1,355,387 research outputs found
Double Wedding Ring quilt Maudie Merla Sharp Harbert
No full textImage of a Double Wedding Ring quilt created about 1931 by Maudie Merla Sharp Harbert. Also includes questionnaires describing the quilt completed by Emma G. Griffin as part of the Utah Quilt Guild\u27s documentation days held from 1988-1994. Estimated date of fabric in quilt probably 1930; Emma inherited it form her mother about 1975. Made by my mother with keep from bemuse busting Sharp (my grandmother)
Electropermeabilization of isolated cancer stem cells with a novel and versatile nanosecond pulse generator
No full textThis paper presents the use of a novel electro-poration generator with an artificial 50Ω buffer for possible real-time neutralization of cancer stem cells. The results from an initial bench study investigates the development of an electro-poration generator capable of delivering non-thermal treatment with an original cuvette housing unit and its effects on isolated cancer stem cell. Initial permeabilization investigation of cancer stem cells were conducted, indicating that the developed protocols and devices have a strong potential future use in achieving electro-manipulation of cancer stem cells. © 2018 IEEE
A wide-band bio-chip for real-time optical detection of bioelectromagnetic interactions with cells
No full textThe analytical and numerical design, implementation, and experimental validation of a new grounded closed coplanar waveguide for wide-band electromagnetic exposures of cells and their optical detection in real-time is reported. The realized device fulfills high-quality requirements for novel bioelectromagnetic experiments, involving elevated temporal and spatial resolutions. Excellent performances in terms of matching bandwidth (less than -10 dB up to at least 3 GHz), emission (below 1 × 10-6 W/m2) and efficiency (around 1) have been obtained as revealed by both numerical simulations and experimental measurements. A low spatial electric field inhomogeneity (coefficient of variation of around 10 %) has been achieved within the cell solutions filling the polydimethylsiloxane reservoir of the conceived device. This original bio-chip based on the grounded closed coplanar waveguide concept opens new possibilities for the development of controlled experiments combining electromagnetic exposures and sophisticated imaging using optical spectroscopic techniques. © 2018 The Author(s)
Infrared thermography: a possible role in psychophysiology of sport?
No full textInfrared thermography (IRT) is an upcoming, promising methodology in the field of psychophysiology. Mental and emotional components of behavior play an important role in the determination of human performance in sporting competition scenario. Driven by sympathetic nerves activity, affective and emotional states derive from muscular activity, skin blood flow and perspiration patterns in specific body parts. The goal of this chapter is to introduce assessment of emotional states and computational psychophysiology through thermal infrared imaging in sport and exercise
A drogadição e o consumo de merla na adolescência
No full textO presente artigo é parte de nossa tese de doutoramento em psicologia, realizada na Universidade de Brasília. Apresenta-se no texto o significado da drogadição, numa
perspectiva relacional, no contexto da adolescência, momento em que se dá o encontro do sujeito com o produto. Foram entrevistados 13 adolescentes usuários ou abusadores de
merla do Distrito Federal, inseridos num contexto institucional de tratamento ou assistência. Aborda-se inicialmente a questão da adolescência e como se dá o encontro com as drogas neste estágio do ciclo de vida familiar. Procura-se entender o significado do uso de drogas para esses jovens usuários/abusadores de merla. Analisa-se também a especificidade do uso da merla na vida desses jovens, procurando-se entender o porquê do uso de uma droga tão nociva e de grande potencial de dependência
Familias transnacionales y solidaridad intergeneracional: las dinámicas de circulación de cuidados entre América Latina y Europa
No full textLa literatura sobre familias transnacionales ha demostrado que los migrantes siguen intercambiando un apoyo personal, practico, emocional y personal con sus familias, a pesar de la distancia que los separan (Baldassar et al. 2007, Kilkey and Merla fc, Merla 2011, Merla fc, Zechner 2008, Zontini and Reynolds 2007,). El concepto de ‘circulación de cuidados’ (Baldassar and Merla fc) pone el acento sobre el carácter multidireccional de los flujos de apoyo que caracterizan las redes familiares transnacionales, y nos invita a sobrepasar las construcciones de flujos de cuidado como fenómenos uni-direccionales (Hochschild 2002). A partir de estudios de caso de Salvadoreños y Dominicanos con miembros en Bélgica, este articulo propone de analizar y caracterizar la circulación de los cuidados entre miembros de familias instalados en América y Europa, y de describir los factores que facilitan o impiden esta circulación
A comparative analysis between customized and commercial systems for complex permittivity measurements on liquid samples at microwave frequencies
No full textIn this paper, different customized systems for microwave permittivity measurements on liquid samples, based on reflectometric measurements, are presented and analyzed. Their performance is compared against the one deriving from the most widely adopted commercial measurement setup. The systems are designed with the aim of providing less expensive solutions without compromising measurement accuracy. The purpose of the first proposed solution is to replace the commercial measurement software exploiting a reformulation of the classical theory. Based on this alternative formulation, a 'homemade' probe is built by properly modifying an N-type coaxial connector, thus providing a system requiring a lower quantity of liquid under test. Moreover, a different experimental approach which uses time-domain reflectometry (TDR) instrumentation is presented. Such solution is by far the least expensive, as it allows avoiding the use of costly instrumentation (such as a vector network analyzer). In order to metrologically characterize the proposed solutions, a series of repeated measurements is performed on a set of well-referenced liquids. After extracting the Cole-Cole parameters through each of the considered measurement methods, the resulting type A uncertainty is evaluated. Finally, comparison with literature data allows the estimation of measurement bias. The analysis evidences that custom solutions generally exhibit an accuracy comparable to the one of the commercial solution, with a slight degradation of performance for the TDR-based setup, which, however, compensates for this drawback with its appealing low cost. © 1963-2012 IEEE
Characterization of a portable and low cost system for practical dielectric spectroscopy
No full textA portable setup for measurements of complex permittivity based on ad-hoc arrangements is proposed and its performance compared to the ones of a bench system. The measurement setup consists of a portable spectrum analyzer (used as vector network analyzer, VNA) connected to an open-end coaxial cable for S11 acquisition. Scattering parameters were processed using custom Labview software specifically developed to obtain complex permittivity of liquids and soft materials in real-time. A suitable calibration procedure, based on a differential principle, enables accurate measurements. Raw results showed that the portable setup provides noisier traces if compared to the performance of a high precision laboratory VNA. However, accurate permittivity data have been achieved introducing filtering to eliminate signal oscillations and spurious noise without loss of information associated to liquid dielectric relaxations. This procedure, applied to standard liquids (ethanol, ethanediol, 2-propanol) showed good performance in terms of bias and precision. Water solutions, used for cell culturing purposes, both conductive and non-conductive, were also successfully measured. The obtained results are a proof of concept that the proposed procedure is a reliable technique to perform fast, low-cost and on site permittivity measurements, useful for diagnostic or therapeutic applications. © 2018 IEEE
Bullying Perpetration and Victimization in Early Adolescence: Physiological Response to Social Exclusion
No full textThe present study investigated the associations between bullying perpetration and victimization and physiological reactivity to social exclusion. The participants were 28 early adolescents (17 boys and 11 girls; Mage= 11.55; SD = 1.34). Bullying perpetration and victimization were assessed by peer nominations. To elicit social exclusion, participants were first included and then excluded in a laboratory paradigm (Cyberball). Physiological reactivity (i.e., nose tip temperature) was detected through thermal infrared imaging during the computer simulation. Nose temperature variations during inclusion and exclusion were compared between each other. Results showed increasing skin temperature during exclusion, compared to inclusion, for the whole sample, indicating that being excluded affected physiological reactivity. However, victimization was associated with higher skin temperature during exclusion, compared to bullying. The present findings suggest the importance of combining behavioral and contact-free physiological measures when studying bullying perpetration and victimization by peers
Biomedical Applications of Thermal Infrared Imaging
No full textThermal infrared imaging is considered an upcoming and promising methodology in the field of biomedicine. This article aims to provide an overview on the literature about the recent developments in the field of biomedical applications of the thermal infrared imaging for the study of the functional properties and modifications of the thermoregulatory system. The analysis of the skin temperature dynamic in response to a stimulus, combined with the modelling of the bioheat exchange processes, are the bases of the methodology, together with the recording of thermal infrared data using advanced technologies. Apart from the recent technical developments, particular emphasis is given to some innovative applications in biomedicine, such as its use in psychophysiological states assessment and sport and exercise sciences
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