Results 71 to 80 of about 14,263 (192)

The bilinear Bochner-Riesz problem [PDF]

, 2015
32 pagesMotivated by the problem of spherical summability of products of Fourier series, we study the boundedness of the bilinear Bochner-Riesz multipliers $(1-|\xi|^2-|\eta|^2)^\delta_+$ and we make some advances in this investigation.
Bernicot, Frederic, Grafakos, Loukas, Song, Liang, Yan, Lixin   +3 more
core   +1 more source

Purely twistorial string with canonical twistor field quantization

, 2009
We introduce new purely twistorial scale-invariant action describing the composite bosonic D=4 Nambu-Goto string with target space parametrized by the pair of D=4 twistors.
I. A. Bandos, Jerzy Lukierski, L. Brink, R. Penrose, Sergey Fedoruk, V. A. Soroka   +5 more
core   +1 more source

On the bilinear cone multiplier

For $f,g \in \mathscr{S}(\R^n), n\geq 3$, consider the bilinear cone multiplier operator defined by \[{T}^λ_{R}(f,g)(x):=\int_{\mathbb{R}^{2n}}m^λ\left(\frac{ξ'}{Rξ_n},\frac{η'}{Rη_n}\right)\hat{f}(ξ)\hat{g}(η)e^{2πιx\cdot(ξ+η)}~dξdη,\] where $λ>0, R>0$ and \[m^λ\left(\frac{ξ'}{Rξ_n},\frac{η'}{Rη_n}\right)=\Big(1-\frac{|ξ'|^2}{R^2ξ^2_n}-\frac ...
Shrivastava, Saurabh, Shuin, Kalachand
openaire   +2 more sources

Impact of half‐joint failures on RC girder bridges: A robustness quantification study

Structural Concrete, EarlyView.
Abstract The robustness of bridge structures is critical to ensuring safety and service continuity, particularly in aging infrastructure exposed to degradation and unexpected loads. Reinforced concrete (RC) half‐joint bridges—widely built in Italy between the 1950s and 1970s—exhibit specific vulnerabilities due to inspection challenges, durability ...
Paolo Martinelli, Matteo Colombo
wiley   +1 more source

Non-Abelian Duality Based on Non-Semi-Simple Isometry Groups

, 1997
Non-Abelian duality transformations built on non-semi-simple isometry groups are analysed. We first give the conditions under which the original non-linear sigma model and its non-Abelian dual are equivalent.
Alvarez, Alvarez, Alvarez, Alvarez, Antoniadis, Bars, Buscher, Curtright, Cvetic̆, Cvetic̆, de la Ossa, Elitzur, Figueroa-O'Farrill, Fradkin, Fridling, Gasperini, Gasperini, Giveon, Giveon, Giveon, Haagensen, Hassan, Hewson, Hodges, Hull, Jack, Jofre, Kehagias, Kiritsis, Kiritsis, Kiritsis, Klimc̆ík, Klimc̆ík, Klimc̆ík, Maharana, Meissner, Meissner, Mohammedi, Mohammedi, Mohammedi, Nappi, Narain, Noureddine Mohammedi, Olive, Roc̆ek, Schwarz, Schwarz, Sen, Sfetsos, Sfetsos, Sfetsos, Sfetsos, Tseytlin, Tyurin, Veneziano, Veneziano   +55 more
core   +1 more source

Experimental investigation of reinforced concrete members subjected to reversed cyclic axial loading

Structural Concrete, EarlyView.
Abstract This paper presents an experimental campaign of five reinforced concrete members subjected to cyclic axial loading alternating between tension and compression. Fiber optical sensors and digital image correlation, in combination with automated crack detection and measurement, were used to investigate, among other aspects, the development of ...
Simon Karrer, Karel Thoma, Walter Kaufmann   +2 more
wiley   +1 more source

Moment‐curvature behavior of continuous reinforced concrete slab strips—Experimental determination and modeling

Structural Concrete, EarlyView.
Abstract With the market introduction of new reinforcing materials, such as corrosion‐resistant steel, the effect of their stress–strain relationship on the ductility of reinforced concrete structures needs to be evaluated. Their moment‐curvature behavior significantly influences bending moment redistributions, rotation capacity, and deformation at ...
Nathalie Reckinger, Karel Thoma, Walter Kaufmann   +2 more
wiley   +1 more source

A secured cloud‐medical data sharing with A‐BRSA and Salp ‐Ant Lion Optimisation Algorithm

CAAI Transactions on Intelligence Technology, EarlyView.
Abstract Sharing medical data among healthcare providers, researchers, and patients is crucial for efficient healthcare services. Cloud‐assisted smart healthcare (s‐healthcare) systems have made it easier to store EHRs effectively. However, the traditional encryption algorithms used to secure this data can be vulnerable to attacks if the encryption key
Adel Binbusayyis, Abed Alanazi, Shtwai Alsubai, Areej Alasiry, Mehrez Marzougui, Abdullah Alqahtani, Mohemmed Sha, Muhammad Aslam   +7 more
wiley   +1 more source

A Semantic Segmentation Network for Colorectal Polyp Images With Progressive Fusion of Dual‐Branch Features

CAAI Transactions on Intelligence Technology, EarlyView.
ABSTRACT Accurate segmentation of colorectal polyps is essential for early colorectal cancer screening, yet remains challenging due to weak foreground–background contrast, disrupted boundaries caused by specular reflections and intestinal folds, and pronounced scale variation among polyps. These factors make it difficult for existing methods to jointly
Tianxu Yan, Jiabin Yu, Zheng Li, Liangyu Chen, Hongmei Mi, Luyang Chen, Wei Si, Dongping Zhang, Hui Lin   +8 more
wiley   +1 more source

A Real‐Time Multi‐Scale Neural Representation for Complex Surface Reflectance

Computer Graphics Forum, EarlyView.
Abstract Recent machine learning methods have significantly advanced the state of the art in the classic problem of representing surface appearance over angle, space, and scale. The models tend, however, to be relatively heavy compared to traditional fixed‐function representations, making real‐time application challenging.
Heikki Timonen, Pauli Kemppinen, Jaakko Lehtinen   +2 more
wiley   +1 more source