In most cases beam is injected into electron storage rings in the horizontal plane and off-axis. The larger the horizontal emittance of the injected beam the larger the acceptance of the ring has to be. The injected beam is usually delivered by a synchrotron. In case the vertical acceptance of the ring is sufficiently large one can take advantage of the small vertical emittance reached in well ...

Abstract: We present an overview of the IEEE 802.17 Resilient Packet Ring (RPR) protocol standard for metropolitan area networks. We discuss the main characteristics of the protocol and the main drivers for its development. We outline various aspects of the protocol: architecture and operation principles, physical layer, packet formats, the MAC protocol and its fairness, protection switching an...

The application of a 32P-postlabeling assay for 7-methylguanines in DNA was studied either by labeling the imidazole ring-opened dinucleotide derivatives or by using strong-anion-exchange column chromatography for the adduct enrichment from normal nucleotides. Data showed that 7-methylguanines can be efficiently labeled as dinucleotides when in vitro methylated DNA was first imidazole ring-open...

We propose a new post-quantum key exchange algorithm based on the module learning with errors (mLWE) problem. Our ThreeBears algorithm is simple and performant, but our main goal is to suggest mLWE over a generalized Mersenne field instead of a polynomial ring. We also show how to build a public-key encryption system from the key exchange algorithm.

In this paper we present a key exchange protocol based on multivariate noncommutative polynomial rings, analogous to the classic Diffie-Hellman method. Our technique extends the proposed scheme of Boucher et al. from 2010. Their method was broken by Dubois and Kammerer in 2011, who exploited the Euclidean domain structure of the chosen ring. However, our proposal is immune against such attacks,...

Due to the growing importance in the fields of computer networks, how to keep user’s privacy has drawn more and more concerns in recent years. In this paper, based on a ring signature scheme, we propose a new secure anonymous authenticated key exchange protocol, which inherits all the good virtues of the previous protocols. Furthermore, we discuss the security attributes of our new scheme. Fina...

The effects of the ring-exchange Hamiltonian H3 = J3 ∑ 〈ijk〉(Si · Sj)(Si · Sk) on the triangular lattice are studied using classical Monte Carlo simulations. Each spin Si is treated as a classical XY spin taking on Q equally spaced angles (Q-states clock model). For Q = 6, a first-order transition into a stripe-ordered phase preempts the macroscopic classical degeneracy. For Q > 6, a finite win...

Ryan V. Mishmash,1 Matthew S. Block,1,2 Ribhu K. Kaul,2 D. N. Sheng,3 Olexei I. Motrunich,4 and Matthew P. A. Fisher1 1Department of Physics, University of California, Santa Barbara, California 93106, USA 2Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506, USA 3Department of Physics and Astronomy, California State University, Northridge, California 91330, US...

Background and Objective:Tubal sterilization is the most popular method of permanent female contraception, yet there is considerable debate concerning the influence of this procedure on the women’s health and menstrual pattern.  Methods:We randomized 1358 women to one of the five methods of tubal sterilization; unipolar electrocauterization, bipolar electrocauterization, minilaparatomy, Pomeroy...

Ring canals connecting Drosophila germline, follicle and imaginal disc cells provide direct contact of cytoplasm between cells. To date, little is known about the formation, structure, or function of the somatic ring canals present in follicle and imaginal disc cells. Here, we show by confocal and electron microscopy that Pavarotti kinesin-like protein and Visgun are stable components of somati...