bluuebunny/crossref_metadata_2025_split huggingface dataset:
First-Principles Study of Lattice Dynamics, Structural Phase Transition, and Thermodynamic Properties of Barium Titanate
Authors: Zhang Huai-Yong , Zeng Zhao-Yi , Zhao Ying-Qin , Lu Qing , Cheng Yan 
Published: July 2016

Abstract
Lattice dynamics, structural phase transition, and the thermodynamic properties of barium titanate (BaTiO3) are investigated by using first-principles calculations within the density functional theory (DFT). It is found that the GGA-WC exchange-correlation functional can produce better results. The imaginary frequencies that indicate structural instability are observed for the cubic, tetragonal, and orthorhombic phases of BaTiO3 and no imaginary frequencies emerge in the rhombohedral phase. By examining the partial phonon density of states (PDOSs), we find that the main contribution to the imaginary frequencies is the distortions of the perovskite cage (Ti-O). On the basis of the site-symmetry consideration and group theory, we give the comparative phonon symmetry analysis in four phases, which is useful to analyze the role of different atomic displacements in the vibrational modes of different symmetry. The calculated optical phonon frequencies at Γ point for the four phases are in good agreement with other theoretical and experimental data. The pressure-induced phase transition of BaTiO3 among four phases and the thermodynamic properties of BaTiO3 in rhombohedral phase have been investigated within the quasi-harmonic approximation (QHA). The sequence of the pressure-induced phase transition is rhombohedral→orthorhombic→tetragonal→cubic, and the corresponding transition pressure is 5.17, 5.92, 6.65 GPa, respectively. At zero pressure, the thermal expansion coefficient α

V
, heat capacity C

V
, Grüneisen parameter γ, and bulk modulus B of the rhombohedral phase BaTiO3 are estimated from 0 K to 200 K.
LSPS/Optogenetics to Improve Synaptic Connectivity Mapping: Unmasking the Role of Basket Cell-Mediated Feedforward Inhibition
Authors: Brill Julia , Mattis Joanna , Deisseroth Karl , Huguenard John R. 
Published: July 2016

AbstractNeocortical pyramidal cells (PYRs) receive synaptic inputs from many types of GABAergic interneurons. Connections between parvalbumin (PV)-positive, fast-spiking interneurons (“PV cells”) and PYRs are characterized by perisomatic synapses and high-amplitude, short-latency IPSCs. Here, we present novel methods to study the functional influence of PV cells on layer 5 PYRs using optogenetics combined with laser-scanning photostimulation (LSPS). First, we examined the strength and spatial distribution of PV-to-PYR inputs. To that end, the fast channelrhodopsin variant AAV5-EF1α-DIO-hChR2(E123T)-eYFP (ChETA) was expressed in PV cells in somatosensory cortex of mice using an adeno-associated virus-based viral construct. Focal blue illumination (100–150 µm half-width) was directed through the microscope objective to excite PV cells along a spatial grid covering layers 2–6, while IPSCs were recorded in layer 5 PYRs. The resulting optogenetic input maps showed evoked PV cell inputs originating from an ∼500-μm-diameter area surrounding the recorded PYR. Evoked IPSCs had the short-latency/high-amplitude characteristic of PV cell inputs. Second, we investigated how PV cell activity modulates PYR output in response to synaptic excitation. We expressed halorhodopsin (eNpHR3.0) in PV cells using the same strategy as for ChETA. Yellow illumination hyperpolarized eNpHR3.0-expressing PV cells, effectively preventing action potential generation and thus decreasing the inhibition of downstream targets. Synaptic input maps onto layer 5 PYRs were acquired using standard glutamate-photolysis LSPS either with or without full-field yellow illumination to silence PV cells. The resulting IPSC input maps selectively lacked short-latency perisomatic inputs, while EPSC input maps showed increased connectivity, particularly from upper layers. This indicates that glutamate uncaging LSPS-based excitatory synaptic maps will consistently underestimate connectivity.
T3 enhances Ang2 in rat aorta in myocardial I/R: comparison with left ventricle
Authors: Sabatino Laura , Kusmic Claudia , Nicolini Giuseppina , Amato Rosario , Casini Giovanni , Iervasi Giorgio , Balzan Silvana 
Published: July 2016

Angiogenesis is important for recovery after tissue damage in myocardial ischemia/reperfusion, and tri-iodothyronine (T3) has documented effects on angiogenesis. The angiopoietins 1/2 and tyrosine kinase receptor represent an essential system in angiogenesis controlling endothelial cell survival and vascular maturation. Recently, in a 3-day ischemia/reperfusion rat model, the infusion of a low dose of T3 improved the post-ischemic recovery of cardiac function. Adopting this model, our study aimed to investigate the effects of T3 on the capillary index and the expression of angiogenic genes as the angiopoietins 1/2 and tyrosine kinase receptor system, in the thoracic aorta and in the left ventricle. In the thoracic aorta, T3 infusion significantly improved the angiogenic sprouting and angiopoietin 2 expression. Instead, Sham-T3 group did not show any significant increment of capillary density and angiopoietin 2 expression. In the area at risk (AAR) of the left ventricle, T3 infusion did not increase capillary density but restored levels of angiopoietin 1, which were reduced in I/R group. Angiopoietin 2 levels were similar to Sham group and unchanged by T3 administration. In the remote zone, T3 induced a significant increment of both angiopoietin 1/2. In conclusion, T3 infusion induced a different response of angiopoietin 1/2 between the ventricle (the AAR and the remote zone) and the thoracic aorta, probably reflecting the different action of angiopoietin 1/2 in cardiomyocytes and endothelial cells. Overall, these data suggest a new aspect of T3-mediated cardioprotection through angiogenesis.
Seroprevalencia de Leptospira spp. en ganado bovino lechero de la región Huetar Norte de Costa Rica
Authors: Sequeira Soto Jorge , Valverde Jiménez María De los Ángeles , Araya Sánchez Luis Nazario , Sequeira Avalos José Alfredo , Oviedo Manrique 
Published: July 2016

Se realizó un estudio transversal, en la región Huetar Norte de Costa Rica, para determinar la seropositividad a Leptospira spp en ganado bovino lechero (2010-2012). Esta región presenta alta incidencia de la infección en humanos. Es la de mayor producción lechera en el país. Se procesó 2375 muestras de suero por la técnica del microaglutinación (MAT), correspondientes a 36 fincas lecheras asociadas a la Cooperativa de Productores de Leche Dos Pinos. La seroprevalencia global detectada, al considerar como positivos aquellos títulos mayores a 1:160, fue de 9.13%, observándose títulos de hasta 1:5120 en animales clínicamente sanos. El comportamiento, entre fincas, fue heterogéneo, detectándose porcentajes de positividad entre 0-25% en los animales analizados. Los serogrupos, más frecuentemente identificados, correspondieron a Pomona (15.7%), Tarassovi (16.6%) y Hebdomadis (25.8%). Se detectó una asociación, estadísticamente significativa (p<0.05) con serogrupos asociados a algunas de las fincas muestreadas. De igual manera, las fuentes de agua utilizadas por las fincas presentaron asociación estadística (p< 0.05) con la positividad hacia Leptospira spp. Esta asociación no se identificó para la edad o la raza del animal (p>0.05).
Elastic properties and electronic structure of the Ni3Sb (cF16) intermetallic
Authors: Deluque Críspulo E. , Ramos Susana B. , Fernández Armando J. 
Published: July 2016

ABSTRACTThe possibilities of Ni as contact material in electronic applications has motivated the interest on the intermetallic phases of the Ni-Sb system, in relation to their use in lead free micro-soldering processes. In this work, a detailed theoretical study of the cohesive and thermodynamic properties of the compound Ni3Sb in the (cF16) Fm-3m structure is reported. To this aim, the Full Potential Linearized Augmented Plane Waves method, within the framework of the Density Functional Theory and both Generalized Gradient and Local Density approximations, has been applied. The structural parameters, cohesive and elastic properties of this compound and its constituent elements have been determined. In particular, the equilibrium structural properties are determined through the minimization of the energy, including the full relaxation of the internal degrees of freedom of the cell. It is shown that the calculated properties agree well with the available experimental data. Moreover, various contributions to the electronic density of sates are studied. On this basis, a discussion is presented of the bonding characteristics of this compound, in the framework of the current ideas about cohesion in p-d bonded intermetallics.
Nanostructured LB films developed from poly(p-acryloylaminophenylmethylphosphonic) acid
Authors: Lazo-Jiménez Rosa E. , Chávez-Carvayar José A. , Herrera-González Ana M. , Islas-Pérez Valentin , Carreón-Castro María P. 
Published: July 2016

ABSTRACTIn this paper, the formation of Langmuir-Blodgett films of poly(p-acryloylaminophenylmethylphosphonic) acid polymers, with general formula (C10H12NPO4)n are reported. The Langmuir-Blodgett (LB) technique was used for building ordered nanostructures in molecular assemblies of these polymers, which were able to form stable films. At the air-water interface, these polymers (with low and high molecular weight) formed Langmuir (L) monolayers, which were characterized by surface pressure versus molecular area (π-A) isotherms and Brewster´s Angle Microscopy (BAM). Using the LB method, molecular mono and multilayer films of these polymers were prepared and transferred onto glass substrates forming Z-type multilayers, with a transfer ratio close to unity. These LB films were characterized by Atomic Force Microscopy (AFM).
Superficial and electrical characterization of thin films based on Chitosan/polypyrrole/MWCNT
Authors: Olarte-Paredes A. , Salgado-Delgado R. , Salgado-Delgado A. M. , Rubio-Rosas E. , García-Hernández E. , Vargas-Galarza Z. 
Published: July 2016

ABSTRACTIn recent decades conducting polymers have attracted attention due to their promising and versatile applications in different fields. There is a considerable interest in the application of nanotubes multilayer carbon (MWCNT) because of their unique structure, high electrical conductivity, high chemical stability, and high surface-to-volume ratio. These properties make MWCNT extremely attractive for fabricating sensors. Composites based on a matrix of a biopolymer such as the chitosan (CS) with a lot of conductive polymers or (MWCNT), have received increasing attention due to their attractive structural, mechanical and electrical properties that could have applications in different fields such as tissue engineering, biomedicine, and manufacture of sensors and biosensors. Have been reported conducting polymer composites with an extensive range of interesting mechanical and electrical properties, which is reported in this paper to obtain films by ultrasonic bath mixing of Chitosan 3% w/v using polypyrrole (PPy) and multilayer carbon nanotubes. Surface characterization was performed using scanning electron microscopy (SEM). The electrical properties were analyzed using electrochemical impedance spectroscopy (EIS) in a frequency range 0.01 - 10E+5 Hz to 10 mV AC. The results show that the films of CS/PPy/MWCNT have a homogeneous distribution where the chitosan envelops the loads, while for EIS retention load was observed within the matrix observing these materials in accordance with the equivalent circuit of Warburg showing diffusional process.
Sophisticated Lady
Authors: Istvandity Lauren 
Published: July 2016

Like many popular music genres, jazz has historically been dominated by male figures, while female musicians, despite their contributions, are often overlooked. This article takes for its focus female vocalists, arguing that they frequently face compounded issues of discrimination based on gender. Contextualized in the jazz scene of Brisbane, Australia, the author describes a situation in which, reflective of historic practices, women are generally not taken as seriously as men. Further to this, vocalists, who in this scene are more likely to be female, are often compared negatively to instrumentalists in terms of knowledge and application of jazz theory and musicianship. As a result, female vocalists are ensnared by their gender and may have difficulty building a profile as respected musicians. Using autoethnographic methods, the author explores how vocalists need to carefully manage their performance of gender through a fluid approach to expressions of femininity, dependent on their performance for an audience or for other musicians.
“Don’t Worry, it’s Just a Girl!”
Authors: Gunn Rachael 
Published: July 2016

In this article, I analyse how bodily potential is culturally regulated in Sydney's breakdancing (breaking) scene through drawing both on my breakdancing practice and interviews conducted with prominent figures in this scene. I critically examine my lived experiences as one of only a few female breakdancers ("b-girls") in Sydney through analytic autoethnography, and use the theoretical tools of Deleuze and Guattari to unpack and challenge normative gendered narratives. With breakdancing culturally inscribed as masculine ("b-boying") and its conventions interlocking with broader patriarchal restrictions that inhibit female participation and bodily expression, I argue that the Sydney breaking scene is both a site of transgression and regression for the female body. This paradox confronting the b-girl sees her participation as "othered", while also challenging normative assumptions of gender. Through situating specific practices of breaking within broader Australian culture and gender norms, I examine how the performances of b girls and b-boys in Australia disrupt the stability of binary logic on which the organization of bodies is so heavily reliant and, in doing so, allow for the experience of breaking as a site of "pure" difference.
Effects of alkali–aggregate reaction on concrete and structures
Authors: Shayan Ahmad 
Published: July 2016

The effects of alkali–aggregate reaction (AAR) on concrete and structures start at the microstructural level, that is, at molecular and microscopic levels, such as the formation of reaction products in concrete and associated microcracking, which ultimately leads to macro-level effects such as visual cracking, differential movements, displacement and so on. The consequences of these effects are also wide ranging, and depend on the severity of the reaction, the configuration and functions of the affected element and the exposure conditions. The effects of AAR on concrete can range from minor cracking in non-load-bearing elements in benign environments, which may not have any significant consequence, to severe cracking in sensitive structural elements, particularly those exposed to aggressive environments, which could have serious detrimental effects on the mechanical and durability properties of concrete. This paper provides an overview of the changes that occur in the mechanical and durability properties of AAR-affected concrete elements.
Postpartum Mood Disorders Screening in the NICU
Authors: Scheans Patricia , Mischel Rebecca , Munson Margi , Bulaevskaya Katya 
Published: July 2016

AbstractMaternal depression is increasingly recognized as the leading complication of childbearing. A mother’s mental health impacts the well-being and long-term outcomes of her children. This column will discuss a systematic approach to screening for maternal postpartum mood disorders (PPMDs) and referring women to resources according to an established algorithm. This work was undertaken in a tertiary referral NICU and performed by dedicated NICU personnel with the goals of optimizing NICU infants’ outcomes and supporting maternal and family health and well-being.
A didática do cinema nos processos de ensino-aprendizagem: teoria e práxis educativa
Authors: Lima Rui 
Published: July 2016

Resenha do livro: Alves, Luís Alberto; García García, Francisco; Alves, Pedro (Coord.) Aprender del cine: narrativa y didáctica Madrid: Icono14 Editorial; Porto: CITCEM, 2014. 232p.
Un método cualitativo para el análisis del entorno urbano arquitectónico a partir de los imaginarios urbanos
Authors: Guzmán Ramírez Alejandro , Acosta Pérez José de Jesús 
Published: July 2016

Introducción: El objetivo de la etnografía en educación es hacer una descripción minuciosa de los sucesos del aula; de su cotidianidad. Para con ello retratar las visiones del mundo de los participantes y de ahí obtener las estructuras de significado que como grupo construyen para explicarse su mundo. En el caso de la arquitectura se parte de la idea de que el entorno que nos envuelve puede imaginarse como un sistema de información en el que, el medio urbano, la forma física de la arquitectura y la ciudad podrían interpretarse como la traducción de imaginarios hondamente enraizados en la psique de quienes habitan esos espacios.De suerte que el acto individual y colectivo de construirse para sí mismo un ambiente revela la serie de estructuras de pensamiento que regula las relaciones entre las personas y la estructura física de su hábitat. Método: Dada la naturaleza de nuestro estudio ésta se basa en la investigación cualitativa del entorno, partiendo de técnicas etnográficas como lo son la entrevista a profundidad y el análisis de mapas mentales basados en los estudios realizados por el Dr. Benito Narváez Tijerina quien explora las dimensiones del dibujo espontáneo con el que los habitantes describen la ciudad, estableciendo las relaciones de esa clase de representaciones con los rasgos edificados del paisaje para evidenciar las relaciones entre la morfogénesis de la ciudad imaginaria y la ciudad real.Resultados: Las dimensiones perceptivas e imaginarias se superponen mas no son excluyentes de la dimensión material-arquitectónica de la urbe. La ciudad no es capturada solamente por los sentidos, sino que se interioriza e identifica con nuestro propio cuerpo y con nuestra experiencia existencial; el habitante de la ciudad a través de un proceso cognitivo, recoge la información necesaria aportada por los sentidos y proyecta sus propias imágenes mentales sobre la ciudad. A partir de los imaginarios constituidos por imágenes, informaciones, experiencias, simbolismos y fantasías se reconstruyen visiones del mundo con efectos y propósitos de la acción cotidiana expresados en el hábitat. La apropiación simbólica del espacio y a la "constitución de lugares" a través de los imaginarios urbanos; permite entender la multiplicidad de fragmentos y formas de hacer ciudadDiscusión o Conclusión: El sentido de lugar, permite entender la construcción del hábitat a partir de las experiencias, significados y emociones de los sujetos, tomando un papel central en la cimentación de las identidades socio-territoriales. La apropiación, la pertenencia y la identificación del ciudadano con su ciudad no sólo es posible comprenderla a través de las formas espaciales, sino en su estrecha relación con las interacciones y situaciones de la vida social.
Evaluación de vacunas autógenas como herramienta para el control de la Mastitis durante la lactancia en vacas Holstein
Authors: Sepúlveda Aceves Juan , Sepúlveda Reséndiz Rubén , Arias Aida , Villegas Abraham 
Published: July 2016

Se evaluó la eficacia de las autovacunas como herramienta en el control de mastitis en 52 vacas en producción. Se cultivó leche de los animales seleccionados y de los microorganismos ambientales aislados se preparó una autovacuna polivalente de células muertas con pseudocápsula, se aplicaron 2 dosis de 5 ml cada una con intervalo de 15 días a 26 animales, el resto de ellos fue un grupo control, los animales tenían características similares. Se contaron las células somáticas por mililitro de leche (CCS / ml) cada tercer día desde la primera aplicación de vacuna hasta completar 30 días, el grupo vacunado mantuvo una media geométrica con menor número de células somáticas por mililitro (272,952) que el grupo control (326,098); se obtuvo una reducción del 16.2% (p= 0.01). Luego se midieron células somáticas cada mes durante 6 meses y el grupo tratamiento presentó una reducción de 23% (p = 0.02) con respecto al grupo control (252,000 y 328,500 ccs/ml respectivamente). También se observó en animales vacunados una reducción de la incidencia de mastitis subclínica de 16.9% y clínica de 35.3% (p= 0.01 y p= 0.1). A su vez se registró la producción promedio de leche de 0 a 30 días pos tratamiento, la cual fue superior en los animales vacunados por 0.6 L (2.7%, p = 0.04), de 15 días a 4 meses pos tratamiento 1.9 L (7.3%, p < 0.05) y de 15 días a 6 meses pos tratamiento de 1.1 L (4.3%, p < 0.05). Las vacunas autógenas demostraron ser efectivas para control de mastitis subclínica y clínica además de ayudar a mejorar la producción láctea.
Análisis de plasmas inducidos por láser con excitación multipulso para el proceso de ablación de areolas de Tuna
Authors: Flores Reyes Teresa , Vidal Ponce Luis , Rodríguez Eugenio , De Posada Eduardo , Arronte Miguel Ángel 
Published: July 2016

Introducción: La técnica de análisis de plasmas inducidos por láser (LIBS), posee importantes ventajas como son que la muestra no requiere preparación previa, puede estar en fase sólida, liquida o gaseosa y tener cualquier forma y dimensión, se requiere una cantidad mínima de material y, finalmente, el análisis se realiza en tiempo real. Estas ventajas, hacen posible el seguimiento en tiempo real de un proceso de ablación láser, incluso para muestras de composición compleja. Para el monitoreo de un proceso industrial, esta herramienta sería más adecuada, si se cuenta con una calibración del equipo y un protocolo particular definido. En el trabajo, se ejemplifica esta posibilidad para el caso de la ablación láser de areolas de Tuna (fruto de el Opuntia ficus-indica). Método: Se realiza el análisis LIBS de muestras de tuna, tanto en las areolas como en la corteza. Para la excitación del plasma se emplea un láser de Nd:YAG en régimen de Q:Switch con tren de pulsos. Con el objeto de asegurar el reconocimiento de las líneas en los espectros LIBS, se realizaron análisis en patrones de composición conocida, estableciéndose un protocolo para la interpretación de los espectros. Resultados: Se logró una clara lectura de la línea de H ubicada en 656.2 nm. Se estableció un protocolo para la interpretación de los espectros, que permitió la identificación de 49 picos característicos. Finalmente, se determina la composición para la corteza y la areola y se lleva a cabo una comparación cualitativa entre éstas.Discusión: Se muestra que la excitación láser en forma de tren de pulsos, entendido este régimen como modalidad particular del Q:Switch, permite la determinación eficiente de elementos, con una adecuada relación señal-ruido. Por otra parte, que es posible determinar diferencias composicionales evidentes entre corteza y la areola, lo cual permite monitorear un proceso de ablación de areolas con láser de manera simple.