Results 51 to 60 of about 145,655 (304)

Prediction of the Physical Properties of a Structural Member by the Impact Hammer Test

Sensors, 2022
The frequency response function (FRF) in the frequency domain is a black box used to collect physical information and to indicate the modal characteristics of a dynamic system. Analyzing the collected FRF data through the impact hammer test, dynamic parameters, such as stiffness, mass, and the damping matrix, can be estimated.
Eun-Taik Lee, Yu-Sik Hong, Hee-Chang Eun
openaire   +3 more sources

Exploiting Two‐Photon Lithography, Deposition, and Processing to Realize Complex 3D Magnetic Nanostructures

Advanced Functional Materials, EarlyView.
Two‐photon lithography (TPL) enables 3D magnetic nanostructures with unmatched freedom in geometry and material choice. Advances in voxel control, deposition, and functionalization open pathways to artificial spin ices, racetracks, microrobots, and a number of additional technological applications.
Joseph Askey, Arjen van den Berg, Sandra Ruiz Gomez, Claire Donnelly, Dirk Grundler, Sam Ladak   +5 more
wiley   +1 more source

Strength Properties of Various Types of Fiber-Reinforced Concrete for Production of Driven Piles

Buildings, 2023
This paper presents the results of static and dynamic tests of fiber-reinforced and unreinforced concrete samples under laboratory conditions. Concrete samples reinforced with steel and non steel fibers were tested.
Bekbasarov Isabai, Shanshabayev Nurzhan, Atenov Yerlan   +2 more
doaj   +1 more source

Aspects of energy requirements for rock drilling [PDF]

, 1974
Development of laboratory rock breakage techniques to relate energy and surface area produced by slow compression, drop hammer and stamp mill. A detailed study of laboratory rotary-percussive drilling in a wide range of rocks under different ...
Wootton, David
core  

National Estimates of Missing Children: Selected Trends, 1988-1999. [PDF]

, 2004
Presents results of an analysis comparing selected findings from the second National Incidence Studies of Missing, Abducted, Runaway, and Thrownaway Children (NISMART–2) and its predecessor, NISMART–1. The analysis, which is based on household surveys of
Finkelhor, David, Hammer, Heather, Porcellini, Lorraine E, Sedlack, Andrea J   +3 more
core   +2 more sources

Damage Detection in Steel–Concrete Composite Structures by Impact Hammer Modal Testing and Experimental Validation

Sensors, 2022
Steel–concrete composite systems are an efficient alternative to mid- and high-rise building structures because of their high strength-to-weight ratio when compared to traditional concrete or steel constructive systems. Nevertheless, composite structural systems are susceptible to damage due to, for example, deficient construction processes, errors in ...
Viviana Meruane, Sergio J. Yanez, Leonel Quinteros, Erick I. Saavedra Flores   +3 more
openaire   +5 more sources

Hydrogen‐Bond‐Rich Supramolecular Multiblock Copolymers Facilitate Rapid Zn2+ Migration in Quasi‐Solid‐State Zinc‐Ion Batteries

Advanced Functional Materials, EarlyView.
The disordered growth of dendrites, corrosion, parasitic side reactions, slow de‐solvation kinetics, and inherent safety risks significantly hinder the practical deployment of conventional liquid electrolyte zinc‐ion batteries. In contrast, the novel PU‐EG+DMPA‐Zn polyurethane quasi‐solid‐state electrolyte, enriched with abundant polar functional ...
Ruiqi Liu, Changding Wang, Fu Wan, Kaida Hu, Da Yang, Yaoyang Xia, Wenwei Yin, Yupeng Lin, Yuejiao Chen, Shuhui Sun, Weigen Chen   +10 more
wiley   +1 more source

A Biologically‐Architected Wear and Damage‐Resistant Nanoparticle Coating From the Radular Teeth of Cryptochiton stelleri

Advanced Functional Materials, EarlyView.
The ultrahard teeth of mollusks that feed on rocky substrates contain a wear‐resistant coating on their surfaces consisting of densely packed mesocrystalline magnetic nanoparticles within an organic matrix. These coatings display significant hardness and toughness through their highly controlled mesocrystalline architectures.
Taifeng Wang, Yu Chen, Ezra Sarmiento, Taige Hao, Atsushi Arakaki, Michiko Nemoto, Pablo Zavattieri, David Kisailus   +7 more
wiley   +1 more source

Experimental investigation of energy consumption performance in enhanced foam-concrete sandwich slabs

Case Studies in Construction Materials
This study focuses on rockfall impact damage to roof slabs and tunnel shed slabs and adopts the design principles of bulletproof composite armor to develop energy dissipation buffer structures.
Liang Gao, Ziyan Pan, Kun Wang, Junfa Zhang   +3 more
doaj   +1 more source

Sound propagation through bone tissue [PDF]

, 2015
Effect of perforation on structure borne sound propagation through rigid porous materials has been investigated. Experimental works has been carried out on rigid porous materials with and without perforations.
Aygun, Haydar
core