Expansion effects shown by some pyrex glasses
نویسندگان
چکیده
منابع مشابه
Evaluation of Pyrex Glasses by the Line-Focus-Beam Ultrasonic Material Characterization System
The line-focus-beam ultrasonic material characterization (LFB-UMC) system is applied to evaluation of commercial Pyrex glasses (C-7740, Corning Inc.). Twenty-eight specimens were prepared at random from different lots. Velocities of leaky surface acoustic waves (LSAWs), VLSAW, were measured at 225 MHz around 23°C. VLSAW was 3121.85-3149.83 m/s. To understand the velocity variations, bulk acoust...
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A detailed study of the wavelength dependence of the formation of lenslets by photo-expansion in chalcogenide glasses is reported. Photo-expansion in chalcogenide glasses offers a one-step fabrication process to record surface structures such as gratings and microlenses. The process is purely optical and requires no fixing and etching to get the desired surface structure. Two competing effects,...
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PURPOSE To describe the use of a new, frosted Jones Pyrex tube in the treatment of obstructed canaliculi of the upper lacrimal system. The frosted Jones tube retains the advantages of the traditional smooth Pyrex tube yet appears to improve the positional stability in the surgically created fistula. METHODS Ten patients of a single surgeon who had previously undergone external conjunctivodacr...
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The proportion of Europeans descending from Neolithic farmers ∼ 10 thousand years ago (KYA) or Palaeolithic hunter-gatherers has been much debated. The male-specific region of the Y chromosome (MSY) has been widely applied to this question, but unbiased estimates of diversity and time depth have been lacking. Here we show that European patrilineages underwent a recent continent-wide expansion. ...
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The renormalization-group recursion relations obtained by Chen and Lubensky for the multicritical point associated with simultaneous critical fluctuations in both the spin-glass and ferromagnetic order are reanalyzed. To first order in ε==6-d we find that the multicritical fixed point is located inside the Nishimori manifold and that the scaling axes agree with those obtained recently from gene...
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ژورنال
عنوان ژورنال: Journal of Research of the National Bureau of Standards
سال: 1948
ISSN: 0091-0635
DOI: 10.6028/jres.040.043