A study of 2D features for 3D visual SLAM

Paper submitted to the 43rd International Symposium on Robotics (ISR), Taipei, Taiwan, August 29-31, 2012.

How Climate and Vegetation Influence the fire Regime of the Alaskan Boreal Biome: The Holocene Perspective

We synthesize recent results from lake-sediment studies of Holocene fire-climate-vegetation interactions in Alaskan boreal ecosystems. At the millennial time scale, the most robust feature of these records is an increase in fire occurrence with the establishment of boreal forests dominated by Picea mariana: estimated mean fire-return intervals decreased from ≥300 yrs to as low as ∼80 yrs. This fire-vegetation relationship occurred at all sites in interior Alaska with charcoal-based fire reconstructions, regardless of the specific time of P. mariana arrival during the Holocene. The establishment of P. mariana forests was associated with a regional climatic trend toward cooler/wetter conditions. Because such climatic change should not directly enhance fire occurrence, the increase in fire frequency most likely reflects the influence of highly flammable P. mariana forests, which are more conducive to fire ignition and spread than the preceding vegetation types (tundra, and woodlands/forests dominated by Populus or Picea glauca). Increased lightning associated with altered atmospheric circulation may have also played a role in certain areas where fire frequency increased around 4000 calibrated years before present (BP) without an apparent increase in the abundance of P. mariana. When viewed together, the paleo-fire records reveal that fire histories differed among sites in the same modern fire regime and that the fire regime and plant community similar to those of today became established at different times. Thus the spatial array of regional fire regimes was non-static through the Holocene. However, the patterns and causes of the spatial variation remain largely unknown. Advancing our understanding of climate-fire-vegetation interactions in the Alaskan boreal biome will require a network of charcoal records across various ecoregions, quantitative paleoclimate reconstructions, and improved knowledge of how sedimentary charcoal records fire events.

The popular piano collection. [music].

Illustrated t.p.

Schreiben eines Freundes der Kunst an Herrn Gallerie-Director Krahe in Düsseldorf, die Beleuchtung eines Gemäldes vorzüglich betreffend.

An essay on the use of lightning in two landscape paintings by Nicolaas Pietersz Berchem and Aelbert Cuyp.

Der Blitz in der orientalischen und griechischen Kunst, bis zum Einsetzen des rotfigurigen Stiles /

Inaugural-Dissertation.

Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise,

"Credit is largely due to Frank D. Graham ... for the authorship of the Guides, and for the original sketches illustrating electrical principles and construction."--Pref. to no. 1.

Traite des paratonnerres : leur utilite, leur théorie, leur construction /

Mode of access: Internet.

Severe weather preparedness.

"NOAA Weather Radio"--p. 10.

Dissertation sur la cause et la nature du tonnerre et des eclairs : avec l'explication des divers phénoménes qui en dépendent ... /

First gathering, unsigned, has vertical chain lines.

Unterricht vom Blitz und den Blitz- oder Wetter Ableitern : zur Belehrung und Beruhigung sonderlich der Ungelehrten und des gemeinen Mannes : mit einer Kupfertafel /

Signatures: pi1 2pi⁴ A⁸(-A1) B-I⁸ K⁴(-K4).

The first booke of canzonets to two voices /

With piano accompaniment "for rehearsal only."

A history of the warfare of science with theology in christendom /

Includes bibliographical references and index.

First M.E. Church

Scene shortly after a severe hail and snow storm on May 5, 1906. The steeple, 176 ft. high, was struck by lightning and a little later much of the burning portion fell into the street.

Instruction sur les paratonnerres /

"Signé, Poisson, Lefèvre-Gineau, Girard, Dulong, Fresnel, et Gay-Lussac, rapporteur"--p. 51.

Bi-sensory, striped representations: comparative insights from owl and platypus

Bi-sensory striped arrays are described in owl and platypus that share some similarities with the other variant of bi-sensory striped array found in primate and carnivore striate cortex: ocular dominance columns. Like ocular dominance columns, the owl and platypus striped systems each involve two different topographic arrays that are cut into parallel stripes, and interdigitated, so that higher-order neurons can integrate across both arrays. Unlike ocular dominance stripes, which have a separate array for each eye, the striped array in the middle third of the owl tectum has a separate array for each cerebral hemisphere. Binocular neurons send outputs from both hemispheres to the striped array where they are segregated into parallel stripes according to hemisphere of origin. In platypus primary somatosensory cortex (SI), the two arrays of interdigitated stripes are derived from separate sensory systems in the bill, 40,000 electroreceptors and 60,000 mechanoreceptors. The stripes in platypus SI cortex produce bimodal electrosensory-mechanosensory neurons with specificity for the time-of-arrival difference between the two systems. This thunder-and-lightning system would allow the platypus to estimate the distance of the prey using time disparities generated at the bill between the earlier electrical wave and the later mechanical wave caused by the motion of benthic prey. The functional significance of parallel, striped arrays is not clear, even for the highly-studied ocular dominance system, but a general strategy is proposed here that is based on the detection of temporal disparities between the two arrays that can be used to estimate distance. (C) 2004 Elsevier Ltd. All rights reserved.