Results 71 to 80 of about 363,653 (297)

Building Contour Extraction from Fused LiDAR and Photogrammetric Point Clouds Using PointNet++ [PDF]

The International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences
Accurate building contour extraction is critical for urban modeling but remains challenging due to limitations in single-source point clouds. LiDAR data suffers from sparsity and sensitivity to surface reflectance, while photogrammetric point clouds ...
J. Zhao, M. Cao, J. Yang
doaj   +1 more source

Wall Orientation and Shear Stress in the Lattice Boltzmann Model

, 2012
The wall shear stress is a quantity of profound importance for clinical diagnosis of artery diseases. The lattice Boltzmann is an easily parallelizable numerical method of solving the flow problems, but it suffers from errors of the velocity field near ...
Aidun, Anor, Artoli, Axner, Berger, Bernsdorf, Bonert, Boussel, Bouzidi, Boyd, Carallo, Caro, Cebral, Cecchi, Chopard, Christ, Cosgrove, Dai, d’Humieres, Gohil, Harvey, He, He, Higuera, Jou, Krüger, Krüger, Ku, Ku, Luo, Maciej Matyka, Malek, McNamara, Meyerson, Milner, Nesbitt, Nickolls, Pantos, Papaioannou, Paszkowiak, Patankar, Peng, Peters, Pohl, Pontrelli, Quarteroni, Reneman, Shaaban, Stahl, Tse, Tölke, Xian, Zbigniew Koza, Łukasz Mirosław   +53 more
core   +1 more source

Influence of Sample Preparation and Processing Procedures on the Thermal Diffusivity of MgO‐C Refractories

Advanced Engineering Materials, EarlyView.
The thermal diffusivity of MgO‐C refractories is highly sensitive to sample preparation and processing procedures. In this article, the effects of coking sequence, machining conditions, structural inhomogeneity, and graphite coating application on measurements using laser flash apparatus are systematically investigated.
Luyao Pan, Rhena Wulf, Till M. J. Stadtmüller, Christos G. Aneziris, Tobias M. Fieback   +4 more
wiley   +1 more source

Geometric Error Identification of Gantry-Type CNC Machine Tool Based on Multi-Station Synchronization Laser Tracers

Chinese Journal of Mechanical Engineering
Laser tracers are a three-dimensional coordinate measurement system that are widely used in industrial measurement. We propose a geometric error identification method based on multi-station synchronization laser tracers to enable the rapid and high ...
Jun Zha, Huijie Zhang
doaj   +1 more source

Design, Modeling, and Geometric Control on SE(3) of a Fully-Actuated Hexarotor for Aerial Interaction [PDF]

, 2017
In this work we present the optimization-based design and control of a fully-actuated omnidirectional hexarotor. The tilt angles of the propellers are designed by maximizing the control wrench applied by the propellers.
Engelen, Johan, Kuipers, Petra, Rashad, Ramy, Stramigioli, Stefano   +3 more
core   +1 more source

Tribological Performance of 60NiTi Alloy Under Varying Contact Conditions and Elevated Temperatures in Linear Reciprocating Sliding

Advanced Engineering Materials, EarlyView.
This study investigates the tribological response of 60NiTi alloy under dry, water‐lubricated and high‐temperature conditions. The alloy exhibits decreasing wear volume and friction with increasing temperature due to the formation of protective oxide layers. The work clarifies dominant wear mechanisms and demonstrates the suitability of 60NiTi for high‐
Anthony Onyebuchi Okoani, Miguel Angel Selles, Maziar Ramezani   +2 more
wiley   +1 more source

Comprehensive Error Modeling and Analysis of Face Gear NC Grinding Machine based on Multi-body System Theory

Jixie chuandong, 2015
By using the theory of multi-body system and Denavit-Hartenberg homogeneous coordinate transformation,the geometric error and thermal error of face gear NC grinding machine is analyzed.According to the principle of face gear meshing and production ...
Ming Xingzu, Wang Wei, Zhao Lei, Li Mande   +3 more
doaj  

Automated Generation of Geometric FE Models for Timber Structures Using 3D Point Cloud Data

Buildings
Manual geometric modeling of timber structures is time-intensive and error-prone, impeding efficient structural analysis. To overcome this limitation, this study develops an automated framework for the rapid generation of 3D geometric finite element (FE)
Lin Chen, Liufang Jiang, Haibei Xiong
doaj   +1 more source

Motion Planning of Uncertain Ordinary Differential Equation Systems [PDF]

, 2011
This work presents a novel motion planning framework, rooted in nonlinear programming theory, that treats uncertain fully and under-actuated dynamical systems described by ordinary differential equations.
Hays, Joe, Hong, Dennis, Sandu, Adrian, Sandu, Corina   +3 more
core   +1 more source

Enhanced Gamma Radiation Shielding Using Epoxy Quartz Fabric Composites Reinforced With CoCl2 Microparticles

Advanced Engineering Materials, EarlyView.
The growing demand for lightweight, nontoxic, and multifunctional gamma shielding materials has intensified efforts to find alternatives to conventional lead and aluminum‐based protectants. In this work, we develop epoxy quartz fabric composites reinforced with cobalt chloride (CoCl2) microparticles, fabricated via hand lay‐up with varying filler ...
Summan Urooge, Ahsan Irshad, Umar Jamil, Srosh Fazil, Khuram Liaqat, Kashif Shahzad, Fakhar Alam, Mehboob Alam   +7 more
wiley   +1 more source