197,715 research outputs found
Tailorable infrared sensing device with strain layer superlattice structure
An infrared photodetector is formed of a heavily doped p-type Ge sub x Si sub 1-x/Si superlattice in which x is pre-established during manufacture in the range 0 to 100 percent. A custom-tailored photodetector that can differentiate among close wavelengths in the range of 2.7 to 50 microns is fabricated by appropriate selection of the alloy constituency value, x, to establish a specific wavelength at which photodetection cutoff will occur
Diffusion semigroup on manifolds with time-dependent metrics
Let , on a differential manifold equipped
with time-depending complete Riemannian metric , where
is the Laplacian induced by and is a
family of -vector fields. We first present some explicit criteria for
the non-explosion of the diffusion processes generated by ; then establish
the derivative formula for the associated semigroup; and finally, present a
number of equivalent semigroup inequalities for the curvature lower bound
condition, which include the gradient inequalities, transportation-cost
inequalities, Harnack inequalities and functional inequalities for the
diffusion semigroup
LO-Net: Deep Real-time Lidar Odometry
We present a novel deep convolutional network pipeline, LO-Net, for real-time
lidar odometry estimation. Unlike most existing lidar odometry (LO) estimations
that go through individually designed feature selection, feature matching, and
pose estimation pipeline, LO-Net can be trained in an end-to-end manner. With a
new mask-weighted geometric constraint loss, LO-Net can effectively learn
feature representation for LO estimation, and can implicitly exploit the
sequential dependencies and dynamics in the data. We also design a scan-to-map
module, which uses the geometric and semantic information learned in LO-Net, to
improve the estimation accuracy. Experiments on benchmark datasets demonstrate
that LO-Net outperforms existing learning based approaches and has similar
accuracy with the state-of-the-art geometry-based approach, LOAM
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