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Universal Roughness and the Dynamics of Urban Expansion

: Urban sprawl reshapes cities, yet its quantitative laws remain elusive. Analyzing built-up expansion in 19 cities (1985-2015) with tools from surface growth physics in radial geometry, we reveal anisotropic, branchlike growth and a piecewise linear scaling between area and population. We uncover a robust local roughness exponent α_{loc}≈0.54, coexisting with variable β and z. This unusual coexistence of universal and variable exponents offers a rare empirical test bed for nonequilibrium gro...

Aspect Ratio‐Engineered Ru‐Integrated W18O49: Controlled Growth and Enhanced Electrocatalytic Activity

The sustainable production of renewable fuels and feedstocks is currently constrained by the slow kinetics of anodic oxygen evolution reaction (OER). Precious metal-based catalysts such as Ir suffer from stability issues as well as high capital cost. To enforce the future of green hydrogen production, this study develops Ru-integrated W18O49 nanowires (NWs), as an efficient and stable OER electrocatalyst. This study obtains Ru-W18O49 NWs by a combined physical vapor deposition–chemical vapor ...

Programmable Functional Connectivity and Synchronous Activity in Resistive Switching Self‐Assembled Nanostructured Networks

The efficiency of biological data processing systems is based on their adaptive connectivity and on the mutual interactions of their elements at different scales. These features are not substantially present in the design of electronic architectures based on conventional integrated circuits. The exploitation of self-assembled systems characterized by nonlinear dynamics is actively investigated as a viable alternative strategy to develop energy-efficient data processing devices. However, the e...

Physicochemical and Antimicrobial Evaluation of Bacterial Cellulose Derived from Spent Tea Waste

Bacterial cellulose (BC) is a high-purity biopolymer with excellent physicochemical and mechanical properties, including high crystallinity, water absorption, biocompatibility, and structural tunability. However, its large-scale production is hindered by high substrate costs and limited sustainability. In this study, spent black tea waste was utilized as a low-cost and eco-friendly carbon source for BC synthesis by Komagataeibacter xylinus ATCC 53524 under varying initial pH conditions (4–9)....

A Review on Trustworthiness of Digital Assistants for Personal Healthcare

Artificial Intelligence (AI) is widely used within the healthcare domain. One of the branches of digital health concerns the design and development of digital assistant solutions. AI-enabled digital assistants highlight the need to be trustworthy given their intrusiveness within people’s lives. Such solutions aim to provide intelligent tools to ease the management of care pathways or to enhance the capabilities of healthcare organizations in deploying health prevention campaigns by monitoring...

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