Results 31 to 40 of about 14,211,114 (251)

Influence of the Lossy Compression JPEG2000 standard on the Deformation of PSF

Acta Polytechnica, 2011
This paper deals with the influence of lossy compression algorithms on the deformation of the point spread function (PSF) of imaging systems in astronomy.
P. Páta
doaj  

A Rapid and Efficient Optical Transients Identification Framework Based on a Multimodal Neural Network and Machine Learning Operations

The Astrophysical Journal Supplement Series
Wide-field small-aperture telescopes are generally used for transient observations in the optical band, as they can effectively capture images with moderate spatial resolution and depth in a cost-effective way.
Peng Jia, Jiaxin Li, Liang Cao, Shaonan Tian, Yushan Li, Yang Xu, Liping Xin, Jianyan Wei   +7 more
doaj   +1 more source

Dynamic Electrophoretic Assembly Coupled With Water‐Splitting‐Induced pH Control Enables Precision Ion Sieving Membranes

Advanced Materials, EarlyView.
A green, external‐catalyst‐free route grows defect‐free covalent organic framework membranes directly on ion‐exchange supports using an alternating electric field and in situ‐generated acid. Through a self‐regulating, self‐healing mechanism, the membranes achieve near‐complete, ultra‐fast separation of monovalent ions such as Li+, Na+, and K+, offering
Mohammad Hossein Jandaghian, Petric Marc Ruya, Ipek Ozyurt, Ali Atyabi, Samuel Eyley, Wim Thielemans, Alexander Volodin, Riccardo Alessandri, Xing Yang   +8 more
wiley   +1 more source

Aperture Photometric Accuracy of Point-spread-function-deconvolved Astronomical Images

The Astronomical Journal
This paper introduces an improved Richardson–Lucy (RL) framework utilizing negative backfilling (NB) and the novel filtered image deconvolution and noise backfilling (FiDNoBa) algorithm. By integrating a low-pass prefiltering stage—specifically employing
Shen Zhang, Lei Wang, Yachong Diao, Zhaojun Yan, Xiyan Peng, Yao Liu, Huanyuan Shan, Guanghuan Wang, Fengshan Liu, Chengliang Wei, Lin Nie, Xuechun Chen, Hengkai Ding, Zhenya Zheng   +13 more
doaj   +1 more source

Image compression with anisotropic diffusion [PDF]

, 2008
Compression is an important field of digital image processing where well-engineered methods with high performance exist. Partial differential equations (PDEs), however, have not much been explored in this context so far. In our paper we introduce a novel
Welk, Martin, Seidel, Hans-Peter, Seidel, Hans Peter, Joachim Weickert, Weickert, Joachim, Irena Galić, Hans-Peter Seidel, Belyaev, A., Galic, I., Andrés Bruhn, Bruhn, Andrés, Belyaev, Alexander, Alexander Belyaev, Bruhn, A., Seidel, H. ; https://orcid.org/, Martin Welk, Welk, M., Weickert, J., Galić, Irena   +18 more
core   +1 more source

Poly(Alkoxythiophene) Rod‐Coil Block Copolymers for Organic Electrochemical Transistors

Advanced Materials, EarlyView.
We present the first synthesis of poly(3‐alkoxythiophene) rod‐coil block copolymers as a new architecture for OMIECs. Incorporating PEG and PLLA coils can enhance device performance beyond the homopolymer. The figure‐of‐merit depends uniquely on coil length.
Junfu Tian, Wentao Shan, Rachael Found, Paola Mantegazza, Francesco Leoni, Andreas W. Erhardt, Yuyun Yao, Matus Stredansky, Arianna Magni, Adam Marks, Elena Chulanova, Zeinab Hamid, Yueying Huang, Wanpeng Lu, Xian'e Li, Baopu Zhang, Qingpei Wan, Christina Kousseff, Matilde Concilio, Ruth Theresia Arwani, Caroline A. Ross, Sahika Inal, Giovanni Costantini, Iain McCulloch   +23 more
wiley   +1 more source

Optimizing Convolution Direction and Template Selection for Difference Image Analysis

The Astrophysical Journal Supplement Series
Difference image analysis (DIA) is a powerful tool for studying time-variable phenomena, and has been used by many time-domain surveys. Most DIA algorithms involve matching the spatially varying point-spread function shape between science and template ...
Rodrigo Angulo, Armin Rest, William P. Blair, Jacob Jencson, David A. Coulter, Qinan Wang, Ryan J. Foley, Charles D. Kilpatrick, Xiaolong Li, Anthony L. Piro, César Rojas-Bravo   +10 more
doaj   +1 more source

The Impact of KLT Coder on the Image Distortion in Astronomy

Advances in Astronomy, 2015
Presented paper is devoted to the application of Karhunen-Loève transform (KLT) for compression and to study of KLT impact on the image distortion in astronomy.
Petr Pata
doaj   +1 more source

Elasticity‐Driven Periodic Polarization Patterns in a Chiral Ferroelectric Nematic Fluid

Advanced Materials, EarlyView.
Chiral polar ferroelectric nematic fluids exhibit spontaneous formation of stripe, square, and hexagonal polarization textures under confinement. Controlled by thickness and anchoring, these patterns produce spatially modulated nonlinear optical responses.
Anej Sterle, Peter Medle Rupnik, Luka Cmok, Aitor Erkoreka, Marta Lavrič, Natan Osterman, Calum J. Gibb, Jordan Hobbs, Josu Martinez‐Perdiguero, Richard J. Mandle, Alenka Mertelj, Nerea Sebastián   +11 more
wiley   +1 more source

Research on Multiclassification Algorithm of Ultrawideband Pulsar RFI Based on MobileNetV2

The Astronomical Journal
Radio telescopes are susceptible to radio frequency interference (RFI) during observations, which introduces noise and artificial signals into astronomical data.
Wenna Cai, Hailong Zhang, Yazhou Zhang, Jie Wang, Xu Du, Ting Zhang, Yuyue Jiao, Hongmei Tang, Xinchen Ye, Wanqiong Wang, Jia Li   +10 more
doaj   +1 more source