bluuebunny/crossref_metadata_2025_split huggingface dataset:
Perbedaan Hasil Belajar Matematika Siswa Menggunakan Strategi Active Learning Dengan Cara Giving Questions And Getting Answers Dengan Pembelajaran Konvensional Di Kelas X Sma Ekasakti Padang
Authors: Fitri Yuliani , Refnywidialistuti Refnywidialistuti 
Published: July 2019

The study is a kind of experimental one conducted to two groups, an experimental group and controlled group. The purpose of the study was to figure out whether students’ learning achievement by using giving questions and getting answers of active learning strategy better than those of conventional learning. The finding of the study is supposed to be useful for the researcher in teaching and to be guidance for teachers in mathematics learning. Population of the study were all of the students grade X TP 2017/2018 of Eka Sakti Senior High School, consisting of three classes.The samples were XIS1 as the controlled class consistingof 22 students and XIS2 as the experimental class consisting of 22 students. Data collected by having a test to the experimental class and controlled class. Normality and homogeneity tests were conducted before doing hypothesis test. The students’ learning achievement were normal and homogeny. Based on the analysis of hyphothesis tetsting, it can be concluded that application of active learning strategy by giving questions and getting answers can increase students’ mathematics learning achievement for 95% level of realibility. Therefore, it is hopped that teachers will apply active learning strategy by giving questions and getting answers in teaching learning process of mathematics due to its significant effect to learning achievement of the students.Keywords: learning achievement, active learning, giving questions and getting answers
Penerapan Model Contex Tual Teaching And Learning (CTL) Dalam Pembelajaran Matematika untuk Meningkatkan Kemampuan Pemecahan Masalah Matematis Peserta Didik Kelas VII SMPN 1 Danau Kembar
Authors: Yahya Dianti , Yulia Yulia 
Published: July 2019

Learning model chosen by educators teacher has not been able to accommodate the mathematics problems of students. For that, the Contextual Teaching and Learning (CTL) model was applied. The purpose of research is to collation the mathematical problem solving abilities of students who are using Contextual Teaching and Learning (CTL) learning model and using the ordinary learning model (scientific approach). This type of research is a quasy experiment with randomized control group only design. The population of this study were all students of class VII SMPN 1 Danau Kembar. For to get sample class with random sampling technique. As for the research instrument used in the study is a test of mathematical problem solving students abilities. Based on the results of this avarage mathematical problem solving students abilities experiment class and control class is 80,30 and 73,16. Than the hypothesis testing using the t-test. From calculation result obtained t_count > t_table 2,21 > 1,64) with alpha=0,05 with 95% confidence interval so H0 rejected and accepted H1.Keywords : Mathematical problem solving abilities, Contextual Teaching and Learning (CTL)
Pengaruh Permainan Konstruktif dan Kecerdasan Visual- Spasial Terhadap Kemampuan Matematika Awal Anak Usia Dini
Authors: Warmansyah Jhoni , Amalina Amalina 
Published: July 2019

The purpose of this study was to determine the effect of constructive play and visual-spatial intelligence on early mathematical abilities. The approach used is quantitative through an experimental method with 2x2 treatment by level design. This research was conducted on children in kindergarten group B in the city of Padang. The sampling technique uses Stratified cluster random sampling. The number of samples in this study were 40 children. Data collection in this study used an initial mathematical ability test and a spatial visual intelligence test. The data analysis technique in this study used two-way ANOVA to see the main effects and interactions, then using the Tukey test to see simple effects. The results of this study are as follows: 1) Early mathematical abilities provided with constructive games Lego have a higher influence than constructive games Beams (Fhitung= 5,16 > Ftabe (α=0,05)= 4,04). 2) There is an interaction between constructive play and spatial visual intelligence, in general it has a significant effect on the early math skills of kindergarten children in group B (Fhitung = 13,34 > Ftabel (α=0,05) = 4,04). 3) Early mathematical abilities that have high spatial visual intelligence with given constructive games Lego are higher than the initial mathematical abilities with constructive games (Qhitung = 4,24 > Qtabel (α=0,05) = 3,15). 4) Early mathematical abilities that have low spatial visual intelligence with given constructive games Beams have a higher value than the initial mathematical abilities given by constructive games Lego (Qhitung = -2,30 > Qtabel (α=0,05) = -3,15).
Pembinaan Soft Skill Siswa Melalui Dasadarma dalam Kegiatan Kepramukaan di Gugus Depan 007/008 MAN 1 Padang Panjang
Authors: Ahmad Aprizal , Arsa Anni 
Published: July 2019

Pendidikan sekarang terfokus pada aspek akademik seperti ilmu pengetahuan dan teknologi sementara peningkatan soft skill seperti mengembangkan kepribadian siswa (kemampuan personal) dan kemampuan interpersonal sangatlah kurang. Pramuka sebagai salah satu kegiatan ekstrakurikuler di sekolah sangat relevan dengan pembinaan soft skill yang tertuang dalam dasadarma. Berdasarkan latar belakang tersebut Rumusan masalah pada penelitian ini adalah Bagaimana pembinaan soft skill siswa melalui dasadarma dalam kegiatan kepramukaan di Gugus Depan 007/008 MAN 1 Padang Panjang. Penelitian ini menggunakan metode deskriptif kualitatif. Sumber data dalam penelitian ini adalah siswa, Pembina dan Pelatih Pramuka, Mabigus. Teknik pengumpulan data dilakukan melalui: observasi, wawancara, dan dokumentasi. Hasil penelitian ini pertama, program pembinaan soft skill siswa melalui dasadarma dalam kegiatan kepramukaan dibuat dan dirancang pada Musyawarah Gugus Depan (Mugus) dan rapat kerja Dewan Ambalan yang tertuang dalam program latihan rutin dan tahunan. Kedua, bentuk-bentuk soft skill yang ditanamkan melalui dasadarma diantaranya: Religius, jujur, toleransi, disiplin, kerja keras, kreatif, mandiri, demokratis, semangat kebangsaan, cinta tanah air, bersahabat/komunikatif, peduli lingkungan, peduli sosial, tanggung jawab. Ketiga, metode pembinaan soft skill siswa melalui dasadarma dalam kegiatan kepramukaan yaitu pengamalan kode kehormatan pramuka, belajar sambil melakukan, sistem among, kegiatan yang menarik dan menantang, dilaksanakan di alam terbuka, tanda kecakapan umum, satuan terpisah dan kiasan dasar. Keempat, faktor penghambat dalam pembinaan soft skill melalui dasadarma dalam kegiatan kepramukaan adalah kurang efektifnya waktu kegiatan latihan pramuka serta kurangnya materi dalam kegiatan kepramukaan. Sedangkan yang menjadi dukungan adalah sarana dan prasarana yang memadai, lingkungan yang kondusif, serta dukungan dari pihak sekolah dan minat serta motivasi dari siswa.
CORAK TEOLOGI IBNU TAIMIYAH
Authors: - Syafrial. N 
Published: July 2019

Dalam sejarah umat Islam telah muncul di kalangan u1ama mazhab Hanbali yang dikenal dengan Gerakan Salafiyah. Aliran ini tampil lagi pada abad ke-7 H yang digagas oleh Syekh al-Islam Ibn Taimiyah. Ibn Taimiyah dalam pemikiran teologis mempunyai tujuan untuk mengajak umat Islam agar kembali kedasar agama dalam bentuk yang murni yakni al-Qur an dan Sunnah. Dari hal ini, penting untuk melihat tawaran Ibn Taimiyah secara komprehensif melalui corak teologinya. Setelah itu, dilanjutkan dengan melihat perbandingan dengan teologi yang sudah mapan sebelumnya.
Diseño de certificación lingüística comunicativa: ¿cómo evaluar la expresión e interacción escritas y orales?
Authors: Baralo Marta 
Published: July 2019

La posibilidad de medir y de evaluar las actividades de expresión y de interacción en una lengua, sea por el canal oral o el escrito, es un desafío para los especialistas en lingüística aplicada pues se trata de una apreciación subjetiva, que depende en gran parte del evaluador, de sus creencias y actitudes. Para conseguir que la prueba de evaluación sea válida, fiable y auténtica es necesario que su diseño esté sujeto a un conjunto de parámetros de calidad establecidos por las agencias e instituciones especializadas y que su aplicación cuente con un conjunto de herramientas de evaluación suficientemente probadas y un conjunto de evaluadores preparados que aseguren el acuerdo en la valoración del desempeño lingüístico comunicativo de los candidatos. Se presenta aquí la experiencia investigadora en el marco del diseño e implantación del Diploma LETRA (Lengua Española para Trabajadores inmigrantes) en la Comunidad de Madrid.
Los diccionarios en el mundo ELE: ayer, hoy y mañana (una reflexión desde la propia experiencia)
Authors: Maldonado González Concepción 
Published: July 2019

Dos preguntas clave deben responderse para poder abordar con éxito un proyecto lexicográfico didáctico pensado para la enseñanza del español como segunda lengua: ¿Deben los estudiantes de ELE consultar un diccionario monolingüe o uno bilingüe? ¿Por qué, si para el usuario el diccionario es siempre un instrumento al que se le exige una utilidad práctica inmediata, los lexicógrafos y profesores de ELE nos empeñamos en convertirlo en un medio con el que hacer ejercicios con objetivos de aprendizaje a largo plazo? De la respuesta que demos a ambas preguntas, y de la adecuación del trabajo lexicográfico a los tiempos actuales (es decir, a los tiempos de las obras de consulta en digital), dependerán el éxito o el fracaso de un diccionario ELE.
OKUL YÖNETİCİLERİNİN ÖĞRETMEN GÖRÜŞLERİNE GÖRE LİDERLİK DAVRANIŞLARININ FİLMLERDE ELE ALINAN LİDERLİK DAVRANIŞLARI İLE KARŞILAŞTIRMALI ANALİZİ
Authors: Köybaşı Fatma , Ugurlu Celal Teyyar 
Published: July 2019

Bu araştırmanın amacı, öğretmenlerin okul
yöneticilerinde gözlemledikleri ve istedikleri liderlik davranışları ile eğitim
liderliğini konu alan filmlerde ele alınan liderlik davranışlarını analiz
etmektir. Araştırma nitel yöntemlerle yürütülen durum çalışması modelindedir.
Amaçlı örnekleme yöntemlerinden olan ölçüt örnekleme ve maksimum çeşitlilik
örneklemesi ile çalışma grubu belirlenmiştir. Bu bağlamda çalışmanın
katılımcıları Sivas ilinde görev yapan, on yılını doldurma ölçütü baz alınarak
farklı branşlarda ve okul türlerinde çalışan 20 öğretmenden oluşmaktadır.
Veriler, ilk aşamada yarı yapılandırılmış görüşme formu ile elde edilmiştir.
Diğer veri toplama aracı olarak araştırmanın kapsamına uygun olduğu düşünülen
iki film üzerinden filmin konusu, ana teması, olay örgüsü ve karakterin
liderlik davranışlarını gösteren sahne kesitleri (farklılıkları bütünleştiren
durumlar, çatışma ve çözülme sahneleri) toplanmıştır. Öğretmen görüşleri ile
elde edilen veriler içerik analizi ile çözümlenmiştir. Filmlerden elde edilen
veriler ise betimsel analizle tema birimi ile çözümlenmiştir. Öğretmenlerin okulda okul yöneticilerini
gözlemlediği liderlik davranışları ile filmlerde yer alan eğitimsel liderlik
davranışlarının ortak noktada birleştiği alanlara ilişkin ortaya çıkan ana tema
çok yönlü ve değer odaklı ilişkilerdir. Bu bağlamda okul yöneticilerinin
liderliğini konu alan filmlerin tanıtımı ve izlenmesi yönünde seminerlerin
düzenlenmesi önerilebilir.
Study of prevalence of hypertension and its various risk factor in type 2 diabetes mellitus patients
Authors: Uma Narendra M. , Parmar Mahendra C. , Shah Siddarth , Dindod Sonal M. 
Published: July 2019

Background: Surgical diabetes is syndrome of hyperglycemia and disturbance of carbohydrate, fat and protein metabolism associated with absolute or relative deficiency of insulin secretions. Diabetes mellitus and hypertension considered as a major medical and public health issues worldwide, and both are important risk factors for both macrovascular and microvascular diseases like coronary artery disease, heart failure and cerebrovascular diseases.Methods: This cross-sectional study was conducted among 175 patients coming to Govt. medical college and SSG hospital, Vadodara from 2014 to 2015 having diabetes mellitus were studied and evaluated for hypertension and its various risk factor like age, obesity.Results: one hundred and twenty-nine (127) out of 175 subjects had hypertension, thus giving a prevalence rate of 73.7% of which 64 males (49.6%) were hypertensive compared with 65 (50.3%) females. Mean age of patients having hypertension with Diabetes Mellitus (case) is 59.87 compare to DM without hypertension (control) was 56.21. Mean BMI in diabetes cases with hypertension was 30.93 while without hypertension was 23.47 suggest obese are more prone to develop hypertension. Waist hip ratio DM with hypertension was 0.96 while was 0.81 in DM without hypertension.Conclusion: Hypertension and its associated risk factor like obesity, dyslipidemia are important risk factor for development of complication in diabetes patients so early detection and intervention measures should be undertaken for aggressive control of blood pressure control , obesity and it will likely to offer the greatest promise for reducing the incidence of complications and its associated mortality.
Influência de tensoativo na liberação de própolis de cimentos ionoméricos modificados em diferentes períodos de tempo.
Authors: Medeiros Samara Tonholo , Souza Stéfane Edne , Barros Vinícius De Magalhães , Vaz Ricardo Rodrigues , Santos Vagner Rodrigues , Vasconcellos Walison Arthuso 
Published: July 2019

Objetivo: O objetivo deste estudo foi avaliar in vitro a influência de um tensoativo na liberação de própolis de um cimento ionomérico modificado, em diferentes períodos de tempo. Métodos: Vinte corpos-de-prova foram confeccionados e divididos em dois grupos, sendo que no grupo A foi utilizado o pó modificado e o líquido do ionômero e no grupo B além do pó modificado e o líquido foi adicionado um tensoativo (álcool 50%). A liberação foi mensurada nos tempos de 1h, 2h,4h, 24h, 7 dias, 15 dias e 30 dias através de um espectrofotômetro. As mensurações foram realizadas no comprimento de 300nm, e os resultados submetidos à análise de variância (p=0,05). Resultados: Os resultados apontaram que a liberação foi significativamente maior nos tempos de 24 horas (média de 166,6µg para o grupo A e 118,9µg para grupo B) e 7 dias (Grupo A:134,4µg; Grupo B:168µg), quando comparado aos demais períodos estudados. Conclusão: A própolis incorporada ao cimento ionomérico modificado foi liberada, sendo sua liberação influenciada pelo período de liberação, e não havendo diferença significante em função do uso ou não de tensoativo.
Oil Recovery by Alkaline/Surfactant/Foam Flooding: Effect of Drive-Foam Quality on Oil-Bank Propagation
Authors: Janssen Martijn T. , Zitha Pacelli L. , Pilus Rashidah M. 
Published: July 2019

Summary
Alkaline/surfactant/foam (ASF) flooding is a novel enhanced–oil–recovery (EOR) process that increases oil recovery over waterflooding by combining foaming with a decrease in the oil/water interfacial tension (IFT) by two to three orders of magnitude. We conducted an experimental study regarding the formation of an oil bank and its displacement by foam drives with foam qualities within the range of 57 to 97%. The experiments included bulk phase behavior tests using n–hexadecane and a single internal olefin sulfonate surfactant, and a series of computed–tomography (CT) –scanned coreflood experiments using Bentheimer Sandstone cores. The main goal of this study was to investigate the effect of drive–foam quality on oil–bank displacement. The surfactant formulation was found to lower the oil/water IFT by at least two orders of magnitude. Coreflood results, at under-optimum salinity conditions yielding an oil/water IFT on the order of 10–1 mN/m, showed similar ultimate–oil–recovery factors for the range of drive–foam qualities studied. A more distinct frontal oil–bank displacement was observed at lower drive–foam qualities investigated, yielding an increased oil–production rate. The findings in this study suggested that dispersive characteristics at the leading edge of the generated oil bank in this work were strongly related to the surfactant slug size used, the lowest drive–foam quality assessed yielded the highest apparent foam viscosity (and, thus, the most stable oil–bank displacement), and drive–foam strength increased upon touching the oil bank when using drive–foam qualities of 57 and 77%.
Microemulsion Effects on Oil Recovery From Kerogen Using Molecular-Dynamics Simulation
Authors: Bui Khoa , Yucel Akkutlu I.. , Zelenev Andrei S. , Hill W. A. , Griman Christian , Boudreaux Trudy C. , Silas James A. 
Published: July 2019

Summary
Source rocks contain significant volumes of hydrocarbon fluids trapped in kerogen, but effective recovery is challenged because of amplified fluid/wall interactions and the nanopore–confinement effect on the hydrocarbon–fluid composition. Enhanced oil production can be achieved by modifying the existing molecular forces in a kerogen pore network using custom–designed targeted–chemistry technologies. The objective of this paper is to show that the maturation of kerogen during catagenesis relates to the qualities of the kerogen pore network, such as pore size, shape, and connectivity, and plays an important role in the recovery of hydrocarbons. Furthermore, using molecular–dynamics (MD) simulations, we investigated how the transport of hydrocarbons in kerogen and hydrocarbon recovery can be altered with the delivery of microemulsion and surfactant micelles into the pore network.
New 3D kerogen models are presented using atomistic modeling and molecular simulations. These models possess important chemical and physical characteristics of the organic matter of the source rock. A replica of Type II kerogen representative of the source rocks in the Permian Basin in the US is used for the subsequent recovery simulations. Oil–saturated kerogen is modeled as consisting of nine different types of molecules: dimethyl naphthalene, toluene, tetradecane, decane, octane, butane, propane, ethane, and methane. The delivered microemulsion is an aqueous dispersion of solvent–swollen surfactant micelles. The solvent and nonionic surfactant present in the microemulsion are modeled as d–limonene and dodecanol heptaethyl ether (C12E7), respectively. MD simulation experiments include two stages: injection of an aqueous–phase microemulsion treatment fluid into the oil–saturated kerogen pore network, and transient flowback of the fluids in the pore network. The used 3D kerogen models were developed using a representative oil–sample composition (hydrogen, carbon, oxygen, sulfur, and nitrogen) from the region. Simulation results show that microemulsions affect the reservoir by means of two different mechanisms. First, during the injection, microemulsion droplets possess elastic properties that allow them to squeeze through inorganic pores smaller than the droplet's own diameter and to adsorb at the kerogen surfaces. The solvent dissolves in the oil phase and alters the physical and transport properties of the phase. Second, the surfactant molecules modify the wettability of the solid kerogen surfaces. Consequently, the recovery effectiveness of heavier oil fractions is improved compared with the recovery effectiveness achieved with surfactant micelles without the solubilized solvent.
The results indicate that solubilized solvent and surfactant can be effectively delivered into organic–rich nanoporous formations as part of a microemulsion droplet and aid in the mobilization of the kerogen oil.
Quantification of the Viscoelastic Effects During Polymer Flooding: A Critical Review
Authors: Azad M. S. , Trivedi J. J. 
Published: July 2019

SummarySince the late 1960s, several enhanced–oil–recovery (EOR) researchers have developed various continuum and pore–scale viscoelastic models for quantifying the altered injectivity and incremental oil recovery because of the polymer's viscoelastic effects. In this paper, limitations in each of the continuum and pore–scale models are discussed. The critiques are made on the basis of the contradicting literature.Most of the earlier models rely on the exclusive use of the Deborah number to quantify the viscoelastic effects. The Deborah number overlooks mechanical–degradation effects. There exists a large difference in the magnitudes of the reported Deborah number in the literature because of the inconsistency in using different relaxation time and residential time. Oscillatory relaxation time used by most of the EOR researchers to calculate the Deborah number failed to distinguish the different porous–media behavior of the viscous and viscoelastic polymer. Therefore, the accuracy of relaxation time obtained from the weak oscillatory field for EOR applications in porous media is questionable. The main limitation with all the existing continuum viscoelastic models is the empirical reliance on coreflood data to predict the shear–thickening effects in porous media. The strain hardening index, needed for quantifying the thickening regime, cannot be obtained by the conventional shear rheological techniques. The conventional capillary number (Nc) failed to explain the reduction in residual oil saturation (Sor) during viscoelastic polymer flooding. Pore–scale viscoelastic models use the conventional oscillatory Deborah number for quantifying the polymer's viscoelastic effects on Sor reduction. However, this approach has many drawbacks.Discussions on the shortcomings of the existing viscoelastic models caution the current chemical EOR (cEOR) researchers about their applications and potential consequences. Also, this research provides a path forward for future research to address the limitations associated with the quantification of viscoelastic flow through porous media.
Association Between Configuration of Basilar Artery and Vessel Wall Features: A Prospective High-resolution MR imagine Study
Authors: Xu Ziqi , Li Mingyao , Hou Zhikai , Lyu Jinhao , Zhang Na , Lou Xin , Miao Zhongrong , Ma Ning 
Published: July 2019

Abstract
Background

We aimed to investigate the relationship between distal and proximal anatomical configurations of basilar artery (BA) and vessel wall features on high resolution magnetic resonance imaging (HRMRI).

Methods

From September 2014 to January 2017, patients with suspected symptomatic intracranial arterial stenosis underwent HRMRI. Patients with severe BA stenosis were enrolled. Configurations of BA were divided complete and incomplete groups based on with or without bilateral vertebral arties and posterior cerebral arteries. Culprit vessel wall features on HRMRI included enhancement grade, intraplaque hemorrhage, remodeling patterns, and plaque distribution. Culprit vessel wall features were compared between complete and incomplete groups.

Results

Among the 298 consecutively enrolled patients, 34 consecutive patients had severe BA stenosis. Seventeen patients had complete configuration and 14 patients with incomplete configuration. There were no statistics difference in vessel wall features between complete and incomplete groups configuration groups. The proximal configuration of BA was associated with intraplaque hemorrhage(p=0.002) and the distal configuration of BA correlated with strong enhancement of BA plaque(p=0.041).

Conclusions

The complete and incomplete groups configuration of BA did not associate with vessel wall features. The proximal configuration of BA was related with intraplaque hemorrhage and the distal configuration of BA was associated with strong plaque enhancement. These findings are continuously needed to confirmed in future studies.