Inselect: Automating the Digitization of Natural History Collections

Copyright: © 2015 Hudson et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. The attached file is the published version of the article

SHORT-STEP-STUB CHEBYSHEV IMPEDANCE TRANSFORMERS.

A general procedure is presented for the synthesis of short-step impedance transforming filters consisting of short cascaded TEM transmission-line sections and at least one commensurate length open-circuit stub. One member of the short-step family in particular is very compact and relatively easy to implement. Simple expressions for evaluating the passband performance of impedance transformers are derived, and element values are given for a selection of compact octave-bandwidth transformers. The relationship between short-step transformers and lumped-element impedance matching networks is pointed out, leading to an exact procedure for the semilumped implementation of lumped-element transformers.Articl

The ‘Objects’ view.

<p>This view shows objects in a grid. The selected object lacks a mandatory metadata field so is shown in red.</p

Segmented image containing overlapping specimens.

<p>Example of segmented image of Mycalesina (a group of butterflies).</p

Segmented image of moth specimens.

<p>Example of a segmented image of Chalcosiinae (a subfamily of moths) specimens.</p

Segmented image of microscope slides.

<p>Example of a segmented image of microscope slides of benthic Foraminifera in a rock thin section.</p

Comparison of features in <i>Inselect</i> with current multi-specimen image segmentation solutions.

<p>Comparison of features in <i>Inselect</i> with current multi-specimen image segmentation solutions.</p

The ‘Boxes’ view.

<p>This view shows the scanned image together with bounding boxes around specimens. This document is a scan of 1,160 individuals of Tetrastichinae (a subfamily of wasps). The boxes for one tray of specimens are selected, shown outlined in light blue.</p