bluuebunny/crossref_metadata_2025_split huggingface dataset:
Influence of Different Curing Modes on Polymerization Behavior and Mechanical Properties of Dual-Cured Provisional Resins
Authors: Shibasaki S , Takamizawa T , Suzuki T , Nojiri K , Tsujimoto A , Barkmeier WW , Latta MA , Miyazaki M 
Published: June 2017

SUMMARY
This study determined the influence of curing mode on polymerization behavior and mechanical properties of dual-cured provisional resins. Three dual-cured bisacryl-based provisional resins were used: Tempsmart (TS; GC Corp), Luxatemp Automix Solar (LX; DMG Chemisch Pharmazeutishe Fabrik GmbH), and Integrity Multi·Cure (IG; Dentsply Caulk). A self-cured bisacryl-based provisional resin, Protemp Plus (PP; 3M ESPE) and a conventional poly(methyl methacrylate) (PMMA) provisional resin, Unifast III (UF; GC Corp) were used as controls. The inorganic filler content and coefficients of linear thermal expansion of the test materials were measured. Six specimens of each material were used to determine the flexural strength, elastic modulus, and resilience. The changes in ultrasound velocity during polymerization were measured. The average inorganic filler contents of the provisional resins, apart from UF, ranged from 24.4 to 39.3 wt%. The highest inorganic filler content was determined for LX, whereas TS showed the lowest value among the tested materials. The average coefficients of thermal expansion of the tested provisional resins ranged from 77.3 to 107.7 (×10−6/°C). TS and IG showed significantly lower thermal expansions than the other tested provisional resins. The mean flexural strengths of the provisional resins ranged from 70.4 to 122.6 MPa, the mean elastic moduli ranged from 1.8 to 3.7 GPa, and the mean resilience of the provisional resins ranged from 1.1 to 2.3 MJ/mm3, respectively. Dual-cured provisional resins showed significantly higher flexural strengths than the PMMA resin. However, in all cases, the light-curing mode showed significantly higher flexural strengths than the self-curing mode. In the initial polymerization phase, dual-cured resins in the light-curing mode showed a rapid increase in the speed of sound (V) during light irradiation, followed by a slower increase. Conversely, the dual-cured resins in the self-curing mode showed a slower initial increase, followed by a rapid increase. Although no significant difference in V was observed between 10 and 15 minutes in the light-curing mode of all tested dual-cured resins, a significantly higher V value was obtained at 15 minutes than at 10 minutes in the self-curing modes for LX and IG. Regardless of the curing mode, tested dual-cured provisional resins showed superior mechanical properties than the conventional PMMA provisional resin. However, dual-cured provisional resin flexural properties and polymerization behavior were affected by the curing mode. This study indicated that the light-curing mode might be recommended for all dual-cured provisional resins because of the enhancement of their mechanical properties and reduction of chair time.
Hacia la definición de un Modelo de Gestión, basado en la Asociación de los Sistemas establecidos en las normas internacionales de La Calidad, Ambiental y de Seguridad
Authors: Escobar Valencia Miriam 
Published: June 2017

Este artículo determina las posibilidades de establecer un Sistema de Gestión en el Ámbito de la Calidad, para que las organizaciones desarrollen en dicho sistema una estrategia, que bien puede derivarse de los enfoques que de manera general se les presentan, como los modelos de gestión, a manera de exigencias de mercado, y cuya aplicación en las empresas se realiza de forma independiente. Se propone elaborar una descripción de los modelos de gestión a manera de exigencias del mercado, y cuya aplicación en las empresas se realiza de forma independiente. Se propone elaborar una descripción de los modelos de gestión en sus temáticas generales: propósitos, principios, requisitos y arquitectura del modelo, establecidos como normas internacionales, para que a partir de la determinación de sus semejanzas y particularidades se establezca la temática conceptual que permite a la organización establecer su propio sistema de gestión. La propuesta formulada considera un solo modelo general que le permite a las organizaciones independientemente de su naturaleza y características particulares, cumplir las exigencias de competitividad, formalizando sus procesos respecto a normas o lineamientos de carácter general o particular, sin incurrir en esquemas individuales, según sea el ámbito económico en que la organización se desempeña.
VIP: Vortex Image Processing Package for High-contrast Direct Imaging
Authors: Gomez Gonzalez Carlos Alberto , Wertz Olivier , Absil Olivier , Christiaens Valentin , Defrère Denis , Mawet Dimitri , Milli Julien , Absil Pierre-Antoine , Van Droogenbroeck Marc , Cantalloube Faustine , Hinz Philip M. , Skemer Andrew J. , Karlsson Mikael , Surdej Jean 
Published: June 2017

Abstract
We present the Vortex Image Processing (VIP) library, a python package dedicated to astronomical high-contrast imaging. Our package relies on the extensive python stack of scientific libraries and aims to provide a flexible framework for high-contrast data and image processing. In this paper, we describe the capabilities of VIP related to processing image sequences acquired using the angular differential imaging (ADI) observing technique. VIP implements functionalities for building high-contrast data processing pipelines, encompassing pre- and post-processing algorithms, potential source position and flux estimation, and sensitivity curve generation. Among the reference point-spread function subtraction techniques for ADI post-processing, VIP includes several flavors of principal component analysis (PCA) based algorithms, such as annular PCA and incremental PCA algorithms capable of processing big datacubes (of several gigabytes) on a computer with limited memory. Also, we present a novel ADI algorithm based on non-negative matrix factorization, which comes from the same family of low-rank matrix approximations as PCA and provides fairly similar results. We showcase the ADI capabilities of the VIP library using a deep sequence on HR 8799 taken with the LBTI/LMIRCam and its recently commissioned L-band vortex coronagraph. Using VIP, we investigated the presence of additional companions around HR 8799 and did not find any significant additional point source beyond the four known planets. VIP is available at http://github.com/vortex-exoplanet/VIP and is accompanied with Jupyter notebook tutorials illustrating the main functionalities of the library.
A Method for Improving Galactic Cepheid Reddenings and Distances
Authors: Madore Barry F. , Freedman Wendy L. , Moak Sandy 
Published: June 2017

Abstract
We present a new photometric method by which improved high-precision reddenings and true distance moduli can be determined to individual Galactic Cepheids once distance measurements are available. We illustrate that the relative positioning of stars in the Cepheid period–luminosity (PL) relation (Leavitt law) is preserved as a function of wavelength. This information then provides a powerful constraint for determining reddenings to individual Cepheids, as well as their distances. As a first step, we apply this method to the 59 Cepheids in the compilation of Fouqué et al. Updated reddenings, distance moduli (or parallaxes), and absolute magnitudes in seven (optical through near-infrared) bands are given. From these intrinsic quantities, multiwavelength PL and color–color relations are derived. We find that the V-band period–luminosity–color relation has an rms scatter of only 0.06 mag, so that individual Cepheid distances can be measured to 3%, compared with dispersions of 6 to 13% for the one-parameter K through B PL relations, respectively. This method will be especially useful in conjunction with the new accurate parallax sample upcoming from Gaia.
Parsec-scale Obscuring Accretion Disk with Large-Scale Magnetic Field in AGNs
Authors: Dorodnitsyn A. , Kallman T. 
Published: June 2017

Abstract
A magnetic field dragged from the galactic disk, along with inflowing gas, can provide vertical support to the geometrically and optically thick pc-scale torus in AGNs. Using the Soloviev solution initially developed for Tokamaks, we derive an analytical model for a rotating torus that is supported and confined by a magnetic field. We further perform three-dimensional magneto-hydrodynamic simulations of X-ray irradiated, pc-scale, magnetized tori. We follow the time evolution and compare models that adopt initial conditions derived from our analytic model with simulations in which the initial magnetic flux is entirely contained within the gas torus. Numerical simulations demonstrate that the initial conditions based on the analytic solution produce a longer-lived torus that produces obscuration that is generally consistent with observed constraints.
Particle Acceleration in Mildly Relativistic Shearing Flows: The Interplay of Systematic and Stochastic Effects, and the Origin of the Extended High-energy Emission in AGN Jets
Authors: Liu Ruo-Yu , Rieger F. M. , Aharonian F. A. 
Published: June 2017

Abstract
The origin of the extended X-ray emission in the large-scale jets of active galactic nuclei (AGNs) poses challenges to conventional models of acceleration and emission. Although electron synchrotron radiation is considered the most feasible radiation mechanism, the formation of the continuous large-scale X-ray structure remains an open issue. As astrophysical jets are expected to exhibit some turbulence and shearing motion, we here investigate the potential of shearing flows to facilitate an extended acceleration of particles and evaluate its impact on the resultant particle distribution. Our treatment incorporates systematic shear and stochastic second-order Fermi effects. We show that for typical parameters applicable to large-scale AGN jets, stochastic second-order Fermi acceleration, which always accompanies shear particle acceleration, can play an important role in facilitating the whole process of particle energization. We study the time-dependent evolution of the resultant particle distribution in the presence of second-order Fermi acceleration, shear acceleration, and synchrotron losses using a simple Fokker–Planck approach and provide illustrations for the possible emergence of a complex (multicomponent) particle energy distribution with different spectral branches. We present examples for typical parameters applicable to large-scale AGN jets, indicating the relevance of the underlying processes for understanding the extended X-ray emission and the origin of ultrahigh-energy cosmic rays.
The Polarization Signature of Photospheric Magnetic Fields in 3D MHD Simulations and Observations at Disk Center
Authors: Beck C. , Fabbian D. , Rezaei R. , Puschmann K. G. 
Published: June 2017

Abstract
Before using three-dimensional (3D) magnetohydrodynamical (MHD) simulations of the solar photosphere in the determination of elemental abundances, one has to ensure that the correct amount of magnetic flux is present in the simulations. The presence of magnetic flux modifies the thermal structure of the solar photosphere, which affects abundance determinations and the solar spectral irradiance. The amount of magnetic flux in the solar photosphere also constrains any possible heating in the outer solar atmosphere through magnetic reconnection. We compare the polarization signals in disk-center observations of the solar photosphere in quiet-Sun regions with those in Stokes spectra computed on the basis of 3D MHD simulations having average magnetic flux densities of about 20, 56, 112, and 224 G. This approach allows us to find the simulation run that best matches the observations. The observations were taken with the Hinode SpectroPolarimeter (SP), the Tenerife Infrared Polarimeter (TIP), the Polarimetric Littrow Spectrograph (POLIS), and the GREGOR Fabry–Pèrot Interferometer (GFPI), respectively. We determine characteristic quantities of full Stokes profiles in a few photospheric spectral lines in the visible (630 nm) and near-infrared (1083 and 1565 nm). We find that the appearance of abnormal granulation in intensity maps of degraded simulations can be traced back to an initially regular granulation pattern with numerous bright points in the intergranular lanes before the spatial degradation. The linear polarization signals in the simulations are almost exclusively related to canopies of strong magnetic flux concentrations and not to transient events of magnetic flux emergence. We find that the average vertical magnetic flux density in the simulation should be less than 50 G to reproduce the observed polarization signals in the quiet-Sun internetwork. A value of about 35 G gives the best match across the SP, TIP, POLIS, and GFPI observations.
Search for GeV Counterparts to Fast Radio Bursts with Fermi
Authors: Xi Shao-Qiang , Tam Pak-Hin Thomas , Peng Fang-Kun , Wang Xiang-Yu 
Published: June 2017

Abstract
The non-repeating fast radio bursts (FRBs) could arise from catastrophic stellar explosions or magnetar giant flares, so relativistic blast waves might be produced in these events. Motivated by this, we search here for GeV counterparts to all non-repeating FRBs with the Fermi Large Area Telescope (LAT), including FRB 131104 that is claimed to be possibly associated with a γ-ray transient candidate detected by the Swift Burst Alert Telescope. FRB 131104 enters the field of view of LAT

after the burst time, so we are only able to search for the GeV afterglow emission during this period, but no significant GeV emission is detected. we also perform a search for GeV emissions from other FRBs, but no significant GeV emissions are detected either. Upper limit fluences in the range of

are obtained, and then the upper limits of the isotropic blast-wave kinetic energy of about

are inferred under certain assumptions. Although the current limits on the isotropic blast-wave energy are not sufficiently stringent to rule out the connection between FRBs and GRB-like transients, future more sensitive observations with Fermi or Imaging Atmospheric Cherenkov Telescopes might be able to constrain the connection.
Doing More With Less: A Centralized Model for Fellowship Program Coordination
Authors: Patel Twinkle , Schwan Katharina , Hoover Sara , O'Hollaren Allison , Sadat Suria , Siu Andrea , Bains Taranjit , van Schaik Sandrijn 
Published: June 2017

ABSTRACT

Background
Pediatrics fellowship programs typically are small, embedded in divisions, and vary in their approach to education. Program coordination usually falls to division administrators who operate in silos despite common requirements across programs, creating redundancy and inefficiency.

Objective
We examined the feasibility, acceptability, and impact of a centralized administrative model for pediatrics fellowship support at a large university-based institution.

Methods
In 2014, administrative support for the pediatrics fellowships at the University of California, San Francisco, was restructured from a model with division-level support to a centralized model. In the new model, a team of 6 full-time administrators supports 19 fellowship programs with a total of 80 fellows. The fellowship support team consists of 3 program coordinators, a data coordinator, a human resource coordinator, a team manager, and a faculty advisor. The team meets twice a month to discuss program issues and innovative ideas. Quarterly meetings are held with all coordinators and directors to discuss changes across fellowships and foster further collaboration. We surveyed program directors to examine the acceptability of the model and assessed its impact on finances and turnover.

Results
Of 19 eligible fellowship program directors, 15 (79%) completed the survey. The majority indicated that the new administrative model was “better” or “much better” than the prior model. The new model resulted in decreased costs (an estimated $250,000 per year in salary support) and lower staff turnover.

Conclusions
Centralization of fellowship administration is feasible and offers substantial benefits for all stakeholders involved.
Eliminating Residents Increases the Cost of Care
Authors: DeMarco Deborah M. , Forster Richard , Gakis Thomas , Finberg Robert W. 
Published: June 2017

ABSTRACT

Background
Academic health centers are facing a potential reduction in Medicare financing for graduate medical education (GME). Both the Medicare Payment Advisory Commission and the National Commission on Fiscal Responsibility and Reform (Deficit Commission) have suggested cutting approximately half the funding that teaching hospitals receive for indirect medical education. Because of the effort that goes into teaching trainees, who are only transient employees, hospital executives often see teaching programs as a drain on resources.

Objective
In light of the possibility of a Medicare cut to GME programs, we undertook an analysis to assess the financial risk of training programs to our institution and the possibility of saving money by reducing resident positions.

Methods
The chief administrative officer, in collaboration with the hospital chief financial officer, performed a financial analysis to examine the possibility of decreasing costs by reducing residency programs at the University of Massachusetts Memorial Medical Center.

Results
Despite the real costs of our training programs, the analysis demonstrated that GME programs have a positive impact on hospital finances.

Conclusions
Reducing or eliminating GME programs would have a negative impact on our hospital's bottom line.
Implementation of Scribes in an Academic Emergency Department: The Resident Perspective
Authors: Ou Evan , Mulcare Mary , Clark Sunday , Sharma Rahul 
Published: June 2017

ABSTRACT

Background
Medical scribes have been shown to improve emergency department (ED) throughput, physician productivity metrics, and patient satisfaction by fulfilling primary documentation and nonclinical functions. Little research has been done to date to study the effect of implementing a scribe program in a residency setting.

Objective
Our goal was to investigate emergency medicine residents' perception of their educational experience, including interactions with faculty, before and after the implementation of an ED scribe program.

Methods
We used a pre-post design to assess residents' perceptions of their educational experience before and after implementation of the scribe program. Residents at a large, urban academic medical center with an Accreditation Council for Graduate Medical Education–accredited, 4-year emergency medicine residency program were surveyed during August 2015 (prior to the implementation of the scribe program) and April 2016 (6 months after implementation).

Results
Residents reported improved educational experiences with statistically significant changes in the following areas: increased interaction with faculty due to fewer documentation requirements (P = .012); more face-to-face teaching with faculty (P &lt; .001); increased faculty supervision for procedures (P = .016); and a decrease of delays in patient disposition due to incomplete documentation (P = .029).

Conclusions
Implementation of an ED scribe program in an urban 4-year emergency medicine residency program led to improvements in residents' perceptions of their education.
Clinical and Functional Outcomes of Implant Prostheses in Fibula Free Flaps
Authors: Jain Ashish R 
Published: June 2017

ABSTRACT

Introduction
Functional reconstruction of jaw defects due to surgical resection is a challenge in maxillofacial surgery. The fibula free flap in combination with dental implants has exhibited growing popularity for such reconstructions. This study aimed at evaluating the clinical and functional outcome of dental implants inserted in fibula free flaps and dental implants used for orofacial reconstruction following ablation of tumors.

Materials and methods
A clinical follow-up study of 10 patients was conducted after oral surgery, who received vascularized fibula bone grafts and endosseous implants for functional jaw reconstruction during a 12-year period. The follow-up protocol included a clinical examination and radiological evaluation and interview using a questionnaire. Information on postoperative recovery after the surgical reconstruction phase and implant placement, type of diet, swallowing problems, speech intelligibility, lip competence, and perceived facial appearance was collected and analyzed.

Results
The survival rate of fibula free flap was 100%. The survival and success rates of implants placed in the fibula flaps at the end of the follow-up period were 100 and 94% respectively.

Conclusion
Implants placed in fibula bone grafts have been shown to integrate normally. Surgical reconstruction with vascularized fibula bone grafts followed by placement of dental implants after jaw resection can provide good clinical and functional outcomes for oral rehabilitation with a prosthesis.

How to cite this article
A riga P, N arayanan V, J ain A R, Philip JM, Nathan S. Clinical and Functional Outcomes of Implant Prostheses in Fibula Free Flaps. World J Dent 2017;8(3):171-176.
Synergistic Effects of Growth Factor, Bone Graft, and Resorbable Barrier Membrane in Management of Dehiscence and Fenestration of Dental Implants
Authors: Verma Umesh P 
Published: June 2017

ABSTRACTAimThe present study was primarily designed to evaluate the outcome of guided bone graft regeneration in peri-implant defects by combining recombinant human platelet-derived growth factor-BB (rhPDGF-BB) and granules of beta-tricalcium phosphate (B-TCP) mounted by resorbable biomesh membrane. Secondary objective was to determine the value of resorbable barrier membrane to improve the efficacy of the growth factormediated regeneration.Materials and methodsA randomized controlled study comprised 14 participants (8 males and 6 females, mean age 37 years, range 19—55 years), in which a total of 15 implants (10 in maxilla and 5 in the mandible) were placed. Fifteen implant sites were randomly divided by picking a code into three groups: Test group I (n = 5) ß-TCP + rhPDGF (0.3 mg/mL) + biomesh, test group II (n = 5) ß-TCP + rhPDGF, and control (n = 5) ß-TCP + biomesh. The experimental site was examined clinically for the gingival status and radiographically for the bone status.ResultsStatistically significant difference in preoperative and postoperative measurements was observed for test groups I and II in all the parameters except width; in contrast, there was no significant difference observed for the control group from baseline to 5 months postoperatively. On intergroup comparison, statistically significant difference was observed between test group I vs control group and test group II vs control group, but it was not significant between test groups I and II, which was further confirmed using global performance scale score.ConclusionIt concluded that rhPDGF-BB and ß-TCP mounted by resorbable biomesh membrane played a synergistic role in the management of peri-implant defects.Clinical significanceBone regenerated using ß-TCP with rhPDGF-BB in the reversal of peri-implant defects.How to cite this articleArora R, Verma UP, Dixit J, Lal N. Synergistic Effects of Growth Factor, Bone Graft, and Resorbable Barrier Membrane in Management of Dehiscence and Fenestration of Dental Implants. World J Dent 2017;8(3):177-182.