bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pembelajaran Berbasis Masalah Dalam Meningkatkan Kemampuan Mencari Solusi Altenatif Pada Penyelesaian SoalMatematika Sekolah Dasar
Authors: Rostika Deti , Windayana Husen , Komariah - 
Published: August 2016

<p>Latar belakang dari penelitian ini berdasarkan hasil observasi ke SD di lingkungan Cileunyi Bandung, pada umumnya pembentukan keterampilan mencari solusi alternatif dari sebuah penyelesaian soal dalam pembelajaran matematika kurang diberikan pada siswa. Umumnya penyelesaian soal matematika, siswa digiring pada satu penyelesaian yang ada. Biasanya siswa diarahkan untuk menyelesaikan soal matematika dengan menggunakan cara yang biasa, yang diketahui guru dan cara tersebut merupakan satu-satunya cara yang harus dikuasai oleh siswa. Adapun rumusan masalah dalam penelitian ini adalah “Bagaimana kemampuan siswa dalam mencari solusi alternatif terhadap soal-soal matematika yang diberikan sebelum dan setelah belajar dengan menggunakan pembelajaran berbasis masalah?” dan Apakah pembelajaran berbasis masalah berpengaruh signifikan terhadap kemampuan siswa dalam mencari solusi alternatif ketika menyelesaikan soal-soal matematika? Tujuan penelitian adalah untuk meningkatkan kemampuan mencari solusi alternatif dari sebuah penyelesaian soal matematika melalui pembelajaran berbasis masalah. Metode penelitian adalah penelitian kuantitatif jenis eksperimen dengan desain penelitian pre-test pos-test tanpa kelas kontrol. Instrumen yang digunakan adalah tes untuk melihat kemampuan siswa dalam mencari solusi alternatif terhadap soal-soal matematika, dan lembar observasi untuk melihat pembelajaran matematika berbasis masalah. Populasinya adalah seluruh siswa kelas III Sekolah Dasar yang terdapat di lingkungan Kecamatan Cileunyi Kabupaten Bandung. Sampel penelitiannya dipilih secara acak berdasarkan sekolah, bukan berdasarkan siswa. Untuk kebutuhan pengujian hipotesis penelitian dilakukan uji statistik menggunakan uji t ketika memenuhi persyaratan uji t, yaitu normal dan homogen. Ketika tidak dipenuhi persyaratan untuk uji t, maka dilakukan uji nonparametrik menggunakan uji Mann Whitney. Hasil penelitian menunjukkan bahwa Kemampuan siswa dalam mencari solusi alternatif, terhadap soal-soal matematika yang diberikan, sebelum belajar menggunakan pembelajaran matematika berbasis masalah tergolong rendah. Kemampuan siswa dalam mencari solusi alternatif, terhadap soal-soal matematika yang diberikan, setelah belajar menggunakan pembelajaran berbasis masalah mengalami peningkatan yang signifikan, yaitu dari rendah menjadi sangat tinggi. Pembelajaran berbasis masalah berpengaruh secara signifikan terhadap kemampuan siswa dalam mencari solusi alternatif terhadap penyelesaian soal-soal matematika. </p><p>Kata Kunci: Pembelajaran Berbasis Masalah, Kemampuan Mencari Solusi Alternatif</p>
Intra Arterial Heparin Flushing Increases Cereberal Blood Flow in Chronic Ischemic Stroke Patients
Authors: Putranto Terawan Agus , Yusuf Irawan , Murtala Bachtiar , Wijaya Andi 
Published: August 2016

BACKGROUND: Recently, stroke therapy is focused on reperfusion therapies for restoring cerebral blood flow (CBF) and minimizing the undesired effects of neuron ischemia. However, the thrombolytic therapy to restore CBF was restricted with narrow time window. On other hands, not many patients can reach the treatment immediately after the onset of stroke. A wider time window therapy that might increase CBF would probably helpful. This study aims to investigate the CBF improvement after intra arterial heparin flushing (IAHF) therapy in chronic stroke patients.METHODS: A clinical trial was conducted with time sampling. We collected chronic ischemic stroke subjects (with stroke onset ≥30 days) within periods February-September 2015. We investigated CBF before and after IAHF treatment in 75 chronic stroke patients. The difference before and after IAHF treatment in subgroup which is classified with infarct size and lesion area was tested. CBF was measured using MRI Quality Arterial Spin Labeling (qASL) with region of interest around infarct lesion.RESULTS: We found a significant CBF improvement (p<0.001) around infarct area after IAHF treatment with average 10.39mL/100g/min raised. CBF improvement was found in lacunar infarct (p<0.001) and non lacunar (p<0.001), also in infarct in cortical (p<0.05), subcortical (p<0.001) and both area (p<0.05).CONCLUSION: IAHF is associated with increased CBF around infarct area and IAHF probably offers some benefit for chronic stroke.KEYWORDS: IAHF, CBF, chronic stroke, ischemic, lacunar, non lacunar, cortical lesion, subcortical lesion
L - Fuzzy BP – Algebras
Authors: Jefferson Y. Christopher , Chandramouleeswaran M. 
Published: August 2016

<div><p><em>In this paper, we define the notion of L-Fuzzy BP-Algebras. We discuss the properties of L-Fuzzy BP-subalgebras and prove results on the notion of Intersection of L-fuzzy BP-subalgebras and Cartesian product of L- fuzzy BP-subalgebras.</em></p></div>
The Science of Quality Improvement
Authors: Girdler Steven J. , Glezos Christopher D. , Link Timothy M. , Sharan Alok 
Published: August 2016

➢ The manufacturing industry has supplied many quality-improvement methodologies that have been successfully utilized in health-care delivery, such as Plan-Do-Study-Act (PDSA) cycles, Total Quality Management, Six Sigma, and Lean.➢ Many tools of quality improvement, such as PDSA cycles and DMAIC (Design-Measure-Analyze-Improve-Control) of the Six Sigma method, are similar to the scientific method that is familiar to clinicians.➢ Correct identification of thesourcesandtypesof process variation within a system is paramount for process improvement.➢ Reduction in process variation via standardization and reinforcement of process protocols leads to improved process outcomes.➢ Quality-improvement projects should define a clear governance structure to maintain project timeliness and completion.
State-of-the-Art Open Hole Tractor Enables Accurate Pressure Measurement in Horizontal Wells, Resulting in Significant Rig Time Saving
Authors: Al-Khaldy M. D. , AlRashidi A. , Failakawi K. Al , Dutta A. , Ayyad H. , Mansour O. , AlMahdy M. , Jamal S. 
Published: August 2016

Abstract
In North Kuwait, formation evaluation in horizontal/highly deviated wells typically requires the use of Logging While Drilling (LWD) technology. In this paper, we will discuss how for the first time in Kuwait a state-of-the-art wireline open hole tractor has been successfully used to convey an advanced wireline pressure measurement in a horizontal well. Two wells will be discussed in this paper, the first was a short radius horizontal side track in the tight carbonate formation while the second is highly deviated well across sand/shale layers.
Traditionally in horizontal wells, the pressure measurement is either run on drill pipe or LWD. Moreover, the formation tightness posed another challenge, as stabilized formation pressures can be difficult to achieve. To address the challenge of formation tightness and save rig time, a fast wireline pretest measurement tool allowing dynamic control of the pretest system would be conveyed on wireline using Open Hole tractor. A job simulation was conducted, based on the friction force and tool weight, to ensure the ability of conveying the tractor to the required depth in addition to the ultimate tractor drives number with tandem1 configuration. After gaining confidence and experience from the first well tractoring across tight consolidated carbonate, it was decided to go for open hole tractoring across less consolidated sand/shale layers in a highly deviated well (maximum deviation of 85deg).
Both jobs were successfully executed as per plan. The tool was conveyed smoothly across the tight carbonate reservoir to the target depth of 10,030 ft MD at an average tractoring speed of 1800 ft/hr. The job was concluded with a cumulative tractoring footage of 3200 ft and an operating time of 12.5 hours, which resulted in more than 30 hours of rig time savings compared to other alternatives. The requested pressure program was achieved. Due to the pressure tool's low rate pretest capability, in addition to the flexible volume and pretest time options; stabilized formation pressure data could be acquired2,3. The precise depth control resulting from this conveyance method enabled accurate pressure profiling. Similarly, the second job was conveyed smoothly to the target depth.
The combination of the advanced pressure measurement with a state-of-the-art open hole tractor1 conveyance method has proved to be an efficient and effective alternative to LWD and drill pipe in a challenging horizontal and highly deviated environments (the first job of its kind in the region). It resulted in acquiring accurate pressure data with significant rig time saving, and proved to be a cost effective solution contributing to an overall reduction in the well cost per barrel.
Density and Viscosity Prediction of Super Lightweight Completion Fluid SLWCF at Reservoir Conditions
Authors: Amir Zulhelmi , Jan Badrul Mohamed , Wahab Ahmad Khairi , Khalil Munawar , Ali Brahim Si , Tong Chong Wen , Sareh Mohd Kamal , Shafi'i Mohd Rashidi 
Published: August 2016

Abstract
This paper presents the effect of reservoir conditions, specifically temperature and pressure, on the rheological behavior and density of super lightweight completion fluid (SLWCF) for underbalanced perforation. In this study, fluid's density was measured at various temperatures and pressure ranging from 313.15 K to 393.15 K, and 0.1 MPa to 25 MPa, respectively. Meanwhile, fluid's viscosity was measured at temperature between 298.15 K to 373.15 K, and pressure range of 0.1 MPa and 4.48 MPa. In order to understand the effect of reservoir conditions to the density and viscosity of the fluid, experimental data were fitted to several density-/viscosity-temperature-pressure models and then the generated results were statistically evaluated. Based on the results, it is observed that the Tait-like equation was able to satisfactorily express the relationship between the density, pressure and temperature. The predicted density values based on the Tait-like equation are also in good agreement with the regressed model results. For the case of fluid's viscosity, it is found that both modified Mehrotra and Svrcek's and Ghaderi's equation were the best equation for viscosity prediction. Using these equations, it is statistically possible to predict the variation of fluid's density and viscosity over the wide range of pressure and temperature. Furthermore, it is also found that the predicted density and viscosity values are very close to the experimental data with very low deviation. This confirmed the reliability and accuracy of the prediction. This paper provides a novel data prediction of rheology and density of Saraline-based SLWCF at reservoir conditions for the purpose of underbalanced perforation. This result is essential as a tool for field engineers to roughly estimate the density and viscoplasticity of completion fluids as they subjected to reservoir conditions.
A Well Control Approach with Managed Pressure Drilling MPD on HPHT Wells in Vietnam - Case History
Authors: Quoc Bao Ta , Yong Tan Chai , Singh Harpreet Kaur , Nguyen Vi Pham 
Published: August 2016

Abstract
Managed Pressure Drilling (MPD), with the installation of Rotating Control Device (RCD) and MPD Choke has been identified as an time saving value added technology to two different operators in Vietnam when mitigating well control situations.
Conventional well control approach is to shut in the annular BOP and circulate out influx by using either the Driller's or Weight & Wait methods. However, these methods can only be used when the bit is on bottom and circulation is possible. In cases when it is unsuitable to use the standard well control methods, alternative such as: stripping to maintain BHP constant plus Volumetric to control gas migration to surface is considered.
Referencing two HPHT wells drilled in offshore Vietnam with MPD equipment; both influxes were encountered when the bit was completely out of the hole and the other when the bit was halfway from bottom of the well. The operators used the RCD bearing assembly and the MPD Choke Manifold to strip the drillstring back to total depth and performed standard well control procedures. The MPD stripping technique allowed the operators to regain well control, enhanced operational safety and significant time savings.
This paper will discuss the methodology of MPD well control techniques based on the experience from the two HPHT wells in Vietnam. The main objectives of the paper is to define, document, and develop workflows to successfully implement well control procedures using MPD in future HPHT wells.
Dual Hole Enlargement in Deepwater Exploration – Case History From 12-1/4? to 20? and 17-1/2?
Authors: Rios Renato , Najmi Nik Fahusnaza , Hieu Pham Nam , Irvine Don , Johnstone Kris , Nicolson James 
Published: August 2016

Abstract
The advances of borehole enlargement (BHE) technology have been a game changer for deepwater well construction in the recent years, allowing larger OD casing strings to reach ever-increasing depths. Among the many reasons why this operation might be required, the potential of a geological structure to have hydrocarbon bearing formations from shallow to deeper depths entails different and challenging operational well construction alternatives, each one with its trade offs. It might be the case that in aiming to strike balance between achieving the formation evaluation goals and allowing a feasible and cost effective well construction, a pilot hole and subsequent hole enlargement strategy might be selected.
This paper presents a case study of two consecutive hole enlargement sections (12-1/4″ × 20″ and 12-1/4″ × 17-1/2″) on a deepwater wildcat well offshore South East Asia. Whilst not a novel procedure, performing such operations in a single run to accommodate large casing sizes in deepwater well construction, working from pre-drilled 12-1/4″ pilot holes, is uncommon. Several challenges associated with drilling dynamics, drilling performance, hole quality and barrier integrity were overcome by the application of hole enlargement technology, rigorous planning and operations workflow.
Best Practices and Lessons Learned on the Application of Managed Pressure Drilling MPD Technology For High Pressure High Temperature HPHT Wells in Vietnam
Authors: Quoc Bao Ta , Yong Tan Chai , Singh Harpreet Kaur , Nguyen Vi Pham , Minh Ho Chi 
Published: August 2016

Abstract
With the surmounting call of cost cutting measures within the oil and gas industry, it is of paramount importance to examine and evaluate the drilling activities during the course of the application of Managed Pressure Drilling (MPD) technique for High Pressure High Temperature (HPHT) wells globally. The cost reduction has also affected wells drilled in Vietnam.
One common discussion amongst operators to decide on MPD system installation for a drilling campaign is the significant upfront cost associated with the technology. However, through detailed cost benefit analysis and carefully examining the previous lessons learned and extract the best practices in order to apply it for future wells; the benefits in operational safety, drilling optimization, NPT reduction through the use of MPD, significantly outweigh its cost.
The paper will discuss the lessons learned, best practices and experience of MPD technology based on HPHT wells drilled in Vietnam.
Specifically, it will examine what went well on the following: Preparations for MPD in a HPHT environmentMPD equipment requirement and design for the specific MPD applicationRigging upMPD equipmentSelection of sealing element for HPHT wellsHPHT drilling with MPDPumping out of hole vs. pulling out of hole with surface back pressure (SBP)Well control scenario when drill String is out of hole
Case Study: Kazakhstan's First Application of Inflow Control Devices ICDs for Horizontal Wells
Authors: Smith Chris , Dehghani Ali , Hatcher W. B. , Mukhambetpaizov Yesset , Askarov Bakhtiyar , Burg George 
Published: August 2016

Abstract
This Paper describes the challenges and successful application of Inflow Control Devices ("ICDs") combined with sand control screens for horizontal wells. The ICDs were installed to reduce water and gas coning at the Shoba field. Shoba was the first field in Kazakhstan to use ICD technology and the first field in the Pre-Caspian basin where shallow horizontal wells were drilled.
The Shoba field is located within the Zharkamys West 1 block in western Kazakhstan. The Triassic-age sandstone reservoir consists of sweet 34° API oil. The field was initially developed with seven (7) vertical wells. However, high vertical permeability, in combination with high gas and water mobility, resulted in excessive gas and water breakthrough that marginalized the field's economics. An alternate development plan utilizing ICDs and horizontal well technologies was necessary to enhance field commerciality. This project presented numerous challenges. Since the field is relatively small and wells of this type had not been drilled in the region, there was little opportunity for a "learning curve", no margin for excessive cost over-runs, or well failures. Some of the issues overcome that will be presented: ICD design and selection considerationsWellbore instability for shallow horizontal wellsIsolation of a sizable gas cap above the productive oil zonePlugging of the sand control screens during their placementPremature gas or water coning
Shoba's first two horizontal wells were drilled and completed on time and under budget, with early results confirming a reduction of water and gas coning. A significant increase in production rates has also been realized. Given the project's initial success, additional horizontal well development drilling continues.
Proving the Value of Logging-While-Drilling Seismic Technology in a Challenging Offshore Exploration Setting
Authors: Ahmed Aqil , Soh Azrin , Morris Luke , McMahon Tim , Fernandez Manuel 
Published: August 2016

Abstract
This paper highlights the value of seismic while drilling to successfully drill a vertical exploration well offshore Malaysia when faced with an expected pressure ramp in the shallow section and a gas chimney in the deeper section disrupting the surface seismic image data.
Using a dual tool Logging While Drilling (LWD) seismic configuration enabled real time Vertical Seismic Profile (VSP) imaging and velocity data for accurate casing point selection, hazard avoidance and successful well construction and enabled elimination of a planned casing string.
The seismic while drilling was conducted from seabed down to final well Total Depth (TD) to acquire a time-depth relationship for the entire wellbore. Acquisition was conducted during connections, an acoustically quiet period when the seismic shots are fired and downhole receivers in the seismic collar are recording. Transmission of the real time data starts when the connection is complete, and the mudpulse telemetry resumes with the drilling. Seismic waveforms sent to surface after each connection were processed for checkshots and VSP image successively after each seismic acquisition level.
Critical 20 inch casing point was accurately set within 20m of identified hazards, despite an initial uncertainty of 100m predrill. The VSP image data was superior to the surface seismic image, recording clear reflectors within a disrupted gas zone, with better phase and frequency content. Full velocity profile over the whole well interval with 15m definition was acquired and processed. The character differed from the initial predrill model and offset well information significantly.
Seismic while drilling removed the need for a pilot hole, and optimized the 20 inch casing point. Accurate real time velocity information allowed for accurate time to depth conversion for drilling decisions i.e. to assist in navigating the shallow pore pressure ramp, casing point setting and providing better seismic imaging in the gas chimney. This case study highlights one of the first applications of real time VSP data enabled by the use of two seismic tools placed 15m apart in the Bottom Hole Assembly (BHA).
Initial Experience with Renal Denervation for the Treatment of Resistant Hypertension - The Utility of Novel Anesthetics and Metaiodobenzylguanidine Scintigraphy (MIBG)
Authors: Ziakas Antonios , Petroglou Dimitrios , Moralidis Efstratios , Tsioufis Konstantinos , Doumas Mihalis , Argiriadou Elena , Savopoulos Christos , Hadjimiltiades Stavros , Stiliadis Ioannis , Kouparanis Antonios , Katranas Sotirios , Lillis Leonidas , Koutsakis Athanasios , Karvounis Haralambos 
Published: August 2016

Background:The Symplicity-HTN 3 trial failed to show significant difference in blood pressure (BP) lowering between patients undergoing catheter-based renal denervation (RDN) and the sham-procedure arm of the study. However, there is still optimism about the role of RDN in the treatment of resistant hypertension, because identification of patients with increased sympathetic activity thus being good RDN responders, improvements in the RDN procedure and new technology RDN catheters are all expected to lead to better RDN results. We present our initial experience with RDN for the treatment of resistant hypertension, and the utility of novel anesthetics and cardiac123I-metaiodobenzylguanidine scintigraphy (123I-MIBG).Methods and Results:Seven patients with resistant hypertension underwent RDN and were followed up for 6 months. MIBG was performed before RDN, in order to estimate sympathetic activity and predict the response to RDN. All patients were sedated with dexmedetomidine and remifentanil during RDN. All patients tolerated the procedure well, were hemodynamically stable and their peri-procedural pain was effectively controlled. A median of 7.6 ± 2.1 and 6 ± 1.4 ablations were delivered in the right and left renal artery respectively, making an average of 6.8 burns per artery. No peri-procedural or late complications - adverse events (local or systematic) occurred. At 6 months, mean reduction in office BP was -26.0/-16.3 mmHg (p=0.004/p=0.02), while mean reduction in ambulatory BP was -12.3/-9.2 mmHg (p=0.118/p=0.045). One patient (14.3%) was a non-responder. None of the cardiac123I-MIBG imaging indexes(early and late heart-to-mediastinum (H/M) count density ratio, washout rate (WR) of the tracer from the myocardium) were different between responders and non-responders.Conclusion:Patients with resistant hypertension who underwent RDN in our department had a significant reduction in BP 6 months after the intervention.123I-MIBG was not useful in predicting RDN response. Dexmedetomidine and remifentanil provided sufficient patient comfort during the procedure, allowing an adequate number of ablations per renal artery to be performed, and this could probably lead to improved RDN results.
Como sociólogo se puede hacer de todo, sin quedar encasillado en un ámbito temático
Authors: Rodriguez Dario , Silva Artur Stamford Da 
Published: August 2016

Escribir la trayectoria intelectual de Niklas Luhmann es aclarar puntos centrales de una teoría de la sociedad que no tiene clasificación en términos de los modelos teóricos da sociología actual. Así es porque Luhmann no transfiere ideas de autores y teorías a su teoría de la sociedad, pero sí las reformula y revisita para darles lugar en su teoría de la sociedad como sistema de comunicación. Con esto objetivo, presentamos cómo ha sido posible a Luhmann producir la teoría de la sociedad pautada por las novedades de la teoría de sistemas de los años 60. Escribir la trayectoria intelectual de Niklas Luhmann es aclarar puntos centrales de una teoría de la sociedad que no tiene clasificación en términos de los modelos teóricos da sociología actual. Así es porque Luhmann no transfiere ideas de autores y teorías a su teoría de la sociedad, pero sí las reformula y revisita para darles lugar en su teoría de la sociedad como sistema de comunicación. Con esto objetivo, presentamos cómo ha sido posible a Luhmann producir la teoría de la sociedad pautada por las novedades de la teoría de sistemas de los años 60.