Results 51 to 60 of about 399,123 (289)

Semidefinite Descriptions of the Convex Hull of Rotation Matrices [PDF]

SIAM Journal on Optimization, 2014
We study the convex hull of $SO(n)$, the set of $n\times n$ orthogonal matrices with unit determinant, from the point of view of semidefinite programming. We show that the convex hull of $SO(n)$ is doubly spectrahedral, i.e., both it and its polar have a
J. Saunderson, P. Parrilo, A. Willsky
semanticscholar   +1 more source

Interactive Prompt‐Guided Robotic Grasping for Arbitrary Objects Based on Promptable Segment Anything Model and Force‐Closure Analysis

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
A laser pointer‐guided robotic grasping method for arbitrary objects based on promptable segment anything model and force‐closure analysis is presented. Grasp generation methods based on force‐closure analysis can calculate the optimal grasps for objects through their appearances. However, the limited visual perception ability makes robots difficult to
Yan Liu, Yaxin Liu, Ruiqing Han, Kai Zheng, Yufeng Yao, Ming Zhong   +5 more
wiley   +1 more source

Design for Copying Grouser and Bionic Convex Hull Patterns on Track Surfaces of Crawler Combine Harvesters

Agriculture
In the rainy season, which often has uncertain rainfall, crawler combine harvesters have difficulty traversing wet and soft rice fields. A large amount of clay is often accumulated on the track surfaces, resulting in frequent slipping and sinking, which ...
Lulu Yuan, Zhong Tang, Sifan Liu, Ting Wang, Zhao Ding   +4 more
doaj   +1 more source

An Efficient Index Building Algorithm for Selection of Aggregator Nodes in Wireless Sensor Networks

International Journal of Distributed Sensor Networks, 2014
In wireless sensor networks (WSNs), aggregator nodes perform the data aggregation process. Thus, careful selection of the aggregator nodes is needed to reduce network traffic in data aggregation process and prolong overall lifetime of the network.
Sun-Young Ihm, Aziz Nasridinov, Young-Ho Park   +2 more
doaj   +1 more source

SuperResNET: Model‐Free Single‐Molecule Network Analysis Software Achieves Molecular Resolution of Nup96

Advanced Intelligent Systems, Volume 7, Issue 3, March 2025.
SuperResNET is a powerful integrated software that reconstructs network architecture and molecular distribution of subcellular structures from single molecule localization microscopy datasets. SuperResNET segments the nuclear pore complex and corners, extracts size, shape, and network features of all segmented nuclear pores and uses modularity analysis
Yahongyang Lydia Li, Ismail M. Khater, Christian Hallgrimson, Ben Cardoen, Timothy H. Wong, Ghassan Hamarneh, Ivan R. Nabi   +6 more
wiley   +1 more source

Biomimetic Structural Design for Reducing the Adhesion Between Wet Rice Leaves and Metal Surfaces

Agriculture
Adhesion behavior between wet rice leaves and metal surfaces exacerbates the difficulty in separating and removing grains in the cleaning device.
Pengfei Qian, Qi He, Zhong Tang, Tingwei Gu   +3 more
doaj   +1 more source

Grass functional traits reflect the long history of fire and grazers in the savannas of Texas

American Journal of Botany, EarlyView.
Abstract Premise Understanding relationships among grass traits, fire, and herbivores may help improve conservation strategies for savannas that are threatened by novel disturbance regimes. Emerging theory, developed in Africa, emphasizes that functional traits of savanna grasses reflect the distinct ways that fire and grazers consume biomass ...
Ashish N. Nerlekar, Daniel Spalink, Joseph W. Veldman   +2 more
wiley   +1 more source

High‐Pressure Synthesis of Nitrogen‐Rich Y(N5)3·N2 Pentazolate with Perovskite Topology

Angewandte Chemie International Edition, EarlyView.
Yttrium pentazolate, Y(N5)3·N2, with an exceptionally high nitrogen‐to‐metal ratio of 17:1 and perovskite topology, was synthesized from yttrium and nitrogen at 125 GPa and 3000 K in a laser‐heated diamond anvil cell. Abstract The discovery and stabilization of the cyclo‐N5⁻ anion have introduced a class of pentazolate compounds with significant ...
Andrey Aslandukov, Yuqing Yin, Maxim Bykov, Alena Aslandukova, Fariia I. Akbar, Eleanor Lawrence Bright, Igor A. Abrikosov, Natalia Dubrovinskaia, Leonid Dubrovinsky   +8 more
wiley   +1 more source

A Moment-Based Shape Similarity Measurement for Areal Entities in Geographical Vector Data

ISPRS International Journal of Geo-Information, 2018
Shape similarity measurement model is often used to solve shape-matching problems in geospatial data matching. It is widely used in geospatial data integration, conflation, updating and quality assessment. Many shape similarity measurements apply only to
Zhongliang Fu, Liang Fan, Zhiqiang Yu, Kaichun Zhou   +3 more
doaj   +1 more source

Computing metric hulls in graphs [PDF]

Discrete Mathematics & Theoretical Computer Science, 2019
We prove that, given a closure function the smallest preimage of a closed set can be calculated in polynomial time in the number of closed sets. This implies that there is a polynomial time algorithm to compute the convex hull number of a graph, when all
Kolja Knauer, Nicolas Nisse
doaj   +1 more source