bluuebunny/crossref_metadata_2025_split huggingface dataset:
Penggunaan Multimedia Interaktif Berbasis Computer Assisted Instruction (CAI) pada Topik Pembahasan Baja Sebagai Bahan Bangunan
Authors: Abdi Muchlis , Bachtiar Gina , Daryati Daryati 
Published: January 2019

Tujuan penelitian ini dirancang untuk mengetahui perbedaan hasil belajar menggunakan CAI berbasis multimedia interaktif dengan media pembelajaran berbasis Powerpoint pada pembahasan topik baja sebagai bahan bangunan di Program Studi Pendidikan Teknik Bangunan Universitas Negeri Jakarta dan membantu siswa dalam memahami pembahasan topik tentang baja sebagai bahan bangunan dalam kursus ilmu material.
Penelitian ini adalah Pre-test Penelitian Eksperimen Benar - Post-test Design. Metode yang digunakan adalah metode eksperimental. Divalidasi oleh ahli konten media instruksional dan ahli media untuk mendapatkan uji coba kelayakan. Selanjutnya, instrumen tes diujikan pada mahasiswa Program Studi Pendidikan Teknik Bangunan tahun 2014. Setelah itu dilakukan uji lapangan kepada mahasiswa Pendidikan Program Studi Teknik Bangunan angkatan 2016. Analisis data menggunakan T-test dua sisi sampel independen melalui program SPSS V17.
Hasil penelitian ini berarti bahwa kelas eksperimen memperoleh selisih rata-rata hasil belajar (pre-test dan post-test) sebesar 33,18 dan mengalami peningkatan sebesar 16,59%. Sedangkan kelas kontrol memperoleh selisih rata-rata hasil belajar (pre-test dan post-test) sebesar 23,64 dan mengalami peningkatan sebesar 11,82%. Selanjutnya, uji-T dua sisi sampel independen dilakukan dengan memperoleh hasil uji 0,027 <0,05. Jadi dapat disimpulkan perbedaan hasil belajar penggunaan multimedia interaktif berbasis CAI lebih besar dari penggunaan media pembelajaran berbasis Powerpoint pada selisih rata-rata hasil belajar siswa pada pembahasan topik baja sebagai bahan bangunan pada siswa Pendidikan Program Studi Teknik Bangunan Universitas Negeri Jakarta.
Trend Penelitian Pendidikan Dan Kemampuan Menyusun Skrpsi Mahasiswa Fakultas Teknik Universitas Negeri Jakarta
Authors: Iriani Tuti 
Published: January 2019

Penelitian ini bertujuan untuk memperoleh data trend penelitian yang telah dilakukan oleh mahasiswa di prodi kependidikan di FT UNJ selama kurun waktu 3 tahun terakhir serta mengetahui kemampuan mahasiswa dalam menyusun skripsi. Populasi yang digunakan dalam penelitian ini adalah skripsi pendidikan dari 4 jurusan yang terdapat di FT UNJ khususnya program studi pendidikan. Pengambilan sampel yang dilakukan berdasarkan purposive sampling yaitu skripsi penelitian pendidikan tahun 2013 â€“ 2015. Metode penelitian yang digunakan adalah deskriptif kualitatif dengan melakukan analisis isi secara sistematis terhadap dokumen-dokumen sebagai sumber data. Hasil penelitian menunjukan bahwa trend penelitian pendidikan mahasiswa FT lebih di dominasi dengan tema media pembelajaran dan hasil belajar. Metode penelitian yang banyak digunakan adalah R & D dan Quasi Eksperimen. Kemampuan mengidentifikasi masalah, kesinambunan antara bab per bab belum menunjukan relevansi karena belum dilengkapi dengan analisa ataupun justifikasi yang lengkap, penggunaan teori dan konsep, pemilihan metode penelitian dan pemilihan subjek dan obyek serta pengumpulan data, menggunakan penulisan ilmiah dengan kaidah yang benar sampai kepada daftar pustaka diperlukan bimbingan yang intens dari dosen pembimbing.
Using Land Controlled Source Electromagnetics to Identify the Effects of Geologic Controls During a Zipper Frac Operation - A Case Study from the Anadarko Basin
Authors: Hickey Mark , Vasquez Oscar , Trevino Santiago , Oberle Justin , Jones Drew 
Published: January 2019

Abstract
Controlled Source Electromagnetics (CSEM) is used to monitor and image a three well zipper frac operation. We examine the interaction between the completions operation and a fault zone at reservoir depth.
Using two grounded dipole transmitter lines and 350 receiver locations, 27 frac stages were monitored in the Anadarko basin for three horizontal wells. Our broadband signal is transmitted before the start of the frac stage, during the frac stage, and after the frac stage is completed. This allows us to establish a baseline image prior to the start of the frac stage and to generate a response throughout the frac. The electromagnetic data collected provides a direct measurement of the conductivity change in the subsurface caused by the hydraulic fracturing process and from this we infer fluid movement.
This case study presents the effects of a fault at reservoir depths that is intersected by the three wells and examines the possible effects of formation heterogeneities on frac fluid migration. Images produced by our CSEM method illustrate the lateral extent of the fluid, fracture azimuth, and identify reservoir heterogeneities. In addition, unlike microseismic, the CSEM method records signal generated from fluid flow in natural fractures as well as those fractures created by hydraulic pressure. As a result, CSEM allows us to infer fluid propagation and location to gauge frac behavior near and away from the fault where the fault zone is seen possibly acting as a sink and barrier. CSEM monitoring of a frac operation not only serves as a tool for monitoring and fracture diagnostic, it can also be used to identify geologic controls that can affect reservoir stimulation.
Improved Completion Economics Through Real-time, Fiber Optic Stimulation Monitoring
Authors: Stark P. F. , Bohrer N. C. , Kemner T. T. , Magness J. , Shea A. , Ross K. 
Published: January 2019

Abstract
This paper demonstrates how a single permanent fiber installation allowed the development of improved completions designs in real time in order to improve well economics. Design changes were adjusted during the completion of the well to determine stage length and completion execution. Improvements were applied to the subsequent wells in the program.
In 2018, an eight-well pad was completed with the intention of immediately drilling and completing a second directly offset eight-well pad. Further options for additional wells would be evaluated based on the performance of these sixteen wells. The laterals of the project wells were arranged in a wine-rack configuration targeting zones in the Upper and Lower Eagle Ford Formation. Initial designs were based on analytics from the area resulting in an initial design for cluster spacing, stages per cluster, injection rates and volumes, and fluid volumes. The primary goal of the diagnostics expenditure was to improve the dollars per barrel relationship, specifically by increasing stage lengths that could be effectively completed along the lateral wellbore.
The project included a casing-installed fiber optic cable to record the distributed acoustics and distributed temperature along the wellbore for, respectively, stimulation flow profiles and production flow profiles. Acoustic-based flow profiles were generated during the project and evaluated to influence the next set of stage designs. These design changes involved among other variables adding clusters to the stage, sand staging, and rate adjustments,
At the end of the project, completions changes resulted in a reduced individual well cost of 11%. Production profiling began to compare stage designs along the lateral and to confirm baseline well performance versus its peers. In both cases, those results confirmed that the design changes lowered the overall cost while maintaining well performance.
Simulation and Analysis of Fracture Swarms Observed in the Eagle Ford Field Experiment
Authors: Sesetty Varahanaresh , Ghassemi Ahmad 
Published: January 2019

Abstract
Coring adjacent to a hydraulically fractured horizontal well in Eagle Ford shale by Conoco-Phillips has revealed several closely spaced parallel hydraulic fractures (separated only by few inches) propagating in the direction perpendicular to the wellbore axis. The number of observed hydraulic fractures greatly exceed the number of clusters according to the recent paper titled "Sampling a Stimulated Rock Volume: An Eagle Ford Example". The observed behavior is contrary to the conventional practice of hydraulic fracture modeling where often a single fracture from each perforation cluster. This assumption stems from a simplified concept of the stress shadow that inhibit the growth of multiple parallel fractures under very tight spacing. In this study we show that correct modeling can in fact capture the field observed fracture clusters or swarms of closely-spaced fractures.
Numerical model based on displacement discontinuity method is used to simulate non-planar hydraulic fracture propagation. Fracture deformation, fluid flow and perforation friction are fully coupled. Fracture propagation from a single cluster consisting of 20 perforations under 1800 phasing spanning 5 ft is considered. The effect of controlling parameters such as far-field stress contrast, perforation properties, and fracture toughness on multiple hydraulic fracture growth from a cluster of perforations is studied.
The results show that closely spaced fracture clusters or swarms can occur for a certain range of conditions and operational parameters. The in-situ stress contrast, perforations conditions, and injection rates exert a significant influence. Under the right conditions, closely-spaced fractures can extend to distances exceeding tens of feet from the wellbore. Early termination and/or coalescence of closely spaced fractures can also occur.
To our knowledge, our modeling results are the only ones that can explain the data from the Conoco-Phillips field observations regarding the occurrence of fracture swarms. The resuts show that the assumption of a single fracture per cluster does not hold true under all conditions. Moreover, such assumption would significantly underestimate stimulated rock volume near the wellbore. Finally, our results capture the injection pressure data which can be used as a diagnostic tool to infer the perforation effectiveness (i.e., the number of perforations that are in contact with fluid flow).
Evolving Completion Designs to Optimize Well Productivity from a Low Permeability Oil Sandstone Turner Reservoir in the Powder River Basin—One Operator's Experience
Authors: Agarwal Karn , Kegel Justin , Ballard Bryce , Lolon Ely , Mayerhofer Michael , Weijers Leen , Melcher Howard , Compton Sarah , Turner Paul 
Published: January 2019

Abstract
As the Powder River Basin (PRB) development continues and more wells are drilled, identifying best completion practices is critical to economic success. This operator has completed several Turner horizontal wells drilled at 10,300-11,000 ft TVD using crosslinked gel with encouraging results. Although reservoir quality varies in the basin, the Turner interval is more than 30 ft thick in the area of interest (AOI) in Campbell County, Wyoming. In this area, production history matched permeability ranges from 0.005 to 0.1 mD, with pore pressure gradient from 0.55 to 0.64 psi/ft. Fracture modeling and production history matching/sensitivities were performed on a few horizontal wells. This paper discusses the results of this modeling and history matching, and it summarizes the evolution of Turner Formation fracture treatment designs, that were done by one operator to maximize the return on investment.
The operator collected core data, open hole logs, and Diagnostic Fracture Injection Test (DFIT) data. The objectives of this study were to: a) determine reservoir parameters from DFIT, b) estimate fracture height growth, fracture half-length, and conductivity for Turner crosslinked gel fracs, c) determine the most appropriate perforation cluster or fracture spacing, as well as treatment rate, fluid/proppant loading, and proppant types/sizes based on the expected long-term production performance, d) compare the estimated production of cemented sleeve vs. plug-and-perf completions, and e) perform multivariate analysis of public production and completion data to compare with the detailed physical modeling.
The results presented in this paper show well-performance predictions as a function of sleeve/perforation cluster spacing, treatment size, proppant type, mesh size, and pump rate. Implications for implementation of a certain treatment and completion design are discussed in detail.
Wellbore Placement Optimization Using Particulate Oil-Soluble Tracers
Authors: Jones Marcus , LaRue Jon 
Published: January 2019

Abstract
Operators working with multiple stacked-pay reservoirs are challenged to optimize economic returns through their completion designs - not only in regards to horizontal well spacing, but also with vertical well spacing. Many of the popular Texas and New Mexico Wolfcamp formation sections exceed 1,000 feet in thickness and contain multiple hydrocarbon-rich benches. These benches and associated strata are complex mixtures of heterogenic geological factors such as weak/strong structural interfaces between facies, open/healed natural fractures, unpredictable fluid and pressure regimes, along with other lithological variables. Companies wrestle with the optimization of maximum hydrocarbon recovery within ever-present economic constraints when developing reservoir targeting strategies.
This case study used multiple solid, oil-soluble tracers (OSTs) as an aid in reservoir characterization to determine optimal landing zones in the two unique Wolfcamp formations. This was accomplished by monitoring OST recovery data produced from grouping frac stages and reservoir zones over a 435 sampling day period. The two wells in this case study were intentionally drilled highly toe-up in order to cross all the potentially productive areas in two separate Wolfcamp benches; all stages were completed with the same stimulation design.
The dynamics of the OST recovery provided insight into the variability of reservoir productivity within the Wolfcamp. Particular layers in the two wells exhibited initially high but transient OST recoveries, while other zones produced OSTs longer and more consistently. Using granular level tracer data in conjunction with other geoscience information, the operator was able to identify the formation layers having the highest potential for optimal production economics. This new methodology not only provided single-well placement optimization, but also important insights for future completions.
Short-duration rainfall extremes in Sweden: a regional analysis
Authors: Olsson Jonas , Södling Johan , Berg Peter , Wern Lennart , Eronn Anna 
Published: January 2019

Abstract
We investigate short-duration rainfall extremes in a 22-year long (1996–2017) time series of 15-min values from 128 stations in Sweden. Two different approaches are used to fit extreme value distributions (EVDs) to the data: generalized extreme value distribution with annual maximum values and generalized Pareto distribution with peak-over-threshold values. First, EVDs are fitted to the data from each station, and the extreme value parameters are used together with the station coordinates in a cluster analysis. Based on the clustering results, a division of Sweden into four regions is proposed. Following the station-year method, the time series from all stations in each cluster are pooled into regional series after which depth–duration–frequency (DDF) statistics are calculated. Averaged over durations and return periods, the highest DDF values are found in region south-west, being ∼25% higher than the lowest ones found in the northern region. A six-parameter DDF function is proposed which, together with a simple empirical expression for the associated confidence interval, allows for easy DDF estimation at arbitrary durations and return periods, including uncertainty. No tendencies of change in magnitude or frequency of the short-duration extremes are found during the period.
Study of the dynamic evaluation model of overall hydrological alteration degree based on the RVA and set pair analysis–Markov chain methods
Authors: Zhang Jinping , Zhang Xin , Xiao Honglin 
Published: January 2019

Abstract
The concept of overall hydrological alteration degree in the traditional range of variability approach is no longer suitable for the requirements of the current changing environment. First, by introducing the analytic hierarchy process and including the concept of deviation in the range of variability approach, the traditional range of variability approach is improved. Second, by using the daily flow data from the Guide gauging station in the lower reaches of Longyangxia reservoir from 1954 to 2017 and by combining the concept of connection degree in set pair analysis, a more comprehensive overall hydrological alteration degree is obtained. Finally, based on the results of overall hydrological alteration degree in each period, a dynamic evaluation model of overall hydrological alteration degree is established based on a set pair analysis–Markov chain method. The results show that the overall hydrological alteration degree of the Longyangxia reservoir in the postimpact period is at the second level; its average is −0.43, but its identity tends to increase. Furthermore, the dynamic evaluation model shows that the overall hydrological alteration degree of its stable state will be 0.1726, its impact flow changes and its stable state will be at the third level. This is a positive developing trend.
Taxonomía, distribución geográfica y ecológica del género Penstemon (Plantaginaceae) en la Faja Volcánica Transmexicana, México
Authors: Zacarias-Correa Ana Gabriela , Guzmán-Díaz Salvador , Pérez-Calix Emmanuel 
Published: January 2019

Antecedentes y Objetivos: Penstemon es uno de los géneros más diversos de la familia Plantaginaceae con cerca de 283 especies distribuidas desde Alaska hasta Guatemala. Para México se citan al menos 50 especies; sin embargo, hasta la fecha se conoce muy poco sobre su taxonomía, distribución, diversidad y estado de conservación. Considerando la riqueza, composición y grado de endemismo de la flora de la Faja Volcánica Transmexicana, se piensa que es una región esencial para realizar un primer acercamiento sobre el conocimiento del género Penstemon en México.Métodos: Se analizaron los estudios florísticos de la Faja Volcánica Transmexicana, bases de datos en línea y los tratamientos taxonómicos de Penstemon; se revisaron los ejemplares del género depositados en 12 herbarios del centro de México y se evaluó el estado de conservación de sus especies. Además, se analizaron los patrones de distribución geográfica y ecológica de las especies de Penstemon en la provincia de estudio a través de un análisis biogeográfico cuantitativo.Resultados clave: Se documenta la presencia, y se analizan patrones de distribución, de nueve taxa de Penstemon para la Faja Volcánica Transmexicana. Se enlistan los taxa encontrados, nombres válidos, sinonimias, descripciones morfológicas, estado de conservación y mapas de distribución.Conclusiones: Aunque no se localizó ningún taxón de Penstemon endémico de la Faja Volcánica Transmexicana, es importante señalar que en esta provincia se concentra la mayor parte del área de distribución de cinco de los nueve taxa tratados. Además, se descubrió que la porción oriental de la Faja Volcánica Transmexicana es la región donde se registra la mayor riqueza de especies del género de estudio.
Seguimiento de egresados de la licenciatura en Enfermería de la ENEO en 2000 a los tres años (2003)
Authors: Müggenburg R.V María Cristina , Barreto Plácido Francisco , García Ortíz María Del Rosario 
Published: January 2019

Antecedentes: El seguimiento de egresados de la ENEO ha sido una preocupación constante para la escuela desde hace mucho tiempo, sin embargo a partir de 1991 se estableció como proyecto institucional, llevando a cabo el seguimiento a los tres años de la terminación de sus estudios desde 1994 hasta 2004, En este informe se presenta el caso de 2003.
Propósito: EI propósito de este trabajo es: Conocer la situación laboral de sus egresados: actividades desempeñadas, condiciones laborales, satisfacción, perspectivas de desarrollo, antecedentes educativos y perspectivas de desarrollo, antecedentes personales para retroalimentar el proceso formativo de la carrera y orientar a alumnas y alumnos para su inserción al mercado laboral. Metodología: Estudio longitudinal descriptivo con enfoque cuantitativo. La población correspondió a 339 ex alumnos egresados de la Licenciatura del sistema escolarizado y la muestra encuestada fue de 59 egresados; los datos recabados se orientan al propósito de estudio. Para el análisis de los datos, se utilizaron pruebas de estadística descriptiva. Discusión y Conclusiones: Las características personales, académicas y laborales guardan similitud con otros seguimientos, sin embargo hay datos que lo caracterizan: los índices de titulación continúan recuperando su tendencia positiva, sin embargo, los porcentajes de contratación se ven reducidos en comparación a los seguimientos de 2002 y 2001, Las actividades que realizan con mayor frecuencia los egresados son congruentes con las áreas y con las categorías de contratación. En este seguimiento se destaca la opinión de los egresados en cuanto a la recepción de formación orientada a las actividades educativas de carácter preventivo.
Perfil de riesgo en Diabetes Mellitus tipo 2 de una comunidad semiurbana en la ciudad de México
Authors: Flores Fernández Verónica , González-Juárez Liliana , Ponce Gómez Gandhy 
Published: January 2019

La Encuesta Nacional de Enfermedades Crónicas (2000) en México, identifico un aumento en la prevalencia de diabetes mellitus tipo 2 del 7.2% a 10.9 % en siete anos, por 10 tanto el propósito del estudio fue identificar los factores de riesgo para la diabetes mellitus tipo 2 de las personas de 20 a 69 anos de edad de una comunidad suburbana de la ciudad de México, a fin de realizar un seguimiento longitudinal de los factores de riesgo de personas en estudio.
Se realizo una valoración casa par casa, hasta completar una n = 256 personas del Área Geoestadística Básica
(AGEB) 052-7 que se localizaron en el momento del estudio. EI equipo de trabajo se sometió a un proceso de estandarización para realizar las valoraciones clínicas y aplicar la Cedula de Entrevista Familiar la cual incluye algunos datos tales como; glucosa capilar casual, índice de masa corporal, índice cintura cadera, entre otros, los parámetros de referencia fueron los establecidos por la Organización Mundial de la Salud (OMS), American Diabetes Association (ADA), Comité de Expertos sobre el Diagnostico y Clasificación de la Diabetes Mellitus y el Comité de Unión Nacional de Prevención y Detección de la Hipertensión. EI análisis estadístico se presenta en estadística descriptiva se utilizo el paquete estadístico de SPSS versión 8.0.
Resultados.-. EI 12.5 % refirió tener diagnostico de diabetes y el promedio de anos de diagnostico fue de 7.6 + 6.0 anos. EI 5.5 % obtuvo cifras glucosa capilar casual de ~ 200 mg/di. Se observo un incremento drástico de la glucosa capilar casual en los grupos de edad de 50 a 59 anos y 60 a 69 anos de edad. EI índice Cintura Cadera (ICC) de riesgo para el genera femenino se encontró en el 68.5 % >'84, para el genero masculino el 47.2 % se ubico en > .93.
Es notorio que un gran porcentaje de la poblacion en estudio muestra una tendencia a la obesidad y sobrepeso tan elevadas cifras de IMC e ICC. Se desconoce la incidencia anual de la diabetes mellitus tipo 2, en población abierta, por 10 que se sugiere realizar detecciones anuales.