bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pengaruh Metode Praktikum IPA Berbasis Science Writing Heuristic (SWH) dan Motivasi Berprestasi Terhadap Hasil Belajar Kognitif Peserta Didik
Authors: Retnosari Tri , Nurbaity Nurbaity , Paristiowati Maria 
Published: February 2019

Penelitian ini bertujuan untuk menganalisis pengaruh metode praktikum IPA berbasis SWH dan motivasi berprestasi peserta didik terhadap hasil belajar IPA di kelas 7 pada materi Sifat dan Perubahan Fisika dan Kimia. Penerapan metode praktikum IPA berbasis Science Writing Heuristic (SWH) dan motivasi berprestasi merupakan pendekatan yang berperan dalam mendukung proses pembelajaran. Penelitian dilakukan pada bulan Oktober 2015-Juni tahun 2016 di salah satu SMP swasta yang ada di Bekasi. Metode penelitian yang digunakan adalah kuasi eksperimen dengan disain faktorial 2x2. Sampel terdiri atas 40 peserta didik yang diambil dengan diteknik simple random sampling. Data hasil belajar kognitif diukur menggunakan tes hasil belajar dan motivasi belajar ditentukan berdasarkan hasil kuesioner. Data yang diperoleh berdistribusi normal dan homogen. Hasil analisis data menggunakan uji ANAVA 2 arah diperoleh hasil: 1) Penerapan metode praktikum SWH memberikan hasil belajar IPA yang lebih tinggi dibanding metode konvensional, 2) Penerapan metode praktikum SWH pada peserta didik dengan motivasi berprestasi tinggi memberikan hasil belajar IPA yang lebih tinggi dibanding metode konvensional; 3) Penerapan metode praktikum SWH pada peserta didik dengan motivasi berprestasi rendah tidak menghasilkan belajar IPA yang lebih tinggi dibanding metode konvensional; 4) Terdapat interaksi metode praktikum dan motivasi berprestasi terhadap hasil belajar IPA.
Kata Kunci: Science Writing Heuristic, Motivasi Berprestasi, Hasil Belajar
Pengembangan Media Pembelajaran Mobile Learning Berbasis Android pada Materi Sifat Koligatif Larutan
Authors: Nurhalimah Septina Restu , Suhartono Suhartono , Cahyana Ucu 
Published: February 2019

Penelitian ini bertujuan untuk mengembangkan media pembelajaran mobile learning untuk smartphone pada materi sifat koligatif larutan. Penelitian ini menggunakan pendekatan penelitian dan pengembangan model Borg & Gall yang telah diadaptasi. Tahapan penelitian terdiri atas analisis kebutuhan, pengembangan media, dan uji coba media. Hasil analisis kebutuhan menunjukan bahwa 91,7% siswa merasa perlu adanya pengembangan media pembelajaran mobile learning pada materi sifat koligatif larutan. Media yang dikembangkan ini berupa aplikasi khusus unuk android dengan ukuran 49,49MB. Hasil uji coba oleh ahli media diperoleh persentase kelayakan sebesar 87,2%. Hasil uji coba oleh ahli materi diperoleh persentase kelayakan sebesar 88%. Hasil uji coba kepada guru kimia diperoleh sebesar 94%. Hasil uji coba kepada siswa skala kecil diperoleh sebesar 79%. Hasil uji coba kepada siswa skala besar diperoleh sebesar 80%. Dari keseluruhan uji tersebut dapat disimpulkan bahwa Media Pembelajaran Mobile Learning Berbasis Android Pada Materi Sifat Koligatif Larutan telah sesuai dengan kebutuhan siswa dan guru dengan hasil interpretasi baik.
Kata Kunci: Media Pembelajaran Kimia, Mobile Learning, Android, Sifat Koligatif Larutan
Pengaruh Model Pembelajaran Problem Based Learning (PBL) Terhadap Kemampuan Berpikir Kritis Siswa pada Materi Sistem Koloid
Authors: Pusparini Septiwi Tri , Feronika Tonih , Bahriah Evi Sapinatul 
Published: February 2019

Menurut beberapa penelitian terdahulu, kemampuan berpikir kritis siswa kurang terlatih dikarenakan pembelajaran lebih berpusat kepada guru (teacher center). Penelitian ini bertujuan untuk mengetahui pengaruh penerapan model pembelajaran Problem Based Learning (PBL) terhadap kemampuan berpikir kritis siswa pada materi sistem koloid. Penelitian ini dilaksanakan di SMAN 10 Kota Tangerang Selatan pada bulan Februari semester genap tahun ajaran 2016/2017. Metode penelitian yang digunakan dalam penelitian ini adalah quasi eksperimen. Sampel penelitian berjumlah masing-masing 30 orang siswa pada kelas kontrol maupun eksperimen. Teknik pengumpulan data yang digunakan yaitu purpossive sampling. Instrumen utama yang digunakan yaitu tes essay sebanyak 10 butir soal. Hasil uji hipotesis menggunakan bantuan software SPSS versi 22 diperoleh data bahwa sig < Î± yaitu 0,000 < 0,05 pada taraf signifikansi 5% sehingga H0 ditolak dan terima H1. Hal ini menunjukkan bahwa terdapat pengaruh model pembelajaran Problem Based Learning (PBL) terhadap kemampuan berpikir kritis siswa.

Kata kunci
Model Pembelajaran Problem Based Learning (PBL), Kemampuan Berpikir Kritis, Sistem Koloid.
Desenvolvimento da competência comunicativa oral em PLE: teletandem em foco
Authors: Lopes Messias Rozana Aparecida , Ferreira Michael J. 
Published: February 2019

Tendo por base a modalidade Teletandem Institucional Integrado – na qual as interações ocorrem planejadas no currículo de uma disciplina (ARANHA; CAVALARI, 2014) – e buscando responder às questões: (a) em que medida a prática de teletandem institucional integrado influencia o desenvolvimento da competência comunicativa oral e (b) que aspectos da fala do interagente de teletandem evidenciam o desenvolvimento de sua produção oral, por um semestre letivo, assistimos e assessoramos as aulas de Língua Estrangeira-PLE, analisamos documentos e acompanhamos o desenvolvimento das atividades de Teletandem de uma turma de uma universidade norte-americana. O estudo foi desenvolvido com base na metodologia qualitativa (ANDRÉ, 1984; FLICK, 2004); teorias que sustentam a ideia de competência comunicativa oral (CANALE; SWAIN, 1980) e, como parâmetro de proficiência, os descritores do Quadro Europeu Comum de Referência para Línguas (CONSELHO DA EUROPA, 2001). A partir da triangulação dos dados, em análise preliminar, elaboramos um quadro que demonstra a construção da proficiência oral de dois estudantes praticantes de teletandem, bem como expõe diferentes variáveis que podem impactar o desenvolvimento e a avaliação da proficiência em foco.
API Connection Leak Equation Extended with Dependence on Axial Force and Backup Pressure
Authors: Goodman Malcolm , Mitchell Robert , Kalil Issa 
Published: February 2019

Abstract
The existing API equation for internal leak predicts the internal pressure to overcome the pin-box contact pressure generated from the makeup interference plus the energizing effect of internal pressure which enhances the seal. For threaded connections, internal and external pressures close the connection and increase the leak resistance, whereas axial loads open the connection and decrease the leak resistance. These competing effects must be included to accurately assess the connection leak resistance under any combination of loads at any point in any string. Following the same approach used by API for internal leak, this paper obtains similar results for external leak. For API connections, the effects of combined axial force and backup pressure are then incorporated into the internal/external leak equations using results from the Mitchell and Goodman (2018) paper presented at the 2018 SPE-IADC Drilling Conference. Sensitivities of leak ratings to combined loads for API connections are presented for both tubing and casing sizes. An example design case shows the importance of considering combined loads.
Automated Drilling Narratives: A Scalable Workflow to Measure the Effectiveness of Drilling Procedures
Authors: Hamzah Mohammad , Erge Oney , Chambon Sylvain 
Published: February 2019

Abstract
Driller's instructions are written with the expectation that the specific procedures they contain will be followed by the driller during execution. Compliance with these instructions, such as connection practices, is rarely monitored as this would require either the company man to be next to the driller, or an interpretation engineer to examine multiple measurement curves remotely. This paper will present an automated system capable of generating narratives of the driller's action from real-time drilling data. These drilling narratives are intended to provide a consistent interpretation of the driller's actions in context, with a goal of improving the effectiveness of the procedures.
To avoid the need for intensive interpretation of multiple measurement curves, several algorithms are used to segment the drilling data into partitions that encompass the sequences of operations during drilling or tripping. In each of these partitions, surface measurements are used to infer the driller's actions. Different combinations of the actuation of the block, mud pumps, top drive rotation, and their corresponding responses, are assigned pre-defined labels such as taking a survey, working the pipe, or conducting a friction test. These labels are later combined sequentially to form the drilling narrative.
Automating the generation of the narratives allows the drilling engineer to quickly search, extract and load events of interest, making it easier to measure the effectiveness of the planned drilling procedures outlined in the drilling program. In addition, it will also allow driller's action to be translated from a set of real-time data curves to a structured narrative that could be understood and read as a quick summary of drilling events in real time.
This automated, scalable method should be beneficial to drilling engineers, who currently spend many hours on analyzing drilling operations data, allowing them to come up with better plans and procedures for the next well.
Combined Gyroscopic and Magnetic Surveys Provide Improved Magnetic Survey Data and Enhanced Survey Quality Control
Authors: Weston John , Ledroz Adrián 
Published: February 2019

Abstract
The use of advanced solid-state gyroscopic sensors has now become both a viable and practical option for high accuracy wellbore placement, with the potential to out-perform traditional mechanical gyroscopic systems. This paper describes how the contributions of the new gyroscope technology are causing service providers to reconsider current survey practices, and to examine how the new gyroscopic survey tools can be best used for wellbore surveying and real-time wellbore placement.
The simultaneous application of multiple survey tools, largely made possible as a result of the unique attributes of solid-state gyroscopic sensors (including small size and significant power reduction), has clear benefits in terms of enhanced well placement, reliability and the detection of gross errors in the survey process. Further benefits accrue through the combination of different, but complimentary survey methods. This paper focuses mainly on the benefits of combining gyroscopic and magnetic measurements to reduce or remove the known errors related to the Earth's magnetic field to which magnetic survey systems are susceptible; errors in total magnetic field, declination and dip angle.
In this context, the use of statistical estimation techniques based on performance models of the survey systems used is described. For post-drilling surveys (using drop survey tools or wireline-conveyed tools for example), post-run analysis of the data using least-squares estimation techniques is appropriate. Alternative methods capable of achieving real-time data correction during drilling are also described and results are presented to demonstrate the potential for enhanced magnetic survey performance.
The principles described may be used when running basic magnetic measurement while drilling (MWD) systems, and for systems that employ field correction methods, such as the various in-field referencing (IFR) techniques, that are frequently used. The proposed methodology is of particular benefit in the former case, allowing enhanced magnetic surveying to be achieved without the need for expensive and complex magnetic field correction procedures. The potential also exists either to identify or to correct possible errors in the IFR data when such methods are used. This information may be of great value for the safe drilling of additional wells in the same region.
Exceptional Flat Rheology Using a Synthetic Organic-Inorganic Hybrid in Oil-Based Muds Under High Pressure and High Temperature
Authors: Patel Hasmukh A. , Santra Ashok , Thaemlitz Carl J. 
Published: February 2019

Abstract
We developed a novel organic-inorganic hybrid that composed of various organic moieties covalently linked with nanometer thick inorganic platelets. The synthesized compounds are highly pure and have reproducible chemical compositions. These hybrids are employed as viscosifier in oil-based drilling fluids. The rheological behavior was studied at ambient condition as well as under high pressure and high temperature. A facile, one-pot synthetic route generate nanometer sized layered materials with covalently bound organic functionalities, as confirmed by X-ray powder diffraction and Infrared spectroscopy. An unprecedented improvement in flat rheology was observed under high pressure (10000 psi) and temperature up to 300°F as compared to commercial organoclays. The temperature dependent viscosity and viscoelastic properties of the fluids are also demonstrated. It has been challenging to obtain flat rheological behavior under high pressure and temperature by using commercial organoclays. A flat rheological behavior is achieved by incorporating organic-inorganic hybrids in drilling fluids.
Well Control and Temperature Modelling Facilitates the Effective Delivery of Challenging Shallow Water HPHT Exploration Well
Authors: Davis Mark , Selent Ivo , Duplessis Bertrand , Janisch Werner 
Published: February 2019

Abstract
Drilling operations in high-pressure/high-temperature (HP/HT) environments can be very challenging and costly. In an exploration well being drilled in a unique depositional environment, a rapid increase in pore pressure was anticipated, potentially reaching HP/HT conditions of up to 12,000 psi and over 180°C. The absence of close offset wells resulted in a large uncertainty in the magnitude of the pore pressure. This drove the planned casing design, which was limited by kick tolerance and potentially narrow margins between pore pressure and fracture gradient, resulting in planning for up to six casing strings.
To respond to this challenge, standard engineering practices were augmented with additional monitoring and predictive modelling solutions to improve well control and to predict and explain complex well behaviour and mitigate the associated drilling risks. The models were calibrated with measured mud properties and wellbore temperatures and pressures during operations. They were then used to simulate, explain, and predict variations in downhole pressures and surface mud volumes. Various innovative applications were used to guide safe operational decision-making. Where conventional practices would not have allowed, this modelling enabled total depth of the well to be reached while incurring minimal nonproductive time and no well control incidents.
By understanding wellbore conditions using advanced well control and temperature simulators, abnormalities normally failing the conventional practices could be detected and explained. This improved well control, safety, rig performance, and effective application of resources.
The Effect of Pipe Rotation on Dynamic Well Control Casing Pressure Using the Dispersed Bubble Model
Authors: Marhoon Zahrah Al , Ramis Hussain Al 
Published: February 2019

Abstract
Managed Pressure Drilling is a new technology that has recently emerged in the industry. It has special well control capabilities supported by the rotating control device to simultaneously provide the required pressure control on a certain volume gas influx and maintain the pipe rotation for drilling or any other operation. This paper examines the effect of pipe rotation on casing pressure profiles while circulating out the kick using MPD equipment.
The PERTT lab personnel conducted experiments during the 80s in a real scale well under controlled environment that mimicked downhole conditions with a gas influx entering the wellbore. The data experimental analysis was coupled with the effect of pipe rotation through the application of correlations. The correlations from literature show a change in the expected frictional pressure loss when comparing the rotating case to the non-rotating case. This change is then applied on the geometric configuration of the well to find the changein the surface casing pressure caused by rotation.This paper covers the developed dispersed bubble model in WBM. This model includes the effect of the bubble dispersing into smaller bubble size on surface casing pressure. The validity of the single bubble model was examined inthis paper. The results showed that the changes in surface pressure are considerable when the gas bubble is able to break down with a decrease of up to 30 %. These changes are only applicable to cases with similar mud properties and well design of the experiments. The practical outcome is to further the understanding of a gas bubble behavior in a wellbore experiencing an influx. Since new technologies allow for the rotation of the pipe during the kick circulation process, this paper helps in answering the question of whether or not the pipe rotation aids in overall expected surface pressure. Furthering the window of applicability of the MPD can possibly touch into its unexploited potential.
Safety and efficacy of Curcumin versus Diclofenac in Knee Osteoarthritis: a randomized open label parallel arm study
Authors: Shep Dhaneshwar , Khanwelkar Chitra , Gade Prakashchandra , Karad Satyanand 
Published: February 2019

Abstract
Background: To compare the efficacy and safety of curcumin with diclofenac in the treatment of knee osteoarthritis (OA).
Methods: In this randomized, open label, parallel, active controlled clinical study, 139 patients of knee OA were randomized to receive either Curcumin 500 mg (Curcugreen®) capsule thrice daily or diclofenac 50 mg tablet twice daily for 28 days. Patients underwent assessment at baseline, day 7, day 14 and day 28. Primary efficacy measures were severity of pain (Visual Analogue Scale) and the Knee injury and osteoarthritis outcome score (KOOS) subscale at day 14 and day 28. Anti-flatulent effect (at day 7), anti-ulcer effect, weight lowering effect, patient and physician’s global assessment of therapy at day 28 were included as secondary endpoints. Safety after treatment was evaluated by recording adverse events and laboratory investigation.
Results: Both treatment groups showed similar improvement in primary endpoints at day 14 and day 28. Patients receiving curcumin showed similar improvement in severity of pain and KOOS scale when compared to diclofenac, and the difference was not statistically significant (p>0.05). On day 7, the patients treated with curcumin experienced significantly greater reduction in number of episodes of flatulence compared with diclofenac (p<0.0001). Similar trend was observed at day 28 for weight lowering effect of curcumin (p<0.0001) and anti-ulcer effect. None of the patients required H2 Blockers in curcumin group and 19 patients required H2 blockers in diclofenac group (0% Vs 28%, respectively; p<0.00001). Adverse effects were significantly less in curcumin group (13% vs. 38% in diclofenac group; p=0.0015). Patient’s and physician’s global assessment of therapy was similar towards both the treatment.
Conclusion: Curcumin has similar efficacy, but better tolerated than diclofenac among patients with knee OA. Curcumin can be an alternative treatment option in the patients of knee OA who are intolerant to the side effects of NSAIDS.
Trial Registration: ISRCTN, ISRCTN10074826, Registered 21 November 2017 - Retrospectively registered, http://www.isrctn.com/ISRCTN10074826
Keywords: Knee osteoarthritis; Pain; Curcumin; Diclofenac; Anti-flatulent; Weight lowering; Anti-ulcer
3D- vs. 4K-Display System - Influence of "State-of-the-art"-Display Technique On Surgical Performance (IDOSP-Study) in minimal invasive surgery: protocol for a randomized cross-over trial
Authors: Wahba Roger , Datta Rabi R , Hedergott Andrea , Bußhoff Jana , Bruns Thomas , Kleinert Robert , Dieplinger Georg , Fuchs Hans , Giezelt Caroline , Möller Desdemona , Hellmich Martin , Bruns Christiane J , Stippel Dirk L 
Published: February 2019

Abstract
Abstract

Background
Three-dimensional (3D) stereoscopic vision is crucial to perform any kind of manual tasks. The reduction from real life 3D- to virtual two-dimensional (2D) sight is a major challenge in minimal invasive surgery (MIS). 3D-display technique has shown to reduce operation time, mistakes, and to improve the learning curve. Therefore it seems to optimize surgical performance for novice and experienced surgeons. Inspired by consumer electronics 4K-display technique was recently introduced to MIS. Due to its high resolution and zoom-effect surgeons should benefit from it. Aim of this study is to evaluate if “state-of-the-art” 3D- versus 4K- display techniques could influence surgical performance.

Methods
A randomized cross-over single-institution single-blinded trial is designed. It compares the primary outcome parameter “surgical performance”, represented by “performance time “ and “number of mistakes”, using a passive polarizing 3D- and a 4K-display system (2 arms) to perform different tasks in a minimal invasive/laparoscopic training parkour. Secondary outcome parameters are the mental stress load (NASA task load index) and the learning curve. Unexperienced novices (medical students), non-board certified and board-certified abdominal surgeons participate in the trial (i.e. level of experience, 3 strata). The parkour consists of 7 tasks (novices 5 tasks), which will be repeated 3 times. The 1st run of the parkour will be performed with the randomized display system, the 2nd run with the other one. After each run, the mental stress load is measured. After completion of the parkour, all participants are evaluated by an ophthalmologist for visual acuity and stereoscopic vision with five tests. A sample-size of 36 per stratum is required to detect a standardized effect of 1.0 (including additional 5% for a non-parametric approach) with a power of 80% at two-sided type I error of 5%. Thus, altogether 108 subjects need to be enrolled.

Discussion
Complex surgical procedures are performed in minimal invasive/laparoscopic technique. This study should provide some evidence to decide which display technique a surgeon could choose to optimize his performance.

Trial Registration
This trial is registered at clinicaltrials.gov (trial number: NCT 03445429, registered February 7, 2018, http://www.clinicaltrials.gov)