bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Influence of Remelting on the Properties of AlSi6Cu4 Alloy Modified by Antimony
Authors: Medlen D. , Bolibruchova D. 
Published: June 2012

The Influence of Remelting on the Properties of AlSi6Cu4 Alloy Modified by Antimony
The paper deals with the problem of multiple remelting influence on AlSi6Cu4 alloy modified by antimony on chosen mechanical characteristics, microstructure and gas content. This foundry alloy is used mostly in automotive industry. Foundry Aluminum-Silicon alloys are also used in number of industrial weight sensitive applications because of their low weight and very good castability and good mechanical properties. Modifiers are usually added to molten aluminum-silicon alloys to refine the eutectic phase particle shape and improve the mechanical properties of the final cast products and Al-Si alloys cast properties.
Antioxidant Activity of Milling Fractions of Selected Cereals
Authors: Ivanišová Eva , Ondrejovič Miroslav , Šilhár Stanislav 
Published: June 2012

Antioxidant Activity of Milling Fractions of Selected CerealsThe aim of this study was to evaluate antioxidant potential of four milling fractions of selected cereals grew in the year 2009 and 2010. Free radical scavenging activity of samples was measured using DPPH assay and reducing power was determined using FRAP assay. Secondary, total phenolic and flavonoid content of cereal extracts was evaluated. We found that flour fractions (break flour and reduction flour) showed the lower proportion of the total antioxidant potential than bran fractions (fine bran and coarse bran), which was balanced in observed years. Extract from barley had the highest values of antioxidant activity and polyphenol content.
Solid-Phase Extraction for Photometric Determination of Rosmarinic Acid in Lemon Balm (Melissa Officinalis) Extracts
Authors: Ondrejovič Miroslav , Maliar Tibor , Benkovičová Hana , Kubincová Jana 
Published: June 2012

Solid-Phase Extraction for Photometric Determination of Rosmarinic Acid in Lemon Balm (Melissa Officinalis) Extracts
The aim of this study was evaluation of the solid-phase extraction for elimination of interference compounds from lemon balm extracts aimed for photometric determination of rosmarinic acid. In experiments, evaluated conditions were as follows: composition and volume of mobile phase, ratio between volume of sample and mass of stationary phase and flow rate of mobile phase during separation. The results indicated that interfered compounds were eliminated. The lemon balm extracts should be pretreated by adsorption on normal stationary phase (silica gel) in ratio sample volume to silica gel weight 1:1 (v/w) elution by mobile phase - diethyl ether: acetic acid (9:1; v/v) - volume - 40 times of crude extract volume - with flow rate 5 ml/min. After selection of SPE conditions, the method was validated with comparison to HPLC analysis. The results suggest that this method may be useable for determination of rosmarinic acid by photometric measurement based on the complexation of Fe2+ ions with rosmarinic acid.
Painful Hypertrophic Osteoarthropathy and Metastatic Bone Lesions as the Initial Presentation of Lung Cancer
Authors: Hung Man-Hsin , Hou Kuan-Ting , Liu Chun-Yu 
Published: June 2012

The patient was a 67-year-old woman, who was evaluated by her primary care physician for progressively worsening right knee pain, described as constant in nature and as having been present for the past week. The patient's symptoms were insidious in onset, not associated with a traumatic event, and interfered with activities of daily living and sleeping. J Orthop Sports Phys Ther 2012;42(7):659. doi:10.2519/jospt.2012.0413
A Warpage Optimization Method for Injection Molding Using Artificial Neural Network Combined Weighted Expected Improvement
Authors: Shi H. , Wang X. , Xie S. 
Published: June 2012

Abstract
A surrogate-based warpage optimization for injection molding is proposed in this study. The optimization process aims at minimizing the warpage of the injection molding parts in which process parameters, i.e., the mold temperature, melt temperature, injection time, packing time, packing pressure, and cooling time are the design variables. The warpage values are reduced by optimizing the process parameters. A new optimization iteration scheme based on artificial neural network (ANN) combined weighted expected improvement (WEI) is employed to speed up the optimization process and to ensure very rapid and steady convergence. The ANN is used to build an surrogate warpage function for the process parameters, replacing the expensive simulation analysis in the optimization iterations. The adaptive process is executed by the WEI function, which is an infilling sampling criterion. Although the design of experiment (DOE) size is small, this criterion can precisely balance the local and global search and tend to find the global optimal design. As examples, a TV cover and a scanner are investigated. The results show that the proposed approach can effectively reduce the warpage of the injection molding parts.
Rotational Molding of Polyamide-6 Nanocomposites with Improved Flame Retardancy
Authors: Calò E. , Massaro C. , Terzi R. , Cancellara A. , Pesce E. , Re M. , Greco A. , Maffezzoli A. , Gonzalez-Chi P. I. , Salomi A. 
Published: June 2012

Abstract
The aim of this work was to develop polyamide-6/ organic-modified montmorillonite (omMMT) nanocomposites for the production of hollow parts by rotational molding. Particular emphasis was placed on the mechanical and flame retardancy properties needed for the fabrication of vessels for flammable liquids. The morphology of the melt compounded nanocomposites, produced by melt compounding, was investigated by X-ray diffraction measurements (WAXD), and Transmission Electron Microscopy (TEM) showed an exfoliated structure. Rheological measurements were used in order to verify whether the viscosity of materials was adequate for rotational molding. While thermomechanical analysis has revealed that neat PA6 and its nanocomposites were not suitable for rotational molding, due to the very low thermal stability of the polymer, the addition of a thermal stabilizer, shifted the onset of degradation to higher temperatures, thus widening the processing window of both PA6 and PA6 nanocomposites. Large-scale vessel prototypes were obtained by rotational molding of thermo-stabilized PA6 and its nanocomposites, and samples extracted from the rotomolded parts were characterized with respect to physical and mechanical properties. It was found that the PA6 nanocomposites exhibited significant improvements at cone calorimeter tests in comparison with neat PA6.
Effect of Blending Protocol on the Rheological Properties and Morphology of HDPE/LLDPE Blend-based Nanocomposites
Authors: Passador F. R. , Ruvolo-Filho A. , Pessan L. A. 
Published: June 2012

Abstract
Nanocomposites based on high density polyethylene (HDPE)/linear low density polyethylene (LLDPE) blend were prepared by melt compounding in a torque rheometer using an organoclay (montmorillonite) as nano-filler and maleic anhydride-grafted linear low density polyethylene (LLDPE-g-MA) as compatibilizer. The effects of five blending protocols on microstructure, crystallinity and rheological properties of the prepared samples were examined. The steady state rheological properties showed that the addition of nanoclay to the HDPE/LLDPE blend increased its shear viscosity at low shear rates changing the behavior of the HDPE/LLDPE matrix to a more pronounced shear thinning behavior. The blending sequence (LLDPE/LLDPE-g-MA/20A)/HDPE (where LLDPE and LLDPE-g-MA were first mixed with organoclay and then this system was later blended with HDPE) showed a lower slope of the log versus log curve and these results can be an indicative that the interactions between the matrix and the organoclay are stronger. The organoclay interlayer spacing and the crystallinity of the polymer domains were also influenced by the blending sequence. The crystallinity was calculated through the mathematical deconvolution of the peaks observed in the WAXD profiles. Overall, the crystallization of HDPE in the blends was hardly influenced by the presence of LLDPE. The blending sequence (LLDPE/LLDPE-g-MA/20A)/HDPE showed lower cristallinity when compared to others blending sequences. On the other hand, it was observed an increase in the organoclay interlayer spacing of this nanocomposite because the intercalation and/or exfoliation process occurs preferentially in the amorphous phase.
Cost-effectiveness of confirmatory techniques for the placement of lumbar pedicle screws
Authors: Sanborn Matthew R. , Thawani Jayesh P. , Whitmore Robert G. , Shmulevich Michael , Hardy Benjamin , Benedetto Conrad , Malhotra Neil R. , Marcotte Paul , Welch William C. , Dante Stephen , Stein Sherman C. 
Published: June 2012

Object
There is considerable variation in the use of adjunctive technologies to confirm pedicle screw placement. Although there is literature to support the use of both neurophysiological monitoring and isocentric fluoroscopy to confirm pedicle screw positioning, there are no studies examining the cost-effectiveness of these technologies. This study compares the cost-effectiveness and efficacy of isocentric O-arm fluoroscopy, neurophysiological monitoring, and postoperative CT scanning after multilevel instrumented fusion for degenerative lumbar disease.

Methods
Retrospective data were collected from 4 spine surgeons who used 3 different strategies for monitoring of pedicle screw placement in multilevel lumbar degenerative disease. A decision analysis model was developed to analyze costs and outcomes of the 3 different monitoring strategies. A total of 448 surgeries performed between 2005 and 2010 were included, with 4 cases requiring repeat operation for malpositioned screws. A sample of 64 of these patients was chosen for structured interviews in which the EuroQol-5D questionnaire was used. Expected costs and quality-adjusted life years were calculated based on the incidence of repeat operation and its negative effect on quality of life and costs.

Results
The decision analysis model demonstrated that the O-arm monitoring strategy is significantly (p < 0.001) less costly than the strategy of postoperative CT scanning following intraoperative uniplanar fluoroscopy, which in turn is significantly (p < 0.001) less costly than neurophysiological monitoring. The differences in effectiveness of the different monitoring strategies are not significant (p = 0.92).

Conclusions
Use of the O-arm for confirming pedicle screw placement is the least costly and therefore most cost-effective strategy of the 3 techniques analyzed.
Comparison of manually shaped and computer-shaped titanium mesh for repairing large frontotemporoparietal skull defects after traumatic brain injury
Authors: Luo JianMing , Liu Bin , Xie ZeYu , Ding Shan , Zhuang ZeRui , Lin Lan , Guo YanChun , Chen Hui , Yu Xiaojun 
Published: June 2012

Object
The object of this study was to compare the effects and complications of manual and computer-aided shaping of titanium meshes for repairing large frontotemporoparietal skull defects following traumatic brain injury.

Methods
From March 2005 to June 2011, 161 patients with frontotemporoparietal skull defects were observed. Patients were divided into 2 groups according to the repair materials used for cranioplasty: 83 cases used computer-aided shaping for the titanium mesh, whereas the remaining 78 cases used a manually shaped titanium mesh. The advantages and disadvantages of the 2 methods were compared.

Results
No case of titanium mesh loosening occurred in either group. Subcutaneous fluid collection, titanium mesh tilt, and temporal muscle pain were the most common complications. In the manually shaped group, there were 14 cases of effusion, 10 cases of titanium mesh tilt, and 15 cases of temporal muscle pain. In the computer-aided group, there were 6 cases of effusion, 3 cases of titanium mesh tilt, and 6 cases of temporal muscle pain. The differences were significant between the 2 groups (p < 0.05). Other common complications were scalp infection, exposure of titanium mesh, epidural hematoma, and seizures. In the computer-aided group, the operative time decreased (p < 0.01), the number of screws used was reduced (p < 0.01), and the satisfaction of patients was significantly increased (p < 0.05).

Conclusions
Computer-aided shaping of titanium mesh for repairing large frontotemporoparietal skull defects decreases postoperative complications and the operative duration, reduces the number of screws used, increases the satisfaction of patients, and restores the appearance of the patient's head, making it an ideal choice for cranioplasty.
Image-guided cerebrospinal fluid shunting in children: catheter accuracy and shunt survival
Authors: Levitt Michael R. , O'Neill Brent R. , Ishak Gisele E. , Khanna Paritosh C. , Temkin Nancy R. , Ellenbogen Richard G. , Ojemann Jeffrey G. , Browd Samuel R. 
Published: June 2012

Object
Cerebrospinal fluid shunt placement has a high failure rate, especially in patients with small ventricles. Frameless stereotactic electromagnetic image guidance can assist ventricular catheter placement. The authors studied the effects of image guidance on catheter accuracy and shunt survival in children.

Methods
Pediatric patients who underwent placement or revision of a frontal ventricular CSF shunt were retrospectively evaluated. Catheters were placed using either anatomical landmarks or image guidance. Preoperative ventricular size and postoperative catheter accuracy were quantified. Outcomes of standard and image-guided groups were compared.

Results
Eighty-nine patients underwent 102 shunt surgeries (58 initial, 44 revision). Image guidance was used in the placement of 56 shunts and the standard technique in 46. Shunt failure rates were not significantly different between the standard (22%) and image-guided (25%) techniques (p = 0.21, log-rank test). Ventricular size was significantly smaller in patients in the image-guided group (p < 0.02, Student t-test) and in the surgery revision group (p < 0.01). Small ventricular size did not affect shunt failure rate, even when controlling for shunt insertion technique. Despite smaller average ventricular size, the accuracy of catheter placement was significantly improved with image guidance (p < 0.01). Shunt accuracy did not affect shunt survival.

Conclusions
The use of image guidance improved catheter tip accuracy compared with a standard technique, despite smaller ventricular size. Failure rates were not dependent on shunt insertion technique, but an observed selection bias toward using image guidance for more at-risk catheter placements showed failure rates similar to initial surgeries.
Interactive virtual simulation using a 3D computer graphics model for microvascular decompression surgery
Authors: Oishi Makoto , Fukuda Masafumi , Hiraishi Tetsuya , Yajima Naoki , Sato Yosuke , Fujii Yukihiko 
Published: June 2012

Object
The purpose of this paper is to report on the authors' advanced presurgical interactive virtual simulation technique using a 3D computer graphics model for microvascular decompression (MVD) surgery.

Methods
The authors performed interactive virtual simulation prior to surgery in 26 patients with trigeminal neuralgia or hemifacial spasm. The 3D computer graphics models for interactive virtual simulation were composed of the brainstem, cerebellum, cranial nerves, vessels, and skull individually created by the image analysis, including segmentation, surface rendering, and data fusion for data collected by 3-T MRI and 64-row multidetector CT systems. Interactive virtual simulation was performed by employing novel computer-aided design software with manipulation of a haptic device to imitate the surgical procedures of bone drilling and retraction of the cerebellum. The findings were compared with intraoperative findings.

Results
In all patients, interactive virtual simulation provided detailed and realistic surgical perspectives, of sufficient quality, representing the lateral suboccipital route. The causes of trigeminal neuralgia or hemifacial spasm determined by observing 3D computer graphics models were concordant with those identified intraoperatively in 25 (96%) of 26 patients, which was a significantly higher rate than the 73% concordance rate (concordance in 19 of 26 patients) obtained by review of 2D images only (p < 0.05). Surgeons evaluated interactive virtual simulation as having “prominent” utility for carrying out the entire surgical procedure in 50% of cases. It was evaluated as moderately useful or “supportive” in the other 50% of cases. There were no cases in which it was evaluated as having no utility. The utilities of interactive virtual simulation were associated with atypical or complex forms of neurovascular compression and structural restrictions in the surgical window. Finally, MVD procedures were performed as simulated in 23 (88%) of the 26 patients .

Conclusions
Our interactive virtual simulation using a 3D computer graphics model provided a realistic environment for performing virtual simulations prior to MVD surgery and enabled us to ascertain complex microsurgical anatomy.
The accuracy of abnormal lumbar sonography findings in detecting occult spinal dysraphism: a comparison with magnetic resonance imaging
Authors: Chern Joshua J. , Aksut Baran , Kirkman Jennifer L. , Shoja Mohammadali M. , Tubbs R. Shane , Royal Stuart A. , Wellons John C. , Rozzelle Curtis J. 
Published: June 2012

Object
The purpose of this study was to correlate lumbar ultrasound (LUS) and MRI findings in patients suspected of having occult spinal dysraphism (OSD).

Methods
Over a 5-year period, 1273 consecutive infants underwent an LUS study at a major pediatric tertiary referral center. Of these, 106 patients had abnormal LUS findings suggestive of an OSD, and 103 underwent subsequent MRI studies. The anatomical descriptions of the 2 studies were compared for agreement.

Results
The average age of the infants was 34 days at the time of the LUS study; OSD was suspected in these patients because of the presence of cutaneous stigmata and congenital defects. The most common anatomical descriptions from the LUS study included a thickened or fatty filum (32 cases), filum cyst (11 cases), and presence of a terminal ventricle or syrinx (9 cases). Using MRI findings as the standard reference, the sensitivity of LUS in detecting a thickened or fatty filum was 20%. The sensitivity of detecting an abnormal conus level at or below L-3 was 76.9%.

Conclusions
In the patient population chosen to undergo LUS studies, abnormal findings had poor sensitivity at detecting anatomical findings consistent with OSD.
Le caractère socio-émotionnel des relations de soutien social à l'hôpital
Authors: Ruiller Caroline 
Published: June 2012

Résumé La dégradation des conditions de travail, notamment en France, est régulièrement dénoncée (Fondation de Dublin, 2002 ; Enquête Sumer, 2003). Le secteur hospitalier par les réformes successives qu’il traverse, vit une « crise morale » (Couanau, 2003). L’objet de cet article est de comprendre le concept de soutien social étudié en sociologie, psychologie, épidémiologie, mais méconnu par les chercheurs en Sciences de Gestion français. Les résultats exploratoires d’une étude de cas en milieu hospitalier (soixante-deux entretiens) montrent l’importance de la composante socio-émotionnelle et la co-existence d’un soutien « professionnel » et d’un soutien à la sphère « personnelle » de l’individu, dont l’expression se fait par l’ouverture aux autres, par l’empathie et par la transmission d’émotions positives.
L'éco-construction : quel positionnement pour les artisans ?
Authors: de Ferran Florence , Lallement Jeanne , Sueur Isabelle 
Published: June 2012

Résumé Quel positionnement pour l’artisan qui s’inscrit dans une démarche de développement durable ? A partir de cette interrogation, cette recherche explore les perceptions de l’éco-construction par les consommateurs. Après avoir présenté le cadre conceptuel, nous présentons la démarche exploratoire utilisée. 14 entretiens semi-directifs ont été conduits auprès de clients d’éco-artisans. Une analyse de contenu nous permet d’identifier ce qui caractérise un éco-artisan et les axes de communication utiles à leur positionnement.
Client « exécutant », « assistant marketing opérationnel », « relais » ou « apporteur de solutions » : Dis-moi ce que tu fais, je te dirai qui tu es !
Authors: Bonnemaizon Audrey , Cadenat Sandrine , Benoit-Moreau Florence , Renaudin Valérie 
Published: June 2012

Résumé Les entreprises tendent à impliquer le consommateur dans la production du service depuis de nombreuses années. Ces approches se développent aujourd’hui massivement et prônent une nouvelle vision des consommateurs, véritables partenaires de marché, co-créateurs de valeur, et non plus simples réceptacles passifs d’offres. Ce phénomène de participation constitue un courant de recherche assez récent, tant en marketing qu’en sociologie de la consommation mais il semble toutefois nécessaire de réarticuler les différents champs théoriques afin de mieux comprendre les dispositifs mis en place par les entreprises et les intérêts que les clients peuvent en retirer. Cette recherche met en évidence quatre figures du consommateur : le client exécutant , l’ assistant marketing , le relais ou encore l’ apporteur de solutions . Elle précise ainsi son rôle attendu dans la création du service.
Les cadres expatriés au Mexique : défis et conseils clés
Authors: Arcand Sébastien , Hernández Báez Annabel 
Published: June 2012

Résumé Dans le contexte de l’accélération du processus de mondialisation, l’expatriation des cadres est de plus en plus fréquente. À partir d’une analyse des actions entreprises par des cadres québécois travaillant au Mexique, nous décrivons dans cet article les quatre principaux défis auxquels ils font face : le défi des rapports hiérarchiques et de la supervision, le défi de la communication et des relations interpersonnelles, le défi de la participation et de la motivation du personnel ainsi que le défi de l’intégration des équipes de travail. Nous indiquons également les pratiques que les expatriés appliquent pour s’adapter à leur nouvel environnement. Finalement, nous proposons deux conseils clés aux cadres qui veulent réussir leur projet d’expatriation ainsi que deux recommandations clés que leurs sièges sociaux ou maisons mères doivent mettre en œuvre afin de faciliter leur intégration et leur adaptation.
Comprendre les préoccupations du conjoint qui doit suivre un expatrié à l'étranger
Authors: Mérignac Olivier , Roger Alain 
Published: June 2012

Résumé L’article s’adresse principalement à des personnes vivant en couple et dont le conjoint est susceptible de se voir proposer un emploi à l’étranger. Ces personnes se demandent généralement si elles doivent suivre leur conjoint à l’étranger ; ce que leur conjoint et son employeur peuvent faire pour les appuyer ou pour aider les enfants à s’intégrer ; s’il est possible de tenir compte de la situation du couple et plus largement de la famille dans cette décision de l’expatriation ; comment faire pour que l’expatriation soit une occasion de développement pour tous les membres de la famille ; comment éviter un retour prématuré et accroître les retombées positives et le succès du séjour. Voilà autant d’interrogations sur lesquelles cet article se penche et offre matière à réflexion.