2,350 research outputs found
Rocr
A new robot with two claws and a tail that sways like a pendulum is the first robot designed to move efficiently like human rock climbers or apes swinging through trees. This small robot, named ROCR (pronounced "rocker"), can scramble up a carpeted, eight-foot wall in just over 15 seconds. A robot of this design could eventually be used for inspection, maintenance and surveillance, according to its makers, or it can be a really cool toy for children.
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Comment on "Quantitative x-ray photoelectron spectroscopy: Quadrupole effects, shake up, Shirley background, and relative sensitivity factors from a database of true x-ray photoelectron spectra"
This Comment demonstrates that a comparison analysis by Seah and Gilmore
between experimental data on the X-ray photoelectron spectroscopy intensities
and theoretical data by Trzhaskovskaya et al. is misleading due to a number of
serious errors made by Seah and Gilmore (Phys. Rev. B, 73, 174113).Comment: 7 pages, 3 figures, submitted to Phys. Rev.
Kahlerian K3 surfaces and Niemeier lattices
Using results (especially see Remark 1.14.7) of our paper "Integral symmetric
bilinear forms and some of their applications", 1979, we clarify relation
between Kahlerian K3 surfaces and Niemeier lattices. We want to emphasise that
all twenty four Niemeier lattices are important for K3 surfaces, not only the
one which is related to the Mathieu group.Comment: Var7: 88 pages. We added last case
The rationality of the moduli spaces of Coble surfaces and of nodal Enriques surfaces
We prove the rationality of the coarse moduli spaces of Coble surfaces and of
nodal Enriques surfaces over the field of complex numbers.Comment: 15 page
Pedestrian Dead-Reckoning Algorithms For Dual Foot-Mounted Inertial Sensors
This work proposes algorithms for reconstruction of closed-loop pedestrian
trajectories based on two foot-mounted inertial measurement units (IMU). The
first proposed algorithm allows calculation of a trajectory using measurements
from only one IMU. The second algorithm uses data from both foot-mounted IMUs
simultaneously. Both algorithms are based on the Kalman filter and the
assumption that while a foot is on the ground its velocity is supposed to be
zero. Two methods for comparing the obtained trajectories are proposed,
advantages and disadvantages of each method are indicated and a way to optimize
the computation time is presented. In addition, a method is proposed for
constructing one generalized trajectory of human motion based on the
trajectories of each leg.Comment: The data used in the article are available for downloading at
http://gartseev.ru/projects/mkins201
Del Pezzo surfaces with 1/3(1,1) points
We classify del Pezzo surfaces with 1/3(1,1) points in 29 qG-deformation
families grouped into six unprojection cascades (this overlaps with work of
Fujita and Yasutake), we tabulate their biregular invariants, we give good
model constructions for surfaces in all families as degeneracy loci in rep
quotient varieties and we prove that precisely 26 families admit
qG-degenerations to toric surfaces. This work is part of a program to study
mirror symmetry for orbifold del Pezzo surfaces.Comment: 42 pages. v2: model construction added of last remaining surface,
minor corrections, minor changes to presentation, references adde
Investigation of twinning dynamics in VT1-0 titanium using acoustic emission
Use of acoustic emission signals makes it possible to analyze deformation processes in the bulk of a crystalline titanium structure formed under the effect of a concentrated strain created by loading of a diamond pyramidyesBelgorod State Universit
Twinning of alloy VT1-0 after total annealing
Twinning, that occurs in titanium VT1-0 crystals under the action of a concentrated stress, is studied by microindentation methods, recording of acoustic signals and probe microscopy. Some parameters and description of forms of a twinned interlayer in polycrystalline titanium VT1-0 are provided. The possibility of studying this process by recording acoustic emission signals is demonstratedyesBelgorod State Universit
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