Results 161 to 170 of about 426 (207)

Modeling proppant transport and settling in a 3D propagating fracture

Deep Underground Science and Engineering, EarlyView.
A versatile multiphysics tool is presented for simulating the complex processes involved in hydraulic fracturing treatments. The model couples fracture opening and propagation, variable‐density slurry flow, and proppant particle transport within the multiphysics object‐oriented simulation environment framework, based on two‐phase mixture equations and ...
Robert Egert, Aimé Fournier, Wencheng Jin   +2 more
wiley   +1 more source

Synergistic Microstructure and Dielectric Engineering of Recyclable Single‐Electrode Triboelectric Nanogenerators for Sustainable Smart Homes

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A recyclable triboelectric nanogenerator integrating a pseudo‐honeycomb microstructure with liquid metal doping achieves 120% higher output (122 mW m−2) and >90% retention over seven cycles, enabling self‐powered smart home functions. The performance of single‐electrode triboelectric nanogenerators (SE‐TENGs) is governed by the effective contact area ...
Chencheng Hu, Yuehan Pei, Wenbo Hu, Yu Qi, Ruida Cao, Long Yang, Zitong Kan, Yang Lu, Biao Dong, Hongwei Song, Lin Xu   +10 more
wiley   +1 more source

High‐Performance Wearable Triboelectric Nanogenerators Based on Polyethyleneimine‐Doped Cellulose Acetate for Self‐Powered Dynamic Signature Sensing and Verification

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A high‐performance wearable triboelectric nanogenerator (TENG) based on polyethyleneimine ‐doped cellulose acetate is demonstrated for dynamic signature authentication. The developed TENG with enhanced interfacial polarization and increased surface charge density exhibits excellent mechanical durability, environmental stability, and long‐term ...
Yoon‐Seo Choi, Han‐Bi Kang, Chae‐Eun Kim, Tae‐Jun Ha   +3 more
wiley   +1 more source

A Flexible Poling‐Free Piezoelectric Energy Harvester Based on Gradient Ti‐Doped BiFeO3 Films

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A self‐aligned polarization is realized in compositional gradient Ti‐doped BiFeO3 films via the formation of defect dipoles and strain gradient. The self‐poling behavior is robust to resist high electric field and elevated temperature. The fabricated poling‐free piezoelectric energy harvester delivers output comparable to the poled ones.
Wentao Yang, Panpan Lv, Guiyun Gao, Shuzhi Zhang, Hang Zhan, Cuncheng Li, Luchao Ren, Jin Qian, Mingwei Zhang   +8 more
wiley   +1 more source

Towards Transformative Climate Governance: Capacities and Constraints for Local Government in Aotearoa New Zealand

Environmental Policy and Governance, EarlyView.
ABSTRACT An emerging consensus calls for transformative climate governance. However, what instigates and sustains transformative pathways remains unclear. This study characterises the existence, quality and structural underpinnings of transformative governance capacities in local government climate change response in Aotearoa New Zealand, applying a ...
Gangadari K. Ranawaka, Anna L. Berka, Karen F. Hytten, Florentine D. van Noppen   +3 more
wiley   +1 more source

Retro‐Hetero‐Michael Addition Strategies in Organic Synthesis

European Journal of Organic Chemistry, EarlyView.
In this review, synthetic approaches to carbo‐ and heterocyclic compounds, including natural products, published in the last 15 years (2011–2025) which have either relied upon or included a retro‐hetero‐Michael addition step at any stage are discussed.
Dina Scarpi, Ernesto G. Occhiato
wiley   +1 more source

Policy Networks and Policy Entrepreneurship in the EU: Explaining Structural Policy Change in Pharmaceutical Innovation Incentives and Health Technology Assessment

European Policy Analysis, EarlyView.
ABSTRACT Policy process research has excelled in explaining structural policy change within national settings, but extensions and applications to the EU level have long proven challenging for scholars. Given that the EU is currently experiencing its longest period of Treaty stability since the 1980s—having evolved into a sui generis political system ...
Vassilis Karokis‐Mavrikos
wiley   +1 more source

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Investigation on Impact Hammer Testing with Different Types of Hammer Tip for Welded Thin Plate

Advanced Science Letters, 2017
Modal testing using impact hammer had been used extensively in various industries to analyze the dynamic properties of the structure. Impact testing become famous due to their advantages for instances; fast, compatible for measurements in the field and relatively inexpensive.
Mohd Shahrir Mohd Sani, Sani M S M
exaly   +2 more sources

Impact test hammer

The Journal of the Acoustical Society of America, 1992
An impact test hammer includes a cylindrical handle having opposite first and second end portions and a hollow interior, a sensor portion fixed to the first end portion of the handle, and a grip portion fixed to the second end portion of the handle. An elastic striking portion is fixed to an outer periphery of the sensor storage portion, and an impact ...
Kiyoshi Umemura, Teruo Irie
openaire   +1 more source

Modal testing on a limited budget: Analysis of instrumented hammer alternatives for impact testing

The Journal of the Acoustical Society of America, 2023
In recent years, as the use of numerical modeling has increased, organizations have frequently scaled back their experimental capabilities. Often equipment and expertise are no longer available when modal correlation measurements are required. This presentation is part of a planned series examining a minimalist approach to modal testing.
Hubert S. Hall, Curtis Larsen
openaire   +1 more source