bluuebunny/crossref_metadata_2025 huggingface dataset:
The Effectof Organizational Climate and Compensation on Employee Job Satisfaction in The Social Service of Gorontalo District
Authors: Junita Claudia Pahrun  , Hapsawati Taan  , Amrain Mustafa
Published: April 2021

The objectives of this study are: 1) to examine the influence of organizational climate on job satisfaction of the employees of the Gorontalo District Social Service; 2) to examine the effect of compensation on job satisfaction of Gorontalo District Social Service staff; 3) to test the effect of organizational climate and compensation simultaneously on job satisfaction of employees of the Gorontalo District Social Service.

This study uses a descriptive research approach and explanatory research methods. Explanatory method is research that proves the existence of cause and effect and a relationship that affects or is influenced by two or more variables under study. Research quantitative research which is based on the philosophy of positivism, is used to examine specific populations or samples, data collection using research instruments, quantitative/statistical data analysis, with the aim of testing predetermined hypotheses. The research was conducted at the Gorontalo District Social Service and was carried out from August to December 2020 with a total sample of 51 people.

Based on the results of data processing, the conclusions are formulated, namely: 1) there is a positive and real influence of organizational climate on employee job satisfaction at the Gorontalo District Social Service, which means that the higher the organizational climate, the higher the employee job satisfaction; 2) there is a positive and real effect of compensation on job satisfaction of employees at the Gorontalo District Social Service, which means that the better the compensation, the higher the job satisfaction of the employees; 3) there is a positive and real influence simultaneously between organizational climate and compensation on employee job satisfaction at the Gorontalo District Social Service. This means that the higher the organizational climate and the better the compensation, the higher the employee's job satisfaction.
THE ROLES OF ARBUSCULAR MYCORRHIZAE IN SUPPORTING THE MANGROVE GROWTH
Authors: Agusrianto Yusuf
Published: April 2021

The current study aims to determinate the potential of Arbuscular mycorrhizae in supporting the mangrove growth, the role of Arbuscular mycorrhizae on the improvement of mangrove growth in terms of its colonization level with the mangrove roots, the mangrove ability of Arbuscular mycorrhizae in the way of supporting the rehabilitation of mangroves, and giving the recommendation to the local government related to the potential of mycorrhizal fungi in rehabilitating the degraded magrove areas living in the coastal areas of Kwandang, North Gorontalo regency.

Moreover, this study used a descriptive qualitative analysis method using ex-post-facto approach. To collect the data, it used a pruposive sampling on rhizosfer and mangrove roots in order to observe the spore density, the diversity and the mycorrhizal colonization.

The results of this study show that the ability of Arbuscular mycorrhizae in supporting the mangrove growth is categorized in the high level. It can be seen from the spora density. On average in research location, the number of the spores that were successfully isolated is 42 spores/ 100 grams of soil.  Arbuscular mycorrhizae has a role in the way of increasing the mangrove growth. This can be seen from the high percentage of colonization with mangrove roots whereas 57,87%.
Bacteria Identification In Traditional Sauce (Sambal) At The Restaurants Nearby The Traditional Markei Of Gorontalo City
Authors: Ana Pepiana  , Laksmyn Kadir  , Agusrianto Yusuf
Published: April 2021

The unsafe food will cause the health problems in the community. Sambal which is known as the traditional sauce is a sauce made from chilies that are crushed until the water content comes out, giving it a spicy taste. Furthermore, Sambal is processed in a simple way so that it can leac to the contamination of microorganisms such as Coliform bacteria contamination. This study aims to determine the presence of Coliform bacteria contamination in Sambal at the supermarket nearby the traditional market in Gorontalo City. This research is a descriptive study using a qualitative approach. It examines the existence of Coliform bacteria using the Most Probable Number (MPN) method. The population in this study were 14 samples with the sampling technique by accidental sampling. Coliform bacteria examination results show that Sambal sample is found with positive results contaminated with Coliform bacteria, namely 11 samples with a percentage of 78.6% and negative results of 3 samples with a percentage of 21.4%. Based on the results, it can be concluded that a positive result was found consisting of 1 sample of coliform fekal bacteria, in this case the bakteri Escherchia coli. bacteria, and 10 samples from the non-fecal coliform bacteria.
Storage Optimization using Adaptive Thresholding Motion Detection
Authors: Atif M. , Khand Z. H. , Khan S. , Akhtar F. , Rajput A.
Published: April 2021

Data storage is always an issue, especially for video data from CCTV cameras that require huge amounts of storage. Moreover, monitoring past events is a laborious task. This paper proposes a motion detection method that requires fewer calculations and reduces the required data storage up to 70%, as it stores only the informative frames, enabling the security personnel to retrieve the required information more quickly. The proposed method utilized a histogram-based adaptive threshold for motion detection, and therefore it can work in variable luminance conditions. The proposed method can be applied to streamed frames of any CCTV camera to efficiently store and retrieve informative frames.
The Effect of Sisal Juice Extract Admixture on Compressive and Flexural Strength of Cement Concrete
Authors: Eloget M. O. , Abuodha S. O. , Winja M. M. O.
Published: April 2021

The characteristics of concrete are influenced by the ratio of water to cementitious materials (w/c) used in the mixture. An increase in paste quality will yield higher compressive and flexural strength, lower permeability, increased resistance to weathering, improve the bond between concrete and reinforcement, reduced volume change from drying and wetting, and reduced shrinkage cracking tendencies. Admixtures are used to improve the properties of concrete or mortar. The current study investigates the effect of Sisal Juice Extract (SJE) as an admixture on concrete durability. SJE contains unrefined minerals which can be used as organic retarders to increase the rate of strength development at an early age. A total of 84 concrete cubes were produced in 7 sets of 12 samples each. One set was the control mix which had zero SJE content. The remaining sets had varying dosages of SJ namely 5%, 10%, 15%, 20%, 25%, and 30%. Twelve beam specimens were also cast and subjected to the three-point flexural test. To establish the effect on strength of concrete, compressive strength was tested at 7, 14, 28, and 56 days while flexural strength was tested at 28 days. The highest compressive strength was achieved at 5% dosage beyond which a decrease in strength occurred for all the higher dosages.
Early Detection of Parkinson’s and Alzheimer’s Diseases using the VOT_Mean Feature
Authors: Kehili A. , Dabbabi Κ. , Cherif A.
Published: April 2021

Alzheimer’s (AD) and Parkinson’s diseases (PD) are tw of the most common neurological diseases in the world. Several studies have been conducted on the identification of these diseases using speech and laryngeal disorders. Those symptoms can appear even at the early stages of AD and PD, but not in very specific and prominent ways. Voice Onset Time (VOT) is an acoustic specification of the stopping consonant that is commonly discussed in studies of phonetic perception. In this study, the VOT_Mean feature was explored to identify AD and PD early using /pa/, /ka/, and /ta/ syllables for the diadochokinetic task (DDK). VOT_Mean was calculated as the average of the first and the second VOT values (VOT_1 and VOT_2), corresponding to the second and the penultimate VOT measurement cycles. Experimental tests were performed on Tunisian Arabic and Spanish databases for the early detection of AD and PD respectively. The results showed a very high significance of VOT_Mean on the early detection of AD and PD. Moreover, the best results were achieved using the XGBoost (XGBT) algorithm as a classifier on the VOT_Mean feature.
Stability of the Data-Model Fit over Increasing Levels of Factorial Invariance for Different Features of Design in Factor Analysis
Authors: Almaleki D.
Published: April 2021

The aim of this study is to provide an empirical evaluation of the influence of different aspects of design in the context of factor analysis in terms of model stability. The overall model stability of factor solutions was evaluated by the examination of the order for testing three levels of Measurement Invariance (MIV) starting with configural invariance (model 0). Model testing was evaluated by the Chi-square difference test (Δx2) between two groups, and Root Mean Square Error of Approximation (RMSEA), Comparative Fit Index (CFI), and Tucker-Lewis Index (TLI). Factorial invariance results revealed that the stability of the models was varying over increasing levels of measurement as a function of Variable-To-Factor (VTF) ratio, Subject-To-Variable (STV) ratio, and their interactions. There were invariant factor loadings and invariant intercepts among the groups indicating that measurement invariance was achieved. For VTF ratios 4:1, 7:1, and 10:1, the models started to show stability over the levels of measurement when the STV ratio was 4:1. Yet, the frequency of stability models over 1000 replications increased (from 77% to 91%) as the STV ratio increased. The models showed more stability at or above 32:1 STV.
Predicting Flux Rates against Pressure via Solution-Diffusion in Reverse Osmosis Membranes
Authors: Maddah H. A.
Published: April 2021

This paper suggests a new method of predicting flux values at Reverse Osmosis (RO) desalination plants. The solution-diffusion model is utilized to determine the osmotic pressure drops for seawater sources. The same technique was applied to the groundwater source at the Abqaiq plant (500 RO plant) to calculate the osmotic pressure. The calculated osmotic pressures were utilized to determine the appropriate flux rates and membrane resistances of different BWRO Toray membranes and a performance comparison between various membranes has been established. The model results confirm an inverse relationship between membrane thickness and water flux rate. Also, a proportional linear relation between the overall water flux and the applied pressure is identified. Higher flux rates and lower salinity indicate lower membrane resistance yielding higher production. The modeled data predict that BWRO Toray TM720D-440 with an 8" membrane is the optimal choice for treating waters from the three water sources at the Abqaiq plant.
A Novel Modeling and Control Design of the Current-Fed Dual Active Bridge Converter under DPDPS Modulation
Authors: Vu P. , Anh D. T. , Chinh H. D.
Published: April 2021

This paper proposes a novel control design for a Current-Fed Dual Active Bridge (CFDAB) converter in boost mode. The Double PWM plus Double Phase Shifted (DPDPS) modulation is applied to the converter due to its considerable merits. A small-signal model is developed to control the output voltage stably in boost mode. Simulations of the control design for the CFDAB converter were conducted to verify the proposed model. The results show that the system can achieve high performance, not only in the dynamic response but also in the steady-state.
DyTE: An Effective Routing Protocol for VANET in Urban Scenarios
Authors: Kazi A. K. , Khan S. M.
Published: April 2021

A Vehicular Ad-hoc Network (VANET) is a subclass of wireless ad-hoc networks, widely used in on-road vehicles and roadside equipment, having applications in various areas including passenger safety, smart traffic solutions, and connectivity on vehicles The VANET is the backbone of the Intelligent Transport System (ITS) that establishes connectivity between vehicles through a wireless medium. When it comes to the communication between high-speed vehicles there is the challenge of dynamic mobility. In order to provide a higher Packet Delivery Ratio (PDR) and increase the throughput, a new routing protocol called Dynamic Trilateral Enrolment (DyTE) is introduced which chooses a dynamic trilateral zone to find the destination vehicle by allowing only relevant nodes to participate in the communication process using the location coordinates of source and destination nodes. The proposed routing protocol is compared with Ad-hoc On-demand Distance Vector (AODV), Ad-hoc On-demand Multipath Distance Vector (AOMDV), and Dynamic Source Routing (DSR), and the results show remarkable improvement in reducing the Network Routing Load (NRL) and increasing the PDR and throughput of the network. DyTE has performed more efficiently in terms of PDR (23% approximately), throughput (26% approximately) and drastically minimized the NRL by a factor of almost 3.
Individual Tree Crown Detection Using UAV Orthomosaic
Authors: Tahar K. N. , Asmadin M. A. , Sulaiman S. A. H. , Khalid N. , Idris A. N. , Razali M. H.
Published: April 2021

Unmanned Aerial Vehicles (UAVs) are increasingly used in forestry as they are economical and flexible. This study aims to present the advantages of the drone photogrammetry method in collecting individual tree crowns, as individual tree crown detection could deliver essential ecological and economic information. The referred accuracy for individual tree crown extraction is 79.2%. Only crowns that were clearly visible were selected and manually delineated on the image because the distribution of the true crown size is significantly different from the segmented crowns. The aim of this study is to investigate UAVs orthomosaics in individual tree crown detection. The objectives of this study are to produce the orthomosaic of tree crown extraction mapping using the Pix4D software and analyze the tree crowns using tree crown delineation and the OBIA algorithm. Data processing involves the processing of aerial images using Pix4Dmapper. Automatic tree crown detection involves a tree crown delineation algorithm and OBIA operations to process the tree crown extraction. The crown delineation algorithm and OBIA algorithm operation will be compared to the actual tree crown measurement in terms of diameter and area. The tree crown delineation method obtained a 0.347m mean diameter difference from the actual tree crown diameter, while the OBIA approach obtained 4.98m. The tree crown delineation method obtained 97.26% of the actual tree crown area, while OBIA obtained 91.74%.
Backstepping Terminal Sliding Mode MPPT Controller for Photovoltaic Systems
Authors: Behih K. , Attoui H.
Published: April 2021

In this paper, a new Maximum Power Point Tracking (MPPT) control for a Photovoltaic (PV) system is developed based on both backstepping and terminal sliding mode approaches. This system is composed of a solar array, a DC/DC boost converter, an MPPT controller, and an output load. The Backstepping Terminal Sliding Mode Controller (BTSMC) is used via a DC-DC boost converter to achieve maximum power output. The stability of the closed-loop system is guaranteed using the Lyapunov method. This novel approach provides good transient response, low tracking error, and very fast reaction against solar radiation and PV cell temperature variations. Furthermore, chattering, which constitutes the main disadvantage of the classic sliding mode technique is eliminated. To show the effectiveness and robustness of the proposed control, different simulations under different atmospheric conditions are conducted in Matlab/Simulink.
Improving the Recognition Performance of Lip Reading Using the Concatenated Three Sequence Keyframe Image Technique
Authors: Poomhiran L. , Meesad P. , Nuanmeesri S.
Published: April 2021

This paper proposes a lip reading method based on convolutional neural networks applied to Concatenated Three Sequence Keyframe Image (C3-SKI), consisting of (a) the Start-Lip Image (SLI), (b) the Middle-Lip Image (MLI), and (c) the End-Lip Image (ELI) which is the end of the pronunciation of that syllable. The lip area’s image dimensions were reduced to 32×32 pixels per image frame and three keyframes concatenate together were used to represent one syllable with a dimension of 96×32 pixels for visual speech recognition. Every three concatenated keyframes representing any syllable are selected based on the relative maximum and relative minimum related to the open lip’s width and height. The evaluation results of the model’s effectiveness, showed accuracy, validation accuracy, loss, and validation loss values at 95.06%, 86.03%, 4.61%, and 9.04% respectively, for the THDigits dataset. The C3-SKI technique was also applied to the AVDigits dataset, showing 85.62% accuracy. In conclusion, the C3-SKI technique could be applied to perform lip reading recognition.
Development of an Automatic Contactless Thermometer Alert System Based on GPS and Population Density
Authors: Al-Shammari N. K. , Almansour H. B. , Syed M. B.
Published: April 2021

In today's out-breaking Covid-19 circumstance, treatments are preferred to be contactless. Social distancing has become a mandate in order to prevent disease spreading. In such a scenario, checking the body temperature is preferable to be made contactless because it helps the doctors and social workers to stay away from the symptomatic patients. Infrared (IR) contactless thermometers are employed in measuring the temperature while preventing direct contact with the body. Improved functionalities in the contactless thermometer can provide accurate precision in measurements and calculations. Technological advancement in pharmacy has cohesively improved over time. Coupling Machine Learning (CML) will revolutionize the process of testing. The demand for automated temperature test equipment is likely to grow at a significant pace, with the continuous advancements in technology and the adoption of ATE (Automated Test Equipment). The Global Positioning System (GPS) easy tracking and navigation can be used for easy tracking. Population density can be used to calculate the amount of population in a particular area. The proposed automatic contact-less thermometer system has the potential to replace the traditional temperature measuring techniques and safeguard from human-to-human transmission diseases.
Healthcare Financing and Health Outcomes: Analysis of Oil-Producing Countries in Africa
Authors: Opeloyeru Olaide Sekinat , Lawal Nurudeen Abiodun , Agbatogun Kehinde Kabir
Published: April 2021

The major concern of the study is on healthcare financing and health outcomes in the major oil-producing countries in Africa. We used the data sorted from World Development Indicators (WDI) to identify the effect of four different health expenditures on the rate of mortalities on maternal, under-five, infant, neonatal and life expectancy at birth through random and fixed-effect models. This paper also takes cognizance of the environmental variable (pollution) that is common to the top 10 oil-producing countries in Africa. Our findings showed that high health expenditure from government, private and external sources improved health outcomes, while health expenditure from out of pocket is detrimental to health outcomes. Also, the environmental variable has a negative impact on life expectancy. The outcome of the paper indicated that there is a need to reduce environmental pollution, increase health expenditure from government, private, external sources and reduce out of pocket payments in the selected areas.
Shifting Focus From Impairment to Inclusion: Expanding Occupational Therapy for Neurodivergent Students to Address School Environments
Authors: Chen Yu-Lun , Patten Kristie
Published: April 2021

Social participation in schools is critical to student academic and psychosocial outcomes. Neurodivergent students, however, often experience environmental barriers to social participation, such as lack of awareness and negative attitudes among peers and school staff, including teachers. Although authentic social participation is composed of dynamic interactions between a person and the external environments, occupational therapy’s role in addressing student social participation primarily focuses on internal social characteristics. Barriers within school environments often remain unaddressed, with no clear role for occupational therapy practitioners. We advocate an expansion of occupational therapy’s role to address school environments, especially the social, physical, and policy aspects, to promote social participation and inclusion. We also discuss the need for change and present a framework guiding intervention in school environments.
Phenomenological Study of the Transition Process for Adolescents With Intellectual and Developmental Disabilities
Authors: Benson Jeryl D. , Tokarski Rachel , Blaskowitz Meghan G. , Geubtner Ashlyn
Published: April 2021

Importance: Occupational therapy practitioners should understand the barriers faced by young adults with intellectual and developmental disabilities (IDD) who are attempting a successful transition to postsecondary work, higher education, community and social activities, and living opportunities so they can better advocate for them and tailor their involvement in the transition process.

Objective: To explore the lived experience of parents of adolescents with IDD participating in the transition process.

Design: Phenomenological design.

Setting: Community-based setting with interviews occurring face-to-face in the participants’ home or via telephone.

Participants: Eleven parents of adolescents and young adults (ages 16–22 yr) with IDD.

Outcomes and Measures: Semistructured interviews focusing on parent and family experiences with the transition process.

Results: Seven themes emerged from the data representing parent perceptions related to the use or lack of person-centered practices, needing more communication from the team, frustration with being the driving force of progress, feelings of defeat, gaps between programming options, positive team collaboration, and planning for the future.

Conclusions and Relevance: Parents identified person-centered planning, guidance from school staff, and resource sharing as desired practices in the transition planning process. The outcomes indicate that some aspects of the transition process have not changed in several decades.

What This Article Adds: Occupational therapy practitioners are optimally positioned to remediate transition issues; therefore, it is essential that they assert their integral role in the transition planning process to increase self-determination and quality of life for all adolescents and young adults with IDD.
Quality-of-Life Discrepancies Among Autistic Adolescents and Adults: A Rapid Review
Authors: Skaletski Emily C. , Bradley Laura , Taylor Desiree , Travers Brittany G. , Bishop Lauren
Published: April 2021

Importance: Quality of life (QoL) is a core outcome of occupational therapy, but it is decreased among autistic adolescents and adults. This is the first review of QoL from an occupational therapy standpoint.

Objective: To identify self-reported QoL differences between autistic and nonautistic samples; investigate sex differences in QoL among autistic people; examine consistency in QoL among autistic people across age, intellectual disability (ID), and self- versus proxy-report method; and appraise occupational therapy–related interventions addressing QoL among autistic people.

Data Sources: Articles published in peer-reviewed journals between 2010 and 2020, located through Academic Search Ultimate, PubMed, and OTseeker, along with the American Journal of Occupational Therapy, British Journal of Occupational Therapy, Canadian Journal of Occupational Therapy, and Australian Occupational Therapy Journal.

Study Selection and Data Collection: Article samples consisted of at least 20% autistic females and used self-reported QoL measures. Qualitative research was excluded, as well as studies with participants younger than age 13 yr. Twenty-seven articles qualified (3 Level 1B, 13 Level 3B, and 11 Level 4).

Findings: Autistic adolescents and adults demonstrated decreased self-reported QoL compared with nonautistic peers across age and ID presence. One article compared sex differences in QoL among autistic people. Interventions improved QoL among autistic people.

Conclusions and Relevance: Autistic adolescents and adults demonstrate decreased QoL in comparison with nonautistic peers. Questions remain related to sex differences in QoL among autistic people, an area for future research. Multiple evidence-based approaches to improve QoL in the autistic population are relevant to occupational therapy practice.

What This Article Adds: Self-reported QoL among autistic adolescents and adults is clearly lower than among their nonautistic counterparts. This article provides information on multiple interventions related to occupational therapy to improve QoL among autistic people.
Incivility in the Occupational Therapy Workplace: A Survey of Practitioners
Authors: Bolding Deborah J. , McCallister Cameron , Poisson Kate , Pufki David M. , Ramirez Angelica , Rickly Claire , Scattini Victoria
Published: April 2021

Importance: Incivility in health care settings has detrimental effects on practitioners’ well-being, patient outcomes, and health care costs.

Objective: To explore the prevalence and types of perceived incivility experienced by occupational therapy practitioners in their workplaces and the relationships between perceived incivility and practitioner demographics.

Design: Cross-sectional, online survey.

Setting: Surveys were posted to occupational therapy social media sites.

Participants: Occupational therapy practitioners throughout the United States.

Outcomes and Measures: The Negative Acts Questionnaire–Revised (NAQ–R) was used to measure incivility and bullying. Participants answered demographic questions, and one-way analyses of variance and t tests were used to examine differences between demographic characteristics and mean scores on the NAQ–R.

Results: A total of 1,320 practitioners completed the survey. Although the incidence of incivility was low compared with prior research in other health professions, 11% of respondents reported being victims of bullying in the workplace. Practitioners with less experience and who worked in long-term care and skilled nursing settings were more likely to experience incivility, and occupational therapy practitioners experienced significantly less incivility than occupational therapy assistants.

Conclusions and Relevance: Practitioners, colleagues, managers, and organizations must collaborate to foster an environment of civility and respect to mitigate the effects of incivility on patient outcomes, practitioners’ well-being, and health care costs.

What This Article Adds: This survey provides baseline information regarding incivility experienced by occupational therapy practitioners, an important first step in developing evidence-based interventions to promote safe and healthy workplaces.
METODOLOGIAS DE PREPARAÇÃO DE CORPOS DE PROVA PARA ESTUDOS GEOLÓGICO-GEOTÉCNICOS DE SILTITOS LAMINADOS (GRUPO ITARARÉ)
Authors: RIBEIRO Rogério Pinto , PARIZOTTO João Cândido Valenga , PARAGUASSÚ Antenor Braga
Published: April 2021

O presente trabalho destaca as dificuldades e aponta soluções para a obtenção de corpos de provas visando estudos geológicos e geotécnicos de rochas brandas. Trata-se de uma das operações mais complexas na temática destes materiais, especialmente quando elas se mostram muito susceptíveis à desagregação com mínimas variações da umidade relativa do ar. Diante destas constatações, é apresentada metodologia experimental envolvendo a extração de corpos de prova prismáticos e cilíndricos para ensaios destrutivos e não destrutivos (propagação de ondas) em siltitos argilosos do Grupo Itararé. A validade dos procedimentos adotados bem como as vantagens das amostras cilíndricas são discutidas, assim como os valores da resistência à compressão uniaxial e dos módulos estático e dinâmico de deformabilidade. Destaca-se a importância deste estudo uma vez que estes materiais problemáticos afloram nas imediações do aeroporto de Viracopos (Campinas) e também em parte do traçado previsto do Trem de Alta Velocidade (TAV) brasileiro, onde serão realizadas obras de engenharia tais como fundações, cortes e aterros, entre outras.
DISTRIBUICIÓN ESPACIAL 3D DEL VALOR-B EN EL SECTOR DEL VALLE MEDIO DEL MAGDALENA, COLOMBIA
Authors: L0NDONO John Makario
Published: April 2021

Se realizó un mapeo espacial 3D del valor b en el Valle Medio del Magdalena (VMM), Colombia. El valor b mostró cambios importantes en sentido W-E, predominando valores bajos (1.2), indicando posiblemente la presencia de asperezas o barreras. Las fallas Curumaní, Arenas Blancas y Cimitarra mostraron valores bajos de b (1.5) para sismos más profundos, indicando posiblemente liberación de esfuerzos en la parte superficial.

La loza de subducción de la placa Nazca presentó valores de b entre 0.8 y 1.0, hasta una profundidad de 120km, con variaciones importantes del valor b (0.5-1.3) en la parte superficial (10 y 30km), que podrían estar indicando diferentes estados de esfuerzos, en particular para la zona norte y centro del VMM. No se observa ninguna evidencia de subducción profunda de la placa Caribe en este sector de Colombia.
SENSORIAMENTO REMOTO EM ECOLOGIA DA PAISAGEM: ESTADO DA ARTE
Authors: RIBEIRO Hugo José , FERREIRA Nilson Clementino , KOPP Kátia Alcione , PEREIRA Tatiane Souza Rodrigues , OLIVEIRA Wellington Nunes de
Published: April 2021

Os estudos de ecologia de paisagem, assim como os padrões espaciais, influenciam os processos ecológicos e, a utilização desta informação com a cobertura terrestre por detecção remota é indispensável para a realização de análises espaciais. Este artigo de revisão discute como o Sensoriamento Remoto está sendo utilizado em Ecologia da Paisagem nos últimos sete anos. Para isso, foi feita uma revisão sistemática da literatura com o apoio do programa State of the Art - START projetado especificamente para este propósito, considerando artigos de periódicos indexados com fator de impacto maior que dois. A pesquisa foi realizada a partir de questões, como: quais tópicos são mais pesquisados nos últimos anos? Que tipo de abordagem está sendo aplicada? E quais técnicas de sensoriamento remoto (SR) estão sendo usadas na pesquisa de ecologia de paisagens? Essas perguntas foram respondidas pela vasta literatura científica disponível. A pesquisa mostrou que os tópicos mais pesquisados foram o padrão e dinâmica espacial, ambos com cerca de 24% dos artigos analisados. A abordagem metodológica mais utilizada pelos pesquisadores com 61% do total e o pré-processamento foi a técnica mais amplamente aplicada, com 81% do total.
APORTE DE CARBONO ORGÂNICO EM DIFERENTES PERÍODOS HIDROLÓGICOS NO RIO TAPAJÓS (PA), AMAZÔNIA, BRASIL
Authors: SOUZA Renata Silva , MOURA José Mauro Sousa , SILVA Rodrigo da , Max Holmes Robert , PEUCKER-EHRENBRINK Bernhard , SPENCER Robert G.M. , SOUSA Wildson Silva de
Published: April 2021

O rio Tapajós é um afluente de águas claras da margem direita do rio Amazonas, drenando uma área de 492.263 km2 da região central do Brasil para a porção central do estado do Pará. O objetivo deste estudo é determinar as concentrações de carbono orgânico (COP e COD) transportados no rio Tapajós em Itaituba/PA, avaliando a influência da vazão e as mudanças hidrológicas sazonais. Amostras mensais de água de superfície foram coletadas em 2016 e os parâmetros biogeoquímicos (pH, condutividade elétrica, oxigênio dissolvido e temperatura) foram medidos in locu. Os valores de sedimento foram analisados através de testes estatísticos em relação aos dados hidrológicos (precipitação, cota e vazão) fornecidos pelo INMET e banco de dados HyBam. A média anual de COP foi 14,35±10,0 mg L-1, com média de 20,8 mg L-1 na cheia e de 7,9 mg L-1 na seca. O COD teve média anual de 3,8±2,18 mg L-1, com média de 4,97 mg L-1 na cheia e de 2,32 mg L-1 seca,. Nossos resultados sugerem que as mudanças hidrológicas sazonais são a principal causa das mudanças nos sedimentos transportados no rio Tapajós, com possíveis associações às atividades de mineração e outras ações antrópicas ao longo de seus afluentes.
INVERSÃO GRAVIMÉTRICA 3D DE CORPOS SALINOS NA BACIA DE CAMPOS UTILIZANDO DADOS DE SENSORIAMENTO REMOTO
Authors: LIMA Fabio Ullmann Furtado de , CARVALHO Leila Maria Véspoli de
Published: April 2021

Foi realizada a inversão tridimensional de dados gravimétricos oriundo de sensoriamento remoto com o objetivo de estimar as geometrias em sub-superfície de dois corpos salinos inseridos na Bacia de Campos. As modelagens dos corpos são baseadas em informações a priori tais como: contrastes de densidade entre corpos e o meio, números de prismas e números de vértices de cada prisma que, superpostos, modelarão a forma dos corpos salinos, profundidades e distâncias radiais mínimas e máximas dos corpos, coordenadas de origem dos prismas (a partir das quais o modelo começará a construir os corpos salinos), entre outros. Todas estas informações a priori provêm de um ensaio sísmico de reflexão realizados na região de estudo. Foram modelados paredões de sal considerando dois casos distintos: uma anomalia residual Bouguer aberta (caso 1) e outra fechada (caso 2). As geometrias dos paredões de sal foram modeladas satisfatoriamente em ambos os casos. Entretanto, o tamanho do paredão no caso 1 teve que ser subestimado para se obter um melhor ajuste entre as isogais observadas e preditas. Conclui-se que o modelo parece mais eficiente em modelar anomalias Bouguer fechadas do que abertas.
O DEPÓSITO POTASSÍFERO DE AUTAZES NO CONTEXTO ESTRATIGRÁFICO DA BACIA DO AMAZONAS
Authors: KIEFER Gustavo Lage Sousa , UHLEIN Alexandre , FANTON José Jacob
Published: April 2021

RESUMO - O Depósito Potassífero de Autazes, com reservas totais superiores a 767 Mt e teor médio de 30,71% de cloreto de potássio (KCl), corresponde a um horizonte mineralizado sub-horizontal, posicionado nos estratos superiores do Ciclo VII da Sequência Evaporítica Pensilvaniana-Permiana da Bacia do Amazonas. Este trabalho apresenta as características gerais da mineralização do depósito a partir dos dados oriundos do programa de pesquisa mineral para sais de potássio empreendido pela Potássio do Brasil Ltda., entre os anos de 2010 e 2014, na região de Autazes, Amazonas, Brasil. Esses dados indicam que a mineralização em Autazes abrange uma área de 155 km², com espessura média de 2,07 m e situa-se entre as profundidades de 685 m e 865 m, segundo três unidades contíguas e sobrepostas denominadas, da base para o topo, como: 1) Intervalo Mineralizado Inferior; 2) Intervalo Mineralizado Intermediário; 3) Intervalo Mineralizado Superior; com marcantes variações nas distribuições dos teores de KCl e espessuras, associadas a feições petrográficas, geoquímicas e mineralógicas dessas unidades nas regiões nordeste, noroeste e sul do depósito.
GEOLOGIA E GEOQUÍMICA DAS ROCHAS GRANÍTICAS DA SUÍTE INTRUSIVA SERRA DA PROVIDÊNCIA NA REGIÃO DE JUÍNA, NOROESTE DO ESTADO DE MATO GROSSO
Authors: GODOY Antonio Misson , MANZANO Jeferson Cassu , SILVA Jesué Antonio da , VIEIRA Otávio Augusto Ruiz Paccola , ARAÚJO Larissa Marques Barbosa de
Published: April 2021

As rochas graníticas associadas à Suíte Intrusiva Serra da Providência, ocorrem nas proximidades da cidade de Juína, no extremo noroeste do Estado de Mato Grosso e estão inseridas no sudoeste do Cráton Amazônico, na Província Rondônia-Juruena no Domínio Roosevelt-Aripuanã. São rochas intrusivas em litotipos da sequência metavulcanossedimentar do Grupo Roosevelt, e agregam pequenos corpos ígneos, além de um batólito principal de forma alongada na direção geral E-W, com feições texturais marcantes rapakivi, aqui denominado de Batólito Granítico Juína. Dominam as variedades sieno- a monzogranitos porfiríticas de coloração rósea a cinza claro, apresentando fenocristais de feldspato potássio rapakivi de até 5 cm, inseridos em matriz de granulação grossa escura e rica em biotita e raras hornblenda, o que possibilita a identificação de variedades leuco- a melagranitos. São identificadas rochas róseas e cinza, inequigranulares de granulação média a grossa e equigranulares grossa, além de feições aplíticas e pegmatóides. Observa-se uma forte deformação, impondo diversas variedades litológicas, texturas miloníticas bandadas e porfiroclásticas. São granitoides ferrosos, Tipo A, metaluminoso a peraluminoso, da série cálcio-alcalino de alto potássio a shoshonítica, pós- colisional a anorogênico e formados em ambiente tectônico de arco magmático a intraplaca
SISTEMAS PETROLÍFEROS ATÍPICOS NAS BACIAS PALEOZOICAS BRASILEIRAS – UMA REVISÃO
Authors: CIOCCARI Giovani Matte , MIZUSAKI Ana Maria Pimentel
Published: April 2021

Sistemas petrolíferos atípicos são reconhecidos pelas transformações do conteúdo orgânico ou mineral de rocha encaixante, causada essencialmente pelo efeito térmico da dispersão do calor da soleira ígnea. Pode ser identificado pela auréola de contato, tendo como principal finalidade indicar se a rocha encaixante foi inserida na janela de geração de óleo e gás. O objetivo deste trabalho foi realizar uma revisão bibliográfica sobre os sistemas petrolíferos atípicos das principais bacias paleozoicas brasileiras e contribuir no conhecimento destes sistemas petrolíferos. No Brasil, exemplos de geração atípica ocorrem nas bacias paleozoicas do Solimões, Parnaíba e Paraná com acumulações de óleo e gás. Os intervalos de tempo com maior potencial para existência de rocha geradora nestas bacias são Siluriano, Devoniano e Permiano, que podem estar associados a soleiras com idades em torno de 200 Ma e 130 Ma. Conclui-se que nas bacias paleozoicas brasileiras, os sistemas petrolíferos atípicos são: (1) Bacia do Paraná - Vila Maria-Alto Garças/Iapó (.), Vila Maria-Furnas (.), Ponta Grossa-Itararé (!), Irati-Piramboia (!) e Irati-Rio Bonito (!); (2) Bacia do Parnaíba - Tianguá-Ipu (!), Tianguá-Jaicós (?), Pimenteiras-Cabeças (!), Pimenteiras-Poti (.), Pimenteiras-Pimenteiras (.) e Longá-Poti (.); e (3) Bacia do Solimões - Jandiatuba-Juruá (!), Jandiatuba-Uerê (.) e Uerê-Uerê (.).
POLÍNIAS COSTEIRAS DA ANTÁRTICA ATRAVÉS DE UMA REANÁLISE OCEÂNICA DE ALTA RESOLUÇÃO
Authors: HASHIMOTO Camila , MATA Mauricio Magalhães
Published: April 2021

As polínias costeiras são conhecidas como “fábricas” de gelo marinho com importância, desde aspectos climáticos até biológicos. Os processos que ocorrem nas polínias afetam a formação de águas de fundo, devido ao efeito brine. A alternativa mais usada para investigar as polínias é através do sensoriamento remoto, com o avanço tecnológico em assimilação de dados em modelos oceânicos, os produtos de reanálises oceânicas passam a ser uma alternativa. Assim, este estudo comparou a representação das áreas das polínias no produto da GLO-HR com as observações satelitais a partir da concentração de gelo adquirida pelo sensor AMSR-E. A média da área diária de onze polínias costeiras foi calculada no período de congelamento (2013 – 2016) e a representação foi condizente com as posições relatadas, pois a resolução mais refinada da GLO-HR retrata áreas com maior precisão, porém menores. A salinidade aumentou em quase todas as polínias, porém não houve correlação com a área. A correlação com os ventos demonstrou a direção determinante nas fases de abertura e fechamento das polínias. Concluindo, há mais fatores que auxiliam no fechamento do que na abertura das áreas, e compreender a variabilidade das polínias permite detalhamento nos modelos oceânicos, principalmente aos processos ocorridos na plataforma continental.
COMPONENTES BIOGÊNICOS COMO INDICADORES AMBIENTAIS DA PLATAFORMA CONTINENTAL DO ESTADO DE SERGIPE E SUL DE ALAGOAS
Authors: SANTOS Jonas Ricardo dos , SOUZA Rosemeri Melo e , ANDRADE Edilma , FONTES Luiz Carlos da Silveira
Published: April 2021

O presente trabalho tem como objetivo caracterizar a distribuição dos componentes biogênicos e correlacionar aos fatores ambientais como a profundidade, morfologia, composição e granulometria dos sedimentos superficiais da Plataforma Continental de Sergipe e sul de Alagoas. Foram realizadas análises de identificação da composição e componentes biogênicos em 423 amostras de sedimentos superficiais. A determinação dos componentes biogênicos dos sedimentos foi realizada em lupa binocular em duas frações granulométricas, obtidas através do processo de peneiramento mecânico (areia fina a média e areia muito grossa a grânulo) e posteriormente separados de forma aleatória, 200 grãos para a análise composicional e de biodetritos. Os resultados indicam que esta plataforma é mista siliciclástica-carbonática e a transição da composição sedimentar com o aumento da profundidade, dos sedimentos de origem continental para os sedimentos biogênicos, sendo esta característica interrompida pelas zonas lamosas do São Francisco e Japaratuba. Os componentes biogênicos mais abundantes são os foraminíferos e a algas vermelhas, responsáveis pela formação de um banco carbonáticos na plataforma externa e a distribuição dos sedimentos biogênicos na plataforma continental SEAL resulta de um ajuste morfodinâmico entre a circulação e a topografia da plataforma.
LATE CRETACEOUS STRATIGRAPHY OF THE SOUTHEASTERN CHACO - PARANÁ BASIN (“NORTE BASIN” - URUGUAY): THE MAASTRICHTIAN AGE OF THE CALCRETIZATION PROCESS
Authors: VEROSLAVSKY Gerardo , AUBET Natalie , MARTÍNEZ Sergio A. , HEAMAN Larry M. , CABRERA Fernanda , MESA Valeria
Published: April 2021

In the last 40 years, successive revisions have been introduced to the lithostratigraphy of the Late Cretaceous of the Norte Basin, whose record is formed by predominantly siliciclastic continental fossiliferous sedimentary rocks. A factor that contributed to the terminology proliferation was the misplaced importance attributed to the epigenetic processes and products (calcretes and ferricretes, occasionally fossiliferous) affecting those siliciclastic rocks. Based on field work and lithological logs from a number of key areas, the validity of the original stratigraphic column showing, from base to top, the Guichón, Mercedes, Asencio and Queguay formations is supported. For those particular units, the lithostratigraphic scope given by the original definitions is correct and, with minimum adjustments, they should be restored for their practical usefulness as geological mapping units. An evolutionary scheme for the Late Cretaceous of the Norte Basin is herein presented, with the aim of contributing to a greater understanding of the succession of sedimentary and epigenetic processes. A Maastrichtian age is proposed for the carbonatic cementation and/or substitution that affected the Mercedes and Asencio formations, thus originating the Queguay Formation, based on absolute age of the calcite cement (~ 72 Ma; U-Pb), paleontological data, and the correlation established with similar events recorded in the Marília Formation on the Bauru Basin (Brazil).
FORAMINÍFEROS E OSTRACODES DO CENOMANIANO - TURONIANO DA BACIA SERGIPE ALAGOAS: IMPLICAÇÕES BIOESTRATIGRÁFICAS E PALEOECOLÓGICAS
Authors: MELO Robbyson Mendes , SARMENTO Mayara Guedes , PIOVESAN Enelise Katia
Published: April 2021

No presente estudo, são apresentados os foraminíferos e ostracodes recuperados em uma amostragem da Formação Cotinguiba, Bacia de Sergipe-Alagoas. A microfauna de ostracodes é composta por uma abundância de Paracypris eniotmetos (Candonidae) e trachyleberidídeos (Sergipella? sp., Sapucariella multidifferentis e Sapucariella sp.), além dos táxons Cytherella gambiensis e Cytherelloidea sp. pertencentes a família Cytherellidae. A associação de foraminíferos bentônicos é composta por táxons aglutinantes com predomínio dos spiroplectamminídeos (Quasispiroplectammina cf. regoi e Quasispiroplectammina sp.), e táxons de carapaça calcária-hialina, representada por gavelinelídeos e turrinilídeos (gênero Praebulimina) que dominam a associação. A assembleia de foraminíferos planctônicos é caracterizada pela frequência de Planoheterohelix ex gr. globulosa e abundantes hedbergenilídeos, representado pelo gênero Whiteinella (Whiteinella baltica, Whiteinella cf. baltica, Whiteinella aff. archaeocretacea, Whiteinella ? sp.), além de Muricohedbergella cf. delrioensis, Muricohedbergella sp. Clavihedbergella simplex e Falsotruncana? sp. Com base nessa associação planctônica, bem como na ocorrência de Sapucariella multidifferentis, a amostra foi posicionada na transição Cenomaniano-Turoniano (94,03 m.a), dentro da Zona W. archaeocretacea. A associação identificada evidencia um domínio de táxons oportunistas de ambientes mesotróficos para eutróficos, tolerantes a variações nos níveis de oxigênio e importantes marcadores globais do OEA 2 (Cenomaniano-Turoniano).
MÉTODO DE DATAÇÃO RADIOMÉTRICA APROXIMADA DE UM CONDRITO COMUM UTILIZANDO O SISTEMA ISOTÓPICO Pb206-Pb207 ATRAVÉS DA ANÁLISE QUÍMICA DE MICROSSONDA ELETRÔNICA DE PLAGIOCLÁSIOS METAMÓRFICOS
Authors: GAZILLO NETO Ricardo
Published: April 2021

Condritos comuns são meteoritos que quando submetidos a metamorfismo termal desenvolvem minerais de recristalização como o plagioclásio que contêm a composição da matriz condrítica original. A matriz de um condrito carbonáceo primitivo pode ser considerada complementar de um condrito comum ou não carbonáceo o que permite analisar o fracionamento de elementos traço de um reservatório geoquímico para outro. Quantidades de chumbo foram analisadas por microssonda eletrônica no condrito comum Campos Sales (L5) e essas quantidades foram utilizadas para datar os plagioclásios através da correlação das suas concentrações de Pb com as razões isotópicas Pb206/Pb204 e Pb207/Pb204 do condrito carbonáceo Allende através do conceito de fracionamento geoquímico e cosmoquímico do elemento Pb. Os dados estatísticos gerados foram utilizados para obter a idade aproximada do metamorfismo dos plagioclásios do Campos Sales através do sistema isotópico Pb206-Pb207. O método aqui demonstrado de datação química fornece uma idade com grande margem de erro de 652 Ma devido à precisão próxima do limite de detecção para os elementos traço na microssonda eletrônica e às considerações feitas sobre fracionamento geoquímico, mas apresenta-se consistente em relação aos resultados esperados para a idade dos condritos.
METODOLOGIA PARA CLASSIFICAÇÃO DO ÍNDICE DE PERIGO (iP) EM BARRAGENS DE REJEITO DA MINERAÇÃO
Authors: ALMEIDA Lucas Gomes de , CORTELETTI Rosyelle Cristina , DUTRA Luiz Fernandes
Published: April 2021

É de suma importância que as barragens, em especial as de rejeito da mineração, apresentem níveis satisfatórios e aceitáveis de segurança. Assim, o presente trabalho propõe a criação de uma metodologia para determinação e classificação de índices de perigo (iP) e o mapeamento de potenciais impactos associados à essas estruturas em situações hipotéticas de ruptura. A pesquisa propõe a utilização de um método de hierarquização multicriterial, conhecido como Analytic Hierarchy Process (AHP) e caracterizado pela diminuição de subjetividade durante as avaliações. Destaca-se que esse tipo de ferramenta, além do caráter objetivo, permite a avaliação das medidas de prevenção que garantem a segurança e minimizam possíveis eventos. Após a quantificação e da aplicação de técnicas estatísticas, foi realizada a classificação de cada uma das estruturas avaliadas quanto ao grau de perigo, por exemplo, em baixo, médio e alto. Finalmente, com base nos resultados obtidos, principalmente para a barragem de Fundão, conclui-se que a metodologia proposta mostrou-se eficaz e com viabilidade prática, podendo ser útil às empresas do ramo de mineração. Verifica-se também que ela permite ações mitigadoras e a redução de eventos que possam contribuir para o rompimento dessas barragens, propósito dos programas de gestão para empreendimentos desta natureza.