bluuebunny/crossref_metadata_2025_split huggingface dataset:
Planificación centrada en investigación y aprendizaje escolar
Authors: Burgos Briones José Galdino , Vélez Zambrano Gina Verónica , Pico Barreiro Leopoldo José 
Published: October 2019

La investigación tuvo como propósito comprobar o desechar las siguientes hipótesis de estudio. El tipo de investigación fue aplicativa, apoyada en un diseño cuasi experimental, lo cual permitió comprobar o desechar las hipótesis de investigación. La prueba T de Student permite identificar variación significativa de ,160 en el grupo experimental en el momento postprueba, lo cual permite deducir que el programa aplicado resultó eficaz, aceptándose la hipótesis afirmativa y desechándose la alternativa. Al adoptarse el enfoque de planificación centrado en la investigación, se articula la posibilidad de construir comunidades de aprendizaje, sustentadas desde la investigación, promoviéndose la creativa e innovación como parte natural del aprendizaje, contribuyéndose en generar desde la educación básica, estudiantes basados en una ciudadana responsable para el abordaje de los problemas mediante la investigación.
Epistemología y su vigencia en el quehacer investigativo universitario
Authors: Álava Zambrano María Rosario , Quijije Moreira Pedro Vicente , Álava Zambrano José Rafael 
Published: October 2019

El artículo de revisión tiene por esencia un análisis sobre la epistemología y su vigencia en el quehacer investigativo universitario, se conciben diversas concepciones que permiten el abordaje de la investigación en las universidades, posibilitando el encuentro del investigador con el objeto – sujeto – fenómeno investigado, en función del abordaje epistemológico – metodológico, el objeto concuerda con la concepción heredada, el sujeto con la reflexión libre, el fenómeno desde la introspección de Ricci, así se condicionan los procesos investigativos para configurar un accionar concomitante de reflexión y de acción por parte del investigador. La epistemología se encuentra vigente como estructura coherente de los procesos investigativos en las universidades, sin embargo, se enfrenta al reto de redescubrir la esencia de lo que es investigar, porqué y paraqué se investiga en las universidades, cuales son las finalidades últimas que permiten ejecutar investigaciones con pertinencia al crecimiento integral de la sociedad.
Non-Maxwellian Velocity Distribution Functions for Coulombic Systems Out of Equilibrium
Authors: Randol Brent M. 
Published: October 2019

Abstract
The velocity distribution function (VDF) of ions in the solar wind, as observed by spacecraft at 1 au and elsewhere in the heliosphere, exhibits a consistent trend: at low energies in the solar wind frame, the distribution is largely Maxwellian—the core; at higher but still modest energies in the solar wind frame, the distribution follows a power law (f ∝ v
−γ
, where f is the VDF, v is the speed in the solar wind frame, and γ is an arbitrary spectral index parameter)—the tail—with a spectral index of γ ≈ 5 being extremely common. Several theories have been proposed to explain this common index. Among these theories is that the tail is a natural consequence of an ensemble of particles obeying Coulomb’s law. In this study, we derive a general analytical formula for the distribution of electric fields, and find that it always exhibits a power-law tail with a spectral index of exactly 9/2, or 4.5, due to the spatial power-law index of Coulomb’s law. We then show how the VDF is a convolution of the distribution of electric fields with a preexisting VDF, and that for small values of time after being created, the ion VDF always exhibits a γ = 9/2 power law, wherein the probability of the tail relative to the core depends on particle density, n, and inversely on the preexisting VDF thermal speed, v
th. Finally, we compare our results with previous works, and find good agreement but with important distinctions.
Modeling Time Dependent Water Chemistry Due to Powerful X-Ray Flares from T-Tauri Stars
Authors: Waggoner Abygail R. , Cleeves L. Ilsedore 
Published: October 2019

Abstract
Young stars emit strong flares of X-ray radiation that penetrate the surface layers of their associated protoplanetary disks. It is still an open question as to whether flares create significant changes in disk chemical composition. We present models of the time-evolving chemistry of gas-phase H2O during X-ray flaring events. The chemistry is modeled at point locations in the disk between 1 and 50 au at vertical heights ranging from the midplane to the surface. We find that strong, rare flares, i.e., those that increase the unattenuated X-ray ionization rate by a factor of 100 every few years, can temporarily increase the gas-phase H2O abundance relative to H by more than a factor of ∼3–5 along the disk surface (Z/R ≥ 0.3). We report that a “typical” flare, i.e., those that increase the unattenuated X-ray ionization rate by a factor of a few every few weeks, will not lead to significant, observable changes. Dissociative recombination of H3O+, H2O adsorption and desorption onto dust grains, and ultraviolet photolysis of H2O and related species are found to be the three dominant processes regulating the gas-phase H2O abundance. While the changes are found to be significant, we find that the effect on gas-phase water abundances throughout the disk is short-lived (days). Even though we do not see a substantial increase in long-term water (gas and ice) production, the flares’ large effects may be detectable as time-varying inner disk water “bursts” at radii between 5 and 30 au with future far-infrared observations.
Predicting Granulation “Flicker” and Radial Velocity “Jitter” from Spectroscopic Observables
Authors: Tayar Jamie , Stassun Keivan G. , Corsaro Enrico 
Published: October 2019

Abstract
Surface granulation can be predicted with the mass, metallicity, and frequency of maximum oscillation power of a star. Using the orders-of-magnitude larger Apache Point Observatory Galaxy Evolution Experiment-Kepler (APOGEE-Kepler) sample, we recalibrate the relationship fit by Corsaro et al. for “flicker,” an easier-to-compute diagnostic of this granulation. We find that the relationship between the stellar parameters and flicker is significantly different for dwarf and subgiant stars than it is for red giants. We also confirm a dependence of flicker amplitude on metallicity as seen originally by Corsaro et al., although the dependence found here is somewhat weaker. Using the same APOGEE-Kepler sample, we demonstrate that spectroscopic measurements alone provide sufficient information to estimate the flicker amplitude to 7% for giants, and 20% for dwarfs and subgiants. We provide a relationship that depends on effective temperature, surface gravity, and metallicity, and calculate predicted flicker values for 129,000 stars with APOGEE spectra. Finally, we use published relationships between flicker and radial velocity jitter to estimate minimum jitter values for these same 129,000 stars, and we identify stars whose total jitter is likely to be even larger than the granulation-driven jitter by virtue of large-amplitude photometric variability.
SOTE: A Nonlinear Method for Magnetic Topology Reconstruction in Space Plasmas
Authors: Liu Y. Y. , Fu H. S. , Olshevsky V. , Pontin D. I. , Liu C. M. , Wang Z. , Chen G. , Dai L. , Retino A. 
Published: October 2019

Abstract
Complex magnetic structures are ubiquitous in turbulent astrophysical plasmas. Such structures can be host to many dynamic processes, such as magnetic reconnection and energy dissipation. Thus, revealing the 3D topologies of these structures is necessary. In this study, we propose a new method to reconstruct complex magnetic topologies in quasi-steady space plasmas, by utilizing eight-point measurements of magnetic fields and particles. Such a method, based on the Second-Order Taylor Expansion (SOTE) of a magnetic field, is nonlinear; it is constrained by

and

, where

is from particle moments. A benchmark test of this method, using the simulation data, shows that the method can give accurate reconstruction results within an area about three times the size of a spacecraft tetrahedron. By comparing to the previous First-Order Taylor Expansion (FOTE) method, this method (SOTE) gives similar results for reconstructing quasilinear structures but exhibits better accuracy in reconstructing nonlinear structures. Such a method will be useful to the multi-scale missions, such as the future European Space Agency's “cross-scale” mission and China's “self-adaptive” mission. Also, it can be applied to four-point missions, such as Cluster and the Magnetospheric Multiscale Mission. We demonstrated how to apply this method to the four-point missions. In principle, this method will be useful to study shocks, magnetic holes, dipolarization fronts, and other nonlinear structures in space plasmas.
Valeur(s) & management
Authors: Engel Alexandre 
Published: October 2019

Henry Ford disait « Se réunir est un début. Rester ensemble est un progrès. Travailler ensemble est la réussite. ». L’apport du Lean Six Sigma dans une entreprise n’est plus à démontrer. En effet, cette méthode ou culture a permis de valoriser significativement, aussi bien en efficience qu’en efficacité, les chaînes de valeur des entreprises aussi bien dans le domaine de l’industrie, avec Toyota comme référence, que dans les sociétés de service (banque, assurance …). Ces processus ou chaînes de valeur de l’entreprise sont managés du point de vue leadership (équipe) et organisation (fonctionnement). Ces éléments primordiaux font partie intégrante à la démarche Lean Six Sigma. Le Lean Six Sigma est un tout qui apporte de la valeur à l’entreprise aussi bien sur le plan humain que sur le plan organisation/managérial. C’est un système ou démarche qui pousse/tire l’entreprise à évoluer perpétuellement en qualité et efficacité.
Valeur(s) & management
Authors: des Mesnards Paul-Hubert 
Published: October 2019

L’analyse de la valeur se définit comme une démarche collaborative, organisée et méthodique, permettant de créer ou de faire évoluer un produit (ou un service) afin de répondre au mieux aux besoins de ses utilisateurs tout en optimisant l’emploi des ressources nécessaires. Ce rapport entre la satisfaction des besoins et l’emploi des ressources est justement la Valeur. Plus précisément, l’analyse de la valeur, c’est : • exprimer les besoins au strict nécessaire, en éliminant le superflu, en raisonnant fonctions et non solutions ; • élaborer la réponse aux besoins en éliminant tout ce qui n’apporte pas de la valeur ajoutée à l’utilisateur ; • et ce en travaillant en équipe multidisciplinaire en se posant en même temps les bonnes questions dans le cadre d’une démarche structurée : – le « quoi » avant le « comment » ; – et le « pour quoi » avant le « quoi ».
Valeur(s) & management
Authors: Froment Éric 
Published: October 2019

L’économie de fonctionnalité a désormais ses lettres de noblesse car elle est inscrite dans notre quotidien, mais chacun en fait sans le savoir ! Dans chaque cas constaté, elle est un relais de croissance. Elle est typiquement un des modèles économiques les plus adaptés (sinon le plus) au changement de cycle macroéconomique que nous vivons. Il est important de préciser, dès le début de ce chapitre, que l’économie de fonctionnalité est un modèle économique. C’est bien plus large qu’une stratégie marketing ou un modèle d’affaires (business model). C’est pourquoi les différents cas connus peuvent être très différents tout en respectant les principes fondamentaux du modèle. C’est ce qui fait sa richesse, son adaptabilité à presque tous les secteurs, couples produits-marchés. Il est tout aussi important de préciser qu’elle est une innovation organisationnelle de rupture. Pour cette raison, elle est bien plus facile et rapide à mettre en place qu’une innovation technologique de rupture, dont les délais et les coûts sont très difficiles à maîtriser.
OPECST et le nucléaire :
Authors: Parotte Céline 
Published: October 2019

Quel rôle l’OPECST a - t- il joué dans le programme de gestion des déchets hautement radioactifs en France ? Comparativement à ses homologues européens, l’Office Parlementaire de Technology Assessment (TA) fait figure d’exception dans ce domaine : il n’a cessé, depuis 27 ans, d’évaluer, de critiquer et d’influencer ce dossier sensible.
The Role of Kupffer Cells as Mediators of Adipose Tissue Lipolysis
Authors: Ma Weide , Zhao Dianyuan , He Fuchu , Tang Li 
Published: October 2019

Abstract
Kupffer cells (KCs) are the resident macrophages of the liver, and they respond to and counteract metabolic stresses, such as those imposed by high-fat diet feeding in mouse models. However, little is known regarding the role of these cells in maintaining metabolic homeostasis under metabolically normal conditions. In this study, we found that depletion of KCs in vivo led to enhanced lipolysis in adipose tissue by increasing the expression of FGF21, a metabolic regulator, in hepatocytes. IL-1β secreted from KCs contributed to the suppression of FGF21 expression in hepatocytes. FGF21 overexpression led to a lean phenotype and enhanced lipolysis in mice. KC depletion resulted in a lack of IL-1β signaling in the liver, leading to elevated expression of FGF21 in hepatocytes. FGF21 promoted lipolysis in adipose tissue and led to hyperlipidemia and decreased body weight. The secretion of IL-1β in KCs was mediated by bacterial products. Antibiotic treatment also led to enhanced lipolysis. Therefore, the current study identified a physiological role of KCs in the regulation of adipose lipolysis.
Relationship Between the King-Devick Test and Commonly Used Concussion Tests at Baseline
Authors: Clugston James R. , Houck Zachary M. , Asken Breton M. , Boone Jonathan K. , Kontos Anthony P. , Buckley Thomas A. , Schmidt Julianne D. , Chrisman Sara P. D. , Hoffman Nicole L. , Harmon Kimberly G. , Kaminski Thomas W. , Collins Michael W. , McAllister Thomas W. , McCrea Michael A. , Broglio Steven P. , Ortega Justus D. 
Published: October 2019

ContextComprehensive assessments are recommended to evaluate sport-related concussion (SRC). The degree to which the King-Devick (KD) test adds novel information to an SRC evaluation is unknown.ObjectiveTo describe relationships at baseline among the KD and other SRC assessments and explore whether the KD provides unique information to a multimodal baseline concussion assessment.DesignCross-sectional study.SettingFive National Collegiate Athletic Association institutions participating in the Concussion Assessment, Research and Education (CARE) Consortium.Patients or Other ParticipantsNational Collegiate Athletic Association student-athletes (N = 2258, age = 20 ± 1.5 years, 53.0% male, 68.9% white) in 11 men's and 13 women's sports.Main Outcome Measure(s)Participants completed baseline assessments on the KD and (1) the Symptom Inventory of the Sport Concussion Assessment Tool–3rd edition, (2) the Brief Symptom Inventory-18, (3) the Balance Error Scoring System, (4) the Standardized Assessment of Concussion (SAC), (5) the Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT) test battery, and (6) the Vestibular/Ocular Motor Screening tool during their first year in CARE. Correlation coefficients between the KD and the 6 other concussion assessments in isolation were determined. Assessments with ρ magnitude &gt;0.1 were included in a multivariate linear regression analysis to evaluate their relative association with the KD.ResultsScores for SAC concentration, ImPACT visual motor speed, and ImPACT reaction time were correlated with the KD (ρ = −0.216, −0.276, and 0.164, respectively) and were thus included in the regression model, which explained 16.8% of the variance in baseline KD time (P &lt; .001, Cohen f2 = 0.20). Better SAC concentration score (β = −.174, P &lt; .001), ImPACT visual motor speed (β = −.205, P &lt; .001), and ImPACT reaction time (β = .056, P = .020) were associated with faster baseline KD performance, but the effect sizes were small.ConclusionsBetter performance on cognitive measures involving concentration, visual motor speed, and reaction time was weakly associated with better baseline KD performance. Symptoms, psychological distress, balance, and vestibular-oculomotor provocation were unrelated to KD performance at baseline. The findings indicate limited overlap at baseline among the CARE SRC assessments and the KD.
Expansions of the Real Field by Canonical Products
Authors: Miller Chris , Speissegger Patrick 
Published: October 2019

AbstractWe consider expansions of o-minimal structures on the real field by collections of restrictions to the positive real line of the canonical Weierstrass products associated with sequences such as$(-n^{s})_{n>0}$(for$s>0$) and$(-s^{n})_{n>0}$(for$s>1$), and also expansions by associated functions such as logarithmic derivatives. There are only three possible outcomes known so far: (i) the expansion is o-minimal (that is, definable sets have only finitely many connected components); (ii) every Borel subset of each$\mathbb{R}^{n}$is definable; (iii) the expansion is interdefinable with a structure of the form$(\mathfrak{R}^{\prime },\unicode[STIX]{x1D6FC}^{\mathbb{Z}})$where$\unicode[STIX]{x1D6FC}>1$,$\unicode[STIX]{x1D6FC}^{\mathbb{Z}}$is the set of all integer powers of$\unicode[STIX]{x1D6FC}$, and$\mathfrak{R}^{\prime }$is o-minimal and defines no irrational power functions.
Fires Were Started –
Authors: Winston Brian 
Published: October 2019

Humphrey Jennings (1907-50) was perhaps the most gifted film-maker of the British documentary movement. Involved in the Mass Observation project of the 1930s, Jennings' talent lay in picturing ordinary life in ways that were inventive yet authentic. "Fires Were Started –" (1943) is his major achievement. A film about a day's work for a unit of mainly auxiliary volunteer firemen at the height of the blitz, it blends observation with reconstruction to achieve a particularly poignant kind of propaganda.
Lindsay Anderson expressed the opinion of many commentators and viewers when he wrote in Sight and Sound (in a 1954 article reprinted as an appendix to this volume) that Jennings was 'the only real poet the British cinema has yet produced'. But how could a documentarist also be a 'poet'?
This is one of the questions addressed by Brian Winston in his study of "Fires Were Started –", a question which is particularly relevant today in the wake of the massive public controversies surrounding 'faked' documentaries. For Winston documentary film-making is always 'creatively treated actuality' and must be taken as such if it's to be properly valued and understood.
Comparación del tratamiento conservador y quirúrgico en la rotura aguda del tendón de Aquiles
Authors: Carrera Sánchez María 
Published: October 2019

El objetivo de esta revisión fue comparar el tratamiento quirúrgico y el tratamiento conservador para ver cuál era más eficaz ante la nueva rotura. Hubo resultados contradictorios. La pieza clave parece ser el protocolo de rehabilitación posterior a la intervención.
Se realizó una búsqueda en bases de datos (Pubmed, Cochrane y PEDro) para encontrar artículos que comparasen ambos tratamientos. Se hizo criba de los mismos según los criterios de inclusión y exclusión.
Encontramos que los estudios que no usan un protocolo de rehabilitación con carga temprana tuvieron un resultado a favor del tratamiento quirúrgico para evitar la recidiva (P=0,002). En cambio, los estudios que sí usaron este protocolo no encontraron tanta diferencia de nueva rotura entre el tratamiento conservador y el quirúrgico (P=0,05). Se vio que el tratamiento quirúrgico sí está relacionado con el aumento de las complicaciones (P=0,004).
En conclusión, el tratamiento quirúrgico está relacionado con una menor tasa de nueva rotura, a no ser que haya un protocolo de rehabilitación con carga temprana. En este caso, la tasa de recidiva sería similar para ambos tratamientos, siempre teniendo en cuenta que la cirugía abierta está relacionada con más complicaciones.
Estudios experimentales de la biomecánica de la marcha durante el embarazo: revisión sistemática de ensayos clínicos. (2000-2018)
Authors: Martínez Jiménez Eva María , Díaz Velázquez José  Ignacio , Sánchez Gómez Rubén , Santiago Nuño Fernando , Casado Hernández Israel , Garrido Castells Xavier 
Published: October 2019

Background: El embarazo es un momento en la vida de la mujer cuyos cambios fisiológicos, hormonales, y morfológicos generan grandes cambios corporales. Estos cambios se producen en un periodo de tiempo muy corto y provocan una pérdida de estabilidad y de cambios cinemáticos y cinéticos en su marcha que generan caídas y molestias musculoesqueléticas en el miembro inferior y pie.
Métodos: Se ha realizado una revisión de la literatura científica para identificar los posibles estudios científicos sobre la marcha y embarazo. Se han consultado los principales buscadores y bases de datos biomédicas: Medline-pubmed, Enfispo, Scielo y Science Direct®. El periodo de búsqueda estuvo comprendido febrero-junio de 2018.
Resultados: En nuestra búsqueda hallamos 912 resúmenes de artículos con las palabras clave seleccionadas. 892 artículos de los anteriormente mencionados fueron excluidos tras leerlos por no cumplir los criterios de selección del estudio. Por lo tanto, obtuvimos 20 relevantes.
Conclusión: Existen estudios experimentales que evidencian cambios en la cinemática, cinética de la marcha del tronco, pelvis, miembro inferior y pie en el embarazo y postparto.
La temperatura del pie como factor predictivo de aparición de úlceras en la Diabetes Mellitus
Authors: García De La Peña Raquel , Benhamú Benhamú Salomón , Jiménez Cristino María Dolores , Grande del Arco Jéssica , Gijón Noguerón Gabriel 
Published: October 2019

El Pie Diabético es una de las complicaciones más importantes de la Diabetes Mellitus debido a la posibilidad que existe de sufrir una úlcera plantar que aboque a una amputación.
La neuropatía periférica diabética acontece en un 60-70 % de los sujetos con Diabetes Mellitus y se caracteriza por un trastorno de la sensibilidad táctil y dolorosa, la alteración del umbral de vibración y de la percepción térmica para los umbrales de temperatura al calor y al frío.
La temperatura de los pies de los sujetos con Diabetes Mellitus sin neuropatía periférica diabética es menor que con presencia de neuropatía periférica diabética. Se produce una correlación entre el aumento de la temperatura y la aparición de lesiones en los pies, debido a que la temperatura aumenta en las zonas de riesgo de ulceración por la propia inflamación y a la autolisis enzimática de los tejidos, previa a la aparición de una ulceración de la artropatía de Charcot.
RESULTADOS: Actualmente se emplean dos tipos de técnicas de medición de la temperatura: termografía y termometría. Las pruebas de termografía se clasifican en placas superpuestas de cristal líquido termosensible e infrarrojos, y las pruebas de termometría se dividen en infrarrojos y los sensores térmicos.
La valoración térmica se debe incluir en los protocolos de exploración neurológica de los pies en la Diabetes Mellitus por ser una prueba eficaz, no invasiva y disminuye la tasa de aparición de úlceras.
CONCLUSIONES: Se considera que una diferencia de 2,2º C, en el mismo punto de ambos pues de un sujeto, indica la aparición de lesiones propias del Pie Diabético, bien una ulceración si hay lesión, o una artropatía de Charcot.
La evidencia científica indica que el control de la temperatura de los pies disminuye la tasa de ulceraciones en la Diabetes Mellitus. Abogamos por la inclusión de la valoración térmica en el protocolo de exploración de los sujetos con Diabetes Mellitus, debido a su efectividad en la prevención de ulceraciones y por su escaso tiempo de cribado.