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"Irving, J"
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Volumetric Next-best-view Planning for 3D Object Reconstruction with Positioning Error
Three-dimensional (3D) object reconstruction is the process of building a 3D model of a real object. This task is performed by taking several scans of an object from different locations (views). Due to the limited field of view of the sensor and the object's self-occlusions, it is a difficult problem to solve. In addition, sensor positioning by robots is not perfect, making the actual view different from the expected one. We propose a next best view (NBV) algorithm that determines each view to reconstruct an arbitrary object. Furthermore, we propose a method to deal with the uncertainty in sensor positioning. The algorithm fulfills all the constraints of a reconstruction process, such as new information, positioning constraints, sensing constraints and registration constraints. Moreover, it improves the scan's quality and reduces the navigation distance. The algorithm is based on a search-based paradigm where a set of candidate views is generated and then each candidate view is evaluated to determine which one is the best. To deal with positioning uncertainty, we propose a second stage which re-evaluates the views according to their neighbours, such that the best view is that which is within a region of the good views. The results of simulation and comparisons with previous approaches are presented.
Journal Article
Reaper : ghost target
\"The explosive new thriller series written by Nicholas Irving, the New York Times bestselling author of The Reaper and star of Fox's American Grit. American hero, or unhinged vigilante? In Reaper: Ghost Target, Vick \"The Reaper\" Harwood is an esteemed sniper with a record kill count--33 kills in 90 days--when he is knocked out under mortar attack in Afghanistan. He wakes up back in the United States with little memory of what happened, his spotter and gun both unrecovered from the battlefield. Harwood has resigned himself to slowly picking up the pieces of his life, training Special Forces snipers in Fort Bragg, North Carolina, and starting a promising relationship with an Olympic medalist named Jackie. But when a series of assassinations start occurring in the area, Harwood can't explain why he just happens to be nearby for each killing--or how a sniper rifle that matches the description of the one he lost seems to be involved. His memory of the past few days is hazy and full of blackouts, and even he has to wonder, is he being framed? Or is he the killer? As Harwood runs from the authorities, his girlfriend falls off the radar, his missing spotter resurfaces, and the assassinated men are outed as drug and sex traffickers. Nothing is adding up. Harwood realizes he has to unravel this mystery, and fast, or find himself paying the ultimate price for crimes he may not have committed\"-- Provided by publisher.
Book
Carbon Assimilation, Biomass Partitioning and Productivity in Grasses
Plant growth correlates with net carbon gain on a whole plant basis. Over the last several decades, the driving factors shaping plant morphology and performance have become increasingly clear. This review seeks to explore the importance of these factors for grass performance. Briefly, these fall into factors influencing photosynthetic rates directly, competition between plants in a canopy, and nutrient status and availability.
Journal Article
Cuneiform
Thanks to the use of clay tablets as a writing medium, cuneiform records have survived for thousands of years, providing a fascinating glimpse into the political, economic, and religious institutions of ancient Mesopotamia.
Book
Hybrid approach improves success of chronic total occlusion angioplasty
Treatment options for coronary chronic total occlusions (CTO) are limited, with low historical success rates from percutaneous coronary intervention (PCI). We report procedural outcomes of CTO PCI from 7 centres with dedicated CTO operators trained in hybrid approaches comprising antegrade/retrograde wire escalation (AWE/RWE) and dissection re-entry (ADR/RDR) techniques.
Clinical and procedural data were collected from consecutive unselected patients with CTO between 2012 and 2014. Lesion complexity was graded by the Multicentre CTO Registry of Japan (J-CTO) score, with ≥2 defined as complex. Success was defined as thrombolysis in myocardial infarction 3 flow with <30% residual stenosis, subclassified as at first attempt or overall. Inhospital complications and 30-day major adverse cardiovascular events (MACEs, death/myocardial infarction/unplanned target vessel revascularisation) were recorded.
1156 patients were included. Despite high complexity (mean J-CTO score 2.5±1.3), success rates were 79% (first attempt) and 90% (overall) with 30-day MACE of 1.6%. AWE was highly effective in less complex lesions (J-CTO ≤1 94% success vs 79% in J-CTO score ≥2). ADR/RDR was used more commonly in complex lesions (J-CTO≤1 15% vs J-CTO ≥2 56%). Need for multiple approaches during each attempt increased with lesion complexity (17% J-CTO ≤1 vs 48% J-CTO ≥2). Lesion modification ('investment procedures') at the end of unsuccessful first attempts increased the chance of subsequent success (96% vs 71%).
Hybrid-trained operators can achieve overall success rates of 90% in real world practice with acceptable MACE. Use of dissection re-entry and investment procedures maintains high success rates in complex lesions. The hybrid approach represents a significant advance in CTO treatment.
Journal Article
Does Trypanosoma cruzi (Chagas, 1909) (Kinetoplastida: Trypanosomatidae) modify the antennal phenotype of Triatoma dimidiata (Latreille, 1811) (Hemiptera: Triatominae)?
Background
Triatoma dimidiata
is a vector of the protozoan parasite
Trypanosoma cruzi
, the etiologic agent of Chagas disease. Phenotypic plasticity allows an organism to adjust its phenotype in response to stimuli or environmental conditions. Understanding the effect of
T. cruzi
on the phenotypic plasticity of its vectors, known as triatomines, has attracted great interest because of the implications of the parasite–triatomine interactions in the eco-epidemiology and transmission of the etiologic agent of Chagas disease. We investigated if the infection of the vector with
T. cruzi
may be associated with a change in the antennal phenotype of sylvatic, domestic, and laboratory-reared populations of
T. dimidiata
.
Methods
The abundance of each type of sensillum (bristles, basiconic, thick- and thin-walled trichoid) on the antennae of
T.
cruzi
-infected and non-infected
T.
dimidiata
reared in the laboratory or collected in sylvatic and domestic ecotopes were measured under light microscopy and compared using Kruskal–Wallis non-parametric tests and permutational multivariate analysis of variance.
Results
We found significant differences between sensilla patterns of infected and non-infected insects within sylvatic and domestic populations. Conversely, we found no significant differences between sensilla patterns of infected and non-infected insects within the laboratory-reared population. Besides, for sylvatic and domestic populations, sexual dimorphism tended to be increased in infected insects.
Conclusion
The differences observed in infected insects could be linked to higher efficiency in the perception of odor molecules related to the search for distant mates and hosts and the flight dispersal in search of new habitats. In addition, these insects could have a positive effect on population dynamics and the transmission of
T.
cruzi
.
Graphical Abstract
Journal Article
Hemispherical structure in inner core velocity anisotropy
We investigate the hemispherical pattern in inner core velocity anisotropy using a new and independent high‐quality data set of PKPbc‐PKPdf and PKPab‐PKPdf body wave observations. Our data show no evidence for a tilted anisotropy axis with respect to the Earth's rotation axis and is significantly better fit by a model with 4.4% anisotropy in the western hemisphere and only 1.0% in the eastern hemisphere than by a model of uniform anisotropy. We carry out variance minimization and find the boundaries between the hemispheres at lines of constant longitude at 14°E and 151°W. Variance minimization enables us to extract the imprint of hemispherical structure from all of the data, and not just polar paths, resulting in boundaries which are nearly 30° from the results of previous studies. The high quality of the data allows us to provide robust evidence that the isotropic velocity in the eastern hemisphere is 0.2% lower than in the western hemisphere in the top 660 km of the inner core. Our data set also suggests an increase in inner core anisotropy in the eastern hemisphere from 1% to around 6% at depths deeper than 660 km, indicating that the hemispherical pattern in anisotropy may disappear at greater depths. The presence of hemispherical structure rules out mechanisms for creating anisotropy which are unable to sustain longitudinal variations in the inner core. Furthermore, steady inner core superrotation of the order of 0.1°/year would eradicate the hemispherical differences, though inner core oscillation would still be permissible.
Key Points
Hemisphere boundaries at 14E and 151W using PKPbc‐PKPdf and PKPab‐PKPdf data
The axis of inner core anisotropy is the same as Earth's rotational axis
Eastern hemisphere has a lower isotropic velocity than the western hemisphere
Journal Article