2,291 research outputs found
Honey, Dat I Love So Well : A Dainty Darkey Ditty
https://digitalcommons.library.umaine.edu/mmb-vp/4215/thumbnail.jp
Autonomous Apple Fruitlet Sizing with Next Best View Planning
In this paper, we present a next-best-view planning approach to autonomously
size apple fruitlets. State-of-the-art viewpoint planners in agriculture are
designed to size large and more sparsely populated fruit. They rely on lower
resolution maps and sizing methods that do not generalize to smaller fruit
sizes. To overcome these limitations, our method combines viewpoint sampling
around semantically labeled regions of interest, along with an attention-guided
information gain mechanism to more strategically select viewpoints that target
the small fruits' volume. Additionally, we integrate a dual-map representation
of the environment that is able to both speed up expensive ray casting
operations and maintain the high occupancy resolution required to informatively
plan around the fruit. When sizing, a robust estimation and graph clustering
approach is introduced to associate fruit detections across images. Through
simulated experiments, we demonstrate that our viewpoint planner improves
sizing accuracy compared to state of the art and ablations. We also provide
quantitative results on data collected by a real robotic system in the field
Only One Daisy Left : Waltz Song And Refrain
https://digitalcommons.library.umaine.edu/mmb-vp/5552/thumbnail.jp
The Membrane Components of Crustacean Neuromuscular Systems.: II. Analysis of interactions among the electrogenic components
The present work provides additional evidence for the occurrence of a number of
electrogenic components in crustacean and particularly crayfish muscle fibers. It
demonstrates that these different components are independent. One or another can be
eliminated or modified by various procedures without affecting the rest. However,
interactions can occur between the different components. The coupling may be effected by
the changes in membrane potential which result from changes in ionic permeabilities or by
changes in the membrane conductance. Some interactions of such couplings which can perturb
electrophysiological measurements are described and analyzed
The Membrane Components of Crustacean Neuromuscular Systems: I. Immunity of different electrogenic components to tetrodotoxin and saxitoxin
Axon spikes in crayfish and lobster neuromuscular preparations were blocked by
tetrodotoxin or saxitoxin (concentration 10−9 to
10−8 g/ml). Responses evoked in the excitatory synaptic membrane by
ionophoretically applied glutamate, or in the inhibitory by GABA were unaffected by
concentrations of the poisons up to 10−5 g/ml. These confirm other
findings that the poisons do not affect electrically inexcitable membrane components.
“Miniature” p.s.p.’s, which indicate local secretory activity in
the presynaptic terminals were unaffected by the poisons. Electrical stimuli applied to
the axon terminals elicited localized p.s.p.’s after spike electrogenesis of the
axons was blocked. Thus, persistence of secretory activity may be linked to persistence of
depolarizing K activation in the axons. Spikes induced in the muscle fibers by procaine
were not affected by the poisons. In correlation with other data this finding indicates
that the depolarizing electrogenic element, which does not depend upon Na activation in
the normally gradedly responsive muscles, differs chemically from the Na activation
component which is present in the conductile membrane of various cells. Three other
varieties of electrically excitable response which are present in crayfish muscle fibers
(hyperpolarizing Cl activation, depolarizing K inactivation, and K activation) were,
likewise, immune to the toxin
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