bluuebunny/crossref_metadata_2025 huggingface dataset:
Формирование нанопористых пленок силицидов меди
Authors: Бучин Э.Ю. , Наумов В.В. , Васильев С.В.
Published: February 2019

AbstractThe possibility of forming nanoporous copper-silicide films with different phase compositions is experimentally demonstrated. For this purpose, the parameters of the initial a -Si/Cu structure and the conditions of its annealing are chosen so that the process of solid-phase synthesis comes to a halt at the stage of formation of a branched silicide cluster. Then the films are subjected to liquid etching in a mixture of diluted inorganic acids. In this case, the metastable Cu_ x Si phase with a low Cu content is selectively removed, and a three-dimensional silicide cluster is released. At the same time, surface Kirkendall voids present in the films open. As a result of these two processes in combination, a nanoporous structure is formed.
Тонкая структура импедансных спектров кристаллов с пьезоэлектрическим эффектом
Authors: Гоффман В.Г. , Компан М.Е. , Гороховский А.В. , Горшков Н.В. , Байняшев А.В. , Телегина О.С. , Воронкова В.И. , Антонов И.Н. , Агапова Ю.В.
Published: February 2019

AbstractThe manifestation of piezoelectric resonances in high-resolution impedance spectra was found and interpreted using the example of KDP crystal. A resonance signal inversion was observed in LiIO_3 crystals, having significant ion conductivity.
Влияние толщины слоев гадолиния на магнитные свойства и процессы перемагничивания низкоразмерных Co/Gd/Co-систем
Authors: Харламова А.М. , Свалов А.В. , Лепаловский В.Н. , Шалыгина Е.Е.
Published: February 2019

AbstractStructural and magnetic characteristics and behavior of thin-film Co/Gd/Co systems obtained by ion plasma sputtering in a magnetic field are reported. X-ray studies showed that cobalt layers in all investigated samples have a nanocrystalline structure. The mean roughness R a of the surface of the samples does not exceed 0.5 nm and is independent of the Gd layer thickness. The shape of hysteresis loops observed for the Co/Gd/Co system depends of the thickness of the Gd layer, t _Gd. The dependence of the saturation field H _S on t _Gd has an oscillatory character. This fact is explained by interaction of the Co layers through the intermediate Gd layer.
Асимметричность колебаний доменных границ в гармоническом и импульсном магнитных полях в кристаллах ферритов-гранатов с дрейфом полосовой доменной структуры
Authors: Памятных Л.А. , Мехоношин Д.С. , Памятных С.Е. , Агафонов Л.Ю. , Лысов М.С. , Шматов Г.А.
Published: February 2019

AbstractAn asymmetric displacement of domain walls during their oscillatory motion and an asynchronous change in the velocities of neighboring domain walls have been revealed in iron garnet crystals with different characters of magnetic anisotropy in an alternating harmonic magnetic field at field amplitudes lower than the field initiating the drift motion of the domain structure. It has been established that in a bipolar pulsed magnetic field the displacement of domain walls in the direction of drift exceeds the displacement of domain walls in the direction opposite to drift. A theoretical model in which asymmetry in the oscillations of domain walls and drift appear due to anisotropy in the attenuation parameter is proposed.
Тепловые флуктуации и резонансные свойства сканирующих зондов на основе углеродных нанотрубок
Authors: Чалин Д.В. , Авраменко М.В.
Published: February 2019

AbstractThe design of cantilevers and microelectromechanical systems based on carbon nanotubes necessitates a thorough study of their thermal fluctuations and resonance properties. This work aims at the simulation of thermal fluctuations and power spectral density for single-walled carbon nanotubes in the context of the continuous model of elastic cylindrical membranes with nonmacroscopic thicknesses. The conditions imposed on the geometry of this probe and providing its stable operation, as well as the high lateral resolution determined by only the radius of the nanotube independently on its thermal vibrations, are found, as well. The most intensive resonance modes, making the greatest contribution to the thermal fluctuations of carbon nanotubes, are established, and their frequencies are found analytically.
Кинетика излучения поверхностных (би) экситонов в тонких пленках ZnO
Authors: Акопян И.Х. , Лабзовская М.Э. , Новиков Б.В. , Talalaev V.G. , Tomm J.W. , Schilling J.
Published: February 2019

AbstractThe kinetics of near-edge photoluminescence (PL) in ZnO nanofilms prepared by the atomic layer deposition has been investigated. It is established that the kinetics of near-edge PL in 4-nm films is determined to a great extent by surface 2D-exciton (SX) and biexciton (SXX) complexes. The contribution from surface biexcitons is estimated based on a photostimulated change in the surface potential in ZnO films with different thicknesses. Ultrafast dynamics of surface biexcitons in thin films are revealed. It is shown that biexcitons localized near the surface have the shortest radiative lifetime (less than 100 ps) among all bound exciton complexes, which is explained by the large oscillator strength.
Линейные и нелинейные магнитооптические явления в эпитаксиальных плeнках халькогенидов европия EuX (X=O, Se, Te)
Authors: Павлов В.В.
Published: February 2019

AbstractThe studies of magneto-optical effects in epitaxial films of magnetic semiconductors—europium chalcogenides EuX (X = O, Se, Te) are presented: linear and quadratic magneto-optical Kerr effects, photo-induced Faraday effect, magnetically-induced optical second and third harmonics generation, the inverse Faraday effect, and the phenomenon of optical orientation. A large quadratic magneto-optical Kerr effect was found in EuO and (Eu, Gd)O films. Photo-induced spin polarons with a huge value of the magnetic moment were studied in europium chalcogenides EuTe and EuSe using the optical pump-probe technique. In the same materials, a new type of nonlinear magneto-optical susceptibility, which is responsible for the optical second harmonic generation and associated with the magnetic ordering of the spins of Eu^2+ ions, is revealed.
Магнитные фазовые переходы в несоизмеримую магнитную структуру в соединении FeGe-=SUB=-2-=/SUB=-
Authors: Меньшенин В.В.
Published: February 2019

AbstractA symmetry analysis of possible magnetic structures in an incommensurate magnetic phase in FeGe_2 compound, resulted from phase transitions from the paramagnetic phase, was performed based on a phenomenological consideration. It is shown that two possible approaches to a such an analysis, the first of which uses the magnetic representation of the space group, and the second one is based on the expansion of the magnetic moment in basis functions of irreducible representations of the space group of the paramagnetic phase, yield the same results. Space group irreducible representations are determined, according to which the transition to an incommensurate structure can occur. The set of these representations appears identical in both approaches. Ginzburg–Landau functionals for analyzing the transitions according to these representations are written. A renormalization group analysis of the second-order phase transitions from the paramagnetic state to the incommensurate magnetic structure is performed. It is shown that a helical magnetic structure can arise in the incommensurate phase as a result of two second-order phase transitions at the transitions temperature.
Влияние перпендикулярного электростатического поля на вызванный аэродинамическими силами первичный распад тонкой плоской струи жидкого диэлектрика
Authors: Коровин В.М. , Кажан В.А.
Published: February 2019

AbstractThe disintegration of a plane nonconductive jet of a high-permittivity liquid has been studied. The jet moves with constant velocity in a gas that is quiescent at infinity in the presence of a perpendicular electrostatic field. Initially, the boundaries of the jet are parallel to each other. Its thickness is much smaller than the capillary constant. The gas density has been included into the list of governing parameters. The case has been considered when aerodynamic forces arising from wave disturbance of the gas–liquid interface make a greater contribution to the dynamics of the liquid than capillary forces. It has been shown that when the jet is aerodynamically unstable, the application of a perpendicular electric field with moderate intensity considerably decreases fragments of the jet after disintegration.
Аномалии упругих и неупругих свойств нанокомпозитов Co-=SUB=-x-=/SUB=-(PZT)-=SUB=-100-x-=/SUB=-
Authors: Тарасов Д.П.
Published: February 2019

AbstractThe elastic ( G ) and inelastic ( Q ^–1) properties of Co_ x (PZT)_100 –_ x nanocomposites ( x = 23–76 at %) obtained by ion-beam sputtering have been studied in the temperature range 200–900 K. Internal friction peaks associated with Co atom hopping inside metallic granules have been discovered at 236 K. It has been found that the peak height grows with metallic phase concentration. Above 750 K, curve Q ^–1( T ) rises considerably because of vacancy diffusion in Co granules under conditions of confined space.
Генерация мягкого рентгеновского излучения в компактном лазере на свободных электронах с умножением гармоник
Authors: Жуковский К.В.
Published: February 2019

AbstractSingle-pass free-electron lasers (FELs) with harmonic multiplication in the X-ray range are studied theoretically with the objective of producing intense radiation with the minimum possible FEL length, beam energy, and seed laser frequency. A cascade FEL with a two-frequency undulator for electron bunching at wavelengths of higher harmonics is proposed. The dynamics of radiation power in a FEL with harmonic multiplication cascades is investigated based on a well-proven phenomenological FEL model that covers all major losses for each harmonic in each FEL cascade. The effect of the beam quality on X-ray generation in a FEL is examined. It is demonstrated that electron beams with energy spread σ_ e ≤ 0.0002 are required for efficient use of harmonics in a cascade X-ray FEL. The evolution of power of harmonics in several cascade FELs at wavelengths of ~2–3 nm with multiplication of seed harmonics at a wavelength of 13.51 nm (Mo/Si reflection peak) and 11.43 nm (MoRu/Be reflection peak) is studied. It is demonstrated that the power increases to ~1 GW at a FEL length up to 40 m. In addition, the operation of multicascade FELs with a seed F _2 excimer 157-nm UV laser and harmonics of lasers with CO_2 and C_2H_2 at 30 nm with a beam of electrons with an energy of ~0.6 GeV and a current of ~1 kА is studied. The power of the modeled X-ray radiation of these FELs at λ = 2.5 and 3.3 nm increases to ~0.5 GW at ~30 m.
Нелинейная динамика паттернов импульсной активности ноцицептивных нейронов при коррекции повреждающего болевого воздействия
Authors: Дик О.Е.
Published: February 2019

AbstractA bifurcation analysis of a nociceptive neuron model was performed to study how the firing activity pattern changes when an antinociceptive response to damaging pain stimulation arises in rat dorsal ganglia. Ectopic train activity was found to arise in the model. Suppression of train activity was demonstrated to proceed solely through modification of the activation gating structure of the Na _ V 1.8 slow sodium channel in response to comenic acid, which exerts an analgesic effect and is an active ingredient of the new nonopioid analgesic Anoceptin.
Инициированная ударной волной эмиссия ионов из напряженных гранитов
Authors: Щербаков И.П. , Веттегрень В.И. , Мамалимов Р.И. , Махмудов Х.Ф.
Published: February 2019

AbstractIn this paper, we obtained intensity distributions of beams of positively charged ions emitted from the surface of uniaxially compressed granites under the effect of a shock wave. The intensity of beams decreases exponentially with an increase in the number of shock waves. The ions fly out at the moments when the dislocations reach the surface moving in intersecting slip planes. A compressive load suppresses the dislocation release and the intensity of ion beams.
Теоретико-групповая интерпретация спектров гигантского комбинационного рассеяния фталоцианина меди, адсорбированного на фосфиде галлия
Authors: Полуботко А.М. , Челибанов В.П.
Published: February 2019

AbstractSpectra of surface-enhanced Raman scattering of a copper phthalocyanine molecule adsorbed on a GaP substrate are studied. It is shown that very strong lines forbidden in typical Raman scattering appear in the spectrum. Analysis of the spectra indicates that these lines are caused by the appearance of a strong quadrupole interaction in the system, as well as by strong enhancement of tangential components of electric field strength. As was shown earlier, the last effect is characteristic of surface enhanced Raman scattering by semiconductor and dielectric substrates, where not only normal but also tangential components of the field strength are enhanced on the surface.
Калибровка температуры по спектрам флуоресценции допированного эрбием свинцово-фторидного стекла
Authors: Ходасевич М.А. , Асеев В.А. , Варакса Ю.А. , Борисевич Д.А.
Published: February 2019

AbstractMultivariate methods are applied to the calibration of temperature in the range from 299 to 423 K for the green fluorescence spectra of erbium in lead–fluoride glass doped with 0.5 mol % of erbium and 10 mol % of ytterbium. It is shown that the regression to latent structures using the combination of moving spectral windows is characterized, among the considered methods, by the lowest value (0.2 K) of the root-mean-squared error of prediction of temperature over the test set. Artificial neural networks using two principal components as input variables, the broadband regression to latent structures, the artificial neural network using all the spectral data samples as input variables, and regression to the principal components are inferior in accuracy of the temperature calibration.
Влияние металлических наночастиц на распространение предельно коротких оптических импульсов в графене
Authors: Конобеева Н.Н. , Скворцов Д.С. , Белоненко М.Б.
Published: February 2019

AbstractThe propagation of two-dimensional extremely short optical pulses in graphene with metal nanoparticles has been investigated. The effects that are observed when changing the parameters of the effective Hamiltonian, which takes into account the exchange interaction, have been studied. It has been revealed that the introduction of metallic adatoms into graphene leads to an increase in the amplitude of the pulse. This effect can be enhanced by choosing a particular metal particle .
Анализ оптических свойств однородных металлических, окисных наночастиц и двухслойных наночастиц с металлическим ядром и окисной оболочкой с целью эффективного поглощения солнечной радиации
Authors: Астафьева Л.Г. , Пустовалов В.К. , Фритче В.
Published: February 2019

AbstractProblems related to using nanoparticles for absorption of solar radiation and photothermal nanotechnologies are now being actively studied. The efficiency of using nanoparticles as photothermal agents for solar energy is determined by their spectral optical properties. We performed computer simulation of optical properties of homogeneous metal (nickel, titanium, and molybdenum) nanoparticles and their oxides, along with nanoparticles consisting of a metal core and an oxide shell, with radii in the range from 50 to 100 nm in the spectral interval between 200 and 2500 nm. The influence of nanoparticle radius, the type of metal and its oxide on spectral coefficients of efficiency absorption ( K _abs) and scattering ( K _sca) of radiation by nanoparticles is investigated. The type of nanoparticles suitable for absorption of solar radiation was chosen based on a comparative analysis of the wavelength dependences of absorption efficiency coefficients K _abs, intensity of solar radiation I _ S , and parameter P _1 = K _abs/ K _sca. Spherical double–layer nanoparticles consisting of nickel or titanium core and oxide shells with a radius of 75 or 100 nm can be used in the spectral interval from 200 to 2500 nm for efficient absorption of solar radiation. These results are a substantial contribution to the investigation of optical properties of nanoparticles that can be used in systems of thermal energy.
Фоторефрактивная подстройка коэффициента деления интегрально-оптического направленного X-ответвителя на подложке ниобата лития
Authors: Парфенов М.В. , Тронев А.В. , Ильичев И.В. , Агрузов П.М. , Шамрай А.В.
Published: February 2019

AbstractThe possibility of correcting the power coupling ratio of an integrated optical directional X-coupler upon excitation of a local photorefractive response in the substrate material (LiNbO_3) has been analyzed. The X-coupler operation has been numerically simulated, and the regions of its maximum sensitivity to photorefraction have been determined. The correspondence between the calculated and experimental data has been obtained. The maximum correction value of the coupling ratio is 1–2%. The photorefractive correction of the coupling ratio has been used to increase the extinction ratio of a Mach–Zehnder modulator to 47 dB.
Влияние кулоновских сил на процессы роста золота на поверхности диэлектрических подложек
Authors: Власов В.П. , Муслимов А.Э. , Каневский В.М.
Published: February 2019

AbstractA model of interaction of gold nanoislands during chemical vapor deposition in vacuum both in the presence of charges in the vapor and after their removal has been considered. A growth stage has been revealed (the mean sediment thickness is more than 2 nm) in which the mutual attraction of gold nanoislands and a sharp increase in their sizes is observed. In this stage, the sediment with removed charges exhibits retardation of the nanoisland growth. The influence of the substrate geometric profile on the sediment morphology is demonstrated. These investigations are promising for development of methods for nanocoating segmentation and formation of ordered nanoisland ensembles.
Простейшая эрозионная плазменная пушка из коаксиального кабеля с полиэтиленовой изоляцией
Authors: Коробков С.В. , Гущин М.Е. , Гундорин В.И. , Зудин И.Ю. , Айдакина Н.А. , Стриковский А.В. , Николенко А.С.
Published: February 2019

Abstract—A compact pulsed plasma generator of simple design made of a coaxial cable with polyethylene insulation has been described. A plasma gun generates a cloud of carbon-hydrogen plasma with an electron density of more than 10^13 cm^–3, including in a magnetic field produced of up to 500 G and also in the presence of the background plasma with a density of about 10^12 cm^–3, which is produced by an independent source. The high resource of the gun and stability of plasma parameters from one pulse to another allows using such a gun in laboratory experiments simulating dynamic processes in space.
Каскадные солнечные элементы на основе наногетероструктур GaP/Si/Ge
Authors: Лунин Л.С. , Лунина М.Л. , Пащенко А.С. , Алфимова Д.Л. , Арустамян Д.А. , Казакова А.Е.
Published: February 2019

AbstractGaP/Si/Ge nanoheterostructures have been obtained using the method of pulsed laser deposition, and an energy band diagram of cascade solar cells based on these heterostructures were modeled. GaP and Ge nanolayers grown on Si substrates were studied by Raman spectroscopy and X-ray diffraction. Spectral dependences of the external quantum efficiency response of GaP/Si/Ge nanoheterostructures were determined.
Столкновения капель жидкости разной формы в газовом потоке
Authors: Кузнецов Г.В. , Стрижак П.А.
Published: February 2019

AbstractWe have experimentally studied the interaction between water drops of various surface configurations moving in a gas medium. Results of high-speed video monitoring provide a database on these collisions (in coagulation, expansion, and fragmentation regimes) for particles of spherical, oblate, and elongated ellipsoids. It is established that a determining role belongs to the surface configuration of drops (in addition to traditional notions about the influence of their dimensions, velocities, and angle of attack). The values of Weber numbers have been calculated for description of the conditions of interaction between drops of various shapes.
ON THE CONCEPT OF URBAN CITIZENSHIP
Authors: Božilovć Jelena
Published: February 2019

Urban citizenship is a frequent topic in studies in social sciences and it carries many different and ambiguous meanings. This paper is focused on the studies of urban citizenship as a type of the new concepts of citizenship, which is based on the idea that the city is a primary social and political community within which individuals and groups should exercise their rights. Contemporary demands for urban citizenship are mostly seen as a corrective of the neoliberal policy and unequal social power reflected on the use of space, and they are based on the viewpoint that a more inclusive policy is needed, which would include more citizens in decision making with regard to the (city) space. In this way, its pronounced commercial and consumer function would be reduced, and its use value would increase. In addition to urban citizenship being related to the idea of the right to the city at the theoretical and practical level, it is also based on the concept of citizenship (as a broader term under which it falls) and this paper also points to its variations.
Habitar sin la vista. Proyectar con las manos
Authors: Marín López Lucía , Durán López Rodrigo
Published: February 2019

La arquitectura ha privilegiado el sentido de la vista en los últimos tiempos para ser apreciada. Derivado de esto, los sistemas constructivos han perdido su honestidad material original, siendo reemplazada por aproximaciones más escenográficas. Este artículo reflexiona en torno a la percepción del habitar cuando no se cuenta con el sentido de la vista y cómo se puede realizar el diseño participativo de una vivienda incluyente, progresiva y autoproducida, cuando ésta es para una persona invidente.
El museo judío de Berlín: El espacio, el acontecimiento y el Vacío
Authors: Vaccaro Cruz María Cristina
Published: February 2019

En este artículo se estudia el Museo Judío de Berlín, de Daniel Libeskind –en particular la Torre del Holocausto– desde la idea del “acontecimiento” del filósofo francés Jean-François Lyotard y su discusión con la categoría estética de lo sublime del empirista Edmund Burke. Se trata de analizar las afectaciones sensibles que provocan ciertas experiencias en los sujetos y sus implicaciones políticas y sociales.
Competencias para la innovación en las universidades de América Latina: un análisis empírico
Authors: Vila Luis E. , Dávila Quintana C. Delia , Mora José-Ginés
Published: February 2019

Los egresados universitarios constituyen, en cualquier país, el grupo social que acumula un mayor volumen de capital humano debido a que su trayectoria educativa ha sido más prolongada y ha requerido una fuerte inversión. La premisa de esta investigación es que el potencial de innovación que aportan estos egresados es un determinante fundamental tanto para el éxito en su trayectoria profesional como para la eficiencia total de los sistemas de producción en los distintos países. Para su realización, se dispuso de una amplia base de datos provenientes de la macro encuesta PROFLEX realizada a unos 10 000 egresados universitarios latinoamericanos a la que se ha aplicado una estimación de funciones de producción multinivel.
Los profesores ante las innovaciones curriculares
Authors: Díaz-Barriga Arceo Frida
Published: February 2019

En los procesos de reforma curricular emprendidos en las instituciones educativas mexicanas durante la última década, los profesores aparecen como responsables últimos de concretar los modelos educativos innovadores en el aula. Para entender los retos que enfrenta el docente frente a la innovación del currículo y la enseñanza, hay que avanzar en la comprensión de cómo es que aprenden los profesores, qué los impele a cambiar o no sus prácticas educativas, qué procesos ocurren cuando se enfrenta la tarea de innovar o qué condiciones se requieren para que un cambio real ocurra y se consolide. En este artículo se revisan algunos estudios que dan cuenta de dichos procesos, así como una serie de análisis y propuestas emanadas de especialistas en el tema.
Estudio comparativo de universidades mexicanas (ECUM): otra mirada a la realidad universitaria
Authors: Márquez Jiménez Alejandro
Published: February 2019

El 27 de enero del año en curso, la Universidad Nacional Autónoma de México (UNAM) realizó la presentación oficial del Estudio Comparativo de las Universidades Mexicanas (ECUM) y de su herramienta de exploración de datos en línea denominado ExECUM. Ambos proyectos fueron desarrollados por la Dirección General de Evaluación Institucional (DGEI) de la UNAM, cuyo propósito central consiste en aportar información comparable sobre las características y funciones de las universidades y de otras instituciones mexicanas de educación superior. Este documento constituye una invitación a conocer dicho estudio y a valorar sus alcances y limitaciones en un contexto donde la publicación de rankings universitarios se ha constituido en un referente importante en la valoración social del desempeño de las instituciones de educación superior. El documento se divide en tres partes; en la primera se describen algunas diferencias entre el enfoque y metodología del ECUM y los utilizados por algunos de los rankings (nacionales e internacionales) más importantes; en la segunda parte, se describen las características del ECUM y de su herramienta de exploración de datos ( ExECUM), los rubros de datos que actualmente contiene y las posibilidades que brinda a sus potenciales usuarios para analizar la información disponible; en la tercera parte se presentan algunos de sus principales resultados.
El curriculum y la doble lógica de inserción (lo universitario y las prácticas profesionales)
Authors: Follari Roberto-Agustín
Published: February 2019

La práctica intrauniversitaria y sus reglas autolegitimatorias no tienen relación directa con las prácticas profesionales de quienes egresan de las universidades. Así, los planes de estudio pueden mantener sistemática disociación con las necesidades profesionales, sin que ello implique disfunción alguna dentro de la actividad universitaria. Por cierto que la Universidad no tiene por qué responder mecánicamente a las demandas del mercado; pero sí debe asumir que la noción de crítica social  debe resultar inmanente a las prácticas profesionales para las cuales se forma a los estudiantes. De lo contrario, se prepara a los mismos para el desempleo y la inadecuación laboral, o para un discurso que será abandonado en cuanto se inicie la actividad profesional.
San Carlos de Guatemala. Universidad pública o universidad conventual
Authors: Pérez-Puente Leticia
Published: February 2019

El artículo tiene por objetivo reflexionar sobre las circunstancias en que se inscribió la solicitud que hiciera el obispo Enríquez de Rivera para la fundación de la Universidad de San Carlos de Guatemala y mostrar las diferencias que, a consideración de aquél prelado, existían entre las universidades reales, llamadas también públicas, y las conventuales.Finalmente, el trabajo propone que la creación de la Universidad de San Carlos, así como la desaparición de las universidades conventuales en América, se debieron a las transformaciones que a finales del siglo XVII sufrió la organización eclesiástica indiana, debido al creciente secularismo y al auge que entonces alcanzaron las catedrales americanas.
Socioepistemología y prácticas sociales. Hacia una enseñanza dinámica del cálculo diferencial
Authors: Camacho-Ríos Alberto
Published: February 2019

Esta investigación busca dinamizar la enseñanza de algunos conceptos del cálculo diferencial, a fin de mejorar su comprensión. La dinamización que se plantea se hizo a través de reconocer actividades de la topografía desarrolladas en diferentes épocas, concebidas en el escrito como prácticas de referencia. La acción de incorporar ese tipo de prácticas en la enseñanza matemática, se hace necesaria en la aproximación teórica conocida como socioepistemología, por la falta de modelos más organizados que lleven a los estudiantes a un establecimiento efectivo del conocimiento a través de su resignificación. Como ejemplo del trabajo experimentado con estudiantes, se expone el uso de la anticipación como práctica social que regula la actividad escolar de dos casos relacionados con la razón trigonométrica seno, que se plantean en el escrito.
¿Profesionistas del futuro o futuros taxistas? Los egresados universitarios y el mercado laboral en México
Authors: De Vries Wietse , Navarro Yadira
Published: February 2019

El aporte que hace una universidad al futuro de sus estudiantes es un tema controversial. Informes oficiales acostumbran perfilar a la educación superior como el impulsor para el desarrollo económico y social, pero al mismo tiempo ponen esta aseveración en duda, al señalar que muchos egresados se encuentran desempleados o trabajando como taxistas. Este artículo presenta el análisis de los datos de un proyecto internacional de seguimiento de egresados en el que participaron nueve universidades mexicanas. Los datos revelan que efectivamente existen problemas de desempleo, pero también que las razones detrás de estos problemas son complejas y no siempre bien entendidas por los hacedores de políticas.
El Sistema de Asignación y Transferencia de Créditos Académicos (SATCA) en México: origen, seguimiento y prospectivas
Authors: Sánchez Escobedo Pedro , Martínez Lobatos Lilia
Published: February 2019

El presente trabajo analiza el origen, evolución, situación actual y escenarios futuros de la implantación en México del Sistema Nacional para la Asignación y Transferencia de Créditos Académicos (SATCA), aprobado por la asamblea general de la Asociación Nacional de Universidades e Instituciones de Educación Superior (ANUIES) en octubre del 2007. Este nuevo esquema pretende sustentar las innovaciones curriculares vigentes en las instituciones de educación superior (IES), como son la flexibilidad de los planes y programas de estudios, así como facilitar la movilidad estudiantil, disminuyendo costos y perjuicios a estudiantes que desean o tienen que cambiar de institución educativa.El SATCA muestra aceptación en las instituciones por parte de académicos, pero administradores manifiestan reservas en virtud de los costos y las necesidades de ajustar los procesos normativos y de control escolar. Se clarifican nomenclaturas, aplicación de criterios, rangos para ponderar programas de estudio, así como las limitaciones del SATCA y se argumenta que la substitución de los antiguos criterios de Tepic por este nuevo sistema es un proceso claramente definido, fundamentado e irreversible.
La ética profesional y el narcisismo benigno en la formación de la identidad del investigador en educación en México
Authors: Colina Escalante Alicia de los Ángeles
Published: February 2019

Este trabajo forma parte de una investigación más amplia sobre el crecimiento del campo de la investigación educativa en México, en relación con sus agentes. Uno de los objetivos de dicha investigación es comprender cómo se ha construido la identidad profesional de dichos agentes. En el presente documento abordaremos la importancia que tiene la interiorización de valores y el desarrollo de un narcisismo benigno en la ética profesional y la productividad de los investigadores en educación en México.
Polarización y tensiones en la educación superior venezolana
Authors: García Guadilla Carmen
Published: February 2019

En este trabajo se presenta un análisis de la situación de la educación superior en Venezuela, tomando como eje la polarización y tensiones existentes en el país. Se reseña la diferencia entre las políticas públicas entre el primero y el segundo periodo del gobierno de Hugo Chávez, pero especialmente se destaca la perjudicial polarización así como las fuertes tensiones entre el sector que representa a las universidades públicas autónomas y las nuevas instituciones (no autónomas) creadas durante todo el periodo del actual gobierno. En este texto se considera, con fines analíticos, que el sistema de la educación superior está constituido por diferentes dimensiones que representan ejes interconectados, entre ellos la autora destaca, para el caso que examina: autonomía, rendición de cuentas, ingreso, financiamiento y diferenciación institucional. A partir de estos ejes, presenta una serie de reflexiones que podrían ser útiles en los diferentes escenarios posibles, a partir de las elecciones venezolanas en octubre del 2012, para crear un sistema nacional de educación superior que responda a las necesidades de todos los sectores del país, pues la educación no debe ser una política de gobierno, sino una política de Estado con la participación y responsabilidad de toda la sociedad.
Enseñanza para la comprensión en la educación superior: la experiencia de una universidad costarricense
Authors: Salgado-García Edgar
Published: February 2019

El modelo de Enseñanza para la Comprensión (EpC) constituye un enfoque de enseñanza-aprendizaje basado en competencias y desempeños, asociado con las teorías constructivistas, y desarrollado desde la década de los noventa en el Proyecto Zero, de la Universidad de Harvard. Si bien existen actualmente múltiples experiencias en la educación básica y secundaria, su aplicación en educación superior es relativamente nueva, y mucho más como modelo pedagógico institucional. La Universidad Latinoamericana de Ciencia y Tecnología (ULACIT), de San José, Costa Rica, se ha dado a la tarea de impulsar la construcción de un enfoque educativo propio, inspirado en el modelo EpC, específicamente para el ámbito universitario. En este artículo se presenta una sistematización de los primeros pasos hacia la incorporación de un modelo basado en EpC, los cuales, a lo largo de dos años, empiezan a dar frutos. Se espera que este reporte pueda contribuir a la innovación educativa en la formación universitaria.
Riéndose aprende la gente. Humor, salud y enseñanza aprendizaje
Authors: Fernández Poncela Anna María
Published: February 2019

Este texto ofrece una breve revisión general de carácter documental en torno a la importancia del humor y la risa en el proceso de enseñanza aprendizaje. En el mundo de hoy y con los cambios educativos que se están dando, la utilización de la risa es algo importante. El humor y la risa han sido poco valorados en el contexto educativo. En la actualidad parece oportuno introducirlos como parte de las destrezas y competencias educativas. La risa es buena para la vida y la salud, y lo es también para la educación. Otra cuestión que se trata en este texto es un estudio de caso en una universidad pública en México sobre el uso de la risa en la educación.
PENGGUNAAN THINK TALK WRITE (TTW) DENGAN MENYERTAKAN HAND OUT UNTUK MEMBANTU PEMAHAMAN SISWA PADA MATERI PERSAMAAN GARIS LURUS DI MTSN KEPANJEN
Authors: Fahrudin Fadrik Adi
Published: February 2019

Students of State Islamic Junior High School (MTsN) Kepanjen find themselves difficult in understanding a chapter of straight line equation. The learning method used is considered to be text book oriented and being teacher centered learning. This research aims to increase students participatory and be more student centered learning. It used a new model of learning called Think Talk Write (TTW) along with passing out the hand out to students. This too attempts to have students understanding regarding a chapter of straight line equation.Type used was classroom action research and held on a eigth year students of MTsN Kepanjeng. Object of this research were students of class VIII-C and were divided into nine group, each one consists of four students. They were grouped based on their degree of ability ranging from high, moderate and low. Data collected was analysed using data reduction, presenting and drawing conclusion toward students test result, observation, interview and field notes. Teacher distributed hand out to students and they have been asked individually to read and think through the contents. The objective was to gain preliminary  nowledge. Afterwards, they worked in group to discuse the idea and concept as well as doing the assigments. Teacher as a facilitator brainstormed the concept and guide students to present it in front of class. By the end of the class, students and teacher have got together to make a conclusion of all. The result showed TTW along with the hand-out have able to improve students understanding over straight line equation. The final test showed the students grade of accomplishment has reached by 88,89%.
PENYELESAIAN PERSAMAAN DIFERENSIAL BIASA NON LINIER MENGGUNAKAN METODE DEKOMPOSISI ADOMIAN
Authors: Fitriana Hanna -
Published: February 2019

The Bernoulli equation
PENGEMBANGAN MODUL MATEMATIKA BERBASIS LKS DENGAN PENDEKATAN PROBLEM BASED LEARNING
Authors: Zuhro Anna Ulfatu
Published: February 2019

This research was conducted to develop teaching materials modul-based mathworksheets (LKS) with problem based learning approach. By developing the teaching materials is expected to help students learn independently and improve students’ ability in solving mathematical problems. The teaching materials developed with 4-D Thiagarajan development model that has been modified into 3-D that define, design, development. Validated teaching materials developed by lecturers and teacher of mathematics. The result were obtained validity for two aspects : the average material 4 and the average media aspect 4. These teaching materials declared valid. For the feasibility study gained an average of 4.1 and student response gained an average of 4.2, which was developed into simpleteaching materials. And as many as 26 students scored above the KKM with a percentage of 87% proved the effectivity of the teaching materials.
THE ANALYSIS OF PROBLEM BASED LEARNING IN LEARNING MATHEMATICS SENIOR HIGH SCHOOL
Authors: Anggraeni Tiara , In'am Akhsanul , Taufik Marhan
Published: February 2019

This study aims to determine the level of response, the level of motivation,student learning outcomes and learning process using Problem Based Learningon learning mathematics. This research is descriptive research where there isno manipulation only to describe and to analyze the data obtained. Thisresearch uses quantitative research methods with the subjects of the studywhich amounted to 33 people. Data collection techniques used includequestionnaires, observations, interviews and tests. Data analysis used in thisresearch is qualitative analysis technique and quantitative analysis. The resultof the research indicates that the students response level to Problem BasedLearning is high with the percentage of achievement of 72.02% and thestudents' motivation level with the percentage of achievement of 70.05%.Student learning outcomes obtained using Problem Based Learning are quitesatisfactory. With the percentage of achievement level reached 75.75%. Withthe Minimum Exhaustiveness Criteria (KKM) score at the school is 75, so thatall students meet the given KKM.
The Improvement of Result Learning Mathematic Through Peer Teaching Method on The Factorization Algebra Material of The Students VIII-3 Class at SMP Negeri 5 Parepare
Authors: Arifin Arifin , Musa Hastuty , Alam Samsir
Published: February 2019

The research is a class action (Classroom Action Research). The aim of this research is to determine whether learning result can improve through learning mathematics Peer Teaching Method of factorization algebra material of students in class VIII3 at SMP Negeri 5 Parepare. The method of the researcher was Peer Teaching Method (a teaching method their peers in small groups). The subject of research is the students of VIII3 class at SMP Negeri 5 Parepare that is consisted of 18 students. The implementation of this research consisted of two cycles in each cycle consisting of four stages, such as: (a) planning stage, (b) action stage, (c), observation stage, (d) reflection stage. The collecting data analyzed by quantitative and qualitative analysis. The conclusion is the result of mathematic learning can improve through peer teaching method of the students VIII3 class at SMP NEGERI 5 PAREPARE.
Project-Based Learning: Road to Make Connection between Concept and Skills in Mathematics Manipulative Media
Authors: Wulandari Tri Candra , Qamar Kawakibul
Published: February 2019

Mathematics is based on certain concepts and rules, teachers must motivatestudents to be able to express the concept in the real world yet. not allmathematical material is abstract or all mathematical material can be madereal. Therefore, there needs to be a bridge between the abstract world andthe real world. Mathematics Manipulative Media is one of the subjects inmathematics education program at Kanjuruhan University. This subjects isgiven to third year students this class started using Project-Based Learning(PBL). PBL was design to teach the student with combining concept andstudent skills. These skills include communication and presentation skills,organization and time management skills, research and inquiry skills, selfassessmentand reflection skills, group participation and leadership skills,and critical thinking. All of these skills are needed for their life in theirsociety. Implementation of PBL in this manipulative media class is doneusing 4 stages, namely the delivery of rules and concepts, the delivery ofideas, product/creation solution and problem conclusion. While the skillsinvolved at each stage are communication and presentation skills, time andorganizational management skills, searching and discovering skills, selfassessingand reflection skills, leadership and lead skills, and criticalthinking.
Learning Polyhedrons Based On It
Authors: Hajar Siti
Published: February 2019

Learning resources and media play very important roles in learningactivities in the classroom. Various learning resources complemented withinteractional media will encourage the learners to be more active in theclassroom. The objective of this present research is to analyze whatlearning resources and media are used by the teacher in learningpolyhedrons. This research was conducted in MTs N Malang 1. Themethods of data collection were observations and interviews. To obtain thedata, the researcher made observations during learning activities and thencompared the data from the observations and those of the interviews withthe teacher concerned and with one of the students joining in the learningactivities. The data were qualitative in nature. Based on the data analysis, itwas revealed that learning resources and media used were IT-based. Thelearning resources were electronic books and the package books for GradeVIII and the media were the property from Power Point. The learningbasedIT for students Grade VIII-A MTs N Malang 1 gave good effects on allstudents, so that all of them joined in the learning activities actively.
Application of geoinformation technologies for arranging a satellite monitoring system
Authors: Kadochnikov A.A.
Published: February 2019

Today, remote sensing data are an important source of operational information about the environment for thematic GIS, this data can be used for the development of water, forestry and agriculture management, in the ecology and nature management, with territorial planning, etc. To solve the problem of ensuring the effective use of the space activities’results in the Krasnoyarsk Territory a United Regional Remote Sensing Center was created. On the basis of the Center, a new satellite receiving complex of FRC KSC SB RAS was put into operation. It is currently receiving satellite data from TERRA, AQUA, Suomi NPP and FENG-YUN satellites. Within the framework in cooperation with the Siberian Regional Center for Remote Sensing the Earth, an archive of satellite data from domestic Resource-P and Meteor-M2 satellites was created. The work considers some features of softwaredevelopment and technological support tools for loading, processing and publishing remote sensing data. The product is created in the service-oriented paradigm based on geoportal technologies and interactive web-cartography. The focus in this article is paid to the peculiarities of implementing the software components of the web GIS, the efficient processing and presentation of geospatial data.
I. P. Zarutskaya’s contribution to cartographic research in Russia: to the 110th anniversary of her birth
Authors: Batuev A.R. , Kotova T.V. , Postnikov A.V. , Snytko V.A.
Published: February 2019

In 2018 we celebrated the 110th anniversary of Irina Zarutskaya (1908–1990). She was a professor of Moscow State University, and her name is closely connected with the formation and development of geographical cartography. The authors noted the importance of Irina Zarutskaya’s contribution to the theory and methodology of geographical cartography. We also highlighted her implementation in topographic mapping when she took part in the process of preparing the general geographic and thematic maps of Russia in the scale 1
Landscape and ecological mapping Moscow for purposes of substantiation of territorial planning the city
Authors: Nizovtsev V.A. , Ehrman N.M.
Published: February 2019

Our studies were based on landscape and ecological investigations and aimed at determining the landscape and ecological potential of the territory of Moscow. The purpose was to implement into consider in the territorial planning of the city and to make proposals for a balanced and efficient development of the urban area, securing a comfortable living of the population, protection of the environment and cultural heritage, taking into account the interrelated development of Moscow and the Moscow region. The research involved basic landscape mapping, landscape- historical and landscape-ecological research, detailed analysis of natural, cultural and historic features of the city, assessment of landscapes (natural and anthropogenic) and the identification of conditions and factors limiting the development of the territory. The theoretical foundation of studies is the concept of landscape planning based on objectively existing local and regional physiographic differentiation, landscape structure, and functional zonation of the territory, which takes into account spatial distribution of landscapes and various grounds differing in special-purpose destination and use. It was for the first time that a series of original maps for the entire territory of Moscow was created at scale 1
Using thematic maps of different eras in the training of cartography students
Authors: Prokhorova Е.А. , Tulskaya N.I.
Published: February 2019

Looking into the history of the objects and phenomena under study is necessary forboth the enrichment of any research and, accordingly, for the presentation of its results on maps. In addition, historical maps can be useful for studying those methods of mapping that were practiced before, and which can be used nowadays. There is an obvious need to pay more attention to historical maps in the process of training students in thematic mapping so that they get basic ideas about the principles and methods of compiling, designing old maps, and learn to understand the content and capabilities of using them in scientific and practical work. Geohistorical approach is interesting in studying various aspects of natural and socio-economic phenomena. The article deals with issues related to displaying the opportunities of using old and antique thematic maps at training cartography students at Geography Faculty of Moscow State University.