bluuebunny/crossref_metadata_2025_split huggingface dataset:
Experimental study of combined low salinity and surfactant flooding effect on oil recovery
Authors: Araz Abdulmecit , Kamyabi Farad 
Published: December 2020

A new generation improved oil recovery methods comes from combining techniques to make the overall process of oil recovery more efficient. One of the most promising methods is combined Low Salinity Surfactant (LSS) flooding. Low salinity brine injection has proven by numerous laboratory core flood experiments to give a moderate increase in oil recovery. Current research shows that this method may be further enhanced by introduction of surfactants optimized for lowsal environment by reducing the interfacial tension. Researchers have suggested different mechanisms in the literature such as pH variation, fines migration, multi-component ionic exchange, interfacial tension reduction and wettability alteration for improved oil recovery during lowsal injection.
In this study, surfactant solubility in lowsal brine was examined by bottle test experiments. A series of core displacement experiments was conducted on nine crude oil aged Berea core plugs that were designed to determine the impact of brine composition, wettability alteration, Low Salinity Water (LSW) and LSS flooding on Enhancing Oil Recovery (EOR). Laboratory core flooding experiments were conducted on the samples in a heating cabinet at 60 °C using five different brine compositions with different concentrations of NaCl, CaCl2 and MgCl2. The samples were first reached to initial water saturation, Swi, by injecting connate water (high salinity water). LSW injection followed by LSS flooding performed on the samples to obtain the irreducible oil saturation.
The results showed a significant potential of oil recovery with maximum additional recovery of 7% Original Oil in Place (OOIP) by injection of LS water (10% LS brine and 90% distilled water) into water-wet cores compared to high salinity waterflooding. It is also concluded that oil recovery increases as wettability changes from water-wet to neutral-wet regardless of the salinity compositions. A reduction in residual oil saturation, Sor, by 1.1–4.8% occurred for various brine compositions after LSS flooding in tertiary recovery mode. The absence of clay swelling and fine migration has been confirmed by the stable differential pressure recorded for both LSW and LSS flooding. Aging the samples at high temperature prevented the problem of fines production. Combined LSS flooding resulted in an additional oil recovery of 9.2% OOIP when applied after LSW flooding.
Surfactants improved the oil recovery by reducing the oil-water interfacial tension. In addition, lowsal environment decreased the surfactant retention, thus led to successful LSS flooding. The results showed that combined LSS flooding may be one of the most promising methods in EOR. This hybrid improved oil recovery method is economically more attractive and feasible compared to separate low salinity waterflooding or surfactant flooding.
Análise temporal das taxas de suicídios no estado de Minas Gerais com modelos ARIMA
Authors: Marques Rodnei Alves , Silva Spencer Barbosa da 
Published: December 2020

O autoextermínio tem aumentado em Minas Gerais em todas as faixas etárias. Tal fato, além de resultar em perda de vidas humanas, demanda recursos públicos que poderiam ser aplicados em outras áreas da saúde. Isto posto, esse trabalho tem como objetivo modelar e fazer previsões para as taxas específicas de suicídio por sexo no estado de Minas Gerais. Estas análises, juntamente com estudos clínicos, podem compor mais uma alternativa para os órgãos de saúde, auxiliando-os no preparo de ações que possam diminuir de forma efetiva o número de suicídios. As séries foram ajustadas com a metodologia de Box & Jenkins com utilização dos softwares Re GRETL. Foi observada uma tendência crescente histórica nas séries ao longo dos anos para as taxas específicas de suicídios masculinos e femininos e conclui-se que este crescimento ainda prevalece para os próximos anos caso não haja nenhuma intervenção mais efetiva. Palavras-chave: Séries temporais. Taxa de suicídios. Modelos ARIMA. Previsões.

Temporal analysis of suicide rates in the state of Minas Gerais with ARIMA models
Abstract
Self-extermination has increased in Minas Gerais in all age groups. This fact, besides resulting in the loss of human lives, demands public resources that could be applied in other areas of public health. From this point, this work aims to model and make predictions for specific suicide rates by gender in the state of Minas Gerais. These analyses, combined with clinical studies, can be another alternative for health public agencies, helping them to prepare actions that can effectively reduce the number of suicides. The series were adjusted using the Box & Jenkins methodology using the R and GRETL softwares.A historical growing trend was observed in the series over the years for specific rates of male and female suicides and we concluded that this growth shall remain for the next years if there is no other effective intervention.
Keywords: Time series. Suicide rate. ARIMA Models. Forecasts.
Gazella bennetti (indian gazelle or chinkara) of Pakistan: genetic profiling and conservation priorities
Authors: Hussain T. , Manzoor F. , Musthafa M. M. , Marikar F. M. , Babar M. E. 
Published: December 2020

La gacela india es oriunda de la zona silvestre del norte de Pendjab (Pakistán). De acuerdo a las categorías de la lista roja de la Unión Internacional de Conservación de la Naturaleza y los Recursos Naturales, constituye una especie en peligro. El entendimiento de la genética de la respuesta inmune en esta especie puede ser útil para diseñar efectivas estrategias de conservación. El objetivo del estudio fue evaluar la diversidad genética molecular en la interleukina 2 (IL-2), secuencias de genes que ponen en peligro a G. bennetti como un gen que codifica una citokina involucrada en algunas actividades vitales de regulación de la respuesta inmune. El gen IL-2 (492 bp) fue amplificado y secuenciado en muestras de ADN colectadas de la naturaleza, así como de ejemplares cautivos de gacela india, seguidos por la alineación y el análisis filogenético. Los vecinos que unen el árbol construido de MEGA6 mostraron que G. bennetti es distinto de otros y forma un clado diferente. El análisis de los resultados del estudio mostró que las gacelas indias constituyen una única población aislada encontrada en Pakistán, la cual es endémica y está expuesta al peligro. Por consiguiente, las técnicas de conservación in-situ y ex-situ para G. bennetti constituyen una buena alternativa para evitar el peligro de extinción de la especie.
Actividad glutatión peroxidasa en vacas lecheras sin suplementar y suplementadas con selenio
Authors: Bianchini G. , Masso R. J. , Rinaudo A. , Marini P. R. 
Published: December 2020

El objetivo del presente trabajo fue evaluar los niveles de la actividad glutatión-peroxidasa(GPX) en vacas lecheras suplementadas y sin suplementar con selenio (Se) intra-ruminal.Se determinó la actividad GPX de 96 vacas Holstein primíparas y multíparas, clínicamentesanas, procedentes de un establecimiento comercial de la localidad de Centeno, Provincia deSanta Fe (Argentina). Se definieron dos categorías de reses según las determinaciones individuales de GPX tomando como valor de corte 130 U/gHb. Los animales de cada categoría se dividieron aleatoriamente en dos subgrupos, uno de los cuales recibió un bolo intraruminalde Se de larga acción (Permatrace®) mientras que el otro permaneció sin suplementar. Acontinuación, se efectuaron dos nuevas determinaciones de la actividad enzimática: preparto(entre los 30 y los 15 días previos al parto) y posparto (entre los 30 y los 45 posteriores alparto). El 35,4% de las vacas presentó valores de actividad de la enzima menores al valor decorte. Los animales con bajos valores basales de actividad GPX no suplementadas con bolosde Se, no modificaron significativamente los datos basales. En las vacas con bajos valoresbasales de actividad GPX y suplementadas con Se, se observó un aumento significativo de laactividad enzimática. Se concluye que una proporción importante de animales presenta bajaactividad GPX, que los niveles de las enzimas se modifican según el momento de la evaluaciónen relación al tiempo del parto, y que la suplementación con bolos de Se intra-ruminalconstituye una estrategia efectiva para aumentar la actividad de la enzima.
Inclusión de harina de Moringa oleifera en dietas para pollos de engorde
Authors: Rugel D. O. , Emén M. F. 
Published: December 2020

El propósito de la inclusión de la harina de M. oleífera en dietas para pollos de engorde fue determinar su efecto en relación a la ganancia de peso. Se utilizaron 15 pollos Broiler cobb 500 con un peso promedio inicial de 45 g. La metodología empleada fue un diseño experimental completamente al azar (DCA), distribuido en tres tratamientos con cinco repeticiones. Los tratamientos fueron T1: balanceado comercial, T2: balanceado con harina de moringa al 7%, y T3: balanceado con harina de moringa al 15%. Se registraron los pesos semanales de cada grupo, hasta los 42 días. Los resultados evidenciaron que la adición de M. oleífera al 7% constituye una materia prima viable para implementarla en dietas basadas en balanceados comerciales, siendo bien tolerado y logrando un incremento significativo en el peso final de las aves.
Blockchain based Real Estate using Smart Contracts
Authors: Ryan Fernandes  , Andrew Fernandes  , Himani Jawale  
Published: December 2020

In today’s world global real estate investments have taken over more than twice the size of the stock market. Even after the dominance of the real estate market there are still a less number of investors due to liquidity and global access to sensitive or critical information. Due to various flaws in security in the current system, the tenants and owners are barely satisfied. The main focus of this paper is to incorporate the use of blockchain in the current real estate market and represent the facilities and advantages it can give to the real estate market. Blockchain based real estate is better because each block contains a cryptic hash of the previous record, a timestamp and transaction data which makes it difficult to forge documents and sensitive information of the investor. Another advantage of blockchain is that it is resistant to any type of data modification. Blockchain technology can sort out the security issues and forgery incidents that are faced by the real estate market. Also blockchain provides much meaningful assets and insights to the real estate market at a reasonable and stable-priced market. The proposed solution for the selected problem statement is Tokenizing real estate assets refers to a process in which a property owner can offer digital tokens that represent a share of their property. Using a blockchain to track these investments, with each transaction being time-stamped and immutable, makes it possible to limit the risk of fraud.
IIoT Framework for SME level Injection Molding Industry in the Context of Industry 4.0
Authors: W.D. Madhuka Priyashan  , Navod Neranjan Thilakarathne  
Published: December 2020

The Internet of Things (IoT) is a hype topic for nearly a decade now. Broadly growing, millions of devices get direct access to the Internet provides plenty of applications such as smart homes or mobile health management. This trend can also be found in the industry where IoT components hardened for these environments are introduced, called Industrial IoT (IIoT) devices which can be either sensors or actors, as well as mobile equipment such as smartphones, tablets, and smart glasses. Consequently, mobile communication becomes universal in smart factories. IIoT devices provide massive data on temperature, pressure, machine states, etc. But still, most of the SME level industries in the Asian region are new to these technological advancements. They still operate their facilities ith conventional setups without absorbing the new opportunities which are presented by IoT.
In the plastic injection molding industry, process parameters perform a significant role in the quality of the output product. During the manufacturing process, these process parameters have to deal with various factors such as quality and type of materials, requirement tolerance levels of the output product, Environmental conditions like temperature and humidity, etc. Injection molding has been a challenging process for many SME level manufacturers to produce products while meeting the quality requirements at the lowest cost. Most of them are unable to reach the global market in the injection molding industry due to the non-availability of the proper methods to determine the process parameters for injection molding. During production, quality characteristics may differ due to drifting or shifting of processing conditions caused by machine wear, environmental change, or operator fatigue. By determining the optimal process parameter settings productivity and quality will increase while reducing the cost of production.
In this paper, we suggest an Industrial IoT framework that can develop for small- and medium-sized enterprises (SMEs) level industries to optimize their production facility. With the presented framework SME level industries can start to inherit IoT devices into their production floor to manage and monitor production parameters in real-time while improving the quality of the production.
Umplanungslösung für CAM-Systeme
Authors: Brecher Christian , Ochel Janis , Königs Michael , Chittem Sriram , Fey Marcel 
Published: December 2020

AbstractDie Problematik kurzfristiger Umplanungen entlang der Produktion mittels CNC-Maschinen gewinnt besonders vor dem Hintergrund zunehmender kundenindividueller Fertigungen in kleinen Losgrößen an Bedeutung. Der aktuell praktizierte Ablauf zur Umplanung auf alternative Maschinen bedingt großen zeitlichen Mehraufwand und fehlende Flexibilität der Fertigung. In diesem Beitrag wird daher ein Ansatz vorgestellt, der eine Ad hoc-Generierung von CAM-Programmierungen für alternative CNC-Maschinen ermöglicht.
Predictors of fast and ultrafast shunt failure in pediatric hydrocephalus: a Hydrocephalus Clinical Research Network study
Authors: Hauptman Jason S. , Kestle John , Riva-Cambrin Jay , Kulkarni Abhaya V. , Browd Samuel R. , Rozzelle Curtis J. , Whitehead William E. , Naftel Robert P. , Pindrik Jonathan , Limbrick David D. , Drake James , Wellons John C. , Tamber Mandeep S. , Shannon Chevis N. , Simon Tamara D. , Pollack Ian F. , McDonald Patrick J. , Krieger Mark D. , Chu Jason , Hankinson Todd C. , Jackson Eric M. , Alvey Jessica S. , Reeder Ron W. , Holubkov Richard , _ _ 
Published: December 2020

OBJECTIVEThe primary objective of this study was to use the prospective Hydrocephalus Clinical Research Network (HCRN) registry to determine clinical predictors of fast time to shunt failure (≤ 30 days from last revision) and ultrafast time to failure (≤ 7 days from last revision).METHODSRevisions (including those due to infection) to permanent shunt placements that occurred between April 2008 and November 2017 for patients whose entire shunt experience was recorded in the registry were analyzed. All registry data provided at the time of initial shunt placement and subsequent revision were reviewed. Key variables analyzed included etiology of hydrocephalus, age at time of initial shunt placement, presence of slit ventricles on imaging at revision, whether the ventricles were enlarged at the time of revision, and presence of prior fast failure events. Univariable and multivariable analyses were performed to find key predictors of fast and ultrafast failure events.RESULTSA cohort of 1030 patients with initial shunt insertions experienced a total of 1995 revisions. Of the 1978 revision events with complete records, 1216 (61.5%) shunts remained functional for more than 1 year, and 762 (38.5%) failed within 1 year of the procedure date. Of those that failed within 1 year, 423 (55.5%) failed slowly (31–365 days) and 339 (44.5%) failed fast (≤ 30 days). Of the fast failures, 131 (38.6%) were ultrafast (≤ 7 days). In the multivariable analysis specified a priori, etiology of hydrocephalus (p = 0.005) and previous failure history (p = 0.011) were independently associated with fast failure. Age at time of procedure (p = 0.042) and etiology of hydrocephalus (p = 0.004) were independently associated with ultrafast failure. These relationships in both a priori models were supported by the data-driven multivariable models as well.CONCLUSIONSNeither the presence of slit ventricle syndrome nor ventricular enlargement at the time of shunt failure appears to be a significant predictor of repeated, rapid shunt revisions. Age at the time of procedure, etiology of hydrocephalus, and the history of previous failure events seem to be important predictors of fast and ultrafast shunt failure. Further work is required to understand the mechanisms of these risk factors as well as mitigation strategies.
Geophysical Investigations of United States Revolutionary War Era (1777–1778) Mass Burial Sites in Pennsylvania, USA
Authors: Sherrod Laura , Willever Heather , Shollenberger Kim , Potter Corey , Thorne Roger , Kline Ann 
Published: December 2020

The United States Revolutionary War (1775–1783) resulted in numerous mass burials in the eastern United States, with deaths occurring not just directly related to the battles fought, but also from disease, starvation, and exposure. Current information relating to these mass burials is often gathered from myths and rumors, leaving the truth of the historical aspects of that time period ambiguous. Geophysical techniques are increasingly utilized in archaeologic and forensic studies to locate unmarked burials. GPR, magnetics, and electrical resistivity have been used to successfully identify burial locations around the world in a non-invasive manner. This paper aims to illustrate how different burials of the US Revolutionary War period can be detected and characterized with geophysics, providing important knowledge of a better historical understanding of that time period, as well as optimizing equipment instrumentation and processing procedures for such targeted investigations. Three case studies of Revolutionary War Era mass burial sites in Pennsylvania, USA are described here: the Paoli Battlefield Memorial, the Old Charlestown Cemetery, and Saint Peter's Church in the Great Valley. These sites are within 9 km of each other and have historic records that suggest mass burials during this period. Results show GPR to provide the most useful data overall, with supporting information gathered from the supplemental geophysical techniques of magnetometry and resistivity. 2D profiles tend to provide a more valuable image of the subsurface than 3D slices. Larger burials leave a greater footprint and have a higher chance of causing a geophysical disturbance that can be measured more than 200 years after the burial. Soil moisture content and vegetation type can impact quality of results. Study implications demonstrate the challenges and potential usefulness of geophysical techniques to successfully locate and characterize mass burials of this time period.
ЛОКАЛЬНО-АДАПТИВНАЯ ФИЛЬТРАЦИЯ НЕСТАЦИОНАРНОГО ШУМА В ДЛИТЕЛЬНЫХ ЭЛЕКТРОКАРДИОГРАФИЧЕСКИХ СИГНАЛАХ
Authors: Тулякова Наталия Олеговна , Трофимчук Александр Николаевич 
Published: December 2020

The research subject of the article is the methods of locally adaptive filtering of non-stationary (from the point of view of its variance) noise in long-term electrocardiogram (ECG) signals. The goal is to develop locally adaptive algorithms for filtering noise with different a priori unknown levels of variance in real-time for ECG signals recorded with a standard sampling rate of 500 Hz. The tasks to be solved are: to investigate the effectiveness of the developed adaptive ECG filtering algorithms using numerical statistical estimates of processing quality in a wide range of additive Gaussian noise variance variation, to investigate the suppression of real non-stationary electromyographic (EMG) noise, and to analyze the application for normal and pathological ECG signals. The methods are integral and local indicators of the filter quality according to the criteria of the mean square error and the signal-to-noise ratio was obtained using numerical simulation (via Monte Carlo analysis). The following results were obtained: an adaptive method for real-time suppression of non-stationary noise in the ECG is proposed, the one-pass and the two-pass algorithms, and the algorithm with selective depending on the preliminary estimates of noise levels re-filtering have been developed on the method basis. Statistical estimates of the filters' efficiency and analysis of their outputs show a high degree of suppression of the noise with different levels of variance in the ECGs. The distortions absence while processing QRS-complex and high efficiency of suppression of Gaussian and real EMG noise with varying variance are demonstrated. The analysis of the output signals and plots of the local adaptation parameters and the adaptable parameters of the proposed algorithms confirms the high efficiency of filtering. The developed algorithms have been successfully tested for normal and pathological ECG signals. Conclusions. The scientific novelty of the results is the development of a locally adaptive method with noise and signal-dependent filter parameters switching and of the adaptive algorithms based on this method for non-stationary noise reduction in the ECG in real-time. This method does not require time for filter parameters adaptation and a priori information about the noise variance, and it has a high-speed performance in real-time mode.
FUNÇÃO QUADRÁTICA: ANÁLISE DOS FENÔMENOS DE CONGRUÊNCIA E NÃO CONGRUÊNCIA EM ATIVIDADES REALIZADAS POR ESTUDANTES DO 9º ANO DO ENSINO FUNDAMENTAL
Authors: Ferreira Graziele Santos , Pires Rogério Fernando 
Published: December 2020

Este artigo relata os resultados de uma pesquisa de caráter qualitativo que teve por objetivo analisar à luz da Teoria dos Registros de Representação Semiótica a manipulação e a coordenação das representações de função quadrática explicitadas por um grupo de estudantes do 9º ano do Ensino Fundamental. O estudo foi realizado com uma turma de vinte e cinco alunos, dividida em sete grupos, de uma escola da rede pública localizada no sudoeste baiano. No decorrer da pesquisa, os estudantesrealizaram duas atividades envolvendo as noções de função quadrática, cujos resultados foram obtidos a partir da análise dos dados à luz da teoria utilizada, mostrando que os estudantes tiveram facilidade em lidar com as situações que envolviam o fenômeno de congruência, porém, quando tiveram quetratar com a representação algébrica do objeto matemático, a dificuldade esteve presente, mesmo quando a conversão era congruente. As atividades em que os estudantes obtiveram êxito e as conversões eram não congruentes, envolveram situações familiares para eles.