3,693 research outputs found
Application of nuclear volume measurements to comprehend the cell cycle in root-knot nematode-induced giant cells.
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Previous issue date: 2017-08-1
Assessing Social-Emotional Abilities of Preschool-Aged Children Within a Social-Emotional Learning Framework
During the past decade, there has been an increasing amount of research demonstrating a positive relationship between early childhood social-emotional abilities and later life outcomes. As such, practitioners who work with preschool-aged children are called to understand the social-emotional abilities that constitute healthy development. Doing so provides practitioners with a social-emotional framework from which to work so that they may efficiently assess and intervene in these abilities. This manuscript grounds social-emotional abilities within the Collaborative for Academic, Social, and Emotional Learning’s (CASEL) Framework for Social-Emotional Learning (SEL). We describe the need for a multi-method, multi-sourced, multi-setting comprehensive social-emotional assessment of preschool-aged children and describe a rating scale that can be used as a part of the assessment process. The manuscript concludes with a discussion regarding the importance of intervening early to prepare preschool-aged children for future academic and life success
Diffractive triangulation of radiative point sources
We describe a general method to determine the location of a point source of waves relative to a twodimensional
single-crystalline active pixel detector. Based on the inherent structural sensitivity of
crystalline sensor materials, characteristic detector diffraction patterns can be used to triangulate the
location of a wave emitter. The principle described here can be applied to various types of waves,
provided that the detector elements are suitably structured. As a prototypical practical application of
the general detection principle, a digital hybrid pixel detector is used to localize a source of electrons
for Kikuchi diffraction pattern measurements in the scanning electron microscope. This approach
provides a promising alternative method to calibrate Kikuchi patterns for accurate measurements of
microstructural crystal orientations, strains, and phase distributions
Cold atom gas at very high densities in an optical surface microtrap
An optical microtrap is realized on a dielectric surface by crossing a
tightly focused laser beam with an horizontal evanescent-wave atom mirror. The
nondissipative trap is loaded with cesium atoms through elastic
collisions from a cold reservoir provided by a large-volume optical surface
trap. With an observed 300-fold local increase of the atomic number density
approaching , unprecedented conditions of cold atoms
close to a surface are realized
Регулируемый электропривод перекачивающего насоса
Выпускная квалификационная работа содержит 103 страницы,53 рисунка, 25 таблиц, 17 источников и 1 приложение.
Ключевые слова: частотно-регулируемый электропривод, скалярное управление, насосная станция, регулирование давления, цифровой датчик, асинхронный двигатель с короткозамкнутым ротором, преобразователь частоты.
Объектом исследования является частотно-регулируемый электропривод переменного тока насосной станции.
Цель работы – разработка системы автоматического регулирования давления в водозаборном узле.
В результате работы была разработана система автоматического регулирования давления в водозаборном узле, построены схемы в программах LOGO!soft comfort и Matlab.
Достигнутые технико-эксплуатационные показатели: поддержание давления на уровне 3 атмосфер.
Результаты ра
Exploiting cell cycle inhibitor genes of the KRP family to control root-knot nematode induced feeding sites in plants.
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Previous issue date: 2017-08-11bitstream/item/162650/1/Coelho-et-al-2017-Plant-Cell-amp-Environment.pd
Strong anisotropy in surface kinetic roughening: analysis and experiments
We report an experimental assessment of surface kinetic roughening properties
that are anisotropic in space. Working for two specific instances of silicon
surfaces irradiated by ion-beam sputtering under diverse conditions (with and
without concurrent metallic impurity codeposition), we verify the predictions
and consistency of a recently proposed scaling Ansatz for surface observables
like the two-dimensional (2D) height Power Spectral Density (PSD). In contrast
with other formulations, this Ansatz is naturally tailored to the study of
two-dimensional surfaces, and allows to readily explore the implications of
anisotropic scaling for other observables, such as real-space correlation
functions and PSD functions for 1D profiles of the surface. Our results confirm
that there are indeed actual experimental systems whose kinetic roughening is
strongly anisotropic, as consistently described by this scaling analysis. In
the light of our work, some types of experimental measurements are seen to be
more affected by issues like finite space resolution effects, etc. that may
hinder a clear-cut assessment of strongly anisotropic scaling in the present
and other practical contexts
Sympathetic Cooling with Two Atomic Species in an Optical Trap
We simultaneously trap ultracold lithium and cesium atoms in an optical
dipole trap formed by the focus of a CO laser and study the exchange of
thermal energy between the gases. The cesium gas, which is optically cooled to
K, efficiently decreases the temperature of the lithium gas through
sympathetic cooling. The measured cross section for thermalizing
Cs-Li collisions is cm, for both species in
their lowest hyperfine ground state. Besides thermalization, we observe
evaporation of lithium purely through elastic cesium-lithium collisions
(sympathetic evaporation).Comment: 4 pages 3 fig
Testing the proposed link between cosmic rays and cloud cover
A decrease in the globally averaged low level cloud cover, deduced from the
ISCCP infra red data, as the cosmic ray intensity decreased during the solar
cycle 22 was observed by two groups. The groups went on to hypothesise that the
decrease in ionization due to cosmic rays causes the decrease in cloud cover,
thereby explaining a large part of the presently observed global warming. We
have examined this hypothesis to look for evidence to corroborate it. None has
been found and so our conclusions are to doubt it. From the absence of
corroborative evidence, we estimate that less than 23%, at the 95% confidence
level, of the 11-year cycle change in the globally averaged cloud cover
observed in solar cycle 22 is due to the change in the rate of ionization from
the solar modulation of cosmic rays
Two-dimensional atom trapping in field-induced adiabatic potentials
We show how to create a novel two-dimensional trap for ultracold atoms from a conventional magnetic trap. We achieve this by utilizing rf-induced adiabatic potentials to enhance the trapping potential in one direction. We demonstrate the loading process and discuss the experimental conditions under which it might be possible to prepare a 2D Bose condensate. A scheme for the preparation of coherent matterwave bubbles is also discussed
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