bluuebunny/crossref_metadata_2025_split huggingface dataset:
Older Sexual Partners and Adolescent Females’ Mental Health
Authors: Meier Ann , Erickson Gina A. , McLaughlin Heather 
Published: February 2016

CONTEXTThe physical health detriments associated with adolescent females’ having older romantic partners are well documented. However, little is known about the relationship between having an older partner and females’ subsequent mental health.METHODSTwo waves of data from 1,440 participants in the National Longitudinal Study of Adolescent Health were analyzed. The sample was restricted to females in grades 7–12 who had not had sex at Wave 1 (1994–1995) and reported at least one romantic relationship by Wave 2 (1996). A lagged dependent variable approach with ordinary least‐squares regression measured changes in depression and self‐esteem associated with sexual and nonsexual relationships with same‐age and older partners. Intimate partner violence was tested as a mediator.RESULTSCompared with respondents reporting a nonsexual relationship with a same‐age partner, those reporting a nonsexual relationship with an older partner, sex with a same‐age partner or sex with an older partner experienced greater increases in depression between surveys; mean predicted depression levels at Wave 2 ranged from 7.7 to 9.0 across these groups (possible range, 0–27). Intimate partner violence explained one‐third of the difference between those who had had sex and those who had not had sex with same‐age partners. Fewer associations were found for self‐esteem, and differences between groups were small.CONCLUSIONSHealth correlates of adolescent sexual behavior go beyond physical health outcomes. Future research should identify mechanisms through which relationships, especially those with older partners, are associated with declines in mental health.
Investigation on the ability of first trimester glycodelin and angiopoietin-2 to predict small-for-gestational age pregnancies at delivery
Authors: Hansen Young Bae , Myrhøj Vibeke , Jørgensen Finn Stener , Sørensen Steen 
Published: February 2016

AbstractThe aim was to investigate whether first trimester glycodelin and angiopoietin-2 can predict small-for-gestational age (SGA) at delivery, individually or in combination.In this case-control study we measured glycodelin and angiopoietin-2 on serum from 170 singleton pregnant women delivering SGA neonates and 985 singleton pregnant women delivering normal-weighted neonates. All values were converted to multiples of the medians (MoM).Pregnant women delivering SGA neonates had lower first trimester glycodelin and angiopoietin-2 MoM values [median (interquartile range)] compared with pregnant women delivering normal-weighted neonates for glycodelin: 0.86 (0.58–1.24) vs. 1.03 (0.74–1.45), p<0.001, and for angiopoietin-2: 0.89 (0.69–1.19) vs. 1.01 (0.78–1.31), p<0.001. The prediction performances of the biomarkers showed that the areas under the curve (AUC) were 0.59 (glycodelin), 0.58 (angiopoietin-2), and 0.60 (glycodelin and angiopoietin-2).We demonstrated that first trimester glycodelin and angiopoietin-2 were associated with SGA, but they were, individually and in combination, poor predictors of SGA at delivery. The AUCs were low which indicate low detection rates and high false positive rates.
Vertex-Based Compatible Discrete Operator Schemes on Polyhedral Meshes for Advection-Diffusion Equations
Authors: Cantin Pierre , Ern Alexandre 
Published: February 2016

Abstract
We devise and analyze vertex-based, Péclet-robust, lowest-order schemes for advection-diffusion equations that support polyhedral meshes. The schemes are formulated using Compatible Discrete Operators (CDO), namely, primal and dual discrete differential operators, a discrete contraction operator for advection, and a discrete Hodge operator for diffusion. Moreover, discrete boundary operators are devised to weakly enforce Dirichlet boundary conditions. The analysis sheds new light on the theory of Friedrichs' operators at the purely algebraic level. Moreover, an extension of the stability analysis hinging on inf-sup conditions is presented to incorporate divergence-free velocity fields under some assumptions. Error bounds and convergence rates for smooth solutions are derived and numerical results are presented on three-dimensional polyhedral meshes.
Analysis of twist level and take-up speed impact on the tensile properties of PVA/PA6 hybrid nanofiber yarns
Authors: Fakhrali Aref , Ebadi Seyed Vahid , Gharehaghaji Ali Akbar , Latifi Masoud , Moghassem Abdolrasool 
Published: February 2016

AbstractIn this work, polyvinyl alcohol/nylon6 hybrid nanofiber yarns were produced to achieve good properties of each component. The influence of the twist level in the range of 3000–14,666 tpm and take-up speed in the range of 2.5–8.5 cm/min of yarns on the tensile properties was investigated. The highest strength and elongation at break of yarns were achieved in twist level and take-up speed of about 11,000 tpm (8.13±0.72 cN/tex and 72.44±7.64%) and 6.5 cm/min (6.20±0.57 cN/tex and 70.23±7.95%), respectively. Excessive values over these amounts caused a drastic decrement in tensile properties. This could be due to the loss nanofiber arrangement in the yarn structure that was confirmed by the study of orientation of the nanofibers in the yarns by the SEM images. These yarns have the potential to be used in medical applications such as a non-absorbable suture due to the drug loading ability and bio-compatibility properties of PVA nanofibers.
Regulation of necroptosis signaling and cell death by reactive oxygen species
Authors: Fulda Simone 
Published: February 2016

Abstract
Necroptosis has recently been identified as an alternative form of programmed cell death that is characterized by defined molecular mechanisms. Reactive oxygen species (ROS) are involved in the regulation of numerous signaling pathways, as they are highly reactive and can cause (ir)reversible posttranslational modifications. While the role of ROS in other modes of cell death has been extensively studied, its impact on necroptotic signaling and cell death is far less clear. The current minireview discusses the evidence for and against a role of ROS in necroptosis.
Dynamic Recrystallization Behavior of Ti22Al25Nb Alloy during Hot Isothermal Deformation
Authors: Zhang Jingli , Guo Hongzhen , Liang Houquan 
Published: February 2016

AbstractDynamic recrystallization (DRX) of Ti22Al25Nb alloy has been investigated based on the analysis of hot compression experimental data in this paper. The true stress–strain curves of Ti22Al25Nb can be divided into two types: the single-peak conventional dynamic recrystallization (CDRX) curves and the multi-peak discontinuous dynamic recrystallization (DDRX) curves. The multi-peak curves indicate the alternate dominance of hardening mechanism and softening mechanism. A critical Zener–Hollomon parameter ln ZC has been proposed to divide CDRX from DDRX. The hardening rate and DRX volume fraction of CDRX and DDRX have been analyzed. In addition, the effect of the second-phase particle on the DRX has been studied. DRX process was enhanced by the second-phase particles, but the growth process of recrystallized grains was restrained.
Professional Development Needs of Novice Nursing Clinical Teachers: A Rapid Evidence Assessment
Authors: Jetha Farah , Boschma Geertje , Clauson Marion 
Published: February 2016

AbstractThe current nursing profession is challenged with a decreasing supply of competent clinical teachers due to several factors consequently impacting the quality of nursing education. To meet this demand, academic nursing programs are resorting to hiring expert nurses who may have little or no teaching experience. They need support during their transition from practice to teaching. Using the systematic approach of a Rapid Evidence Assessment (REA), scholarly literature was reviewed to identify existing professional development needs for novice clinical teachers as well as supportive strategies to aid the transition of experienced nurses into teaching practice. The REA included 29 relevant studies. Findings revealed three main professional development needs for novice clinical teachers and key supportive strategies. Based on these findings recommendations for best practices to support and prepare novice clinical teachers are presented.
Dynamische Kalibrierung eines Mehrkomponentensensors für Kraft und Drehmoment
Authors: Schleichert Jan , Rahneberg Ilko , Fröhlich Thomas 
Published: February 2016

Zusammenfassung
Mehrkomponenten Kraft-/Drehmomentsensoren werden in Anwendungen eingesetzt, in denen die
Richtung der Kraft- und Drehmomentvektoren sowie deren Betrag nicht bekannt oder zeitlich
veränderlich ist. Beispiele hierfür sind in der Robotik, der Strömungsmessung leitfähiger
Fluide nach dem Prinzip der Lorentzkraftanemometrie oder in der zerstörungsfreien
Werkstoffprüfung zu finden. Entgegen den Anforderungen der Messung findet oft nur eine
statische Kalibrierung dieser Sensoren statt, was zu Abweichungen führt, wenn Messgrößen in
der Nähe der Resonanzfrequenz des Sensors und darüber erfasst werden sollen. Anhand einer
dynamischen Kalibrierung erhält man den Frequenzgang der Sensormechanik, welcher die
Grundlage für das Design eines geeigneten Filters zur Kompensation dynamischer
Messabweichungen liefert. Im Folgenden werden die dynamischen Eigenschaften eines
Mehrkomponenten Kraft-/Drehmomentsensors untersucht indem verschiedene Testsignale mit Hilfe
eines Tauchspulaktors eingeleitet werden. Die Messergebnisse werden mit numerischen
Berechnungen und statischen Kalibrierwerten verglichen. Für die Kompensation des dynamischen
Verhaltens wird ein inverses Filter bestimmt, welches auch als dynamische Kalibrierfunktion
angesehen werden kann.
Robust Finite-Time Passivity for Discrete-Time Genetic Regulatory Networks with Markovian Jumping Parameters
Authors: Sakthivel R. , Sathishkumar M. , Kaviarasan B. , Anthoni S. Marshal 
Published: February 2016

AbstractThis article addresses the issue of robust finite-time passivity for a class of uncertain discrete-time genetic regulatory networks (GRNs) with time-varying delays and Markovian jumping parameters. By constructing a proper Lyapunov–Krasovskii functional involving the lower and upper bounds of time delays, a new set of sufficient conditions is obtained in terms of linear matrix inequalities (LMIs), which guarantees the finite-time boundedness and finite-time passivity of the addressed GRNs for all admissible uncertainties and satisfies the given passive performance index. More precisely, the conditions are obtained with respect to the finite-time interval, while the exogenous disturbances are unknown but energy bounded. Furthermore, the Schur complement together with reciprocally convex optimisation approach is used to simplify the derivation in the main results. Finally, three numerical examples are provided to illustrate the validity of the obtained results.
Mn Adsorption on the GaAs(111)–(2×2)B Surface: First Principles Studies
Authors: Guerrero-Sanchez Jonathan , Castro-Medina J. , Rivas-Silva J. F. , Takeuchi Noboru , Morales de la Garza L. , Varalda J. , Mosca D. H. , Cocoletzi Gregorio H. 
Published: February 2016

Abstract
Mn adsorption on the GaAs(111)–(1×1)B surface
electronic and magnetic properties are investigated using first principles total energy
calculations within the periodic spin polarized density functional theory. Results show that
one Mn atom adsorption on top of the surface drives to an interstitial Mn
atom. The interstitial atom is bonded to three first monolayer As atoms forming
a chain-like structure. This stable structure has a ferromagnetic behavior with a Mn
magnetic moment of ∼ 3.98 μ
B
. The Mn coverage
increase yields a stable structure with the creation of an interstitial Mn layer,
which in turn gives rise to a GaMnAs like alloy at the surface. The layer displays
a ferromagnetic characteristic with magnetic moment of
∼ 4.40 μ
B
. A surface formation energy analysis of all
these stable structures shows that one Mn interstitial monolayer and a Mn
interstitial atom may coexist. Density of states shows that there is an important
contribution of the Mn atoms to the occupied and unoccupied states. The DOS of one
Mn monolayer is metallic with the most important contribution around the Fermi level
coming from the Ga-p and Mn-d orbitals.
Spectral Properties of α and β L Rhamno-Indigo Molecules and Activities Prediction Through NBO Analysis. A DFT Study
Authors: Adjir Khadidja , Sekkal-Rahal Majda , Moncomble Aurélien , Cornard Jean-Paul 
Published: February 2016

Abstract
Structural and physical properties such as some spectral features of α-L rhamno-indigo and β-L rhamno-indigo molecules
are presented in this paper. Results are compared with those of 5,5'-dichloro-indigo N-β-glycosidic 4-amino-4,6-didesoxyglucose
(Akashine A) that exhibits a strong inhibitory activity against various human tumor cell lines. Density functional theory (DFT) using
B3LYP functional and 6-31G+(d,p), 6-311+G(2d,p) and cc-pvdz as basis sets was applied to perform these studies. Calculations were
carried out both in gas phase and with DMSO as an implicit solvent. Gauge including atomic orbitals (GIAO) approach was used to
calculate 1H NMR chemical shifts and Time dependent density functional theory (TD-DFT) calculations were performed to
determine the electronic transitions and their nature within the molecules. Moreover, stabilization energies of intra and
intermolecular interactions were determined using NBO analyses. Local reactivity descriptors were computed to give insight in the
nature of reactive sites. Overall, it has been shown that the nature of the glycosidic linkages has a significant influence on the
molecular properties.
Natural Extension of Hartree–Fock Through Extremal 1-Fermion Information: Overview and Application to the Lithium Atom
Authors: Benavides-Riveros Carlos L. , Schilling Christian 
Published: February 2016

Abstract
Fermionic natural occupation numbers do not only obey Pauli's exclusion principle but are
even stronger restricted by so-called generalized Pauli constraints. Whenever given natural
occupation numbers lie on the boundary of the allowed region the corresponding N-fermion
quantum state has a significantly simpler structure. We recall the recently proposed
natural extension of the Hartree–Fock ansatz based on this structural simplification. This
variational ansatz is tested for the lithium atom. Intriguingly, the underlying mathematical
structure yields universal geometrical bounds on the correlation energy reconstructed by
this ansatz.
Caminhos para a investigação da alternância de pronomes de segunda pessoa em Santa Catarina
Authors: Christiane Maria Nunes de Souza Christiane Maria Nunes de , Coelho Izete Lehmkuhl 
Published: February 2016

<div class="page" title="Page 49"><div class="section"><div class="layoutArea"><div class="column"><p><span>Neste estudo, com base nos pressupostos da Teoria da Variação e Mudança Linguística, apresentamos resultados das primeiras pesquisas referentes à descrição da alternância dos pronomes </span><span>tu </span><span>e </span><span>você </span><span>em posição de sujeito em cartas pessoais de Santa Catarina, a partir de uma perspectiva diacrônica. Em um primeiro momento, analisamos cartas de florianopolitanos ilustres escritas nos séculos XIX e XX, constatando a entrada do pronome </span><span>você</span><span>, sempre em sua forma plena, nos dados do século XX. Partimos, então, para uma análise diatópica, em que comparamos missivas produzidas por informantes não ilustres das cidades de Florianópolis e Lages na segunda metade do século XX, apontando para uma preferência geral pelo uso da forma </span><span>tu </span><span>na capital catarinense e para uma preferência geral pelo uso da forma </span><span>você </span><span>na cidade do planalto – sendo que o pronome-sujeito </span><span>tu </span><span>manifesta- se majoritariamente em sua forma nula e o pronome-sujeito você manifesta-se majoritariamente em sua forma plena em ambas as localidades. Os resultados sugerem, além um já pressuposto contraste diacrônico (entrada do pronome </span><span>você </span><span>no sistema de tratamento do século XX), também um contraste diastrático (entre a escrita dos informantes ilustres e a escrita dos informantes não ilustres) e um contraste diatópico (entre a escrita da cidade de Florianópolis e a escrita da cidade de Lages). </span></p></div></div></div></div>
Comportamiento y eficiencia de polinización de <i>Bombus atratus</i> Franklin en pimentón (<i>Capsicum annum</i> L.) sembrado bajo invernadero
Authors: Riaño J. Diego , Pacateque E. Johanna , Cure José Ricardo , Rodríguez Daniel 
Published: February 2016

<p>El pimentón es un cultivo promisorio para Colombia, sin embargo está poco tecnificado. La polinización mediada por colonias de abejorros del género <em>Bombus </em>ha sido una técnica utilizada exitosamente en éste y otros cultivos a nivel mundial pero en nuestro país es una práctica poco conocida. <em>Bombus atratus </em>Franklin es un polinizador eficiente de cultivos hortofrutícolas colombianos como el tomate. Éste trabajo estableció tanto el comportamiento como la eficiencia de la polinización de <em>B. atratus </em>en el pimentón. Se ubicaron tres colonias en un cultivo de 1.500 m<sup>2</sup> ubicado en el municipio de Sáchica, Boyacá. Se caracterizó la fenología floral a partir del análisis morfométrico de estructuras reproductivas de la flor (largo de antera, filamento y estilo), receptividad del estigma y volumen de néctar. Adicionalmente se observó y cuantificó el comportamiento de forrajeo de las obreras a partir de observaciones directas y se estableció el efecto de la polinización en la calidad de los frutos (tamaño, peso seco del fruto y número de semillas), en tres estratos de la planta. Se determinaron tres estadios florales (Flor Abierta 1, 2 y 3) diferenciados por las variables tenidas en cuenta. Las obreras mostraron dos tipos de visita, cortas (12,34±5,77 segundos) y largas (82,8±11,14 segundos). Adicionalmente se observó una tendencia de las obreras en visitar el estadio Floral 2, en el que se presentó la mayor cantidad de néctar y la mayor receptividad del estigma. La polinización mediada por <em>B. atratus </em>tuvo un efecto en las variables evaluadas con un incremento mayor al 40%. </p>
Análisis de la producción de residuos sólidos y determinación de factores de producción en tres ciudades colombianas. Propuesta para una nueva metodología de medición
Authors: Turriago Hoyos Álvaro , Arrieta Bernate Geovanis 
Published: February 2016

Estudio de investigaciónLa Ley 142 expedida en 1944, establece la forma de medir los consumos de los productores de los residuos residenciales y no residenciales con el fin de cobrar los pagos por el servicio de recolección de residuos. Por lo tanto, la agencia gubernamental colombiana que atiende los asuntos relacionados con el agua y el manejo de los residuos sólidos (Comisión Reguladora de Agua y Residuos Sólidos, CRA) determinó por la Resolución 15 de 1997, unos factores de producción con el fin de establecer el nivel de este consumo, aplicando 0,12 toneladas o 120 kilos mensuales de residuos sólidos, con un factor de 1 para los usuarios de los estratos socioeconómicos 1, 2, 3 y 4 y para los usuarios de estratos 5 y 6, estos factores corresponden, respectivamente, a 1,48 y 1,66. El gobierno colombiano indicó la necesidad social de cambiar estos factores de producción debido a las cifras anticuadas utilizadas por la Resolución 15 y también por la heterogeneidad del usuario: residencial y no residencial, y dentro de cada uno de ellos, los diferentes estratos socioeconómicos y los diferentes sectores industriales. Este trabajo presenta los principales resultados de una consultoría contratada por la CRA con el fin de proponer una nueva clasificación y nuevos factores de producción basados en una investigación llevada a cabo en un conjunto de usuarios en tres ciudades colombianas. Al comienzo, se presenta una introducción a la cuestión de los residuos sólidos y se presentan algunos resultados en diferentes países con diferentes niveles de desarrollo.
Reseña Bibliografica
Authors: Uribe Uribe Luis Javier 
Published: February 2016

NUEVA HISTORIA ECONÓMICA DE COLOMBIA / SALOMÓN KALMANOVITZ, EDITOR. Con la colaboración de EDWIN LÓPEZ RIVERA, ENRIQUE LÓPEZ ENCISO, CARLOS BRANDO, CARLOS ALBERTO JAIMES, JOSÉ VIDAL CASTAÑO; TAURUS HISTORIA. 1ª Edición en Colombia, Marzo de 2010, 360 páginas. ISBN 978-958-704-940-4
Modelo de adherencia a la Política de Seguridad Institucional en una IPS de tercer nivel
Authors: Fandiño Juliana , Peláez María Mercedes , Peña Sara , Diana Rojas Diana Rojas 
Published: February 2016

Artículo de investigaciónEl presente trabajo tiene como objetivos describir la situación del servicio de Urgencias respecto a la adherencia del personal a la Política de Seguridad institucional y proponer un modelo que la facilite. Para evidenciar esta situación se utilizaron dos instrumentos: encuesta y lista de chequeo. Los resultados de la primera mostraron falta de conocimiento de la Política de todo el personal del servicio, inducción deficiente para médicos y técnicos de imagenología. Más de la mitad de los encuestados del personal de Urgencias cree que la institución es punitiva con respecto a los eventos adversos. En las listas de chequeo se encontró a nivel general muy baja adherencia al lavado de manos. Los médicos mostraron bajo cumplimiento en realizar los procedimientos de acuerdo con las normas de bioseguridad, en ordenar medidas de aislamiento y en dar recomendaciones al momento del egreso del paciente. Enfermería informó en un bajo porcentaje, al paciente y la familia, sobre el riesgo de caídas, no hizo uso de las normas de aislamiento y no tuvo en cuenta los diez correctos al aplicar medicamentos. El personal de Farmacia no verificó que la dosis de los medicamentos fuera coherente.Con esta información se concluyó que en el servicio se cumplen parcialmente las metas en cuanto a conocimiento y adherencia, lo cual evidencia la necesidad de plantear un modelo que ayude a los líderes del servicio a conseguir el cumplimiento de la Política de Seguridad
Persona e independencia
Authors: Gamboa Bernal Gilberto A. 
Published: February 2016

Artículo de reflexiónEl inicio de la celebración de nuestra independencia puede servir de marco para una reflexión que lleve a valorar el significado de tal hecho y la centralidad de la persona humana en ese proceso; pero también las consecuencias de asumir de manera adecuada un verdadero concepto de independencia que, antes que la reivindicación de derechos, debe apoyarse en la necesaria identificación y cumplimiento de deberes. La libertad que se conquista solo puede ser verdaderamente humana si no se desprende de la responsabilidad que implica. Ese binomio libertad y responsabilidad va seguido de otro: derechos y deberes. Pero el rumbo no está clausurado: la Ética y la Bioética pueden aportar muchos elementos claves para darle forma a una nueva cultura.