bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of temperature on the structural, linear, and nonlinear optical properties of MgO-doped graphene oxide nanocomposites
Authors: Kimiagar Salimeh , Abrinaei Fahimeh 
Published: July 2017

Abstract
Magnesium oxide (MgO)-graphene oxide (GO) nanocomposites were prepared by the hydrothermal method at different temperatures. The effect of growth temperature on the structural, linear, and nonlinear optical (NLO) parameters was investigated. The decoration of MgO on GO sheets was confirmed by X-ray diffraction, scanning electron microscopy, Fourier transform infrared, and UV-visible (UV-vis) spectroscopy analyses. The energy band-gaps of MgO-GO nanocomposites were calculated from UV-vis spectrum using Tauc plot. The NLO parameters of MgO-GO nanocomposites were calculated for the first time by the simple Z-scan technique with nanosecond Nd:YAG laser at 532 nm. The nonlinear absorption coefficient β and nonlinear refractive index n
2 for MgO-GO nanocomposites at the laser intensity of 1.1×108 W/cm2 were measured to be in the order of 10−7 cm/W and 10−12 cm2/W, respectively. The third-order NLO susceptibility of MgO-GO nanocomposites was measured in the order of 10−9 esu. The results showed that MgO-GO structures have negative nonlinearity as well as good nonlinear two-photon absorption at 532 nm. Furthermore, the NLO parameters increased by the enhancement of the growth temperature. As the investigation of new materials plays an important role in the advancement of optoelectronics, MgO-GO nanocomposites possess potential applications in NLO devices.
Engineering light emission of two-dimensional materials in both the weak and strong coupling regimes
Authors: Brotons-Gisbert Mauro , Martínez-Pastor Juan P. , Ballesteros Guillem C. , Gerardot Brian D. , Sánchez-Royo Juan F. 
Published: July 2017

Abstract
Two-dimensional (2D) materials have promising applications in optoelectronics, photonics, and quantum technologies. However, their intrinsically low light absorption limits their performance, and potential devices must be accurately engineered for optimal operation. Here, we apply a transfer matrix-based source-term method to optimize light absorption and emission in 2D materials and related devices in weak and strong coupling regimes. The implemented analytical model accurately accounts for experimental results reported for representative 2D materials such as graphene and MoS2. The model has been extended to propose structures to optimize light emission by exciton recombination in MoS2 single layers, light extraction from arbitrarily oriented dipole monolayers, and single-photon emission in 2D materials. Also, it has been successfully applied to retrieve exciton-cavity interaction parameters from MoS2 microcavity experiments. The present model appears as a powerful and versatile tool for the design of new optoelectronic devices based on 2D semiconductors such as quantum light sources and polariton lasers.
Controllable all-fiber generation/conversion of circularly polarized orbital angular momentum beams using long period fiber gratings
Authors: Han Ya , Liu Yan-Ge , Wang Zhi , Huang Wei , Chen Lei , Zhang Hong-Wei , Yang Kang 
Published: July 2017

Abstract
Mode-division multiplexing (MDM) is a promising technology for increasing the data-carrying capacity of a single few-mode optical fiber. The flexible mode manipulation would be highly desired in a robust MDM network. Recently, orbital angular momentum (OAM) modes have received wide attention as a new spatial mode basis. In this paper, we firstly proposed a long period fiber grating (LPFG) system to realize mode conversions between the higher order LP core modes in four-mode fiber. Based on the proposed system, we, for the first time, demonstrate the controllable all-fiber generation and conversion of the higher order LP core modes to the first and second order circularly polarized OAM beams with all the combinations of spin and OAM. Therefore, the proposed LPFG system can be potentially used as a controllable higher order OAM beam switch and a physical layer of the translating protocol from the conventional LP modes communication to the OAM modes communication in the future mode carrier telecommunication system and light calculation protocols.
Regularized estimation in sparse high-dimensional multivariate regression, with application to a DNA methylation study
Authors: Zhang Haixiang , Zheng Yinan , Yoon Grace , Zhang Zhou , Gao Tao , Joyce Brian , Zhang Wei , Schwartz Joel , Vokonas Pantel , Colicino Elena , Baccarelli Andrea , Hou Lifang , Liu Lei 
Published: July 2017

AbstractIn this article, we consider variable selection for correlated high dimensional DNA methylation markers as multivariate outcomes. A novel weighted square-root LASSO procedure is proposed to estimate the regression coefficient matrix. A key feature of this method is tuning-insensitivity, which greatly simplifies the computation by obviating cross validation for penalty parameter selection. A precision matrix obtained via the constrained ℓ
Processing-structure-property correlations of in situ Al/TiB2 composites processed by aluminothermic reduction process
Authors: Vivekananda A.S. , Balasivanandha Prabu S. , Paskaramoorthy R. 
Published: July 2017

Abstract
This paper reports the influence of process parameters on the size and distribution of in situ titanium diboride (TiB2) particles within the aluminium (Al) matrix. TiB2 particles were formed as a result of the in situ reaction of potassium hexafluorotitanate (K2TiF6) and potassium tetra fluoroborate (KBF4) with molten Al. Two process parameters, namely, the addition time (AT) and holding time (HT) of precursor salts, were considered. The Al/TiB2 composites were produced by allowing the in situ reaction to occur at various ATs (10, 20, and 30 min) and HTs (20, 30, and 40 min). Results showed that the formation of TiB2 was confirmed by XRD analysis. The microstructure, TiB2 particle size, hardness, yield strength (YS), and ultimate tensile strength (UTS) were strongly affected by the said process parameters. The variations in hardness and UTS were highly consistent with those found in the microstructure of the composites. Compared with the Al parent material, the increase in the average hardness and UTS of the composite were 51% and 44%, respectively. This improvement was achieved for the composite sample fabricated with 20 min of AT and 30 min of HT. At this condition, the composite displayed near-uniform particle distribution.
Peirce, evolutionary aesthetics, and literary meaning: Tension, index, symbol
Authors: Hellberg Dustin 
Published: July 2017

AbstractThis paper will use several notions of Charles Peirce – his Categories and semiotics – and interweave evolutionary theory, neuroscience, and literary studies in order to connect the disciplines such that the natural sciences may be used as interpretive tools in literary exegesis. Despite the ostensible differences between literary texts and the endeavors of the natural sciences, Peirce’s ideas can put them into conversation. Current evolutionary literary theories like Literary Darwinism require a more solid footing and methodology from which to ground their hypotheses, and this paper will use a philosophical frame to connect the pieces. Peirce and those following his ideas provide the inroads for such a mixed methodology, which will undergird current evolutionary aesthetic practice without needlessly replacing other literary theories. This article will outline Peirce’s schema and a modern reconfiguration thereof, and then will posit that literature (here focusing on a short story) functions as a tension between the iconic, indexical, and symbolic modes of representation. Peirce’s Categories permit reality into the language/text/literature debate, and his notion of the Index can be used as reference to evolved traits inhomo sapiensin literary representation. Peirce gives organization, coherence, and cohesion without limiting the interpretational possibility of a literary work.
Analyzing the fictional worlds of Pixar with an eye on digital humanities
Authors: Candel Daniel , Giuliani Pedraza Marta , Madarova Slavka , Cáceres Paula Rubio , Sanz Marta Ruiz , Troyano Fernández María Victoria , Treija Kristīne 
Published: July 2017

AbstractThe present article tries to close the gap between the digital humanities and traditional criticism. It does so by moving between distant and close reading, constructing visualizations, opening perspectives for coding, and analyzing a large corpus: the Pixar movies up toThe Good Dinosaur. This is done with the help of a tool of analysis which studies fictional worlds and is wedged between value and method. After introducing the tool (Section 2), the main Pixar characters are placed within a spatiotemporal visualization of the tool and their semantic distribution is interpreted. This includes the organization of main characters, antagonists and remaining characters, and the gendering of characters and semantic spaces (Section 3). The article then discusses the limits of allocating characters in the visual diagram, above all by focusing on vertical and horizontal relationships, and complex semantic patterns (Section 4). It then discusses the differential aspects which make ofInside Outa different movie within the Pixar corpus (Section 5). The article closes by summarizing the different semantic patterns of Pixar movies, and by reflecting on the place of high abstraction, textual and visual, in this scheme, as well as on the complementarity of digital and traditional strategies.
Darth Vader in Ukraine: On the boundary between reality and mythology
Authors: Zaporozhtseva Lyudmyla 
Published: July 2017

AbstractIn the autumn of 2015, Star Wars once again rattled the world with a new episode, The Force Awakens. The first movie of the series was released in 1977, and ever since the 1980s emerging new episodes have turned this epopoeia into a recognizable mass cultural text that is well-known all over the world nowadays and which has been transformed into a wide range of forms such as series, comic strips, video games, toys, stickers and other forms of mass culture. However, what happens when a mass cultural text gets fused into a new context of political discourse? What kinds of unpredictable clashes of meanings might be evoked on the threshold of mass culture and ideology, dominative hierarchy and democratic masquerade, or even communist and capitalist semiosphere? What mythological meanings appear when a fictional hero acquires a real body and becomes a politician? The present paper puts forward a semiotic analysis of the eccentric performance of Darth Vader the politician in the contemporary Ukrainian political life. The case employs the concepts of text and transmedial world, as well as notions of remediation and resemiotization, in order to make sense of how political masquerade appears in the semiosphere of the Ukrainian spectator. In addition, the paper introduces the examples of semiotic interaction between the contemporary fictional character Darth Vader, his namesake politician, and the collective memory of both: the traditional culture and the Soviet ideological past.
Detektion zusammenhängender Farbregionen in Bildern mit Hilfe wahrnehmungsrelevanter Farbklassen
Authors: Hernández Mesa Pilar , Puente León Fernando 
Published: July 2017

Zusammenfassung
Die automatische Bildinterpretation durch Nachbildung der menschlichen visuellen Wahrnehmung ist eine Herausforderung mit vielen möglichen Einsatzgebieten. In diesem Beitrag wird die Detektion zusammenhängender Farb”-regionen in digitalen Bildern untersucht. Zu diesem Zweck werden durch psychologische Studien inspirierte wahrnehmungsrelevante Farbklassen herangezogen. Zuerst werden die wahrnehmungsrelevanten Farbklassen aus einem Datensatz, in dem mehr als 3,4 Millionen Farben benannt wurden, extrahiert. Anschließend wird eine Methode zur Detektion der Farb”-regionen vorgestellt und deren Leistungsfähigkeit sowohl für die Farb”-repräsentation im CIELAB‐Farbraum als auch mit Hilfe der wahrnehmungsrelevanten Farbklassen untersucht.
A New Homotopy Perturbation Scheme for Solving Singular Boundary Value Problems Arising in Various Physical Models
Authors: Roul Pradip , Warbhe Ujwal 
Published: July 2017

Abstract
The classical homotopy perturbation method proposed by J. H. He, Comput. Methods Appl. Mech. Eng. 178, 257 (1999) is useful for obtaining the approximate solutions for a wide class of nonlinear problems in terms of series with easily calculable components. However, in some cases, it has been found that this method results in slowly convergent series. To overcome the shortcoming, we present a new reliable algorithm called the domain decomposition homotopy perturbation method (DDHPM) to solve a class of singular two-point boundary value problems with Neumann and Robin-type boundary conditions arising in various physical models. Five numerical examples are presented to demonstrate the accuracy and applicability of our method, including thermal explosion, oxygen-diffusion in a spherical cell and heat conduction through a solid with heat generation. A comparison is made between the proposed technique and other existing seminumerical or numerical techniques. Numerical results reveal that only two or three iterations lead to high accuracy of the solution and this newly improved technique introduces a powerful improvement for solving nonlinear singular boundary value problems (SBVPs).
Mechanical, Electronic, and Optical Properties of β-B6O: First-Principles Calculations
Authors: Yang Ruike , Ma Shaowei , Wei Qun , Du Zheng 
Published: July 2017

Abstract
The mechanical, electronic, and optical properties of β-B6O are calculated by first-principles. The structural optimization and all properties are calculated by the method of generalized gradient approximation – Perdew, Burke and Ernzerhof (PBE). The hardness of β-B6O is 39 GPa under a pressure of 0 GPa, which indicates that it belongs to a hard material. The band gap is indirect with a value of 1.836 eV, showing that β-B6O is a semiconductor. The research of the electron localization function shows that the bonds of β-B6O are covalent bonds, which can increase the stability of the compound. The phonon dispersion curves present the dynamical stability of β-B6O under pressures of 0 and 50 GPa. The optical properties of β-B6O are also calculated. In the energy range from 0 to 18 eV, β-B6O presents high reflectivity; it has a strong absorption in the energy range from 3 to 18 eV. The refractive index results show that light propagates through the β-B6O in a difficult manner in the energy range from 6.9 to 16.5 eV. In addition, the energy of the plasma frequency for β-B6O is 16.6 eV and the peak value of the loss function is 13.6. These properties provide the basis for the development and application of β-B6O.
Crystal structures and thermal decomposition of permanganates AE[MnO4]2·n H2O with the heavy alkaline earth elements (AE=Ca, Sr and Ba)
Authors: Henning Harald , Bauchert Jörg M. , Conrad Maurice , Schleid Thomas 
Published: July 2017

Abstract
Reexamination of the syntheses and crystal structures as well as studies of the thermal decomposition of the heavy alkaline earth metal permanganates Ca[MnO4]2·4 H2O, Sr[MnO4]2·3 H2O and Ba[MnO4]2 are the focus of this work. As an alternative to the very inelegant Muthmann method, established for the synthesis of Ba[MnO4]2 a long time ago, we employed a cation-exchange column loaded with Ba2+ cations and passed through an aqueous potassium-permanganate solution. We later used this alternative also with strontium- and calcium-loaded columns and all the compounds synthesized this way were indistinguishable from the products of the established methods. Ca[MnO4]2·4 H2O exhibiting [CaO8] polyhedra crystallizes in the orthorhombic space group Pccn with the lattice parameters a=1397.15(9), b=554.06(4) and c=1338.97(9) pm with Z=4, whereas Sr[MnO4]2·3 H2O with [SrO10] polyhedra adopts the cubic space group P213 with a=964.19(7) pm and Z=4. So the harder the AE
2+ cation, the higher its demand for hydration in aqueous solution. Consequently, the crystal structure of Ba[MnO4]2 in the orthorhombic space group Fddd with a=742.36(5), b=1191.23(7) and c=1477.14(9) pm with Z=8 lacks any crystal water, but contains [BaO12] polyhedra. During the thermal decomposition of Ca[MnO4]2·4 H2O, the compound expels up to two water molecules of hydration, before the crystal structure collapses after the loss of the third H2O molecule at 157°C. The crystal structure of Sr[MnO4]2·3 H2O breaks down after the expulsion of the third water molecule as well, but this already occurs at 148°C. For both the calcium and the strontium permanganate samples, orthobixbyite-type α-Mn2O3 and the oxomanganates(III,IV) AEMn3O6 (AE=Ca and Sr) remain as final decomposition products at 800°C next to amorphous phases. On the other hand, the already anhydrous Ba[MnO4]2 thermally decomposes to hollandite-type BaMn8O16 and BaMnO3 at 800°C.
Mg(OCH3)2-mediated one-pot synthesis of α-aminophosphonate derivatives of cytosine under mild conditions
Authors: Yuan Jin-Wei , Li Wei-Jie 
Published: July 2017

AbstractAn efficient one-pot synthesis of α-aminophosphonates of cytosine with aldehydes, diisopropylH-phosphite, and cytosine with the help of simple magnesium methanolate was discovered. α-Aminophosphonates of cytosine were obtained in good yields under mild conditions. The reaction tolerates both electron-donating and electron-withdrawing substituents of aromatic and aliphatic aldehydes.
Comparison Between ODT and DNS for Ignition Occurrence in Turbulent Premixed Jet Combustion: Safety-Relevant Applications
Authors: Abdelsamie Abouelmagd , Lignell David O. , Thévenin Dominique 
Published: July 2017

Abstract
This work investigates the ability of the one-dimensional turbulence model (ODT) to detect, in a predictive manner, occurrence of successful ignition or misfire in a reacting gas mixture subjected to turbulence. Since ODT is computationally very efficient, this significantly aids in the analysis of safety-relevant applications. ODT delivers fast predictions, while still capturing most relevant physicochemical processes controlling ignition. However, ODT contains some empirical parameters that must be set by comparison with reliable reference data. In order to determine these parameters and check the accuracy of resulting ODT predictions, they are compared in this work with reference data from direct numerical simulation (DNS). DNS is recognized as the most accurate numerical tool to investigate ignition in turbulent flows. However, it requires very high computational times, so that it cannot be used for practical safety predictions. It is demonstrated in this article that, thanks to validation and comparison with DNS, ODT realizations can be used to predict correctly the occurrence of ignition in turbulent premixed flames while saving more than 90% of the required computational time, memory and disk space.
Inseminación Artificial de Alpacas con Semen Refrigerado y con Inclusión de Dos Tipos de Yema de Huevo
Authors: García V. Wilber , Alarcón B. Virgilio , Bravo M. Walter 
Published: July 2017

El objetivo del estudio fue evaluar el efecto de la yema de huevo fresca (YHF) y en polvo (YHP) sobre la motilidad, viabilidad, integridad funcional de la membrana plasmática (HOST) y tasa de preñez con semen fresco y refrigerado. Se colectaron 30 eyaculados de cinco alpacas mediante el método poscópula en los meses de enero a marzo. Los eyaculados fueron diluidos en Tris-glucosa y glicerol a una concentración final de 5%, y usando los dos tipos de yema de huevo a una concentración final de 20%. El semen diluido se separó en alícuotas y se mantuvo a 15 ºC por 8 h y a 5 ºC por 24 h, y se inseminaron 180 alpacas. El tipo de yema no afectó la motilidad, viabilidad y el valor HOST en los espermatozoides conservados a 15 y 5 ºC. De igual manera, los porcentajes de preñez no variaron cuando se inseminaron con semen fresco (50.0 y 46.7%), mantenido a 15 ºC (43.3 y 40%) o refrigerado a 5 ºC (33.3 y 30.0%) para YHF y YHP, respectivamente. La tasa de preñez fue mayor en hembras inseminadas con semen fresco (48.4%) y menor con semen refrigerado a 5 ºC (31.7%) (p&lt;0.05). Los resultados sugieren que la yema de huevo en polvo puede utilizarse como substituto de yema de huevo fresco en los diluyentes de conservación y refrigeración de semen de alpacas.
Clinical study of intra-abdominal pressure in the acute surgical abdomen
Authors: Neelam Kumari , Kumar Amit , Singh Vineet , Yadav Surjeet Kumar 
Published: July 2017

Background: Intra-abdominal pressure (IAP) is the steady-state pressure concealed within the abdominal cavity. Early recognition of rising abdominal pressure is critically important, because it allows prompt intervention which will prevent Abdominal compartment syndrome (ACS) from developing, leading to a much better prognosis for the patient. This prospective case-control study was aimed at characterisation of this entity in the commonly encountered acute surgical abdomen i.e. perforation peritonitis, intestinal obstruction and the blunt abdominal trauma. The stress was laid upon the detection of the intra-abdominal pressure in the patients and the effect of this entity upon the routinely available clinical and laboratory parameters of organ functions. The organ systems studied were the renal, cardiovascular and the pulmonary systems. The clinical outcome was also analysed.Methods: This is a prospective study conducted in Rajendra Institute of Medical Sciences, Ranchi, Jharkhand over a period of one and half year (January 2014 to June 2015). A total of 120 patients were studied, including 30 as controls. The intra-vesicular pressure was measured in all the subjects, which indirectly gives intraabdominal pressure.Results: Initial intra-abdominal pressure ranged from 0-31 cm of saline with the mean of 13.77±8.46. The mean values of the intra-abdominal pressure in the study groups i.e acute surgical cases were found to be significantly higher, as compared to that of the control group (p<0.01). Highest mortality was observed in the IAP range of >25 cm of saline (33.33%, 4 out of 12).Conclusions: Raised intraabdominal pressure significantly affects outcome and increases mortality.
A prospective study of prediction of outcomes in perforative peritonitis using apache II scoring system
Authors: Singh Rajinder , Madan Harprit Kaur , Tayade Sandeep H. 
Published: July 2017

Background: To predict the risk of mortality and morbidity in patients with perforative peritonitis using APACHE II scoring system. To evaluate the usefulness of APACHE II scoring system as a potential clinical and research tool which could be included as routine part of patient assessment in institution like ours.Methods: This was a prospective, observational study of prediction of outcomes in 80 patients of perforative peritonitis using APACHE II scoring system, conducted during the period of 2 years at our tertiary care institute.Results: Predicted death rate of the study was 17.31% and observed death rate was 25%. However, when observed and predicted death rates were compared in group of patients with APACHE II score of <10, it was over estimating the mortality. In group of patients with APACHE II score 11-20 and >20 it was underestimating the mortality. About 71.2% patients came under APACHE II score <10 with mortality of 3.5%. 23.7% came under group of patients with APACHE II score of 11-20 with mortality of 73.6% and only 5% patients had score >20 with 100% mortality were seen amongst them.Conclusions: In the present study, APACHE II scoring system was found to be accurate predictor of group outcome and can be effectively used in prediction of group outcome in similar population, but does not give sufficient confidence for outcome in an individual patient.