bluuebunny/crossref_metadata_2025_split huggingface dataset:
ANALISIS DEL DESARROLLO DE LA PRACTICA PEDAGOGICA CONSTRUCTIVISTA DEL CURSO DIMENSIONES DEL CONOCIMIENTO EN ENFERMERIA: UNA EXPERIENCIA DE AULA
Authors: Rojas Valenciano Ligia , Guzmán Aguilar Ana , Leiva Díaz Viriam 
Published: September 2014

Se presentan los resultados de un estudio que forma parte del proyecto de investigación No. 421-A8-113 titulado Los procesos educativos y evaluativos que conducen a la actualización del plan de estudios de Licenciatura en Enfermería, el cual concierne a la Escuela de Enfermería de la Universidad de Costa Rica. Fue aprobado por la Vicerrectoría de Investigación de la misma entidad educativa. (Vicerrectoria de Investigación oficio VI-1608-2008)Esta investigación se enmarca dentro de los fundamentos que establece la investigación acción en el aula. La población actuante fue aquella matriculada en el curso Dimensiones del Conocimiento en Enfermería, ubicado en el V ciclo del plan de estudios de la carrera de Licenciatura en Enfermería, la cual correspondió a 98 estudiantes; de los cuales se seleccionó una muestra intencional de 63 estudiantes que correspondió al 64% de la población. Para la recolección de información, se utilizó la técnica de cuestionario y la encuesta con preguntas generadoras, así como la observación participante por parte del docente y las notas de campo. Los datos obtenidos se confrontaron con la propuesta curricular del plan de estudios de la Escuela de Enfermería según resolución VD-6479-98. El estudio evidenció que las experiencias que se desarrollan en los cursos prácticos paralelos, fue fundamental para la construcción de nuevos conocimientos y la incorporación de este a nuevas estructuras cognitivas; además los y las docentes deben elaborar los materiales didácticos que se desarrollen a partir del contexto histórico, cultural, familiar y social del estudiantado para orientar los procesos de enseñanza y aprendizaje; finalmente, el tiempo (horario del curso), espacio físico (aulas) impidieron un desarrollo real de la evaluación formativa.
El uso de la silla maya durante el periodo expulsivo del parto y su relación con la menor incidencia de episiotomía o desgarros perineales
Authors: López Quirós Laura , Campos González Ana Ibis 
Published: September 2014

El objetivo de este trabajo es presentar los resultados de una pregunta clínica acerca del uso de la silla maya o silla obstétrica durante el periodo expulsivo en el parto y su relación con la menor incidencia de episiotomías y prevención de desgarros perineales. En las culturas tradicionales, las mujeres paren de forma natural en posiciones verticales como arrodilladas, paradas, entre otras, mientras que en las sociedades occidentales, los médicos han influido para que las mujeres tengan su parto en decúbito dorsal, algunas veces con las piernas levantadas con estribos, razón por la que para las mujeres de nuestro medio es difícil adoptar posiciones «alternativas» a las que tradicionalmente han visto como «normales». El uso de la silla maya o silla de parto en los países de América del Sur parece ser una manera efectiva para prevenir desgarros perineales y disminuir la incidencia de episiotomía durante el parto. Para llevar a cabo esta investigación secundaria se utilizó la metodología de práctica clínica basada en la evidencia que consta de cinco pasos. Se elaboró una pregunta en formato PICO (paciente, intervención, comparación y observación); posteriormente, se recabó información en bases de datos como Ebsco Host, Google académico, PubMed, Medline plus, Embase. Se encontraron 30 artículos, se analizaron según loscriterios que establece FLC, versión 2.0, de los cuales solamente uno se aproximó a responder a la preguntaclínica. Se expuso los datos en una presentación formal realizada por CIEBE-CR. Se concluye que no existe evidencia suficiente que el uso de la silla maya durante el periodo expulsivo reduzca considerablemente el riesgo de desgarro perianal y la menor incidencia de episiotomía durante el parto.
Tensor Two-loop Self-energy Integrals
Authors: Khiem Phan Hong , Son Do Hoang 
Published: September 2014

Based on the technique for evaluating tensor two-loop self-energy integrals in parallel and orthogonal spaces \cite{kreimer94}, we present a new UV subtraction procedure for a subset of integrals which contains overall UV-divergence. The numerical and analytical results of the sun-rise integral are discussed in comparison with other methods.
Effects of Electroporation on Biological Membranes Exposed to High Potentials
Authors: Nhung Nguyen Thi Thuy , Tung Le Thanh , Giang Nguyen Duc , Thanh Ngo Van , Viet Nguyen Ai 
Published: September 2014

This study first considers that voltages of cellular organelle membranes could significanly surpass these of plasma membranes under the influence of ultrashort and high-intensity electric pulse. This is due to the voltages induced on the membrane. Using an approximate theory coordinated with the Kotnik's analytical method, considering the electroporation, we focus on the reactions of cell membranes placed in a trapezoidal pulse. Then, we discuss conductive power dissipations of normal cell and cancer cell generated by a sinusoidal exposure which include dielectric relaxation effects. In comparison with the complex numerical calculations of Joshi \textit{et al}, our results are in very good agreement.
Study of Self-diffusion in GaAs Crystal: Temperature Dependence
Authors: Hung Vu Van , Hong Phan Thi Thanh , Hai Nguyen Thanh 
Published: September 2014

The self-diffusion of Ga and As atoms in GaAs crystal with the zince-blende structure (ZnS) is investigated by using the statistical moment method (SMM). The activation energy $(Q)$, diffusion coefficient $(D)$, and pre-exponential factor ($D_0$) are expressed by analytical closed expressions. The present analytical formulas are including the anharmonic effects of the lattice vibrations. The obtained results are applied to GaAs crystal and the SMM calculations of $Q, D$ and $D_0$ are in agreement with the experimental data.
Influence of Principle Parameters on the Average Stiffness of Optical Tweezer Using Pulsed Gaussian Beams
Authors: Quy Ho Quang , Hai Hoang Dinh , Nam Hoang Van 
Published: September 2014

In this article expresions used to simulate the trap stiffness k of the optical trap are derived. The influence of principle parameters as total energy, beam waist and duration of pulsed laser beam, radius of dielectric particle, and viscosity of surrounding medium on the stiffness is simulated and discussed.
Two Band Model for Diluted Magnetic Semiconductors: Study of the Ferromagnetic Transition Temperature
Authors: Thai Vu Kim , Tuan Hoang Anh 
Published: September 2014

The ferromagnetic transition temperature (Tc) of a two band model for diluted magnetic semiconductors (DMS) is calculated by using the coherent potential approximation (CPA). It is shown that Tc is strongly parameter dependent on density of the carriers, magnetic coupling constants, and the hopping terms. The maximal Tc of the two band model is found when both impurity bands fully overlap and this value is approximately twice larger than the highest Tc obtained in the single band model.
Electron Mobility in an Unintentionally Doped GaN/AlGaN Surface Quantum Well
Authors: Minh Nguyen Viet 
Published: September 2014

We present a theoretical study the two-dimensional electron gas 2DEG at low temperature in an unintentionally doped GaN/AlGaN surface quantum well, taking adequate account of the roughness-induced scattering mechansms and effect due to sheet polarization charges. Within model of surface quantum wells 2DEG be described by an extended Fang-Howard wave function, we are able to derive an analytic expression for the self-consistent Hartree potential. Thus, we obtained simple expresion describing the enhancement of the 2DEG screening and unscreened\break potentials for different scattering sources. We studied the electron mobility due to different scattering sources and the total electron mobility in an unintentionally doped GaN/AlGaN surface quantum well.
Phase structure of linear sigma model with neutrality constraint (II)
Authors: Phat Tran Huu , Thu Nguyen Van 
Published: September 2014

The phase structure of the linear sigma model with constituent quarks and the electric neutrality is systematically studied in the mean field theory. It results that in the chiral limit, as function of $T$ and chemical potential \\(\mu\\), the pion condensate undergoes a first-order phase transition. In the physical world, the phase diagram of chiral condensate exhibits a first-order phase transition, which ends at a critical end point (CEP) for $\alpha < 0.3$, where $\alpha$ is the fraction of $\pi^+$ contribution to the condensate.
Precision Frequency Measurement for He-Ne/ I<SUB>2</SUB> Laser Emission with kHz- Accuracy
Authors: Thang Le Huu , Thu Bui Quoc , Xuan Vu Khanh , Suh Ho Suhng , Hoi Pham Van 
Published: September 2014

An accurate and precise frequency measurement of S.I. unit traceability is essential not only in the field of frequency metrology but also in many fundamental scientific researches, because an accurate and precise frequency will be able to provide stable reference frequency related quantities like length and time -- the two important elements of physics. In this paper we present our frequency measurement for laser emission of the He-Ne/I2 laser system at the kHz accuracy and precision level. A frequency beat measurement of the laser under test with the standard frequency from a frequency optical comb is conducted. The second measurement method based on the heterodyne technique, where the beats between the hyperfine frequencies of 127I2 isotope at frequency of 474 THz and the testing He-Ne laser frequency recorded. The measurement data from different measurement techniques show a good consistency and therefore the given data are reliable.
The Influence of the Self-focusing Effect on the Optical Force Acting on Dielectric Particle Embedded in Kerr Medium
Authors: Nam Hoang Van , Le Cao Thanh , Quy Ho Quang 
Published: September 2014

The influence of the self-focusing effect arised from Kerr effect on the optical force acting on the dielecric particle embedded in the Kerr medium, which is irradiated by the Gaussian beam, is proposed to concern. The expressions of the optical forces with the nonlinear refractive index and nonlinear focal length are derived. Using them, the distribution of the optical forces in the trapping region of the optical tweezer is simulated and discussed for same distinguished case of the Kerr medium with different nonlinear coefficients. The results show that the stabe region of the optical tweezer depends on the nonlinear coefficient of refractive index. Moreover, the stable region could be brokendown with a critical value of the nonlinear coefficient of refractive index of the surrounding medium irradiated by Gaussian laser pulse described by given parameters as intensity, duration and radius of beam waist.
Influence of the Frequency-chirp on Pulse in Passively Mode-locking Optical Fiber Ring Laser
Authors: Kien Bui Xuan , Hung Tran Hai , Chien Trinh Dinh 
Published: September 2014

We consider a model of a passively mode-locking fiber ring laser bult using a saturable absorber and a chirped fiber Bragg grating to balance dispersion and nonlinearity. The evolution of the slowly envelope of the optical field in a loop fiber subject to dispersion , Kerr nonlinearity, frequency- chirp and nonlinear absorption is given by the generalized complex Ginzburg-Landau equation. The influence of the frequency-chirp on the pulse is simulated and discussed, and the stationary conditions concerning the chirp parameter are found out for our laser.
Lowest Excited-State Impurity Binding Energy in InGaN/GaN Parabolic QWW: Magnetic Field Effect
Authors: El Ghazi Haddou , Jorio Anouar , Zorkani Izeddine 
Published: September 2014

In this paper, we have investigated the magnetic field effect on the lowest excited-state binding energy of hydrogenic shallow-donor impurity in wurtzite (In,Ga)N/GaN parabolic transversal-section quantum-well wire (PQWW) using the finite-difference method within the quasi-one-dimensional effective potential model. The calculations are performed within the framework of the effective mass approximation. A cylindrical QWW effective radius is taken into account to describe the lateral confinement strength. The numerical results show that: (i) the probability density is the largest on a circularity whose radius is the effective radius and (ii) the lowest excited-state binding energy is the largest when an impurity is located on this circularity while it starts to decrease as the impurity is away from the circularity.
Re-examination of Two Zero Texture of Neutrino Mass Matrix After Neutrino-2012
Authors: Phong Nguyen Thanh 
Published: September 2014

We re-study the seven neutrino mass matrices with two independent vanishing entries under the latest results of neutrino oscillation experiments after the neutrino - 2012 conference. It is shown that the pattern B 1 could be excluded since this pattern realizes very small value of mixing angle theta13. The remain six textures satisfy the current experimental data. We also find that all seven textures of neutrino mass matrix possess the normal hierarchy of neutrino mass spectrum.
Vacuum Stability in Supersymmetric Reduced Minimal 3-3-1 Model
Authors: Thao Nguyen Huy , Phuong Ly Thi Mai , Hue Le Tho 
Published: September 2014

We investigate the vacuum stability conditions of theSupersymmetric reduced minimal 331 model (SUSYRM331) that createimportant consequences on Higgs mass spectrum as well assoft-parameters of the model. We prove that if this condition issatisfied then all Higgses are massive. Furthermore,soft-parameters should be in order of \(SU(3)_L\) scale. Based onthis, we investigate in detail masses of CP-even neutral anddoubly charged Higgses in the model. The neutral Higgs sectorincludes one light Higgs with mass at tree level \(m_{H^0_1}\simeq m_Z|\cos 2\gamma | < 92.0\) GeV and three other heavy Higgses. Fordoubly charged Higgses, there may exist a light Higgs which can beobserved by recent colliders such as LHC.
Influence of Spin Fluctuation on the Magnetic Properties of EuO Ultra-thin Film
Authors: Thao Pham Huong , Cong Bach Thanh 
Published: September 2014

The Gaussian spin fluctuation theory is applied to study magnetic properties (Curie temperature, magnetization) of EuO ultra-thin films within nearest neighbor and next nearest neighbor exchange approximation. The dependence of Curie temperature on the thickness of the free EuO ultrathin film is calculated and compared with the results of the other mean field method- constant coupling approximation. The effect of nearly independence of saturation magnetization on the EuO films thickness measured in [8] can be explained by controlling the next nearest neighbor exchange in presence of substrates.
Influence of Annealing Conditions on Structure and Critical Parameters of Ni50Mn37Sn13 Magnetocaloric Material
Authors: Dan Nguyen Huy , An Nguyen Manh 
Published: September 2014

In this paper, we present the influence of annealing conditions on structure and magnetic behavior of Ni\(_{50}\)Mn\(_{37}\)Sn\(_{13}\) magnetocaloric alloy prepared by arc-melting technique. The results show that the almost single phase of the full Heusler structure of Ni\(_{2}\)MnSn could be achieved by appropriate annealing. The transformation between martensite and austenite phases, and multi-magnetic phase behavior are observed more clearly with higher fraction of Ni\(_{2}\)MnSn phase. By using Arrott-Noaks method, critical parameters were determined to be \(\beta 0.464 \pm 0.021\), \(\gamma = 1.117 \pm 0.073\) and \(\delta = 3.41\), which lay between mean-field model (\(\beta = 0.5\) and \(\gamma = 1\), \(\delta = 3\)) with long-range ferromagnetic orders and 3D Heisenberg model (\(\beta = 0.365\), \(\gamma = 1.336\), \(\delta {\rm g}= 4.66\)) with short-range ferromagnetic orders. The calculated results are in good accordance with the experimentally observed coexistence of weak-ferromagnetic martensite and strong-ferromagnetic austenite phases.
Influence of Blocking Effect and Energetic Disorder on Diffusion in One-dimensional Lattice
Authors: Lan Mai Thị , Hong Nguyen Van , Nhan Nguyen Thu , Hue Hoang Van 
Published: September 2014

The diffusion in one-dimensional disordered lattice with Gaussian distribution of site and transition energies has been studied by mean of kinetic Monte-Carlo simulation. We focus on investigating the influence of energetic disorders and diffusive particle density on diffusivity. In single-particle case, we used both analytical method and kinetic Monte-Carlo simulation to calculate the quantities that relate to diffusive behavior in disordered systems such as the mean time between two consecutive jumps, correlation factor and diffusion coefficient. The calculation shows a good agreement between analytical and simulation results for all disordered lattice types. In many-particle case, the blocking effect results in decreasing correlation factor F and average time \(\tau _{jump}\) between two consecutive jumps. With increasing the number of particles, the diffusion coefficient \(D_{M}\) decreases for site-energy and transition-energy disordered lattices due to the F-effect affects stronger than \(\tau\)-effect. Furthermore, the blocking effect almost is temperature independent for both lattices.
Thermodynamic Properties of Free Standing Thin Metal films Investigated Using Statistical Moment Method: Temperature and Pressure Dependence
Authors: Hung Vu Van , Phuong Duong Dai , Hoa Nguyen Thi 
Published: September 2014

The moment method in statistical dynamics \textit{(SMM)} is used to study thermodynamic properties of free standing thin metal films with face-centered cubic structure (fcc) taking into account the anharmonicity effects of the lattice vibrations and hydrostatic pressures. The explicit expressions of the lattice constant, thermal expansion coefficient, and specific heats at the constant volume and those at the constant pressure, \(C_V\) and \(C_P\) of the metal thin films are derived in closed analytic forms in terms of the power moments of the atomic displacements. The thermodynamic quantities of Au, Ag, Cu and Al metal thin films are calculated as a function of the temperature and pressure, and they are in good agreement with the corresponding results obtained from other theoretical calculations and experimental values. The effective pair potentials work well for the calculations of fcc metal thin films.
Temperature dependent magnetization of the two band model for diluted magnetic semiconductors
Authors: Thai Vu Kim , Tuan Hoang Anh 
Published: September 2014

The temperature dependent magnetization of a two band model for diluted magnetic semiconductors as a function of magnetic coupling constant, hopping parameters and carrier densities is calculated by using the coherent potential approximation. It is shown that the degree of overlapping of the impurity bands and carrier density are crucial parameters determining the magnetization behavior of the system.
Intravesical instillation of amikacin for treatment of a lower urinary tract infection caused by Pseudomonas aeruginosa in a dog
Authors: Torres Ahmira R. , Cooke Kirsten 
Published: September 2014

Abstract
Case Description—A 9-year-old neutered male Golden Retriever was evaluated because of recurrent lower urinary tract infection subsequent to placement of a permanent cystostomy tube.
Clinical Findings—The dog was clinically normal except for the presence of malodorous urine. Bacteriologic culture of a urine sample obtained by cystocentesis yielded growth of Pseudomonas aeruginosa, which was susceptible to amikacin, gentamicin, imipenemcilastatin, and ticarcillin–clavulanic acid.
Treatment and Outcome—The dog was administered amikacin sulfate (15 mg/kg [6.8 mg/lb], SC, q 24 h) for 14 days before treatment was discontinued because of the presence of casts in the urine. The cystostomy tube was replaced, and intravesical instillation of amikacin (15 mg/kg diluted in 30 mL of saline [0.9% NaCl] solution, q 12 h) was initiated. On day 25 of instillation treatment, bacterial culture of a urine sample yielded no growth, urinalysis revealed no casts, and SUN and creatinine concentrations were within reference intervals. On day 27 of instillation treatment, gross hematuria was observed, which resolved following discontinuation of amikacin instillation.
Clinical Relevance—In this dog, treatment of a lower urinary tract infection caused by a multidrug-resistant strain of P aeruginosa was successfully achieved with intravesical instillation of amikacin. Results of serial serum biochemical analyses remained within reference limits, and urine casts were not identified on urinalyses during the treatment period, which suggested that systemic absorption of amikacin was minimal. Intravesical instillation of antimicrobials may be a viable treatment option for dogs with lower urinary tract infections caused by multidrug-resistant bacteria.
Angiostrongylus cantonensis infection in captive Geoffroy's tamarins (Saguinus geoffroyi)
Authors: Kottwitz Jack J. , Perry Kaylee K. , Rose Heidi H. , Hendrix Charles M. 
Published: September 2014

Abstract
Case Description—3 Geoffroy's tamarins (Saguinus geoffroyi) in a zoo in east central Alabama developed neurologic signs shortly after a tamarin kept in the same enclosure was found dead.
Clinical Findings—Neurologic abnormalities varied among animals and were progressive. One female tamarin with a head tilt, nystagmus, mild ataxia, and paresis of a thoracic limb had gram-positive cocci present in an ear canal with otitis media and interna suspected. Another female with mild ataxia attributed to previous tail amputation developed seizures, and a male tamarin with tail tip trauma also developed ataxia.
Treatment and Outcome—The tamarin with suspected otitis received cephalexin and prednisolone, but neurologic signs worsened, and the patient died. Preliminary examination of necropsy samples revealed severe meningoencephalitis in both deceased tamarins. Prednisolone and phenobarbital treatment was initiated for the tamarin with seizures, but rapid neurologic deterioration led to euthanasia. Further histologic examination of the 3 deceased tamarins revealed meningitis and acute perivascular hemorrhage in the meninges. Parasites morphologically consistent with Angiostrongylus (Parastrongylus) cantonensis were present in the lungs of 1 animal and in the meninges of 2. The surviving tamarin received cephalexin for tail tip trauma and prednisolone and albendazole for presumed meningoencephalitis and parasitic infection but had permanent neurologic deficits.
Clinical Relevance—To our knowledge, these represent the first cases of A cantonensis infection in Geoffroy's tamarins and the first report of its presence in the United States not associated with a major shipping port. The presence of a mature worm in the lungs of 1 tamarin suggested completion of the parasite life cycle, previously reported only in rats.