bluuebunny/crossref_metadata_2025_split huggingface dataset:
RANCANG BANGUN KONTROL PID PADA SPEED OBSERVER GENERATOR DC BERBASIS ARDUINO UNO
Authors: Adi P. M. Galih x , Kaloko Bambang Sri 
Published: January 2018

In this study discusses the development of observer to the generator speed direct current (DC) that is controlled using the rotary encoder sensor built using the Arduino UNO with recording capability of the two systems is also compared. Testing is done to see readings observer error indicates that the observer is sufficient with an average error of 0.81% of the speed sensor readings in this case be used as a standard. Application of PID control as the control of the speed observer DC generators that keep the generator speed setpoint despite the load current increases. Referring to the curve of speed and power relations in the prime mover speed setpoint is to improve the reliability and performance of the DC generator. PID control makes speed generator is stable at voltage setpoint. PID parameters used are Kp = 0.77, Ki = 0.0083 and Kd = 0.0096. After applying PID control value obtained rise time of 0.51 s, the steady-state error 1:28%. Testing is done by giving a resistive load to the setpoint speed of 1500 rpm, 2000 rpm and 3000 rpm and load variations that are used 50 Ω and 25 Ω. For steady-state error value obtained supreme 17:21% when the setpoint of 3000 rpm and the lowest was 0.004% at 2000 rpm setpoint. The highest value of recovery time on a setpoint of 3000 rpm that can not be returned to the setpoint and the lowest was 0.6 s current setpoint 1500 rpm.
Keywords: Arduino Uno R3, DC Generator, PID, Speed Observer
DAMPAK KOMODIFIKASI TERHADAP PERUBAHAN IDENTITAS TARI TOPENG HITAM
Authors: Agusta Tessaniva , Warto Warto , Supana Supana 
Published: January 2018

<p><em>This Study discuss the impact of co-modification of topeng hitam dance as cultural attraction in Ngrawan Village Semarang Regency The results show that co-modification has been taken place since 2012 which was done by the parties concerning with the development of topeng hitam dance which is potential to be a cultural tourism asset. Consequently, it will, economically, give benefits to the people of Semarang Regency; especially for people of Ngrawan Village where the dance originated from, and also, the local tourism agencies. However, despite the beneficial fact in the tourism sector, the co-modification process devastates the historical values and the value of identity of topeng hitam dance due to the commercialization.</em></p><p><em> </em></p>
Laboratory Measurement of Microproppant Placement Quality using Split Core Plug Permeability under Stress
Authors: Kim Brice Y. , Akkutlu I. Yucel , Martysevich Vladimir , Dusterhoft Ron 
Published: January 2018

Abstract
This paper describes the stress-dependent permeability of split shale core plugs from Eagle Ford, Bakken, and Barnett formation samples studied in presence of microproppants in microcracks. An analytical permeability model is developed, including the interaction between the fracture walls and monolayer microproppants under stress. The model is then used to analyze a series of pressure pulse decay measurements of the propped shale samples in the laboratory. The analysis provides the propped fracture permeability of the samples and predicts a parameter related to the quality of the proppant areal distribution in the fracture. The proppant placement quality can be used as a measure of success of the delivery of proppants into the fractures and to design stimulation in the laboratory.
Case History of Completion Optimization in the Utica
Authors: Cipolla Craig , Gilbert Constance , Sharma Aviral , LeBas John 
Published: January 2018

Abstract
This paper details the results from a comprehensive study to evaluate completion effectiveness and optimize field development in the Utica. Optimizing the number and location of perforation clusters, number of stages, and treatment size requires a clear understanding of how these parameters affect fracture geometry and well productivity. The goal of this work was to determine how the number of perforation clusters per stage and treatment size affect fracture geometry and well productivity, and to integrate these results into the overall field development optimization.
A comprehensive evaluation of plug and perf (PNP) and controlled entry point (CEP) completions and treatment size was performed using a five-well pad in the Utica (wet gas area). The evaluation included PNP completions with 3-4 perforation clusters and CEP completions with 1-2 perforation clusters. Treatment size was varied by a factor of two to evaluate the effect of fluid volume on fracture length. Microseismic data were gathered on 81 PNP stages and 95 CEP stages. The microseismic data were used to calibrate hydraulic fracture models. Fracture geometries for the five-well pad plus a direct offset well (a six well total of 250+ stages) were discretely gridded in a reservoir simulation model. The reservoir simulation model was calibrated by history matching 14+ months of production data. Proppant Tracer data and DFIT measurements from previous Utica work were used to support the hydraulic fracture modeling and reservoir simulations.
The microseismic data provided a clear understanding of the relationship between treatment size and fracture length for each completion scenario. The results indicate that fracture length may be dependent on completion type, with CEP completions showing less fracture length than PNP completions. Simple production comparisons and detailed reservoir simulation history matching showed that (1) well productivity is governed by the number of perforation clusters, with PNP wells outperforming CEP wells and (2) well-to-well communication is evident. This work did NOT identify any gross inefficiencies with PNP completions and suggests that CEP completions do NOT result in better productivity, at least in this Utica pad.
The calibrated models were used to optimize perf cluster spacing, treatment size, and well spacing for PNP completions. The optimization results are summarized in the paper, but the focus of the paper is the evaluation of PNP and CEP completions, characterization of hydraulic fracture length-volume relationships, and calibration of hydraulic fracture and reservoir simulation models.
Prudent Design of Experiment with Integrated Diagnostics Improves Understanding of Multiwell Stimulation Effects in a Complex Multibench Reservoir
Authors: Sahdev Neha , Doucette Jon , Odegard Mark , Ohlson Carles , Bagherian Ben , Stark Price , Salas Wendell , White James 
Published: January 2018

Abstract
This paper demonstrates how multiple diagnostics, when applied effectively, can help accelerate the learning curve in an area and optimize field development. The operator can obtain exceptional knowledge concerning which technologies to choose when targeting specific issues for future developments.
The project involved a wine-rack of wells completed in Niobrara A, B, and C benches. Learning objectives for this project included the completions order, height growth in various benches, well spacing, well lateral landing, effect of varying treatment type and size, and cross-well communication. An extensive survey was performed of the various diagnostics available for fracture mapping, which included both near-wellbore (NWB) and far-field diagnostics. Keeping the primary learning objectives in mind, a project matrix was developed incorporating a variety of diagnostics focused on specific objectives. Inferred vs. direct measurement from diagnostics was considered. This process of "design of experiment" is discussed. The wells on the pad were all hydraulically fractured, and then the entire pad was moved to production phase post the hydraulic fracturing operations. Different fracturing fluids were also evaluated as part of the experiment.
The final project included far-field diagnostics, such as downhole microseismic, downhole fracture height, surface microdeformation, and interferometric synthetic aperture radar (inSAR), and NWB diagnostics, such as permanently installed fiber optics and radioactive (RA) tracers. The analysis was performed on individual diagnostics independently, and subsequently combined interpretations led to better subsurface understanding. Additionally, surface microdeformation data provided significant insight into the effects of "zipper fracturing" and how the treatment order of the wells was important for optimization.
With all data available, a fracture model history match on the permanent fiber optics well was constrained to the measured diagnostics. The final match between the aerial deformation from the surface tilt and calibrated fracture model was excellent and is discussed further.
Understanding the actual hydraulic fracture geometry is important in any unconventional field development because it dictates the stimulated reservoir and drainage patterns. While understanding the effects of various parameters (treatment type, fluid type, stage lengths, number of perforation clusters, etc.) on fracture geometry is essential, it is also important to understand the effect of multiple wellbores on a well pad.
Qualifying Diversion in Multi Clusters Horizontal Well Hydraulic Fracturing in Haynesville Shale Using Water Hammer Analysis, Step-Down Test and Microseismic Data
Authors: Panjaitan M. L , Moriyama A. , McMillan D. , Dunaeva A. , Rutledge L. , Xu J. , Parkhonyuk S. , Kabannik A. , Korkin R. , Warren M. , Shanmugam V. 
Published: January 2018

Abstract
It is well accepted by the Oil and Gas industry that approximately 30%-40% of perforations or perforation clusters do not contribute to the production of a multi-stage fracturing stimulated well. Diversion is a common method to maximize the wellbore coverage. The objective of this study is to evaluate and maximize the effect of diversion in multi-cluster horizontal well hydraulic fracturing applications using water hammer profile analysis, step down test and microseismic monitoring.
In this study, the authors demonstrated integrated approach for the well stimulation efficiency evaluation. A number of methods have been used for analysis: First, step-down tests after each stage have been used to estimate perforations accepting fluid. Second, innovative method of the high frequency surface pressure record analysis was used to detect diversion. Additionally, microseismic monitoring was used as an independent measurement that allows to validate the results.
Eight wells were hydraulically fractured with multiple clusters per stage. Each stage is separated either by frac baffles or plugs. Diverter was pumped to promote more uniform wellbore stimulation. Shut- in procedure was implemented after each diverter step. Signatures of water hammer during shut-in are recorded by high frequency pressure gauge and analyzed in real-time using advanced algorithm from speech processing domain. Locations of clusters receiving fluid were calculated and diversion results are qualified. Microseismic measurements in some of the evaluated wells and step down tests are also performed to qualify the diversion process. All of these measurements were done in real-time and utilized to maximize the number of frac propagations, which will have a positive impact on production. This engineering technique allows the operator to make informed real-time decision based on the effectiveness of inter-stage isolation and diversion. Small footprint high frequency pressure monitoring (HFPM) allows the optimization of cost/BOE ratio.
Case Studies of High Viscosity Friction Reducers HVFR in the STACK Play
Authors: Dahlgren Kyle , Green Brett , Williams Brandon , Inscore Josh , Domelen Mark Van , Fenton Angie 
Published: January 2018

Abstract
High viscosity friction reducer (HVFR) as a completions fluid has been tested in many premier plays in North America, such as the Bakken, Permian and Eagle Ford basins (Van Domelen et al. 2017). Increasing popularity due to production output and operational efficiencies have led to the first trials in the developing STACK play. This paper will describe the applications, observations and results from those field trials.
Three unique case studies were identified as optimal tests for the fluid. The first includes two nearly identical offset horizontal wells in terms of landing target, location, and completion designs. The lone differing variable between the two wells was a substitution of HVFR for gel, both linear and crosslink, in the pump design. The second case describes an application in an extended-reach lateral within thinning pay to optimize economics in stressed areas. The last case includes a horizontal lateral in the geologic heart of the play with consistent well results in surrounding sections.
Over the course of the three case studies, numerous benefits of the HVFR fluid system began to emerge. Operational efficiency was the earliest success, found by both the completion engineers and foremen, from reducing chemicals on location to pump design simplicity for the operator and stimulation company. Secondly, cost savings were realized due to the decreased number of chemicals required, ability to place high sand concentrations, and flexibility to reduce chemical concentrations during the completion as experience with the fluid increased. Lastly, well flowback exhibited the potential for equal or better production using HVFR over linear and crosslinked gels, theoretically due to the higher regained conductivities found in HVFR testing.
This paper showcases the potential for a relatively new treatment fluid which delivered increased efficiencies in an emerging North American asset. The same efficiencies provided by this system can potentially be realized through applications in other basins.
Contribuições do 1º e 2º Simpósios de Gestão Ambiental para a formação e regulamentação profissional dos gestores ambientais do Rio Grande do Sul
Authors: PRINTES Rodrigo Cambará , STELMACH Júlio César da Silva , ANDRADES-FILHO Clódis de Oliveira 
Published: January 2018

O que motivou a organização do 1° e 2° simpósio de gestão ambiental (SiGA)? Houve continuidade? Que avanços ocorreram em relação às questões motivadoras? Dois aspectos fazem parte das motivações iniciais:1) a demanda de adequar o currículo dos cursos de gestão ambiental aos padrões do Ministério da Educação; 2) a necessidade da Universidade de formar profissionais qualificados num mundo em transformação. A ideia de organizar o 1° SiGA surgiu nas reuniões do Laboratório de Gestão Ambiental e Negociação de Conflitos (GANECO). Professores e alunos do GANECO, com a colaboração dos funcionários da UERGS, organizaram o 1° SiGA entre 30/11 e 02/12 de 2012, em São Francisco de Paula, Rio Grande do Sul, Brasil. O público alvo foram acadêmicos de gestão ambiental, gestores, professores e outros profissionais. Foi aberto à comunidade e procurou abordar temas de interesse coletivo. A realização do 2° SiGA, de 05 e 07/09/2014 e a do 3° SiGA, entre 06 e 08 de abril de 2017, respondem positivamente à segunda questão. Os principais resultados do 1° SiGA foram a elaboração da Carta da Serra, que visava estabelecer as bases para a fundação de uma associação gaúcha de gestores ambientais, e o lançamento do Curso de Bacharelado em Gestão Ambiental da Uergs. O principal resultado do 2° SiGA foi a fundação da AGGA (Associação Gaúcha dos Gestores Ambientais). A questão da regulamentação da profissão de gestor ambiental está na essência da criação do SiGA. O SiGA contribuiu para que a Uergs cumprisse sua missão institucional e social.
Relationship Between Knee Extensors Power Output and Vastus Lateralis EMG Activation in Elderly Women: Influence of Mother Wavelet Selection
Authors: Pinho João Pedro , Mezêncio Bruno , Porras Desidério Cano , Serrão Julio Cerca , Amadio Alberto Carlos 
Published: January 2018

Purpose:The main objective of this study was to compare frequency parameters produced by six mother wavelets pinpointing the most feasible to investigate electromyographic (EMG) parameters while producing knee extension power in elderly women. The influence of different load conditions in mother wavelet selection and power output were also analyzed.Methods:Thirteen sedentary elderly women (69.3 ± 4.1 years) took part in the study. Participants executed 6 repetitions of 3 load condition (30%, 50% and 70% of the maximal) with the concentric phase of the knee extension movement as quickly as possible. Kinematic data obtained by video analysis, an anthropometric model and Newtonian mechanics were used to calculate knee extensors’ power. A continuous wavelet analysis was used as a time-frequency transformation strategy of vastus lateralis and biceps femoris EMG data and six different mother wavelets were selected: Morlet; 4th, 8th and 44th order Daubechie, 4th order Coiflet and 5th order Symlet.Results:44th order Daubechie showed the highest maximal cross correlation value and no differences were seen between different mother wavelets and cross correlation at zero lag and in the lag variable. Although increased knee extensors peak power at higher loads were seen, no differences in vastus lateralis or biceps femoris root mean square values were obtained.Conclusion:44th order Daubechie mother wavelet was pinpointed as the most suitable to obtain EMG time-frequency parameters. We have also seen that different load conditions do not seem to have an influence on mother wavelet selection.
Numerical Study of Non-Newtonian Blood Behavior in the Abdominal Aortic Bifurcation of a Patient-Specific at Rest
Authors: Oliveira Carlos , Soares Armando A. , Simões André , Gonzaga Sílvia , Rouboa Abel 
Published: January 2018

Background:The interaction of blood flow with walls of blood vessels is central for the development and maintenance of cardiovascular health. The analysis of wall shear stress is, therefore, fundamental in hemodynamic studies.Objective:The aim of this work is to study numerically the influence of the shear thinning blood properties on the hemodynamics in the abdominal aortic bifurcation for a patient-specific at rest.Methods:Were tested two models for the blood dynamic viscosity, one Newtonian and other non-Newtonian, with dependence on hematocrit and total protein minus albumin.Results and Conclusion:The results show the shear thinning behavior influence on the velocity distribution and wall shear stress. Furthermore, wall shear stress values are globally lower for non-Newtonian blood model at high velocity values than those for the Newtonian blood model. However, for low velocity values this behavior is inverted.
Determinantes de la probabilidad de padecer enfermedades inflamatorias intestinales
Authors: Vásquez Harold , Vásquez Howard 
Published: January 2018

En base a un universo de 116 pacientes, realizamos un estudio observacional descriptivo transversal y de recolección de datos prospectivo con el fin de determinar la eficacia de la calprotectina fecal en pacientes conocidos y con alta sospecha de enfermedad inflamatoria del intestino. A diferencia de estudios anteriores, utilizamos una serie de modelos econométricos para estimar la probabilidad de que un paciente padezca Colitis Ulcerativa o Enfermedad del Crohn (CU-EC) dado el nivel de calprotectina detectado en las heces fecales. Los resultados indican que esta probabilidad puede diferir en magnitudes significativas dependiendo del sexo, la edad y los hábitos de consumo del paciente. Por ejemplo, en el caso de los hombres, la probabilidad de padecer CU-EC es significativamente mayor que para las mujeres, incluso en niveles bajos de calprotectina fecal. Además, la razón de probabilidades de padecer CU-EC aumenta hasta que el paciente alcanza los 37 años, edad en que la probabilidad de contraer una enfermedad inflamatoria intestinal comienza a reducirse paulatinamente. Finalmente, la probabilidad de que un paciente padezca CUEC es mayor para las personas que declaran ser fumadoras de tabaco, a pesar de que este último resultado no aparenta ser significativo en términos estadísticos.
Psychosocial problems of schoolchildren and the psychological counseling approaches implicated by counselors for treating it
Authors: Abdullah Mohammad Qassim 
Published: January 2018

The aim of this study was to examine and evaluate the behavioral problems of schoolchildren in basic education stage and the psychological counseling approaches implicated by their counselor for treating it. In addition, assessing the differences in these approaches according to the variables of gender and educational qualification/degree. The sample consisted of (240) counselors (125 male, 115 female) enrolled from five educational administrations. The procedure has been used concluded Scale constructed for assessing the behavioral problems students and psychological counseling approaches used by counselors. The instrument's characteristics scored high level of validity and reliability. The findings showed that the most common behavioral problems were disobedience of teachers underachievement, aggression. In addition, the most counseling approaches used by counselors were individual and group counseling, Leisure time counseling, rational-emotive therapy, plying counseling, reality therapy, and client-centered therapy. According to the differences in counseling approaches relating to gender and academic qualification or degree of counselors, there were no significant differences except for the approaches of cognitive, behavioral and group counseling techniques and approaches.
Does coping strategies have asignificant relationship with quality of life among caregivers of chronic illness patients?
Authors: Aren Merican , Rahim Nurlatifah , Kasuma Jati 
Published: January 2018

The present study aimed to investigate the coping strategies and quality of life among caregivers of chronic illness patients. The study was conducted among the caregivers from five (5) villages in Sibu District of Sarawak by using a survey research design. A total of sixty seven (67) participants were participated in this study. Two different instruments were used to measure different types of variables. Research data collected was tested and analyzed by using a descriptive statistic and Pearson Correlation. The result revealed that there was a significant relationship between the coping strategies and the quality of life among caregivers of chronic illness patients. The relationship between both coping strategies and domains of quality of life was in a moderate level. As an implication, counselors should be more aware about the types of coping strategies used by the caregivers because it can affect the individual’s quality of life indirectly.
Peningkatan Kemampuan Membaca Permulaan melalui Metode SAS (Struktur Analitik Sintetik) Bagi Anak Berkesulitan Belajar Membaca di Sekolah Dasar
Authors: H Lina Widya 
Published: January 2018

Penelitian ini bertujuan untuk mengetahui peningkatan kemampuan membaca permulaan melalui metode SAS (Struktur Analitik Sintetik) bagi anak berkesulitan membaca di SDN Bangunrejo 2 Yogyakarta. Penelitian ini menggunakan pendekatan kuantitatif dengan jenis penelitian tindakan kelas. Subjek penelitian adalah seorang anak berkesulitan belajar membaca permulaan. Penelitian dilakukan dalam dua siklus tindakan. Data dalam penelitian ini dikumpulkan dengan menggunakan metode tes, observasi, wawancara, dan dokumen. Sedangkan instrument yang digunakan meliputi instrument tes kemampuan belajar membaca permulaan, pedoman observasi, dan panduan wawancara. Data yang terkumpul dianalisis dengan secara kualitatif dan kuantitatif. Hasil penelitian menunjukkan bahwa setelah diterapkan metode SAS (Struktur Analitik Sintetik) selama 2 siklus dapat meningkatkan kemampuan membaca permulaan anak berkesulitan belajar membaca. Peningkatan kemampuan membaca permulaan pada pasca tindakan I peningkatan sebesar 6,6% dengan nilai awal 56,7 menjadi 63,3. Sedangkan peningkatan kemampuan membaca permulaan pada pasca tindakan II peningkatan sebesar19,97% dengan nilai awal 56,7 menjadi 76,67.