Search results for "print"

XRF analysis to identify historical photographic processes: The case of some Interguglielmi Jr.’s images from the Palermo Municipal Archive

2017

Abstract In the early period, even though professional photographers worked with similar techniques and products, their artistic and commercial aims determined different choices and led them to follow different, often personal, recipes. For this reason, identification of the techniques through date and name of the photographer or through some visual features like colour, tonality and surface of the image layer, often needs further investigation to be proved. Chemical characterization, carried out in a non or micro destructive way, can be crucial to provide useful information about the original composition, degradation process, realization technique, in obtaining an indirect dating of the ph…

3D printed diffractive terahertz lenses

2016

[EN] A 3D printer was used to realize custom-made diffractive THz lenses. After testing several materials, phase binary lenses with periodic and aperiodic radial profiles were designed and constructed in polyamide material to work at 0.625 THz. The nonconventional focusing properties of such lenses were assessed by computing and measuring their axial point spread function (PSF). Our results demonstrate that inexpensive 3D printed THz diffractive lenses can be reliably used in focusing and imaging THz systems. Diffractive THz lenses with unprecedented features, such as extended depth of focus or bifocalization, have been demonstrated.

Hands On: incorporación de data sprints y digital methods en la docencia de marketing digital

2022

Este artículo recopila la experiencia acumulada durante 9 años en el diseño y ejecución de data sprints en el marco del Máster en Comunicación y Marketing Digital de la Universitat Autònoma de Barcelona. Con más de 90 proyectos distintos a sus espaldas, estas jornadas han sido un punto de encuentro para profesionales, académicos y estudiantes, posibilitando el intercambio de conocimiento y la transferencia de técnicas entre métodos de investigación del ámbito académico con la investigación aplicada al marketing digital. Al mismo tiempo, el formato data sprint facilita el conocimiento práctico y la adquisición de competencias comunicativas, organizativas y el proceso de resolución de problem…

Aqueous Processed Biopolymer Interfaces for Single-Cell Microarrays

2020

Single-cell microarrays are emerging tools to unravel intrinsic diversity within complex cell populations, opening up new approaches for the in-depth understanding of highly relevant diseases. However, most of the current methods for their fabrication are based on cumbersome patterning approaches, employing organic solvents and/or expensive materials. Here, we demonstrate an unprecedented green-chemistry strategy to produce single-cell capture biochips onto glass surfaces by all-aqueous inkjet printing. At first, a chitosan film is easily inkjet printed and immobilized onto hydroxyl-rich glass surfaces by electrostatic immobilization. In turn, poly(ethylene glycol) diglycidyl ether is graft…

An Heuristic Approach for the Training Dataset Selection in Fingerprint Classification Tasks

2015

Fingerprint classification is a key issue in automatic fingerprint identification systems. It aims to reduce the item search time within the fingerprint database without affecting the accuracy rate. In this paper an heuristic approach using only the directional image information for the training dataset selection in fingerprint classification tasks is described. The method combines a Fuzzy C-Means clustering method and a Naive Bayes Classifier and it is composed of three modules: the first module builds the working datasets, the second module extracts the training images dataset and, finally, the third module classifies fingerprint images in four classes. Unlike literature approaches using …

Droplet-to-droplet microarray for drug screening in picoliter scale

2012

effects of early combined pheromone and food exposure on the behavioral development of adult drosophila melanogaster

2023

In Drosophila melanogaster, pheromonal communication is mainly mediated through sex-specific cuticular hydrocarbons (and derived compounds) and the male lipidic pheromone 11 - cis - Vaccényl Acétate (cVA). When deposited together on the feeding substrate they attract conspecifics males and females, promoting mating and collective behaviors. Initially described as stereotyped, recent findings showed that adult response to pheromones could be plastic and depend on the juvenile experience of an individual (i.e. imprinting). In this context, we studied cVA imprinting through its aggregative effect in individuals whose imprinting has been manipulated.The first goal, behavioral, was to study long…

Advanced Drug Screening platforms by Inkjet printing

2011

In this work, we show a low-cost, speed, microarray-based drug screening platform that employs inkjet printing drug dispensing on an enzymatic-rich surface. Mixtures of a model substrate (Dglucose)/ inhibitor (D-glucal) couple have been inkjet printed on a target enzymatic monolayer (glucose oxidase) linked to a functionalized silicon oxide solid surface [1]. It has been possible to fabricate microarrays with quality factors as high as those of conventional pin printing spotting. By a simple horseradish-based colorimetric enzymatic assay, the detection of biological activity at the single spot has been proved. The figure shows a scheme of the platform: molecular inks of the enzymatic substr…

3D-Printed Solid Dispersion Drug Products.

2019

With the well-known advantages of additive manufacturing methods such as three-dimensional (3D) printing in drug delivery, it is disappointing that only one product has been successful in achieving regulatory approval in the past few years. Further research and development is required in this area to introduce more 3D printed products into the market. Our study investigates the potential of fixed dose combination solid dispersion drug products generated via 3D printing. Two model drugs&mdash

Inkjet printing methodologies for drug screening

2010

We show for the first time a contactless, low-cost, and rapid drug screening methodology by employing inkjet printing for molecular dispensing in a microarray format. Picoliter drops containing a model substrate (D-glucose)/ inhibitor (D-glucal) couple were accurately dispensed on a single layer consisting of the enzymatic target (glucose oxidase) covalently linked to a functionalized silicon oxide support. A simple colorimetric detection method allowed one to prove the screening capability of the microarray with the possibility to assay with high reproducibility at the single spot level. Measurements of the optical signal as a function of concentration and of time verified the occurrence a…