bluuebunny/crossref_metadata_2025 huggingface dataset:
Granular Jamming Gripper for an Ankle Rehabilitation Robot
Authors: Halouani Nahed , Shah Nazar Peiman , Pott Peter P.
Published: December 2024

Rehabilitation exercises are a crucial component in the treatment of ankle injuries. With the increasing demand on physiotherapists, many advances have been made in robotassisted ankle rehabilitation, which require an attachment mechanism of the foot or leg on the device. However, securely holding the ankle may cause physical discomfort and for the patient to feel constrained to the mechanism. This paper introduces a gripper of the plantar surface of the foot for ankle rehabilitation employing a universal Granular Jamming Gripper (GJG). It consists of a granule filled membrane that allows the patient’s foot to be immersed in it when it is filled with air and hardens around the foot when vacuum is applied. The paper also investigates the optimal filling percentage of the membrane, membrane thickness and the effect of granule types of different physical properties (ground coffee, table salt, coffee/salt mixture, and granular sugar) on the gripping ability and overall function of the GJG. Tensile and immersion tests demonstrated the suitability of the GJG for gripping a foot model as well as the increased gripping function with a 0.25 mm membrane filled to 60 % with granulated sugar.
Quantitative Convolutional Neural Network Based Multi-Phase XRD Pattern Analysis
Authors: Höfer Hawo H. , Orth André , Schweidler Simon , Breitung Ben , Aghassi-Hagmann Jasmin , Reischl Markus
Published: December 2024

X-ray diffraction (XRD) is commonly used to analyze phase compositions of crystalline samples. Medical applications include the analysis of biotechnological materials and gall- and kidney stones, where composition can inform pathology assessment. XRD analysis methods like Rietveld refinement requires expert knowledge, and multi-phase sample analysis is especially challenging and time consuming. Largescale medical and biotechnological experiments can therefore be hindered by the need to perform analysis tasks using XRD. Here, we present preliminary results on an automated convolutional neural network (CNN) based method for sample composition analysis using XRD patterns. It can aid experts’ analysis using initial estimations, and enable basic judgements for non-experts. Furthermore, we confirm the intuitive notion that analysis performance degrades with sample complexity through systematic investigation using a synthetic dataset.
Non-invasive vital parameter detection using neuromorphic cameras
Authors: Huhs Niklas , Kalashtari Niloofar , Kraitl Jens , Hornberger Christoph , Simanski Olaf
Published: December 2024

The non-invasive detection of vital parameters is gaining significance in the medical field through the use of various established and novel camera technologies and the use of artificial intelligence for data processing. A recently emerging type of imaging sensor, the neuromorphic camera, mimics the way the human eye perceives changes in its vision by responding to local changes in brightness for each pixel. The use of these neuromorphic cameras in the medical field is mostly unexplored and offers new possibilities. This research experiment is designed as a proof of concept for the use of neuromorphic cameras to detect the heart rate and respiration rate of a person by monitoring movement and subtle vibrations of the abdominal and chest area. The experimental setup consisted of a DVXplorer camera positioned 30 cm from a healthy person, directed at the abdominal and chest area. The respiration rate was detected with a mean absolute error of 0.66 bpm. The heart rate was detected with an accuracy of 95 % and a mean absolute error of less than 2 bpm. This shows the possibility to detect the heart rate and respiration rate of a person reliably, using neuromorphic cameras under controlled conditions. Future research will focus on improving reliability under more challenging environmental circumstances like varying light conditions and movement of the patient.
Development of a measurement setup to determine the frictional properties of tissuemimicking materials for vascular models
Authors: Karcher Alisa , Schäfer Jenny , Cattaneo Giorgio , Sanchez Daniela
Published: December 2024

In this study, a measurement setup was developed to determine the frictional properties between tissue-mimicking and implant materials. Nitinol and Polytetrafluoroethylene (PTFE) were selected as implant materials, while Polyvinyl alcohol (PVA) hydrogel and silicone were chosen as tissue-mimicking substrates and compared to porcine aortic tissue. The results showed a considerably lower friction coefficient between nitinol and all substrates compared to PTFE. PVA hydrogel showed a lower friction coefficient than silicone in contact to all implant materials, but still a higher coefficient compared to aortic tissue. Moreover, parameters such as PVA concentration and aging through storage influenced the frictional properties of PVA hydrogel. Finally, feasibility of the novel measurement setup to measure friction under physiological conditions as well as a comparison with previous studies are discussed.
Influence of TAVR-dilatation concepts on hydrodynamic properties under pulsatile flow
Authors: Kaule Sebastian , Stiehm Michael , Siewert Stefan , Öner Alper , Schmitz Klaus-Peter
Published: December 2024

Transcatheter aortic valve implantation (TAVI) for aortic valve stenosis can be seen as a disruptive technology that has become the standard treatment for previously inoperable patients over the past 15 years. A key component of the development process for new transcatheter aortic valve replacements (TAVR) is the hydrodynamic testing as part of real-time functional testing. Although, fundamental requirements, necessary testing methods, as well as functional environments, physiological and pathophysiological stress situations, are defined, resulting testing parameter ranges are only estimated. For this reason, two clinically established TAVR were tested in different parameter settings representing different characteristic load situations on a patient. In fact, the two TAVR with different dilatation concepts were tested under different cardiac outputs (CO) and the resulting effective orifice area (EOA), the closing and the leakage volume was measured and evaluated according to ISO 5840-3:2021. Regarding the two TAVR designs, it can be shown that the high radial force of the Lotus Valve contributes to an improvement in the sealing effectiveness of the TAVR. This is because the annulus can be pushed outward by the stent resulting in a better fit between the TAVR and the vessel wall. Additionally, the lamellar skirt of the Lotus Valve also appears to contribute to improved sealing. In the presented experiments, the smooth abluminal- mounted pericardial skirt of the Evolut PRO bioprosthesis does not seem to contribute to additional sealing. The developed test procedure aims to contribute to the establishment of new in vitro standards. Future work must involve applying the testing methods to additional clinically established TAVR as well as new developments.
Empirical Study of Magnet Distance on Magneto-Mechanical Resonance Frequency
Authors: Knopp Tobias , Mohn Fabian , Foerger Fynn , Thieben Florian , Hackelberg Niklas , Faltinath Jonas , Tsanda Artyom , Boberg Marija , Möddel Martin
Published: December 2024

Determining the position and orientation of a medical instrument is essential for accurate procedures in endoscopy, surgery, and vascular interventions. Recently, a novel sensor based on torsional pendulum-like magneto-mechanical motion has been proposed. This sensor is passive, wireless and inductively coupled to a transmit-receive coil array. This setup allows the determination of all 6 degrees of freedom using the characteristic resonance of the sensor. Additional physical quantities such as temperature and pressure can be measured based on the frequency of the sensor, which mainly depends on the distance between the two involved permanent magnets. In this study, we analyze a sensor composed of two magnetic cylinders with variable magnet-to-magnet distance and a basic physical model based on a dipole assumption. Experimental analysis of the resonance frequency and comparison with the model values show both qualitative and quantitative agreement with an average relative error of only 0.8 %. This validates the implemented model and shows the suitability of our magneticmechanical resonator made from cylindrical permanent magnets for sensing applications.
A setup for live AI support in interventional radiology
Authors: Komposch Jan , Malzacher Till , Baumgärtner Timo , Braun Michael , Roßkopf Johannes , Franz Alfred M. , Schmitz Bernd
Published: December 2024

Artificial intelligence (AI) has the potential to support time-critical stroke treatment. In a previous study we demonstrated the feasibility of deep learning based automatic classification for thrombus detection during thrombectomies, a catheter-guided procedure to remove occlusions of cerebral vessels. However, this method has yet to be tested during a live intervention. In this work, we present a setup to integrate AI based support in an angiography suite. A classification PC was connected to the angiography by means of a real-time video connection as well as a research interface for control signals. We found that video conversion in real-time does not affect the classification result in comparison to offline classification of DICOM data. Analyzing 50 video streams of previous cases, the system could classify digital-subtraction angiography (DSA) sequences within 13.3 seconds on average. This processing time can further be reduced to an average of 7.9 seconds with GPU acceleration. Additionally, the system successfully classified two DSA sequences acquired during live thrombectomy, identifying the presence of thrombi in less than 5 seconds. So far, the classification result has only been displayed in the control room of the angiography suite to demonstrate feasibility. In the outlook, however, we also discuss how the result can be displayed directly on the angiography screen.
On Stair Walk Recognition Using a Single Magnetometer-free IMU and Deep Learning
Authors: Kuhlgatz Timo , Jordine Marco , Lehmann Dustin , Seel Thomas
Published: December 2024

Human activity recognition (HAR) is an expanding area of research. Although sensors are becoming more readily available, there is a trend toward minimizing the number of associated sensors for better applicability. Neural networks are often employed for HAR, as they can identify movement patterns within data. To optimize the amount of useful information provided to the network, feature extraction methods are commonly applied. However, these feature methods complicate the data processing pipeline, and thus are less applicable to continuous real-time applications. In this work, we investigate the impact of using quaternions as input features for an LSTM network on HAR, specifically focusing on level walking and stair climbing activities, while also considering the inference time. We demonstrate that combining quaternions and raw IMU data, i. e., acceleration and angular rates significantly enhances classification accuracy without adversely affecting the inference time. By additionally adding an approximate estimate of the vertical position change to the input data, the classification accuracy is further improved to a value of 96.18%.
Advancement and evaluation of a medical organization device
Authors: Langer Ferdinand , Welte Korinna , Widmer Jette , Schmid Peter , Maier Thomas , Trick Michael
Published: December 2024

In anaesthesia and intensive care medicine, managing the multitude of signal and substance lines connected to patients presents challenges, risking dislocations, incorrect treatment, and increased workload for healthcare professionals. Existing solutions for signal and substance line management have seen limited acceptance, lacking universality and flexibility. Addressing these challanges, the “intelligent Medical Organization Device” (iMOD) was developed as a modular tool. iMOD, evaluated through simulator training, demonstrated positive results in intuitiveness and acceptance. Feedback highlighted areas for improvement, focusing on line insertion and fixation strength. The organization device may be a component in reducing treatment time and costs, increasing patient safety and improving the satisfaction of patients and healthcare professionals.
FDM technology for the prototyping of polymer stents
Authors: Lebahn Kerstin , Luft David , Fiedler Nicklas , Tautorat Carsten , Grabow Niels
Published: December 2024

Fused deposition modelling (FDM) technology allows the use of a wide range of thermally processable biocompatible or biodegradable polymers. Biomedical research is currently focusing on the development of 3D printed stents that can be biodegradable, as well as drugeluting. In this proof-of-concept study, a cylindrical substrate was integrated into a commercial FDM printer to establish a process for stent printing. Stents printed on a planar substrate were compared with those printed on the cylindrical substrate. The typical stepped structure along the stent struts on the planar print bed caused by layered printing is avoided with the cylindrical substrate.
A normalized quality of life approach for regulatory approval of medical devices
Authors: Leuchter Matthias , Philipp Mark , Siewert Stefan , Schafmayer Clemens , Schmitz Klaus-Peter , Kaule Sebastian
Published: December 2024

Patient-reported outcomes (PROs) are used in clinical trials to provide valuable evidence on the impact of treatment on patients’ symptoms, function and quality of life. High-quality PRO data from trials can inform shared decisionmaking, regulatory and economic analyses and health policy. The heterogeneity between the patient groups and the associated differences in morbidity and quality of life can be taken into account by standardization to the general population. As a result, our study shows that despite the retrospective design with the corresponding level of evidence, mesh repair of a ventral hernia leads to an equivalent result compared to tissue hernia surgery.
A short review of modification techniques for titanium dental implant surfaces
Authors: Oezcelik Sude , Haeger Andreas
Published: December 2024

In the world of dental implants, the essential determinant of success lies in the phenomenon of osseointegration, wherein titanium implants exhibit the ability for robust integration with the surrounding bone and tissue. Beyond the inherent qualities of titanium which make it an attractive candidate as an implant material, attention has shifted towards its’ tailored surface modifications. These methods help the implant manufacturers to modify the implant surface for successful osseointegration and higher chances of enduring implantation. This review explores different surface modification methods and their impact on the dental implant success.
The tribological behaviour of titanium alloys suitable for dental implants: A short review
Authors: Roegnitz Alexander , Haeger Andreas
Published: December 2024

Titanium and its alloys play a vital role in dental implantology, providing a stable foundation for replacement teeth and restoring oral function effectively. Titanium alloys, particularly CP-Ti and Ti-6Al-4V, are widely utilized due to their biocompatibility, corrosion resistance and mechanical properties. However, concerns arise regarding the release of cytotoxic elements and stress shielding effects. Addressing these concerns requires advancements in material design and tribological properties. Research focuses on developing low modulus β-type Ti-based alloys with improved wear resistance and biocompatibility, incorporating elements like niobium, tantalum or zirconium. This review explores the tribological implications of these advancements, focussing on the implantabutment interface, emphasizing the need for optimized titanium alloys for dental implant applications.
Tissue Puncture Event Detection in Needle Procedures using Vibroacoustic Signals - ResNet optimised Phantom Results
Authors: Serwatka Witold , Rzepka Dominik , Oran Hamza , Steeg Katharina , Krombach Gabriele , Stefanski Juliusz , Heryan Katarzyna , Friebe Michael
Published: December 2024

Vibroacoustic signals generated by the interaction of moving clinical devices, e.g. an aspiration or biopsy needle, with different tissues creates a distinct signal. These signals can be received via a dedicated audio sensor and subsequently analysed with the potential to provide information about location, tissue characterisation, and event classification. With that it could also be used as an additional and complementary guidance tool particularly for future robotic assisted procedures. In our laboratory research we used different phantoms with animal and artificial tissues, audio pre-processing, and subsequent training and optimisation of a ResNet model with a tissue event detection F1 score of 95.3% when compared to video based annotation tool. This result is very encouraging, as several possible improvements have been identified that will be implemented in the next research steps together with a robot assisted insertion and an automatic video annotation algorithm.
Electrocardiography Denoising via Sparse Dictionary Learning from Small Datasets
Authors: Steinbrinker Tabea , Spicher Nicolai
Published: December 2024

Wearable electrocardiography monitors, e.g. embedded in textile shirts, offer new approaches in diagnosis but suffers upon limited computational capacities. Hence, we propose and evaluate a lightweight algorithm for electrocardiography denoising via sparse dictionary learning, targeting two types of noise: baseline wander and muscle artifacts. For each type of noise a dictionary is built using K-singular value decomposition. This iterative method alternates between finding a sparse representation for every training signal and then updating every atom of the dictionary on its own. A sparse representation is found using the orthogonal matching pursuit algorithm. The atoms are updated exploiting the properties of the singular value decomposition. For further sparse approximation, we use the basis pursuit denoising algorithm. Electrocardiography data stems from synthetically-generated signals as well as the freely-available Brno University of Technology ECG Quality Database. Noise is added to the signals using the MIT-BIH Noise Stress Database. Our results regarding baseline wander demonstrate that the algorithm outperforms the American Heart Association-recommended bandpass filter w.r.t. signal-to-noise ratio. Moreover, a small number of training data is sufficient for satisfying results which indicates the suitability of the method for wearable hardware with low memory and power specifications.
Approach for decontaminating large rooms by dry fogging
Authors: Buhl Sebastian , Stich Alexander , Bulitta Clemens
Published: December 2024

Many factors can negatively affect the effectiveness of cleaning and disinfection measures. Due to this situation, the Technical University of Amberg-Weiden in cooperation with aquagroup AG investigated a dry fogging technology as an automated system for decontamination of limited volumes. Preliminary tests in smaller rooms had already shown positive results in this context. An upscaling of the method would therefore be of interest, as it could be used to decontaminate rooms that are difficult or very costly to reprocess due to their size or layout. In order to evaluate the use of this system in operating theaters or larger rooms, a test setup was established in an aquagroup AG painting hall. In addition, thereby the effectiveness of the method can be evaluated in unprepared and unsealed rooms with high ventilation. Our results show a maximum germ reduction of over 5.7 log levels on tiles and 5.2 log levels on plastic. If further studies confirm these initial positive results, the dry fogging we are investigating could be another option for cleaning or disinfecting large areas quickly and effectively.
EEG-Based User Identification using Machine Learning and Deep Learning Approaches
Authors: Sushma S. , Venkat S. , Mohanavelu K. , Fredo Jac A. R. , Bobby T. Christy
Published: December 2024

In recent years, Electroencephalogram (EEG) based user authentication systems have gained significant interest as an innovative approach for identity verification. EEGs are considered to be a novel biometric attribute due to the individuality of each person’s cerebral activity patterns. This work explores the feasibility and efficiency of utilizing EEG signals, generated in response to emotional stimuli, for user authentication applications, by implementing Machine Learning (ML) and Deep Learning (DL) approaches. Support Vector Machine (SVM), Random Forest (RF) classifier and 1D Convolution Neural Network (CNN) were employed to evaluate and compare the performance of EEG-based user authentication for two publicly available EEG datasets, namely DEAP and DENS database. The performance of EEGbased user authentication was significantly high in LAHV emotional state for DENS dataset, achieving an accuracy of 99.2 % and 92.59 % with SVM and modified 1D CNN, respectively.
A virtual reality experimental setup to explore volitional control in lower limb prostheses
Authors: Voß Matthias , Quellhorst Marie , Beckerle Philipp
Published: December 2024

Active leg prostheses can provide individuals with an amputation with motion support and thereby enable better participation in societal life. However, their versatility of use is still constrained, particularly with respect to volitional control by the user. Promising volitional control methods like employing muscle and joint model simulations to mimic human motor control are actively researched. However, experimental paradigms currently either include costly hardware setups or are limited to very simplistic virtual setups. For rapid control prototyping and facilitating the involvement of healthy participants, we propose an immersive virtual reality environment, focusing on ankle prostheses. Based on a theoretical discussion and a pilot study, we outline the potential of this method for agile development of lower limb volitional controllers.
Institute of Technical Medicine (ITeM), Hochschule Furtwangen University (HFU), Germany
Authors: Winkler Simon , Sackmann Benjamin , Priwitzer Barbara , Lauxmann Michael
Published: December 2024

Machine learning algorithms and neural networks have recently been used for the classification of middle ear disorders using wideband acoustic immittance and wideband tympanometry data. This study applies the extreme gradient boosting (XGB) classifier, trained on simulated WAI data, to classify real measured data for normal, otosclerotic, and disarticulated ears. The achieved macro recall of 82 % is comparable to other approaches trained with real measurement data. The interpretability methods LIME and SHAP are used to quantify each feature’s contribution, both revealing energy reflectance between 600-800 Hz as a key feature for all classes. The key feature identified matches the differences that can be visually observed in the training and test data. However, the obtained feature contributions don’t provide enough distinguishable information to recognise incorrect or uncertain classifications.
Core design and neutronics analysis of lead liquid metal-based heat pipe cooled reactor for undersea purpose
Authors: Yinusa Taiwo Saheed , Mei Huaping , Chen Chao , Baidoo Isaac Kwasi , Liu Shuyong , Li Taosheng
Published: December 2024

Various heat pipe-cooled reactors have been conceptualized and designed in recent years, ranging from kilowatts to megawatts, suitable for remote and extreme environments. However, existing designs employ monolith cores, which are saddled with heat transfer deteriorations due to thermal expansion and subsequent deformations are some of the key challenges facing monolith heat pipe reactors. Addressing this, a novel 300 kW heat pipe has been designed by introducing lead liquid instead of the monolith. A comprehensive Monte Carlo neutronics analysis of the designed core has been conducted including its thermal analysis. The core design comes with the following parameters: fresh core excess reactivity of 2.9914 $ that can support a 10-year life cycle, and a negative temperature coefficient of −0.1648 pcm/K. The axial and radial peak power factors at critical states were calculated to be 1.67 and 1.35 respectively. Preliminary thermal hydraulics analysis shows maximum temperatures of 1044 K under normal operation and worst-case accident scenarios (3 heat-pipe failures) of 1,149.9 K. These temperatures are lower than the melting point of uranium nitride fuel and lower than the possible heat pipe boiling failure limit at 1,300 K. Thus, the possibility of fuel melting/heat pipe boiling accidents is avoided. A hypothetical criticality accident was simulated, assuming the core was flooded with water, leading to an increased fission rate. However, the implementation of three emergency rods in the core ensures the subcritical of the reactor.
La construcción de hegemonía durante los años ochenta en Argentina. La alfabetización como estrategia del Estado para educar el consenso
Authors: Wanschelbaum Cinthia
Published: December 2024

En el presente artículo presentamos algunas ideas y conceptos acerca de la relación entre hegemonía y educación a partir del estudio de un momento histórico determinado de la historia Argentina, la presidencia de Raúl Alfonsín (1983-1989), y del análisis de una política educativa implementada por el gobierno: el Plan Nacional de Alfabetización. Entendemos que el Plan consistió en una estrategia de la pedagogía de la hegemonía (alfonsinista) para educar el consenso. Se orientó a la transmisión, difusión e internalización de una concepción del mundo para aportar a la consolidación de la legitimidad necesaria hacia el (nuevo) proyecto hegemónico.Summary
Identidades professorais em movimento no contexto do sindicalismo docente: a criação do 24º Núcleo do CPERS/SINDICATO (Pelotas/Brasil)
Authors: Ondina Vieira Ferreira Márcia , Völz Klumb Coronel Márcia Cristiane
Published: December 2024

Objetivamos reconstituir o processo de fundação do 24º Núcleo do CPERS/SINDICATO, balizando-nos em dois eixos: as transformações nas identidades docentes expressas quando da filiação a um sindicato de classe; o impacto da ação de alguns indivíduos com específica trajetória de militância. Utilizamos uma estratégia qualitativa de investigação (análise documental e entrevistas semi-estruturadas com membros da Comissão Pró-Núcleo). Destaca-se a organização do professorado pelotense num período de lutas contra a ditadura militar, sob a direção de docentes com participação ativa na greve estadual de 1979. A posse da primeira diretoria (31/10/1980) consolidou uma perspectiva identitária da categoria com características mais proletarizadas.
Apresentação
Authors: Vaz Peres Lúcia Maria , Fortes de Oliveira Valeska
Published: December 2024

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POR ENTRE RESSONÂNCIAS E REPERCUSSÕES... Exercícios hermenêuticos na pesquisa que alinha os campos do imaginário e da (auto)biografia
Authors: Vaz Peres Lúcia Maria
Published: December 2024

Este texto tem como objetivo principal realizar um exercício hermenêutico sobre algumas repercussões da pesquisa desenvolvida no Grupo de Estudos e Pesquisas sobre Imaginário, Educação e Memória (GEPIEM). O referido grupo vem desenvolvendo, nos últimos 10 anos, pesquisas que primam pelas interfaces entre os tópicos específicos que tratam sobre o imaginário e as (auto)biografias como projetos de pesquisa-formação. Nosso intuito no ensino, na extensão e na pesquisa tem sido, então, a busca do refinamento da sensibilidade e da inteligência que constitui a “leitura feliz” de Bachelard. Da mesma forma que a escrita, a expressão corporal, a dança, o canto, a música, o teatro, as artes visuais são modos de expressão da imaginação criadora.
TRAS LAS HUELLAS DE HERMES: LA HERMENÉUTICA SIMBÓLICA COMO CONTRIBUCIÓN A LOS ESTUDIOS DEL IMAGINARIO
Authors: Garagalza Luis
Published: December 2024

La hermenéutica es un movimiento filosófico que se centra en el problema de la interpretación. La interpretación ahora se entiende como el modo de ser del ser humano y como el modo de ser de la realidad: si somos capaces de interpretar la realidad es porque la realidad es como un texto o como un lenguaje que pueda ser interpretado. La interpretación y el lenguaje son por lo tanto, leitmotiv de la hermenéutica. Nuestra contribución tiene como objetivo mostrar la importancia de los símbolos en este contexto. Así, la hermenéutica filosófica se abre a una hermenéutica de la cultura que se articula en la tensión entre una simbología matriarcal y una simbología patriarcal, y busca la mediación en una simbología fratriarcal o fraternal.
A POÉTICA DO INTELECTO: RELAÇÕES ENTRE O IMAGINÁRIO E A TECNOLOGIA NA FORMAÇÃO TÉCNICO-PROFISSIONAL
Authors: Assunção Alexandre Vergínio
Published: December 2024

O objetivo deste trabalho é mostrar as possíveis relações entre o imaginário e a tecnologia na formação técnico-profissional. Para tal, apoia-se nos estudos sobre o imaginário e a tecnologia, principalmente com Gaston Bachelard, Gilbert Durand e Abraham Moles. Inicialmente, procura-se esclarecer o sentido dado aqui a formação técnico-profissional. A seguir, o significado das palavras “imagem”, “imaginação”, “imaginário”, “técnica” e “tecnologia”. Depois se descreve o modo como a teoria e a prática da formação/atividade técnico-científica se junta, em nível epistemológico, aos estudos e à problemática do imaginário. Mostra-se que o homem, tanto na arte como na técnica, é um ser essencialmente criador e toda invenção tem sua origem em fontes de produções psíquicas que decorrem das forças imaginárias. Por fim, aponta-se que na poética do intelecto existem relações entre a imaginação e a razão, portanto entre o imaginário e a tecnologia.
Percepções de docentes sobre as mudanças curriculares do Ensino Médio no Brasil
Authors: Silveira da Silva Rejane Conceição , Corrêa Pereira Elaine , Costa Machado Celiane
Published: December 2024

O presente artigo apresenta os resultados de uma pesquisa de abordagem qualitativa, realizada com docentes do Ensino Médio, sobre suas percepções e vivências em relação ao contexto de mudanças curriculares iniciadas na década de 1990, com a reforma do Ensino Médio. Para tal estudo foram realizadas entrevistas semiestruturadas com dez professores atuantes na rede pública e/ou privada da cidade de Rio Grande, estado do Rio Grande do Sul. Os resultados obtidos mostram as dificuldades enfrentadas na implementação das mudanças e apontam a necessidade de modificações estruturais do sistema escolar, valorização da profissão de magistério e aprimoramento na formação docente. Com este estudo espera-se contribuir para as discussões sobre as mudanças do Ensino Médio no atual cenário educacional brasileiro.
Aprendizagem e avaliação: a ação docente e as implicações no autoconceito de um aluno do ensino fundamental
Authors: Sotoriva Damke Anderleia , Peres Gonçalves Josiane
Published: December 2024

Esta pesquisa discute a relação entre aprendizagem, avaliação e o autoconceito dos alunos, especialmente o caso de um aluno de terceiro ano do Ensino Fundamental. Nesse contexto, explora questões importantes para compreender o assunto, como, por exemplo: O que significa avaliar? Quais são as implicações das práticas avaliativas para o desenvolvimento do aluno? Qual é a relação entre as experiências de avaliação da aprendizagem e o autoconceito? Com base na literatura educacional, analisa a ação docente diante da avaliação e sua relação com o autoconceito e o desempenho do aluno pesquisado. Ao final, sistematiza alguns elementos importantes para que os professores possam refletir, dentre eles, as práticas de avaliação, que devem constituir possibilidades de interação e de aprendizagem, nas quais os alunos possam construir um autoconceito positivo, bem como seu impacto na formação do autoconceito e no desenvolvimento e aprendizagem dos alunos.
Concepções pedagógicas dos professores de Jornalismo
Authors: Bianchini Ferreira Jociene Carla , Malusá Silvana
Published: December 2024

Este artigo versa sobre a perspectiva que os docentes-jornalistas, atuantes em cursos de Jornalismo de universidades públicas (federais e estaduais brasileiras), têm sobre as concepções de docência universitária, prática profissional e saberes docentes. A pesquisa de cunho quantitativo e qualitativo contemplou tanto questões fechadas, por meio de assertivas que deveriam ser valoradas a partir da escala Likert, como perguntas abertas, que foram articuladas a partir da análise de conteúdo. No momento da pesquisa, 49 universidades públicas foram levantadas por ofertarem o curso de Jornalismo, estimou-se um total de 595 sujeitos, sendo que apenas 184 (30,9%) foram os respondentes entre os meses de abril e maio de 2013. Como resultado, perfilou-se o grupo de professores respondentes, além de mostrar uma concepção de docência de tendências humanista e cognitivista, porém arraigada ainda a velhas tendências. Evidenciou-se a preocupação dos docentes-jornalistas em melhorar a sua prática em sala de aula.
Uwa'kürü
Authors: Nere de Lima Ramon
Published: December 2024

Este artigo visa refletir sobre alguns aspectos presentes na Amazônia Sul-Ocidental relacionados ao processo histórico de racialização dos povos originários da região, a partir da ideia de seringalidade (Souza, 2016). Do ponto de vista teórico-metodológico se trata de uma pesquisa histórica (Barros, 2017), qualitativa (Godoy, 1995), descritiva (Gil, 2008), bibliográfica (Severino, 2007). Percebe-se que parte da história da Amazônia Sul-Ocidental, especialmente do Acre, construiu-se dentro de uma perspectiva epopeica, patriótica (Carneiro, 2017) elevando determinados grupos e sujeitos ao primeiro plano e relegando alguns indivíduos e agrupamentos a um silênciamento (Pimenta, 2004), assim sendo, necessário uma história crítica contrapondo a narrativa ufanica que racializou os povos indígenas.
Concessões de sesmarias e Agência Indígena
Authors: Diniz Ribeiro João Victor
Published: December 2024

Os povos originários exerceram diversas formas de agência durante a ocupação dos europeus nas Américas, apesar de muitas vezes serem apresentados como sujeitos passivos da sociedade colonial. Esta pesquisa analisa a participação de indígenas nas concessões de sesmarias na região ao pé da “Serra do Pitavary”, durante a ocupação da Capitania do Siará Grande. Foram levantadas sesmarias entre os anos de 1683 e 1722, as quais foram observadas a partir da literatura jurídica e da “Nova História Indígena”. Os registros mostram que indígenas aldeados solicitaram terras a partir de vínculos criados com outras figuras da colonização e da necessidade de subsistência. Os resultados apontam que aqueles sujeitos não se limitaram à subordinação ao regime tutelar da ordem colonial, mas se apropriaram desse regime em seus discursos para resguardar direitos e interesses vinculados à proteção da terra.
“Indigenismo emancipatório” e “lugar de memória subterrânea” na região amazônica
Authors: Cardoso Barbosa Vitória Luyza
Published: December 2024

O presente artigo analisa a vigilância, por parte do governo brasileiro, da atuação indigenista do Grupo Magüta - por meio do Centro de Documentação e Pesquisa do Alto Solimões (CDPAS) - junto aos Tikuna a fim de assim classificar suas agências sob dois conceitos: “lugar de memória subterrânea” e “indigenismo emancipatório”. Mesmo após o fim da Ditadura Militar, durante o processo de Redemocratização, indígenas Tikuna e antropólogos do Museu Nacional/UFRJ sofreram um processo de vigilância constante por parte do governo brasileiro. Com a presente análise, afirmo que, ao criar o Centro de Documentação e Pesquisa do Alto Solimões (CDPAS), o Grupo Magüta opunha-se às práticas indigenistas tutelares hegemônicas do Estado que possuem raízes históricas coloniais e colonialistas3 que se estabelecem, ainda, em relação aos povos indígenas no Brasil. Nesse sentido é que argumento que o Magüta/CDPAS se constituiu enquanto um lugar de memória subterrânea exercendo um indigenismo emancipatório junto aos Tikuna.
Para todas as grandes senhoras
Authors: Antonello Flores Isabel
Published: December 2024

Este artigo busca compreender qual a alquimia destinada às mulheres e a relação dessa com o contexto em que viviam. Para tal, utiliza como fonte o livro de segredos escrito por Isabella Cortese e intitulado I secreti de la signora Isabella Cortese, ne'quali si contengono cose minerali, medicinali, arteficiose, & Alchimiche, & molte de l'arte profumatoria, appartenenti a ogni gran Signora. Con altri bellissimi Secreti aggiunti. A análise de tal documento foi feita articulando os conceitos de diferentes campos historiográficos, tais como gênero, história cultural e esoterismo. Com isso, percebemos como a alquimia para mulheres pode ser entendida tanto de forma espiritual quanto prática, relacionando-se com aquela destinada aos homens. Ainda, dialoga com o contexto do movimento renascentista dos territórios italianos do século XVI, com aspectos econômicos e da dimensão do trabalho possível para aquelas mulheres.
Composição das Pastas Cerâmicas Guarani da Área Arqueológica da Foz do Chapecó, Alto Rio Uruguai
Authors: Bertoncello Aline , Carbonera Mirian , Loponte Daniel , Santos Marcos César Pereira , Lourdeau Antoine
Published: December 2024

Neste artigo, analisamos as pastas cerâmicas de vasilhames da Unidade Arqueológica Guarani (UAG), por meio do estudo de 29 lâminas petrográficas realizadas a partir de fragmentos de recipientes recuperados em quatro sítios arqueológicos do Holoceno Tardio, localizados na área da Foz do Chapecó, alto rio Uruguai, Santa Catarina (Brasil). O objetivo geral é identificar a composição das pastas utilizadas para a confecção da cerâmica, cuja elaboração reflete o comportamento cultural dos artesãos quanto à preparação das pastas de argila, a fim de utilizá-la na confecção da cerâmica. Neste trabalho, analisamos a composição geral das pastas, os tipos de inclusões e a quantidade de poros. Como principais resultados, observou-se que todas as pastas apresentam uma composição similar quanto à proporção de inclusões e quantidade de poros, indicando técnicas de confecção recorrentes para sua elaboração. As diferenças mais significativas observam-se em relação aos tipos de inclusões utilizadas, que variam entre quartzo, minerais opacos, óxidos, chamote e fragmentos líticos.
Vzdělávání jako podnikání: Role soukromých škol v procesu institucionalizace komerčního školství v Čechách do roku 1918
Authors: Kadlec Petr
Published: December 2024

The study is dedicated to the role of private schools in the process of institutionalization of the commercial education between the half of the 19th century up to 1918. It takes into account the quantitative development, organisation and study programmes. The author aims to highlight the specifics of these schools and their complicated relationship with other commercial educational institutions. From a nationwide perspective the text is delving into the level of specific schools.
Insécurité du logement et insécurité alimentaire dans l’Inuit Nunangat
Authors: Balla Ndegue Séraphin Guy , Hervé Caroline
Published: December 2024

La crise du logement et l’insécurité alimentaires sont des préoccupations majeures dans les communautés inuites du Canada, et tout particulièrement au Nunavut. Pourtant, bien que les débats autour de ces questions soient particulièrement féconds, la corrélation entre les deux problèmes a jusque-là été faiblement adressée par les recherches anthropologiques. Sur la base des données collectées à Cambridge Bay, cet article montre que l’insécurité alimentaire a partie liée avec l’histoire coloniale qui aura sédentarisé les Inuits et bouleversé leur espace social alimentaire, ainsi qu’avec une conjoncture environnementale et économique fragile. Les Inuits se retrouvent aujourd’hui confrontés à la baisse des activités de collecte, aux changements climatiques, à la faiblesse des revenus et au problème de logement. Mais au cœur de tous ces problèmes aux racines structurelles, la vétusté et le manque de logements viennent aggraver l’insécurité alimentaire en ce qu’ils induisent des dépenses supplémentaires, la surpopulation des ménages et contraignent beaucoup d'Inuit à l’itinérance. Les solutions à l’insécurité alimentaire doivent donc, sans négliger les autres aspacts, prendre en compte la question du logement ; ce qui requiert aussi d’impliquer les Inuits eux-mêmes dans les décisions y afférentes.
El problema del gusto y los dilemas antropológicos del cuerpo propio en Hans Blumenberg
Authors: Álvarez Solís Ángel Octavio
Published: December 2024

El ensayo discute el problema del gusto en la obra de Hans Blumenberg, particularmente analiza las condiciones antropológicas por las que es posible el acto de comer. La primera parte describe el problema de los sentidos menores como el gusto, el olfato y el tacto en la antropología de los sentidos. La segunda parte problematiza el sentido del gusto y su rendimiento fenomenológico. La última parte postula, contra la verticalidad de la mirada, la horizontalidad del gusto como proceso fundante de la antropogénesis.
¿Quién merece morir de hambre? Derechos, Meritocracia y Pobreza
Authors: Pinzani Alessandro
Published: December 2024

En este artículo discutiré primero (sección 1) las razones históricas por las cuales, en Brasil, en lugar de aceptar la idea de que la pobreza represente una violación grave de los derechos humanos o de la autonomía y dignidad, predominan dos narrativas hegemónicas: la del privilegio y la del mérito individual. Estas narrativas, sin embargo, no son exclusivas de la sociedad brasileña, sino que están presentes también en las relaciones entre el Norte y el Sur global (sección 2). Finalmente, confrontaré la gramática de los derechos y la narrativa del mérito individual, señalando sus respectivos límites y, sobre todo, cómo la narrativa hegemónica del mérito acaba neutralizando el potencial emancipador de la gramática de los derechos, transformando de hecho derechos en privilegios e impidiendo que la extrema pobreza sea vista como una violación de los derechos básicos de las personas que se encuentran en tal situación (sección 3).
Critical observations on neoliberal capitalism, the political subject and the socio-political crises of the 21st century. A general cartography of the present and future of Latin America, Europe, Africa and Asia.
Authors: Barria-Asenjo Nicol A , Maiwald Florian , Camargo Castillo Javier , Willems Brian Daniel , T. Ximenes Fernando A. , Medina Polo Simone A. , Salas Gonzalo , Katkowski Krzysztof , Ayala-Colqui Jesús , Perunović Andrea
Published: December 2024

El presente texto tiene por objetivo rastrear, a través de la filosofía moral de Adorno, la posibilidad de actuar éticamente en un mundo falso, injusto y lleno de contradicciones. Con miras a ello, analizaremos primeramente las características de dicho mundo; acto seguido, presentaremos la necesidad de los individuos de proyectar sus actos en un mundo indeterminado para poder subjetivarse a través del acierto. Posteriormente, plantearemos que en una sociedad administrada con todas las variables fijadas no es posible que el individuo se subjetive. Por último, trazaremos las coordenadas para la emergencia del sujeto moral en un contexto de inmoralidad.
Miscibility, thermal, and mechanical properties of recycled waste tire rubber-modified polystyrene sustainable composites
Authors: Tian Aoxue , Zhang Jinlong , Wang Yong
Published: December 2024

Waste tires represent an important source of polymer waste. The ground tire rubber derived from waste tires is a recycled product that can be combined with polystyrene (PS) to produce high-performance PS and waste rubber composites. To improve composite material performance, surface grafting modification of waste tire rubber with styrene to enhance properties of PS composites as a novel approach was investigated. The surface morphology and structure of polystyrene grafted waste tire rubber powder via a conventional free radical polymerization were confirmed successfully using scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy analyses in addition to the Fourier-transform infrared spectroscopy (FTIR). The comparative mechanical and thermal property analysis of PS sustainable composites with recycling waste tire rubber powder with and without surface grafting modifications indicated an approximate 4-fold increase in the impact strength of polystyrene grafted waste tire rubber reinforced PS sustainable composites in addition to enhanced interfacial miscibility. The development of sustainable composite materials from recycled waste tire provides a novel avenue to achieve close-loop polymer recycling, which is of significance in the development of the circular economy and an environmentally friendly society.
Bleached rice straw lignin: Thermal-chemical properties and its application in polyurethane-based paper coatings
Authors: Nurcahyani Puji Rahmawati , Fatriasari Widya , Abdullah Zaimatul Aqmar , Hassan Nurul Husna Mohd , Lee Seng Hua
Published: December 2024

Rice straw lignin (LRS) tends to be dark in color, which makes it less appealing for material applications. Therefore, a bleaching process involving lignin oxidation is of interest. This study aimed to investigate the mechanical and chemical properties of bleached LRS and explore its potential application in PU-based paper coatings. LRS and commercial lignin (LC) were subjected to bleaching using 29% H2O2 through oxidation treatment. The bleached lignin was then used to prepare PU-based paper coatings. The effects of bleaching treatment on the functional groups, structural, and thermal properties of lignin, as well as the water resistance of the PU composites were assessed. The oxidation treatment resulted in a reduction in the phenolic hydroxyl content, methoxy content, antioxidant activity, and equivalent weight of lignin. However, LRS exhibited greater thermal resistance than did LC. The bleached LRS was successfully integrated with toluene di-isocyanate (TDI) to produce transparent polyurethane. This polyurethane was then applied as a coating for paper containers, which successfully held cold water for over 4 h without leaking, indicating its outstanding water repellency.
A Review of the Intrinsic Parameters Affecting the Elastic Characteristics of Heterogeneous Carbonate Reservoirs: Insights from Laboratory Assessments
Authors: Hazaveie Seyed M. , Aminshahidy Babak , Nikbin Mohammad
Published: December 2024

This research provides an in-depth analysis of how various parameters such as mineralogy, density, porosity, temperature, pressure, and structural features impact the velocities of sonic waves in carbonate rocks. Our findings reveal that the mineral composition significantly influences the elastic behavior of these rocks. The density and elastic properties of minerals, especially clay minerals, play a crucial role in affecting porosity and predominant pore types. The porosity of carbonate reservoirs impacts their elastic properties, leading to variations in sonic wave velocities depending on the different pore types present. For a given porosity, the velocities can vary considerably due to the presence of diverse pore types within the pore space. Non-interconnected porosities with spherical or near-spherical shapes, along with microporosity, alter the effective elastic properties of the rock. Additionally, temperature affects the velocity-porosity relationship in rocks, with experimental results showing a decrease in P-wave velocity as temperature increases. Under reservoir conditions, wave velocity in carbonate rocks is influenced by factors such as confining pressure, temperature, gas saturation, and effective stress. Specifically, P-wave velocity increases with confining pressure as soft pores and cracks gradually close, enhancing the dry rock bulk shear modulus. Conversely, rising temperatures cause a slight decrease in velocities and an increase in attenuation. In conclusion, this study enhances our understanding of the physical properties and behavior of carbonate rocks under reservoir conditions, thereby contributing to the exploration and production of hydrocarbon resources.