Results 221 to 230 of about 215,222 (264)

The chemistry of the mechanical bond

Chemical Society Reviews, 2009
The use of templation in the synthesis of unnatural products where two or more components are mechanically interlocked has not only raised the efficiency of their production to near quantitative levels in some instances, but the molecular recognition that aids and abets the templation is also part and parcel of the molecules after they have been ...
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Mechanism of Ribosomal Peptide Bond Formation

Science, 2001
The mechanism of peptide bond synthesis constitutes a fundamental and long-debated question in molecular biology. For many years, ribosomologists championed a protein-based mechanism, similar to the charge relay system that has been proposed for peptide hydrolysis by serine proteinases ...
Dorner, Silke, Polacek, Norbert, Barta, Andrea   +2 more
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The Mechanism of Covalent Bonding

Journal of Chemical Education, 1997
Covalent bonding is the natural consequence of the electron delocalization that occurs when two or more atoms form a stable molecule by the process of electron sharing. In an effort to present an easily accessible physical picture, covalent bonding is often described in terms of simple (but incorrect) electrostatic models that effectively ignore the ...
George B. Bacskay, Jeffrey R. Reimers, Sture Nordholm   +2 more
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The Mechanical Bond: A Work of Art

2011
Mechanically interlocked objects are ubiquitous in our world. They can be spotted on almost every scale of matter and in virtually every sector of society, spanning cultural, temporal, and physical boundaries the world over. From art to machinery, to biological entities and chemical compounds, mechanical interlocking is being used and admired every day,
Carson J, Bruns, J Fraser, Stoddart
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Bonding mechanisms in tabletting

International Journal of Pharmaceutics, 1990
Abstract An investigation has been undertaken to ascertain the role of Van der Waals forces in the formation of tablets. Hamaker constants have been estimated from surface free energy measurements on polymers and materials of pharmaceutical interest.
M LUANGTANAANAN, J FELL
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A Bond Failure Mechanism

24th International Reliability Physics Symposium, 1986
Intermittent continuity failures of P-DIP parts were found to be the result of wire bond failures induced by stresses associated with the assembly process. The bond failures were characterized by cracking of the underlying pad structure. It was found that silicon nodule precipitates from the aluminum metallization in the pad acted as points of high ...
Tim Koch, Wayne Richliug, John Whitlock, Dave Hall   +3 more
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Theory of Adhesion, Mechanism of Bond Failure, and Mechanism for Bond Improvement

Rubber Chemistry and Technology, 1970
Abstract The various theories of adhesion are discussed, with mention of some aspects that are inconsistent with recent bonding developments. A mechanism for adhesive failure is proposed on the basis of thermodynamics and experimental phenomena.
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A mechanism of explosive bonding

Metallurgical Transactions, 1971
An aero-hydrodynamic analogy is used to construct a description of the formation of wavy interfaces during explosive bonding. A von Karman vortex street in the wake of the reentrant jet formed at the collision point of the parent and flyer plates yields the required interface structure.
James F. Kowalick, D. Robert Hay
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Mechanically Interlocked Polymers with Dense Mechanical Bonds

Accounts of Chemical Research
ConspectusMechanically interlocked polymers (MIPs) such as polyrotaxanes and polycatenanes are polymer architectures that incorporate mechanical bonds, which represent a compelling frontier in polymer science. MIPs with cross-linked structures are known as mechanically interlocked networks (MINs) and are widely utilized in materials science. Leveraging
Zhaoming Zhang, Jun Zhao, Xuzhou Yan
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Mechanics of bonds in an FRP bonded concrete beam

Composites Part B: Engineering, 2001
Abstract Fibre-reinforced plastic (FRP) materials have been recognised as new innovative materials for concrete rehabilitation and retrofit. Since concrete is poor in tension, a beam without any form of reinforcement will fail when subjected to a relatively small tensile load.
Lau, K.T., Dutta, P.K., Zhou, L.M., Hui, D.   +3 more
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