Results 51 to 60 of about 5,254 (164)

Exact 3D boundary representation in finite element analysis based on Cartesian grids independent of the geometry [PDF]

, 2015
This paper proposes a novel Immersed Boundary Method where the embedded domain is exactly described by using its Computer-Aided Design (CAD) boundary representation with Non-Uniform Rational B-Splines (NURBS) or T-splines.
Boor, Bordas, Borden, Cirak, Cottrell, Dolbow, Escobar, Gil, Goldman, Gordon, Hassan, Hughes, Inoue, Johnson, Jörg, Kim, Legrain, Legrain, Liu, Liu, Liu, Liu, Lorensen, Martin, Melenk, Mittal, Nadal, Parvizian, Peskin, Piegl, Rogers, Ródenas, Rüberg, Sederberg, Sederberg, Sevilla, Sevilla, Sevilla, Sevilla, Sevilla, Strouboulis, Szabó, Tur, Tur, Wandzura, Wang, Wang, Zhang, Zhang, Zhang, Zienkiewicz   +50 more
core   +1 more source

Simulating and correcting the pileup effect in deep‐silicon photon‐counting CT

Medical Physics, Volume 52, Issue 8, August 2025.
Abstract Background Photon‐counting computed tomography (CT) bears promise to substantially improve spectral and spatial resolution. One reason for the relatively slow evolution of photon‐counting detectors in CT—the technology has been used in nuclear medicine and planar radiology for decades—is pulse pileup, that is, the random staggering of pulses ...
Erik Fredenberg, Daniel Collin, Louis Carbonne, Mingye Wu, Bruno De Man, Fredrik Grönberg   +5 more
wiley   +1 more source

Transient analysis of laminated composite plates using NURBS-based isogeometric analysis

Vietnam Journal of Mechanics, 2014
We further study isogeometric approach for response analysis of laminated composite plates using the higher-order shear deformation theory. The present theory is derived from the classical plate theory (CPT) and the shear stress free surface conditions ...
Lieu B. Nguyen, Chien H. Thai, Ngon T. Dang, H. Nguyen-Xuan   +3 more
doaj   +1 more source

An adaptive, hanging-node, discontinuous isogeometric analysis method for the first-order form of the neutron transport equation with discrete ordinate (SN) angular discretisation [PDF]

, 2017
In this paper a discontinuous, hanging-node, isogeometric analysis (IGA) method is developed and applied to the first-order form of the neutron transport equation with a discrete ordinate (SN) angular discretisation in two-dimensional space.
Eaton, M, Kophazi, J, Owens, A, Welch, J
core   +1 more source

Parametric modeling for automated intelligent design of concrete beam bridges: A global and local optimization approach

Structural Concrete, Volume 26, Issue 4, Page 4083-4102, August 2025.
Abstract The structural design of prestressed concrete girders in beam bridges is performed by coupling 3D parametric modeling, optimization, and statistical techniques, structural analysis, and design. The objective is to explore the potential and advantages of advanced design methodologies based on intelligent design.
Vinicius Nascimento de Moraes, Thomaz Eduardo Teixeira Buttignol   +1 more
wiley   +1 more source

Local distortion as a pitfall of iterative MLEM reconstruction in myocardial perfusion imaging – A phantom study

Journal of Applied Clinical Medical Physics, Volume 26, Issue 7, July 2025.
Abstract Purpose To provide insight into appearance of local distortion as a pitfall and to assess performance of MLEM reconstruction in presence of a high‐contrast object or hot spot and to quantify extent of involvement, specifically in myocardial perfusion imaging. Methods A checkerboard image is reconstructed with MLEM with and without the presence
Mohsen Qutbi
wiley   +1 more source

T-spline based unifying registration procedure for free-form surface workpieces in intelligent CMM [PDF]

, 2017
With the development of the modern manufacturing industry, the free-form surface is widely used in various fields, and the automatic detection of a free-form surface is an important function of future intelligent three-coordinate measuring machines (CMMs)
Han, Zhenhua, Liu, Shugui, Ma, Xinhui, Wang, Yingmo, Zhang, Guoxiong, Zhang, Xiaodong   +5 more
core   +2 more sources

Shape Sensitivity Analysis of History‐Dependent Materials for Dynamic Structures

PAMM, Volume 25, Issue 1, March 2025.
ABSTRACT This work presents a sensitivity analysis of inelastic material behavior within dynamic structures. The primary focus is on using the direct differentiation method to derive sensitivity matrices for displacement, velocity, acceleration, and history variables. These methods are validated through a detailed academic example.
Seyed Ali Ghasemi, Franz‐Joseph Barthold   +1 more
wiley   +1 more source

Optimization-Driven Reconstruction of 3D Space Curves from Two Views Using NURBS

Mathematics
In the realm of 3D curve reconstruction, Non-Uniform Rational B-Splines (NURBSs) offer a versatile mathematical tool due to their ability to precisely represent complex geometries.
Musrrat Ali, Deepika Saini, Sanoj Kumar, Abdul Rahaman Wahab Sait   +3 more
doaj   +1 more source

Isogeometric B\'ezier dual mortaring: Refineable higher-order spline dual bases and weakly continuous geometry

, 2017
In this paper we develop the isogeometric B\'ezier dual mortar method. It is based on B\'ezier extraction and projection and is applicable to any spline space which can be represented in B\'ezier form (i.e., NURBS, T-splines, LR-splines, etc.).
Borden, M. J., Brivadis, E., Dornisch, W., Scott, M. A., Thomas, D. C., Zou, Z.   +5 more
core   +1 more source