bluuebunny/crossref_metadata_2025 huggingface dataset:
Factores de riesgo asociados a ruptura prematura de membranas en gestantes de 24 a 34 semanas atendidas en el Hospital Jose Agurto Tello de Chosica, Lima 2020
Authors:   , Ventocilla Zapata Jennyfer Ruth
Published: August 2023

Objetivo: Determinar los factores de riesgo asociados a la ruptura prematura de membranas en gestantes 24 a 34 semanas atendidas en el Hospital José Agurto Tello de Chosica, Lima 2020. Materiales y métodos: Se realizó un estudio descriptivo, analítico de casos y controles, retrospectivo y la muestra estuvo conformada por 162 gestantes; el muestreo fue de tipo aleatorio simple. Se utilizó como instrumento una ficha de recolección de datos y para el análisis estadístico se determinó las frecuencias de las características demográficas, además se calculó el Odss ratio para determinar los factores de riesgo asociados a la ruptura prematura de membranas. Resultados: La edad promedio de las gestantes fue de 26 años y la mayoría tenía grado de instrucción secundaria (67,9%). Los factores de riesgo más relevantes que estaban asociados a la ruptura prematura de membranas fueron las infecciones cérvico-vaginales (OR = 1,94; IC95%: 1,03-3,65) y las hemorragias antes del parto (OR: 2, 67; IC95%: 1,21-5,93); los demás factores no demostraron significancia estadística para ser considerados factores de riesgo. Conclusiones: Los principales factores de riesgo para desarrollar una ruptura prematura de membrana fueron las infecciones cérvico-vaginales y las hemorragias antes del parto.
Factores asociados a depresión del personal de enfermeria del servicio de emergencia COVID del Hospital Nacional Alberto Sabogal Sologuren durante el primer trimestre del 2021
Authors:   , Ariadela Sanchez Julio Alfredo
Published: August 2023

Objetivo: Determinar el factor predominante asociado a depresión del personal de enfermería del servicio de emergencia COVID del Hospital Nacional Alberto Sabogal Sologuren durante el primer trimestre del 2021. Metodología: El tipo de estudio fue observacional, retrospectivo, de nivel correlacional y de corte transversal. La población del estudio constituida por 217 personal de enfermería cumpliéndose los criterios de inclusión y exclusión, siendo una muestra censal como instrumento se aplicó cuestionarios, los cuales fueron sometidos a la validez del contenido por juicio de expertos. Resultados: Se obtuvo en el trabajo un kolmogrow smirrow = 0,000, por lo que se usó chi2 mostrando una correlación positiva en 4 factores (p=<0,05) mostrando una fuerte asociación el factor familiar con COVID (PhiVCramer= 0.794), siendo este el más predominante (Sig.= 0.000, Wald de 46,687). Conclusión: Hay asociación entre la depresión y la edad, género y número de trabajos, sobre todo el tener familiar con COVID, por lo que se recomienda tenerlo presente en futuros trabajos de investigación.
Trastornos musculoesqueléticos y teletrabajo en épocas de COVID-19: frecuencia y factores asociados en el personal del centro de administración de servicios educativos FAP 2021
Authors:   , Chafloque Deudor Selene Del Carmen
Published: August 2023

Objetivo: Determinar la frecuencia de trastornos musculoesqueléticos según factores sociodemográficos en el personal del Centro de Administración de Servicios Educativos FAP 2021. Materiales y métodos: la investigación fue observacional, retrospectivo, transversal, nivel relacional, en una población de 72 individuos. Resultados: se encontró una mayor frecuencia de trastornos musculoesqueléticos en la muñeca/mano (66,7%) y estuvieron asociados (p<0,05) a la edad de 36 a 55 años y al personal que tenía más de 5 años de labor. En relación a la intensidad de sintomatología del dolor, en su mayoría se encontró nivel moderado en el cuello, hombros, columna, codo/antebrazo, donde se presentó sintomatología leve fue en la mano/muñeca. De igual forma se encontró, según el tiempo de desarrollo de la enfermedad, en el cuello, hombro, codo/antebrazo, muñeca/mano una sintomatología presente en los últimos 12 meses; en el caso de la columna estos síntomas se presentaron en los últimos 7 días. Se puede concluir que la región corporal que tuvo mayor frecuencia de molestias fue la mano/muñeca, con desarrollo de enfermedad de los últimos 12 meses y un nivel moderado de intensidad de dolor.
Complicaciones obstétricas intraparto en relación al numero de control prenatal en gestantes atendidas en el centro de salud materno infantil Santa Anita en tiempos de pandemia, abril 2020 - marzo 2021
Authors:   , Córdova Quispe Rocío Del Pilar
Published: August 2023

OBJETIVO. Determinar la relación entre las complicaciones obstétricas intraparto y el número de control prenatal en gestantes atendidas en el Centro de Salud Materno Infantil Santa Anita en tiempos de pandemia, abril 2020 - marzo 2021. MATERIAL Y METODO: La presente investigación es un estudio de enfoque cuantitativo, de tipo descriptivo – correlacional, de diseño No experimental, de corte Transversal. Aplicando los criterios de inclusión y de exclusión se obtuvo una población de 797 gestantes se aplicó el muestreo probabilístico para la determinación de la muestra, se aplicó la fórmula de poblaciones finitas y se obtuvo una muestra de 260 participantes. El instrumento utilizado fue una Ficha de Recolección de Datos que fue validado por los Expertos. El programa utilizado para el análisis fue el SPSS versión 26 y la prueba no paramétrica de Chi Cuadrada. RESULTADOS. El análisis inferencial de las variables dio como resultado que existe una relación entre el número de control prenatal y las complicaciones obstétricas intraparto hallando un valor de p = 0.000. Se encontró que de 260 gestantes solo 31.15% (81) realizaron un control prenatal igual y/o mayor a 6. También que el 56.9% (148) sufrió una complicación Obstétrica intraparto; el Desgarro vaginal alcanzo el 98.6% (146) de ocurrencia entre las todas las complicaciones, se halló que el 80% (200) tenía la edad entre los 19 y 35 años, el 98.5% (256) es de procedencia urbana y el 96.9% (252) es ama de casa. Con respecto a los antecedentes gineco obstétricos el 40.4% (105) eran multigestas, el 60.4% (157) habían tenido un parto previo y el 24.6% sufrió un aborto previo. CONCLUSIONES: Se rechaza la hipótesis nula y se acepta la hipótesis de la investigación que afirma la relación entre Las complicaciones obstétricas intraparto y el número de control prenatal.
Nivel de conocimientos y actitudes sobre anticoncepción oral de emergencia en egresados de medicina humana, de la Universidad Privada San Juan Bautista, Lima 2021
Authors:   , Huacachi Dolorier Christel
Published: August 2023

Objetivos: Determinar el nivel de conocimientos y actitudes sobre anticoncepción oral de emergencia en egresados de medicina humana, de la Universidad Privada San Juan Bautista, Lima 2021. Materiales y métodos: El estudio fue realizado en egresados de medicina humana de la Universidad Privada San Juan Bautista de la sede Lima, entre los meses de mayo a julio del 2021; la investigación fue de tipo observacional, descriptiva, prospectiva y transversal. Su nivel de investigación es descriptivo, se tomó como muestra a 129 egresados y se usó como instrumento una encuesta ya validada. Los datos fueron extrapolados a Excel y posteriormente a la base de datos SPSS versión 26. En todos los análisis las variables categóricas fueron resumidas mediante frecuencias y porcentajes. Resultados: Del 100% (129) de egresados de medicina de la UPSJB se obtuvo que 69,8% (90) fueron mujeres y 30,2% (39) fueron varones, encontrándose un predominio femenino; en relación a las edades, se encontraron egresados menores de 30 y > o igual a 30 años ,se encontró un predominio de 25 años (22,5%); con respecto al nivel de conocimiento, se obtuvo que 17,1% de egresados tienen un nivel alto de conocimiento, 51,9% tenían un nivel medio de conocimientos y 31,0 % tenían un nivel bajo de conocimientos; en relación a la actitud, se obtuvo que el 9,3% (12) de egresados presentaron una actitud de rechazo, el 51,2% (66) presentaron una actitud de indecisión y el 39,5% (51) presentaron una actitud de aceptación frente al AOE. Conclusiones: La mitad de los egresados de medicina de la UPSJB que fueron encuestados, presentaron un nivel de conocimiento medio. Respecto a la actitud, hubo indecisión frente al tema de anticoncepción oral de emergencia.
Factores de riesgo neonatales asociados a ictericia en el servicio de neonatología del Hospital San José – Callao: 2021
Authors:   , Redhead Guillén Orlando Gabriel
Published: August 2023

INTRODUCCIÓN: La ictericia neonatal es una patología que se manifiesta a través de la piel o las escleras por medio de una pigmentación amarillenta, debido al aumento de las bilirrubinas por encima de 5 mg/dl, que no se absorben correctamente en el organismo. Esta ictericia puede estar desencadenada por diversas causas que van desde una ictericia fisiológica que tiene resolución con el pasar de los días, hasta una ictericia debido a incompatibilidades de grupo sanguíneo. OBJETIVO: Determinar la asociación de los factores neonatales con la ictericia en los recién nacidos. MATERIALES Y METODOS: este estudio es de tipo observacional, retrospectivo, transversal y analítico tipo casos y controles. La población estuvo conformada por 318 pacientes de la unidad neonatal del hospital San José-Callao, en donde 67 fueron casos y 251 controles cumpliendo con los criterios de inclusión y exclusión previstos. De igual forma con la medición de las variables de estudio se aplico como instrumento de investigación una encuesta y ficha de recolección de datos. RESULTADOS: en este estudio pudimos encontrar que la prematuridad con un valor de chi cuadrado de 0.793, OR:0.896, IC95% (0.393-2.042), no guardo relación con la ictericia, a diferencia de la incompatibilidad ABO donde se observó un valor de chi cuadrado de 0.000, OR: 6,122 y IC 95% (4,739-7,910) estableciendo una elevada relación con la ictericia, por otro lado la lactancia materna no pudo medirse su asociación ya que a ningún recién nacido se le restringió la lactancia materna, por su parte la sepsis neonatal mostro una asociación significativa con un valor de chi cuadrado de 0.024, OR: 0.537. IC 95% (0.312-0.925). CONCLUSIONES: Dentro de los factores de riesgo neonatales los que influyeron de manera significativa en la aparición de la ictericia a fueron la incompatibilidad de grupo sanguíneo ABO y la sepsis neonatal en los recién nacidos del hospital San José-Callao.
Variación de la agudeza visual pre y post cirugía de catarata por técnica quirúrgica mininuc en pacientes mayores de 40 años del Hospital San Juan de Lurigancho. Lima, 2019
Authors:   , Changa Lima Alexandra Eloa
Published: August 2023

Objetivo. Comprobar la variación de la agudeza visual pre y post cirugía de catarata por técnica Mininuc en pacientes mayores de 40 años el Hospital San Juan de Lurigancho durante los meses de julio a diciembre del año 2019 Lima Metodología. El trabajo de investigación presentado es no experimental, tiene una pauta descriptiva, observacional, en tiempo retrospectivo y trasversal sobre una población de 323 pacientes del servicio de oftalmología de dicho nosocomio, donde se tomó un tamaño muestral de 179 pacientes sometidos a cirugía de cataratas de julio a diciembre en el año 2019 Resultados. Encontramos una agudeza visual pre cirugía de 0.11 y una post cirugía de 0,73, que es altamente significativa en relación a la medida anterior, estos valores de medición tienen una desviación típica de 0,09 a 0,34 y un error típico de la media que pasa de 0,007 a un 0,026 pre y post cirugía respectivamente. Conclusiones. La variación de la agudeza visual pre y post cirugía de catarata en los pacientes operados por técnica quirúrgica Mininuc del servicio de Oftalmología del Hospital San Juan de Lurigancho, va de una agudeza visual de 0.11 pre cirugía (20/200) a una agudeza visual de 0.73 (20/20) post cirugía, teniendo en estos pacientes una discapacidad severa pre cirugía que predomina en el 76% y un estado de agudeza visual excelente post cirugía en un 49.1%, teniendo con frecuencia pacientes de 70 – 79 años de edad en un 36,6%, de sexo femenino 56,6% donde el ojo derecho es el más operado representando un 51,4%.
Quality Analysis Of Cream Scrub Combination of Moringa (Moringa oleifera) Leaf Extract and White Glutinous Rice (Oryza sativa glutinosa) Starch
Authors: Jamilatun Makhabbah , Rahmadianty Harmayanti Aidha , Lukito Pradea Indah
Published: August 2023

Premature aging is a health problem that attacks facial skin and is very disturbing appearance. This can be overcome of them with antioxidant compounds. Sources of natural antioxidant compounds in Indonesia are found in Moringa leaves and white glutinous rice. The use of antioxidants is facilitated by making them into cosmetic preparations, one of which is scrub cream. This study aims to determine the physical quality and antioxidant activity of a cream scrub combined with Moringa leaf extract and glutinous rice starch. This research begins with the extraction of moringa leaves and white glutinous rice starch. Moringa leaf extract and white glutinous rice starch obtained were then made into cream scrub preparations at 4 concentration variations, with a comparison of Moringa leaf extract and white glutinous rice starch F0 (0%:0%), F1 (25%:75%), F2 ( 50%:50%) and F3 (75%:25%). The quality test of the luxurious cream included an organoleptic test, pH test, spreadability test, adhesion test, and irritation test. An antioxidant activity test was carried out using the DPPH method. The results showed that the combination of Moringa Leaf Extract (Moringa oleifera) and White Glutinous Rice Starch can be formulated as a cream scrub, with the results of physical quality both organoleptic, pH, spreadability, adhesion, and irritation fulfilling the requirements, and antioxidant activity in the strong category at F3.
Report from the Extreme Ultraviolet (EUV) Lithography Working Group Meeting :
Authors: Rasmussen Elizabeth G , Wilthan Boris , Simonds Brian
Published: August 2023

This is the report of a hybrid working group meeting held on April 25, 2023, at the National Institute of Standards and Technology (NIST) in Boulder, CO. The working group was focused on extreme ultraviolet lithography (EUVL) research, development, and manufacturing. The meeting allowed for productive discussions on many technical aspects of EUVL. Industry participants gave presentations that helped inform this report's outline of the current state of the science, challenges, needs, and future opportunities for accelerated innovation in EUVL. The report also includes information on some of NIST's efforts that could begin or continue to support the USA semiconductor industry. Cohesively presenting some of NIST's research and capabilities at the working group meeting provided external stakeholders visibility and the opportunity to comment. The meeting was insightful for industry participants learning about NIST's research capabilities .In turn, NIST researchers gained a deeper understanding of the industry's needs to identify where NIST's metrology expertise could assist in EUVL research. The meeting and this report do not, and are not intended to, capture the entire perspective of the EUVL industry but rather serve as a discussion starting point. Future work includes expanding participation, honing NIST research sub-groups to specific needs of EUVL, and executing priority research discussed in the working group meeting or any future meetings. Through engagement with the USA EUVL industry, targeted research collaborations are hoped to be created, accelerating semiconductor manufacturing innovation and generating meaningful value for USA taxpayers.
Desenvolvimento de Materiais Didáticos para o Processo de Ensino de Matemática para Estudantes com Deficiência Visual
Authors: Uliana Marcia Rosa , Mól Gerson de Souza
Published: August 2023

O objetivo desse estudo é apresentar seis materiais didáticos desenvolvidos/adaptados por licenciandos em Matemática com potencial de serem utilizados no processo de ensino-aprendizagem da Matemática para estudantes do Ensino Médio com deficiência visual. Cabe elucidar que os materiais didáticos, apresentados e analisados neste estudo, foram desenvolvidos durante um curso de extensão que foi objeto de investigação e culminou em uma tese de doutorado. Trata-se de um estudo qualitativo em que são apresentados seis materiais didáticos desenvolvidos/adaptados para o processo de ensino-aprendizagem dos seguintes tópicos de conteúdos matemáticos do Ensino Médio para estudantes com deficiência visual: Função do Primeiro e Segundo Grau; Trigonometria; Geometria Plana; Geometria Espacial; Análise Combinatória; e, Matriz e Determinante. Ficou evidente que os licenciandos, quando sensibilizados e inteirados das demandas particulares dos estudantes com deficiência visual, conseguem planejar e desenvolver materiais didáticos de baixo custo e que atendem aos estudantes com deficiência visual no processo didático.
Análise das Pesquisas Brasileiras Stricto Sensu no período de 2000 a 2019 sobre História da Matemática e Formação de Professores Reflexivos
Authors: Guimarães Filho José dos Santos , Corrêa João Nazareno Pantoja , Brandemberg João Cláudio
Published: August 2023

Relacionar história da matemática na formação de professores não é uma postura nova, e esta vem se tornando uma alternativa possível e viável. Dessa forma, questionamos, quais contribuições da História da Matemática para formação de professores de Matemática reflexivos encontradas nas teses e dissertações defendidas no Brasil no período de 2000 a 2019? Assim, objetivamos investigar as implicações do uso da História da Matemática para a formação de professores de Matemática e identificar as posturas reflexivas que estes assumiram em teses e dissertações defendidas no Brasil no período de 2000 a 2019. Para tanto, adotamos uma pesquisa bibliográfica no Centro Brasileiro de Referência em Pesquisa sobre História da Matemática – CREPHIMat, no qual, foram selecionados 6 (seis) trabalhos, sendo 2 (duas) teses e 4 (quatro) dissertações. Após a análise foi possível verificar que a história da matemática na formação dos professores de Matemática, pode contribuir efetivamente para o processo de reflexão docente de sua prática, levando estes professores a se tornarem questionadores, investigadores, problematizadores e críticos de suas próprias ações.
Análisis crítico de la evolución de la contextualización del desarrollo local en Ecuador. Antecedentes y conceptos
Authors: Vargas Mursulí Flavia María , Esquivel García Renier
Published: August 2023

En el estudio se realizó una valoración a la evolución, el concepto y las dimensiones del desarrollo local, basado en un enfoque multidimensional. Se deja una base teórica conceptual vinculada a la contextualización que ha tenido en Ecuador el desarrollo local. El objetivo es analizar la evolución de la contextualización del desarrollo local y su efecto en el país. La revisión y análisis de las fuentes documentales permitió resumir las bases fundamentales que describen y justifican el concepto y evolución del desarrollo local. El resultado indica la factibilidad de un grupo de estrategias para orientar a los actores y profesionales sobre las acciones a seguir para dar sostenibilidad a los proyectos de desarrollo local. En la conclusión se manifiesta la necesidad de integrar las dimensiones del desarrollo local en un entorno donde el cambio es la constante y requiere de conocimientos para el logro de un desarrollo local sostenible
Aproximación a la resolución de problemas mediante un proceso heurístico o una simulación
Authors: Delgado Pineda Miguel
Published: August 2023

La Matemática e reconocida como un conocimientos cuyo aprendizaje requiere resolver problemas, pero el conocimiento matemático no sólo se produce vía inductiva y deductiva. Resolver un problema, requiere tener la certeza de que es resoluble, de ahí, que se tengan tantos resultados que sólo aseguran la existencia. No tener asegurada la existencia puede hacer que un problema sea un sueño imposible. Un acercamiento no inductivo-deductivo puede facilitar la predisposición personal sobre la búsqueda de solución de un problema. En este trabajo se tratan cuatro ejemplos relativos a distintos niveles educativos que son abordados experimentalmente siguiendo tres vías propuestas: La vía heurística, la vía simulada y la vía erudita. Dos problemas fueron objeto de estudio con dos muestras de profesores en activo y de estudiantes universitarios. La experiencia indica que es factible concatenar alguna de las dos primeras vías con la vía erudita para generar conocimiento matemático de una forma natural.
Inovasi Jasaku: Pengaruh Website Terhadap Kemudahan Perbaikan Rumah Oleh Tukang Dan Masyarakat
Authors: Hidayat M Wahyu , Asia Nurul , Ain Noer’ , Putri Rafika Hutami , Mirdad Rian Mizar , Leo Muhammad Alif
Published: August 2023

JasaKu’ merupakan sebuah website yang memudahkan masyarakat dalam memesan jasa perbaikan rumah dan membantu para tukang dalam mempromosikan jasa mereka. Namun, penggunaan teknologi informasi dalam bisnis ini juga memiliki tantangan, seperti masalah keamanan data dan biaya pengembangan website. Pengembangan website JasaKu’ sebagai solusi untuk memudahkan masyarakat dalam memesan jasa perbaikan rumah dan membantu tukang dalam mempromosikan jasanya. Penelitian ini menggunakan metode wawancara untuk memahami pengaruh website terhadap kemudahan perbaikan rumah oleh tukang dan masyarakat. Hasil analisis menunjukkan bahwa website jasa perbaikan rumah memiliki pengaruh yang signifikan dalam mempermudah perbaikan rumah dan meningkatkan kepercayaan antara tukang dan masyarakat.
The Effect Of Corporate Social Responsibility On Corporate Image Of PT Pertamina Geothermal Energy Area Kamojang (Study of the Kamojang Regional Communities)
Authors: Amin Fajar Fathul , Rahmadi Adi
Published: August 2023

This study aims to find out how Corporate Social Responsibility (CSR) and the corporate image of PT Pertamina Geothermal Energy Area Kamojang are, and how much influence CSR has on the corporate image of PT Pertamina Geothermal Energy Area Kamojang. This study used an explanatory survey method with a sample of 177 which were analyzed using descriptive statistics and simple linear regression. The results of the study stated that the influence of Corporate Social Responsibility on corporate image was 19.6%, while the remaining 80.4% was influenced by other factors. This research can be improved again by adding other variables and increasing the sample size and involving more stakeholders such as company employees and managers.
Adopsi Aplikasi Gobiz pada Pelaku UMKM Makanan dan Minuman di Pontianak
Authors: Yutika Fitri
Published: August 2023

Penelitian ini bertujuan untuk mengkaji adopsi aplikasi GoBiz pada pelaku UMKM di industri makanan dan minuman. Fokus penelitian ini adalah menggunakan teori UTAUT yang telah dimodifikasi untuk menganalisis faktor-faktor yang berpengaruh terhadap Adoption of GoBiz serta mengidentifikasi faktor yang paling signifikan dalam mempengaruhi perilaku adopsi aplikasi ini. Metode penelitian yang digunakan adalah survei dengan menggunakan kuesioner sebagai instrumen pengumpulan data. Sampel penelitian terdiri dari 60 responden yang merupakan pelaku UMKM makanan dan minuman di Kota Pontianak. Data yang terkumpul dianalisis menggunakan metode analisis Structural Equation Modeling. Hasil analisis menunjukkan bahwa Performance Expectancy, Perceived Technology Security, dan Price Value secara signifikan berpengaruh terhadap Adoption of GoBiz. Namun, terdapat hubungan yang berlawanan arah antara Perceived Technology Security dan Adoption of GoBiz, di mana semakin rendah pemahaman pelaku UMKM tentang keamanan teknologi, semakin tinggi adopsi aplikasi GoBiz. Variabel yang paling signifikan dalam mempengaruhi Adoption of GoBiz pada pelaku UMKM makanan dan minuman di Pontianak adalah Performance Expectancy dan Price Value. Kedua variabel ini memiliki pengaruh positif yang signifikan terhadap adopsi aplikasi GoBiz. Sementara itu variabel dalam UTAUT2 lainnya seperti Facilitating Condition dan Social Influence tidak ditemukan pengaruh yang signifikan pada perilaku adopsi aplikasi Gobiz. Penelitian ini memberikan kontribusi penting dalam pemahaman faktor-faktor yang mempengaruhi adopsi aplikasi GoBiz di kalangan pelaku UMKM makanan dan minuman di Pontianak.
Exploring The Benefits Of OpenCL Shared Virtual Memory: A Comparative Analysis On Integrated And External GPUs
Authors: Kruzel Filip , Nytko Mateusz
Published: August 2023

In this article, we test the feature of using a Shared Virtual Memory in OpenCL on Intel Iris Xe and Nvidia GeForce RTX 3060 GPUs. The first of these architectures is integrated into the CPU, so by definition, it uses the same RAM as the CPU. The second one uses a PCI-Express connection to transfer data between computer memory and separate GPU memory. OpenCL Shared Virtual Memory (SVM) feature allows zero-copy mechanisms to use the same address space for the CPU and Accelerator. In this work, the authors test the differences between classical implementations of the FEM numerical integration algorithm on GPU with explicit data sending between CPU and Accelerator and the SVM implementation with the transfer hidden from the user. Research should answer whether the advantages of using a weaker integrated card with faster data transfer will overcome the external graphics card's connection bottleneck.
Modeling The Soil-Tool-Root Or -Stem Interaction With Coupled Discrete Element And Mass-Spring Methods
Authors: Pasthy Laszlo , Tamas Kornel
Published: August 2023

In the course of this research, a so-called mass-spring method was implemented in an in-house developed two-dimensional discrete element software, which enables the simulation of deformable, tear-able bodies, such as plant residues (stems or roots), or other agricultural fibrous materials. The operation of the numerical methods was illustrated with simulations where a rigid plate was moved horizontally against a plant residue modeled by the mass-spring method, pulled in an assembly of particles modeled by the discrete element method, and pulled in a combination of these. When evaluating the results, it was found that the improved numerical methods are able to work stable both separately and in interaction with each other, thus in the future it is possible to take plant residues as stems and roots into account during the simulations of the tillage process with their coupled application.
Simulation Of Gravitational Lensing In The Roulette Formalism
Authors: Schaathun Hans Georg , Normann Ben David , Austnes Einar Leite , Ingebrigtsen Simon , Remoy Sondre Westbo , Runde Simon Nedreberg
Published: August 2023

Gravitational lensing refers to the deflection of light by the gravity of celestial bodies, often predominantly composed of dark matter. Seen through a gravitational lens, the images of distant galaxies appear distorted. A range of mathematical frameworks exist to model the lensing effect, but reconstructing the dark lens mass remains a difficult problem, where different models give different insight. This paper considers the Roulette formalism due to Chris Clarkson, and develops a simulator visualising the lensing effect according to the formalism. The objective is to enhance our understanding of the formalism in order to understand its strengths and limitation with respect to lens-mass modelling.
Interactive Ship Flow Simulation Enhanced By Neural Network Model In A Web Environment
Authors: Ichinose Yasuo , Gaspar Henrique M.
Published: August 2023

Hydrodynamic simulation of marine structures is a complex and time-consuming task that requires large, refined models to accurately estimate the behavior of ships. During the conceptual phase, therefore, these estimations may be more efficient if done with a mix of surrogate models and simplified simulations. We believe that AI and the web environment can contribute to providing a more precise answer and fast solution, especially when the design domain can be narrowed and properly estimated. This paper shows an attempt in this direction, describing a web-based real-time flow simulator that is composed of a Tenforflow.js-based convolutional neural network model with an image-based hull form representation. Some case studies demonstrate the advantages of a novel web-based prototyping environment in the conceptual and initial design of ships. The image-based hull form representation method with a convolutional neural network enables the design of not only main dimensions but also local shapes in an interactive web-based concurrent engineering environment. Our approach extends the neural network model of wake flow estimation to models of the prediction of resistance and pressure distributions on the hull surface and develops a novel web-based prototyping environment for the conceptual and initial design of ships.
Design, Modelling, And Simulation Of Biomimetic Underwater Vehicle
Authors: Piskur Pawel , Larzewski Bartosz , Kot Rafal , Szymak Piotr
Published: August 2023

This paper discusses mathematical model implementations and simulation in various software environments for Unmanned Underwater Vehicles (UUVs), especially biomimetic ones. Gaining accurate simulation models of UUVs is challenging due to many nonlinear phenomena that need to be analysed. Further, the sensors’ accuracy and disturbances made by the natural water environment are difficult to predict during the simulation. On the other hand, an accurate simulation model is needed during new algorithm tests provided for increased vehicle autonomy. As a result, mathematical models and their implementation into different software are analysed and discussed in this paper. The model based on nonlinear differential equations is compared to an object-oriented, physical model based on Matlab Simscape Multibody.
Numerical Research Of Obstacle Detection Using Forward Looking Sonar Model Based On A Beam Of Rays
Authors: Szymak Piotr , Kot Rafal
Published: August 2023

More often, Autonomous Underwater Vehicles (AUVs) are used in underwater space to carry out different missions from both civilian and military domains.One of the sensors needed underwater for autonomous motion is the Forward Looking Sonar (FLS), which is used mainly for obstacle detection. The paper undertakes the problem of the FLS modelling for testing and verifying, e.g. different obstacle detection algorithms. The model based on a beam of rays has been implemented for the popular type of FLS and then verified in a simulational environment.
Development Of Dynamic Fully Integrated Well-Reservoir Models For Simulation Of Oil Recovery Through Advanced Wells
Authors: Moradi Ali , Kumara Amaranath S. , Moldestad Britt M. E.
Published: August 2023

Oil recovery can be enhanced by maximizing the well-reservoir contact using advanced wells. The successful design of such wells requires an appropriate integrated dynamic model of the oil field, well, and production network. In this study, the model of advanced wells developed in the dynamic multiphase flow simulator OLGA® is linked to a reservoir model to develop transient fully-coupled well-reservoir models for the simulation of oil recovery through advanced wells. The obtained results from the developed models in OLGA are compared with the results from the widely used MultiSegment Well (MSW) model. Flow Control Devices (FCDs) are the key component of advanced wells and the functionality of the main types of FCDs is investigated. According to the obtained results, by employing advanced wells with an appropriate completion design, the production of unwanted fluids (water and/or gas) can be highly reduced while the oil recovery is slightly increased compared to using conventional wells. Besides, by comparing the performance of the OLGA and MSW models, it can be concluded that OLGA is a robust tool for conducting an accurate simulation of oil recovery through advanced wells. However, running such simulations with OLGA is relatively slow and may face convergence problems.
Modelling Emission Contributions To Air Quality Concentrations During A Covid-19 Lockdown
Authors: San Jose Roberto , Perez-Camanyo Juan L.
Published: August 2023

In this work, two air quality simulations are run to analyze the impacts of the reduction of anthropogenic emissions during COVID-19 lockdown over Madrid (Spain) area: one simulation considers the emission reductions during the lockdown (COVID simulation) and a second simulation, "business as usual" (BAU simulation) with an emissions' scenario without restrictions. Source apportionment techniques are used to identify and quantify the contributions from main pollution sources with the purpose to provide understanding on what measures should be taken to address them, and this work shows the potential of this technique. This study helps to elucidate the complex and nonlinear response of O3 and PM concentrations after a reduction of emissions, mainly from the transport sector, during the COVID-19 lockdown period.
Modulating The HVAC Demand Of A Warehouse To Provide Load Flexibility For Charging Electric Trucks
Authors: Dadras Javan Farzad , Najafi Behzad , Rinaldi Fabio , Campodonico Avendano Italo Aldo , Moazami Amin
Published: August 2023

The charging load of electric vehicles, the magnitude of which is expected to increase, creates complex balancing challenges for the power grid. Elevated thermal inertia of warehouses offers a promising flexibility potential that can be leveraged as a buffer in case of high power demands to avoid blackouts or notable increments in the user's cost of energy owing to the rise in the peak load. The present work investigates the feasibility of utilizing a conditioned warehouse's flexibility by modulating the indoor air temperature's setpoint to reduce the demand while electric trucks are being charged. Within this framework, energy simulation of a cooled fine storage warehouse has been used while considering the scenario of 2 electric trucks being charged (for a night shift delivery) immediately after the offices' are closed. The possibility of providing sufficient power to partially charge the trucks without exceeding the building's peak demand by increasing the warehouse's setpoint temperatures by 2.5 °C (for a maximum of 4 hours each day) has been investigated. It was found that the proposed approach enables the charging of the two electric trucks on 60% of the days of the cooling season (for an average duration of 170 minutes).
SCA-2023: A Two-Part Dataset For Benchmarking The Methods Of Image Precompensation For Users With Refractive Errors
Authors: Alkzir Nafe B. , Nikolaev Ilia P. , Nikolaev Dmitry P.
Published: August 2023

This paper considers the problem of precompensating images shown to users with various anomalies of refraction of the eyes (e.g. myopia or astigmatism) in situations where they are not equipped with glasses or other corrective devices. Researchers have proposed a considerable number of such precompensation methods, but to this day there has been no way to accurately compare their quality. We propose an original dataset, which we called “SCA-2023”, of images specially designed for this purpose. Its most important feature is the fact that it includes not only a set of ground-truth images to for implementing the precompensation transform, but also a separate set of images characterizing specific types and degrees of manifestation of the refractive errors. The second part of the dataset is used for computer simulation of the so-called retinal image (the distribution of light on the retina of an imaginary observer). We demonstrated the capabilities of our approach using three prior-art precompensation methods and found that not all the image comparison metrics provide adequate results when applied to precompensated retinal images.
Established Production Planning And Control And Its Enhancement With Sustainability
Authors: Trost Marco , Terbrack Hajo , Claus Thorsten , Herrmann Frank
Published: August 2023

Against the background of the energy crisis, shortage of skilled workers, demographic change and other drivers, sustainable development is also becoming increasingly important for industrial companies. In this respect, production planning and control has an enormous influence on relevant objectives. In classical approaches of production planning and control as presented in this paper, economic-oriented objectives are taken into account to a large extent in decision making. This paper demonstrates that besides these classical models, a variety of approaches exist to influence ecological and social targets through production planning. These different models are assigned to sustainability areas and outlined by exemplary literature sources. Further research is needed, for instance, in the joint consideration of sustainability criteria along different planning levels and sustainable dimensions.
Evaluation Of Alternative Configurations For A Manufacturing Plant: The Case Of An Italian Company In The Business Of Oil And Fuel Additives
Authors: Gucci Leonardo , Rinaldi Rinaldo
Published: August 2023

This paper describes a simulation study conducted on an Italian firm involved in the production and packaging of fluid mixtures, such as motorcycle and automotive lubricating oils and fuel additives. This Italian company needs to expand its production capacity, which is now close to saturation point, with the aim of being able to meet growing future demand. Using AnyLogic® commercial simulation software and in particular its Fluid Library, the manufacturing plant in its current configuration was modelled and studied. After addressing the initial transient problem and validating the model, the maximum increase in demand that can be met by the actual plant and an alternative configuration of the manufacturing plant were analysed. Thanks to results of the simulation study, it was possible to help the company management in the selection of the new manufacturing plant configuration by providing key performance metrics predicted by simulation.
Digital Twins for Supply Chains: Current Outlook and Future Challenges
Authors: Lugaresi Giovanni , Jemai Ziad , Sahin Evren
Published: August 2023

The growing complexity of worldwide supply chain networks, together with the increased occurrence of disruptive events stress the need for a focused introduction of digital support tools. Digital twins have encountered an increased interest from both industry and research for their capability to provide useful services in the short term. The number of contributions on digital twin-based methodologies for system design and production planning and control experienced a significant increase, while applications to supply chain management remain scarce. However, the recent investments in digitization and the concrete need for short-term planning capabilities mean digital twins can effectively aid enterprises in the management of their value chains. This paper provides an overview of the existing contributions regarding digital twins for supply chains, and gathers useful insights on both the current level of development and the future research challenges.
Simulating Hospital Acquired Infection Transmission With The Agents Assembly Ecosystem
Authors: Holda Przemyslaw , Rachwal Kajetan , Glowniak Wiktoria , Rojek Marcin
Published: August 2023

While agent-based models and simulations materialize in multiple areas, the existing simulation-focused agent platforms require in-depth programming knowledge, or are overly simplistic. In this context, the Agents Assembly (AASM) domain-specific language and platform have been recently proposed. The AASM ecosystem is highly scalable, as the software stack allows its straightforward deployment on multiple networked computers (physical or virtual machines). The domain-specific language has been designed to capture key concepts, needed to run agent-based simulations, while hiding their technical aspects. It can be thus stipulated that the AASM may provide a mid-way point between agent researchers and domain specialists. In this context, the aim of this contribution is twofold. First, to outline the reasoning behind, and details of, improvements introduced to the AASM since the original release. Second, show how the AASM can facilitate cooperation with researchers with a medical background. Here, the simulation models of the behavior of the Clostridium difficile bacteria in a hospital environment have been jointly conceptualized and experimentally explored. The developed model was focused on capturing features that reduce the spread of the bacteria. While the proposed scenarios are relatively simple, they illustrate the ease with which the AASM can be used to capture real-life phenomena.
Agent-Based Simulation And Analysis Of Infrastructure-As-Code Process To Build And Manage Cloud Environment
Authors: Mycek Andrzej , Grzonka Daniel , Tchorzewski Jacek
Published: August 2023

Widespread cloud systems present new challenges time and time again. An essential element of such environments is their management. The Infrastructure as Code model has been gaining popularity for some time. In work presented here, we have proposed an agent-based approach to process execution within the Infrastructure as Code approach and have performed several numerical experiments. The work also includes an original formal agent model of the system. The results obtained allow us to develop trade-offs regarding computational demand and utilization.
Novelty and uncertainty differentially drive exploration across development
Authors: Nussenbaum Kate , Martin Rebecca E , Maulhardt Sean , Yang Yi (Jen) , Bizzell-Hatcher Greer , Bhatt Naiti S , Koenig Maximilian , Rosenbaum Gail M , O'Doherty John P , Cockburn Jeffrey , Hartley Catherine A
Published: August 2023

Across the lifespan, individuals frequently choose between exploiting known rewarding options or exploring unknown alternatives. A large body of work has suggested that children may explore more than adults. However, because novelty and reward uncertainty are often correlated, it is unclear how they differentially influence decision-making across development. Here, children, adolescents, and adults (ages 8–27 years, N = 122) completed an adapted version of a recently developed value-guided decision-making task that decouples novelty and uncertainty. In line with prior studies, we found that exploration decreased with increasing age. Critically, participants of all ages demonstrated a similar bias to select choice options with greater novelty, whereas aversion to reward uncertainty increased into adulthood. Computational modeling of participant choices revealed that whereas adolescents and adults demonstrated attenuated uncertainty aversion for more novel choice options, children’s choices were not influenced by reward uncertainty.
Wandering albatrosses exert high take-off effort only when both wind and waves are gentle
Authors: Uesaka Leo , Goto Yusuke , Naruoka Masaru , Weimerskirch Henri , Sato Katsufumi , Sakamoto Kentaro Q.
Published: August 2023

The relationship between the environment and marine animal small-scale behavior is not fully understood. This is largely due to the difficulty in obtaining environmental datasets with a high spatiotemporal precision. The problem is particularly pertinent in assessing the influence of environmental factors in rapid, high energy consuming behavior such as seabird take-off. To fill the gaps in the existing environmental datasets, we employed novel techniques using animal-borne sensors with motion records to estimate wind and ocean wave parameters and evaluated their influence on wandering albatross take-off patterns. Measurements revealed that wind speed and wave heights experienced by wandering albatrosses during take-off ranged from 0.7 ∼ 15.4 m/s and 1.6 ∼ 6.4 m, respectively. The four indices measured (flapping number, frequency, sea surface running speed, and duration) also varied with the environmental conditions (e.g., flapping number varied from 0 to over 20). Importantly, take-off was easier under higher wave conditions than under lower wave conditions at a constant wind speed, and take-off effort increased only when both wind and waves were gentle. Our data suggests that both ocean waves and winds play important roles for albatross take-off and advances our current understanding of albatross flight mechanisms.Wind and ocean wave conditions experienced by albatrosses were estimated using an animal-borne recorder and revealed that take-off was easier under higher wave conditions.
Annihilation of action potentials induces electrical coupling between neurons
Authors: Schlötter Moritz , Maret Georg , Kleineidam Christoph J.
Published: August 2023

Neurons generate and propagate electrical pulses called action potentials which annihilate on arrival at the axon terminal. We measure the extracellular electric field generated by propagating and annihilating action potentials and find that on annihilation, action potentials expel a local discharge. The discharge at the axon terminal generates an inhomogeneous electric field that immediately influences target neurons and thus provokes ephaptic coupling. Our measurements are quantitatively verified by a powerful analytical model which reveals excitation and inhibition in target neurons, depending on position and morphology of the source-target arrangement. Our model is in full agreement with experimental findings on ephaptic coupling at the well-studied Basket cell - Purkinje cell synapse. It is able to predict ephaptic coupling for any other synaptic geometry as illustrated by a few examples.
Multiomics analyses reveal dynamic bioenergetic pathways and functional remodeling of the heart during intermittent fasting
Authors: Arumugam Thiruma V , Alli-Shaik Asfa , Liehn Elisa A , Selvaraji Sharmelee , Poh Luting , Rajeev Vismitha , Cho Yoonsuk , Cho Yongeun , Kim Jongho , Kim Joonki , Swa Hannah LF , Hao David Tan Zhi , Rattanasopa Chutima , Fann David Yang-Wei , Mayan David Castano , Ng Gavin Yong-Quan , Baik Sang-Ha , Mallilankaraman Karthik , Gelderblom Mathias , Drummond Grant R , Sobey Christopher G , Kennedy Brian K , Singaraja Roshni R , Mattson Mark P , Jo Dong-Gyu , Gunaratne Jayantha
Published: August 2023

Intermittent fasting (IF) has been shown to reduce cardiovascular risk factors in both animals and humans, and can protect the heart against ischemic injury in models of myocardial infarction. However, the underlying molecular mechanisms behind these effects remain unclear. To shed light on the molecular and cellular adaptations of the heart to IF, we conducted comprehensive system-wide analyses of the proteome, phosphoproteome, and transcriptome, followed by functional analysis. Using advanced mass spectrometry, we profiled the proteome and phosphoproteome of heart tissues obtained from mice that were maintained on daily 12- or 16 hr fasting, every-other-day fasting, or ad libitum control feeding regimens for 6 months. We also performed RNA sequencing to evaluate whether the observed molecular responses to IF occur at the transcriptional or post-transcriptional levels. Our analyses revealed that IF significantly affected pathways that regulate cyclic GMP signaling, lipid and amino acid metabolism, cell adhesion, cell death, and inflammation. Furthermore, we found that the impact of IF on different metabolic processes varied depending on the length of the fasting regimen. Short IF regimens showed a higher correlation of pathway alteration, while longer IF regimens had an inverse correlation of metabolic processes such as fatty acid oxidation and immune processes. Additionally, functional echocardiographic analyses demonstrated that IF enhances stress-induced cardiac performance. Our systematic multi-omics study provides a molecular framework for understanding how IF impacts the heart’s function and its vulnerability to injury and disease.