Results 291 to 300 of about 355,905 (327)

Spring constants of capsular tension rings

Journal of Cataract and Refractive Surgery, 2004
To determine the spring constants of several types of capsular tension rings (CTRs).Department of Ophthalmology, Johannes Gutenberg-University, Mainz, Germany.Fourteen models of CTRs provided by 9 companies were tested; all were 11.0 mm in diameter.
Sabine, Kurz, H Burkhard, Dick
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On constant Armendariz rings

Asian-European Journal of Mathematics, 2016
Let [Formula: see text] be a ring equipped with an endomorphism [Formula: see text] and an [Formula: see text]-derivation [Formula: see text]. In this article, we study [Formula: see text]-constant Armendariz rings and radicals of the Ore extension [Formula: see text], in terms of a [Formula: see text]-constant Armendariz ring [Formula: see text] with
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CONSTANTS OF DERIVATIONS OF PRIME RINGS

Mathematics of the USSR-Izvestiya, 1982
A Galois correspondence theorem is proved for any finite-dimensional Lie -algebra of outer derivations of a prime ring of positive characteristic. A theorem is proved on the existence of a locally finite ideal, in the sense of Sirsov, over the ring of constants of such a Lie -algebra. Extension and rigidity theorems are also obtained.
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Rings of Eventually Constant Sequences

Journal of Mathematical Sciences, 2003
All rings are assumed to be associative and to have non-zero identity elements. Throughout \(A\) is a ring with Jacobson radical \(J(A)\), \(B\) is a unitary subring in \(A\), \(\{A_i\}_{i=1}^\infty\) is a countable set of copies of \(A\), \(D\) is the direct product of all the rings \(A_i\), \(B'\) is the subring \(\{(b,b,\dots)\mid b\in B\}\) of \(D\)
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SHUFFLE-RING: A NEW CONSTANT-DEGREE NETWORK

International Journal of Foundations of Computer Science, 1998
The hypercube as a parallel interconnection network has been of academic and engineering concern for tens of year due to its many merits. However, its increasing node degree is an obvious weakness. Some networks such as the cube-connected cycles (CCC) and the de Bruijn network have been proposed to overcome the increasing degree of the hypercube.
Chen, Guihai, Lau, Francis C. M.
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On the Graded Ring of Theta-Constants

American Journal of Mathematics, 1964
Introduction. Let g be a positive integer and let T be a complex symmetric matrix of degree g with a positive-definite imaginary part. The set of such matrices forms a convex open subset of the 1 * g (g + 1) -dimensional complex vector space and (as a complex manifold) it is called the Siegel upper-half plane of degree (or "genus") g.
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Numerical estimates for a Grötzsch ring constant

Constructive Approximation, 1988
The paper studies the behavior of the modulus \(M_ n(a)\) of the Grötzsch extremal ring \(R_{G,n}(a)\subset {\mathfrak R}^ n\) as a tends to 0. In the first two parts lower and upper estimates are obtained for \[ \lim_{a\to 0}(M_ n(a)+\log a). \] The lower estimates are given in terms of n; the upper estimates are obtained numerically for \(3\leq n\leq
Anderson, G. D., Frame, J. S.
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The sharp constant in the ring lemma

Complex Variables, Theory and Application: An International Journal, 1997
In his paper [2] Lowell J. Hansen found a (nonlinear) recurrence formula for the (sharp constant appearing in the “Ring Lemma” of Rodin and Sullivan [3]. In the following we improve Hansen's result and replace his recurrence relation by a linear recurrence formula leading to a closed formula for the Ring Lemma constant.
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Practical Constant-Size Ring Signature

Journal of Computer Science and Technology, 2018
Bitcoin has gained its popularity for almost 10 years as a “secure and anonymous digital currency”. However, according to several recent researches, we know that it can only provide pseudonymity rather than real anonymity, and privacy has been one of the main concerns in the system similar to Bitcoin. Ring signature is a good method for those users who
Meng-Jun Qin, Yun-Lei Zhao, Zhou-Jun Ma
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Constant Volume Ring Shear Apparatus

Geotechnical Testing Journal, 1996
Abstract The paper describes a constant volume ring shear apparatus that allows the measurement of the undrained peak and residual shear strengths of cohesive soils. The undrained peak and residual strengths are applicable to seismic stability evaluations of slopes comprised of or founded on cohesive soil.
TD Stark, IA Contreras
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