bluuebunny/crossref_metadata_2025_split huggingface dataset:
Correlations between the active straight leg raise, sleep and somatosensory sensitivity during pregnancy with post-partum lumbopelvic pain: an initial exploration
Authors: Beales Darren John , Gaynor Odette , Harris Jasmine , Fary Robyn , O’Sullivan Peter Bruce , Slater Helen , Graven-Nielsen Thomas , Palsson Thorvaldur Skuli 
Published: October 2018

Abstract

Background and aims
For some women, lumbopelvic pain (LPP) developed during pregnancy becomes a continuing post-partum problem. Increased understanding of potential prognostic factors is required. This study investigated whether active straight leg raise (ASLR), sleep dysfunction and pressure pain sensitivity during pregnancy are correlated with LPP intensity and quality, disability, and physical health-related quality of life (HRQoL) post-partum.

Methods
An exploratory, prospective cohort study design was used. Baseline factors of interest were: (1) ASLR, (2) Pittsburgh Sleep Quality Index, and (3) pressure pain thresholds (PPTs) collected from pregnant women from sites local and distal to the lumbopelvic area. Follow-up data collected 11–18 months post-partum (n=29) were: (1) pain intensity score (numerical rating scale), (2) pain quality (McGill Pain Questionnaire), (3) disability (Pelvic Girdle Questionnaire), and (4) HRQoL (36-item Short Form Health Survey). Correlation analysis was performed.

Results
Greater difficulty with an ASLR during pregnancy correlated with lower post-partum physical HRQoL scores (r=−0.563, p=0.002). Likewise, reduced PPTs at the sacrum during pregnancy was correlated with a higher post-partum pain quality score (r=−0.384, p=0.040).

Conclusions
In this cohort, findings indicate that poor ASLR performance and localised pressure pain hypersensitivity at the pelvis during pregnancy are correlated with post-partum physical HRQoL and pain quality, respectively.

Implications
Pain sensitivity may contribute to the prognosis of women with LPP during pregnancy. These explorative findings may be important for designing larger prognostic studies and may assist in directing potential pain management in post-partum LPP.
Regression discontinuity designs with unknown state-dependent discontinuity points: estimation and testing
Authors: Yang Lixiong 
Published: October 2018

Abstract
This paper extends Regression discontinuity designs with unknown discontinuity points developed by (Porter, J., and P. Yu. 2015. “Regression Discontinuity Designs with Unknown Discontinuity Points: Testing and Estimation.” Journal of Econometrics 189: 132–147.) to allow for state-dependent discontinuity points. We discuss the estimation of the model, and propose test statistics for treatment effect and state dependency in the discontinuity points. We conduct Monte Carlo simulations to compare the proposed estimator with these based on the constant discontinuity RDD and the classic fuzzy RDD, and find that overlooking the state dependency can lead to biased estimates of treatment effects, while the proposed estimator works well and is robust when applied to constant discontinuity RDDs. Monte Carlo experiments also point out that the sizes and powers of the proposed test statistics are generally satisfactory. The model is illustrated with an empirical application.
Entscheidung für das, was ohnehin ist
Authors: Gruber Alex 
Published: October 2018

Zusammenfassung
Jacques Derrida beschäftigte sich zeitlebens mit den Fragenstellungen politischer Theologie, wie nicht nur anhand seiner späten Monographie zu Carl Schmitt ersichtlich wird. Auch in seinen stärker unmittelbar politischen Ausführungen spielen diese Überlegungen eine zentrale Rolle. Der Aufsatz stellt die Schmitt-Rezeption und -Kritik Jacques Derridas dar, und wie sich diese Auseinandersetzung im Gerechtigkeitsbegriff niederschlägt, der für das Spätwerk dieselbe Bedeutung erlangt wie die différance für die Frühphase. Die Grundthese dabei lautet, dass die explizite Hinwendung zu Carl Schmitt der theoretischen Konstruktion Derridas und ihren Widersprüchen geschuldet ist, wie sie zugleich jene mythischen Lösungsversuche zeitigte, von denen nicht zuletzt der Gerechtigkeitsbegriff Auskunft gibt.
Ohne Form kein Inhalt
Authors: Breuning Felix 
Published: October 2018

Zusammenfassung
Der Artikel argumentiert, dass Mouffe und Laclau in ihrer Neubestimmung des Marxismus als Diskurstheorie den Begriff des bürgerlichen Staates vernachlässigen und ihre politische Theorie daher problematische staatstheoretische Annahmen aufweist. Ausgehend von ihren Anknüpfungspunkten bei Eduard Bernstein kritisiert er ihre einseitige Deutung der Französischen Revolution, ihren mangelnden Begriff der politischen Form bürgerlicher Staaten sowie ihre Abkehr von der Gesellschaftstheorie. Diese theoretischen Entscheidungen begrenzen die konkreten Analysen von an sie anschließenden Theoretiker_innen auf abstrakte Reflektionen oder bloße Diskursanalysen. Bezüglich der politischen Strategie führt der postmarxistische Umgang mit dem Staatsbegriff in eine instrumentelle Staatsvorstellung zurück und erschwert eine Kritik des Nationalismus.
The Graetz Problem for the Ellis Fluid Model
Authors: Ali N. , Khan M.W.S. 
Published: October 2018

Abstract
The determination of temperature and auxiliary quantities such as local and average Nusselt numbers for thermally developing flow is referred as the Graetz problem. In the classical Graetz problem, the fluid entering the tube or channel is Newtonian in nature. Here, an extension of the classical Graetz problem is presented by assuming that the fluid entering the tube or channel obeys the Ellis constitutive equation. The energy equation for the considered problem is solved using the separation of variables technique supplemented with the MATLAB routine bvp4c for computation of the eigenvalues and numerical solution of the associated Sturm-Liouville boundary value problem. The problem is solved for two types of thermal boundary conditions, namely, uniform surface temperature and uniform surface heat flux for both flat and circular geometries. Expressions for bulk mean temperature and local and average Nusselt numbers are presented and discussed through tables and graphs.
On the composition of the Achaian synodos in Polybios’ time*
Authors: Sizov Sergey 
Published: October 2018

The question of who attended the regular assemblies (synodoi) of the Achaian koinon in the 2nd century BCE is still a subject of discussion. Two main theories prevail: the synodos either was a primary assembly of all citizens or a meeting of the federal council. However, the very existence of an elected council in the koinon can be doubted, since no trace of activity of this federal body in the 3rd and the 2nd centuries BCE can be found, either in literary, or epigraphic sources. The only evidence supposedly proving the existence of an Achaian council is the frequent mention of the word boule in Polybios’ accounts of the federal assembly meetings. Attentive consideration of these passages leads to the conclusion that, in the lexicon of the Achaian historian, boule is not the official name of a state institution and does not necessarily mean “a council.”
Of the two theories, seeing the synodos as a meeting of the primary assembly seems to be the most compatible with the evidence. However, in light of the recently found inscription SEG LVIII 370, we may be certain that in Polybios’ time the synodos was a representative body – and therefore not a people’s assembly in the strict sense of the word. The only reasonable interpretation of this contradictory evidence appears to be the following: the synodos was a meeting of several thousand delegates representing all the Achaian poleis, the size of each delegation being determined in proportion to the population of the community. The list of these delegates varied from meeting to meeting, and therefore the synodos should not be regarded as a body with permanent membership, such as a state council. This kind of assembly also might have served as a model for the archairesiake ekklesia of the Lykians.
Przyczynowanie osobowe i jego neoplatoński kontekst. Filozofia Boga Xaviera Zubiriego
Authors: Niziński Rafał 
Published: October 2018

Zubiri odrzuca Arystotelesa koncepcję przyczynowości i stwarza własną, opartą na chrześcijańskim neoplatonizmie. Przyczynowanie to jedna z funkcyjności. Polega ona na oddziaływaniu jednej rzeczywistości na drugą. W ten kontekst Zubiri wpisuje te ludzkie akty, które są związane z życiem osobowym, i uznaje te akty za prawdziwe przyczyny w sensie metafizycznym.
Mesjańska maszyna – szkic teorii mesjanizmu
Authors: Kołoczek Łukasz 
Published: October 2018

Artykuł jest próbą stworzenia zarysu teorii mesjanizmu, która obejmowałaby zarówno rozmaite wersje żydowskich mesjanizmów, chrześcijańskich i islamskich, jak i świeckich. Proponuję pomyśleć mesjanizm jako transcendentalne pole genezy, a więc jako maszynę w rozumieniu zaproponowanym przez Deleuze’a. Taka teoria ujawnia słabe punkty polskiej współczesnej myśli mesjańskiej, której reprezentantem jest Paweł Rojek.
Nutritive status changes, studied in hiv-positive patients with pneumonias, caused by Streptococcus pneumoniae
Authors: Nikolenko V. V. , Nikolenko A. V. , Minikeeva M. R. 
Published: October 2018

Aim. To study the changes in nutritive status of HIV-positive patients, hospitalized with community-acquired pneumonias, caused by Streptococcus pneumoniae.
Materials and methods. During 2014–2017, clinicolaboratory examination of 676 HIV-positive patients was carried out on the basis of Perm Regional Clinical Infectious Hospital. There were formed the groups of “observation”, including patients with pneumonias, caused by Streptococcus pneumoniae with lethal outcomes, and groups of “comparison”, including patients, discharged from hospital in satisfactory status.
Results. Negative dynamics of nutritive status, caused by progression of the main disease and addition of bacterial agent was revealed. The moderately severe and severe changes were registered in patients with lethal outcomes already at the moment of hospitalization.
Conclusions. Direct correlation between the protein-energy insufficiency and the number of life-threatening complications was determined.
Problem of insufficient involvement of population into pharmacovigilance system
Authors: Krasheninnikov A. E. , Romanov B. K. , Safiullin R. S. 
Published: October 2018

Aim. To ground the necessity of taking into account the double-component nature of the phenomenon of poor activity of the population in the system of pharmacovigilance so as to work out the measures, aimed at development of UR reporting. The process of formation of a modern system of pharmacovigilance in Russia with appropriate level of reporting on the cases of unfavorable response (UR) to application of drugs is difficult because of the absence of involvement of the population into the system of spontaneous messages.
Materials and methods. The methods of content-analysis of messages and surveys were used; the measures, promoting development of the level of reporting on unfavorable responses to drugs were worked out. The object of the analysis included randomized sampling of 100 tests of messages for the period of 2009–2017, the selection criterion of which was the category “side effects of drugs”. The survey was conducted in direct form among the inhabitants of Kazan in 2018.
Results. Pharmacovigilance of the population in Russia is insufficiently developed and concentrated mainly in metropolitan region (Moscow, Moscow region) and neighboring regions (Republic of Tatarstan, St. Petersburg). Pharmacovigilant culture of the population in Russia has an insufficient level of development and is expressed by lack of correct notions of pharmacovigilance system in this country (responsible state institutions, reporting channels) among the citizens that, probably, makes their participation in active reporting difficult.
Conclusions. When influencing both factors, we can form the basis for working out the measures of efficient development of the proper level of UR reporting among the population of the Russian Federation.
Analisis Kemampuan Penalaran Matematis Peserta Didik dalam Menyelesaikan Soal Cerita di SMAN 6 Malang
Authors: Linola Delima Mei , Marsitin Retno , Wulandari Tri Candra 
Published: October 2018

Penelitian ini merupakan penelitian kualitatif dengan jenis penelitian deskriptif kualitatif yang bertujuan untuk mendeskripsikan kemampuan penalaran matematis peserta didik dalam menyelesaikan soal cerita di SMAN 6 Malang. Subjek dalam penelitian ini adalah peserta didik kelas XI MIPA 4. Indikator yang digunakan untuk menganalisis kemampuan penalaran peserta didik antara lain (1	) melakukan manipulasi matematika, (2) menyusun bukti dan memberikan alasan terhadap kebenara solusi, (3) menyajikan pernyataan matematika secara tertulis, diagram, dan gambar, dan (4) menarik kesimpulan pernyataan secara logis. Teknik pengumpulan data terdiri dari tes tertulis dan wawancara. Analisis data yang digunakan dalam penelitian ini meliputi reduksi data, penyajian data, dan penarikan kesimpulan. Berdasarkan analisis data diperoleh hasil bahwa kemampuan penalaran matematis peserta didik kelas XI MIPA 4 SMAN 6 Malang dalam menyelesaikan soal cerita tergolong tinggi. Peserta didik dengan kemampuan penalaran kategori rendah sebanyak 4%, peserta didik dengan kemampuan penalaran kategori sedang sebanyak 32%, dan peserta didik dengan kemampuan penalaran kategori tinggi sebanyak 64%
Hydraulic Fracture Height Growth: Pseudo-3D vs. Full 3D Modeling
Authors: de Pater C. J. , Shaoul J. R. , Northington N.. , Stelin I.. 
Published: October 2018

Abstract
Advances in fracture mapping and full 3D modeling have yielded new insights into hydraulic fracture geometry, but it is still impossible to predict height growth. Fracture mapping data collected from a large number of treatments in different basins yield a rule-of-thumb for expected fracture height over fracture length (aspect ratio), but in specific cases fracture design optimization requires a more accurate forecast for height growth. Calibrated models with full 3D fracture geometry will give the best results, but in many projects the available data to calibrate such a model is severely limited. Knowing this, the question this paper attempts to answer is: "Will using a full 3D model give more reliable predictions of fracture geometry (maybe height growth) compared with pseudo-3D models?".
Using data from an instrumented field test and routine fracture treatments, the results of the different fracture models are tested. Even when detailed knowledge of stress and geomechanical properties are available, it is impossible to match observed fracture geometry using only conventional hydraulic fracture physics. So, even a full 3D model does not provide a true prediction of fracture geometry. Both pseudo3D and full 3D fracture models can match observed fracture geometry, but only by introducing additional parameters beyond conventional fracture propagation physics, such as formation lamination or fracture tip pore pressure.
A full 3D model with default input parameters and conventional fracture physics yields a prediction of strong containment, even for modest stress difference between pay and overburden. This agrees in general with average observed geometry, but in specific cases, fracture height growth still occurs, showing that in these cases the model was inadequate and needs to be calibrated. Pseudo-3D models tend to overestimate height growth for default inputs, but that can also be modified to match the stronger containment often seen in practice. Therefore, no benefit is obtained from fully gridded simulation models in routine cases where critical inputs and calibration data are unavailable.
Achieving Desired Fracture Placement in a Thick and Stratified Reservoir
Authors: Jaboob M.. , Turk G.A.. A. , Rylance M.. , Trejo R.. , Al-Shueili A.. , Al Manji A.. , Ishteiwy O.A.. A. 
Published: October 2018

AbstractThe Barik formation is a low-permeability conventional tight-gas reservoir, in Block 61 in the Sultanate of Oman, comprised of a series of interbedded sandstone and mudstone (shale) layers. To achieve the most efficient and economic development of this formation sequence, the wells require the application of massive hydraulic fracturing. Such an approach was developed and deployed during the Appraisal stage of the programme and a considerable effort was placed in ensuring that the fracture height was contiguous, resulting in an effective drainage across all layers of the Barik formation. This approach was then encapsulated in the Full Field Development (FFD) planning Basis of Design (BoD) and was established as the approach to be taken throughout FFD.Until the field development was well underway, a single fracture treatment had proven sufficient to stimulate the entire Barik reservoir. However, as the development moved into the Southern area of the field, a substantial thickening of the Barik sequence was encountered and with this change successful complete vertical propped fracture coverage became much more challenging to achieve in an effective and repeatable manner. This paper demonstrates the approaches that were subsequently taken with the fracture design, the fracturing fluid selection and the fracture perforation strategy to address this issue and restore the achievement of complete fracture/formation coverage.Throughout the paper a number of examples will be presented that demonstrate the issues and effects that arose with the thickening of the Barik formation. The paper will then go on to examine how these effects were identified, what surveillance was used and the various characteristics that were displayed and how they were inferred. It will examine how the various issues were addressed, what changes were made to the fracturing strategy and demonstrate, through direct results, the outcomes that were subsequently achieved.This paper will focus on some of the principal issues that can arise when moving a developing fracture BoD in a laminated sequence into a more thickly developed environment with more extensive height and bulkier sands. The paper will provide a number of detailed examples of the issues themselves, and describe the detrimental and impactful effects that they may have on fracture coverage and hence well productivity and EUR. Additionally, the paper will describe the approaches that can be used in order to successfully address these effects. The paper will clearly demonstrate that when such considerations are taken into account that a successful suite of outcomes can be achieved.
Is Bigger Always Better? Using Chemical Tracers to Optimize the Size of your Multistage Fracturing
Authors: Spady D.. , Langdon I.. , Tippett W.. , Hogg M.. , Lane D.. 
Published: October 2018

AbstractFrom using history matching to recording microseismic; exploration, completion, and production groups in the oil and gas industry don't know exactly where stimulation treatments are placed and how efficient that placement has been. Exploration geologists and geophysicists want to know placement effectiveness to relate current geologic parameters with future potential formations. Completion engineers want to use tubular and downhole hardware systems to be as cost-effective as possible and to minimize total stimulation treatment cost. Production engineers are seeking to maximize production for as long a time frame as possible. Fracturing placement and verification cuts across all segments of an asset.With recent technology and methodology advancements, the industry can inject particulate oilsoluble tracers (OST) with the proppant and measure those tracers effectively from fracture tip to production tank. While still not accurately describing the exact fracture geometry or parameters such as fracture conductivity (fcd), the industry can now qualitatively measure production from each stage. With each stage uniquely identified by post-fracture production, fracture size and capital expenditure associated with the placement of the fracturing treatment can be optimized.Broadview Energy recently pumped a fracturing treatment into the 637 m (2089 ft) total vertical depth (TVD) Sparky clastic zone through a 114 mm (4.5") liner string in a horizontal wellbore using mechanically operated sleeves. Broadview Energy sequentially alternated the size of the fracturing treatments along the length of the well between 7.5 t (16, 534 lb) and 5 t (11,023 lb) of 16-30 fracturing sand as the proppant. Alternating the fracture size served to isolate geologic and fluid heterogeneities.Measuring the OST concentration from each fracture treatment showed results that were not directly proportional with the size of the treatment; namely, a 50% larger stage treatment yielded a 33% improvement in OST return. Using tracer technology to show observable variations of completion methods, Broadview Energy hypothesizes that, with further testing, it would be possible to recognize the threshold in fracture size and prevent diminishing returns in future fracture treatments with similar geologic conditions.
Early Insights from Various Load Fluid Recoveries after Hydraulic Fracturing Treatments: A Case History of a Developing Unconventional Oil Shale Play in Alberta
Authors: Wüst Raphael A. , Mattucci Mike , Hawkes Robert , Quintero Harvey , Sessarego Sebastian 
Published: October 2018

Abstract
The Devonian Duvernay Formation in Alberta, characterized as a carbonate-siliceous source rock, is ramping up to be one of the largest and most prolific shale oil plays in Canada. In the southern part of the Duvernay Shale Basin (i.e. East Shale Basin), tight limestone beds are interbedded with laminated organic-rich calcareous shales, which show an organic maturity ranging mostly from early oil- to condensate-window. This new light oil shale play is still in the initial stages of development and the nature of these deposits requires hydraulic fracturing to increase stimulated rock volume. General completion programs involve ≥50 clustered plug ‘n’ perf stages with slickwater treatments in excess of 40,000 m3 with ~4000 tonnes of proppant per well. The large water volume treatments will inevitably interact directly with the rock surface in the stimulated area and cause both oil-water and rock-water interactions. Post-hydraulic fracturing water retention is especially pronounced in light oil shale plays. The oil-wet nature of the Duvernay, along with calcareous and siliceous shale lithologies, adds to the complexity of water retention and perceived water-blockage. In addition, because of operational delays such as road bans and pipeline constraints, some wells may be shut-in after the fracturing treatment for weeks and even months, which will affect rock-oil-water behavior (i.e. production). The extent of water displacing into the matrix of the rocks of the Duvernay Formation in the East Shale Basin, as measured by load fluid recovery, varies significantly and appears to heavily rely on the choice of surfactant. Although the use of surfactants is generally accepted for this play, detailed understanding of the rock-fluid interaction mechanisms is still incomplete.
This paper investigated the response of Duvernay Shale rocks from the East Shale Basin to various types of surfactants and analyzed production and fluid flowback data. Amott Cell analyses, which test for spontaneous oil displacement using various stimulation fluid types, demonstrated that in the East Shale Basin, nano-sized surfactants including multi-functional surfactants (MFS) and microemulsions significantly outperformed common surfactant chemistry when tested with mixed wettability shale core samples. The results provide an estimate as to extent of water migration into the matrix of the Duvernay as a result of the choice of surfactant. Our analysis is made possible from publicly available cores, laboratory analysis and high quality well production data from the Alberta Energy Regulator.