bluuebunny/crossref_metadata_2025 huggingface dataset:
ANÁLISE DOS IMPACTOS AMBIENTAIS OCORRIDOS PELA OCUPAÇÃO IRREGULAR NO MANGUEZAL DO ESTUÁRIO DO RIO CEARÁ - FORTALEZA, CE
Authors: Gomes Bárbara Alexandra Alexandra Costa
Published: December 2020

Este trabalho de monografia tem como principal propósito analisar os impactos no manguezal do Rio Ceará, decorrentes da ocupação irregular, indicando medidas que ajudem na conservação e preservação do manguezal, levando para a sociedade um ambiente ecologicamente saudável e equilibrado. O litoral do Brasil é a área mais densamente ocupada de todo o território nacional, pois é na zona costeira que as principais atividades humanas se desenvolvem de modo intenso, onde destaca-se a moradia, comércio, turismo e instalações portuárias. No Ceará, essas atividades intensificaram-se a partir da década de 1940 com início da construção do Porto do Mucuripe. As áreas mais afetadas de modo negativo com a expansão urbana foram as dunas, praias e manguezais, sendo as áreas de dunas e mangues as mais fortemente degradadas. Os manguezais são conhecidos por serem os mais produtivos dos ecossistemas costeiros, além da sua importância para a reprodução da fauna marinha e refúgio para aves migratórias. No entanto, os manguezais veem sendo degradados e impactados nos últimos 20 anos por diversas atividades econômicas como: a carcinicultura, atividade salineira e especulação imobiliária. Sabe-se que tais atividades são importantes para a economia da sociedade, mas infelizmente acarreta sérios danos para o ambiente social e natural. No manguezal do Rio Ceará os conflitos sociais e a degradação ambiental são bastante visíveis, pois se observa aumento nas taxas de criminalidade, falta de infraestrutura e saneamento básico, precarização da saúde e educação. Deve-se levar em consideração que a área do estuário do Rio Ceará está muito poluída, devido ao lançamento de efluentes doméstico e o descarte incorreto do lixo. A pesquisa desenvolveu-se basicamente através de levantamento bibliográfico, trabalho de campo e compilação das informações coletadas, além da confecção de mapas. Para a análise da área de estudo usou-se a Teoria Geossistêmica, desenvolvida por Victor Sotchava nos anos de 1960, de modo a identificar e analisar os impactos observados na área de estudo.
OS COMPONENTES FÍSICO-NATURAIS DO ESPAÇO E A GEOGRAFIA ESCOLAR
Authors: Cunha Leonardo Ferreira Farias da , Leite Cristina Maria Costa
Published: December 2020

O objetivo geral desta investigação foi analisar a abordagem que professores de Geografia do Ensino Médio, em escolas públicas de Taguatinga, no Distrito Federal, deram aos componentes físico-naturais e aos conteúdos a eles relacionados. Trata-se de uma investigação qualitativa que usou, como instrumentos de produção das informações empíricas, entrevistas semiestruturadas, exercícios de problematização, assim como análises dos planos de ensino. Os resultados revelaram que os componentes físico-naturais, de modo geral, são abordados de forma descritiva, informativa e fragmentária; falta clareza conceitual no tratamento dos temas e dos conteúdos que envolvam os componentes físico-naturais e uma abordagem geográfica desses componentes e, por fim, a formação inicial e continuada dos professores tem um efeito decisivo em sua prática pedagógica, principalmente no que se refere à (re)construção didático-pedagógica desses conteúdos, afetando, destarte, a qualidade profissional docente.
SOCIABILIDADES NAS FAIXAS DE DOMÍNIO FERROVIÁRIO DAS CIDADES DO TRIÂNGULO MINEIRO, MINAS GERAIS, BRASIL
Authors: De Oliveira Lucas Martins
Published: December 2020

As fotografias que se apresenta compõem trabalhos de campo realizados com o objetivo de entender a dinâmica de apropriação social das faixas de domínio ferroviário nas cidades de Uberaba, Uberlândia e Araguari, localizadas na região do Triângulo Mineiro, Minas Gerais, Brasil. Se para muitos habitantes tais espaços são excludentes, “sem dono”, sujeitas à deposição de lixo e entulho e à prática de ilicitudes, para outros é espaço acolhedor, onde é possível se divertir, onde cabe um pomar ou um quintal.Não ignorar a vida cotidiana é o ponto de partida para decifrar as possibilidades de sociabilidade neste espaço público pouco compreendido, as faixas de domínio. Entender os modos de apropriação existentes e possíveis passa por entender as raízes e autenticidades dos habitantes. Interessa a categoria da interação social, conceito fundamental das ciências sociais.São diversas as formas de interação, que aparecem em casos insignificantes, mas que, inseridos de forma abrangente, sustentam a sociedade. Os laços de tais interações são feitos e desfeitos, as heranças e tradições trazidas do campo se misturam com práticas tipicamente urbanas. O que fazem no tempo livre aqueles que habitam os espaços da borda da ferrovia? A análise de campo mostrou moradores com tempo e disposição para desfrutar de uma conversa, produzir alimento, descansar, brincar, interações densas de sociabilidade. Evidentemente, modalidades simples, sem o brilho e a sofisticação das últimas novidades da indústria do lazer.
[ID 52180] FATORES DE RISCO ASSOCIADOS A DOENÇAS CARDIOVASCULARES EM ESTUDANTES UNIVERSITÁRIOS
Authors: Oliveira Silva Raquel , Vasconcelos Leitão Moreira Patrícia , Alves Lopes da Silva Talita Maria , Rodrigues Martins Lins Pamela
Published: December 2020

Objetivo: Identificar os fatores de risco associados à doenças cardiovasculares em estudantes universitários. Metodologia: Trata-se de um estudo transversal realizado com 111 indivíduos com faixa etária entre 20 e 47 anos, numa residência universitária no Município de João Pessoa. Foram coletadas medidas antropométricas e realizada a aferição da pressão arterial. Além da estatística descritiva, foram aplicados os testes do Qui-quadrado de Pearson, para avaliar as associações entre as variáveis categóricas e o teste t de Student, para avaliar as diferenças entre as médias. Resultados: A frequência de hipertensão na amostra foi de 28,83%. A circunferência do pescoço elevada foi positivamente associada ao sexo masculino (p=0,025). Entre as medidas de adiposidade corporal, a obesidade geral, representada pelo índice de massa corporal (p=0,042) e o percentual de gordura corporal (p=0,021) demonstraram maior associação com a hipertensão. Na comparação entre as médias das variáveis antropométricas com a pressão arterial, foi observado que os indivíduos com a pressão arterial alterada também tinham o índice de massa corporal inadequado (p= 0,007), circunferência da cintura (p=0,003), circunferência do pescoço (p=0,014) e relação cintura/estatura (p=0,012), sinalizando risco para doenças cardiovasculares. Conclusão: Dentre os fatores de risco associados à doenças cardiovasculares, foram observados alta frequência de hipertensão, excesso de peso, diâmetro do pescoço elevado no sexo masculino, enquanto, as medidas de adiposidade geral foram associadas ao aumento da pressão arterial.
[ID 52265] AVALIAÇÃO DAS HABILIDADES COGNITIVO-LINGUÍSTICAS DE APRENDIZAGEM EM CRIANÇAS QUE GAGUEJAM
Authors: Dos Santos Araújo Gilcélia , Alves Almeida Larissa Nadjara , Cahino Delgado Isabelle , Barbosa Lima Ivonaldo Leidson
Published: December 2020

Objetivo: Avaliar o desempenho nas habilidades cognitivo-linguísticas de aprendizagem em crianças com e sem gagueira em fase de alfabetização. Metodologia: Estudo de caso-controle, descritivo, transversal e quantitativo, realizado com uma amostra de 20 crianças, de ambos os sexos, em fase de alfabetização, que foram alocadas em dois grupos, na faixa etária de seis a doze anos. O grupo I: formado por dez crianças com gagueira do desenvolvimento persistente e o grupo II: composto por dez crianças sem gagueira. A coleta de dados foi realizada por meio do protocolo de Avaliação das habilidades cognitivo-linguísticas – versão coletiva e individual. A versão coletiva é composta pelas habilidades de escrita, aritmética, processamento auditivo e processamento visual; e a versão individual é composta pelas habilidades de leitura, metalinguística, processamento auditivo, processamento visual e velocidade de processamento. A análise dos dados foi realizada por meio do Teste t-Student, ao nível de significância de 5%. Resultados: Os resultados deste estudo evidenciaram diferença significante, sugerindo maiores dificuldades do grupo que gagueja em relação ao grupo de crianças sem gagueira, nos subtestes de conhecimento do alfabeto (p=0,008), aliteração (p=0,004), rima (p=0,002), segmentação silábica (p=0,002), memória direta de dígitos (p=0,004), repetição de palavras (p=0,039), ritmo (0,002) e memória indireta de dígitos (p=0,002). Conclusão: Crianças que gaguejam possuem dificuldades de aprendizagem, relacionadas as habilidades metalinguísticas e de processamento auditivo.
[ID 52420] TREINAMENTO DOS MÚSCULOS DO ASSOALHO PÉLVICO ASSOCIADO À GAMETERAPIA PARA TRATAMENTO DA INCONTINÊNCIA URINÁRIA DE ESFORÇO
Authors: Faro de Castro Anna Paula , Pinto Veiga Luana Patrícia , De Oliveira Silva Dayse Danielle , Araújo Cardoso Dias Biatriz , Da Silva Dias George Alberto , Feio Carneiro Nunes Érica
Published: December 2020

Objetivo: Avaliar a eficácia do TMAP associado à gameterapia em mulheres com IUE, tendo como variáveis a gravidade, a função dos MAP e o impacto sobre a vida diária. Metodologia: A pesquisa teve aprovação do Comitê de Ética e foi realizada com 10 mulheres incontinentes, de 40 a 77 anos, no período de agosto a outubro de 2017, na Clínica Escola de Fisioterapia da Universidade da Amazônia. Utilizou-se uma ficha de avaliação fisioterapêutica uroginecológica, a escala de impacto sobre a vida diária e como instrumentos de intervenção foram utilizados o Xbox Kinect 360º por 12 sessões. A análise estatística foi realizada por meio do programa GraphPad Prism 5, tendo sido utilizado o teste de Wilcoxon, sendo adotado um nível alfa 5% (p≤0,05) como significância estatística. Resultados: Observou-se que na avaliação da perda ao esforço, ocorreu melhora no pós-tratamento (p=0,01), quanto à severidade e a progressão da perda, a maioria mencionou não existir perda pós-tratamento, porém, sem significância estatística. Na palpação dinâmica, no período pré-tratamento apenas 20% (2/10) das mulheres possuíam força completa, no entanto, na reavaliação essa variável subiu para 80% (8/10), sendo estatisticamente significante (p=0,01), bem como, no endurece (p=0,01), na potência (p=0,007) e no relaxamento pós-contração (p=0,02). Na avaliação pós-aplicação do protocolo, 70% (7/10) das mulheres afirmaram que a incontinência urinaria não mais impactava sobre a vida diária (p=0,007). Conclusão: O tratamento proposto no estudo mostrou-se eficaz para a amostra em questão, na recuperação da continência urinária.
A [ID 52609] A MORTALIDADE POR ASMA EM ADULTOS E IDOSOS NO BRASIL ENTRE 2000 A 2015
Authors: De Sousa Cavalcante Mateus , Luciano Carneiro Alves de Oliveira Bruno
Published: December 2020

Objetivo: Analisar as características da mortalidade por asma em adultos e idosos (≥20 anos de idade) no Brasil. Metodologia: Estudo ecológico com dados de óbitos ocorridos entre 2000 a 2015, disponíveis no Sistema de Informações sobre Mortalidade. Calcularam-se as taxas de mortalidade ajustadas por idade e frequência relativa dos óbitos. Estimou-se a tendência desses óbitos pelo Modelo de Prais-Winsten. Aplicou-se a estatística G* para verificar significativos clusters de Unidade Federada (UF), com similares níveis de mortalidade. Resultados: Os óbitos em adultos representaram 91,0% (n=36.977), destes, 67,5% em idosos. Os óbitos foram mais frequentes nas mulheres, idosos, de baixa escolaridade, de regiões e unidades federativas com pior infraestrutura socioeconômica e de saúde. As Regiões Norte e Nordeste foram as únicas que não apresentaram tendência estatisticamente significante de redução das taxas de mortalidade em ambos os sexos e idades. Os Estados da Região Nordeste apresentaram estatisticamente significantes riscos de morte, segregados em ambos os sexos, em relação ao resto do país. Conclusão: A asma é uma importante causa de mortalidade em adultos e idosos no Brasil. As desigualdades socioeconômicas e assistenciais à saúde estão associadas às diferenças nos riscos de morte observadas.
Mapping Hydromorphic Areas and Drainage Networks in Tropical Riparian Zones using Topographic Attributes
Authors: Chaves Henrique , Montalvao Maria Tereza , Fonseca Maria Rita , Matricardi Eraldo
Published: December 2020

Riparian areas and channel networks are important landscape
compartments, with key hydrological and ecologic functions. Hence,
defining their spatial boundaries is an important step towards
sustainable riparian management. In tropical countries, riparian areas
are rarely mapped, although they represent a crucial component of local
livelihoods and ecosystems. In this study, topographic attributes
generated with a 30m SRTM DEM were used to delineate wet areas and
stream networks of two small catchments in Central Brazil. The
topographic attributes were the local slope, the slope curvature, and
the Topographic Wetness Index-TWI, respectively. Threshold values of the
selected topographic attributes were calibrated in the Santa Maria
catchment, comparing the synthetic wet areas and drainage networks with
corresponding reference (map) features, and validated in the nearby
Santa Maria basin. Drainage network and wet area delineation accuracies
were estimated with multi-criteria and confusion matrix methods. The
drainage network delineation accuracy was 67.2% and 70.7%, and wet
area prediction accuracy was 72.7% and 73.8%, for the Santa Maria and
Gama catchments, respectively. The delineation errors resulted from
model incompleteness, DEM grid size and vertical inaccuracy, and from
cartographic misrepresentation of the reference maps. The method
performed equal or better than other studies in the literature, and
could be used for preliminary mapping of riparian areas of tropical
catchments.
The Importance of HSPA-2 Expression in Laryngeal Squamous Cell Carcinomas
Authors: Ceylan Onur , Arslan Remzi
Published: December 2020

Objective: Laryngeal Squamous Cell Carcinoma (LSCC) has high recurrence,
metastasis and mortality rates, thus determining the markers related to
prognosis and the methods that can be effective in its treatment are
important. Studies have reported that HSPA-2 has an important role in
tumor growth but there is a limited number of studies about LSCC. The
aim of our study was to examine the relationship between HSPA-2
expression and clinicopathological parameters in LSCC. Material and
Methods: HSPA-2 was studied on 57 cases who have been diagnosed with
LSCC in the last 7 years. The connection between HSPA-2 expression and
important prognostic parameters was investigated. Results: In all of the
cases, positive immunoreactivity was determined with HSPA-2. A
significant relationship was determined between the HSPA-2 expression
and important prognostic parameters such as lymphovascular invasion,
lymph nodule metastasis, the primary tumor, the TNM stage, and survival
rates. Conclusion: Our study supports the link between high HSPA-2
expression levels and poor prognostic parameters. Therefore we think
that HSPA-2 can be used as a prognostic marker in laryngeal cancer.
Also, we think that HSPA-2 is important in early diagnosis due to its
increased expression even in LSCC precursor conditions. In addition, we
believe that treatment regimens based on inhibiting HSPA-2 expression in
the early stage of LSCC will be effective.
Dominance distributions for fatigue performance of materials and its application in material selection
Authors: Bai Xin , Zhang Peng , Yang Enna , Duan Qiqiang , Bo Hao , Zhang Zhefeng
Published: December 2020

A new method for the comparison of fatigue performance among different
materials is proposed by using Monte-Carlo technology. The uncertainty
of material’s fatigue property and the diversity of service loads are
respectively described as a reliability index and a probability
distribution. Using fatigue life as the standard measure of fatigue
performance, two kinds of diagrams are developed as the dominance
distributions for fatigue performance of materials. After the
implication in the material selection from two casting alloys, the
results show that the new method can evaluate the fatigue performance
among different materials no matter withsanding constant or variable
amplitude loading, which is very easy to guide the judgment whether the
material has better fatigue performance or not.
Training in pediatric airway endoscopy during a pandemic and beyond
Authors: Leong Albin , Benscoter Dan , Brewington John , Torres-Silva Cherie , Wood Robert
Published: December 2020

The pandemic has had a dramatic and negative impact on opportunities for
training in pediatric airway endoscopy. This commentary discusses ways
in which training programs can address this issue.
The drying kinetics and characteristics of Shrimp dried by conventional methods
Authors: Ersan Ali , Tugrul Nurcan
Published: December 2020

The main purpose of this study was to research the influence of different drying methods on the physical and qualitative properties of dried shrimps. Shrimps were dried with conventional methods at 60, 70 and 80?C between 330 to 210 min and 190 to 110 min, in an oven and vacuum oven respectively. Drying time was shortened with the use of a vacuum pump. The drying kinetics of the shrimp were studied, and effective moisture diffusion and activation energy were calculated for both methods. The Alibas model and the Midilli and Kucuk model provided the best experimental data with a high coefficient of determination (R2) for the oven and vacuum oven techniques, respectively. The final dried products were characterized by investigating the color characteristics, heavy metal content and by carrying out protein analyses. The rehydration ratio was also determined for the dehydrated shrimps. Drying conditions affected the color features so that shrimps dried in ovens and vacuum ovens showed an increase in brightness and yellowness values and a decrease in redness values. The concentration of As, Pb, Cd, Hg, Cu, Zn and Fe in the dried shrimp were within acceptable limits. The protein content of dried shrimp (?85%) is higher than that of undried shrimp (?20%).
Decision-making support for input data in business processes according to former instances
Authors: Pérez Álvarez , Parody Luisa , Gómez-López María , Gasca Rafael , Ceravolo Paolo
Published: December 2020

Business Processes facilitate the execution of a set of activities to achieve the strategic plans of a company. During the execution of a business process model, several decisions can be made that frequently involve the values of the input data of certain activities. The decision regarding the value of these input data concerns not only the correct execution of the business process in terms of consistency, but also the compliance with the strategic plans of the company. Smart decision-support systems provide information by analyzing the process model and the business rules to be satisfied, but other elements, such as the previous temporal variation of the data during the former executed instances of similar processes, can also be employed to guide the input data decisions at instantiation time. Our proposal consists of learning the evolution patterns of the temporal variation of the data values in a process model extracted from previous process instances by applying Constraint Programming techniques. The knowledge obtained is applied in a Decision Support System (DSS) which helps in the maintenance of the alignment of the process execution with the organizational strategic plans, through a framework and a methodology. Finally, to present a proof of concept, the proposal has been applied to a complete case study.
Students’ preferences in selection of computer science and informatics studies: A comprehensive empirical case study
Authors: Savic Milos , Ivanovic Mirjana , Lukovic Ivan , Delibasic Boris , Protic Jelica , Jankovic Dragan
Published: December 2020

A selection of Computer Science, Informatics or similar study programs for academic studies evidently becomes an emerging choice of a vast number of students in recent years. To address some of the open questions, we performed an empirical study based on a survey, with a goal to find out the main motivating factors directing students to select computer science, informatics or similar programs for studying in a much greater extent. The survey was conducted on a sample of 1517 students from five well established, and most traditional faculties of computer science and informatics at three largest university cities in Serbia: Belgrade, Novi Sad, and Nis. The created sample is representative enough to illustrate the current situation and trends common for many similar societies. Our first analysis shows that the main motivating factor to select computer science or informatics study program at all faculties is the students? motivation to study just that topic, while at management faculty it is significantly less important. However, we also noticed that significant number of students wished to study something else but chose computer science and informatics due to possibility of finding jobs easier and of earning higher salaries in industry. The most important influential factors to choose a computer science or informatics major come from family members, and close relatives. The perceived brand and reputation of a faculty also plays a significant role. Students being examined prevalently tend to be satisfied with the faculty they have chosen. However, many of them see themselves leaving the country in a near or far future.
Predicting dropout in online learning environments
Authors: Radovanovic Sandro , Delibasic Boris , Suknovic Milija
Published: December 2020

Online learning environments became popular in recent years. Due to high attrition rates, the problem of student dropouts became of immense importance for course designers, and course makers. In this paper, we utilized lasso and ridge logistic regression to create a prediction model for dropout on the Open University database. We investigated how early dropout can be predicted, and why dropouts occur. To answer the first question, we created models for eight different time frames, ranging from the beginning of the course to the mid-term. There are two results based on two definitions of dropout. Results show that at the beginning AUC of the prediction model is 0.549 and 0.661 and rises to 0.681 and 0.869 at mid-term. By analyzing logistic regression coefficients, we showed that at the beginning of the course demographic features of the student and course description features are the most important variables for dropout prediction, while later student activity gains more importance.
Comparative analysis of the assortment structure of poplar clones I-214 and Pannonia
Authors: Danilovic Milorad , Rakovic Dragan , Isajev Dusan , Antonic Slavica
Published: December 2020

Poplars occupy about 31.4 million ha in the world, while in Serbia poplars
spread over the area of 48.000 ha. The subject of this research are
artificially raised poplar plantations, consisting of poplar clone I-214
(Populus?euramericana (Dode) Guinier cl. I-214) and poplar clone Pannonia
(Populus?euramericana (Dode) Guinier cl. Pannonia). Field activities of
collecting data required for this research were conducted in two phases. The
first phase of data collection included measurement of tree diameter. Also,
the numbering, marking and recording of poplar rows, as well as each poplar
in the row, was conducted. The second phase of data collection was conducted
after the felling of trees that were selected for detailed measurement of
the elements required for theoretical cross cutting. In accordance with the
general principles of cross cutting, as well as the principles of maximum
financial effect, the qualitative partition of trunks into several variants
was performed. The classification of wood assortments was performed on the
basis of SRPS wood standards. The share of technical wood for veneer (F and
L class) in the analyzed poplar trees clone I-214 is 47.54% of the total
volume of wood assortments. When it comes to the clone Pannonia, logs for
cutting (quality class II), have the greatest share in total volume of wood
assortments with 44.08. There is no statistically significant difference
between the total volume and the value of the assortments of the two
analyzed poplar clones, except when it comes to assortments for chemical
exploitation where statistical differences exist.
Evaluation of technological wastewater treatment solutions for the settlements within the Backo Podunavlje biosphere reserve
Authors: Grabic Jasna , Korac Nikola , Srdjevic Zorica , Benka Pavel
Published: December 2020

This paper presents the results of a multidisciplinary analysis and the
evaluation of a suitable technological solution for wastewater treatment for
the villages Backi Breg and Kolut, belonging to the Backo Podunavlje
Biosphere Reserve. The research was structured as a three part methodology.
It encompassed: 1) citizens? habits on wastewater production - investigated
by analysing septic tank waste water quality; 2) stakeholders? opinion on
the most important features which a wastewater treatment facility (WWTF) has
to fulfil-analysed by interviewing stakeholders and the application of
multi-criteria decision support tool and 3) finding the most suitable
location for future WWTF by applying geographic information systems (GIS).
The results revealed that sampled wastewaters were in range for municipal
wastewaters. The decision-making model, based on simple additive weighting
(SAW), was defined to evaluate two possible solutions (constructed wetland
and sequencing batch reactor) across six criteria. The model showed that a
constructed wetland system is more adequate, in comparison to the sequencing
batch reactor. Finally, by overlapping multiple GIS map layers the most
suitable area for setting up the WWTF was found. The proposed methodology is
especially suitable for application in biosphere reserves, since the link
social attitude - natural resources exploitation - nature conservation is
the key element for achieving sustainability.
Analysis of medicinal plants within eight departments in the area of the Suma Kosutnjak Natural Monument
Authors: Jokanovic Dusan , Indjic Predrag , Petrovic Jovana , Devetakovic Jovana
Published: December 2020

In this paper, determination of medicinal plants was performed within eight
departments in the area of the Suma Kosutnjak Natural Monument. Overall, a
total of 101 medicinal plants were established in the whole research area.
The identification of medicinal plants was conducted according to
appropriate references. In addition to this, taxonomy analysis, definining
of floral elements and finally determining of life forms for the recorded
species were also performed. As for the taxonomy analysis, the greatest
abundance in the whole research area was found for families Lamiaceae (12
representatives) and Rosaceae (10 representatives), while all other families
are not so much present. There are overall 27 floral elements in the whole
research area and among them, most of them belong to submideuropean (18
individuals) and european (16 individuals) floral elements, while the share
of all other floral elements is much smaller. As for the life forms, the
most dominant are hemicryptophytes (45 representatives), then phanerophytes
(23 representatives) and finally therophytes (10 representatives).
Differences between some departments have been established just in terms of
the number of medicinal plants.
Soil contamination with potentially toxic elements in the municipality of Bor
Authors: Tosic Sonja , Mrvic Vesna , Jaramaz Darko , Saljnikov Elmira
Published: December 2020

In the territory of the municipality of Bor, 69 samples were taken from
agricultural lands at a depth of 0-30 cm, in which the total content of
arsenic, chromium, copper, nickel, lead, zinc, and cobalt was determined.
The study area is dominated by dystric cambisol, vertisol, calcomelanosol,
and eutric cambisol. The results show that the main pollutants are As and
Cu, in 18.8% and 30.4% above the MDK. Also, the calculation method Median +
2MAD determined the background limits of PTES in the soil, then the
environmental risk index and pollution index, which indicates the degree of
moderate pollution with arsenic in 4.3%, samples, copper in 10.2% of
samples, and heavy pollution with copper in 1.4% of the samples. PCA
analysis and correlation highlighted the component with high values of As,
Cu, Pb, which indicate anthropogenic activities, and the component with high
values of Ni, Co, and Cr, which indicate the background. The zone with the
potentially harmful impact of As and Cu in the wider vicinity of Bor,
Ostrelj - Slatina - Brestovac presentation the subject of continuous
monitoring with the aim of implementing land repair and remediation
measures.
Roman sarcophagus from Titel
Authors: Djuric Bojan
Published: December 2020

The unusual Roman sarcophagus of green volcaniclastic rock that was found in
Titel, a small town in Vojvodina (SRB), and is now kept in the Muzeul
National al Banatului, in Timi?oara (RO), caused considerable unease among
scholars in the past as it could not be convincingly connected with any of
the productions in Pannonia and Moesia Superior. Only Silvio Ferri, albeit a
long time ago, correctly identified its connection with the sarcophagus
production in Sirmium and with the sarcophagus of Asclepiodota in
particular, made of Dardagani limestone. Sarcophagi of volcaniclastic rock
have only been recorded in the region of Srem and its immediate vicinity,
and were all produced in Sirmium. The material most likely arrived there
from the south, quarried near the village of Rajici, ca 25 km west of
Domavia, in the valley of the River Drina. The structure and decoration of
the sarcophagus from Titel reveal it as essentially the type produced by the
workshops at Salona using models from Prokonessos. Having said that, its
decorative details reveal a more complex picture. The decoration of narrow
strips of plant motifs indicates a close relationship between the
sarcophagus workshops at Sirmium and the workshops active in the middle and
upper valley of the River Drina with its tributaries, with the centre at
Skelani (municipium Malvesiatium), which, in turn, had close ties with the
Salona production. The use of the Norico-Pannonian volute of Type 6 (after
Pochmarski) on the inscription panel frame of the sarcophagus from Titel
shows another area of influence - the travertine sarcophagus production of
Aquincum - on the appearance of the sarcophagi from Sirmium that freely use
these motifs (including Type 7) to form the frames of the inscription and
figural panels. Available evidence clearly shows that the sarcophagus from
Titel can be attributed to the Sirmium sarcophagus production of the 3rd
century, more precisely its second half.
Integration of pure copper to optimize heat dissipation in injection mould inserts using laser metal deposition
Authors: Polenz Stefan , Kolbe Christian , Bittner Florian , López Elena , Brückner Frank , Leyens Christoph
Published: December 2020

Conventional infrared lasers (1070 nm) are not ideal for processing materials such as copper or gold. The reason for this is the corresponding high reflectivity of the aforementioned materials for infrared radiation. Since 2017, so-called “green lasers” {wavelengths around 500 nm [Kaliudis, see https://www.trumpf.com/de_DE/magazin/gruene-welle-fuers-kupferschweissen/ for “Grüne Welle fürs Kupferschweißen, TRUMPF Media Relations,” Press Release (2017)]} are available for welding processes and additive manufacturing technologies, viz., laser powder bed fusion (LPBF) and laser metal deposition (LMD). These lasers are specially designed for the processing of highly reflective materials and have been recently used for the fabrication of specimens from pure copper. Due to process reasons, only one alloy is typically used for the manufacturing of components if powder bed based methods (LPBF) are applied. For many components, however, it is the combination of different materials (differences in thermophysical properties) that leads to an improvement in the component performance. The LMD process, in contrast to LPBF, can be adjusted with relative low efforts for the processing of two or more different materials. This offers new possibilities for the functionalization of parts that are already fabricated through a combination of subtractive and additive technologies (hybrid manufacturing). A mould insert for polymer injection molding will be presented in this contribution. It was produced by using a combination of different processes (subtractive, additive) and materials (pure copper, steel 1.2764).2–5 For a conventionally manufactured basic body (1.2764), copper cores were integrated in the corner areas by means of LMD. The cladding of the cores with 1.2764 was carried out with regard to the basic body and guaranteed dimensional accuracy for further processing. In order to improve the flow of coolant to the copper cores in the later application, the upper part of the mould insert with conformal cooling channels was manufactured using LPBF. The entire tool insert demonstrator was then finished and case-hardened. Initial tests under real conditions on the overall component are intended to prove full functionality. Simultaneously, we discuss the added value of the hybrid manufacturing approach that was funded by the Federal Ministry of Education and Research (BMBF) in Germany as part of the AGENT-3D project IMProVe.
Just how (in)efficient is my laser system? Identifying opportunities for theoretical and auxiliary energy optimization
Authors: Goffin Nicholas , Jones Lewis C. R. , Tyrer John R. , Woolley Elliot
Published: December 2020

In manufacturing, there is increasing recognition of the need to increase energy efficiency, both to reduce process cost and improve carbon footprint. In order to achieve this, it is necessary to understand how manufacturing systems use energy directly and indirectly. These types of analyses have been carried out at the process level for traditional machining processes, as well as at the factory level to understand macroenergy flows and bottlenecks. Other researchers have accomplished considerable energy optimization work for laser processing. However, the emphasis of this work has been on the optimization of the laser–material interaction. This focus has overlooked the whole system viewpoint and the significance of supporting equipment. Laser welding, using a 300 W fiber laser, was chosen as the subject for this study; first, due to its ubiquity in many high-value manufacturing industries and second due to its potential as a gateway into other manufacturing processes, such as directed energy deposition and additive manufacturing. In this paper, the initial work was to produce a framework for categorizing the process states and subsystems found in a standard or generic laser machine tool. An electrical energy meter was used to measure the energy consumption for individual subsystems when creating autogenous weld tracks in 316L stainless steel. Analysis of these data showed that the laser is only 18% of the total power consumption, the most significant being the water-cooling subsystem (37%). Reported here is a complete analysis of laser welding energy efficiency at a system level. This primary analysis of current equipment typical energy consumption can be used to identify future strategies for energy efficiency improvements beyond the direct laser interaction. By focusing on the most energy-inefficient parts of the system, the greatest potential for improvements to the carbon footprint of laser processing can be quantified.
Applying optical coherence tomography for weld depth monitoring in remote laser welding of automotive battery tab connectors
Authors: Sokolov Mikhail , Franciosa Pasquale , Sun Tianzhu , Ceglarek Dariusz , Dimatteo Vincenzo , Ascari Alessandro , Fortunato Alessandro , Nagel Falk
Published: December 2020

This paper addresses in-process monitoring of weld penetration depth (WPD) during remote laser welding of battery tab connectors using optical coherence tomography (OCT). The research aims at studying the impact of welding process parameters on the accuracy of WPD measurements. In general, the highest measurement accuracy is achievable by positioning the OCT measuring beam toward the bottom of the keyhole. However, finding and maintaining the alignment between the OCT measuring beam and the bottom of the keyhole is a challenging task because of the dynamic changes in the size and shape of the keyhole itself. The paper addresses the above challenge by (1) developing welding process parameters for the Al-Cu thin foil lap joint (Al 1050 foil 450 μm and Ni-plated Cu foil 300 μm) using a novel adjustable ring mode (ARM) laser and (2) integrating OCT technology with two beams: one targeting the bottom of the keyhole and another as a reference to the part surface (TwinTec technology). The methodology is underpinned by the “Keyhole Mapping” approach, which helps one to identify the optimal placement of the OCT measuring beam with considerations to both measurement accuracy and stability of the keyhole. Findings indicated that welding with the ARM laser results in a more stable process, reduces fluctuations of the keyhole opening, and, therefore, helps one to improve the measurement accuracy by a factor of 50% (from the average error of 0.22 mm to 0.11 mm). Results further identified that the feasible operating window of the OCT measuring beam, corresponding to the highest measurement accuracy, is below 20 μm in length.
ALGORITHM FOR A FORMATION OF A SMALL TRAINING SET USING A MULTILAYER PERCEPTRON FOR A PRIORI ESTIMATES
Authors:   Moscow Institute of Physics and Technology, Seleznov Mykhailo
Published: December 2020

The paper proposes an algorithm for the formation of a small training set, which ensures a reasonable quality of a surrogate machine learning model trained using this set. The algorithm uses multilayer perceptron to estimate heuristics and select the best next sample for the inclusion in a set. The paper tests the algorithm proposed applying it to the problem of deformation and breaking of a thin thread under the action of a transverse load pulse on it. The possibility to generalize the approach and apply it to building surrogate machine learning models for other physical problems is discussed.
TWO-DIMENSIONAL SPLITTING SCHEMES FOR HYPERBOLIC EQUATIONS
Authors:   Don State Technical University, Sukhinov Alexander
Published: December 2020

The article considers splitting schemes in geometric directions that approximate the initial-boundary value problem for p-dimensional hyperbolic equation by chain of two-dimensional-one-dimensional problems. Two ways of constructing splitting schemes are considered with an operator factorized on the upper layer, algebraically equivalent to the alternating direction scheme, and additive schemes of total approximation. For the first scheme, the restrictions on the shape of the region G at p=3 can be weakened in comparison with schemes of alternating directions, which are a chain of three-point problems on the upper time layer, the region can be a connected union of cylindrical regions with generators parallel to the axis OX3. In the second case, for a three-dimensional equation of hyperbolic type, an additive scheme is constructed, which is a chain «two-dimensional problem – one-dimensional problem» and approximates the original problem in a summary sense (at integer time steps). For the numerical implementation of the constructed schemes – the numerical solution of two-dimensional elliptic problems – one can use fast direct methods based on the Fourier algorithm, cyclic reduction methods for three-point vector equations, combinations of these methods, and other methods. The proposed two-dimensional splitting schemes in a number of cases turn out to be more economical in terms of total time expenditures, including the time for performing computations and exchanges of information between processors, compared to traditional splitting schemes based on the use of three-point difference problems for multiprocessor computing systems, with different structures of connections between processors type «ruler», «matrix», «cube», with universal switching.
KONTRIBUSI LATIHAN HAND GRIP DAN LATIHAN BACK-UP TERHADAP SERVIS SLICE PADA ATLET PUTRA KOMUNITAS TENIS LAPANGAN UNIMED
Authors: Tarihoran Debora , Mahmuddin Mahmuddin
Published: December 2020

Penelitian ini bertujuan untuk mengetahui kontribusi latihan hand grip dan back up terhadap servis slice dalam permainan tenis. Adapun sampel penelitian ini berjumlah 6 orang atlet putra diperoleh dengan teknik purposive sampling. Instrumen yang digunakan dalam penelitian ini adalah grip strength dynamometer untuk kekuatan genggaman, trunk and neck flexibility test untuk kelentukan, serve test untuk servis slice. Hasil analisis statistik latihan hand grip terhadap servis slice diperoleh Fhitung 0.151 dan Ftabel (4,5) sebesar 5.19. Karena Fhitung < Ftabel (0.151<5.9). Sedangkan nilai Sig >α (0.717 > 0.05) maka dapat disimpulkan bahwa tidak terdapat kontribusi yang signifikan dari latihan hand grip terhadap servis slice. Hasil analisis statistik latihan back-up terhadap servis slice diperoleh Fhitung 0.176 dan Ftabel (4,5) sebesar 5.19. Karena Fhitung < Ftabel (0.176<5.19). Sedangkan nilai Sig >α (0.697 > 0.05) maka dapat disimpulkan bahwa tidak terdapat kontribusi yang signifikan dari latihan back-up terhadap servis slice. Hasil analisis statistik latihan hand grip dan latihan back-up terhadap servis slice diperoleh F = 0.069 dan nilai Sig. 0.935. Uji keberartian persamaan regresi dapat dilakukan dengan uji F dan juga Sig. Sehingga dari hasil perhitungan diperoleh Fhitung 0.069 dan Ftabel (3,5) sebesar 5.41. Karena Fhitung < Ftabel (0.176<5.41). Sedangkan nilai Sig >α (0.935 > 0.05) maka dapat disimpulkan bahwa tidak terdapat kontribusi yang signifikan dari latihan hand grip dan latihan back-up terhadap servis slice.
PENGEMBANGAN VARIASI PEMBELAJARAN LOMPAT JAUH PADA MAHASISWA PENDIDIKAN KEPELATIHAN OLAHRAGA FIK UNIMED
Authors: Siregar Yan Indra , Situmeang Rahman , Nasution Muhammad Faisal Ansari
Published: December 2020

Penelitian ini bertujuan untuk mengembangkan pembelajaran atletik nomor lompat jauh di jurusan pendidikan kepelatihan olahraga FIK Unimed melalui beragam variasi pembelajaran. Adapun metode yang digunakan pada penelitian ini adalah penelitian pengembangan. Pada penelitian ini terdapat 8 variasi pembelajaran lompat jauh yang dirancang untuk meningkatkan hasil belajar. Delapan model yang telah disusun terlebih dahulu divalidasi oleh 5 orang ahli dibidang olahraga yaitu 2 orang merupakan pelatih lompat jauh dan 3 orang merupakan akademisi olahraga. Uji kelompok kecil menggunakan 25 orang mahasiswa serta uji coba kelompok besar menggunakan 50 orang mahasiswa. Pada tahap uji coba kelompok kecil, peneliti mengumpulkan data berupa angket yang berisi tentang tanggapan sampel terhadap pemakaian produk penelitian. Dari angket yang dibagikan diperoleh data hasil 89.33% menginginkan produk ini. Adapun Output yang dihasilkan dari penelitian ini adalah berupa buku yang dapat dijadikan pedoman pembelajaran secara berkesinambungan. Melihat data hasil penelitian besar harapan peneliti bahwa buku ini dapat meningkatkan minat belajar mahasiswa pada bidang atletik khususnya lompat jauh mahasiswa jurusan pendidikan kepelatihan olahraga.
PERBEDAAN PENGARUH METODE PEMBELAJARAN DAN KECEPATAN REAKSI TERHADAP KEMAMPUAN MENERIMA SERVIS SEPAKTAKRAW PADA MAHASISWA PKO FIK UNIMED
Authors: Wiyaka Ibrahim , Daulay Dicky Edwar , Adikahriani Adikahriani
Published: December 2020

Tujuan penelitian ini untuk mengetahui pengaruh antara metode pembelajaran dan kecepatan reaksi terhadap kemampuan menerima servis pada mahasiswa PKO FIK Unimed tahun 2020. Penelitian ini dilatarbelakangi oleh banyaknya mahasiswa tidak dapat mengembalikan bola servis disebabkan kemampuan menerima bola dan kecepatan reaksi untuk bergerak menjemput bola kurang baik, sehingga tidak ada serangan balik dan menjadikan permainan tidak menarik serta cenderung mengalami kekalahan. Untuk menjadikan permainan menarik maka mahasiswa harus dilatih menerima bola servis dan kecepatan reaksi ditingkatkan. Penelitian ini dilakukan dengan menggunakan metode eksperimen. Metode pembelajaran yang digunakan yaitu bola dilempar dan bola dipukul pakai raket. Adapun desain penelitian dengan faktorial 2 x 2. Populasi penelitian ini adalah seluruh mahasiswa PKO FIK Unimed yang ikut mata kuliah sepaktakraw lanjutan sebanyak 40 orang. Adapun yang menjadi sampel sebanyak 30 orang yang diperoleh dengan teknik purposive sampling. Instrument penelitian menggunakan tes menerima servis dan tes kecepatan reaksi. Teknik analisis data menggunakan analisis statistik sedangkan perhitungannya menggunakan SPSS. Adapun hasil penelitian sebagai berikut: 1) Terdapat perbedaan pengaruh metode pembelajaran bola dilempar dan bola dilempar dipukul raket terhadap kemampuan menerima servis sepaktakraw pada mahasiswa PKO FIK Unimed, 2). Terdapat perbedaan pengaruh antara kecepatan reaksi tinggi dan kecepatan reaksi rendah terhadap kemampuan menerima servis sepaktaraw pada mahasiswa PKO FIK Unimed, 3). Terdapat interaksi antara metode pembelajaran dengan kecepatan reaksi pada mahasiswa PKO FIK Unimed.
MENINGKATKAN KEMAMPUAN MENGENAL ANGKA 1-10 DENGAN MEDIA GAMBAR
Authors: Khairiah Dina , Dalimunthe Efrida Mandasari , Nasution Ika Nuraini
Published: December 2020

Penelitian ini bertujuan untuk meningkatkan kemampuan mengenal angka 1-10 dengan media gambar di kelas 1 B SD Sihitang. Kemampuan mengenal angka meliputi menyebut angka, menjodohkan angka, dengan gambar dan menulis angka. Jenis penelitian ini adalah penelitian kualitatif yang dilakukan secara kolaboratif dengan tinjauan pustaka. Subyek penelitian adalah anak kelas 1 B yang berjumlah 15 anak yang terdiri dari 10 anak laki-laki dan 5 anak perempuan. Metode pengumpulan data yang digunakan dalam penelitian ini adalah observasi dan dokumentasi. Teknik analisis data yang digunakan adalah deskriptif kuantitatif. Berdasarkan hasil penelitian dapat disimpulkan bahwa media gambar dapat meningkatkan kemampuan anak dalam mengenal angka 1-10 dengan cara (1) memberi penjelasan untuk gambar dan kemiripannya dengan angka 1-10, (2) melakukan permainan dengan gambar untuk menguatkan ingatan antusiasme anak, dan (3) melakukan berbagai variasi dalam setiap siklus agar anak tidak bosan.
Review of the Monograph by R.G. Ardashev, N.N. Kitaev
Authors: Azarov Vladimir A. , Revenko Natalya I.
Published: December 2020

Introduction. The paper reflects the results of reviewing the monograph by R.G. Ardashev and N.N. Kitaev “Post-Criminal Suicide of Murderers: Forensic Support of Investigation” (Ulan-Ude, The Publishing House of Buryat State University, 2020. 216 p.). Results. The authors analyzed and confirmed the relevance and scientific novelty of the proposed methodology for investigating murders associated with subsequent suicide of the criminal, typical investigative situations depending on the time of post-criminal suicide. Typical investigative versions and algorithms of the investigator's actions for their verification, including a set of investigative and other measures, are highlighted. The article analyzes the tactical features of conducting an examination of the scene of an accident and interrogation, as well as relevant forensic examinations, and indicates the need to use various methods of pathological, anatomical, and anthropological research. The review gives a high assessment of the practical significance of the monographic research, which contains appropriate information and methodological support for the investigation of crimes of this category.