Parity-locking effect in a strongly-correlated ring

Orbital magnetism in an integrable model of a multichannel ring with long-ranged electron-electron interactions is investigated. In a noninteracting multichannel system, the response to an external magnetic flux is the sum of many diamagnetic and paramagnetic contributions, but we find that for sufficiently strong correlations, the contributions of all channels add constructively, leading to a parity (diamagnetic or paramagnetic) which depends only on the total number of electrons. Numerical results confirm that this parity-locking effect is robust with respect to subband mixing due to disorder.Comment: part of lecture presented in the conference ``Unconventional quantum liquids", appearing in Z. Phy

Some determinants of organizational success

Organizational efficiency and productivity determined by variables associated with economics, psychology, and sociolog

Acceptance checkout equipment - Spacecraft Monthly progress report, 15 Jan. - 15 Feb. 1966

Acceptance checkout equipment and spacecraft testin

The Child as a Witness

Most parents will agree that small children have an uncanny ability of being in strange places at unexpected moments. Children are often in the right place at the right time to see people, things and events that are never witnessed by adults. As we know from experience, they often overhear things that adults have felt were said in confidence or were said because they felt there were no witnesses. While this faculty is often a mere source of annoyance to the adult members of the family, it may have considerable impact upon the outcome of some legal action. Unfortunately, the child\u27s tendency to wander also places him in out-of-the-way places where he may have crimes committed against his person. As a result, the child may be the only witness available to the state in prosecuting a crime. The prosecuting attorney will then be faced with the difficult task of establishing that child\u27s competency as a witness. For all practical purposes, it will be necessary to determine whether his testimony will enhance or stay the cause of justice

The Internet as a Meta-Medium: Emerging Uses of the World Wide Web A Tutorial

The Internet is currently conceptualized as a network of information systems, and is intended to deliver and receive primarily computer services. The evolution of the network, however, promises to soon provide not only information but also broadband entertainment and integrated communication services, as strongly implied by the recent AOL/Time Warner merger. The question is whether the Internet is poised to supplant traditional media such as radio, telephone and television, or whether it will simply supplement these entertainment channels. The purpose of this tutorial is to bring together key members of industry and academe to engage the audience in a discussion of the emerging developments in convergent multimedia suggested by AOL\u27s recent merger activity. Dennis Gonier, Senior Vice President of America OnLine, and George Shirk, Editor of Wired News at HotWired, will represent the views of the Internet industry, while noted systems theorists and multimedia researchers Jim Courtney and Janna Poora will represent the academic view on multimedia convergence

Letter from Harry F. Stafford to John Muir, 1914 Mar 18.

[letterhead]March 18, 1914.Mr. John Muir,Muir Station, Cal.My dear Mr. Muir:I wish to let you know that I have just read your book, The Story of my Boyhood and Youth , and that it is one of the most interesting and instructive books I have ever read. And I hope you are going to write about your later experiences. I certainly would like very much to read about them.I am Morgan H. Stafford\u27s older and deaf brother. When he was in California, he wrote about meeting you and how interesting he found you.Thanking you for the pleasure your book has given me, I amVery sincerely yoursHarry L. Stafford0572

Evaluating Performance and Efficiency of a 16-bit Substitution Box on an FPGA

A Substitution Box (S-Box) is an integral component of modern block ciphers that provides confusion. The term confusion was introduced by Shannon in 1949 and it refers to the complexity of the relationship between the key and the ciphertext. Most S-Boxes are non-linear in order to promote confusion. Due to this, the S-Box is usually the most complex component of a block cipher. The Advanced Encryption Standard (AES) features an 8-bit S-Box where the output depends on the Galois field multiplicative inverse of the input. MK-3 is a sponge based Authenticated Encryption (AE) algorithm which provides both authenticity and confidentiality. It was developed through a joint effort between the Rochester Institute of Technology and the former Harris Corporation, now L3Harris. The MK-3 algorithm has a state that is 512 bits wide and it uses 32 instances of a 16-bit S-Box to cover the entire state. These 16-bit S-Boxes are similar to what is seen in the AES, however, they are notably larger and more complex. Binary Galois field arithmetic is well suited to hardware implementations where addition and multiplication are mapped to a combination of basic XOR and AND operations. A simple method to calculate Galois field multiplicative inversion is through the extended Euclidean algorithm. This is, however, very expensive to implement in hardware. A possible solution is to use a composite field representation, where the original operation is broken down to a series of simpler operations in the base field. This lends itself very well to implementations that consume less area and power with better performance. Given the size and number of the S-Boxes in MK-3, these units contribute to the majority of the implementation resources. Several composite field structures are explored in this work which provide different area utilization and clock frequency characteristics. This thesis evaluates the composite field structures and recommends several candidates for high performing MK-3 Field Programmable Gate Array (FPGA) applications