bluuebunny/crossref_metadata_2025_split huggingface dataset:
Vitamin D Status has no Influence on the Incidence of Recurrent Urinary Tract Infections after Kidney Transplantation
Authors: Filipov Jean Jeanov , Zlatkov Borelli Kirilov , Dimitrov Emil Paskalev , Svinarov Dobrin A. 
Published: April 2015

Abstract

Introduction. Recurrent urinary tract infections (rUTIs) after kidney transplantation (KT) are associated with significant decrease in graft survival. There is a growing body of evidence for the pleiotropic effects of vitamin D (VD), including immunomodulatory and antibacterial effect. The number of studies on VD’s pleiotropic effects in kidney transplant recipients (KTRs) however is low. The aim of our study was to assess the influence of VD on the incidence of recurrent UTIs after KT.
Methods. The KTRs were tested for 25-hydroxyvitamin D (25VD) between 1.05.2012 and 30.11.2012. Patients within 12 months of transplantation, performed parathyroidectomy, concomitant intake of calcineurin inhibittors and mTOR inhibitors, advanced liver disease and VD supplementation were excluded from the study. Recurrent UTIs were defined as more than 3 episodes of active UTI within the last 12 months of testing for 25VD. Statistical analysis was carried out with SPSS version 22.0 and included descriptive statistics, Mann-Whitney U test. Determination of total 25VD was performed by a validated LC-MS/MS method.

Results. A total of 275 patients met the above-mentioned criteria (males 182, females 93). The mean 25VD in patients with rUTIs (n=14) was 51.41±25.17 nmol/L, whereas in the group without rUTIs (n=261) the level was 60.35±23.29 nmol/L. After matching the two groups for seasonal factors (sampling for 25VD in July, August, September) and gender 169 patients were selected, and 11 were with rUTIs. No significant difference was detected in the 25VD level in the two groups (53.30±18.37 vs 49.08±21.04 nmol/L), p=0.342.

Conclusions. Despite the higher 25VD in the KTRs without rUTIs, the difference between the two groups remained insignificant.
Un événement sans témoin : vérité, témoignage et survie
Authors: Laub Dori 
Published: April 2015

L’Holocauste est un événement qui n’a eu aucun témoin. Les victimes restent dans le trou béant du silence, d’un secret partagé par eux seuls. La possibilité de trouver un « Tu » intérieur pour témoigner a été détruite. Ce besoin de dire, de transmettre, d’être entendu, rencontre son impossibilité. À travers cette lutte partagée avec un écoutant emphatique et averti, l’acte du témoignage sera celui de la repossession de ce vécu : revivre à travers cette traversée pour être témoin à soi-même et à sa nouvelle vie. Des récits de survivants donnent tout le poids à ce voyage du témoignage et à son arrêt.
Rétablir le « Tu » intérieur dans le témoignage du trauma
Authors: Laub Dori 
Published: April 2015

Au plus profond du cœur de l’expérience traumatique extrême (par exemple, un génocide ou des abus sexuels sur enfants) réside la destruction de la dyade internalisée et empathique de la communication. Comme le bourreau ne tient pas compte des supplications des victimes et procède impitoyablement à leur exécution, le « Tu » intérieur, l’adresse avec laquelle un dialogue intérieur peut prendre place – un élément indispensable à la symbolisation et à la constitution d’un monde intérieur – cesse d’exister. Sans ce dialogue interne, la représentation psychique de l’expérience traumatique ne peut exister et un récit pouvant se raconter à quelqu’un d’autre ne peut se constituer. En conséquence et dans une large mesure, le témoin « ne sait pas » ce qu’il sait de son expérience de l’extrême. C’est seulement à travers le processus du témoignage, en compagnie d’un écoutant intime, d’un écoutant totalement présent, que le « Tu » intérieur perdu peut commencer à être rétabli et qu’un processus de dialogue interne, de symbolisation et de formation d’un récit peut reprendre. Une mémoire est ainsi créée qui peut, à la fois, être reprise et oubliée. L’intervention du témoignage vidéo décrite ici a un effet thérapeutique, à la fois en créant la possibilité d’un passé remémoré, et aussi, en libérant un espace émotionnel disponible au présent. Le discours du trauma est parcouru d’essais infructueux de mise en narration du trauma, allant de trous de mémoire temporaires à des états de dissociation voire de mutisme total : on donnera des exemples de telles « crises du témoignage ».
Le stress prénatal et le développement humain : une réponse adaptative à un environnement adverse ou un effet tératogène au développement de l’enfant ?
Authors: Garon-Carrier Gabrielle 
Published: April 2015

Le stress est souvent considéré comme un facteur prédisposant à plusieurs pathologies physiques et mentales. Durant la période de la grossesse, il peut affecter le développement du fœtus de diverses manières, entre autres, par une transmission hormonale de la mère au fœtus, une réduction de la circulation sanguine reliée au placenta ou encore, une modification dans les habitudes de vie de la mère. De plus en plus d’études effectuées sur les humains tendent à montrer un effet délétère du stress prénatal sur le développement de l’axe hypothalamo-hypophyso-surrénal (HHS), et dont les conséquences associées à un dysfonctionnement de cet axe se manifestent dans plusieurs sphères développementales au long cours (sociale, cognitive, physique). Néanmoins, le stress est aussi associé à des effets bénéfiques chez l’individu et selon la conception évolutive, permettrait d’assurer la survie de l’espèce. En ce sens, est-ce que le stress prénatal n’a que des conséquences néfastes ? Selon l’hypothèse de la programmation fœtale, le stress prénatal est adaptatif et favorise la survie de l’individu si l’enfant se retrouve dans un environnement postnatal stressant et hostile. D’après le modèle diathèse-stress, le stress prénatal constitue une vulnérabilité dont les conséquences ne se manifestent qu’en présence d’un environnement postnatal adverse. Puis, selon l’hypothèse de la susceptibilité à l’influence environnementale, les effets du stress prénatal relève d’une différence individuelle dans la plasticité de l’individu.
Anxiété de séparation maternelle et le développement social de l’enfant
Authors: Pessoa e Costa Inês , Torres Nuno , Monteiro Ligia , Tereno Susana , Veríssimo Manuela 
Published: April 2015

Le principal objectif de cette étude est de déterminer quels sont les effets de l’anxiété de la séparation maternelle sur le développement social de l’enfant, notamment, sur ses compétences sociales. Les données ont été recueillies auprès de 312 mères dont leurs enfants étaient en école maternelle. Deux échelles ont été utilisées : l’échelle d’anxiété de séparation maternelle (MSAS - Hock, McBride et Gneza, 1989) et l’échelle de compétence sociale et d’évaluation du comportement (SCBE – La Freniere et Dumas, 1996). Les résultats montrent que des niveaux élevés d’anxiété maternelle de séparation entraînent des baisses des compétences sociales, surtout pour les garçons.
Reservoir Zonation - A Novel Approach: Use of Core Derived K-Ø-Swirr Relationship to Define Reservoir Rock Types (RRTs)
Authors: Choudhary A. , Thapliyal S. 
Published: April 2015

Abstract
Rock typing is an essential reservoir characterization tool to reflect the spatial variation in initial fluid distribution and flow behavior characteristics. Rock typing techniques are generally based on porosity-permeability relationships to establish the types of rocks present in the reservoir. These techniques lack in effective segregation of reservoir into definite number of zones/rock-types with clear boundaries. This results in a non-unique rock-typing scheme with arbitrary number of RRTs depending on data manipulation. Moreover, these RRTs do not correspond to separate J-function curves due to negligence to water saturation term. To overcome these problems, a new approach for reservoir zonation is developed which has been tested in a few off-shore sandstone reservoirs.
This paper illustrates a robust method of rock typing using a new theoretical development and mathematical formulation. The method integrates irreducible water saturation term with modified Carmen-Kozney equation using a proposed pore-throat dependent water saturation function [Swirr = exp (-art)]. The generalized porosity-permeability-saturation equation [K = AØ3(lnSwirr)B] thus derived is fitted on the Routine Core Analysis (RCAL) data for division of reservoir section into different layers having unique coefficient-exponent set (A, B) representing RRTs.
Application of this method resulted in an effective RRT scheme as evident from the unique coefficient-exponent sets as well as separate J-function curves. The unique porosity-permeability-saturation relationship existing for each RRT has been thus obtained from the RCAL data. This relationship can be used as an efficient tool for reservoir zonation. Reservoir zonation algorithm, analysis results and validation procedures are discussed using field examples.
Reservoir characterization is the key to improve reservoir performance prediction and recovery optimization. This paper presents a novel approach to effectively segregate the reservoir into definite number of RRTs using only RCAL data. This work also presents a theoretically derived K-Ø-Swirr relationship based on pore scale attributes. Irreducible water saturation, being an eminent parameter describing the internal architecture of the rock, is included in formulation and derivation of a theoretical framework to address classification of RRTs.
Settling of Wax Particles in Near-Gelling Systems Under Quiescent Conditions
Authors: Golchha Abhishek , Sarica Cem , Venkatesan Rama 
Published: April 2015

Abstract
During a shutdown of crude oil production from offshore fields, the trapped fluid inside the riser and flowlines starts cooling down, triggering the precipitation of the dissolved wax particles when the temperature drops below the Wax Appearance Temperature (WAT) of the mixture. This work aims to study the settling tendencies of precipitated wax under quiescent conditions when the final temperature of the crude oil is below its WAT but above or near its pour point.
An experimental test facility was designed and constructed to simulate subsea cooling of crude oils under quiescent conditions. A series of experiments were carried out with different model oils and wax concentrations to study gravity settling. Moreover, modifications were made to an existing hindered particle settling model and its application to wax settling scenarios was assessed by comparing the results obtained thereof with the results obtained experimentally.
The results obtained from the experimental runs show that gravity settling can be appreciable under certain operating conditions and fluid properties. It was observed that waxy model oils which have pour point (PP) temperatures above the surrounding ambient temperature tend to form gels as the fluid temperature decreases below the PP during the quiescent conditions. However, in cases where the pour point is close to or below the surrounding ambient temperature, precipitated wax particles may have a tendency to settle under gravity instead of gelling up. The results also portray the effect of wax concentration on the settling behavior. Understanding the behavior of precipitated wax particles in quiescent conditions under the influence of gravity in different systems of varying wax concentrations can help in identifying and remediating operational difficulties associated with wax precipitation during shutdown.
The effect of gravity on wax particles in vertical pipelines during shutdown has not previously been studied much and the settling phenomenon in such situations is not well-known. Due to the effects of changing temperature, particle shape and other factors, gravity settling of wax particles in such systems is different from other systems where a particle is settling in a fluid under gravity. This work provides some input on certain key aspects of this phenomenon.
An Experimental Study on Effects of Static CO2 on Cement under High-Pressure/High-Temperature Conditions
Authors: Aiex Cristina , Campos Gilson , Deshpande Abhimanyu , Chiney Abhinandan , Patil Sandip , Ravi Kris 
Published: April 2015

Downhole CO2 in the presence of water forms carbonic acid, which reacts with cement. Some of the final products are water soluble and are leached out. This could cause loss of long term mechanical integrity of the cement sheath, among other issues. Hence, long term prediction of cement sheath carbonation is important to help ensure the cement system designed for CO2 environments creates and maintains zonal isolation throughout the life of the well.
This paper discusses a series of long term tests performed to better understand the effects of CO2 on cement quantitatively. CO2 downhole generally falls within two categories dry CO2, which is a result of carbon capture and sequestration (CCS) activities, and wet CO2, which accounts for naturally formed CO2. Cement samples are tested under downhole conditions of high-pressure/high-temperature (HP/HT) in two different environments supercritical CO2 and carbonic acid, which represent the two different types of CO2 present in the wellbore, respectively. Different types of cement blends have been used in the study to understand the effects of cement composition on corrosion caused by CO2.
Cement samples were periodically withdrawn from the autoclaves to test for transient permeability, compressive strength, Brinell hardness, and chemical composition (X-ray diffraction [XRD], inductively coupled plasma [ICP] tests, pH indicator testing, and thermogravimetric analysis [TGA]). All of the samples were tested for a total of one year. It was observed that chemistry played a very important role in determining how resistant the cement is to attack from CO2.
This study helped provide clear insight into a method that can be used for testing different cement blends for long-term integrity under varying corrosive environments. Knowing the performance of particular cement chemistry under downhole conditions provided considerable benefit in terms of understanding long term integrity of the cement sheath.
Effective Launch and Recovery of Autonomous Underwater Vehicles
Authors: Jamieson J , Wilson L 
Published: April 2015

Abstract
The introduction of autonomous underwater vehicle (AUV) technology in the Oil and Gas arena has and continues to demonstrate significant advantages in offshore underwater operations. One key aspect the "launch and recovery", of AUV operations has the potential to limit the full advantages of the technology being realized.
The current mitigation relies heavily on vessel operations during the launch and recovery procedure. This limitation does not fit the original vision set out as a key AUV service, that is to reduce the reliance on a support vessel enabling cost savings and flexibility to deploy when required. This could ultimately limit the effectiveness that the Autonomous Underwater Vehicle technology can deliver.
This paper will discuss operational issues related to current launch and recovery methods; including weather limitations; surface, mid water and seabed launch & recovery methods; typical vessel operational constraints and the AUV system requirements.
Further to this, the method developed by Subsea 7 to launch and recover its hovering Autonomous Inspection Vehicle (AIV) to the seabed using a dedicated basket will be discussed. A change in approach, the system is designed to meet the needs of the vehicle and vessel operations. The system combines well understood and commonly used offshore package handling practices with the advanced autonomous technology to resolve the launch and recovery issues once and for all.
Subsea Processing versus Host Selection: An Imperative Correlation
Authors: Anikpo A. , Beltrami F. 
Published: April 2015

Abstract
Subsea processing (SP) technologies and host facilities are distinct building blocks in offshore oil and gas field development; they can be regarded as complements or alternates depending on the given scenario. This paper will present a unique insight into these scenarios including applicable interactions. It will highlight the key parameters in this rarely investigated correlation which influence concept selection and full field development (FFD). The paper will also shed some light on key FFD drivers such as reservoir size and (qualitative) economics.
This paper is based on thoroughly conducted secondary research covering 72 past, present, and potential-future related projects around the world. A multidisciplinary approach leveraging expertise in field development, topsides and subsea processing was developed to highlight the trends and possible future applications.
The study reveals a direct correlation between subsea processing systems and host selection which plays a vital role in concept feasibility studies and full field development. Numerous subsea processing parameters have been considered during this study and a few have shown significant effects on host selection - reservoir size, water depth, field typology, etc. The generated trends reveal interesting winners and losers for various technical configurations, including a slight technology limitation dependence on geographical region. Although it may be possible to predict future applications of subsea processing technology and optimize designs based on the host's interaction with the subsea processing system, the market uncertainties still remain high; nevertheless, recommended areas of focus are presented in this paper based on identified gaps. There are not many publications on this subject; therefore some of the observations presented in this paper are novel.
Implementing Constructability in Brownfield Projects: A Case Study
Authors: Salem Amir G. , Le Normand Olivier 
Published: April 2015

A number of new developments based on floating production and storage facilities have suffered set-backs or been shelved due to escalating Capital Expenditure (CAPEX), increased top-side weight and complexity, and increasingly demanding regulatory requirements. Subsea tie-backs, and brownfield upgrades of floating facilities present operators with investment alternatives in their deepwater acreages while new technologies and improved business models are developed to lower cost and improve efficiencies. In this context, constructability offers an effective tool to influence project cost and schedule. As such, efforts to implement constructability in offshore oil and gas projects will set the stage for well-defined Exploration and Production (E&P) strategies while restoring confidence in the profitability and ultimately the safety of these developments.
This paper presents a case study of implementing constructability program in the deep-water Gulf of Mexico (GOM) for a brownfield subsea tie-back development. Project constraints such as regulatory requirements, metering, field proximity, production capacity, weight limitation, bed space, shutdown, commissioning and start-up etc, are identified and investigated in details. Measures to minimize offshore work, and hot work are presented. Tools utilized in the design phase such as 3D laser scanning technologies in conjunction with CAD systems and field verifications are discussed. Contracting strategies and fabrication yard selection process are explored.
Constructability parameters for the offshore campaign for hull piping and SCR/umbilical pull-in are outlined with goals to minimize offshore heavy lift and transport, diving operations, winch capacities and deck strengthening requirements. Additionally, riser installation methods and hang-off hardware are explored. Simultaneous Operation (SIMOPS) matrix development philosophy for the offshore campaign is proposed with focus on safety and uninterrupted production. The case study selected herein is for a Semi-submersible currently in production. Emphasis is given to effective work packages and job card development for effective offshore operations. Management of Change (MOC) processes are discussed. The findings and conclusions of this work are extended to other offshore production facilities. A road map extrapolating the outcome of this study is presented with the goals of implementing constructability as an effective tool for brownfield production floater development subject to risks of cost and schedule overruns.
Exploring the Benefits of Wellhead Fatigue Monitoring
Authors: McNeill Scot , Agarwal Puneet , Kluk Dan , Bhalla Kenneth 
Published: April 2015

This paper examines the benefits achieved through fatigue monitoring of wellheads. As an introduction, conservatisms in analytical predictions of wellhead fatigue life are cited. In addition, considerations for increasing wellhead fatigue resistance are reviewed along with recent wellhead fatigue monitoring developments.
The architecture of both stand-alone, battery-powered monitoring systems and real-time monitoring systems are examined. The capabilities and limitations of each respective system are discussed and the overall value-added to drilling and production systems is summarized.
Wellhead monitoring systems have been deployed in several drilling and production operations with high fatigue demand, where loading from waves, rig motions or VIV is particularly intense. As a case study, results are examined from a wellhead monitoring campaign in an environment characterized by deep water and high-currents, where fatigue was driven by VIV. The measured vibration and current data are illustrated and the correlation is investigated. Important features of the wellhead fatigue damage rate trend are discussed. Fatigue life consumption tracking demonstrated that operations could safely continue, despite the arduous current conditions.
The wellhead monitoring methods discussed herein result in real-time or rapid turn-around of valuable fatigue life consumption information, enabling informed decisions to be made in adverse conditions. In a larger sense, measured data also serves as a benchmark for analytical model calibration activities, reducing the known conservatism in stress and fatigue in future deployments.