bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of Conventional Well Logs To Characterize Spatial Heterogeneity in Carbonate Formations Required for Prediction of Acid-Fracture Conductivity
Authors: Saneifar Mehrnoosh , Heidari Zoya , Hill A.D.. D. 
Published: March 2015

SummaryAcid etching, as the consequence of heterogeneous distribution of petrophysical and compositional properties, results in the conductivity of acid fractures in carbonate reservoirs. Reliable characterization of small-scale formation spatial heterogeneity by use of geostatistical analysis (i.e., variogram analysis) can improve prediction of acid-fracture conductivity significantly. Previous publications suggest that permeability correlation length can be used to assimilate spatial heterogeneity in prediction of acid-fracture conductivity. Well logs are good candidates to provide information about petrophysical and compositional properties of the formation with the required resolution for prediction of acid-fracture conductivity. However, the assessment of permeability and mineralogy from conventional well logs is challenging because of high spatial heterogeneity and complex pore structure. Rock typing has been suggested in the literature to improve permeability assessment in carbonates. Most of the previously introduced rock-typing methods are dependent on core measurements. However, core data are generally sparse and not available with the sampling rate required for prediction of acid-fracture conductivity.The main objective of this paper is to quantify formation spatial heterogeneity with variogram analysis of well logs and well-log-based estimates of petrophysical and compositional properties in carbonate reservoirs. We introduce an iterative permeability-assessment technique that is based on well logs, which takes into account characteristics of different rock classes in the reservoir. Furthermore, we propose three rock-classification techniques that are based on conventional well logs and that take into account static and dynamic petrophysical properties of the formation as well as mineral composition.We applied the proposed techniques successfully in two carbonate formations—Happy Spraberry oil field and Hugoton gas field. The petrophysical rock classification is in good agreement with identified core-derived rock classes. The results show approximately 54% improvement in permeability assessment compared with conventional permeability-assessment techniques, which can improve prediction of acid-stimulation jobs significantly. Finally, we investigated the direct application of well logs and well-log-based estimates of petrophysical and compositional properties for variogram analysis required to characterize formation spatial heterogeneity. We conducted variogram analysis in both field examples. The results show that the direct application of well logs and well-log-based estimates of petrophysical/compositional properties is reliable to characterize formation spatial heterogeneity. We also showed that application of well logs can enhance assessment of spatial heterogeneity compared with core measurements.
Reverse Cleanout in a Geothermal Well: Analysis of a Failed Coiled-Tubing Operation
Authors: Reinsch T. , Regenspurg S. , Feldbusch E. , Saadat A. , Huenges E. , Erbas K. , Zimmermann G. , Henninges J. 
Published: March 2015

Summary
During the production of geothermal brine from a production well in Groβ Schönebeck, Germany, an obstruction was observed when logging the reservoir interval of the well. Several bailer runs were performed to identify the cause, and it was discovered that mainly loose precipitates and fragments of coating from the production tubing were obstructing the well. To remove the fill from of the well, a reverse-cleanout operation with coiled tubing was performed. Because of wellbore restrictions, particle size, and the rheology of the fill, only a small portion of the obstruction could be removed. This paper describes the coiled-tubing operation and the application of a simple hydraulic model to explain possible reasons for failing to effectively clean out the well.
Characterization of growth and biochemical composition of sterlet, Acipenser ruthenus L., juveniles from the Dniester population reared in RAS
Authors: Khudyi Oleksy , Kolman Ryszard , Khuda Lidia , Marchenko Mykhailo , Terteryan Larisa 
Published: March 2015

Abstract
A broodstock was created with individuals from the diminishing natural sterlet, Acipenser ruthenus L., population in the upper area of the Dniester basin. Selects and spawners were reared in flow-through tanks with natural thermal regimes. This is the first time artificial reproduction has been performed with this species, followed by incubation and larval rearing. The experimental rearing was conducted in tanks in a recirculating aquaculture system, in which the basic environmental quality parameters were controlled, including water temperature, oxygen saturation, and levels of ammonia and nitrite. During rearing, growth rates and proximate composition of larvae and then juvenile were examined. It was confirmed that during the period of endogenous feeding there was a two-fold decrease in the contents of protein and lipids in the bodies of the larvae. The effects of feeding the sterlet juvenile two different types of commercial feed were compared, and it was confirmed that the feed had a significant impact on sterlet growth rates. The mean daily increase in the body weight of sterlet juvenile fed Skretting feed was 1.91%, while that in the group fed Aller feed was 0.97%. Additionally, the juvenile from the former group was characterized by higher contents of protein and lipids in both the liver and muscle and the fatty acid profile was more varied.
Determining the spring biomass peak of the smallest plankters in selected vendace lakes in Western Pomerania
Authors: Domagała Józef , Ługocki Słukasz , Czerniawski Robert , Pilecka-Rapacz Małgorzata 
Published: March 2015

Abstract
The aim of this study was to determine the prevalence peak of the smallest plankters that are an adequate food resource for vendace (Coregonus albula L.) larvae. This goal was accomplished by determining weekly changes in zooplankton biomass, especially rotifers and nauplii, against changes in basic physicochemical parameters of lake waters. As the results of this paper show, the highest abundance of the smallest plankters, rotifers and nauplii, occurs at a particular temperature for a period of two weeks. The most important variable that determined the peak of small plankter biomass is temperature. Thus, the period of stocking lakes with vendace larvae should be synchronized with this temperature and the coinciding biomass peak of rotifers and nauplii, which are the basic food of vendace larvae.
Improving Learning in a Traditional, Large-Scale Science Module with a Simple And Efficient Learning Design
Authors: Godsk Mikkel 
Published: March 2015

Abstract
This article presents the experiences and results of using a simple learning design for transforming a traditional, large-scale, face-to-face science module in calculus into blended learning where all face-to-face lectures were replaced by webcasts and online activities. The article presents the impact on teaching and learning in terms of how the teacher and the students used the materials and the impact on the students’ performance and satisfaction. The article concludes that replacing face-to-face lectures with webcasts and online activities has the potential to improve learning in terms of a better student performance, higher student satisfaction, and a higher degree of flexibility for the students. In addition, the article discusses implications of using learning design for educational development, how learning design may help breaking with the perception that facilitating blended learning is a daunting process, and, ultimately, its potential for addressing some of the grand challenges in science education and the political agenda of today
Positive Interaction Of Ethanol With Malic Acid In Postharvest Physiology Of Cut Spray Carnation ‘White Natila’
Authors: Begri Fatemeh , Hadavi Ebrahim , Nabigol Amrollah 
Published: March 2015

Abstract
In this study, succinic acid (0, 1 and 2 mM), malic acid (0, 1 and 2 mM), ethanol (0, 2 and 4% v/v), and their mixtures were applied as preservative solutions for cut flowers of spread carnation cv. ‘White Natila’ and their effect on the longevity, the amount of absorbed solution, malondialdehyde and chlorophyll content, cell membrane stability, fresh, and dry weight and on a visual quality was determined. A similarity in the effect of malic acid and succinic acid on dry weight and fresh weight loss were found. Ethanol positively affected most of the studied traits, including the vase life and fresh weight loss. The preservative solution containing 1 mM of malic acid and 4% ethanol resulted in the longest average vase life - 11.1 days compared to 8.9 days in the control. Malic acid showed a significant positive synergism with ethanol that makes it reasonable to combine them in preservative solutions intended to extend the vase life of cut spray carnation.
Leaves Of Cut Rose Flower Convert Exogenously Applied Glucose To Sucrose And Translocate It To Petals
Authors: Horibe Takanori , Yamaki Shohei , Yamada Kunio 
Published: March 2015

Abstract
To understand the role that the leaves play in the translocation of soluble carbohydrates in cut rose flowers, we first evaluated the effect of leaf removal on flower quality and the sugar content in petals. Cut rose flowers with leaves had higher soluble sugar content in petals compared with cut flower without leaves. Next, we treated cut flowers with radioactive glucose to clarify translocation routes of exogenously applied sugar. There was no significant difference between the specific radioactivity of sucrose and glucose in leaves, but specific radioactivity of sucrose in petals was much higher than that of glucose. These results suggested that most of the exogenously applied glucose first moved to the leaves, where it was converted into sucrose and then the synthesised sucrose was translocated to the petals. Our results showed that the leaves of cut rose flowers play an important role in the metabolism and transportation of exogenously applied soluble carbohydrates toward the petals, thus contributing to sustaining the post-harvest quality.
Effect Of Priming Of Seeds Of Medicago Sativa ‘Bami’ With Gibberellic Acid On Germination, Seedlings Growth And Antioxidant Enzymes Activity Under Salinity Stress
Authors: Younesi Omid , Moradi Ali 
Published: March 2015

Abstract
The experiment was conducted in order to study effects of seeds priming with gibberellic acid (GA3) at 0, 3, 5 and 8 mM on germination, growth and antioxidant enzymes activity in alfalfa seedlings under salinity stress (200 mM NaCl). All control seeds germinated. The rate of germinated seeds was reduced to 48% in the presence of NaCl, and increased to 76% after seeds priming with 5 mM GA3. Priming with 5 mM GA3 was also correlated with an increase of dry weight of seedlings derived from both stressed and non-stressed seeds as well as with the reduction of electrolyte leakage (EL) and malondialdehyde (MDA) level in salt stressed seedlings. The activity of superoxide dismutase, catalase, guaiacol peroxidase and ascorbate peroxidase in primed and non-primed seeds increased in the presence of NaCl and after priming of seeds with 5 mM GA3, whereas only small effect on glutathione reductase activity in both primed and non-primed seeds was observed. The total ascorbate level was higher in both stressed and non-stressed seedlings from primed seeds. These results suggest that GA3 priming might increase the salt tolerance of alfalfa seedlings through enhancing the activities of antioxidant enzymes and reducing the membrane damage as estimated using biomarkers, EL index and MDA content.
Homologous Recombination Repair Polymorphisms and the Risk for Osteosarcoma / Polimorfizam Gena Odgovornih Za Reparaciju Dnk Homolognom Rekombinacijom I Rizikza Pojavu Osteosarkoma
Authors: Goričar Katja , Kovač Viljem , Jazbec Janez , Lamovec Janez , Dolžan Vita 
Published: March 2015

Summary
Background: DNA repair mechanisms are essential for maintaining genome stability, and genetic variability in DNA repair genes may contribute to cancer susceptibility. Our aim was to evaluate the influence of polymorphisms in the homologous recombination repair genes XRCC3, RAD51, and NBN on the risk for osteosarcoma.
Methods: In total, 79 osteosarcoma cases and 373 controls were genotyped for eight single nucleotide polymorphisms (SNPs) in XRCC3, RAD51, and NBN. Logistic regression was used to determine the association of these SNPs with risk for osteosarcoma.
Results: None of the investigated SNPs was associated with risk for osteosarcoma in the whole cohort of patients, however, in patients diagnosed before the age of thirty years XRCC3 rs861539 C>T and NBN rs1805794 G>C were associated with significantly decreased risk for osteosarcoma (P=0.047, OR=0.54, 95% CI=0.30-0.99 and P=0.036, OR=0.42, 95% CI=0.19-0.94, respectively). Moreover, in the carriers of a combination of polymorphic alleles in both SNPs risk for osteosarcoma was decreased even more significantly (Ptrend=0.007). The risk for developing osteosarcoma was the lowest in patients with no wild-type alleles for both SNPs (P=0.039, OR=0.31, 95% CI=0.10-0.94).
Conclusions: Our results suggest that polymorphisms in homologous recombination repair genes might contribute to risk for osteosarcoma in patients diagnosed below the age of thirty years.
Decorating Cutting as New Approach to Machine Tool System Dynamics
Authors: Murcinkova Zuzana , Vasilko Karol 
Published: March 2015

Abstract
The paper presents so called decorating cutting focused on turning. It uses self-excited vibrations that are typical for turning and other types of cutting operations. The decorating turning do not utilize setting of unstable technological conditions of cutting process but it actively use the acting of cutting force on machine tool without generation of unwanted chatter vibrations. The special tool fixture was developed to utilize self-excited vibrations invoked by periodical changeability of cutting force by cutting process itself. Thus the typical texture of surface appears. The various macro/micro-textures of surfaces can be applied either for decorating purpose or for better holding of oil film.
Risk of Virological Failure in HIV-1-Infected Patients Experiencing Low-Level Viraemia under Active Antiretroviral Therapy (ANRS C03 Cohort Study)
Authors: Vandenhende Marie-Anne , Perrier Adélaïde , Bonnet Fabrice , Lazaro Estibaliz , Cazanave Charles , Reigadas Sandrine , Chêne Geneviève , Morlat Philippe ,   Groupe d'Epidémiologie Clinique du SIDA en Aquitaine
Published: March 2015

Background We assessed the association of persistent low-level viraemia between 50–199 copies/ml (LLV) with the risk of virological failure (VF) among HIV-1-infected patients receiving combination antiretroviral therapy (ART). Methods ART-naive and ART-experienced patients followed up in the ANRS-CO3 Aquitaine Cohort were included if they started two nucleoside reverse transcriptase inhibitors (NRTIs) with either one non-nucleoside reverse transcriptase inhibitor (NNRTI) or one protease inhibitor boosted with ritonavir (PI/r) between 2000 and 2011 and achieved viral load (VL)<200 copies/ml 4–8 months after initiating ART. VF was defined as either two consecutive VL≥200 copies/ml or one VL≥200 followed by a modification of ART. LLV was defined as at least two consecutive VLs between 50–199 copies/ml for at least one month. We used Cox models to estimate the association of LLV with VF. Results Among 2,374 patients with a median follow-up of 3 years, 205 (8.6%) experienced LLV. LLV was strongly associated with further VF (adjusted hazard ratio [aHR] 2.30, 95% CI 1.65, 3.20). LLV was associated with VF in ART-experienced patients (aHR 3.02, 95% CI 2.10, 4.33) but not in ART-naive patients. Neither type of ART regimen (PI/r- versus NNRTI-based regimen) nor cumulative duration of LLV was associated with VF. Conclusions Persistent LLV between 50–199 copies/ml was associated with VF among ART-experienced patients under ART. LLV between 50–199 copies/ml in ART-experienced patients should lead, after assessing patient's adherence and checking for drug interactions, to a closer monitoring and to consider ART optimization.
Le corps-mémoire
Authors: Lasvergnas Isabelle 
Published: March 2015

Partant de l’expérience de certaines cures marquées non pas tant par le silence de l’analysant que par une teneur très particulière de ses dires ancrés dans des symptômes corporels, on abordera la question de l’émergence du langage dans de telles problématiques psychiques, comme étant coextensive à une empreinte mémorielle caractérisée par un effacement du travail du préconscient auquel s’est substitué un corps « invasif ». Dans de tels cas, l’analyste est aux prises avec l’impression transmise d’une ossification de l’écriture psychique, un tissu mnésique cicatriciel entre mort et vif. L’article évoquera plus particulièrement un cas clinique par rapport auquel des sculptures d’Henry Moore ont produit dans l’écoute de l’analyste une médiation représentationnelle saisissante et fait fonction d’étayage contre-transférentiel. Les propositions théoriques de Winnicott, Pontalis et Fairbairn sur l’organisation de défenses reliées à un effondrement précoce, et sur des états émotivo-corporels sous-jacents à ces défenses, permettront d’appréhender un psychisme primitif fonctionnant à l’équivalence « d’habitus corporels », et dans lequel prédomine un moi narcissique en émergence indexé sur l’éprouvé d’un corps en désaide. L’auteure parlera en l’occurrence « d’un corps-mémoire-scriptural », celui dont elle dira qu’il est précisément question dans l’œuvre de Moore.
Réexamen de la méthodologie freudienne pour une recherche en psychanalyse aujourd'hui
Authors: De Battista Julieta , Askofaré Sidi 
Published: March 2015

L’article s’inscrit dans le champ plus vaste de la méthodologie de la recherche dans les sciences humaines et propose une réflexion sur l’apport freudien à partir de l’examen de quelques énoncés concernant les différences entre la position du chercheur et la position de l’analyste. Cette réflexion permet de faire une lecture des pas que Freud reconnaît dans son travail de recherche et propose aussi comme problématique l’inclusion de l’inconscient dans l’activité du chercheur. Que fait l’analyste quand il fait de la recherche ? Se sert-il de son inconscient comme instrument de recherche ? Fait-il confiance au domaine de l’inconscient dans l’élaboration de la trame ? L’inclusion de la dimension de l’inconscient dans la réflexion sur la méthodologie de la recherche en psychanalyse permet de repenser les possibles « points aveugles » du chercheur, qui apparaissent sous la forme des présuppositions et préjugés. Cette inclusion éclaire aussi une autre dimension de la recherche : celle de l’originalité apparente des découvertes. L’article propose comme conclusion que l’analyste chercheur introduit une nouvelle conception de l’objectivité dans la recherche : celle d’une subjectivité critiquée qui considère le rôle de l’inconscient du chercheur dans la production de la connaissance.
La revendication de reconnaissance de l'identité… devant la clinique de l'identification primaire
Authors: Putois Olivier 
Published: March 2015

On mobilise la clinique psychanalytique de l’identification primaire pour évaluer la théorisation de la revendication de reconnaissance en termes de confirmation de son identité, proposée par Honneth. On commence par montrer que cette conception, appuyée sur une lecture de Winnicott biaisée par l’approche de Trevarthen, souffre d’un biais innéiste : c’est seulement parce qu’elle dote l’individu d’un Soi inné qu’elle assimile l’interaction sociale à une confirmation. Là contre, on s’appuie sur la clinique des interactions précoces pour montrer que la fonction de la reconnaissance reçue de l’Autre n’est pas de confirmation, mais de constitution du Soi – elle conditionne l’identification primaire. En s’appuyant sur un cas de cothérapie parent-enfant, on développe le type de réflexivité que doit déployer cette reconnaissance pour favoriser le travail de l’identification primaire, en introduisant la notion de fonction visuelle du holding , ou holding visuel ; apparaît ainsi l’absence de Soi inné chez l’enfant. On conclut, de cette absence de Soi inné qu’indique la clinique, à l’inadéquation du modèle de la reconnaissance comme confirmation proposé par Honneth, de facture profondément spéculaire ; on y oppose une reconnaissance de nature symbolique qui, soulignant l’équivalence entre identification primaire et aliénation symbolique, libère paradoxalement le sujet de toute assignation identitaire définitive.
Les instruments de gestion médiateurs de la compétence collective ? Le cas du Lean dans une entreprise de l'automobile
Authors: Colin Thierry , Grasser Benoît 
Published: March 2015

La notion de compétence collective soulève de nombreux débats et paradoxes, à la fois évidence, lorsque l’on constate que les capacités opérationnelles mises en œuvre par un collectif donné ne se limitent pas et ne se déduisent pas de la somme des capacités individuelles des membres de ce collectif, et énigme, lorsque l’on se trouve démuni pour la décrire, la répertorier ou l’évaluer.	Cet article examine les effets produits sur la compétence collective par une instrumentation de gestion dont l’un des objectifs est de développer des processus d’apprentissage à différents niveaux. Il s’appuie d’un point de vue empirique sur une étude de cas, l’entreprise AUTO, qui a fait le choix d’implémenter les méthodes de gestion inspirées du Lean. Sur le plan théorique, il mobilise les théories de l’activité, dont l’intérêt est de permettre de lier analytiquement activité, instrument de gestion et production de compétence collective. Les résultats montrent que la médiation jouée par les instruments de gestion ne conduit à la production de compétence collective que sous certaines conditions : le système d’activité doit laisser suffisamment de marges d’interprétation aux différents acteurs, les règles d’incitation individuelles doivent être construites en cohérence avec le fonctionnement structurel du système d’activité, et il faut accorder toute son importance au rôle de pilote de la compétence collective que doit jouer le manager de proximité.
Vanishing of Massey Products and Brauer Groups
Authors: Efrat Ido , Matzri Eliyahu 
Published: March 2015

AbstractLet p be a prime number and F a field containing a root of unity of order p. We relate recent results on vanishing of triple Massey products in the mod-p Galois cohomology of F, due to Hopkins, Wickelgren, Mináč, and Tân, to classical results in the theory of central simple algebras. We prove a stronger form of the vanishing property for global fields.