bluuebunny/crossref_metadata_2025_split huggingface dataset:
Post Drill Pore Pressure Prediction for Geo-hazard Assessment of Offset Wells in Hamoru Field
Authors: Ogbamikhumi A. , Hamid-Osazuwa O.M. , Imoru E.A. 
Published: August 2020

Understanding the distribution and variation of subsurface formation pressure is key to preventing geo-hazards associated with drilling activities such as kicks and blow out. To assess and prevent such risk in drilling offset wells in the Hamoru field, prediction of pore pressure was done to understand the pressure regime of the field using well logs in the absence of seismic data. Two commonly used methods for formation pressure prediction; Bower’s and Eaton’s methods were adopted to predict pore pressure and determine the better of the two methods that will be more suitable for the field. The cross-plot of Vp against density disclosed that compaction disequilibrium is the prevalent overpressure mechanism. The prediction of Pore pressure with Eaton’s method gave results comparable to the acquired pressure in the field, typical of what is expected when compaction disequilibrium is the dominant overpressure mechanism. Since the result of Bower’s method over estimated formation pressure, Eaton’s method appears to be the better choice for predicting the formation pore pressure in the field. Analysis of the predicted pore pressure reveals the onset of overpressure at depth of 2.44 km. The formation pressure gradient ranges from 10.4 kPa/m to 15.2 kPa/m interpreted as mild to moderately over pressure.
Keywords: Geohazard, over-pressure, Eaton’s method, Bower’s method, normal compaction trend
Comparative Analysis of Properties of Particleboards Made from Corn Cobs at Varying Proportions of Clay Soil
Authors: Aina K.S. , Falemara B.C. , Ebeniro D.S. 
Published: August 2020

Particles of dried corn cobs were employed for manufacture of cement bonded particleboards. Two types of clay soil (red and white) were used as supplement with cement to manufacture cement bonded particleboards. The production of the boards was done at varying proportions of 50/50/0, 50/40/10, 50/30/20, 50/20/30, 50/10/40 and 50/0/50 for (corn/cement/clay) in weight to weight basis while the other considerable production factors like nominal density and curing agent percentage remained constant at 1.30 g/cm3 and 3%. The chemical composition of the soil such as pH, organic carbon, organic matter, total nitrogen, and exchangeable bases were determined. Its impact on physical and mechanical properties such as density, water absorption, thickness swelling, modulus of rupture and modulus of elasticity were also investigated The results of the analysis of variance shows that all considerable production factors for the cement bonded particleboards were significant at 5% level of probability except clay soil type for density. The results show that cement bonded particleboard made of red clay soil with higher content of exchangeable bases proves better outstanding performance in density, strength and dimensional properties than the white clay soil. Among the cement bonded particleboards made at varying proportions. It was discovered that boards of 50/20/30 (corn/cement/clay) had better strength properties than others. Also, the boards made at the proportions of 50/40/10, 50/10/40 and 50/30/20 (corn/cement/clay) were better dimensionally stabled in moisture exposure but weak in strength. The outcome of this study may serve as a guideline for any manufacturer who intends to use clay soil as supplement for production of particleboards.
Keywords: Cement, particleboard, clay soil, corn cobs, strength, variance
Design analysis of a microcontroller based Irrigation system
Authors: Okandeji A.A. , Olajide M.B. , Ponnle A.A. , Kuponiyi D.S. 
Published: August 2020

This work considers the design analysis of a low-cost microcontroller-based irrigation controller capable of managing irrigation for a small area of land based on real-time values of soil moisture and temperature. The method employed is to continuously monitor the soil moisture level to decide whether irrigation is needed, and how much water is needed in the soil. In particular, the microcontroller based circuit device performs the action of irrigation management. Specifically, it does this by continuously monitoring the moisture content of the soil, and comparing the values with two set reference values; the upper-limit, and lower-limit moisture content values, and then induces the corresponding action required. When the soil moisture content goes below the lower-limit value set by the user, the system observes this and begins irrigation action. Results obtained show that this design is cost-effective, and guarantees efficient water supply and effective labor management. Also, irrigation test results show that the duration of spray largely depends on the soil texture, grass identity and moisture content. In particular, sprinkler irrigation method in loamy soil took longer than in sandy soil, while clay soil irrigation took the longest time.
Keywords: Automatic-Irrigation Controller, Irrigation, Microcontroller, Water-supply
<i>Phoenix dactylifera, Cyperus esculentus, and Cocos nucifera</i> Pooled Extracts Ameliorate Pesticides-induced Hormonal Toxicity and Maintains Testicular Histology in Rats
Authors: Ogeyemhe B.E. , Achukwu P.U. , Odigie E.B. 
Published: August 2020

Male infertility is increasingly worrisome and has been linked to increase rate of hormonal toxicity and imbalance. Sufferers now result to using medicinal plants due to its availability and cost effectiveness. This study was to assess ameliorating effects of Phoenix dactylifera (date), Cyperus esculentus (tigernut) and Cocos nucifera (coconut)mixture on pesticides-induced hormonal toxicity in male Wistar rats. Aqueous extraction of crops - date (maceration apparatus), tiger nut (rotary evaporator) and coconut (spray drying process) wereconducted after which, 5g of each extract were mixed in equal proportion. Hormonal toxicity was induced in rats using Ochratoxin A and endosulfan before oral treatment of the mix at graded doses (250 to 1000 mg/kg/day) for 28 days. Aseptic bloodsample was obtained before and after treatment for hormonal assay. At termination, animals were euthanized via decapitation; organs were excised, processed histologically, stained with H&E, and testes examined microscopically. Hormonal toxicity in rats was successfully induced, body weight of highly treated rats reduced (P ≤ 0.02) while testicular weight increased insignificantly (P ≥ 0.05). Mixed extract ameliorated the effect of pesticides on testosterone levels in group: B (1.8 ± 0.5ng/dL), C (2.4 ± 0.4ng/dL), D (3.8 ± 0.6 ng/dL) and E (4.1 ± 0.3 ng/dL) including FSH and LH values (P ≤ 0.05). Stained sections of testis were in keeping with normal histology after investigations. High doses of extract mix successfully reversed pesticides-induced hormonal toxicity in rats without harming the testes.
Keywords: Cocos nucifera, Coconut, Cyperus esculentus, Date, Hormonal imbalance, Pesticide, Phoenix dactylifera, and Tiger nut
Môi Trường Lạm Phát Và Truyền Dẫn Tỷ Giá Hối Đoái Ở Việt Nam
Authors: Nghiệp Quách Doanh 
Published: August 2020

Nghiên cứu này sử dụng phương pháp Hồi quy chuyển tiếp trơn (Smooth transition regression - STR) nhằm tìm kiếm bằng chứng về mức độ truyền dẫn tỷ giá hối đoái vào lạm phát phụ thuộc vào môi trường lạm phát ở Việt Nam. Nghiên cứu tìm thấy ngưỡng lạm phát có ý nghĩa thống kê là 1,5%/tháng chia nền kinh tế thành hai trạng thái lạm phát cao và lạm phát thấp. Kết quả từ
nghiên cứu cho thấy tồn tại mối quan hệ phi tuyến giữa môi trường lạm phát và mức độ truyền dẫn tỷ giá, theo đó cả trong ngắn hạn lẫn dài hạn, mức độ truyền dẫn sẽ cao hơn khi nền kinh tế đang trong trạng thái lạm phát cao và ngược lại. Ngoài ra nghiên cứu còn cho thấy mức độ truyền dẫn có tương quan cùng chiều với độ bất ổn trong lạm phát.
Effects of Cigarette Smoking on Total and Salivary Cortisol Levels
Authors: ELBÜKEN Gülşah 
Published: August 2020

Aim: Although there are some studies regarding the effects of cigarette smoking on serum total cortisol (TC) and salivary cortisol (SaC) levels, the results are still not conclusive. For this purpose, we aimed to determine the effects of cigarette smoking on TC and SaC levels in a small sample of healthy volunteers.
Study design: Twenty-five (12 females and 13 males) smokers with a mean age of 42.6± 15 years and 25 (12 females and 13 males) age- and gender-matched healthy non-smokers (mean age:40.8± 14.5 years) were enrolled in the study. Hypothalamic-pituitary-adrenal (HPA) axis was evaluated by baseline TC and SaC levels, and TC and SaC responses to standard dose (250 µg) ACTH stimulation test. TC and SaC levels were obtained under baseline and stimulated conditions.
Results: Although mean TC and SaC levels were higher in smokers versus non-smokers, a statistically significant difference was not found between the two groups.
Conclusion: TC and SaC levels were not statistically different between smokers and non-smokers. Further studies with a larger sample size are needed to draw definitive conclusions.
Estudio del Impacto de la Troposfera sobre la Señal de GPS L1 en la ciudad de Riobamba
Authors: Zabala Haro Monica Andrea , Alvarez Jhonny , Ruilova Jomaira , Vinueza Rodrigo 
Published: August 2020

En el presente trabajo se analiza el retardo que sufre la señal GPS durante la transmisión a través del canal de propagación el mismo que es afectado por factores, características y condiciones de las capas de la atmosfera. La troposfera debido a las componentes húmedas y secas produce el retardo hidrostático el cual representa aproximadamente el 90% del retardo total de la señal que depende directamente por la presión atmosférica y el retardo troposférico el que se ve influenciado por el vapor de agua y la temperatura. Para la estimación del retardo se opta por la muestra de los datos de los días con mayor y menor humedad y precipitación acumulada basado en el modelo de Saastamoinen comparando los resultados con los datos analizados extraídos de la estación EREC de la Red de Monitoreo Continuo GNSS de Ecuador (REGME) a traves del procesamiento de los datos con la herramienta RTKlib para valorar el impacto en la precisión de la solución final en el posicionamiento del receptor.
Presiones plantares, en estática bipodal, en niños/adolescentes con síndrome de Down
Authors: Meléndez C. , Villarroya M.A. , Moros T. , Maza V. , Casajús J.A. 
Published: August 2020

Objetivo: Determinar las presiones plantares en estática bipodal y la alineación de retropié y rodilla, en niños/adolescentes con Síndrome de Down (SD), comparando los datos con los de un grupo control (GC). Diseño. 32 sujetos con SD y 33 control. Se valoró la superficie plantar, presión media y máxima y su distribución porcentual en 9 zonas de la superficie plantar (plataforma”Footchecker”) en estática bipodal. Asimismo, se valoró la alineación del retropié en el plano frontal y la de la rodilla en los planos frontal y sagital. Resultados. En el grupo SD: superficie plantar mayor (p<0.0001); presión media menor (p<0.01); picos de presión menores en el retropié (zona interna p<0.0001) y mayores en parte interna del mediopié y del antepié (p<0.0001); participación menor del retropié, principalmente en parte interna (GC:23.09%; SD:15.87%; p<0.0001), y mayor de la parte interna del mediopié (GC:4%; SD10%; p<0.0001) y del antepié (GC:12%; SD:17%; p<0.0001). Conclusiones. El grupo SD presentó mayor desviación en valgo de talón y rodilla, tendencia al recurvatum de rodilla y aumento de la superficie de apoyo plantar, relacionado con el pie plano que suelen presentar estos sujetos. Además, presentó tendencia a menores presiones medias y modificación de la distribución porcentual de la carga, con menor participación del retropié y mayor de las zonas internas del mediopié y antepié; es decir, hubo un desplazamiento de la carga hacia la zona ántero-interna.
Objective. To determine the plantar pressures in standing and the hindfoot and knee alignment, in children/adolescents with Down syndrome (DS). Material and Methods. The sample comprised two groups of 32 children / adolescents, one with DS and other without pathology (CG). We analyzed in standing she support surface, average and peak plantar pressures and their distribution (by means of a Footchecker platform), hindfoot alignment in the frontal plane and knee alignment in the frontal and sagital planes.Comparison between both groups was carried out. Results. The DS group showed: higher plantar surface (p<0.0001); lower average pressure (p<0.01); lower peak pressure in the hindfoot (internal zone p<0.0001) and a higher one in the internal zone of the midfoot and forefoot (p<0.0001); lower involvement of the hindfoot, specially in the internal part (CG:23.09%, DS:15.87%, p<0.0001) and a higher one of the internal part of the midfoot (CG:4%, DS:10%, p<0.0001) and forefoot (CG: 12%, DS: 17%, p <0.0001). Conclusions. The DS group presented higher valgus deviation of the hindfoot and knee, a tendency to a knee recurvatum and higher support surface, related to the flatfoot they usually had. On the other hand, they presented a tendency to lower average pressures and a variation in the porcentage distribution of load, with a lower involvement of the hindfoot and a higher one of the internal parts of the midfoot and forefoot: that’s to say, there was a load displacement towards the anterior and internal zone.
Valoración de las repercusiones cinemáticas en la extremidad inferior del antepié varo, en niños entre 7 y 10 años
Authors: Villarroya M.A. , Franco M.A. , Alonso A. , García I. , Calvo B. 
Published: August 2020

El objetivo del estudio fue determinar las repercusiones cinemáticas del antepié varo (AV) en un grupo de niños de 7-10 años, tanto en estática como durante la marcha.
Población: 30 niños con AV (9.3 ± 1.7 años; 6.1º ± 2.3º de AV), 21 niños control (GC) (9.2 ± 1.6 años). Se utilizaron los modelos “Oxford Foot” y “Plug-In-Gait” para analizar la cinemática, en estática y durante la marcha, en los 2 grupos (Sistema VICON, 6 cámaras). Para comparar todas las variables entre los dos grupos, se aplicó el t-test para muestras independientes, cuando los datos eran normales, y el test de Mann Whitney cuando no lo eran.
En estática, el grupo AV presentó mayor eversión del retropié, descenso del arco longitudinal interno y una actitud en flexión de toda la extremidad inferior. Al caminar, este grupo presentó mayor eversión del retropié y aplanamiento del arco interno en todas las fases de la marcha analizadas; proximalmente, se observó mayor báscula anterior de la pelvis y flexión de las 3 grandes articulaciones de la extremidad inferior y mayor rotación externa de cadera. No existieron diferencias en la velocidad de la marcha, pero, para conseguir esta velocidad, el grupo AV necesitó mayor cadencia y una longitud y una duración de paso menor.
The aim of this study was to determine the impact of the forefoot varus (FV) on the kinematics of the lower limb, in standing and during walking, in a group of children aged between 7 and 10 years. The Oxford Foot Model was used, simultaneously with a conventional lower limb model, to compare the kinematics of 10 forefoot varus children (9.3 ± 1.7 years; 6.1º ± 2.3º of FV) and 11 healthy controls (9.2 ± 1.6 years). Data acquisition was performed using a six-camera motion capture system. The independent t- test was used to compare normal data and the Mann-Whitney test to compare non-normal data.
In standing, the FV group showed a higher hindfoot eversion, a lower height of the internal longitudinal arch and a higher flexion in the 3 main joints of the lower limb. During walking, this group presented a higher hindfoot eversion and a lower height of the internal longitudinal arch in all the studied phases; on the other hand, a higher pelvis anterior tilt, a higher flexion of the 3 main joints of the lower limb and a higher external rotation of the hip were found. There were no differences in the gait speed but, to achieve this speed, the FV group needed a higher cadence, due to a lower length and duration of the step.
Correlación entre fuerza explosiva y velocidad en jóvenes futbolistas
Authors: Frazilli E.H. , de Arruda M. , Mariano T. , Cossio Bolaños M.A. 
Published: August 2020

El objetivo del presente estudio fue determinar las relaciones entre la fuerza explosiva y la velocidad V(20m) en futbolistas cadetes y juveniles. Para el estudio fueron evaluados 18 jugadores de la categoría infantil y 18 de la categoría juvenil, siendo un total de 36 futbolistas. Se evaluó el peso corporal (kg), estatura (cm) y el % de grasa corporal. Así como también los test de squat Jump SJ(cm), CounterMovement Jump CMJ(cm) y saltos verticales contínuos en 5 segundos CJ5s(cm).
Los resultados muestran altas correlaciones entre SJ y CMJ (0,80), SJ y V(20m) ( 0,71) y CMJ y V(20m) (-0,61) en cadetes, así como en juveniles SJ y CMJ (0,89) y SJ y V(20m) (-0,62), respectivamente. Por lo tanto, se concluye que la fuerza explosiva se encuentra en estrecha relación con la velocidad (20m), tanto en jugadores de la categoría cadetes y juvenil.
The aim of this study was to determine the relationship between the explosive power and speed V(20m) in children and youth players. For the study were evaluated 18 players in the cadet’s category and 18 in the youth category, for a total of 36 players. We assessed body weight (kg), height (cm) and% body fat, as well as the squat jump test, SJ (cm), countermovement jump CMJ (cm) and continuous vertical jumps in 5 seconds CJ5s (cm).
The results show high correlations between SJ and CMJ (0.80), SJ and V(20m) ( 0.71) and CMJ and V (20m) (-0.61) in cadet’s and youth in SJ and CMJ (0.89) and SJ and V(20m) (-0.62), respectively. Therefore, we conclude that the explosive force is closely related to the speed (20m), both players of the cadets and youth category.
Desórdenes de la locomoción, a dos velocidades de paso, en pacientes con fibromialgia
Authors: Heredia Jiménez J.M. , Soto Hermoso V.M. 
Published: August 2020

El objetivo del presente estudio es analizar si hay diferencias en las variables espaciotemporales de locomoción entre las pacientes afectadas con fibromialgia (FM) y un grupo de mujeres sanas, analizadas a velocidad confortable y rápida. Se evaluaron a 55 mujeres con FM y 44 sanas. El análisis de la locomoción se realizó con una plataforma de presiones (GaitRite system) y los sujetos realizaron una prueba a velocidad confortable y otra a velocidad rápida. Diferencias significativas (p<0.001) fueron encontradas entre el grupo control y el grupo FM en las variables de velocidad, longitud de paso, cadencia, fase de apoyo monopodal, fase de apoyo bipodal, fase de oscilación y fase de apoyo en las dos condiciones analizadas. No encontramos diferencias significativas entre las pacientes con FM caminando rápido y el grupo control a velocidad confortable, excepto en la cadencia. Los parámetros de locomoción en mujeres con FM están severamente afectados al compararlo con el grupo control, debido a diversos factores como la bradicinesia, la falta de actividad física, el sobrepeso, la fatiga y el dolor, que junto con una menor fuerza isométrica de las extremidades inferiores, pueden ser las responsables de estas alteraciones en la locomoción y en el descenso de la calidad de vida de estas pacientes.
The aim of the present study was to determine if there are differences in spatiotemporal parameters among patients affected by fibromyalgia (FM) and healthy subjects, assess at comfortable and quickly speed of locomotion. We studied 55 women with FM and 44 controls. Gait analysis was performed using an instrumented walkway for measurement of the kinematic parameters of gait (GAITRite system), and the subjects was assessment in two conditions, comfortable and fast gait speed. Significant differences (p<0.001) between FM and control groups were found in velocity, stride length, cadence, single support ratio, double support ratio, stance phase ratio, and swing phase ratio at both analysis conditions. There aren’t statistical differences between FM group walking at quick speed and control group walking at comfortable speed, except in cadence variable. Gait parameters of women affected by FM were severely impaired when compared to those of healthy women. Different factors such as lack of physical activity, bradikinesia, overweight, fatigue, and pain together with a lower isometric force in the legs can be responsible for the alterations in gait and poorer life quality of women with FM.
Preparación de mallas mediante electrohilado para la inhibición de la angiogénesis
Authors: García-Fernández L. , Aguilar M.R. , Migliaresi C. , San Román J. 
Published: August 2020

La preparación de nanofibras por electrohilado está ganando mucho interés en la actualidad debido a su posible aplicación como sistemas de liberación controlada de fármaco. La incorporación del compuesto activo en la matriz polimérica de las fibras permite su protección frente a los procesos degradativos del organismo y su liberación controlada y localizada.
Numerosas enfermedades (psoriasis, retinopatías diabéticas, crecimiento de tumores) están relacionadas con alteraciones en la angiogénesis (formación de nuevos vasos sanguíneos a partir de otros ya formados), por tanto el desarrollo de nuevos compuestos que regulen adecuadamente los procesos angiogénicos se está estudiando como una posible vía en el tratamiento de estas enfermedades. En el presente trabajo se han preparado y caracterizado nanofibras de ácido poli(D,L-láctico) cargadas con ácido 5-amino-2-naftalensulfónico o el homopolímero del ácido 2-acrilamido-2-metilpropanosulfónico, compuestos inhibidores de la acción de algunos factores de crecimiento proangiogénicos dependientes de heparina.
La distinta naturaleza de los compuestos activos utilizados permitieron la obtención de diferentes perfiles de liberación, dependientes de la hidrofilia del compuesto activo, su peso molecular y la biodegradabilidad del ácido poli(D,L-láctico). Ambos sistemas mostraron una alta capacidad para inhibir la mitogénesis de fibroblastos inducida por aFGF.
Preparation of nanofibers by electrospinning is gaining much attention due to their potential application as drug delivery systems. The incorporation of the active compound in the polymeric matrix of the fibers prevents degradation and allows a controlled and localized delivery of the drug.
Many diseases (psoriasis, diabetic retinopathy, tumor growth) have been related to alterations in the angiogenic processes, therefore the control of angiogenesis is being investigated as a possible treatment for these diseases. In this work poly(D, L-lactic acid) nanofibers loaded with sulfonated active compounds that inhibit heparin-dependent proangiogenic growth factors (5-amino acid-2-naphthalene sulfonic acid and poly(2-acrylamido-2-methylpropane sulfonic acid) have been prepared and characterized.
The different nature of the active compounds gave rise different release profiles that depended on the hydrophilic nature of the drug, molecular weight, and the biodegradation of poly (D, L-lactic acid). Both systems showed a high inhibition of fibroblasts aFGF- induced mitogenesis.