bluuebunny/crossref_metadata_2025_split huggingface dataset:
From Static to Dynamic Modeling of Surfactants Micellization
Authors: Vitková Zuzana , Tárník Marián , Pavlovičová Jarmila , Vitko Anton , Oremusová Jarmila , Murgaš Ján , Babinec Andrej 
Published: February 2021

Abstract
Micelles and micellization appeal long lasting interest as promising drug carriers. A conventional parameter providing information about formation of micelles is critical micelle concentration (cmc). Its value roughly separates two states of the surfactant solution – namely states with and without presence of micelles. If concentration of surfactants in water solution approaches cmc some physical quantities abruptly change, and this phenomenon is a key to determine value of the cmc. From numerous approaches for determination of the cmc the paper considers the conductivity-based method. But rather than studying the mechanism of micellization that is primarily carried out by the colloid chemists, the paper is focused on the development of an information rich and optimal dynamical model of the conductivity vs. concentration dependence. The model is derived from the solutions of the 1st order differential equation. The optimal model parameters are determined by the downhill simplex algorithm and the cmc is computed on the basis of the curvature of the concentration dependence of the conductivity.
Classificação semiquantitativa de espermatozoides otimiza a genotipagem de backlog de amostras de crimes sexuais
Authors: Cândido Alexandra Lopes , Carvalho Nígela Rodrigues , Chaves Paulo Bomfim , Martinucci Bruno , Godinho Neide Maria de Oliveira , Da Mota Mariana Flavia 
Published: February 2021

A realização de testes genéticos em vestígios de crimes sexuais pode ser feita com ou sem a análise prévia de espermatozoides por microscopia, que permite inferir a quantidade de espermatozoides na amostra. Para amostras com presença de espermatozoides, a extração diferencial é o protocolo recomendado na etapa de lise celular, pois permite isolar o DNA das células espermáticas (DNA do agressor) do DNA das células da vítima, melhorando assim a recuperação do perfil genético do agressor. Neste trabalho analisamos a relação entre uma classificação semiquantitativa de espermatozoides e o DNA masculino quantificado por qPCR (PCR quantitativo) e a qualidade do perfil genético de amostras de crimes sexuais ocorridos no Estado de Goiás (Brasil). Para tanto foram analisados 93 suabes vaginais com presença de espermatozoides após extração diferencial, seguida de quantificação de DNA via qPCR e genotipagem de marcadores microssatélites de uso forense. Não foi observada relação clara entre os três grupos de contagem de espermatozoides e a razão de DNA masculino e feminino (M:F) nas amostras analisadas. Contudo, constatou-se uma tendência de aumento significativo da quantidade de DNA masculino com o aumento do número de espermatozoides. Esse resultado foi seguido da melhora na qualidade do perfil genético das amostras contendo mais DNA masculino. A contagem de espermatozoides pode ser usada para priorizar amostras a serem analisadas em esforços de genotipagem em massa de vestígios de crimes sexuais que aguardam processamento (backlog). Ela aumenta a previsibilidade dos resultados e a taxa de sucesso do exame de DNA.
Ollier Disease: A Case Series and Literature Review
Authors: Markevičiūtė Vėtra , Markevičiūtė Medeinė Šilenė , Stravinskas Mindaugas 
Published: February 2021

Background. Ollier disease is the most common nonhereditary type of enchondromatosis. Enchondromas are common, usually benign intraosseous cartilaginous tumors that form near the growth plate cartilage predominantly unilaterally in the metaphyses and diaphyses of tubular bones. They usually affect the long bones of the hand, the humerus, and the tibia, followed by flat bones, such as the pelvis. The estimated prevalence of Ollier disease is 1 in 100,000 and while it is linked with somatic heterozygous mutations in IDH1 or IDH2 genes, exact etiology is unknown. The risk of malignant transformation towards chondrosarcoma is up to 30–35% and it is clinically suspected when pain and a rapid increase in the size of the lesions is seen.Case presentations. We report two clinical cases of patients diagnosed with Ollier disease. In both cases transformation to chondrosarcoma was observed.Conclusions. Ollier disease is a rare disorder, defined by the presence of multiple enchondromas and an asymmetric distribution of the cartilage lesions that can be extremely variable in terms of size, location, age, gender. Constant monitoring of patients is important due to the high risk of malignancy. Because the disease is very rare and the manifestations vary widely, each patient’s case must be evaluated, and the treatment strategy adopted individually.
Tailoring physical functionalities of complex oxides by vertically aligned nanocomposite thin-film design
Authors: Huang Jijie , Li Weiwei , Yang Hao , MacManus-Driscoll Judith L. 
Published: February 2021

AbstractSelf-assembled nanocomposite thin films couple two materials into a single film, typically, in the form of vertically aligned nanopillars embedded in a matrix film. High-density vertical heterointerfaces provide a great platform for engineering new physical properties and novel multifunctionalities, as well as for nanoscale device integration. Tremendous research efforts have been devoted to developing different nanocomposite systems. In this article, we summarize recent progress on vertically aligned nanocomposite thin films for enhanced functionalities such as ferroelectricity, tunable magnetoresistance, multiferroicity, dielectricity, magnetic anisotropy, perpendicular exchange bias, novel electrical/ionic properties, interfacial conduction, and resistive switching. Using specific examples, we discuss how and why the fundamental physical properties can be significantly tuned/improved in vertically aligned nanocomposites. Finally, we propose future research directions to achieve further enhanced performance as well as practical devices.
An Analysis of Students Geometry Skills with Different Visual-Spatial and Logic-Mathematic Intelligence in Solving the Problem of Solid Plane Geometry
Authors: Astuti Desi Puji , Sutopo Sutopo , Nurhasanah Farida 
Published: February 2021

<div class="WordSection1"><p class="BodyAbstract">This paper aims to find out the geometry skills of students with different levels of visual-spatial and logic-mathematic intelligence in solving the problem of solid geometry plane surfaces. It is qualitative descriptive research. Interview and test were employed to get data about students’ geometry skills in solving the problem of solid geometry plane surfaces. To maintain the worthiness of the data, the researcher implemented the time triangulation method. The data analysis comprised of data reduction, data display, and verification. This research used purposive sampling to determine the subjects. The results of this research indicated that the students with low visual-spatial intelligence and low logic-mathematic intelligence had visual skills level 0, the verbal skills did not reach level 0, the logical skills did not reach level 0, drawing skills of subject RR1 was level 0 and subject RR2 did not reach level 0, and applied skills level 1. The students with low visual-spatial intelligence and high logic-mathematic intelligence had visual skills level 0, verbal skills level 2, logical skills level 1, drawing skills level 1, and applied skills level 1. The students with high visual-spatial intelligence and low logic-mathematic intelligence had visual skills level 0, verbal skills level 2, logical skills level 0, drawing skills level 0, and applied skills level 1. The students with high visual-spatial intelligence and high logic-mathematic intelligence had visual skills level 0, verbal skills level 2, logical skills level 1, drawing skills level 1, and applied skills level 1..</p></div>
Relationship between Views of Progressivism and Curriculum 2013 on Mathematics Learning
Authors: Rachmawati Intan 
Published: February 2021

<span lang="EN-US">Progressivism is one of the streams that can contribute and require problem solving in mathematics learning. Progressivism supports changes for the better that prioritize students and develop various student abilities in the implementation of learning. Educational programs that prioritize students in the progressivism view of the curriculum. The 2013 curriculum is a learning system renewal that is expected to further develop the potential of students. The 2013 curriculum requires students who are passive to be active in order to solve problems in learning mathematics. The implementation of the 2013 curriculum changes previous learning activities towards a learning system more advanced so that students' ability to solve math problems can develop. This article aims to determine the relationship between progressivism views and the 2013 curriculum on mathematics learning. This article uses a literature study method. This data is obtained from some of the research results contained in books, journals, and proceedings that are related to the title of the article. The results show that the viewpoint of progressivism is interrelated with the 2013 curriculum in mathematics learning. Progressivism can make a major contribution to the development and progress in the implementation of the 2013 curriculum, it can be seen from the relationship between the two wanting a change in the learning process so that it focuses more on students. </span>
Factors that Influence Teenage Antenatal Care Utilization in John Taolo Gaetsewe (JTG) District of Northern Cape Province, South Africa: Underscoring the Need for Tackling Social Determinants of Health
Authors: Worku, PhD Eshetu Bekele , Woldesenbet, PhD Selamawit Alemu 
Published: February 2021

Background and Objectives: In resource-limited settings, the uptake of antenatal care visits among women, especially teenage pregnant women, is disturbingly low. Factors that infl uence the uptake of ANC services among teenage women is largely understudied and poorly understood in John Taolo Gaetsewe (JTG), a predominantly rural and poor district of South Africa. The aim of this study was to determine the factors that infl uence uptake of ANC services among teenage mothers in JTG district.
Methods: A cross-sectional health facility-based study utilising mixed method was conducted in all public health facilities (n=44) at JTG district. Mother-infant pairs (n=383) who brought their infants for six-week first DPT immunisation during the study period were enrolled in the study. Structured questionnaires were used to collect data on demographic, socio-economic and uptake of ANC indicators.
Results: Out of 272 respondent mothers, 18.68% were adolescent mothers (13-19 years). The logistic regression analysis shows that mother’s age (OR=2.11; 95%CI = 1.04 - 4.27); distance to the nearest health facility (OR=3.38; 95%CI = 1.45-7.87); and client service satisfaction (OR=8.58; 95%CI =2.10-34.95 are significantly associated with poor uptake of ANC services.
Conclusion and Global Health Implications: There is a need to improve the quality of adolescent reproductive health services tailored to their health and developmental needs. Moreover, addressing the social determinants of health that affect individual’s healthy life style and health seeking behavior is critical.

Copyright © 2016 Worku and Woldesenbet. Published by Global Health and Education Projects, Inc. This is an open-access article distributed under the terms of the Creative Commons Attribution License CC BY 4.0.
Efficacious Use of Simple and Cost Effective Acoustic Flow Analyzer Measurement to Enhance Recovery and Improve Life Cycle of Wells
Authors: Alaref Omar , Saada Mahmoud , Abdelmoula Mongi , Rourke Marvin 
Published: February 2021

ABSTRACT
Well integrity technologies have been in high demand within the oil and gas industry in the recent years due to two main reasons; Recent incidents and down term in industry. The recent failures and blow out incidents occurring in different parts of the world encouraged new strategies and well integrity management systems to be deployed in order to ensure wells are meeting health, safety and environmental standards. Moreover, the down term in industry caused by relatively low oil price which led oil and gas operators to scale down on exploration and drilling and alternatively work-over existing wells. It is believed that the most economical way to work-over the well is by performing data acquisition first, which enables the work-over team to do an informed decision and tackle the specified problem, saving non-productive time.
One of the fast growing well integrity technologies is leak detection. Unlike conventional data acquisition techniques such as corrosion monitoring, leak detection method traces the fluids entering to the well-bore and gives a dynamic image of what's going on in a producing/injecting well. The leak detection is mainly based on passive acoustic measurement, which is typically based on listening to fluid vibration by moving through different aperture sizes, and recorded in different frequencies and amplitudes. Other measurements are recommended to add such as temperature, pressure and multiphase sensors (in case leak is suspected to be inside the tubing).
The technology has been used in various locations around the world with challenging environments. The typical and most desired ones are firstly the surface casing leaks where fluids of various types enter into the annuli between casings and build up on surface. Moreover, high amounts of undesired fluids contributing to the production and the source would be hard to identify with conventional technologies.
A Preliminary Assessment of the Hydrocarbon Potential of Kerio Valley Basin: Gravity and Magnetic Interpretation
Authors: Masinde Abiud , Simiyu Cleophas , Murunga Innocent , Muia George , Waswa Aaron , Barongo Justus 
Published: February 2021

ABSTRACT
The aim of the study was to assess the hydrocarbon prospectivity of the Kerio Basin in the Kenya Rift. An Isostatically corrected anomaly map produced from a Bouguer anomaly grid was filtered using a Hanning low pass filter of order 2 to remove low wavelengths. Four profiles were extracted from the grid to give 1D interpretation along straight lines. Magnetic grid was corrected for IGRF, diurnal, filtered using a 1 Hz low pass 10km Hanning filter to reduce noise, later, reduced to equator to place all anomalies directly over underlying sources and make anomalies less complicated. Tilt derivative of the magnetic grid was used to estimate depth to basement. The residual analytic signal anomaly map derived from the magnetic grid was used to capture the response of existing near surface magnetic signatures even the reversely magnetized ones.
Kerio basin is characterised by low gravity anomalies ranging between 35mGals to −100mGals related to variations in quantities of sediments deposited. Gravity profiles show that sediment thickness gradually increases to the south where we expect hydrocarbon accumulation. The magnetic anomaly map reveals low susceptibility rocks of between −20nT to −200nT to the south of the basin. Magnetic tilt depth indicates sediment thickness of 2.0-3.5Km above the basement. This corresponds to both gravity and magnetic interpretation of the same area. Integration of these data with seismic and other constraints may help gauge the hydrocarbon potential and reduce exploration uncertainty in the southern area of the Kerio Basin.
Pre-Messinian Petroleum Systems and Trap Style in the Offshore Western of Nile Delta; An Integrated Geological and Geophysical Approach
Authors: Monir Mostafa , Shenkar Omar 
Published: February 2021

ABSTRACT
Exploration in the offshore Nile Delta province has revealed several hydrocarbon plays. Deep marine Turbidites is considered one of the most important plays for hydrocarbon exploration in the Nile Delta. These turbidites vary from submarine turbidite channels to submarine basin floor fans.
An integrated exploration approach was applied for a selected area within West Delta Deep Marine (WDDM)
Concession offshore western Nile Delta using a variety of geophysical, geological and geochemical data to assess the prospectivity of the Pre-Messinian sequences. This paper relies on the integration of several seismic data sets for a new detailed interpretation and characterization of the sub-Messinian structure and stratigraphy based on regional correlation of seismic markers and honoured the well data.
The interpretation focused mainly on the Oligocene and Miocene mega-sequences. The seismic expression of stratigraphic sequences shows a variety of turbidite channel/canyon systems having examples from West Nile delta basin discoveries and failures.
The approach is seismically based focusing on seismic stratigraphic analysis, combination of structure and stratigraphic traps and channels interpretation. Linking the geological and geophysical data together enabled the generation of different sets of geological models to reflect the spatial distribution of the reservoir units.
The variety of tectonic styles and depositional patterns in the West Nile delta provide favourable trapping conditions for hydrocarbon generations and accumulations.
The shallow oil and gas discoveries in the Pliocene sands and the high-grade oils in the Oligo-Miocene and Mesozoic reservoirs indicate the presence of multiple source rocks and an appropriate conditions for hydrocarbon accumulations in both biogenic and thermogenic petroleum systems. The presence of multi-overpressurized intervals in the Pliocene and Oligo-Miocene Nile delta stratigraphic column increase the depth oil window and the peak oil generation due to decrease of the effective stress.
Fluids have the tendency to migrate from high pressure zones toward a lower pressure zones, either laterally or vertically. Also, hydrocarbons might migrate downward if there is a lower pressure in the deeper layers.
Well data and the available geochemical database have been integrated with the interpreted seismic data to identify potential areas of future prospectivity in the study area.
New Insights in the Evaluation of Reserves of Selected wells of the Pletmos Basin Offshore South Africa
Authors: Elamri Samir , Opuwari Mimonitu 
Published: February 2021

ABSTRACT
The area evaluated has similar structural styles and settings as the producing neighboring fields of F-A and E-M in the adjacent Bredasdorp basin Offshore South Africa. The main objective of this study is to create a 3-D-static model and estimate hydrocarbon reserves. Based on log signatures, petrophysical properties and structural configurations, the reservoirs were divided vertically into three reservoir units in order to be properly modelled in 3-D space. The thicknesses of the layers were determined based on the vertical heterogeneity in the reservoir properties. Facies interpretation was performed based on log signatures, core description and previous geological studies. The volume of clay and porosity was used to classify facies into five units of sand, shaly sand, silt, and clay. From petrophysical interpretation, a synthetic permeability log was generated in the wells which ties closely with core data. The J-function water saturation model was adopted because it produced better results in the clean sandstone sections of the reservoirs. A high uncertainty in the basement formation was observed due to very few wells drilled in the area and fault impact and thus resulted in evaluation of uncertainty of each zone separately. The uncertainty workflow was run using 100 trials and the base case P50 estimated 277 Bcf of Gas from the 1At1.
Bottom Hole Pressure Management in a Highly Permeable and Narrow Margin MPD Operation
Authors: Oseme Ugochukwu , Awe Sunday , Amah Obinna , Erinle Adeyemi , Akinfolarin Ayodele , Ibrahim Timothy , Roes Vincent 
Published: February 2021

ABSTRACT
Application of Managed pressure drilling (MPD) technology with other techniques to maintain constant Bottom Hole pressure (BHP) has been found to enhance drilling operations in applications where the margin between the pore pressure and fracture gradient is narrow and the reservoir permeability is high. Classic examples of such applications are deep water drilling, high pressure and high temperature (HPHT) regime and depleted reservoir environments.
In the Niger Delta, HPHT reservoirs can be found in well depths up to 17000 ftss with a drilling window range of 0.4 to1.6ppg. Typical reservoir characteristics are formation permeability of 124 – 204mD and reservoir mobility of 112 – 1000mD/cp. Generally in this type of environment and essentially where there are high uncertainties in the reservoir pressures and formation characteristics, significant process safety incidents have been found to occur during pumps off events as a result of variations in BHP outside the allowable limits of pore pressure (lower limit) and fracture gradient (upper limit). The risks of exceeding the allowable limits are the possibility of taking significant influx volume if BHP falls below the pore pressure and loss of well bore integrity if the BHP exceeds the fracture pressure. Consequences of any of these events are high nonproductive time (NPT), well cost escalation and inability to achieve well objectives.
This paper illustrates how in the recent HPHT exploration campaign carried out in Niger Delta, managing BHP was identified as a critical success factor. Hydrocarbon reserves of the exploratory objectives were successfully and safely unlocked by using MPD to maintain BHP within the allowable limits. The paper also illustrates how MPD application was enhanced by the use of high resolution pressure while drilling (PWD) technology.