bluuebunny/crossref_metadata_2025_split huggingface dataset:
Predatory Journals : Do Not Enter
Authors: Khan Faizan , Moher David 
Published: February 2017

AbstractThe escalation in open-access publishing has fueled the rise of questionable businesses, namely, ‘predatory’ journals. Predatory journals and their publishers seek manuscripts through aggressive electronic solicitation and execute flawed peer-review practices, consequently undermining the scholarly record and current research cultures, globally. As these journals are not indexed in any legitimate databases, the research they publish is often undiscoverable and fails to be disseminated to a worldwide readership. Acknowledging this threat to the credibility of science, this article aims to alert researchers at various levels of their career of the increasing global issue of predatory journals, and offer helpful advice and resources for identifying and avoiding them. RésuméL’essor de la publication en accès libre a alimenté l’expansion d’entreprises douteuses, à savoir des revues « prédatrices ». Les revues prédatrices et leurs éditeurs recherchent des manuscrits au moyen de requêtes électroniques agressives et effectuent des évaluations erronées par les pairs, compromettant ainsi les archives scientifiques et les présentes cultures de recherche dans l’ensemble. Puisque ces revues ne sont pas répertoriées dans des bases de données légitimes, la recherche qu’elles publient est souvent introuvable et ne parvient pas à être diffusée à un lectorat mondial. En reconnaissant cette menace à la crédibilité scientifique, cet article vise à alerter les chercheurs à diverses étapes de leur carrière du problème global croissant que constituent les revues prédatrices, et à leur offrir des conseils utiles et des ressources permettant de les identifier et de les éviter.
Evaluation of perinatal outcome in women presented with first trimester vaginal bleeding: our experience
Authors: Rai Priyanka , Kumari Girija , Kumari Kalpana , Jaiswal Deepshikha 
Published: February 2017

Background: First trimester vaginal bleeding (FTVB) plays a role in occurrence of late pregnancy complications in both mother and infant. Late pregnancy outcomes in mothers and infants are the main concerns for the obstetricians. The purpose of this study was to assess the perinatal outcome of pregnancies complicated by first trimester vaginal bleeding.Methods: The present study included total 100 singleton pregnant women with history of FTVB whose pregnancy was confirmed chemically. Patients were closely observed and follow up done 2 weekly upto 36 weeks and weekly after that. Late pregnancy outcomes such as gestational hypertension, pre eclampsia, placental abruption, preterm delivery and pre mature rupture of membranes in the mothers and low birth weight, intrauterine growth ristriction, apgar score after 1 and 5 minutes, and NICU admission in new born were calculated.Results: Incidence of PROM, gestational hypertension and placental abruption is more in women with FTVB. However there infant had higher rate of IUGR and LBW. Apgar score after 1 and 5 minutes were less than 5 and admission to NICU too.Conclusions: FTVB is an important factor to predict both the maternal and fetal outcomes in late pregnancy. It is therefore important to evaluate and consider these pregnancies as high risk group and provide careful antenatal care.
Medicinal Value of Curcuma cassia roxb: An Overview
Authors: Bhupendra Sahu  , Rameshroo Kenwat  , Shashikant Chandrakar  
Published: February 2017

Curcuma caesia is commonly known as kali haldi and it belongs to the family Zingiberaceae. Black turmeric is an uncommon endemic as well as ethno medicinally important of South East Asia. This herb is available throughout north-east, central India, Papi Hills of East Godavari, West Godavari, and Andhra Pradesh. In the traditional system of medicine, fresh and dried rhizomes of Curcuma caesia are used in treating leucoderma, asthma, tumours, piles, bronchitis, bruises etc. Curcuma caesia has scientifically studied for various therapeutical activities like antioxidant, antibacterial, antipyretic, larvicidal, insecticidal, antimicrobial, wound healing and anti-hyperglycaemic. The present review is an effort to give a detailed survey of the literature on its, phytochemistry, traditional uses and therapeutical studies.
Implementation method experiments on student results on substances being material and its amendment in class VII SMP Negeri 22
Authors: Trisianawati Eka , Nurhayati Nurhayati , Beniwati Lusi 
Published: February 2017

<p class="Abstract">The aims of this research were to know: (1) the average student learning outcomes in states of matter and changes the material that is taught by an experimental method in class VII SMP Negeri 22 Pontianak; (2) the average student laerning outcomes in states of matter and changes the material that is taught by conventional method in class VII SMP Negeri 22 Pontianak; (3) the average difference in student learning outcomes given the experimental method to the average student learning outcomes given conventional methods in states of matter and changes the material in class VII SMP Negeri 22 Pontianak . This research was a quasi-experimental design with Nonequivalent Control Group Design. The study population was all students of class VII SMP Negeri 22 Pontianak which consists of five classes, namely class VII A, VII B, VII C, VII D and E VII academic year 2015/2016, with a sampling technique that cluster random sampling. Based on the results of class VII A<a class="r021x1x42O7 " title="Click to Continue &gt; by Not set" href="#43308853"> lottery<img src="https://cdncache-a.akamaihd.net/items/it/img/arrow-10x10.png" alt="" /></a> was chosen as an experimental class and class VII D as the control class. The data collection technique used is the technique of measurement. Data collection tool used is a form of essay test. The hypothesis was tested using the t-test. Based on the results of data analysis can be concluded that: (1) the average student learning outcomes in states of matter and changes the material that is taught by an experimental method in class VII SMP Negeri 22 Pontianak is 64.96, (2) the average student learning outcomes in material states of matter and the changes that are taught by conventional methods in class VII SMP Negeri 22 Pontianak is 49.85, and (3) there are differences in the average student learning outcomes given the experimental method to the average student learning outcomes given in the conventional method material phase transition and changes in class VII SMP Negeri 22 Pontianak.</p>
Peranan Sifat Fisikokimia Sorgum dalam Diversifikasi Pangan dan Industri serta Prospek Pengembangannya
Authors: Suarni Suarni 
Published: February 2017

<p>Pemanfaatan sorgum untuk pangan dan industri dari bahan setengah jadi (sorgum sosoh, tepung, dan pati) sebaiknya berlandaskan pada karakter sifat fisikokimia. Hasil penelitian menunjukkan bahwa setiap varietas sorgum memiliki sifat fisikokimia dan komponen bioaktif fungsional yang berbeda. Informasi ini dapat menjadi pertimbangan awal dalam memilih varietas sorgum sesuai dengan produk yang diinginkan. Berbagai inovasi teknologi produk pangan dan industri berbasis sorgum, termasuk gula cair dan bioetanol dari batang sorgum manis telah dihasilkan. Untuk mempromosikan sorgum sebagai bahan diversifikasi pangan dan industri yang prospektif, diperlukan dukungan riset, iptek, dan kebijakan. Tersedianya varietas unggul sorgum, yang didukung dengan inovasi teknologi pengolahan pangan dan industri yang memadai, menjadikan komoditas ini potensial untuk dikembangkan.<br /> </p>
Does Unit-Slope Beyond Maximum Producing Time Always Represent BDF in RTA?
Authors: Hasan S. S. , Mattar L. 
Published: February 2017

Abstract
Production data is usually analyzed by plotting the normalized rate (q/Δp) Vs. Material Balance Time (MBT) on a log-log scale. A late-time unit-slope is usually interpreted as boundary-dominated flow (BDF) and can be used to calculate the reservoir volume. However, a decreasing flow rate not only causes MBT to be larger than Maximum Producing Time (MPT), in certain cases it can also create an artifact of false unit-slope giving the wrong impression of achieving BDF. There are claims in the literature (Agnia et al., 2012) that all data beyond MPT should be ignored.
This paper presents a detailed analysis of the issue, and investigates the conditions under which data beyond the MPT should be ignored. Three different reservoir models have been used with associated pertinent flow regimes to cover and demonstrate the subject. Specifically, it addresses questions such as: What causes MBT to be larger than MPT?; Under what conditions can that data be meaningful? and Should MBT data that extend past the MPT must always be ignored?
The question whether MBT is valid beyond MPT and under what conditions, has been investigated in great detail in this paper. The observations are that: If flow is transient, then any data beyond MPT should be ignored (except for a constant flowing pressure).If flow is boundary-dominated, data beyond MPT is valid and it accentuates the correct interpretation.To differentiate between transient and boundary-dominated flow, use of external information is often necessary.Bad data will often manifest themselves beyond MPT and should probably be ignored.
It has been shown that even when flow is transient, a unit-slope may be observed on the q/Δp Vs. MBT plot. This is a false trend and will give the wrong HCIIP. When the flow is Transient, the volume of investigation is still increasing with time, and any volume corresponds to a "minimum." Observations during this study indicate that the "calculated volume" based on the apparent (false) unit-slope data is approximately one-half of the "correct reservoir volume." However, when flow is boundary-dominated, the observed unit-slope on the q/Δp Vs. MBT plot is a true trend and will give the correct HCIIP.
Waterflooding a Multi-layered Tight Oil Reservoir Developed with Hydraulically Fractured Horizontal Wells
Authors: Hustak Crystal , Dieva Rous , Baker Richard , MacIsaac Ben , Frankiw Ken , Clark Bryan 
Published: February 2017

Abstract
A successful waterflood can be implemented in a multi-layered tight oil reservoir developed with horizontal multi-fractured wells. This paper forecasts the recovery factor that can be achieved in such a reservoir as well as discusses the challenges of analyzing and modelling tight oil reservoirs developed with multi-fractured horizontal wells.
With some unconventional reservoirs that are hydraulically fractured, a phenomenon exists whereby material balance and simulation indicate pressure support from a water source that is not always obvious. This phenomenon is believed to be related to the multi-layered silts/shales in the reservoir and is not typically seen in simulation of conventional higher permeability reservoirs (Kair &gt;10 mD). Although, the exact petrophysical nature of the silts/shale reservoir layers in this project are not well defined at this time, a successful production history match can be achived by incorporating their input into a simulation model.
Localized Reservoir Characterization Model for Hydraulic Fracturing Design in Tight Reservoirs
Authors: Olusola Bukola , Boury Nahla , Aguilera Roberto 
Published: February 2017

Abstract
Tight reservoirs with low and ultralow permeability must be successfully stimulated to produce at economic oil or gas rates. For this reason, costs of drilling and completing wells are very high in tight reservoirs. In order to reduce these costs, operators have often tried to replicate the same or similar hydraulic fracturing designs that have been successfully used in previous wells in the same geological area. This strategy sometimes results in unexpected surprises and operational challenges leading to unsuccessful stimulations and poor production performance. The major reason behind these challenges is that tight reservoirs exhibit a localized behavior with changes in reservoir quality such as mineralogy, hydrocarbon content, and thickness across the same reservoir.
In order to study the localized behavior of tight reservoirs; three wells that penetrated the Eaglebine formation in Texas were evaluated. The Eaglebine formation contains both the Eagle Ford and the Woodbine reservoirs. The combined Eagle Ford and Woodbine (Eaglebine) reservoir can sometimes exceed 1,000 feet in thickness. These reservoirs are present at depths between 6,500 and 15,000 feet in East Texas. In some areas, the Eaglebine contains a large percentage of silica-rich sands interbedded in organic rich shale and carbonate layers.
This paper investigates the reasons as to why same hydraulic fracturing techniques should not be applied necessarily for every well in the same geological area. Furthermore, it demonstrates how we can exploit the localized reservoir behavior to plan for future wells despite limited data availability. Data from mud logs, well logs, and cores, including mineralogy and geomechanical data are integrated to build the localized reservoir characterization model that can be used to plan how each individual well should be hydraulically fractured. The model provides information such as location of organic-rich zones, brittle zones, and ductile zones in a geological area. Lastly, it recommends the type of fracture fluid that can yield a successful stimulation operation in ductile or brittle zones.
Limitations of Current Type Curves in Characterizing SRV; and Development of EFR Type Curves
Authors: Barzin Yalda , Mattar Louis 
Published: February 2017

Abstract
Success of the unconventional multi-fractured horizontal well revolution depends on creation of a Stimulated Reservoir Volume (SRV). Advances in stimulation technology have been geared towards creating increasingly larger SRV's. However, the techniques for evaluating the size and shape of the SRV from production data analysis have not kept pace, and need to be improved.
In this paper, we review the diagnostic methods that are currently used, and share learnings obtained from analyzing hundreds of unconventional wells from different unconventional plays. We describe the existing specialized analyses, namely plots utilizing square-root of time (and other time functions), along with type curves that were developed for Compound Linear Flow. We demonstrate that even though these type curves do not account for SRV, they can still be used partially to learn about the SRV characteristics.
We have studied the behavior of the EFR (Enhanced Frac Region) model and show how it deviates from the Compound Linear Flow type curves. We demonstrate that what is often considered to be linear flow is only a transition between two flow regimes and results in misinterpretation of the linear flow parameters, and consequently, of SRV properties.
We have developed a new EFR type curve that helps characterize the SRV. It should provide a better understanding and interpretation of the currently accepted multi-fractured horizontal well/reservoir system, and improve the diagnostic analysis that precedes and reinforces modeling.
CO2-Oil Interactions in Tight Rocks: An Experimental Study
Authors: Habibi Ali , Yassin Mahmood Reza , Dehghanpour Hassan , Bryan Donald 
Published: February 2017

Abstract
This paper presents comprehensive rock-fluid experiments to study the possibility of oil recovery improvement when CO2 is injected as a fracturing fluid in the Montney tight-oil play, located in the Western Canadian Sedimentary Basin. This study consists of four phases: In phase 1, we conduct constant composition expansion (CCE) tests with different CO2 concentrations using a PVT cell. In phase 2, we visualize CO2-oil interactions at reservoir pressure and temperature in a custom-designed visual cell. Then, we conduct SEM/EDS analysis on the solid precipitates in the visual cell due to CO2-oil interactions. In phase 3, we soak the oil-saturated core plugs in the visual cell, pressurize the cell with CO2, and measure the oil recovery. In phase 4, we conduct cyclic CO2 tests using a core flooding system, and measure the oil recovery. We also evaluate the oil viscosity and wettability of the core plugs before and after cyclic CO2 process.
The results of the CCE tests conducted using the PVT cell and visualization tests conducted using the visual cell show that CO2 can significantly dissolve into and expand the Montney oil. The results of the CO2 soaking tests and cyclic CO2 process show that the oil swelling due to CO2-oil interactions results in high oil recovery factor from the oil-saturated core plugs. In addition, we observe solid precipitates due to CO2-oil interactions at the bulk-phase conditions in the visual cell. SEM/EDS analysis on the solid precipitates show the existence of carbon and sulfur, the main components of asphaltene. The results of IP-143 test confirm the formation asphaltene when the Montney oil contacts CO2 at reservoir conditions.
The Impact of Completion Technique on Well Performance
Authors: Anderson D. M. , Thompson J. M. , Popp M. , Behmanesh H. , Liang P. 
Published: February 2017

Abstract
There are several different technologies available for completing and stimulating multi-stage horizontal wells. By far the most common of these is to use a cemented liner with multiple perforation clusters treated simultaneously in a single stage (plug-and-perf). One alternative method gaining popularity also employs the use of a cemented liner but with sliding sleeves allowing for single point entry into the formation (pinpoint). The objective of this paper is to compare the expected and observed reservoir performance resulting from each of these approaches.
To accomplish the objectives, two methods are appliedtheoretical and experimental. The theoretical approach uses a hydraulic fracture simulator to predict fracture geometry for both plug-and-perf and pinpoint completion techniques for a predefined set of treatment parameters. A reservoir simulator is then used to predict production and ultimate recovery for each case. The experimental approach involves choosing a drilling spacing unit (DSU) where these two completion techniques have been applied (in close proximity) while controlling, or normalizing for, as many other reservoir and completion variables as possible. The well performance data is analyzed using rate transient analysis (RTA), and the results compared to the predictions made by the theoretical models.
Theoretical modeling predicts that slightly better reservoir performance ought to be obtained in pinpoint completions, over plug-and-perf. Experimental (empirical) analysis of actual well performance data supports the theoretical predictions directionally, but significantly exceeds the uplift predicted by the theoretical models. Ideally, the experimental data should be collected under controlled conditions. In reality, this is not the case as operations on a typical well pad (as is the case in this study) are continuously subjected to disturbances, unconstrained variables and incomplete and/or inaccurate measurements. Thus, results from RTA are somewhat subjective and error prone. The confidence of these results improve dramatically as the sample data set increases.
To our knowledge, this work represents the first objective comparison of different completion types using rate transient analysis as an evaluation tool. The experimental benchmarking procedure introduced in this work is novel and represents a significant improvement over existing industry standards for understanding how completion technology can impact well performance.
Building Type Wells for Appraisal of Unconventional Resource Plays
Authors: Miller P. , Frechette N. , Kellett K. D. 
Published: February 2017

Abstract
Building type wells for unconventional resource plays in early phases of development is a significant challenge for industry. Although the application of statistical techniques to type wells is gaining acceptance, it is often unclear to evaluators how these techniques can be applied to accurately capture the full range of uncertainty in the average single well estimated ultimate recovery for a geologic subset. This lack of clarity in proper methodology is especially apparent when very few analogue wells exist, or a very limited amount of production history is available. The objective of this paper is to present an integrated workflow that can be used to build P90, mean, and P10 type wells, which represent the range of potential outcomes for the geologic subset in an unconventional resource play. Through this workflow, the evaluator obtains an understanding of the key value drivers for a geologic subset and can compare and rank different geologic subsets. The proposed workflow is illustrated with an example from a North American unconventional play.
Investigation of Shale Pore Compressibility Impact on Production with Reservoir Simulation
Authors: Davudov Davud , Moghanloo Rouzbeh Ghanbarnezhad , Lan Yuzheng , Vice Dalton 
Published: February 2017

Abstract
This study introduces a novel outlook on a shale pore system and pore compressibility values in shale gas formations. Pore volume compressibility is one of the vital reservoir properties in order to optimize the production of hydrocarbons in an accurate way in shale formations. However, the use of pore compressibility is often oversimplified in reservoir analysis. Correcting for pore compressibility allows for improved accuracy in both geomechanic aspects and hydrocarbon reserve evaluation. In this work, we analyze pore compressibility values and its impact on production performance for several major North American shale plays.
We divide porosity of the system into accessible and inaccessible pores, and incorporate inaccessible pores with grains into the part of the rock that is not accessible. Generally speaking, accessible pores contribute to flow directly while inaccessible pores do not.
We present a mathematical model using Mercury Injection Capillary Pressure (MICP) data to determine accessible pore and inaccessible part of the rock (IRP) compressibility as a function of pressure. During MICP testing in a typical shale sample, the rock sample experiences conformance, compression, and intrusion as effective pressure increases. We characterize the compressibility value based on MICP data as a function of pressure. The calculated compressibility values for accessible pores generally appear to be much greater (two to three orders of magnitude) than those of IRP.
Next, we studied how calculated accessible pore compressibility can affect gas recovery in shale gas plays. Numerical approach is used to evaluate impact of compressibility on gas production. Reservoir compaction is generally regarded as total pore compressibility, which has a value ranging within the 10−6 magnitude. By recognizing the part of the pore system that actually contributes to production and identifying its compressibility, we can substitute total pore compressibility with accessible pore compressibility. Our results indicate that substitution of accessible pore compressibility with total compressibility can significantly change the reservoir behavior prediction. Moreover, results suggest that at initial stage high compressibility value will contribute to production significantly. However, at the same time, this high compressibility in shale matrix, will lead to pore throat closure, thus loss of connectivity at later time.
The outcome of the paper changes the industry’s take on prediction of the reservoir performance, especially the rock compaction mechanism. This study finds that shale production owing to rock compaction is in fact much greater than what has been often regarded. Having a better understanding of pore compressibility effect leads to better reservoir estimation, production prediction, and less failed wells due to economic feasibility inaccuracies.