Character of the opposition effect and negative polarization

Photometric and polarimetric properties at small phase angles were measured for silicates with controlled surface properties in order to distinguish properties that are associated with surface reflection from those that are associated with multiple scattering from internal grain boundaries. These data provide insight into the causes and conditions of photometric properties observed at small phase angles for dark bodies of the solar system. Obsidian was chosen to represent a silicate dielectric with no internal scattering boundaries. Because obsidian is free of internal scatterers, light reflected from both the rough and smooth obsidian samples is almost entirely single and multiple Fresnel reflections form surface facets with no body component. Surface structure alone cannot produce an opposition effect. Comparison of the obsidian and basalt results indicates that for an opposition effect to occur, surface texture must be both rough and contain internal scattering interfaces. Although the negative polarization observed for the obsidian samples indicates single and multiple reflections are part of negative polarization, the longer inversion angle of the multigrain inversion samples implies that internal reflections must also contribute a significant negative polarization component

Report on 1:100 000 Scale Geological and Metallogenic Maps Sheet 3166-15 Santa Rita de Catuna, Province of La Rioja

Fil: Pieters, P. Australian Geological Survey Organisation; Australia.Fil: Skirrow, Roger G. Australian Geological Survey Organisation; Australia.The 1:100 000 scale Santa Rita de Catuna (3166-15) sheet covers the northeastern part of the Sierra de Chepes, the southeastern part of the Sierra de Los Llanos, and the adjacent plain; this area is located in the southern part of the La Rioja Province (Figures 1, 2). The map area is bounded by latitudes 30°40’ S and 31°00’ S, and by longitudes 66°00’ W and 66°30’ W. The area falls in the southeastern part of the 1:250 000 scale Chamical (3166-I) sheet. The area is easily accessible from Córdoba and La Rioja by Ruta Nacional 38 and Ruta Provincial 32, and from San Juan by Ruta Nacional 141 and Ruta Provincial 32. The nearest regularly serviced airport is located at La Rioja. The nearest major centre of population, logistics and commerce is Chepes on Ruta Nacional 141 located between the Sierra de Chepes and Sierra de Las Minas (outside the map area). Santa Rita de Catuna, Solca, Olpas and Los Aguirres are small population centres in the map area

Report on 1:100 000 Scale Geological and Metallogenic Maps Sheet 3166-14 Malanzán, Province of La Rioja

Fil: Pieters, P. Australian Geological Survey Organisation; Australia.Fil: Skirrow, Roger G. Australian Geological Survey Organisation; Australia.Cubrimiento parcial de la hoja.The 1:100 000 scale Malanzán (3166-14) sheet covers the northwestern part of the Sierra de Chepes, the southwestern part of the Sierra de Los Llanos, and the adjacent plain; this area is located in the southern part of the La Rioja Province (Figures 1, 2). The map area is bounded by latitudes 30°40’ S and 31°00’ S, and by longitudes 67°00’ W and 66°30’ W. The area falls in the central south part of the 1:250 000 scale Chamical (3166-I) sheet. The area is easily accessible from Córdoba and La Rioja by Ruta Nacional 38 and Ruta Provincial 32, and from San Juan by Ruta Nacional 141 and Ruta Provincial 32. The nearest regularly serviced airport is located at La Rioja. The nearest major centre of population, logistics and commerce is Chepes on Ruta Nacional 141 located between the Sierra de Chepes and Sierra de Las Minas (outside the map area). Malanzán and El Portezuelo are small population centres in the map area

Report on 1:100 000 Scale Geological and Metallogenic Maps Sheet 3166-27 Ulapes, Province of La Rioja

Fil: Pieters, P. Australian Geological Survey Organisation; Australia.Fil: Skirrow, Roger G. Australian Geological Survey Organisation; Australia.The 1:100 000 scale Ulapes (3166-27) sheet covers the northern part of the Sierra de Las Minas and the surrounding plain which are located in the southern part of the La Rioja Province (Figures 1, 2). The map area is bounded by latitudes 31°20’ S and 31°40’ S, and by longitudes 66°00’ W and 66°30’ W. The area falls in the central eastern part of the 1:250 000 scale Chepes (3166-III) sheet. The area is easily accessible from Córdoba by Ruta Nacional 38, Ruta Provincial 32 and Ruta Nacional 79, from La Rioja by Ruta Nacional 38 and Rutas Provinciales 27, 28 and 29, and from San Juan by Ruta Nacional 141 and Rutas Provinciale 29. The nearest regularly serviced airport is located at La Rioja. The nearest major centre of population, logistics and commerce is Chepes on Ruta Nacional 141 located between the Sierra de Chepes and Sierra de Las Minas (outside the map area). Ulapes and La Jarilla are small population centres in the area

Report on 1:100 000 Scale Geological and Metallogenic Maps Sheet 3166-20 Ñoquebe, Province of La Rioja

Fil: Pieters, P. Australian Geological Survey Organisation; Australia.Fil: Skirrow, Roger G. Australian Geological Survey Organisation; Australia.Cubrimiento parcial de la hoja.The 1:100 000 scale Ñoquebe (3166-20) sheet covers the southwestern part of the Sierra de Chepes and the adjacent plain; this area is located in the southern part of the La Rioja Province (Figures 1, 2). The map area is bounded by latitudes 31°00’ S and 31°20’ S, and by longitudes 67°00’ W and 66°30’ W. The area falls in the central north part of the 1:250 000 scale Chepes (3166-III) sheet. The area is easily accessible from Córdoba and La Rioja by Ruta Nacional 38 and Ruta Provincial 32, and from San Juan by Ruta Nacional 141 and Ruta Provincial 32. The nearest regularly serviced airport is located at La Rioja. The nearest major centre of population, logistics and commerce is Chepes on Ruta Nacional 141 located between the Sierra de Chepes and Sierra de Las Minas (outside the map area). Ñoquebe, San Antonio, Chepes Vieja, Villa Casana, Puerto La Aguada and La Calera are small population centres in the map area

Multi-label Annotation for Visual Multi-Task Learning Models

Deep learning requires large amounts of data, and a well-defined pipeline for labeling and augmentation. Current solutions support numerous computer vision tasks with dedicated annotation types and formats, such as bounding boxes, polygons, and key points. These annotations can be combined into a single data format to benefit approaches such as multi-task models. However, to our knowledge, no available labeling tool supports the export functionality for a combined benchmark format, and no augmentation library supports transformations for the combination of all. In this work, these functionalities are presented, with visual data annotation and augmentation to train a multi-task model (object detection, segmentation, and key point extraction). The tools are demonstrated in two robot perception use cases.Comment: 5 pages, accepted to IEEE International Conference on Robotic Computin

Combatting electoral traces: the Dutch tempest discussion and beyond

In the Dutch e-voting debate, the crucial issue leading to the abandonment of all electronic voting machines was compromising radiation, or tempest. Other countries, however, do not seem to be bothered by this risk. In this paper, we use actor-network theory to analyse the socio-technical origins of the Dutch tempest issue in e-voting, and its consequences for e-voting beyond the Netherlands. We introduce the term electoral traces to denote any physical, digital or social evidence of a voter's choices in an election. From this perspective, we provide guidelines for risk analysis as well as an overview of countermeasures

Preliminary results of spectral reflectance studies of tycho crater

The preliminary analysis and interpretation of near infrared spectra obtained for both the interior and exterior deposits associated with the Tycho crater is presented. Specific objectives were: (1) to determine the composition and stratigraphy of the highland crust in the Tycho target site; (2) to determine the likely composition of the primary ejecta which may be present in ray deposits; (3) to investigate the nature of spectral units defined in previous studies; (4) to further investigate the nature and origin of both the bright and dark haloes around the rim crest; and (5) to compare the compositions determined for the Tycho units with those of the Aristarchus crater as well as typical highland deposits. The spectra obtained for the interior areas exhibit similar spectral features. These include relatively strong 1 micron absorption bands whose minima are centered between 0.97 and 0.99 microns and shallow to intermediate continuum slopes. The spectra generally exhibit indications of a 1.3 micron feature consistent with the presence of Fe(2+) bearing plagioclase feldspar. The strong 1 micron absorption features indicate a dominant high Ca clinopyroxene component. Results obtained from the ejecta deposits show that the spectrum of the inner, bright halo is almost identical with those obtained for interior units. The spectrum of the dark halo exhibits a wide, relatively shallow absorption feature centered at 1.01 microns, a 1.3 micron absorption, and a steep continuum slope. This spectrum is interpreted as indicating the presence of pyroxene, Fe-bearing feldspar, and a significant component of Fe-bearing impact melt glass. Finally, the spectra of spots inside Tycho show similarity with certain spectra for Aristarchus. However, the suite of spectra obtained for Tycho exhibits a different trend in terms of band center versus width

Co-speech gestures for human-robot collaboration

Collaboration between human and robot requires effective modes of communication to assign robot tasks and coordinate activities. As communication can utilize different modalities, a multi-modal approach can be more expressive than single modal models alone. In this work we propose a co-speech gesture model that can assign robot tasks for human-robot collaboration. Human gestures and speech, detected by computer vision and speech recognition, can thus refer to objects in the scene and apply robot actions to them. We present an experimental evaluation of the multi-modal co-speech model with a real-world industrial use case. Results demonstrate that multi-modal communication is easy to achieve and can provide benefits for collaboration with respect to single modal tools.Comment: 5 pages, accepted to IEEE International Conference on Robotics Computin