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Use of a Prismatic Binocular for Viewing Near Objects (1920)

BARKER, D. WILSON

[s.l.] : Nature Publishing Group

Nature 104 (1920), S. 532-532

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] A FEW years ago, with a view to the observation of close objects out of doors, I procured some glass adapter lenses for use on the object glass of the half of a prism binocular (× 12) which I carried about with me. Finding, however, that this method involved the use of several glass adapters, ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/104532e0

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Further studies on dynamic crack branching (1983)

Ramulu, M. ; Kobayashi, A. S. ; Kang, B. S. J. ; [et al.]

Springer

Experimental mechanics 23 (1983), S. 431-437

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ISSN: 1741-2765

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Abstract The newly derived dynamic-crack-branching criterion with its modifications is verified by the dynamicphotoelastic results of dynamic crack branchings in thinpolycarbonate, single-edged crack-tension specimens. Successful crack branching was observed in four specimens and unsuccessful branching in another. Crack branching consistently occurred when the necessary conditions ofK I =K I b =3.3 MPa $$\sqrt m$$ and the sufficiency condition ofr o =r c =0.75 mm were satisfied simultaneously. In the unsuccessful branching test, the necessary condition was not satisfied sinceK I was always less thanK I b .