bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optimization of SAGD in Conductive Fractured Reservoir
Authors: Fattahi A.. , Zare A. R. , Akhondzadeh H.. , Derahman M. N. , Yunan M. H. 
Published: February 2012

AbstractSteam Assisted Gravity Drainage is a successful process that has been applied to extract heavy oil and bitumen mostly in Canada. Conductive fractures as reservoir heterogeneity are spaced a few meters from each other and differ from network fractures. There are a few studies investigating the impact of such fractures on SAGD performance. This work is a numerical study examining the relative location and configuration of wells to conductive fractures as an attempt to optimize SAGD process in three types of conductive fractures including horizontal, vertical and oriented fractures.While vertical fractures located above the well pair enhance the oil recovery rate at early time, those located far from the well pair do not affect the process performance. Consequently, to optimize the process, the wells should be applied beneath the vertical fracture. For the vertical conductive fractures locating at bottom of the reservoir, higher well spacing results in more desirable performance if the wells are drilled at the place of the fracture. Sensitivity analysis of injector-producer well spacing illustrated that for horizontal fractures locating around 5 m from the reservoir base, the injector should be drilled above the fracture to enhance the process performance much more than the case of having the injection well below the fracture. Also it is showed that the well pair should be located in a manner that oriented fractures with positive slope place at right hand side and near the wells. Moreover, Off-setting the wells in the fracture direction resulted in enhanced behavior of the process. In low permeability tar sands, hydraulic fracturing can mimic vertical conductive fractures which improve steam chamber expansion, hence resulting in better performance. This study suggests some screening criteria for the well placement design to enhance the oil recovery in conductive fractured reservoirs.
Fast and Efficient Assisted History Matching for Large-Scale Applications
Authors: Friedel Torsten , Taware Satyajit 
Published: February 2012

Abstract
History matching is a key task for field reviews. Over the past decades, assisted history matching techniques have effectively automated parts of the process. Methods commonly applied include genetic algorithms, adjoint methods, ensemble Kalman filters, streamline-based inversion, and conventional Newton-type methods. All these methods, however, are numerically expensive, often to a prohibitive degree for large and complex reservoirs.
A novel method aims to overcome this limitation. It combines the advantages of two well-established technologies: a numerically efficient Newton-type optimization scheme and full-physics proxy-type modeling using grid coarsening. It focuses on unknowns that can be readily re-parameterized, such as relative permeability and capillary pressure functions, fluid and rock properties, or fluid contacts. In addition, the statistical analysis of the parameter identification allows the establishment of confidence intervals, parameter correlations, and sensitivities.
Newton-type optimization methods can numerically be less expensive and potentially show superior convergence behavior under certain conditions. Although they are prone to converge to local minima and are less suitable for adjusting permeability or porosity distributions, they can be advantageous for smaller parameter spaces when using a re-parameterization approach. At the same time, grid coarsening allows drastically reduced runtimes while maintaining realistic geological and physical assumptions. Using the Newton-type calibration technique, the workflow suggested comprises initial screening, ranking of parameter sensitivities, and subsequent detailed parameter calibration to obtain the optimal parameter set.
A large reservoir dataset in which simulation runtimes would not allow for traditional assisted history matching approaches shows the advantages of the novel method. Convergence is rapid and minimal time is required to optimize sets of relative permeabilities, including endpoints and curvature of each individual function. As illustrated, the re-parameterization also allows imposition of a physically sensible solution. Most importantly, the statistical analysis of the results identifies key sensitivities in the reservoir, ultimately contributing to a better understanding of data gaps and uncertainties.
Occurrence, Character and Origin Of Natural Gases In The Deepwater Nile Delta, Egypt
Authors: Nassar Marawan , Nijenhuis Ivar , Fattah Tharwat Abdel , Ramadan Alaa Eldin 
Published: February 2012

AbstractThe offshore Nile Delta is an established and significant gas and condensate province in North Africa. It is considered to have significant remaining hydrocarbon potential for future exploration. The main petroleum system comprises of an Oligocene Type II/III mixed oil and gas prone source rock which charges the overlying thick sequence of Neogene-Quaternary clastics. While the hydrocarbon potential of the Nile Delta and its geological and stratigraphic pattern has been the focus of numerous studies, the origin of the gas and associated fluids has been poorly documented.In order to characterize the natural gas at the study area, an integrated geological, geophysical and geochemical study was performed on 439 gas samples and 493 cutting samples collected from 7 wells in addition to a review of published work covering the origin of natural gas and associated fluids.The analysis shows that the gases are dominated by methane (97%-100%) and the light carbon isotopic composition (δ13C1) values (−57.4‰ to −80‰) suggest that these gases are derived from the decomposition of immature (0.3-0.6 Ro%) sedimentary organic matter by Methanogens activity under relatively low temperatures (&lt;80°C).The paper will give an overview of the integrated work, focusing on the geochemical analysis used to describe the occurrence and character of the natural gases in the study area.
Figured World of Eating Disorders: Occupations of Illness
Authors: Elliot Michelle L. 
Published: February 2012

Background. The biomedical diagnosis of eating disorders signifies a mental illness with complex physical symptomology. The socio-cultural determinants and impact of eating disorders on daily occupations are not adequately addressed in this classification. Purpose. This paper introduces the concept of a figured world as a framework for how eating disorders exist in daily activity and social discourse. How occupations become ascribed with meaning generated by an eating disorder will be proposed through the voice of a composite character in the figured world. Key Issues. Central elements to contextualizing figured worlds include positional identity, self-authoring, and semiotic mediation. The generation of meaning in illness arises from the integration of these elements into this specific figured world. Implications. The competing agendas of the biomedical model and figured world permit a new understanding of the challenges associated with recovery. For occupational therapists, these challenges require the reattribution of meaning of daily occupations.
La participation des aînés à des activités de bénévolat: Une revue systématique
Authors: Godbout Elisabeth , Filiatrault Johanne , Plante Michelle 
Published: February 2012

Contexte. Le bénévolat peut représenter une forme de participation sociale à la fois très significative pour les aînés et bénéfique pour leur santé, tant sur les plans physique que psychologique. C'est pourquoi les ergothérapeutes et les autres professionnels de la santé, de même que les intervenants du milieu communautaire soucieux de favoriser le vieillissement en santé, font de plus en plus appel à des aînés bénévoles pour collaborer aux initiatives de promotion de la santé et de soutien à la communauté. Toutefois, ils font souvent face aux défis que posent le recrutement de bénévoles et le maintien de l'engagement bénévole. Objectif. Une revue systématique des écrits a été réalisée afin d'éclairer les pratiques dans ce domaine. L'objectif était d'identifier les facteurs influençant la participation des aînés à des activités de bénévolat. Méthodologie. Six bases de données bibliographiques ont été interrogées à l'aide de mots clés. Résultats. Au total, 27 articles ont été retenus pour l'analyse et ont permis de dégager une série de facteurs susceptibles d'influencer la participation bénévole, soit des facteurs liés à la personne, à l'environnement et à l'occupation. Conséquences. Des pistes concrètes pour faciliter le recrutement des aînés et le maintien de leur participation à des activités de bénévolat découlent de la présente analyse.
Partnering for Change: An Innovative School-Based Occupational Therapy Service Delivery Model for Children with Developmental Coordination Disorder
Authors: Missiuna Cheryl A. , Pollock Nancy A. , Levac Danielle E. , Campbell Wenonah N. , Whalen Sandra D. Sahagian , Bennett Sheila M. , Hecimovich Catherine A. , Gaines B. Robin , Cairney John , Russell Dianne J. 
Published: February 2012

Background. Developmental coordination disorder (DCD) is a common, chronic health condition that is poorly recognized and understood in school settings. Without appropriate support, children with DCD are at increased risk of depression, decreased fitness, and obesity. Evidence shows that occupational therapy intervention needs to shift from remediation of impairment to chronic disease management. Purpose. This paper describes Partnering for Change (P4C), an innovative, empirically derived school health service delivery model for children with DCD. Key Issues. The model emphasizes the partnership of the occupational therapist with educators and parents to change the life and daily environment of a child. The P4C partnership focuses on capacity building through collaboration and coaching in context. The model uses a tiered approach which includes whole class instruction, dynamic performance analysis, and monitoring response to intervention. Implications. P4C is a model that responds to the needs of this population, addresses issues identified in research, and provides a continuum of services designed to build capacity.
Sensory Processing and ADHD in children with Fetal Alcohol Spectrum Disorder
Authors: Abele-Webster Lynne A. , Magill-Evans Joyce E. , Pei Jacqueline R. 
Published: February 2012

Background. Sensory processing problems are prevalent in children who have fetal alcohol spectrum disorder. It is unclear to what degree these problems are distinct from attention deficits as measured during the diagnostic process in these children. Purpose. To understand sensory processing in these children, which may assist with early identification and intervention. Method. The relationship between attention and sensory processing was studied in a retrospective sample of 26 Canadian children diagnosed with fetal alcohol spectrum disorder. Findings. A very low correlation (r = .02) between Short Sensory Profile scores and the attention deficit hyperactivity index of the Conners' Parent Rating Scales was found for the five- to ten-year-old children. Sensory processing problems were found in 81% of the children, similar to other studies of children with fetal alcohol spectrum disorder. Implications. These findings can guide modifications of the environments, tasks, and approaches to children with fetal alcohol spectrum disorder.
Three-dimensional registration of tomography data for quantification in biomaterials science
Authors: Müller Bert , Deyhle Hans , Lang Sabrina , Schulz Georg , Bormann Therese , Fierz Fabienne C. , Hieber Simone E. 
Published: February 2012

AbstractThe paper shows the benefit of registration tools in the quantitative analysis of tomography data. For this purpose three-dimensional datasets, i.e. target design in rapid prototyping, hard X-ray tomography, and magnetic resonance tomography, were registered with rigid, affine and non-rigid algorithms. Using rigid registration, we aligned individual tomograms to obtain one three-dimensional dataset per specimen, compared human teeth to determine abrasion, and optimized the acquisition parameters in clinical computed tomography. Affine registration was used to determine the sintering-induced shrinkage of hydroxyapatite scaffolds. Using non-rigid registration, we gained insight into tumor morphology imaged by different modes of micro computed tomography. In addition, the fixation-induced shrinkage of tumor tissue and the local deformation of brain tissues as well as the shape changes in nickel titanium alloys were quantitatively determined. Three-dimensional registration is, therefore, a powerful means to count back any influence on morphology of tissues and to quantitatively compare data of different tomography modalities.
Fatigue induced deformation of taper connections in dental titanium implants
Authors: Zabler Simon , Rack Tatjana , Rack Alexander , Nelson Katja 
Published: February 2012

AbstractThe present study deals with in-situ microgap measurements in the internal taper connections of dental implants. Using X-ray phase contrast microtomography, the connecting interface between implant and abutment is probed non-destructively in three dimensions. Interference fringes across the conical interface occur due to the presence of microgaps, their intensity being a measure of the gap's width. Thus, for each point on the interface, interferences are extracted from the volumetric image in terms of normal projection maps which are, at selected points, compared to forward simulations to quantify the local gap width. Four designs of dental implants are tested in the “as-received” state as well as after application of cyclic extra-axial load. Results show different degrees of microgap opening by cyclic deformation according to the implants' design as well as a great amount of detail on the actual interface, i. e. fretting scars, grooves and wear debris.
3D image analysis and stochastic modelling of open foams
Authors: Liebscher André , Redenbach Claudia 
Published: February 2012

AbstractWe present methods for the geometric characterisation and stochastic modelling of open foams based on tomographic 3D image data. In the first step, geometric characteristics of the foam microstructure are estimated from the image. Using these characteristics, a random tessellation model is fitted to the cell system of the foam. The edges of this tessellation then serve as a skeleton for the foam's strut system. The focus of the paper is on the correct simulation of the foam's locally varying strut thickness in the model. For this purpose, the local strut thickness and the strut profiles are estimated from the image and reproduced in the model using locally adaptable morphology.
Estimation of the probability of finite percolation in porous microstructures from tomographic images
Authors: Ohser Joachim , Ferrero Claudio , Wirjadi Oliver , Kuznetsova Alina , Düll Jochen , Rack Alexander 
Published: February 2012

AbstractPercolation is an important property of porous media, as it describes the connectivity of pores. We propose a novel, direction-dependent percolation probability which can be efficiently estimated from three-dimensional images obtained by microtomography. Furthermore, in order to describe the penetrability of the pore space by particles of a given diameter or a fluid of a given surface tension, we introduce a percolation probability depending on the width of the pores, from which we may also derive a measure of the mean pore channel width. As application examples, we consider the penetrability of porous beryllium pebbles, the connectivity of pores in arctic firn, the percolation of the pore space of aluminum foams and the mean width of the percolating space between the fibers in a laminate's percolating pore space.
Morpho-topological volume analysis of porous materials for nuclear applications
Authors: Pieritz Romeu , Spino José , Vladimirov Pavel , Ferrero Claudio 
Published: February 2012

AbstractThe filtered medial line operator is a methodological tool for the morphological and topological analysis of reconstructed samples exhibiting either a porosity network or a granular structure such as bead packs. An application example of this methodology is the evaluation of the pore structure and the derived topological parameters of nanocrystalline 4Y-ZrO2 specimens simulating the high burn-up structure of UO2 fuel. The data indicate the absence of percolation paths at the experimental resolution, which is a beneficial property in terms of retaining fission gasses during the in-pile operation of the fuel. Furthermore, the analysis revealed a tendency for pore coalescence, which could explain the departure from the ideal behaviour of some physical properties typical of material matrices with a population of merely spherical pores. The same analytical tool is also used to characterise the porosity network created by gas bubbles in neutron irradiated beryllium samples, a material meant to be used for the blanket of the forthcoming generation of Tokamak fusion reactors. In particular, the preliminary results of the quantitative analysis performed on the porosity of the beryllium matrix as well as the initial investigation of its percolation properties are reported.
In-situ X-ray microtomography study of the movement of a granular material within a die
Authors: McDonald Samuel A. , Harris David , Withers Philip J. 
Published: February 2012

AbstractOptimising the manufacture of powder-processed components requires an understanding of the 3-D movement and behaviour of granular materials during processing. X-ray microtomography has been employed to study the 3-D flow behaviour of a metallic powder in-situ within a die as a function of the displacement of a punch into the die. In particular, the powder transfer behaviour for various open and closed die/punch geometries has been compared, including situations where features exist within the die and on the punch, cases where the die is both open and closed at the top, and finally where the punch itself contains a groove in the centre providing a gap into which powder can flow. Digital image correlation (DIC) has enabled the determination of local vector displacements of powder around the features within the die cavity as a function of punch movement and powder constraint to reveal bulk granular movement and densification. Zones of relatively stagnant flow are observed above a fixed insert within the die cavity, at the opening of a gap within a punch, and as a result of a closed die configuration, the latter showing transitions between the stagnant zones and much more mobile regions and the resulting powder compaction/dilation. As well as providing a means of developing practical die fill and compaction strategies that homogenise densification and thus improve product quality, the technique can also provide unique 3-D flow trajectories for model development.
Le sourire du Chat de Chester
Authors: Mary Arthur 
Published: February 2012

Résumé Que serait le récit fictionnel d’une rencontre clinique ? Nous partirons du double constat que nous imposons des transformations lorsque nous parlons d’un patient (pratiques d’anonymisation) ; et que nous ne saurions qu’être subjectifs dans la production du récit d’une rencontre. Est-il possible alors d’inventer de toute pièce un sujet autre que soi sans pour autant tomber dans une construction seulement imaginaire ? Ces réflexions pourraient renouveler notre façon de parler de patients que l’on n’invente pas.
Une lettre d'Antonin Artaud à Raymond Queneau *
Authors: Malausséna Serge 
Published: February 2012

Résumé	Lorsque le 1 er février 1945 Antonin Artaud écrit cette lettre à Raymond Queneau, lettre restée à ce jour inédite, il est interné à l’hôpital psychiatrique de Rodez depuis février 1943. Le Dr Ferdière le libérera en mai 1946. Son enfermement dans les asiles aura duré 9 ans…
A Gentleman with an Unusual Cause of Hypoalbuminemia
Authors: Law Siu-Tong , Chuen Chiu, Sin 
Published: February 2012

Protein-losing enteropathy (PLE) is a rare syndrome of gastrointestinal protein loss that may complicate a variety of diseases. The primary causes can be divided into erosive gastrointestinal disorders, nonerosive gastrointestinal disorders, and disorders involving increased central venous pressure or mesenteric lymphatic obstruction. Herein, we report on a 65-year-old man with PLE caused by invasive gastrointestinal stromal tumor (GIST). To our best knowledge, this is the first reported association between GIST and PLE. A brief review of the literature on the incidence, pathogenesis and management of GIST is also presented.
Bevacizumab vs. Ranibizumab in Preserving or Improving Vision in Patients with Wet, Age-Related Macular Degeneration: A cost-effectiveness Review
Authors: Nwanze Chukwuemeka C. , Akinwale Abumere , Adelman Ron A. 
Published: February 2012

Objective To evaluate the cost-effectiveness of monthly and as-needed dosing protocols using ranibizumab or bevacizumab for the treatment of neovascular age-related macular degeneration (AMD), when the treatment costs of severe ocular and systemic adverse events are considered. Methods A Markov model was developed to assess the cost effectiveness of each of the following protocols: monthly ranibizumab, monthly bevacizumab, as-needed ranibizumab and as-needed bevacizumab. Direct costs and utilities were assessed from the perspective of a third-party payer or an insurance company. Cost effectiveness was evaluated in 2011 US dollars per quality-adjusted life year (QALY). Results Considering the treatment costs of severe medical and ocular adverse events, the cost effectiveness of each protocol is as follows: monthly ranibizumab $63,333/QALY, ranibizumab as needed $18,571/QALY, bevacizumab monthly $2,676/QALY and bevacizumab as needed $3,333/QALY Sensitivity analysis of the treatment costs of medical and ocular adverse events demonstrated minimal impact on relative cost-effectiveness. Conclusion At current prices, monthly bevacizumab is the most cost-effective anti-VEGF AMD treatment protocol. Ranibizumab is as cost effective as bevacizumab at a maximum price of $158 per dose.
Decreasing Nicotine Content Reduces Subjective and Physiological Effects of Smoking
Authors: Penetar David M. , Lindsey Kimberly P. , Peters Erica N. , Juliano Trisha M. , Lukas Scott E. 
Published: February 2012

Objective Assessment of the subjective and physiological effects of smoking cigarettes with different machine-smoked nicotine yields. Methods Eight volunteers rated the characteristics of cigarettes with varying levels of nicotine (Quest®). At 30 minute intervals, participants smoked one of three different Quest® brand cigarettes in a counterbalanced order (reported machine-smoked nicotine yield: 0.6 mg, 0.3 mg, or 0.05 mg). Smoking satisfaction and sensations were measured on a cigarette evaluation questionnaire. A mood questionnaire measured self-reported subjective changes in ‘happy’, ‘stimulated’, ‘anxious’, ‘desire to smoke’, and ‘desire not to smoke’. Heart rate and skin temperature were recorded continuously. Results As nicotine yield decreased, cigarettes produced smaller changes in subjective ratings on the evaluation questionnaire with the placebo nicotine cigarette always rated lower or less potent than the other two cigarettes evaluated. Heart rate was significantly increased by the reduced nicotine cigarettes, but was not affected by the nicotine-free cigarette. Conclusion These results indicate that machine-smoked yield is an important determinant of both the subjective and physiological effects of smoking. The use of reduced and nicotine free cigarettes in smoking cessation programs remains to be evaluated.