accelerate the degradation process of leaf litter and have potential as composting agents.
Analisis Ekspresi Gen MmCu/Zn-SOD dan Ketahanan Tanaman Kentang Kultivar IPB CP3 Transgenik Terhadap Cekaman Herbisida Parakuat
Authors: Velayati Muhammad Akbar , Suharsono Suharsono , Miftahudin Miftahudin
Published: January 2024

AbstrakPenggunaan herbisida parakuat untuk mengendalikan pertumbuhan gulma telah menjadi metode yang paling umum. Namun, penggunaan herbisida juga dapat menyebabkan kematian sel tanaman kentang yang sedang dibudidayakan, karena herbisida parakuat dapat menginduksi pembentukan senyawa Reactive Oxygen Species (ROS) yang dapat merusak sel tanaman. Ekspresi berlebih dari gen MmCu/Zn-SOD diharapkan dapat memberikan ketahanan tanaman terhadap cekaman herbisida parakuat. Penelitian ini bertujuan untuk menganalisis ekspresi gen MmCu/Zn-SOD pada kentang transgenik IPB CP3 kultivar dan ketahanannya terhadap cekaman herbisida parakuat. Perlakuan herbisida parakuat dengan konsentrasi 75 µM pada tanaman transgenik (P3SOD6, P3SOD9, P3SOD17) dan non-transgenik (NT) secara in vitro menunjukkan bahwa semua tanaman transgenik lebih tahan terhadap cekaman parakuat dibandingkan tanaman non-transgenik. Klon P3SOD9 paling tahan terhadap herbisida parakuat, dengan perbandingan 10 tanaman hidup dari 12 tanaman yang diuji. Ekspresi gen MmCu/Zn-SOD pada galur transgenik lebih tinggi dibandingkan galur non-transgenik. Ekspresi relatif gen MmCu/Zn-SOD pada P3SOD9, P3SOD6, dan P3SOD17 secara berturut-turut lebih tinggi 233,22; 127,62; dan 3,18 kali dibandingkan ekspresi gen tersebut pada NT. Semakin tinggi ekspresi gen MmCu/ZnSOD, semakin tinggi ketahanan terhadap cekaman herbisida parakuat.AbstractThe use of paraquat herbicide to control weed growth has become the most common method. However, using the herbicide can also cause cell death in potato plants that are being cultivated because it can induce the formation of Reactive Oxygen Species (ROS) compounds that can damage plant cells. Overexpression of the MmCu/Zn-SOD gene is expected to provide resistance to paraquat herbicide stress. The study aimed to analyze the expression of the MmCu/Zn-SOD gene in transgenic potato cultivar IPB CP3 and its resistance to paraquat herbicide stress. In vitro treatment of transgenic (P3SOD6, P3SOD9, P3SOD17) and non-transgenic (NT) potato with 75 µM paraquat herbicide showed that all transgenic plants were more resistant to paraquat stress than that non-transgenic plants. The P3SOD9 clone was the most resistant to paraquat herbicide, with a ratio of 10 surviving plants of the 12 tested plants. The expression of MmCu/Zn-SOD in transgenic lines was higher than that in non-transgenic lines. The relative expressions of MmCu/Zn-SOD gene in P3SOD9, P3SOD6, and P3SOD17 were 233.22; 127.62; and 3.18 times higher than that of NT, respectively. The expression level of MmCu/ZnSOD correlates with the level of resistance to paraquat herbicide stress.
Diet, Feed Preferences, and Nutritional Intake of Hylobates albibarbis in Transit Cage BKSDA Kalimantan Tengah
Authors: Darniwa Adisty Virakawugi , Kinasih Ida , Fitri Nurul Aulia
Published: January 2024

AbstractHylobates albibarbis is a type of small primate that lives on the island of Borneo with a characteristic black face and white hair on the eyebrows, cheeks, and chin that resembles a beard. H. albibarbis feeding management is important in conservation efforts on ex-situ conservation because of animal welfare. This study aims to determine the composition of the diet, feed preferences and nutritional intake of feed given to H. albibarbis in transit cage at the Palangka Raya-Central Kalimantan Office for Conservation of Natural Resources (named Balai Konservasi Sumber Daya Alam-BKSDA) under the Directorate of Conservation of Natural Resources and Ecosystems of the Ministry of Environment & Forestry of the Republic of Indonesia. The methods used are focal animal sampling and restricted feeding observed in individual male adult and infant of H. albibarbis. The observations show that the feed preferred by adult H. albibarbis was the Ambon banana (98.21%) and the least preferred was the Kepok banana (74.26%). Otherwise, in infants H. albibarbis the most preferred feed was papaya (93.43%), and the least preferred feed was Ambon banana (58.10%). The average daily feed intake for adult H. albibarbis was 658.52 g, and for infant was 378.16 g. H. albibarbis in transit cage at the Palangka Raya BKSDA office, Central Kalimantan had good growth and healthy physical condition assumed from their body weight and length.AbstrakHylobates albibarbis merupakan kera kecil yang hidup di Pulau Kalimantan dengan ciri khas wajah berwarna hitam dan rambut berwarna putih pada alis, pipi, dan dagu yang menyerupai janggut. Pengelolaan pakan H. albibarbis penting dalam upaya konservasi dengan konservasi ex-situ untuk kesejahteraan hewan. Penelitian ini bertujuan untuk mengetahui komposisi pakan, preferensi pakan, dan asupan nutrisi pakan yang diberikan pada H. albibarbis di kandang transit kantor BKSDA Palangka Raya Kalimantan Tengah. Metode yang digunakan adalah focal animal sampling dan restricted feeding pada individu jantan dewasa dan jantan bayi H. albibarbis. Observasi dilakukan dalam durasi 12 jam selama 31 hari. Hasil pengamatan menunjukkan bahwa pakan yang disukai H. albibarbis dewasa adalah pisang Ambon (98,21%) dan yang tidak disukai adalah pisang Kepok (74,26%). Pakan yang disukai bayi H. albibarbis adalah pepaya (93,43%) dan yang tidak disukai adalah pisang Ambon (58,10%). Total asupan pakan harian untuk H. albibarbis dewasa adalah 658,52 g. Total asupan pakan harian untuk H. albibarbis bayi adalah 378,16 g. H. albibarbis di kandang transit kantor BKSDA Palangka Raya Kalimantan Tengah memiliki pertumbuhan yang baik dan kondisi fisik yang sehat berdasarkan berat badan dan panjang tubuhnya.