Results 31 to 40 of about 1,251 (171)

Physical Origin of Temperature Induced Activation Energy Switching in Electrically Conductive Cement

Advanced Science, EarlyView.
The temperature‐induced Arrhenius activation energy switching phenomenon of electrical conduction in electrically conductive cement originates from structural degradation within the biphasic ionic‐electronic conduction architecture and shows percolation‐governed characteristics: pore network opening dominates the low‐percolation regime with downward ...
Jiacheng Zhang, Xinyuan Ke, Andrew Heath, Richard J. Ball, Jiawei Xie, Jinchen Fan, Guisheng Li, Kevin Paine   +7 more
wiley   +1 more source

Propagation Properties of Airy Beam through Periodic Slab System with Negative Index Materials

International Journal of Optics, 2018
Based on light transfer matrix and electric field vector equation, the evolution of Airy beam propagating in periodic slab system with three negative index materials (NIMs) and its transmission mechanism are investigated.
Long Jin, Xingqiang Zhang
doaj   +1 more source

Tamper Detection and Recovery for Medical Images Using Near-lossless Information Hiding Technique [PDF]

Journal of Digital Imaging, 2007
Digital medical images are very easy to be modified for illegal purposes. For example, microcalcification in mammography is an important diagnostic clue, and it can be wiped off intentionally for insurance purposes or added intentionally into a normal mammography.
Jeffery H. K. Wu, Ruey-Feng Chang, Chii-Jen Chen, Ching-Lin Wang, Ta-Hsun Kuo, Woo Kyung Moon, Dar-Ren Chen   +6 more
openaire   +3 more sources

Photonic Time Crystals and Time‐Varying Electromagnetic Metamatter: A New Direction for Ultrafast Tunable Photonic and Microwave Materials and Devices

Advanced Science, EarlyView.
Photonic time crystals (PTCs) are systems in which electromagnetic parameters are modulated periodically in time, producing momentum bandgaps via temporal scattering rather than spatial Bragg processes. This review examines the theoretical frameworks, modeling, and computational tools for time‐varying media, and summarizes experimental demonstrations ...
Ranjan Kumar Patel, Shriram Ramanathan, Ronald P. Jenkins, Michael J. Carter   +3 more
wiley   +1 more source

Progressive Secret Sharing with Adaptive Priority and Perfect Reconstruction

Journal of Imaging, 2021
A new technique for progressive visual secret sharing (PVSS) with adaptive priority weight is proposed in this paper. This approach employs the bitwise and eXclusive-OR (XOR) based approaches for generating a set of shared images from a single secret ...
Heri Prasetyo, Chih-Hsien Hsia, Alim Wicaksono Hari Prayuda   +2 more
doaj   +1 more source

Physics‐Aware Machine‐Learning‐Driven Inverse Design of Broadband Ultra‐Open Acoustic Metamaterials

Advanced Science, EarlyView.
A physics‐aware machine‐learning framework enables inverse design of ultra‐open acoustic silencers by decoupling spectral and radial design spaces. The approach rapidly identifies broadband, compact, and highly ventilated architectures, while revealing hidden linear design rules that link geometry, impedance matching, and acoustic performance.
Zhiwei Yang, Mengyu Li, Xiaohang Xie, Ao Chen, Thomas G. Bifano, Xin Zhang   +5 more
wiley   +1 more source

Pixel shift-based reversible steganography for privacy-preserving medical images

Frontiers in Medicine
Steganography plays a critical role in preserving the privacy of medical images by protecting sensitive patient information without compromising image quality or diagnostic utility.
Xiaofeng Huang, Bing Zhang, Xishun Zhu
doaj   +1 more source

Suitability of Electrical Coupling in Solar Cell Thermoelectric Hybridization

Designs, 2018
It is well known that the major constraints to the efficiency of photovoltaic devices come from the generation of heat. In this context, thermoelectric generators have been proposed as a viable heat recovery solution, leading to an increase of the ...
Bruno Lorenzi, Maurizio Acciarri, Dario Narducci   +2 more
doaj   +1 more source

Updatable Closed‐Form Evaluation of Arbitrarily Complex Multiport Network Connections

Advanced Electronic Materials, EarlyView.
The inverse design of electrically large wave devices often uses reduced‐order multiport models with discrete optimization, requiring many evaluations of complex interconnections between subsystems that differ only in a few blocks. This paper introduces a closed‐form framework enabling efficient Woodbury low‐rank updates of related, previous ...
Hugo Prod'homme, Philipp del Hougne
wiley   +1 more source

IMPLEMENTASI ALGORITMA END OF FILE (EoF) PADA STEGANOGRAFI CITRA

Jurnal Teknoif Teknik Informatika Institut Teknologi Padang, 2020
Dalam menjaga kerahasiaan informasi atau data dari sabotase, pencuri atau dari pihak yang tidak berwenang, dapat dilakukan dengan menyembunyikan pesan pada sebuah media yang dikenal dengan steganografi.
Minarni, Andre Gesta Fernando
doaj   +1 more source